Battery equalization management circuit

Abstract

The utility model provides a battery equalization management circuit, and belongs to the technical field of battery management. The battery equalization management circuit comprises a bidirectional flyback DC-DC module, a main control module and a voltage detection module, the first end of the bidirectional flyback DC-DC module is used for being connected with a DC bus, the second end of the bidirectional flyback DC-DC module is used for being connected with a storage battery, and the control end of the bidirectional flyback DC-DC module is connected with the main control module; the first end of the voltage detection module is connected with the storage battery, the second end of the voltage detection module is connected with the main control module, and the voltage detection module is used for detecting the voltage of each single battery. The problems of low efficiency and energy waste of a passive equalization mode can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery management, and particularly to a battery equalization management circuit. Background Art

[0002] When the storage battery leaves the factory, there are slight performance differences between each single battery. These differences may lead to uneven power distribution. As the number of charge and discharge cycles increases, this imbalance will gradually amplify, accelerating the attenuation of the battery capacity, thereby affecting the performance and life of the entire battery pack. In order to keep the voltage deviation of the single battery within the expected range during normal use, the capacity equalization of the single battery is required.

[0003] Currently, the battery equalization management is usually in the form of passive equalization management. By discharging the single battery with a higher voltage through resistance energy consumption, the purpose of equalization is achieved. The circuit is simple and reliable, and the cost is low, but the battery efficiency is also low. Summary of the Utility Model

[0004] The embodiments of the present disclosure provide a battery equalization management circuit to solve the problems of low efficiency and energy waste in the passive equalization method.

[0005] The embodiments of the present disclosure provide a battery equalization management circuit, including a bidirectional flyback DC-DC module, a main control module, and a voltage detection module;

[0006] The first end of the bidirectional flyback DC-DC module is used to connect to the DC bus, the second end of the bidirectional flyback DC-DC module is used to connect to the storage battery, and the control end of the bidirectional flyback DC-DC module is connected to the main control module;

[0007] The first end of the voltage detection module is used to connect to the storage battery, the second end of the voltage detection module is connected to the main control module, and the voltage detection module is used to detect the voltage of each single battery.

[0008] In an exemplary embodiment of the present disclosure, a drive module is further included;

[0009] The first end of the drive module is connected to the main control module, and the second end of the drive module is connected to the control end of the bidirectional flyback DC-DC module.

[0010] In an exemplary embodiment of the present disclosure, the bidirectional flyback DC-DC module includes a transformer T1, a switching tube Q2, a switching tube Q1, a diode D2, a diode D3, and a diode D4;

[0011] The first input terminal of the transformer T1 serves as the first terminal of the bidirectional flyback DC-DC module. The first input terminal of the transformer T1 is used to connect to the DC bus. The second input terminal of the transformer T1 is connected to the first terminal of the switching transistor Q2. The second terminal of the switching transistor Q2 is grounded. The control terminal of the switching transistor Q2 serves as the first control terminal of the bidirectional flyback DC-DC module, and the control terminal of the switching transistor Q2 is connected to the main control module;

[0012] The first output terminal of the transformer T1 serves as the second terminal of the bidirectional flyback DC-DC module. The second output terminal of the transformer T1 is connected to the first terminal of the switching transistor Q1. The second terminal of the switching transistor Q1 is grounded. The control terminal of the switching transistor Q1 serves as the second control terminal of the bidirectional flyback DC-DC module, and the control terminal of the switching transistor Q1 is connected to the main control module;

[0013] The cathode of the diode D4 is connected to the first terminal of the switching transistor Q2, and the anode of the diode D4 is grounded;

[0014] The cathode of the diode D2 is connected to the first terminal of the switching transistor Q1, the anode of the diode D2 is grounded, and the diode D3 is connected in parallel with the diode D2 in the same phase across both ends;

[0015] In an exemplary embodiment of the present disclosure, the bidirectional flyback DC-DC module further includes a transient voltage suppression diode TVS1, a diode D1, a capacitor C6, and a resistor R1;

[0016] The anode of the transient voltage suppression diode TVS1 is connected to the first input terminal of the transformer T1, the cathode of the transient voltage suppression diode TVS1 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the second input terminal of the transformer T1;

[0017] The capacitor C6 and the resistor R1 are respectively connected in parallel with the transient voltage suppression diode TVS1.

