Backup power circuit in electric vehicle battery replacement system

Abstract

This invention relates to the field of electric vehicle battery swapping technology, specifically to a backup power circuit in an electric vehicle battery swapping system. It achieves multi-channel power input, inter-channel switching, and secure isolation between channels. The technical solution can be summarized as follows: it includes a communication circuit, a processor circuit, and a multi-channel battery isolation switching circuit. The multi-channel battery isolation switching circuit includes a power output terminal and at least one power input terminal. The communication circuit is connected to the processor circuit, and the processor circuit is connected to the multi-channel battery isolation switching circuit. The power output terminal of the multi-channel battery isolation switching circuit is used to connect to the power input terminal of the battery swapping system, and the power input terminal is used to connect one-to-one with the batteries in the battery swapping compartment of the battery swapping system. The multi-channel battery isolation switching circuit can switch the power input terminal connected to the power output terminal and is suitable for backup power circuits in electric vehicle battery swapping systems.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle battery replacement, and in particular to a backup power supply circuit in an electric vehicle battery replacement system. Background Art

[0002] With the continuous development of various express-related service industries, electric cars and electric tricycles are widely used as transportation and transport tools in these industries. In addition, the electric vehicles used in these industries are of a single model, with high power requirements and frequent charging. Therefore, due to actual needs in recent years, a large number of battery replacement systems specifically for electric vehicles used in express-related industries have emerged. Because this battery replacement system is arranged by region, when a certain area is out of power, even if all batteries in the battery replacement system are fully charged, the battery replacement business cannot be carried out, so a backup power supply for the above battery replacement system is very necessary.

[0003] The backup power supply of the prior art requires the use of an independent backup battery to provide power, or a gasoline generator or a diesel generator to provide power. The prior art solutions all require the use of an independent external backup power supply, which requires frequent maintenance, is costly, has a single input source, is not very safe, and is difficult to achieve seamless switching of the backup power supply at the first moment of power outage. Summary of the invention

[0004] The purpose of the present invention is to provide a backup power supply circuit in an electric vehicle battery replacement system, which no longer requires an independent backup power supply, can realize multi-channel power input, switching between channels, and safe isolation of each channel, and seamless switching of the backup power supply and the main power supply.

[0005] The present invention adopts the following technical scheme to achieve the above-mentioned purpose. The backup power supply circuit in the electric vehicle battery replacement system includes a communication circuit, a processor circuit and a multi-channel battery isolation switching circuit. The multi-channel battery isolation switching circuit includes a power output end and at least one power input end. The communication circuit is connected to the processor circuit, and the processor circuit is connected to the multi-channel battery isolation switching circuit. The power output end of the multi-channel battery isolation switching circuit is used to be connected to the power supply input end of the battery replacement system. The power input end of the multi-channel battery isolation switching circuit is used to be connected one-to-one with the batteries in the battery replacement compartment of the battery replacement system. The multi-channel battery isolation switching circuit can switch the power input end connected to the power output end.

[0006] The processor circuit receives battery selection information sent from an external main control system through a communication circuit, and controls the multi-channel battery isolation switching circuit to access one or more corresponding batteries according to the battery selection information.

[0007] Furthermore, in order to improve the communication capability of the communication circuit and optimize the communication circuit, the communication circuit includes a TJA1050 transceiver chip, a power supply 1, a resistor 22, a resistor 23, a capacitor 20, a capacitor 21, a capacitor 22, a connector 2 and a PSM712 transient suppression diode array, the RXD pin and the TXD pin of the TJA1050 transceiver chip are connected to the processor circuit, the GND pin is grounded, the S pin is grounded, the VCC pin is connected to the power supply 1, the CANL pin is connected to the pin 1 of the connector 2, the CANL pin of the TJA1050 transceiver chip is also connected to one end of the resistor 22, the other end of the resistor 22 is grounded, the other end of the resistor 22 is also connected to one end of the capacitor 20, and the other end of the capacitor 20 is connected to the Pin one is connected, the CANH pin of the TJA1050 transceiver chip is connected to pin two of connector two, the CANH pin of the TJA1050 transceiver chip is also connected to one end of resistor twenty-three, the other end of resistor twenty-three is grounded, the other end of resistor twenty-three is also connected to one end of capacitor twenty-two, the other end of capacitor twenty-two is connected to pin two of connector two, the other end of resistor twenty-three is also connected to pin three of the PSM712 transient suppression diode array, pin two of the PSM712 transient suppression diode array is connected to pin two of connector two, pin two of the PSM712 transient suppression diode array is also connected to the CANH pin of the TJA1050 transceiver chip, and pin one of the PSM712 transient suppression diode array is connected to pin one of connector two.

