CN215244443U - A battery full-time detection device, system and automobile - Google Patents

The utility model provides a full-time battery detection device, a system and an automobile, which comprises a BMS slave plate and a BMS main plate which are connected with each other; the input end of the BMS slave plate is connected with a vehicle-mounted power battery, and the output end of the BMS slave plate is connected with the input end of the BMS main board; when the BMS slave board is used for enabling the whole vehicle to enter a dormant state, comparing the temperature value of each battery module with a preset normal temperature threshold value through a voltage comparator, or comparing the voltage value of each battery module with a preset normal voltage threshold value to obtain a comparison result; when the temperature value or the voltage value of a certain battery module is abnormal, awakening the BMS mainboard and outputting abnormal information; and the BMS mainboard is used for judging the state of the vehicle-mounted power battery according to the abnormal information and uploading the detection data of the vehicle-mounted power battery according to the detection result. The utility model solves the direct monitoring of thermal runaway with a low cost scheme; the risk of low-voltage battery feed of the whole vehicle caused by real-time monitoring of battery faults or thermal runaway is reduced.

Full-time battery detection device and system and automobile

Technical Field

The utility model relates to an electric motor car battery safety technical field especially relates to a battery full-time detection device.

Background

Currently, the detection of battery failure or thermal runaway is mainly achieved through two ways:

firstly, without adding a sensor, on the basis of voltage acquisition, a current sensor and Battery System software of the existing Battery System, a Battery Management System (BMS) monitors the voltage and the temperature of the Battery System, and compares the voltage and the temperature with an initially set threshold value to judge whether a fault or thermal runaway occurs. The method has the advantages that a certain thermal runaway monitoring effect can be achieved under the condition that a battery system is powered on and works, but in a normal condition, after a whole vehicle is powered off, a Battery Management System (BMS) can be powered off and sleeps, the monitoring on battery faults or thermal runaway cannot be achieved after the BMS sleeps, at the moment, monitoring and early warning cannot be achieved if faults or thermal runaway occur, functions can fail, and requirements cannot be met; the battery system is required to continuously operate after the entire vehicle is put into power sleep, but the continuous operation of the BMS causes two problems: firstly, the electricity consumption of the low-voltage storage battery is high due to the continuous work of the BMS, and the problem of the feed of the storage battery of the whole vehicle can be caused with high probability; and secondly, the service life of the BMS is also shortened by the long-time operation of the BMS.

Secondly, according to the characteristics of thermal runaway, when the thermal runaway occurs, besides the voltage and the temperature of a battery system are changed, the gas pressure, the oxygen content, the gas components and the salt fog in the system are also obviously changed. The thermal runaway is directly monitored by adding sensors, such as a gas pressure sensor, an oxygen sensor, a gas sensor, a smoke sensor and the like; if the thermal runaway occurs, the BMS is awakened to confirm and send out an early warning signal through the monitoring and awakening unit. One or more sensors (pressure, oxygen and gas components) are added on the basis of software and hardware of the current battery system, when the thermal runaway is monitored by the one or more sensors (pressure, oxygen and gas components) under the working state of the vehicle, the BMS in the dormant state is awakened, and whether the thermal runaway really occurs is comprehensively judged by combining the change of the voltage, the temperature and the SOC of the battery system by the BMS. However, in general, only when thermal runaway occurs, there is a change in characteristic quantity such as smoke pressure, and its wake-up and detection mainly aim at the thermal runaway event, and cannot detect a failure such as a cell abnormality, and then the cost of a single sensor (pressure, oxygen, gas component) is relatively high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery full-time detection device, it is with high costs to the direct monitoring of thermal runaway to solve, and real-time supervision battery trouble or thermal runaway cause the technical problem of whole car low voltage battery feed.

In one aspect, a full-time battery detection device is provided, including: the BMS slave boards and the BMS main boards are connected with each other; the input end of the BMS slave plate is connected with a vehicle-mounted power battery, and the output end of the BMS slave plate is connected with the input end of the BMS main board;

when the BMS slave board is used for enabling the whole vehicle to enter a dormant state, comparing the temperature value of each battery module with a preset normal temperature threshold value through a voltage comparator, or comparing the voltage value of each battery module with a preset normal voltage threshold value to obtain a comparison result; when the comparison result is that the temperature value or the voltage value of a certain battery module is abnormal, awakening the BMS mainboard and outputting abnormal information;

the BMS mainboard is used for determining whether to detect the state of the vehicle-mounted power battery according to the abnormal information and uploading the detection data of the vehicle-mounted power battery or outputting alarm information according to the detection result.

