A method and platform for fire suppression microcapsule fire suppression testing

Abstract

The application discloses a fire extinguishing microcapsule fire suppression test method and platform, and belongs to the technical field of fire extinguishing materials. The technical problem to be solved is that the prior art lacks an effective and accurate evaluation of the fire suppression capability of fire extinguishing microcapsules. The technical solution is as follows: a lithium battery is caused to be in thermal runaway by means of an external heating piece heating the surface of the lithium battery; the total heat accumulation of the lithium battery during thermal runaway is calculated according to the temperature and mass of the lithium battery; the heat absorption rate of the microcapsule fire extinguishing sheet during thermal runaway is calculated; the proportion coefficient of the battery refrigeration capacity is calculated according to the radius of the lithium battery and the distance between the lithium battery and the microcapsule fire extinguishing sheet; the maximum cooling capacity of a single lithium battery under the action of the microcapsule fire extinguishing sheet is calculated; and the fire suppression effect of the microcapsule fire extinguishing sheet on the lithium battery is evaluated according to the total heat accumulation of the lithium battery during thermal runaway and the maximum cooling capacity of a single lithium battery.

Description

Technical Field

[0001] This invention relates to the field of fire suppression technology, specifically to a fire suppression testing method and platform for fire extinguishing microcapsules. Background Technology

[0002] With the rapid development of new energy equipment, precision power distribution devices, and enclosed industrial control spaces, traditional fire extinguishing materials are no longer suitable for the fire prevention and control needs of small, enclosed, and high-precision equipment scenarios due to their defects such as rapid agent consumption, poor targeting, easy damage to precision equipment, and high reignition rate.

[0003] Fire extinguishing microcapsules, as a new type of intelligent fire extinguishing material, have been widely used in special fire protection scenarios such as electrical cabinets, energy storage battery compartments, underground pipe corridors, and precision instrument compartments due to their outstanding advantages of small particle size, strong sealing, temperature-sensitive triggering, targeted drug release, no pollution, and pre-laid integration. They have become the core research direction of passive active fire protection technology at present.

[0004] The core working principle of fire extinguishing microcapsules is to encapsulate liquid, gaseous or powdered fire extinguishing agents in the wall material, which remains stable and inert under normal conditions. When the ambient temperature reaches the fire triggering threshold, the wall material melts, cracks or degrades, and quickly releases the internal fire extinguishing agent, thereby achieving rapid suppression and extinguishing of early fires. It has the technical advantages of early warning, precise fire extinguishing and efficient flame retardancy.

[0005] In the iterative development and engineering application of fire extinguishing microcapsule technology, accurate evaluation of its fire suppression capability is the core foundation for optimizing material formulations, adjusting structural parameters, matching application scenarios, and ensuring fire protection reliability. However, the industry has not yet formed a targeted and standardized fire suppression testing system for fire extinguishing microcapsules. Existing fire extinguishing performance testing methods mostly follow the general testing standards and test schemes of traditional fire extinguishing agents and block fire extinguishing materials, which have obvious technical adaptability defects and cannot achieve accurate and quantitative evaluation of the fire suppression capability of fire extinguishing microcapsules.

[0006] The shortcomings of existing testing technologies are mainly reflected in the following aspects: Traditional testing methods often focus on the qualitative assessment of macroscopic fire extinguishing results, simply recording basic surface data such as whether the fire was successfully extinguished and the duration of extinguishing. They lack quantitative detection of core performance parameters such as microcapsule trigger response temperature and agent release rate, and therefore cannot accurately characterize the true fire suppression mechanism and comprehensive effectiveness of microcapsules.

[0007] Currently, most commonly used fire testing methods are designed for traditional solid and gas fires, and can only achieve simple observation of macroscopic open flame extinguishing effects. They cannot adapt to the special combustion mechanism of lithium battery electrochemical fires, and it is difficult to accurately characterize the suppression effect, cooling performance, reignition prevention capability and trigger response characteristics of fire extinguishing microcapsules on lithium battery thermal runaway.

[0008] In summary, the industry currently lacks a specific testing method for fire suppression capabilities that is compatible with the characteristics of fire extinguishing microcapsules, has a high degree of fit with operating conditions, comprehensive parameter detection, accurate and reliable data, and standardized procedures. This makes it impossible to achieve a scientific and accurate evaluation of the fire suppression performance of fire extinguishing microcapsules, which greatly limits the technological upgrading, quality control, and large-scale engineering application of fire extinguishing microcapsule products.

