Battery heat release rate equivalent simulation method and device

Abstract

The invention discloses a battery heat release rate equivalent simulation method. A proper shell is selected; electrolyte is injected into the test shell, mixed combustible gas is injected, and the components and the volume of the mixed combustible gas are consistent with those of gas generated in the thermal runaway process of the battery needing to be simulated and measured according to an experiment; measuring the internal pressure of the shell; simulating a thermal runaway state, wherein the simulation mode is realized by heating the test shell; monitoring real-time change values of internal temperature and pressure; when the temperature and pressure conditions of thermal runaway are reached, ignition operation is executed; measuring real-time values of heat release rate data, temperature of the shell and pressure; the heat release rate data further comprises temperature data of combustible gas and electrolyte combustion after ignition. The combustion process of the battery is restored to the maximum extent, and effective simulation of thermal runaway of the battery can be realized.

Description

Technical Field

[0001] The present invention belongs to the field of battery fire safety, and in particular relates to a battery heat release rate equivalent simulation method and device. Background Art

[0002] As the dual carbon goals continue to advance, my country has made remarkable achievements in the development of new energy industries such as wind power generation, photovoltaic power generation, new energy storage, power batteries and hydrogen energy. New energy technologies are constantly innovating, and the scale of the industry is constantly expanding. It has become an important force in the global new energy industry. However, with the continuous iteration of new energy technologies and the innovative application of new materials and new processes, new fire risks and safety hazards have also been brought about, especially in the field of new energy storage and power batteries represented by secondary batteries.

[0003] At present, the simulation of battery thermal runaway combustion process in the laboratory is crucial for the research of battery disaster consequences and fire prevention design. However, the battery is an electrochemical system with complex nonlinear characteristics. Its thermal runaway process will be accompanied by the generation of a large amount of flammable gas and electrolyte vapor. At present, no effective device and method have been reported to simulate battery combustion. Most of them are made into complete batteries, and then the combustion state and combustion process of the battery thermal runaway are monitored and tested by inducing thermal runaway. The production cycle is long, the cost is high, and a large amount of raw materials are wasted. Summary of the invention

[0004] The purpose of the present invention is to provide a battery heat release rate equivalent simulation method and device to solve the technical problems of realizing and repeatedly utilizing a battery thermal runaway process simulation device.

[0005] In order to solve the above technical problems, the specific technical solutions of a battery heat release rate equivalent simulation method and device of the present invention are as follows:

[0006] A battery heat release rate equivalent simulation method,

[0007] S1, select a test housing that is consistent with the size of the battery cavity to be simulated;

[0008] S2, injecting electrolyte into the test housing, wherein the weight and composition of the injected electrolyte are the same as the weight and composition of the electrolyte injected in the battery production to be simulated;

[0009] S3, injecting a mixed combustible gas, wherein the composition and volume of the mixed combustible gas are consistent with the gas generated by the battery in the thermal runaway process to be simulated according to experimental determination;

[0010] S4, measuring the internal pressure of the shell;

[0011] S5, simulating thermal runaway state, the simulation is achieved by heating the test shell;

[0012] S6, monitor the real-time changes of internal temperature and pressure;

[0013] S7, when the temperature and pressure conditions of thermal runaway are reached, an ignition operation is performed;

[0014] The ignition operation is to ignite the combustible gas and the electrolyte;

[0015] S8, measuring heat release rate data, real-time values ​​of shell temperature and pressure;

[0016] The heat release rate data also includes temperature data of the combustion of the combustible gas and the electrolyte after ignition.

[0017] Furthermore, a support plate is provided in the inner cavity of the shell, and the support plate is in the shape of a fin, and the middle of the fin can be filled with positive electrode material, negative electrode material, separator and electrolyte as well as positive and negative electrode substrates;

[0018] The positive and negative electrode substrates are copper foil and aluminum foil.

[0019] Furthermore, the gas generated by the battery during the thermal runaway process to be simulated does not include the gas generated by the electrolysis reaction.