Preferably, an AFE chip is arranged in the BMS slave board, and an input end of the AFE chip is connected with each battery module in the vehicle-mounted power battery and is used for collecting a temperature value and a voltage value of the battery module; the AFE chip compares the temperature value of each battery module with a preset normal temperature threshold value through a voltage comparator, or compares the voltage value of each battery module with a preset normal voltage threshold value, and when the temperature value or the voltage value is not within the range of the preset normal threshold value, an awakening signal is generated.

Preferably, the output end of the AFE chip is connected to the BMS board and configured to output a wake-up signal, a temperature value and a voltage value of each battery module to the BMS board.

Preferably, the input end of the BMS board is connected to the output end of the BMS board for receiving a wake-up signal, and the state of the vehicle-mounted power battery is detected when it is determined that the abnormal information satisfies a preset wake-up condition.

On the other hand, the full-time battery detection system comprises a VCU, a TEL, an ICM, a background terminal and a full-time battery detection device for detecting the vehicle-mounted power battery;

the full-time battery detection device comprises a BMS slave plate and a BMS main plate which are connected with each other; the input end of the BMS slave plate is connected with a vehicle-mounted power battery, and the output end of the BMS slave plate is connected with the input end of the BMS main board; the output end of the BMS mainboard is respectively connected with the VCU, the TEL and the ICM; the TEL output end is connected with the background terminal;

when the BMS slave board is used for enabling the whole vehicle to enter a dormant state, comparing the temperature value of each battery module with a preset normal temperature threshold value through a voltage comparator, or comparing the voltage value of each battery module with a preset normal voltage threshold value to obtain a comparison result; when the comparison result is that the temperature value or the voltage value of a certain battery module is abnormal, awakening the BMS mainboard and outputting abnormal information;

the BMS mainboard is used for determining whether the state of the vehicle-mounted power battery is detected or not according to the abnormal information and uploading vehicle-mounted power battery detection data to the VCU/the TEL/the ICM according to the detection result;

and the TEL is used for uploading the detection data of the vehicle-mounted power battery to the background terminal.

Preferably, an AFE chip is arranged in the BMS slave board, and an input end of the AFE chip is connected with each battery module in the vehicle-mounted power battery and is used for collecting a temperature value and a voltage value of the battery module; the AFE chip compares the temperature value of each battery module with a preset normal temperature threshold value through a voltage comparator, or compares the voltage value of each battery module with a preset normal voltage threshold value, and when the temperature value or the voltage value is not within the range of the preset normal threshold value, an awakening signal is generated; and the output end of the AFE chip is connected with the BMS mainboard and is used for outputting a wake-up signal, a temperature value and a voltage value of each battery module to the BMS mainboard.

Preferably, the input end of the BMS board is connected to the output end of the BMS board for receiving a wake-up signal, and the state of the vehicle-mounted power battery is detected when it is determined that the abnormal information satisfies a preset wake-up condition.

Preferably, the output terminal of the BMS motherboard is connected to the input terminal of the VCU, the TEL input terminal, and the ICM input terminal, respectively;

when the BMS mainboard detects that the vehicle-mounted power battery is in fault, a battery fault state signal and a network management awakening signal are output to the VCU;

when the BMS mainboard detects the thermal runaway of the vehicle-mounted power battery, outputting a thermal runaway fault prompt signal and a network management awakening signal to the TEL and the ICM;

when the BMS mainboard determines to upload the detection data of the vehicle-mounted power battery, the detection data of the vehicle-mounted power battery is uploaded to the background terminal through the TEL.

Preferably, the input end of the background terminal is connected with the output end of the TEL and is used for receiving detection data of the vehicle-mounted power battery; the output end of the background terminal is connected with the mobile terminal and used for outputting a data analysis result and an alarm signal.

In another aspect, an automobile is also provided, and the full-time detection system for the battery is included.

To sum up, implement the utility model discloses an embodiment has following beneficial effect:

the utility model provides a battery full-time detection device, system and car, under current battery system structure, the direct monitoring to thermal runaway has been solved to low-cost scheme (mainly aiming at the full-time detection strategy improvement of current chip awakening function); when the BMS is in sleep, the BMS mainboard is awakened only when the BMS searches that the battery meets the awakening condition through the voltage comparison method, detection and confirmation are carried out, and the risk of low-voltage battery feed of the whole vehicle caused by real-time monitoring of battery failure or thermal runaway is reduced; and the battery part faults such as overlarge self-discharge of a battery core and the like are effectively determined.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings obtained from these drawings still belong to the scope of the present invention without inventive laboriousness.

