Power lithium battery top cover detection device

Abstract

The invention discloses a power lithium battery top cover detection device, and belongs to the technical field of lithium battery cover detection. The device mainly comprises a workbench; the placing mechanism is provided with a placing platform for supporting the lithium battery top cover and a spring damper for supporting the placing platform; the sealing mechanism is provided with a sealing cover for sealing the top cover of the lithium battery, a booster pump for inflating the sealed space and a first spring for supporting the sealing cover; the downward pressing mechanism is provided with a first air cylinder; the side plate is provided with a control plate, the control plate is provided with a first slide way, the first slide way is provided with a second slide way, and the second slide way is provided with a third slide way; the hinge seat is provided with a control rod, and the control rod is provided with a control ball. According to the detection device for the top cover of the power lithium battery, the top cover of the lithium battery is sealed through the sealing mechanism, and the sealing mechanism can be tightly pressed through the pressing mechanism, so that the blasting conditions of an anti-explosion piece on the top cover of the lithium battery in different states under the actual condition can be simulated and detected.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery cover detection, and specifically to a power lithium battery top cover detection device. Background Art

[0002] Lithium batteries are batteries that use lithium metal or lithium alloy as anode materials and non-aqueous electrolyte solutions. Lithium batteries include a cover structure, which includes a positive electrode column, a conductive sheet, a top cover sheet, and a plastic cover. The conductive sheet is connected to the positive electrode column, the positive electrode column is insulated from the top cover sheet, and the plastic cover is connected to the top cover sheet. During the use of lithium batteries, sometimes the external environment causes adverse reactions inside, resulting in increased internal pressure and expansion, and even explosion in severe cases, which poses a great safety hazard. Therefore, it is necessary to perform a burst test on the explosion-proof disk on the top cover of the lithium battery. The burst test can ensure that the explosion-proof disk is accurately opened at the predetermined pressure, and the internal pressure is released in time to avoid explosion accidents. When performing a burst test on a lithium battery top cover explosion-proof disc, the battery top cover explosion-proof disc to be tested is placed in a special fixture, and then the relevant parameters are set on the burst tester according to the test requirements and the specifications of the explosion-proof disc, including the maximum burst pressure value, test time, pressure loading rate, etc. The test instrument is started, and the test cavity is slowly pressurized through the air source system to gradually increase the pressure on the explosion-proof disc. When the explosion-proof disc explodes, the instrument will immediately stop pressurizing and record the highest pressure value at this time, which is the burst pressure of the explosion-proof disc; However, in the traditional battery top cover explosion-proof disk explosion test, the test is mainly carried out by applying a stable pressure to the explosion-proof disk. This method is different from the complex dynamic process of the explosion-proof disk explosion caused by abnormal internal pressure of the actual battery. In actual situations, the change of internal pressure of the battery is a dynamic process, which may be accompanied by vibration and other conditions, which will affect the explosion characteristics of the explosion-proof disk. Therefore, it is necessary to provide a power lithium battery top cover detection device to solve the above problems.

[0003] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0004] Based on the above problems existing in the prior art, the problem to be solved by the present application is to provide a power lithium battery top cover detection device to simulate and detect the explosion of the explosion-proof plate on the lithium battery top cover under different conditions in real situations.

[0005] The technical solution adopted by the present application to solve its technical problems is: a power lithium battery top cover detection device, comprising a workbench; a placement mechanism, which is arranged at the upper end of the workbench, and has a placement platform for supporting the lithium battery top cover, and multiple groups of spring dampers for supporting the placement platform; a sealing mechanism, which is installed on the workbench, and has a sealing cover for sealing the lithium battery top cover, and multiple groups of booster pumps for inflating the sealed space composed of the sealing cover and the placement platform, and a first spring for supporting the sealing cover; a pressing mechanism, which is installed on the workbench, and has a first cylinder for pressing the sealing cover; a side A plate, which is installed on the side of the sealing cover, and a control panel is installed at one end of the side panel, and the control panel has a first slide opened vertically, and the first slide is connected to a second slide, and the second slide is connected to a third slide; an articulated seat, which is installed on the workbench, and a control rod is hinged on the articulated seat, and the control rod has a control ball adapted to the slide, and the control ball is made of elastic material; wherein, a protruding block is installed on the control panel, and the protruding block and the third slide form a retention point for the control ball to stay, and the retention point is provided with a second switch; two sets of bases are installed on the workbench, and a motor is installed on the side of the base, and a cam is installed on the output end of the motor.

