Battery pack shell compactness detection method

Abstract

The invention discloses a battery pack shell compactness detection method, and relates to the technical field of compactness detection.The battery pack shell compactness detection device comprises a detection pool, two strip-shaped plates are correspondingly installed on the rear surface of the detection pool, an upper plate is installed at the position, above the detection pool, of the side faces of the two strip-shaped plates, and two electric push rods are correspondingly installed on the lower surface of the upper plate; the lower ends of the two electric push rods are jointly provided with a first mounting plate, the two first clamping plates are used for clamping the two sides of the shell and carrying out first soaking, then the second clamping plates are used for clamping the front surface and the rear surface of the shell and then carrying out second soaking, and the surfaces, clamped on the front side and the rear side, of the shell are different; the surface covered by the first clamping plate can also meet water in the second soaking process, the situation that the compactness cannot be detected due to the fact that the clamping plates block small holes is avoided, the situation that the upper cover deviates due to vibration generated when the device operates is avoided through the four pressing bases, the four pressing bases can be driven to ascend when the electric push rod is shortened, and taking-down of the shell is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of density detection, and in particular to a method for detecting the density of a battery pack shell. Background Art

[0002] The existing method for testing the compactness of a battery shell is to cover the upper and lower covers of the battery box tightly, seal them with sealant, plug all the connector holes with baffle clips and sealing pads, immerse the entire battery box completely in a pool full of water, use a bracket to completely press the entire box into the water from the top of the battery box, keep the upper surface of the box underwater for a period of time, take out the box after the time is up, open the upper cover, and see if water has entered the box. In order to strengthen the fixation between the upper cover and the lower cover, it is necessary to fix the two with screws, but the number of screws for fixing the upper cover and the lower cover is large, and the installation and removal of the screws takes a long time, which reduces the detection efficiency. In order to avoid the above problems, clamping is used instead of screw fixation, but the clamping device of the shell needs to clamp the side wall of the shell. If the clamp just covers the small hole on the shell, water will not enter the shell through the small hole, and the shell compactness cannot be detected. At the same time, it is necessary to insert a sealing pad into each screw hole to waterproof the nut to prevent the screw from rusting when it encounters water, but the operation of inserting the sealing pad is very cumbersome. Therefore, a person skilled in the art has proposed a method for testing the compactness of a battery pack shell. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for detecting the compactness of a battery pack shell, which solves the problems in the above background.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for detecting the density of a battery pack shell, comprising a detection pool, wherein two strip plates are correspondingly installed on the rear surface of the detection pool, and upper plates are installed on the sides of the two strip plates above the detection pool, and two electric push rods are correspondingly installed on the lower surface of the upper plate, and a first mounting plate is commonly installed at the lower ends of the two electric push rods, a first mounting plate is provided inside the first mounting plate with a first cavity, a second mounting plate perpendicular to the first mounting plate is installed on the upper surface of the first mounting plate, a second cavity is provided inside the second mounting plate, a first motor is installed at the center of the upper surface of the second mounting plate, and a driving end of the first motor is provided with a motor that extends through the second cavity to the other end of the first cavity and connects to the bottom surface of the first cavity The rotatably connected shaft rod has a first gear installed on the surface of the shaft rod in the first cavity, and first through grooves are provided on both sides of the first mounting plate. Two first racks meshing with the first gear and aligned with the two first through grooves are correspondingly and slidably installed on the inner bottom surface of the first cavity. One end of each of the first racks passes through the corresponding first through groove and extends to the outside of the first mounting plate and is installed with a first clamping plate. A second gear is installed on the surface of the shaft rod inside the second cavity, and second through grooves are provided on both sides of the second mounting plate. Two second racks meshing with the second gear and aligned with the two second through grooves are slidably installed on the inner bottom surface of the second cavity. One end of each of the second racks passes through the aligned second through grooves and extends to the outside of the second mounting plate and is installed with a second clamping plate.