[0018] In an exemplary embodiment of the present disclosure, the bidirectional flyback DC-DC module further includes a first filtering module and a second filtering module;

[0019] The first terminal of the first filtering module is connected to the first input terminal of the transformer T1, and the second terminal of the first filtering module is grounded;

[0020] The first terminal of the second filtering module is connected to the first output terminal of the transformer T1, and the second terminal of the second filtering module is grounded.

[0021] In an exemplary embodiment of the present disclosure, the driving module includes a first driving module and a second driving module;

[0022] The first end of the first driving module is connected to the main control module, and the second end of the first driving module is connected to the first control end of the bidirectional flyback DC-DC module;

[0023] The first end of the second driving module is connected to the main control module, and the second end of the second driving module is connected to the second control end of the bidirectional flyback DC-DC module;

[0024] The first driving module and the second driving module have the same circuit structure.

[0025] In an exemplary embodiment of the present disclosure, the first driving module includes a triode Q4, a resistor R17, a resistor R18, a resistor R11, and a resistor R16;

[0026] The first end of the resistor R11 is connected to the VCC power supply, the second end of the resistor R11 is connected to the collector of the triode Q4 through the resistor R16, the second end of the resistor R11 serves as the second end of the first driving module, and the emitter of the triode Q4 is grounded;

[0027] The first end of the resistor R17 is connected to the main control module, the first end of the resistor R17 serves as the first end of the first driving module, the second end of the resistor R17 is connected to the base of the triode Q4, and the base of the triode Q4 is grounded through the resistor R18.

[0028] In an exemplary embodiment of the present disclosure, the first driving module further includes an optocoupler OP2;

[0029] The first input terminal of the optocoupler OP2 is connected to the second end of the resistor R11, the second input terminal of the optocoupler OP2 is connected to the collector of the triode Q4, the first output terminal of the optocoupler OP2 is connected to the VDD power supply, the second output terminal of the optocoupler OP2 serves as the second end of the first driving module, and the third output terminal of the optocoupler OP2 is grounded.

[0030] The beneficial effects of the battery equalization management circuit provided by the embodiments of the present disclosure are as follows:

[0031] It can be concluded from the above that the voltage detection module continuously monitors the voltage status of each battery, ensuring the real-time and accuracy of battery data; the main control module quickly analyzes based on these data, accurately judges the imbalance between batteries, and issues instructions to the bidirectional flyback DC-DC module accordingly to achieve energy transfer or supplementary charging when necessary. This embodiment actively adjusts the electrical energy distribution between individual batteries by real-time monitoring and responding to the voltage changes of individual batteries, preventing battery damage caused by overcharging and over-discharging, optimizing the overall energy utilization rate, and extending the life cycle of the battery pack. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of a battery equalization management circuit provided by an embodiment of the present disclosure;

[0034] Figure 2 is a circuit diagram of a bidirectional flyback DC-DC module provided by an embodiment of the present disclosure;

[0035] Figure 3 is a circuit diagram of a first driving module provided by an embodiment of the present disclosure. Specific embodiments

[0036] To enable those skilled in the art to better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the drawings in the embodiments of this solution. Obviously, the described embodiments are some, but not all, of the embodiments of this solution. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0037] The term "including" in the specification, claims, and the above drawings of this solution, as well as any other variations, means "including but not limited to", and is intended to cover non-exclusive inclusion, not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0038] The following will describe the implementation of the present disclosure in detail in conjunction with specific drawings:

[0039] Figure 1 is a schematic structural diagram of a battery equalization management circuit provided by an embodiment of the present disclosure. Referring to Figure 1 , the battery equalization management circuit includes a bidirectional flyback DC-DC module, a main control module, and a voltage detection module; the first end of the bidirectional flyback DC-DC module is used to connect to the DC bus, the second end of the bidirectional flyback DC-DC module is used to connect to the storage battery, and the control end of the bidirectional flyback DC-DC module is connected to the main control module; the first end of the voltage detection module is used to connect to the storage battery, the second end of the voltage detection module is connected to the main control module, and the voltage detection module is used to detect the voltage of each single battery.