[0006] Furthermore, the bottom position of the second slide is lower than the bottom position of the first slide, the bottom position of the third slide is lower than the bottom position of the second slide, there is a first step between the third slide and the second slide, and a first vertex is provided at the connection between the third slide and the second slide, and the first vertex is located in the third slide.

[0007] Furthermore, a fourth slide is connected to the third slide, a groove bottom position of the fourth slide is lower than a groove bottom position of the third slide, and a second step is provided between the fourth slide and the third slide.

[0008] Furthermore, a second mounting plate is installed on a side of the control panel away from the first slide, and a second cylinder is installed on the second mounting plate. The telescopic end of the second cylinder is connected to the protruding block, and the protruding block is suitable for forming a sixth slide for the control ball to pass through with the third slide when the telescopic end of the second cylinder is reset.

[0009] Furthermore, one end of the spring damper is fixedly connected to the workbench, the base has a supporting step, a limiting rod is installed on the base, and a through hole matching the diameter of the limiting rod is opened on the side plate.

[0010] Furthermore, a fifth slide is connected to the fourth slide, the bottom height of the fifth slide is lower than the bottom height of the fourth slide, a third step is provided between the fourth slide and the fifth slide, and a second vertex is provided at the connection between the fourth slide and the fifth slide.

[0011] Furthermore, the fifth slide is connected to the first slide, and a transition slope is provided at the connection between the fifth slide and the first slide. The transition slope gradually increases along the position close to the first slide, and the highest position of the transition slope is higher than the bottom position of the groove of the first slide and forms a fourth step. The fourth step is used to limit the initial movement of the control ball.

[0012] Furthermore, a first switch is provided in the first slideway, the first switch controls the motor to be turned off, and the second switch controls the motor to be started.

[0013] Furthermore, the sealing mechanism includes a fixed seat installed on the workbench, a mounting back plate is installed on the fixed seat, two groups of slide rails are installed on the side of the mounting back plate close to the placement platform, sliders are slidably installed on the slide rails, a sliding frame is connected between the two groups of sliders, a card slot adapted to the bottom of the sealing cover is opened on the placement platform, a hose is threadedly connected to the boost pump, the hose is suitable for connecting with an external air supply device, a pressure sensor is installed in the inner cavity of the sealing cover, and the pressure sensor is electrically connected to the control system.

[0014] Furthermore, the pressing mechanism includes a support seat installed on the workbench, a pressing plate is installed at the telescopic end of the first cylinder, and a pressing rod is installed at one end of the pressing plate.

[0015] The beneficial effect of the present application is that the present application provides a power lithium battery top cover detection device, which seals the lithium battery top cover through a sealing mechanism to provide an inflation space, and the sealing mechanism can be pressed down on a placement platform through a pressing mechanism to simulate and detect the inflation pressure explosion of the explosion-proof plate on the lithium battery top cover under different conditions in real situations.