[0008] Furthermore, in order to reduce costs and optimize processor circuits, the processor circuit includes an STM32F103C8T6 single-chip microcomputer, a crystal oscillator circuit, an ID design circuit, a power-on reset circuit, an operation indication circuit and a connector circuit, the crystal oscillator circuit is connected to the STM32F103C8T6 single-chip microcomputer, the ID design circuit is connected to the STM32F103C8T6 single-chip microcomputer, the power-on reset circuit is connected to the STM32F103C8T6 single-chip microcomputer, the operation indication circuit is connected to the STM32F103C8T6 single-chip microcomputer, and the connector circuit is connected to the STM32F103C8T6 single-chip microcomputer.

[0009] Furthermore, in order to optimize the multi-channel battery isolation switching circuit, the multi-channel battery isolation switching circuit includes at least two single-channel battery isolation circuits, the positive poles of the power output ends of the multiple single-channel battery isolation circuits are connected, the negative poles of the power output ends of the multiple single-channel battery isolation circuits are connected, the positive pole of the power output end is connected to the positive pole of the power supply input end of the battery replacement system, and the negative pole of the power output end is connected to the negative pole of the power supply input end of the battery replacement system. The single-channel battery isolation circuit includes resistor thirty-two, resistor thirty-three, resistor thirty-four, power supply three, light-emitting diode three, MOS tube, fuse, HF115F-012-2HS4 relay, diode and connector four, the anode of the light-emitting diode three is connected to the power supply three, the cathode is connected to one end of resistor thirty-two, the other end of resistor thirty-two is connected to the drain of the MOS tube, the source of the MOS tube is grounded, the source of the MOS tube is also connected to one end of resistor thirty-four, and the other end of resistor thirty-four is connected to the gate of the MOS tube. The gate of the tube is also connected to one end of resistor thirty-three, the other end of resistor thirty-three is connected to the processor circuit, the other end of resistor thirty-two is also connected to pin one of the HF115F-012-2HS4 relay, pin one of the HF115F-012-2HS4 relay is also connected to the anode of the diode, the cathode of the diode is connected to power supply three, pin six of the HF115F-012-2HS4 relay is connected to power supply three, pin six of the HF115F-012-2HS4 relay is also connected to the cathode of the diode, pin one of connector four is connected to pin four of the HF115F-012-2HS4 relay, pin two of connector four is connected to pin three of the HF115F-012-2HS4 relay, pin five of the HF115F-012-2HS4 relay is connected to the negative pole of the power output terminal, pin two of the HF115F-012-2HS4 relay is connected to one end of the fuse, and the other end of the fuse is connected to the positive pole of the power output terminal. The batteries in the battery swap compartment of the battery swap system are connected to the circuit through the J4 connector.

[0010] Furthermore, in order to deal with the temporary power shortage when the relay is working, the backup power supply circuit in the electric vehicle battery replacement system also includes a high-voltage support circuit, which is connected to the multi-channel battery isolation switching circuit. The high-voltage support circuit includes at least two capacitors, and the multiple capacitors are connected in parallel.

