Lithium battery top cover pressure resistance test equipment

Abstract

The application discloses a lithium battery top cover pressure resistance test equipment and belongs to the technical field of lithium battery quality test. Mainly including workbench; clamping assembly, clamping assembly has base; test assembly, test assembly includes gland, and multiple groups of air inlet pipes for inflating the gland, the inside of the gland is provided with an air pressure sensor; variable assembly, variable assembly includes a cover, two eccentric wheels are arranged in the cover, a connecting rod is arranged at the eccentric position of the two eccentric wheels, a connecting rod is installed on the connecting rod, and a plug rod is arranged at the bottom of the connecting rod; one side of the cover is provided with a first motor, the output end of the first motor is connected with the eccentric wheel; pressure channel, the bottom of the plug rod is provided with a pressing block, and the pressing block is installed in the pressure channel. The application discloses a lithium battery top cover pressure resistance test equipment, which can simulate the air pressure change of the battery under various working conditions by setting the variable assembly and the lifting assembly which can quickly change the internal air pressure.

Description

Technical Field

[0001] This application relates to the field of lithium battery quality testing technology, specifically a lithium battery top cover pressure resistance testing device. Background Technology

[0002] Battery quality and safety have always been of paramount importance in the lithium battery industry. During repeated charging and discharging, lithium batteries may experience external short circuits, internal short circuits, overcharging, and other phenomena, causing the internal temperature of the battery to rise sharply, the electrolyte to vaporize, and the battery casing to expand, thus causing an explosion. To prevent this from happening, an explosion-proof valve needs to be installed on the lithium battery. When the pressure reaches a certain level, the explosion-proof valve will crack first, playing a role in relieving pressure and thus preventing an explosion.

[0003] As a safety component of the battery, the explosion-proof valve needs to be tested for pressure resistance during the production process. During the test, the top cover of the battery is placed in a pressure chamber, and air is injected into the pressure chamber to cause the explosion-proof valve to rupture. At this time, the internal air pressure of the pressure chamber is recorded by the sensor inside the pressure chamber, thereby measuring the pressure resistance limit of the explosion-proof valve on the top cover of the battery.

[0004] For example, patent CN210375985U discloses a deformation and pressure testing device for lithium battery explosion-proof valves. This patent, through the cooperation of a clamp assembly, a deformation testing assembly, and a pressure testing assembly, can quickly fix the lithium battery. After fixing, the deformation and pressure resistance performance of the lithium battery explosion-proof valve can be tested. The testing work is simple and effective. The entire testing work does not require manual operation. It adopts a mechanized method to test the deformation and pressure resistance of the lithium battery explosion-proof valve, resulting in high testing efficiency.

[0005] In the implementation of the aforementioned patent, although the pressure resistance performance of the lithium battery explosion-proof valve can be tested, in the actual use of lithium batteries, although the internal air pressure environment of the lithium battery is a closed space, the air pressure will change under certain conditions. For example, when the ambient temperature rises or falls, the air pressure will rise or fall accordingly. The aforementioned changing air pressure environment will generate long-term pulse pressure on the explosion-proof valve. The long-term continuous action of this pulse pressure will cause the ultimate pressure resistance strength of the explosion-proof valve to change. However, the existing experimental equipment cannot detect the ultimate pressure resistance strength of the explosion-proof valve in this state. Therefore, it is necessary to provide a lithium battery top cover pressure resistance testing device that can continuously pulse the explosion-proof valve to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a lithium battery top cover pressure resistance testing device, which can continuously pulse the explosion-proof valve before testing to detect the ultimate pressure resistance of the explosion-proof sheet.