[0005] As a further technical solution of the present invention, two groups of mounting parts are correspondingly installed on the upper surface of the first mounting plate, and the ends of the two mounting parts in each group are jointly installed with rectangular blocks, each of the rectangular blocks is provided with an inner cavity, and a limit plate is slidably installed in each of the inner cavities, and a trapezoidal block extending to the outside of the rectangular block with the inclined surface facing downward is installed on one side of each of the limit plates, and a second spring is arranged on the other side of the limit plate in each of the inner cavities, and a movable groove communicating with the inner cavity is arranged on the upper surface of each of the rectangular blocks, and a shifting block extending through the movable groove to the outside of the rectangular block is installed on the surface of each of the limit plates.

[0006] As a further technical solution of the present invention, a side panel is installed on one side of the rectangular block on each of the strip panels, an empty groove is opened in each of the side panels, a group of round rods extending to the outside of the side panels are installed on the upper surface of each of the movable panels, a connecting plate is installed on the upper ends of each group of two round rods, and a rectangular plate is arranged on the side of each connecting plate just above the nearest trapezoidal block.

[0007] As a further technical solution of the present invention, a number of evenly distributed and compressed first springs are correspondingly arranged in each of the empty slots above the movable plate, two strip grooves are correspondingly opened on the side of each side plate on one side of the empty slot, and an extension plate that passes through the corresponding strip groove and extends to the outside of the side plate is installed on the side of each strip groove of each movable plate, and a pressure seat is installed on the lower surface of each extension plate.

[0008] As a further technical solution of the present invention, first fixed plates are installed on both sides of the detection pool, and a second motor is installed on the side of one of the first fixed plates, the driving end of the second motor passes through the corresponding first fixed plate and is installed with a bidirectional thread whose other end is rotatably connected to the other first fixed plate, and a thread seat is provided on each thread of the bidirectional thread, and a placing table is installed on the side of each thread seat above the detection pool, and a groove is provided on the upper surface of each placing table.

[0009] As a further technical solution of the present invention, second fixed plates are installed on both sides of the detection pool on one side of the first fixed plate, a sliding rod is installed between the two second fixed plates, and a sliding rod sliding on the sliding rod is installed on the side of each placement table.

[0010] The specific steps include: S1. Cover the upper cover and the lower cover of the battery shell tightly, and use sealant to seal the gap between the upper cover and the lower cover, then place the shell in the two grooves that match them, and then move the two shifting blocks to make them close to each other. Each moving shifting block drives the limit plate to move, and each moving limit plate compresses the second spring and drives the trapezoidal block into the inner cavity, so that the limit on the rectangular plate can be released. All compressed first springs rebound and drive the movable plate to descend. The descending movable plate drives the extension plate to descend and drives the connecting plate to descend through the round rod until the four pressure seats are pressed on the upper cover of the shell to limit the battery shell; S2, driving the two electric push rods to extend, driving the first mounting plate and its surface assembly to descend, the inclined surface of the trapezoidal block on the descending rectangular block hits the corresponding rectangular plate, the trapezoidal block enters the inner cavity due to the guidance of the inclined surface, and the second spring is compressed by the limit plate, when the trapezoidal block moves to the bottom of the rectangular plate, the second spring rebounds and drives the limit plate to restore the position, thereby driving the trapezoidal block to restore the position, until the lower surface of the first mounting plate contacts the upper surface of the shell, and the electric push rod stops extending; S3, the first motor drives the shaft to rotate, the rotating shaft drives the first gear and the second gear to rotate in the same direction, the rotating first gear drives the first clamping plates to approach each other through the two first racks, and the rotating second gear drives the two second clamping plates to move away from each other through the two second racks, until the two first clamping plates clamp the two sides of the battery housing, and the first motor is turned off; S4, the second motor drives the bidirectional thread to rotate, driving the two thread seats to move away from each other, and then driving the two placement tables to move away from each other, until the two placement tables are moved out from directly under the shell, and then the electric push rod extends to drive the first mounting plate and its surface components and the shell to descend, until the shell is completely immersed in the water of the detection tank, and then the electric push rod shortens to drive the shell to restore its position through the above operation, and the four pressure seats continue to press down the upper cover of the shell; S5, the second motor drives the bidirectional thread to reverse and drive the two placement tables to approach each other through the above operation until the shell is re-supported, then the first motor drives the shaft to reverse and drive the first gear and the second gear to reverse, the reversed first gear drives the two first clamping plates to move away from each other through the above operation, and the reversed second gear drives the two second clamping plates to approach each other through the above operation until the front and rear surfaces of the shell are clamped; S6, the second motor drives the bidirectional thread to rotate. Through the above operation, the two placement platforms are moved away from each other, and the electric push rod is extended to drive the first mounting plate and its surface components and the shell to descend so that they are completely immersed in the water. Then the electric push rod is shortened to drive the shell to rise. Then the second motor drives the bidirectional thread to reverse. Through the above operation, the positions of the two placement platforms are restored to support the shell. S7. The first motor drives the shaft to rotate. Through the above operation, the two second clamps move away from each other to release the clamping of the shell. Then the first motor is turned off, and the electric push rod continues to shorten to drive the first mounting plate and its surface components to rise until the position is restored. At the same time, the rising first mounting plate drives the two trapezoidal blocks on the two rectangular blocks to rise. Each rising trapezoidal block drives the connecting plate to rise through the rectangular plate. The rising connecting plate drives the movable plate to rise through the round rod. Each rising movable plate compresses the first spring to rise and drives the pressure seat to rise to release the downward pressure on the shell. Remove the shell, open it and observe the inner surfaces of the upper cover and the lower cover. If there are water stains, it means there are small holes. If there are no water stains, it means there are no small holes. The density is perfect. Beneficial Effects

