CN112824919A - Method, device and equipment for determining thermal runaway alarm threshold of battery - Google Patents

Disclosure of Invention

The embodiment of the disclosure provides a method, a device and equipment for determining a thermal runaway alarm threshold of a battery, and aims to solve the problem that a thermal runaway alarm signal cannot be timely and reliably sent out due to inaccurate thermal runaway alarm threshold used in the prior art.

In a first aspect, an embodiment of the present disclosure provides a method for determining a thermal runaway alarm threshold of a battery, where the method includes:

detecting the cell characteristic parameters when the heat is out of control in a plurality of test scenes to obtain a parameter value group; the parameter value set comprises cell characteristic parameter values of the cell characteristic parameters when thermal runaway occurs in each test scene;

and determining a thermal runaway alarm threshold of the battery core characteristic parameters according to the parameter value set.

In some embodiments, determining the thermal runaway alarm threshold for the cell characteristic parameter according to the parameter value set includes:

screening one electric core characteristic parameter value in the parameter value groups as a reference value of the electric core characteristic parameter according to a screening rule matched with the electric core characteristic parameter;

and determining a thermal runaway alarm threshold of the electrical core characteristic parameter according to the reference value of the electrical core characteristic parameter.

In some embodiments, the screening, according to a screening rule matching the cell characteristic parameter, one of the parameter value sets as a reference value of the cell characteristic parameter includes:

and screening the parameter value set under the condition that the electrical core characteristic parameter is the electrical core temperature, the electrical core voltage or the electrical core temperature rise slope, wherein the electrical core characteristic parameter value with the minimum value is used as the reference value of the electrical core characteristic parameter.

In some embodiments, after determining the thermal runaway alarm threshold for the cell characteristic parameter according to the parameter value set, the method further includes:

transmitting thermal runaway configuration information to the vehicle;

the thermal runaway configuration information is used for indicating the vehicle to output a thermal runaway alarm signal under the condition that a preset condition is met, wherein the preset condition is associated with a thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the number of the cell characteristic parameters is at least three, and the at least three cell characteristic parameters include a cell temperature, a cell voltage, and a cell temperature rise slope;

the preset condition comprises at least one of the following conditions:

the temperature value of the battery core is greater than the thermal runaway alarm threshold of the battery core temperature, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core;

the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold value of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold value of the voltage of the battery core;

the temperature value of the battery core is larger than the thermal runaway alarm threshold value of the battery core temperature, and the voltage acquisition of the battery core is invalid;

the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the time length when the cell current value is greater than or equal to the preset time length.

In some embodiments, the plurality of test scenarios comprises at least one of:

a test scenario of a cell level;

a test scenario of a battery module level;

a battery system level test scenario.

In some embodiments of the present invention, the,

the cell level test scenario includes at least one of: a battery cell short circuit test scene and a battery cell overcharge test scene;

the test scenario of the battery module level comprises at least one of the following: heating a test scene by the battery module and needling the test scene by the battery module;

the battery system level test scenario includes at least one of: the method comprises the following steps of a battery system overcharge test scene, a battery system immersion test scene, a battery system ball impact test scene and a battery system high-voltage loop electric connection back-twist test scene.

In some embodiments, after determining the thermal runaway alarm threshold for the cell characteristic parameter, the method further includes:

under a calibration scene, acquiring a cell characteristic parameter value of the cell characteristic parameter when thermal runaway occurs;

and verifying the thermal runaway alarm threshold of the electrical core characteristic parameter according to the obtained relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the verifying the thermal runaway alarm threshold of the electrical core characteristic parameter according to the obtained magnitude relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter includes:

under the condition that the characteristic parameter of the battery core is the temperature of the battery core, the voltage of the battery core or the temperature rise slope of the battery core, if the obtained characteristic parameter value of the battery core is larger than the thermal runaway alarm threshold value of the characteristic parameter of the battery core, determining that the thermal runaway alarm threshold value of the characteristic parameter of the battery core passes the verification; otherwise, determining that the verification of the thermal runaway alarm threshold of the electrical core characteristic parameter is not passed.

