Vehicle battery power supply detection system and detection method

Abstract

The present invention discloses a vehicle battery power supply detection system, which mainly solves the problem that the existing vehicle power supply detection system cannot realize the single-cell detection of the battery pack. The detection system includes a main control MCU, and a current input signal detection circuit, a current output signal detection circuit and a battery detection circuit connected to the main control MCU; wherein the battery detection circuit includes a plurality of voltage comparators connected to both ends of each battery cell, a control circuit connected to the output ends of the voltage comparators, and a switching switch connected to the control circuit for switching on and off between the battery and the load. The present invention detects whether the vehicle battery is in a charging state or a power supply state by setting a current input signal detection circuit and a current output signal detection circuit, thereby restarting the battery detection circuit to detect a single battery cell in the battery. By independently detecting a single battery cell of the battery, the battery status can be more efficiently fed back, thereby protecting the battery and the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle batteries, and in particular, relates to a vehicle battery power supply detection system and a detection method. Background Art

[0002] At present, electric vehicles are generally considered by scientists and industrial circles around the world to be an important means of transportation in the 21st century for their advantages of energy saving, zero pollution and high efficiency. Electric vehicles use unconventional automotive fuels as a power source, or use conventional automotive fuels and new on-board power devices, and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies and new structures. Pure electric vehicles are vehicles that use a single battery as a power source for energy storage. It uses batteries as a power source for energy storage, provides electricity to the motor through the battery, drives the motor to run, and thus drives the car. New energy vehicles are very important for the implementation of the basic national policy of protecting the environment, so the research and development efforts and production volume of new energy vehicles are increasing year by year.

[0003] The electric vehicle power supply detection system is an important detection device to ensure the safety of electric vehicle power supply. It is mainly achieved by detecting the battery of the electric vehicle. The battery of an electric vehicle is composed of multiple cells. The traditional electric vehicle battery detection is to detect the entire battery, that is, to detect that the voltage of the entire battery remains within a certain range, which is safe and the battery can continue to be charged. However, in this process, it is possible that some cells are full and some are not full, and the traditional detection circuit cannot detect it. It can only continue to charge the battery, which will cause the already full cells to be overcharged. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle battery power supply detection system and detection method, which mainly solves the problem that the existing vehicle power supply detection system cannot realize single-cell detection of battery packs.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A vehicle battery power supply detection system comprises a main control MCU, and a current input signal detection circuit, a current output signal detection circuit and a battery detection circuit connected to the main control MCU; wherein the battery detection circuit comprises a plurality of voltage comparators connected to both ends of each battery cell, a control circuit connected to the output ends of the voltage comparators, and a switching switch connected to the control circuit for switching on and off between the battery and the load; wherein the control circuit comprises a control chip, a feedback circuit and an early warning circuit connected to the control chip, an amplifier circuit connected to the feedback circuit, and a drive circuit connected to the amplifier circuit; wherein the drive circuit is connected to the switch.

[0007] Further, in the present invention, the feedback circuit includes a resistor R1 connected to the control chip, an operational amplifier A1 whose inverting input terminal is connected to the other end of the resistor R1, a resistor R2 whose one end is connected to the output end of the operational amplifier A1, an operational amplifier A2 whose inverting input terminal is connected to the other end of the resistor R2, a resistor R3 whose one end is connected to the inverting input end of the operational amplifier A2, a capacitor C1, a resistor R4 connected to the other end of the capacitor C1 and the other end of which is connected to the output end of the operational amplifier A2, a resistor R5 connected between the inverting input end and the output end of the operational amplifier A2, a resistor R6 connected to the other end of the resistor R3, an operational amplifier A3 whose inverting input terminal is connected to the other end of the resistor R6, a resistor R1 connected to the inverting input end of the operational amplifier A3 and the other end of which is connected to the control chip. 7, a capacitor C2 having one end connected to the resistor R7 and the control chip, a resistor R8 having one end connected to the other end of the capacitor C2 and the other end connected to the inverting input terminal of the operational amplifier A2, a capacitor C3 connected to the output terminal of the operational amplifier A2, a resistor R9 connected to the other end of the capacitor C3, an operational amplifier A4 having an inverting input terminal connected to the other end of the resistor R9, a resistor R10 connected between the inverting input terminal and the output terminal of the operational amplifier A4, a capacitor C4 having one end connected to the inverting input terminal of the operational amplifier A2 and the inverting input terminal of the operational amplifier A4, and a resistor R11 having one end connected to the other end of the capacitor C4 and the other end connected to the output terminal of the operational amplifier A4; wherein the non-inverting input terminals of the operational amplifiers A1 to A4 are all grounded; and the output terminal of the operational amplifier A4 is connected to the amplifying circuit.