[0008] The technical solution adopted by this application to solve its technical problem is: a lithium battery top cover pressure resistance testing device, including a workbench; a clamping assembly disposed on the top of the workbench, the clamping assembly having a base for fixing the lithium battery top cover; a testing assembly disposed on the workbench, the testing assembly including a pressure cap for sealing the lithium battery top cover, and multiple sets of air inlet pipes for inflating the sealed space formed by the pressure cap and the base, the pressure cap having an internal air pressure sensor; and a variable component disposed on the pressure cap, the variable component including a housing, the housing having two sets of eccentric wheels, the two sets of eccentric wheels... A connecting rod is provided at the eccentric position of the wheel, and a connecting rod is installed on the connecting rod. An insert rod is provided at the bottom of the connecting rod. A first motor is installed on one side of the cover, and the output end of the first motor passes through the cover and is connected to the eccentric wheel. A pressure channel is installed on the top of the inner side of the pressure cover, and the bottom of the pressure channel is connected to the internal space of the pressure cover. A pressure block is provided at the bottom of the insert rod, and the pressure block is installed inside the pressure channel. The size of the pressure block is adapted to the internal size of the pressure channel. The first motor drives the pressure block to move within the pressure channel to continuously pulse the explosion-proof disc.

[0009] Furthermore, the clamping assembly includes two sets of slides, which are installed on the top of the worktable. A slider is slidably mounted on the slide, and a base is mounted on the top of the slider. A receiving cavity is provided on the top of the base.

[0010] Furthermore, the test assembly includes multiple sets of columns mounted on the workbench, with a mounting plate mounted on the top of each column, a first cylinder mounted on the top of the mounting plate, the output end of the first cylinder passing through the mounting plate and connected to a fixing plate, and a pressure cap mounted on the bottom of the fixing plate.

[0011] Furthermore, a lifting assembly is provided on one side of the cover. The lifting assembly includes two sets of fixed frames. A slide rail is fixedly installed on the outer side of the fixed frame. A lead screw is installed inside the fixed frame. A second motor is provided on the top of the fixed frame. The output end of the second motor passes through the fixed frame and is connected to the lead screw.

[0012] A movable platform is installed on the slide rail. The side of the movable platform closest to the fixed frame is connected to the lead screw. Two sets of trays are installed on the side of the movable platform away from the fixed frame. Two sets of mounting seats are installed on the top of the trays. The two sets of mounting seats are respectively connected to the two sides of the cover.

[0013] Furthermore, a corrugated tube is provided between the cover and the fixing plate, and the insertion rod is installed inside the corrugated tube, the size of the insertion rod being adapted to the size of the corrugated tube.

[0014] Furthermore, the pressure channel extends downward and is divided into a first channel and a second channel from top to bottom, with the width of the second channel being greater than the width of the first channel.

[0015] Furthermore, a connecting column is fixedly installed at the bottom of the pressure block, and a pressure plate is provided at the bottom of the connecting column. The size of the pressure plate is adapted to the size of the second channel.

[0016] Furthermore, the top of the workbench is provided with multiple sets of second cylinders on both sides of the base, and push plates are installed on the output ends of the second cylinders, with the push plates facing the pressure cover.

[0017] Furthermore, a handle is installed on the outer side of the base.

[0018] Furthermore, the cavity is filled with rubber.

[0019] The beneficial effects of this application are as follows: The lithium battery top cover pressure resistance testing device provided by this application, by setting up a variable component and a lifting component that can quickly change the internal air pressure, the two components cooperate and work together to simulate the air pressure change of the battery under various working conditions, providing a powerful experimental means for the pressure resistance performance testing and safety assessment of explosion-proof sheets.

[0020] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is an overall schematic diagram of a lithium battery top cover withstand voltage testing device according to this application;

[0023] Figure 2 for Figure 1 Schematic diagram of the position of the clamping components;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 for Figure 2 Schematic diagram of the working status of the central inflation component;

[0026] Figure 5 for Figure 4 Internal structure diagram of the intermediate pressure cover;

[0027] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0028] Figure 7 for Figure 6 A schematic diagram of the structure of the variable component;

[0029] Figure 8 for Figure 7 A schematic diagram of the internal structure of the variable component;

[0030] Figure 9 for Figure 6 Schematic diagram of the installation location of the medium pressure channel;

[0031] Figure 10 This is a schematic diagram showing the installation location of the second channel;

[0032] The following are the labeling elements in the figure:

[0033] 1. Testing instrument; 11. Mounting base; 12. Workbench; 13. Second cylinder; 14. Push plate;

[0034] 2. Clamping assembly; 21. Slide rail; 22. Slider; 23. Base; 231. Handle; 24. Receiving cavity;

[0035] 3. Test components; 31. Column; 32. Mounting plate; 33. First cylinder; 34. Fixing plate;

