Battery management system with fire control

Abstract

The utility model discloses a battery management system with fire control, which comprises a battery cluster management module, a high-voltage box, a main electric valve, a plurality of secondary electric valves and a plurality of battery box management modules, and the secondary electric valves and the battery box management modules are in one-to-one correspondence with battery boxes; the battery boxes are sequentially connected in series to form a battery cluster and then connected to the high-voltage box; the battery box management module receives a sensing signal of a battery box and sends the sensing signal to the battery cluster management module; an input port of the main electric valve is connected with a fire extinguishing agent outlet of the fire-fighting device, an output port is connected with input ports of the secondary electric valves, and the battery cluster management module is connected with a control end of the main electric valve through a DO signal; the output port of the secondary electric valve is connected with the fire extinguishing agent jet orifice in the corresponding battery box, and the battery box management module is connected with the control end of the corresponding secondary electric valve through a DO signal; and the battery cluster management module is also connected with the high-voltage box through a DI / DO signal. The system can quickly respond to fire detection signals and is high in fire extinguishing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery energy storage technology, and in particular to a battery management system with fire control. Background Technology

[0002] Currently, battery energy storage systems typically employ a separate management model for battery information management, battery fire detection, and fire suppression inhibitors. Each subsystem usually has its own host for control. While this model offers advantages such as high efficiency in battery cluster classification and hierarchical management, ease of expansion, and convenient maintenance, it also presents safety hazards such as delayed, ineffective, or malfunctioning fire emergency response due to untimely collection of battery fire information or communication failures. Summary of the Invention

[0003] This invention aims to solve the technical problems of existing technologies that may lead to slow response and failure, and provides a battery management system with fire control that features rapid fire detection response, high fire extinguishing efficiency, and good safety.

[0004] This utility model addresses the aforementioned technical problems primarily through the following technical solution: a battery management system with fire control, comprising a battery cluster management module, a high-voltage box, a main electric valve, several secondary electric valves, and several battery box management modules. Each secondary electric valve corresponds one-to-one with a battery box management module. Each battery box management module is connected to a corresponding battery box, meaning each secondary electric valve also corresponds one-to-one with a battery box. The battery boxes are sequentially connected in series to form a battery cluster, which is then connected to the high-voltage box. The battery box management module receives sensor signals from the corresponding battery box and transmits them to the battery cluster management module via a CAN bus. The input port of the main electric valve is connected to the extinguishing agent outlet of the fire-fighting device via a pipe, and the output port of the main electric valve is connected to the input ports of each secondary electric valve via a pipe. The battery cluster management module is connected to the control terminal of the main electric valve via a DO signal. The output ports of the secondary electric valves are connected to the extinguishing agent injection ports within the corresponding battery boxes, and the battery box management module is connected to the control terminal of the corresponding secondary electric valve via a DO signal. The battery cluster management module is also connected to the high-voltage box via a DI / DO signal.

[0005] The battery cluster management module receives various information from the battery box management module. When a fire alarm is reported by the battery box management module, it sends an opening command to the main electric valve (default normally closed) via the DO signal, and simultaneously outputs a disconnect command to the high-voltage box via the DI / DO signal. The battery box management module collects temperature information, fire detection signals, and other signals from the battery box. When both abnormal battery temperature information and fire signals from the fire detector are received simultaneously, it outputs an opening command to the corresponding secondary electric valve (default normally closed) via the DO signal, and uploads the fire alarm to the battery cluster management module via the CAN bus. The fire-fighting device is a device that stores fire extinguishing agent internally and can spray the fire extinguishing agent, which is perfluorohexanone or heptafluoropropane. The battery box is mainly composed of individual batteries connected in series, and is equipped with fire detectors (such as gas sensors for detecting hydrogen) and temperature sensors, which can detect the fire signals and temperature of individual batteries in real time. The battery boxes are connected in series to form battery clusters, which are then connected to the high-voltage box. The high-voltage box mainly consists of circuit breakers, copper busbars, and DC contactors connected in series to form a power circuit, which can be manually or electrically controlled to open and close the circuit. DI and DO signals use only two states (0 / 1) to represent information. The channels are independent, directly reflecting the physical device status. The status is singular, requiring no complex encoding or analog-to-digital conversion. Processing speed is fast, with judgment taking only milliseconds. They can also directly drive relays and other switching devices without intermediate steps such as signal conversion or communication protocol parsing. Furthermore, they are easily expandable and troubleshootable. Signal transceiver modules commonly employ optocoupler isolation or relay isolation, separating the control system from the field device circuitry to avoid electromagnetic interference causing signal misinterpretation and ensure reliable signal transmission. Therefore, the entire system possesses extremely high response speed and anti-interference capability.