[0011] The present invention provides a method for detecting the compactness of a battery pack shell. Compared with the prior art, the method has the following beneficial effects: 1. A method for detecting the density of a battery pack shell. The device uses a clamping device to fix the upper cover and the lower cover, and does not require screws for fixing, thereby reducing the time spent on loading and unloading between the upper cover and the lower cover, and does not require a rubber plug to protect the nut, thereby reducing the economic expenditure on purchasing rubber plugs. At the same time, two first clamping plates are used to clamp the two sides of the shell for the first immersion in water, and then the second clamping plate is used to clamp the front and rear surfaces of the shell for the second immersion in water. The surfaces of the shell clamped on the front and rear sides are different, and even if the surface covered by the first clamping plate last time can also be exposed to water in the second immersion, so that the clamping plate will not block the small hole and make it impossible to detect the density. The detection time is short, and the detection efficiency is high. At the same time, four pressure seats are used to press down the upper cover to avoid the upper cover being dislocated due to the vibration generated during the operation of the device. When the electric push rod is shortened to drive the first mounting plate to restore its position, it can also drive the four pressure seats to rise so that it does not affect the removal of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a method for detecting the compactness of a battery pack shell; Figure 2 A working state diagram of a battery pack shell density detection method; Figure 3 A rear view of a method for testing the compactness of a battery pack shell; Figure 4 A cross-sectional view of a first mounting plate of a method for detecting the compactness of a battery pack shell; Figure 5 A cross-sectional view of a second mounting plate of a method for detecting the compactness of a battery pack shell; Figure 6 A side panel cross-sectional view of a battery pack shell density detection method; Figure 7 A schematic diagram of the structure of a motor assembly for a method for testing the compactness of a battery pack shell; Figure 8 A rectangular block cross-sectional view of a battery pack shell density detection method; Fig. 9 The figure is a schematic diagram of the structure of a clamping assembly for a method for testing the compactness of a battery pack shell.

