Battery pack overcurrent protection circuit and electric vehicle

Abstract

The utility model relates to a battery pack overcurrent protection circuit and an electric automobile. The battery pack overcurrent protection circuit comprises a current acquisition and amplification circuit, a comparison circuit, a voltage threshold setting circuit and a contactor control circuit, the current acquisition and amplification circuit comprises an acquisition unit and an amplification unit, and the acquisition unit is internally provided with a Shunt shunt resistor for detecting the loop current of the battery pack; a collection voltage is generated in the collection unit due to the current flowing through the Shunt shunt resistor, and the collection voltage is amplified by the amplification unit and then output to the comparison circuit; the comparison circuit receives voltage output from the voltage threshold setting circuit and the amplification unit and compares the output voltage of the voltage threshold setting circuit and the output voltage of the amplification unit; and when the comparison result meets the preset condition, the comparison circuit sends a control signal to the contactor control circuit so as to control the on-off of the battery pack loop. The over-current protection circuit of the battery pack provided by the utility model provides an over-current open-circuit protection circuit capable of self-recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a battery pack overcurrent protection circuit. In addition, the utility model also relates to an electric vehicle. Background Art

[0002] With the continuous advancement of carbon reduction requirements in the energy sector, new energy electric vehicles (hereinafter referred to as electric vehicles) have developed rapidly in the automotive industry, including SUVs, sedans, off-road vehicles, light pickup trucks and other vehicle types. When the high-voltage components on an electric vehicle are damaged, causing a short circuit in the external circuit of the battery pack, if the switch of the main circuit cannot be cut off in time, the excessive current may cause damage to the battery pack or the high-voltage components of the electric vehicle, or even cause combustion and fire, seriously affecting the life and property safety of the driver and passengers.

[0003] At present, battery pack overcurrent protection often uses fuses or fuses. According to the special material characteristics of the fuse, when overcurrent occurs, the fuse or fuse will instantly overheat and melt, playing a protective role. However, the fuse or fuse is a one-time protection component. Once it melts, it needs to be replaced and cannot be restored. However, the current battery pack pursues high density and small size, and the fuse or fuse is set inside the structure. Therefore, it is difficult to disassemble, replace and repair, and the maintenance cost is high. Utility Model Content

[0004] In view of this, the utility model aims to propose a battery pack overcurrent protection circuit to provide an overcurrent circuit breaker protection circuit that can self-recover.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack overcurrent protection circuit comprises a current acquisition and amplification circuit, a comparison circuit, a current threshold setting circuit and a contactor control circuit; the current acquisition and amplification circuit comprises an acquisition unit and an amplification unit, and the acquisition unit is provided with a Shunt shunt resistor R1 for detecting the battery pack loop current; a collection voltage is generated in the acquisition unit due to the current flowing through the Shunt shunt resistor R1, and the collection voltage is amplified by the amplification unit and then output to the comparison circuit;

[0007] The comparison circuit receives the voltage output from the current threshold setting circuit and the amplifying unit, and compares the output voltages of the current threshold setting circuit and the amplifying unit; when the comparison result meets a preset condition, the comparison circuit sends a control signal to the contactor control circuit to control the on and off of the battery pack circuit.

[0008] Furthermore, the acquisition unit is provided with at least one of a voltage-dividing resistor, a surge protection circuit and a capacitor filtering circuit.

[0009] Furthermore, it also includes a reference voltage circuit; the amplification unit includes an operational amplifier U1, and the operational amplifier U1 adopts the INA186A4IDCKR operational amplifier produced by Texas Instruments; the acquisition unit is connected to the IN+ and IN- ports of the operational amplifier U1, the reference voltage circuit is connected to the REF port of the operational amplifier U1, and the operational amplifier U1 outputs voltage to the comparison circuit through the OUT port.