[0008] Further, in the present invention, the early warning circuit includes a transistor T1 whose collector is connected to the control chip, a light-emitting diode D1 whose positive electrode is connected to the emitter of the transistor T1 and whose negative electrode is connected to the base of the transistor T1, a resistor R12 whose one end is connected to the base of the transistor T1, a resistor R13 whose one end is connected to the other end of the resistor R12 and whose other end is connected to the positive electrode of the light-emitting diode D1, a capacitor C5 connected in parallel to both ends of the resistor R13, a diode D2 whose positive electrode is connected to the common end of the resistors R12 and R13, an operational amplifier A5 whose output end is connected to the negative electrode of the diode D2, a resistor R14 connected between the non-inverting input terminal of the operational amplifier A5 and the positive electrode of the diode D2, a resistor R15 whose one end is connected to the non-inverting input terminal of the operational amplifier A5 and whose other end is grounded, and a resistor R16 whose one end is connected to the inverting input terminal of the operational amplifier A5 and whose other end is connected to the inverting input terminal of the operational amplifier A4.

[0009] Furthermore, in the present invention, the amplifying circuit includes a resistor R17 connected to the output end of the operational amplifier A4, an operational amplifier A6 connected to the other end of the resistor R17, resistors R18 and R19 connected to the non-inverting input end of the operational amplifier A6 at one end, a capacitor C6 connected to the other end of the resistor R18 at one end and grounded at the other end, a resistor R20 connected to the output end of the operational amplifier A6 at one end, and a capacitor C7 connected to the other end of the resistor R20 at one end and connected to the inverting input end of the operational amplifier A6 at the other end; wherein the other end of the resistor R19 is also connected to the output end of the operational amplifier A6, and the output end of the operational amplifier A6 is connected to the driving circuit.

[0010] Furthermore, in the present invention, the driving circuit includes a resistor R21 connected to the output end of the operational amplifier A6, a transistor T2 whose base is connected to the resistor R21, a resistor R22 connected between the base and the emitter of the transistor T2, and a capacitor C8 connected to the collector of the transistor T2, and an inductor L1 connected in parallel to both ends of the capacitor C8; wherein the other end of the capacitor C8 is connected to the switching switch; and the emitter of the transistor T2 is grounded.

[0011] Further, in the present invention, the current input signal detection circuit includes a buck converter connected to both ends of the battery pack, a resistor R23 connected to the output end of the buck converter, an operational amplifier A7 whose inverting input end is connected to the other end of the resistor R23, a resistor R4 connected between the inverting input end and the output end of the operational amplifier A7, a capacitor C9 connected in parallel to both ends of the resistor R24, a resistor R25 connected to the output end of the operational amplifier A7, a capacitor C10 having one end connected to the other end of the resistor R25 and the other end grounded, a diode D3 having a positive electrode connected to the common end of the resistor R25 and the capacitor C10 and a negative electrode connected to VCC, and a diode D4 having a negative electrode connected to the common end of the resistor R25 and the capacitor C10 and a positive electrode grounded; wherein, the common end of the resistor R25 and the capacitor C10 is also connected to the main control MCU.