[0016] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is an overall schematic diagram of a power lithium battery top cover detection device in this application; Figure 2 for Figure 1 Schematic diagram of the downward pressing mechanism structure; Figure 3 for Figure 2 Schematic diagram of the local structure; Figure 4 for Figure 3 Side view of Figure 5 for Figure 3 Schematic diagram of point A; Figure 6 for Figure 4 Schematic diagram of point B; Among them, the reference numerals in the figure are: 1. Test equipment; 101. Control system; 102. Workbench; 2. Placement mechanism; 201. Placement platform; 202. Card slot; 203. Base; 204. Limiting rod; 205. First mounting plate; 206. Spring damper; 3. Pressing mechanism; 301. Support seat; 302. First cylinder; 303. Pressing plate; 305. Pressing rod; 4. Sealing mechanism; 401. Fixed seat; 402. Mounting back plate; 403. Slide rail; 404. Slider; 405. First spring; 406. Sealing cover; 407. Booster pump; 408. Hose; 409. Side plate; 410. Motor; 411. Cam; 412. Control board; 413. First slideway; 414. Second slideway; 415. First vertex; 416. Third slideway; 417. Stay point; 418. Fourth slideway; 419. Second vertex; 420. Fifth slideway; 421. Second mounting plate; 422. Second cylinder; 423. Protruding block; 424. Articulated seat; 425. Control rod; 426. Sliding frame; 5. Lithium battery top cover; 501. Positive pole; 502. Negative pole; 503. Explosion-proof plate. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0020] like Figure 3 As shown, the lithium battery top cover 5 is an important component of the lithium battery, wherein the lithium battery top cover 5 is mainly composed of a positive pole 501, a negative pole 502 and an explosion-proof plate 503. The pole is a channel connecting the inside and outside of the battery. The explosion-proof plate 503 is suitable for when a large amount of gas is generated inside the battery due to various reasons and the internal pressure of the battery rises sharply to a certain threshold, the explosion-proof plate 503 opens and releases the internal pressure of the battery; During the use of lithium batteries, sometimes the external environment may cause adverse reactions inside, resulting in increased internal pressure and expansion, and even explosion in severe cases, which poses a great safety hazard. Therefore, it is necessary to perform a burst test on the explosion-proof disc 503 on the lithium battery top cover 5. The burst test can ensure that the explosion-proof disc 503 is accurately opened at a predetermined pressure, and the internal pressure is released in time to avoid the occurrence of explosion accidents.

[0021] Embodiment 1: This embodiment describes the structure and working principle of a power lithium battery top cover detection device, specifically: like Figure 1-Figure 4 As shown, the present application provides a power lithium battery top cover detection device, including a test device 1, the test device 1 includes a workbench 102, and a control system 101 is installed on the workbench 102, the control system 101 is used to control the operation between devices, and a placement mechanism 2 is installed on the test device 1, the placement mechanism 2 is used to place the lithium battery top cover 5 to be tested; The placement mechanism 2 includes a placement platform 201 disposed at the upper end of the workbench 102, on which the lithium battery top cover 5 can be placed, and first mounting plates 205 are fixedly mounted on both sides of the placement platform 201, and multiple groups of spring dampers 206 are fixedly mounted on the first mounting plates 205, one end of the spring damper 206 is fixedly connected to the workbench 102, and the spring damper 206 is used to support the placement platform 201, so that the placement platform 201 is suitable for being squeezed to compress the spring damper 206; like Figure 2-Figure 4 As shown, a sealing mechanism 4 is installed on the workbench 102, and the sealing mechanism 4 is used to seal the lithium battery top cover 5, and the sealing mechanism 4 includes a fixed seat 401 fixedly installed on the workbench 102, and a mounting back plate 402 is fixedly installed on the fixed seat 401, and two groups of slide rails 403 are fixedly installed on the side of the mounting back plate 402 close to the placement platform 201, and a slider 404 is slidably installed on the slide rail 403, and a sliding frame 426 is connected between the two groups of sliders 404, and the sliding frame 426 is suitable for sliding along the linear direction of the slide rail 403 through the slider 404 to adjust the position of the slider 404 on the slide rail 403; A sealing cover 406 is fixedly mounted on the side of the sliding frame 426, and a card slot 202 adapted to the bottom of the sealing cover 406 is opened on the placement platform 201, so that the sliding frame 426 is suitable for moving with the movement of the slider 404, and the sealing cover 406 is suitable for synchronously moving with the movement of the sliding frame 426, so as to achieve the bottom end of the sealing cover 406 being covered in the card slot 202 to seal the lithium battery top cover 5, or to open the lithium battery top cover 5 away from the placement platform 201; A plurality of booster pumps 407 are fixedly connected to the sealing cover 406, and a hose 408 is threadedly connected to the booster pump 407. The hose 408 is suitable for communicating with an external air supply device to inflate the sealed space formed by the sealing cover 406 and the placement platform 201; Meanwhile, a pressure sensor (not shown in the figure) is fixedly installed in the inner cavity of the sealing cover 406, and the pressure sensor is electrically connected to the control system 101, and the pressure sensor is used to monitor the pressure value in the sealed space in real time, and feed back to the control system 101, and a first spring 405 is fixedly installed on the sealing cover 406, one end of the first spring 405 is connected to the mounting back plate 402, and the first spring 405 is used to support the sealing cover 406; like Figure 2-Figure 3 As shown, a pressing mechanism 3 is installed on the workbench 102 and just above the sealing cover 406. The pressing mechanism 3 is used to press the sealing cover 406 onto the workbench 102, and the pressing mechanism 3 includes a support seat 301 fixedly installed on the workbench 102, and a first cylinder 302 is fixedly installed on the support seat 301, and the telescopic end of the first cylinder 302 movably penetrates the support seat 301, and a pressing plate 303 is fixedly installed at the telescopic end of the first cylinder 302, and a pressing rod 305 is fixedly installed at one end of the pressing plate 303; The pressing rod 305 is adapted to contact the upper surface of the sealing cover 406 under the action of the first cylinder 302, so as to push the sealing cover 406 downward to be tightly pressed on the placement platform 201, and after the telescopic end of the first cylinder 302 is reset, the sealing cover 406 is restored to the initial position under the action of the first spring 405; Thus, when the telescopic end of the first cylinder 302 presses the sealing cover 406 downward, the spring damper 206 is gradually compressed, and the first spring 405 is gradually stretched. When the first cylinder 302 pushes the sealing cover 406 downward for a specified distance, the sealing cover 406 is moved upward for a certain distance under the action of the spring damper 206 and the first spring 405. In summary, during the test, the lithium battery top cover 5 is first installed on the placement platform 201, and then a reasonable bursting pressure limit is set according to the design specifications and use requirements of the explosion-proof disk 503 on the lithium battery top cover 5, and the inflation time is reasonably set according to factors such as the pressurization rate and sample characteristics, and then the test equipment 1 is turned on, and the pressure plate 303 is driven to move downward by the first cylinder 302, and the pressure plate 303 drives the sealing cover 406 to move downward through the pressure rod 305 until the bottom end of the sealing cover 406 is pressed in the slot 202 on the placement platform 201, and then the booster pump 407 slowly fills the sealed space where the lithium battery top cover 5 is installed with gas. During the inflation process, the pressure value in the sealed space is monitored in real time by the pressure sensor, and the pressure rise curve is observed to determine whether the pressure rise is stable and whether there is any abnormal fluctuation. When the explosion-proof disk 503 on the lithium battery top cover 5 explodes, the test equipment 1 will automatically record the peak value of the explosion pressure at this time, and this data is the actual explosion pressure value of the explosion-proof disk 503.

