BMS protection system with active equalization circuit

Abstract

The utility model discloses a BMS protection system with an active equalization circuit, which comprises the active equalization circuit, the active equalization circuit comprises a battery voltage circuit, a control switch driving circuit and a charging and discharging circuit, the battery voltage circuit detects the battery voltage state, the control circuit is switched on when the equalization starting state is reached, and the charging and discharging circuit is switched off when the equalization starting state is reached. The control switch driving circuit serves as an intermediate control link to ensure accurate control of the equalization process and avoid damage of sudden change of current or voltage to the batteries, the charging and discharging circuit intelligently controls charging and discharging of the solid-state capacitor to achieve voltage balance between the single batteries in the battery pack, the overall performance and safety of the battery pack are improved, and the service life of the battery pack is prolonged. Through cooperative work of the battery voltage circuit, the control switch driving circuit and the charging and discharging circuit, accurate control and balanced adjustment of the voltage of the single batteries in the battery pack are achieved, the use efficiency of the battery pack can be improved, the service life of the batteries can be effectively prolonged, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to BMS protection technical field, concretely relates to a BMS protection system with active equalization circuit. BACKGROUND

[0002] BMS plays a crucial role in electric vehicles, energy storage systems and other fields. It is responsible for monitoring the voltage, current, temperature, capacity, SOC (state of charge) and other key parameters of the battery pack, and interacts with the vehicle control computer in real time through CAN communication and other means to ensure the safe and efficient operation of the battery. BMS not only improves the energy utilization efficiency of the battery, but also timely detects and handles abnormal conditions of the battery pack, such as overcharging, overdischarging, overheating, etc., thereby ensuring the stability and safety of the battery system.

[0003] During the use of the battery pack, due to the differences between the battery monomers (such as manufacturing process, material performance, etc.), the voltage, capacity and other parameters of each monomer battery will gradually appear inconsistency. This inconsistency will seriously affect the overall performance and life of the battery pack. In order to eliminate or reduce this inconsistency, the equalization technology is introduced in the BMS.

[0004] The traditional equalization technology is mainly passive equalization, that is, through the discharge of resistance, the energy of high-voltage battery is dissipated to achieve the purpose of balancing the electric quantity with low-voltage battery. However, passive equalization has the disadvantages of large energy waste, slow equalization speed and low equalization efficiency. CONTENT OF THE UTILITY MODEL

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a BMS protection system with active equalization circuit, which can realize active equalization for charging and discharging.

[0006] The purpose of the utility model is realized by the following technical scheme:

[0007] The utility model provides a kind of BMS protection system with active equalization circuit, including active equalization circuit, the active equalization circuit includes battery voltage circuit, control switch drive circuit and charge-discharge circuit, the battery voltage circuit connects the control switch drive circuit, the charge-discharge circuit is connected with battery voltage circuit and control switch drive circuit respectively, the battery voltage circuit is used when detecting equalization start voltage, battery voltage circuit conduction and timely control switch drive circuit conduction;The control switch drive circuit is used when conduction, output stable voltage;The charge-discharge circuit includes MOS pipe drive chip and solid-state capacitor, and when the MOS pipe drive chip receives high level power supply, the high end output pin and low end output pin of MOS pipe drive chip are changed from low level to high level, and when external input positive signal or reverse signal, automatically adjust the level state of high end output pin and low end output pin to charge solid-state capacitor.

[0008] In the utility model, as an alternative embodiment, the number of battery voltage circuits is 4 groups, the number of charge-discharge circuits is consistent with the number of battery voltage circuits, and the 4 groups of battery voltage circuits are connected with control switch drive circuits.

