CN211405548U - Battery pack balancing circuit and battery power supply system - Google Patents
Battery pack balancing circuit and battery power supply system Download PDFInfo
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- CN211405548U CN211405548U CN202020211954.8U CN202020211954U CN211405548U CN 211405548 U CN211405548 U CN 211405548U CN 202020211954 U CN202020211954 U CN 202020211954U CN 211405548 U CN211405548 U CN 211405548U
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Abstract
The application is suitable for the technical field of batteries, and provides a battery pack balancing circuit and a battery power supply system, wherein the battery pack balancing circuit comprises a current limiting unit, a switch unit, a voltage acquisition unit and a control unit; the current limiting unit is connected with the switch unit in series and then connected with the battery pack in parallel, the voltage acquisition unit is connected with the battery pack, and the control unit is respectively connected with the voltage acquisition unit and the switch unit; the voltage acquisition unit is used for acquiring the real-time voltage of the battery pack, the control unit is used for comparing the real-time voltage with the preset voltage, and when the real-time voltage is larger than the preset voltage, the control unit controls the switch unit to be switched to a conduction state. The problem that the different influence life of a plurality of battery package electric quantities of establishing ties among the prior art has been solved to this application.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a battery package balanced circuit and battery power supply system.
Background
With the increasing awareness of environmental protection, secondary batteries capable of repeatedly storing energy are being greatly encouraged. For example, electric vehicles or hybrid electric vehicles, which are actively developed and propelled in various countries of the world, are typical examples. In addition, in order to drive a machine with a large voltage, such as the electric vehicle, a voltage of tens of volts to hundreds of volts is required, a single battery cannot be loaded, and a plurality of battery packs must be connected in series to form a series battery system to provide a sufficient voltage.
If a plurality of battery package before the series connection electric quantity is different, can cause the series connection back when charging, the battery package of low electric quantity can not be full of, and the battery package of high electric quantity is in the overcharge state for a long time, influences the life of battery package.
SUMMERY OF THE UTILITY MODEL
In view of this, the present disclosure provides a battery pack balancing circuit and a battery power supply system, so as to solve the problem that the service life of a plurality of battery packs connected in series is affected due to different electric quantities.
The application is realized by the following technical scheme:
in a first aspect, an embodiment of the present application provides a battery pack balancing circuit, which includes a current limiting unit, a switching unit, a voltage collecting unit, and a control unit; the current limiting unit is connected with the switch unit in series and then connected with the battery pack in parallel, the voltage acquisition unit is connected with the battery pack, and the control unit is respectively connected with the voltage acquisition unit and the switch unit;
the voltage acquisition unit is used for acquiring the real-time voltage of the battery pack, the control unit is used for comparing the real-time voltage with a preset voltage, and when the real-time voltage is greater than the preset voltage, the control unit controls the switch unit to be switched to a conduction state.
In one possible implementation manner of the first aspect, the current limiting unit includes a first resistor;
the first resistor is connected in series with the switch unit and then connected in parallel with the battery pack.
In a possible implementation manner of the first aspect, the current limiting unit further includes a second resistor, a third resistor, a first diode, a first triode, a second triode, and a voltage stabilizing chip;
the first end of the second resistor and the first end of the third resistor are connected with the positive electrode or the negative electrode of the battery pack, the second end of the second resistor is connected with the anode of the first diode, the second end of the third resistor is connected with the emitting electrode of the first triode, the cathode of the first diode is respectively connected with the base electrode of the first triode and the collector electrode of the second triode, the base electrode of the second triode is respectively connected with the collector electrode of the first triode and the second end of the voltage stabilizing chip, the emitting electrode of the second triode is respectively connected with the first end of the voltage stabilizing chip and the first end of the first resistor, and the third end of the voltage stabilizing chip is respectively connected with the second end of the first resistor and the switch unit.
In one possible implementation manner of the first aspect, the switch unit includes a switch tube;
the switch tube is connected with the current limiting unit in series and then connected with the battery pack in parallel, and the control end of the switch tube is connected with the control unit.
In a possible implementation manner of the first aspect, the voltage acquisition unit includes a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor;
the first end of the fourth resistor and the first end of the fifth resistor are respectively connected with the positive electrode and the negative electrode of the battery pack, the second end of the fourth resistor is respectively connected with the first end of the first capacitor and the control unit, the second end of the first capacitor is grounded, the second end of the fifth resistor is respectively connected with the first end of the second capacitor and the control unit, and the second end of the second capacitor is grounded.
