Battery management circuit and system integrated with active and passive equalization

Abstract

The utility model relates to a battery management circuit and system integrated with active and passive equalization. In the circuit, a first switch, an equalization resistor and a single battery cell of the same passive equalization control unit are connected in series; the second switch and the third switch of the same active equalization control unit are connected in series with the single cells; the controller is connected with the first switches, the second switches and the third switches. When the voltage of any single battery cell is higher than a first threshold voltage, the corresponding first switch is closed, so that the single battery cell discharges to release energy, and the voltage reduction of the single battery cell is realized; when the voltage of the single battery cell is lower than a second threshold voltage, the corresponding second switch and the third switch are closed, the single battery cell is charged through the power supply module, the single battery cell is boosted, the switch control structure and the control process of active equalization and passive equalization are simplified, active equalization and passive equalization can be synchronously controlled at the same time, and the service life of the battery cell is prolonged. Battery cores of the battery pack are in a consistent state and the cycle life of the battery pack is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, in particular to a battery management circuit and system integrating active and passive equalization. BACKGROUND

[0002] In a battery pack, due to the difference in electrochemical characteristics (such as self-discharge rate, charge-discharge life, etc.) of each cell, the consistency of the cells becomes worse and the difference becomes larger after the battery is operated for a period of time, which seriously affects the cycle life of the battery pack. Usually, passive equalization is used to discharge the single voltage of the cell with high remaining capacity through the passive equalization circuit to maintain the consistency of the cell, but it cannot take measures for the cell with low voltage, which still affects the consistency of the cell; there is also an active equalization method to charge the single voltage of the cell with low remaining capacity through the active equalization circuit to maintain the consistency of the cell, but the active equalization circuit cannot be synchronized with the passive equalization to ensure the voltage reduction process of the cell with high voltage, which still affects the consistency of the cell, thereby affecting the cycle life of the battery pack.

[0003] In the existing battery pack equalization method integrating active and passive equalization, a complex switch control structure is usually used to realize the active and passive equalization control of the battery pack, resulting in high cost and complicated control process of the system. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide a battery management circuit and system integrating active and passive equalization to simplify the switch control structure and control process of active and passive equalization of the system, and to simultaneously control the active and passive equalization to keep the cells of the battery pack in a consistent state and improve the cycle life of the battery pack.

[0005] In a first aspect, the present application provides a battery management circuit integrating active and passive equalization, comprising:

[0006] a battery pack, the battery pack comprising a plurality of single cells connected in series;

[0007] a first control circuit, the first control circuit comprising a plurality of passive equalization control units, each passive equalization control unit being connected one-to-one with each single cell; the passive equalization control unit comprising a first switch and an equalization resistor; the first switch and the equalization resistor of the same passive equalization control unit being connected in series with the corresponding single cell;

[0008] A second control loop, the second control loop comprising a power module and a plurality of active balancing control units, each active balancing control unit corresponding to one single battery cell; the active balancing control unit comprising a second switch and a third switch; the power module, the second switch and the third switch of the same active balancing control unit being connected in series with the corresponding single battery cell;

[0009] A controller, the controller being connected to each first switch, each second switch and each third switch respectively.

[0010] In one of the embodiments, the first signal end of the first switch is connected to the first end of the balancing resistor of the same passive balancing control unit, the second signal end of the first switch is connected to the negative pole of the corresponding single battery cell, and the control end of the first switch is connected to the controller; the second end of the balancing resistor is connected to the positive pole of the corresponding single battery cell.

[0011] The first signal end of the second switch is connected to the positive pole of the corresponding single battery cell, the second signal end of the second switch is connected to the first end of the power module, and the control end of the second switch is connected to the controller.

[0012] The first signal end of the third switch is connected to the negative pole of the corresponding single battery cell, the second signal end of the third switch is connected to the second end of the power module, and the control end of the third switch is connected to the controller.

[0013] In one of the embodiments, the power module comprises a constant current and constant voltage regulating circuit and a power isolation circuit.

[0014] The first output end of the constant current and constant voltage regulating circuit is connected to the second signal end of each second switch respectively, the second output end of the constant current and constant voltage regulating circuit is connected to the second signal end of each third switch respectively, the input end of the constant current and constant voltage regulating circuit is connected to the output end of the power isolation circuit, and the input end of the power isolation circuit is used for connecting an input power supply.

