Lithium battery module compression resistance testing device and testing method

Abstract

The invention provides a lithium battery module compression resistance testing device and testing method, and belongs to the technical field of lithium battery detection.The lithium battery module compression resistance testing device comprises a testing table, limiting sliding rods are fixedly connected to the four corners of the upper end of the testing table, and two top plates are fixedly connected to the upper ends of the multiple limiting sliding rods respectively; the protection box is connected to the circumferential surfaces of the multiple limiting sliding rods in a sliding mode; the number of the purification mechanisms is two, and each purification mechanism comprises an air inlet channel, an air pump, an air conveying pipe, an exhaust channel, an absorption box, a partition plate, sponge, an air inlet pipe, lime water and a heater; by using the device, when the lithium battery module is subjected to a compression resistance test, if spontaneous combustion occurs, the purification mechanism absorbs and purifies carbon monoxide gas generated by spontaneous combustion, so that the environment is prevented from being polluted by carbon monoxide, and a tester is prevented from being poisoned by inhaling excessive carbon monoxide gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery detection, and in particular relates to a lithium battery module compression test device and a test method. Background Art

[0002] Lithium battery module testing is a key step to ensure the safety and reliability of batteries in actual use, covering comprehensive evaluations of electrical performance, environmental adaptability, safety, and other aspects. Among them, the compression test is an important test for whether the battery module can maintain structural integrity and electrical safety under external forces. This test usually simulates the extrusion that the battery may encounter during transportation, installation, and use to verify whether it can withstand specific pressure without leakage, deformation, or short circuit.

[0003] Compression tests are usually conducted on a dedicated test platform, simulating different pressure conditions by applying static or dynamic forces. For static pressure tests, the test equipment gradually increases the pressure on the battery module until it reaches a preset value and maintains it for a period of time; while dynamic pressure tests simulate more complex situations such as impact or vibration. During this process, technicians need to closely monitor the battery's voltage changes, temperature rise, and signs of gas release. These data can help determine whether the battery has internal short circuits or electrolyte leakage.

[0004] During the testing process, if it is found that the battery module cannot meet the predetermined safety indicators, it is necessary to analyze the reasons and improve the design until it passes all necessary test items. The entire testing process not only helps to improve the overall quality of battery products, but also provides consumers with safer and more reliable energy solutions. With the advancement of technology and changes in market demand, the methods and technologies of lithium battery module testing are also constantly evolving and improving to meet increasingly complex challenges.

[0005] In the prior art, a lithium battery module is subjected to a compression test. When the lithium battery module is subjected to pressure, its interior is squeezed and a short circuit occurs. The temperature inside the lithium battery module rises sharply, resulting in spontaneous combustion. The spontaneous combustion produces harmful gases, mainly carbon monoxide. In previous tests, the carbon monoxide could not be purified and was directly discharged into the environment, polluting the environment. If the surrounding testers inhaled excessive amounts, they were at risk of poisoning. Summary of the invention

[0006] The purpose of the present invention is to provide a lithium battery module compression test device and test method, which aims to solve the problem that in the prior art, when the lithium battery module is subjected to compression test, the lithium battery module is squeezed internally, a short circuit occurs, and the temperature inside the lithium battery module rises sharply, resulting in spontaneous combustion. The spontaneous combustion produces harmful gases, mainly carbon monoxide. In the past, during the test, carbon monoxide could not be purified and was directly discharged into the environment, polluting the environment. The surrounding test personnel are inhaled excessively and are at risk of poisoning. To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A lithium battery module compression test device, comprising:

[0008] A test bench, wherein the four corners of the upper end of the test bench are fixedly connected with limit sliding bars, and the upper ends of the limit sliding bars are respectively fixedly connected with two top plates;

[0009] A protection box, wherein the protection box is slidably connected to the circumferential surface of the plurality of limit sliding rods;

[0010] A purification mechanism, which is provided with two groups, each group of the purification mechanisms includes an air intake channel, an air pump, an air delivery pipe, an exhaust channel, an absorption box, a partition, a sponge, an air intake pipe, lime water and a heater, the air intake channel is opened in the protection box, the air pump is fixedly connected to the upper surface of the protection box, the air pump is connected to the air intake channel, the air delivery pipe is fixedly connected to the protection box, the air delivery pipe is communicated with the air intake channel, the absorption box is slidably connected in the protection box, the air intake pipe is fixedly connected to the upper inner wall of the absorption box, the air intake pipe is connected to the air delivery pipe, the partition is fixedly connected to the upper inner wall of the absorption box, the sponge is fixedly connected to the upper inner wall of the absorption box, the exhaust channel is opened in the protection box, the exhaust channel is communicated with the absorption box, the heater is installed in the absorption box, and the limestone is arranged in the absorption box;

[0011] The pressure mechanism is arranged on the upper side of the protection box, and the pressure mechanism is connected to the protection box to control the movement of the protection box.