In a possible implementation manner of the first aspect, the control unit includes a power control chip;
the output end of the power control chip is connected with the switch unit, and the first input end and the second input end of the power control chip are respectively connected with the two output ends of the voltage acquisition unit.
In one possible implementation manner of the first aspect, the voltage acquisition unit includes a sixth resistor and a third capacitor;
the first end of the sixth resistor is connected with the anode of the battery pack, the second end of the sixth resistor is respectively connected with the first end of the third capacitor and the control unit, and the second end of the third capacitor is grounded.
In one possible implementation manner of the first aspect, the control unit includes a reference voltage unit and a comparator;
the positive input end of the comparator is connected with the voltage acquisition unit, the negative input end of the comparator is connected with the reference voltage unit, and the output end of the comparator is connected with the switch unit.
In one possible implementation manner of the first aspect, the reference voltage unit includes a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with VCC, the second end of the seventh resistor is respectively connected with the first end of the eighth resistor and the negative input end of the comparator, and the second end of the eighth resistor is grounded.
In a second aspect, an embodiment of the present application provides a battery power supply system, which includes a plurality of battery packs connected in series in sequence, and each of the battery packs is connected in parallel to one of the battery pack balancing circuits of the first aspect.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the embodiment of the application, when charging to the battery package of a plurality of series connections, the voltage acquisition unit gathers the real-time voltage that corresponds the battery package, the control unit compares real-time voltage with preset voltage, when real-time voltage is greater than preset voltage, the control unit control switch unit is closed, current limiting unit and battery package form parallel circuit this moment, current limiting unit shunts, because total charging current is unchangeable, consequently, can reduce the charging current of battery package, reduce the charge rate of battery package, and the charge rate of other low-power battery packages is unchangeable, thereby realize the equalization control between each battery package.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic block diagram of a battery pack balancing circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit connection diagram of a battery pack balancing circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a battery pack balancing circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit connection diagram of a battery power supply system according to an embodiment of the present invention;
fig. 5 is a schematic circuit connection diagram of a battery power supply system according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The plurality of battery packs are connected in series to provide enough high voltage, if before the plurality of battery packs are connected in series, the battery packs have different electric quantities, and during subsequent charging, the battery packs with low electric quantities cannot be fully charged, and the battery packs with high electric quantities are always in an over-charging state, so that the problems of insufficient capacity and accelerated aging of the battery packs after the battery packs are connected in series are caused.
Based on the above problem, the embodiment of the application discloses a battery package balanced circuit, when charging a plurality of battery packages of establishing ties, the real-time voltage of corresponding battery package is gathered to the voltage acquisition unit, the control unit compares real-time voltage and preset voltage, when real-time voltage is greater than preset voltage, the control unit control switch unit is closed, current limiting unit and battery package form parallel circuit this moment, the current limiting unit shunts, because total charging current is unchangeable, consequently, can reduce the charging current of battery package, reduce the charge rate of battery package, and the charge rate of other low-power battery packages is unchangeable, thereby realize the balanced control between each battery package.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
Fig. 1 illustrates a schematic block diagram of a battery pack balancing circuit provided in an embodiment of the present application, which may include a current limiting unit 10, a switching unit 20, a voltage collecting unit 30, and a control unit 40; the current limiting unit 10 is connected in series with the switch unit 20 and then connected in parallel with the battery pack 50, the voltage acquisition unit 30 is connected with the battery pack 50, and the control unit 40 is connected with the voltage acquisition unit 30 and the switch unit 20 respectively.
Specifically, when a plurality of battery packs 50 connected in series are charged, the voltage acquisition unit 30 acquires real-time voltage corresponding to the battery packs 50, the control unit 40 compares the real-time voltage with preset voltage, when the real-time voltage is greater than the preset voltage, the control unit 40 controls the switch unit 20 to be closed, the current limiting unit 10 and the battery packs 50 form a parallel circuit at the moment, the current limiting unit 10 shunts current, and the total charging current is unchanged, so that the charging current of the battery packs 50 can be reduced, the charging speed of the battery packs 50 is reduced, and the charging speed of other low-power battery packs 50 is unchanged, thereby realizing balance control among the battery packs 50.
It should be noted that the preset voltage may be set according to actual needs, for example, an appropriate voltage value may be selected as the preset voltage in the vicinity of the rated voltage of the battery pack 50.
Fig. 2 is a schematic circuit connection diagram illustrating a balancing circuit of a battery pack according to an embodiment of the present disclosure, in which a current limiting unit 10 may include a first resistor R1; the first resistor R1 is connected in series with the switching unit 20 and then connected in parallel with the battery pack 50.