[0020] The present invention also provides a battery heat release rate equivalent simulation device for implementing the simulation method, comprising:

[0021] The shell is designed according to the actual size of the battery cavity to be simulated, and the inner cavity size of the shell is consistent with the inner cavity size of the battery to be simulated;

[0022] The shell is provided with a pressure relief valve, which is used to prevent explosion caused by overpressure inside the shell;

[0023] The electrolyte injection unit is arranged on one side of the housing, and comprises an injection port, which is connected to the quantitative injection device. The injection port is provided with a solenoid valve 3, which is used to control the opening and closing of the injection port. When the solenoid valve is opened, the quantitative injection device injects the electrolyte required for the experiment, and the injected mass and composition are preset according to the experiment.

[0024] A thermal runaway simulation unit is arranged outside the bottom of the housing, and the runaway simulation unit includes a ceramic sheet connected to the bottom of the housing;

[0025] The ceramic sheet is connected to a heating plate, and the heating plate is used to heat the electrolyte in the battery housing;

[0026] The gas injection unit is arranged on the other side of the shell, and the gas injection unit includes an air inlet, the air inlet is connected to a connecting pipe, the connecting pipe is connected to a combustible gas source, and a solenoid valve 1 is arranged on the air inlet;

[0027] Solenoid valve 1 is used to control the opening and closing of the air inlet. When it is opened, the combustible gas of the combustible source is injected into the shell;

[0028] The composition and volume of the combustible gas are determined based on the gas produced by the non-electrolytic reaction during the thermal runaway process as determined experimentally;

[0029] The electric ignition unit is arranged on the top of the housing, and comprises an air outlet and a solenoid valve 2 arranged on the air outlet; the electric ignition unit also comprises an electric ignition needle arranged outside the air outlet;

[0030] Data measurement unit, including,

[0031] A pressure sensor is arranged on the housing, and the pressure sensor is used to measure the pressure inside the housing;

[0032] A calorimeter is arranged above the electric ignition unit, and is used to measure the heat release rate of the electrolyte and gas combustion ejected from the shell after thermal runaway is induced;

[0033] a second thermocouple disposed between the electric ignition unit and the calorimeter, the second thermocouple being used to measure the combustion temperature of the ignited combustible gas and the electrolyte;

[0034] The control box is provided with temperature display and pressure display, as well as control buttons for air intake, liquid intake, air exhaust, ignition and heating functions.

[0035] Furthermore, the shell is made of metal, and stainless steel, aluminum, and iron can be selected; a support plate is arranged in the inner cavity of the shell, and the support plate is fin-shaped. The positive electrode material, negative electrode material, diaphragm and electrolyte as well as positive and negative electrode substrates can be filled in the middle of the fin, and the positive and negative electrode substrates are copper foil and aluminum foil.

[0036] Further, a first thermocouple is provided between the ceramic sheet and the shell, and the first thermocouple is used to measure the temperature at which the ceramic sheet and the shell are heated;

[0037] The ceramic sheet is placed between the battery equivalent housing and the heating plate for buffering and making the heating more uniform.

[0038] Furthermore, the combustible gas injected into the outer shell needs to be obtained by measuring the gas components produced after the actual battery thermal runaway and then subsequently proportioning, and the injected volume is the same as the gas volume generated by the battery thermal runaway.

[0039] Further, the control buttons for air intake, liquid intake, air outlet, ignition and heating functions are respectively connected to the gas injection unit, electrolyte injection unit, electric ignition unit and thermal runaway simulation unit;

[0040] The solenoid valves configured at the air outlet, air inlet and liquid inlet can be opened and closed by remote control.

[0041] Further, the electric ignition needle is fixed to the outside of the gas outlet through a bracket connected to the housing;

[0042] The electric ignition needle is used to ignite the combustible gas and electrolyte vapor released inside the shell.

[0043] The present invention further provides a control method for a battery heat release rate equivalent simulation device, the steps comprising:

[0044] SS1, open the liquid inlet solenoid valve, fill the electrolyte into the shell of the battery equivalent battery shell, and then close the liquid inlet solenoid valve;

[0045] SS2, open the air inlet solenoid valve, fill the battery equivalent shell with combustible gas, then close the air inlet solenoid valve, and monitor the value through the pressure sensor.

