Battery thermal runaway inducing device and method

Abstract

The invention relates to the technical field of battery testing experiments, and discloses a battery thermal runaway inducing device, which comprises an anti-explosion gas collecting system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system, a battery thermal runaway inducing system and a battery thermal runaway inducing system, the heating sleeve is used for heating the to-be-tested battery, a thermocouple is arranged in the center of the heating sleeve, a data acquisition module is arranged at one end of the thermocouple, and the data acquisition module is in contact with the positive electrode and the negative electrode of the to-be-tested battery through voltage connecting wires; the data acquisition module is used for monitoring the temperature and voltage of the battery to be measured; the inert gas containing bottle is used for containing inert gas; and the sensing monitoring module is used for monitoring a signal generated in the explosion-proof collection system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing experiments, and in particular to a battery thermal runaway inducing device and method. Background Art

[0002] As the core component of new energy technology, lithium-ion batteries have high energy density, long cycle life, and excellent environmental performance, and are widely used in electric vehicles, energy storage systems, portable electronic devices, etc. However, with the continuous advancement of lithium-ion battery technology and the expansion of its application fields, its safety issues, especially the risk of thermal runaway, have become a key factor restricting the further development and application of lithium-ion batteries.

[0003] Thermal runaway refers to a violent exothermic reaction inside a lithium-ion battery under certain conditions (such as overcharging, short circuit, high temperature environment, etc.), which causes the battery temperature to rise sharply and may even cause combustion or explosion. Thermal runaway not only damages the battery itself, but may also pose a serious threat to the surrounding environment and personnel safety. Therefore, the development of effective battery thermal runaway induction experimental methods and early warning technologies is of great significance for understanding the thermal runaway mechanism, evaluating battery safety, and preventing thermal runaway accidents.

[0004] In the prior art, experimental methods for inducing battery thermal runaway mostly use adiabatic accelerating calorimetry, differential scanning calorimeter and some self-developed devices to study battery thermal runaway. However, the cost of using adiabatic accelerating calorimeter is high, and some self-developed devices lack simple and effective research methods and cannot be integrated and integrated, which is not conducive to rapid and accurate research on battery thermal runaway. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem that the existing battery thermal runaway inducing device cannot take into account both the use cost and the accurate performance of battery thermal runaway experiments.

[0006] In order to solve the above technical problems, the present invention provides a battery thermal runaway inducing device, the device comprising:

[0007] An explosion-proof gas collection system, the explosion-proof collection system is used to collect the gas generated after the battery to be tested explodes, and the battery to be tested is located inside the explosion-proof collection system;

[0008] A heating sleeve, the heating sleeve surrounds the battery to be tested, the heating sleeve contacts the battery to be tested, the heating sleeve is connected to an external power source, the heating sleeve is used to heat the battery to be tested, a thermocouple is arranged at the center of the heating sleeve, a data acquisition module is arranged at one end of the thermocouple, the data acquisition module contacts the positive and negative electrodes of the battery to be tested through a voltage connection line, and the data acquisition module is used to monitor the temperature of the battery to be tested;

[0009] An inert gas containing bottle, the inert gas containing bottle is used to contain inert gas, the inert gas containing bottle is located outside the explosion-proof gas collection system, and the inert gas containing bottle is connected to the explosion-proof collection system;

[0010] A sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system. The sensor monitoring module includes a camera, a computer, a thermometer, and a pressure sensor. The sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system, including temperature, air pressure, real-time video recording, and voltage.

[0011] Furthermore, the device also includes:

[0012] Voltage connecting wires are arranged at both ends of the battery to be tested, and one end of the voltage connecting wire is connected to a data acquisition instrument to record the voltage changes at both ends of the battery.

[0013] An air compressor, the air compressor is located outside the explosion-proof gas collection system, the air compressor is connected to the explosion-proof gas collection system through a vent, and the air compressor is used to provide a power source for the explosion-proof gas collection system;

[0014] Refractory bricks are located next to the battery to be tested and are used to prevent the circuit from being damaged during a violent reaction.

[0015] Furthermore, the inert gas bottle is a nitrogen bottle, and the inert gas is nitrogen.