[0012] Furthermore, in the present invention, the current output signal detection circuit includes a boost converter connected to both ends of the battery pack, a resistor R26 connected to the output end of the boost converter, a capacitor C11 having one end connected to the other end of the resistor R26 and the other end grounded, resistors R27 and R28 having one end connected in parallel to the common end of the resistor R26 and the capacitor C11, an operational amplifier A8 having an inverting input end connected to one end of the resistor R28 and a non-inverting input end connected to the other end of the resistor R27, a resistor R29 having one end connected to the non-inverting input end of the operational amplifier A8 and the other end grounded, and a resistor R30 connected between the inverting input end and the output end of the operational amplifier A8; wherein the output end of the operational amplifier A8 is also connected to the main control MCU.

[0013] Furthermore, in the present invention, the control chip adopts a DSP processing chip of model TMS320F2812.

[0014] Furthermore, in the present invention, the main control MCU adopts a single-chip microcomputer control chip of model STM32F103C8T6.

[0015] Based on the above detection circuit, the present invention also provides a detection method for a vehicle battery power supply detection system, comprising the following steps:

[0016] (S1) The detection system first detects whether the battery is in a charging state or a power supply state through a current input signal detection circuit and a current output signal detection circuit;

[0017] (S2) the main control MCU receives the detection signal and feeds back a control signal to start the battery detection circuit;

[0018] (S3) the battery detection circuit detects the state of a single cell by using a voltage comparator;

[0019] (S4) the feedback circuit receives the signal from the control circuit and feeds back the signal to the drive circuit and the early warning circuit;

[0020] (S5) The driving circuit controls the state of the switching switch to protect the battery and the load, and the early warning circuit issues an early warning message.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention detects whether the vehicle battery is in a charging state or a power supply state by setting a current input signal detection circuit and a current output signal detection circuit, thereby restarting the battery detection circuit to detect a single cell in the battery. By independently detecting a single cell of the battery, the battery status can be fed back more efficiently, thereby protecting the battery and the vehicle.

[0023] (2) The present invention can realize individual detection of the voltage of each battery cell in the battery by setting a voltage comparator at both ends of each battery cell. When the battery is in use or charging, the status of each battery cell can be individually detected and fed back through a feedback circuit, so that the charging of the battery cell can be stopped in time after the single battery cell is full, or the power can be cut off in time after a battery cell fails to protect the electrical equipment.

[0024] (3) The present invention sets a feedback circuit, collects the working status of each battery cell in the battery through the control chip, and uses the feedback circuit to provide feedback on the battery cell status, thereby controlling the switching switch to control the conduction and disconnection of the load to protect the load.

[0025] (4) The present invention provides an early warning circuit. After the control chip collects relevant abnormal data, the abnormal signal can be fed back to the early warning circuit through the feedback circuit, thereby issuing early warning information to protect the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall circuit principle block diagram of the present invention.

[0027] Figure 2 It is a principle block diagram of the battery detection circuit in the present invention.

[0028] Figure 3 This is a schematic diagram of the control circuit of the battery detection circuit in the present invention.

[0029] The names corresponding to the reference numerals are:

[0030] 1-battery cell, 2-voltage comparator, 3-switch, 4-load. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments of the present invention include but are not limited to the following embodiments.

[0032] Example

[0033] like Figures 1 to 3 As shown, a vehicle battery power supply detection system disclosed in the present invention includes a main control MCU, and a current input signal detection circuit, a current output signal detection circuit and a battery detection circuit connected to the main control MCU. It mainly uses a single-chip microcomputer control chip of model STM32F103C8T6 as the main control MCU. The current input signal detection circuit and the current output signal detection circuit detect whether the vehicle battery is in a charging state or a power supply state, so that the battery detection circuit is started by the main control MCU to detect a single battery cell in the battery. Through the independent detection of a single battery cell of the battery, the battery status can be more efficiently fed back, thereby protecting the battery and the vehicle.

