An automatic detection device for lithium battery airtightness

Abstract

The application belongs to the technical field of lithium battery detection, and particularly relates to a lithium battery air tightness automatic detection device, which comprises a base, the top end of the base is rotationally connected with a rotating table, the top end of the rotating table is provided with a lifting plate, one side of the top end of the lifting plate is installed with an air pump, the two sides of the base are respectively provided with a feeding conveying device and a discharging conveying device, the top end of the feeding conveying device and the discharging conveying device are rotationally connected with a plurality of transmission rollers, the transmission rollers are externally sleeved with a conveying belt, and the conveying belt is externally fixed with a plurality of conveying shells at equal intervals; the rotating table, the feeding conveying device and the discharging conveying device are driven through the linkage of the gear disc and the transmission gear, and are matched with a double pushing plate synchronous feeding and discharging structure, so that the integrated synchronous driving of the equipment, the synchronous feeding and discharging, the uninterrupted operation of the conveying and detection processes and the waiting for the equipment shutdown are realized, and the overall operation efficiency of the lithium battery air tightness detection is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery testing technology, specifically an automatic testing device for the airtightness of lithium batteries. Background Technology

[0002] Lithium-ion batteries are core components of new energy vehicles, energy storage systems, and various consumer electronics products. Their sealing performance directly affects product safety and lifespan. Currently, the industry has developed various technical solutions for testing the airtightness of lithium-ion batteries, mainly including pressure decay methods, differential pressure methods, and helium mass spectrometry. Among these, pressure decay methods and differential pressure methods are the most widely used in large-scale automated production lines due to their high detection efficiency and controllable cost. Helium mass spectrometry, with its extremely high detection sensitivity, is mostly used for precision testing in high-end products or during the R&D stage. All these detection methods are based on the physical principles of gas pressure changes or tracing gas leaks, using sensors to capture minute signal changes to determine the battery's sealing status.

[0003] The conventional process of existing airtightness testing devices is as follows: First, the lithium battery to be tested is transferred to the testing station via a conveyor mechanism. A cylinder or motor drives the sealing fixture to close, creating a sealed space between the battery and the external environment. Then, dry air or nitrogen at a set pressure is introduced into the battery or testing chamber. After inflation, the gas source valve is closed, and the system enters a pressure holding phase, typically set to 5 to 20 seconds. During the pressure holding period, a high-precision pressure sensor collects pressure data in real time. After the testing cycle ends, the system compares the measured pressure drop with a preset threshold. If the pressure drop exceeds the threshold, the product is deemed leaking and rejected by the sorting mechanism. Some high-end devices introduce temperature compensation algorithms to correct for the influence of environmental temperature drift, or use differential pressure sensors to compare with a standard reference chamber for further improvement in testing accuracy.

[0004] Existing airtightness testing devices mostly adopt single-station or multi-station testing structures. During the testing process, a pressure holding time needs to be reserved. During this period, the conveying device must be stopped and wait, which makes continuous production impossible. When using multi-station testing, regardless of whether all stations are loaded with lithium batteries to be tested, the entire testing cycle must be completed in a fixed time. Idle stations result in a waste of effective testing time, leading to low overall testing efficiency.

[0005] Therefore, the present invention provides an automatic detection device for the airtightness of lithium batteries. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: An automatic lithium battery airtightness detection device of this invention includes a base, a rotating platform rotatably connected to the top of the base, a lifting plate disposed at the top of the rotating platform, an air pump installed on one side of the top of the lifting plate, an output end of the air pump connected to a solenoid valve via a pipe, an input end of the air pump connected to an external nitrogen supply device, an output end of the solenoid valve connected to a pressure gauge via a pipe, an output end of the pressure gauge connected to a tee via a pipe, a connecting joint connected to the tee via a pipe, and a second support frame fixed to one side of the base. The second support frame is equipped with a pushing component at its top, a limiting shell is provided below the lifting plate, and a pressing component is provided above the lifting plate for connecting the connector to the lithium battery injection hole. The base is equipped with a feeding conveyor and a discharging conveyor on its two sides respectively. Multiple transmission rollers are rotatably connected to the top of both the feeding and discharging conveyors. A conveyor belt is sleeved on the outside of the transmission rollers, and multiple conveying shells are fixed at equal intervals on the outside of the conveyor belt. A drive motor is installed inside the feeding conveyor, and the end of the drive motor is connected to one of the transmission rollers through a belt and a pulley.

