A high-precision stacked battery cell air pressure testing device and its testing system

Abstract

The present invention discloses a high-precision stacked battery cell air pressure testing device and its testing system, comprising a support seat, a battery cell and an air pressure testing device, wherein the air pressure testing device is connected to the interior of the battery cell by opening an explosion-proof valve of the battery cell, so as to facilitate testing the internal air pressure of the battery cell, a battery cell is placed on the top of the support seat, and lifting assemblies are provided on both sides of the battery cell, a sealing mechanism is provided on the inner side end of the lifting assembly, a fixing assembly is provided at the front and rear ends of the lifting assembly, and an air pressure testing device is provided above the sealing mechanism; the present invention relates to the field of battery cell testing devices. The high-precision stacked battery cell air pressure testing device and its testing system, through the provided sealing mechanism, make the battery cell air pressure test data more accurate, and do not need to perform additional pre-processing on the battery cell before testing, so the testing process can be completed more quickly, and the sealing mechanism can be used multiple times to reduce the cost of testing.

Description

Technical Field

[0001] The present invention relates to the field of battery cell testing devices, and in particular to a high-precision stacked battery cell air pressure testing device and a testing system thereof. Background Art

[0002] Lithium-ion batteries offer advantages such as high voltage, high specific energy, a high number of cycles, and long storage life. They are widely used not only in portable electronic devices but also in large and medium-sized electric devices such as electric vehicles, electric bicycles, and power tools. Consequently, requirements for the performance and safety of lithium-ion batteries are becoming increasingly stringent. High-precision stacked cells can generate gas inside the cell during cycling due to side reactions in the cell materials and decomposition of the electrolyte, leading to increased internal pressure. Excessive internal pressure can seriously impact safety.

[0003] Therefore, it is necessary to test the internal air pressure of abnormal battery cells before disassembling and analyzing them, so as to provide data for battery cell material selection and failure analysis. However, there is no device in the prior art that is convenient for testing the internal air pressure of battery cells. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a high-precision stacked battery cell air pressure testing device and its testing system, which solves the problem of existing battery cell air pressure testing devices that require testing the internal air pressure of abnormal batteries before disassembling and analyzing them, so as to provide data for battery cell material selection and failure analysis.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-precision stacked battery cell air pressure testing device, comprising a support seat, a battery cell and an air pressure testing device, the air pressure testing device being connected to the inside of the battery cell by opening the explosion-proof valve of the battery cell, so as to test the internal air pressure of the battery cell, a battery cell is placed on the top of the support seat, a lifting assembly is provided on both sides of the battery cell, a sealing mechanism is provided at the inner end of the lifting assembly, a fixing assembly is provided at the front and rear ends of the lifting assembly, and an air pressure testing device is provided above the sealing mechanism; the sealing mechanism comprises a positioning seat fixedly connected to the lifting assembly, the top of the positioning seat is fixedly connected to a sliding rod, and a limiting nut is provided on the top of the sliding rod, a pushing block is slidably connected to the sliding rod, and the bottom of the pushing block is fixedly connected to The locking plate is fixedly secured to the underside of the locking plate and secured to the underside of the locking plate, wherein the locking plate is secured to a camming member which is secured to a camming member on the underside of the locking plate.

[0006] Preferably, the lifting assembly includes positioning rods fixedly mounted at both ends of the top of the support seat, a servo motor is mounted on the top of the positioning rod, a screw rod is fixedly connected to the output end of the servo motor, and the bottom end of the screw rod passes through the positioning rod and is rotatably connected to the top of the support seat through a bearing, and the circumferential outer surface of the screw rod is threadedly connected to the moving rod.

[0007] Preferably, the inner end of the moving rod is fixedly connected to the outer end wall of the positioning seat, and the fixing assembly is arranged at the front and rear ends of the moving rod.

[0008] Preferably, the fixing assembly includes an L-shaped fixing rod fixedly connected to the front and rear end faces of the moving rod, a sliding groove is provided at the inner end of the L-shaped fixing rod, and a slider is slidably connected in the sliding groove, the bottom end of the slider is fixedly connected to a clamping plate, and the outer end face of the clamping plate is rotatably connected to a threaded rod through a bearing, and the other end of the threaded rod passes through the L-shaped fixing rod, extends to the outside and is fixedly connected to a rotating disk.

