CN102222949A - Device and method for managing batteries - Google Patents

The invention discloses a device and method for managing batteries. The method comprises the following steps: determining whether an external power supply needs to be connected; using the external power supply to directly supply power for an electricity consumption module if the external power supply needs to be connected; determining whether the electric quantity of a first battery is lower than a first threshold if the external power supply does not need to be connected; using the first battery to supply power for the electricity consumption module if the electric quantity of the first battery is not lower than the first threshold, and determining whether the electric quantity of a second battery is lower than the first threshold if the electric quantity of the first battery is lower than the first threshold; and using the second battery to supply power for the electricity consumption module if the electric quantity of the second battery is not lower than the first threshold, and stopping to supply power for the electricity consumption module if the electric quantity of the second battery is lower than the first threshold. According to the invention, the first battery and the second battery can work in an alternative mode, and the battery can be replaced instead of being charged directly when lack of power, so the number of charge cycles can be reduced and the situation that the shortened life expectancy of a battery can cause the life expectancy of the whole power supply system to be shortened can be avoided, thus the service life of the battery powered system can be improved as a whole.

The battery management device and method

Technical field

The present invention relates to electronic applications, relate in particular to a kind of battery management device and method.

Background technology

Battery power supply system is one of important component part of portable type electronic product, and is more and more higher to the requirement in useful life of battery power supply system along with the development of portable type electronic product, and the bottleneck in restriction battery power supply system useful life is battery life.

What current portable type electronic product use was more is lithium polymer battery, and it has the advantage that volume is little, plasticity is strong, safe.But lithium ion battery is along with the increase of charging times, and its electric core energy stored is also reducing gradually.Charging times is many more frequent more, causes the lithium ion life-span sharply to shorten just easily more, thereby how reduces the number of times that discharges and recharges of battery by appropriate design, and the aging speed that prolongs battery becomes the difficult problem of industry.

Except prolonging the life-span of battery power supply system by the charging times that reduces battery in the battery power supply system, the scheme that adopts the monocell power supply in the current battery power supply system also is to cause short major reason of battery power supply system life-span.

The scheme that adopts the double cell control device that duplicate supply is controlled is arranged in the prior art, it utilizes integrated circuit to realize that the double cell of single-chip switches, reaches management of charging and discharging, but opportunity and the use priority effectively double cell not switched in this scheme are elaborated, may be in the use of double cell, the phenomenon that double cell discharges simultaneously can take place, cause the double cell life-span identical, thereby can't prolong the life-span of battery power supply system on the whole.

Summary of the invention

The technical problem that the present invention mainly solves provides a kind of battery management device and method, can reduce the number of times that double cell discharges simultaneously, thereby extend the life of a cell.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: battery management method is provided, may further comprise the steps:

Judge whether connect external power supply;

If adopt external power supply directly to be the electricity consumption module for power supply;

If not, judge whether first battery electric quantity is lower than first threshold;

If first battery electric quantity is not less than first threshold, then adopting first battery is the electricity consumption module for power supply, if first battery electric quantity is lower than first threshold, judges then whether second battery electric quantity is lower than first threshold;

If second battery electric quantity is not less than first threshold, then adopting second battery is the electricity consumption module for power supply, if second battery electric quantity is lower than first threshold, then stops to be the electricity consumption module for power supply.

Wherein, connecting external power supply, adopt external power supply directly in the step of electricity consumption module for power supply, also comprise judging whether first cell voltage is lower than the step of second threshold value: if first cell voltage is lower than second threshold value, then adopting external power supply is first battery charge, and second threshold value is greater than first threshold.

Wherein, connecting external power supply, adopt external power supply directly in the step of electricity consumption module for power supply, also comprise judging whether second cell voltage is lower than the step of second threshold value: if second cell voltage is lower than second threshold value, then adopting external power supply is second battery charge.

Wherein, being lower than second threshold value and adopting external power supply when first cell voltage is in the step of first battery charge, also comprise: first cell voltage is judged stop first battery charge, the 3rd threshold value is greater than second threshold value when first cell voltage reaches the 3rd threshold value.