In a second aspect, embodiments of the present disclosure provide an apparatus for determining a thermal runaway alarm threshold of a battery, the apparatus comprising:

the first obtaining module is used for detecting the cell characteristic parameters when the heat is out of control in a plurality of test scenes so as to obtain a parameter value group; the parameter value set comprises cell characteristic parameter values of the cell characteristic parameters when thermal runaway occurs in each test scene;

and the determining module is used for determining the thermal runaway alarm threshold of the battery core characteristic parameter according to the parameter value group.

In some embodiments, the determining module comprises:

the screening submodule is used for screening one electric core characteristic parameter value in the parameter value groups as a reference value of the electric core characteristic parameter according to a screening rule matched with the electric core characteristic parameter;

and the determining submodule is used for determining a thermal runaway alarm threshold of the electrical core characteristic parameter according to the reference value of the electrical core characteristic parameter.

In some embodiments, the screening submodule is specifically configured to:

and screening the parameter value set under the condition that the electrical core characteristic parameter is the electrical core temperature, the electrical core voltage or the electrical core temperature rise slope, wherein the electrical core characteristic parameter value with the minimum value is used as the reference value of the electrical core characteristic parameter.

In some embodiments, the apparatus further comprises:

the sending module is used for sending thermal runaway configuration information to a vehicle after determining the thermal runaway alarm threshold of the battery cell characteristic parameter according to the parameter value group;

the thermal runaway configuration information is used for indicating the vehicle to output a thermal runaway alarm signal under the condition that a preset condition is met, wherein the preset condition is associated with a thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the number of the cell characteristic parameters is at least three, and the at least three cell characteristic parameters include a cell temperature, a cell voltage, and a cell temperature rise slope;

the preset condition comprises at least one of the following conditions:

the temperature value of the battery core is greater than the thermal runaway alarm threshold of the battery core temperature, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core;

the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold value of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold value of the voltage of the battery core;

the temperature value of the battery core is larger than the thermal runaway alarm threshold value of the battery core temperature, and the voltage acquisition of the battery core is invalid;

the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the time length when the cell current value is greater than or equal to the preset time length.

In some embodiments, the plurality of test scenarios comprises at least one of:

a test scenario of a cell level;

a test scenario of a battery module level;

a battery system level test scenario.

In some embodiments of the present invention, the,

the cell level test scenario includes at least one of: a battery cell short circuit test scene and a battery cell overcharge test scene;

the test scenario of the battery module level comprises at least one of the following: heating a test scene by the battery module and needling the test scene by the battery module;

the battery system level test scenario includes at least one of: the method comprises the following steps of a battery system overcharge test scene, a battery system immersion test scene, a battery system ball impact test scene and a battery system high-voltage loop electric connection back-twist test scene.

In some embodiments, the apparatus further comprises:

the second obtaining module is used for obtaining the electrical core characteristic parameter value of the electrical core characteristic parameter when thermal runaway occurs in a checking scene after the thermal runaway alarm threshold of the electrical core characteristic parameter is determined;

and the checking module is used for checking the thermal runaway alarm threshold of the electric core characteristic parameter according to the obtained size relationship between the electric core characteristic parameter value and the thermal runaway alarm threshold of the electric core characteristic parameter.

In some embodiments, the verification module is specifically configured to:

under the condition that the characteristic parameter of the battery core is the temperature of the battery core, the voltage of the battery core or the temperature rise slope of the battery core, if the obtained characteristic parameter value of the battery core is larger than the thermal runaway alarm threshold value of the characteristic parameter of the battery core, determining that the thermal runaway alarm threshold value of the characteristic parameter of the battery core passes the verification; otherwise, determining that the verification of the thermal runaway alarm threshold of the electrical core characteristic parameter is not passed.

In a third aspect, an embodiment of the present disclosure provides a battery thermal runaway alarm threshold determination device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the above battery thermal runaway alarm threshold determination method.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the steps of the above battery thermal runaway alarm threshold determination method.

