Square battery case airtightness detection equipment and method

Abstract

The invention discloses a square battery case airtightness detection device and method.The square battery case airtightness detection device comprises a workbench, a detection table arranged on the workbench, an air inlet assembly and a longitudinal contraction mechanism, the detection table comprises a base, a synchronous moving mechanism and two sealing covers, the base is located above the workbench, and the synchronous moving mechanism is located above the workbench; the base and the two sealing covers are all made of glass materials, a battery shell is suitable for being placed in the base, and the synchronous moving mechanism is connected with the two sealing covers and the base so as to be suitable for driving the two sealing covers to move oppositely to be in butt joint and wrap the battery shell; a cavity is formed among the battery shell, the sealing covers and the base, a square air inlet cavity is formed after the two sealing covers are in butt joint, the square air inlet cavity is communicated with an opening of the battery shell, steam is introduced into the battery shell after the battery shell is covered with a glass material, and the steam is sprayed on glass through an air leakage point to form a mist point so that accurate positioning can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to a square battery shell air tightness detection device and method. Background Art

[0002] At present, in the field of battery manufacturing, especially in the production process of square battery shells, airtightness testing is a key link to ensure product quality and safety. A battery shell with good airtightness can effectively prevent moisture, dust and other impurities from entering the battery, thereby avoiding battery short circuits, corrosion and other failures, and ensuring the stability and service life of the battery.

[0003] After searching, it was found that a Chinese patent with the announcement number CN220380692U disclosed a battery shell air tightness detection device. The patent adopts a detection box, a bottom plate, and a cover plate structure. The bottom plate can be raised and lowered and is provided with a positioning block to fix the battery shell. The cover plate seals the battery shell opening. The air tightness is detected by sinking the battery shell into the detection liquid to observe the bubbles. It has the advantages of simple structure, convenient operation, and convenient placement and removal of the battery shell. However, the patent still adopts the traditional water detection method. When the leak point exhausts air into the water to produce continuous bubbles, it is not easy to observe the specific leak position, and multiple leaks will cause dense bubbles and it is even more difficult to confirm. The water detection method does not have a good leak location function. At the same time, the steam detection method is more flexible. When an inert gas is added, chemical reactions with other components in the battery shell can be avoided. The visibility of the steam ejected from the leak point can also be further improved by adding fluorescent powder. At the same time, water detection will cause water to flow into the leak point of the battery shell. Compared with steam detection, the amount of condensed water caused by steam remaining in the battery shell is less, which is not easy to damage the components in the battery shell. In addition, steam detection can avoid the generation of condensed water by blowing dry gas after the detection is completed, and the detection is safer. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects existing in the prior art. After the battery shell is covered with glass material, steam is introduced into the battery shell, and the steam is then sprayed onto the glass through the leakage point to form fog points, thereby achieving accurate positioning.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a square battery shell airtightness detection device, comprising: Workbench; A test bench placed on the workbench, the test bench comprising a base, a synchronous moving mechanism and two sealing covers, the base being located above the workbench, the base and the two sealing covers being made of glass, the base being suitable for placing a battery shell, the synchronous moving mechanism being respectively connected to the two sealing covers and the base so as to drive the two sealing covers to move towards each other to dock and wrap the battery shell, a cavity being formed between the battery shell, the sealing cover and the base, an air intake square cavity being formed after the two sealing covers are docked, and the air intake square cavity is communicated with an opening of the battery shell; An air intake assembly, wherein a bracket is connected to the workbench, the air intake assembly comprises a steam generator, a cover plate, an air intake sleeve, and a lifting component connected to the bracket, the cover plate is provided with a first air intake port communicating with the air intake sleeve, the cover plate is connected to the air intake sleeve, the air intake sleeve is connected to the steam generator, the lifting component is connected to the air intake sleeve to drive the air intake sleeve to move longitudinally, the cover plate is suitable for being driven to move and cover the air intake square cavity, thereby passing steam into the battery shell; A longitudinal contraction mechanism is connected to the base and is located between the battery shell and the base.

[0006] Further, the synchronous movement mechanism includes a bidirectional screw and two transmission sleeves respectively connected to the sealing covers, the bidirectional screw is rotatably mounted on one side of the base, the two transmission sleeves are respectively mounted on two opposite threads of the bidirectional screw, the bidirectional screw is suitable for being moved to rotate, thereby driving the two sealing covers to move in opposite directions or towards each other along the axis of the bidirectional screw, and the lifting component is a cylinder; A sealing groove is provided on each of the two sealing covers, a second sealing gasket is provided at the bottom of the cover plate, and the second sealing gasket is adapted to be inserted into the sealing groove when being driven to move toward the sealing cover, and a first sealing gasket is provided in each of the two sealing grooves, and the first sealing gasket is adapted to follow the corresponding sealing cover to move toward the battery shell, and then be squeezed with the top of the battery shell to form a seal; The longitudinal contraction mechanism includes a longitudinal contact block and a first spring telescopic rod, one end of the first spring telescopic rod is connected to the base, and the longitudinal contact block is connected to the other end of the first spring telescopic rod. The longitudinal contact block is suitable for supporting the bottom of the battery shell, and a first air vent connected to the outside is opened in the longitudinal contact block.

[0007] Furthermore, the square battery shell airtightness detection equipment also includes a cleaning component, which includes an air blower and two first collecting plates. The two sealing covers are each provided with a second air inlet penetrating through the two sealing covers. The two first collecting plates correspond to the two sealing covers respectively. The first collecting plates are connected to the corresponding sealing covers. The first collecting plates are suitable for covering the second air inlet opened on the corresponding sealing covers. The two first collecting plates are both connected to the air blower through a hose. A water outlet trough is provided in the base, and the water outlet trough is communicated with the outside.

[0008] Furthermore, the square battery shell airtightness detection device also includes a matching component, the matching component includes a condenser, two partitions corresponding to the sealing cover, and two second collecting plates corresponding to the sealing cover, and the partition is made of glass; The two sealing covers are each provided with a third air inlet penetrating through the two sealing covers, the second collecting plate is connected to the corresponding sealing cover and covers the corresponding third air inlet, and the two second collecting plates are both connected to the condenser through a hose; The partition is arranged in the corresponding sealing cover, and the partition is suitable for dividing the cavity into a normal temperature cavity and a cold air cavity, the normal temperature cavity is communicated with the second air inlet, and the cold air cavity is communicated with the third air inlet. The sealing cover is provided with a side cold air channel on the inner wall within the range of the cold air cavity, and the side cold air channel is suitable for introducing the cold air in the cold air cavity into the remaining surfaces that are not in direct contact with the cold air cavity. The bottom of the partition is provided with an air vent that runs through the partition, and a bottom cold air channel is provided in the base. When the sealing cover is driven and contacts the base, the air vent is communicated with the bottom cold air channel, and the bottom cold air channel is suitable for introducing the cold air in the cold air cavity into the entire surface of the base, and the bottom cold air channel is not communicated with the water outlet trough.

[0009] Furthermore, two mounting plates are connected to the bottom of the base, and impellers are rotatably installed in the two mounting plates. The two impellers are located at the air outlet of the first air inlet, and the two impellers are arranged alternately. The two impellers are suitable for being driven by the steam discharged from the first air inlet to rotate in opposite directions.

[0010] Furthermore, the square battery case airtightness detection device also includes a recording component, which includes a first industrial camera, a second industrial camera, and a rotating mechanism connected to the second industrial camera; The rotating mechanism comprises a rotating motor, a driving gear and a driven gear, the rotating motor is mounted on the bracket, the driving gear and the driven gear are both rotatably mounted on the bracket, the driving gear is connected to the rotating motor, the driving gear is meshed with the driven gear, a camera adjustment frame is fixedly connected to the driven gear, and the second industrial camera is mounted on the camera adjustment frame; A protrusion is connected to the bottom of the base, and a support seat is connected to the bottom of the protrusion. There is a gap between the support seat and the base. The first industrial camera is installed on the support seat. The lens of the first industrial camera corresponds to the bottom surface of the base, thereby detecting the bottom sealing state of the battery shell.

[0011] Furthermore, an adjustment component is provided in the base, and the adjustment component includes a front-to-back adjustment mechanism and a left-to-right adjustment mechanism; The front-to-back adjustment mechanism includes a first movable block and a second movable block. The base is used to accommodate the inner cavity of the battery shell and includes four surfaces, namely a first side, a second side, a third side and a fourth side. The first movable block is arranged on the first side. A second spring telescopic rod is connected to the first movable block. The other end of the second spring telescopic rod is connected to a front contact block. The front contact block is suitable for contacting the battery shell. A second air vent communicating with the outside is provided in the front contact block. The second movable block is arranged on the second side, the first side and the second side are opposite to each other, a fourth spring telescopic rod is connected to the second movable block, the other end of the fourth spring telescopic rod is connected to a rear contact block, the rear contact block is suitable for contacting with the battery shell, and a third vent hole communicating with the outside is opened in the rear contact block; The left and right adjustment mechanism includes two fifth spring telescopic rods, which are respectively connected to the third side and the fourth side, and the third side and the fourth side are relatively positioned. The two fifth spring telescopic rods are respectively connected to side contact blocks, and the side contact blocks are suitable for contacting the battery shell.