[0008] Preferably, the pressing assembly includes an arc-shaped frame fixed to one side of the second support frame, a first support frame fixed to the top of the limiting shell, a guide rod passing through the top of the first support frame, a spring sleeved on the outside of the guide rod, the top of the spring being fixedly connected to the guide rod, the bottom of the spring being fixedly connected to the first support frame, and the bottom of the guide rod being fixedly connected to the lifting plate.

[0009] Preferably, the arc-shaped frame has a second inclined surface at both ends, and an arc-shaped block is fixed at one end of the lifting plate, with both sides of the arc-shaped block able to fit tightly against the second inclined surface.

[0010] Preferably, an insert plate is fixed to the end of the lifting plate away from the arc block, and a first inclined surface is provided below the side of the insert plate near the lifting plate.

[0011] Preferably, a connecting plate is fixed to the bottom end of the lifting plate, and two rotating plates are rotatably connected to the bottom end of the connecting plate. Both sides of the rotating plates are rotatably connected to a connector. The bottom end of the connector has a conical surface and a rubber ring is fixed to the bottom end of the connector.

[0012] Preferably, sliding holes are provided on both sides of the rotating plate, and the rotating shaft of the connector is slidably connected inside the sliding holes.

[0013] Preferably, an arc-shaped spring is provided inside the sliding hole on the side near the end of the rotating plate, and the rotating shaft of the connector is in close contact with the surface of the arc-shaped spring.

[0014] Preferably, the bottom end of the limiting shell is provided with a material discharge hole, the interior of the rotating table is provided with a connecting hole and a storage box, the interior of the material discharge hole is rotatably connected to a movable base plate, the top of the rotating table is equipped with an electric telescopic rod, the output shaft end of the electric telescopic rod is rotatably connected to a connecting arm, and the other end of the connecting arm is fixedly connected to the rotating shaft of the movable base plate.

[0015] Preferably, the pushing assembly includes a cylinder mounted on the top of the second support frame, a pusher fixed to the end of the output shaft of the cylinder, and two pushing plates fixed to the bottom of the pusher, the two pushing plates being respectively arranged at the feed position and the discharge position above the rotating table.

[0016] Preferably, the feeding and unloading conveying devices have a transmission gear fixed at one end of the transmission roller near the rotating table, and a gear plate is fixed at the bottom of the rotating table, with the bottom of the gear plate meshing with two transmission gears.

[0017] The beneficial effects of this invention are as follows: 1. The automatic lithium battery airtightness testing device of the present invention uses a rotating table, a feeding conveyor, and a discharging conveyor to be driven by a gear plate and a transmission gear, and is equipped with a double pusher plate synchronous feeding and discharging structure to realize integrated synchronous drive of the equipment, synchronous completion of feeding and discharging, uninterrupted operation of the conveying and testing processes, no need for equipment to stop and wait, and greatly improves the overall operation efficiency of lithium battery airtightness testing.

[0018] 2. The automatic lithium battery airtightness testing device of the present invention, by setting up a double-connector with a sliding rotating shaft, an arc-shaped spring and a conical surface and rubber ring sealing structure, can adaptively adapt to the different orientations of the liquid injection hole of the lithium battery facing inward and outward, automatically match and seal, effectively solve the problem of docking failure caused by the placement of lithium battery, and ensure the sealing performance and testing accuracy of airtightness testing. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the feeding and conveying device in this invention; Figure 3 This is a schematic diagram of the rotating platform structure in this invention; Figure 4 This is a schematic diagram of the arc-shaped frame structure in this invention; Figure 5 This is a schematic diagram of the limiting shell structure in this invention; Figure 6 This is a schematic diagram of the insert structure in this invention; Figure 7 This is a schematic diagram of the butt joint structure in this invention; Figure 8 This is a schematic diagram of the movable base plate structure in this invention.