[0009] In the utility model, as an alternative embodiment, the battery voltage circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, an equalization chip, a first diode, a triode and a first MOS tube, one end of the first resistor is connected with external power supply, one end of the first capacitor and the other end of the first resistor are connected with the VDD pin of the equalization chip, the other end of the first capacitor and the ground pin of the equalization chip are grounded, one end of the second resistor is connected with the output pin of the equalization chip, the other end of the second resistor and one end of the third resistor are connected with the base of the triode, the emitter of the triode and the other end of the third resistor are respectively connected with the external power supply, the collector of the triode is connected with the positive pole of the first diode through the fourth resistor, the negative pole of the first diode, one end of the fifth resistor and one end of the second battery are connected with the gate of the first MOS tube, the source of the first MOS tube, the other end of the fifth resistor and the other end of the second capacitor are grounded, and the drain of the first MOS tube is connected with the control switch drive circuit.

[0010] In the utility model, as an optional embodiment, the control switch drive circuit includes diode D9, MOS tube U18, resistance R32, resistance R34, resistance RL16, resistance R46, resistance R47, resistance R48, voltage stabilizing chip U21, drive chip U22, capacitor C17 and capacitor C18, one end of resistance R32 and the drain electrode of MOS tube U18 are all connected with external power supply, the other end of resistance R32 and one end of resistance R34 are all connected with the grid electrode of MOS tube U18, the other end of resistance R34 is connected with the drain electrode of first MOS tube, the source electrode of MOS tube U18 and one end of resistance RL16 are all connected with the input end of voltage stabilizing chip U21, the other end of resistance RL16 is connected with ground through diode D9, the output end of voltage stabilizing chip U21, one end of resistance R46 and one end of capacitor C17 are all connected with the power supply end of drive chip U22, the other end of capacitor C17 is connected with ground, the other end of resistance R46 is connected with charge-discharge circuit, one end of resistance R48, one end of resistance R47 and one end of capacitor C18 are all connected with the logic input end of drive chip U22, the other end of resistance R47 is connected with the logic output end of drive chip U22 and charge-discharge circuit.

[0011] In the utility model, as an optional embodiment, the charge-discharge circuit includes second diode, second MOS tube, third MOS tube, fourth MOS tube, fifth MOS tube, the solid capacitor includes third capacitor, fourth capacitor, fifth capacitor, sixth capacitor, seventh capacitor, eighth capacitor and ninth capacitor, the other end of resistance R47 is connected with the IN pin of MOS tube drive chip, the other end of resistance R46 is connected with the SD pin of MOS tube drive chip, the VCC pin of MOS tube drive chip, one end of third capacitor and the positive pole of second diode are all connected with one end of resistance RL16, the other end of third capacitor is connected to the COM pin of MOS tube drive chip and the source electrode of fifth MOS tube respectively, the negative pole of second diode and one end of fourth capacitor are all connected with the VB pin of MOS tube drive chip, the other end of fourth capacitor is connected with the drain electrode of fifth MOS tube, the grid electrode of second MOS tube is connected with the high-end output pin of MOS tube drive chip, the grid electrode of fourth MOS tube is connected with the low-end output pin of MOS tube drive chip, the drain electrode of second MOS tube and one end of fifth capacitor are all connected with external power supply, the other end of fifth capacitor and the drain electrode of third MOS tube are connected with ground, the grid electrode of third MOS tube is connected with the grid electrode of second MOS tube, the source electrode of third MOS tube and one end of sixth capacitor are connected with the drain electrode of fifth MOS tube, the other end of sixth capacitor and the source electrode of second MOS tube are all connected with the drain electrode of fourth MOS tube, the source electrode of fourth MOS tube is connected with one end of seventh capacitor and one end of eighth capacitor, the source electrode of fifth MOS tube is also connected with the other end of seventh capacitor and the other end of eighth capacitor respectively, ninth capacitor is connected in parallel across the two ends of sixth capacitor.

[0012] In the utility model, as an optional embodiment, the model of the MOS tube driving chip is EG2104.