[0012] Further, a linear motion mechanism is arranged in the workbench, and the linear motion mechanism comprises a driving motor, a threaded rod and a moving plate, the driving motor is mounted on the workbench, the threaded rod is rotatably mounted in the workbench, the moving plate is assembled on the threaded rod, the moving plate is connected to the support seat, and the driving motor is connected to the threaded rod to drive the moving plate to move along the axis direction of the threaded rod; A loading component is provided on one side of the workbench, and the loading component is located on the workbench in the direction of the same side as the first side, and the loading component includes a placement plate and a vertical plate, the placement plate is connected to the workbench, and the vertical plate is connected to the placement plate, a first channel is provided on the placement plate, and a second channel is provided on the vertical plate, the first channel is communicated with the second channel, and the first channel and the second channel are both suitable for providing space for the first movable block to pass through, a gear plate is fixedly connected to the bidirectional screw, and a loading rack is connected to the workbench, and when the detection platform is driven to move toward the loading component, the loading rack is meshed with the gear plate to drive the bidirectional screw to rotate; The first movable block is rotatably arranged relative to the first side, a loading inclined surface is arranged on the side of the first movable block close to the loading component, a fixing rod is connected between the third side and the fourth side, the first movable block is movably sleeved on the outside of the fixing rod, two first contraction springs are sleeved on the fixing rod, two ends of one of the first contraction springs are respectively connected to the first movable block and the third side, and two ends of the other first contraction spring are respectively connected to the first movable block and the fourth side, and a stopper is connected to the first side; A height limiting component is arranged on the workbench, and the height limiting component includes a height limiting frame and a height limiting block. The height limiting frame is connected to the workbench, and the height limiting block is connected to the height limiting frame. The height limiting block is located at the center of the height limiting frame, and guide inclined surfaces are arranged on both sides of the height limiting block. When the detection platform is driven by the linear moving mechanism to move toward the loading component, it first passes through the height limiting component, an upper inclined surface is arranged on the top of the side contact block, and a front inclined surface is arranged on the side of the side contact block close to the loading component.

[0013] Further, a blanking component is provided on the other side of the workbench, and the blanking component is located on the workbench in the same direction as the second side, and the blanking component includes a fixing plate, a pressing plate and two outer plates; The fixed plate is connected to the workbench, the extrusion plate and the two outer plates are connected to the fixed plate, the extrusion plate is located below the two outer plates, the two outer plates are respectively connected to the two sides of the fixed plate, the two outer plates are provided with contraction grooves, the contraction grooves are connected with support rods, the outer movable sleeve of the support rod is provided with a contraction block, the outer sleeve of the support rod is provided with a second contraction spring, and the two ends of the second contraction spring are respectively connected to the contraction block and the inner wall of the contraction groove; A third spring telescopic rod is connected to the inner wall of the bottom of the base, the third spring telescopic rod is connected to the bottom of the second movable block, the second movable block is longitudinally movable relative to the second side, and a blanking inclined surface is provided on one side of the second movable block close to the blanking component; A material unloading rack is connected to the workbench, and when the inspection platform is driven to move toward the material unloading component, the material unloading rack is meshed with the gear plate to drive the bidirectional screw to rotate.

[0014] The present invention also discloses a method for testing using a square battery shell airtightness testing device, the method comprising the following steps: S1. Place the battery shell in the base, where the battery shell is located between the two sealing covers. Then start the synchronous moving mechanism to drive the two sealing covers to move toward each other and dock. After docking, the two sealing covers form a whole and cooperate with the base to wrap the battery shell inside. The top inner walls of the two sealing covers abut against the top open end of the battery shell to form a seal. Then, drive the cover plate to move toward the air inlet cavity formed after the two sealing covers are docked by the lifting component until the cover plate is moved to the top of the two sealing covers to form a seal. Finally, start the steam generator to pass steam into the battery shell through the first air inlet. When there is a leak in the battery shell, the steam in the battery shell flows out from the leak into the cavity and is sprayed onto the glass sealing cover and / or the base at a position corresponding to the leak. At the same time, a mist point is formed on the glass material to locate the leak on the battery shell. S2. When there is no leakage point in the battery shell after steam is introduced into the battery shell, the steam introduced into the battery shell causes the battery shell to move downward as a whole, and the battery shell squeezes the longitudinal contraction mechanism, so that the overall height of the battery shell decreases, while the height of the sealing cover remains unchanged. At this time, the top of the sealing cover loses contact and sealing with the top of the battery shell, and all the steam in the battery shell leaks into the cavity, thereby preventing the battery shell from deforming.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. Through the arrangement of structures such as the sealing cover and the steam generator, the two sealing covers are moved and docked, and then cooperated with the base for placing the battery shell to fully cover the entire battery shell. The top of the sealing cover generates pressure on the top of the battery shell, and the longitudinal contraction mechanism at the bottom of the battery shell generates a reaction force, thereby realizing the sealing setting between the sealing cover and the battery shell. At the same time, the longitudinal contraction mechanism also improves the adaptability to battery shells of different heights. After sealing, steam passes through the steam generator from the air inlet cavity into the interior of the battery shell. The leakage point on the battery shell sprays steam onto the sealing cover and / or the base made of glass, which can be directly observed. The position of the leakage point of the battery shell can be obtained by comparing the mark of the fog residue on the glass with the battery shell. When the battery shell is sealed intact, the continuous pressurization of the steam will squeeze the longitudinal contraction mechanism and cause the entire battery shell to drop, thereby realizing automatic pressure relief and avoiding damage to the battery shell itself.

[0016] 2. By setting up structures such as an air blower and a condenser, a partition is set inside the sealing cover to divide the cavity formed between the sealing cover and the battery shell into two areas. When the battery shell leaks, steam is directly sprayed on the glass partition to produce fog residue, thereby locating the leakage point. When the fog residue is not obvious, the sealing cover as a whole and the partition are cooled by the condenser. After cooling, the fog residue is more obvious. When the detection is completed, the air blower removes the generated fog residue points by blowing out dry gas, while avoiding excessive generation of condensed water.

[0017] 3. Through the setting of the first industrial camera and the second industrial camera and other structures, the first industrial camera and the second industrial camera respectively shoot the battery shell from the bottom and the side to achieve all-round recording and positioning of leakage points. The rotating mechanism drives the second industrial camera to shoot at multiple angles to ensure no-dead-angle detection. The image data is transmitted to the control system in real time, supporting automated analysis and report generation, and improving detection efficiency and data traceability.

[0018] 4. Through the setting of structures such as the front and rear adjustment mechanism and the left and right adjustment mechanism, the front and rear adjustment mechanism and the left and right adjustment mechanism are adaptively adjusted through the spring telescopic rod and the contact block, and are compatible with battery shells of different sizes and shapes, so that battery shells of different sizes are always located at the center of the base, so that subsequent steam can quickly cover the entire battery shell. The second air vent and the third air vent ensure that the battery shell is balanced with the external air pressure to avoid detection errors, and also reduce the detection blind spots caused by positioning the battery shell.

[0019] 5. Through the arrangement of the feeding component, the height limiting component and the unloading component and other structures, the entire testing platform can be moved on the workbench driven by the driving motor and the threaded rod, and the sealing cover can be automatically opened and closed during the movement. The material can be automatically received when moving to the feeding component, and the battery shells of different heights can be pressed to a uniform height through the height limiting component, so that the subsequent sealing cover can wrap the entire battery shell, and then the airtightness test can be carried out. After the test is completed, it will continue to move to the unloading component for automatic unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the test bench and air intake assembly of the present invention; Figure 4 The overall schematic diagram of the detection platform of the present invention is Figure 1 ; Figure 5 The overall schematic diagram of the detection platform of the present invention is Figure 2 ; Figure 6 This is a schematic diagram of the exterior of the sealing cover of the present invention after docking; Figure 7 This is a schematic diagram of the interior of the sealing cover of the present invention after docking; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Fig. 9 The sealing cover structure of the present invention is shown in FIG. Figure 1 ; Fig.10 is a cross-sectional view of the sealing cover of the present invention; Fig.11 The sealing cover structure of the present invention is shown in FIG. Figure 2 ; Fig.12 It is a schematic diagram of the structure of the recording component of the present invention; Fig.13 For the present invention Fig.12 Enlarged view of point B in the middle; Fig.14 The base structure of the present invention is shown in FIG. Figure 1 ; Fig.15 For the present invention Fig.14 Enlarged view of point C in the middle; Fig.16 The base structure of the present invention is shown in FIG. Figure 2 ; Fig.17 For the present invention Fig.16 Enlarged view of point D in the middle; Fig.18 For the present invention Fig.16 Enlarged view of point E in the middle; Fig.19 It is a schematic diagram of the arrangement structure of the workbench of the present invention; Fig. 20 It is a schematic diagram of the structure of the feeding component of the present invention; Fig.21 It is a schematic diagram of the structure of the height limiting component of the present invention; Fig. 22 It is a schematic structural diagram of the blanking component of the present invention; Fig.23 It is a schematic structural diagram of the structure for rotating the shrinking block of the present invention.