In the embodiment of the disclosure, the cell characteristic parameters when the heat generation is out of control in a plurality of test scenes can be detected to obtain the parameter value group, and the parameter value group can include the cell characteristic parameter values of the cell characteristic parameters when the heat generation is out of control in each test scene, so that the parameter value group can reflect the real parameter values of the cell characteristic parameters when the heat generation is out of control in various test scenes. And then, determining a thermal runaway alarm threshold of the electrical core characteristic parameter according to the parameter value group, wherein the determined thermal runaway alarm threshold of the electrical core characteristic parameter can cover the thermal runaway condition under all test scenes. Compared with the situation that the thermal runaway alarm threshold is determined according to manual experience in the prior art, the embodiment of the disclosure can determine the thermal runaway alarm threshold with guaranteed accuracy and reliability based on the parameter value group obtained in the actual test scene, so that the thermal runaway alarm signal can be timely and reliably sent out.

Detailed Description

Technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

First, a method for determining a thermal runaway alarm threshold of a battery provided by an embodiment of the disclosure is described below.

It should be noted that the method for determining the warning threshold value of the battery thermal runaway provided by the embodiment of the disclosure can be applied to a device for determining the warning threshold value of the battery thermal runaway. Specifically, the battery thermal runaway alarm threshold determination device may be a server, and of course, the battery thermal runaway alarm threshold determination device may also be other electronic devices with computing and processing capabilities, which is not listed here.

Referring to fig. 1, a flowchart of a method for determining a battery thermal runaway alarm threshold provided by an embodiment of the disclosure is shown. As shown in fig. 1, the method comprises the steps of:

Here, the "plurality" of the plurality of test scenarios may be five, eight, ten, twelve or other numbers, which are not listed here.

Generally, a Battery System in a vehicle may include a Battery pack and a Battery Management System (BMS) for managing the Battery pack; the battery pack can include a battery module, a housing and a thermal management system, and the battery module can be formed by combining a plurality of battery cells in a series-parallel connection mode.

Next, the analysis result obtained according to the vehicle accident case information and the fault tree analysis result of the battery system may be combined to determine the situation that thermal runaway is likely to occur, which mainly includes: the method comprises the following steps of short circuit of the battery core, overcharge of the battery core, heating of the battery module, needling of the battery module, overcharge of the battery system, soaking of the battery system, ball impact of the battery system, electric connection and untwisting of a high-voltage loop of the battery system and the like.

a test scenario of a cell level;

a test scenario of a battery module level;

a battery system level test scenario.

In some embodiments of the present invention, the,

the cell level test scenario may include at least one of: a battery cell short circuit test scene and a battery cell overcharge test scene;

the test scenario of the battery module level may include at least one of: heating a test scene by the battery module and needling the test scene by the battery module;

the battery system level test scenario may include at least one of: the method comprises the following steps of a battery system overcharge test scene, a battery system immersion test scene, a battery system ball impact test scene and a battery system high-voltage loop electric connection back-twist test scene.

And for each test scene in the plurality of test scenes, performing vehicle test to switch the vehicle from a state in which thermal runaway does not occur to a state in which thermal runaway occurs, and detecting the electrical core characteristic parameters for each test scene respectively to obtain the electrical core characteristic parameter values of the electrical core characteristic parameters when thermal runaway occurs in each test scene, so as to obtain a parameter value group consisting of the obtained plurality of electrical core characteristic parameter values. It should be noted that, the cell characteristic parameters and the parameter value groups may be in a one-to-one correspondence relationship, that is, the number of the cell characteristic parameters is the same as the number of the parameter value groups.

And step 102, determining a thermal runaway alarm threshold of the characteristic parameter of the battery cell according to the parameter value group.

according to a screening rule matched with the battery cell characteristic parameters, screening one battery cell characteristic parameter value in the parameter value groups as a reference value of the battery cell characteristic parameters;

and determining the thermal runaway alarm threshold of the electrical core characteristic parameter according to the reference value of the electrical core characteristic parameter.

Here, the cell characteristic parameter may be a cell temperature, a cell voltage, or a cell temperature rise slope.