[0022] Embodiment 2: In the above embodiment, the explosion-proof plate 503 on the lithium battery top cover 5 is subjected to an explosion test when the lithium battery top cover 5 is in a stationary state. However, in actual use, when the internal pressure of the battery increases sharply, the battery shell may be deformed. If the pressure increase process is very intense, a large amount of gas is generated inside the battery, and the shell expands rapidly under the pressure. This process may be accompanied by vibration. In addition, in extreme cases, if the explosion-proof plate 503 on the battery top cover begins to work and the gas ejects rapidly, the reaction force may also cause the battery to vibrate. Therefore, it is difficult to simulate and test the explosion of the explosion-proof plate 503 on the lithium battery top cover 5 in different states under real conditions. In order to solve the above problems, Figure 3-Figure 6 As shown, side plates 409 are fixedly installed on both sides of the sealing cover 406, and a control panel 412 is fixedly installed on one end of the side plate 409, and the control panel 412 has a first slideway 413 opened vertically. At the same time, a hinge seat 424 is fixedly installed on the workbench 102, and a control rod 425 is hinged on the hinge seat 424. The control rod 425 has a control ball (not marked in the figure), and the control ball is in the first slideway 413 in the default state, and the control ball is made of elastic material; A second slideway 414 is connected to the first slideway 413, and the bottom of the second slideway 414 is lower than the bottom of the first slideway 413, so that after the control ball slides from the first slideway 413 into the second slideway 414, it cannot return from the second slideway 414 to the first slideway 413; A third slide 416 is connected to the second slide 414. The bottom of the third slide 416 is lower than the bottom of the second slide 414. A first step (not shown in the figure) is provided between the third slide 416 and the second slide 414. Therefore, after the control ball slides from the second slide 414 into the third slide 416, it cannot return from the third slide 416 to the second slide 414. A first vertex 415 is provided at the connection between the third slide 416 and the second slide 414. The first vertex 415 is located in the third slide 416. A fourth slide 418 is connected to the third slide 416. The bottom of the fourth slide 418 is lower than the bottom of the third slide 416. A second step (not shown) is provided between the fourth slide 418 and the third slide 416. Thus, after the control ball slides from the third slide 416 into the fourth slide 418, it cannot return from the fourth slide 418 to the third slide 416. like Figure 3-Figure 6 As shown, a protruding block 423 is movably penetrated on the control plate 412, and a second mounting plate 421 is fixedly mounted on a side of the control plate 412 away from the first slideway 413, and a second cylinder 422 is fixedly mounted on the second mounting plate 421, and the telescopic end of the second cylinder 422 is connected to the protruding block 423; Thus, when the telescopic end of the second cylinder 422 is extended to the limit position, the protruding block 423 and the third slideway 416 form a stationary point 417 for the control ball to stay, and when the telescopic end of the second cylinder 422 is reset, the protruding block 423 and the third slideway 416 form a sixth slideway (not shown in the figure) for the control ball to pass through. It should be noted that, in the initial state, the protruding block 423 and the third slideway 416 form a stationary point 417 for the control ball to stay; At the same time, two sets of bases 203 are fixedly installed on the workbench 102 and directly below the placement platform 201. The base 203 has a supporting step (not shown in the figure), which is suitable for supporting the placement platform 201 when the placement platform 201 is pressed downward by the first cylinder 302. A limiting rod 204 is fixedly installed on the base 203, and a through hole (not shown in the figure) matching the diameter of the limiting rod 204 is opened on the side plate 409; The limiting rod 204 is suitable for passing through the through hole, so that when the sealing cover 406 is squeezed by the first cylinder 302, it is suitable for sliding on the limiting rod 204 to linearly limit the moving direction of the sealing cover 406 and tightly press it on the placement platform 201; In summary: when testing, the telescopic end of the first cylinder 302 drives the pressure plate 303 to move downward, and the pressure plate 303 pushes the sealing cover 406 to move downward through the pressure rod 305. At this time, the sealing cover 406 simultaneously stretches the first spring 405 and compresses the spring damper 206, and when the telescopic end of the first cylinder 302 reaches the specified position, the sealing cover 406 is pressed on the placement platform 201, and the placement platform 201 is synchronously supported on the support step of the base 203; The control ball slides from the first slideway 413 to the second slideway 414, and when the telescopic end of the first cylinder 302 reaches the specified position, the control ball abuts against the first vertex 415, so that when the telescopic end of the first cylinder 302 pushes the sealing cover 406 to move down to the specified position, the sealing cover 406 is again