[0009] Therefore, there is an urgent need to develop a targeted fire suppression testing method for fire extinguishing microcapsules to address the aforementioned technical deficiencies in existing technologies. Summary of the Invention

[0010] The purpose of this invention is to provide a fire suppression testing method for fire extinguishing microcapsules, in order to solve the technical problem that the existing technology lacks an accurate evaluation of the fire suppression capability of fire extinguishing microcapsules.

[0011] In a first aspect, the present invention provides a fire suppression testing method for fire extinguishing microcapsules, comprising the following steps: A1. Fix the lithium battery to the battery bracket, attach heating pads to the surface of the lithium battery and install thermocouples; install the microcapsule fire extinguishing pads above the lithium battery; put the microcapsule fire extinguishing pads and the lithium battery into an explosion-proof glass box, and arrange smoke detectors, cameras and thermal imagers outside the explosion-proof glass box. A2. Thermal runaway is induced in the lithium battery by externally heating the heating element on its surface. When the temperature above the lithium battery reaches the melting temperature of the microcapsule fire extinguishing plate wall material, the microcapsule fire extinguishing plate begins to work; the temperature and mass of the lithium battery are obtained; the temperature and mass of the microcapsule fire extinguishing plate are obtained. A3. Calculate the total heat accumulation of the lithium battery during thermal runaway based on the temperature and mass of the lithium battery. A4. When a lithium battery experiences thermal runaway, the microcapsule fire extinguishing tablet releases the fire extinguishing agent, absorbs heat, and evaporates. Calculate the heat absorption rate of the microcapsule fire extinguishing tablet during thermal runaway. A5. Calculate the proportional coefficient of the battery's cooling capacity based on the radius of the lithium battery and the distance between the lithium battery and the microcapsule fire extinguishing plate. A6. Using the heat absorption rate and the proportional coefficient of the cooling capacity of lithium batteries, calculate the maximum cooling capacity of a single lithium battery under the action of microcapsule fire extinguishing. A7. Evaluate the fire suppression effect of capsule fire extinguishing tablets on lithium battery fires based on the total heat accumulation of the lithium battery during thermal runaway and the maximum cooling capacity of a single lithium battery.

[0012] Furthermore, in step A3, the total heat accumulation of the lithium battery during thermal runaway is calculated based on the temperature and mass of the lithium battery: (1); Total heat accumulation It refers to the specific heat capacity of a lithium battery. It's about the quality of the lithium battery. That is the maximum temperature of a lithium battery. It refers to the ambient temperature.

[0013] Further, in step A4, the heat absorption rate of the extinguishing capsule during thermal runaway is calculated: (2); Heat absorption rate : Temperature of the microcapsule fire extinguishing tablets; It is the specific heat capacity of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the evaporation temperature of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the ambient temperature. It refers to the quality of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules; Latent heat of vaporization The mass of the fire extinguishing agent encapsulated in the fire extinguishing microcapsule that has undergone a phase change.

[0014] Further, in step A5, the proportional coefficient of the cooling capacity of the thermal lithium battery is calculated. : (3).

[0015] Furthermore, in step A6, the maximum cooling capacity of a single lithium battery. It can be obtained from the following formula: (4).

[0016] Furthermore, in step A7, when the maximum cooling capacity is greater than the total heat accumulation, it indicates that the fire extinguishing microcapsule has a good fire suppression capability; conversely, it indicates that its cooling capacity is insufficient and it is difficult to effectively suppress the thermal runaway of lithium batteries and the development of fire.

[0017] Secondly, the present invention provides a fire suppression testing platform for fire extinguishing microcapsules, serving as a platform for the aforementioned fire suppression testing method for fire extinguishing microcapsules. The fire suppression testing platform for fire extinguishing microcapsules includes: Lithium batteries, microcapsule fire extinguishing pads, explosion-proof glass boxes, heating elements, thermocouples, battery holders, and balances. The explosion-proof glass case is equipped with a mass balance, lithium battery, heating element and thermocouple, and microcapsule fire extinguishing tablets. The balance contains lithium batteries placed on a battery holder. Heating elements and thermocouples are mounted on the surface of the lithium batteries, and microcapsule fire extinguishing pads are mounted above the lithium batteries. The explosion-proof glass enclosure is equipped with a voltage source, data acquisition device, smoke detector, computer, camera, and thermal imager.