[0046] SS3, turn on the heating plate, the heating plate heats the ceramic sheet, observe the temperature display, and the heating plate is powered off after reaching the preset temperature and pressure values; realize the thermal runaway combustion behavior of the battery under overheating or overcharging conditions in different working conditions;

[0047] SS4, open the solenoid valve at the gas outlet and turn on the electric ignition device at the same time to ignite the combustible gas and electrolyte vapor;

[0048] SS5, obtains the combustion characteristics of the simulated battery by recording the temperature value of the thermocouple, the value of the pressure sensor and the heat release rate data of the calorimeter;

[0049] SS6,compares the test data with the real battery data, and simulates the combustion characteristics of the simulated battery and the real battery by changing the injected gas volume and electrolyte mass.

[0050] The battery heat release rate equivalent simulation method and device of the present invention have the following advantages:

[0051] 1. The present invention adopts a battery equivalent shell, which is consistent with the actual battery size, avoiding the error caused by the battery size;

[0052] 2. The present invention uses the gas composition and volume generated by battery thermal runaway as combustible gas, which is consistent with the actual scenario and can effectively simulate the battery combustion temperature;

[0053] 3. The present invention realizes the gasification and combustion of the electrolyte by adding the electrolyte and heating it, thereby restoring the combustion process of the battery to the greatest extent.

[0054] 4. The present invention can simulate the battery combustion characteristics under different working conditions such as overheating and overcharging by changing the injected gas pressure and the electrolyte quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of the battery heat release rate equivalent simulation method of the present invention;

[0056] Figure 2 It is a schematic structural diagram of a battery heat release rate equivalent simulation device of the present invention;

[0057] Description of the markings in the figure:

[0058] 1. Shell, 2. Combustible gas source, 3. Connecting pipe, 4-1. Solenoid valve 1, 4-2. Air inlet,

[0059] 5. Pressure sensor, 6-1. Solenoid valve 2, 6-2. Air outlet, 7-1. Bracket, 7-2. Electric ignition needle, 8. Pressure relief valve, 9-1. Solenoid valve 3, 9-2. Liquid filling port, 9-3. Quantitative injection device, 10. Ceramic sheet, 11. Heating plate, 12. First thermocouple, 13. Second thermocouple, 14. Calorimeter, 15. Control box. DETAILED DESCRIPTION

[0060] In order to better understand the purpose, structure and function of the present invention, a battery heat release rate equivalent simulation method and device of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0061] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication of units within two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0064] Through the disassembly and research of a large number of thermal runaway batteries, it was found that the main substance involved in combustion after the thermal runaway of the battery is the electrolyte. In some cases, part of the negative electrode material and / or the separator participates in the combustion, among which the positive electrode metal oxide, copper foil, aluminum foil and metal current collecting ears and current collecting sheets do not participate in the combustion.

[0065] The purpose of the present invention is to provide a battery heat release rate equivalent simulation method and device, which is used to deeply analyze the standard fire model and fire spread mechanism, improve the existing fire risk assessment theoretical system, systematically study the explosion mechanism of energy storage system, and provide a scientific basis for suppressing explosion accidents.

[0066] Embodiment 1

[0067] A battery heat release rate equivalent simulation method, the steps comprising:

[0068] S1, select a test housing that is consistent with the size of the battery cavity to be simulated;

[0069] A support plate is arranged in the inner cavity of the shell, and the support plate is in the shape of a fin, and the middle of the fin can be filled with positive electrode material, negative electrode material, diaphragm and electrolyte as well as positive and negative electrode substrates;

[0070] The positive and negative electrode substrates are copper foil and aluminum foil;

[0071] S2, injecting electrolyte into the test housing, wherein the weight and composition of the injected electrolyte are the same as the weight and composition of the electrolyte injected in the battery production to be simulated;

[0072] S3, injecting a mixed combustible gas, wherein the composition and volume of the mixed combustible gas are consistent with the gas generated by the battery in the thermal runaway process to be simulated according to experimental determination;

[0073] The gas generated by the battery during the thermal runaway process to be simulated does not include the gas generated by the electrolysis reaction;

[0074] S4, measuring the internal pressure of the shell;

[0075] S5, simulating thermal runaway state, the simulation is achieved by heating the test shell;

[0076] S6, monitor the real-time changes of internal temperature and pressure;

[0077] S7, when the temperature and pressure conditions of thermal runaway are reached, an ignition operation is performed;

[0078] The ignition operation is to ignite the combustible gas and the electrolyte;

[0079] S8, measuring heat release rate data, real-time values ​​of shell temperature and pressure;

[0080] The heat release rate data also includes temperature data of the combustion of the combustible gas and the electrolyte after ignition.