[0009] Preferably, a buffer pad is provided on the inner end surface of the clamping plate, and the inner end surface of the buffer pad contacts the outer wall of the battery cell.

[0010] Preferably, the air pressure testing device includes: a puncture pressure rod, which is arranged on the jack of the sealing gasket in the sealing mechanism and is used to puncture the explosion-proof valve of the battery cell, and the puncture pressure rod is a hollow structure, and the top of the puncture pressure rod is sealed and connected to an air pressure sensor, and the air pressure sensor is used to test the internal air pressure of the battery cell transmitted by the hollow structure of the puncture pressure rod. The air pressure testing device also includes a handle, which is arranged on the puncture pressure rod, and the handle facilitates the transmission of the puncture force to the puncture pressure rod so that the puncture pressure rod can easily puncture the explosion-proof valve of the battery cell.

[0011] The present invention also discloses a high-precision stacked battery cell air pressure testing system, which specifically includes the following steps:

[0012] S1: Place the battery cell on top of the support base, with the end with the explosion-proof valve facing upward. Turning on the servo motor can drive the screw to rotate, thereby driving the moving rod to move up and down, so that the internal air pressure of battery cells at different heights can be tested. At the same time, the lifting assembly can drive the sealing mechanism to be located directly above the battery cell. By rotating the rotating disk to drive the threaded rod to rotate, the threaded rod can drive one side of the clamping plate to move, so that the battery cell can be clamped and fixed, completing the clamping operation of battery cells of different thicknesses;

[0013] S2: Place the air pressure test device on top of the sealing mechanism and insert the bottom of the puncture pressure rod into the jack of the sealing gasket so that it can pierce the explosion-proof valve of the battery cell, thereby enabling the air pressure test;

[0014] S3: By pressing the air pressure testing device downward, the pushing block on the sliding rod can be driven to move downward, and the pushing block can drive the first connecting block, the sealing gasket, and the second connecting block to move downward. Since the sealing gasket has a certain elasticity, when subjected to pressure, the sealing gasket will undergo elastic deformation, and the upper and lower ends of the sealing gasket are respectively in close contact with the top cover surface of the battery cell and the puncture pressure rod and the explosion-proof valve under the sealing gasket is sealed, so that the sealing gasket can cooperate closely with the explosion-proof valve on the top cover surface of the battery cell to achieve a sealing function. At the same time, the second connecting block can drive the upper end sealing pressure block and the limit plate to move downward and compress the spring, thereby driving the limit plate and the sealing pressure block at the lower end of the spring to move downward. Since the sealing gasket has a certain elasticity, when subjected to pressure, the sealing gasket will undergo elastic deformation, thereby driving the sealing gasket to seal between the positioning seat and the sealing gasket.

[0015] Preferably, one end of the puncture pressure rod for puncturing the explosion-proof valve of the battery cell is provided with a sharp structure, and the puncture pressure rod is made of a metal material with relatively high rigidity.

[0016] Beneficial effects

[0017] The present invention provides a high-precision stacked battery cell pressure test device and its test system. Compared with the prior art, it has the following advantages:

[0018] (1) The high-precision stacked battery cell air pressure test device and its test system can drive the push block located on the slide rod to move downward by pressing the air pressure test device downward, and the push block can drive the first connecting block, the sealing gasket, and the second connecting block to move downward. Since the sealing gasket has a certain elasticity, when subjected to pressure, the sealing gasket will undergo elastic deformation, and the upper and lower ends of the sealing gasket are in close contact with the top cover surface of the battery cell and the puncture pressure rod respectively, so that the explosion-proof valve under the sealing gasket is sealed, so that the sealing gasket can closely cooperate with the explosion-proof valve on the top cover surface of the battery cell to achieve a sealing function. At the same time, the second connecting block can drive the upper end sealing pressure block and the limit plate to move downward and compress the elastic pressure plate. The spring drives the limit plate and the sealing pressure block at the lower end of the spring to move downward. Since the sealing gasket has a certain elasticity, the sealing gasket will undergo elastic deformation when subjected to pressure, thereby driving the sealing gasket to seal between the positioning seat and the sealing gasket. The provided sealing mechanism makes the data of the battery cell air pressure test more accurate, and there is no need to perform additional processing on the battery cell before testing. The test process can be completed faster and the sealing mechanism can be used multiple times to reduce the cost of testing. The existing battery cell air pressure testing device solves the problem that when in use, it is necessary to test the internal air pressure of the abnormal battery cell before disassembling and analyzing it, so as to provide data for battery cell material selection and failure analysis.