[0006] Preferably, the battery cluster management module includes a main control circuit, a main CAN communication circuit, and a main DI / DO circuit. The main control circuit includes a main control chip, which is an MC9S08DZ60. The main control chip is connected to the main CAN communication circuit and the main DI / DO circuit. The main CAN communication circuit includes a CAN chip U9. Pins 2 and 3 of the CAN chip U9 are connected to pins 46 and 45 of the main control chip, respectively. Pins 6 and 7 of the CAN chip U9 are connected to pins 2 and 1 of the common-mode inductor, respectively. Pins 3 and 4 of the common-mode inductor are connected to the CAN bus as communication ports. A resistor R122 and a bus protection network are also connected between pins 3 and 4 of the common-mode inductor. The bus protection network includes two sets of devices connected in series. Each set includes a TVS diode, a capacitor, and a bidirectional Zener diode connected in parallel. The first end of the first set of devices is connected to pin 3 of the common-mode inductor, and the first end of the second set of devices is connected to pin 4 of the common-mode inductor. The second ends of both sets of devices are grounded.

[0007] The battery cluster management module connects to each battery box management module via the main CAN communication circuit to obtain information uploaded by the battery box management modules. A bus protection network protects the CAN chip, resisting high-energy transient pulses, filtering out high-frequency noise, and suppressing interference.

[0008] Preferably, the main DI / DO circuit includes a DI unit and two DO units. The DI unit includes an optocoupler O1. The positive terminal of the input of the optocoupler O1 is connected to a 24V power supply through a diode D6. The negative terminal of the input of the optocoupler O1 is connected to the first terminal of a resistor R1. The second terminal of the resistor R1 receives the DI signal from the high-voltage box. The negative terminal of the output of the optocoupler O1 is grounded, and the positive terminal of the output of the optocoupler O1 is connected to pin 66 of the main control chip.

[0009] The first DO unit includes an optocoupler O8. The positive input terminal of optocoupler O8 is connected to a 3.3V power supply, and the negative input terminal of optocoupler O8 is connected to the first terminal of resistor R85. The second terminal of resistor R85 is connected to pin 63 of the main control chip. The positive output terminal of optocoupler O8 is connected to a 24V power supply, and the negative output terminal of optocoupler O8 is connected to the gate of MOSFET Q13 through resistor R89. The source of MOSFET Q13 is grounded, and the drain of MOSFET Q13 serves as the driving terminal to output the DO signal. The drain of MOSFET Q13 is also connected to the anode of diode D18, and the cathode of diode D18 is connected to a 24V power supply. The second DO unit has the same structure as the first DO unit. The driving terminals of the two DO units are connected to the high-voltage box and the main electric valve, respectively.

[0010] The DI unit receives hard-wired signals from the high-voltage box, such as switch status signals within the high-voltage box. The DO unit controls the opening and closing of the main electric valve and the DC contactor within the high-voltage box.

[0011] Preferably, the battery box management module includes an MCU circuit, a second CAN communication circuit, a second DO circuit, a gas detection circuit, and a temperature detection circuit; the MCU circuit includes an MCU chip, which is an MC9S08DZ60, and the MCU chip is connected to the second CAN communication circuit, the second DO circuit, the gas detection circuit, and the temperature detection circuit.

[0012] The battery box management module obtains fire hazard information of individual batteries in the battery box, uploads fire alarms, and controls the opening and closing of secondary electric valves.

[0013] Preferably, the second CAN communication circuit includes a CAN chip U144, pins 1 and 4 of the CAN chip U144 are connected to pins 53 and 52 of the MCU chip, respectively; pins 6 and 7 of the CAN chip U144 are connected to pins 1 and 2 of the common mode inductor L144, respectively; and pins 3 and 4 of the common mode inductor L144 are connected to the CAN bus as communication ports.

[0014] Preferably, the second DO circuit includes a transistor Q16 and a relay K16. The base of transistor Q16 is connected to pin 59 of the MCU chip through a resistor R16. The emitter of transistor Q16 is connected to a 5V power supply. The collector of transistor Q16 is connected to the first terminal of the coil of relay K16. The second terminal of the coil of relay K16 is grounded. The moving contact and stationary contact of relay K16 are connected to the control terminal of the secondary electric valve.