Specifically, the first resistor R1 is used for shunting to reduce the charging current corresponding to the battery pack 50, when the switch unit 20 is in the open state, the charging current of the charging power supply 60 to the battery pack 50 only passes through the battery pack 50, when the switch unit 20 is in the closed state, the first resistor R1 and the battery pack 50 form a parallel circuit, and the charging power supply 60 of the charging power supply 60 to the battery pack 50 simultaneously passes through the first resistor R1 and the battery pack 50, and since the total charging current is not changed, the first resistor R1 is divided into a part of power supplies, so that the charging current of the battery pack 50 can be reduced, and the charging speed of the battery pack 50 is reduced.
In an embodiment of the present application, the current limiting unit 10 may further include a second resistor R2, a third resistor R3, a first diode D1, a first triode Q1, a second triode Q2, and a voltage stabilizing chip VD 1; the first end of the second resistor R2 and the first end of the third resistor R3 are connected with the positive electrode or the negative electrode of the battery pack 50, the second end of the second resistor R2 is connected with the anode of the first diode D1, the second end of the third resistor R3 is connected with the emitter of the first triode Q1, the cathode of the first diode D1 is respectively connected with the base of the first triode Q1 and the collector of the second triode Q2, the base of the second triode Q2 is respectively connected with the collector of the first triode Q1 and the second end of the voltage stabilizing chip VD1, the emitter of the second triode Q2 is respectively connected with the first end of the voltage stabilizing chip VD1 and the first end of the first resistor R1, and the third end of the voltage stabilizing chip 1 is respectively connected with the second end of the first resistor R1 and the switch unit 20.
Specifically, the first resistor R1, the second resistor R2, the third resistor R3, the first diode D1, the first triode Q1, the second triode Q2, and the voltage stabilizing chip VD1 form a constant current control circuit, and the first end and the third end of the voltage stabilizing chip VD1 are respectively connected to two ends of the first resistor R1, so that the voltage loaded to two ends of the first resistor R1 is a constant voltage, and when the resistance value of the first resistor R1 is determined, the current flowing through the first resistor R1 is also determined accordingly, thereby implementing the constant current control of the current limiting unit 10. When the switch unit 20 is in a closed state, the current limiting unit 10 is connected in parallel with the battery pack 50, and the current of the charging current passing through the current limiting unit 10 is a constant set current, so that the constant current limitation on the battery pack 50 is realized, and the control accuracy on the battery pack 50 is improved.
In one embodiment of the present application, the switching unit 20 may include a switching tube Q3; the switching tube Q3 is connected in series with the current limiting unit 10 and then connected in parallel with the battery pack 50, and the control end of the switching tube Q3 is connected with the control unit 40.
Specifically, the switching tube Q3 performs switching between a closed state and an open state according to the control signal output by the control unit 40, and when the switching tube Q3 is in the open state, the current limiting unit 10 cannot form a closed loop, and at this time, the charging current only passes through the battery pack 50; when the switching tube Q3 is in a closed state, the current limiting unit 10 and the battery pack 50 form a parallel circuit, and the charging current passes through the current limiting unit 10 and the battery pack 50, and the current limiting unit 10 divides a part of the charging current, so as to reduce the charging current of the battery pack 50, and further slow down the charging speed of the battery pack 50.
Illustratively, the switching tube Q3 may be a field effect transistor, a drain of the field effect transistor is connected to the current limiting unit 10, a source of the field effect transistor is connected to the positive electrode or the negative electrode of the battery pack 50, and a gate of the field effect transistor is connected to the control unit 40. The control signal output by the control unit 40 may be a high level and a low level, and when the control unit 40 outputs the high level, the fet is turned on (i.e., the switching unit 20 is closed), and when the control unit 40 outputs the low level, the fet is turned off (i.e., the switching unit 20 is open).
In one embodiment of the present application, the voltage collecting unit 30 may include a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second capacitor C2; the first end of the fourth resistor R4 and the first end of the fifth resistor R5 are respectively connected to the anode and the cathode of the battery pack 50, the second end of the fourth resistor R4 is respectively connected to the first end of the first capacitor C1 and the control unit 40, the second end of the first capacitor C1 is grounded, the second end of the fifth resistor R5 is respectively connected to the first end of the second capacitor C2 and the control unit 40, and the second end of the second capacitor C2 is grounded.