[0021] In the diagram: 1. Base; 11. Rotating table; 111. Limiting shell; 112. Movable base plate; 1121. Connecting arm; 1122. Electric telescopic rod; 113. First support frame; 114. Spring; 115. Guide rod; 116. Lifting plate; 117. Insert plate; 118. First inclined plane; 119. Arc block; 12. Feeding and conveying device; 121. Drive motor; 122. Transmission roller; 123. Conveyor belt; 124. Conveyor shell; 1 25. Transmission gear; 13. Material feeding conveyor; 14. Second support frame; 141. Cylinder; 142. Push frame; 143. Push plate; 144. Arc frame; 145. Second inclined plane; 15. Air pump; 151. Solenoid valve; 152. Barometer; 153. T-joint; 154. Connecting plate; 155. Rotating plate; 1551. Sliding hole; 1552. Arc-shaped spring; 156. Connecting joint; 1561. Conical surface; 1562. Rubber ring. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 7As shown in the embodiment of the present invention, an automatic lithium battery airtightness testing device includes a base 1, a rotating platform 11 rotatably connected to the top of the base 1, a lifting plate 116 disposed at the top of the rotating platform 11, an air pump 15 mounted on one side of the top of the lifting plate 116, an output end of the air pump 15 connected to a solenoid valve 151 via a pipe, an input end of the air pump 15 connected to an external nitrogen supply device, an output end of the solenoid valve 151 connected to a pressure gauge 152 via a pipe, an output end of the pressure gauge 152 connected to a tee 153 via a pipe, a connector 156 connected to the tee 153 via a pipe, a second support frame 14 fixed to one side of the base 1, and a pushing assembly disposed at the top of the second support frame 14. A limiting shell 111 is provided below the lifting plate 116. The limiting shell 111 is fixedly connected to the rotating table 11. A pressing component is provided above the lifting plate 116 for connecting the connector 156 to the lithium battery injection hole. A feeding conveyor 12 and a discharging conveyor 13 are respectively provided on both sides of the base 1. Multiple transmission rollers 122 are rotatably connected to the top of the feeding conveyor 12 and the discharging conveyor 13. A conveyor belt 123 is sleeved on the outside of the transmission rollers 122. Multiple conveyor shells 124 are fixed at equal intervals on the outside of the conveyor belt 123. A drive motor 121 is installed inside the feeding conveyor 12. The end of the drive motor 121 is connected to one of the transmission rollers 122 through a belt and a pulley.

[0024] In the lithium battery production process, to ensure the stable use of lithium batteries, it is necessary to test the airtightness of the lithium battery casing. This requires an airtightness testing device. During the testing process, the feeding device loads the lithium battery to be tested into the conveyor shell 124 on the top side of the feeding conveyor 12, away from the base 1. At this point, the lithium battery has not been injected with electrolyte. After loading, the drive motor 121 is started, driving the transmission roller 122 to rotate. The transmission roller 122 drives the conveyor belt 123 to roll, and the conveyor belt 123 moves the conveyor shell 124 forward one station. Then, the drive motor 121 stops running. At this point, the conveyor shell 124 containing the lithium battery can move forward one station, allowing the conveyor shell 124 of the next station to move to the position of the feeding device. The unloading equipment continues to load lithium batteries to the next station. After unloading, the drive motor 121 starts, driving the conveyor shell 124 to move forward one station. This process continues, causing the conveyor belt 123 to drive multiple conveyor shells 124 to transport lithium batteries. When the conveyor shell 124 transports the lithium battery to the middle position of the base 1, the pushing component pushes the lithium battery out of the current position conveyor shell 124 and pushes it into the limiting shell 111. During this process, the conveyor belt 123 pauses rotation. After the lithium battery enters the limiting shell 111, the pushing component automatically resets. Then, the drive motor 121 drives the transmission roller 122 to rotate, causing the conveyor belt 123 to drive the conveyor shell 124 forward one station, allowing the next... The conveyor housing 124 at each workstation moves the lithium battery to the feeding position. Simultaneously, the rotating table 11 rotates the limiting housing 111 one workstation above the base 1, moving the limiting housing 111 (without a lithium battery) to the feeding position. This feeding process is repeated until the lithium battery with the limiting housing 111 is inserted and rotated. At this point, the pressing assembly presses down on the connector 156 to connect to the lithium battery's injection port. During this process, the air pump 15 is activated to draw nitrogen from an external air supply device. The solenoid valve 151 opens, and the air pump 15 delivers nitrogen through pipes via the solenoid valve 151, pressure gauge 152, and three-way valve 153 to the connector 156. The connector 156 then fills the lithium battery with nitrogen through the injection port. The pressure gauge 152 monitors the current pressure in real time. Air pressure monitoring: When the air pressure reaches the test value, the solenoid valve 151 disconnects the channel and stops the air pump 15. At this time, the internal pressure of the lithium battery is maintained for 5-15 seconds, and the current pressure is recorded in real time by the barometer 152 to collect the pressure difference. The pressure difference is used to determine whether the airtightness of the lithium battery is qualified. When the tested limiting shell 111 rotates to the position of the unloading conveyor 13, the pushing component pushes in a new lithium battery and simultaneously pushes the tested lithium battery into the conveyor shell 124 at the top of the unloading conveyor 13. The conveyor shell 124 at the top of the unloading conveyor 13 also moves forward one station as the rotating table 11 rotates. In this way, the internal of the lithium battery can be continuously tested, and the test is completed during the conveying process.This eliminates the need to stop the loading and unloading conveyors 12 and 13 while waiting for the test to complete, thus increasing testing efficiency.