[0021] In the figure: 1, workbench; 2, testing table; 21, support seat; 22, base; 23, gear plate; 24, bidirectional screw; 25, transmission sleeve; 26, sealing cover; 27, air inlet cavity; 28, cavity; 29, first sealing pad; 210, sealing groove; 3. Air intake assembly; 31. Steam generator; 32. Cover plate; 33. Air intake sleeve; 34. Cylinder; 35. Second sealing gasket; 36. Mounting plate; 37. Impeller; 38. First air intake port; 4. Bracket; 5. Cleaning assembly; 51. Blower; 52. Second air inlet; 53. First collecting plate; 54. Water outlet; 6. Matching assembly; 61. Condenser; 62. Third air inlet; 63. Second collecting plate; 64. Partition; 65. Cold air cavity; 66. Normal temperature cavity; 67. Bottom cold air channel; 68. Side cold air channel; 69. Air vent; 7. Recording assembly; 71. First industrial camera; 72. Second industrial camera; 73. Camera adjustment frame; 74. Rotating motor; 75. Driving gear; 76. Driven gear; 13. Longitudinal contraction mechanism; 1301. Longitudinal contact block; 1302. First spring telescopic rod; 1303. First vent hole; 8. Adjustment assembly; 81. Front-to-rear adjustment mechanism; 82. Left-to-right adjustment mechanism; 83. Fixed rod; 84. First contraction spring; 85. First movable block; 86. Front contact block; 87. Second vent hole; 88. Second spring telescopic rod; 89. Stopper; 810. Loading inclined plane; 811. Third spring telescopic rod; 812. Second movable block; 813. Fourth spring telescopic rod; 814. Rear contact block; 815. Third vent hole; 816. Unloading inclined plane; 817. Fifth spring telescopic rod; 818. Side contact block; 819. Front inclined plane; 820. Upper inclined plane; 821. First side; 822. Second side; 823. Third side; 824. Fourth side; 9. Linear moving mechanism; 91. Driving motor; 92. Threaded rod; 93. Moving plate; 10. Loading component; 1001. Placing plate; 1002. First channel; 1003. Vertical plate; 1004. Second channel; 1005. Loading rack; 11. Height limiting component; 1101. Height limiting frame; 1102. Height limiting block; 1103. Guide ramp; 12. Unloading component; 1201. Fixed plate; 1202. Extrusion plate; 1203. Outer plate; 1204. Contraction block; 1205. Support rod; 1206. Second contraction spring; 1207. Unloading rack. DETAILED DESCRIPTION

[0022] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0023] Embodiment 1: Figure 1-6 As shown, a square battery shell airtightness detection device includes: Workbench 1; The test bench 2 is placed on the workbench 1, and the test bench 2 includes a base 22, a synchronous moving mechanism and two sealing covers 26. The base 22 is located above the workbench 1. The base 22 and the two sealing covers 26 are made of glass. The base 22 is suitable for placing a battery shell. The synchronous moving mechanism is respectively connected to the two sealing covers 26 and the base 22 to drive the two sealing covers 26 to move toward each other, dock and wrap the battery shell. A cavity 28 is formed between the battery shell, the sealing cover 26 and the base 22. After the two sealing covers 26 are docked, an air intake square cavity 27 is formed, and the air intake square cavity 27 is communicated with the opening of the battery shell. An air intake assembly 3, a support 4 is connected to the workbench 1, the air intake assembly 3 includes a steam generator 31, a cover plate 32, an air intake sleeve 33 and a lifting component connected to the support 4, a first air intake port 38 communicating with the air intake sleeve 33 is opened on the cover plate 32, the cover plate 32 is connected to the air intake sleeve 33, the air intake sleeve 33 is connected to the steam generator 31, the lifting component is connected to the air intake sleeve 33 to drive the air intake sleeve 33 to move longitudinally, the cover plate 32 is suitable for being driven to move and cover the air intake square cavity 27, and then the steam is passed into the battery shell; The longitudinal contraction mechanism 13 is connected to the base 22 and is located between the battery shell and the base 22 .

[0024] like Figure 4-6 , Figure 11-13 , Fig.15As shown, the synchronous movement mechanism includes a bidirectional screw 24 and two transmission sleeves 25 respectively connected to the sealing cover 26. The bidirectional screw 24 is rotatably mounted on one side of the base 22. The two transmission sleeves 25 are respectively assembled on two opposite threads of the bidirectional screw 24. The bidirectional screw 24 is suitable for being moved to rotate, thereby driving the two sealing covers 26 to move in opposite or opposite directions along the axis of the bidirectional screw 24. The lifting component is a cylinder 34. A sealing groove 210 is provided on each of the two sealing covers 26, and a second sealing gasket 35 is provided at the bottom of the cover plate 32. The second sealing gasket 35 is adapted to be inserted into the sealing groove 210 when being driven to move toward the sealing cover 26. A first sealing gasket 29 is provided in each of the two sealing grooves 210. The first sealing gasket 29 is adapted to be pressed with the top of the battery shell to form a seal when the corresponding sealing cover 26 moves toward the battery shell; The longitudinal contraction mechanism 13 includes a longitudinal contact block 1301 and a first spring telescopic rod 1302. One end of the first spring telescopic rod 1302 is connected to the base 22, and the longitudinal contact block 1301 is connected to the other end of the first spring telescopic rod 1302. The longitudinal contact block 1301 is suitable for supporting the bottom of the battery shell, and a first air vent 1303 communicating with the outside world is opened in the longitudinal contact block 1301.

[0025] like Figure 1-2 , Figure 7-11 As shown, the detection equipment also includes a cleaning component 5, which includes an air blower 51 and two first collecting plates 53. The two sealing covers 26 are each provided with a second air inlet 52 that runs through the two first collecting plates 53. The two first collecting plates 53 correspond to the two sealing covers 26 respectively. The first collecting plates 53 are connected to the corresponding sealing covers 26. The first collecting plates 53 are suitable for covering the second air inlet 52 opened on the corresponding sealing covers 26. The two first collecting plates 53 are both connected to the air blower 51 through a hose. A water outlet trough 54 is provided in the base 22, and the water outlet trough 54 is communicated with the outside.

[0026] like Figure 1-2 , Figure 7-11 As shown, the detection device further includes a matching component 6, which includes a condenser 61, two partitions 64 corresponding to the sealing cover 26, and two second collecting plates 63 corresponding to the sealing cover 26, and the partitions 64 are made of glass; The two sealing covers 26 are each provided with a third air inlet 62 penetrating therethrough, the second collecting plate 63 is connected to the corresponding sealing cover 26 and covers the corresponding third air inlet 62, and the two second collecting plates 63 are both connected to the condenser 61 through a hose; The partition 64 is arranged in the corresponding sealing cover 26, and the partition 64 is suitable for dividing the cavity 28 into a normal temperature cavity 66 and a cold air cavity 65. The normal temperature cavity 66 is communicated with the second air inlet 52, and the cold air cavity 65 is communicated with the third air inlet 62. The sealing cover 26 is provided with a side cold air channel 68 on the inner wall within the range of the cold air cavity 65. The side cold air channel 68 is suitable for introducing the cold air in the cold air cavity 65 into the remaining surface that is not in direct contact with the cold air cavity 65. The bottom of the partition 64 is provided with an air vent 69 that runs through itself, and a bottom cold air channel 67 is provided in the base 22. When the sealing cover 26 is driven and contacts with the base 22, the air vent 69 is communicated with the bottom cold air channel 67. The bottom cold air channel 67 is suitable for introducing the cold air in the cold air cavity 65 into the entire surface of the base 22, and the bottom cold air channel 67 is not communicated with the water outlet 54.

[0027] like Fig.13 As shown, two mounting plates 36 are connected to the bottom of the base 22, and impellers 37 are rotatably mounted in the two mounting plates 36. The two impellers 37 are both located at the air outlet of the first air inlet 38. The two impellers 37 are arranged alternately, and the two impellers 37 are suitable for being driven by the steam discharged from the first air inlet 38 to rotate in opposite directions.

[0028] like Fig.12 As shown, the detection device further includes a recording component 7, which includes a first industrial camera 71, a second industrial camera 72, and a rotating mechanism connected to the second industrial camera 72; The rotating mechanism includes a rotating motor 74, a driving gear 75 and a driven gear 76. The rotating motor 74 is mounted on the bracket 4. The driving gear 75 and the driven gear 76 are both rotatably mounted on the bracket 4. The driving gear 75 is connected to the rotating motor 74. The driving gear 75 is meshed with the driven gear 76. The driven gear 76 is fixedly connected with a camera adjustment frame 73. The second industrial camera 72 is mounted on the camera adjustment frame 73. A protrusion is connected to the bottom of the base 22, and the bottom of the protrusion is connected to the support base 21. There is a gap between the support base 21 and the base 22. The first industrial camera 71 is installed on the support base 21. The lens of the first industrial camera 71 corresponds to the bottom surface of the base 22, thereby detecting the bottom sealing state of the battery shell.

