Lithium battery fire extinguishing experiment device and method

Abstract

The invention relates to the technical field of lithium battery thermal runaway and fire extinguishing, and provides a lithium battery fire extinguishing experiment device and method.The lithium battery fire extinguishing experiment device comprises a box body, a heating plate, a supporting assembly and at least two sets of fire extinguishing agent spraying assemblies; the heating plate is horizontally and fixedly installed in the box body through the supporting assembly, and the at least two sets of fire extinguishing agent spraying assemblies are configured to spray different agents to the heating plate; wherein the heating plate is a bottomless hollow cone, the inner side face of the hollow cone faces the top wall of the box body, the cone top of the hollow cone is connected with the supporting assembly, and the difference value between the specific heat capacity of the heating plate and the specific heat capacity of the lithium battery is equal to a target difference value. According to the lithium battery fire extinguishing experiment device, the inhibition effect of different fire extinguishing agents on lithium battery fire disasters can be efficiently and accurately simulated, and powerful support is provided for research, development and application of subsequent fire extinguishing products.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal runaway and fire extinguishing of lithium batteries, and in particular to a lithium battery fire extinguishing experimental device and method. Background Art

[0002] In recent years, the development of lithium battery technology has enabled new energy vehicles to be rapidly popularized. However, new energy vehicles may cause lithium battery short circuits under conditions such as collision accidents, leading to thermal runaway and combustion and explosion. Among them, the danger of lithium battery fires and the difficulty of controlling and extinguishing them are much higher than general fires. The high-temperature explosions and released gases they produce will seriously threaten the safety of equipment and personnel. Existing lithium battery fire extinguishing experiments have many limitations and shortcomings in evaluating the thermal management and safety performance of lithium batteries, such as the low accuracy of test results. Summary of the invention

[0003] The present invention provides a lithium battery fire extinguishing test device and method, which are used to solve the problem of low accuracy of test results when evaluating thermal management and safety performance of lithium batteries in the prior art.

[0004] In a first aspect, the present invention provides a lithium battery fire extinguishing test device, comprising: a box, a heating plate, a support assembly, and at least two sets of fire extinguishing agent spray assemblies; The heating plate is horizontally fixedly installed in the box body through the supporting assembly, and the at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the heating plate; Among them, the heating plate is a bottomless hollow cone, the inner side of the hollow cone faces the top wall of the box, the top of the hollow cone is connected to the support assembly, and the difference between the specific heat capacity of the heating plate and the specific heat capacity of the lithium battery is equal to the target difference.

[0005] According to a lithium battery fire extinguishing test device provided by the present invention, the lithium battery fire extinguishing test device further includes a temperature measuring component, there are multiple temperature measuring components, and at least one temperature measuring component is arranged on each side of the hollow cone.

[0006] According to a lithium battery fire extinguishing test device provided by the present invention, the lithium battery fire extinguishing test device also includes a control mainboard, the heating plate and the fire extinguishing agent spray assembly are electrically connected to the control mainboard, and the control mainboard is configured to control the working state of the heating plate, and make the temperature value of each side of the hollow cone the same, and control the spraying state of each set of the fire extinguishing agent spray assembly according to the temperature value of the heating plate.

[0007] According to a lithium battery fire extinguishing experimental device provided by the present invention, each set of the fire extinguishing agent spray assembly includes a pump body, a nozzle, a control valve and an infusion tube. The nozzle is arranged in the box body, and the nozzle faces the side of the hollow cone away from the cone top. The pump body, the control valve and the nozzle are sequentially arranged on the infusion tube along the length direction of the infusion tube.

[0008] According to a lithium battery fire extinguishing test device provided by the present invention, the cone top of the hollow cone is provided with a through hole, and the lithium battery fire extinguishing test device also includes a liquid collecting box, and the liquid collected by the hollow cone flows into the liquid collecting box through the through hole.

[0009] According to a lithium battery fire extinguishing test device provided by the present invention, the support assembly includes a support frame and a gasket, the support frame includes a support plate and support legs, the support legs are arranged on the support plate, the gasket is attached to the top of the support plate, the gasket is provided with an installation space, the hollow cone is located in the installation space, the liquid collecting box is located below the support plate, the gasket and the support plate are respectively provided with a first through hole and a second through hole connected to the through hole, and the liquid collected by the hollow cone flows into the liquid collecting box through the through hole, the first through hole and the second through hole in sequence.

[0010] According to a lithium battery fire extinguishing test device provided by the present invention, a side of the hollow cone away from the cone top is exposed to the installation space.