[0040] In this embodiment, the storage battery can be composed of multiple single cells connected in series. During the discharge and charging processes, the single cells will experience different voltage changes. When a certain single cell in the storage battery has a voltage lower than that of other cells due to aging or other reasons, it will not be able to effectively participate in the charging process, which may cause this cell to be over-discharged and eventually fail. Similarly, if a certain single cell has too high a voltage, it may be over-charged, which will also damage the health of the battery. The battery equalization management circuit realizes voltage equalization by transferring electrical energy from the cell with a higher voltage to the cell with a lower voltage when necessary, or providing an additional charging current from the bus to the cell with a lower voltage, thus ensuring the overall performance and safety of the storage battery.

[0041] In this embodiment, voltage imbalance may lead to overcharging or over-discharging of the battery, thus shortening the battery life and reducing the reliability of the system. Therefore, the voltage detection module is used to monitor the voltage of each single cell in real time. It is connected to each single cell of the storage battery and continuously detects and records their voltage values. These data are transmitted to the main control module. The main control module is used to monitor the state of the entire storage battery and issue corresponding control signals. It receives the data from the voltage detection module, analyzes the overall voltage condition of the storage battery, and controls the operation of the bidirectional flyback DC-DC module when there is an imbalance between the single cells to achieve battery equalization. The bidirectional flyback DC-DC module is used to efficiently convert the electrical energy in the battery pack. The first end of the bidirectional flyback DC-DC module is connected to the DC bus, and the second end is connected to the storage battery (i.e., the single cells in the storage battery). When the storage battery is working normally, the bidirectional flyback DC-DC module can transfer electrical energy from the bus to the storage battery as needed, or conversely provide energy from the storage battery to the bus. Its control end is connected to the main control module to receive instructions and adjust the working state.

[0042] It can be concluded from the above that the voltage detection module continuously monitors the voltage state of each battery, ensuring the real-time and accuracy of the battery data; the main control module quickly analyzes based on these data, accurately judges the imbalance between the batteries, and issues instructions to the bidirectional flyback DC-DC module accordingly to achieve energy transfer or supplementary charging when necessary. This embodiment actively adjusts the electrical energy distribution between the single cells by real-time monitoring and responding to the voltage changes of the single cells, not only preventing battery damage caused by overcharging and over-discharging, but also optimizing the overall energy utilization rate and extending the life cycle of the battery pack.

[0043] In an embodiment of the present disclosure, a drive module is further included; the first end of the drive module is connected to the main control module, and the second end of the drive module is connected to the control end of the bidirectional flyback DC-DC module.

[0044] In practical applications, the driving ability of the control instructions output by the main control module is weak, and it cannot ensure that the bidirectional flyback DC-DC module reliably executes the corresponding instructions. Therefore, a driving module is added in this embodiment.

[0045] In this embodiment, the addition of the driving module makes the transmission of the control signal faster and more accurate, reducing the possibility of signal delay and distortion. In addition, the driving module can also provide the necessary current and voltage driving capabilities to ensure that the bidirectional flyback DC-DC module can work stably under various working conditions.

[0046] In an embodiment of the present disclosure, the bidirectional flyback DC-DC module includes a transformer T1, a switching transistor Q2, a switching transistor Q1, a diode D2, a diode D3, and a diode D4; the first input terminal of the transformer T1 serves as the first terminal of the bidirectional flyback DC-DC module, the first input terminal of the transformer T1 is used to connect to the DC bus, the second input terminal of the transformer T1 is connected to the first terminal of the switching transistor Q2, the second terminal of the switching transistor Q2 is grounded, the control terminal of the switching transistor Q2 serves as the first control terminal of the bidirectional flyback DC-DC module, and the control terminal of the switching transistor Q2 is connected to the main control module; the first output terminal of the transformer T1 serves as the second terminal of the bidirectional flyback DC-DC module, the second output terminal of the transformer T1 is connected to the first terminal of the switching transistor Q1, the second terminal of the switching transistor Q1 is grounded, the control terminal of the switching transistor Q1 serves as the second control terminal of the bidirectional flyback DC-DC module, and the control terminal of the switching transistor Q1 is connected to the main control module; the cathode of the diode D4 is connected to the first terminal of the switching transistor Q2, and the anode of the diode D4 is grounded; the cathode of the diode D2 is connected to the first terminal of the switching transistor Q1, the anode of the diode D2 is grounded, and the diode D3 is connected in parallel with the diode D2 in the same phase.

[0047] In this embodiment, the bidirectional flyback DC-DC module is used to efficiently convert the electrical energy in the battery pack.