[0011] Furthermore, in order to increase the anti-interference capability and improve the circuit safety, the backup power supply circuit in the electric vehicle battery replacement system also includes an electromagnetic isolation and power conversion circuit, which is connected to the high-voltage support circuit. The electromagnetic isolation and power conversion circuit includes a flyback isolation transformer wound with an ER2834 magnetic core and a MOS tube, and the MOS tube is connected to the flyback isolation transformer.

[0012] Furthermore, in order to obtain high-frequency signals and improve signal quality, the backup power supply circuit in the electric vehicle battery replacement system also includes a high-frequency generating circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency generating circuit includes an NCP1271 flyback switch control chip, and the NCP1271 flyback switch control chip is connected to the electromagnetic isolation and power conversion circuit.

[0013] Furthermore, in order to improve heat dissipation and increase the output current capability, the backup power supply circuit in the electric vehicle battery replacement system also includes a high-frequency rectification and filtering circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency rectification and filtering circuit includes at least two TO220 packaged dual diodes and two capacitors, and the TO220 packaged dual diodes are connected to the capacitors.

[0014] Furthermore, in order to avoid power-off fluctuations, the backup power supply circuit in the electric vehicle battery replacement system also includes a low-voltage support circuit, which is connected to the high-frequency rectification and filtering circuit. The low-voltage support circuit includes at least two capacitors, and the multiple capacitors are connected in parallel.

[0015] Furthermore, in order to facilitate the switching of the main power supply and the backup power supply, the backup power supply circuit in the electric vehicle battery replacement system also includes a voltage input and output adaptive circuit, and the voltage input and output adaptive circuit includes at least two diodes, and the cathodes of the multiple diodes are connected in parallel.

[0016] The beneficial effects of the present invention are that no additional backup batteries are needed, multi-channel power input can be realized, channels can be switched with each other, each channel is safely isolated, and the backup power supply and the main power supply can be switched seamlessly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a circuit block diagram of the present invention.

[0018] Figure 2 1 is a circuit diagram of an embodiment of the present invention.

[0019] Figure 3 It is a communication circuit schematic diagram of the present invention.

[0020] Figure 4 It is a circuit block diagram of the processor of the present invention.

[0021] Figure 5 It is a schematic diagram of a single-channel battery isolation circuit of the present invention.

[0022] In the accompanying drawings, R22 is resistor twenty-two, R23 is resistor twenty-three, R32 is resistor thirty-two, R33 is resistor thirty-three, R34 is resistor thirty-four, C20 is capacitor twenty, C21 is capacitor twenty-one, C22 is capacitor twenty-two, U6 is TJA1050 transceiver chip, V1 is power supply one, J2 is connector two, PSM712 is transient suppression diode array, LED3 is light emitting diode three, Q3 is MOS tube, K2 is HF115F-012-2HS4 relay, J4 is connector four, B+ is the positive pole of power output, B- is the negative pole of power output, F2 is fuse, 1 is TXD pin, 2 is GND pin, 3 is VCC pin, 4 is RXD pin, 5 is Vref pin, 6 is CANL pin, 7 is CANH Pin, 8 is the S pin, 9 is the J2 connector pin one, 10 is the J2 connector pin two, 11 is the PSM712 TVS diode array pin one, 12 is the PSM712 TVS diode array pin two, 13 is the PSM712 TVS diode array pin three, a is the HF115F-012-2HS4 relay pin one, b is the HF115F-012-2HS4 relay pin two, c is the HF115F-012-2HS4 relay pin three, d is the HF115F-012-2HS4 relay pin four, e is the HF115F-012-2HS4 relay pin five, f is the HF115F-012-2HS4 relay pin six, g is the J4 connector pin one, and h is the J4 connector pin two. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The backup power supply circuit in the electric vehicle battery replacement system of the present invention has a circuit block diagram as shown in FIG. Figure 1 , including a communication circuit, a processor circuit and a multi-channel battery isolation switching circuit, the multi-channel battery isolation switching circuit including a power output end and at least one power input end, the communication circuit is connected to the processor circuit, the processor circuit is connected to the multi-channel battery isolation switching circuit, the power output end of the multi-channel battery isolation switching circuit is used to connect to the power supply input end of the battery exchange system, the power input end of the multi-channel battery isolation switching circuit is used to be connected one-to-one with the batteries in the battery exchange compartment of the battery exchange system, and the multi-channel battery isolation switching circuit can switch the power input end connected to the power output end.