[0010] Furthermore, an operational amplifier U2 is provided in the reference voltage circuit, and the operational amplifier U2 is a TLV2401CDBVR operational amplifier produced by Texas Instruments; a resistor R4 is provided between ports 2 and 3 of the operational amplifier U2, a resistor R5 is provided between ports 3 and 5 of the operational amplifier U2, and a capacitor C4 is provided between port 2 of the operational amplifier U2 and the power supply ground.

[0011] Furthermore, a dual comparator U3 is provided in the comparison circuit, and the dual comparator U3 adopts the TLV9022PWR dual precision comparator produced by Texas Instruments, and the current threshold setting circuit has two threshold voltage outputs; the first threshold voltage output of the current threshold setting circuit is connected to port 3 of the dual comparator U3, and the second threshold voltage output of the current threshold setting circuit is connected to port 6 of the dual comparator U3, the output voltage of the amplification unit is simultaneously connected to ports 2 and 5 of the dual comparator U3, and ports 1 and 7 of the dual comparator U3 are connected to the contactor control circuit.

[0012] Furthermore, a resistor R8 is provided between ports 1 and 8 of the dual comparator U3.

[0013] Furthermore, the current threshold setting circuit includes a digital-to-analog converter U4, and the digital-to-analog converter U4 adopts a DAC7562TDSCT digital-to-analog converter produced by Texas Instruments; the DIN, SCLK, LDAC, CLR and SYNC ports of the digital-to-analog converter U4 are all connected to the control unit of the battery pack to accept the threshold voltage setting from the control unit; the VOUTA and VOUTB ports of the digital-to-analog converter U4 are used to respectively output the two threshold voltages.

[0014] Furthermore, a resistor R6 and a resistor R7 are arranged in series between the LDAC and the CLR port, and a circuit between the resistor R6 and the resistor R7 is connected to a positive power supply electrode.

[0015] Furthermore, a capacitor C5 and a capacitor C6 are arranged in parallel between the positive power supply electrode and the AVDD port of the digital-to-analog converter U4.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery pack overcurrent protection circuit of the utility model can accurately detect the current change in the battery pack circuit by adopting a Shunt shunt resistor in the acquisition unit of the current acquisition amplifier circuit, and can make the overall power of the current acquisition amplifier circuit smaller; with the help of voltage amplification of the amplifier unit, the comparison circuit can timely determine whether the battery pack circuit current has an overcurrent condition by comparing the voltage threshold setting circuit and the output voltage of the amplifier unit. When an overcurrent occurs, the contactor in the battery pack circuit can be controlled to disconnect in time to protect the circuit; after the circuit fault is resolved, the contactor can be closed by a reset operation, thereby restoring the normal operation of the battery pack circuit, avoiding the replacement operation of the fuse, thereby providing a self-recovering overcurrent circuit breaker protection circuit.

[0018] In addition, by setting up a voltage divider resistor, a surge protection circuit, and a capacitor filter circuit in the acquisition unit, it is beneficial to improve the circuit's operating stability and the accuracy of current detection. By setting up a reference voltage circuit, the stability of the reference voltage in the current acquisition amplifier circuit can be guaranteed, thereby making the voltage value output by the current acquisition amplifier circuit more accurate.

[0019] Another object of the utility model is to provide an electric vehicle, wherein the electric vehicle is provided with the battery pack overcurrent protection circuit of the utility model. The electric vehicle of the utility model has the technical advantages possessed by the above-mentioned battery pack overcurrent protection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention. The directional terms such as front and back, top and bottom involved therein are only used to indicate relative positional relationships and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the battery pack overcurrent protection circuit according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the circuit principle of the current acquisition and amplification circuit described in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the circuit principle of the reference voltage circuit described in an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the circuit principle of the comparison circuit described in an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of the circuit principle of the voltage threshold setting circuit described in an embodiment of the utility model;

[0026] Description of reference numerals:

[0027] 1. Current collection and amplification circuit; 10. Collection unit; 11. Amplification unit;

[0028] 2. Reference voltage circuit; 3. Comparison circuit; 4. Voltage threshold setting circuit;

[0029] 5. Contactor control circuit; 6. Control unit. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be stated that if there are terms indicating directions or positional relationships such as "up, down, left, right, front, back, inside, outside", etc., they are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] Embodiment 1

[0035] This embodiment relates to a battery pack overcurrent protection circuit, which provides a self-recoverable overcurrent circuit breaker protection circuit; an exemplary system composition principle is as follows Figure 1 and Figure 2 shown.