[0034] In this embodiment, the battery detection circuit includes a plurality of voltage comparators 2 connected to both ends of each battery cell 1, a control circuit connected to the output ends of the voltage comparators, and a switch 3 connected to the control circuit for switching on and off between the battery and the load 4; wherein the control circuit includes a control chip, a feedback circuit and an early warning circuit connected to the control chip, an amplifier circuit connected to the feedback circuit, and a drive circuit connected to the amplifier circuit; wherein the drive circuit is connected to the switch. wherein the control chip adopts a DSP processing chip of model TMS320F2812. the present invention can realize the individual detection of the voltage of each battery cell in the battery by setting a voltage comparator at both ends of each battery cell of the battery, when the battery is used or charged, the state of each battery cell can be individually detected and fed back through the feedback circuit, and the feedback signal enters the amplifier circuit for amplification and then fed back to the drive circuit, thereby controlling the state of the switch through the drive circuit to protect the battery and the electrical equipment.

[0035] In this embodiment, the feedback circuit includes a resistor R1 connected to the control chip, an operational amplifier A1 whose inverting input terminal is connected to the other end of the resistor R1, a resistor R2 whose one end is connected to the output end of the operational amplifier A1, an operational amplifier A2 whose inverting input terminal is connected to the other end of the resistor R2, a resistor R3 whose one end is connected to the inverting input end of the operational amplifier A2, a capacitor C1, a resistor R4 connected to the other end of the capacitor C1 and the other end of which is connected to the output end of the operational amplifier A2, a resistor R5 connected between the inverting input end and the output end of the operational amplifier A2, a resistor R6 connected to the other end of the resistor R3, an operational amplifier A3 whose inverting input terminal is connected to the other end of the resistor R6, a resistor R7 whose one end is connected to the inverting input end of the operational amplifier A3 and the other end of which is connected to the control chip, A capacitor C2 having one end connected to the resistor R7 and the control chip, a resistor R8 having one end connected to the other end of the capacitor C2 and the other end connected to the inverting input of the operational amplifier A2, a capacitor C3 connected to the output of the operational amplifier A2, a resistor R9 connected to the other end of the capacitor C3, an operational amplifier A4 having an inverting input connected to the other end of the resistor R9, a resistor R10 connected between the inverting input and the output of the operational amplifier A4, a capacitor C4 having one end connected to the inverting input of the operational amplifier A2 and the inverting input of the operational amplifier A4, and a resistor R11 having one end connected to the other end of the capacitor C4 and the other end connected to the output of the operational amplifier A4; wherein the positive inputs of the operational amplifiers A1 to A4 are all grounded; and the output of the operational amplifier A4 is connected to the amplification circuit. The feedback circuit receives the abnormal working signal processed by the control chip, and feeds the signal back to the early warning circuit and the driving circuit, thereby controlling the switching switch and the early warning circuit.

[0036] In this embodiment, the early warning circuit includes a transistor T1 whose collector is connected to the control chip, a light-emitting diode D1 whose positive electrode is connected to the emitter of the transistor T1 and whose negative electrode is connected to the base of the transistor T1, a resistor R12 whose one end is connected to the base of the transistor T1, a resistor R13 whose one end is connected to the other end of the resistor R12 and whose other end is connected to the positive electrode of the light-emitting diode D1, a capacitor C5 connected in parallel to both ends of the resistor R13, a diode D2 whose positive electrode is connected to the common end of the resistors R12 and R13, an operational amplifier A5 whose output end is connected to the negative electrode of the diode D2, a resistor R14 connected between the non-inverting input terminal of the operational amplifier A5 and the positive electrode of the diode D2, a resistor R15 whose one end is connected to the non-inverting input terminal of the operational amplifier A5 and whose other end is grounded, and a resistor R16 whose one end is connected to the inverting input terminal of the operational amplifier A5 and whose other end is connected to the inverting input terminal of the operational amplifier A4. The circuit receives a feedback signal from a feedback circuit and utilizes a control circuit to enable the early warning circuit to issue early warning information.

