New energy vehicle power battery thermal runaway monitoring and identifying device

Abstract

The utility model discloses a new energy vehicle power battery thermal runaway monitoring and identifying device which comprises an MEMS gas sensor module circuit which is composed of a plurality of MEMS gas sensors and used for detecting voltage response signals of power battery gas; the thermal modulation module circuit is connected with the MEMS gas sensor module circuit and is used for adjusting the input voltage of a heating layer in the MEMS gas sensor for thermal modulation; the WIFI main control module circuit is respectively connected with the MEMS gas sensor module circuit and the thermal modulation module circuit and is used for converting a voltage response signal detected by the MEMS gas sensor into a digital signal and controlling the thermal modulation module circuit to work; and the intelligent equipment is wirelessly connected with the WIFI main control module circuit and is used for sending an acquisition instruction to the WIFI main control module circuit, receiving voltage response digital signal data and displaying an analysis result after processing the data, so that the problems that the gas monitoring sensor is slow in response, the system is immature and the interaction is inconvenient are solved.

Description

[Technical Field]

[0001] This utility model relates to the field of monitoring thermal runaway gas in power batteries, and in particular to a monitoring and identification device for thermal runaway in power batteries of new energy vehicles. [Background Technology]

[0002] The increasing intelligence of new energy vehicles and growing health awareness mean that monitoring the runaway of power batteries in these vehicles is becoming an essential requirement. Runaway lithium-ion power batteries can produce large amounts of toxic and flammable gases; therefore, gas monitoring solutions (CO, VOCs, H2) are crucial for detecting such runaway.

[0003] The electronic nose industry is rapidly developing for gas monitoring. In the 1980s, Dodd and Persaud et al. from the University of Warwick in the UK developed a novel technology (electronic nose) that mimics the olfactory system of animals. Currently, the response time of electronic noses for gas monitoring is generally between a few seconds and a few minutes, and several minutes are required for them to reach a stable state before each monitoring session. Electronic nose systems often require more than 10 different gas response sensors for collaborative testing. Utilizing the differences in the materials of these sensors, the system extracts the characteristics of gas molecules by simultaneously measuring an array of temperature-controlled sensors. Then, signal processing and pattern recognition algorithms are used for feature analysis and output. This approach suffers from problems such as the large number of required sensors, large size, high power consumption, lack of portability, and difficulty in integrating into small devices or equipment. Furthermore, most current electronic nose systems use metal-oxide-semiconductor (MOS) gas sensors, which require high temperatures for isothermal testing to acquire data, and the response reference value is prone to "drift" after prolonged operation, resulting in unstable test data. [Utility Model Content]

[0004] This invention overcomes the shortcomings of the prior art and provides a thermal runaway monitoring and identification device for power batteries in new energy vehicles, solving the problems of slow response of gas monitoring sensors, immature systems, and inconvenient interaction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A thermal runaway monitoring and identification device for power batteries in new energy vehicles, characterized in that: it includes...

[0007] The MEMS gas sensor module circuit consists of multiple MEMS gas sensors and is used to detect the voltage response signal of the gas in the power battery.

[0008] The thermal modulation module circuit is connected to the MEMS gas sensor module circuit and is used to adjust the input voltage of the heating layer in the MEMS gas sensor for thermal modulation.

[0009] The WIFI main control module circuit is connected to the MEMS gas sensor module circuit and the thermal modulation module circuit respectively. It is used to convert the voltage response signal detected by the MEMS gas sensor into a digital signal and to control the operation of the thermal modulation module circuit.

[0010] The intelligent device is wirelessly connected to the WIFI main control module circuit to send acquisition commands to the WIFI main control module circuit and receive voltage response digital signal data, and displays the analysis results after processing the data.

[0011] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: it further includes:

[0012] The button circuit is connected to the WIFI main control module circuit and is used to input reset and programming control commands;

[0013] The LED indicator circuit is connected to the WIFI main control module circuit and is used to indicate whether it is in data acquisition state.