[0036] In general, the battery pack overcurrent protection circuit includes a current acquisition and amplification circuit 1, a comparison circuit 3, a voltage threshold setting circuit 4 and a contactor control circuit 5; the current acquisition and amplification circuit 1 includes a collection unit 10 and an amplification unit 11, and the collection unit 10 is provided with a Shunt shunt resistor R1 for detecting the battery pack loop current; a collection voltage is generated in the collection unit 10 due to the current flowing through the Shunt shunt resistor R1, and the collection voltage is amplified by the amplification unit 11 and output to the comparison circuit 3; the comparison circuit 3 receives the voltage output from the voltage threshold setting circuit 4 and the amplification unit 11, and compares the output voltages of the voltage threshold setting circuit 4 and the amplification unit 11; when the comparison result meets the preset conditions, the comparison circuit 3 sends a control signal to the contactor control circuit 5 to control the on and off of the battery pack loop.

[0037] It should be pointed out that based on the above-mentioned overall design concept, the technical solution of the utility model can adopt a variety of different specific implementation structures, forms or configuration sequences. Among them, the voltage divider and filter elements in each circuit diagram can be specifically designed in a variety of different forms; they can be reasonably adjusted under the principle of electrical specification adaptation. For the resistors, capacitors, diodes and functional chips used in each circuit, existing mature products can be used, and reasonable selection can be made based on the requirements of electrical specifications and functional needs, and they are not limited to the products listed below.

[0038] For the parts required for the implementation of the overall solution but not involved in the above-mentioned overall settings, reasonable and flexible designs can also be made with reference to the mature setting means in the field, the actual situation during implementation, etc. The specific implementation scheme described below in this embodiment is only a better one among the many schemes that can be formed by the above-mentioned various combinations and their changes. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many schemes that can be formed by the above-mentioned various specific forms of combination and its changes, as well as the specific implementation scheme of this embodiment, are all within the scope of protection of this utility model.

[0039] In this embodiment, the acquisition unit 10 is provided with a voltage-dividing resistor, a surge protection circuit, and a capacitor filtering circuit. Of course, the above-mentioned voltage-dividing resistor, surge protection circuit, and capacitor filtering circuit can be flexibly set, and only one or two of them can be set, or all of them can be set. However, the acquisition unit 10 of this embodiment, by setting the voltage-dividing resistor, surge protection circuit, and capacitor filtering circuit in the acquisition unit 10, is conducive to improving the operating stability of the circuit and the accuracy of current detection. Specifically, Figure 2As shown, resistors R2 and R3 are arranged in series in the loop of the Shunt shunt resistor R1. A capacitor filter circuit and a surge protection circuit are arranged in parallel with the Shunt shunt resistor R1 in the loop; wherein the capacitor filter circuit includes a capacitor C1 and a capacitor C2 connected in series, and the circuit between the capacitor C1 and the capacitor C2 is grounded. The surge protection circuit is composed of a diode D1, a diode D2, a diode D4 and a diode D3 connected in series in sequence, and the circuit between the diode D2 and the diode D4 is grounded. At the same time, based on the fact that the operational amplifier U1 described below adopts the INA186A4IDCKR operational amplifier produced by Texas Instruments, the two ends of the circuit of the acquisition unit 10 are respectively connected to the IN+ and IN- ports of the operational amplifier U1, and a capacitor C3 located between the two ends of the circuit is also provided in the acquisition unit 10.