[0037] In this embodiment, the amplifying circuit includes a resistor R17 connected to the output end of the operational amplifier A4, an operational amplifier A6 connected to the other end of the resistor R17, resistors R18 and R19 connected to the non-inverting input end of the operational amplifier A6 at one end, a capacitor C6 connected to the other end of the resistor R18 at one end and grounded at the other end, a resistor R20 connected to the output end of the operational amplifier A6 at one end, and a capacitor C7 connected to the other end of the resistor R20 at one end and connected to the inverting input end of the operational amplifier A6 at the other end; wherein the other end of the resistor R19 is also connected to the output end of the operational amplifier A6, and the output end of the operational amplifier A6 is connected to the driving circuit. The amplifying circuit is used to amplify the output signal of the feedback circuit.

[0038] In this embodiment, the driving circuit includes a resistor R21 connected to the output end of the operational amplifier A6, a transistor T2 whose base is connected to the resistor R21, a resistor R22 connected between the base and the emitter of the transistor T2, a capacitor C8 connected to the collector of the transistor T2, and an inductor L1 connected in parallel to both ends of the capacitor C8; wherein the other end of the capacitor C8 is connected to the switching switch; and the emitter of the transistor T2 is grounded.

[0039] In this embodiment, the current input signal detection circuit includes a buck converter connected to both ends of the battery pack, a resistor R23 connected to the output end of the buck converter, an operational amplifier A7 whose inverting input end is connected to the other end of the resistor R23, a resistor R4 connected between the inverting input end and the output end of the operational amplifier A7, a capacitor C9 connected in parallel to both ends of the resistor R24, a resistor R25 connected to the output end of the operational amplifier A7, a capacitor C10 having one end connected to the other end of the resistor R25 and the other end grounded, a diode D3 having a positive electrode connected to the common end of the resistor R25 and the capacitor C10 and a negative electrode connected to VCC, and a diode D4 having a negative electrode connected to the common end of the resistor R25 and the capacitor C10 and a positive electrode grounded; wherein the common end of the resistor R25 and the capacitor C10 is also connected to the main control MCU.

[0040] In this embodiment, the current output signal detection circuit includes a boost converter connected to both ends of the battery pack, a resistor R26 connected to the output end of the boost converter, a capacitor C11 having one end connected to the other end of the resistor R26 and the other end grounded, resistors R27 and R28 having one end connected in parallel to the common end of the resistor R26 and the capacitor C11, an operational amplifier A8 having an inverting input end connected to one end of the resistor R28 and a non-inverting input end connected to the other end of the resistor R27, a resistor R29 having one end connected to the non-inverting input end of the operational amplifier A8 and the other end grounded, and a resistor R30 connected between the inverting input end and the output end of the operational amplifier A8; wherein the output end of the operational amplifier A8 is also connected to the main control MCU.

[0041] The detection method of the vehicle battery power supply detection system of the present invention comprises the following steps:

[0042] (S1) The detection system first detects whether the battery is in a charging state or a power supply state through a current input signal detection circuit and a current output signal detection circuit;

[0043] (S2) the main control MCU receives the detection signal and feeds back a control signal to start the battery detection circuit;

[0044] (S3) the battery detection circuit detects the state of a single cell by using a voltage comparator;

[0045] (S4) the feedback circuit receives the signal from the control circuit and feeds back the signal to the drive circuit and the early warning circuit;

[0046] (S5) The driving circuit controls the state of the switching switch to protect the battery and the load, and the early warning circuit issues an early warning message.

[0047] After using this detection system, the cost of the charging cabinets for the corresponding matching vehicles will also be greatly reduced. Take a charging cabinet with 10 charging ports of a battery swap company as an example. The 10 charging ports serve 30 groups of single cells, and each group of batteries requires a protection board. After adopting the detection circuit of this system, since it is a single battery cell detection, only a protection board needs to be set at each charging port. Therefore, only 10 protection boards are needed for 10 charging ports, and each cabinet can save 20 protection boards, and the market value of a protection board is 350 to 400 yuan. Therefore, a cabinet can save at least 7,000 yuan in cost. The cost of the charging cabinet is greatly reduced.