[0013] In the figure: 1, detection pool; 2, strip plate; 3, upper plate; 4, electric push rod; 5, first mounting plate; 6, first cavity; 7, second mounting plate; 8, second cavity; 9, first motor; 10, shaft; 11, first gear; 12, first rack; 13, first through slot; 14, first clamping plate; 15, second gear; 16, second rack; 17, second through slot; 18, second clamping plate; 19, side plate; 20, empty slot; 21, movable plate; 22, first spring; 23. Round rod; 24. Connecting plate; 25. Strip groove; 26. Extension plate; 27. Press seat; 28. Rectangular plate; 29. ​​Mounting piece; 30. Rectangular block; 31. Inner cavity; 32. Limiting plate; 33. Trapezoidal block; 34. Second spring; 35. Movable groove; 36. Shifting block; 37. First fixed plate; 38. Second motor; 39. Bidirectional thread; 40. Threaded seat; 41. Placement table; 42. Groove; 43. Second fixed plate; 44. Slide rod; 45. Slider. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-9The present invention provides a technical solution for a battery pack shell density detection method: a battery pack shell density detection method, comprising a detection pool 1, characterized in that two strip plates 2 are correspondingly installed on the rear surface of the detection pool 1, and an upper plate 3 is installed on the side of the two strip plates 2 above the detection pool 1, and two electric push rods 4 are correspondingly installed on the lower surface of the upper plate 3, and a first mounting plate 5 is commonly installed at the lower ends of the two electric push rods 4, and a first cavity 6 is opened inside the first mounting plate 5, and a second mounting plate 7 perpendicular to the first mounting plate 5 is installed on the upper surface of the first mounting plate 5, and a second mounting plate 7 is opened inside the second mounting plate 7. The first cavity 8 is provided with a first motor 9 installed at the center of the upper surface of the second mounting plate 7. The driving end of the first motor 9 is provided with a shaft 10 which passes through the second cavity 8 and extends into the first cavity 6. The other end of the shaft 10 is rotatably connected to the inner bottom surface of the first cavity 6. A first gear 11 is installed on the surface of the shaft 10 in the first cavity 6. First through grooves 13 are provided on both sides of the first mounting plate 5. Two first racks 12 which mesh with the first gear 11 and are aligned with the two first through grooves 13 are correspondingly and slidably installed on the inner bottom surface of the first cavity 6. One end of each first rack 12 passes through the corresponding first through groove 13 and extends to the first mounting plate 6. The first clamping plate 14 is installed on the outside of the plate 5, the second gear 15 is installed on the surface of the shaft 10 inside the second cavity 8, and second through grooves 17 are opened on both sides of the second mounting plate 7. Two second racks 16 meshing with the second gear 15 and aligned with the two second through grooves 17 are slidably installed on the inner bottom surface of the second cavity 8. One end of each second rack 16 passes through the aligned second through grooves 17 and extends to the outside of the second mounting plate 7 and is installed with a second clamping plate 18. When in use, the first motor 9 drives the shaft 10 to rotate, and the rotating shaft 10 drives the first gear 11 and the second gear 15 to rotate in the same direction. Rotate, the rotating first gear 11 drives the first clamping plates 14 to approach each other through the two first racks 12, and the rotating second gear 15 drives the two second clamping plates 18 to move away from each other through the two second racks 16, until the two first clamping plates 14 clamp the two sides of the battery shell, the first motor 9 drives the shaft 10 to reverse and drive the first gear 11 and the second gear 15 to reverse, the reversed first gear 11 makes the two first clamping plates 14 move away from each other through the above operation, and the reversed second gear 15 drives the two second clamping plates 18 to approach each other through the above operation until the front and rear surfaces of the shell are clamped.