[0040] In addition, the battery pack overcurrent protection circuit of this embodiment also includes a reference voltage circuit 2; the amplification unit 11 includes an operational amplifier U1. Among them, the operational amplifier U1 preferably adopts the INA186A4IDCKR operational amplifier produced by Texas Instruments. Based on the above-mentioned settings, the acquisition unit 10 of this embodiment is connected to the IN+ and IN- ports of the operational amplifier U1, the reference voltage circuit 2 is connected to the REF port of the operational amplifier U1, and the operational amplifier U1 outputs the voltage to the comparison circuit 3 through the OUT port. By setting the reference voltage circuit 2, the stability of the reference voltage in the current acquisition amplifier circuit 1 can be guaranteed, so that the voltage value output by the current acquisition amplifier circuit 1 is more accurate. The INA186A4IDCKR operational amplifier is used in the amplification unit 11, which has the characteristics of stable performance, mature and reliable technology, and is easy to purchase.

[0041] At the same time, if Figure 3 As shown, the reference voltage circuit 2 of this embodiment is provided with an operational amplifier U2, and the operational amplifier U2 is preferably a TLV2401CDBVR operational amplifier produced by Texas Instruments. Among them, a resistor R4 is provided between ports 2 and 3 of the operational amplifier U2, a resistor R5 is provided between ports 3 and 5 of the operational amplifier U2, and a capacitor C4 is provided between port 2 of the operational amplifier U2 and the power supply ground. The resistor and capacitor elements are provided in the reference voltage circuit 2, which can play a good role in voltage division and filtering, so that the reference voltage output of the reference voltage circuit 2 is more stable and reliable.

[0042] Of course, the above-mentioned comparison circuit 3 has various design forms. Figure 4As shown, in this embodiment, a dual comparator U3 is provided in the comparison circuit 3, and the dual comparator U3 adopts the TLV9022PWR dual precision comparator produced by Texas Instruments; at the same time, the voltage threshold setting circuit 4 has two threshold voltage outputs; the first threshold voltage output of the voltage threshold setting circuit 4 is connected to the 3 port of the dual comparator U3, and the second threshold voltage output of the voltage threshold setting circuit 4 is connected to the 6 port of the dual comparator U3, the output voltage of the amplification unit 11 is simultaneously connected to the 2 and 5 ports of the dual comparator U3, and the 1 and 7 ports of the dual comparator U3 are connected to the contactor control circuit 5.

[0043] The comparison circuit 3 uses a dual comparator U3, which is beneficial to its two comparators U3.1 and U3.2, which can respectively detect the current and compare the voltage for the two different current directions when the battery pack is charged and discharged; due to the different working conditions of the battery pack charging or discharging, the voltage output by the OUT port of the operational amplifier U1 may be positive or negative; U3.1 and U3.2 of the dual comparator U3 can perform comparison processing respectively. In this embodiment, the following definitions can be made: Figure 4 The comparator U3.1 in the upper middle compares positive voltage, and the comparator U3.2 in the lower middle compares negative voltage. It also specifies whether the direction of the current is positive or negative. The two comparators compare currents flowing in different directions, respectively, to meet the overcurrent protection requirements of the battery pack under different operating conditions.

[0044] Based on the above settings, a resistor R8 may be further provided between ports 1 and 8 of the dual comparator U3 of this embodiment. By providing the resistor R8 in the comparison circuit 3, the voltage output by the output port EN of the comparison circuit 3 may be better matched with the voltage required by the contactor control circuit 5, so that the control action of the contactor by the contactor control circuit 5 may be more accurate and stable.

[0045] like Figure 5 As shown, the voltage threshold setting circuit 4 of this embodiment includes a digital-to-analog converter U4, and the digital-to-analog converter U4 preferably adopts a DAC7562TDSCT digital-to-analog converter produced by Texas Instruments. Among them, the DIN, SCLK, LDAC, CLR and SYNC ports of the digital-to-analog converter U4 are all connected to the control unit 6 of the battery pack to receive the threshold voltage setting from the control unit 6; the VOUTA and VOUTB ports of the digital-to-analog converter U4 are used to output two threshold voltages respectively; Figure 5 and Figure 4 As shown, Figure 3 In the middle, EN is relative to the action, and the two threshold voltage outputs LIMITA and LIMITB are set with different threshold voltages, corresponding to U3.1 and U3.2 of the dual comparator U3 respectively; when the comparison result determines that the battery pack circuit is overcurrent, Figure 4The EN output circuit potential in the battery pack is pulled down and directly pulled to the ground, thereby triggering the contactor control circuit 5 to operate, thereby disconnecting the contactor of the battery pack circuit.

