Lithium battery safety performance test equipment

Abstract

The invention discloses lithium battery safety performance testing equipment which comprises an explosion-proof box, a box cover is connected to the explosion-proof box, a plurality of charging ports are formed in the rear side face of the explosion-proof box, the charging ports are covered with charging panels, the charging panels are made into a whole through high polymer materials in an injection molding mode, the explosion-proof box is of a double-layer structure, and a monitoring mechanism is assembled on one side of the explosion-proof box. The side face of the explosion-proof box is provided with the charging port, and the charging port is covered with the charging panel made of the high polymer material, so that the charging port can be used as an explosion venting port once the battery explodes in the using process, and the design of the charging port can enable internal high-pressure gas to be quickly released, so that the box body is prevented from being broken; the explosion-proof box is provided with a charging port, the charging panel covering the charging port can play a certain blocking role, the explosion-proof box is arranged to be double-layer and can resist high-temperature impact, the multiple sensors capable of moving longitudinally and transversely are assembled in the explosion-proof box, performance parameters of the battery at different positions can be monitored more comprehensively, and therefore the testing precision and reliability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of battery testing devices, and in particular relates to a lithium battery safety performance testing device. Background Art

[0002] Batteries need to be tested for safety before leaving the factory, mainly including overcharging, over-discharging, external short circuit, heating and extrusion tests. In traditional battery membrane group production testing, the cell voltage test of the battery module is carried out by connecting the soldered cable interface on the battery module to the tester, but when the battery fails, it will easily cause safety hazards.

[0003] Chinese utility model CN216560927U discloses a lithium battery over-discharge performance test device. When testing a battery cell (lithium battery cell), if an explosion occurs, the pressure and energy generated by the explosion can be effectively discharged from the upwardly arranged explosion vent, and at the same time, an explosion-proof chain is used to ensure that the front door will not be opened by the explosion, thereby ensuring the safety of the test personnel and significantly improving the safety performance.

[0004] In order to prevent the battery from exploding, which would cause the test equipment to be unable to release pressure and lead to damage to the entire device, an explosion vent is provided on the device. However, if the explosion vent does not have proper protective measures, such as explosion-proof nets or other isolation devices, the explosion may cause debris or flames to spray out, causing damage to the surrounding environment and personnel. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In order to solve the problems raised in the above background technology, the present invention adopts the following technical solutions.

[0007] A lithium battery safety performance testing device comprises an explosion-proof box, a box cover is connected to the explosion-proof box by hinges, a plurality of charging ports are provided on the rear side of the explosion-proof box, the charging ports pass through the explosion-proof box, the charging ports are covered with charging plates, the charging plates are made of polymer material by injection molding as a whole, the explosion-proof box is a double-layer structure, a cavity is formed between the two layers, the cavity is filled with silicone foam, one side of the explosion-proof box is equipped with a monitoring mechanism, the monitoring mechanism comprises a first connecting plate which can be displaced laterally in the explosion-proof box, a second connecting plate which can be displaced longitudinally compared with the first connecting plate is equipped on the front surface of the first connecting plate, a first sensor and a second sensor are installed on the second connecting plate, and a camera is installed on the inner surface of the box cover.

[0008] The monitoring mechanism also includes a fixed plate fixed on the inner side of the explosion-proof box, a horizontal slide rail is arranged on the upper end of the front surface of the fixed plate, a first connecting plate is slidably connected to the horizontal slide rail, and a connecting strip is connected to the outer side of the first connecting plate, a cylinder is arranged on the back of the fixed plate, an output end of the cylinder is hinged to the end of the connecting strip, and the first connecting plate is driven by the cylinder to make horizontal displacement on the fixed plate.

[0009] A vertical slide rail is provided on one side of the front surface of the first connecting plate, and the second connecting plate is slidably connected to the vertical slide rail. Track wheels are symmetrically provided on the other side of the front surface of the first connecting plate, and tracks are sleeved between the track wheels. A clamping plate is provided on one side of the second connecting plate, and the clamping plate is fixedly clamped on the track. A motor is installed on the outside of the explosion-proof box, and the driving end of the motor passes through the explosion-proof box and is connected to one of the track wheels.