moved upward by the spring damper 206 and the first spring 405, and the control ball moves from the first vertex 415 again and stays at the stop point 417; At this time, the sealing cover 406 is pressed on the placement platform 201, and then the booster pump 407 is started to slowly fill the sealed space where the lithium battery top cover 5 is installed with gas. During the inflation process, the pressure value in the sealed space is monitored in real time by the pressure sensor; Continue to refer Figure 3-Figure 6 A fifth slide 420 is connected to the fourth slide 418, the bottom height of the fifth slide 420 is lower than the bottom height of the fourth slide 418, and a third step (not shown in the figure) is provided between the fourth slide 418 and the fifth slide 420, so that after the control ball slides from the fourth slide 418 into the fifth slide 420, it cannot return from the fifth slide 420 to the fourth slide 418, and a second vertex 419 is provided at the connection between the fourth slide 418 and the fifth slide 420; It should be noted that when the protruding block 423 is adapted to be reset along with the telescopic end of the second cylinder 422, the sixth slideway formed by the protruding block 423 and the third slideway 416 is connected to the fifth slideway 420; At the same time, the fifth slide 420 is connected to the first slide 413, and a transition slope (not shown in the figure) is arranged at the connection between the fifth slide 420 and the first slide 413. The transition slope gradually increases along the position close to the first slide 413, and the highest position of the transition slope is higher than the position of the groove bottom of the first slide 413 and forms a fourth step. The fourth step is used to limit the initial movement of the control ball, so that the control ball can only move from the first slide 413 to the second slide 414 during the initial movement. A motor 410 is fixedly mounted on the side of the base 203, and a cam 411 is fixedly mounted on the output end of the motor 410. The cam 411 is adapted to rotate along with the output end of the motor 410 to vibrate the placement platform 201, so as to simulate an explosion test when the explosion-proof disk 503 on the lithium battery top cover 5 is in a vibrating state; It should be noted that a first switch (not shown in the figure) is provided in the first slideway 413, and the first switch is used to control the motor 410 to be turned off, and a second switch (not shown in the figure) is provided at the stationary point 417, and the second switch is used to control the motor 410 to be started; Therefore, when the explosion-proof disc 503 on the lithium battery top cover 5 is subjected to an explosion test in a static state, the pressure value in the sealed space is monitored in real time by the pressure sensor. When the explosion-proof disc 503 on the lithium battery top cover 5 explodes, the test device 1 automatically records the explosion pressure peak value at this time, and this data is the actual explosion pressure value of the explosion-proof disc 503. At the same time, the pressure sensor senses and transmits the signal to the control system 101, and the control system 101 controls the start of the second cylinder 422 to reset, and controls the first cylinder 302 to reset at the same time. At this time, the second cylinder 422 drives the protruding block 423 to gradually move away from the control board 412 and form a sixth channel. At this time, with the reset of the first cylinder 302, the control ball slides from the sixth slide into the fifth slide 420, and then returns from the fifth slide 420 to the first slide 413 to restore the initial state; When the explosion-proof disc 503 on the lithium battery top cover 5 has not exploded, the control ball is at the stop point 417 and the second switch is pressed to start the control motor 410 to drive the cam 411 to rotate. Since the sealing cover 406 is sealed by engaging with the card slot 202 at the bottom end, the lithium battery top cover 5 can still be sealed even if the sealing cover 406 moves up a certain distance, and the placement platform 201 is driven to vibrate through the cam 411. At this time, the booster pump 407 is started again to slowly fill the sealed space where the lithium battery top cover 5 is installed with gas, and at the same time, pay close attention to whether the explosion-proof disc 503 explodes when the lithium battery top cover 5 vibrates. During the inflation process, the pressure value in the sealed space is monitored in real time through the pressure sensor; Then start the first cylinder 302 to drive the sealing cover 406 to move downward, and the sealing cover 406 simultaneously drives the control plate 412 to move downward. At this time, the control ball slides from the retention point 417 into the fourth slide 418 and is reset along with the first cylinder 302. At the same time, the sealing cover 406 moves upward under the action of the first spring 405, and drives the control plate 412 to move upward synchronously. At this time, the control ball slides from the second vertex 419 into the fifth slide 420, and then slides from the fifth slide 420 into the first slide 413 to press the first switch, and turns off the motor 410 to restore the initial state. As the sealing cover 406 gradually moves away from the placement platform 201, the placement platform 201 is simultaneously reset by the action of the spring damper 206.