[0025] like Figures 1 to 5 As shown, the pressing assembly includes an arc-shaped frame 144 fixed to one side of the second support frame 14, a first support frame 113 fixed to the top of the limiting shell 111, a guide rod 115 passing through the top of the first support frame 113, a spring 114 sleeved on the outside of the guide rod 115, the top of the spring 114 fixedly connected to the guide rod 115, the bottom of the spring 114 fixedly connected to the first support frame 113, and the bottom of the guide rod 115 fixedly connected to the lifting plate 116.

[0026] During the rotation of the rotating table 11 and the limiting shell 111, the first support frame 113 drives the lifting plate 116 to rotate with the limiting shell 111. During this process, the lifting plate 116 is guided and pressed down by the arc frame 144, causing the lifting plate 116 to drive the guide rod 115 to extend downwards, and the spring 114 is squeezed. At this time, the connector 156 can be squeezed to connect with the liquid injection hole of the lithium battery. When the limiting shell 111 rotates to leave the lower part of the arc frame 144, the elastic force of the spring 114 pushes the guide rod 115 to drive the lifting plate 116 to rise, thereby separating the connector 156 from the lithium battery, which facilitates the subsequent pushing of the lithium battery from the inside of the limiting shell 111 into the conveying shell 124 of the feeding conveying device 13.

[0027] like Figures 1 to 6 As shown, the arc frame 144 has a second inclined surface 145 at both ends, and an arc block 119 is fixed at one end of the lifting plate 116. The two sides of the arc block 119 can be closely attached to the second inclined surface 145.

[0028] When the lifting plate 116 needs to pass the bottom of the arc frame 144, the arc block 119 slides on the surface of the second inclined plane 145. The second inclined plane 145 guides the arc block 119 to move the lifting plate 116 downward as a whole, which makes it easier for the lifting plate 116 to move downward as a whole.

[0029] like Figures 1 to 6 As shown, a plate 117 is fixed to one end of the lifting plate 116 away from the arc block 119, and a first inclined surface 118 is provided on the lower side of the plate 117 near the lifting plate 116.

[0030] During the rotation of the rotating platform 11, the lithium battery inside the limiting shell 111 may slide outward due to centrifugal force generated by the rotation. Therefore, when the lifting plate 116 is pushed downward, it drives the insertion plate 117 to move downward. The lithium battery is pulled into the limiting shell 111 by the surface of the first inclined surface 118, and the insertion plate 117 further limits the lithium battery to ensure the stability of the lithium battery position during the test. At the same time, the fixed position can ensure that the connector 156 can be stably aligned with the liquid injection hole of the lithium battery.

[0031] like Figures 1 to 7 As shown, a connecting plate 154 is fixed to the bottom end of the lifting plate 116. Two rotating plates 155 are rotatably connected to the bottom end of the connecting plate 154. Both sides of the rotating plates 155 are rotatably connected to a connector 156. A conical surface 1561 is provided at the bottom end of the connector 156. A rubber ring 1562 is fixed at the bottom end of the connector 156.

[0032] During the process of installing the lithium battery into the limiting shell 111, because the liquid injection hole of the lithium battery may not be in the center, the liquid injection hole of the lithium battery inside the limiting shell 111 may face inward or outward. Therefore, two connectors 156 are set, and the two connectors 156 correspond to the liquid injection hole positions facing inward or outward respectively. When the lifting plate 116 drives the connecting plate 154 to press down, the connecting plate 154 drives the rotating plate 155 to press down the two connectors 156. At this time, the connector 156 without a liquid injection hole will be limited by the top of the lithium battery, making it a fulcrum. The connector 156 on the other side is guided by the conical surface 1561, and its bottom will be inserted into the liquid injection hole. At the same time, because the bottom of the connector 156 is flat, when the connector 156 is pushed and pressed, the bottom end of the connector 156 will be blocked. The rubber ring 1562 has elasticity and can better seal the bottom of the connector 156, so that only one connector 156 can output gas, realizing automatic selection of the corresponding connector 156 to connect to the liquid injection hole.