[0013] In the utility model, as an optional embodiment, the model of the driving chip U22 is SN74LVC1G14.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses set up the active equalizing circuit, including battery voltage circuit, control switch drive circuit and charge-discharge circuit, battery voltage circuit detects battery voltage state, when reaching equalizing starting state, control circuit conduction, and then make control switch drive circuit conduction and control output steady voltage, switch drive circuit as intermediate control link, ensure the accurate control of equalizing process, avoid the harm of the mutation of current or voltage to battery, and the charge-discharge circuit realizes the voltage balance between the single battery of battery pack inside through the intelligent control solid-state capacitor charge-discharge, improves the overall performance and security of battery pack, and the embodiment realizes the accurate control and equalizing adjustment of the single battery voltage of battery pack inside through the cooperative work of battery voltage circuit, control switch drive circuit and charge-discharge circuit, not only can improve the use efficiency of battery pack, but also can effectively prolong the service life of battery, reduces the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the module structure schematic drawing of BMS protection system with active equalizing circuit for the utility model embodiment;

[0017] Figure 2 It is the circuit structure schematic drawing of battery voltage circuit for the utility model embodiment;

[0018] Figure 3 It is the circuit structure schematic drawing of control switch drive circuit for the utility model embodiment;

[0019] Figure 4 It is the circuit structure schematic drawing of charge-discharge circuit for the utility model embodiment. DETAILED DESCRIPTION

[0020] The utility model is further described below in combination with the drawings and specific embodiments. It should be noted that the embodiments described below or the technical features between the embodiments can be combined to form new embodiments without conflict. Unless otherwise specified, the materials and equipment used in the embodiments can be purchased from the market. The examples of the embodiments are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the application and cannot be understood as limiting the application.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0022] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including 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.

[0024] The embodiment of the present application provides a BMS protection system with an active equalization circuit, which comprises an active equalization circuit. Figure 1As shown, the active balancing circuit includes a battery voltage circuit, a control switch driving circuit and a charge-discharge circuit, the battery voltage circuit is connected with the control switch driving circuit, the charge-discharge circuit is connected with the battery voltage circuit and the control switch driving circuit respectively, the battery voltage circuit is used for turning on in time when detecting the balancing starting voltage, and the control switch driving circuit is turned on; the control switch driving circuit is used for outputting stable voltage when being turned on; the charge-discharge circuit includes a MOS tube driving chip and a solid-state capacitor, and when the MOS tube driving chip receives high-level power supply, the high-end output pin and the low-end output pin of the MOS tube driving chip are changed from low level to high level, and when the external input forward signal or reverse signal is input, the level state of the high-end output pin and the low-end output pin is automatically adjusted to charge the solid-state capacitor.

[0025] The battery voltage circuit detects the battery voltage state, controls the circuit to be turned on when reaching the balancing starting state, and then controls the control switch driving circuit to be turned on and output stable voltage, the switch driving circuit serves as an intermediate control link to ensure the accurate control of the balancing process, avoid the damage to the battery caused by the sudden change of current or voltage, and the charge-discharge circuit realizes the voltage balance among the single batteries in the battery pack by intelligently controlling the charge and discharge of the solid-state capacitor, improves the overall performance and safety of the battery pack, and the embodiments realize the accurate control and balancing adjustment of the single battery voltage in the battery pack through the cooperative work of the battery voltage circuit, the control switch driving circuit and the charge-discharge circuit, which not only improves the use efficiency of the battery pack, but also effectively prolongs the service life of the battery and reduces the maintenance cost.

[0026] Please refer to Figure 2 , the battery voltage circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a balancing chip, a first diode, a triode and a first MOS tube, one end of the first resistor is connected with external power supply, one end of the first capacitor and the other end of the first resistor are connected with the VDD pin of the balancing chip, the other end of the first capacitor and the ground pin of the balancing chip are grounded, one end of the second resistor is connected with the output pin of the balancing chip, the other end of the second resistor and one end of the third resistor are connected with the base of the triode, the emitter of the triode and the other end of the third resistor are respectively connected with the external power supply, the collector of the triode is connected with the positive electrode of the first diode through the fourth resistor, the negative electrode of the first diode, one end of the fifth resistor and one end of the second battery are connected with the gate of the first MOS tube, the source of the first MOS tube, the other end of the fifth resistor and the other end of the second capacitor are grounded, and the drain of the first MOS tube is connected with the control switch driving circuit.