Specifically, the cell temperature may be detected by a temperature sensor; the cell voltage can be detected by a voltage sensor; the cell temperature rise slope can be obtained by processing the cell temperature detected by the temperature sensor, and can represent the rise of the cell temperature value in unit time. It can be understood that the three physical quantities of the cell temperature, the cell voltage and the cell temperature rise slope can effectively represent the cell characteristics when thermal runaway occurs.

It should be noted that the cell characteristic parameter may also be a cell current or other characteristic parameter, which is not listed here.

In some embodiments, screening, according to a screening rule matching with the cell characteristic parameter, one of the cell characteristic parameter values in the parameter value set as a reference value of the cell characteristic parameter includes:

and under the condition that the cell characteristic parameters are cell temperature, cell voltage or cell temperature rise slope, in the screening parameter value groups, the cell characteristic parameter value with the minimum value is used as the reference value of the cell characteristic parameters.

Specifically, assuming that the cell characteristic parameter is the cell temperature, and the parameter value group of the cell characteristic parameter includes 78 degrees celsius, 79 degrees celsius, 80 degrees celsius, and 82 degrees celsius, 78 degrees celsius may be screened out from the parameter value group, and 78 degrees celsius is used as the reference value of the cell temperature.

Therefore, the implementation mode can conveniently screen the reference values of the cell characteristic parameters.

Of course, the specific implementation of determining the reference value of the electrical core characteristic parameter through the screening operation is not limited to this, and in the case that the electrical core characteristic parameter is a parameter other than the electrical core temperature, the electrical core voltage, and the electrical core temperature rise slope, the screening process may also be to screen the electrical core characteristic parameter value with the largest value as the reference value of the electrical core characteristic parameter, and it is only necessary to ensure that the finally screened reference value of the electrical core characteristic parameter can cover the thermal runaway condition in all test scenes.

After the reference value of the electrical core characteristic parameter is obtained, the reference value of the electrical core characteristic parameter can be directly used as a thermal runaway alarm threshold value of the electrical core characteristic parameter; or, the reference value of the cell characteristic parameter may be multiplied by the safety factor, and the obtained product is used as the thermal runaway alarm threshold of the cell characteristic parameter. In particular, the safety factor may be 0.8, 0.85, 0.9, or other positive numbers less than 1, which are not listed here.

In the embodiment of the disclosure, the cell characteristic parameters when the heat generation is out of control in a plurality of test scenes can be detected to obtain the parameter value group, and the parameter value group can include the cell characteristic parameter values of the cell characteristic parameters when the heat generation is out of control in each test scene, so that the parameter value group can reflect the real parameter values of the cell characteristic parameters when the heat generation is out of control in various test scenes. And then, determining a thermal runaway alarm threshold of the electrical core characteristic parameter according to the parameter value group, wherein the determined thermal runaway alarm threshold of the electrical core characteristic parameter can cover the thermal runaway condition under all test scenes. Compared with the situation that the thermal runaway alarm threshold is determined according to manual experience in the prior art, the embodiment of the disclosure can determine the thermal runaway alarm threshold with guaranteed accuracy and reliability based on the parameter value group obtained in the actual test scene, so that the thermal runaway alarm signal can be timely and reliably sent out.

In some embodiments, after determining the thermal runaway alarm threshold of the cell characteristic parameter according to the parameter value group, the method further includes:

transmitting thermal runaway configuration information to the vehicle;

the thermal runaway configuration information is used for indicating that a vehicle outputs a thermal runaway alarm signal under the condition that a preset condition is met, and the preset condition is associated with a thermal runaway alarm threshold of the electrical core characteristic parameter.

Specifically, the number of the cell characteristic parameters is at least three, and the at least three cell characteristic parameters include a cell temperature, a cell voltage, and a cell temperature rise slope. That is, one of the at least three electrical core characteristic parameters is the electrical core temperature, another one of the at least three electrical core characteristic parameters is the electrical core voltage, and another one of the at least three electrical core characteristic parameters is the electrical core temperature rise slope.