[0029] The working principle of this embodiment is as follows: When in use, first, the two sealing covers 26 are in an open state. At this time, there is enough space between the two sealing covers 26 to place the battery shell directly inside the base 22, with the battery shell opening facing upward. Since the bottom of the battery shell is directly placed on the base 22, the bottom surface cannot be properly tested for air tightness. Therefore, a longitudinal contraction mechanism 13 is provided in the base 22, and the battery shell is placed on a longitudinal contraction block 1204 in the longitudinal contraction mechanism 13. A first spring telescopic rod 1302 is provided at the bottom of the longitudinal contraction block 1204 to provide space for changing the height of the battery shell. A first air vent 1303 is provided in the longitudinal contraction block 1204. This arrangement can avoid the longitudinal contraction block 1204 used to support the battery shell from causing a detection blind spot for the part of the battery shell that contacts the battery shell. When there is air leakage in the contact part, steam can also be observed through the first air vent 1303. This step is the placement of the battery shell. After the battery shell is placed, it is necessary to rotate the bidirectional screw 24 to drive the two transmission sleeves 25 assembled on the bidirectional screw 24 to move toward each other. The transmission sleeve 25 and the bidirectional screw 24 can be assembled through a ball nut. The specific working principle of the bidirectional screw 24 driving the two components to move toward or in the opposite direction is the existing technology and will not be described in detail here. When the two transmission sleeves 25 are driven to move toward each other, the two sealing covers 26 can move toward each other, thereby completing the docking of the two sealing covers 26. After docking, the first sealing gasket 29 in the sealing cover 26 will squeeze the surface of the open end of the battery shell. The squeezed battery shell moves downward, squeezing the first spring telescopic rod 1302. The first spring telescopic rod 1302 generates a reaction force, so that a tight sealing effect is formed between the battery shell and the first sealing gasket 29. It should be noted that different battery shells or the same battery shells will There are larger or smaller size differences. Therefore, when the first sealing gasket 29 in the sealing cover 26 is about to contact the battery shell, the battery shell can be pressed manually or by other electronically controlled pressure generation methods to press the height of the battery shell to be lower than the height of the first sealing gasket 29, so as to avoid the interference of the battery shell with the docking movement of the sealing cover 26 due to its own height problem. After the sealing cover 26 is docked, the two sealing covers 26 cooperate with the base 22 to form a comprehensive seal for the battery shell except the opening. It should be noted that the sealing cover 26 and the base 22 can also be sealed, but there is no strict sealing requirement. After the two sealing covers 26 are docked, an air intake square cavity 27 is formed. The air intake square cavity 27 can unify the opening ends of battery shells of different sizes. At the same time, a cavity 28 is formed between the sealing cover 26 and the base 22 and the battery shell. This step completes the preparation work before the air tightness test; After the sealing cover 26 is docked, the inspection work officially begins. First, the cylinder 34 is started to drive the cover plate 32 and the air intake sleeve 33 to move as a whole toward the direction of the battery shell. Since the battery shells of different sizes have been set with height adaptive adjustment in advance and are covered by the sealing cover 26 with constant height, the height to which the cylinder 34 drives the cover plate 32 to descend is fixed and is not affected by battery shells of different sizes. The cover plate 32 is lowered until it contacts the two sealing covers 26. At this time, the cover plate 32 completely covers the air intake cavity 27. At the same time, the second sealing gasket 35 on the cover plate 32 is inserted into the sealing groove 210 opened on the two sealing covers 26. At this time, the sealing between the cover plate 32 and the sealing cover 26 is completed. After sealing, the steam generator 31 is started, and the temperature of the steam generator 31 is pre-adjusted to prevent damage to the battery shell. Yes, after the steam generator 31 is started, the steam is introduced into the interior of the battery shell through the first air inlet 38 on the cover plate 32, and the steam inside the battery shell is continuously pressurized. When there is a leak in the battery shell, the steam inside the battery shell will flow into the cavity 28 through the leak, and because the leak is very small, the gushing steam will be sprayed onto the base 22 and / or the sealing cover 26 in a nearly straight line. Since the base 22 and the sealing cover 26 are both made of glass, the spraying of steam will leave residual mist on them, and the residual point of the mist corresponds to the leak on the battery shell. The position of the leak on the battery shell can be obtained with high accuracy by observation and recording. At the same time, the first air vent 1303 can guide the steam leaked from the part of the battery shell in contact with the longitudinal contact block 1301 to the glass to reduce dead angles. When there is no leakage in the battery shell (i.e., the airtightness is intact), at this time, since the steam inside the battery shell is still pressurized, and since there is no air release treatment at the leakage point, when the pressure reaches a certain level, the battery shell as a whole will be pushed downward by the pressure of the steam, and then the battery shell will further squeeze the first spring telescopic rod 1302. At this time, the further position of the battery shell inside the sealing cover 26 will cause the seal between the battery shell and the first sealing gasket 29 to fail. At this time, the steam accumulated in the battery shell will complete the pressure release by pouring into the cavity 28. After this phenomenon is observed, the detection can be stopped, and it is considered that the airtightness is qualified. It should be noted that the tightness of the first spring telescopic rod 1302 needs to be adapted through multiple experiments. Even if the battery shell cannot be accurately pressed down by the steam, it can be judged by time. When there is still no residual fog on the glass after a certain period of time, the detection can be stopped, and it is considered that the airtightness is qualified. In addition, since each time a leak is detected during the steam detection work, fog residue will be left on the glass. If the fog residue is not handled in time, it will affect the next detection and condensed water residue. Therefore, a second air inlet 52 is provided on the sealing cover 26. By starting the blower 51, dry gas is passed into the first collecting plate 53 through a hose. The dry gas in the first collecting plate 53 is blown onto the entire inner wall of the sealing cover 26 through the second air inlet 52, thereby wiping off the fog residue and reducing the possibility of condensed water generation. When the two sealing covers 26 are still in a docking state, the dry gas introduced by the second air inlet 52 can directly act on the base 22, and the fog residue on the base 22 is also handled accordingly. Even if the dry gas does not completely avoid the generation of condensed water, all the condensed water can be blown into the base 22 through the flow of gas, and then the condensed water is discharged from the inside of the base 22 through the water outlet 54 under continuous blowing. This step can prevent a single detection from causing adverse effects on subsequent detections. In addition, since the detection of steam depends on the generation of fogging points, and the generation of fogging points depends on the temperature difference, when the temperature sprayed on the glass is almost the same as the temperature of the glass itself, even if a fogging point can be generated, it will be extremely difficult to observe. Therefore, this problem is solved by adding a glass partition 64 in the sealing cover 26. At this time, the steam sprayed out is changed from being sprayed on the sealing cover 26 to being sprayed on the partition 64. Correspondingly, the dry gas blown out through the second air inlet 52 is also changed to act on the partition 64 and the base 22. At this time, the area between the partition 64 and the battery shell is a normal temperature chamber 66, and the area between the partition 64 and the sealing cover 26 is a cold air chamber 65. The condenser 61 is started and the cold air is introduced into the second collecting plate 63 through a hose. The cold air in the second collecting plate 63 is introduced into the cold air chamber 65 through the setting of the third air inlet 62. The cold air in the cold air chamber 65 can be guided to the other surfaces of the sealing cover 26 through the side cold air channel 68, thereby achieving the entire The cold air of the sealing cover 26 and the partition 64, when the steam is sprayed onto the partition 64, a clearly visible fogging point residue will be left. At the same time, since the two sealing covers 26 are in a docking state, the sealing cover 26 is in contact with the base 22. At this time, the bottom of the partition 64 is in contact with the base 22, and the air vent 69 opened at the bottom of the partition 64 is connected with the bottom cold air channel 67 opened on the base 22, thereby introducing the cold air in the cold air cavity 65 into the entire base 22, so that the temperature of the base 22 is reduced. When there is a leak at the bottom of the battery shell, the sprayed steam can also be clearly left on the base 22. It should be noted that the bottom cold air channel 67 is not connected to the water outlet 54. At the same time, since the contact sealing requirements between the sealing cover 26 and the base 22 are not strict, there may be a problem of cold air leakage, but a slight leakage will not excessively affect the cooling treatment of the sealing cover 26 and the base 22. If the impact is large, the sealing treatment after the direct contact between the sealing cover 26 and the base 22 can be strengthened; It should be noted that since the sealing cover 26 and the base 22 are both made of glass materials, but other components are connected to the outside of them, and since the combination of the base 22 and the sealing cover 26 is suitable for wrapping the entire battery shell as a whole, the size of the base 22 and the sealing cover 26 is much larger than the size of battery shells of various sizes, even if various components are connected to the sealing cover 26 and the base 22, serious obstruction of the fogging point caused by the leakage point can be avoided. Slight obstruction can still determine the position corresponding to the fogging point and the leakage point. The sealing cover 26 is set to open left and right in order to better observe the position of the fogging point. When necessary, the sealing cover 26 can be opened for observation, and the overall height of the equipment is reduced. As for the various components connected to the sealing cover 26 and the base 22, they can be connected by gluing or nesting holes in the glass or bolts. This part belongs to the prior art and will not be described in detail here. It is sufficient to be able to connect. Figure 1 and Figure 2 The middle sealing cover 26 should be in a closed state, which is convenient for display. Figure 6 The status displayed; The above-mentioned observation of fogging points mainly adopts the method of manual identification. This method is not comprehensive enough in capturing information and is not traceable. Therefore, a first industrial camera 71 and a second industrial camera 72 are provided. The specific functions of the two industrial cameras can be selected according to actual use requirements, and can ensure normal photo taking, video recording, storage and wireless transmission functions. A polarizing filter should be used to eliminate the interference of glass reflection. The first industrial camera 71 is installed on the support seat 21, and its lens is aimed at the bottom of the base 22. It is mainly used to monitor whether there is leakage at the bottom of the battery shell and the location of the leakage point, while the second industrial camera 72 drives itself as a whole to perform 360° rotation detection around the entire test bench 2 through a rotating mechanism. With the cooperation of the two industrial cameras, the test can be carried out without blind spots. The state after the test is recorded and stored, and the battery shells with unqualified airtightness are subsequently processed accordingly. The rotating mechanism mainly drives the driving gear 75 to rotate by starting the rotating motor 74, and then drives the gear to rotate. At this time, the driven gear 76 drives the camera adjustment frame 73 connected to it to rotate, and the second industrial camera 72 is installed on the camera adjustment frame 73. It should be noted that the center position of the driven gear 76 should be coaxially arranged with the center position of the detection table 2. The second industrial camera 72 does not interfere with the output hoses of the blower 51 and the condenser 61 when rotating and recording. The parts of the blower 51 and the condenser 61 close to the corresponding sealing cover 26 can be fixed on the corresponding sealing cover 26 through a limit plate to reduce interference with the rotating second industrial camera 72; When steam enters the battery shell through the first air inlet 38 on the cover plate 32, the continuously inflowing airflow drives the two impellers 37 provided at the bottom of the cover plate 32 to rotate. The two impellers 37 are arranged crosswise, and driven by the airflow, the two impellers 37 rotate in opposite directions. The two impellers 37 rotating in opposite directions drive the steam to form a vortex inside the battery shell. The generation of the vortex can accelerate the steam to pass through the position where the leakage point exists, thereby improving the efficiency of the entire air tightness detection.