Specifically, the fourth resistor R4 and the first capacitor C1 form a filter circuit, the filter circuit removes the alternating current part of the signal, and the control unit 40 can obtain the positive voltage or the negative voltage of the battery pack 50 through the fourth resistor R4; the fifth resistor R5 and the second capacitor C2 form a filter circuit, the filter circuit removes the ac part of the signal, and the control unit 40 obtains the negative voltage or the positive voltage of the battery pack 50 through the fifth resistor R5.
In one embodiment of the present application, the control unit 40 may include a power control chip U1; the output end of the power control chip U1 is connected with the switch unit 20, and the first input end and the second input end of the power control chip U1 are respectively connected with the two output ends of the voltage acquisition unit 30.
Specifically, two input terminals CS1 and CS2 of the power control chip U1 are respectively connected to two output terminals of the voltage acquisition unit 30, so as to obtain a real-time voltage of the battery pack 50, the power control chip U1 compares the real-time voltage of the battery pack 50 with a preset voltage, and when the real-time voltage of the battery pack 50 is greater than the preset voltage, the control switch unit 20 is controlled to switch to the on state by outputting a control signal through the C1 output terminal.
Fig. 3 shows a schematic circuit connection diagram of a battery pack balancing circuit provided in an embodiment of the present application, where a current limiting unit 10 and a switching unit 20 in the battery pack balancing circuit are the same as the current limiting unit 10 and the switching unit 20 in the embodiment of fig. 2.
The voltage collecting unit 30 in the embodiment of fig. 3 may include a sixth resistor R6 and a third capacitor C3; a first end of the sixth resistor R6 is connected to the positive electrode of the battery pack 50, a second end of the sixth resistor R6 is connected to the first end of the third capacitor C3 and the control unit 40, respectively, and a second end of the third capacitor C3 is grounded.
Specifically, the sixth resistor R6 and the third capacitor C3 form a filter circuit, and the control unit 40 obtains the real-time voltage of the positive electrode of the battery pack 50 through the sixth resistor R6.
In one embodiment of the present application, the control unit 40 may include a reference voltage unit and a comparator U2; the positive input end of the comparator U2 is connected with the voltage acquisition unit 30, the negative input end of the comparator U2 is connected with the reference voltage unit, and the output end of the comparator U2 is connected with the switch unit 20.
Specifically, according to actual needs, the reference voltage unit is designed to provide a set voltage, the comparator U2 outputs a corresponding control signal according to the set voltage and the real-time voltage of the positive electrode of the battery pack 50, and when the set voltage provided by the reference voltage unit is greater than the real-time voltage of the positive electrode of the battery pack 50, the comparator U2 outputs a low level, and the switch unit 20 is in an off state; when the set voltage provided by the reference voltage unit is less than the positive real-time voltage of the battery pack 50, the comparator U2 outputs a high level, and the switching unit 20 is switched to a closed state, and the current limiting unit 10 shunts the charging current of the battery pack 50.
For example, the reference voltage unit may include a seventh resistor R7 and an eighth resistor R8; the first end of the seventh resistor R7 is connected to VCC, the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8 and the negative input end of the comparator U2, respectively, and the second end of the eighth resistor R8 is grounded.
Specifically, the seventh resistor R7 and the eighth resistor R8 constitute a reference voltage unit, and the divided voltage of the eighth resistor R8 is a preset voltage. The setting of the preset voltage may be achieved by a voltage value of the power VCC, a resistance value of the seventh resistor R7, and a resistance value of the eighth resistor R8.
Fig. 4 shows a schematic circuit connection diagram of a battery power supply system provided by an embodiment of the present application, where the battery power supply system may include a charging power source 60 and a plurality of battery packs 50 connected in series, and each battery pack 50 is connected in parallel with a balancing circuit of the battery pack 50 shown in fig. 2.
The three battery packs 50 are connected in series for explanation, each battery pack 50 balancing circuit performs voltage detection and charging control on the battery packs 50 connected in parallel, in the charging process, when the voltage of one or more battery packs 50 reaches a preset voltage, the corresponding control unit 40 controls the switch unit 20 to be switched to the closed state, the current limiting unit 10 limits the current of the battery packs 50, the charging speed of the high-power battery pack 50 is reduced, and the charging speeds of other battery packs 50 which do not reach the preset voltage are unchanged, so that the electric quantity of the plurality of battery packs 50 is the same after the charging is completed, and the service life of the battery packs 50 is prolonged.
Fig. 5 is a schematic circuit diagram illustrating a battery power supply system according to an embodiment of the present disclosure, where the battery power supply system may include a charging power source 60 and a plurality of battery packs 50 connected in series, and each battery pack 50 is connected in parallel with a battery pack balancing circuit shown in fig. 3.