[0048] Exemplary: When the voltage of a single battery cell is lower than the average voltage by 15 mV, the main control module sends a high-level signal to the control terminal of the switching transistor Q2. The switching transistor Q2 conducts, and the electrical energy on the DC bus flows into the primary winding of the transformer T1 through the switching transistor Q2. At the same time, a corresponding amount of electrical energy is induced in the secondary winding of the transformer T1. Since the switching transistor Q1 is turned off at this time, the electrical energy on the secondary winding of the transformer T1 flows to the storage battery through the diode D2, realizing the forward transfer of energy. At the moment when the switching transistor Q2 is turned off, the remaining energy in the transformer T1 is released through the diode D4 to protect the switching transistor Q2 from being damaged. When the voltage of a single battery cell is higher than the average voltage by 15 mV, the main control module sends a high-level signal to the control terminal of the switching transistor Q1. The switching transistor Q1 conducts, and the electrical energy in the storage battery flows into the secondary winding of the transformer T1 through the switching transistor Q1. At the same time, a corresponding amount of electrical energy is induced in the primary winding. Since the switching transistor Q2 is turned off at this time, the electrical energy on the primary winding flows out through the DC bus, realizing the reverse transfer of energy.

[0049] Among them, the diode D4 and the diode D2 are respectively used to protect the switching transistors from being damaged when the switching transistors Q2 and Q1 are turned off.

[0050] In this embodiment, the bidirectional flyback DC-DC module realizes the bidirectional transfer of electrical energy by controlling the on and off of the switching transistors Q2 and Q1 and using the flyback principle of the transformer. In the forward transfer mode, the energy flows from the DC bus to the storage battery; in the reverse transfer mode, the energy flows from the storage battery to the DC bus. The main control module formulates and executes an equalization strategy according to the data provided by the voltage detection module to achieve the balanced management of the internal voltage of the battery pack. At the same time, through the protection of components such as diodes, the safety and reliability of the circuit are improved.

[0051] In an embodiment of the present disclosure, the bidirectional flyback DC-DC module further includes a transient voltage suppression diode TVS1, a diode D1, a capacitor C6, and a resistor R1; the anode of the transient voltage suppression diode TVS1 is connected to the first input terminal of the transformer T1, the cathode of the transient voltage suppression diode TVS1 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the second input terminal of the transformer T1; the capacitor C6 and the resistor R1 are respectively connected in parallel with the transient voltage suppression diode TVS1.

[0052] In this embodiment, the transient voltage suppression diode TVS1, diode D1, capacitor C6, and resistor R1 constitute a high-voltage side absorption circuit. When a transient overvoltage appears at the first input terminal (i.e., the high-voltage side) of the transformer T1, the transient voltage suppression diode TVS1 will conduct rapidly, guiding the overvoltage to the diode D1, and releasing the overvoltage to the ground through the diode D1, thereby protecting the subsequent circuit from damage and ensuring that the circuit operates within the normal working range. The diode D1 plays a role of unidirectional conduction in the high-voltage side absorption circuit. When the transient voltage suppression diode TVS1 conducts, the diode D1 will also conduct, providing a low-impedance path to the ground for the transient overvoltage. The presence of the diode D1 ensures that the transient overvoltage can only be released along the predetermined path, preventing possible circuit damage. The capacitor C6 is used to absorb and store high-frequency noise and transient interference in the circuit. The capacitor C6 and the resistor R1 together form an RC filter circuit, which helps to smooth the input voltage and reduce the impact of transient voltage.

[0053] In this embodiment, the high-voltage side absorption circuit can effectively protect the bidirectional flyback DC-DC module from high-voltage transients and improve the stability and reliability of the circuit.

[0054] In an embodiment of the present disclosure, the bidirectional flyback DC-DC module further includes a first filter module and a second filter module; the first end of the first filter module is connected to the first input terminal of the transformer T1, and the second end of the first filter module is grounded; the first end of the second filter module is connected to the first output terminal of the transformer T1, and the second end of the second filter module is grounded.

[0055] In this embodiment, the first end of the first filter module is connected to the first input terminal of the transformer T1 (which can also be referred to as: the high-voltage side, the input side, or the primary coil). The first filter module can be composed of multiple capacitors connected in parallel. The first filter module can effectively suppress high-frequency noise and electromagnetic interference entering from the power input terminal, reducing the impact of these noises on the subsequent circuit.