[0016] Furthermore, the sensor monitoring module also includes an early warning unit, and the early warning unit is used to issue an early warning based on the signal generated inside the explosion-proof collection system.

[0017] Furthermore, the data acquisition module is a data acquisition instrument.

[0018] According to another aspect of the present invention, a method for inducing thermal runaway of a battery is provided, the method comprising:

[0019] S10, pre-treating the battery to be tested and placing it inside an explosion-proof gas collection system;

[0020] S20, connecting the heating sleeve to an external power source, and connecting the data acquisition module to the battery to be tested;

[0021] S30, vacuum-treating the explosion-proof gas system and then introducing an inert gas;

[0022] S40, supplying power to the heating sleeve through the external power supply, thereby heating the battery to be tested;

[0023] S50, monitoring the battery to be tested and recording experimental data of the battery to be tested being heated from an initial state to a thermal runaway state, wherein the thermal runaway state is determined by analyzing and monitoring the experimental data.

[0024] Furthermore, the method for determining the thermal runaway state includes:

[0025] The explosion-proof gas collection system produces a phenomenon of violent smoke release and viscous liquid outflow. When the battery temperature rise rate is greater than the heating rate of the heating ring, it is determined to be a thermal runaway state;

[0026] Fire and explosion in the explosion-proof gas collection system are considered to be thermal runaway;

[0027] When the data acquisition module detects that the temperature rise rate of the battery to be tested is greater than 3°C / s, it is determined to be in a thermal runaway state.

[0028] Furthermore, the method further comprises:

[0029] S60: After determining that the battery to be tested is in a thermal runaway state, the early warning unit issues an alarm.

[0030] Furthermore, the early warning unit issuing an alarm includes the following steps:

[0031] S61, monitoring the temperature mutation, voltage change, and gas generation characteristics of the battery to be tested according to the data acquisition module and the sensor monitoring module;

[0032] S62, converting the monitored data into electrical signals to issue an alarm of a corresponding color and informing the staff through a communication device.

[0033] Compared with the prior art, the battery thermal runaway inducing device according to the embodiment of the present invention has the following beneficial effects:

[0034] The embodiment of the present invention adopts an explosion-proof gas collection system, a heating sleeve, an inert gas container and a sensor monitoring module component. These components are easily available in the market and are relatively low in price, which helps to reduce the overall cost and can safely carry out battery thermal runaway research. The embodiment of the present invention integrates multiple monitoring devices into a sensor monitoring module. An early warning unit can be flexibly added to this sensor monitoring module to provide timely early warning information to operators. The sensor monitoring module can also automatically collect and record data such as temperature, air pressure, real-time video and voltage during the experiment without manual intervention, thereby improving the efficiency and accuracy of the experiment. At the same time, the operating process of the battery thermal runaway induction experiment is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a block diagram of a battery thermal runaway inducing device provided by an embodiment of the present invention;

[0036] Figure 2 is a schematic structural diagram of a battery thermal runaway inducing device provided in an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of voltage and temperature changes during a battery thermal runaway process provided by an embodiment of the present invention;

[0038] Figure 4 It is a flow chart of a method for inducing thermal runaway of a battery provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0040] like Figure 1 As shown, in an optional embodiment of the present invention, a battery thermal runaway inducing device comprises:

[0041] An explosion-proof gas collection system, the explosion-proof collection system is used to collect the gas generated after the battery to be tested explodes, and the battery to be tested is located inside the explosion-proof collection system;

[0042] A heating sleeve, the heating sleeve surrounds the battery to be tested, the heating sleeve contacts the battery to be tested, the heating sleeve is connected to an external power source, the heating sleeve is used to heat the battery to be tested, a thermocouple is arranged at the center of the heating sleeve, a data acquisition module is arranged at one end of the thermocouple, the data acquisition module contacts the positive and negative electrodes of the battery to be tested through a voltage connection line, and the data acquisition module is used to monitor the temperature and voltage of the battery to be tested;

[0043] An inert gas containing bottle, the inert gas containing bottle is used to contain inert gas, the inert gas containing bottle is located outside the explosion-proof gas collection system, and the inert gas containing bottle is connected to the explosion-proof collection system;

[0044] A sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system. The sensor monitoring module includes a camera, a computer, a thermometer, and a pressure sensor. The sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system, including temperature, air pressure, real-time video recording, and voltage.

