TWI795943B - Battery management method and battery management system - Google Patents

Abstract

A battery management method and a battery management system are provided. The battery management system includes a voltage detection module, a setting module, a discharging module, a driving module, and a starting module. The voltage detection module obtains a voltage of each of batteries. The setting module sets a target value based on the minimum voltage. The discharging module is driven to discharge the batteries, so that the voltages are lower than the target value. The driving module drives the discharging module when the difference between the minimum voltage and the maximum voltage is greater than the difference between the target value and the minimum voltage. The starting module starts the driving module when the minimum voltage is lower than a starting threshold, or the difference between the second smallest voltage and the minimum voltage is greater than and equal to the maximum voltage and the minimum voltage. Accordingly, the service life of batteries can be extended.

Description

Battery management method and battery management system

The invention relates to a management method and a management system, in particular to a battery management method and a battery management system.

Because the electrochemical characteristics and internal resistance nonlinearity of each battery are different, or the operating environment conditions are different, the electrical properties of each battery are different. This makes when these batteries are used in series and parallel, some of the batteries may have been overcharged during charging, but the other part of the batteries may be undercharged, resulting in unexpected wear and tear of the battery pack and accelerated deterioration.

Therefore, the inventor believes that the above-mentioned defects can be improved, Naite devoted himself to research and combined with the application of scientific principles, and finally proposed an invention with reasonable design and effective improvement of the above-mentioned defects.

The technical problem to be solved by the present invention is "how to balance the voltages among the batteries to prolong the service life", and provides a battery management method and a battery management system aiming at the deficiencies of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a battery management method, which is suitable for a battery management system that manages a battery pack, the battery pack has multiple batteries, and the management method includes The following steps: Obtain multiple multiples of the batteries A battery voltage; wherein, the battery voltage with the smallest value is defined as a minimum battery voltage, and the other battery voltages are defined as an adjusted battery voltage; using the minimum battery voltage and a plurality of the adjusted battery voltages to set a a target value, the target value being between the adjusted battery voltage with the largest value and the lowest battery voltage; The battery is discharged, so that a plurality of the adjusted battery voltages are lower than the target value; the unbalanced condition includes a driving condition, and the driving condition is: the lowest battery voltage and the adjusted battery voltage with the largest value The difference between is greater than the difference between the target value and the minimum battery voltage.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a battery management system for managing a battery pack, the battery pack has a plurality of batteries, the battery management system includes: a voltage detector The detection module is used to electrically couple a plurality of the batteries, and the voltage detection module can obtain a battery voltage of each of the batteries; wherein, the battery voltage with the smallest value is defined as a minimum battery voltage, and the other Each of the battery voltages is defined as an adjusted battery voltage; a setting module is electrically coupled to the voltage detection module, and the setting module is set according to the minimum battery voltage and a plurality of the adjusted battery voltages a target value, and the target value is between the adjusted battery voltage with the largest value and the minimum battery voltage; a discharge module, used to electrically couple a plurality of the batteries and electrically couple the A setting module, the discharge module can be driven to discharge the batteries corresponding to the adjusted battery voltages, so that the adjusted battery voltages are lower than the target value; a driving module, Electrically coupled to the voltage detection module, the setting module and the discharge module, when the difference between the adjusted battery voltage with the largest value and the minimum battery voltage is greater than the target value When the difference between the minimum battery voltage and the minimum battery voltage, the driving module drives the discharging module; a starting module is electrically coupled to the voltage detection module and the driving module, the When the starting module meets a threshold condition, the starting module can start the driving module, so that the driving module can drive the discharging module; wherein, the threshold condition is: the smallest value The difference between the adjusted battery voltage and the lowest battery voltage is not less than the difference between the adjusted battery voltage with the largest value and the adjusted battery voltage with the smallest value, or the lowest battery voltage is lower than a start-up threshold.

In summary, the battery management method and battery management system disclosed in the embodiments of the present invention can set the target value by using the lowest battery voltage, and the target value is between the adjusted battery voltage with the largest value. and the minimum battery voltage" and "discharge the multiple batteries corresponding to the multiple adjusted battery voltages, so that the multiple adjusted battery voltages are lower than the target value", so that battery management The method and the battery management system can effectively reduce the voltage difference between the batteries, so as to achieve the voltage balance among the batteries and prolong the service life.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

100:Battery Management System

1: Voltage detection module

2: Set the module

3: Discharge module

4: Driver module

5: Start the module

6: Execute the module in batches

200: battery pack

210: battery

S100, S100’: Management methods

S101~S111, S105': steps

S1111~S1113: sub-steps

FIG. 1 is a schematic block diagram of a battery management system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of time voltage of a plurality of batteries according to the first embodiment of the present invention.