[0018] Furthermore, the smoke detector collects real-time data on the concentration of smoke and combustible gases around the explosion-proof glass enclosure; the camera continuously collects visible light video images inside the explosion-proof glass enclosure; the thermal imager simultaneously collects temperature distribution data of the target inside the explosion-proof glass enclosure; and the data acquisition unit simultaneously receives data from the smoke detector, image signals from the camera and thermal imager, performs data filtering and preprocessing, and then transmits the data to the computer.

[0019] Furthermore, it also includes a microcapsule fire extinguishing bracket fixed inside an explosion-proof glass case, with the microcapsule fire extinguishing pads fixed above the lithium battery via the microcapsule fire extinguishing bracket.

[0020] Furthermore, it also includes explosion-proof glass brackets for supporting the explosion-proof glass enclosure.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: The fire suppression test method for fire extinguishing microcapsules evaluates the fire suppression effect of the capsule fire extinguishing tablets on lithium battery fires based on the total heat accumulation of the lithium battery during thermal runaway and the maximum cooling capacity of a single lithium battery. When the maximum cooling capacity is greater than the total heat accumulation, it indicates that the fire extinguishing microcapsule has a good fire suppression capability; conversely, it indicates that its cooling capacity is insufficient and it is difficult to effectively suppress the thermal runaway of lithium batteries and the development of fires. This invention achieves an accurate evaluation of the fire suppression capability of fire extinguishing microcapsules.

[0022] Quantitative and standardized fire suppression microcapsule fire suppression effect test: Based on a fire suppression testing platform using fire extinguishing microcapsules, parameters such as temperature, smoke concentration, flame height, and fire spread time can be obtained. The fire extinguishing performance of the fire extinguishing capsules can be evaluated based on the changes in parameters or indicators before and after adding fire extinguishing microcapsules, thereby improving production efficiency and meeting the needs for effective prevention and suppression of lithium battery fires in scenarios such as new energy vehicles and energy storage power stations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the fire suppression test platform for fire extinguishing microcapsules of the present invention.

[0024] Figure 2 This is a flowchart of the fire suppression test method for fire extinguishing microcapsules of the present invention.

[0025] Figure label: 1. Lithium battery; 2. Microcapsule fire extinguishing tablet; 3. Explosion-proof glass box; 4. Microcapsule fire extinguishing bracket; 5. Heating element; 6. Thermocouple; 7. Battery bracket; 8. Mass balance; 9. Explosion-proof glass bracket; 10. Voltage source; 11. Data acquisition device; 12. Smoke detector; 13. Computer; 14. Table; 15. Camera; 16. Thermal imager. Detailed Implementation

[0026] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way. The following content is merely an exemplary description of the scope of protection claimed by the present invention, and those skilled in the art can make various changes and modifications to the present invention based on the disclosed content, and such changes should also fall within the scope of protection claimed by the present invention.

[0027] like Figure 1 As shown, a fire suppression test platform for fire extinguishing microcapsules is constructed, including a lithium battery 1, a microcapsule fire extinguishing pad 2, an explosion-proof glass box 3, a microcapsule fire extinguishing bracket 4, a heating pad 5, a thermocouple 6, a battery bracket 7, a mass balance 8, an explosion-proof glass bracket 9, a voltage source 10, a data acquisition device 11, a smoke detector 12, a computer 13, a camera 15, a table 14, and a thermal imager 16. The explosion-proof glass box 3 is equipped with a mass balance 8, a lithium battery 1, a heating element 5 and a thermocouple 6, and a microcapsule fire extinguishing plate 2. The lithium battery 1 is placed on the mass balance 8 through a battery bracket 7. The heating element 5 and the thermocouple 6 are provided on the surface of the lithium battery 1. The microcapsule fire extinguishing plate 2 is placed above the lithium battery 1 and is fixed above the lithium battery 1 by a microcapsule fire extinguishing bracket 4. The explosion-proof glass enclosure 3 is equipped with a smoke detector 12, a camera 15 and a thermal imager 16.

[0028] The sides of the explosion-proof glass box 3 are open and without glass; this allows fire extinguishing tests to be conducted inside the explosion-proof glass box, where the box is depressurized and the smoke detector senses the internal gas.

[0029] The explosion-proof glass box 3 is mounted on the explosion-proof glass bracket 9.

[0030] Microcapsule fire extinguishing tablet 2 is made by mixing a certain amount of fire extinguishing microcapsules with glue and then applying it to fireproof felt.

[0031] The table 14 is equipped with a voltage source 10, a data acquisition device 11, a smoke detector 12, and a computer 13.