[0056] The first end of the second filter module is connected to the first output terminal of the transformer T1 (which can also be referred to as: the low-voltage side, the output side, or the secondary coil). The second filter module can also be composed of multiple capacitors connected in parallel. The second filter module can smooth the ripple and noise in the output voltage, making the output voltage more stable and meeting the requirements of the load for power quality.

[0057] In an embodiment of the present disclosure, the drive module includes a first drive module and a second drive module; the first end of the first drive module is connected to the main control module, and the second end of the first drive module is connected to the first control terminal of the bidirectional flyback DC-DC module; the first end of the second drive module is connected to the main control module, and the second end of the second drive module is connected to the second control terminal of the bidirectional flyback DC-DC module; the circuit structures of the first drive module and the second drive module are the same.

[0058] In this embodiment, the driving ability of the control instruction output by the main control module is weak. To ensure the reliable operation of the bidirectional flyback DC-DC module, a first driving module and a second driving module are added in this embodiment. These two driving modules are respectively used to control the two control ends of the bidirectional flyback DC-DC module to ensure that the bidirectional flyback DC-DC module can work efficiently and stably according to the requirements of the main control module.

[0059] In an embodiment of the present disclosure, the first driving module includes a triode Q4, a resistor R17, a resistor R18, a resistor R11, and a resistor R16; the first end of the resistor R11 is connected to the VCC power supply, the second end of the resistor R11 is connected to the collector of the triode Q4 through the resistor R16, the second end of the resistor R11 serves as the second end of the first driving module, and the emitter of the triode Q4 is grounded; the first end of the resistor R17 is connected to the main control module, the first end of the resistor R17 serves as the first end of the first driving module, the second end of the resistor R17 is connected to the base of the triode Q4, and the base of the triode Q4 is grounded through the resistor R18.

[0060] In this embodiment, the triode Q4, the resistor R17, the resistor R18, the resistor R11, and the resistor R16 constitute the first driving module. When the voltage of a certain single cell is lower than the average voltage, the main control module sends a low-level signal to the base of the triode Q4, and the triode Q4 is cut off. At this time, the voltage at the second end of the resistor R11 is approximately the VCC power supply voltage, and this voltage is sufficient to make the switching tube Q2 conduct reliably. If the storage battery does not need to perform energy conversion, the main control module outputs a high-level signal, the triode Q4 conducts, and the voltage division on the resistor R16 cannot make the switching tube Q2 conduct normally. At this time, the switching tube Q2 is cut off.

[0061] In an embodiment of the present disclosure, the first driving module further includes an optocoupler OP2; the first input terminal of the optocoupler OP2 is connected to the second end of the resistor R11, the second input terminal of the optocoupler OP2 is connected to the collector of the triode Q4, the first output terminal of the optocoupler OP2 is connected to the VDD power supply, the second output terminal of the optocoupler OP2 serves as the second end of the first driving module, and the third output terminal of the optocoupler OP2 is grounded.

[0062] In this embodiment, an optocoupler OP2 is added between the second end of the resistor R11 and the control end of the switching tube Q2. The optocoupler OP2 serves as an isolation element and is used to electrically isolate the input signal and the output signal to improve the anti-interference ability and safety of the circuit.

[0063] When the voltage of a certain single battery is lower than the average voltage, the main control module sends a high-level signal to the base of the triode Q4. The triode Q4 conducts, and the resistor R16 can provide a voltage difference for the light-emitting diode inside the optocoupler OP2. This voltage difference can turn on the optocoupler OP2, and the second output terminal of the optocoupler OP2 outputs a high-level signal, and the high level can reliably turn on the switching tube Q2. If the energy conversion of the storage battery is not required, the main control module outputs a low-level signal, the triode Q4 is cut off, the optocoupler OP2 is cut off, the second output terminal of the optocoupler OP2 outputs a low-level signal, and the switching tube Q2 is cut off.

[0064] In this embodiment, by adding the optocoupler OP2, the first driving module realizes electrical isolation between the input and the output, effectively improving the anti-interference ability and safety of the circuit. At the same time, this design also increases the reliability of the circuit, enabling the first driving module to better adapt to complex and changeable working environments.

[0065] The circuit structures of the first driving module and the second driving module are the same, and the working principles are also the same. Here, the circuit structure of the second driving module will not be specifically described in detail.