[0023] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power lithium battery top cover detection device, characterized in that: include: Workbench (102); A placement mechanism (2), the placement mechanism (2) being arranged at the upper end of the workbench (102), the placement mechanism (2) comprising a placement platform (201) for supporting the top cover of the lithium battery, and a plurality of groups of spring dampers (206) for supporting the placement platform (201); A sealing mechanism (4), the sealing mechanism (4) being mounted on the workbench (102), the sealing mechanism (4) comprising a sealing cover (406) for sealing the top cover of the lithium battery, a plurality of booster pumps (407) for inflating the sealed space formed by the sealing cover (406) and the placement platform (201), and a first spring (405) for supporting the sealing cover (406); A pressing mechanism (3), the pressing mechanism (3) being installed on the workbench (102), the pressing mechanism (3) comprising a first cylinder (302) for pressing the sealing cover (406); a side plate (409), the side plate (409) being mounted on a side of the sealing cover (406), a control panel (412) being mounted on one end of the side plate (409), the control panel (412) having a first vertically opened slideway (413), a second slideway (414) being connected to the first slideway (413), and a third slideway (416) being connected to the second slideway (414); An articulated seat (424), the articulated seat (424) being mounted on the workbench (102), a control rod (425) being articulated on the articulated seat (424), the control rod (425) having a control ball adapted to the slideway, the control ball being made of an elastic material; Wherein, a protruding block (423) is installed on the control panel (412), and the protruding block (423) and the third slideway (416) form a stationary point (417) for the control ball to stay, and the stationary point (417) is provided with a second switch; Two groups of bases (203) are installed on the workbench (102), a motor (410) is installed on the side of the base (203), and a cam (411) is installed on the output end of the motor (410).