[0025] The processor circuit receives battery selection information sent by the external main control system through the communication circuit, and controls the multi-channel battery isolation switching circuit to connect to the corresponding one or more batteries according to the battery selection information. The battery selection information is the battery in the corresponding battery swap bay selected by the main control system according to the battery power information in each battery swap bay.

[0026] The backup power supply circuit in the electric vehicle battery replacement system of the present invention has a circuit block diagram of an embodiment as shown in FIG. Figure 2 , including a communication circuit, a processor circuit, a multi-channel battery isolation switching circuit, a high-voltage support circuit, an electromagnetic isolation and power conversion circuit, a high-frequency generating circuit, a high-frequency rectifying and filtering circuit, a low-voltage support circuit and a voltage input and output adaptive circuit. The communication circuit is connected to the processor circuit, the processor circuit is connected to the multi-channel battery isolation switching circuit, the multi-channel battery isolation switching circuit is connected to the high-voltage support circuit, the high-voltage support circuit is connected to the electromagnetic isolation and power conversion circuit, the high-frequency generating circuit is connected to the electromagnetic isolation and power conversion circuit, the electromagnetic isolation and power conversion circuit is connected to the high-frequency rectifying and filtering circuit, the high-frequency rectifying and filtering circuit is connected to the low-voltage support circuit, and the low-voltage support circuit is connected to the voltage input and output adaptive circuit.

[0027] The backup power supply circuit in the electric vehicle battery replacement system of the present invention has a communication circuit schematic diagram as shown in FIG. Figure 3 , including a TJA1050 transceiver chip U6, a power supply V1, a resistor R22, a resistor R23, a capacitor C20, a capacitor C21, a capacitor C22, a connector J2 and a PSM712 transient suppression diode array, wherein the RXD pin 4 and the TXD pin 1 of the TJA1050 transceiver chip are connected to the processor circuit, the GND pin 2 is grounded, the S pin 8 is grounded, the VCC pin 3 is connected to the power supply, the CANL pin 6 is connected to the pin 9 of the connector J2, the CANL pin 6 of the TJA1050 transceiver chip is also connected to one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R22 is also connected to one end of the capacitor C20, the other end of the capacitor C20 is connected to the pin 9 of the connector J2, the T The CANH pin 7 of the JA1050 transceiver chip is connected to pin 2 of connector 2 J2, the CANH pin 7 of the TJA1050 transceiver chip is also connected to one end of resistor 23 R23, the other end of resistor 23 R23 is grounded, the other end of resistor 23 R23 is also connected to one end of capacitor 22 R22, the other end of capacitor 22 R22 is connected to pin 2 10 of connector 2 J2, the other end of resistor 23 is also connected to pin 3 13 of the PSM712 transient suppression diode array, pin 2 12 of the PSM712 transient suppression diode array is connected to pin 2 10 of connector 2, pin 2 12 of the PSM712 transient suppression diode array is also connected to the CANH pin 7 of the TJA1050 transceiver chip, and pin 1 11 of the PSM712 transient suppression diode array is connected to pin 1 9 of connector 2.