FIG. 3 is a schematic flowchart of steps of a battery management method according to a second embodiment of the present invention.

FIG. 4 is a schematic flowchart of the sub-steps of the battery management method according to the second embodiment of the present invention.

FIG. 5 is a schematic flowchart of steps of a battery management method according to a third embodiment of the present invention.

The following is an illustration of the implementation of the "battery management method and battery management system" disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another element, or one signal from another signal. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[first embodiment]

1 to 2, the present embodiment provides a battery management system 100, the battery management system 100 can be used to manage a battery pack 200 with a plurality of batteries 210, so that the voltages of the batteries 210 can be compared with each other balance.

As shown in FIG. 1 to FIG. 2 , the battery management system 100 includes a voltage detection module 1 for electrically coupling a plurality of the batteries 210 , and a voltage detection module 1 electrically coupled to the voltage detection module 1 . The setting module 2 is used to electrically couple a plurality of the batteries 210 and a discharge module 3 electrically coupled to the setting module 2, electrically coupled to the voltage detection module 1, and the setting The module 2 and a driving module 4 of the discharging module 3 , and a starting module 5 electrically coupled to the voltage detection module 1 and the driving module 4 .

The voltage detection module 1 can obtain a battery voltage of each of the batteries 210 . In practical applications, the voltage detection module 1 includes a plurality of voltage sensors (Voltage Sensor), each of the voltage sensors is electrically coupled to one of the batteries 210, and each of the voltage sensors can obtain the corresponding battery voltage through the principle of resistance voltage division, but the present invention is not limited thereto this. For example, the voltage detection module 1 may also be an element using the principle of thermal radiation, so as to obtain the battery voltage of each of the batteries 210 . In addition, for the convenience of subsequent description, the battery voltage with the smallest value is defined as a minimum battery voltage, and the other battery voltages are defined as an adjusted battery voltage.

The setting module 2 can set a target value according to the minimum battery voltage, and the target value is between the adjusted battery voltage with the largest value and the minimum battery voltage. In practical applications, the setting module 2 can be a single module or chip (for example: MPU) with calculation and storage functions, and the setting module 2 can obtain the battery voltage of each of the batteries 210, so that Set the target value. In a preferred situation, the target value is preferably between an average value of the adjusted battery voltage with the largest value and the minimum battery voltage to the minimum battery voltage. Certainly, in a preferred embodiment, the target value may be designed to be between the adjusted battery voltage with the minimum value and an average value of the minimum battery voltage to the minimum battery voltage.

For ease of understanding, an example is given below for illustration, but the present invention is not limited thereto. As shown in FIG. 2 , assuming that the plurality of battery voltages obtained by the voltage detection module 1 in the 5th second are 3.25 volts, 3.30 volts, 3.29 volts, 3.31, 3.305 volts, the corresponding 3.25 volts The battery voltage is the lowest battery voltage, and the battery voltage corresponding to 3.31 volts is the adjusted battery voltage with the largest value. Therefore, the maximum setting range of the target value set by the setting module 2 in this example is between 3.25 volts and 3.31 volts, and the best setting range is between 3.25 volts and 3.28 volts ( That is, between (3.31+3.25)/2 volts). In practice, the target value can be properly adjusted according to the designer, but the target value must be within the aforementioned maximum setting range, that is, between the adjusted battery voltage with the largest value and the minimum battery voltage.

The discharge module 3 can be driven by the drive module 4 to correspond to a plurality of The batteries 210 with the adjusted battery voltages are discharged, so that the voltages of a plurality of the adjusted batteries are lower than the target value. In practical applications, the discharge module 3 includes multiple single-cut circuits and multiple discharge circuits electrically coupled to multiple batteries 210, and the multiple single-cut circuits and multiple discharge circuits can Cooperating with each other, any one of the batteries 210 can be discharged individually. Wherein, the discharge module 3 discharges any one of the batteries 210 in the prior art, and will not be specifically limited and described in detail here.

The drive module 4 in this embodiment can be a single module or chip (for example: MPU) with calculation and storage functions, and the drive module 4 operates between the adjusted battery voltage and the minimum battery voltage with the largest value. When the difference between them is greater than the difference between the target value and the minimum battery voltage, the driving module 4 can drive the discharging module 3 .