[0019] (2) The high-precision stacked battery cell air pressure testing device and its testing system can drive the screw to rotate by turning on the servo motor, thereby driving the moving rod to move up and down, and then can test the internal air pressure of battery cells at different heights. The inner end of the moving rod is fixedly connected to the outer end wall of the positioning seat, and the fixing components are arranged at the front and rear ends of the moving rod, which is convenient for testing the internal air pressure of battery cells at different heights.

[0020] (3) The high-precision stacked battery cell air pressure testing device and its testing system drive the threaded rod to rotate by rotating the rotating disk. The threaded rod can drive the clamping plate to move toward the surface of one side of the battery cell, thereby clamping and fixing the battery cell, making it easier to fix the position of the battery cell and complete the clamping operation of battery cells of different thicknesses, which is convenient for subsequent testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the external structure of the present invention;

[0022] Figure 2 It is a structural three-dimensional cross-sectional view of the sealing mechanism of the present invention;

[0023] Figure 3Schematic diagram of the structure of the sealing mechanism of the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 It is a structural schematic diagram of the fixing component in the present invention.

[0026] In the figure: 1. Support seat; 2. Battery cell; 4. Lifting assembly; 5. Sealing mechanism; 6. Fixing assembly; 7. Air pressure testing device; 401. Positioning rod; 402. Servo motor; 403. Screw rod; 404. Moving rod; 501. Positioning seat; 502. Sliding rod; 503. Pushing block; 504. First connecting block; 505. Sealing gasket; 506. Jack; 507. Connecting plate; 508. Sealing pressure block; 509. Limiting plate; 510. Spring; 511. Second connecting block; 512. Sealing gasket; 601. L-shaped fixing rod; 602. Sliding block; 603. Clamping plate; 604. Threaded rod; 605. Rotating disk; 701. Air pressure sensor; 702. Handle; 703. Puncture pressure rod. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-5The present invention provides a technical solution: a high-precision stacked battery cell air pressure testing device, comprising a support base 1, a battery cell 2 and an air pressure testing device 7. The air pressure testing device 7 is connected to the interior of the battery cell 2 by pushing open the explosion-proof valve of the battery cell 2, so as to facilitate testing the internal air pressure of the battery cell 2. The battery cell 2 is placed on the top of the support base 1, and a lifting assembly 4 is provided on both sides of the battery cell 2. A sealing mechanism 5 is provided at the inner end of the lifting assembly 4, and a fixing assembly 6 is provided at the front and rear ends of the lifting assembly 4. The air pressure testing device 7 is provided above the sealing mechanism 5, and the air pressure testing device 7 pushes open the explosion-proof valve on the top cover of the battery cell 2. , since the explosion-proof valve is weaker than other parts of the battery cell 2, the explosion-proof valve is provided with an explosion-proof hole communicating with the interior of the battery cell 2, which is easy to be opened and connected with the interior of the battery cell 2. Therefore, the explosion-proof valve is selected as the opening position of the air pressure test device 7, so that the interior of the battery cell 2 is connected with the air pressure test device 7, and the sealing mechanism 5 seals the air pressure test device 7 and the battery cell 2, so that the gas inside the battery cell 2 can enter the air pressure test device 7 and will not leak into the outside air, thereby avoiding the reduction of the air pressure inside the battery cell 2, and then the air pressure inside the battery cell 2 is measured by the air pressure test device 7;The sealing mechanism 5 includes a positioning seat 501 fixedly connected to the lifting assembly 4, the top of the positioning seat 501 is fixedly connected to the sliding rod 502, and the top of the sliding rod 502 is provided with a limiting nut, the sliding rod 502 is slidably connected to a pushing block 503, the bottom of the pushing block 503 is fixedly connected to the first connecting block 504, and the bottom of the first connecting block 504 is inserted into the top of the positioning seat 501, the top of the positioning seat 501 is provided with a groove for the first connecting block 504 to slide up and down, the inner side end of the pushing block 503 is provided with a sealing gasket 505, the sealing gasket 505, and the inside of the sealing gasket 505 is provided with a socket 506. The inner wall of the first connecting block 504 is fixedly connected with a connecting plate 507, and symmetrical grooves are provided at the upper and lower ends of the inner end surface of the connecting plate 507, and a limiting plate 509 is slidably connected in the groove. A groove is provided in the middle of the inner end surface of the connecting plate 507, and a spring 510 is provided in the groove, and the two ends of the spring 510 are respectively fixedly connected to the inner ends of the two groups of limiting plates 509, and the other ends of the two groups of limiting plates 509 are fixedly connected to a sealing pressure block 508. The top of the upper end sealing pressure block 508 is fixedly connected to the second connecting block 511, and the top of the second connecting block 511 is fixedly connected to the bottom of the pushing block 503, and the lower end The bottom of the sealing pressure block 508 is fixedly connected with a sealing gasket 512, and the sealing gasket 512 is slidably connected to the inner wall of the positioning seat 501. By pressing the air pressure test device 7 downward, the pushing block 503 can be driven to move downward on the slide rod 502, and the pushing block 503 can drive the first connecting block 504, the sealing gasket 505, and the second connecting block 511 to move downward. Since the sealing gasket 505 has a certain elasticity, when it is subjected to pressure, the sealing gasket 505 will undergo elastic deformation, and the upper and lower ends of the sealing gasket 505 are in close contact with the top cover surface of the battery cell 2 and the puncture pressure rod 703 respectively, so that the The explosion-proof valve below the sealing gasket 505 is sealed, allowing the sealing gasket 505 to closely cooperate with the explosion-proof valve on the top cover of the battery cell 2 to achieve a sealing function. At the same time, the second connecting block 511 can drive the upper sealing block 508 and the limit plate 509 to move downward and compress the spring 510, thereby driving the limit plate 509 and the sealing block 508 at the lower end of the spring 510 to move downward. Because the sealing gasket 512 has a certain degree of elasticity, when subjected to pressure, the sealing gasket 512 will elastically deform, thereby driving the sealing gasket 512 to seal between the positioning seat 501 and the sealing gasket 512.

