A Square Battery Case Airtight Detection Device and Method

Abstract

The present invention discloses a square battery case airtightness detection device and method, wherein: The square battery case airtightness detection device includes: a workbench, a detection table placed on the workbench, an air intake assembly, and a longitudinal contraction mechanism. The detection table includes a base, a synchronous movement mechanism, and two sealing covers. The base is located above the workbench. The base and the two sealing covers are both made of glass material. The base is adapted to place the battery case. The synchronous movement mechanism is respectively connected to the two sealing covers and the base to drive the two sealing covers to move towards each other and dock to wrap the battery case. A cavity is formed between the battery case and the sealing covers and the base. After the two sealing covers are docked, an air intake square cavity is formed. The air intake square cavity communicates with the opening of the battery case. After covering the battery case with glass material, steam is introduced into the battery case. The steam jets through the air leakage point and forms fog points on the glass to accurately locate the leakage point.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection, and specifically, to an airtightness detection device and method for a square battery case. Background Art

[0002] Currently, in the field of battery manufacturing, especially in the production process of square battery cases, airtightness detection is a key link to ensure product quality and safety. A battery case with good airtightness can effectively prevent impurities such as moisture and dust from entering the battery interior, thereby avoiding faults such as battery short circuits and corrosion, and ensuring the stability and service life of the battery.

[0003] After retrieval, it is found that a Chinese patent with the publication number CN220380692U discloses an airtightness detection device for a battery case. This patent adopts a detection box, a bottom plate, and a cover plate structure. The bottom plate can be lifted and provided with positioning blocks to fix the battery case. The cover plate seals the opening of the battery case, and the airtightness is detected by submerging the battery case into the detection liquid and observing bubbles. It has the advantages of simple structure, convenient operation, and easy placement and removal of the battery case. However, this patent still uses the traditional water detection method. When the leakage point exhausts air into the water to generate continuous bubbles, it is not easy to observe the specific leakage position, and multiple leaks will cause the bubbles to be denser and more difficult to determine the leakage position. Therefore, the water detection method does not have a good leakage point positioning function. At the same time, the steam detection method is more flexible. By adding inert gas, chemical reactions with other components inside the battery case can be avoided. Also, through the setting of adding fluorescent powder, the visibility of the steam ejected from the leakage point can be further improved. At the same time, water detection will cause water to pour in from the leakage point of the battery case. Compared with steam detection, the amount of condensed water remaining inside the battery case caused by steam is less, and it is not easy to damage the components inside the battery case. And 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. By introducing steam into the battery case after covering the battery case with glass material, the steam then penetrates through the leakage point and sprays on the glass to form fog points, which can achieve accurate positioning.

[0005] To solve the above technical problem, the technical solution of the present invention is: An airtightness detection device for a square battery case, comprising:

[0006] A workbench;

[0007] A detection table placed on the workbench. The detection table includes a base, a synchronous moving mechanism, and two sealing covers. The base is located above the workbench. Both the base and the two sealing covers are made of glass. The base is suitable for placing a battery case. The synchronous moving mechanism is connected to the two sealing covers and the base respectively to drive the two sealing covers to move towards each other to dock and wrap the battery case. A cavity is formed between the battery case and the sealing covers and the base. After the two sealing covers are docked, an air inlet square cavity is formed, and the air inlet square cavity is communicated with the opening of the battery case;

[0008] An air inlet assembly. A bracket is connected to the workbench. The air inlet assembly includes a steam generator, a cover plate, an air inlet sleeve, and a lifting component connected to the bracket. A first air inlet communicating with the air inlet sleeve is opened on the cover plate. The cover plate is connected to the air inlet sleeve. The air inlet sleeve is connected to the steam generator. The lifting component is connected to the air inlet sleeve to drive the air inlet sleeve to move longitudinally, and the cover plate is driven to move and cover the air inlet square cavity, so as to introduce steam into the battery case;

[0009] A longitudinal contraction mechanism is connected to the base and is located between the battery case and the base.

[0010] Further, the synchronous moving mechanism includes a bidirectional screw and two transmission sleeves respectively connected to the sealing covers. The bidirectional screw is rotatably installed on one side of the base. The two transmission sleeves are respectively assembled on two opposite threads of the bidirectional screw. The bidirectional screw is suitable to be driven to rotate, so as to drive the two sealing covers to move in opposite or towards directions along the axis of the bidirectional screw. The lifting component is a cylinder;

[0011] Sealing grooves are opened on both of the two sealing covers. A second sealing gasket is arranged at the bottom of the cover plate. The second sealing gasket is suitable to be driven to move towards the sealing cover and insert into the sealing groove. First sealing gaskets are arranged in both of the two sealing grooves. The first sealing gasket is suitable to move towards the battery case following the corresponding sealing cover, and then squeeze with the top of the battery case to form a seal;

[0012] 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 to support the bottom of the battery case. A first air vent communicating with the outside is opened in the longitudinal contact block.

[0013] Furthermore, the airtight detection device for the square battery case further includes a cleaning component, the cleaning component includes a blower and two first collection plates, second air inlets penetrating through themselves are formed in both of the two sealing covers, the two first collection plates correspond to the two sealing covers respectively, the first collection plate is connected to the corresponding sealing cover, the first collection plate is adapted to cover the second air inlet formed in the corresponding sealing cover, both of the two first collection plates are connected to the blower through hoses, a water outlet groove is formed in the base, and the water outlet groove communicates with the outside.

[0014] Furthermore, the airtight detection device for the square battery case further includes a matching component, the matching component includes a condenser, two partitions corresponding to the sealing covers, and two second collection plates corresponding to the sealing covers, and the partitions are made of glass material;

[0015] Third air inlets penetrating through themselves are formed in both of the two sealing covers, the second collection plate is connected to the corresponding sealing cover and covers the corresponding third air inlet, and both of the two second collection plates are connected to the condenser through hoses;

[0016] The partition is arranged in the corresponding sealing cover, the partition is adapted to divide the cavity into a normal temperature cavity and a cold air cavity, the normal temperature cavity communicates with the second air inlet, the cold air cavity communicates with the third air inlet, a side cold air channel is formed in the inner wall of the sealing cover within the range of the cold air cavity, and the side cold air channel is adapted to introduce the cold air in the cold air cavity into the other surfaces that are not in direct contact with the cold air cavity. A vent hole penetrating through itself is formed at the bottom of the partition, a bottom cold air channel is formed in the base, when the sealing cover is driven to contact the base, the vent hole communicates with the bottom cold air channel, the bottom cold air channel is adapted to introduce the cold air in the cold air cavity into all surfaces of the base, and the bottom cold air channel does not communicate with the water outlet groove.