[0081] Embodiment 2

[0082] A battery heat release rate equivalent simulation device, comprising:

[0083] The shell is designed according to the actual size of the battery cavity to be simulated, and the inner cavity size of the shell is consistent with the inner cavity size of the battery to be simulated;

[0084] The shell 1 is made of metal, and stainless steel, aluminum, and iron can be selected; a support plate is arranged in the inner cavity of the shell, and the support plate is fin-shaped, and the middle of the fin can be filled with positive electrode material, negative electrode material, diaphragm and electrolyte, and positive and negative electrode substrates, and the positive and negative electrode substrates are copper foil and aluminum foil;

[0085] When the support plate is filled with the materials included in the battery, the actual state can be more realistically reflected in the thermal runaway simulation;

[0086] The housing is provided with a pressure relief valve 8, which is used to prevent explosion caused by overpressure inside the housing;

[0087] The electrolyte injection unit is arranged on one side of the shell, and includes an injection port 9-2, which is connected to the quantitative injection device 9-3. The injection port 9-2 is provided with a solenoid valve 9-1, and the solenoid valve is used to control the opening and closing of the injection port 9-2. When the solenoid valve is opened, the quantitative injection device 9-3 injects the electrolyte required for the experiment, and the injection quality and composition are preset according to the experiment.

[0088] The thermal runaway simulation unit is arranged outside the bottom of the housing, and the thermal runaway simulation unit includes a ceramic sheet 10 connected to the bottom of the housing.

[0089] The ceramic sheet 10 is connected to a heating plate 11 , and the heating plate 11 is used to heat the electrolyte in the battery housing 1 .

[0090] A first thermocouple 12 is provided between the ceramic sheet 10 and the housing, and the first thermocouple 12 is used to measure the temperature at which the ceramic sheet 10 and the housing are heated;

[0091] The ceramic sheet 10 is placed between the battery equivalent shell 1 and the heating plate 11 for buffering to make the heating more uniform.

[0092] The gas injection unit is arranged on the other side of the shell, and the gas injection unit includes an air inlet 4-2, the air inlet 4-2 is connected to a connecting pipe 3, the connecting pipe 3 is connected to a combustible gas source 2, and an electromagnetic valve 4-1 is arranged on the air inlet 4-2.

[0093] The solenoid valve 4-1 is used to control the opening and closing of the air inlet 4-2. When it is opened, the combustible gas of the combustible gas source 2 is injected into the housing;

[0094] The composition and volume of the combustible gas are determined based on experimental measurements of gases produced by non-electrolytic reactions during thermal runaway.

[0095] The combustible gas injected into the outer shell needs to be obtained by measuring the gas components produced after the actual battery thermal runaway and then subsequently proportioning. The injected volume is the same as the gas volume generated by the battery thermal runaway.

[0096] The electric ignition unit is arranged at the top of the housing, and includes an air outlet 6-2 and a solenoid valve 6-1 arranged on the air outlet 6-2; the electric ignition unit also includes an electric ignition needle 7-2 arranged outside the air outlet 6-2;

[0097] The electric ignition needle 7-2 is fixed to the outside of the air outlet 6-2 through a bracket 7-1 connected to the shell.

[0098] The electric ignition needle 7-2 is used to ignite the combustible gas and electrolyte vapor released inside the shell;

[0099] Data measurement unit, including,

[0100] A pressure sensor 5 is arranged on the housing, and the pressure sensor 5 is used to measure the pressure inside the housing;

[0101] A calorimeter 14 is arranged above the electric ignition unit, and the calorimeter 14 is used to measure the heat release rate of the electrolyte and gas combustion sprayed out of the shell after the thermal runaway is triggered;

[0102] The second thermocouple 13 is arranged between the electric ignition unit and the calorimeter 14, and is used to measure the combustion temperature of the ignited combustible gas and the electrolyte.