[0033] like Figures 1 to 7 As shown, sliding holes 1551 are provided on both sides of the rotating plate 155, and the rotating shaft of the connector 156 is slidably connected inside the sliding holes 1551.

[0034] During the process of the connecting plate 154 pressing down on the rotating plate 155, the rotating plate 155 will tilt because one side of the connector 156 is blocked by the lithium battery casing as a fulcrum, and the other side is inserted into the injection hole. At this time, the axis of the rotating plate 155 changes from a straight line to an oblique line, which shortens the distance between the two ends of the rotating plate 155. Since the position of the injection hole is fixed, the connector 156 cannot be aligned with the injection hole. To solve this problem, the rotating shaft of the connector 156 is slidably connected to the sliding hole 1551. The sliding space of the sliding hole 1551 automatically makes up for the shortened length of the two ends of the rotating plate 155 due to rotation, thereby solving the problem that the bottom end of the connector 156 cannot be aligned with the injection hole.

[0035] like Figures 1 to 7 As shown, an arc-shaped spring piece 1552 is provided inside the sliding hole 1551 on one side near the end of the rotating plate 155, and the rotating shaft of the connector 156 is in close contact with the surface of the arc-shaped spring piece 1552.

[0036] When the shaft of the connector 156 slides inside the sliding hole 1551, it applies pressure to the arc-shaped spring 1552, causing it to deform. At the same time, the elastic force of the arc-shaped spring 1552 applies pressure in the opposite direction, thereby supporting the shaft of the connector 156. When the connecting plate 154 pulls the rotating plate 155 up, causing the connector 156 to separate from the injection hole and the lithium battery surface, the elastic force of the arc-shaped spring 1552 will push the shaft of the connector 156 to automatically reset, thus facilitating subsequent use.

[0037] like Figures 1 to 8 As shown, the bottom end of the limiting shell 111 is provided with a material dropping hole, and the interior of the rotating table 11 is provided with a connecting hole and a storage box. The interior of the material dropping hole is rotatably connected to a movable base plate 112. An electric telescopic rod 1122 is installed at the top of the rotating table 11. The output shaft end of the electric telescopic rod 1122 is rotatably connected to a connecting arm 1121. The other end of the connecting arm 1121 is fixedly connected to the rotating shaft of the movable base plate 112.

[0038] During the testing process, some lithium batteries will fail the airtightness test. At this time, the electric telescopic rod 1122 is activated to push the connecting arm 1121 to rotate. The connecting arm 1121 drives the movable base plate 112 to rotate downward. At this time, the bottom of the lithium battery loses support, causing the lithium battery inside the limiting shell 111 to slide into the storage box inside the rotating table 11. The staff can then remove the unqualified lithium batteries in a unified manner, which is more efficient in the testing process.

[0039] like Figures 1 to 3 As shown, the feeding assembly includes a cylinder 141 mounted on the top of the second support frame 14. A pusher 142 is fixed to the end of the output shaft of the cylinder 141. Two pusher plates 143 are fixed to the bottom of the pusher 142. The two pusher plates 143 are respectively set on the feed position and the discharge position above the rotating table 11.

[0040] During the feeding and discharging process, the start cylinder 141 pulls the pusher 142, which drives the two pusher plates 143 to move simultaneously. The pusher plate 143 at the feeding position can push the lithium battery inside the conveying shell 124 above the feeding conveyor 12 into the limiting shell 111. The pusher plate 143 at the discharging position can push the lithium battery inside the limiting shell 111 into the conveying shell 124 above the discharging conveyor 13, thereby realizing the discharging while feeding.

[0041] like Figures 1 to 2 As shown, the feeding conveyor 12 and the unloading conveyor 13 have a transmission gear 125 fixed at one end of the transmission roller 122 near the rotating table 11, and a gear plate is fixed at the bottom of the rotating table 11. The bottom of the gear plate of the rotating table 11 is meshed with the two transmission gears 125.