[0012] As a preferred solution of the present invention, the pressure mechanism includes a pressure plate, a hydraulic cylinder, a mounting block, a positioning ring plate, a detector and two groups of positioning components, the positioning ring plate is fixedly connected to the inner wall of the protection box, the pressure plate is slidably connected in the positioning ring plate, the two mounting blocks are respectively fixedly connected to the upper surfaces of the two top plates, the hydraulic cylinder is fixedly connected to the upper ends of the two mounting blocks, the extended end of the hydraulic cylinder movably penetrates the inner wall of the protection box and is fixed to the upper end of the pressure plate, the detector is installed in the pressure plate, the two groups of positioning components are both arranged in the positioning ring plate, and the two groups of positioning components are both connected to the pressure plate.

[0013] As a preferred solution of the present invention, each group of the positioning components includes an elastic groove, a first spring and a positioning block, a plurality of the first springs are provided, the elastic groove is opened in the positioning ring plate, the positioning block is slidably connected in the elastic groove, the plurality of the first springs are fixedly connected to the inner wall of the elastic groove, and the plurality of the first springs are fixed to one end of the positioning block.

[0014] As a preferred solution of the present invention, a sealing plate is fixedly connected to the inner wall of the protection box, and a sealing groove is opened on the upper surface of the test bench, and the sealing groove matches the sealing plate.

[0015] As a preferred solution of the present invention, both sides of the lower end of the test bench are fixedly connected with water tanks.

[0016] As a preferred solution of the present invention, a plurality of connecting mechanisms are provided in the sealing groove, each of which includes a connecting pipe, a connecting hole sliding groove, a slider, a sliding rod and a second spring, and two of the connecting holes, sliding grooves, sliders, sliding rods and second springs are provided. The connecting pipe is slidably connected in the test bench, and the connecting pipe is connected to the water tank. The two connecting holes are both opened on the upper and lower sides of the connecting pipe, and the two sliding grooves are both opened in the test bench. The two sliding rods are respectively fixedly connected to the inner walls of the two sliding grooves, and the two sliders are fixedly connected to the circumferential surface of the connecting pipe. The two sliders are respectively slidably connected to the circumferential surfaces of the two sliding rods, and the two second springs are respectively sleeved on the circumferential surfaces of the two sliding rods, and the two second springs are respectively arranged on the lower sides of the two sliders.

[0017] As a preferred solution of the present invention, water pipes are fixedly connected to the surfaces of the two water tanks.

[0018] As a preferred solution of the present invention, four corners of the lower end of the test bench are fixedly connected with supporting feet, and surfaces of the plurality of supporting feet are respectively fixedly connected with two reinforcing beams.

[0019] As a preferred solution of the present invention, a placement plate is fixedly connected to the upper end of the test bench, two filter screens are fixedly connected in the protection box, and two handles are fixedly connected to the surfaces of the two absorption boxes.

[0020] A testing method for a lithium battery module compression test device comprises the following steps:

[0021] S1. Connect the water pipe to the water source, then place the lithium battery module to be subjected to the compression test on the surface of the placement plate, control the operation of the hydraulic cylinder, and the extended end of the hydraulic cylinder drives the protection box to move down to the upper surface of the test bench; the sealing plate slides into the sealing groove, and the lower end of the sealing plate contacts the upper end of the connecting pipe, driving the connecting pipe to overcome the elastic force of the second spring, so that the connecting hole on the lower side contacts the water tank, and the water source in the water tank flows into the sealing groove from the connecting hole on the upper side after passing through the connecting hole and the connecting pipe, and the connection between the sealing plate and the sealing groove is water-sealed;

