Universal lithium battery cover plate explosion-proof valve pressure detection device

Abstract

A universal lithium battery cover plate explosion-proof valve pressure detection device disclosed by the present invention comprises an upper cavity and a lower cavity, the lower cavity comprises a bottom plate, a first side plate and a second side plate, a groove is formed in the center of the bottom plate, a first screw rod is arranged in the groove, one end of the first screw rod penetrates through the first side plate, and the other end of the first screw rod is provided with a sliding block. The sliding block can move in the groove by rotating the first screw rod, a through hole is formed in the second side plate, the through hole is externally connected with a high-pressure gas channel and a pressure detection device, side face supporting plates are arranged on the two sides of the lower cavity, each side face supporting plate comprises a fixed plate and a sliding plate, and a movable pushing mechanism is arranged between the fixed plate and the sliding plate. The device is simple in structure and small in size, and can be movably placed in a required high-low temperature or high-low pressure environment; square aluminum shell cover plates with different shapes and different volumes can be fixed on the device through three-way lock catches, and the explosion-proof valve and the device form a closed space.

Description

Technical Field

[0001] The invention relates to the technical field of pressure detection of explosion-proof valves on lithium battery cover plates, and in particular to a universal pressure detection device for explosion-proof valves on lithium battery cover plates. Background Art

[0002] The lithium battery explosion-proof valve is a safety device that is mainly used to prevent lithium batteries from exploding or catching fire in the event of overcharging, short circuit or other faults. Its working principle is that when the internal pressure of the battery exceeds the safety threshold, the explosion-proof valve will automatically open and release gas to reduce the internal pressure and prevent the battery from rupturing or exploding. This device is crucial in the design of lithium batteries, especially in applications such as electric vehicles and electronic devices.

[0003] In actual applications, explosion-proof valves may face complex environments such as extreme temperature, pressure, and corrosive gases. However, current test conditions may not be able to fully simulate these real-world conditions, resulting in test results that cannot accurately reflect their actual performance.

[0004] Each type of cover plate requires a dedicated explosion-proof valve detection device to be designed specifically. The incompatibility between molds leads to a high idle rate of the device. Testing different cover plates requires the development of different detection molds, which consumes a lot of testing costs and time.

[0005] The equipment for testing explosion-proof valves needs to be highly accurate and reliable. However, the external press of the current explosion-proof valve detection device changes with the air pressure and cannot display the maximum pressure of the measurement process, resulting in measurement errors and affecting the accuracy of the test results.

[0006] Explosion-proof valves in actual use may be affected by many factors (such as wear, fatigue, corrosion, etc.) during long-term use, and short-term laboratory tests may not be able to simulate these long-term effects, which leads to a gap between the test results and the performance in actual applications. Summary of the invention

[0007] The purpose of the present invention is to provide a universal lithium battery cover explosion-proof valve pressure detection device to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a universal lithium battery cover explosion-proof valve pressure detection device, including an upper cavity and a lower cavity, the lower cavity including a bottom plate and a first side plate and a second side plate, a groove is provided in the center of the bottom plate, a first screw is provided in the groove, one end of the first screw passes through the first side plate, and a slider is provided at the other end, and the slider can be moved in the groove by rotating the first screw, a through hole is provided on the second side plate, and the through hole is externally connected to a high-pressure gas channel and a pressure detection device, side support plates are provided on both sides of the lower cavity, the side support plates include a fixed plate and a sliding plate, and a moving propulsion mechanism is provided between the fixed plate and the sliding plate.

[0008] Preferably, the upper cavity includes a fixing frame, the four corners of the fixing frame are provided with push screws, the tops of the first side plate and the second side plate are provided with a plurality of threaded holes, the ends of the push screws are inserted into the threaded holes, and a stop block is provided at the bottom of the fixing frame.

[0009] Preferably, a second screw is provided between the side support plates, both ends of the second screw pass through the side support plates, a positioning pin is provided in the middle, and the positioning pin is inserted into the groove to ensure that the two side support plates are relatively parallel.

[0010] Preferably, the mobile propulsion mechanism comprises an L-shaped connecting rod, one end of which is fixed in the fixed plate, and the other end is provided with a threaded opening, a third screw is provided in the threaded opening, and the other end of the third screw is against the sliding plate.

[0011] Preferably, a front pressing plate is provided on the inner side of the first side plate, a fourth screw is provided on the first side plate, and an end of the fourth screw abuts against the front pressing plate.