[0015] In one of the embodiments, the power module further comprises a power interface module.

[0016] The power interface module is connected to the input end of the power isolation circuit, and the power interface module is connected to the input power supply.

[0017] In one of the embodiments, a prompt module is further included, and the prompt module is connected to the controller.

[0018] In one of the embodiments, the prompt module comprises a plurality of light emitting elements, each light emitting element is arranged corresponding to one single battery cell, and each light emitting element is connected to the controller respectively.

[0019] In one of the embodiments, a wireless communication module is further included, and the wireless communication module is connected to the controller.

[0020] In one of the embodiments, a display is further included, and the display is connected to the controller.

[0021] In one of the embodiments, the single battery cell is a lithium ion battery cell.

[0022] In a second aspect, the application further provides a battery management system integrated with active and passive equalization, comprising the battery management circuit integrated with active and passive equalization according to any one of the above.

[0023] One of the above technical solutions has the following advantages and beneficial effects:

[0024] In the above integrated active and passive equalization battery management circuit, the battery pack, the first control loop, the second control loop and the controller are included; the battery pack includes a plurality of single battery cells connected in series; the first control loop includes a plurality of passive equalization control units, each passive equalization control unit is connected to each single battery cell in one-to-one correspondence; the passive equalization control unit includes a first switch and an equalization resistor; the first switch and the equalization resistor of the same passive equalization control unit are connected in series with the corresponding single battery cell; the second control loop includes a power module and a plurality of active equalization control units, each active equalization control unit is connected to each single battery cell in one-to-one correspondence; the active equalization control unit includes a second switch and a third switch; the power module, the second switch and the third switch of the same active equalization control unit are connected in series with the corresponding single battery cell; the controller is connected to each first switch, each second switch and each third switch. When the voltage of any single battery cell is higher than the first threshold voltage, the corresponding first switch is closed, the corresponding equalization resistor and the single battery cell form a closed loop, so that the single battery cell discharges to release energy, thereby realizing voltage reduction of the single battery cell; when the voltage of the single battery cell is lower than the second threshold voltage, the corresponding second switch and third switch are closed, the power module and the single battery cell form a closed loop, the single battery cell is charged through the power module, so that the single battery cell is boosted, and the voltages of each single battery cell of the entire battery pack are kept consistent, thereby avoiding overcharging of the single battery cell with the smallest capacity during charging and overdischarging of the single battery cell with the smallest capacity during discharging, and improving the cycle life of the battery pack. The application simplifies the switch control structure and control process of active and passive equalization of the system, and can simultaneously control active and passive equalization, adjust the voltage of the battery cell, keep the battery cell in a consistent state, and improve the cycle life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a first structural schematic diagram of the battery management circuit integrated with active and passive equalization in one embodiment;

[0026] Figure 2 FIG. 2 is a second structural schematic diagram of the battery management circuit integrated with active and passive equalization in one embodiment;

[0027] Figure 3 Figure 3 is a third schematic diagram of a battery management circuit integrating active and passive equalization in one embodiment.

[0028] Figure 4 Figure 4 is a fourth schematic diagram of a battery management circuit integrating active and passive equalization in one embodiment.

[0029] Reference Signs:

[0030] 10, battery pack; 110, single cell; 20, first control loop; 200, passive equalization control unit; 210, first switch; 220, equalization resistor; 30, second control loop; 310, power module; 312, constant current and constant voltage regulating circuit; 314, power isolation circuit; 316, power interface module; 320, active equalization control unit; 322, second switch; 324, third switch; 40, controller; 50, prompting module; 510, light emitting element; 60, wireless communication module; 70, display. DETAILED DESCRIPTION

[0031] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts should belong to the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0033] In addition, the term "a plurality of" should mean two and more than two.

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] In one embodiment, asFigure 1 As shown, a battery management circuit integrated with active and passive equalization is provided, comprising a battery pack 10, a first control loop 20, a second control loop 30 and a controller 40; the battery pack 10 comprises a plurality of single cells 110 connected in series; the first control loop 20 comprises a plurality of passive equalization control units 200, each passive equalization control unit 200 is connected to a corresponding single cell 110; the passive equalization control unit 200 comprises a first switch 210 and an equalization resistor 220; the first switch 210 and the equalization resistor 220 of the same passive equalization control unit 200 are connected in series with the corresponding single cell 110; the second control loop 30 comprises a power module 310 and a plurality of active equalization control units 320, each active equalization control unit 320 is connected to a corresponding single cell 110; the active equalization control unit 320 comprises a second switch 322 and a third switch 324; the power module 310, the second switch 322 and the third switch 324 of the same active equalization control unit 320 are connected in series with the corresponding single cell 110; the controller 40 is connected to each first switch 210, each second switch 322 and each third switch 324.