[0022] S2, continue to control the extension end of the hydraulic cylinder to drive the pressing plate to move downward, the pressing plate squeezes the positioning block, overcomes the elastic force of the first spring to make the positioning block slide into the elastic groove, the pressing plate contacts the surface of the lithium battery module to be tested, and continues to squeeze the lithium battery. The pressure size is recorded by the detector during this process. When the lithium battery module is squeezed to a certain extent, the lithium battery module is short-circuited internally and spontaneous combustion occurs;

[0023] S3. The air pump is running to pump the carbon monoxide gas generated by the spontaneous combustion of the lithium battery module into the limestone through the air intake channel, the air delivery pipe and the air intake pipe. The heater heats the limestone, and the carbon monoxide reacts with the limestone to produce calcium carbonate. The carbon monoxide in the gas is filtered, and the filtered gas is discharged into the outside air through the exhaust channel until the pressure test of the lithium battery module is completed.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In this scheme, by using this device, when the lithium battery module is subjected to a compression test, if spontaneous combustion occurs, the purification mechanism absorbs and purifies the carbon monoxide gas generated by the spontaneous combustion to avoid carbon monoxide polluting the environment and to prevent the test personnel from inhaling excessive carbon monoxide gas and being poisoned.

[0026] 2. In this solution, when the protection box contacts the upper surface of the test bench, the hydraulic cylinder continues to be controlled to move downward, and the pressure plate overcomes the elastic force of the two sets of first springs, so that the pressure plate moves downward and presses on the surface of the lithium battery module, and the detector continuously records the pressurization situation.

[0027] 3. In this solution, the sealing plate slides into the sealing groove, and the sealing plate drives the connecting pipe to overcome the elastic force of *805., so that the connecting pipe moves downward, the connecting hole on the lower side is connected to the water tank, and the connecting hole on the upper side is connected to the sealing groove. The water source in the water tank is injected into the sealing groove through the connecting pipe through the water pressure, and the water seal is used to increase the sealing of the protection box to prevent gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a first perspective stereogram of the present invention;

[0030] Figure 2 It is a second viewing angle stereogram of the present invention;

[0031] Figure 3 It is a third perspective stereogram of the present invention;

[0032] Figure 4 It is a fourth perspective stereogram of the present invention;

[0033] Figure 5 is a first cross-sectional view of the present invention;

[0034] Figure 6 is a second cross-sectional view of the present invention;

[0035] Figure 7 For the present invention Figure 6 A partial enlarged view of the middle A;

[0036] Figure 8 is a second cross-sectional view of the present invention;

[0037] Fig. 9 For the present invention Figure 8 A partial enlarged view of point B in the middle;

[0038] Fig.10 It is a flowchart of the present invention.

[0039] In the figure: 1. test bench; 101. placement plate; 102. limit slide bar; 103. sealing groove; 104. top plate; 2. protection box; 201. sealing plate; 202. positioning ring plate; 3. pressure plate; 301. hydraulic cylinder; 302. mounting block; 4. air intake channel; 401. air pump; 402. air supply pipe; 403. exhaust channel; 404. absorption box; 405. partition; 406. sponge; 407. handle; 408. filter; 409. air intake pipe; 5. support foot; 501. reinforcement beam; 6. water tank; 601. water supply pipe; 7. elastic groove; 701. first spring; 702. positioning block; 8. connecting pipe; 801. connecting hole; 802. sliding groove; 803. slider; 804. slide bar; 805. second spring. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1

[0044] See also Figure 1-Figure 10 , the present invention provides the following technical solutions:

[0045] A lithium battery module compression test device, comprising:

[0046] The test bench 1 has four corners at the upper end thereof fixedly connected with limit slide bars 102, and the upper ends of the limit slide bars 102 are respectively fixedly connected with two top plates 104;

[0047] A protection box 2, the protection box 2 is slidably connected to the circumferential surface of a plurality of limiting sliding rods 102;

[0048] Purification mechanism, which is provided with two groups, each group of purification mechanism includes an air intake channel 4, an air pump 401, an air delivery pipe 402, an exhaust channel 403, an absorption box 404, a partition 405, a sponge 406, an air intake pipe 409, lime water and a heater, the air intake channel 4 is opened in the protection box 2, the air pump 401 is fixedly connected to the upper surface of the protection box 2, the air pump 401 is connected to the air intake channel 4, the air delivery pipe 402 is fixedly connected to the protection box 2, and the air delivery pipe 402 is communicated with the air intake channel 4 , the absorption box 404 is slidably connected to the protection box 2, the air inlet pipe 409 is fixedly connected to the upper inner wall of the absorption box 404, the air inlet pipe 409 is connected to the gas pipe 402, the partition plate 405 is fixedly connected to the upper inner wall of the absorption box 404, the sponge 406 is fixedly connected to the upper inner wall of the absorption box 404, the exhaust channel 403 is opened in the protection box 2, the exhaust channel 403 is connected to the absorption box 404, the heater is installed in the absorption box 404, and the limestone is arranged in the absorption box 404;