[0014] USB connection circuit, connected to an external power source for power or communication;

[0015] The power supply circuit, connected to the USB connection circuit, is used to rectify and step down the external input power to supply power to the USB connection circuit, MEMS gas sensor module circuit, thermal modulation module circuit, WIFI main control module circuit, button circuit, and LED indicator circuit.

[0016] The thermal runaway monitoring and identification device for a new energy vehicle power battery as described above is characterized in that: the MEMS gas sensor module circuit consists of two or four MEMS gas sensors.

[0017] The above-mentioned new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the MEMS gas sensor module circuit includes MEMS gas sensor M1, MEMS gas sensor M2, MEMS gas sensor M3 and MEMS gas sensor M4.

[0018] Pin 1 of MEMS gas sensor M1 is connected to the thermal modulation module circuit, pin 2 of MEMS gas sensor M1 is connected to power supply VDD3V3, pin 7 of MEMS gas sensor M1 is grounded, pin 8 of MEMS gas sensor M1 is connected to one end of resistor R13 and the WIFI main control module circuit respectively, and the other end of resistor R13 is grounded.

[0019] Pin 1 of MEMS gas sensor M2 is connected to the thermal modulation module circuit, pin 2 of MEMS gas sensor M2 is connected to power supply VDD3V3, pin 7 of MEMS gas sensor M2 is grounded, pin 8 of MEMS gas sensor M2 is connected to one end of resistor R14 and the WIFI main control module circuit respectively, and the other end of resistor R14 is grounded.

[0020] Pin 1 of MEMS gas sensor M3 is connected to the thermal modulation module circuit, pin 2 of MEMS gas sensor M3 is connected to power supply VDD3V3, pin 7 of MEMS gas sensor M3 is grounded, pin 8 of MEMS gas sensor M3 is connected to one end of resistor R15 and the WIFI main control module circuit respectively, and the other end of resistor R15 is grounded.

[0021] Pin 1 of MEMS gas sensor M4 is connected to the thermal modulation module circuit, pin 2 of MEMS gas sensor M4 is connected to power supply VDD3V3, pin 7 of MEMS gas sensor M4 is grounded, pin 8 of MEMS gas sensor M4 is connected to one end of resistor R16 and the WIFI main control module circuit respectively, and the other end of resistor R16 is grounded.

[0022] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the thermal modulation module circuit includes a digital-to-analog converter chip U4, an operational amplifier U5.1, an operational amplifier U5.2, an operational amplifier U5.3, and an operational amplifier U5.4;

[0023] Pins 1-3 of the digital-to-analog converter chip U4 are connected to the WIFI main control module circuit, pin 4 is connected to the power supply VDD3V3 and one end of capacitor C6, with the other end of capacitor C6 grounded. Pin 5 of the digital-to-analog converter chip U4 is grounded. Pin 6 of the digital-to-analog converter chip U4 is connected to one end of capacitor C7, one end of resistor R21, one end of resistor R22, one end of resistor R23, and one end of resistor R24, with the other end of capacitor C7 grounded.

[0024] The other end of resistor R21 is connected to pin 3 of op-amp U5.1. Pin 2 of op-amp U5.1 is connected to pin 1 of op-amp U5.1 through resistor R20. Pin 4 of op-amp U5.1 is connected to power supply VIN. Pin 11 of op-amp U5.1 is grounded. Pin 1 of op-amp U5.1 is connected to EMS gas sensor M1.

[0025] The other end of resistor R22 is connected to pin 5 of op-amp U5.2. Pin 6 of op-amp U5.2 is connected to pin 7 of op-amp U5.2 through resistor R19. Pin 7 of op-amp U5.2 is connected to EMS gas sensor M2.

[0026] The other end of resistor R23 is connected to pin 10 of op-amp U5.3. Pin 9 of op-amp U5.3 is connected to pin 8 of op-amp U5.3 through resistor R17. Pin 8 of op-amp U5.3 is connected to EMS gas sensor M3.