[0015] Preferably, the gas detection circuit includes a hydrogen gas sensor SE1 (i.e., a fire detector). Pins 1A and 2A of the gas sensor SE1 are connected to the positive terminal of the light-emitting diode Led2 through a resistor R40. The negative terminal of the light-emitting diode Led2 is grounded. Pins 1B and 2B of the gas sensor SE1 are connected to pin 99 of the MCU chip through a fuse F1 and a resistor R44 connected in series.

[0016] Preferably, the temperature detection circuit includes temperature detection chip U33 and temperature detection chip U34. Pin 3 of temperature detection chip U33 is connected to pin 19 of AFE chip, and pin 3 of temperature detection chip U34 is connected to pin 20 of AFE chip. The I / O pins of the two temperature detection chips are connected to several thermistors located in the battery box. The AFE chip is connected to the MCU chip through pins 31 and 32.

[0017] When a single battery cell experiences thermal runaway and fire, producing hydrogen gas, the hydrogen gas diffuses through the air inlet to the vicinity of the gas sensor in the battery pack management module. The gas sensor detects the hydrogen gas production and immediately generates an electrical signal to the controller of the battery pack management module. The controller outputs a control signal to open the corresponding secondary electric valve (such as Q1) and simultaneously uploads a fire alarm to the battery cluster management module via the second CAN communication circuit. Upon receiving the fire alarm, the battery cluster management module immediately controls the high-voltage box to disconnect the power circuit via the DI / DO interface and simultaneously controls the main electric valve Q0 to open, rapidly spraying extinguishing agent to extinguish the fire until the fire alarm signal is cleared.

[0018] The beneficial effects of this invention are that it improves the timeliness of battery fire response, reduces the probability of fire protection system failure, and enhances the effectiveness of fire suppression. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a battery management system with fire control according to this utility model;

[0020] Figure 2 This is a schematic diagram of the main control circuit of a battery cluster management module according to this utility model;

[0021] Figure 3 This is a schematic diagram of the main CAN communication circuit of a battery cluster management module according to this utility model;

[0022] Figure 4 This is a schematic diagram of the DI unit of the main DI / DO circuit of a battery cluster management module according to this utility model;

[0023] Figure 5 This is a schematic diagram of the first DO unit of the main DI / DO circuit of a battery cluster management module according to this utility model;

[0024] Figure 6 This is a schematic diagram of the MCU circuit of a battery box management module according to this utility model;

[0025] Figure 7 This is a schematic diagram of the second CAN communication circuit of a battery box management module according to this utility model;

[0026] Figure 8 This is a schematic diagram of the second DO circuit of a battery box management module according to this utility model;

[0027] Figure 9 This is a schematic diagram of the gas detection circuit of a battery box management module according to this utility model;

[0028] Figure 10 This is a schematic diagram of the temperature detection circuit of a battery box management module according to this utility model;

[0029] In the diagram: 1. Battery cluster management module; 2. Battery box management module; 3. High voltage box; 4. Battery box; 5. Fire-fighting device; Q0. Main electric valve; Q1. Secondary electric valve. Detailed Implementation

[0030] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0031] Example: This example describes a battery management system with fire control, such as... Figure 1As shown, the system includes a battery cluster management module 1, a high-voltage box 3, a main electric valve Q0, several secondary electric valves Q1, and several battery box management modules 2. Each secondary electric valve corresponds one-to-one with a battery box management module. Each battery box management module is connected to a corresponding battery box 4, meaning each secondary electric valve also corresponds one-to-one with a battery box. The battery boxes are connected in series to form a battery cluster, which is then connected to the high-voltage box. The battery box management module receives sensor signals from the corresponding battery box and sends them to the battery cluster management module via a CAN bus. The input port of the main electric valve is connected to the extinguishing agent outlet of the fire-fighting device 5 via a pipe, and the output port of the main electric valve is connected to the input port of each secondary electric valve via a pipe. The battery cluster management module is connected to the control terminal of the main electric valve via a DO signal. The output ports of the secondary electric valves are connected to the extinguishing agent spray ports within the corresponding battery boxes, and the battery box management module is connected to the control terminal of the corresponding secondary electric valve via a DO signal. The battery cluster management module is also connected to the high-voltage box via DI / DO signals.