[0045] Among them, the explosion-proof gas collection system is used to safely collect and process the gas released by the battery during thermal runaway or explosion. The heating sleeve is a heating device that surrounds the battery to be tested. It is usually made of high-temperature resistant materials. The battery is heated by the heating sleeve to simulate the high-temperature environment that the battery may encounter in actual use, inducing thermal runaway of the battery. Thermocouple is a temperature sensor that works based on the principle of thermoelectric effect and can measure and convert temperature differences into electrical signals. The data acquisition module receives the voltage data at both ends of the temperature and voltage connection wires of the thermocouple. The inert gas holding bottle is a container for storing inert gases. Inert gases such as nitrogen and argon are not easy to react chemically with other substances. They provide an inert gas environment in the experiment, reduce the influence of oxygen on the thermal runaway process of the battery, and improve the accuracy of the experimental results. Sensor monitoring module. The sensor monitoring module is used to monitor various parameters in the explosion-proof gas collection system during the experiment, including temperature, air pressure, real-time video recording and voltage.

[0046] Specifically, through the following embodiments combined Figure 1-3 Further explanation

[0047] like Figure 1-3 As shown. The working process of the battery thermal runaway inducing device is:

[0048] The first step is sample preparation. Using a charge and discharge test cabinet, we first charge the battery to be tested to 4.0V at a current of 1 / 3C, and then perform a constant voltage charging phase until the current drops below 0.05C. Next, the battery to be tested is discharged to 2.0V at the same 1 / 3C current. After the discharge is completed, the battery to be tested is charged again with the same current until it reaches a state of charge (SOC) of 70%, thereby obtaining a 0.7SOC battery to be tested for testing.

[0049] The second step is line connection. Battery heating arrangement: Make a heating sleeve with the same outer diameter as the battery cell, open a 5cm hole in the center of the heating sleeve to place the thermocouple, and the heating sleeve should not touch the thermocouple to avoid inaccurate temperature measurement.

[0050] External power supply line connection: one side of the voltage connection line is connected to the positive and negative poles of the battery, and the other side is connected to the positive and negative poles of the data acquisition module. The data acquisition instrument is used as the data acquisition module.

[0051] One end of the thermocouple is glued to the surface of the battery to be tested with high temperature glue to monitor the temperature change of the battery. The heating sleeve is connected to the heating wire, and the other end is a plug, which is connected to the socket with an external power switch. The battery heating is controlled by the external power switch on the socket.

[0052] Connection of sensor monitoring module: Connect the real-time recording camera to the computer and install the lighting to observe the battery thermal runaway experiment phenomenon. Turn on the power of the explosion-proof gas collection system.

[0053] Other connections: Connect the air compressor to the vent of the explosion-proof gas collection system to open the pneumatic switch of the explosion-proof gas collection system. Connect the inert gas container to the explosion-proof gas collection system to facilitate the introduction of inert gas. Nitrogen is selected as the inert gas of this utility model to make the battery to be tested react under inert gas. Place refractory bricks in front of the heating to prevent the circuit from being damaged when the reaction is violent.

[0054] The third step is parameter setting. The data acquisition instrument records one data point per second with an accuracy of 550W and a voltage of 220V.

[0055] Step 4. After all lines are arranged, close the door of the explosion-proof gas collection system. At this time, the volume of the explosion-proof gas collection system is 80L.

[0056] The fifth step is to open the vacuum button of the explosion-proof gas collection system, vacuum it three times, and finally introduce nitrogen. At this time, the pressure is -29.8kPa, the temperature is 20.6℃, and the open circuit voltage is 3.425V. Then turn on the external power supply to heat the battery under test and observe the heating phenomenon of the battery under test.

[0057] In the sixth step, during the heating process of the battery to be tested, the temperature rises, the safety valve on the positive electrode side opens, smoke is released violently, and a viscous liquid flows out. When the heating rate of the battery to be tested is greater than the heating rate of the heating ring, it is judged as thermal runaway (or fire, explosion, or temperature rise rate greater than 3°C / s).