[0028] The backup power supply circuit in the electric vehicle battery replacement system of the present invention has a processor circuit block diagram as shown in FIG. Figure 4, including STM32F103C8T6 single-chip microcomputer, crystal oscillator circuit, ID design circuit, power-on reset circuit, operation indication circuit and connector circuit, the crystal oscillator circuit is connected with STM32F103C8T6 single-chip microcomputer, the ID design circuit is connected with STM32F103C8T6 single-chip microcomputer, the power-on reset circuit is connected with STM32F103C8T6 single-chip microcomputer, the operation indication circuit is connected with STM32F103C8T6 single-chip microcomputer, the connector circuit is connected with STM32F103C8T6 single-chip microcomputer, the crystal oscillator circuit includes capacitor twenty-three, capacitor twenty-four, crystal oscillator one, the ID design circuit includes resistor twenty-seven, resistor twenty-eight, resistor twenty-nine, resistor thirty, DS-04 switch, the power-on reset circuit includes Resistor twenty-six, capacitor twenty-five, the operation indication circuit includes resistor twenty-four, LED2, the connector circuit includes connector three, resistor twenty-five, the VDD_1 pin, VDD_2 pin and VDD_3 pin of the STM32F103C8T6 microcontroller are connected to power supply two, the VSS_1 pin, VSS_2 pin and VSS_3 pin are grounded, the VDDA pin is connected to power supply two, the VSSA pin is grounded to the BOOT0 pin, the PD0 pin is connected to one end of capacitor twenty-three, the other end of capacitor twenty-three is grounded, the other end of capacitor twenty-three is also connected to one end of capacitor twenty-four, the other end of capacitor twenty-four is connected to the PD1 pin of the STM32F103C8T6 microcontroller, the other end of capacitor twenty-four is connected to the One end is also connected to one end of crystal oscillator one, the other end of crystal oscillator one is connected to the PD0 pin of STM32F103C8T6 microcontroller, the VBAT pin of STM32F103C8T6 microcontroller is connected to power supply two, the VBAT pin of STM32F103C8T6 microcontroller is also connected to one end of resistor twenty-six, the other end of resistor twenty-six is ​​connected to one end of capacitor twenty-five, the other end of capacitor twenty-five is grounded, the other end of resistor twenty-six is ​​also connected to the NRST pin of STM32F103C8T6 microcontroller, PA5 pin of STM32F103C8T6 microcontroller is connected to the cathode of light-emitting diode two, the anode of light-emitting diode two is connected to one end of resistor twenty-four, the other end of resistor twenty-four is connected to power supply two The other end of resistor twenty-four is also connected to pin one of connector three, pin two of connector three is grounded, pin two of connector three is also connected to one end of resistor twenty-five, the other end of resistor twenty-five is connected to pin PB2 of STM32F103C8T6 microcontroller, pin three of connector three is connected to pin PA14 of STM32F103C8T6 microcontroller, pin four of connector three is connected to pin PA13 of STM32F103C8T6 microcontroller, pin PA8, pin PA9, pin PB10, pin PB11, pin PB12, pin PB13, pin PB14 and pin PB15 of STM32F103C8T6 microcontroller are connected to multi-channel battery isolation switching circuit,The PB7 pin of the STM32F103C8T6 microcontroller is connected to the DS-04 switch pin five, the PB6 pin of the STM32F103C8T6 microcontroller is connected to the DS-04 switch pin six, the PB5 pin of the STM32F103C8T6 microcontroller is connected to the DS-04 switch pin seven, the PB4 pin of the STM32F103C8T6 microcontroller is connected to the DS-04 switch pin eight, the DS-04 switch pin one, pin two, pin three, and pin four are grounded, the DS-04 switch pin five is also connected to one end of resistor twenty-seven, the other end of resistor twenty-seven is connected to power supply two, the other end of resistor twenty-seven is also connected to one end of resistor twenty-eight, the other end of resistor twenty-eight is connected to DS-04 switch pin six, the other end of resistor twenty-seven is also connected to one end of resistor twenty-nine, the other end of resistor twenty-nine is connected to DS-04 switch pin seven, the other end of resistor twenty-seven is also connected to one end of resistor thirty, and the other end of resistor thirty is connected to DS-04 switch pin eight. ,