[0036] The battery pack 10 can be a lithium ion battery pack 10, and the corresponding single cell 110 is a lithium ion cell. The battery pack 10 can comprise a plurality of single cells 110, and each single cell 110 is connected in series.

[0037] The first control loop 20 refers to a circuit for passive equalization control, and the number of passive equalization control units 200 is consistent with the number of single cells 110. For example, the battery pack 10 comprises 5 single cells 110, and the first control loop 20 comprises 5 passive equalization control units 200. Based on the connection of the passive equalization control unit 200 to the corresponding single cell 110, when the voltage of the single cell 110 is too high, the corresponding single cell 110 is controlled by the passive equalization control unit 200 to release energy, so that the voltage of the corresponding single cell 110 drops to the preset voltage of the battery pack 10, and the consistency of the voltage of the battery pack 10 is maintained.

[0038] The passive equalization control unit 200 comprises a first switch 210 and an equalization resistor 220, that is, only one single cell 110 needs to be connected in series with the first switch 210 and the equalization resistor 220 of the same passive equalization control unit 200. When the voltage of the single cell 110 is too high, the corresponding first switch 210 is closed to make the single cell 110 release energy to the equalization resistor 220 until the voltage of the single cell 110 drops to the preset voltage of the battery pack 10, and the consistency of the voltage of the battery pack 10 is maintained. Without using too many switches, the switch control structure and control process of the system passive equalization are simplified.

[0039] The second control circuit 30 refers to a circuit for active balancing control, and the number of the active balancing control units 320 is consistent with the number of the single battery cells 110. For example, the battery pack 10 includes 5 single battery cells 110, and the second control circuit 30 includes 5 active balancing control units 320. The active balancing control units 320 are connected to the corresponding single battery cells 110, and when the voltage of the single battery cell 110 is too low, the power module 310 is controlled by the active balancing control unit to charge the corresponding single battery cell 110, so that the voltage of the corresponding single battery cell 110 rises to the preset voltage of the battery pack 10, and the consistency of the voltage of the battery pack 10 is maintained.

[0040] The active balancing control unit 320 includes a second switch 322 and a third switch 324; that is, one single battery cell 110 only needs to be connected in series with the second switch 322 and the third switch 324 of the same active balancing control unit 320,

[0041] When the voltage of the single battery cell 110 is too low, the corresponding second switch 322 and the third switch 324 are closed, so that the control circuit of the single battery cell 110 is closed, and then the single battery cell 110 is charged by the power module 310 until the voltage of the single battery cell 110 rises to the preset voltage of the battery pack 10, and the consistency of the voltage of the battery pack 10 is maintained. Without using too many switches, the switch control structure and control process of the system active balancing are simplified.

[0042] The controller 40 can be but is not limited to a single-chip microcomputer (MCU). The controller 40 is connected to each first switch 210, and when the voltage of any single battery cell 110 is too high, the corresponding first switch 210 can be closed to form a closed loop with the single battery cell 110 and the corresponding first switch 210 and the balancing resistor 220, thereby achieving passive balancing control. The controller 40 is connected to each second switch 322 and each third switch 324, and when the voltage of any single battery cell 110 is too low, the corresponding second switch 322 and the third switch 324 can be closed to form a closed loop with the single battery cell 110 and the corresponding second switch 322 and the third switch 324, thereby achieving active balancing control.