The startup module 5 in this embodiment can be a single module or chip (for example: MPU) with computing and storage functions, or the startup module 5, the drive module 4 and the setting module 2 are integrated into the same module or chip. When the starting module 5 meets a threshold condition, the starting module 5 can start the driving module 4 . Wherein, the threshold condition can be selected according to the requirements of the designer: (1) at the same time point, the difference between the adjusted battery voltage with the smallest value and the lowest battery voltage is not less than the adjusted battery with the largest value The difference between the voltage and the adjusted battery voltage with the smallest value (hereinafter referred to as the first threshold condition), or (2) the minimum battery voltage is lower than a startup threshold (hereinafter referred to as the second threshold condition ). In practice, the starting threshold is preferably the voltage threshold when the battery pack 200 starts discharging or stands still.

For ease of understanding, as shown in Fig. 2, the starting threshold value at the 5th second is 3.26 volts, the target value is 3.275 volts, and the multiple battery voltages are 3.25 volts (that is, the lowest battery voltage is 3.25 volts). voltage), 3.31 volts (that is, the adjusted battery voltage with the largest value), 3.29 volts (that is, the adjusted battery voltage with the smallest value), 3.30 volts, and 3.305 volts The example illustrates the driving module 4 and the starting module 5, but the present invention is not limited thereto.

At the same time point, the difference between the adjusted battery voltage with the smallest detected value and the lowest battery voltage (ie, 3.29-3.25=0.04) detected by the starting module 5 is not less than the largest adjusted battery When the difference between the voltage and the adjusted battery voltage with the smallest value (ie, 3.31-3.29=0.02), the starting module 5 satisfies the first threshold condition and can start the driving module 4 .

When the starting module 5 detects that the minimum battery voltage (ie, 3.25 volts) is less than the starting threshold (ie, 3.26 volts), the starting module 5 satisfies the second threshold condition and can start all Describe the drive module 4.

Accordingly, the difference between the adjusted battery voltage with the largest value and the minimum battery voltage (that is, 3.31-3.25=0.06) of the driving module 4 is greater than the difference between the target value and the minimum battery voltage When there is a difference between them (that is, 3.275-3.25=0.025), the driving module 4 can drive the discharging module 3 .

Then, when the discharge module 3 is driven, it will discharge the batteries 210 corresponding to 3.31 volts, 3.29 volts, 3.30 volts, and 3.305 volts (that is, multiple adjusted battery voltages), so that multiple The adjusted battery voltage is below 3.275 volts (ie, the target value). Accordingly, after the battery pack 200 is voltage balanced by the battery management system 100, the battery voltage of each of the batteries 210 will be approximately between 3.25 volts and 3.275 volts, which makes the battery pack 200 Originally the maximum voltage difference value of 0.06 volts (ie, 3.31-3.25=0.06) is greatly reduced to 0.025 volts (ie, 3.275-3.25=0.025), so as to effectively balance the voltages of a plurality of the batteries 210, thereby prolonging the battery pack 200 lifespan.

Of course, in practical applications, the designer can also adjust the activation module 5 to activate the driving module 4 only when the first threshold condition and the second threshold condition are met. This can make the starting module 5 avoid misjudgment.

In another preferred embodiment, the battery management system 100 can further include a batch execution module 6, the batch execution module 6 is electrically coupled to the discharge module 3 and the drive module 4 , when the said batch execution module 6 drives the discharge module 3 by the driving module 4, the batch execution module 6 can control the discharge module 3 to each pair of odd or even numbers. The adjusted battery voltage is discharged, and then the remaining adjusted battery voltages are discharged.

That is to say, assuming that the plurality of batteries 210 of the battery pack 200 are numbered as No. 1 battery, No. 2 battery, No. 3 battery, No. 4 battery, and No. 5 battery according to the serial connection sequence, the The batch execution module 6 can control the discharge module 3 to discharge the No. 2 battery and the No. 4 battery with even numbers, and stop discharging when the discharge time reaches a set time. Next, the batch execution module 6 controls the discharge module 3 to discharge the No. 1 battery, the No. 3 battery, and the No. 5 battery whose numbers are odd, and stop discharging when the discharge time reaches a set time. . The two interact to make the adjusted battery voltage lower than the target value. Certainly, the batch execution module 6 may first discharge the odd-numbered batteries, and then discharge the even-numbered batteries, and the present invention is not limited thereto.