[0058] Step 7. Record the pressure (-15.6 kPa) and temperature (25.4°C) after the pressure stabilizes, and calculate using the ideal state gas equation PV = nRT. The gas production can be calculated using the pressure change before and after gas production, see formula (1).

[0059]

[0060] Where V gas is the gas production, V m is the gas molar volume, which is 24.5 L / mol at 25 °C and 1.01×105 Pa, P1 is the stable pressure after thermal runaway, V0 is the initial volume, T1 is the stable temperature after thermal runaway (in Kelvin, K), R is the molar gas constant, which is 8.31 J / (mol·K), and V is obtained after calculation. gas It is 12.05L.

[0061] In the eighth step, the generated gas is analyzed by gas chromatograph, and the main gas types are C2H4, CO, H2, CO2, etc.

[0062] Step 9: Figure 2 As shown in the figure, the maximum temperature of the battery under test in thermal runaway reaches 175°C. It can be observed that the voltage drops sharply when the temperature rises to about 150°C, which indicates that an internal short circuit occurs, and the subsequent temperature rise rate is greater than 3°C / s, which determines that the battery has thermal runaway and stops heating.

[0063] The battery used in this embodiment is a sodium ion battery. When the battery state of charge is 0.7, the maximum temperature of thermal runaway is lower than that of other positive electrode material system batteries, indicating that the sodium ion battery has strong stability and high safety.

[0064] The embodiment of the present invention adopts an explosion-proof gas collection system, a heating sleeve, an inert gas container and a sensor monitoring module component. These components are easily available in the market and are relatively low in price, which helps to reduce the overall cost and can safely carry out battery thermal runaway research. The embodiment of the present invention integrates multiple monitoring devices into a sensor monitoring module. An early warning unit can be flexibly added to this sensor monitoring module to provide timely early warning information to operators. The sensor monitoring module can also automatically collect and record data such as temperature, air pressure, real-time video and voltage during the experiment without manual intervention, thereby improving the efficiency and accuracy of the experiment. At the same time, the operating process of the battery thermal runaway induction experiment is simplified.

[0065] In an optional embodiment of the present invention, the device further comprises:

[0066] An air compressor, the air compressor is located outside the explosion-proof gas collection system, the air compressor is connected to the explosion-proof gas collection system through a vent, and the air compressor is used to provide gas pressure for the explosion-proof gas collection system;

[0067] Refractory bricks are located next to the battery to be tested and are used to prevent the circuit from being damaged during a violent reaction.

[0068] Among them, the air compressor is located on the outside of the explosion-proof gas collection system, and is connected to the explosion-proof gas collection system through a vent to provide the system with the required gas pressure. This helps to quickly and effectively control the gas environment inside the explosion-proof gas collection system in the battery thermal runaway experiment to ensure the safety of the experiment. In the present invention, refractory bricks are placed next to the battery to be tested. Their main function is to prevent high temperature or thermal shock from damaging the surrounding circuits when the battery undergoes a violent reaction (such as thermal runaway or explosion). The high temperature resistance of refractory bricks provides additional protection for experimental equipment.

[0069] In an optional embodiment of the present invention, the inert gas bottle is a nitrogen bottle, and the inert gas is nitrogen.

[0070] In an optional embodiment of the present invention, the sensor monitoring module further includes an early warning unit, and the early warning unit is used to issue an early warning according to a signal generated inside the explosion-proof collection system.

[0071] Among them, when the early warning unit detects abnormal signals, it will issue an early warning in time to remind the experimenters to take necessary response measures to prevent the situation from further deteriorating.

[0072] Specifically, the sensor monitoring module monitors the voltage changes of the battery, and the gas sensor in the sensor monitoring module monitors the gas production characteristics of the battery. Once there is a sudden change in temperature, pressure change, and battery gas production, the signal processor of the early warning module will convert these signals into electrical signals and send out alarms of corresponding colors. It will also send out warnings of different colors for signal changes caused by the thermal runaway process of the battery, and will also call the inspector as soon as possible.

[0073] In the present invention, the sensor monitoring module includes an early warning unit, which provides real-time monitoring and early warning for the battery thermal runaway experiment and enhances the safety of the experiment.