The preset condition may include at least one of:

the temperature value of the battery core is greater than the thermal runaway alarm threshold of the battery core temperature, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core;

the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold value of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold value of the voltage of the battery core;

the temperature value of the battery core is larger than the thermal runaway alarm threshold value of the battery core temperature, and the voltage acquisition of the battery core is invalid;

the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the time length when the cell current value is greater than or equal to the preset time length.

Here, the preset value may be 1 ampere, and the preset duration may be 30 seconds, 1 minute, or 2 minutes, and of course, values of the preset value and the preset duration are not limited thereto, and may be determined specifically according to an actual situation, and the embodiment of the present disclosure does not limit this.

Here, the thermal runaway configuration information may carry a thermal runaway alarm threshold of the cell temperature, a thermal runaway alarm threshold of the cell temperature rise slope, and a thermal runaway alarm threshold of the cell voltage. In the operation process, the vehicle can detect the cell temperature, the cell voltage and the cell temperature rise slope at regular time or irregular time.

Under the condition that the temperature value of the battery core is greater than the thermal runaway alarm threshold of the temperature of the battery core, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core, the temperature value of the battery core and the temperature rise slope value of the battery core can be considered to both reach alarm conditions; when the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold of the voltage of the battery core, the temperature rise slope value of the battery core and the voltage value of the battery core can be considered to reach alarm conditions; when the temperature value of the battery core is greater than the thermal runaway alarm threshold value of the temperature of the battery core and the voltage acquisition of the battery core fails, the temperature value of the battery core can be considered to reach the alarm condition, and the voltage value of the battery core cannot be acquired at all; when the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the duration that the cell current value is greater than or equal to the preset duration, it can be considered that the cell voltage value reaches the alarm condition, and the cell is in an overcharged state. Under any one of the four conditions, a thermal runaway alarm threshold value can be output, so that the driver and the passengers can take measures in time to deal with the thermal runaway, and the safety of the driver and the passengers is ensured.

In some embodiments, after determining the thermal runaway alarm threshold for the cell characteristic parameter, the method further includes:

under a calibration scene, acquiring a cell characteristic parameter value of a cell characteristic parameter when thermal runaway occurs;

and verifying the thermal runaway alarm threshold of the electrical core characteristic parameter according to the obtained relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter.

Here, the verification scenario includes, but is not limited to, a fire scenario, a wade scenario, and the like.

Specifically, according to the obtained relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter, the thermal runaway alarm threshold of the electrical core characteristic parameter is verified, including:

under the condition that the characteristic parameter of the battery cell is the temperature of the battery cell, the voltage of the battery cell or the temperature rise slope of the battery cell, if the obtained characteristic parameter value of the battery cell is larger than the thermal runaway alarm threshold value of the characteristic parameter of the battery cell, determining that the thermal runaway alarm threshold value of the characteristic parameter of the battery cell passes the verification; otherwise, determining that the verification of the thermal runaway alarm threshold of the cell characteristic parameter is not passed.

Assuming that the electrical core characteristic parameter is the electrical core temperature, it can be understood that, under a normal condition, the electrical core temperature value when thermal runaway occurs should be greater than the thermal runaway alarm threshold of the electrical core temperature determined before, then, under a calibration scene, the electrical core temperature when thermal runaway occurs is collected to obtain the electrical core temperature value, and then, the obtained electrical core temperature value and the thermal runaway alarm threshold of the electrical core temperature can be compared in size. If the comparison result is that the obtained electric core temperature value is greater than the thermal runaway alarm threshold of the electric core temperature, which indicates that the comparison result is consistent with the normal condition, the verification of the thermal runaway alarm threshold of the electric core temperature can be determined to be passed; otherwise, it can be determined that the verification of the thermal runaway alarm threshold of the cell temperature fails.

Therefore, the mode can conveniently and reliably verify the thermal runaway alarm threshold of the electrical core characteristic parameter.

Optionally, in a calibration scenario, a plurality of cell temperature values when thermal runaway occurs may be obtained, and if each of the obtained plurality of cell temperature values is greater than a thermal runaway alarm threshold of the cell temperature, it may be determined that the calibration on the thermal runaway alarm threshold of the cell temperature passes; otherwise, it can be determined that the verification of the thermal runaway alarm threshold of the cell temperature fails.