[0066] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A battery balancing management circuit, characterized in that: It includes a bidirectional flyback DC-DC module, a main control module and a voltage detection module; The first end of the bidirectional flyback DC-DC module is used to connect to the DC bus, the second end of the bidirectional flyback DC-DC module is used to connect to the battery, and the control end of the bidirectional flyback DC-DC module is connected to the main control module; The first end of the voltage detection module is used to connect to the storage battery, the second end of the voltage detection module is connected to the main control module, and the voltage detection module is used to detect the voltage of each single battery.

2. The battery balancing management circuit according to claim 1, wherein: Also includes a driver module; The first end of the driving module is connected to the main control module, and the second end of the driving module is connected to the control end of the bidirectional flyback DC-DC module.

3. The battery balancing management circuit according to claim 1, wherein: The bidirectional flyback DC-DC module includes a transformer T1, a switch tube Q2, a switch tube Q1, a diode D2, a diode D3 and a diode D4; The first input end of the transformer T1 serves as the first end of the bidirectional flyback DC-DC module, and the first input end of the transformer T1 is used to connect to the DC bus. The second input end of the transformer T1 is connected to the first end of the switch tube Q2, and the second end of the switch tube Q2 is grounded. The control end of the switch tube Q2 serves as the first control end of the bidirectional flyback DC-DC module, and the control end of the switch tube Q2 is connected to the main control module. The first output end of the transformer T1 serves as the second end of the bidirectional flyback DC-DC module, the second output end of the transformer T1 is connected to the first end of the switch tube Q1, the second end of the switch tube Q1 is grounded, the control end of the switch tube Q1 serves as the second control end of the bidirectional flyback DC-DC module, and the control end of the switch tube Q1 is connected to the main control module; The cathode of the diode D4 is connected to the first end of the switch tube Q2, and the anode of the diode D4 is grounded; The cathode of the diode D2 is connected to the first end of the switch tube Q1 , the anode of the diode D2 is grounded, and the diode D3 is connected in parallel at both ends of the diode D2 in phase.

4. The battery balancing management circuit according to claim 3, characterized in that: The bidirectional flyback DC-DC module also includes a transient suppression diode TVS1, a diode D1, a capacitor C6 and a resistor R1; The anode of the transient suppression diode TVS1 is connected to the first input terminal of the transformer T1, the cathode of the transient suppression diode TVS1 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the second input terminal of the transformer T1; The capacitor C6 and the resistor R1 are respectively connected in parallel with the transient voltage suppressor diode TVS1.

5. The battery balancing management circuit according to claim 3, wherein: The bidirectional flyback DC-DC module also includes a first filter module and a second filter module; A first end of the first filter module is connected to a first input end of the transformer T1, and a second end of the first filter module is grounded; A first end of the second filtering module is connected to the first output end of the transformer T1 , and a second end of the second filtering module is grounded.

6. The battery balancing management circuit according to claim 2, wherein: The driving module includes a first driving module and a second driving module; The first end of the first driving module is connected to the main control module, and the second end of the first driving module is connected to the first control end of the bidirectional flyback DC-DC module; A first end of the second driving module is connected to the main control module, and a second end of the second driving module is connected to a second control end of the bidirectional flyback DC-DC module; The circuit structures of the first driving module and the second driving module are the same.

7. The battery balancing management circuit according to claim 6, wherein: The first driving module includes a transistor Q4, a resistor R17, a resistor R18, a resistor R11 and a resistor R16; The first end of the resistor R11 is connected to the VCC power supply, the second end of the resistor R11 is connected to the collector of the transistor Q4 through the resistor R16, the second end of the resistor R11 serves as the second end of the first driving module, and the emitter of the transistor Q4 is grounded; The first end of the resistor R17 is connected to the main control module, the first end of the resistor R17 serves as the first end of the first driving module, the second end of the resistor R17 is connected to the base of the transistor Q4, and the base of the transistor Q4 is grounded through the resistor R18.

8. The battery balancing management circuit according to claim 7, wherein: The first driving module also includes an optical coupler OP2; The first input end of the optocoupler OP2 is connected to the second end of the resistor R11, the second input end of the optocoupler OP2 is connected to the collector of the transistor Q4, the first output end of the optocoupler OP2 is connected to the VDD power supply, the second output end of the optocoupler OP2 serves as the second end of the first driving module, and the third output end of the optocoupler OP2 is grounded.

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