[0048] Through the above design, the present invention detects whether the vehicle battery is in a charging state or a power supply state by setting a current input signal detection circuit and a current output signal detection circuit, thereby restarting the battery detection circuit to detect a single cell in the battery. By independently detecting a single cell of the battery, the battery status can be fed back more efficiently, thereby protecting the battery and the vehicle.

[0049] The above embodiment is only one of the preferred implementation modes of the present invention and should not be used to limit the protection scope of the present invention. Any changes or modifications that are made to the main design concept and spirit of the present invention and have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention.

Claims

1. A vehicle battery power supply detection system, characterized in that: It includes a main control MCU, and a current input signal detection circuit, a current output signal detection circuit and a battery detection circuit connected to the main control MCU; wherein the battery detection circuit includes a plurality of voltage comparators connected to both ends of each battery cell, a control circuit connected to the output ends of the voltage comparators, and a switching switch connected to the control circuit for switching on and off between the battery and the load; wherein the control circuit includes a control chip, a feedback circuit and an early warning circuit connected to the control chip, an amplifier circuit connected to the feedback circuit, and a drive circuit connected to the amplifier circuit; wherein the drive circuit is connected to the switch; wherein the current input signal detection circuit and the current output signal detection circuit detect whether the vehicle battery is in a charging state or a power supply state; The feedback circuit includes a resistor R1 connected to the control chip, an operational amplifier A1 whose inverting input terminal is connected to the other end of the resistor R1, a resistor R2 whose one end is connected to the output end of the operational amplifier A1, an operational amplifier A2 whose inverting input terminal is connected to the other end of the resistor R2, a resistor R3 whose one end is connected to the inverting input end of the operational amplifier A2, a capacitor C1, a resistor R4 connected to the other end of the capacitor C1 and the other end of which is connected to the output end of the operational amplifier A2, a resistor R5 connected between the inverting input end and the output end of the operational amplifier A2, a resistor R6 connected to the other end of the resistor R3, an operational amplifier A3 whose inverting input terminal is connected to the other end of the resistor R6, a resistor R7 whose one end is connected to the inverting input end of the operational amplifier A3 and the other end of which is connected to the control chip, a capacitor C2 whose one end is connected to the resistor R7 and the control chip, a resistor R8 whose one end is connected to the other end of the capacitor C2 and the other end of which is connected to the inverting input end of the operational amplifier A2, a capacitor C3 connected to the output end of the operational amplifier A2, and a capacitor C4 connected to the other end of the capacitor C1. A resistor R9 connected to the other end of C3, an operational amplifier A4 whose inverting input terminal is connected to the other end of the resistor R9, a resistor R10 connected between the inverting input terminal and the output terminal of the operational amplifier A4, a capacitor C4 whose one end is connected to the inverting input terminal of the operational amplifier A2 and the inverting input terminal of the operational amplifier A4, and a resistor R11 whose one end is connected to the other end of the capacitor C4 and whose other end is connected to the output terminal of the operational amplifier A4; wherein the non-inverting input terminals of the operational amplifiers A1 to A4 are all grounded; and the output terminal of the operational amplifier A4 is connected to the amplification circuit; The detection method of the detection system comprises the following steps: (S1) The detection system first detects whether the battery is in a charging state or a power supply state through a current input signal detection circuit and a current output signal detection circuit; (S2) The main control MCU receives the detection signal and feeds back a control signal to start the battery detection circuit; (S3) The battery detection circuit detects the state of a single cell through a voltage comparator; (S4) The feedback circuit receives the signal from the control circuit and feeds back the signal to the drive circuit and the early warning circuit; (S5) The driving circuit controls the state of the switching switch to protect the battery and the load, and the early warning circuit issues an early warning message.