[0011] According to a lithium battery fire extinguishing test device provided by the present invention, the heating plate is a bottomless hollow quadrangular pyramid; and / or,

[0012] The heating plate is a metal plate.

[0013] According to a lithium battery fire extinguishing test device provided by the present invention, the height of the hollow cone is 10 cm to 20 cm.

[0014] In a second aspect, the present invention also provides a lithium battery fire extinguishing test method, comprising: Heating the hollow cone so that the temperature value of each side of the hollow cone is equal to the target temperature value; According to the temperature value of the hollow cone, the spraying state of each set of the fire extinguishing agent spraying assembly is controlled so that the corresponding fire extinguishing agent spraying assembly can spray the agent on the side of the hollow cone away from the cone top.

[0015] The lithium battery fire extinguishing test device and method provided by the present invention starts the heating plate to simulate the overheating or fire state of the lithium battery. When the preset conditions are met (such as the temperature value of the heating plate reaches the set threshold), at least one set of fire extinguishing agent spray components is started to spray, and the fire extinguishing effect (temperature change of the heating plate) is observed and recorded. In this way, the inhibitory effect of different fire extinguishing agents on lithium battery fires can be analyzed, providing a reference for practical applications. Through the lithium battery fire extinguishing test device of the present invention, the inhibitory effect of different fire extinguishing agents on lithium battery fires can be efficiently and accurately simulated, providing strong support for the research and development and application of subsequent fire protection products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the lithium battery fire extinguishing experimental device provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of the heating plate provided by the present invention.

[0019] Figure 3 It is a flow chart of the lithium battery fire extinguishing test method provided by the present invention.

[0020] Reference numerals: 1. Pump body; 2. Control valve; 3. Nozzle; 4. Box body; 5. Heating plate; 51. Through hole; 6. Gasket; 7. Support frame; 8. Liquid collecting box. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the lithium battery fire extinguishing test device according to the embodiment of the present invention comprises: a box body 4, a heating plate 5, a support assembly and at least two sets of fire extinguishing agent spraying assemblies.

[0023] The heating plate 5 is fixedly installed in the box 4 horizontally through the support assembly, and at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the heating plate 5. Among them, each set of fire extinguishing agent spraying assembly can work simultaneously, or work in sequence according to the installation sequence.

[0024] Wherein, the heating plate 5 is a bottomless hollow cone, the inner side of the hollow cone faces the top wall of the box, the cone top of the hollow cone contacts the support assembly, and the difference between the specific heat capacity of the heating plate 5 and the specific heat capacity of the lithium battery is equal to the target difference. Wherein, the target difference can be greater than or equal to 0 and less than or equal to 0.5. In other words, the specific heat capacity of the heating plate 5 is roughly the same as or consistent with the specific heat capacity of the lithium battery, so that heat can be quickly conducted, energy utilization can be improved, and the progress and response speed of the experiment can be accelerated. In addition, at least two sets of fire extinguishing agent spray assemblies are respectively configured to spray different agents on the inner side of the hollow cone.

[0025] It should be noted that the box 4 can be made of high temperature resistant and corrosion resistant materials, such as stainless steel or high temperature resistant alloys, to withstand the high temperatures that may be generated during the experiment. The interior of the box 4 is provided with a heat insulation layer to reduce the impact of heat on the external environment during the experiment. The top and sides of the box 4 are provided with observation windows, which are made of high temperature resistant transparent materials (such as quartz glass) to facilitate observation of the experimental process. The bottom of the box 4 is provided with a drain port and an exhaust gas discharge port for cleaning the residues after the experiment and discharging harmful gases.

[0026] In addition, the heating plate 5 is a bottomless hollow cone shape, which can effectively control the flow and collection of the spray reagent, ensuring the stability and safety of the experiment. The shape of the heating plate 5 is customized to the size of the lithium battery in a 1:1 ratio, ensuring that the surface of the lithium battery can be completely covered, improving the heating efficiency and uniformity, thereby ensuring the accuracy and reliability of the experimental results. An electric heating element (such as a resistance wire or a heating film) is embedded in the heating plate 5, and the heating temperature is adjusted by an external controller.