[0017] Furthermore, two mounting plates are connected to the bottom of the cover plate, impellers are rotatably mounted in both of the two mounting plates, both of the two impellers are located at the air outlet of the first air inlet, the two impellers are arranged in a staggered manner, and the two impellers are adapted to be driven by the steam discharged from the first air inlet to rotate in opposite directions to each other.

[0018] Furthermore, the airtight detection device for the square battery case further includes a recording component, the recording component includes a first industrial camera, a second industrial camera, and a rotating mechanism connected to the second industrial camera;

[0019] The rotating mechanism includes a rotating motor, a driving gear, and a driven gear. The rotating motor is installed on the bracket. The driving gear and the driven gear are both rotatably installed on the bracket. The driving gear is connected to the rotating motor, and the driving gear meshes with the driven gear. A camera adjusting bracket is fixedly connected to the driven gear, and the second industrial camera is installed on the camera adjusting bracket;

[0020] A convex block is connected to the bottom of the base. A support seat is connected to the bottom of the convex block. There is a gap between the support seat and the base. The first industrial camera is installed on the support seat, and the lens of the first industrial camera corresponds to the bottom surface of the base to detect the bottom sealing state of the battery case.

[0021] Furthermore, an adjusting assembly is arranged in the base. The adjusting assembly includes a front-back adjusting mechanism and a left-right adjusting mechanism;

[0022] The front-back adjusting mechanism includes a first movable block and a second movable block. The inner cavity of the base for accommodating the battery case has 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, and the other end of the second spring telescopic rod is connected to a front contact block. The front contact block is adapted to contact the battery case, and a second air vent communicating with the outside is opened in the front contact block;

[0023] The second movable block is arranged on the second side. The first side and the second side are opposite in position. A fourth spring telescopic rod is connected to the second movable block, and the other end of the fourth spring telescopic rod is connected to a rear contact block. The rear contact block is adapted to contact the battery case, and a third air vent communicating with the outside is opened in the rear contact block;

[0024] The left-right adjusting mechanism includes two fifth spring telescopic rods. The two fifth spring telescopic rods are respectively connected to the third side and the fourth side. The third side and the fourth side are opposite in position. Side contact blocks are respectively connected to the two fifth spring telescopic rods. The side contact blocks are adapted to contact the battery case.

[0025] Furthermore, a linear movement mechanism is arranged in the workbench. The linear movement mechanism includes a driving motor, a threaded rod, and a moving plate. The driving motor is installed on the workbench. The threaded rod is rotatably installed in the workbench. The moving plate is assembled on the threaded rod. The moving plate is connected to the support seat. The driving motor is connected to the threaded rod to drive the moving plate to move along the axis direction of the threaded rod;

[0026] On one side of the workbench, a feeding component is provided. The feeding component is located in the direction on the same side of the workbench as the first side. The feeding component includes a placing plate and a vertical plate. The placing plate is connected to the workbench, and the vertical plate is connected to the placing plate. A first channel is formed in the placing plate, and a second channel is formed in the vertical plate. The first channel communicates with the second channel. Both the first channel and the second channel are adapted to provide a space for the first movable block to pass through. A gear disc is fixedly connected to the bidirectional screw, and a feeding rack is connected to the workbench. When the inspection table is driven to move towards the feeding component, the feeding rack meshes with the gear disc to drive the bidirectional screw to rotate;

[0027] The first movable block is rotatably arranged relative to the first side. A feeding inclined surface is arranged on one side of the first movable block close to the feeding component. A fixing rod is connected between the third side and the fourth side. The first movable block is movably sleeved outside the fixing rod. Two first compression springs are sleeved on the fixing rod. Two ends of one of the first compression springs are respectively connected to the first movable block and the third side, and two ends of the other first compression spring are respectively connected to the first movable block and the fourth side. A stop block is connected to the first side;

[0028] A height limiting component is arranged on the workbench. 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 central position of the height limiting frame. Guide inclined surfaces are arranged on both sides of the height limiting block. When the inspection table is driven by the linear moving mechanism to move towards the feeding component, it first passes through the height limiting component. An upper inclined surface is formed at the top of the side contact block, and a front inclined surface is formed on one side of the side contact block close to the feeding component.

[0029] Further, a discharging component is arranged on the other side of the workbench. The discharging component is located in the direction on the same side of the workbench as the second side. The discharging component includes a fixing plate, a pressing plate and two outer side plates;

[0030] The fixing plate is connected to the workbench, the pressing plate and the two outer side plates are both connected to the fixing plate. The pressing plate is located below the two outer side plates. The two outer side plates are respectively connected to both sides of the fixing plate. A contraction groove is formed in each of the two outer side plates. A support rod is connected in the contraction groove. A contraction block is movably sleeved outside the support rod. A second compression spring is sleeved on the support rod. Two ends of the second compression spring are respectively connected to the contraction block and the inner wall of the contraction groove;

[0031] 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. A blanking inclined surface is arranged on one side of the second movable block close to the blanking component.

[0032] A blanking rack is connected to the workbench. When the inspection table is driven to move towards the blanking component, the blanking rack meshes with the gear disc to drive the bidirectional screw to rotate.

[0033] The present invention also discloses a method for detecting by using a square battery case airtight detection device. The method includes the following steps:

[0034] S1. Place the battery case in the base. At this time, the battery case is located between the two sealing covers. Then start the synchronous moving mechanism to drive the two sealing covers to move towards each other and dock. After docking, the two sealing covers form a whole and cooperate with the base to wrap the battery case inside. The inner walls of the tops of the two sealing covers abut against the top opening end of the battery case to form a seal. Then drive the cover plate to move towards the air inlet cavity formed after the docking of the two sealing covers through the lifting component until the cover plate abuts against the tops of the two sealing covers and forms a seal. Finally, start the steam generator to introduce steam into the battery case through the first air inlet. When there is a leakage point in the battery case, the steam in the battery case gushes out from the leakage point into the cavity and sprays to the position on the glass material of the sealing cover and / or the base corresponding to the leakage point, and at the same time, a fog point is formed on the glass material to locate the leakage point on the battery case.

[0035] S2. When there is no leakage point in the battery case after the steam is introduced into the battery case, during the process that the steam introduced into the battery case causes the whole battery case to move downward, the battery case squeezes the longitudinal contraction mechanism, the overall height of the battery case decreases, while the height of the sealing cover remains unchanged. At this time, the top of the sealing cover loses contact and seal with the top of the battery case, and all the steam in the battery case leaks into the cavity to avoid the deformation of the battery case.