[0027] It should be noted that in practical application, the number of battery voltage circuits and the number of charge-discharge circuits are multiple groups. As preferred, the number of battery voltage circuits is 4 groups, the number of charge-discharge circuits is consistent with the number of battery voltage circuits, and the 4 groups of battery voltage circuits are all connected with the control switch driving circuit. That is, the control switch driving circuit remains one group.

[0028] Figure 2 One of the battery voltage circuits is shown in the middle, in which the first resistor is R28, the second resistor is R29, the third resistor is R30, the fourth resistor is R31, the fifth resistor is R35, the first capacitor is C8, the second capacitor is C10, the first diode is D10, the first MOS tube is Q9, the triode is U16, and the balancing chip is U15, in which the BC1 port represents the connected external power supply. In other groups, the ports of the external power supply can be BC2, BC3, BC4, etc. In other groups, the circuit components such as resistors and capacitors in the battery voltage circuit also have corresponding identifiers. For example, the first resistor in the battery voltage circuit of the other group can be R16.

[0029] As shown in Figure 3 The control switch driving circuit includes diode D9, MOS tube U18, resistor R32, resistor R34, resistor RL16, resistor R46, resistor R47, resistor R48, voltage stabilizing chip U21, driving chip U22, capacitor C17, and capacitor C18. One end of the resistor R32 and the drain of the MOS tube U18 are both connected with the external power supply. The other end of the resistor R32 and one end of the resistor R34 are both connected with the gate of the MOS tube U18. The other end of the resistor R34 is connected with the drain of the first MOS tube. The source of the MOS tube U18 and one end of the resistor RL16 are both connected with the input end of the voltage stabilizing chip U21. The other end of the resistor RL16 is connected with the ground through the diode D9. The output end of the voltage stabilizing chip U21, one end of the resistor R46, and one end of the capacitor C17 are all connected with the power supply end of the driving chip U22. The other end of the capacitor C17 is connected with the ground. The other end of the resistor R46 is connected with the charge-discharge circuit. One end of the resistor R48, one end of the resistor R47, and one end of the capacitor C18 are all connected with the logic input end of the driving chip U22. The other end of the resistor R47 is connected with the logic output end of the driving chip U22 and the charge-discharge circuit. Since there is only one group of control switch driving circuits in the embodiment, the identifier thereof is directly expressed in the embodiment. The model of the driving chip U22 is preferably SN74LVC1G14.

[0030] In combination Figure 4The charging and discharging circuit of the embodiment includes a second diode, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, the solid capacitor includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor, the IN pin of the MOS tube driving chip is connected to the other end of the resistance R47, the SD pin of the MOS tube driving chip is connected to the other end of the resistance R46, the VCC pin of the MOS tube driving chip, the positive electrode of the second diode and one end of the third capacitor are all connected to one end of the resistance RL16, the other end of the third capacitor is connected to the COM pin of the MOS tube driving chip and the source electrode of the fifth MOS tube respectively, the negative electrode of the second diode and one end of the fourth capacitor are both connected to the VB pin of the MOS tube driving chip, the other end of the fourth capacitor is connected to the drain electrode of the fifth MOS tube, the gate electrode of the second MOS tube is connected to the high-end output pin of the MOS tube driving chip, the gate electrode of the fourth MOS tube is connected to the low-end output pin of the MOS tube driving chip, the drain electrode of the second MOS tube and one end of the fifth capacitor are both connected to external power supply, the other end of the fifth capacitor and the drain electrode of the third MOS tube are grounded, the gate electrode of the third MOS tube is connected to the gate electrode of the second MOS tube, the source electrode of the third MOS tube and one end of the sixth capacitor are connected to the drain electrode of the fifth MOS tube, the other end of the sixth capacitor and the source electrode of the second MOS tube are both connected to the drain electrode of the fourth MOS tube, the source electrode of the fourth MOS tube is connected to one end of the seventh capacitor and one end of the eighth capacitor, the source electrode of the fifth MOS tube is also connected to the other end of the seventh capacitor and the other end of the eighth capacitor respectively, and the ninth capacitor is connected in parallel across the sixth capacitor.