[0016] See also Figure 1-3 , Figure 6 and Figure 8Two groups of mounting members 29 are correspondingly mounted on the upper surface of the first mounting plate 5. The ends of each group of two mounting members 29 are commonly mounted with a rectangular block 30. Each rectangular block 30 is provided with an inner cavity 31. A limit plate 32 is slidably mounted in each inner cavity 31. A trapezoidal block 33 extending to the outside of the rectangular block 30 and with an inclined surface facing downward is mounted on one side of each limit plate 32. A second spring 34 is arranged on the other side of each inner cavity 31 and the limit plate 32. The upper surface of each rectangular block 30 is provided with a spring 34 that is compatible with the inner cavity 31. The movable groove 35 connected to the cavity 31, the surface of each limit plate 32 is installed with a shifting block 36 extending through the movable groove 35 to the outside of the rectangular block 30, the side of each strip plate 2 is installed with a side plate 19 on one side of the rectangular block 30, each side plate 19 is provided with an empty groove 20, and the upper surface of each movable plate 21 is correspondingly installed with a group of round rods 23 extending to the outside of the side plate 19, and the upper ends of each group of two round rods 23 are jointly installed with a connecting plate 24, and the side of each connecting plate 24 is connected to the nearest trapezoidal block A rectangular plate 28 is arranged directly above each of the movable plates 21. A plurality of evenly distributed first springs 22 in a compressed state are arranged in each of the empty slots 20 above the movable plate 21. Two strip grooves 25 are arranged on the side of each side plate 19 corresponding to the empty slot 20. An extension plate 26 penetrating the corresponding strip groove 25 and extending to the outside of the side plate 19 is installed on the side of each movable plate 21. A pressure seat 27 is installed on the lower surface of each extension plate 26. When in use, the movable plate 21 is moved. The two shifting blocks 36 bring them closer to each other, and each moving shifting block 36 drives the limiting plate 32 to move. Each moving limiting plate 32 compresses the second spring 34 and drives the trapezoidal block 33 to enter the inner cavity 31, so that the restriction on the rectangular plate 28 can be released. All compressed first springs 22 rebound and drive the movable plate 21 to descend. The descending movable plate 21 drives the extension plate 26 to descend and drives the connecting plate 24 to descend through the round rod 23 until the four pressure seats 27 are pressed on the upper cover of the shell to limit the battery shell.

[0017] See also Figure 1-3 , first fixing plates 37 are installed on both sides of the detection pool 1, and a second motor 38 is installed on the side of one of the first fixing plates 37, and a driving end of the second motor 38 passes through the corresponding first fixing plate 37 and is installed with a two-way thread 39 whose other end is rotatably connected to the other first fixing plate 37, and a thread seat 40 is provided on each thread of the two-way thread 39, and a placement table 41 is installed on the side of each thread seat 40 above the detection pool 1, and a groove 42 is opened on the upper surface of each placement table 41, and second fixing plates 43 are installed on one side of the first fixing plate 37 on both sides of the detection pool 1, and a sliding rod 44 is installed between the two second fixing plates 43, and a sliding rod 45 sliding on the sliding rod 44 is installed on the side of each placement table 41. When in use, the second motor 38 drives the two-way thread 39 to rotate, and the two placement tables 41 are moved away from each other through the above operation.