[0029] The backup power supply circuit in the electric vehicle battery replacement system of the present invention has a single-channel battery isolation circuit schematic diagram as shown in FIG. Figure 5, including a resistor 32 R32, a resistor 33 R33, a resistor 34 R34, a power supply 3 V3, a light emitting diode 3 LED3, a MOS tube Q3, a fuse F2, a HF115F-012-2HS4 relay, a diode and a connector 4 J4, wherein the anode of the light emitting diode 3 LED3 is connected to the power supply 3 V3, the cathode is connected to one end of the resistor 32 R32, the other end of the resistor 32 R32 is connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is grounded, the source of the MOS tube Q3 is also connected to one end of the resistor 34 R34, the other end of the resistor 34 R34 is connected to the gate of the MOS tube Q3, the gate of the MOS tube Q3 is also connected to one end of the resistor 33 R33, the other end of the resistor 33 R33 is connected to the processor circuit, and the other end of the resistor 32 R32 is also connected to the pin 1a of the HF115F-012-2HS4 relay, Pin 1a of the HF115F-012-2HS4 relay is also connected to the anode of the diode, the cathode of the diode is connected to the power supply 3 V3, pin 6f of the HF115F-012-2HS4 relay is connected to the power supply 3 V3, pin 6f of the HF115F-012-2HS4 relay is also connected to the cathode of the diode, pin 1g of connector 4 J4 is connected to pin 4d of the HF115F-012-2HS4 relay, pin 2h of connector 4 J4 is connected to pin 3c of the HF115F-012-2HS4 relay, pin 5e of the HF115F-012-2HS4 relay is connected to the negative pole B- of the power output terminal, pin 2b of the HF115F-012-2HS4 relay is connected to one end of the fuse F2, the other end of the fuse F2 is connected to the positive pole B+ of the power output terminal, and the battery in the battery swap compartment is connected to the circuit through connector J4.

[0030] The backup power supply circuit in the electric vehicle battery replacement system also includes a high-voltage support circuit, which is connected to the multi-channel battery isolation switching circuit. The high-voltage support circuit includes at least two capacitors. The multiple capacitors are connected in parallel, which can solve the problem of temporary power shortage when the relay is working.

[0031] The backup power supply circuit in the electric vehicle battery replacement system also includes an electromagnetic isolation and power conversion circuit, which is connected to the high-voltage support circuit. The electromagnetic isolation and power conversion circuit includes a flyback isolation transformer wound with an ER2834 magnetic core and a MOS tube. The MOS tube is connected to the flyback isolation transformer, which can increase the anti-interference ability and improve the safety of the circuit.

[0032] The backup power supply circuit in the electric vehicle battery replacement system also includes a high-frequency generating circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency generating circuit includes an NCP1271 flyback switch control chip, which is connected to the electromagnetic isolation and power conversion circuit. While obtaining a high-frequency signal, it can improve the quality of the high-frequency signal.

[0033] The backup power supply circuit in the electric vehicle battery replacement system also includes a high-frequency rectification and filtering circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency rectification and filtering circuit includes at least two TO220 packaged dual diodes and two capacitors. The TO220 packaged dual diodes are connected to the capacitors, which can improve heat dissipation and increase output current capacity.

[0034] The backup power supply circuit in the electric vehicle battery replacement system also includes a low-voltage support circuit, which is connected to the high-frequency rectification and filtering circuit. The low-voltage support circuit includes at least two capacitors. The multiple capacitors are connected in parallel to avoid fluctuations caused by power failure.

[0035] The backup power supply circuit in the electric vehicle battery replacement system also includes a voltage input and output adaptive circuit, which includes at least two diodes. The cathodes of the multiple diodes are connected in parallel to facilitate switching between the backup power supply and the main power supply.