[0074] In an optional embodiment of the present invention, the data acquisition module is a data acquisition instrument.

[0075] According to another aspect of the present invention, a method for inducing thermal runaway of a battery is provided, the method comprising:

[0076] S10, pre-treating the battery to be tested and placing it inside an explosion-proof gas collection system;

[0077] S20, connecting the heating sleeve to an external power source, and connecting the data acquisition module to the battery to be tested;

[0078] S30, vacuum-treating the explosion-proof gas system and then introducing an inert gas;

[0079] S40, supplying power to the heating sleeve through the external power supply, thereby heating the battery to be tested;

[0080] S50, monitoring the battery to be tested and recording experimental data of the battery to be tested being heated from an initial state to a thermal runaway state, wherein the thermal runaway state is determined by analyzing and monitoring the experimental data.

[0081] The embodiment of the present invention can minimize the influence of the external environment on the experimental results and ensure the accuracy and reliability of the experimental data by placing the battery to be tested inside the explosion-proof gas collection system after pretreatment, vacuum treatment and inert gas filling. The embodiment of the present invention uses an external power supply to power the heating sleeve, thereby realizing accurate heating treatment of the battery to be tested. This method can flexibly control the heating rate and temperature range to meet different experimental requirements. The embodiment of the present invention adopts an explosion-proof gas collection system, a heating sleeve, an inert gas holding bottle and a sensor monitoring module assembly, which are easy to obtain and low in price on the market, which helps to reduce the overall cost and can safely carry out battery thermal runaway research; the embodiment of the present invention integrates multiple monitoring devices into a sensor monitoring module, and an early warning unit can be flexibly added to this sensor monitoring module to provide timely early warning information for operators. The sensor monitoring module can also automatically collect and record data such as temperature, air pressure, real-time video and voltage during the experiment without manual intervention, thereby improving the efficiency and accuracy of the experiment; at the same time, it simplifies the operation process of the battery thermal runaway induction experiment.

[0082] In an optional embodiment of the present invention, the method for determining the thermal runaway state includes:

[0083] The explosion-proof gas collection system produces a phenomenon of violent smoke release and viscous liquid outflow. When the battery temperature rise rate is greater than the heating rate of the heating ring, it is determined to be a thermal runaway state;

[0084] Fire and explosion in the explosion-proof gas collection system are considered to be thermal runaway;

[0085] When the data acquisition module detects that the temperature rise rate of the battery to be tested is greater than 3°C / s, it is determined to be in a thermal runaway state.

[0086] In the present invention, the combination of multiple judgment methods enables the experimenter to make a more rapid and accurate response when facing battery thermal runaway, thereby effectively reducing the safety risks during the experiment. This not only protects the safety of the experimenter, but also ensures the integrity of the experimental equipment and the accuracy of the experimental data.

[0087] In an optional embodiment of the present invention, the method further comprises:

[0088] S60: After determining that the battery to be tested is in a thermal runaway state, the early warning unit issues an alarm.

[0089] Furthermore, the early warning unit issuing an alarm includes the following steps:

[0090] S61, monitoring the temperature mutation, voltage change, and gas generation characteristics of the battery to be tested according to the data acquisition module and the sensor monitoring module;

[0091] S62, converting the monitored data into electrical signals to issue an alarm of a corresponding color and informing the staff through a communication device.

[0092] Specifically, before issuing an alarm, the early warning unit will make a comprehensive judgment based on the multi-dimensional data (such as temperature mutation, voltage change, gas production characteristics, etc.) monitored by the data acquisition module and the sensor monitoring module. When the battery to be tested is judged to be in a thermal runaway state, the early warning unit can immediately issue an alarm. The early warning unit converts the monitored data into an electrical signal and issues an alarm of the corresponding color. This intuitive alarm display method allows experimenters to quickly understand the current status of the battery and judge the severity of the situation based on the alarm color. The early warning unit also has the function of informing staff through a communication device. This means that even if the experimenter is not at the experimental site, he can receive the alarm information through remote communication equipment and respond in time. This remote communication capability greatly improves the flexibility and safety of the experiment.