[0036] 4. Inflation assembly; 41. Pressure cap; 42. Air inlet pipe;

[0037] 5. Variable assembly; 51. Housing; 52. Eccentric wheel; 53. Connecting rod; 54. Bellows; 55. Insert rod; 56. First motor; 57. Pressure channel; 571. First channel; 572. Second channel;

[0038] 6. Pressure block; 61. Connecting column; 62. Pressure plate;

[0039] 7. Top cover assembly; 71. Base plate; 72. Positive terminal; 73. Negative terminal; 74. Explosion-proof sheet;

[0040] 8. Lifting assembly; 81. Fixing frame; 811. Slide rail; 82. Lead screw; 83. Second motor; 84. Moving table; 85. Tray; 86. Mounting base. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] like Figure 3 As shown, the top cover in a lithium battery is a key protective structure. This top cover assembly 7 is usually composed of three parts: a base plate 71, a positive terminal 72, a negative terminal 73, and an explosion-proof sheet 74. The positive terminal 72 and the negative terminal 73 are respectively located on both sides of the base plate 71, serving as physical interfaces for energy transmission and conducting the battery cell to the external circuit. The explosion-proof sheet 74 serves as a safety device. When the battery generates excessive gas due to abnormal reactions, causing a sudden increase in internal pressure, the explosion-proof sheet 74 will automatically rupture to form a pressure relief channel, effectively preventing the risk of container explosion.

[0044] However, since lithium batteries may encounter internal gas generation problems caused by mechanical damage, overcharging, or high temperature in practical applications, it is necessary to ensure the reliability of the explosion-proof plate 74 through a pressure resistance test. This test verifies the opening characteristics of the explosion-proof plate 74 at the critical pressure point by simulating the pressure accumulation process under extreme working conditions, thereby ensuring that the battery system can release internal pressure in time under abnormal conditions and avoid the occurrence of explosion accidents.

[0045] Example 1: This example specifically illustrates a lithium battery top cover withstand voltage testing device and its working principle, specifically:

[0046] like Figures 1-4 As shown, this application provides a lithium battery top cover pressure resistance testing device, including a tester 1. The tester 1 is set in a lithium battery manufacturing plant and is used to test the pressure resistance of the top cover assembly 7 after production. The tester 1 includes a fixed base 11, which is installed on the ground. A workbench 12 is set on the top of the fixed base 11. A clamping assembly 2 is set on the workbench 12, and the clamping assembly 2 holds the top cover assembly 7 to be tested.

[0047] The clamping assembly 2 includes two sets of slides 21, which are fixedly installed on the top of the workbench 12. A slider 22 is slidably installed on the slide 21, and a base 23 is fixedly installed on the top of the slider 22. A handle 231 is fixedly installed on the outside of the base 23 to facilitate the operator's movement and adjustment. A receiving cavity 24 is provided on the top of the base 23. The receiving cavity 24 is filled with rubber according to the shape and size of the top cover assembly 7 to ensure that the top cover assembly 7 to be tested can fit tightly and prevent displacement or air leakage during the test.

[0048] Meanwhile, a test assembly 3 is also provided on one side of the clamping assembly 2. The test assembly 3 includes multiple sets of columns 31 fixedly mounted on the workbench 12. A mounting plate 32 is fixedly mounted on the top of the column 31, and two sets of first cylinders 33 are fixedly mounted on the top of the mounting plate 32. The output end of the first cylinder 33 passes through the mounting plate 32 and is connected to a fixing plate 34. An inflation assembly 4 is provided on the fixing plate 34. The inflation assembly 4 is adapted to approach and contact the base 23 under the drive of the two sets of first cylinders 33. The inflation assembly 4 is used to apply controllable air pressure to the top cover assembly 7, thereby measuring the burst limit value of the explosion-proof sheet 74 under different air pressures.