[0010] The first sensor is a temperature sensor, and the second sensor is a pressure sensor. When the battery is placed inside the explosion-proof box, the second connecting plate moves longitudinally so that the detection end of the second sensor contacts the battery. There is a height difference between the installation positions of the first sensor and the second sensor.

[0011] The first sensor may also be a semiconductor gas sensor, and the second sensor may also be a current sensor. When the battery is placed inside the explosion-proof box, the detection end of the second sensor contacts the battery.

[0012] The charging board is provided with a plurality of charging ports, and the opening positions of the charging ports correspond to the charging ports. When the charging board is installed on the rear side of the explosion-proof box, the charging ports are located inside the charging ports.

[0013] The inner layer of the explosion-proof box is cast from ceramic material, and the inner surface of the explosion-proof box is evenly coated with micro-expansion insulation and flame-retardant coating. The outer layer of the explosion-proof box is cast from alloy steel, and the inner surface of the outer layer of the explosion-proof box is covered with a carbon fiber composite mesh.

[0014] An explosion-proof cabinet lock is arranged in the center of the front surface of the explosion-proof box, and a lock tongue is correspondingly arranged in the center of the front surface of the box cover, and a handle is arranged on the periphery of the lock tongue and connected with the front surface of the box cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The explosion-proof box of the present invention has a charging port on the side thereof, and a charging plate made of a polymer material is covered on the outside of the charging port, so that once the battery explodes during use, the charging port can be used as an explosion vent. The design of the charging port allows the internal high-pressure gas to be released quickly to avoid the box body from rupturing, and the charging plate covering the charging port can play a certain blocking role, preventing the fragments or combustion products generated by the explosion from being directly sprayed into the external environment, thereby reducing damage to surrounding equipment and personnel. Furthermore, the charging plate can protect the charging port from the influence of the external environment, such as preventing dust, moisture or other impurities from entering the charging port, thereby ensuring that the charging port can work normally when needed. Therefore, by covering the charging plate, an extra layer of safety protection can be added without affecting the explosion venting function, thereby improving the safety of the entire explosion-proof box.

[0016] (2) The explosion-proof box of the present invention is configured as a double layer. In the event of a thermal runaway hazard of the battery, the ceramic material of the inner layer itself has good high temperature resistance and can withstand the impact of high temperature. The ceramic material has a relatively certain toughness. When the battery has some situations such as expansion or slight explosion, it can play a certain buffering role and reduce the impact on the overall structure of the explosion-proof box. The micro-expansion heat-insulating flame-retardant coating will expand when heated to form a dense heat-insulating layer to prevent further heat propagation, which can prevent the high temperature generated inside the battery from being transferred to the outer layer and avoid damage to the external structure. The structure of the outer layer cast by alloy steel provides overall strength support, and the carbon fiber composite mesh covering the inner surface can further enhance the stability of the outer layer structure. At the same time, the carbon fiber composite mesh also has a certain heat-insulating property to help prevent the heat of the inner layer from diffusing outward.

[0017] (3) The present invention is equipped with multiple sensors that can move vertically and horizontally in the explosion-proof box, which can more comprehensively monitor the performance parameters of the battery at different positions, thereby improving the accuracy and reliability of the test. The sensors can monitor the status of the battery in real time. Once an abnormal situation is found, measures can be taken in time to avoid the occurrence of safety accidents. The sensors that can move vertically and horizontally can move freely in the battery test box as needed, thereby realizing rapid switching and monitoring of different batteries or different test points, improving the test efficiency. At the same time, different sensors can be installed to detect the battery as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional structure of the lithium battery safety performance testing equipment in the present invention Figure 1 .

[0019] Figure 2 The three-dimensional structure of the lithium battery safety performance testing equipment in the present invention Figure 2 .

[0020] Figure 3The three-dimensional structure of the lithium battery safety performance testing equipment in the present invention Figure 3 .

[0021] Figure 4 The present invention discloses a three-dimensional structure of a box cover in the lithium battery safety performance testing equipment.

