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 mounting assembly and at least two sets of fire extinguishing agent spraying assemblies; the heating plate is vertically and fixedly installed in the box body through an installation assembly, 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, the heating plate is a bottomless hollow rectangular pyramid, and the inner side face of the rectangular pyramid faces the side wall of the box body; the at least two sets of fire extinguishing agent spraying assemblies are configured to spray different agents to the inner side face of the rectangular pyramid. Therefore, the inhibition effect of different fire extinguishing agents on the lithium battery fire can be analyzed, and reference is provided for practical application. 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 mounting assembly, and at least two sets of fire extinguishing agent spraying assemblies; The heating plate is vertically fixed in the box through the mounting assembly, 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, the heating plate is a bottomless hollow quadrangular pyramid, and the inner side of the quadrangular pyramid faces the side wall of the box; wherein the at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the inner side of the quadrangular pyramid.

[0005] According to a lithium battery fire extinguishing test device provided by the present invention, the installation assembly includes a gasket, an abutment plate and a fixing plate, the gasket is provided with a accommodating space adapted to the quadrangular pyramid, part of the quadrangular pyramid is arranged in the accommodating space, the fixing plate is sleeved on the outer side surface of the quadrangular pyramid, and the side of the gasket facing away from the fixing plate is connected to the abutment plate.

[0006] According to a lithium battery fire extinguishing test device provided by the present invention, the abutment plate and the fixing plate are arranged in parallel.

[0007] According to a lithium battery fire extinguishing test device provided by the present invention, the installation assembly also includes a support frame, the support frame is arranged in the box body, and the abutment plate and the fixing plate are connected to the support frame so that the quadrangular pyramid is suspended in the box body.

[0008] According to a lithium battery fire extinguishing test device provided by the present invention, the lithium battery fire extinguishing test device also includes a liquid collecting box, which is arranged below the quadrangular pyramid so that the liquid collected by the quadrangular pyramid can flow into the liquid collecting box.

[0009] According to a lithium battery fire extinguishing test device provided by the present invention, the support frame includes a first support frame and a second support frame which are spaced apart from each other, and the abutment plate and the fixing plate are installed between the first support frame and the second support frame.

[0010] 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 each side of the quadrangular pyramid is provided with at least one temperature measuring component.

[0011] 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 quadrangular pyramid 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.

[0012] 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 on the side wall of the box body, the nozzle faces the inner side of the quadrangular pyramid, and 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.

[0013] In a second aspect, the present invention further provides a lithium battery fire extinguishing test method, comprising: Heating the quadrangular pyramid so that the temperature value of each side of the quadrangular pyramid is equal to the target temperature value; According to the temperature value of the quadrangular pyramid, 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 inner side surface of the quadrangular pyramid.

[0014] 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 temperature value of the heating plate 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) 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

[0015] 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.

[0016] Figure 1 It is a structural schematic diagram of the lithium battery fire extinguishing experimental device provided by the present invention.

[0017] Figure 2 It is a structural schematic diagram of the heating plate provided by the present invention.

[0018] Figure 3 It is a flow chart of the lithium battery fire extinguishing test method provided by the present invention.

[0019] Reference numerals: 1. Pump body; 2. Control valve; 3. Box body; 4. Nozzle; 5. Fixing plate; 6. Heating plate; 7. Gasket; 8. Support frame; 9. Liquid collecting box; 10. Abutment plate. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1 and Figure 2 As shown, the lithium battery fire extinguishing test device according to the embodiment of the present invention comprises: a box body 3, a heating plate 6, a mounting assembly and at least two sets of fire extinguishing agent spraying assemblies.

[0022] The heating plate 6 is vertically fixed in the box body 3 through an installation assembly. The difference between the specific heat capacity of the heating plate 6 and the specific heat capacity of the lithium battery is equal to the target difference. The heating plate 6 is a bottomless hollow quadrangular pyramid, and the inner side of the quadrangular pyramid faces the side wall of the box body 3; wherein at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the inner side of the quadrangular pyramid.

[0023] Wherein, each set of fire extinguishing agent spraying assembly can work simultaneously, or work in sequence in the order of installation. The heating plate 6 is a bottomless hollow tetrahedron, the inner side of the tetrahedron faces the side wall of the box body 3, and the difference between the specific heat capacity of the heating plate 6 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, less than or equal to 0.5. In other words, the specific heat capacity of the heating plate 6 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 spraying assemblies are respectively configured to spray different agents on the inner side of the tetrahedron.