[0031] As the charging and discharging circuit has multiple groups in actual application, and the circuit structure of each group is the same, the specific circuit structure described in the embodiment includes a second diode, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, etc. In the specific circuit diagram, each component has a corresponding identifier, as shown in the figure, the second diode is D8, the second MOS tube is U59, the third MOS tube is U60, the fourth MOS tube is U61, the fifth MOS tube is U62, the third capacitor is C61, the fourth capacitor is C62, the fifth capacitor is C63, the sixth capacitor is C64, the seventh capacitor is C23, the eighth capacitor is C29, and the ninth capacitor is C66. Figure 3

[0032] ​In the embodiment, the equalization chip U15 detects the battery voltage state, when reaching the equalization starting voltage, the CO output pin thereof changes from high level to low level, at this time, the triode U16 is turned on. The first MOS Q9 is also turned on. When the triode U16 and the first MOS Q9 are turned on, the MOS U18 is also turned on, at this time, the external battery voltage is guided to make the voltage stabilizing chip U21 work normally, the SD pin thereof outputs 3.3V voltage, the driving chip U22 also works normally, at this time, the Y pin thereof outputs the forward and reverse signals, and the IN pin also outputs the high and low level signals. In the charging and discharging circuit, when the SD pin of the MOS driving chip U58 is from high level, the HO pin and the LO pin thereof change from the original low level state to the high level state, the high and low levels of the two pins are controlled by the IN pin signal voltage, when the IN outputs the forward signal, the HO outputs the high level and the LO outputs the low level, when the IN outputs the reverse signal, the LO outputs the high level and the HO outputs the low level. When the HO outputs the high level, the second MOS U59 and the third MOS U60 are turned on, the solid capacitors C63 and C64 are charged from high to low. When the LO outputs the high level, the fourth MOS U61 and the fifth MOS U62 are turned on, the solid capacitors C64 and C23 are charged from high to low, and so on, thus the capacitor storage power can be used to realize the charging and discharging, the corresponding battery cell is supplemented, the active equalization effect is achieved, the problem that the capacity and voltage difference between the single batteries in the lithium battery pack are too large can be solved, the life of the whole battery pack is prolonged, and the safety and performance stability are improved.

[0033] Although only some parts and embodiments of the present application have been illustrated and described, many modifications and changes can be conceived by those skilled in the art without departing from the scope and spirit of the claims, for example: changes in size, dimension, structure, shape and proportion, mounting arrangement, material use, color, orientation, etc. of various elements.

[0034] The above-mentioned embodiments are only preferred embodiment modes of the embodiments of the present application, and cannot be used to limit the scope of protection of the embodiments of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the embodiments of the present application all belong to the scope of protection required by the embodiments of the present application.

Claims

1. A BMS protection system with active equalization circuit, comprising an active equalization circuit, characterized in that: The active balancing circuit comprises a battery voltage circuit, a control switch driving circuit and a charge-discharge circuit, the battery voltage circuit is connected with the control switch driving circuit, the charge-discharge circuit is connected with the battery voltage circuit and the control switch driving circuit respectively, the battery voltage circuit is used for turning on in time when the balancing starting voltage is detected, and the control switch driving circuit is turned on; the control switch driving circuit is used for outputting stable voltage when being turned on; the charge-discharge circuit comprises a MOS tube driving chip and a solid-state capacitor, and when the MOS tube driving chip receives high-level power supply, the high-end output pin and the low-end output pin of the MOS tube driving chip are changed from low level to high level, and when the external input positive signal or the reverse signal is input, the level state of the high-end output pin and the low-end output pin is automatically adjusted to charge the solid-state capacitor.

2. The BMS protection system with active equalization circuit according to claim 1, characterized in that, The number of the battery voltage circuits is four, the number of the charge-discharge circuits is consistent with the number of the battery voltage circuits, and the four battery voltage circuits are connected with the control switch driving circuit.