2. A vehicle battery power supply detection system according to claim 1, characterized in that: The early warning circuit includes a transistor T1 whose collector is connected to the control chip, a light-emitting diode D1 whose positive electrode is connected to the emitter of the transistor T1 and whose negative electrode is connected to the base of the transistor T1, a resistor R12 whose one end is connected to the base of the transistor T1, a resistor R13 whose one end is connected to the other end of the resistor R12 and whose other end is connected to the positive electrode of the light-emitting diode D1, a capacitor C5 connected in parallel to both ends of the resistor R13, a diode D2 whose positive electrode is connected to the common end of the resistors R12 and R13, an operational amplifier A5 whose output end is connected to the negative electrode of the diode D2, a resistor R14 connected between the positive phase input terminal of the operational amplifier A5 and the positive electrode of the diode D2, a resistor R15 whose one end is connected to the positive phase input terminal of the operational amplifier A5 and whose other end is grounded, and a resistor R16 whose one end is connected to the inverting input terminal of the operational amplifier A5 and whose other end is connected to the inverting input terminal of the operational amplifier A4.

3. A vehicle battery power supply detection system according to claim 2, characterized in that: The amplifying circuit includes a resistor R17 connected to the output end of the operational amplifier A4, an operational amplifier A6 connected to the other end of the resistor R17, resistors R18 and R19 connected to the non-inverting input end of the operational amplifier A6 at one end, a capacitor C6 connected to the other end of the resistor R18 at one end and grounded at the other end, a resistor R20 connected to the output end of the operational amplifier A6 at one end, and a capacitor C7 connected to the other end of the resistor R20 at one end and connected to the inverting input end of the operational amplifier A6 at the other end; wherein the other end of the resistor R19 is also connected to the output end of the operational amplifier A6, and the output end of the operational amplifier A6 is connected to the driving circuit.

4. A vehicle battery power supply detection system according to claim 3, characterized in that: The driving circuit includes a resistor R21 connected to the output end of the operational amplifier A6, a transistor T2 whose base is connected to the resistor R21, a resistor R22 connected between the base and the emitter of the transistor T2, a capacitor C8 connected to the collector of the transistor T2, and an inductor L1 connected in parallel to both ends of the capacitor C8; wherein the other end of the capacitor C8 is connected to the switching switch; and the emitter of the transistor T2 is grounded.

5. A vehicle battery power supply detection system according to claim 4, characterized in that: The current input signal detection circuit includes a buck converter connected to both ends of the battery pack, a resistor R23 connected to the output end of the buck converter, an operational amplifier A7 whose inverting input end is connected to the other end of the resistor R23, a resistor R4 connected between the inverting input end and the output end of the operational amplifier A7, a capacitor C9 connected in parallel to both ends of the resistor R24, a resistor R25 connected to the output end of the operational amplifier A7, a capacitor C10 having one end connected to the other end of the resistor R25 and the other end grounded, a diode D3 having a positive electrode connected to the common end of the resistor R25 and the capacitor C10 and a negative electrode connected to VCC, and a diode D4 having a negative electrode connected to the common end of the resistor R25 and the capacitor C10 and a positive electrode grounded; wherein the common end of the resistor R25 and the capacitor C10 is also connected to the main control MCU.

6. A vehicle battery power supply detection system according to claim 5, characterized in that: The current output signal detection circuit includes a boost converter connected to both ends of the battery pack, a resistor R26 connected to the output end of the boost converter, a capacitor C11 having one end connected to the other end of the resistor R26 and the other end grounded, resistors R27 and R28 having one end connected in parallel to the common end of the resistor R26 and the capacitor C11, an operational amplifier A8 having an inverting input end connected to one end of the resistor R28 and a non-inverting input end connected to the other end of the resistor R27, a resistor R29 having one end connected to the non-inverting input end of the operational amplifier A8 and the other end grounded, and a resistor R30 connected between the inverting input end and the output end of the operational amplifier A8; wherein the output end of the operational amplifier A8 is also connected to the main control MCU.

7. A vehicle battery power supply detection system according to claim 6, characterized in that: The control chip adopts a DSP processing chip of model TMS320F2812.

8. A vehicle battery power supply detection system according to claim 7, characterized in that: The main control MCU adopts a single-chip microcomputer control chip of model STM32F103C8T6.

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