[0032] The battery cluster management module receives various information from the battery box management module. When a fire alarm is reported by the battery box management module, it sends an opening command to the main electric valve (default normally closed) via the DO signal, and simultaneously outputs a disconnect command to the high-voltage box via the DI / DO signal. The battery box management module collects temperature information, fire detection signals, and other signals from the battery box. When both abnormal battery temperature information and a fire signal from the fire detector are received simultaneously, it outputs an opening command to the corresponding secondary electric valve (default normally closed) via the DO signal, and uploads the fire alarm to the battery cluster management module via the CAN bus. The fire-fighting device is a device that stores extinguishing agent and can spray the extinguishing agent, which is perfluorohexanone or heptafluoropropane. The battery box is mainly composed of individual batteries connected in series, and has built-in fire detectors (i.e., gas sensors) and temperature sensors, which can detect the fire signals and temperatures of individual batteries in real time. The battery boxes are connected in series to form battery clusters, which are then connected to the high-voltage box. The high-voltage box mainly consists of circuit breakers, copper busbars, and DC contactors connected in series to form a power circuit, which can be manually or electrically controlled to open and close the circuit. DI and DO signals use only two states (0 / 1) to represent information. The channels are independent, directly reflecting the physical device status. The status is singular, requiring no complex encoding or analog-to-digital conversion. Processing speed is fast, with judgment taking only milliseconds. They can also directly drive relays and other switching devices without intermediate steps such as signal conversion or communication protocol parsing. Furthermore, they are easily expandable and troubleshootable. Signal transceiver modules commonly employ optocoupler isolation or relay isolation, separating the control system from the field device circuitry to avoid electromagnetic interference causing signal misinterpretation and ensure reliable signal transmission. Therefore, the entire system possesses extremely high response speed and anti-interference capability.

[0033] The battery cluster management module includes a main control circuit, a main CAN communication circuit, and a main DI / DO circuit. For example... Figure 2As shown, the main control circuit includes a main control chip, which is an MC9S08DZ60. The main control chip is connected to the main CAN communication circuit and the main DI / DO circuit; Figure 3 As shown, the main CAN communication circuit includes a CAN chip U9. Pins 2 and 3 of the CAN chip U9 are connected to pins 46 and 45 of the main control chip, respectively. Pins 6 and 7 of the CAN chip U9 are connected to pins 2 and 1 of the common-mode inductor, respectively. Pins 3 and 4 of the common-mode inductor are connected to the CAN bus as communication ports. A resistor R122 and a bus protection network are also connected across pins 3 and 4 of the common-mode inductor. The bus protection network includes two sets of devices connected in series. Each set includes a TVS diode, a capacitor, and a bidirectional Zener diode connected in parallel. The first end of the first set of devices is connected to pin 3 of the common-mode inductor, and the first end of the second set of devices is connected to pin 4 of the common-mode inductor. The second ends of both sets of devices are grounded.

[0034] The battery cluster management module connects to each battery box management module via the main CAN communication circuit to obtain information uploaded by the battery box management modules. A bus protection network protects the CAN chip, resisting high-energy transient pulses, filtering out high-frequency noise, and suppressing interference.

[0035] The main DI / DO circuit includes a DI unit and two DO units. For example... Figure 4 As shown, the DI unit includes an optocoupler O1. The positive terminal of the input of the optocoupler O1 is connected to a 24V power supply through a diode D6. The negative terminal of the input of the optocoupler O1 is connected to the first terminal of a resistor R1. The second terminal of the resistor R1 receives the DI signal from the high-voltage box. The negative terminal of the output of the optocoupler O1 is grounded, and the positive terminal of the output of the optocoupler O1 is connected to pin 66 of the main control chip.

[0036] like Figure 5 As shown, the first DO unit includes an optocoupler O8. The positive input terminal of optocoupler O8 is connected to a 3.3V power supply, and the negative input terminal is connected to the first terminal of resistor R85. The second terminal of resistor R85 is connected to pin 63 of the main control chip. The positive output terminal of optocoupler O8 is connected to a 24V power supply, and the negative output terminal is connected to the gate of MOSFET Q13 through resistor R89. The source of MOSFET Q13 is grounded, and the drain of MOSFET Q13 serves as the driving terminal, outputting the DO signal. The drain of MOSFET Q13 is also connected to the anode of diode D18, and the cathode of diode D18 is connected to the 24V power supply. The second DO unit has the same structure as the first DO unit. The driving terminals of the two DO units are connected to the high-voltage box and the main electric valve, respectively.

[0037] The DI unit receives hard-wired signals from the high-voltage box, such as switch status signals within the high-voltage box. The DO unit controls the opening and closing of the main electric valve and the DC contactor within the high-voltage box.