[0036] The software method related to the present invention is that the battery swap system obtains the voltage information of each battery in real time and sends it to the external main control system. The main control system selects one or more batteries according to the voltage information, and sends the corresponding battery selection information to the processor circuit. The processor circuit receives the battery selection information sent by the external main control system through the communication circuit, and controls the multi-channel battery isolation switching circuit to connect to the corresponding one or more batteries according to the battery selection information. If the battery in the battery swap compartment is replaced, the processor circuit controls the multi-channel battery isolation switching circuit to switch to the corresponding one or more batteries according to the battery selection information received in real time. The batteries in the battery swap compartment are connected in real time, so when the AC power is disconnected, the connected batteries will immediately power the battery swap system, and the battery swap system continues to work normally.

[0037] The present invention no longer requires additional batteries, and through the combination of hardware circuits and software methods, can achieve multi-channel power input, switching between channels, safe isolation of each channel, and seamless switching between backup power and main power.

Claims

1. The backup power supply circuit in the electric vehicle battery replacement system is characterized by: It includes a communication circuit, a processor circuit and a multi-channel battery isolation switching circuit, wherein the multi-channel battery isolation switching circuit includes a power output terminal and at least one power input terminal, the communication circuit is connected to the processor circuit, the processor circuit is connected to the multi-channel battery isolation switching circuit, the power output terminal of the multi-channel battery isolation switching circuit is used to be connected to the power supply input terminal of the battery swap system, the power input terminal of the multi-channel battery isolation switching circuit is used to be connected one-to-one with the batteries in the battery swap compartment of the battery swap system, and the multi-channel battery isolation switching circuit can switch the power input terminal connected to the power output terminal; The processor circuit receives the battery selection information sent in real time from the external main control system through the communication circuit. When the battery in the battery swap compartment is replaced, the processor circuit controls the multi-channel battery isolation switching circuit to switch to the corresponding one or more batteries according to the battery selection information received in real time. When the mains power is disconnected, the connected battery supplies power to the battery swap system, and the battery swap system continues to work normally. The multi-channel battery isolation switching circuit includes at least two single-channel battery isolation circuits, the positive poles of the power output ends of the multiple single-channel battery isolation circuits are connected, the negative poles of the power output ends of the multiple single-channel battery isolation circuits are connected, the positive pole of the power output end is connected to the positive pole of the power supply input end of the battery replacement system, and the negative pole of the power output end is connected to the negative pole of the power supply input end of the battery replacement system. The single-channel battery isolation circuit includes resistor thirty-two, resistor thirty-three, resistor thirty-four, power supply three, light-emitting diode three, MOS tube, fuse, HF115F-012-2HS4 relay, diode and connector four, the anode of light-emitting diode three is connected to power supply three, the cathode is connected to one end of resistor thirty-two, the other end of resistor thirty-two is connected to the drain of the MOS tube, the source of the MOS tube is grounded, the source of the MOS tube is also connected to one end of resistor thirty-four, the other end of resistor thirty-four is connected to the gate of the MOS tube, the gate of the MOS tube is also connected to one end of resistor thirty-three, and the resistor thirty-three is connected to the gate of the MOS tube. The other end is connected to the processor circuit, the other end of resistor thirty-two is also connected to pin one of the HF115F-012-2HS4 relay, pin one of the HF115F-012-2HS4 relay is also connected to the anode of the diode, the cathode of the diode is connected to power supply three, pin six of the HF115F-012-2HS4 relay is connected to power supply three, pin six of the HF115F-012-2HS4 relay is also connected to the cathode of the diode, pin one of connector four is connected to pin four of the HF115F-012-2HS4 relay, pin two of connector four is connected to pin three of the HF115F-012-2HS4 relay, pin five of the HF115F-012-2HS4 relay is connected to the negative pole of the power output terminal, pin two of the HF115F-012-2HS4 relay is connected to one end of the fuse, the other end of the fuse is connected to the positive pole of the power output terminal, and the battery in the battery swapping compartment of the battery swapping system is connected to the circuit through the J4 connector.