[0027] In addition, at least two sets of fire extinguishing agent spraying components are provided, each set of components includes a liquid storage tank, a pump, a pipe, a nozzle and a control valve 2. The liquid storage tanks store different fire extinguishing agents, such as dry powder, water-based foam, inert gas, etc., to meet the simulation requirements of different types of lithium battery fires. The pump is responsible for transporting the fire extinguishing agent from the liquid storage tank to the nozzle, and the spraying time and spraying amount can be accurately controlled by the control valve 2. The nozzle ensures that the fire extinguishing agent can be accurately sprayed onto the inner side of the hollow cone.

[0028] In an embodiment of the present invention, the heating plate 5 is started to simulate the overheating or fire state of the lithium battery. When the preset conditions are met (such as the temperature value of the heating plate 5 reaches the set threshold), at least one set of fire extinguishing agent spraying components is started to spray, and the fire extinguishing effect (temperature change of the heating plate 5) is observed and recorded. In this way, the inhibitory effect of different fire extinguishing agents on lithium battery fires can be analyzed, providing a reference for practical applications. Through the lithium battery fire extinguishing experimental device of the present invention, the inhibitory effect of different fire extinguishing agents on lithium battery fires can be efficiently and accurately simulated, providing strong support for the research and development and application of subsequent fire protection products.

[0029] In an optional embodiment, the lithium battery fire extinguishing test device further includes a temperature measuring component, and there are multiple temperature measuring components, and at least one temperature measuring component is provided on each side of the hollow cone. Among them, the temperature measuring component can be a thermocouple. In other words, each side of the hollow cone is equipped with a thermocouple, which can monitor the temperature change on the surface of the heating plate 5 in real time, and can ensure the consistency of the temperature of each side of the hollow cone, thereby ensuring the uniformity and stability of the heating plate 5 during the heating process, and improving the accuracy of the experimental data.

[0030] Specifically, the number of temperature measuring parts is determined according to the number of sides of the hollow cone, ensuring that each side has at least one temperature measuring point. If the side of the cone is more complex or has a larger area, it can be considered to set multiple temperature measuring points on each side to improve the measurement accuracy.

[0031] In an embodiment of the present invention, before the formal experiment, the heating plate 5 can be preheated and the temperature change displayed by the temperature measuring component can be observed to ensure that the experimental environment is stable and meets expectations. During the heating process, when the preset conditions are met (such as the temperature reaches the set threshold), the fire extinguishing agent spray component is started to spray, and the temperature data is continuously monitored to evaluate the fire extinguishing effect, such as real-time monitoring and recording of the temperature data displayed by the temperature measuring component, so as to subsequently analyze the relationship between the inhibitory effect of different fire extinguishing agents on lithium battery fires and temperature changes. After the experiment, the temperature data collected by the temperature measuring component is sorted and analyzed, combined with the fire extinguishing effect evaluation results, to provide a scientific basis for the research and development and application of lithium battery fire protection technology.

[0032] In an optional embodiment, the lithium battery fire extinguishing test device also includes a control main board, and the heating plate and the fire extinguishing agent spray assembly are electrically connected to the control main board. The control main board is configured to control the working state of the heating plate so that the temperature value of each side of the hollow cone is the same, and to control the spraying state of each set of fire extinguishing agent spray assemblies according to the temperature value of the heating plate.

[0033] Among them, by setting up multiple sets of fire extinguishing agent spray components, the amount and type of different agents can be accurately controlled to be added at different time periods or simultaneously, which improves the flexibility and diversity of the experiment.

[0034] The control mainboard uses a high-performance microcontroller (such as ARM Cortex-M series) as the core processor, which is responsible for data processing, logic judgment and command output. The control mainboard is integrated with a communication interface (such as RS485, CAN bus or Wi-Fi module) for remote monitoring and parameter adjustment. The heating plate 5 is used to simulate the overheating or thermal runaway scenario of the lithium battery, and the temperature is controlled by a resistance wire or a heating element. The heating plate 5 has a built-in temperature measuring device (temperature sensor), or the control mainboard directly monitors its temperature through a temperature measuring device set outside the heating plate 5.

[0035] According to the experimental requirements, the target temperature of the heating plate 5 is set by controlling the main board, and the heating power is adjusted in real time to maintain or reach the set temperature. When the temperature detected by the temperature measuring component reaches the preset safety threshold, the fire extinguishing agent spray assembly is controlled to open and release the fire extinguishing agent according to the preset fire extinguishing strategy. For example, one set of the fire extinguishing agent spray assembly is opened, or two sets of the fire extinguishing agent spray assembly are opened at the same time, or one set of the fire extinguishing agent spray assembly is opened first, and then the other set of the fire extinguishing agent spray assembly is opened.