[0093] In the embodiment of the present invention, the alarm function of the early warning unit significantly enhances the safety and controllability of the experiment, and can solve the problem that the existing battery thermal runaway cannot give an alarm in time.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery thermal runaway inducing device, characterized in that: The device comprises: An explosion-proof gas collection system, the explosion-proof collection system is used to collect the gas generated after the battery to be tested explodes, and the battery to be tested is located inside the explosion-proof collection system; A heating sleeve, the heating sleeve surrounds the battery to be tested, the heating sleeve contacts the battery to be tested, the heating sleeve is connected to an external power source, the heating sleeve is used to heat the battery to be tested, a thermocouple is arranged at the center of the heating sleeve, a data acquisition module is arranged at one end of the thermocouple, the data acquisition module contacts the positive and negative electrodes of the battery to be tested through a voltage connection line, and the data acquisition module is used to monitor the temperature and voltage of the battery to be tested; An inert gas containing bottle, the inert gas containing bottle is used to contain inert gas, the inert gas containing bottle is located outside the explosion-proof gas collection system, and the inert gas containing bottle is connected to the explosion-proof collection system; A sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system. The sensor monitoring module includes a camera, a computer, a thermometer, and a pressure sensor. The sensor monitoring module is used to monitor the signals generated inside the explosion-proof collection system, including temperature, air pressure, real-time video recording, and voltage.

2. The battery thermal runaway inducing device according to claim 1, characterized in that: The device also includes: Voltage connecting wires are arranged at both ends of the battery, and one end of the voltage connecting wire is connected to a data acquisition instrument to record the voltage changes at both ends of the battery. An air compressor, the air compressor is located outside the explosion-proof gas collection system, the air compressor is connected to the explosion-proof gas collection system through a vent, and the air compressor is used to provide a power source for the explosion-proof gas collection system to enable it to extract / release gas; Refractory bricks are located next to the battery to be tested and are used to prevent the circuit from being damaged during a violent reaction.

3. The battery thermal runaway inducing device according to claim 2, characterized in that: The inert gas bottle is a nitrogen bottle, and the inert gas is nitrogen.

4. The battery thermal runaway inducing device according to claim 3, characterized in that: The sensor monitoring module also includes an early warning unit, which is used to issue an early warning based on the signal generated inside the explosion-proof collection system.

5. The battery thermal runaway inducing device according to claim 4, characterized in that: The data acquisition module is a data acquisition instrument.

6. A method for inducing thermal runaway of a battery, characterized in that: The method comprises: S10, pre-treating the battery to be tested and placing it inside an explosion-proof gas collection system; S20, connecting the heating sleeve to an external power source, and connecting the data acquisition module to the battery to be tested; S30, vacuum-treating the explosion-proof gas system and then introducing an inert gas; S40, supplying power to the heating sleeve through the external power supply, thereby heating the battery to be tested; S50, monitoring the battery under test through a data acquisition module and a sensor monitoring module and recording experimental data of the battery under test being heated from an initial state to a thermal runaway state, wherein the thermal runaway state is determined by analyzing and monitoring the experimental data.

7. The battery thermal runaway inducing method according to claim 6, characterized in that: The method for determining the thermal runaway state includes: The explosion-proof gas collection system produces a phenomenon of violent smoke release and viscous liquid outflow. When the battery temperature rise rate is greater than the heating rate of the heating ring, it is determined to be a thermal runaway state; Fire and explosion in the explosion-proof gas collection system are considered to be thermal runaway; When the data acquisition module detects that the temperature rise rate of the battery to be tested is greater than 3°C / s, it is determined to be in a thermal runaway state.

8. The method for inducing thermal runaway of a battery according to claim 6, characterized in that: The method further comprises: S60: After determining that the battery to be tested is in a thermal runaway state, the early warning unit issues an alarm.

9. The battery thermal runaway inducing method according to claim 8, characterized in that: The early warning unit sending out an alarm comprises the following steps: S61, monitoring the temperature mutation, voltage change, and gas generation characteristics of the battery to be tested according to the data acquisition module and the sensor monitoring module; S62, converting the monitored data into electrical signals to issue an alarm of a corresponding color and informing the staff through a communication device.

Images