[0030] Embodiment 2: Figure 14-18 As shown, this embodiment further includes the following structure on the basis of the first embodiment: an adjustment assembly 8 is arranged in the base 22, and the adjustment assembly 8 includes a front-rear adjustment mechanism 81 and a left-right adjustment mechanism 82; The front-rear adjustment mechanism 81 includes a first movable block 85 and a second movable block 812. The base 22 includes four surfaces on the inner cavity for accommodating the battery shell, namely a first side 821, a second side 822, a third side 823 and a fourth side 824. The first movable block 85 is arranged on the first side 821. A second spring telescopic rod 88 is connected to the first movable block 85. The other end of the second spring telescopic rod 88 is connected to a front contact block 86. The front contact block 86 is suitable for contacting the battery shell. A second air vent 87 communicating with the outside is opened in the front contact block 86. The second movable block 812 is arranged on the second side 822, the first side 821 and the second side 822 are opposite to each other, the second movable block 812 is connected with a fourth spring telescopic rod 813, the other end of the fourth spring telescopic rod 813 is connected with a rear contact block 814, the rear contact block 814 is suitable for contacting with the battery shell, and a third vent hole 815 communicating with the outside is opened in the rear contact block 814; The left and right adjustment mechanism 82 includes two fifth spring telescopic rods 817, which are respectively connected to the third side 823 and the fourth side 824. The third side 823 and the fourth side 824 are relative to each other. The two fifth spring telescopic rods 817 are respectively connected to side contact blocks 818, which are suitable for contacting the battery shell.

[0031] The working principle of this embodiment is as follows: An adjustment assembly 8 consisting of a front-rear adjustment mechanism 81 and a left-right adjustment mechanism 82 is provided in the base 22, and its purpose is to quickly fix battery shells of various sizes at the center of the base 22. When the battery shell is centered, the steam is evenly diffused from the air inlet cavity 27 to all inner walls, avoiding the phenomenon of uneven local steam pressure caused by offset, and ensuring that small leakage points (such as welds and bends) can be effectively detected. The shooting reference of the first industrial camera 71 and the second industrial camera 72 takes the center of the base 22 as the origin. Centering and fixing can avoid image distortion or coordinate mapping error caused by battery shell offset, and the positioning accuracy is more stable. When the two sealing covers 26 are closed, the second sealing gasket 35 thereof needs to be accurately aligned with the top of the battery shell. Centering and fixing ensure uniform pressure on the sealing contact surface to avoid local leakage caused by deflection. For this part, the size of the second sealing gasket 35 should be larger than the maximum size of the battery shell to be detected; The specific positioning method is to press any of the four contact blocks, namely the front contact block 86, the rear contact block 814, and the two side contact blocks 818. After pressing, the contact block 814 squeezes the spring telescopic rod connected to it to shift the position until the battery shell can be placed entirely between the four contact blocks, and the bottom surface of the battery shell is in contact with the longitudinal contact block 1301. After the battery shell is placed, release the previously pressed contact block to reset the spring telescopic rod connected to it. The second spring telescopic rod 88 corresponding to the front contact block 86, the fourth spring telescopic rod 813 corresponding to the rear contact block 814, and the two fifth spring contact blocks corresponding to the two side contact blocks 818, a total of four spring telescopic rods, are reset at the same time and squeeze the battery shell between the four. The four spring telescopic rods will adjust themselves so that the four spring telescopic rods are subjected to the same force. At this time, the battery shell is automatically positioned at the center of the base 22. It should be noted that elastic materials are provided on the surfaces of the front contact block 86, the rear contact block 814, the two side contact blocks 818 and the bottom longitudinal contact block 1301 that are in contact with the battery shell to avoid damage to the surface of the battery shell. The elastic material may be rubber or the like. At the same time, a second air hole 87 is provided in the front contact block 86, and a third air hole 815 is provided in the rear contact block 814. The functions of these two air holes are the same as those of the first air hole 1303, and both are to avoid the problem of blind spots in detection due to contact and support with the battery shell, so that the steam ejected from the leakage points on the part of the battery shell that is in contact with it can be discharged through the corresponding air holes and sprayed onto the glass again.

[0032] Embodiment 3: Figure 19-21 , Figure 14-15 , Fig.18 As shown, this embodiment further includes the following structure on the basis of the first embodiment: a linear moving mechanism 9 is arranged in the workbench 1, and the linear moving mechanism 9 includes a driving motor 91, a threaded rod 92 and a moving plate 93. The driving motor 91 is installed on the workbench 1, and the threaded rod 92 is rotatably installed in the workbench 1. The moving plate 93 is assembled on the threaded rod 92, and the moving plate 93 is connected to the support seat 21. The driving motor 91 is connected to the threaded rod 92 so as to drive the moving plate 93 to move along the axis direction of the threaded rod 92. It should be noted that when the detection platform moves, the air blower 51 and the condenser 61 connected thereto are stationary, so a longer hose should be used for connection. When the detection platform moves, the hose moves in the hollow part of the workbench to ensure that the movement of the detection platform will not cause the air blower 51 and the condenser 61 to be disconnected from the detection platform; A loading component 10 is provided on one side of the workbench 1. The loading component 10 is located on the workbench 1 in the same direction as the first side 821. The loading component 10 includes a placement plate 1001 and a vertical plate 1003. The placement plate 1001 is connected to the workbench 1. The vertical plate 1003 is connected to the placement plate 1001. A first channel 1002 is provided on the placement plate 1001. A second channel 1004 is provided on the vertical plate 1003. The first channel 1002 is communicated with the second channel 1004. The first channel 1002 and the second channel 1004 are both suitable for providing space for the first movable block 85 to pass through. A gear plate 23 is fixedly connected to the bidirectional screw 24. A loading rack 1005 is connected to the workbench 1. When the inspection platform 2 is driven to move toward the loading component 10, the loading rack 1005 is meshed with the gear plate 23 to drive the bidirectional screw 24 to rotate. The first movable block 85 is rotatably arranged relative to the first side 821, and a loading inclined surface 810 is arranged on the side of the first movable block 85 close to the loading component 10. A fixed rod 83 is connected between the third side 823 and the fourth side 824. The first movable block 85 is movably sleeved on the outside of the fixed rod 83, and two first contraction springs 84 are sleeved on the fixed rod 83, wherein two ends of one of the first contraction springs 84 are respectively connected to the first movable block 85 and the third side 823, and two ends of the other first contraction spring 84 are respectively connected to the first movable block 85 and the fourth side 824, and a stopper 89 is connected to the first side 821; A height limiting component 11 is arranged on the workbench 1, and the height limiting component 11 includes a height limiting frame 1101 and a height limiting block 1102. The height limiting frame 1101 is connected to the workbench 1, and the height limiting block 1102 is connected to the height limiting frame 1101. The height limiting block 1102 is located at the center of the height limiting frame 1101, and guide slopes 1103 are arranged on both sides of the height limiting block 1102. When the detection platform 2 is driven by the linear moving mechanism 9 to move toward the loading component 10, it first passes through the height limiting component 11, and an upper slope 820 is provided on the top of the side contact block 818, and a front slope 819 is provided on the side of the side contact block 818 close to the loading component 10.

[0033] like Figure 22-23 , Figure 16-17 As shown, a blanking component 12 is provided on the other side of the workbench 1. The blanking component 12 is located on the workbench 1 at the same side as the second side 822. The blanking component 12 includes a fixing plate 1201, a pressing plate 1202 and two outer plates 1203. The fixed plate 1201 is connected to the workbench 1, the extrusion plate 1202 and the two outer plates 1203 are connected to the fixed plate 1201, the extrusion plate 1202 is located below the two outer plates 1203, the two outer plates 1203 are respectively connected to the two sides of the fixed plate 1201, the two outer plates 1203 are provided with contraction grooves, the contraction grooves are connected with support rods 1205, the outer sleeves of the support rods 1205 are provided with contraction blocks 1204, the outer sleeves of the support rods 1205 are provided with second contraction springs 1206, and the two ends of the second contraction springs 1206 are respectively connected to the contraction blocks 1204 and the inner wall of the contraction groove; A third spring telescopic rod 811 is connected to the inner wall of the bottom of the base 22. The third spring telescopic rod 811 is connected to the bottom of the second movable block 812. The second movable block 812 is longitudinally movable relative to the second side 822. A blanking inclined surface 816 is provided on one side of the second movable block 812 close to the blanking component 12. A feeding rack 1207 is connected to the workbench 1. When the inspection platform 2 is driven to move toward the feeding component 12, the feeding rack 1207 meshes with the gear plate 23 to drive the bidirectional screw 24 to rotate.