[0049] The pressure mechanism is arranged on the upper side of the protection box 2 . The pressure mechanism is connected to the protection box 2 and can control the movement of the protection box 2 .

[0050] In a specific embodiment of the present invention, the limit slide bars 102 installed at the four corners of the upper end of the test bench 1 play a role in connecting the protection box 2, and the two top plates 104 play a role in connecting the mounting block 302. When testing the lithium battery module, the lithium battery module is placed on the surface of the placement plate 101, and the protection box 2 is controlled to move down and cover the surface of the lithium battery module, and then the lithium battery module is subjected to a pressure test. When the lithium battery module is subjected to a pressure test, if spontaneous combustion occurs, the purification mechanism absorbs and purifies the carbon monoxide gas generated by the spontaneous combustion to avoid carbon monoxide pollution to the environment and to prevent the test personnel from inhaling excessive monoxide. Carbon monoxide poisoning; when the pressure plate 3 moves downward, the air inlet channel 4 is connected with the environment inside the protection box 2, and the gas in the protection box 2 is pumped into the lime water added in the absorption box 404 through the air pump 401 through the air inlet channel 4, the air pipe 402 and the air inlet pipe 409. The lime water is heated by the heater, and the lime water reacts with carbon monoxide to produce calcium carbonate precipitation, which purifies the gas and prevents carbon monoxide gas from polluting the external environment. The absorption box 404 is slidably connected in the protection box 2, and a sufficient amount of lime water is placed in the absorption box 404. The sponge 406 is made of high temperature resistant material and is used to absorb part of the moisture in the gas.

[0051] For details, please refer to Figure 1-Figure 10The pressure mechanism includes a pressure plate 3, a hydraulic cylinder 301, a mounting block 302, a positioning ring plate 202, a detector and two sets of positioning components. The positioning ring plate 202 is fixedly connected to the inner wall of the protection box 2, the pressure plate 3 is slidably connected in the positioning ring plate 202, the two mounting blocks 302 are respectively fixedly connected to the upper surfaces of the two top plates 104, the hydraulic cylinder 301 is fixedly connected to the upper ends of the two mounting blocks 302, the extended end of the hydraulic cylinder 301 movably penetrates the inner wall of the protection box 2 and is fixed to the upper end of the pressure plate 3, the detector is installed in the pressure plate 3, the two sets of positioning components are both arranged in the positioning ring plate 202, and the two sets of positioning components are both connected to the pressure plate 3.

[0052] In this embodiment: the hydraulic cylinder 301 in the pressure mechanism drives the protection box 2 to move downward during operation, and at this time 3 is positioned by two sets of positioning components. When the protection box 2 contacts the upper surface of the test bench 1, the hydraulic cylinder 301 is continuously controlled to move downward, and the pressing plate 3 overcomes the elastic force of the two sets of first springs 701, so that the pressing plate 3 moves downward and presses on the surface of the lithium battery module, and the detector continuously records the pressurization situation.

[0053] For details, please refer to Figure 1-Figure 10 Each positioning assembly includes an elastic groove 7, a first spring 701 and a positioning block 702. A plurality of first springs 701 are provided. The elastic groove 7 is opened in the positioning ring plate 202. The positioning block 702 is slidably connected in the elastic groove 7. The plurality of first springs 701 are fixedly connected to the inner wall of the elastic groove 7. The plurality of first springs 701 are fixed to one end of the positioning block 702.

[0054] In this embodiment, the positioning block 702 in the positioning assembly positions the pressing plate 3 under the elastic force of the first spring 701 , and the surface of the positioning block 702 is triangular, which facilitates the pressing plate 3 to be pressed down and reset.

[0055] For details, please refer to Figure 1-Figure 10 A sealing plate 201 is fixedly connected to the inner wall of the protection box 2 , and a sealing groove 103 is opened on the upper surface of the test bench 1 , and the sealing groove 103 matches the sealing plate 201 .