[0027] The other end of resistor R24 ​​is connected to pin 12 of op-amp U5.4. Pin 13 of op-amp U5.4 is connected to pin 14 of op-amp U5.4 through resistor R18. Pin 14 of op-amp U5.4 is connected to EMS gas sensor M4.

[0028] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the WIFI main control module circuit includes a WIFI main control chip U2, pin 1 of the WIFI main control chip U2 is grounded, pin 2 of the WIFI main control chip U2 is connected to the positive terminal of electrolytic capacitor C1, one end of resistor R4, and power supply VDD3V3 respectively, the negative terminal of electrolytic capacitor C1 is grounded, pin 3 of the WIFI main control chip U2 is connected to the other end of resistor R4, pin 4 of the WIFI main control chip U2 is connected to EMS gas sensor M1, and pin 5 of the WIFI main control chip U2 is connected to EMS gas sensor M2. Pin 6 of the IFI main control chip U2 is connected to the EMS gas sensor M3; pin 7 of the WIFI main control chip U2 is connected to the EMS gas sensor M4; pin 15 of the WIFI main control chip U2 is grounded; pins 23, 30, and 37 of the WIFI main control chip U2 are connected to the digital-to-analog converter chip U4; pin 24 of the WIFI main control chip U2 is connected to the LED indicator circuit; pin 25 of the WIFI main control chip U2 is connected to the button circuit; pins 34-35 of the WIFI main control chip U2 are connected to the USB connection circuit; and pins 38-39 of the WIFI main control chip U2 are grounded.

[0029] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the button circuit includes a reset button EN and a programming button FLASH. One end of the reset button EN is grounded, and the other end of the reset button EN is connected to the collector of transistor Q1. The base of transistor Q1 is connected to the emitter of transistor Q2 and the USB connection circuit through resistor R9. The emitter of transistor Q1 is connected to one end of resistor R10 and the USB connection circuit. The other end of resistor R10 is connected to the base of transistor Q2. The collector of transistor Q2 is connected to the WIFI main control module circuit. One end of the programming button FLASH is grounded, and the other end of the programming button FLASH is connected to the WIFI main control module circuit and one end of resistor R5. The other end of resistor R5 is connected to the power supply VDD3V3.

[0030] The new energy vehicle power battery thermal runaway monitoring and identification device described above is characterized in that: the LED indicator circuit includes an indicator light RED and an indicator light BLUE, the negative terminal of the indicator light RED is grounded, and the positive terminal of the indicator light RED is connected to the power supply VDD3V3 through a resistor R12; the negative terminal of the indicator light BLUE is grounded through a resistor R11, and the positive terminal of the indicator light BLUE is connected to one end of a resistor R6 and the WIFI main control module circuit, and the other end of the resistor R6 is grounded.

[0031] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the USB connection circuit includes a Micro-USB interface USB1 and a URAT conversion chip U1; pin 1 of the Micro-USB interface USB1 is connected to pin 8 of the URAT conversion chip U1 and the power supply circuit; pin 2 of the Micro-USB interface USB1 is connected to pin 5 of the URAT conversion chip U1; pin 3 of the Micro-USB interface USB1 is connected to pin 4 of the URAT conversion chip U1; pins 4-54 and 6-7 of the Micro-USB interface USB1 are grounded; pin 3 of the URAT conversion chip U1 is grounded; pins 6-7 of the URAT conversion chip U1 are connected to power supply VDD3V3; pin 9 of the URAT conversion chip U1 is connected to power supply VDD3V3 through resistor R1; pins 24 and 28 of the URAT conversion chip U1 are connected to the button circuit; pin 25 of the URAT conversion chip U1 is connected to the WIFI main control module circuit through resistor R2; and pin 26 of the URAT conversion chip U1 is connected to the WIFI main control module circuit through resistor R3.