[0029] In order to be able to test the internal air pressure of battery cells 2 at different heights, the lifting assembly 4 includes a positioning rod 401 fixedly mounted on both ends of the top of the support seat 1, and a servo motor 402 is installed on the top of the positioning rod 401. The servo motor 402 can rotate forward and reverse, and the servo motor 402 has a self-locking function. The output end of the servo motor 402 is fixedly connected to a screw rod 403, and the bottom end of the screw rod 403 passes through the positioning rod 401 and is rotatably connected to the top of the support seat 1 through a bearing. The circumferential outer surface of the screw rod 403 is threadedly connected to a moving rod 404, and one end of the moving rod 404 is slidably connected to the inner end of the positioning rod 401 through a slider. By turning on the servo motor 402, the screw rod 403 can be driven to rotate, thereby driving the moving rod 404 to rise and fall, and thus the internal air pressure of battery cells 2 at different heights can be tested. The inner end of the moving rod 404 is fixedly connected to the outer end wall of the positioning seat 501, and the fixing assembly 6 is arranged at the front and rear ends of the moving rod 404.

[0030] In order to fix the position of the battery cell 2 and facilitate air pressure testing, the fixing assembly 6 includes an L-shaped fixing rod 601 fixedly connected to the front and rear end faces of the moving rod 404, and a sliding groove is provided at the inner end of the L-shaped fixing rod 601, and a slider 602 is slidably connected in the sliding groove, and the bottom end of the slider 602 is fixedly connected to a clamping plate 603, and the outer end face of the clamping plate 603 is rotatably connected to a threaded rod 604 through a bearing, and the other end of the threaded rod 604 extends through the L-shaped fixing rod 601 to the outside and is fixedly connected to a rotating disk 605, and the threaded rod 604 is threadedly connected to the L-shaped fixing rod 601. By rotating the rotating disk 605, the threaded rod 604 is driven to rotate, and the threaded rod 604 can drive the clamping plate 603 to move toward the surface of one side of the battery cell 2, so that the battery cell 2 can be clamped and fixed, completing the clamping operation of battery cells 2 of different thicknesses, which is convenient for subsequent testing.