[0032] Voltage source 10 provides power to heating element 5, thermocouple 6, data acquisition unit 11, flue gas detector 12, computer 13, camera 15, and thermal imager 16.

[0033] The smoke detector 12 collects real-time data on the concentration of smoke and combustible gases around the explosion-proof glass box 3, and actively outputs an alarm signal when the value exceeds the threshold.

[0034] Camera 15 continuously captures visible light video images inside the explosion-proof glass box 3, while thermal imager 16 simultaneously captures temperature distribution data of the target inside the explosion-proof glass box 3. Both types of image data are output simultaneously.

[0035] The data acquisition unit 11 synchronously receives data from the smoke detector 12, image signals from the camera 15 and the thermal imager 16, performs data filtering and preprocessing, and then transmits the data to the computer 13 via wired or GPRS wireless means.

[0036] Computer 13 analyzes all received data in real time: it can display real-time curves of flue gas concentration and temperature, and also simultaneously play back visible light and thermal imaging images.

[0037] Using the aforementioned fire suppression test platform for fire extinguishing microcapsules, a method for suppressing thermal runaway of lithium batteries was implemented to test the fire suppression effectiveness of the microcapsule fire extinguishing tablet 2 on the lithium battery 1.

[0038] The experimental conditions for the test are shown in Table 1: Table 1

[0039] This embodiment of a fire-extinguishing microcapsule method for suppressing thermal runaway in lithium batteries includes the following steps: 1) Before and after the experiment, lithium battery 1 was weighed separately. Microcapsule fire extinguishing tablet 2 was suspended above the battery and weighed separately before and after the experiment, and the weight was recorded.

[0040] Secure the lithium battery 1 to the battery holder 7, attach the heating element 5 to its surface, and install the thermocouple 6. Then, start all sensors and the data acquisition unit 11 to test the effectiveness of each sensor. If any abnormality is found in the thermocouple 6, the flue gas detector 12, the heating element 5, or the camera 15, they must be replaced immediately.

[0041] 2) To investigate the extinguishing effect of the microcapsule fire extinguishing pad 2 on the fire of the lithium battery 1, the microcapsule fire extinguishing pad 2 was installed above the lithium battery 1 and fixed by the battery bracket 7. The lithium battery 1 and the microcapsule fire extinguishing pad 2 were placed together in an explosion-proof glass box 3 with an explosion-proof glass bracket 9, and a smoke detector 12, a camera 15, and a thermal imager 16 were also arranged. High-temperature resistant tape was used to wrap the sensor devices and their signal transmission lines close to the lithium battery 1.

[0042] 3) Thermal runaway of lithium battery 1 is induced by external heating of lithium battery 1. The experimenter needs to closely monitor the battery status, including but not limited to temperature changes, smoke generation, flame height and spread trend, etc. When the temperature above lithium battery 1 measured by thermal imager 16 reaches the melting temperature of the wall material of microcapsule fire extinguishing plate 2 (130°C), microcapsule fire extinguishing plate 2 starts to work.

[0043] During this process, the experimenters recorded data on the test bench and recorded key nodes in the experiment, such as the start time of thermal runaway of lithium battery 1, the start time of working of microcapsule fire extinguishing tablet 2, and the turning point of fire change, in order to accurately evaluate the response speed and fire extinguishing effect of microcapsule fire extinguishing tablet 2.

[0044] Thermal imager 16 acquires the temperature of lithium battery 1, and mass balance 8 acquires the mass of lithium battery 1; and thermal imager 16 acquires the temperature of microcapsule fire extinguishing tablet 2, and mass balance 8 acquires the mass of microcapsule fire extinguishing tablet 2. Based on the temperature and mass of lithium battery 1, the total heat accumulation of lithium battery 1 during thermal runaway can be calculated using equation (1): (1) Total heat accumulation It is the specific heat capacity of lithium battery 1. It is the mass of lithium battery 1. That is the maximum temperature of lithium battery 1. It refers to the ambient temperature.

[0045] When lithium battery 1 experiences thermal runaway, the microcapsule fire extinguishing tablet 2 releases the fire extinguishing agent, absorbs heat, and evaporates. The heat absorption rate of the microcapsule fire extinguishing tablet 2 throughout the process is [not specified]. It can be calculated using the following formula (2).