[0046] The above-mentioned control unit 6 can adopt the MCU (Microcontroller Unit) chip of the battery pack. The MCU is a mature chip widely used in battery packs. It has rich command output ports. The threshold voltage can be set in the MCU through the vehicle computer and sent to the digital-to-analog converter U4 through it.

[0047] The DAC7562TDSCT digital-to-analog converter produced by Texas Instruments is used in the voltage threshold setting circuit 4, which can well realize the flexible setting of different threshold voltages; and the DAC7562TDSCT digital-to-analog converter produced by Texas Instruments has technical advantages such as rich ports and stable performance.

[0048] Based on the setting of the voltage threshold setting circuit 4, in this embodiment, resistors R6 and R7 are also connected in series between the LDAC and CLR ports of the digital-to-analog converter U4, and the circuit between resistors R6 and R7 is connected to the positive power supply electrode. At the same time, capacitors C5 and C6 can also be set in parallel between the positive power supply electrode and the AVDD port of the digital-to-analog converter U4. By setting a voltage-dividing resistor between the relevant ports, the voltage specifications between the output port of the control unit 6 and the input port of the digital-to-analog converter U4 can be accurately adapted; the setting of the capacitor element is conducive to ensuring the voltage stability of the digital-to-analog converter U4.

[0049] Based on the above overall configuration, the working principle of the battery pack overcurrent protection circuit of this embodiment is as follows:

[0050] The MCU sets the overcurrent voltage threshold. The overcurrent thresholds for the charging process and the discharging process can be set separately. The Shunt shunt resistor R1 in the acquisition unit 10 detects the current change in the battery pack circuit to realize the circuit current value acquisition. After amplification by the amplifier unit 11, the comparison circuit 3 compares the voltage output from the voltage threshold setting circuit and the amplifier unit. When an overcurrent is detected, the output level control signal is used to directly control the contactor to disconnect and feedback the current state of the MCU. When overcurrent occurs, the EN output port of the comparison circuit changes from a high level to a low level, and the contactor is disconnected. When the MCU detects a low level, it will delay for a period of time and then check the state of EN. If EN is at a low level, it means that an overcurrent has occurred.

[0051] In summary, the battery pack overcurrent protection circuit of the present embodiment can accurately detect the current change in the battery pack circuit by adopting the Shunt shunt resistor R1 in the acquisition unit 10 of the current acquisition and amplification circuit 1, and can make the overall power of the current acquisition and amplification circuit 1 smaller; with the help of the voltage amplification of the amplification unit 11, the comparison circuit 3 can promptly determine whether the battery pack circuit current has an overcurrent condition by comparing the output voltage of the voltage threshold setting circuit 4 and the amplification unit 11. When an overcurrent occurs, the contactor in the battery pack circuit can be promptly controlled to disconnect to protect the circuit; after the circuit fault is resolved, the contactor can be closed by a reset operation to restore the normal operation of the battery pack circuit, thereby avoiding the replacement of the fuse, thereby providing a self-recovering overcurrent circuit breaker protection circuit.

[0052] Embodiment 2

[0053] The present embodiment relates to an electric vehicle, which is provided with the battery pack overcurrent protection circuit provided in the first embodiment, so as to realize overcurrent protection of the battery pack circuit.