[0032] The above-described new energy vehicle power battery thermal runaway monitoring and identification device is characterized in that: the power supply circuit includes a voltage regulator U3, pin 1 of voltage regulator U3 is grounded, pin 2 of voltage regulator U3 is connected to pin 4 of voltage regulator U3, one end of capacitor C3, and one end of capacitor C4 respectively, the other end of capacitor C3 and the other end of capacitor C4 are grounded respectively, pin 3 of voltage regulator U3 is connected to one end of capacitor C2 and the negative terminal of Zener diode D1 respectively, the other end of capacitor C2 is grounded, the positive terminal of Zener diode D1 is connected to Micro-USB interface USB1, pin 3 of voltage regulator U3 outputs power supply VIN, and pin 2 of voltage regulator U3 outputs power supply VDD3V3.

[0033] The beneficial effects of this utility model are:

[0034] 1. This utility model is equipped with a MEMS gas sensor module circuit, which is composed of multiple MEMS gas sensors, greatly reducing the size of the gas monitoring device and also greatly shortening the time for the gas monitoring device to collect gas characteristic data.

[0035] 2. This utility model is equipped with a thermal modulation module circuit. By utilizing thermal modulation technology, the dependence on the gas-sensitive material of the MEMS gas sensor itself and the differences between materials can be reduced. This allows the gas monitoring device to achieve gas detection with a small number of MEMS gas sensors, reducing the size of the device and making it easier to carry and install.

[0036] 3. This utility model leverages the Internet of Things advantages of the WIFI main control module circuit composed of the ESP32WIFI ​​module to improve the convenience of interaction. [Image Description]

[0037] Figure 1 This is a schematic diagram of the power battery runaway gas monitoring and identification system of the present invention;

[0038] Figure 2 This is a diagram of the gas monitoring system of the present invention;

[0039] Figure 3 Image of a MEMS gas sensor;

[0040] Figure 4 This is a schematic diagram of the monitoring device's circuit board.

[0041] Figure 5 This is a schematic diagram of the USB connection circuit of the system of the present invention;

[0042] Figure 6 This is a schematic diagram of the power supply circuit of the system of the present invention;

[0043] Figure 7 This is a schematic diagram of the button circuit of the system of the present invention;

[0044] Figure 8 This is a schematic diagram of the LED indicator circuit of the system of the present invention;

[0045] Figure 9 This is a schematic diagram of the WIFI main control module circuit of the system of the present invention;

[0046] Figure 10 This is a schematic diagram of the MEMS gas sensor module circuit of the system of the present invention;

[0047] Figure 11 This is a schematic diagram of the thermal modulation module circuit of the system of the present invention. [Detailed Implementation]

[0048] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0050] like Figure 1 As shown, a thermal runaway monitoring and identification device for a new energy vehicle power battery includes:

[0051] MEMS gas sensor module circuit 1, composed of multiple MEMS gas sensors, is used to detect the voltage response signal of the power battery gas.

[0052] The thermal modulation module circuit 2 is connected to the MEMS gas sensor module circuit 1 and is used to adjust the input voltage of the heating layer in the MEMS gas sensor for thermal modulation.

[0053] The WIFI main control module circuit 3 is connected to the MEMS gas sensor module circuit 1 and the thermal modulation module circuit 2 respectively. It is used to convert the voltage response signal detected by the MEMS gas sensor into a digital signal and to control the operation of the thermal modulation module circuit 2.

[0054] The smart device 4 is wirelessly connected to the WIFI main control module circuit 3, and is used to send acquisition commands to the WIFI main control module circuit 3 and receive voltage response digital signal data, and display the analysis results after processing the data.

[0055] The button circuit 5 is connected to the WIFI main control module circuit 3 and is used to input reset and programming control commands.

[0056] LED indicator circuit 6 is connected to WIFI main control module circuit 3 and is used to indicate whether it is in data acquisition state;

[0057] USB connection circuit 7 is connected to an external power source for power or communication.