Therefore, in the embodiment of the disclosure, the thermal runaway alarm threshold of the electrical core characteristic parameter can be verified, so that the accuracy and reliability of the thermal runaway alarm threshold finally used on the vehicle are ensured.

In summary, in the embodiment of the disclosure, a relatively accurate thermal runaway alarm threshold can be obtained through test data in a plurality of test scenarios, and the accuracy of the thermal runaway alarm threshold used on a vehicle can be further ensured through checking the thermal runaway alarm threshold, so that when a thermal runaway occurs, a battery management system of the vehicle can timely and reliably send out a thermal runaway alarm signal.

The following describes an alarm threshold determination device provided by an embodiment of the present disclosure.

the screening submodule is used for screening one electric core characteristic parameter value in the parameter value group as a reference value of the electric core characteristic parameter according to a screening rule matched with the electric core characteristic parameter;

and the determining submodule is used for determining the thermal runaway alarm threshold of the electrical core characteristic parameter according to the reference value of the electrical core characteristic parameter.

In some embodiments, the screening submodule is specifically configured to:

and under the condition that the cell characteristic parameters are cell temperature, cell voltage or cell temperature rise slope, in the screening parameter value groups, the cell characteristic parameter value with the minimum value is used as the reference value of the cell characteristic parameters.

the sending module is used for sending thermal runaway configuration information to the vehicle after determining the thermal runaway alarm threshold of the electrical core characteristic parameter according to the parameter value group;

the thermal runaway configuration information is used for indicating that a vehicle outputs a thermal runaway alarm signal under the condition that a preset condition is met, and the preset condition is associated with a thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the number of the cell characteristic parameters is at least three, and the at least three cell characteristic parameters include a cell temperature, a cell voltage, and a cell temperature rise slope;

the preset conditions include at least one of the following:

the temperature value of the battery core is greater than the thermal runaway alarm threshold of the battery core temperature, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core;

the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold value of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold value of the voltage of the battery core;

the temperature value of the battery core is larger than the thermal runaway alarm threshold value of the battery core temperature, and the voltage acquisition of the battery core is invalid;

the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the time length when the cell current value is greater than or equal to the preset time length.

In some embodiments, the plurality of test scenarios includes at least one of:

a test scenario of a cell level;

a test scenario of a battery module level;

a battery system level test scenario.

In some embodiments of the present invention, the,

the test scene of the cell level comprises at least one of the following: a battery cell short circuit test scene and a battery cell overcharge test scene;

the test scene of the battery module level comprises at least one of the following items: heating a test scene by the battery module and needling the test scene by the battery module;

the test scenario at the battery system level includes at least one of: the method comprises the following steps of a battery system overcharge test scene, a battery system immersion test scene, a battery system ball impact test scene and a battery system high-voltage loop electric connection back-twist test scene.

the second obtaining module is used for obtaining the electrical core characteristic parameter value of the electrical core characteristic parameter when thermal runaway occurs in a checking scene after the thermal runaway alarm threshold of the electrical core characteristic parameter is determined;

and the checking module is used for checking the thermal runaway alarm threshold of the electrical core characteristic parameter according to the obtained relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the verification module is specifically configured to:

under the condition that the characteristic parameter of the battery cell is the temperature of the battery cell, the voltage of the battery cell or the temperature rise slope of the battery cell, if the obtained characteristic parameter value of the battery cell is larger than the thermal runaway alarm threshold value of the characteristic parameter of the battery cell, determining that the thermal runaway alarm threshold value of the characteristic parameter of the battery cell passes the verification; otherwise, determining that the verification of the thermal runaway alarm threshold of the cell characteristic parameter is not passed.

Compared with the situation that the thermal runaway alarm threshold is determined according to manual experience in the prior art, the embodiment of the disclosure can determine the thermal runaway alarm threshold with guaranteed accuracy and reliability based on the parameter value group obtained in the actual test scene, so that the thermal runaway alarm signal can be timely and reliably sent out.