[0056] In this embodiment, the sealing plate 201 , the sealing groove 103 and the water cooperate to seal the inside of the protection box 2 .

[0057] For details, please refer to Figure 1-Figure 10 Water tanks 6 are fixedly connected to both sides of the lower end of the test bench 1.

[0058] In this embodiment, the water tank 6 is used to put water, and the water is injected into the water tank 6 through the water pipe 601. The water in the water tank 6 has a certain water pressure.

[0059] For details, please refer to Figure 1-Figure 10, a plurality of connecting mechanisms are provided in the sealing groove 103, each connecting mechanism comprises a connecting pipe 8, a connecting hole 801, a sliding groove 802, a slider 803, a sliding rod 804 and a second spring 805, and two connecting holes 801, sliding groove 802, slider 803, sliding rod 804 and second spring 805 are provided. The connecting pipe 8 is slidably connected in the test bench 1, and the connecting pipe 8 is connected to the water tank 6. The two connecting holes 801 are both provided at the upper and lower sides of the connecting pipe 8, and the two sliding grooves 802 are both provided in the test bench 1. The two sliding rods 804 are respectively fixedly connected to the inner walls of the two sliding grooves 802, and the two sliders 803 are both fixedly connected to the circumferential surface of the connecting pipe 8. The two sliders 803 are respectively slidably connected to the circumferential surfaces of the two sliding rods 804, and the two second springs 805 are respectively sleeved on the circumferential surfaces of the two sliding rods 804, and the two second springs 805 are respectively provided on the lower sides of the two sliders 803.

[0060] In this embodiment, 203 slides into the sealing groove 103, and the sealing plate 201 drives the connecting pipe 8 to overcome the elastic force of the second spring 805, so that the connecting pipe 8 moves downward, and the connecting hole 801 located at the lower side is connected to the water tank 6, and the connecting hole 801 located at the upper side is connected to the sealing groove 103. The water source in the water tank 6 is injected into the sealing groove 103 through the connecting pipe 8 through the water pressure, and the water seal is used to increase the sealing of the protection box 2 to prevent gas leakage.

[0061] For details, please refer to Figure 1-Figure 10 A water pipe 601 is fixedly connected to the surfaces of the two water tanks 6 .

[0062] In this embodiment, the water pipe 601 is connected to a water source, and the water source is injected into the two water tanks 6 through the water pipe 601 .

[0063] For details, please refer to Figure 1-Figure 10 The four corners of the lower end of the test bench 1 are fixedly connected with supporting legs 5, and the surfaces of the multiple supporting legs 5 are respectively fixedly connected with two reinforcing beams 501.

[0064] In this embodiment: the reinforcement beam 501 serves to reinforce the support leg 5, so as to increase the stability of the support leg 5 in supporting the ground.

[0065] For details, please refer to Figure 1-Figure 10 A placement plate 101 is fixedly connected to the upper end of the test bench 1 , two filter screens 408 are fixedly connected inside the protection box 2 , and two handles 407 are fixedly connected to the surfaces of the two absorption boxes 404 .

[0066] In this embodiment: the surface of the placement plate 101 is used to place the lithium battery module, the filter 408 plays a role in distributing the filtered gas, and the handle 407 facilitates the sliding of the absorption box 404, so as to facilitate the treatment of the used lime water.

[0067] It should be noted that the heater, detector, hydraulic cylinder 301 and air pump 401 used in this solution are all existing technologies. The specific types of heater, detector, hydraulic cylinder 301 and air pump 401 can be selected according to actual conditions and will not be elaborated here.