[0024] It should be noted that the vertical setting of the tetrahedron can reduce the interference of the spraying water mist on the experimental results, so that the spraying water mist falls to the ground quickly before contacting the tetrahedron, and the application of the fire extinguishing agent is more concentrated and more impactful, thereby accurately collecting the actual effect of the agent in the fire extinguishing process.

[0025] It should be noted that the box 3 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 3 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 3 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 3 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 6 is in the shape of a bottomless hollow quadrangular pyramid, which can effectively control the flow and collection of the spray agent, ensuring the stability and safety of the experiment. The shape of the heating plate 6 is customized to the size of the lithium battery in a 1:1 ratio to ensure that the surface of the lithium battery can be completely covered, improve the heating efficiency and uniformity, and thus ensure 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 6, and the heating temperature is adjusted by an external controller. Exemplarily, the heating plate 6 is provided with an electric heating element, or each side of the heating plate 6 is provided with an electric heating element.

[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 tetrahedron.

[0028] In the embodiment of the present invention, the heating plate 6 is started to simulate the overheating or fire state of the lithium battery. When the temperature value of the heating plate 6 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 6) is observed and recorded. In this way, the inhibitory effect of different fire extinguishing agents on lithium battery fires can be analyzed to provide a reference for practical application. 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] like Figure 1 and Figure 2 As shown, the mounting assembly includes a gasket 7, and the gasket 7 is provided with a receiving space adapted to the quadrangular pyramid, and part of the quadrangular pyramid is arranged in the receiving space.

[0030] It should be noted that, compared with the irregular shape of the tetrahedron, a receiving space adapted to the tetrahedron can be provided on the rectangular gasket 7 body, and the tetrahedron can be installed in the receiving space, so that the installation of the tetrahedron can be realized with the help of the gasket 7. The top of the tetrahedron is located in the receiving space, and the side opposite to the top of the tetrahedron is located outside the receiving space, so that the fire extinguishing agent spraying assembly can spray the inner side of the tetrahedron. The gasket 7 can be a mica gasket 7.

[0031] In addition, the mounting assembly further comprises an abutment plate 10 and a fixing plate 5, wherein the fixing plate 5 is sleeved on the outer side of the quadrangular pyramid, and the side of the gasket 7 facing away from the fixing plate 5 is connected to the abutment plate 10. The abutment plate 10 and the fixing plate 5 may be heat-insulating plates.

[0032] It should be noted that the fixing plate 5 is provided with a mounting hole, the shape of the mounting hole is adapted to the contour shape of the tetrahedron, so that a stable connection between the fixing plate 5 and the tetrahedron can be achieved, and, with the aid of the connection between the abutment plate 10 and the gasket 7, under the joint action of the fixing plate 5 and the abutment plate 10, the tetrahedron can be more stably arranged in the box body 3.

[0033] like Figure 1 and Figure 2 As shown, the abutment plate 10 and the fixing plate 5 are arranged in parallel, and are arranged in parallel with the plane where the fixing plate 5 and the side wall of the box body 3 are located. When the nozzle 4 of the fire extinguishing agent spray assembly is arranged on the side wall of the box body 3, it can ensure that the liquid sprayed by the nozzle 4 can be evenly sprayed onto the four inner sides of the quadrangular pyramid.

[0034] like Figure 1 and Figure 2 As shown, the mounting assembly further includes a support frame 8 , which is disposed in the box body 3 , and the abutment plate 10 and the fixing plate 5 are connected to the support frame 8 , so that the quadrangular pyramid is suspended in the box body 3 .

[0035] It should be noted that a support frame 8 is provided inside the box 3, and the abutment plate 10 and the fixing plate 5 can be connected to the support frame 8 at the same time, so that the position of the tetrahedron can be kept stable, and with the help of the support frame 8, the tetrahedron can be placed in the target position, which is convenient for subsequent experimental operations.

[0036] like Figure 1 and Figure 2 As shown, the lithium battery fire extinguishing test device further includes a liquid collecting box 9, which is arranged below the quadrangular pyramid so that the liquid collected by the quadrangular pyramid can flow into the liquid collecting box 9. In other words, in the lithium battery fire extinguishing test device, in order to effectively collect and process the liquid (such as unevaporated fire extinguishing agent, etc.) generated during the fire extinguishing process, the liquid collecting box 9 is introduced as a container for collecting these liquids.