Wherein, being lower than second threshold value and adopting external power supply when second cell voltage is in the step of second battery charge, also comprise: second cell voltage is judged stop second battery charge, the 3rd threshold value is greater than second threshold value when second cell voltage reaches the 3rd threshold value.

For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of battery management device is provided, comprises: external power interface, electricity consumption module interface, first battery, second battery and battery management module; Described battery management module is used to judge whether external power interface connects external power supply; If adopt the electricity consumption module interface directly to be the electricity consumption module for power supply; If not, judge whether first battery electric quantity is lower than first threshold; If first battery electric quantity is higher than first threshold, then adopting first battery is the electricity consumption module for power supply, if first battery electric quantity is lower than first threshold, judges then whether second battery electric quantity is lower than first threshold; If second battery electric quantity is higher than first threshold, then adopting second battery is the electricity consumption module for power supply, if second battery electric quantity is lower than first threshold, then stops to be the electricity consumption module for power supply.

Wherein, in the described battery management device, described battery management module is used to judge whether first cell voltage is lower than second threshold value, and then to adopt external power supply be first battery charge if first cell voltage is lower than second threshold value; Described battery management module is used to also judge whether second cell voltage is lower than second threshold value, and then to adopt external power supply be second battery charge if second cell voltage is lower than second threshold value, and second threshold value is greater than first threshold.

Wherein, in the described battery management device, described battery management module is used for first cell voltage is judged, stops when first cell voltage is higher than the 3rd threshold value first battery charge; Described charge management module also is used for second cell voltage is judged, stops when second cell voltage is higher than the 3rd threshold value second battery charge, and the 3rd threshold value is greater than second threshold value.

Wherein, described battery management module comprises first electronic switch, second electronic switch, the 3rd electronic switch, first resistance, second resistance, analog to digital converter, digital to analog converter and microprocessor; External power interface connects first end of first electronic switch, and second end of first electronic switch connects the electricity consumption module interface; Second electronic switch, first end connects second end of first electronic switch, and second end of second electronic switch connects first end of first resistance, and second end of first resistance connects the positive pole of first battery, the minus earth of first battery; The 3rd electronic switch first end connects second end of first electronic switch, and second end of the 3rd electronic switch connects first end of second resistance, and second end of second resistance connects the positive pole of second battery, the minus earth of second battery; First electronic switch, second electronic switch and the 3rd electronic switch all have control end; Digital to analog converter has input, first output, second output and the 3rd output; Analog to digital converter has first input end, second input, the 3rd input, four-input terminal and output; The control end of first electronic switch is connected with first output of digital to analog converter, the control end of second electronic switch is connected with second output of digital to analog converter, the control end of the 3rd electronic switch is connected with the 3rd output of digital to analog converter, the input of digital to analog converter is connected with the output of microprocessor, the input of microprocessor is connected with the output of analog to digital converter, first end of first resistance is also connected to the first input end of analog to digital converter, first end of second resistance is also connected to second input of analog to digital converter, second end of first resistance is also connected to the 3rd input of analog to digital converter, second end of second resistance is also connected to the four-input terminal of analog to digital converter, and analog to digital converter 116 is connected microprocessor respectively with digital to analog converter 117.

Wherein, described first electronic switch is the PMOS pipe, and described second electronic switch is the NMOS pipe, and described the 3rd electronic switch is the NMOS pipe.

The invention has the beneficial effects as follows: the phenomenon that double cell discharges simultaneously can take place in the double cell control device that is different from prior art, cause identical defective of double cell life-span, the present invention at first can judge whether be connected with external power supply, if be connected with external power supply then directly use external power supply power supply, judge when no external power supply whether first battery can power, when first powered battery, close second battery, have only and when first battery electric quantity is not enough, just use second battery, and judge second battery electric quantity, when second battery electric quantity is also not enough, stop to be the electricity consumption module for power supply, in such battery management method, first battery and the second battery alternation, directly charging but change battery and use when battery electric quantity is not enough, reduce the charging times of battery, do not allow a shorter battery life cause the situation of the whole electric power system lost of life with regard to not producing, thereby can improve the whole service life of battery power supply system.