[0068] Working principle and use process of the present invention: When the device is in use, first connect the water pipe 601 to the water source, then place the lithium battery module to be subjected to the pressure resistance test on the surface of the placement plate 101, control the operation of the hydraulic cylinder 301, and the extended end of the hydraulic cylinder 301 drives the protection box 2 to move down to the upper surface of the test bench 1; the sealing plate 201 slides into the sealing groove 103, and the lower end of the sealing plate 201 contacts the upper end of the connecting pipe 8, driving the connecting pipe 8 to overcome the elastic force of the second spring 805, so that the connecting hole 801 located on the lower side contacts with the water tank 6, and the water source in the water tank 6 passes through the connecting hole 801 and the connecting pipe 8 and flows into the sealing groove 103 from the connecting hole 801 located on the upper side, and the connection between the sealing plate 201 and the sealing groove 103 is water-sealed; continue to control the extended end of the hydraulic cylinder 301 to drive the pressing plate 3 to move downward, and the pressing plate 3 squeezes the positioning block 702 to overcome the elastic force of the first spring 701 The elastic force causes the positioning block 702 to slide into the elastic groove 7, and the pressing plate 3 contacts the surface of the lithium battery module to be tested, and continues to squeeze the lithium battery. The pressure size of this process is recorded by the detector. When the lithium battery module is squeezed to a certain extent, the lithium battery module is short-circuited internally and spontaneous combustion occurs; the air pump 401 is controlled to operate, and the carbon monoxide gas generated by the spontaneous combustion of the lithium battery module is pumped into the limestone through the air intake channel 4, the air delivery pipe 402 and the air intake pipe 409. The heater heats the limestone, and the carbon monoxide reacts with the limestone to produce calcium carbonate. The carbon monoxide in the gas is filtered, and the filtered gas is discharged into the outside air through the exhaust channel 403 until the pressure test of the lithium battery module is completed; by using this device, when the lithium battery module is subjected to a pressure test, if spontaneous combustion occurs, the purification mechanism absorbs and purifies the carbon monoxide gas generated by the spontaneous combustion to avoid carbon monoxide polluting the environment and to avoid poisoning of the test personnel due to inhalation of excessive carbon monoxide gas.

[0069] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium battery module compression test device, characterized in that: include: A test bench (1), wherein the four corners of the upper end of the test bench (1) are fixedly connected to limit sliding bars (102), and the upper ends of the plurality of limit sliding bars (102) are respectively fixedly connected to two top plates (104); A protection box (2), wherein the protection box (2) is slidably connected to the circumferential surface of a plurality of limiting sliding rods (102); The purification mechanism is provided with two groups, each group of the purification mechanisms comprises an air intake channel (4), an air pump (401), an air delivery pipe (402), an exhaust channel (403), an absorption box (404), a partition (405), a sponge (406), an air intake pipe (409), lime water and a heater, the air intake channel (4) is opened in the protection box (2), the air pump (401) is fixedly connected to the upper surface of the protection box (2), the air pump (401) is connected to the air intake channel (4), the air delivery pipe (402) is fixedly connected to the protection box (2), and the air delivery pipe (402) is communicated with the air intake channel (4), The absorption box (404) is slidably connected to the protection box (2), the air intake pipe (409) is fixedly connected to the upper inner wall of the absorption box (404), the air intake pipe (409) is connected to the air delivery pipe (402), the partition plate (405) is fixedly connected to the upper inner wall of the absorption box (404), the sponge (406) is fixedly connected to the upper inner wall of the absorption box (404), the exhaust passage (403) is opened in the protection box (2), the exhaust passage (403) is connected to the absorption box (404), the heater is installed in the absorption box (404), and the limestone is arranged in the absorption box (404); A pressure mechanism is arranged on the upper side of the protection box (2); the pressure mechanism is connected to the protection box (2) and can control the movement of the protection box (2).

2. A lithium battery module compression test device according to claim 1, characterized in that: The pressure mechanism comprises a pressure plate (3), a hydraulic cylinder (301), a mounting block (302), a positioning ring plate (202), a detector and two groups of positioning components. The positioning ring plate (202) is fixedly connected to the inner wall of the protection box (2). The pressure plate (3) is slidably connected inside the positioning ring plate (202). The two mounting blocks (302) are respectively fixedly connected to the upper surfaces of the two top plates (104). The hydraulic cylinder (301) is fixedly connected to the upper ends of the two mounting blocks (302). The extended end of the hydraulic cylinder (301) movably penetrates the inner wall of the protection box (2) and is fixed to the upper end of the pressure plate (3). The detector is installed in the pressure plate (3). The two groups of positioning components are both arranged in the positioning ring plate (202). The two groups of positioning components are both connected to the pressure plate (3).

3. A lithium battery module compression test device according to claim 2, characterized in that: Each group of the positioning components comprises an elastic groove (7), a first spring (701) and a positioning block (702); a plurality of the first springs (701) are provided; the elastic groove (7) is opened in the positioning ring plate (202); the positioning block (702) is slidably connected in the elastic groove (7); the plurality of the first springs (701) are fixedly connected to the inner wall of the elastic groove (7); and the plurality of the first springs (701) are fixed to one end of the positioning block (702).