[0012] Preferably, rubber pads are provided on the inner sides of the front pressing plate and the second side plate, and holes corresponding to the through holes are opened on the rubber pads on the inner side of the second side plate.

[0013] Preferably, rubber pads are provided on the tops of the side support plates.

[0014] Compared with the prior art, the invention has the following beneficial effects: the invention has novel design, small device size, can be moved and placed in a desired high and low temperature or high and low pressure environment, and the gas pipeline can be fed with air, inert gas or corrosive gas; Square aluminum shell covers of different sizes can use this device to test the pressure of explosion-proof valves. They are fixed on the device through a three-way lock, and the explosion-proof valve and the device form a closed space. The disassembled cover plate can be polished and used to measure the explosion pressure of the explosion-proof valve, which is of great reference significance for the safety of the battery cell in the later period of its life. The device can be placed in a complex environment with different temperatures and pressures, and different gases can be introduced to measure the burst pressure, simulating the actual usage scenario to the greatest extent, making the test data more reliable. The pressure display can show the maximum pressure value of the entire test process to reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is an exploded view of the structure of the present invention; Figure 3 It is a schematic diagram of the lower cavity structure of the present invention; Figure 4It is a schematic diagram of the structure of the side support plate and the second screw rod in the present invention; Figure 5 It is a schematic diagram of the structure of the side support plate in the present invention; Figure 6 It is a schematic diagram of the upper cavity structure of the present invention; Figure 7 This is a schematic diagram of the placement position of the cover plate when the pressure test is performed in the present invention; In the figure, the upper cavity -1, the fixing frame -11, the pushing screw -12, the threaded hole -13, the stop block -14, the lower cavity -2, the bottom plate -21, the first side plate -22, the second side plate -23, the groove -24, the first screw -25, the slider -26, the through hole -27, the side support plate -3, the fixing plate -31, the sliding plate -32, the L-shaped connecting rod -33, the third screw -34, the second screw -35, the positioning pin -36, the front clamping plate -4, the fourth screw 41, the rubber pad -5, and the cover plate -6. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1 The present invention provides a technical solution: a universal lithium battery cover explosion-proof valve pressure detection device, comprising an upper cavity 1 and a lower cavity 2, the lower cavity 2 comprising a bottom plate 21 and a first side plate 22, and a second side plate 23, the bottom plate 21 having a groove 24 in the center, a first screw 25 in the groove 24, the groove 24 being used to position the first screw 25, one end of the first screw 25 passing through the first side plate 22, and a slider 26 in the other end, the slider 26 can be moved in the groove 24 by rotating the first screw 25, a through hole 27 is opened on the second side plate 23, the through hole 27 is externally connected to a high-pressure gas channel and a pressure detection device, the pressure detection device can be a pointer type, a digital display type or other instrument for detecting gas pressure.

[0018] The upper cavity 1 includes a fixing frame 11, and the four corners of the fixing frame 11 are each provided with a push screw 12. The tops of the first side plate 22 and the second side plate 23 are each provided with a plurality of threaded holes 13. The ends of the push screws 12 are inserted into the threaded holes 13. Rotating the push screws 12 can control the up and down movement and disassembly of the upper cavity 1. A stop block 14 is provided at the bottom of the fixing frame 11. The stop block 14 is detachable and can be installed or adsorbed on the fixing frame 11 according to the size and shape of the cover plate. The stop block 14 is used to press the cover plate 6 to be tested to prevent air leakage during pressure detection.

[0019] Side support plates 3 are provided on both sides of the lower cavity 2, and rubber pads 5 are provided on the tops of the side support plates 3. The side support plates 3 include fixed plates 31 and sliding plates 32. The fixed plates 31 are divided into various length specifications and can be replaced according to cover plates 6 of different sizes. The total length of the sliding plate 32 should be greater than its propulsible length.

[0020] A movable propulsion mechanism is provided between the fixed plate 31 and the sliding plate 32, and the movable propulsion mechanism includes an L-shaped connecting rod 33, one end of the L-shaped connecting rod 33 is fixed in the fixed plate 31, and the other end is provided with a threaded opening, and a third screw 34 is provided in the threaded opening, and the other end of the third screw 34 is against the sliding plate 32. By rotating the third screw 34, the distance between the fixed plate 31 and the sliding plate 32 is adjusted, thereby adjusting the length of the entire side support plate 3.