Accordingly, the battery management system 100 can effectively ensure that the adjacent batteries 210 can be discharged independently without affecting each other's voltages through the batch execution module 6 . In addition, when a plurality of odd-numbered and even-numbered batteries 210 are discharged separately, the battery pack 200 can also effectively disperse heat energy generated during the discharge.

[Second embodiment]

As shown in FIG. 3 to FIG. 4, it is the second embodiment of the present invention. This embodiment provides a battery management method S100, and the management method S100 is applicable to the battery management system 100 of the first embodiment, so please Match the content shown in Figure 1 to Figure 2 in due course. Of course, the management method S100 is also applicable to other battery management systems for managing battery packs.

In addition, for the convenience of description, the battery management method S100 will be introduced first below. spirit of the invention, and then introduce one of the embodiments of the battery management method S100 in practical applications. The inventive spirit of the management method S100 includes the following steps: obtaining multiple battery voltages of multiple batteries 210, the battery voltage with the smallest value is defined as a minimum battery voltage, and the other battery voltages are defined as an adjustment battery voltage.

A target value is set by using the lowest battery voltage and a plurality of the adjusted battery voltages, and the target value is preferably between the adjusted battery voltage with the largest value and the lowest battery voltage.

When an unbalanced condition is satisfied, discharge the plurality of batteries 210 respectively corresponding to the plurality of adjusted battery voltages, so that the plurality of adjusted battery voltages are lower than the target value. Wherein, the unbalanced condition includes a driving condition, and the driving condition is: the difference between the lowest battery voltage and the adjusted battery voltage with the largest value is greater than the difference between the target value and the lowest battery voltage difference.

In another preferred situation, the unbalanced condition further includes an activation condition and a threshold condition. That is to say, the unbalanced condition satisfies the driving condition, the starting condition, and the threshold condition simultaneously, but the present invention is not limited thereto.

For example, the unbalanced condition may be: only the driving condition and the start-up condition are satisfied at the same time, or only the driving condition and the threshold condition are satisfied at the same time.

Further, in this embodiment, the starting condition is: the difference between the adjusted battery voltage with the largest value and the minimum battery voltage is greater than the difference between the target value and the minimum battery voltage value. The threshold condition is: the minimum battery voltage is lower than a starting threshold; wherein, the starting threshold is the voltage threshold when the battery pack 200 starts discharging or resting, but the present invention is not limited to this.

Next, the actual application of the battery management method S100 will be introduced below. One of the embodiments, and the unbalanced condition shown in this embodiment is that the driving condition, the starting condition and the threshold condition are satisfied at the same time. In addition, the following steps can be reasonably adjusted or omitted according to the needs of the designer, and the present invention is not limited thereto.

As shown in Figure 3, the management method S100 includes steps S101 to S111, but in actual application, one of the above steps S101 to S111 can be omitted or changed in a reasonable manner depending on the needs of the designer replace.

Implementing the step S101: obtaining a plurality of battery voltages. Specifically, each of the battery voltages is the voltage of each of the batteries 210 of the battery pack 200, wherein the battery voltage with the smallest value is defined as a minimum battery voltage, and the other battery voltages are defined as 1. Adjust the battery voltage.

Implementing the step S103: using the minimum battery voltage and a plurality of the adjusted battery voltages to set a target value, and the target value is between the adjusted battery voltage with the largest value and the minimum battery voltage. Wherein, the target value is preferably between an average value of the adjusted battery voltage with the largest value and the minimum battery voltage to the minimum battery voltage.

Certainly, in a preferred embodiment, the target value may be designed to be between the adjusted battery voltage with the minimum value and an average value of the minimum battery voltage to the minimum battery voltage.

Implementing the step S105: judging whether the minimum battery voltage is lower than a starting threshold (ie, the threshold condition). If yes, proceed to the following steps; if not, re-execute the acquiring step S101. But the present invention is not limited thereto.

Implementing the step S107: at the same time point, determine whether the difference between the adjusted battery voltage with the largest value and the minimum battery voltage is greater than the difference between the target value and the minimum battery voltage ( That is, the start condition). If yes, proceed to the following steps; if not, re-execute the step S101.

Implementing the step S109: judging the lowest battery voltage and the battery with the largest value Whether the difference between the adjusted battery voltages is larger than the difference between the target value and the minimum battery voltage (ie, the driving condition). If yes, proceed to the following steps; if not, re-execute the step S101.