[0022] Figure 5 The monitoring mechanism structure of the lithium battery safety performance testing equipment in the present invention Figure 1 .

[0023] Figure 6 The monitoring mechanism structure of the lithium battery safety performance testing equipment in the present invention Figure 2 .

[0024] The corresponding relationship between the various figure labels and component names in the figure is as follows: 100, explosion-proof box; 101, box cover; 1011, camera; 102, telescopic rod; 103, charging board; 200, monitoring mechanism; 201, fixing plate; 202, first connecting plate; 2021, connecting strip; 203, cylinder; 204, second connecting plate; 2041, first sensor; 2042, second sensor. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0028] See also Figure 1-3101 is a structural diagram of a lithium battery safety performance test device in this embodiment. The test device in this embodiment includes an explosion-proof box 100, and a box cover 101 is connected to the explosion-proof box 100 by a hinge. In this embodiment, the explosion-proof box 100 and the box cover 101 form a relatively sealed explosion-proof safety test box. The battery is placed in the box for testing. When the battery accidentally explodes during the test, the explosion-proof safety test box in this embodiment can prevent damage to personnel or property caused by the explosion. Further, in order to ensure the sealing firmness of the explosion-proof safety test box after closing, this embodiment is provided with an explosion-proof cabinet lock in the center of the front surface of the explosion-proof box 100, and a lock tongue is correspondingly installed in the center of the front surface of the box cover 101. A handle is provided on the periphery of the lock tongue and is connected to the front surface of the box cover 101. When the explosion-proof box 100 and the box cover 101 are closed, the connection firmness of the explosion-proof box 100 and the box cover 10 is ensured by locking the explosion-proof cabinet lock and the lock tongue. The explosion-proof cabinet lock in this embodiment can adopt MY-I-F005 280KG explosion-proof magnetic lock, which consists of a protection unit installed in a safe area and an explosion-proof magnetic lock installed in a dangerous area. In existing applications, it is usually used in other explosive gas environments other than acetylene and hydrogen, so it is more suitable for the explosion-proof safety test box in the present invention.

[0029] Furthermore, the explosion-proof box 100 in this embodiment is a double-layer structure, which has a certain buffering effect, alleviating the impact of the energy impact caused by the battery explosion on the surrounding environment of the equipment. The specific structure is: the inner layer of the explosion-proof box 100 is cast from a ceramic material, and the ceramic material of the inner layer itself has good high temperature resistance and can withstand the impact of high temperature, and the ceramic material has a certain toughness. When the battery has some situations such as expansion and slight explosion, it can play a certain buffering role and reduce the impact on the overall structure of the explosion-proof box, and the inner surface of the explosion-proof box 100 is evenly coated with a micro-expansion insulation heat insulation flame retardant coating, and the micro-expansion insulation flame retardant coating is It will expand when heated to form a dense insulation layer to prevent further heat spread, which can prevent the high temperature generated inside the battery from being transferred to the outer layer, avoiding damage to the external structure. The outer layer of the explosion-proof box 100 is cast from alloy steel, and the structure cast from the alloy steel of the outer layer provides overall strength support, and the inner surface of the outer layer of the explosion-proof box 100 is covered with a carbon fiber composite mesh, and the carbon fiber composite mesh covering the inner surface can further enhance the stability of the outer layer structure. At the same time, the carbon fiber composite mesh also has certain heat insulation properties, which helps prevent the heat of the inner layer from diffusing outward. There is a cavity between the two layers of the structure, and the cavity is filled with silicone foam to achieve the effects of shock absorption, buffering, sound insulation and heat insulation.

[0030] It is worth noting that the micro-expanding insulating heat-insulating flame-retardant coating in this embodiment is used as a prior art coating in the equipment of the present invention, and its role is to assist in flame retardancy and heat insulation, and optimize the flame retardancy and heat insulation effect of the equipment of the present invention. Specifically, the micro-expanding insulating heat-insulating flame-retardant coating is a patent applied by Nippon Paint (China) Co., Ltd. entitled "Micro-expanding insulating heat-insulating flame-retardant coating that can be used for ultra-thin coating, and its preparation method and application". The coating has simple construction, high stability, good electrical insulation performance, excellent flame retardant and heat insulation performance, and can be used for lightweight coating. It can well solve the problems faced in the field of flame retardant coatings for existing new energy vehicle batteries. Therefore, it is used in the explosion-proof box 100 in this embodiment, and it also has a flame retardant and heat insulation effect on accidental explosions caused by battery safety performance tests.