[0042] During use, the drive motor 121 drives one of the transmission rollers 122 of the feeding conveyor 12 to rotate. The transmission roller 122 drives the transmission roller 122 near the rotating table 11 to rotate via the conveyor belt 123. This causes the transmission roller 122 to drive the transmission gear 125 to rotate. The transmission gear 125 drives the rotating table 11 to rotate via the gear plate, and also drives the transmission gear 125 of the unloading conveyor 13 to rotate via the gear plate. This allows the rotating table 11, the feeding conveyor 12, and the unloading conveyor 13 to be driven simultaneously, improving the efficiency of the inspection.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery airtightness automatic detection device, characterized in that: The device includes a base, a rotating platform rotatably connected to the top of the base, a lifting plate at the top of the rotating platform, an air pump mounted on one side of the top of the lifting plate, an output of the air pump connected to a solenoid valve via a pipe, an input of the air pump connected to an external nitrogen supply device, an output of the solenoid valve connected to a barometer via a pipe, an output of the barometer connected to a tee via a pipe, a connector connected to the tee via a pipe, a second support frame fixed to one side of the base, a pushing assembly at the top of the second support frame, a limit shell below the lifting plate, and a pressing assembly above the lifting plate for aligning the connector with the lithium battery injection hole. A feeding conveyor and a discharging conveyor are respectively located on both sides of the base. Multiple drive rollers are rotatably connected to the top of both the feeding and discharging conveyors. A conveyor belt is fitted around the outside of each drive roller, and multiple conveyor shells are fixed at equal intervals around the outside of the conveyor belt. A drive motor is installed inside the feeding conveyor, and the end of the drive motor is connected to one of the drive rollers via a belt and pulley.

2. The automatic lithium battery airtightness detection device according to claim 1, characterized in that: The pressing assembly includes an arc-shaped frame fixed to one side of the second support frame. A first support frame is fixed to the top of the limiting shell. A guide rod passes through the top of the first support frame. A spring is sleeved on the outside of the guide rod. The top of the spring is fixedly connected to the guide rod. The bottom of the spring is fixedly connected to the first support frame. The bottom of the guide rod is fixedly connected to the lifting plate.

3. The automatic lithium battery airtightness detection device according to claim 2, characterized in that: The arc-shaped frame has a second inclined surface at both ends, and an arc-shaped block is fixed at one end of the lifting plate. The two sides of the arc-shaped block can be closely attached to the second inclined surface.

4. The automatic lithium battery airtightness detection device according to claim 3, characterized in that: A plug plate is fixed to the end of the lifting plate away from the arc block, and a first inclined surface is provided on the lower side of the plug plate near the lifting plate.

5. The automatic lithium battery airtightness detection device according to claim 4, characterized in that: The bottom end of the lifting plate is fixed with a connecting plate, and the bottom end of the connecting plate is rotatably connected to two rotating plates. Both sides of the rotating plates are rotatably connected to a connector. The bottom end of the connector has a conical surface and a rubber ring is fixed to the bottom end of the connector.

6. The automatic lithium battery airtightness detection device according to claim 5, characterized in that: The rotating plate has sliding holes on both sides, and the rotating shaft of the connector is slidably connected inside the sliding holes.

7. The automatic lithium battery airtightness detection device according to claim 6, characterized in that: An arc-shaped spring is provided inside the sliding hole on one side near the end of the rotating plate, and the rotating shaft of the connector is in close contact with the surface of the arc-shaped spring.

8. The automatic lithium battery airtightness detection device according to claim 1, characterized in that: The bottom of the limiting shell is provided with a material discharge hole, and the interior of the rotating table is provided with a connecting hole and a storage box. The interior of the material discharge hole is rotatably connected to a movable base plate. An electric telescopic rod is installed at the top of the rotating table. The output shaft end of the electric telescopic rod is rotatably connected to a connecting arm, and the other end of the connecting arm is fixedly connected to the rotating shaft of the movable base plate.

9. The automatic lithium battery airtightness detection device according to claim 1, characterized in that: The pushing assembly includes a cylinder mounted on the top of the second support frame. A pusher is fixed to the end of the output shaft of the cylinder. Two pushing plates are fixed to the bottom of the pusher. The two pushing plates are respectively set at the feed position and the discharge position above the rotating table.

10. The automatic lithium battery airtightness detection device according to claim 1, characterized in that: The upper feeding conveying device and the lower feeding conveying device are fixed with transmission gears at one end of the transmission roller of the rotating table, the bottom end of the rotating table is fixed with a gear plate, and the gear plate bottom of the rotating table is engaged and connected with the two transmission gears.

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