[0036] Adopting the above technical solutions, the present invention has the following beneficial effects:

[0037] 1. Through the settings of structures such as the sealing cover and the steam generator, after the two sealing covers are moved and docked, the base used to place the battery case can comprehensively cover the entire battery case. The top of the sealing cover exerts pressure on the top of the battery case, and the longitudinal contraction mechanism at the bottom of the battery case generates a reaction force, thereby realizing the sealing setting between the sealing cover and the battery case. At the same time, the longitudinal contraction mechanism also improves the adaptability to battery cases of different heights. After sealing, steam is introduced into the interior of the battery case from the intake air cavity through the steam generator. The steam leakage points on the battery case spray the steam onto the glass sealing cover and / or the base, which can be directly observed. By comparing the marks of the fog residue on the glass with the battery case, the position of the steam leakage point of the battery case can be obtained. When the battery case is sealed properly, the continuous pressurization of the steam will squeeze the longitudinal contraction mechanism, resulting in the overall downward movement of the battery case, thereby realizing automatic pressure relief and avoiding damage to the battery case itself.

[0038] 2. Through the settings of structures such as the blower and the condenser, a partition is arranged inside the sealing cover, dividing the cavity formed between the sealing cover and the battery case into two areas. When the battery case leaks, the steam directly sprays onto the glass partition to generate fog residue, thereby positioning the leakage point. When the fog residue is not obvious, the condenser cools the entire sealing cover and the partition. After cooling, the fog residue is more obvious. When the detection is completed, the blower blows out dry gas to remove the generated fog residue points, and at the same time avoids excessive generation of condensed water.

[0039] 3. Through the settings of structures such as the first industrial camera and the second industrial camera, the first industrial camera and the second industrial camera respectively photograph the battery case from the bottom and the side, realizing the recording and positioning of leakage points in all directions. The rotating mechanism drives the second industrial camera to take pictures at multiple angles to ensure detection without dead angles. The image data is transmitted to the control system in real time, supporting automated analysis and report generation, and improving the detection efficiency and data traceability.

[0040] 4. Through the settings of structures such as the front-back adjustment mechanism and the left-right adjustment mechanism, the front-back adjustment mechanism and the left-right adjustment mechanism are adaptively adjusted through the spring telescopic rod and the contact block, compatible with battery cases of different sizes and shapes, so that battery cases of different sizes are always located at the center of the base, facilitating subsequent steam to quickly cover the entire interior of the battery case. The second ventilation hole and the third ventilation hole ensure the air pressure balance between the battery case and the outside world, avoiding detection errors, and at the same time reducing the detection dead angles caused by positioning the battery case.

[0041] 5. Through the settings of structures such as the feeding component, height-limiting component, and discharging component, driven by the driving motor and the threaded rod, the entire inspection table can move on the workbench. During the movement, the sealing cover can be automatically opened and closed. When moving towards the feeding component, it can automatically receive materials, and then the height-limiting component presses battery cases of different heights to a unified height, facilitating the subsequent wrapping of the entire battery case by the sealing cover for airtight detection. After the detection is completed, it continues to move towards the discharging component for automatic discharging processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the overall structure of the present invention Figure 1 ;

[0043] Figure 2 Schematic diagram of the overall structure of the present invention Figure 2 ;

[0044] Figure 3 Schematic diagram of the inspection table and the air intake assembly of the present invention;

[0045] Figure 4 Schematic diagram of the overall inspection table of the present invention Figure 1 ;

[0046] Figure 5 Schematic diagram of the overall inspection table of the present invention Figure 2 ;

[0047] Figure 6 External schematic diagram of the sealing cover after docking of the present invention;

[0048] Figure 7 Internal schematic diagram of the sealing cover after docking of the present invention;

[0049] Figure 8 Of the present invention Figure 7 Enlarged view of part A;

[0050] Figure 9 Schematic diagram of the structure of the sealing cover of the present invention Figure 1 ;

[0051] Figure 10 Cross-sectional view of the sealing cover of the present invention;

[0052] Figure 11 Schematic diagram of the structure of the sealing cover of the present invention Figure 2 ;

[0053] Figure 12 Schematic diagram of the structure of the recording component of the present invention;

[0054] Figure 13 Of the present invention Figure 12 Enlarged view of part B;

[0055] Figure 14 Schematic diagram of the base structure of the present invention Figure 1 ;

[0056] Figure 15 Of the present invention Figure 14 Enlarged view at position C in

[0057] Figure 16 Schematic diagram of the base structure of the present invention Figure 2 ;

[0058] Figure 17 Of the present invention Figure 16 Enlarged view at position D in

[0059] Figure 18 Of the present invention Figure 16 Enlarged view at position E in

[0060] Figure 19 Schematic diagram of the layout structure of the workbench of the present invention;

[0061] Figure 20 Schematic diagram of the structure of the feeding component of the present invention;

[0062] Figure 21 Schematic diagram of the structure of the height-limiting component of the present invention;

[0063] Figure 22 Schematic diagram of the structure of the discharging component of the present invention;

[0064] Figure 23 Schematic diagram of the structure for rotating the shrinkage block of the present invention.

[0065] In the figure: 1, workbench; 2, inspection table; 21, support base; 22, base; 23, gear disc; 24, bidirectional screw; 25, transmission sleeve; 26, seal cover; 27, air inlet square cavity; 28, cavity; 29, first gasket; 210, seal groove;

[0066] 3, air inlet assembly; 31, steam generator; 32, cover plate; 33, air inlet sleeve; 34, cylinder; 35, second gasket; 36, mounting plate; 37, impeller; 38, first air inlet;

[0067] 4, bracket; 5, cleaning assembly; 51, blower; 52, second air inlet; 53, first collection plate; 54, water outlet trough; 6, matching assembly; 61, condenser; 62, third air inlet; 63, second collection plate; 64, partition board; 65, cold air cavity; 66, normal temperature cavity; 67, bottom cold air channel; 68, side cold air channel; 69, air release port;

[0068] 7. Recording component; 71. First industrial camera; 72. Second industrial camera; 73. Camera adjusting frame; 74. Rotating motor; 75. Driving gear; 76. Driven gear;

[0069] 13. Longitudinal contraction mechanism; 1301. Longitudinal contact block; 1302. First spring telescopic rod; 1303. First ventilation hole;

[0070] 8. Adjusting component; 81. Front - rear adjusting mechanism; 82. Left - right adjusting mechanism; 83. Fixed rod; 84. First contraction spring; 85. First movable block; 86. Front contact block; 87. Second ventilation 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 ventilation 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;

[0071] 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 inclined plane; 12. Unloading component; 1201. Fixed plate; 1202. Extrusion plate; 1203. Outer plate; 1204. Shrinkage block; 1205. Support rod; 1206. Second contraction spring; 1207. Unloading rack. Detailed implementation mode

[0072] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.