[0031] In order to prevent the battery cell 2 from being damaged by excessive clamping force, a buffer pad is provided on the inner end surface of the clamping plate 603 , and the inner end surface of the buffer pad contacts the outer wall of the battery cell 2 .

[0032] The air pressure test device 7 includes: a puncture pressure rod 703. The puncture pressure rod 703 should be as small as possible without affecting the air pressure sensor 701, so that the air pressure change value inside the battery cell 2 is smaller when the battery cell 2 is connected to the air pressure test device 7, so that the test value is more accurate. The puncture pressure rod 703 is set on the jack 506 of the sealing gasket 505 in the sealing mechanism 5, and is used to puncture the explosion-proof valve of the battery cell 2. The puncture pressure rod 703 is a hollow structure, and the top of the puncture pressure rod 703 is The air pressure sensor 701 is sealed and connected to the battery cell 2. The air pressure sensor 701 is used to test the internal air pressure of the battery cell 2 transmitted by the hollow structure of the puncture pressure rod 703. The air pressure testing device 7 also includes a handle 702. The handle 702 is set on the puncture pressure rod 703, and the handle 702 is used to transmit the puncture force to the puncture pressure rod 703 so that the puncture pressure rod 703 can easily pierce the explosion-proof valve of the battery cell 2. The bottom of the handle 702 is provided with a fixed block for pressing the push block 503.

[0033] In order to facilitate the puncture rod 703 to penetrate the interior of the battery cell 2, the puncture force is easily transmitted to the puncture rod 703 through the handle 702 so that the puncture rod 703 can easily pierce the explosion-proof valve of the battery cell 2. The handle 702 is welded to the puncture rod 703, and the puncture force required to pierce the explosion-proof valve can be easily applied to the puncture rod 703 through the handle 702. Furthermore, the handle 702 is a symmetrical structure about the puncture rod 703, so that when an external force acts on the handle 702, the puncture rod 703 can be given a force that is more parallel to the puncture rod 703 relative to the asymmetric handle 702, so that the force acting on the handle 702 can basically be used for the puncture rod 703 to pierce the explosion-proof valve, so that the force acting on the handle 702 will not cause the puncture rod 703 to deform, thereby facilitating the puncture rod 703 to penetrate the interior of the battery cell 2.

[0034] The present invention also discloses a high-precision stacked battery cell air pressure testing system, which specifically includes the following steps:

[0035] S1: Place the battery cell 2 on the top of the support base 1, with the end with the explosion-proof valve facing upward. By turning on the servo motor 402, the screw rod 403 can be driven to rotate, thereby driving the moving rod 404 to move up and down, and then the internal air pressure of the battery cells 2 at different heights can be tested. At the same time, the lifting assembly 4 can drive the sealing mechanism 5 to be located directly above the battery cell 2. By rotating the rotating disk 605 to drive the threaded rod 604 to rotate, the threaded rod 604 can drive the clamping plate 603 to move toward the surface of one side of the battery cell 2, so that the battery cell 2 can be clamped and fixed, completing the clamping operation of the battery cells 2 of different thicknesses;

[0036] S2: Place the air pressure test device 7 on top of the sealing mechanism 5 and insert the bottom of the puncture pressure rod 703 into the insertion hole 506 of the sealing gasket 505 so that it can pierce the explosion-proof valve of the battery cell 2, thereby enabling an air pressure test;

[0037] S3: By pressing the air pressure test device 7 downward, the push block 503 on the slide bar 502 can be driven to move downward, and the push block 503 can drive the first connecting block 504, the sealing gasket 505, and the second connecting block 511 to move downward. Since the sealing gasket 505 has a certain elasticity, when it is subjected to pressure, the sealing gasket 505 will undergo elastic deformation, and the upper and lower ends of the sealing gasket 505 are in close contact with the top cover surface of the battery cell 2 and the puncture pressure rod 703 respectively, so that the explosion-proof valve under the sealing gasket 505 is sealed, so that the sealing gasket 505 is sealed. The sealing gasket 505 can cooperate closely with the explosion-proof valve on the top cover surface of the battery cell 2 to achieve a sealing function. At the same time, the second connecting block 511 can drive the sealing pressure block 508 and the limit plate 509 at the upper end to move downward and compress the spring 510, thereby driving the limit plate 509 and the sealing pressure block 508 at the lower end of the spring 510 to move downward. Since the sealing gasket 512 has a certain elasticity, when subjected to pressure, the sealing gasket 512 will undergo elastic deformation, thereby driving the sealing gasket 512 to seal between the positioning seat 501 and the sealing gasket 512.