[0018] The specific steps include: S1. Cover the upper cover and the lower cover of the battery shell tightly, and use sealant to seal the gap between the upper cover and the lower cover, then place the shell in the two grooves 42 that match them, and then move the two shifting blocks 36 to make them close to each other, each moving shifting block 36 drives the limit plate 32 to move, and each moving limit plate 32 compresses the second spring 34 and drives the trapezoidal block 33 to enter the inner cavity 31, so that the limit on the rectangular plate 28 can be released, and all compressed first springs 22 rebound to drive the movable plate 21 to descend, and the descending movable plate 21 drives the extension plate 26 to descend and drives the connecting plate 24 to descend through the round rod 23, until the four pressure seats 27 are pressed on the upper cover of the shell to limit the battery shell; S2, drive the two electric push rods 4 to extend, drive the first mounting plate 5 and its surface components to descend, the inclined surface of the trapezoidal block 33 on the descending rectangular block 30 hits the corresponding rectangular plate 28, the trapezoidal block 33 enters the inner cavity 31 due to the guidance of the inclined surface, and the second spring 34 is compressed by the limit plate 32, when the trapezoidal block 33 moves to the bottom of the rectangular plate 28, the second spring 34 rebounds and drives the limit plate 32 to restore the position, thereby driving the trapezoidal block 33 to restore the position, until the lower surface of the first mounting plate 5 contacts the upper surface of the shell, and the electric push rod 4 stops extending; S3, the first motor 9 drives the shaft 10 to rotate, the rotating shaft 10 drives the first gear 11 and the second gear 15 to rotate in the same direction, the rotating first gear 11 drives the first clamping plates 14 to approach each other through the two first racks 12, and the rotating second gear 15 drives the two second clamping plates 18 to move away from each other through the two second racks 16, until the two first clamping plates 14 clamp the two sides of the battery housing, and the first motor 9 is turned off; S4, the second motor 38 drives the bidirectional thread 39 to rotate, drives the two thread seats 40 to move away from each other, and then drives the two placement platforms 41 to move away from each other, until the two placement platforms 41 move out from directly under the shell, then the electric push rod 4 extends to drive the first mounting plate 5 and its surface components and the shell to descend, until the shell is completely immersed in the water of the detection tank 1, then the electric push rod 4 shortens to drive the shell position to recover through the above operation, and the four pressure seats 27 continue to press down the shell cover; S5, the second motor 38 drives the bidirectional thread 39 to reverse, and through the above operation, the two placement platforms 41 are driven to approach each other until the shell is re-supported, and then the first motor 9 drives the shaft 10 to reverse and drive the first gear 11 and the second gear 15 to reverse, the reversed first gear 11 drives the two first clamping plates 14 to move away from each other through the above operation, and the reversed second gear 15 drives the two second clamping plates 18 to approach each other through the above operation until the front and rear surfaces of the shell are clamped; S6, the second motor 38 drives the bidirectional thread 39 to rotate. Through the above operation, the two placement platforms 41 are moved away from each other, and the electric push rod 4 is extended to drive the first mounting plate 5 and its surface components and the shell to descend so that they are completely immersed in the water. Then the electric push rod 4 is shortened to drive the shell to rise. Then the second motor 38 drives the bidirectional thread 39 to reverse. Through the above operation, the positions of the two placement platforms 41 are restored to support the shell. S7, the first motor 9 drives the shaft 10 to rotate. Through the above operation, the two second clamps 18 move away from each other to release the clamping of the shell. Then the first motor 9 is turned off, and the electric push rod 4 continues to shorten to drive the first mounting plate 5 and its surface components to rise until the position is restored. At the same time, the rising first mounting plate 5 drives the two trapezoidal blocks 33 on the two rectangular blocks 30 to rise. Each rising trapezoidal block 33 drives the connecting plate 24 to rise through the rectangular plate 28. The rising connecting plate 24 drives the movable plate 21 to rise through the round rod 23. Each rising movable plate 21 compresses the first spring 22 to rise and drives the pressure seat 27 to rise to release the downward pressure on the shell. The shell is removed and the inner surfaces of the upper cover and the lower cover are observed after opening. If there are water stains, it means there are small holes. If there are no water stains, it means there are no small holes and the density is perfect.

Claims

1. A method for detecting the compactness of a battery pack shell, comprising a detection cell (1), characterized in that: Two strip plates (2) are correspondingly mounted on the rear surface of the detection pool (1); upper plates (3) are mounted on the sides of the two strip plates (2) above the detection pool (1); two electric push rods (4) are correspondingly mounted on the lower surface of the upper plate (3); a first mounting plate (5) is mounted on the lower ends of the two electric push rods (4); a first cavity (6) is provided inside the first mounting plate (5); a second mounting plate (7) perpendicular to the first mounting plate (5) is mounted on the upper surface of the first mounting plate (5); a second cavity (8) is provided inside the second mounting plate (7); a first motor (9) is mounted at the center of the upper surface of the second mounting plate (7); a shaft (10) is mounted at the driving end of the first motor (9) and extends through the second cavity (8) into the first cavity (6); the other end of the shaft (10) is rotatably connected to the inner bottom surface of the first cavity (6); a first gear (1) is mounted on the surface of the shaft (10) in the first cavity (6). 1), first through slots (13) are provided on both sides of the first mounting plate (5), two first racks (12) meshing with the first gear (11) and aligned with the two first through slots (13) are slidably mounted on the inner bottom surface of the first cavity (6), one end of each of the first racks (12) passes through the corresponding first through slot (13) to extend to the outside of the first mounting plate (5) and is mounted with a first clamping plate (14), a second gear (15) is mounted on the surface of the shaft (10) inside the second cavity (8), second through slots (17) are provided on both sides of the second mounting plate (7), two second racks (16) meshing with the second gear (15) and aligned with the two second through slots (17) are slidably mounted on the inner bottom surface of the second cavity (8), one end of each of the second racks (16) passes through the aligned second through slots (17) to extend to the outside of the second mounting plate (7) and is mounted with a second clamping plate (18).