[0034] The working principle of this embodiment is as follows: In order to improve the automation degree of the overall operation of the equipment, a loading component 10, a height limiting component 11 and a discharging component 12 are provided to automate the entire working process. The specific workflow is as follows: the testing platform 2 is initially located near the loading component 10, and continues to move to the loading component 10 through the linear moving mechanism 9, completes automatic loading during the movement, and then moves to the cover plate 32. During the movement, it passes through the height limiting component 11 to limit the height of battery shells of different heights. After the height limiting treatment, the sealing cover 26 is automatically closed to wrap the battery shell. After wrapping, the testing platform 2 comes under the cover plate 32, and the cover plate 32 is docked with the sealing cover 26 through the cylinder 34 and begins to detect. After the detection, it is recorded by two industrial cameras. After the recording is completed, the cover plate 32 is disconnected from the sealing cover 26, and the testing platform 2 continues to move to the discharging component 12 as a whole. The sealing cover 26 automatically opens during the movement, and finally completes automatic discharging under the action of the discharging component 12. After the discharging is completed, it continues to move to the loading component 10, and the automatic detection is realized repeatedly. The entire workflow can be controlled by PLC; The linear moving mechanism 9 drives the threaded rod 92 to rotate by starting the driving motor 91. The threaded rod 92 and the moving plate 93 can be assembled through a ball nut. The specific working principle of driving the moving plate 93 to move linearly when the threaded rod 92 rotates is the prior art and will not be described in detail here. The moving plate 93 is connected to the support seat 21, thereby driving the entire detection platform 2 to move linearly along the axis direction of the threaded rod 92. The moving direction of the detection platform 2 is changed by controlling the forward and reverse rotation of the driving motor 91. When automatic loading is required, the inspection table 2 with the sealing cover 26 opened moves toward the placement plate 1001. The placement plate 1001 is used to place the battery shell to be inspected in advance. The bottom of the battery shell is placed on the placement plate 1001, and the battery shell is backed by the vertical plate 1003. The first movable block 85 in the inspection table 2 moving toward the placement plate 1001 moves in the first channel 1002. When the loading shoe surface of the first movable block 85 moves to contact the battery shell, the battery shell backed by the vertical plate 1003 is stationary and generates a thrust on the continuously moving first movable block 85. The first movable block 85 subjected to the thrust rotates on the fixed rod 83 to be received into the base 22, and at the same time twists the first contraction spring 84. When the first movable block 85 continues to move to the second channel 1004 on the vertical plate 1003, when the first movable block 85 loses the thrust generated by the battery shell on itself, the first contraction spring 84 automatically resets, and at the same time drives the entire first movable block 85 to reset. During the continuous movement, the front inclined surfaces 819 on both sides of the battery shell facing the side movable blocks are squeezed, and the side contact blocks 818 and the fifth spring telescopic rod 817 are contracted. The two side contact blocks 818 first position the left and right sides of the battery shell. After squeezing the side movable blocks, as the detection table 2 continues to move, the surface of the battery shell that previously generated thrust on the first movable block 85 is against the rear contact block 814, squeezing the rear contact block 814. The battery shell 100 is pressed, and the reset is completed in the second channel 1004. The entire test platform 2 is driven to move in the reverse direction by the linear moving mechanism 9. During the reverse movement, the front contact block 86 passes through the second channel 1004 and the first channel 1002 again, contacts the surface opposite to the surface that previously generated thrust on the first movable block 85, and pushes the battery shell to move. It should be noted that a stopper 89 is provided in the base 22. The stopper 89 can prevent the front contact block 86 from being squeezed by the battery shell to rotate in the reverse direction when pushing the battery shell to move. When the first movable block 85 is pushed to an angle deviation by the battery shell, the continuously moving first movable block 85 passes under the battery shell. The first movable block 85 under the battery shell to the second channel 100 4 is very short, even if the battery shell is lifted up for a short time under the first movable block 85, it can be quickly restored, and the weight of the battery shell itself can also avoid being lifted up by the first movable block 85. At this time, the battery shell is located between the front contact block 86, the rear contact block 814 and the two side contact blocks 818, and the center positioning is completed by the four contact blocks. At the same time, the bottom of the battery shell is also in contact with the longitudinal contact block 1301, and the whole loading process is completed. The process of placing the battery shells one by one on the placement plate 1001 can be completed manually or by an external conveying device. It should be noted that no matter what method is used to place the battery shell on the placement plate 1001, it is necessary to ensure that the open end of the battery shell faces upward; After the loading is completed, the entire inspection table 2 continues to move toward the cover plate 32, and passes through the height limiting frame 1101 during the movement. The guide slope 1103 on the height limiting block 1102 on the height limiting frame 1101 contacts the battery shell, causing extrusion of the battery shell. The extruded battery shell moves downward and squeezes the longitudinal contact block 1301 and the first spring telescopic rod 1302. The setting of the height limiting block 1102 can make the height of battery shells with different heights uniform by extrusion, which is convenient for the subsequent sealing cover 26 to wrap the entire battery shell. It should be noted that when the size of the height limiting block 1102 itself is not adjusted, the range of automatic extrusion and height limitation of battery shells of different heights by the height limiting block 1102 is limited. The height limiting block 1102 is mainly used for adjusting the height differences caused by tolerances of multiple battery shells with small size differences or the same battery shells due to production. When it is necessary to limit the height of battery shells with large size differences, height limiting blocks 110 of different sizes should be replaced. 2. The range of automatic height limit can be further improved by changing the inclination angle of the guide slope 1103 on the height limit block 1102 and the length of the guide slope 1103. The overall automatic adjustment is still performed for various battery shells with small height differences to avoid the phenomenon that the battery shell cannot pass through the height limit block 1102 normally but is blocked by the height limit block 1102 and squeezed out between the four contact blocks. In the process of the battery shell passing through the height limit block 1102, the battery shell previously only contacts the front contact block 86 and the rear contact block 814 due to problems such as position placement during the loading process, and does not squeeze the front slope 819 of the side contact block 818. The bottom of the battery shell squeezed downward by the height limit block 1102 can squeeze the upper slope 820 of the side contact block 818, and can also enter between the four contact blocks to complete automatic center positioning. At this time, the entire height limit process is completed, and the steps that fail to accurately position the center in the loading link are further improved; After the height limiting step is completed, the continuously moving inspection platform 2 reaches the position of the loading rack 1005, and the gear plate 23 is meshed with the loading rack 1005. During the continuous movement, the gear plate 23 is driven to rotate, thereby driving the continuous rotation of the bidirectional screw 24. At this time, the two sealing covers 26 will begin to move toward each other to wrap the battery shell. It should be noted that in the process of the sealing cover 26 moving to wrap the battery shell, the height limiting block 1102 always maintains a certain contact with the battery shell. When the second sealing gasket 35 on the sealing cover 26 has a certain contact with the top of the battery shell, the height limiting block 1102 102 is completely separated from the battery shell, so it is necessary to control the distance between the feeding rack 1005 and the height limiting block 1102, and the width of the height limiting block 1102 should not be set too large to avoid interference when the sealing cover 26 and the height limiting block 1102 are briefly in contact with the battery shell at the same time. When the gear plate 23 on the continuously moving detection platform 2 is disengaged from the feeding gear, the two sealing covers 26 will also completely wrap the battery shell, and then continue to move to the bottom of the cover plate 32. After the cover plate 32 is docked with the sealing cover 26 through the cylinder 34, the detection work is carried out in the above manner; After the inspection is completed, the inspection platform 2 continues to move toward the lower material component 12. Before contacting the extrusion plate 1202 in the lower material component 12, the gear plate 23 will first mesh with the lower material rack 1207. At this time, the lower material rack 1207 drives the gear plate 23 to rotate in a direction opposite to the rotation direction of the inspection platform 2 driven by the loading gear when it moves from the loading component 10 to the lower material component 12. At this time, the meshing with the lower material rack 1207 drives the two-way screw 24 to rotate and realize the opening of the two sealing covers 26, so as to facilitate the subsequent automatic unloading. After the sealing cover 26 is automatically opened, the height limit of the battery shell is released. Under the reset action of the first spring telescopic rod 1302, the battery shell is lifted up until the bottom surface is flush with the top surface of the base 22, but it is still between the other four contact blocks. At this time, it continues to move toward the lower material component 12 until the lower material slope 816 on the second movable block 812 contacts the extrusion plate 1202. The extrusion plate 1202 applies pressure to the second movable block 812, and the second movable block 812 squeezes the third spring telescopic rod 811, thereby achieving the effect of the second movable block 812 moving downward and retracting into the base 22. When the second movable block 812 is retracted into the base 22, the surface of the battery shell that was originally in contact with the rear contact block 814 loses the contact with the rear contact block 814. The outer plate 1203, which is longer than the extrusion plate 1202, is provided with a rotatable contraction block 1204 on the outer plate 1203. When the contraction block 1204 contacts the battery shell, it will be pushed to an angle by the limited battery shell. When the contraction block 1204 is offset in angle, it will rotate on the support rod 1205 and twist the second contraction spring 1206 at the same time, and finally be received in the contraction groove. The degree of angle deviation of the contraction block 1204 or the degree of receipt in the contraction groove depends on the size of the battery shell. The maximum size of the battery shell can push the entire contraction block 1204 to the inside of the contraction groove. After the contraction block 1204 is pushed into the contraction groove, it continues The movable battery shell can pass between the two outer plates 1203. The length of the outer plate 1203 is longer than the length of the extrusion plate 1202. Therefore, when the extrusion plate 1202 contacts the surface of the battery shell, the contraction block 1204 on the outer plate 1203 also loses contact with the battery shell and is reset through the second contraction spring 1206. At this time, the preparations for automatic unloading are all completed. The driving motor 91 needs to drive the entire inspection platform 2 to move to the upper material component 10 to start the next round of inspection. In this process, the extrusion plate 1202 gradually releases the restriction on the second movable block 812. At the same time, the contraction block 1204 also contacts the surface of the battery shell. The battery shell restricted by the contraction block 1204 cannot move with the inspection platform 2. When the entire inspection table 2 moves to the point where the battery shell loses its support, the battery shell will fall from the hollow part on the workbench 1. A container for storing the battery shell can be placed under the hollow part. Subsequent operators will take them out one by one and number them. By matching the numbers with the data recorded by the previous two industrial cameras, the inspection and traceability of each battery shell can be achieved. It should be noted that since the battery shell is initially lifted up by the first spring telescopic rod 1302 to the bottom surface flush with the top surface of the base 22, when the extrusion plate 1202 gradually releases the restriction on the second movable block 812, the inspection table 2 as a whole is also moving. Instead, the second movable block 812 is driven to move to the bottom of the battery shell. At this time, the battery shell plays a role in restricting the second movable block 812.The battery shell can be separated from the support of the inspection platform 2 only when there is no obstruction from the second movable block 812. When the inspection platform 2 moves toward the upper material component 10, the battery shell will be moved together, but the battery shell is restricted by the shrinking block 1204. The shrinking block 1204 is restricted by the inner wall of the shrinking groove in the direction of the upper material component 10 and cannot rotate. Therefore, the effect of restricting the movement of the battery shell can be achieved, and then the automatic unloading step is completed. The difference in length between the extrusion plate 1202 and the outer plate 1203 is certain, so as to ensure the above effect. For example, the battery shell is of a larger size, so the extrusion plate 1202 extends into the base 2 when it contacts the battery shell. 2 is shorter, but the second movable block 812 is also squeezed into the inside of the base 22. At this time, the distance between the shrinking block 1204 and the battery shell will also become shorter to ensure that when the squeezing plate 1202 gradually releases the restriction on the second movable block 812, the shrinking block 1204 can synchronously start to restrict the battery shell. A small weight sensor or displacement sensor can be set on the contact surface between the squeezing plate 1202 and the battery shell to ensure that a signal can be transmitted to the controller at the same time of contact to stop the continuous movement of the detection platform 2. The same effect can be achieved without setting a sensor, but the front contact block 86 will be further squeezed, and the final automatic unloading result will remain unchanged; After the automatic unloading is completed, the detection table 2 moving to the loading component 10 will first pass through the unloading rack 1207. At this time, the sealing cover 26 will close again, and then pass through the bottom of the cover plate 32. At this time, there is no battery shell in the base 22 and no detection is required. It passes directly and then contacts the loading rack 1005. At this time, the sealing cover 26 will open, and then pass through the height limit frame 1101, and finally come to the loading component 10 in an open state to perform the second round of loading work, and the automatic loading and unloading and detection work is realized over and over again.