[0046] (2) Heat absorption rate : Temperature of the microcapsule fire extinguishing tablet 2; It is the specific heat capacity of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the evaporation temperature of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the ambient temperature. It refers to the quality of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. Latent heat of vaporization The mass of the fire extinguishing agent encapsulated in the fire extinguishing microcapsule that has undergone a phase change.

[0047] The mass of the extinguishing agent encapsulated in the extinguishing microcapsule that undergoes a phase change is equal to the weight difference of the extinguishing microcapsule tablets before and after the experiment.

[0048] The latent heat of vaporization is equal to the heat absorbed when the extinguishing agent encapsulated in a unit mass of fire extinguishing microcapsule completely vaporizes at the evaporation temperature.

[0049] The proportionality coefficient of battery cooling capacity is defined as a dimensionless coefficient used to quantify the degree to which the cooling capacity of the microcapsule fire extinguishing plate 2 decreases with increasing distance from the lithium battery 1. It can be obtained from the following formula (3): (3); It is the radius of lithium battery 1. It is the distance between lithium battery 1 and microcapsule fire extinguishing plate 2. This is an experimental constant, which can be determined by distance. The peak temperature of thermal runaway of lithium battery 1 in the blank group and the peak temperature of thermal runaway of lithium battery 1 after adding microcapsule fire extinguishing tablet 2 were obtained by fitting three parameters.

[0050] Maximum cooling capacity of a single lithium battery 1 It can be obtained from the following formula (4): (4); 4) After the experiment, allow the site to stand still for 1 hour to stabilize the experimental environment and reduce residual risks. After the settling time, professional firefighters will enter the site to check whether lithium battery 1 has completely burned out and will carry out safety procedures according to professional protocols to ensure the safety of the experimental site. At the same time, the experimental site and lithium battery 1 will be thoroughly cleaned to restore the experimental environment to cleanliness and safety, preparing for subsequent experiments.

[0051] 5) The collected experimental data were systematically organized and analyzed, with a focus on comparing the development of the fire in lithium battery 1 before and after the installation of microcapsule fire extinguishing pad 2, including key indicators such as temperature change curves, smoke generation, flame height and spread speed, in order to quantitatively evaluate the fire extinguishing effect of microcapsule fire extinguishing pad 2.

[0052] 6) By adjusting parameters such as the installation position, quantity, or melting temperature of the wall material of the microcapsule fire extinguishing pads 2, repeat steps 1) to 5) to determine the fire suppression effect of the lithium battery 1 under different microcapsule fire extinguishing pad settings.

[0053] This method evaluates the fire suppression effect of microcapsule fire extinguishing pad 2 on lithium battery 1 fire through heat matching relationship. First, based on the temperature and mass changes during the thermal runaway process of lithium battery 1, the total heat accumulation of lithium battery 1 during thermal runaway is calculated. Second, based on the heat absorption during the temperature rise of the fire extinguishing agent, the latent heat of vaporization, and the amount of fire extinguishing agent used, the heat absorption capacity after the release of the fire extinguishing microcapsule is calculated. Furthermore, considering the cooling attenuation caused by the distance between the microcapsule fire extinguishing pad 2 and lithium battery 1, the maximum cooling capacity acting on a single lithium battery 1 is obtained.

[0054] By comparing the maximum cooling capacity of a single lithium battery 1 with the total heat accumulation during thermal runaway of lithium battery 1, it can be determined whether the microcapsule fire extinguishing pad 2 can effectively cover the thermal runaway heat load of lithium battery 1. When the maximum cooling capacity is greater than the total heat accumulation, it indicates that the microcapsule fire extinguishing pad 2 has a good fire suppression capability; otherwise, it indicates that its cooling capacity is insufficient and it is difficult to effectively suppress the thermal runaway of lithium battery 1 and the development of fire.

[0055] The experimental results can provide more scientific and effective technical support for the practical application of microcapsule fire extinguishing tablets 2 in the field of lithium battery fire suppression 1.