[0036] In an optional embodiment, if Figure 1 As shown, each set of fire extinguishing agent spray assembly includes a pump body 1, a nozzle 3, a control valve 2 and a liquid infusion tube. The nozzle 3 is arranged in the box body 4, and the nozzle 3 faces the side of the hollow cone away from the top of the cone. The pump body 1, the control valve 2 and the nozzle 3 are sequentially arranged on the liquid infusion tube along the length direction of the liquid infusion tube. Among them, the pressure pump and the control valve 2 are equipped to accurately adjust the pressure, flow rate and injection mode of the spraying agent, ensure the spraying accuracy and real-time monitoring of the agent, and further improve the reliability of the experimental data and the experimental efficiency. Among them, the liquid sprayed by the nozzle 3 needs to be able to be evenly sprayed on each inner side of the hollow cone.

[0037] Among them, the pump body 1 is the power source of the fire extinguishing agent spray assembly, which is responsible for extracting the fire extinguishing agent in the liquid storage tank and delivering it to the nozzle 3 through the liquid infusion tube. The pump body 1 is usually made of corrosion-resistant and high-pressure resistant materials to ensure stable operation under long-term work and harsh environments. The pump body 1 can be equipped with a motor or a pneumatic device as a driving source, which can be selected according to experimental requirements and site conditions.

[0038] The control valve 2 is located between the pump body 1 and the nozzle 3, and is used to control the flow rate and spraying state of the fire extinguishing agent. The control valve 2 can be opened, closed or adjusted according to the instructions of the control mainboard to achieve precise control. The control valve 2 usually adopts a solenoid valve.

[0039] The infusion pipe is a pipe system connecting the pump body 1, the control valve 2 and the nozzle 3, and is responsible for transporting the fire extinguishing agent from the pump body 1 to the nozzle 3. The infusion pipe is usually made of corrosion-resistant, high-pressure-resistant and flexible materials, such as stainless steel, rubber or special plastics.

[0040] The nozzle 3 is arranged on the top wall of the box 4 and is the final output end of the fire extinguishing agent spray assembly. The design of the nozzle 3 should take into account factors such as the type of fire extinguishing agent, the spraying range and the spraying effect, and select a suitable nozzle shape, aperture and angle. For example, the nozzle 3 can adopt atomizing nozzles, fan nozzles or cone nozzles to achieve different spraying effects and coverage ranges.

[0041] In an optional embodiment, if Figure 2 As shown, the top of the hollow cone is provided with a through hole 51, and the lithium battery fire extinguishing experimental device further comprises a liquid collecting box 8, and the liquid collected by the hollow cone flows into the liquid collecting box 8 through the through hole 51. The liquid collecting box 8 is located on the bottom wall of the box body 4.

[0042] In the lithium battery fire extinguishing experimental device, in order to effectively collect and process the liquid generated during the fire extinguishing process (such as unevaporated fire extinguishing agent, etc.), a through hole 51 is added to the cone top of the hollow cone. At the same time, a liquid collecting box 8 is introduced as a container for collecting these liquids. The liquid collecting box 8 is usually arranged below the hollow cone to receive the liquid flowing out of the cone top through hole 51. The material of the liquid collecting box 8 should have good corrosion resistance and sealing properties to ensure stability and safety in long-term use.

[0043] During the fire extinguishing experiment, as the fire extinguishing agent is sprayed, part of the fire extinguishing agent may accumulate in the hollow cone. Under the action of gravity, the liquid flows into the liquid collecting box 8 below through the through hole 51 at the top of the cone. The liquid collected by the liquid collecting box 8 can be subsequently processed and analyzed to evaluate the fire extinguishing effect and the combustion characteristics of the lithium battery.

[0044] In an optional embodiment, the support assembly includes a support frame 7 and a gasket 6, the support frame 7 includes a support plate and support legs, the support legs are arranged on the support plate, the gasket 6 is attached to the top of the support plate, the gasket 6 is provided with an installation space, the hollow cone is located in the installation space, the liquid collecting box 8 is located below the support plate, the gasket 6 and the support plate are respectively provided with a first through hole and a second through hole connected to the through hole 51, and the liquid collected by the hollow cone flows into the liquid collecting box 8 through the through hole 51, the first through hole and the second through hole in turn.

[0045] The support frame 7 is composed of a support plate and support legs. The support plate is a solid platform for carrying the hollow cone, the gasket 6 and other components. The support legs are fixed below the support plate to firmly support the support plate inside the box 4. The gasket 6 can be a mica gasket.