[0043] In the above embodiments, each passive equalization control unit 200 is connected to each individual battery cell 110 in a one-to-one correspondence; the first switch 210 and equalization resistor 220 of the same passive equalization control unit 200 are connected in series with the corresponding individual battery cell 110; each active equalization control unit 320 is connected to each individual battery cell 110 in a one-to-one correspondence; the power module 310, the second switch 322 and the third switch 324 of the same active equalization control unit 320 are connected in series with the corresponding individual battery cell 110; the controller 40 is connected to each first switch 210, each second switch 322 and each third switch 324 respectively, so that when the voltage of any individual battery cell 110 is higher than the first threshold voltage, the corresponding first switch 210 is closed, and the corresponding equalization resistor 220 forms a closed loop with the individual battery cell 110, so that the individual battery cell 110 discharges and releases energy, thereby realizing the voltage reduction of the individual battery cell 110; When the voltage of a single cell 110 is lower than the second threshold voltage, the corresponding second switch 322 and third switch 324 close, and the power module 310 forms a closed loop with the single cell 110. The power module 310 charges the single cell 110, increasing its voltage and thus keeping the voltage of all single cells 110 in the entire battery pack 10 consistent. This prevents the smallest single cell 110 from being overcharged during charging and over-discharged during discharging, thereby improving the cycle life of the battery pack 10. By adjusting the rise and fall of the cell voltage, the consistency of the voltage of each single cell 110 is maintained. This application simplifies the switching control structure and control process of the active and passive balancing of the system, and can simultaneously control active and passive balancing. It can adjust the rise and fall of the cell voltage to keep the cells of the battery pack 10 in a consistent state, thereby improving the cycle life of the battery pack 10.

[0044] In one embodiment, such as Figure 1 As shown, the first signal terminal of the first switch 210 is connected to the first terminal of the equalization resistor 220 of the same passive equalization control unit 200, the second signal terminal of the first switch 210 is connected to the negative terminal of the corresponding individual cell 110, the control terminal of the first switch 210 is connected to the controller 40, and the second terminal of the equalization resistor 220 is connected to the positive terminal of the corresponding individual cell 110; the first signal terminal of the second switch 322 is connected to the positive terminal of the corresponding individual cell 110, the second signal terminal of the second switch 322 is connected to the first terminal of the power module 310, and the control terminal of the second switch 322 is connected to the controller 40; the first signal terminal of the third switch 324 is connected to the negative terminal of the corresponding individual cell 110, the second signal terminal of the third switch 324 is connected to the second terminal of the power module 310, and the control terminal of the third switch 324 is connected to the controller 40.

[0045] For example, when the voltage of any one single battery cell 110 is higher than the first threshold voltage, the controller 40 controls the corresponding first switch 210 to be closed, so that the corresponding equalization resistor 220 forms a closed loop with the single battery cell 110, and the single battery cell 110 can discharge energy to the corresponding equalization resistor 220 to reduce the voltage of the single battery cell 110; when the voltage of any one single battery cell 110 is lower than the second threshold voltage, the controller 40 controls the corresponding second switch 322 and third switch 324 to be closed, so that the power module 310 forms a closed loop with the single battery cell 110, and the single battery cell 110 is charged by the power module 310 to increase the voltage of the single battery cell 110, so that the voltages of all single battery cells 110 in the battery pack 10 are consistent, which simplifies the switch control structure and control process of active balancing and passive balancing of the system, and synchronously controls active balancing and passive balancing; during charging, the single battery cell 110 with the smallest capacity is prevented from overcharging, and during discharging, the single battery cell 110 with the smallest capacity is prevented from overdischarging, which improves the cycle life of the battery pack 10.

[0046] In one embodiment, as shown in FIG. 3, the power module 310 includes a constant current and constant voltage regulating circuit 312 and a power isolation circuit 314; the first output end of the constant current and constant voltage regulating circuit 312 is connected to the second signal end of each second switch 322, the second output end of the constant current and constant voltage regulating circuit 312 is connected to the second signal end of each third switch 324, the input end of the constant current and constant voltage regulating circuit 312 is connected to the output end of the power isolation circuit 314, and the input end of the power isolation circuit 314 is used to connect an input power source. Figure 2

[0047] The input power source can be a built-in power source or an external power source of the battery system, for example, the input power source can be 220V AC mains. The power isolation circuit 314 can be used to isolate the electrical signal transmitted by the input power source to improve the safety of the power module 310. The constant current and constant voltage regulating circuit 312 can be used to perform constant current and constant voltage processing on the electrical signal transmitted by the power isolation circuit 314 to obtain a constant current and constant voltage electrical signal.