[0058] The power supply circuit 8 is connected to the USB connection circuit 7 and is used to rectify and step down the external input power supply to the USB connection circuit 7, MEMS gas sensor module circuit 1, thermal modulation module circuit 2, WIFI main control module circuit 3, button circuit 5, and LED indicator circuit 6.

[0059] This invention is based on the concept of electronic nose technology and has made further improvements. It mainly uses a MEMS gas sensor module circuit 1, which consists of four MEMS gas sensors with different response characteristics. Based on the MEMS gas sensors, the thermal modulation module circuit 2 uses thermal modulation technology to modulate the voltage and control the temperature of the heating layer of the MEMS gas sensors, achieving a self-heating working mode and eliminating the need for the high-temperature constant-temperature environment required by traditional electronic noses. Figure 2 As shown, based on the data collected by the MEMS gas sensor in response to temperature changes during the thermal modulation process, the data is transmitted to the client's mobile phone and computer and other smart devices 4 through the WIFI main control module circuit 3. Software is developed on the client to realize the real-time acquisition, display and storage of data. The deep learning attention mechanism algorithm in the smart device 4 is used for data processing, feature analysis and prediction of gas type.

[0060] like Figure 3 As shown, MEMS gas sensors are fabricated based on microelectromechanical systems (MEMS) technology and have advantages such as small size (only 5mm in length and width), low power consumption, the ability to provide a high-temperature environment for gas-sensitive materials with extremely low power consumption (only 2V is needed to heat to 300 degrees Celsius), and high integration. Due to their high sensitivity, small size, low power consumption, and low cost, these MEMS gas sensors are easy to integrate and easily arrayed. Figure 4 As shown, by designing a PCB circuit board, the MEMS gas sensor module circuit 1 composed of multiple MEMS gas sensors, the WIFI main control module circuit 3, and other circuits composed of related electronic components can be integrated into a small circuit board with a width of 42mm and a height of 55mm. This small circuit board integrates the thermal modulation control function of the MEMS gas sensor and the data interaction function between WIFI and the client, which effectively solves the problems of large size and high power consumption of the electronic nose.

[0061] In thermal modulation technology, the thermodynamic properties of the sensing material itself can be utilized to maximize the effectiveness of a single MEMS gas sensor, thereby reducing the number of MEMS gas sensors used. This case only requires two or four MEMS gas sensors. Furthermore, MEMS gas sensors offer high sensitivity and fast response, completing thermal modulation much faster than metal-oxide-semiconductor gas sensors, often achieving temperature modulation of 100℃-300℃ within 1 second. Combined with the rapid inference of attention mechanism algorithms, gas category prediction can be completed within milliseconds. Compared to an electronic nose, the entire power battery thermal runaway gas monitoring and identification system requires only about 1 second for a complete detection, significantly reducing detection time and perfectly meeting the needs of thermal runaway gas monitoring in new energy vehicle power batteries.

[0062] In this case, the circuit structure of each module on the circuit board is as follows: Figure 5-11 As shown.

[0063] like Figure 5 As shown, the USB connection circuit 7 uses a Micro-USB interface USB1 to connect to an external 5V power supply. At the same time, it connects the WIFI main control module circuit 3 and the computer and other smart devices 4 through the URAT conversion chip U1 of CP2102 via the Micro-USB interface USB1 for serial communication.

[0064] like Figure 6 As shown, since general diode rectification is prone to tailing, the power supply circuit 8 uses SS14 Schottky diode D1 for rectification and selects NCP1117 low dropout linear regulator U3 to reduce the 5V input voltage after rectification to 3.3V DC output to power other module circuits.

[0065] like Figure 7 As shown, the reset button EN and the programming button FLASH in the button circuit 5 control the reset and programming operations respectively. The button circuit 5 is designed as an automatic download and programming circuit. It uses the capacitor discharge delay to delay the pull-up of the EN signal level, so that the port GPIO0 is low and the rising edge of EN enters the download mode.