[0046] In addition, the gasket 6 is attached to the upper part of the support plate, and its main function is to protect the hollow cone and evenly distribute the heat. The gasket 6 is provided with an installation space, the size and shape of which match the hollow cone to ensure that the hollow cone can be firmly placed in the installation space. The gasket 6 is also provided with a first through hole connected to the through hole 51 at the top of the hollow cone.

[0047] During the fire extinguishing experiment, when the liquid generated by the spraying of the fire extinguishing agent accumulates in the hollow cone, the liquid will flow out through the through hole 51 at the top of the cone under the action of gravity. The outflowing liquid first enters the first through hole on the gasket 6. Then, the liquid flows from the first through hole of the gasket 6 into the second through hole on the support plate. Finally, the liquid flows into the liquid collecting box 8 located below the support plate through the second through hole of the support plate. The liquid collecting box 8 receives and collects the liquid for subsequent processing and analysis.

[0048] In an optional embodiment, the side of the hollow cone away from the cone top is exposed to the installation space. The hollow cone is placed in the installation space on the gasket 6, but the cone bottom is not completely surrounded by the installation space, but part or all of the cone bottom is exposed outside the edge of the gasket 6. In this way, there is no need to worry about interference with the gasket 6 or other components, which facilitates better contact between the liquid medicine and the hollow cone.

[0049] In an optional embodiment, the heating plate 5 is a bottomless hollow quadrangular pyramid; and / or the heating plate 5 is a metal plate.

[0050] The heating plate 5 is a bottomless hollow quadrangular pyramid. In this way, the heating plate 5 has a larger surface area, can distribute heat more evenly, and is conducive to the rise and convection of hot air, thereby more effectively simulating the heating condition of the lithium battery in a fire. An electric heating element (such as a resistance wire, an electric heating tube, etc.) is embedded in each side of the heating plate 5 to generate heat through electric current heating. These heating elements should be evenly distributed to ensure the temperature uniformity of the surface of the heating plate 5.

[0051] In addition, the heating plate 5 is made of a metal plate, such as stainless steel, aluminum alloy or copper. These metal materials have good thermal conductivity and high temperature resistance. In order to accurately control the temperature of the heating plate 5, a temperature sensor and a temperature controller can be provided. By monitoring the real-time temperature of the heating plate 5 and adjusting the power of the heating element according to a preset temperature curve, the heating plate 5 is kept working within a set temperature range, which is convenient for subsequent experiments.

[0052] In an optional embodiment, the height of the hollow cone is 10 cm to 20 cm. For example, the height of the hollow cone is 10 cm, 15 cm, or 20 cm.

[0053] In the lithium battery fire extinguishing test device, the hollow cone is a key component for placing lithium batteries and simulating fire scenes. The height design has an important impact on the accuracy and reliability of the experimental results. Within this height range, the hollow cone can provide a relatively large internal space, which is conducive to the rise and convection of hot air, thereby more realistically simulating the actual fire scene. At the same time, the appropriate height also helps the spray coverage of the fire extinguishing agent, ensuring that the fire extinguishing effect can be fully evaluated.

[0054] The lithium battery fire extinguishing experimental device of the embodiment of the present invention is intended to evaluate the response effects of different fire extinguishing agents to thermal runaway or safety accidents of lithium batteries. Not only the heating efficiency of the hot plate is taken into account, but also the diversity of fire extinguishing agents. By observing the temperature changes and the amount of fire extinguishing agents, the fire extinguishing effects of different fire extinguishing agents can be accurately evaluated. In other words, by optimizing the heating design of the hot plate, efficient and uniform heating of lithium batteries with complex shapes can be ensured; at the same time, through the intelligent spray system, the amount and type of fire extinguishing agent sprayed can be accurately adjusted according to the temperature changes monitored in real time, so as to maximize the accuracy of fire extinguishing effect and safety performance evaluation. It can provide a more reliable and effective experimental means for lithium battery safety evaluation, and help to develop more optimized and safe lithium battery fire extinguishing agents.

[0055] In addition, if Figure 3 As shown, the lithium battery fire extinguishing test method of the embodiment of the present invention includes: S100, heating the hollow cone so that the temperature value of each side of the hollow cone is equal to the target temperature value.

[0056] S200, controlling the spraying state of each set of fire extinguishing agent spraying assembly according to the temperature value of the hollow cone, so that the corresponding fire extinguishing agent spraying assembly can spray the agent on the side of the hollow cone away from the cone top.