[0035] Embodiment 4: This embodiment also provides a method for testing using the square battery case airtightness testing device in Embodiment 1, the method comprising the following steps: S1. Place the battery shell in the base 22. At this time, the battery shell is located between the two sealing covers 26. Then, start the synchronous moving mechanism to drive the two sealing covers 26 to move toward each other and dock. After docking, the two sealing covers 26 form a whole and cooperate with the base 22 to wrap the battery shell inside. The top inner walls of the two sealing covers 26 abut against the top open ends of the battery shell to form a seal. Then, drive the cover plate 32 to move to the air inlet cavity 27 formed after the two sealing covers 26 are docked by the lifting component until the cover plate 32 is moved to the top of the two sealing covers 26 to form a seal. Finally, start the steam generator 31 to pass steam into the battery shell through the first air inlet 38. When there is a leak in the battery shell, the steam in the battery shell flows out from the leak into the cavity 28 and is sprayed onto the glass sealing cover 26 and / or the base 22 at a position corresponding to the leak. At the same time, a mist point is formed on the glass material to locate the leak on the battery shell. S2. When steam is introduced into the battery shell and there is no leakage point in the battery shell, too much steam is introduced into the battery shell, causing the battery shell to move downward as a whole, squeezing the longitudinal contraction mechanism 13 while moving, causing the overall height of the battery shell to drop, while the height of the sealing cover 26 remains unchanged. At this time, the top of the sealing cover 26 loses contact and sealing with the top of the battery shell, and all the steam in the battery shell leaks into the cavity 28, preventing the battery shell from deforming.

[0036] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A square battery shell airtightness detection device, characterized in that: include: Workbench (1); A test bench (2) placed on the workbench (1), the test bench (2) comprising a base (22), a synchronous moving mechanism and two sealing covers (26), the base (22) being located above the workbench (1), the base (22) and the two sealing covers (26) being both made of glass, the base (22) being suitable for placing a battery shell, the synchronous moving mechanism being respectively connected to the two sealing covers (26) and the base (22) so as to be suitable for driving the two sealing covers (26) to move towards each other to dock and wrap the battery shell, a cavity (28) being formed between the battery shell, the sealing cover (26) and the base (22), an air intake square cavity (27) being formed after the two sealing covers (26) are docked, and the air intake square cavity (27) is communicated with an opening of the battery shell; An air intake assembly (3), wherein the workbench (1) is connected to a support (4), the air intake assembly (3) comprising a steam generator (31), a cover plate (32), an air intake sleeve (33), and a lifting component connected to the support (4), the cover plate (32) being provided with a first air intake port (38) communicating with the air intake sleeve (33), the cover plate (32) being connected to the air intake sleeve (33), the air intake sleeve (33) being connected to the steam generator (31), the lifting component being connected to the air intake sleeve (33) so as to drive the air intake sleeve (33) to move longitudinally, the cover plate (32) being adapted to be driven to move and cover the air intake square cavity (27), thereby allowing steam to pass into the battery shell; A longitudinal contraction mechanism (13), the longitudinal contraction mechanism (13) being connected to the base (22) and being located between the battery shell and the base (22).

2. The square battery shell airtightness detection device according to claim 1, characterized in that: The synchronous movement mechanism comprises a bidirectional screw (24) and two transmission sleeves (25) respectively connected to the sealing covers (26); the bidirectional screw (24) is rotatably mounted on one side of the base (22); the two transmission sleeves (25) are respectively mounted on two opposite threads of the bidirectional screw (24); the bidirectional screw (24) is adapted to be actuated to rotate, thereby driving the two sealing covers (26) to move in opposite directions or towards each other along the axis of the bidirectional screw (24); the lifting component is a cylinder (34); The two sealing covers (26) are each provided with a sealing groove (210), the bottom of the cover plate (32) is provided with a second sealing gasket (35), the second sealing gasket (35) is adapted to be inserted into the sealing groove (210) when being driven to move toward the sealing cover (26), and the two sealing grooves (210) are each provided with a first sealing gasket (29), the first sealing gasket (29) being adapted to be pressed against the top of the battery shell to form a seal when following the corresponding sealing cover (26) to move toward the battery shell; The longitudinal contraction mechanism (13) comprises a longitudinal contact block (1301) and a first spring telescopic rod (1302), one end of the first spring telescopic rod (1302) being connected to the base (22), the longitudinal contact block (1301) being connected to the other end of the first spring telescopic rod (1302), the longitudinal contact block (1301) being suitable for supporting the bottom of the battery shell, and a first air vent (1303) communicating with the outside is provided in the longitudinal contact block (1301).

3. The square battery shell airtightness detection device according to claim 2, characterized in that: The detection device further comprises a cleaning component (5), the cleaning component (5) comprising an air blower (51) and two first collecting plates (53), the two sealing covers (26) are each provided with a second air inlet (52) penetrating the two sealing covers (26), the two first collecting plates (53) respectively correspond to the two sealing covers (26), the first collecting plates (53) are connected to the corresponding sealing covers (26), the first collecting plates (53) are suitable for covering the second air inlet (52) provided on the corresponding sealing covers (26), the two first collecting plates (53) are both connected to the air blower (51) via a hose, and a water outlet trough (54) is provided in the base (22), the water outlet trough (54) is communicated with the outside.