The following describes a battery thermal runaway alarm threshold determination device provided by an embodiment of the disclosure.

detecting the cell characteristic parameters when the heat is out of control in a plurality of test scenes to obtain a parameter value group; the parameter value group comprises electric core characteristic parameter values of the electric core characteristic parameters when heat is out of control in each test scene;

and determining the thermal runaway alarm threshold of the characteristic parameters of the battery cell according to the parameter value group.

according to a screening rule matched with the battery cell characteristic parameters, screening one battery cell characteristic parameter value in the parameter value groups as a reference value of the battery cell characteristic parameters;

and determining the thermal runaway alarm threshold of the electrical core characteristic parameter according to the reference value of the electrical core characteristic parameter.

and under the condition that the cell characteristic parameters are cell temperature, cell voltage or cell temperature rise slope, in the screening parameter value groups, the cell characteristic parameter value with the minimum value is used as the reference value of the cell characteristic parameters.

after determining a thermal runaway alarm threshold of the characteristic parameters of the battery cell according to the parameter value group, sending thermal runaway configuration information to a vehicle;

the thermal runaway configuration information is used for indicating that a vehicle outputs a thermal runaway alarm signal under the condition that a preset condition is met, and the preset condition is associated with a thermal runaway alarm threshold of the electrical core characteristic parameter.

In some embodiments, the number of the cell characteristic parameters is at least three, and the at least three cell characteristic parameters include a cell temperature, a cell voltage, and a cell temperature rise slope;

the preset conditions include at least one of the following:

the temperature value of the battery core is greater than the thermal runaway alarm threshold of the battery core temperature, and the temperature rise slope value of the battery core is greater than the thermal runaway alarm threshold of the temperature rise slope of the battery core;

the temperature rise slope value of the battery core is larger than the thermal runaway alarm threshold value of the temperature rise slope of the battery core, and the voltage value of the battery core is smaller than the thermal runaway alarm threshold value of the voltage of the battery core;

the temperature value of the battery core is larger than the thermal runaway alarm threshold value of the battery core temperature, and the voltage acquisition of the battery core is invalid;

the cell voltage value is higher than the thermal runaway alarm threshold of the cell voltage, and the time length when the cell current value is greater than or equal to the preset time length.

In some embodiments, the plurality of test scenarios includes at least one of:

a test scenario of a cell level;

a test scenario of a battery module level;

a battery system level test scenario.

In some embodiments of the present invention, the,

the test scene of the cell level comprises at least one of the following: a battery cell short circuit test scene and a battery cell overcharge test scene;

the test scene of the battery module level comprises at least one of the following items: heating a test scene by the battery module and needling the test scene by the battery module;

the test scenario at the battery system level includes at least one of: the method comprises the following steps of a battery system overcharge test scene, a battery system immersion test scene, a battery system ball impact test scene and a battery system high-voltage loop electric connection back-twist test scene.

after determining a thermal runaway alarm threshold of the electrical core characteristic parameter, acquiring an electrical core characteristic parameter value of the electrical core characteristic parameter when the thermal runaway occurs in a calibration scene;

and verifying the thermal runaway alarm threshold of the electrical core characteristic parameter according to the obtained relationship between the electrical core characteristic parameter value and the thermal runaway alarm threshold of the electrical core characteristic parameter.

under the condition that the characteristic parameter of the battery cell is the temperature of the battery cell, the voltage of the battery cell or the temperature rise slope of the battery cell, if the obtained characteristic parameter value of the battery cell is larger than the thermal runaway alarm threshold value of the characteristic parameter of the battery cell, determining that the thermal runaway alarm threshold value of the characteristic parameter of the battery cell passes the verification; otherwise, determining that the verification of the thermal runaway alarm threshold of the cell characteristic parameter is not passed.

Compared with the situation that the thermal runaway alarm threshold is determined according to manual experience in the prior art, the embodiment of the disclosure can determine the thermal runaway alarm threshold with guaranteed accuracy and reliability based on the parameter value group obtained in the actual test scene, so that the thermal runaway alarm signal can be timely and reliably sent out.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.