[0049] The inflation assembly 4 includes a pressure cap 41 fixedly installed at the bottom of the fixing plate 34. The inner side of the pressure cap 41 is hollow, and the size of the bottom of the pressure cap 41 is adapted to the size of the top of the base 23. This allows the pressure cap 41 to completely overlap with the base 23 without leaving any gaps when it comes into contact with the base 23 under the action of the first cylinder 33, forming a closed test space. A high-precision air pressure sensor is also installed inside the pressure cap 41. The air pressure sensor has a small package size, which is easy to integrate into the inside of the pressure cap 41 without taking up too much space. It has a wide measurement range, which can meet the monitoring needs of different air pressure ranges in the pressure resistance test of the lithium battery top cover. The air pressure sensor has high measurement accuracy and can accurately capture the subtle changes in air pressure inside the pressure cap 41 for real-time monitoring of air pressure changes inside the pressure cap 41, ensuring the accuracy of the test data.

[0050] Meanwhile, in order to keep the pressure cap 41 stable during testing, multiple sets of second cylinders 13 are also provided on both sides of the base 23 at the top of the workbench 12. A push plate 14 is fixedly installed on the output end of the second cylinder 13. The push plate 14 is set towards the pressure cap 41 and is adapted to contact the pressure cap 41 during testing under the drive of the second cylinder 13, so that the pressure cap 41 remains stable and does not shake.

[0051] Meanwhile, multiple sets of air inlet pipes 42 are provided on the outside of the pressure cover 41 near the top. The end of the air inlet pipe 42 away from the pressure cover 41 is connected to an external air pump. The air inlet pipe 42 is adapted to introduce test gas into the pressure cover 41 to test the maximum pressure that the explosion-proof sheet 74 can withstand.

[0052] When a pressure test is required on the explosion-proof sheet 74 in the top cover assembly 7, the operator first places the base plate 71 into the receiving cavity 24 on the base 23. Since the receiving cavity 24 is filled with rubber, it has good elasticity and sealing properties. Therefore, the base plate 71 can be tightly inserted into the receiving cavity 24 during the test without leaving any gaps, effectively preventing other air from entering between the base plate 71 and the receiving cavity 24, ensuring the accuracy of the test. Then, the operator moves the base 23 on the slide 21 to the test position of the inflation assembly 4 by using the handle 231. Then, the operator controls the first cylinder 33 to make the pressure cover 41 in close contact with the base 23, and starts the two sets of second cylinders 13 to drive the push plate 14 to fix the pressure cover 41 firmly.

[0053] Finally, the gas is pumped into the pressure cap 41, causing the internal pressure of the pressure cap 41 to gradually increase. At this time, the pressure sensor will sense the change in pressure in real time and convert it into a corresponding electrical signal and transmit it to the control system. During this process, the operator can observe the real-time value and change curve of the pressure through the display screen of the test equipment.

[0054] As the test progresses, when the air pressure inside the pressure cap 41 rises to the withstand limit of the explosion-proof disc 74, the explosion-proof disc 74 will rupture. At this time, the air pressure inside the pressure cap 41 will drop rapidly. The air pressure sensor will immediately detect the rapid change in air pressure and transmit this signal to the control system. After receiving the signal, the control system will record the air pressure value at this time, that is, the rupture pressure of the explosion-proof disc 74, stop the test process, and display and store the test results.

[0055] In the actual use of lithium batteries, although the internal air pressure environment of lithium batteries is a closed space, the air pressure will change under certain conditions. For example, when the ambient temperature rises, the solubility of gas inside the battery will decrease, and some gas may be released, causing the air pressure to rise. Conversely, when the temperature drops, the air pressure will drop. The aforementioned changing air pressure environment will generate long-term pulse pressure on the explosion-proof sheet 74. The long-term continuous action of this pulse pressure will cause the ultimate pressure resistance of the explosion-proof sheet 74 to change.

[0056] To test the ultimate pressure resistance of the explosion-proof disc 74 under the above conditions, such as Figures 6-8 As shown, a variable component 5 is also provided in the inflation component 4. The variable component 5 is used to change the air pressure in the pressure cap 41, thereby testing whether the explosion-proof sheet 74 is affected by the long-term action of pulse air pressure on its ultimate pressure resistance performance.

[0057] The variable component 5 includes a housing 51, the interior of which is hollow, and two sets of eccentric wheels 52 are provided inside the housing 51. A connecting rod (not shown in the figure) is fixedly installed between the two sets of eccentric wheels 52. The connecting rod is fixed at the eccentric position of the eccentric wheel 52, and the side of the two sets of eccentric wheels 52 away from the connecting rod is connected to the bearing of the housing 51, so that the two sets of eccentric wheels 52 can rotate synchronously inside the housing 51.