[0038] The battery box management module includes an MCU circuit, a second CAN communication circuit, a second DO circuit, a gas detection circuit, and a temperature detection circuit; such as Figure 6 As shown, the MCU circuit includes an MCU chip, which is an MC9S08DZ60. The MCU chip is connected to the second CAN communication circuit, the second DO circuit, the gas detection circuit, and the temperature detection circuit.

[0039] The battery box management module obtains fire hazard information of individual batteries in the battery box, uploads fire alarms, and controls the opening and closing of secondary electric valves.

[0040] like Figure 7 As shown, the second CAN communication circuit includes a CAN chip U144. Pins 1 and 4 of the CAN chip U144 are connected to pins 53 and 52 of the MCU chip, respectively. Pins 6 and 7 of the CAN chip U144 are connected to pins 1 and 2 of the common-mode inductor L144, respectively. Pins 3 and 4 of the common-mode inductor L144 are used as communication ports to connect to the CAN bus.

[0041] like Figure 8 As shown, the second DO circuit includes a transistor Q16 and a relay K16. The base of transistor Q16 is connected to pin 59 of the MCU chip through resistor R16. The emitter of transistor Q16 is connected to a 5V power supply. The collector of transistor Q16 is connected to the first terminal of the coil of relay K16. The second terminal of the coil of relay K16 is grounded. The moving and stationary contacts of relay K16 are connected to the control terminals of the secondary electric valve, i.e., DO1- and DO1+ are directly connected to the electric valve, which is a control switch.

[0042] like Figure 9 As shown, the gas detection circuit includes a hydrogen gas sensor SE1. Pins 1A and 2A of the gas sensor SE1 are connected to the positive terminal of the light-emitting diode Led2 through a resistor R40. The negative terminal of the light-emitting diode Led2 is grounded. Pins 1B and 2B of the gas sensor SE1 are connected to pin 99 of the MCU chip through a fuse F1 and a resistor R44 connected in series.

[0043] like Figure 10 As shown, the temperature detection circuit includes temperature detection chip U33 and temperature detection chip U34. Pin 3 of temperature detection chip U33 is connected to pin 19 of AFE chip, and pin 3 of temperature detection chip U34 is connected to pin 20 of AFE chip. The I / O pins of the two temperature detection chips are connected to several thermistors set in the battery box. AFE chip is connected to MCU chip through pins 31 and 32.

[0044] When a single battery cell experiences thermal runaway and fire, producing hydrogen gas, the hydrogen gas diffuses through the air inlet to the vicinity of the gas sensor in the battery pack management module. The gas sensor detects the hydrogen gas production and immediately generates an electrical signal to the controller of the battery pack management module. The controller outputs a control signal to open the corresponding secondary electric valve (Q1) and simultaneously uploads a fire alarm to the battery cluster management module via the second CAN communication circuit. Upon receiving the fire alarm, the battery cluster management module immediately controls the high-voltage box to disconnect the power circuit via the DI / DO interface and simultaneously controls the main electric valve Q0 to open, rapidly spraying extinguishing agent to extinguish the fire until the fire alarm signal is cleared.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the principles of this invention or exceeding the scope defined by the appended claims.

[0046] Although this document uses terms such as battery cluster management module, battery box management module, and main electric valve frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A battery management system with fire control, characterized by, The battery cluster management module, the high-pressure box, the total electric valve, a plurality of secondary electric valves and a plurality of battery box management modules are included, the secondary electric valves correspond to the battery box management modules one by one, each battery box management module is connected with a battery box, the battery boxes are sequentially connected in series to form a battery cluster and then connected to the high-pressure box, the battery box management module receives the sensing signal of the corresponding battery box and sends it to the battery cluster management module through the CAN bus, the input port of the total electric valve is connected to the fire extinguishing agent outlet of the fire extinguishing device through a pipeline, the output port of the total electric valve is connected to the input port of each secondary electric valve through a pipeline, the battery cluster management module is connected to the control end of the total electric valve through a DO signal, the output port of the secondary electric valve is connected to the fire extinguishing agent injection port in the corresponding battery box, and the battery box management module is connected to the control end of the corresponding secondary electric valve through a DO signal; the battery cluster management module is also connected to the high-pressure box through a DI / DO signal.