Description of drawings

Fig. 1 is the first embodiment flow chart of steps of battery management method of the present invention;

Fig. 2 is the first embodiment program flow diagram of battery management method of the present invention;

Fig. 3 is the second embodiment program flow diagram of battery management method of the present invention;

Fig. 4 is the 3rd an embodiment program flow diagram of battery management method of the present invention;

Fig. 5 is a battery management device example structure schematic diagram of the present invention;

Fig. 6 is that battery management device embodiment of the present invention is electrically connected block diagram;

Fig. 7 is a battery management device embodiment circuit diagram of the present invention.

Embodiment

Below, reach accompanying drawing in conjunction with specific embodiments, the present invention is made detailed description.

See also Fig. 1 and Fig. 2, among first embodiment of battery management method of the present invention, may further comprise the steps:

Step 101: judge whether connect external power supply;

Step 102: if adopt external power supply directly to be the electricity consumption module for power supply;

Step 103: if not, judge whether first battery electric quantity is lower than first threshold;

Step 104: if first battery electric quantity is not less than first threshold, then adopting first battery is the electricity consumption module for power supply, if first battery electric quantity is lower than first threshold, judges then whether second battery electric quantity is lower than first threshold;

Step 105: if second battery electric quantity is not less than first threshold, then adopting second battery is the electricity consumption module for power supply, if second battery electric quantity is lower than first threshold, then stops to be the electricity consumption module for power supply.

First threshold is the minimum supply power voltage of first battery and second battery, and voltage promptly shuts down.After cell voltage was lower than minimum supply power voltage, for the protection battery is not damaged, stopping battery was the electricity consumption module for power supply.

More than can understand, the phenomenon that double cell discharges simultaneously can take place in the double cell control device that is different from prior art, cause identical defective of double cell life-span, the present invention at first can judge whether be connected with external power supply, if be connected with external power supply then directly use external power supply power supply, judge when no external power supply whether first battery can power, when first powered battery, close second battery, have only and when first battery electric quantity is not enough, just use second battery, and judge second battery electric quantity, when second battery electric quantity is also not enough, stop to be the electricity consumption module for power supply, in such battery management method, first battery and the second battery alternation, directly charging but change battery and use when battery electric quantity is not enough, reduce the charging times of battery, do not allow a shorter battery life cause the situation of the whole electric power system lost of life with regard to not producing, thereby can improve the whole service life of battery power supply system.

See also Fig. 3, in second embodiment of battery management method of the present invention, connecting external power supply, adopt external power supply directly in the step of electricity consumption module for power supply, also comprise judging whether first cell voltage is lower than the step of second threshold value: if first cell voltage is lower than second threshold value, then adopting external power supply is first battery charge, and second threshold value is greater than first threshold.

Second threshold value is the charging cut-in voltage of first battery and second battery, just begins charging when having only cell voltage to be lower than this threshold value, can be set at 80%～90% of saturated electric weight, can reduce charging times like this.Certainly, according to actual needs, also can be set at other ratio of saturated electric weight, above-mentioned setting ratio is only used for illustrating the present invention, is not limited to protection scope of the present invention.

Under the situation of using external power supply directly to power as the electricity consumption module, whether the electric weight of judging first battery is lower than second threshold value, only drop to and just be necessary first battery is charged when being lower than second threshold value at electric weight, can reduce the charging times of first battery like this, prolong the useful life of first battery, thereby prolong the whole service life of battery power supply system.

See also Fig. 4, in the 3rd embodiment of battery management method of the present invention, connecting external power supply, adopt external power supply directly in the step of electricity consumption module for power supply, also comprise judging whether second cell voltage is lower than the step of second threshold value: if second cell voltage is lower than second threshold value, then adopting external power supply is second battery charge.

In this embodiment, under the situation of using external power supply directly to power as the electricity consumption module, whether the electric weight of judging second battery is lower than second threshold value, only drop to and just be necessary second battery is charged when being lower than second threshold value at electric weight, can reduce the charging times of second battery like this, prolong the useful life of second battery, thereby prolong the whole service life of battery power supply system.