[0038] In order to make it easier for the puncture rod 703 to penetrate the interior of the battery cell 2 at the explosion-proof valve, a sharp structure is provided on one end of the puncture rod 703 for puncturing the explosion-proof valve of the battery cell 2, and the puncture rod 703 is made of a metal material with high rigidity.

[0039] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision stacked battery cell air pressure test device, comprising a support seat (1), a battery cell (2) and an air pressure test device (7), wherein the air pressure test device (7) is connected to the interior of the battery cell (2) by opening an explosion-proof valve of the battery cell (2) to facilitate testing the internal air pressure of the battery cell (2), and is characterized in that: A battery cell (2) is placed on the top of the support seat (1), lifting assemblies (4) are provided on both sides of the battery cell (2), a sealing mechanism (5) is provided at the inner end of the lifting assembly (4), a fixing assembly (6) is provided at the front and rear ends of the lifting assembly (4), and an air pressure testing device (7) is provided above the sealing mechanism (5); The sealing mechanism (5) includes a positioning seat (501) fixedly connected to the lifting assembly (4), the top of the positioning seat (501) is fixedly connected to a slide rod (502), and a limit nut is provided on the top of the slide rod (502), a push block (503) is slidably connected to the slide rod (502), the bottom of the push block (503) is fixedly connected to a first connecting block (504), and the bottom of the first connecting block (504) is inserted into the top of the positioning seat (501), the inner side end of the push block (503) is provided with a sealing gasket (505), the inside of the sealing gasket (505) is provided with a socket (506), the inner wall of the first connecting block (504) is fixedly connected to a connecting plate (507), and the inner end surface of the connecting plate (507) is fixedly connected to the inner side end surface of the connecting plate (507). Symmetrical grooves are provided at the upper and lower ends, and a limiting plate (509) is slidably connected in the groove. A groove is provided in the middle of the inner end surface of the connecting plate (507), and a spring (510) is provided in the groove. The two ends of the spring (510) are respectively fixedly connected to the inner ends of the two groups of limiting plates (509). The other ends of the two groups of limiting plates (509) are fixedly connected to a sealing pressure block (508). The top of the upper sealing pressure block (508) is fixedly connected to a second connecting block (511), and the top of the second connecting block (511) is fixedly connected to the bottom of the pushing block (503). The bottom of the lower sealing pressure block (508) is fixedly connected to a sealing gasket (512), and the sealing gasket (512) is slidably connected to the inner wall of the positioning seat (501). The air pressure testing device (7) is pressed, which drives the push block (503) to move downward, and the push block (503) drives the first connecting block (504), the sealing gasket (505), and the second connecting block (511) to move downward, and the second connecting block (511) drives the upper end sealing pressure block (508) and the limit plate (509) to move downward and compress the spring (510), thereby driving the limit plate (509) and the sealing pressure block (508) at the lower end of the spring (510) to move downward.

2. A high-precision stacked battery core air pressure testing device according to claim 1, characterized in that: The lifting assembly (4) includes positioning rods (401) fixedly mounted at both ends of the top of the support seat (1), a servo motor (402) being mounted on the top of the positioning rod (401), a screw rod (403) being fixedly connected to the output end of the servo motor (402), and a bottom end of the screw rod (403) passing through the positioning rod (401) and being rotatably connected to the top of the support seat (1) via a bearing, and a moving rod (404) being threadedly connected to the circumferential outer surface of the screw rod (403).

3. The high-precision stacked battery core air pressure testing device according to claim 2, characterized in that: The inner end of the moving rod (404) is fixedly connected to the outer end wall of the positioning seat (501), and the fixing assembly (6) is arranged at the front and rear ends of the moving rod (404).