[0058] Meanwhile, a connecting rod 53 is hinged to the connecting rod, and an insert rod 55 is fixedly installed at the bottom of the connecting rod 53. A first motor 56 is fixedly installed on one side of the cover 51. The output end of the first motor 56 passes through the cover 51 and is fixedly connected to one of the eccentric wheels 52. Thus, the first motor 56 can drive the eccentric wheel 52 to rotate. During the rotation of the eccentric wheel 52, due to the eccentric setting of the connecting rod, the insert rod 55 will be driven to perform vertical reciprocating motion.

[0059] like Figures 8-9 As shown, the variable component 5 also includes a pressure channel 57, which is fixedly installed on the top of the inner side of the pressure cover 41. The bottom of the pressure channel 57 is connected to the internal space of the pressure cover 41. At the same time, a pressure block 6 is also provided at the bottom of the insertion rod 55. The pressure block 6 is slidably installed inside the pressure channel 57, and the size of the pressure block 6 is adapted to the size of the inside of the pressure channel 57. This allows the first motor 56 to drive the pressure block 6 to slide back and forth inside the pressure channel 57. When the pressure block 6 slides downward, it will compress the air inside the pressure cover 41, causing the air pressure to rise. When the pressure block 6 slides upward, the air volume inside the pressure cover 41 increases, and the air pressure will decrease. This can simulate the pulse pressure that the explosion-proof sheet 74 is subjected to during actual use.

[0060] It should be noted that the pressure block 6 is located close to the upper end of the explosion-proof sheet 74, so that it can quickly and directly apply pulse impact to the explosion-proof sheet 74. Compared with the method of changing the overall air pressure inside the pressure cover 41 by an external air pump, the space inside the pressure cover 41 is larger, so it cannot act on the explosion-proof sheet 74 in time, thus affecting the effect of the pulse.

[0061] After the number of pulses reaches a preset value, the explosion-proof disc 74 is subjected to an ultimate pressure test to evaluate its ultimate pressure resistance under long-term pulse pressure.

[0062] Example 2: During the packaging of lithium batteries, the internal gas pressure is generally fixed to meet design standards. However, due to uncertainties during packaging, the internal gas pressure fluctuates, resulting in a certain range for the initial gas pressure value. To better simulate the pressure changes inside the lithium battery under this condition, improvements are made to variable component 5, specifically:

[0063] like Figure 6 As shown, a lifting assembly 8 is also provided on one side of the cover 51. The lifting assembly 8 includes two sets of vertically arranged fixed frames 81. A slide rail 811 is fixedly installed on the outer side of the fixed frame 81. Meanwhile, a lead screw 82 is rotatably installed inside the fixed frame 81. A second motor 83 is provided on the top of the fixed frame 81. The output end of the second motor 83 passes through the fixed frame 81 and is fixedly connected to the lead screw 82, so that the lead screw 82 is suitable for rotating under the drive of the second motor 83.

[0064] Meanwhile, a movable stage 84 is slidably mounted on the slide rail 811. The side of the movable stage 84 closest to the fixed frame 81 is threadedly connected to the lead screw 82. Thus, when the second motor 83 drives the lead screw 82 to rotate, it will drive the movable stage 84 to slide on the slide rail 811.

[0065] Meanwhile, two sets of trays 85 are fixedly installed on the side of the moving platform 84 away from the fixed frame 81. Two sets of mounting seats 86 are fixedly installed on the top of the trays 85, and the two sets of mounting seats 86 are fixedly connected to the two sides of the cover 51 respectively. Thus, when the second motor 83 drives the lead screw 82 to rotate, it will drive the cover 51 to move synchronously through the trays 85.

[0066] Meanwhile, a foldable corrugated tube 54 is provided between the cover 51 and the fixing plate 34. The insertion rod 55 is slidably installed in the corrugated tube 54, and the size of the insertion rod 55 is adapted to the size of the corrugated tube 54.