The three battery packs 50 are connected in series for explanation, each battery pack 50 balancing circuit performs voltage detection and charging control on the battery packs 50 connected in parallel, in the charging process, when the voltage of one or more battery packs 50 reaches a preset voltage, the corresponding control unit 40 controls the switch unit 20 to be switched to the closed state, the current limiting unit 10 limits the current of the battery packs 50, the charging speed of the high-power battery pack 50 is reduced, and the charging speeds of other battery packs 50 which do not reach the preset voltage are unchanged, so that the electric quantity of the plurality of battery packs 50 is the same after the charging is completed, and the service life of the battery packs 50 is prolonged.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A battery pack balancing circuit is characterized by comprising a current limiting unit, a switch unit, a voltage acquisition unit and a control unit; the current limiting unit is connected with the switch unit in series and then connected with the battery pack in parallel, the voltage acquisition unit is connected with the battery pack, and the control unit is respectively connected with the voltage acquisition unit and the switch unit;
the voltage acquisition unit is used for acquiring the real-time voltage of the battery pack, the control unit is used for comparing the real-time voltage with a preset voltage, and when the real-time voltage is greater than the preset voltage, the control unit controls the switch unit to be switched to a conduction state.
2. The battery pack balancing circuit of claim 1, wherein the current limiting unit comprises a first resistor;
the first resistor is connected in series with the switch unit and then connected in parallel with the battery pack.
3. The battery pack balancing circuit of claim 2, wherein the current limiting unit further comprises a second resistor, a third resistor, a first diode, a first triode, a second triode, and a voltage stabilizing chip;
the first end of the second resistor and the first end of the third resistor are connected with the positive electrode or the negative electrode of the battery pack, the second end of the second resistor is connected with the anode of the first diode, the second end of the third resistor is connected with the emitting electrode of the first triode, the cathode of the first diode is respectively connected with the base electrode of the first triode and the collector electrode of the second triode, the base electrode of the second triode is respectively connected with the collector electrode of the first triode and the second end of the voltage stabilizing chip, the emitting electrode of the second triode is respectively connected with the first end of the voltage stabilizing chip and the first end of the first resistor, and the third end of the voltage stabilizing chip is respectively connected with the second end of the first resistor and the switch unit.
4. The battery pack balancing circuit of claim 1, wherein the switching unit comprises a switching tube;
the switch tube is connected with the current limiting unit in series and then connected with the battery pack in parallel, and the control end of the switch tube is connected with the control unit.
5. The battery pack balancing circuit according to any one of claims 1 to 4, wherein the voltage acquisition unit includes a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor;
the first end of the fourth resistor and the first end of the fifth resistor are respectively connected with the positive electrode and the negative electrode of the battery pack, the second end of the fourth resistor is respectively connected with the first end of the first capacitor and the control unit, the second end of the first capacitor is grounded, the second end of the fifth resistor is respectively connected with the first end of the second capacitor and the control unit, and the second end of the second capacitor is grounded.
6. The battery pack balancing circuit of claim 5, wherein the control unit includes a power control chip;
the output end of the power control chip is connected with the switch unit, and the first input end and the second input end of the power control chip are respectively connected with the two output ends of the voltage acquisition unit.
7. The battery pack balancing circuit according to any one of claims 1 to 4, wherein the voltage acquisition unit includes a sixth resistor and a third capacitor;
the first end of the sixth resistor is connected with the anode of the battery pack, the second end of the sixth resistor is respectively connected with the first end of the third capacitor and the control unit, and the second end of the third capacitor is grounded.
8. The battery pack balancing circuit of claim 7, wherein the control unit includes a reference voltage unit and a comparator;
the positive input end of the comparator is connected with the voltage acquisition unit, the negative input end of the comparator is connected with the reference voltage unit, and the output end of the comparator is connected with the switch unit.
9. The battery pack balancing circuit of claim 8, wherein the reference voltage unit includes a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with VCC, the second end of the seventh resistor is respectively connected with the first end of the eighth resistor and the negative input end of the comparator, and the second end of the eighth resistor is grounded.
10. A battery power supply system comprising a plurality of battery packs connected in series, each of said battery packs being connected in parallel with a battery pack balancing circuit according to any one of claims 1 to 9.
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| CN202020211954.8U CN211405548U (en) | 2020-02-25 | 2020-02-25 | Battery pack balancing circuit and battery power supply system |
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| CN202020211954.8U CN211405548U (en) | 2020-02-25 | 2020-02-25 | Battery pack balancing circuit and battery power supply system |
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