[0073] Embodiment 1: As Figures 1-6 shown, a square battery case airtight detection device includes:

[0074] Workbench 1;

[0075] The inspection table 2 placed on the workbench 1, the inspection table 2 includes a base 22, a synchronous moving mechanism and two sealing covers 26. The base 22 is located above the workbench 1. Both the base 22 and the two sealing covers 26 are made of glass. A battery case is suitable to be placed inside the base 22. 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 towards each other and dock to wrap the battery case. A cavity 28 is formed between the battery case and the sealing covers 26 and the base 22. After the two sealing covers 26 are docked, an air inlet square cavity 27 is formed. The air inlet square cavity 27 communicates with the opening of the battery case;

[0076] The air inlet assembly 3. A bracket 4 is connected to the workbench 1. The air inlet assembly 3 includes a steam generator 31, a cover plate 32, an air inlet sleeve 33 and a lifting component connected to the bracket 4. A first air inlet 38 communicating with the air inlet sleeve 33 is opened on the cover plate 32. The cover plate 32 is connected to the air inlet sleeve 33. The air inlet sleeve 33 is connected to the steam generator 31. The lifting component is connected to the air inlet sleeve 33 to drive the air inlet sleeve 33 to move longitudinally. The cover plate 32 is suitable to be driven to move and cover the air inlet square cavity 27, and then steam is introduced into the battery case;

[0077] The longitudinal contraction mechanism 13 is connected to the base 22 and is located between the battery case and the base 22.

[0078] Such as Figures 4-6 、 Figures 11-13 、 Figure 15 As shown, the synchronous moving mechanism includes a bidirectional screw 24 and two transmission sleeves 25 respectively connected to the sealing covers 26. The bidirectional screw 24 is rotatably installed 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 to be actuated to rotate, and then drive the two sealing covers 26 to move in opposite or towards each other directions along the axis of the bidirectional screw 24. The lifting component is a cylinder 34;

[0079] Sealing grooves 210 are opened on both of the two sealing covers 26. A second sealing gasket 35 is arranged at the bottom of the cover plate 32. The second sealing gasket 35 is suitable to be driven to move towards the sealing cover 26 and insert into the sealing groove 210. First sealing gaskets 29 are arranged in both of the two sealing grooves 210. The first sealing gaskets 29 are suitable to be driven to move towards the battery case along with the corresponding sealing covers 26 and squeeze against the top of the battery case to form a seal;

[0080] 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. 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 to support the bottom of the battery case. A first ventilation hole 1303 communicating with the outside is opened in the longitudinal contact block 1301.

[0081] Such asFigures 1-2 , Figures 7-11 As shown in Figures 7-11 , the detection device further includes a cleaning assembly 5. The cleaning assembly 5 includes a blower 51 and two first collection plates 53. Second air inlets 52 penetrating through themselves are formed in both of the two sealing covers 26. The two first collection plates 53 correspond to the two sealing covers 26 respectively. The first collection plate 53 is connected to the corresponding sealing cover 26 and is adapted to cover the second air inlet 52 formed in the corresponding sealing cover 26. The two first collection plates 53 are both connected to the blower 51 through hoses. A water outlet groove 54 is formed in the base 22, and the water outlet groove 54 communicates with the outside.

[0082] As Figures 1-2 , Figures 7-11 shown in Figures 7-11 , the detection device further includes a cooperation assembly 6. The cooperation assembly 6 includes a condenser 61, two partition plates 64 corresponding to the sealing covers 26, and two second collection plates 63 corresponding to the sealing covers 26. The partition plate 64 is made of glass material;

[0083] Third air inlets 62 penetrating through themselves are formed in both of the two sealing covers 26. The second collection plate 63 is connected to the corresponding sealing cover 26 and covers the corresponding third air inlet 62. The two second collection plates 63 are both connected to the condenser 61 through hoses;

[0084] The partition plate 64 is arranged in the corresponding sealing cover 26 and is adapted to divide the cavity 28 into a normal temperature cavity 66 and a cold air cavity 65. The normal temperature cavity 66 communicates with the second air inlet 52, and the cold air cavity 65 communicates with the third air inlet 62. Side cold air channels 68 are formed in the inner wall of the sealing cover 26 within the range of the cold air cavity 65. The side cold air channels 68 are adapted to introduce the cold air in the cold air cavity 65 into the remaining surfaces that are not in direct contact with the cold air cavity 65. An air leakage port 69 penetrating through itself is formed at the bottom of the partition plate 64. A bottom cold air channel 67 is formed in the base 22. When the sealing cover 26 is driven to contact the base 22, the air leakage port 69 communicates with the bottom cold air channel 67. The bottom cold air channel 67 is adapted to introduce the cold air in the cold air cavity 65 into all surfaces of the base 22, and the bottom cold air channel 67 does not communicate with the water outlet groove 54.

[0085] As Figure 13 shown in Figure 13 , two mounting plates 36 are connected to the bottom of the cover plate 32. Impellers 37 are rotatably mounted in both of 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 staggeredly, and the two impellers 37 are adapted to be driven by the steam discharged from the first air inlet 38 to rotate in opposite directions to each other.

[0086] As Figure 12 shown in Figure 12 , the detection device further includes a recording assembly 7. The recording assembly 7 includes a first industrial camera 71, a second industrial camera 72, and a rotating mechanism connected to the second industrial camera 72;

[0087] The rotating mechanism includes a rotating motor 74, a driving gear 75 and a driven gear 76. The rotating motor 74 is installed on the bracket 4. The driving gear 75 and the driven gear 76 are both rotatably installed on the bracket 4. The driving gear 75 is connected to the rotating motor 74. The driving gear 75 meshes with the driven gear 76. A camera adjusting frame 73 is fixedly connected to the driven gear 76. The second industrial camera 72 is installed on the camera adjusting frame 73;

[0088] A convex block is connected to the bottom of the base 22. A support base 21 is connected to the bottom of the convex block. 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, so as to detect the bottom sealing state of the battery case.

[0089] The working principle of this embodiment is as follows:

[0090] During 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 directly place the battery case inside the base 22 with the opening of the battery case facing upward. Since the bottom of the battery case is directly placed on the base 22, it will cause the bottom surface to be unable to perform a good airtightness test. Therefore, a longitudinal contraction mechanism 13 is provided inside the base 22, and the battery case is placed on the 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 the height change of the battery case. A first air vent 1303 is opened in the longitudinal contraction block 1204. This setting can avoid detection dead corners in the part of the longitudinal contraction block 1204 that contacts the battery case. When there is an air leakage phenomenon in the contact part, the steam can also escape through the first air vent 1303 and be observed. This step is the placement work of the battery case;