[0103] The control box 15 is provided with temperature display and pressure display, as well as control buttons for air intake, liquid intake, air outlet, ignition and heating functions.

[0104] The control buttons for air intake, liquid intake, air exhaust, ignition and heating functions are respectively connected to the gas injection unit, the electrolyte injection unit, the electric ignition unit and the thermal runaway simulation unit.

[0105] The solenoid valves configured at the air outlet 6-2, the air inlet 4-2, and the liquid injection port 9-2 can be opened and closed by remote control.

[0106] Embodiment 3

[0107] A control method for a battery heat release rate equivalent simulation device, the operating steps comprising:

[0108] SS1, open the liquid inlet solenoid valve, fill the electrolyte into the shell of the battery equivalent battery shell, and then close the liquid inlet solenoid valve;

[0109] SS2, open the air inlet solenoid valve, fill the combustible gas into the battery equivalent shell, then close the air inlet solenoid valve, and monitor the value through the pressure sensor;

[0110] SS3, turn on the heating plate, the heating plate heats the ceramic sheet, observe the temperature display, and the heating plate is powered off after reaching the preset temperature and pressure values; realize the thermal runaway combustion behavior of the battery under overheating or overcharging conditions in different working conditions;

[0111] SS4, open the solenoid valve at the gas outlet and turn on the electric ignition device at the same time to ignite the combustible gas and electrolyte vapor;

[0112] SS5, obtains the combustion characteristics of the simulated battery by recording the temperature value of the thermocouple, the value of the pressure sensor and the heat release rate data of the calorimeter;

[0113] SS6,compares the test data with the real battery data, and simulates the combustion characteristics of the simulated battery and the real battery by changing the injected gas volume and electrolyte mass.

[0114] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A battery heat release rate equivalent simulation method, characterized in that: S1, select a test housing that is consistent with the size of the battery cavity to be simulated; S2, injecting electrolyte into the test housing, wherein the weight and composition of the injected electrolyte are the same as the weight and composition of the electrolyte injected in the battery production to be simulated; S3, injecting a mixed combustible gas, wherein the composition and volume of the mixed combustible gas are consistent with the gas generated by the battery in the thermal runaway process to be simulated according to experimental determination; S4, measuring the internal pressure of the shell; S5, simulating thermal runaway state, the simulation is achieved by heating the test shell; S6, monitor the real-time changes of internal temperature and pressure; S7, when the temperature and pressure conditions of thermal runaway are reached, an ignition operation is performed; The ignition operation is to ignite the combustible gas and the electrolyte; S8, measuring heat release rate data, real-time values ​​of shell temperature and pressure; The heat release rate data also includes temperature data of the combustion of the combustible gas and the electrolyte after ignition.

2. The battery heat release rate equivalent simulation method according to claim 1, characterized in that: A support plate is arranged in the inner cavity of the shell, and the support plate is in the shape of a fin, and the middle of the fin can be filled with positive electrode material, negative electrode material, diaphragm and electrolyte as well as positive and negative electrode substrates; The positive and negative electrode substrates are copper foil and aluminum foil.

3. The battery heat release rate equivalent simulation method according to claim 2, characterized in that: The gas generated by the battery during the thermal runaway process that needs to be simulated does not include the gas generated by the electrolysis reaction.