[0031] See also Figure 1 and Figure 2 , a plurality of charging ports are provided on the rear side of the explosion-proof box 100 in the real-time stream, and the charging port in the present embodiment passes through the explosion-proof box 100, so that the charging port can be used as an explosion vent. The design of using the charging port as an explosion vent allows the internal high-pressure gas to be released quickly, thereby avoiding the box body of the explosion-proof box 100 from rupturing, and further a charging plate 103 is covered on the outside of the charging port, and the charging plate 103 is made of a polymer material by injection molding as a whole. In the present embodiment, the charging plate 103 covering the charging port can play a certain blocking role, preventing the fragments or combustion products generated by the explosion from being directly sprayed into the external environment, thereby reducing damage to surrounding equipment and personnel, and further, the charging plate 103 can protect the charging port from the influence of the external environment, such as preventing dust, moisture or other impurities from entering the explosion vent, thereby ensuring that the charging port can work normally when acting as an explosion vent, and therefore, by covering the charging plate 103, it can Without affecting the explosion-proof function, an extra layer of safety protection is added to improve the safety of the entire explosion-proof box. When the battery explodes unexpectedly, its shock wave acts on the charging plate 103, and the charging plate 103 can be completely separated from the explosion-proof box 100, thereby opening the charging port, so that the charging port can be used as an explosion-proof port to vent energy. The material of the charging plate 103 determines that the charging plate 103 affected by the shock wave is relatively complete and not easy to break, thereby preventing fragments from splashing and causing secondary injuries. A plurality of charging ports are provided on the charging plate 103, and the charging port enables external cables to be connected to the battery to be tested inside the explosion-proof box 100, so as to charge and discharge the battery. The opening position of the charging port corresponds to the charging port. When the charging plate 103 is installed on the rear side of the explosion-proof box 100, the charging port is located inside the charging port. This design facilitates the charging plate 103 to block the charging port without affecting use.

[0032] See also Figure 5 and Figure 6In this embodiment, a monitoring mechanism 200 is installed on one side of the explosion-proof box 100. The monitoring mechanism 200 monitors the state of the battery inside the explosion-proof box 100 during detection. Once an abnormal situation is found, measures can be taken in time to avoid the occurrence of safety accidents. The monitoring mechanism 200 includes a first connecting plate 202 that can be laterally displaced in the explosion-proof box 100. The front surface of the first connecting plate 202 is equipped with a second connecting plate 204 that can be longitudinally displaced compared to the first connecting plate 202. The second connecting plate 204 is installed with a first sensor 2041 and a second sensor 2042. In this embodiment, the first sensor 2041 and the second sensor 2042 are connected to each other. 042 can be moved vertically and horizontally in the explosion-proof box 100 through the first connecting plate 202 and the second connecting plate 204. The first sensor 2041 and the second sensor 2042 that move vertically and horizontally can more comprehensively monitor the performance parameters of the battery at different positions, thereby improving the accuracy and reliability of the test. The first sensor 2041 and the second sensor 2042 can monitor the state of the battery in real time. At the same time, the first sensor 2041 and the second sensor 2042 that move vertically and horizontally can move freely in the explosion-proof box 100 as needed, thereby realizing fast switching and monitoring of different batteries or different test points, thereby improving the test efficiency. For further information, refer to Figure 4 In this embodiment, a camera 1011 is installed on the inner surface of the box cover 101, and the test process is recorded by the camera 1011 for later data analysis.