[0021] A second screw 35 is provided between the two side support plates 3, both ends of the second screw 35 pass through the side support plates 3, and a positioning pin 36 is provided in the middle position. The positioning pin 36 is inserted into the groove 24 on the bottom plate 21 of the lower cavity 2 to ensure that the two side support plates 3 are relatively parallel. The distance between the two side support plates 3 is determined according to the size of the cover plate to be measured, and the minimum spacing must be greater than the width of the explosion-proof valve.

[0022] A front pressing plate 4 is disposed inside the first side plate 22 . A fourth screw rod 41 is disposed on the first side plate 22 . The end of the fourth screw rod 41 abuts against the front pressing plate 4 .

[0023] The inner sides of the front pressing plate 4 and the second side plate 23 are both provided with rubber pads 5 , and the rubber pads on the inner side of the second side plate 23 are provided with holes corresponding to the through holes 27 .

[0024] When in use, place the cover plate 6 to be tested flat on the side support plate 3, so that the explosion-proof valve is located between the two side support plates 3, one side of the cover plate 6 to be tested is pressed against the rubber pad of the second side plate 23, and the fourth screw 41 is rotated to move the front pressing plate 4 toward the cover plate 6 to be tested until the rubber pad on the front pressing plate 4 is pressed against the other side of the cover plate 6, and the third screw 34 is rotated to make the sliding plate 32 press against the front pressing plate 4, and the first screw 25 is rotated to make the slider 26 close to the positioning pin 36 on the second screw 35 to ensure that there is no air leakage. , rotate the push screw 12 to make the upper cavity 1 press the cover plate 6, thereby forming a closed space surrounded by the two components of the cover plate to be tested and the lower cavity, and the explosion-proof valve is in the closed space. Air, inert gas or corrosive gas is introduced into the closed space through the external pipeline connected to the through hole 27 to pressurize until the explosion-proof valve of the cover plate to be tested is ruptured, and the gas pressure detection meter of the external pipeline is observed. The number displayed on the meter stays at the maximum gas pressure position in the test stage. The number is the bursting pressure value of the explosion-proof valve of the cover plate to be tested.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A universal lithium battery cover explosion-proof valve pressure detection device, comprising an upper cavity (1) and a lower cavity (2), characterized in that: The lower cavity (2) comprises a bottom plate (21), a first side plate (22), and a second side plate (23). A groove (24) is provided at the center of the bottom plate (21). A first screw rod (25) is provided in the groove (24). One end of the first screw rod (25) passes through the first side plate (22), and a slider (26) is provided at the other end. The slider (26) can be moved in the groove (24) by rotating the first screw rod (25). A through hole (27) is provided on the second side plate (23). The through hole (27) is externally connected to a high-pressure gas channel and a pressure detection device. Side support plates (3) are provided on both sides of the lower cavity (2). The side support plates (3) comprise a fixed plate (31) and a sliding plate (32). A moving propulsion mechanism is provided between the fixed plate (31) and the sliding plate (32).

2. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 1, characterized in that: The upper cavity (1) comprises a fixing frame (11), four corners of the fixing frame (11) are provided with push screws (12), the tops of the first side plate (22) and the second side plate (23) are provided with a plurality of threaded holes (13), the ends of the push screws (12) are inserted into the threaded holes (13), and the bottom of the fixing frame (11) is provided with a stop block (14).

3. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 2, characterized in that: A second screw rod (35) is provided between the side support plates (3), both ends of the second screw rod (35) pass through the side support plates (3), and a positioning pin (36) is provided in the middle, and the positioning pin (36) is inserted into the groove (24) to ensure that the two side support plates (3) are relatively parallel.

4. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 3, characterized in that: The moving propulsion mechanism comprises an L-shaped connecting rod (33), one end of the L-shaped connecting rod (33) is fixed in the fixed plate (31), the other end is provided with a threaded opening, a third screw rod (34) is provided in the threaded opening, and the other end of the third screw rod (34) abuts against the sliding plate (32).

5. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 4, characterized in that: A front pressing plate (4) is provided inside the first side plate (22), a fourth screw rod (41) is provided on the first side plate (22), and an end of the fourth screw rod (41) abuts against the front pressing plate (4).

6. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 5, characterized in that: The inner side of the front pressing plate (4) and the inner side of the second side plate (23) are both provided with a rubber pad (5), and the rubber pad on the inner side of the second side plate (23) is provided with a hole corresponding to the through hole (27).

7. The universal lithium battery cover explosion-proof valve pressure detection device according to claim 6, characterized in that: The tops of the side support plates (3) are each provided with a rubber pad (5).

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