[0067] Furthermore, by moving the cover 51, the initial position of the pressure block 6 inside the pressure channel 57 is changed, causing the initial air pressure inside the pressure cap 41 to rise or fall. Since a freely retractable bellows 54 is provided between the cover 51 and the pressure cap 41, the bellows 54 has good flexibility and sealing performance, which can ensure that the cover 51 moves without any obstruction, while ensuring the sealing performance of the entire system.

[0068] Before pulse testing is required, the lifting component 8 drives the pressure block 6 in the variable component 5 to move within the pressure channel 57, thereby changing the initial position of the pressure block 6 within the pressure channel 57, which in turn increases or decreases the initial gas pressure within the pressure cap 41, thus simulating the internal gas pressure during lithium battery packaging.

[0069] Then, the first motor 56 is started, which drives the pressure block 6 to move back and forth inside the pressure channel 57, thereby rapidly pulse-impacting the explosion-proof sheet 74. When the number of pulses reaches the preset value, the rubber pressure cover 41 is inflated, thereby conducting an extreme pressure test on the explosion-proof sheet 74 to ensure the safe use of the battery.

[0070] Example 3: When a lithium battery malfunctions internally (such as during overcharging), it may generate a large amount of gas, such as hydrogen and oxygen. This leads to an increase in internal gas pressure. Although the gas pressure at this time will not damage the explosion-proof sheet 74, the explosion-proof sheet 74 will be continuously subjected to continuous pulse pressure under this condition. In order to simulate the ultimate pressure resistance performance of the explosion-proof sheet 74 after continuous pulses of high gas pressure, improvements are made to the pressure channel 57, specifically:

[0071] like Figure 10 As shown, the pressure channel 57 is extended downwards by a certain distance and divided into a first channel 571 and a second channel 572 from top to bottom. The width of the second channel 572 is greater than that of the first channel 571. This differentiated design is used to meet the needs of different simulation states. At the same time, a connecting column 61 is fixedly installed at the bottom of the pressure block 6. A pressure plate 62 is provided at the bottom of the connecting column 61. The size of the pressure plate 62 is adapted to the size of the second channel 572 to ensure that precise air pressure control can be achieved during the simulation.

[0072] When it is necessary to simulate the pulse state of the explosion-proof sheet 74 under continuous high pressure, the cover 51 can be moved down by the lifting component 8, which in turn moves the pressure block 6 and the pressure plate 62 downward, so that the pressure plate 62 moves towards the bottom of the second channel 572. At this time, since the width of the second channel 572 is greater than the width of the first channel 571, when the pressure plate 62 moves towards the bottom of the second channel 572 under the action of the lifting component 8, the air in the cover 41 is compressed, resulting in an increase in air pressure.

[0073] Then the first motor 56 can be started, which will drive the pressure plate 62 to move back and forth inside the second channel 572, and rapidly pulse impact the explosion-proof sheet 74 under a large air pressure. When the number of pulses reaches the preset value, air is then pumped into the pressure cover 41 to conduct an extreme pressure test on the explosion-proof sheet 74.

[0074] Then, by using the simulation device designed earlier to create the normal gas pressure state when the battery is working normally and the high gas pressure state formed by the decomposition of electrolyte during overcharging, the ultimate pressure resistance test of the explosion-proof sheet 74 can be carried out according to the standard operating procedures in engineering practice.

[0075] In summary, this device, by incorporating a variable component 5 that can rapidly change the internal air pressure and a lifting component 8, works in coordination with each other to simulate the air pressure changes of the battery under various operating conditions, providing a powerful experimental means for testing the pressure resistance performance and safety assessment of the explosion-proof sheet 74.