[0033] See also Figure 5 and Figure 6 The monitoring mechanism 200 in this embodiment also includes a fixed plate 201 fixed to the inner side of the explosion-proof box 100. The monitoring mechanism 200 is installed on the inner side of the explosion-proof box 100 through the fixed plate 201. A horizontal slide rail is provided on the upper end of the front surface of the fixed plate 201. The first connecting plate 202 is slidably connected to the horizontal slide rail. At this time, the first connecting plate 202 can be slid on the fixed plate 201 manually. Since the entire device is in a relatively sealed state when testing the battery, it is not realistic to manually move the first connecting plate 202. In order to solve this problem, a connecting strip 2021 is connected to the outer side of the first connecting plate 202 in this embodiment. A cylinder 203 is provided on the back of the fixed plate 201. The output end of the cylinder 203 is hinged to the end of the connecting strip 2021. In this embodiment, the first connecting plate 202 is driven by the cylinder 203 to make a horizontal displacement on the fixed plate 201, so that the second connecting plate 204 connected to the first connecting plate 202 follows the synchronous movement, and the first sensor 2041 and the second sensor 2042 arranged on the second connecting plate 204 further realize lateral movement.

[0034] Continue reading Figure 5 and Figure 6In the embodiment, a vertical slide rail is provided on one side of the front surface of the first connecting plate 202, and the second connecting plate 204 is slidably connected to the vertical slide rail. Similarly, when the equipment is in a relatively sealed state, it is impossible to manually move the second connecting plate 204 to make vertical movement on the first connecting plate 202. Therefore, in this embodiment, track wheels are symmetrically provided on the other side of the front surface of the first connecting plate 202, and a track is sleeved between the track wheels. A clamping plate is provided on one side of the second connecting plate 204, and the clamping plate is fixedly clamped on the track. A motor is installed on the outside of the explosion-proof box 100, and the driving end of the motor passes through the explosion-proof box 100 and is connected to one of the track wheels. In this embodiment, one of the track wheels is driven to rotate by the motor. Since both the track wheel and the track are provided with ribs, when the track wheel rotates, the track is driven to make a circular motion, and the second connecting plate 204, which is fixedly connected to one side of the track through the clamping plate, naturally moves on the vertical slide rail driven by the operation of the track, and then the first sensor 2041 and the second sensor 2042 installed on the second connecting plate 204 realize longitudinal movement.

[0035] It is worth noting that, according to the general needs of battery detection, the first sensor 2041 in this embodiment can be set as a temperature sensor. The temperature sensor is used to monitor the temperature change of the battery. During the battery charging and discharging process, the temperature change may affect the performance and safety of the battery. Excessive temperature may cause the chemical reaction inside the battery to intensify, thereby causing safety problems such as thermal runaway. Through the temperature sensor, the temperature of the battery can be monitored in real time. Once the temperature exceeds the safe range, measures can be taken in time to prevent accidents. The second sensor 2042 is a pressure sensor. In some lithium-ion batteries, when the battery has thermal runaway, the internal pressure will change. Through the pressure sensor, this pressure change can be detected, thereby realizing the monitoring of the battery safety state. In order to reduce the error of pressure sensing data, in this embodiment, when the battery is placed inside the explosion-proof box 100, the second connecting plate 204 moves longitudinally so that the detection end of the second sensor 2042 contacts the battery. In order to prevent the adjustment of the height of the pressure sensor from causing the temperature sensor to be unable to monitor the internal temperature of the explosion-proof box 100 at a suitable height, the installation positions of the first sensor 2041 and the second sensor 2042 in this embodiment have a height difference.

[0036] Furthermore, in order to meet the needs of battery safety performance detection, the first sensor 2041 in this embodiment can also be a semiconductor gas sensor. The semiconductor gas sensor is used to detect characteristic gases generated during the operation of the battery, such as hydrogen and carbon monoxide. It uses the characteristics of semiconductor materials. When gas molecules are adsorbed on the surface of the semiconductor, the electrical properties of the semiconductor will change, thereby realizing the detection of the gas. In the battery management system, accurate monitoring of current is crucial to prevent the battery from overcharging and over-discharging. Therefore, the second sensor 2042 can also be a current sensor. Similarly, in order to monitor the accuracy of the data, when the battery is placed inside the explosion-proof box 100, the detection end of the second sensor 2042 is in contact with the battery.