4. The square battery shell airtightness detection device according to claim 3, characterized in that: The detection device further comprises a matching component (6), wherein the matching component (6) comprises a condenser (61), two partitions (64) corresponding to the sealing cover (26), and two second collecting plates (63) corresponding to the sealing cover (26), wherein the partitions (64) are made of glass; The two sealing covers (26) are each provided with a third air inlet (62) penetrating the sealing cover, the second collecting plate (63) is connected to the corresponding sealing cover (26) and covers the corresponding third air inlet (62), and the two second collecting plates (63) are both connected to the condenser (61) via a hose; The partition (64) is arranged in the corresponding sealing cover (26), and the partition (64) is suitable for dividing the cavity (28) into a normal temperature cavity (66) and a cold air cavity (65), the normal temperature cavity (66) is communicated with the second air inlet (52), and the cold air cavity (65) is communicated with the third air inlet (62), and a side cold air channel (68) is opened on the inner wall of the sealing cover (26) within the range of the cold air cavity (65), and the side cold air channel (68) is suitable for guiding the cold air in the cold air cavity (65) into a cavity that is not connected to the cold air cavity (65). In the remaining surface directly contacting the air cavity (65), the bottom of the partition (64) is provided with an air vent (69) penetrating the partition, and the base (22) is provided with a bottom cold air channel (67). When the sealing cover (26) is driven and contacts the base (22), the air vent (69) is communicated with the bottom cold air channel (67). The bottom cold air channel (67) is suitable for guiding the cold air in the cold air cavity (65) into the entire surface of the base (22). The bottom cold air channel (67) is not communicated with the water outlet trough (54).

5. The square battery shell airtightness detection device according to claim 1 or 4, characterized in that: Two mounting plates (36) are connected to the bottom of the base (22), and impellers (37) are rotatably mounted in the two mounting plates (36). The two impellers (37) are located at the air outlet of the first air inlet (38). The two impellers (37) are arranged in a staggered manner, and the two impellers (37) are suitable for being driven by steam discharged from the first air inlet (38) to rotate in opposite directions.

6. The square battery shell airtightness detection device according to claim 2 or 4, characterized in that: The detection device further comprises a recording component (7), wherein the recording component (7) comprises a first industrial camera (71), a second industrial camera (72), and a rotating mechanism connected to the second industrial camera (72); The rotating mechanism comprises a rotating motor (74), a driving gear (75) and a driven gear (76); the rotating motor (74) is mounted on the bracket (4); the driving gear (75) and the driven gear (76) are both rotatably mounted on the bracket (4); the driving gear (75) is connected to the rotating motor (74); the driving gear (75) is meshed with the driven gear (76); a camera adjustment frame (73) is fixedly connected to the driven gear (76); and the second industrial camera (72) is mounted on the camera adjustment frame (73); The bottom of the base (22) is connected to a protrusion, and the bottom of the protrusion is connected to a support base (21). There is a gap between the support base (21) and the base (22). The first industrial camera (71) is mounted on the support base (21). The lens of the first industrial camera (71) corresponds to the bottom surface of the base (22), thereby detecting the bottom sealing state of the battery shell.

7. The square battery case airtightness detection device according to claim 6, characterized in that: An adjustment component (8) is disposed in the base (22), and the adjustment component (8) comprises a front-to-rear adjustment mechanism (81) and a left-to-right adjustment mechanism (82); The front-to-back adjustment mechanism (81) comprises a first movable block (85) and a second movable block (812); the inner cavity of the base (22) for accommodating the battery shell comprises four surfaces, namely a first side (821), a second side (822), a third side (823) and a fourth side (824); the first movable block (85) is arranged on the first side (821); a second spring telescopic rod (88) is connected to the first movable block (85); the other end of the second spring telescopic rod (88) is connected to a front contact block (86); the front contact block (86) is suitable for contacting the battery shell; a second air vent (87) communicating with the outside is provided in the front contact block (86); The second movable block (812) is arranged on the second side (822), the first side (821) and the second side (822) are located opposite to each other, a fourth spring telescopic rod (813) is connected to the second movable block (812), the other end of the fourth spring telescopic rod (813) is connected to a rear contact block (814), the rear contact block (814) is suitable for contacting with the battery shell, and a third air vent (815) communicating with the outside is opened in the rear contact block (814); The left-right adjustment mechanism (82) comprises two fifth spring telescopic rods (817), the two fifth spring telescopic rods (817) being respectively connected to the third side (823) and the fourth side (824), the third side (823) and the fourth side (824) being located opposite to each other, and the two fifth spring telescopic rods (817) being respectively connected to side contact blocks (818), the side contact blocks (818) being suitable for contacting the battery shell.

8. The square battery case airtightness detection device according to claim 7, characterized in that: A linear motion mechanism (9) is arranged inside the workbench (1), and the linear motion mechanism (9) comprises a driving motor (91), a threaded rod (92) and a moving plate (93), wherein the driving motor (91) is mounted on the workbench (1), the threaded rod (92) is rotatably mounted inside the workbench (1), the moving plate (93) is assembled on the threaded rod (92), the moving plate (93) is connected to the support seat (21), and the driving motor (91) is connected to the threaded rod (92) so as to drive the moving plate (93) to move along the axial direction of the threaded rod (92); A loading component (10) is provided on one side of the workbench (1), and the loading component (10) is located on the workbench (1) in the same direction as the first side (821). The loading component (10) comprises a placement plate (1001) and a vertical plate (1003). The placement plate (1001) is connected to the workbench (1), and the vertical plate (1003) is connected to the placement plate (1001). The placement plate (1001) is provided with a first channel (1002), and the vertical plate (1003) is provided with a second channel (1004). ), the first channel (1002) is communicated with the second channel (1004), the first channel (1002) and the second channel (1004) are both suitable for providing a space for the first movable block (85) to pass through, the bidirectional screw (24) is fixedly connected to a gear plate (23), the workbench (1) is connected to a loading rack (1005), and when the inspection table (2) is driven to move toward the loading component (10), the loading rack (1005) is meshed with the gear plate (23) to drive the bidirectional screw (24) to rotate; The first movable block (85) is rotatably arranged relative to the first side (821); a loading inclined surface (810) is arranged on a side of the first movable block (85) close to the loading component (10); a fixed rod (83) is connected between the third side (823) and the fourth side (824); the first movable block (85) is movably sleeved on the outside of the fixed rod (83); two first contraction springs (84) are sleeved on the fixed rod (83); two ends of one of the first contraction springs (84) are respectively connected to the first movable block (85) and the third side (823); two ends of the other first contraction spring (84) are respectively connected to the first movable block (85) and the fourth side (824); and a stopper (89) is connected to the first side (821); A height limiting component (11) is arranged on the workbench (1), and the height limiting component (11) comprises a height limiting frame (1101) and a height limiting block (1102). The height limiting frame (1101) is connected to the workbench (1), and the height limiting block (1102) is connected to the height limiting frame (1101). The height limiting block (1102) is located at the center of the height limiting frame (1101). Both sides of the height limiting block (1102) are provided with guiding inclined surfaces (1103). When the detection platform (2) is driven by the linear moving mechanism (9) to move toward the loading component (10), it first passes through the height limiting component (11). An upper inclined surface (820) is provided on the top of the side contact block (818), and a front inclined surface (819) is provided on the side of the side contact block (818) close to the loading component (10).

9. The square battery case airtightness detection device according to claim 8, characterized in that: A blanking component (12) is provided on the other side of the workbench (1), the blanking component (12) being located on the workbench (1) in the direction of the same side as the second side (822), the blanking component (12) comprising a fixing plate (1201), an extrusion plate (1202) and two outer side plates (1203); The fixed plate (1201) is connected to the workbench (1), the extrusion plate (1202) and the two outer plates (1203) are both connected to the fixed plate (1201), the extrusion plate (1202) is located below the two outer plates (1203), the two outer plates (1203) are respectively connected to the two sides of the fixed plate (1201), the two outer plates (1203) are each provided with a contraction groove, a support rod (1205) is connected to the contraction groove, a contraction block (1204) is movably sleeved on the outside of the support rod (1205), a second contraction spring (1206) is sleeved on the outside of the support rod (1205), and two ends of the second contraction spring (1206) are respectively connected to the contraction block (1204) and the inner wall of the contraction groove; A third spring telescopic rod (811) is connected to the inner wall of the bottom of the base (22); the third spring telescopic rod (811) is connected to the bottom of the second movable block (812); the second movable block (812) is longitudinally movable relative to the second side (822); a blanking inclined surface (816) is provided on one side of the second movable block (812) close to the blanking component (12); The workbench (1) is connected to a material unloading rack (1207), and when the inspection platform (2) is driven to move toward the material unloading component (12), the material unloading rack (1207) meshes with the gear plate (23) to drive the bidirectional screw (24) to rotate.

10. A method for testing using the square battery case airtightness testing device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1. Place the battery shell in the base (22), so that the battery shell is located between the two sealing covers (26). Then, start the synchronous moving mechanism to drive the two sealing covers (26) to move toward each other and dock. After docking, the two sealing covers (26) form a whole and cooperate with the base (22) to wrap the battery shell inside. The top inner walls of the two sealing covers (26) abut against the top open ends of the battery shell to form a seal. Then, drive the cover plate (32) through the lifting component to the air inlet square cavity (27) formed after the two sealing covers (26) dock. The steam generator (31) is started to pass steam into the battery shell through the first air inlet (38); when there is a leak in the battery shell, the steam in the battery shell flows out from the leak into the cavity (28) and is sprayed onto the glass-made sealing cover (26) and / or the base (22) at a position corresponding to the leak, and a mist point is formed on the glass material, thereby locating the leak on the battery shell; S2. When steam is introduced into the battery shell and there is no leakage point in the battery shell, too much steam is introduced into the battery shell, causing the battery shell to move downward as a whole. While moving, the longitudinal contraction mechanism (13) is squeezed, and the overall height of the battery shell decreases, while the height of the sealing cover (26) remains unchanged. At this time, the top of the sealing cover (26) loses contact and sealing with the top of the battery shell, and all the steam in the battery shell leaks into the cavity (28), thereby preventing the battery shell from deforming.

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