[0048] When the voltage of any one single battery cell 110 is lower than the second threshold voltage, the controller 40 controls the corresponding second switch 322 and third switch 324 to be closed, so that the constant current and constant voltage regulating circuit 312 forms a closed loop with the single battery cell 110, and the constant current and constant voltage regulating circuit 312 transmits a constant current and constant voltage electrical signal to the single battery cell 110 to charge the single battery cell 110 and increase the voltage of the single battery cell 110, so that the voltages of all single battery cells 110 in the battery pack 10 are consistent, which simplifies the switch control structure and control process of active balancing of the system; during charging, the single battery cell 110 with the smallest capacity is prevented from overcharging, which improves the cycle life of the battery pack 10. ​

[0049] In one embodiment, as shown in Figure 2 The power module 310 further comprises a power interface module 316; the power interface module 316 is connected to the input end of the power isolation circuit 314, and the power interface module 316 is connected to the input power supply.

[0050] The power interface module 316 can be used to plug in the input power supply.

[0051] Based on the input power supply connected to the power interface module 316, when the voltage of any single battery cell 110 is lower than the second threshold voltage, the controller 40 controls the corresponding second switch 322 and the third switch 324 to be closed, so that the constant current and constant voltage regulation circuit 312 forms a closed loop with the single battery cell 110, and then the input power supply transmits the electrical signal to the power isolation circuit 314 through the power interface module 316, transmits the electrical signal to the constant current and constant voltage regulation circuit 312 after the power isolation circuit 314 processes the electrical signal, the constant current and constant voltage regulation circuit 312 processes the received electrical signal, and then transmits the constant current and constant voltage electrical signal to the single battery cell 110 through the constant current and constant voltage regulation circuit 312, realizes charging the single battery cell 110, makes the single battery cell 110 voltage rise, and then makes the voltage of each single battery cell 110 of the whole battery pack 10 consistent, improves the operation convenience of the active balancing control process.

[0052] In one embodiment, as shown in Figure 3 The battery management circuit integrated with active and passive balancing further comprises a prompt module 50, and the prompt module 50 is connected to the controller 40.

[0053] The prompt module 50 can be a light prompt module 50, and the prompt module 50 can be used to issue a light warning reminder when any single battery cell 110 occurs an abnormality, so that the user can check the fault condition. In one example, the prompt module 50 comprises a plurality of light emitting elements 510, each light emitting element 510 is arranged one-to-one corresponding to each single battery cell 110, and each light emitting element 510 is connected to the controller 40.

[0054] The light emitting element 510 can be an LED element, based on the one-to-one correspondence between each light emitting element 510 and each single battery cell 110, the controller 40 is connected to each light emitting element 510, and then when any single battery cell 110 occurs a fault, the controller 40 controls the light emitting element 510 corresponding to the single battery cell 110 to light, thereby realizing real-time fault reminding of the single battery cell 110.

[0055] In one embodiment, as shown in Figure 4 The battery management circuit integrated with active and passive balancing further comprises a wireless communication module 60, and the wireless communication module 60 is connected to the controller 40.

[0056] The wireless communication module 60 can be, but is not limited to, a WIFI communication module, a 4G communication module, a 5G communication module, or a Bluetooth communication module.

[0057] The wireless communication module 60 can be used for communication connection of the terminal device. The controller 40 is connected to the wireless communication module 60, and the controller 40 can also be connected to the battery pack 10. The controller 40 can obtain the voltage information of each single battery cell 110 of the battery pack 10, and transmit the voltage information to the terminal device through the wireless communication module 60, so that the user can view the voltage information of each single battery cell 110 in real time through the terminal device.

[0058] In one embodiment, as shown in FIG. 7, the battery management circuit integrated with active and passive equalization further comprises a display 70, and the display 70 is connected to the controller 40. Figure 4

[0059] The display 70 can be an LED display 70 or an LCD display 70.

[0060] The controller 40 is connected to the display 70, and the controller 40 can obtain the voltage information of each single battery cell 110 of the battery pack 10, and display the voltage information in real time through the display 70, so that the user can view the voltage information of each single battery cell 110.

[0061] In one embodiment, a battery management system integrated with active and passive equalization is also provided, which comprises the battery management circuit integrated with active and passive equalization of any one of the above.

[0062] The specific description of the battery management circuit integrated with active and passive equalization can refer to the specific description of the battery management circuit integrated with active and passive equalization in the above embodiments, which will not be repeated here.