In another embodiment of the present invention, being lower than second threshold value and adopting external power supply when first cell voltage is in the step of first battery charge, also comprise: first cell voltage is judged, stop when first cell voltage reaches the 3rd threshold value first battery charge, the 3rd threshold value is greater than second threshold value.

The 3rd threshold value is meant saturation threshold, has only that to think that just battery has filled after the threshold value full when charging reaches capacity, and stops to charge.

In this embodiment, when first cell voltage when being lower than second threshold value, need judge first battery electric quantity, have only when first battery electric quantity once fills saturated just stopping and charging, just stop charging when promptly first battery electric quantity reaches the 3rd threshold value, can reduce the charging times of first battery like this, thereby prolong the useful life of first battery.

In another embodiment of the present invention, being lower than second threshold value and adopting external power supply when second cell voltage is in the step of second battery charge, also comprise: second cell voltage is judged, stop when second cell voltage reaches the 3rd threshold value second battery charge, the 3rd threshold value is greater than second threshold value.

In this embodiment, when second cell voltage when being lower than second threshold value, need judge second battery electric quantity, have only when second battery electric quantity once fills saturated just stopping and charging, just stop charging when promptly second battery electric quantity reaches the 3rd threshold value, can reduce the charging times of second battery like this, thereby prolong the useful life of second battery.

See also Fig. 5, battery management device embodiment of the present invention comprises:

The control end of first electronic switch 111 is connected with first output of digital to analog converter 116, the control end of second electronic switch 112 is connected with second output of digital to analog converter 116, the control end of the 3rd electronic switch 113 is connected with the 3rd output of digital to analog converter 116, the input of digital to analog converter 116 is connected with the output of microprocessor 118, the input of microprocessor 118 is connected with the output of analog to digital converter 117, first end of first resistance 114 is also connected to the first input end of analog-to-digital conversion 117 devices, first end of second resistance 115 is also connected to second input of analog to digital converter 117, second end of first resistance 114 is also connected to the 3rd input of analog to digital converter 117, and second end of second resistance 115 is also connected to the four-input terminal of analog to digital converter 117.

Above-mentioned first electronic switch 111 is the PMOS pipe, and above-mentioned second electronic switch 112 is the NMOS pipe, and above-mentioned the 3rd electronic switch 113 is the NMOS pipe.

Continue to consult Fig. 6, in the preferred embodiments of the present invention, the course of work of battery management device is:

When first battery, 13 voltages and second battery, 14 voltages all are lower than second predetermined threshold, stop to be the electricity consumption module for power supply that the electricity consumption module is closed.

Power management module interface (V_SYS) 201, be connected to the interface of power management module, power management module then can convert system's power supply to the needed voltage in inner each unit of mobile phone; The connector of charging inlet 202, connection external charger; P_MOS pipe 203, connection charging inlet 202 and system's supply lines are used for the level import system supply lines (V_SYS) with charger; The one N_MOS manages 204, controls its conducting or shutoff, decision discharging and recharging first battery; First charging resistor 205, discharge and recharge two ends and produce voltage difference, indicator current; The connector of first battery interface 206, connection first battery; The 2nd N_MOS manages 207, controls its conducting or shutoff, decision discharging and recharging second battery; Second charging resistor 208, discharge and recharge two ends and produce voltage difference, indicator current; The connector of second battery interface 209, connection second battery; Digital to analog converter 210, the control signal (digital information) of microprocessor 212 is changed into corresponding level, and then the break-make of control P_MOS pipe the 203, the one N_MOS pipe the 204 and the 2nd N_MOS pipe 207; Analog to digital converter 211, detect the charging resistor both end voltage of each battery, change into digital information, send to microprocessor 212; The state of microprocessor 212, check and analysis charger and battery, the switching of rechargeable battery is controlled, reached to the selection of control system power supply energy, charging current.

Continue to consult Fig. 7, workflow of the present invention is:

One, insert the charger state:

The system delay certain hour, thus carry out battery voltage detection once more. and circulation is gone down, and extracts up to stopping charging or charger.

Two, powered battery state:

The system delay certain hour carries out battery voltage detection once more.Thereby circulation is gone down, and inserts up to system closedown or charger.

The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.