[0037] The liquid collecting box 9 is usually arranged below the quadrangular pyramid to receive the liquid flowing out from the inner side of the quadrangular pyramid. The material of the liquid collecting box 9 should have good corrosion resistance and sealing properties to ensure stability and safety for long-term use. The liquid collecting box 9 can be arranged on the bottom wall of the box body 3.

[0038] During the fire extinguishing experiment, as the fire extinguishing agent is sprayed, part of the fire extinguishing agent may accumulate in the tetrahedral pyramid. These liquids flow into the liquid collecting box 9 below under the action of gravity. The liquid collected by the liquid collecting box 9 can be subsequently processed and analyzed to evaluate the fire extinguishing effect and the combustion characteristics of the lithium battery.

[0039] like Figure 1 and Figure 2 As shown, the support frame 8 includes a first support frame 8 and a second support frame 8 which are spaced apart from each other, and the abutment plate 10 and the fixing plate 5 are installed between the first support frame 8 and the second support frame 8 .

[0040] It should be noted that the box body 3 has a first side wall and a second side wall relative to each other, one end of the first support frame 8 is located on the first side wall, and the other end of the first support frame 8 is located on the second side wall. Similarly, one end of the second support frame 8 is located on the first side wall, and the other end of the second support frame 8 is located on the second side wall. The first support frame 8 is located above the second support frame 8, the top of the abutment plate 10 and the fixed plate 5 abuts against the first support frame 8, and the bottom of the abutment plate 10 and the fixed plate 5 abuts against the second support frame 8, and the fixed plate 5 is arranged parallel to the plane where the first side wall is located, that is, the inner side surface of the quadrangular pyramid faces the first side surface.

[0041] It should be noted that the position of the quadrangular pyramid between the first support frame 8 and the second support frame 8 can be adjusted according to actual needs. The abutment plate 10 and the fixing plate 5 can be connected and disassembled with the first support frame 8 and the second support frame 8 by means of fixing members.

[0042] 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 quadrangular pyramid. Among them, the temperature measuring component can be a thermocouple. In other words, each side of the quadrangular pyramid is equipped with a thermocouple, which can monitor the temperature change on the surface of the heating plate 6 in real time, and can ensure the consistency of the temperature of each side of the quadrangular pyramid, thereby ensuring the uniformity and stability of the heating plate 6 during the heating process, and improving the accuracy of the experimental data.

[0043] Specifically, the number of temperature measuring parts is determined according to the number of sides of the quadrangular pyramid, ensuring that each side has at least one temperature measuring point. If the sides of the cone are more complex or have a larger area, it is possible to consider setting multiple temperature measuring points on each side to improve the measurement accuracy.

[0044] In an embodiment of the present invention, before the formal experiment, the heating plate 6 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.

[0045] In an optional embodiment, the lithium battery fire extinguishing experimental device also includes a control main board, and the heating plate 6 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 6 so that the temperature value of each side of the tetrahedron 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 6.

[0046] 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.

[0047] 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 RS, CAN bus or Wi-Fi module) for remote monitoring and parameter adjustment. The heating plate 6 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 6 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 6.

[0048] According to the experimental requirements, the target temperature of the heating plate 6 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.

[0049] In an optional embodiment, if Figure 1 As shown, each set of fire extinguishing agent spray assembly includes a pump body 1, a nozzle 4, a control valve 2 and an infusion tube. The nozzle 4 is arranged in the box body 3, and the nozzle 4 faces the inner side of the tetrahedron. For example, the nozzle 4 is arranged on the first side wall, and the pump body 1, the control valve 2 and the nozzle 4 are arranged on the infusion tube in sequence along the length direction of the infusion tube. Among them, the pump body 1 can be a pressure pump, equipped with a pressure pump and a control valve 2, which can 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 4 needs to be able to be evenly sprayed on each inner side of the tetrahedron.

[0050] 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 4 through the 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.

[0051] The control valve 2 is located between the pump body 1 and the nozzle 4, 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 is usually a solenoid valve.