4. A lithium battery module compression test device according to claim 3, characterized in that: A sealing plate (201) is fixedly connected to the inner wall of the protection box (2), and a sealing groove (103) is provided on the upper surface of the test bench (1), wherein the sealing groove (103) matches the sealing plate (201).

5. A lithium battery module compression test device according to claim 4, characterized in that: Both sides of the lower end of the test bench (1) are fixedly connected to water tanks (6).

6. A lithium battery module compression test device according to claim 5, characterized in that: A plurality of connecting mechanisms are provided in the sealing groove (103), and each connecting mechanism comprises a connecting pipe (8), a connecting hole (801), a sliding groove (802), a slider (803), a sliding rod (804) and a second spring (805). Two connecting holes (801), sliding groove (802), slider (803), sliding rod (804) and second spring (805) are provided. The connecting pipe (8) is slidably connected in the test bench (1), the connecting pipe (8) is connected to the water tank (6), and the two connecting holes (801) are both provided in the connecting pipe. (8) on the upper and lower sides, the two sliding grooves (802) are both opened in the test bench (1), the two sliding rods (804) are respectively fixedly connected to the inner walls of the two sliding grooves (802), the two sliding blocks (803) are both fixedly connected to the circumferential surface of the connecting tube (8), the two sliding blocks (803) are respectively slidably connected to the circumferential surfaces of the two sliding rods (804), the two second springs (805) are respectively sleeved on the circumferential surfaces of the two sliding rods (804), and the two second springs (805) are respectively arranged on the lower sides of the two sliding blocks (803).

7. A lithium battery module compression test device according to claim 6, characterized in that: A water pipe (601) is fixedly connected to the surfaces of the two water tanks (6).

8. A lithium battery module compression test device according to claim 7, characterized in that: Support legs (5) are fixedly connected at the four corners of the lower end of the test bench (1), and two reinforcement beams (501) are respectively fixedly connected to the surfaces of the plurality of support legs (5).

9. A lithium battery module compression test device according to claim 8, characterized in that: A placement plate (101) is fixedly connected to the upper end of the test bench (1), two filter screens (408) are fixedly connected inside the protection box (2), and two handles (407) are fixedly connected to the surfaces of the two absorption boxes (404).

10. A test method for a lithium battery module compression test device, using a lithium battery module compression test device as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1, connecting the water pipe (601) to a water source, then placing the lithium battery module to be subjected to a compression test on the surface of the placement plate (101), controlling the operation of the hydraulic cylinder (301), and the extended end of the hydraulic cylinder (301) drives the protection box (2) to move downward to the upper surface of the test bench (1); the sealing plate (201) slides into the sealing groove (103), the lower end of the sealing plate (201) contacts the upper end of the connecting pipe (8), driving the connecting pipe (8) to overcome the elastic force of the second spring (805), so that the connecting hole (801) located at the lower side contacts the inside of the water tank (6), and the water source in the water tank (6) passes through the connecting hole (801) and the connecting pipe (8) and then flows into the sealing groove (103) from the connecting hole (801) located at the upper side, and performs a water seal treatment on the connection between the sealing plate (201) and the sealing groove (103); S2, continue to control the extended end of the hydraulic cylinder (301) to drive the pressing plate (3) to move downward, the pressing plate (3) squeezes the positioning block (702), overcomes the elastic force of the first spring (701) and causes the positioning block (702) to slide into the elastic groove (7), the pressing plate (3) contacts the surface of the lithium battery module to be tested, and continues to squeeze the lithium battery. The pressure magnitude is recorded by the detector during this process. When the lithium battery module is squeezed to a certain extent, a short circuit occurs inside the lithium battery module and spontaneous combustion occurs; S3, the air pump (401) is operated to pump the carbon monoxide gas generated by the spontaneous combustion of the lithium battery module into the limestone through the air inlet channel (4), the air delivery pipe (402) and the air inlet pipe (409). The heater heats the limestone, and the carbon monoxide reacts with the limestone to produce calcium carbonate. The carbon monoxide in the gas is filtered, and the filtered gas is discharged into the outside air through the exhaust channel (403) until the pressure test of the lithium battery module is completed.

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