2. A battery pack shell density detection method according to claim 1, characterized in that: Two groups of mounting members (29) are correspondingly mounted on the upper surface of the first mounting plate (5), and a rectangular block (30) is commonly mounted on the ends of the two mounting members (29) of each group, and each rectangular block (30) is provided with an inner cavity (31), and a limit plate (32) is slidably mounted in each inner cavity (31), and a trapezoidal block (33) extending to the outside of the rectangular block (30) and with an inclined surface facing downward is mounted on one side of each limit plate (32), and a second spring (34) is arranged on the other side of the limit plate (32) in each inner cavity (31), and a movable groove (35) communicating with the inner cavity (31) is arranged on the upper surface of each rectangular block (30), and a shifting block (36) passing through the movable groove (35) and extending to the outside of the rectangular block (30) is mounted on the surface of each limit plate (32).

3. A battery pack shell density detection method according to claim 2, characterized in that: A side plate (19) is installed on the side of each strip plate (2) on one side of the rectangular block (30), and a hollow groove (20) is opened in each side plate (19). A group of round rods (23) extending to the outside of the side plate (19) are installed on the upper surface of each movable plate (21), and a connecting plate (24) is installed on the upper ends of each group of two round rods (23). A rectangular plate (28) is arranged on the side of each connecting plate (24) just above the nearest trapezoidal block (33).

4. A battery pack shell density detection method according to claim 3, characterized in that: A plurality of evenly distributed and compressed first springs (22) are correspondingly arranged above the movable plate (21) in each of the empty slots (20); two strip grooves (25) are correspondingly opened on the side of each of the side plates (19) on one side of the empty slot (20); an extension plate (26) is installed on the side of each of the strip grooves (25) and extends to the outside of the side plate (19) through the corresponding strip groove (25); and a pressure seat (27) is installed on the lower surface of each of the extension plates (26).

5. A battery pack shell density detection method according to claim 1, characterized in that: First fixing plates (37) are installed on both sides of the detection pool (1), wherein a second motor (38) is installed on the side of one of the first fixing plates (37), a driving end of the second motor (38) passes through the corresponding first fixing plate (37) and is installed with a bidirectional thread (39) whose other end is rotatably connected to the other first fixing plate (37), each thread of the bidirectional thread (39) is provided with a thread seat (40), and a placement table (41) is installed on the side of each thread seat (40) above the detection pool (1), and a groove (42) is provided on the upper surface of each placement table (41).

6. A battery pack shell density detection method according to claim 5, characterized in that: Second fixing plates (43) are installed on both sides of the detection pool (1) on one side of the first fixing plate (37), a sliding rod (44) is installed between the two second fixing plates (43), and a sliding rod (45) sliding on the sliding rod (44) is installed on the side of each placement platform (41).