[0066] like Figure 8-9 As shown, the WIFI main control module circuit 3 uses the ESP32-WROOM-32E WIFI main control chip U2, and the LED indicator circuit 6 uses indicator lights RED and BLUE to indicate the power supply and whether data acquisition is in progress.

[0067] like Figure 9 As shown, the WIFI main control chip U2 in the WIFI main control module circuit 3 is connected to the MEMS gas sensors M1, M2, M3, and M4 in the MEMS gas sensor module circuit 1 through the SENSOR_VP, SENSOR_VN, GPIO34, and GPIO35 terminals, respectively. It collects the voltage response signals of the MEMS gas sensors to the detected gas and converts them into digital signals for processing and analysis.

[0068] like Figure 10-11As shown, the thermal modulation of the four MEMS gas sensors in the MEMS gas sensor module circuit 1 is achieved by continuously controlling the output of digital signals from the I / O ports through the WIFI main control module circuit 3. A single-channel, 12-bit AD5621 digital-to-analog converter chip U4 is used to convert the digital signal input from the GPIO23 terminal of the WIFI main control chip U2 in the WIFI main control module circuit 3 into a voltage signal. This voltage is then followed by a four-channel thermal modulation module circuit composed of four OPA4313IPWR operational amplifiers U5.1-U5.4, isolating the WIFI main control module circuit 3 (signal source) and the MEMS gas sensors (load) in the MEMS gas sensor module circuit 1, reducing the influence of the load on the signal source, and ensuring the accuracy and stability of the modulation voltage output by the WIFI main control module circuit 3. Simultaneously, to address the issue of different responses of MEMS gas sensors to the same gas under different environments and to enhance the environmental robustness of this design, the thermal modulation response data of the four MEMS gas sensors are combined in pairs. Through subtraction and normalization, the thermal modulation response characteristics of the MEMS gas sensors for a specific gas are obtained.

[0069] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A new energy vehicle power battery thermal runaway monitoring and identifying device, characterized in that: The application relates to a MEMS gas sensor module circuit (1) composed of multiple MEMS gas sensors for detecting the voltage response signal of power battery gas. A thermal modulation module circuit (2) is connected with the MEMS gas sensor module circuit (1) and used for adjusting the input voltage of the heating layer in the MEMS gas sensor for thermal modulation. A WIFI main control module circuit (3) is connected with the MEMS gas sensor module circuit (1) and the thermal modulation module circuit (2) respectively and used for converting the voltage response signal detected by the MEMS gas sensor into a digital signal and controlling the working of the thermal modulation module circuit (2). An intelligent device (4) is wirelessly connected with the WIFI main control module circuit (3) and used for sending a collection instruction to the WIFI main control module circuit (3) and receiving the voltage response digital signal data and displaying the analysis result after processing the data. 2.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 1, characterized in that: The application further comprises A key circuit (5) is connected with the WIFI main control module circuit (3) and used for inputting a reset and burning control instruction. An LED indication circuit (6) is connected with the WIFI main control module circuit (3) and used for indicating whether in a data collection state. A USB connection circuit (7) is connected with an external input power supply for power taking or communication connection. A power supply circuit (8) is connected with the USB connection circuit (7) and used for rectifying and step-down voltage of the external input power supply and supplying power to the USB connection circuit (7), the MEMS gas sensor module circuit (1), the thermal modulation module circuit (2), the WIFI main control module circuit (3), the key circuit (5) and the LED indication circuit (6). 3.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 1, characterized in that: The MEMS gas sensor module circuit (1) is composed of two or four MEMS gas sensors.