[0056] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A fire suppression test method for fire extinguishing microcapsules, characterized in that, Includes the following steps: A1. Fix the lithium battery to the battery bracket, attach heating pads to the surface of the lithium battery and install thermocouples; install the microcapsule fire extinguishing pads above the lithium battery; put the microcapsule fire extinguishing pads and the lithium battery into an explosion-proof glass box, and arrange smoke detectors, cameras and thermal imagers outside the explosion-proof glass box. A2. Thermal runaway is induced in the lithium battery by externally heating the heating element on its surface. When the temperature above the lithium battery reaches the melting temperature of the microcapsule fire extinguishing plate wall material, the microcapsule fire extinguishing plate begins to work; the temperature and mass of the lithium battery are obtained; the temperature and mass of the microcapsule fire extinguishing plate are obtained. A3. Based on the temperature and mass of the lithium battery, calculate the total heat accumulation of the lithium battery during thermal runaway; A4. When a lithium battery experiences thermal runaway, the microcapsule fire extinguishing tablet releases the fire extinguishing agent, absorbs heat, and evaporates. Calculate the heat absorption rate of the microcapsule fire extinguishing tablet during thermal runaway. A5. Calculate the proportional coefficient of the battery's cooling capacity based on the radius of the lithium battery and the distance between the lithium battery and the microcapsule fire extinguishing plate. A6. Using the heat absorption rate and the proportional coefficient of the cooling capacity of lithium batteries, calculate the maximum cooling capacity of a single lithium battery under the action of microcapsule fire extinguishing. A7. Evaluate the fire suppression effect of capsule fire extinguishing tablets on lithium battery fires based on the total heat accumulation of the lithium battery during thermal runaway and the maximum cooling capacity of a single lithium battery. Calculate the total heat accumulation of the lithium battery during thermal runaway based on its temperature and mass: （1）； Total heat accumulation It refers to the specific heat capacity of a lithium battery. It's about the quality of the lithium battery. That is the maximum temperature of a lithium battery. It is the ambient temperature; In step A4, the heat absorption rate of the extinguishing capsule during thermal runaway is calculated: （2）； Heat absorption rate : Temperature of the microcapsule fire extinguishing tablets; It is the specific heat capacity of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the evaporation temperature of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules. It is the ambient temperature. It refers to the quality of the fire extinguishing agent encapsulated in the fire extinguishing microcapsules; Latent heat of vaporization The mass of the fire extinguishing agent encapsulated in the fire extinguishing microcapsule that has undergone a phase change.

2. The method according to claim 1, characterized in that, In step A5, the proportional coefficient of the cooling capacity of the thermal battery is calculated. : （3）； It is the radius of lithium battery 1. It is the distance between lithium battery 1 and microcapsule fire extinguishing plate 2. This is an experimental constant.

3. The method according to claim 2, characterized in that, In step A6, the maximum cooling capacity of a single lithium battery Obtained from the following formula: （4）。 4. The method according to claim 1, characterized in that, In step A7, when the maximum cooling capacity is greater than the total heat accumulation, it indicates that the fire extinguishing microcapsule has a good fire suppression capability; otherwise, it indicates that its cooling capacity is insufficient and it is difficult to effectively suppress the thermal runaway of lithium batteries and the development of fire.

5. A fire suppression testing platform for fire extinguishing microcapsules, characterized in that, As a platform for the fire suppression testing method using fire extinguishing microcapsules according to any one of claims 1-4, the fire suppression testing platform for fire extinguishing microcapsules includes: Lithium batteries, microcapsule fire extinguishing tablets, explosion-proof glass boxes, heating elements, thermocouples, battery holders, and balances. The explosion-proof glass enclosure is equipped with a mass balance, lithium battery, heating element and thermocouple, and microcapsule fire extinguishing tablets. The balance contains lithium batteries placed on a battery holder. Heating elements and thermocouples are mounted on the surface of the lithium batteries, and microcapsule fire extinguishing pads are mounted above the lithium batteries. The explosion-proof glass enclosure is equipped with a voltage source, data acquisition device, smoke detector, computer, camera, and thermal imager.

6. The fire suppression test platform for fire extinguishing microcapsules according to claim 5, characterized in that, The smoke detector collects real-time data on the concentration of smoke and combustible gases around the explosion-proof glass enclosure; the camera continuously collects visible light video images inside the explosion-proof glass enclosure; the thermal imager simultaneously collects temperature distribution data of the target inside the explosion-proof glass enclosure; the data acquisition unit simultaneously receives data from the smoke detector, image signals from the camera and thermal imager, performs data filtering and preprocessing, and then transmits the data to the computer.

7. The fire suppression test platform for fire extinguishing microcapsules according to claim 5, characterized in that, It also includes a microcapsule fire extinguishing bracket fixed inside an explosion-proof glass case, with the microcapsule fire extinguishing pads fixed above the lithium battery via the microcapsule fire extinguishing bracket.

8. The fire suppression test platform for fire extinguishing microcapsules according to claim 5, characterized in that, It also includes explosion-proof glass brackets for supporting the explosion-proof glass cases.

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