Implementing the step S111: discharging the multiple batteries 210 corresponding to the multiple adjusted battery voltages, so that the multiple adjusted battery voltages are lower than the target value.

Accordingly, the management method S100 can greatly reduce the maximum voltage difference of each of the batteries 210 , thereby effectively balancing the voltages of the plurality of batteries 210 to prolong the life of the battery pack 200 .

As shown in FIG. 4 , in another preferred embodiment, in order to ensure that the adjacent batteries 210 can be discharged independently without affecting each other's voltages. In the discharge of the multiple batteries corresponding to the multiple adjusted battery voltages, so that the multiple adjusted battery voltages are lower than the target value (that is, the step S111), the management method S100 further includes sub-steps S1111 to S1113.

Implementing the sub-step S1111: sequentially defining a serial number of the battery 210 corresponding to each of the adjusted battery voltages, and a plurality of the serial numbers are arranged as a string of odd numbers and even numbers interlaced. For example, each of the batteries 210 is defined as a No. 1 battery, a No. 2 battery, a No. 3 battery, a No. 4 battery, and a No. 5 battery.

Implementing the sub-step S1112: selecting the batteries 210 corresponding to a plurality of odd numbers to discharge, so as to adjust the battery voltage for a set time. For example: discharge No. 1 battery, No. 3 battery, and No. 5 battery to adjust the battery voltage for 30 seconds (ie, the set time).

Implementing the sub-step S1113: selecting a plurality of even-numbered batteries 210 corresponding to the numbers to discharge, so as to adjust the battery voltage for the set time. For example: discharge the No. 2 battery and the No. 4 battery to adjust the battery voltage for 30 seconds (that is, the set time).

Accordingly, the sub-step S1112 and the sub-step S1113 interact to make the adjusted battery voltage lower than the target value. Certainly, the execution order of the sub-steps S1112 and the sub-steps S1113 can be adjusted arbitrarily according to the requirements of the designer, which is not particularly limited in the present invention.

[Third embodiment]

As shown in Figure 5, it is the third embodiment of the present invention, the management method S100' of this embodiment is similar to the management method S100 of the second embodiment above, and the similarities between the two embodiments will not be repeated, and The difference between the management method S100' of this embodiment and the management method S100 of the second embodiment mainly lies in: Specifically, in this embodiment, the step S105' is: at the same time point, determine whether the difference between the adjusted battery voltage with the smallest value and the minimum battery voltage is not smaller than the adjusted battery voltage with the largest value. The difference between the adjusted battery voltage and the adjusted battery voltage with the smallest value (that is, the threshold condition). If yes, continue to execute the step S107; if not, re-execute the step S101.

That is to say, the step S105' is to determine whether to execute the next step S107 when there is a significant voltage difference between the lowest battery voltage and the other adjusted battery voltages.

As shown in FIG. 2, FIG. 2 is a time-voltage diagram of a plurality of batteries 210, when the adjusted battery voltage with the smallest value is between the minimum battery voltage (that is, the two battery voltages with the smallest value) When the difference between them is not less than the difference between the adjusted battery voltages with the largest and smallest values, there will be a significant voltage difference between the lowest battery voltage and the other adjusted battery voltages, that is, the The multiple cells 210 of the battery pack 200 need to balance voltages. Accordingly, the management method S100' can proceed to the next step S107~step S111 and so on.

[Technical effects of the embodiments of the present invention]

In summary, the battery management method and battery management system disclosed in the embodiments of the present invention system, can be achieved by "using the minimum battery voltage to set the target value, and the target value is between the adjusted battery voltage with the largest value and the lowest battery voltage" and "for a plurality of the adjusted batteries The multiple batteries corresponding to the voltages are discharged, so that the multiple adjusted battery voltages are lower than the target value", so that the battery management method and the battery management system can effectively reduce the voltage difference between the batteries, thereby Achieving voltage balance between cells for longer life.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

S100: Management method

S101~S111: steps

Claims (9)