[0091] After the battery case is placed, the bidirectional screw 24 needs to be rotated to drive two drive sleeves 25 assembled on the bidirectional screw 24 to move towards each other. The drive sleeve 25 and the bidirectional screw 24 can be assembled through a ball nut. The specific working principle of the bidirectional screw 24 driving two components to move towards or away from each other is prior art and will not be elaborated in detail here. When the two drive sleeves 25 are driven to move towards each other, the two sealing covers 26 can be moved towards each other, thus 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 case. The battery case under extrusion moves downward, squeezing the first spring telescopic rod 1302. The first spring telescopic rod 1302 generates a reaction force, forming a tight sealing effect between the battery case and the first sealing gasket 29. It should be noted that due to the large or small size differences of different battery cases or the same battery case, when the first sealing gasket 29 in the sealing cover 26 is about to contact the battery case, the battery case can be manually pressed or pressed by other electrically controlled pressure-generating means in advance to press the height of the battery case below the height of the first sealing gasket 29, so as to avoid the interference of the battery case's own height problem on the docking movement of the sealing cover 26. After the sealing cover 26 completes docking, the two sealing covers 26 and the base 22 can form a complete seal for the battery case except at the opening. It should be noted that the sealing cover 26 and the base 22 can also be sealed, but there are no strict sealing requirements. After the two sealing covers 26 are docked, an air inlet square cavity 27 is formed. The air inlet square cavity 27 can unify the open ends of battery cases of different sizes. At the same time, a cavity 28 is formed between the sealing cover 26 and the base 22 and the battery case. This step completes the preparatory work before the airtightness test;

[0092] After the docking of the sealing cover 26 is completed, the detection work officially begins. First, start the air cylinder 34 to drive the cover plate 32 and the intake sleeve 33 as a whole to move towards the battery case. Since the height adaptive adjustment settings of battery cases of different sizes have been made in advance and are covered by the sealing cover 26 with a constant height, the height at which the air cylinder 34 drives the cover plate 32 to descend is fixed and not affected by battery cases of different sizes. The cover plate 32 only needs to descend until it contacts the two sealing covers 26. At this time, the cover plate 32 completely covers the intake cavity 27, and the second sealing gasket 35 on the cover plate 32 is inserted into the sealing grooves 210 opened on the two sealing covers 26, thus completing the sealing between the cover plate 32 and the sealing cover 26. After the sealing, start the steam generator 31 and pre-adjust the temperature of the steam generator 31 so that it will not cause damage to the battery case. After the steam generator 31 is started, the steam is introduced into the interior of the battery case through the first intake port 38 on the cover plate 32. When the steam in the battery case is continuously pressurized, if there is a leak point in the battery case, the steam inside the battery case will pour into the cavity 28 through the leak point. And because the leak point is very small, the emerging steam will spray on the base 22 and / or the sealing cover 26 in an almost straight line. Since both the base 22 and the sealing cover 26 are made of glass, the spraying of the steam will leave a residue of fog on them. The residue point of the fog corresponds to the leak point on the battery case. By observing and recording, the position of the leak point on the battery case with a relatively high accuracy can be obtained. At the same time, the first vent hole 1303 can guide the steam leaked from the part of the battery case in contact with the longitudinal contact block 1301 to the glass, reducing dead angles;

[0093] When there is no air leakage in the battery case (i.e., the airtightness is intact), at this time, since the steam inside the battery case is still continuously pressurized and there is no pressure relief treatment for the leak point, when the pressure reaches a certain level, the whole battery case will be pushed downward by the pressure of the steam, and then the battery case will further squeeze the first spring telescopic rod 1302. At this time, the further downward movement of the battery case inside the sealing cover 26 will cause the seal between the battery case and the first sealing gasket 29 to fail. At this time, the steam accumulated in the battery case will complete the pressure relief by pouring into the cavity 28. After this phenomenon is observed, the detection can be stopped and it is regarded as qualified airtightness. 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 case cannot be accurately pressed down by the steam pressure, it can also be judged by time. When there is no residue point of fog on the glass after a certain time, the detection can also be stopped and it is regarded as qualified airtightness;

[0094] In addition, since the detection of air leakage during each steam detection work will cause fog residues on the glass, and the untimely treatment of fog residues will affect the next detection and the residues of condensed water. Therefore, a second air inlet 52 is provided on the sealing cover 26. By starting the blower 51, dry gas is introduced into the first collecting plate 53 through a hose. The dry gas located in the first collecting plate 53 blows on all the inner walls of the sealing cover 26 through the second air inlet 52, wiping off the fog residues and reducing the possibility of generating condensed water. When the two sealing covers 26 are still in the docking state, the dry gas introduced through the second air inlet 52 can directly act on the base 22 to correspondingly treat the fog residues remaining on the base 22. 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 the gas, and then the condensed water is discharged from the inside of the base 22 through the water outlet groove 54 under continuous blowing. This step can avoid the adverse impact of a single detection on subsequent detections;

[0095] In addition, since the detection of steam relies on the generation of the fogging point, and the generation of the fogging point in turn depends on the temperature difference, when the temperature of the steam sprayed on the glass is almost the same as the temperature of the glass itself, even if the fogging point can be generated, it will be extremely difficult to observe. Therefore, this problem is solved by adding a partition 64 made of glass material in the sealing cover 26. At this time, the steam sprayed out is changed from being sprayed on the sealing cover 26 originally to being sprayed on the partition 64. Correspondingly, the dry gas blown out through the second air inlet 52 also acts on the partition 64 and the base 22 at this time. The area between the partition 64 and the battery case is a normal temperature chamber 66, and the area between the partition 64 and the sealing cover 26 is a cold air chamber 65. Start the condenser 61 and introduce cold air 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 several surfaces of the sealing cover 26 through the side cold air channels 68, so as to realize the cold air for the entire sealing cover 26 and the partition 64. At this time, when the steam is sprayed on the partition 64 again, clear visible fogging point residues will be left. At the same time, since the two sealing covers 26 are in a butted 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. The air vent 69 opened at the bottom of the partition 64 is connected to the bottom cold air channel 67 opened on the base 22, so as to introduce the cold air in the cold air chamber 65 into the entire base 22, reducing the temperature of the base 22. When there is an air leakage point at the bottom of the battery case, 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 groove 54. At the same time, since the sealing requirements between the sealing cover 26 and the base 22 are not strict, there may be a problem of cold air leakage. However, slight leakage will not overly affect the cooling treatment of the sealing cover 26 and the base 22. If the influence is large, the sealing treatment after the direct contact between the sealing cover 26 and the base 22 can be strengthened;

[0096] It should be noted that since both the sealing cover 26 and the base 22 are made of glass materials, but other components are connected to their exteriors. However, since the combination of the base 22 and the sealing cover 26 is suitable for wrapping the entire battery case, the sizes of the base 22 and the sealing cover 26 are much larger than the sizes of various battery cases of different specifications. Therefore, even if various components are connected to the sealing cover 26 and the base 22, it can be avoided that the fogging points generated by the air leakage points are seriously blocked. Slight blocking can still judge the corresponding positions of the fogging points and the air leakage points. The sealing cover 26 is set to be opened 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 at the same time, the overall height of the device is reduced. As for the components connected to the sealing cover 26 and the base 22, they can be connected by means of adhesion, nesting through holes in the glass or bolts. This part belongs to the prior art and will not be described in detail here. As long as they can be connected, and at the same timeFigure 1 and Figure 2 The position of the sealing cover 26 in Figure 2 should be in the closed state. It is unfolded for easy display, but actually it should be in Figure 6 the state shown;