4. A battery heat release rate equivalent simulation device, characterized in that: include, The shell is designed according to the actual size of the battery cavity to be simulated, and the inner cavity size of the shell is consistent with the inner cavity size of the battery to be simulated; The shell is provided with a pressure relief valve, which is used to prevent explosion caused by overpressure inside the shell; The electrolyte injection unit is arranged on one side of the housing, and comprises an injection port, which is connected to the quantitative injection device. The injection port is provided with a solenoid valve 3, which is used to control the opening and closing of the injection port. When the solenoid valve is opened, the quantitative injection device injects the electrolyte required for the experiment, and the injected mass and composition are preset according to the experiment. A thermal runaway simulation unit is arranged outside the bottom of the housing, and the runaway simulation unit includes a ceramic sheet connected to the bottom of the housing; The ceramic sheet is connected to a heating plate, and the heating plate is used to heat the electrolyte in the battery housing; The gas injection unit is arranged on the other side of the shell, and the gas injection unit includes an air inlet, the air inlet is connected to a connecting pipe, the connecting pipe is connected to a combustible gas source, and a solenoid valve 1 is arranged on the air inlet; Solenoid valve 1 is used to control the opening and closing of the air inlet. When it is opened, the combustible gas of the combustible source is injected into the shell; The composition and volume of the combustible gas are determined based on the gas produced by the non-electrolytic reaction during the thermal runaway process as determined experimentally; The electric ignition unit is arranged on the top of the housing, and comprises an air outlet and a solenoid valve 2 arranged on the air outlet; the electric ignition unit also comprises an electric ignition needle arranged outside the air outlet; Data measurement unit, including, A pressure sensor is arranged on the housing, and the pressure sensor is used to measure the pressure inside the housing; A calorimeter is arranged above the electric ignition unit, and is used to measure the heat release rate of the electrolyte and gas combustion ejected from the shell after thermal runaway is induced; a second thermocouple disposed between the electric ignition unit and the calorimeter, the second thermocouple being used to measure the combustion temperature of the ignited combustible gas and the electrolyte; The control box is provided with temperature display and pressure display, as well as control buttons for air intake, liquid intake, air exhaust, ignition and heating functions.

5. The battery heat release rate equivalent simulation device according to claim 4, characterized in that: The shell is made of metal, and stainless steel, aluminum, and iron can be selected; a support plate is arranged in the inner cavity of the shell, and the support plate is fin-shaped. The positive electrode material, negative electrode material, diaphragm and electrolyte as well as positive and negative electrode substrates can be filled in the middle of the fin, and the positive and negative electrode substrates are copper foil and aluminum foil.

6. The battery heat release rate equivalent simulation device according to claim 4, characterized in that: A first thermocouple is arranged between the ceramic sheet and the shell, and the first thermocouple is used to measure the temperature of the ceramic sheet and the shell when they are heated; The ceramic sheet is placed between the battery equivalent housing and the heating plate for buffering and making the heating more uniform.

7. The battery heat release rate equivalent simulation device according to claim 4, characterized in that: The combustible gas injected into the outer shell needs to be obtained by measuring the gas components produced after the actual battery thermal runaway and then subsequently proportioning. The injected volume is the same as the gas volume generated by the battery thermal runaway.

8. The battery heat release rate equivalent simulation device according to claim 4, characterized in that: The control buttons for air intake, liquid intake, air outlet, ignition and heating functions are respectively connected to the gas injection unit, electrolyte injection unit, electric ignition unit and thermal runaway simulation unit; The solenoid valves configured at the air outlet, air inlet and liquid inlet can be opened and closed by remote control.

9. The battery heat release rate equivalent simulation device according to claim 4, characterized in that: The electric ignition needle is fixed to the outside of the gas outlet through a bracket connected to the shell; The electric ignition needle is used to ignite the combustible gas and electrolyte vapor released inside the shell.

10. A control method for a battery heat release rate equivalent simulation device, characterized in that: The steps include, SS1, open the liquid inlet solenoid valve, fill the electrolyte into the shell of the battery equivalent battery shell, and then close the liquid inlet solenoid valve; SS2, open the air inlet solenoid valve, fill the battery equivalent shell with combustible gas, then close the air inlet solenoid valve, and monitor the value through the pressure sensor. SS3, turn on the heating plate, the heating plate heats the ceramic sheet, observe the temperature display, and the heating plate is powered off when the preset temperature and pressure values ​​are reached; Realize the thermal runaway combustion behavior of batteries under overheating or overcharging conditions in different working conditions; SS4, open the solenoid valve at the gas outlet and turn on the electric ignition device at the same time to ignite the combustible gas and electrolyte vapor; SS5, obtains the combustion characteristics of the simulated battery by recording the temperature value of the thermocouple, the value of the pressure sensor and the heat release rate data of the calorimeter; SS6,compares the test data with the real battery data, and simulates the combustion characteristics of the simulated battery and the real battery by changing the injected gas volume and electrolyte mass.

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