A battery management method, suitable for a battery management system that manages a battery pack, the battery pack has a plurality of batteries, the management method includes the following steps: obtaining a plurality of battery voltages of the plurality of batteries; wherein the value is the smallest The battery voltage is defined as a minimum battery voltage, and the other battery voltages are defined as an adjusted battery voltage; a target value is set by using the minimum battery voltage and a plurality of the adjusted battery voltages, and the target value is between between the adjusted battery voltage with the largest value and the lowest battery voltage; and when an unbalanced condition is met, discharge the plurality of batteries corresponding to the adjusted battery voltages, so that the plurality of adjusted battery voltages The adjusted battery voltage is lower than the target value; the unbalanced condition includes a driving condition, the driving condition is: the difference between the lowest battery voltage and the adjusted battery voltage with the largest value is greater than the The difference between the target value and the minimum battery voltage; wherein, the unbalanced condition further includes a threshold condition, and the threshold condition is: the difference between the adjusted battery voltage with the smallest value and the minimum battery voltage The difference is not smaller than the difference between the adjusted battery voltage with the largest value and the adjusted battery voltage with the smallest value. The battery management method according to claim 1, wherein the unbalanced condition further includes a start condition, and the start condition is: the difference between the adjusted battery voltage with the largest value and the minimum battery voltage is greater than The difference between the target value and the minimum battery voltage. The battery management method according to claim 2, wherein the unbalanced condition is also A threshold condition is included, and the threshold condition is: the minimum battery voltage is lower than a starting threshold; wherein, the starting threshold is a voltage threshold when the battery pack starts discharging or resting. The battery management method according to claim 2, wherein the unbalanced condition further includes a threshold condition, and the threshold condition is: the difference between the adjusted battery voltage with the smallest value and the minimum battery voltage is not less than the difference between the adjusted battery voltage with the largest value and the adjusted battery voltage with the smallest value. The battery management method according to claim 1, wherein the unbalanced condition further includes a threshold condition, and the threshold condition is: the minimum battery voltage is lower than a start-up threshold; wherein the start-up threshold is The voltage threshold when the battery pack starts discharging or rests. The battery management method according to claim 1, wherein when discharging the plurality of batteries corresponding to the plurality of adjusted battery voltages so that the plurality of adjusted battery voltages are lower than the target value, The management method further includes: sequentially defining a serial number of the battery corresponding to each of the adjusted battery voltages, and a plurality of the serial numbers are arranged as odd and even number strings; selecting a plurality of odd serial numbers The corresponding battery is discharged so that the adjusted battery voltage is lower than the target value; and the batteries corresponding to a plurality of even numbers are selected to be discharged so that the adjusted battery voltage is lower than the target value value. The battery management method according to claim 1, wherein the target value is an average value between the adjusted battery voltage with the largest value and the minimum battery voltage to between the minimum battery voltages. A battery management system is used to manage a battery pack, the battery pack has a plurality of batteries, the battery management system includes: a voltage detection module, used to electrically couple a plurality of the batteries, the voltage detection module The measuring module group can obtain a battery voltage of each of the batteries; wherein, the battery voltage with the smallest value is defined as a minimum battery voltage, and the other battery voltages are defined as an adjusted battery voltage; a setting module, the battery Sexually coupled to the voltage detection module, the setting module sets a target value according to the minimum battery voltage and a plurality of the adjusted battery voltages, and the target value is between the adjusted battery voltage with the largest value and the lowest battery voltage; a discharge module, used to electrically couple a plurality of the batteries and electrically couple the setting module, the discharge module can be driven to correspond to a plurality of the set Discharging the battery with the adjusted battery voltage, so that the voltage of a plurality of the adjusted batteries is lower than the target value; a driving module, electrically coupled to the voltage detection module, the setting module and the In the discharging module, when the difference between the adjusted battery voltage with the largest value and the minimum battery voltage is greater than the difference between the target value and the minimum battery voltage, the driving module drives The discharging module; a starting module, electrically coupled to the voltage detection module and the driving module, when the starting module meets a threshold condition, the starting module can start the driving the module, so that the driving module drives the discharging module; wherein, the threshold condition is: the difference between the adjusted battery voltage with the smallest value and the minimum battery voltage is not less than the adjusted battery voltage with the largest value. Adjust the battery voltage and value as described above The difference between the adjusted battery voltages is small, or the minimum battery voltage is below an activation threshold. The battery management system as described in claim 8, wherein the battery management system further includes a sub-execution module, the sub-execution module is electrically coupled to the discharge module and the driving module, When the batch execution module is driven, the batch execution module can control the discharge module to discharge each of the adjusted battery voltages whose order is odd or even, and then discharge the remaining Under each of the above adjustments the battery voltage is discharged.

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