[0052] The infusion pipe is a pipeline system connecting the pump body 1, the control valve 2 and the nozzle 4, and is responsible for transporting the fire extinguishing agent from the pump body 1 to the nozzle 4. The infusion pipe is usually made of corrosion-resistant, high-pressure-resistant and flexible materials, such as stainless steel, rubber or special plastics.

[0053] The nozzle 4 is arranged on the side wall of the box 3 and is the final output end of the fire extinguishing agent spray assembly. The design of the nozzle 4 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 4 can adopt atomizing nozzles, fan nozzles or cone nozzles to achieve different spraying effects and coverage ranges.

[0054] In an optional embodiment, the heating plate 6 is a metal plate.

[0055] The heating plate 6 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 6, a temperature sensor and a temperature controller can be provided. By monitoring the real-time temperature of the heating plate 6 and adjusting the power of the heating element according to a preset temperature curve, the heating plate 6 is kept working within a set temperature range, which is convenient for subsequent experiments.

[0056] In an optional embodiment, the height of the quadrangular pyramid is 5 cm to 10 cm. For example, the height of the quadrangular pyramid is 5 cm, 7 cm, or 10 cm.

[0057] In the lithium battery fire extinguishing test device, the tetrahedron is a key component for simulating fire scenes, and its height design has an important impact on the accuracy and reliability of the experimental results. Within this height range, the tetrahedron 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.

[0058] 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.

[0059] 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 tetrahedron so that the temperature value of each side of the tetrahedron is equal to the target temperature value; S200, controlling the spraying state of each set of fire extinguishing agent spraying components according to the temperature value of the quadrangular pyramid, so that the corresponding fire extinguishing agent spraying components can spray the agent on the inner side surface of the quadrangular pyramid.

[0060] Temperature sensors are installed on each side of the quadrangular pyramid 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 adjusts the spraying state of the fire extinguishing agent spray assembly according to the temperature data of the heating plate 6.

[0061] During the heating process, the temperature value of each side of the tetrahedron 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 tetrahedron is the same. The temperature threshold of the heating plate 6 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 6, 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 of each side of the tetrahedron. 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.

[0062] 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 tetrahedron, thereby achieving efficient and accurate fire extinguishing effect evaluation.

[0063] 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, mounting assembly and at least two sets of fire extinguishing agent spray assemblies; The heating plate is vertically fixed in the box through the mounting assembly, 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, the heating plate is a bottomless hollow quadrangular pyramid, and the inner side of the quadrangular pyramid faces the side wall of the box; wherein the at least two sets of fire extinguishing agent spraying assemblies are respectively configured to spray different agents on the inner side of the quadrangular pyramid.

2. The lithium battery fire extinguishing test device according to claim 1, characterized in that: The mounting assembly includes a gasket, an abutment plate and a fixing plate. The gasket is provided with a receiving space adapted to the quadrangular pyramid. Part of the quadrangular pyramid is arranged in the receiving space. The fixing plate is sleeved on the outer side surface of the quadrangular pyramid. The side of the gasket facing away from the fixing plate is connected to the abutment plate.

3. The lithium battery fire extinguishing test device according to claim 2, characterized in that: The abutting plate and the fixing plate are arranged in parallel.

4. The lithium battery fire extinguishing test device according to claim 2, characterized in that: The mounting assembly further comprises a support frame, wherein the support frame is disposed in the box body, and the abutment plate and the fixing plate are connected to the support frame so that the quadrangular pyramid is suspended in the box body.

5. The lithium battery fire extinguishing test device according to claim 4, characterized in that: The lithium battery fire extinguishing test device further comprises a liquid collecting box, which is arranged below the quadrangular pyramid so that the liquid collected by the quadrangular pyramid can flow into the liquid collecting box.

6. The lithium battery fire extinguishing test device according to claim 4, characterized in that: The support frame includes a first support frame and a second support frame which are spaced apart from each other, and the abutment plate and the fixing plate are installed between the first support frame and the second support frame.

7. 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 quadrangular pyramid.

8. 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 quadrangular pyramid 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.

9. 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 on the side wall of the box body, and the nozzle faces the inner side of the quadrangular pyramid. 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.

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 quadrangular pyramid so that the temperature value of each side of the quadrangular pyramid is equal to the target temperature value; According to the temperature value of the quadrangular pyramid, 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 inner side surface of the quadrangular pyramid.

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