[0097] The above observation of the fogging point mainly adopts the manual recognition method. This method is not comprehensive enough in capturing information and does not have traceability. 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 usage requirements, as long as they can ensure normal photographing, video recording, storage, and wireless transmission functions. A polarization filter should be used to eliminate the interference of glass reflection. The first industrial camera 71 is installed on the support base 21, and its lens is aligned with the bottom of the base 22, mainly used to monitor whether there is air leakage at the bottom of the battery case and the position of the air leakage point. The second industrial camera 72 is driven by a rotating mechanism to rotate 360° around the entire detection table 2. With the cooperation of the two industrial cameras, the detected state can be recorded and stored without dead angles, and corresponding processing can be performed on the battery cases with unqualified airtightness subsequently. 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 adjusting frame 73 connected to it to rotate, and the second industrial camera 72 is installed on the camera adjusting 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. When the second industrial camera 72 rotates and records, it does not interfere with the output hoses of the blower 51 and the condenser 61. 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 limit plates to reduce interference with the rotating second industrial camera 72;

[0098] When steam enters the battery case through the first air inlet 38 on the cover plate 32, the continuously flowing air drives the two impellers 37 arranged at the bottom of the cover plate 32 to rotate. The positions of the two impellers 37 are arranged crosswise, and the two impellers 37 rotate in opposite directions under the drive of the air flow. The two impellers 37 rotating in opposite directions drive the steam to form a vortex inside the battery case. The generation of the vortex can accelerate the steam to pass through the position with the air leakage point, thereby improving the efficiency of the entire airtightness detection.

[0099] Embodiment 2: As Figures 14-18 shown, this embodiment further includes the following structure on the basis of Embodiment 1: An adjustment assembly 8 is arranged inside the base 22, and the adjustment assembly 8 includes a front-back adjustment mechanism 81 and a left-right adjustment mechanism 82;

[0100] The front-back adjustment mechanism 81 includes a first movable block 85 and a second movable block 812. The inner cavity of the base 22 for accommodating the battery case includes 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 adapted to contact the battery case. A second ventilation hole 87 communicating with the outside is formed in the front contact block 86;

[0101] The second movable block 812 is arranged on the second side 822. The first side 821 and the second side 822 are opposite in position. 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 adapted to contact the battery case. A third ventilation hole 815 communicating with the outside is formed in the rear contact block 814;

[0102] The left-right adjustment mechanism 82 includes two fifth spring telescopic rods 817. The two fifth spring telescopic rods 817 are respectively connected to the third side 823 and the fourth side 824. The third side 823 and the fourth side 824 are opposite in position. Side contact blocks 818 are respectively connected to the two fifth spring telescopic rods 817. The side contact blocks 818 are adapted to contact the battery case.

[0103] The working principle of this embodiment is as follows:

[0104] An adjustment assembly 8 composed of a front-back adjustment mechanism 81 and a left-right adjustment mechanism 82 is arranged in the base 22. Its purpose is to quickly fix battery cases of various different sizes at the central position of the base 22. When the battery case is centered, steam uniformly diffuses from the intake square cavity 27 to all inner walls, avoiding the phenomenon of uneven local steam pressure caused by offset, ensuring that tiny leakage points (such as welds and bends) can be effectively detected. The shooting benchmarks of the first industrial camera 71 and the second industrial camera 72 take the center of the base 22 as the origin. Centered fixation can avoid the phenomenon of image distortion or coordinate mapping error caused by the offset of the battery case, and the positioning accuracy is more stable. When the two sealing covers 26 are closed, the second sealing gasket 35 thereof needs to be precisely aligned with the top of the battery case. Centered fixation ensures uniform pressure on the sealing contact surface and avoids local air leakage caused by skew. For this part, the size of the second sealing gasket 35 should be larger than the largest-sized battery case to be detected;

[0105] 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 rear contact block 814 squeezes the spring telescopic rod connected to it to offset the position until the battery case can be placed entirely between the four contact blocks. Then, the bottom surface of the battery case is brought into contact with the longitudinal contact block 1301. After placing the battery case, 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, reset simultaneously and squeeze the battery case in the middle. The four spring telescopic rods will adjust themselves to make the forces received by the four spring telescopic rods the same. At this time, the battery case is automatically positioned at the center of the base 22;

[0106] 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 longitudinal contact block 1301 at the bottom that come into contact with the battery case to prevent damage to the surface of the battery case. The elastic material can be rubber, etc. At the same time, a second ventilation hole 87 is provided in the front contact block 86, and a third ventilation hole 815 is provided in the rear contact block 814. The functions of these two ventilation holes are the same as those of the first ventilation hole 1303, which is to avoid the problem of detection dead angles caused by their own contact and support with the battery case, so that the steam ejected from the air leakage points existing on the part of the battery case in contact with them can be discharged through the corresponding ventilation holes and sprayed onto the glass again.

[0107] Embodiment 3: As Figures 19-21 、 Figures 14-15 、 Figure 18 shown, this embodiment further includes the following structure on the basis of Embodiment 1: A linear movement mechanism 9 is provided in the workbench 1. The linear movement 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, the threaded rod 92 is rotatably installed in 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 to drive the moving plate 93 to move along the axis of the threaded rod 92. It should be noted that when the detection table moves, the air blower 51 and the condenser 61 connected to it are stationary. Therefore, relatively long hoses should be used for connection. During the movement of the detection table, the hoses move in the hollow part of the workbench to ensure that the movement of the detection table will not cause the disconnection of the air blower 51 and the condenser 61 from the detection table;

[0108] On one side of the workbench 1, a feeding component 10 is provided. The feeding component 10 is located in the direction on the workbench 1 that is on the same side as the first side 821. The feeding component 10 includes 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. A first channel 1002 is formed on the placement plate 1001, and a second channel 1004 is formed on the vertical plate 1003. The first channel 1002 communicates with the second channel 1004. Both the first channel 1002 and the second channel 1004 are adapted to provide a space for the first movable block 85 to pass through. A gear disk 23 is fixedly connected to the bidirectional screw 24, and a feeding rack 1005 is connected to the workbench 1. When the inspection table 2 is driven to move towards the feeding component 10, the feeding rack 1005 meshes with the gear disk 23 to drive the bidirectional screw 24 to rotate;

[0109] The first movable block 85 is rotatably arranged relative to the first side 821. On the side of the first movable block 85 close to the feeding component 10, a feeding inclined surface 810 is provided. A fixing rod 83 is connected between the third side 823 and the fourth side 824. The first movable block 85 is movably sleeved outside the fixing rod 83. Two first compression springs 84 are sleeved on the fixing rod 83. One end of one first compression spring 84 is respectively connected to the first movable block 85 and the third side 823, and the two ends of the other first compression spring 84 are respectively connected to the first movable block 85 and the fourth side 824. A stop block 89 is connected to the first side 821;

[0110] A height limiting component 11 is provided on the workbench 1. 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 central position of the height limiting frame 1101. Guide inclined surfaces 1103 are provided on both sides of the height limiting block 1102. When the inspection table 2 is driven by the linear movement mechanism 9 to move towards the feeding component 10, it first passes through the height limiting component 11. An upper inclined surface 820 is formed at the top of the side contact block 818, and a front inclined surface 819 is formed on the side of the side contact block 818 close to the feeding component 10.