[0037] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A lithium battery safety performance testing device, comprising an explosion-proof box (100), wherein the explosion-proof box (100) is connected to a box cover (101) by a hinge, and a plurality of charging ports are provided on the rear side of the explosion-proof box (100), wherein the charging ports pass through the explosion-proof box (100), Features: The charging port is covered with a charging plate (103), the charging plate (103) being made of a polymer material by injection molding as a whole; the explosion-proof box (100) is a double-layer structure, a cavity is formed between the two layers, and the cavity is filled with organic silicone foam; one side of the explosion-proof box (100) is equipped with a monitoring mechanism (200), the monitoring mechanism (200) comprises a first connecting plate (202) which can be displaced laterally in the explosion-proof box (100), a second connecting plate (204) which can be displaced longitudinally compared to the first connecting plate (202) is equipped on the front surface of the first connecting plate (202), a first sensor (2041) and a second sensor (2042) are installed on the second connecting plate (204), and a camera (1011) is installed on the inner surface of the box cover (101).

2. The lithium battery safety performance testing equipment according to claim 1, characterized in that: The monitoring mechanism (200) further comprises a fixing plate (201) fixed to the inner side of the explosion-proof box (100); a horizontal slide rail is arranged at the upper end of the front surface of the fixing plate (201); a first connecting plate (202) is slidably connected to the horizontal slide rail; and a connecting strip (2021) is connected to the outer side of the first connecting plate (202); a cylinder (203) is arranged on the back side of the fixing plate (201); an output end of the cylinder (203) is hinged to an end of the connecting strip (2021); and the first connecting plate (202) is driven by the cylinder (203) to make a horizontal displacement on the fixing plate (201).

3. The lithium battery safety performance testing equipment according to claim 2, characterized in that: A vertical slide rail is provided on one side of the front surface of the first connecting plate (202), the second connecting plate (204) is slidably connected to the vertical slide rail, track wheels are symmetrically provided on the other side of the front surface of the first connecting plate (202), a track is sleeved between the track wheels, a clamping plate is provided on one side of the second connecting plate (204), and the clamping plate is fixedly clamped on the track, a motor is installed on the outside of the explosion-proof box (100), and a driving end of the motor passes through the explosion-proof box (100) and is connected to one of the track wheels.

4. The lithium battery safety performance testing equipment according to claim 1, characterized in that: The first sensor (2041) is a temperature sensor, and the second sensor (2042) is a pressure sensor; when the battery is placed inside the explosion-proof box (100), the second connecting plate (204) moves longitudinally so that the detection end of the second sensor (2042) contacts the battery; and there is a height difference between the installation positions of the first sensor (2041) and the second sensor (2042).

5. The lithium battery safety performance testing equipment according to claim 4, characterized in that: The first sensor (2041) may also be a semiconductor gas sensor, and the second sensor (2042) may also be a current sensor; when a battery is placed inside the explosion-proof box (100), a detection end of the second sensor (2042) contacts the battery.

6. The lithium battery safety performance testing equipment according to claim 1, characterized in that: The charging plate (103) is provided with a plurality of charging ports, the opening positions of the charging ports correspond to the charging ports, and when the charging plate (103) is installed on the rear side of the explosion-proof box (100), the charging ports are located inside the charging ports.

7. The lithium battery safety performance testing equipment according to claim 1, characterized in that: The inner layer of the explosion-proof box (100) is cast from a ceramic material, and the surface of the inner layer of the explosion-proof box (100) is evenly coated with a micro-expansion insulating heat-insulating flame-retardant coating; the outer layer of the explosion-proof box (100) is cast from alloy steel, and the inner surface of the outer layer of the explosion-proof box (100) is covered with a carbon fiber composite mesh.

8. The lithium battery safety performance testing equipment according to claim 1, characterized in that: An explosion-proof cabinet lock is provided in the center of the front surface of the explosion-proof box (100), and a lock tongue is correspondingly installed in the center of the front surface of the box cover (101), and a handle is provided on the periphery of the lock tongue and connected to the front surface of the box cover (101).

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