3. The BMS protection system with active equalization circuit of claim 1, wherein, The battery voltage circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a balancing chip, a first diode, a triode and a first MOS tube, one end of the first resistor is connected with external power supply, one end of the first capacitor and the other end of the first resistor are connected with the VDD pin of the balancing chip, the other end of the first capacitor and the ground pin of the balancing chip are grounded, one end of the second resistor is connected with the output pin of the balancing chip, the other end of the second resistor and one end of the third resistor are connected with the base of the triode, the emitter of the triode and the other end of the third resistor are connected with the external power supply respectively, the collector of the triode is connected with the positive electrode of the first diode through the fourth resistor, the negative electrode of the first diode, one end of the fifth resistor and one end of the second battery are connected with the gate of the first MOS tube, the source of the first MOS tube, the other end of the fifth resistor and the other end of the second capacitor are grounded, and the drain of the first MOS tube is connected with the control switch driving circuit.

4. The BMS protection system with active equalization circuit of claim 3, wherein, The control switch driving circuit comprises a diode D9, a MOS tube U18, a resistor R32, a resistor R34, a resistor RL16, a resistor R46, a resistor R47, a resistor R48, a voltage stabilizing chip U21, a driving chip U22, a capacitor C17 and a capacitor C18, one end of the resistor R32 and a drain of the MOS tube U18 are connected with external power supply, the other end of the resistor R32 and one end of the resistor R34 are connected with a gate of the MOS tube U18, the other end of the resistor R34 is connected with a drain of the first MOS tube, a source of the MOS tube U18 and one end of the resistor RL16 are connected with an input end of the voltage stabilizing chip U21, the other end of the resistor RL16 is connected with ground through the diode D9, an output end of the voltage stabilizing chip U21, one end of the resistor R46 and one end of the capacitor C17 are connected with a power supply end of the driving chip U22, the other end of the capacitor C17 is connected with ground, the other end of the resistor R46 is connected with the charge-discharge circuit, one end of the resistor R48, one end of the resistor R47 and one end of the capacitor C18 are connected with a logic input end of the driving chip U22, the other end of the resistor R47 is connected with a logic output end of the driving chip U22 and the charge-discharge circuit.

5. The BMS protection system with active equalization circuit of claim 4, wherein, The charge-discharge circuit comprises a second diode, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube, the solid-state capacitor comprises a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor, the IN pin of the MOS tube driving chip is connected with the other end of the resistor R47, the SD pin of the MOS tube driving chip is connected with the other end of the resistor R46, the VCC pin of the MOS tube driving chip, one end of the third capacitor and the positive electrode of the second diode are connected with one end of the resistor RL16, the other end of the third capacitor is connected with the COM pin of the MOS tube driving chip and the source of the fifth MOS tube respectively, the negative electrode of the second diode and one end of the fourth capacitor are connected with the VB pin of the MOS tube driving chip, the other end of the fourth capacitor is connected with the drain of the fifth MOS tube, the gate of the second MOS tube is connected with the high-end output pin of the MOS tube driving chip, the gate of the fourth MOS tube is connected with the low-end output pin of the MOS tube driving chip, the drain of the second MOS tube and one end of the fifth capacitor are connected with external power supply, the other end of the fifth capacitor and the drain of the third MOS tube are connected with ground, the gate of the third MOS tube is connected with the gate of the second MOS tube, the source of the third MOS tube and one end of the sixth capacitor are connected with the drain of the fifth MOS tube, the other end of the sixth capacitor and the source of the second MOS tube are connected with the drain of the fourth MOS tube, the source of the fourth MOS tube is connected with one end of the seventh capacitor and one end of the eighth capacitor, the source of the fifth MOS tube is also connected with the other end of the seventh capacitor and the other end of the eighth capacitor respectively, the ninth capacitor is connected in parallel across the sixth capacitor.

6. The BMS protection system with active equalization circuit of claim 5, wherein, The model of the MOS tube driving chip is EG2104.

7. The BMS protection system with active equalization circuit of claim 6, wherein, The model of the driving chip U22 is SN74LVC1G14.

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