2. The backup power supply circuit in the electric vehicle battery replacement system according to claim 1, characterized in that: The communication circuit includes a TJA1050 transceiver chip, a power supply 1, a resistor 22, a resistor 23, a capacitor 20, a capacitor 21, a capacitor 22, a connector 2 and a PSM712 transient suppression diode array. The RXD pin and the TXD pin of the TJA1050 transceiver chip are connected to the processor circuit, the GND pin is grounded, the S pin is grounded, the VCC pin is connected to the power supply 1, the CANL pin is connected to the pin 1 of the connector 2, the CANL pin of the TJA1050 transceiver chip is also connected to one end of the resistor 22, the other end of the resistor 22 is grounded, the other end of the resistor 22 is also connected to one end of the capacitor 20, the other end of the capacitor 20 is connected to the pin 1 of the connector 2, and the TJA105 The CANH pin of the 0 transceiver chip is connected to pin 2 of connector 2, the CANH pin of the TJA1050 transceiver chip is also connected to one end of resistor 23, the other end of resistor 23 is grounded, the other end of resistor 23 is also connected to one end of capacitor 22, the other end of capacitor 22 is connected to pin 2 of connector 2, the other end of resistor 23 is also connected to pin 3 of the PSM712 transient suppression diode array, pin 2 of the PSM712 transient suppression diode array is connected to pin 2 of connector 2, pin 2 of the PSM712 transient suppression diode array is also connected to the CANH pin of the TJA1050 transceiver chip, and pin 1 of the PSM712 transient suppression diode array is connected to pin 1 of connector 2.

3. The backup power supply circuit in the electric vehicle battery replacement system according to claim 1, characterized in that: The processor circuit comprises an STM32F103C8T6 single-chip microcomputer, a crystal oscillator circuit, an ID design circuit, a power-on reset circuit, an operation indication circuit and a connector circuit, wherein the crystal oscillator circuit is connected to the STM32F103C8T6 single-chip microcomputer, the ID design circuit is connected to the STM32F103C8T6 single-chip microcomputer, the power-on reset circuit is connected to the STM32F103C8T6 single-chip microcomputer, the operation indication circuit is connected to the STM32F103C8T6 single-chip microcomputer, and the connector circuit is connected to the STM32F103C8T6 single-chip microcomputer.

4. The backup power supply circuit in the electric vehicle battery replacement system according to any one of claims 1 to 3, characterized in that: It also includes a high-voltage support circuit, which is connected to the multi-channel battery isolation switching circuit. The high-voltage support circuit includes at least two capacitors, and the multiple capacitors are connected in parallel.

5. The backup power supply circuit in the electric vehicle battery replacement system according to claim 4, characterized in that: It also includes an electromagnetic isolation and power conversion circuit, which is connected to the high-voltage support circuit. The electromagnetic isolation and power conversion circuit includes a flyback isolation transformer wound with an ER2834 magnetic core and a MOS tube, and the MOS tube is connected to the flyback isolation transformer.

6. The backup power supply circuit in the electric vehicle battery replacement system according to claim 5, characterized in that: It also includes a high-frequency generating circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency generating circuit includes an NCP1271 flyback switch control chip, which is connected to the electromagnetic isolation and power conversion circuit.

7. The backup power supply circuit in the electric vehicle battery replacement system according to claim 6, characterized in that: It also includes a high-frequency rectification and filtering circuit, which is connected to the electromagnetic isolation and power conversion circuit. The high-frequency rectification and filtering circuit includes at least two TO220 packaged dual diodes and two capacitors, and the TO220 packaged dual diodes are connected to the capacitors.

8. The backup power supply circuit in the electric vehicle battery replacement system according to claim 7, characterized in that: It also includes a low-voltage support circuit, which is connected to the high-frequency rectification and filtering circuit. The low-voltage support circuit includes at least two capacitors, and the multiple capacitors are connected in parallel.

9. The backup power supply circuit in the electric vehicle battery replacement system according to claim 8, characterized in that: It also includes a voltage input-output adaptive circuit, which includes at least two diodes, and the cathodes of the multiple diodes are connected in parallel.

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