4. The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 1, characterized in that: The MEMS gas sensor module circuit (1) comprises MEMS gas sensors M1, M2, M3 and M4. The pin 1 of the MEMS gas sensor M1 is connected with the thermal modulation module circuit (2), the pin 2 of the MEMS gas sensor M1 is connected with a power supply VDD3V3, the pin 7 of the MEMS gas sensor M1 is grounded, the pin 8 of the MEMS gas sensor M1 is connected with one end of a resistor R13 and the WIFI main control module circuit (3) respectively, and the other end of the resistor R13 is grounded. The pin 1 of the MEMS gas sensor M2 is connected with the thermal modulation module circuit (2), the pin 2 of the MEMS gas sensor M2 is connected with the power supply VDD3V3, the pin 7 of the MEMS gas sensor M2 is grounded, the pin 8 of the MEMS gas sensor M2 is connected with one end of a resistor R14 and the WIFI main control module circuit (3) respectively, and the other end of the resistor R14 is grounded. The pin 1 of the MEMS gas sensor M3 is connected with the thermal modulation module circuit (2), the pin 2 of the MEMS gas sensor M3 is connected with the power supply VDD3V3, the pin 7 of the MEMS gas sensor M3 is grounded, the pin 8 of the MEMS gas sensor M3 is connected with one end of a resistor R15 and the WIFI main control module circuit (3) respectively, and the other end of the resistor R15 is grounded. MEMS gas sensor M4 pin 1 is connected with the thermal modulation module circuit (2), MEMS gas sensor M4 pin 2 is connected with power supply VDD3V3, MEMS gas sensor M4 pin 7 is grounded, MEMS gas sensor M4 pin 8 is connected with resistance R16 one end and WIFI master module circuit (3) respectively, resistance R16 other end is grounded.

5. The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 4, characterized in that: The thermal modulation module circuit (2) comprises digital-to-analog conversion chip U4, operational amplifier U5.1, operational amplifier U5.2, operational amplifier U5.3 and operational amplifier U5.4; Digital-to-analog conversion chip U4 pin 1-3 is connected with WIFI master module circuit (3) respectively, digital-to-analog conversion chip U4 pin 4 is connected with power supply VDD3V3 and capacitor C6 one end respectively, capacitor C6 other end is grounded, digital-to-analog conversion chip U4 pin 5 is grounded, digital-to-analog conversion chip U4 pin 6 is connected with capacitor C7 one end, resistance R21 one end, resistance R22 one end, resistance R23 one end and resistance R24 one end respectively, Resistance R21 other end is connected with operational amplifier U5.1 pin 3, operational amplifier U5.1 pin 2 is connected with operational amplifier U5.1 pin 1 through resistance R20, operational amplifier U5.1 pin 4 is connected with power supply VIN, operational amplifier U5.1 pin 11 is grounded, operational amplifier U5.1 pin 1 is connected with EMS gas sensor M1; Resistance R22 other end is connected with operational amplifier U5.2 pin 5, operational amplifier U5.2 pin 6 is connected with operational amplifier U5.2 pin 7 through resistance R19, operational amplifier U5.2 pin 7 is connected with EMS gas sensor M2; Resistance R23 other end is connected with operational amplifier U5.3 pin 10, operational amplifier U5.3 pin 9 is connected with operational amplifier U5.3 pin 8 through resistance R17, operational amplifier U5.3 pin 8 is connected with EMS gas sensor M3; Resistance R24 other end is connected with operational amplifier U5.4 pin 12, operational amplifier U5.4 pin 13 is connected with operational amplifier U5.4 pin 14 through resistance R18, operational amplifier U5.4 pin 14 is connected with EMS gas sensor M4. 6.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 5, characterized in that: The WIFI master module circuit (3) comprises a WIFI master chip U2, the pin 1 of the WIFI master chip U2 is grounded, the pin 2 of the WIFI master chip U2 is connected with the positive pole of an electrolytic capacitor C1, one end of a resistor R4 and a power supply VDD3V3 respectively, the negative pole of the electrolytic capacitor C1 is grounded, the pin 3 of the WIFI master chip U2 is connected with the other end of the resistor R4, the pin 4 of the WIFI master chip U2 is connected with an EMS gas sensor M1, the pin 5 of the WIFI master chip U2 is connected with an EMS gas sensor M2, the pin 6 of the WIFI master chip U2 is connected with an EMS gas sensor M3, the pin 7 of the WIFI master chip U2 is connected with an EMS gas sensor M4, the pin 15 of the WIFI master chip U2 is grounded, the pin 23, the pin 30 and the pin 37 of the WIFI master chip U2 are connected with a digital-analog conversion chip U4 respectively, the pin 24 of the WIFI master chip U2 is connected with an LED indicating circuit (6), the pin 25 of the WIFI master chip U2 is connected with a key circuit (5), the pin 34-35 of the WIFI master chip U2 is connected with a USB connection circuit (7) respectively, and the pin 38-39 of the WIFI master chip U2 is grounded.