[0054] By configuring the battery pack overcurrent protection circuit of the utility model for the battery pack of the electric vehicle, the overcurrent protection of the battery pack during the charging and discharging process can be realized, and the self-recovery of the entire circuit after the overcurrent protection can be realized, and the corresponding threshold setting of the overcurrent current is supported. The circuit scheme has a simple structure, high reliability and good practicality.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack overcurrent protection circuit, characterized in that: It includes a current acquisition and amplification circuit, a comparison circuit, a voltage threshold setting circuit and a contactor control circuit; The current collection and amplification circuit includes a collection unit and an amplification unit, and the collection unit is provided with a Shunt shunt resistor R1 for detecting the battery pack loop current; a collection voltage is generated in the collection unit due to the current flowing through the Shunt shunt resistor R1, and the collection voltage is amplified by the amplification unit and then output to the comparison circuit; The comparison circuit receives the voltage output from the voltage threshold setting circuit and the amplifying unit, and compares the output voltages of the voltage threshold setting circuit and the amplifying unit; when the comparison result meets a preset condition, the comparison circuit sends a control signal to the contactor control circuit to control the on and off of the battery pack circuit.

2. The battery pack overcurrent protection circuit according to claim 1, characterized in that: The acquisition unit is provided with at least one of a voltage dividing resistor, a surge protection circuit and a capacitor filtering circuit.

3. The battery pack overcurrent protection circuit according to claim 1, characterized in that: Also included is a reference voltage circuit; The amplification unit includes an operational amplifier U1, and the operational amplifier U1 is an INA186A4IDCKR operational amplifier produced by Texas Instruments; The acquisition unit is connected to the IN+ and IN- ports of the operational amplifier U1, the reference voltage circuit is connected to the REF port of the operational amplifier U1, and the operational amplifier U1 outputs a voltage to the comparison circuit through an OUT port.

4. The battery pack overcurrent protection circuit according to claim 3, characterized in that: The reference voltage circuit is provided with an operational amplifier U2, and the operational amplifier U2 is a TLV2401CDBVR operational amplifier produced by Texas Instruments; A resistor R4 is provided between ports 2 and 3 of the operational amplifier U2, a resistor R5 is provided between ports 3 and 5 of the operational amplifier U2, and a capacitor C4 is provided between port 2 of the operational amplifier U2 and the power supply ground.

5. The battery pack overcurrent protection circuit according to any one of claims 1 to 4, characterized in that: The comparison circuit is provided with a dual comparator U3, the dual comparator U3 adopts the TLV9022PWR dual precision comparator produced by Texas Instruments, and the voltage threshold setting circuit has two threshold voltage outputs; The first threshold voltage output of the voltage threshold setting circuit is connected to port 3 of the dual comparator U3, the second threshold voltage output of the voltage threshold setting circuit is connected to port 6 of the dual comparator U3, the output voltage of the amplification unit is simultaneously connected to ports 2 and 5 of the dual comparator U3, and ports 1 and 7 of the dual comparator U3 are connected to the contactor control circuit.

6. The battery pack overcurrent protection circuit according to claim 5, characterized in that: A resistor R8 is provided between ports 1 and 8 of the dual comparator U3.

7. The battery pack overcurrent protection circuit according to claim 5, characterized in that: The voltage threshold setting circuit includes a digital-to-analog converter U4, and the digital-to-analog converter U4 adopts a DAC7562TDSCT digital-to-analog converter produced by Texas Instruments; The DIN, SCLK, LDAC, CLR and SYNC ports of the digital-to-analog converter U4 are all connected to the control unit of the battery pack to accept the threshold voltage setting from the control unit; the VOUTA and VOUTB ports of the digital-to-analog converter U4 are used to respectively output the two threshold voltages.

8. The battery pack overcurrent protection circuit according to claim 7, characterized in that: A resistor R6 and a resistor R7 are arranged in series between the LDAC and the CLR port, and a circuit between the resistor R6 and the resistor R7 is connected to a positive power supply electrode.

9. The battery pack overcurrent protection circuit according to claim 8, characterized in that: A capacitor C5 and a capacitor C6 are connected in parallel between the positive power supply electrode and the AVDD port of the digital-to-analog converter U4.

10. An electric vehicle, characterized in that: The electric vehicle is provided with a battery pack overcurrent protection circuit as claimed in any one of claims 1 to 9.

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