[0076] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lithium battery top cover withstand voltage testing device, wherein the battery top cover has an explosion-proof sheet, characterized in that: The lithium battery top cover withstand voltage testing equipment includes: Workbench (12); Clamping assembly (2), which is disposed on the top of the worktable (12), has a base (23) for fixing the top cover of the lithium battery. Test component (3), which is set on the workbench (12), includes a pressure cap (41) for sealing the top cover of the lithium battery, and multiple air inlet pipes (42) for inflating the sealed space formed by the pressure cap (41) and the base (23). The pressure cap (41) is equipped with an air pressure sensor. A variable component (5) is disposed on the cover (41). The variable component (5) includes a cover (51). Two sets of eccentric wheels (52) are disposed inside the cover (51). A connecting rod is disposed at the eccentric position of the two sets of eccentric wheels (52). A connecting rod (53) is installed on the connecting rod. A plug rod (55) is disposed at the bottom of the connecting rod (53). A first motor (56) is installed on one side of the housing (51), and the output end of the first motor (56) passes through the housing (51) and is connected to the eccentric wheel (52). Pressure channel (57) is installed on the top of the inner side of the pressure cover (41). The bottom of the pressure channel (57) is connected to the internal space of the pressure cover (41). A pressure block (6) is provided at the bottom of the insertion rod (55). The pressure block (6) is installed inside the pressure channel (57). The size of the pressure block (6) is adapted to the size inside the pressure channel (57). The first motor (56) drives the pressure block (6) to move within the pressure channel (57) to continuously pulse the explosion-proof sheet; A lifting assembly (8) is provided on one side of the cover (51); The pressure channel (57) extends downward and is divided from top to bottom into a first channel (571) and a second channel (572), wherein the width of the second channel (572) is greater than the width of the first channel (571); A connecting column (61) is fixedly installed at the bottom of the pressure block (6), and a pressure plate (62) is provided at the bottom of the connecting column (61). The size of the pressure plate (62) is adapted to the size of the second channel (572). The lifting assembly (8) drives the cover (51) to move downward, and the pressure block (6) and the pressure plate (62) move downward, so that the pressure plate (62) moves toward the bottom of the second channel (572). Since the width of the second channel (572) is greater than the width of the first channel (571), when the pressure plate (62) moves toward the bottom of the second channel (572) under the drive of the lifting assembly (8), the air in the cover (41) is compressed, resulting in an increase in air pressure.

2. The lithium battery top cover withstand voltage testing device according to claim 1, characterized in that: The clamping assembly (2) includes two sets of slides (21), the slides (21) are installed on the top of the worktable (12), a slider (22) is slidably installed on the slides (21), a base (23) is installed on the top of the slider (22), and a receiving cavity (24) is provided on the top of the base (23).

3. The lithium battery top cover withstand voltage testing device according to claim 1, characterized in that: The test assembly (3) includes multiple sets of columns (31) installed on the workbench (12). A mounting plate (32) is installed on the top of the column (31). A first cylinder (33) is installed on the top of the mounting plate (32). The output end of the first cylinder (33) passes through the mounting plate (32) and is connected to a fixing plate (34). The pressure cap (41) is installed at the bottom of the fixing plate (34).

4. The lithium battery top cover withstand voltage testing device according to claim 3, characterized in that: A corrugated pipe (54) is provided between the cover (51) and the fixing plate (34), and the insertion rod (55) is installed inside the corrugated pipe (54). The size of the insertion rod (55) is adapted to the size of the corrugated pipe (54).

5. The lithium battery top cover withstand voltage testing device according to claim 1, characterized in that: The lifting assembly (8) includes two sets of fixed frames (81). A slide rail (811) is fixedly installed on the outside of the fixed frame (81). A lead screw (82) is installed inside the fixed frame (81). A second motor (83) is provided on the top of the fixed frame (81). The output end of the second motor (83) passes through the fixed frame (81) and is connected to the lead screw (82). A movable stage (84) is installed on the slide rail (811). The movable stage (84) is connected to the lead screw (82) on the side closer to the fixed frame (81). Two sets of trays (85) are installed on the side of the movable stage (84) away from the fixed frame (81). Two sets of mounting seats (86) are installed on the top of the trays (85). The two sets of mounting seats (86) are respectively connected to the two sides of the cover (51).

6. The lithium battery top cover withstand voltage testing device according to claim 1, characterized in that: The top of the workbench (12) is located on both sides of the base (23) and multiple sets of second cylinders (13) are provided. A push plate (14) is installed on the output end of the second cylinder (13) and the push plate (14) is positioned towards the pressure cover (41).

7. The lithium battery top cover withstand voltage testing device according to claim 2, characterized in that: A handle (231) is installed on the outside of the base (23).

8. The lithium battery top cover withstand voltage testing device according to claim 2, characterized in that: The cavity (24) is filled with rubber.

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