2. The battery management system with fire control according to claim 1, characterized in that, The battery cluster management module includes a main control circuit, a main CAN communication circuit and a main DI / DO circuit; the main control circuit includes a main control chip, the main control chip is MC9S08DZ60, and the main control chip is connected with the main CAN communication circuit and the main DI / DO circuit; the main CAN communication circuit includes a CAN chip U9, the 2th pin and the 3th pin of the CAN chip U9 are connected with the 46th pin and the 45th pin of the main control chip respectively, the 6th pin and the 7th pin of the CAN chip U9 are connected with the 2th pin and the 1th pin of a common mode inductor respectively, the 3th pin and the 4th pin of the common mode inductor are connected to a CAN bus as a communication port; a resistor R122 and a bus protection network are further connected between the 3th pin and the 4th pin of the common mode inductor, the bus protection network includes two groups of series-connected devices, each group includes a TVS diode, a capacitor and a bidirectional voltage stabilizing diode connected in parallel, the first end of the first group of devices is connected to the 3th pin of the common mode inductor, the first end of the second group of devices is connected to the 4th pin of the common mode inductor, and the second ends of the two groups of devices are grounded.

3. The battery management system with fire control according to claim 2, characterized in that, The main DI / DO circuit includes a DI unit and two DO units, the DI unit includes an optical coupler O1, the positive input end of the optical coupler O1 is connected to a power supply 24V through a diode D6, the negative input end of the optical coupler O1 is connected to the first end of a resistor R1, the second end of the resistor R1 receives a DI signal of the high-pressure box, the negative output end of the optical coupler O1 is grounded, and the positive output end of the optical coupler O1 is connected to the 66th pin of the main control chip; the first DO unit includes an optical coupler O8, the positive input end of the optical coupler O8 is connected to a power supply 3.3V, the negative input end of the optical coupler O8 is connected to the first end of a resistor R85, the second end of the resistor R85 is connected to the 63th pin of the main control chip, the positive output end of the optical coupler O8 is connected to a power supply 24V, the negative output end of the optical coupler O8 is connected to the gate of a MOS tube Q13 through a resistor R89, the source of the MOS tube Q13 is grounded, the drain of the MOS tube Q13 outputs a DO signal as a driving end, the drain of the MOS tube Q13 is also connected to the positive electrode of a diode D18, and the negative electrode of the diode D18 is connected to a power supply 24V; the second DO unit has the same structure as the first DO unit, and the driving ends of the two DO units are connected to the high-pressure box and the total electric valve respectively.

4. The battery management system with fire control according to claim 1, wherein, The battery box management module comprises an MCU circuit, a second CAN communication circuit, a second DO circuit, a gas detection circuit and a temperature detection circuit; the MCU circuit comprises an MCU chip, the MCU chip is MC9S08DZ60, and the MCU chip is connected with the second CAN communication circuit, the second DO circuit, the gas detection circuit and the temperature detection circuit.

5. The battery management system with fire control according to claim 4, characterized in that, The second CAN communication circuit comprises a CAN chip U144, a pin 1 and a pin 4 of the CAN chip U144 are connected with a pin 53 and a pin 52 of the MCU chip respectively, a pin 6 and a pin 7 of the CAN chip U144 are connected with a pin 1 and a pin 2 of a common mode inductor L144 respectively, and a pin 3 and a pin 4 of the common mode inductor L144 are connected with a CAN bus as a communication port.

6. The battery management system with fire control according to claim 4 or 5, characterized in that, The second DO circuit comprises a triode Q16 and a relay K16, a base of the triode Q16 is connected with a pin 59 of the MCU chip through a resistor R16, an emitter of the triode Q16 is connected with a power supply 5V, a collector of the triode Q16 is connected with a coil first end of the relay K16, a coil second end of the relay K16 is grounded, and a moving contact and a static contact of the relay K16 are connected with a control end of a secondary electric valve.

7. The battery management system with fire control according to claim 4 or 5, characterized in that, The gas detection circuit comprises a gas sensor SE1, a pin 1A and a pin 2A of the gas sensor SE1 are connected with a positive electrode of a light emitting diode Led2 through a resistor R40, a negative electrode of the light emitting diode Led2 is grounded, a pin 1B and a pin 2B of the gas sensor SE1 are connected with a pin 99 of the MCU chip through a fuse F1 and a resistor R44 which are connected in series.

8. The battery management system with fire control according to claim 4, characterized in that, The temperature detection circuit comprises a temperature detection chip U33 and a temperature detection chip U34, a pin 3 of the temperature detection chip U33 is connected with a pin 19 of an AFE chip, a pin 3 of the temperature detection chip U34 is connected with a pin 20 of the AFE chip, and I / O pins of the two temperature detection chips are connected with a plurality of thermistors arranged in the battery box. The AFE chip is connected with the MCU chip through a pin 31 and a pin 32.

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