4. The high-precision stacked battery cell air pressure testing device according to claim 3, characterized in that: The fixing assembly (6) comprises an L-shaped fixing rod (601) fixedly connected to the front and rear end surfaces of the moving rod (404); a sliding groove is provided at the inner end of the L-shaped fixing rod (601), and a slider (602) is slidably connected in the sliding groove; the bottom end of the slider (602) is fixedly connected to a clamping plate (603); the outer end surface of the clamping plate (603) is rotatably connected to a threaded rod (604) via a bearing; the other end of the threaded rod (604) passes through the L-shaped fixing rod (601) and extends to the outside and is fixedly connected to a rotating disk (605).

5. The high-precision stacked battery cell air pressure testing device according to claim 4, characterized in that: The inner end surface of the clamping plate (603) is provided with a buffer pad, and the inner end surface of the buffer pad contacts the outer wall of the battery core (2).

6. The high-precision stacked battery cell air pressure testing device according to claim 5, characterized in that: The air pressure testing device (7) comprises: a puncture pressure rod (703), the puncture pressure rod (703) being arranged on the jack (506) of the sealing gasket (505) in the sealing mechanism (5) and being used for puncturing the explosion-proof valve of the battery cell (2), and the puncture pressure rod (703) being a hollow structure, the top of the puncture pressure rod (703) being sealed and connected to an air pressure sensor (701), and the air pressure sensor (701) being used for testing the internal air pressure of the battery cell (2) transmitted from the hollow structure of the puncture pressure rod (703), and the air pressure testing device (7) further comprises a handle (702), the handle (702) being arranged on the puncture pressure rod (703), and the handle (702) being used to facilitate the transmission of the puncture force to the puncture pressure rod (703) so that the puncture pressure rod (703) can easily puncture the explosion-proof valve of the battery cell (2).

7. A high-precision stacked battery cell pressure testing system, based on the high-precision stacked battery cell pressure testing device according to claim 6, characterized in that: The test system includes the following steps: S1: The battery cell (2) is placed on the top of the support seat (1), with the end with the explosion-proof valve facing upwards. By turning on the servo motor (402), the screw rod (403) can be driven to rotate, thereby driving the moving rod (404) to move up and down, thereby testing the internal air pressure of the battery cells (2) at different heights. At the same time, the lifting component (4) can drive the sealing mechanism (5) located directly above the battery cell (2). By rotating the rotating disk (605), the threaded rod (604) is driven to rotate. The threaded rod (604) can drive the clamping plate (603) to move toward the surface of one side of the battery cell (2), thereby clamping and fixing the battery cell (2), completing the clamping operation of the battery cells (2) of different thicknesses; S2: placing the air pressure test device (7) on top of the sealing mechanism (5), inserting the bottom of the puncture pressure rod (703) into the socket (506) of the sealing gasket (505), so that it can pierce the explosion-proof valve of the battery cell (2), thereby enabling the air pressure test; S3: By pressing the air pressure test device (7) downward, the push block (503) located on the slide bar (502) can be driven to move downward, and the push block (503) can drive the first connection block (504), the sealing gasket (505), and the second connection block (511) to move downward. Since the sealing gasket (505) has a certain elasticity, when subjected to pressure, the sealing gasket (505) will undergo elastic deformation, and the upper and lower ends of the sealing gasket (505) are in close contact with the top cover surface of the battery cell (2) and the puncture pressure rod (703) respectively, so that the explosion-proof valve under the sealing gasket (505) is sealed, so that the sealing gasket (505) is sealed. The gasket (505) can closely cooperate with the explosion-proof valve on the top cover surface of the battery cell (2) to achieve a sealing function. At the same time, the second connecting block (511) can drive the sealing pressure block (508) and the limit plate (509) at the upper end to move downward and compress the spring (510), thereby driving the limit plate (509) and the sealing pressure block (508) at the lower end of the spring (510) to move downward. Since the sealing gasket (512) has a certain elasticity, when subjected to pressure, the sealing gasket (512) will undergo elastic deformation, thereby driving the sealing gasket (512) to seal between the positioning seat (501) and the sealing gasket (512).

8. The high-precision stacked battery cell air pressure testing system according to claim 7, characterized in that: One end of the puncture pressure rod (703) for puncturing the explosion-proof valve of the battery core (2) is provided with a sharp structure, and the puncture pressure rod (703) is made of a metal material with high rigidity.

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