7. The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 2, characterized in that: The key circuit (5) comprises a reset key EN and a burning key FLASH, one end of the reset key EN is grounded, the other end of the reset key EN is connected with the collector of a triode Q1, the base of the triode Q1 is connected with the emitter of a triode Q2 and the USB connection circuit (7) through a resistor R9 respectively, the emitter of the triode Q1 is connected with one end of a resistor R10 and the USB connection circuit (7) respectively, the other end of the resistor R10 is connected with the base of the triode Q2, and the collector of the triode Q2 is connected with the WIFI master module circuit (3); one end of the burning key FLASH is grounded, the other end of the burning key FLASH is connected with the WIFI master module circuit (3) and one end of a resistor R5 respectively, and the other end of the resistor R5 is connected with a power supply VDD3V3. 8.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 7, characterized in that: The LED indicating circuit (6) comprises an indicating lamp RED and an indicating lamp BLUE, the negative pole of the indicating lamp RED is grounded, and the positive pole of the indicating lamp RED is connected with a power supply VDD3V3 through a resistor R12; the negative pole of the indicating lamp BLUE is grounded through a resistor R11, and the positive pole of the indicating lamp BLUE is connected with one end of a resistor R6 and the WIFI master module circuit (3) respectively, and the other end of the resistor R6 is grounded. 9.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 8, characterized in that: The USB connecting circuit (7) comprises a Micro-USB interface USB1 and a URAT conversion chip U1, the pin 1 of the Micro-USB interface USB1 is connected with the pin 8 of the URAT conversion chip U1, the pin 2 of the Micro-USB interface USB1 is connected with the pin 5 of the URAT conversion chip U1, the pin 3 of the Micro-USB interface USB1 is connected with the pin 4 of the URAT conversion chip U1, the pin 4-54 and the pin 6-7 of the Micro-USB interface USB1 are grounded respectively, the pin 3 of the URAT conversion chip U1 is grounded, the pin 6-7 of the URAT conversion chip U1 is connected with the power supply VDD3V3 respectively, the pin 9 of the URAT conversion chip U1 is connected with the power supply VDD3V3 through the resistor R1, the pin 24 and the pin 28 of the URAT conversion chip U1 are connected with the key circuit (5) respectively, the pin 25 of the URAT conversion chip U1 is connected with the WIFI master module circuit (3) through the resistor R2, the pin 26 of the URAT conversion chip U1 is connected with the WIFI master module circuit (3) through the resistor R3. 10.The new energy vehicle power battery thermal runaway monitoring and identifying device according to claim 9, characterized in that: The power supply circuit (8) comprises a voltage stabilizer U3, the pin 1 of the voltage stabilizer U3 is grounded, the pin 2 of the voltage stabilizer U3 is connected with the pin 4 of the voltage stabilizer U3, the one end of the capacitor C3 and the one end of the capacitor C4 respectively, the other end of the capacitor C3 and the other end of the capacitor C4 are grounded respectively, the pin 3 of the voltage stabilizer U3 is connected with the one end of the capacitor C2 and the negative electrode end of the voltage stabilizing diode D1 respectively, the other end of the capacitor C2 is grounded, the positive electrode end of the voltage stabilizing diode D1 is connected with the Micro-USB interface USB1, the pin 3 of the voltage stabilizer U3 outputs the power supply VIN, the pin 2 of the voltage stabilizer U3 outputs the power supply VDD3V3.

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