[0057] Temperature sensors are installed on each side of the hollow cone to monitor the temperature value of the cone side in real time. These temperature sensors should be connected to the control main board so that the control main board can adjust the spraying state of the fire extinguishing agent spraying assembly according to the temperature data of the heating plate.

[0058] During the heating process, the temperature value of each side of the hollow cone is continuously monitored by the temperature sensor, and the data is transmitted to the control main board so that the temperature value of each side of the hollow cone is the same. The temperature threshold of the heating plate is preset in the control main board. When the temperature of each side reaches or exceeds the threshold, it is considered that the state requiring fire extinguishing has been reached. According to the temperature value of the heating plate, the control main board automatically adjusts the spraying state of the fire extinguishing agent spray assembly. During the experiment, the spraying effect of the fire extinguishing agent is closely observed. Record parameters such as the time when the fire extinguishing agent starts spraying, the spraying amount, and the temperature change on each side of the hollow cone. Evaluate the fire extinguishing effect based on the experimental observation results and the recorded data. Analyze the influence of factors such as the type, concentration, and spraying method of the fire extinguishing agent on the fire extinguishing effect, and optimize the experimental parameters to improve the efficiency and safety of fire extinguishing.

[0059] In this way, the lithium battery fire extinguishing experimental method can effectively simulate the combustion of lithium batteries in a fire, and intelligently control the spraying state of the fire extinguishing agent spray assembly according to the temperature value of the hollow cone, thereby achieving efficient and accurate fire extinguishing effect evaluation.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery fire extinguishing test device, characterized in that: include: Box, heating plate, support assembly and at least two sets of fire extinguishing agent spray assemblies; The heating plate is horizontally fixedly installed in the box body through the supporting assembly, and the at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the heating plate; Among them, the heating plate is a bottomless hollow cone, the inner side of the hollow cone faces the top wall of the box, the top of the hollow cone is connected to the support assembly, and the difference between the specific heat capacity of the heating plate and the specific heat capacity of the lithium battery is equal to the target difference.

2. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The lithium battery fire extinguishing test device also includes a temperature measuring component, and there are multiple temperature measuring components, and at least one temperature measuring component is arranged on each side of the hollow cone.

3. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The lithium battery fire extinguishing experimental device also includes a control mainboard, and the heating plate and the fire extinguishing agent spray assembly are electrically connected to the control mainboard. The control mainboard is configured to control the working state of the heating plate, make the temperature value of each side of the hollow cone the same, and control the spraying state of each set of the fire extinguishing agent spray assembly according to the temperature value of the heating plate.

4. The lithium battery fire extinguishing test device according to claim 1, characterized in that: Each set of the fire extinguishing agent spray assembly includes a pump body, a nozzle, a control valve and an infusion tube. The nozzle is arranged in the box body, and the nozzle faces the side of the hollow cone away from the cone top. The pump body, the control valve and the nozzle are arranged in sequence on the infusion tube along the length direction of the infusion tube.

5. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The cone top of the hollow cone is provided with a through hole, and the lithium battery fire extinguishing experimental device also includes a liquid collecting box, and the liquid collected by the hollow cone flows into the liquid collecting box through the through hole.

6. The lithium battery fire extinguishing test device according to claim 5, characterized in that: The support assembly includes a support frame and a gasket, the support frame includes a support plate and support legs, the support legs are arranged on the support plate, the gasket is attached to the top of the support plate, the gasket is provided with an installation space, the hollow cone is located in the installation space, the liquid collecting box is located below the support plate, the gasket and the support plate are respectively provided with a first through hole and a second through hole connected to the through hole, and the liquid collected by the hollow cone flows into the liquid collecting box through the through hole, the first through hole and the second through hole in sequence.

7. The lithium battery fire extinguishing test device according to claim 6, characterized in that: A side of the hollow cone away from the cone top is exposed to the installation space.

8. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The heating plate is a bottomless hollow quadrangular pyramid; and / or, The heating plate is a metal plate.

9. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The height of the hollow cone is 10 cm to 20 cm.

10. A lithium battery fire extinguishing test method for the lithium battery fire extinguishing test device according to any one of claims 1 to 9, characterized in that: include: Heating the hollow cone so that the temperature value of each side of the hollow cone is equal to the target temperature value; According to the temperature value of the hollow cone, the spraying state of each set of the fire extinguishing agent spraying assembly is controlled so that the corresponding fire extinguishing agent spraying assembly can spray the agent on the side of the hollow cone away from the cone top.

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