[0111] As Figures 22-23 、 Figures 16-17 As shown in the figure, on the other side of the workbench 1, a discharging component 12 is provided. The discharging component 12 is located in the direction on the workbench 1 that is on the same side as the second side 822. The discharging component 12 includes a fixing plate 1201, a pressing plate 1202, and two outer side plates 1203;

[0112] 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, and the two outer plates 1203 are respectively connected to both sides of the fixed plate 1201. Shrinkage grooves are formed in both of the two outer plates 1203, a support rod 1205 is connected in the shrinkage groove, a shrinkage block 1204 is movably sleeved outside the support rod 1205, a second shrinkage spring 1206 is sleeved outside the support rod 1205, and both ends of the second shrinkage spring 1206 are respectively connected to the shrinkage block 1204 and the inner wall of the shrinkage groove;

[0113] A third spring telescopic rod 811 is connected to the bottom inner wall 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, and a blanking inclined surface 816 is arranged on one side of the second movable block 812 close to the blanking component 12;

[0114] A blanking rack 1207 is connected to the workbench 1. When the inspection table 2 is driven to move towards the blanking component 12, the blanking rack 1207 meshes with the gear disc 23 to drive the bidirectional screw rod 24 to rotate.

[0115] The working principle of this embodiment is as follows:

[0116] To improve the automation degree of the overall operation of the equipment, a feeding component 10, a height limiting component 11 and a blanking component 12 are provided to automate the entire working process. The specific working process is as follows: The inspection table 2 is initially located near the feeding component 10 and continues to move towards the feeding component 10 through the linear moving mechanism 9. Automatic feeding is completed during the movement, and then it moves towards the cover plate 32. During the movement, it passes through the height limiting component 11 to perform height limiting processing on battery cases with different heights. After the height limiting processing, the sealing cover 26 is automatically closed to wrap the battery case. After wrapping, the inspection table 2 comes below the cover plate 32. The cover plate 32 is docked with the sealing cover 26 through the cylinder 34 and starts inspection. After inspection, it is recorded by two industrial cameras. After the recording is completed, the cover plate 32 is disconnected from the sealing cover 26. The entire inspection table 2 continues to move towards the blanking component 12. During the movement, the sealing cover 26 is automatically opened, and finally automatic blanking is completed under the action of the blanking component 12. After blanking is completed, it continues to move towards the feeding component 10, and the automation inspection is realized in a cycle. The entire working process can be controlled by a PLC;

[0117] The linear movement mechanism 9 drives the threaded rod 92 to rotate by starting the drive 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 prior art and will not be elaborated in detail here. The moving plate 93 is connected to the support base 21, thereby driving the entire detection table 2 to move linearly along the axis direction of the threaded rod 92. The moving direction of the detection table 2 is changed by controlling the forward and reverse rotation of the drive motor 91;

[0118] When automatic feeding is required, the inspection table 2 in the open state of the sealing cover 26 moves towards the placing plate 1001. The placing plate 1001 is used to pre-place the battery cases to be inspected. The bottom of the battery case is placed on the placing plate 1001, and the battery case leans against the vertical plate 1003. The first movable block 85 in the inspection table 2 moving towards the placing plate 1001 moves in the first channel 1002. When the feeding shoe surface of the first movable block 85 contacts the battery case, the battery case leaning against the vertical plate 1003 remains stationary and generates a thrust on the continuously moving first movable block 85. The first movable block 85 under the thrust rotates on the fixed rod 83 and retracts into the base 22, while twisting the first compression spring 84. When the first movable block 85 continuously moves to the second channel 1004 on the vertical plate 1003, when the first movable block 85 loses the thrust generated by the battery case on itself, the first compression spring 84 automatically resets and drives the entire first movable block 85 to reset. During this continuous movement, the two sides of the battery case squeeze the front inclined surface 819 of the side movable block, and drive the side contact block 818 and the fifth spring telescopic rod 817 to contract. The two side contact blocks 818 first position the left and right sides of the battery case. After squeezing the side movable block, as the inspection table 2 continues to move, the surface of the battery case that previously generated a thrust on the first movable block 85 abuts against the rear contact block 814 and squeezes the rear contact block 814. At this time, the reset in the second channel 1004 is completed, and the entire inspection table 2 is driven to move in the reverse direction by the linear movement mechanism 9. During the reverse movement, the front contact block 86 passes through the second channel 1004 and the first channel 1002 again and contacts the opposite surface of the surface that previously generated a thrust on the first movable block 85 and pushes the battery case to move. It should be noted that a stop block 89 is provided in the base 22, and the stop block 89 can prevent the front contact block 86 from being squeezed by the battery case and rotating in the reverse direction when pushing the battery case to move. When the first movable block 85 is pushed by the battery case to an angular deviation, the continuously moving first movable block 85 will pass under the battery case. The distance from the first movable block 85 under the battery case to the lower part of the second channel 1004 is very short. Even if the first movable block 85 briefly lifts the battery case under the battery case, it can quickly recover, and the weight of the battery case itself can also prevent it from being lifted by the first movable block 85. At this time, the battery case 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 case also contacts the longitudinal contact block 1301. The entire feeding process is completed. The process of placing the battery cases on the placing plate 1001 one by one can be completed manually or by an external conveying device. It should be noted that no matter by what method the battery cases are placed on the placing plate 1001, it is necessary to ensure that the open end of the battery case faces upward;