[0063] ​The battery pack comprises a plurality of single cells connected in series; the first control loop comprises a plurality of passive equalization control units, each passive equalization control unit being connected to each single cell in one-to-one correspondence; the passive equalization control unit comprises a first switch and an equalization resistor; the first switch and the equalization resistor of the same passive equalization control unit are connected in series with the corresponding single cell; the second control loop comprises a power module and a plurality of active equalization control units, each active equalization control unit being connected to each single cell in one-to-one correspondence; the active equalization control unit comprises a second switch and a third switch; the power module, the second switch and the third switch of the same active equalization control unit are connected in series with the corresponding single cell; the controller is connected to each first switch, each second switch and each third switch. When the voltage of any single cell is higher than the first threshold voltage, the corresponding first switch is closed, and the corresponding equalization resistor and the single cell form a closed loop, so that the single cell discharges to release energy, thereby realizing voltage reduction of the single cell; when the voltage of the single cell is lower than the second threshold voltage, the corresponding second switch and third switch are closed, and the power module and the single cell form a closed loop, so that the single cell is charged by the power module to increase the voltage, thereby keeping the voltages of all single cells of the battery pack consistent, avoiding overcharging of the single cell with the smallest capacity during charging, avoiding overdischarging of the single cell with the smallest capacity during discharging, and improving the cycle life of the battery pack. The application simplifies the switch control structure and control process of active equalization and passive equalization of the system, can simultaneously control active equalization and passive equalization, can adjust the voltage of the single cell, keeps the single cells of the battery pack in a consistent state, and improves the cycle life of the battery pack.

[0064] It should be noted that the battery management system integrated with active and passive equalization can further comprise a housing and the like, and the specific battery management circuit integrated with active and passive equalization can comprise more components than those described in the above embodiments, or some components can be combined, or have different component arrangements.

[0065] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0066] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery management circuit integrating active-passive equalization, characterized in that, The battery pack comprises a plurality of single cells connected in series. A first control loop comprises a plurality of passive equalization control units, each of which is connected to a corresponding single cell; the passive equalization control unit comprises a first switch and an equalization resistor; the first switch and the equalization resistor of the same passive equalization control unit are connected in series with the corresponding single cell. A second control loop comprises a power module and a plurality of active equalization control units, each of which is connected to a corresponding single cell; the active equalization control unit comprises a second switch and a third switch; the power module, the second switch and the third switch of the same active equalization control unit are connected in series with the corresponding single cell. A controller is connected to each first switch, each second switch and each third switch. The first signal end of the first switch is connected to the first end of the equalization resistor of the same passive equalization control unit, the second signal end of the first switch is connected to the negative electrode of the corresponding single cell, and the control end of the first switch is connected to the controller; the second end of the equalization resistor is connected to the positive electrode of the corresponding single cell. The prompt module is connected to the controller. The prompt module comprises a plurality of light emitting elements, each of which is arranged in one-to-one correspondence with each single cell, and each light emitting element is connected to the controller. When the voltage of the single cell is too low, the controller controls the corresponding second switch and third switch to be closed, so that the control loop of the single cell is closed, and then the single cell is charged by the power module until the voltage of the single cell rises to the preset voltage of the battery pack. The display is connected to the controller. The first signal end of the second switch is connected to the positive electrode of the corresponding single cell, the second signal end of the second switch is connected to the first end of the power module, and the control end of the second switch is connected to the controller.

2. The integrated active-passive equalized battery management circuit of claim 1, wherein, The first signal end of the third switch is connected to the negative electrode of the corresponding single cell, the second signal end of the third switch is connected to the second end of the power module, and the control end of the third switch is connected to the controller. The power module comprises a constant current and constant voltage regulation circuit and a power isolation circuit.

3. The integrated active-passive equalization battery management circuit of claim 2, wherein, The first output end of the constant current and constant voltage regulation circuit is connected to the second signal end of each second switch, the second output end of the constant current and constant voltage regulation circuit is connected to the second signal end of each third switch, the input end of the constant current and constant voltage regulation circuit is connected to the output end of the power isolation circuit, and the input end of the power isolation circuit is used to connect the input power supply. The power module further comprises a power interface module.

4. The integrated active-passive equalization battery management circuit of claim 3, wherein, The power interface module is connected to the input end of the power isolation circuit, and the power interface module is connected to the input power supply. The wireless communication module is connected to the controller.

5. The integrated active-passive equalized battery management circuit of claim 1, wherein, The single cell is a lithium ion cell.

6. The integrated active-passive equalization battery management circuit of any one of claims 1 to 5, wherein, ​ 7. A battery management system integrating active and passive equalization, characterized in that, A battery management circuit including the integrated active-passive equalization of any one of claims 1 to 6.

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