Fig. 1 is a schematic diagram of a full-time battery detection device according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a full-time battery detection system according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a full-time battery detection logic according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

More specifically, the secondary wake-up sub-condition is that the voltage is less than or equal to V/the voltage is greater than or equal to V/the temperature is greater than or equal to ℃. The first-level awakening sub-conditions are corresponding, when the first-level awakening sub-conditions determine a condition, the corresponding second-level awakening sub-conditions are required to be generated to start uploading data, and if the corresponding second-level awakening sub-conditions are not generated, the data are only detected not to be uploaded.

Specifically, the correspondence between the primary wake-up sub-condition and the secondary wake-up sub-condition is as follows:

a voltage less than or equal to XV (primary wake-up condition), corresponding to which is a': a voltage less than or equal to XV (secondary wake-up condition);

b: a voltage greater than or equal to XV (primary wake-up condition), corresponding to b' a voltage greater than or equal to XV (secondary wake-up condition);

c: the temperature is greater than or equal to X ℃ (primary awakening condition), and the corresponding temperature is c': the temperature is greater than or equal to X ℃ (secondary awakening condition);

d: temperature sampling fault (X ℃) (primary wake-up condition).

Specifically, as shown in fig. 3, after the BMS motherboard 2 receives the wake-up signal, it first determines whether the wake-up condition is valid, that is, whether the preset wake-up condition is satisfied, and after determining that the wake-up condition is satisfied (T2), it starts to upload data (status data of each battery module of the vehicle-mounted power battery 3) and performs battery detection (detect whether there is a fault), and performs a second-level sub-condition dynamic flash on the chip of the wake-up channel at a certain time after determining the wake-up condition (T3), and detects that the T4 does not satisfy the total thermal runaway condition (preset), and does not satisfy the second-level wake-up sub-condition (as described later), and then performs a sleep state, that is, it finds that there are no thermal failure and fault conditions after starting detection, and continues to switch to sleep; after a period of time (T5), the secondary wake-up sub-condition (fault) is met at a certain moment, the BMS board 2 continues to wake up (T6), the BMS board 2 detects the T8 after confirming the wake-up condition (T7), data is uploaded in the process, and the total thermal runaway condition (thermal runaway fault) is met at the moment T9 in the period of time, and then the data (thermal runaway data) is uploaded to T10.

More specifically, the secondary wake-up sub-condition is that the voltage is less than or equal to V/the voltage is greater than or equal to V/the temperature is greater than or equal to ℃. The first-level awakening sub-conditions are corresponding, when the first-level awakening sub-conditions determine a condition, the corresponding second-level awakening sub-conditions are required to be generated to start uploading data, and if the corresponding second-level awakening sub-conditions are not generated, the data are only detected not to be uploaded. Specifically, the correspondence between the primary wake-up sub-condition and the secondary wake-up sub-condition is as follows:

a voltage less than or equal to XV (primary wake-up condition), corresponding to which is a': a voltage less than or equal to XV (secondary wake-up condition);

b: a voltage greater than or equal to XV (primary wake-up condition), corresponding to b' a voltage greater than or equal to XV (secondary wake-up condition);

c: the temperature is greater than or equal to X ℃ (primary awakening condition), and the corresponding temperature is c': the temperature is greater than or equal to X ℃ (secondary awakening condition);

d: temperature sampling fault (X ℃) (primary wake-up condition).

The utility model also provides a pair of car, include battery full-time detecting system.

To sum up, implement the utility model discloses an embodiment has following beneficial effect:

the utility model provides a battery full-time detection device, system and car, under current battery system structure, the direct monitoring to thermal runaway has been solved to low-cost scheme (mainly aiming at the full-time detection strategy improvement of current chip awakening function); when the BMS is in sleep, the BMS mainboard is awakened only when the BMS searches that the battery meets the awakening condition through the voltage comparison method, detection and confirmation are carried out, and the risk of low-voltage battery feed of the whole vehicle caused by real-time monitoring of battery failure or thermal runaway is reduced; and the battery part faults such as overlarge self-discharge of a battery core and the like are effectively determined.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.