[0119] After the loading is completed, the entire inspection table 2 continues to move towards the cover plate 32. During the movement, it passes through the height limit frame 1101. The guiding inclined surface 1103 on the height limit block 1102 on the height limit frame 1101 contacts the battery case, causing extrusion on the battery case. After being extruded, the battery case moves downward and extrudes the longitudinal contact block 1301 and the first spring telescopic rod 1302. The setting of the height limit block 1102 can make the battery cases with different heights have the same height through extrusion, which is convenient for the subsequent sealing cover 26 to wrap the entire battery case. It should be noted that when the size of the height limit block 1102 itself is not adjusted, the range of automatic height limitation of the height limit block 1102 for battery cases with different heights is limited. The height limit block 1102 is mainly used to adjust battery cases with relatively small size differences or battery cases of the same type with different heights caused by production tolerances. When it is necessary to limit the height of battery cases with large size differences, the height limit block 1102 with different sizes should be replaced. By changing the inclination angle and length of the guiding inclined surface 1103 on the height limit block 1102, the range of automatic height limitation can be further improved. Overall, it still automatically adjusts various battery cases with relatively small height differences to avoid the phenomenon that the battery case 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. During the process of the battery case passing through the height limit block 1102, when the battery case only contacts the front contact block 86 and the rear contact block 814 due to problems such as the placement position during the previous loading process and does not cause extrusion on the front inclined surface 819 of the side contact block 818, the bottom of the battery case that is extruded downward by the height limit block 1102 can cause extrusion on the upper inclined surface 820 of the side contact block 818, and the automatic center positioning can also be achieved to enter between the four contact blocks. At this time, the entire height limitation process is completed, and at the same time, the steps that were not accurately centered during the loading process are further improved;

[0120] After the height-limiting step is completed, the continuously moving inspection table 2 reaches the position of the loading rack 1005, and the gear disk 23 meshes with the loading rack 1005. During the continuous movement, the gear disk 23 is driven to rotate, thereby driving the continuous rotation of the bidirectional screw 24. At this time, the two sealing covers 26 will start to move towards each other to wrap the battery case. It should be noted that during the process of the sealing cover 26 moving to wrap the battery case, there is always a certain contact between the height-limiting block 1102 and the battery case. After the second sealing pad 35 on the sealing cover 26 has a certain contact with the top of the battery case, the height-limiting block 1102 is completely separated from the battery case. Therefore, it is necessary to control the distance between the loading rack 1005 and the height-limiting block 1102. At the same time, 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 in contact with the battery case briefly at the same time. When the gear disk 23 on the continuously moving inspection table 2 disengages from the loading gear, the two sealing covers 26 also completely wrap the battery case, and then continue to move below the cover plate 32. The cover plate 32 is docked with the sealing cover 26 through the cylinder 34 and performs the inspection work in the above manner;

[0121] After the inspection is completed, the inspection table 2 continues to move towards the unloading component 12. Before contacting the pressing plate 1202 in the unloading component 12, the gear disk 23 will first mesh with the unloading rack 1207. At this time, the direction in which the unloading rack 1207 drives the gear disk 23 to rotate is opposite to the direction of rotation when the inspection table 2 was driven to rotate by the loading gear when moving from the loading component 10 to the unloading component 12 previously. At this time, the meshing with the unloading rack 1207 drives the bidirectional screw 24 to rotate to open the two sealing covers 26 for subsequent automatic unloading;

[0122] 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 support of the battery case by the detection table 2 can be achieved only when there is no obstruction from the second movable block 812. When the detection table 2 moves towards the feeding component 10, it will drive the battery case to move together. However, the battery case is restricted by the contraction block 1204, and the contraction block 1204 is restricted by the inner wall of the contraction groove and cannot rotate in the direction of the feeding component 10. Therefore, the effect of restricting the movement of the battery case can be achieved, and then the automatic blanking step can be completed. The difference in length between the pressing plate 1202 and the outer plate 1203 is certain, so as to ensure the above effect. For example, if the battery case is of a larger size, the length of the pressing plate 1202 extending into the base 22 is shorter when it contacts the battery case, but it also presses the second movable block 812 into the interior of the base 22. At this time, the distance between the contraction block 1204 and the battery case will also become shorter, so as to ensure that when the pressing plate 1202 gradually releases the restriction on the second movable block 812, the contraction block 1204 can start to restrict the battery case synchronously. Small weight sensors or displacement sensors can be set on the contact surface between the pressing plate 1202 and the battery case to ensure that a signal can be transmitted to the controller to stop the continuous movement of the detection table 2 when contacting. The same effect can also be achieved without setting sensors, but it will further press the front contact block 86, and the result of automatic blanking remains unchanged;

[0123] After the automatic blanking is completed, the detection table 2 moving towards the feeding component 10 will first pass through the blanking rack 1207, at this time the sealing cover 26 closes again, then pass through the bottom of the cover plate 32. At this time, there is no battery case in the base 22 and it can pass directly without detection, then contact the feeding rack 1005. At this time, the sealing cover 26 will open, then pass through the height limit frame 1101, and finally come to the feeding component 10 in an open state to perform the second round of feeding work, and the automated loading, unloading and detection work is carried out in a cycle.

[0124] Embodiment 4: This embodiment also provides a method for detecting using the square battery case airtight detection device in Embodiment 1. The method includes the following steps:

[0125] S1. Place the battery case inside the base 22. At this time, the battery case is located between the two sealing covers 26. Then, start the synchronous moving mechanism to drive the two sealing covers 26 to move towards each other and dock. After docking, the two sealing covers 26 form a whole and cooperate with the base 22 to wrap the battery case inside. The inner walls of the tops of the two sealing covers 26 abut against the open end at the top of the battery case to form a seal. Then, drive the cover plate 32 to move towards the air inlet cavity 27 formed after the docking of the two sealing covers 26 through the lifting component until the cover plate 32 abuts against the tops of the two sealing covers 26 and forms a seal. Finally, start the steam generator 31 to introduce steam into the battery case through the first air inlet 38. When there is a leak point in the battery case, the steam inside the battery case gushes out from the leak point into the cavity 28 and is sprayed onto the position corresponding to the leak point on the glass sealing cover 26 and / or the base 22, and at the same time, fog points are formed on the glass material to locate the leak point on the battery case;

[0126] S2. When steam is introduced into the battery case and there is no leak point in the battery case, too much steam introduced into the battery case causes the whole battery case to move downward. During the movement, it exerts pressure on the longitudinal contraction mechanism 13, the overall height of the battery case decreases, while the height of the sealing cover 26 remains unchanged. At this time, the top of the sealing cover 26 loses contact and seal with the top of the battery case, and all the steam inside the battery case leaks into the cavity 28 to prevent the battery case from deforming.

[0127] In the specific embodiments described above, the technical problems solved, technical solutions, and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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); Two mounting plates (36) are connected to the bottom of the cover plate (32), 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.

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 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.

6. The square battery case airtightness detection device according to claim 5, 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.

7. The square battery case airtightness detection device according to claim 6, 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).

8. The square battery case airtightness detection device according to claim 7, 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.

9. A method for testing using the square battery case airtightness testing device according to any one of claims 1 to 8, 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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