2. A power lithium battery top cover detection device according to claim 1, characterized in that: The bottom position of the groove of the second slide (414) is lower than the bottom position of the groove of the first slide (413), the bottom position of the groove of the third slide (416) is lower than the bottom position of the groove of the second slide (414), there is a first step between the third slide (416) and the second slide (414), and a first vertex (415) is provided at the connection between the third slide (416) and the second slide (414), and the first vertex (415) is located in the third slide (416).

3. A power lithium battery top cover detection device according to claim 2, characterized in that: The third slideway (416) is connected to a fourth slideway (418), the bottom of the fourth slideway (418) is lower than the bottom of the third slideway (416), and a second step is provided between the fourth slideway (418) and the third slideway (416).

4. A power lithium battery top cover detection device according to claim 3, characterized in that: A second mounting plate (421) is mounted on a side of the control plate (412) away from the first slideway (413); a second cylinder (422) is mounted on the second mounting plate (421); a telescopic end of the second cylinder (422) is connected to the protruding block (423); and the protruding block (423) is adapted to form a sixth slideway for a control ball to pass through with the third slideway (416) when the telescopic end of the second cylinder (422) is reset.

5. A power lithium battery top cover detection device according to claim 4, characterized in that: One end of the spring damper (206) is fixedly connected to the workbench (102), the base (203) has a supporting step, a limiting rod (204) is installed on the base (203), and a through hole matching the diameter of the limiting rod (204) is opened on the side plate (409).

6. A power lithium battery top cover detection device according to claim 5, characterized in that: The fourth slide (418) is connected to a fifth slide (420), the bottom height of the fifth slide (420) is lower than the bottom height of the fourth slide (418), a third step is provided between the fourth slide (418) and the fifth slide (420), and a second vertex (419) is provided at the connection between the fourth slide (418) and the fifth slide (420).

7. A power lithium battery top cover detection device according to claim 6, characterized in that: The fifth slide (420) is connected to the first slide (413), and a transition slope is provided at the connection between the fifth slide (420) and the first slide (413). The transition slope gradually increases along the position close to the first slide (413), and the highest position of the transition slope is higher than the bottom position of the groove of the first slide (413) and forms a fourth step. The fourth step is used to limit the initial movement of the control ball.

8. A power lithium battery top cover detection device according to claim 7, characterized in that: A first switch is arranged in the first slideway (413), and the first switch controls the motor (410) to be turned off, while the second switch controls the motor (410) to be turned on.

9. A power lithium battery top cover detection device according to claim 8, characterized in that: The sealing mechanism (4) comprises a fixed seat (401) mounted on the workbench (102), a mounting back plate (402) being mounted on the fixed seat (401), two sets of slide rails (403) being mounted on a side of the mounting back plate (402) close to the placement platform (201), sliders (404) being slidably mounted on the slide rails (403), a sliding frame (426) being connected between the two sets of sliders (404), a slot (202) being provided on the placement platform (201) and being adapted to the bottom of the sealing cover (406), a hose (408) being threadedly connected to the booster pump (407), the hose (408) being suitable for being connected to an external air supply device, a pressure sensor being mounted in the inner cavity of the sealing cover (406), and the pressure sensor being electrically connected to the control system (101).

10. A power lithium battery top cover detection device according to claim 9, characterized in that: The pressing mechanism (3) comprises a support seat (301) mounted on the workbench (102); a pressing plate (303) is mounted on the telescopic end of the first cylinder (302); and a pressing rod (305) is mounted on one end of the pressing plate (303).

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