7. A battery pack shell density detection method according to claim 6, characterized in that: The specific steps include: S1. Close the upper cover and the lower cover of the battery housing and seal the gap between the upper cover and the lower cover with a sealant. Then, place the housing in two grooves (42) that match the housing. Then, move the two shifting blocks (36) to make them close to each other. Each movable shifting block (36) drives the limiting plate (32) to move. Each movable limiting plate (32) compresses the second spring (34) and drives the trapezoidal block (33) into the inner cavity (31), thereby releasing the limit on the rectangular plate (28). All compressed first springs (22) rebound and drive the movable plate (21) to descend. The descending movable plate (21) drives the extension plate (26) to descend and drives the connecting plate (24) to descend through the round rod (23) until the four pressure seats (27) are pressed on the upper cover of the housing to limit the battery housing. S2, driving the two electric push rods (4) to extend, driving the first mounting plate (5) and its surface components to descend, the inclined surface of the trapezoidal block (33) on the descending rectangular block (30) touches the corresponding rectangular plate (28), and the trapezoidal block (33) enters the inner cavity (31) due to the guidance of the inclined surface, and compresses the second spring (34) through the limit plate (32), when the trapezoidal block (33) moves to the bottom of the rectangular plate (28), the second spring (34) rebounds and drives the limit plate (32) to restore its position, thereby driving the trapezoidal block (33) to restore its position, until the lower surface of the first mounting plate (5) contacts the upper surface of the shell, and the electric push rod (4) stops extending; S3, the first motor (9) drives the shaft (10) to rotate, the rotating shaft (10) drives the first gear (11) and the second gear (15) to rotate in the same direction, the rotating first gear (11) drives the first clamping plates (14) to move closer to each other through the two first racks (12), and the rotating second gear (15) drives the two second clamping plates (18) to move away from each other through the two second racks (16), until the two first clamping plates (14) clamp the two sides of the battery housing, and the first motor (9) is turned off; S4, the second motor (38) drives the bidirectional thread (39) to rotate, drives the two thread seats (40) to move away from each other, and then drives the two placement tables (41) to move away from each other, until the two placement tables (41) are moved out from under the shell, and then the electric push rod (4) extends to drive the first mounting plate (5) and its surface components and the shell to descend, until the shell is completely immersed in the water of the detection pool (1), and then the electric push rod (4) shortens to drive the shell to restore its position through the above operation, and the four pressure seats (27) continue to press down the shell cover; S5, the second motor (38) drives the bidirectional thread (39) to reverse and drive the two placement tables (41) to approach each other through the above operation until the shell is re-supported, then the first motor (9) drives the shaft (10) to reverse and drive the first gear (11) and the second gear (15) to reverse, the reversed first gear (11) drives the two first clamping plates (14) to move away from each other through the above operation, and the reversed second gear (15) drives the two second clamping plates (18) to approach each other through the above operation until the front and rear surfaces of the shell are clamped; S6, the second motor (38) drives the bidirectional thread (39) to rotate, and through the above operation, the two placement platforms (41) move away from each other, the electric push rod (4) extends to drive the first mounting plate (5) and its surface components and the shell to descend so that they are completely immersed in the water, and then the electric push rod (4) shortens to drive the shell to rise, and then the second motor (38) drives the bidirectional thread (39) to reverse, and through the above operation, the two placement platforms (41) are restored to their original positions to support the shell; S7, the first motor (9) drives the shaft (10) to rotate. Through the above operation, the two second clamping plates (18) move away from each other to release the clamping of the shell. Then, the first motor (9) is turned off, and the electric push rod (4) continues to shorten to drive the first mounting plate (5) and its surface components to rise until the position is restored. At the same time, the rising first mounting plate (5) drives the two trapezoidal blocks (33) on the two rectangular blocks (30) to rise. Each rising trapezoidal block (33) drives the connecting plate (24) to rise through the rectangular plate (28). The rising connecting plate (24) drives the movable plate (21) to rise through the round rod (23). Each rising movable plate (21) compresses the first spring (22) to rise and drives the pressure seat (27) to rise to release the downward pressure on the shell. The shell is removed and opened to observe the inner surfaces of the upper cover and the lower cover. If there is water stain, it means there are small holes. If there is no water stain, it means there are no small holes and the density is perfect.

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