Airtightness detection tool for CTC structure of power battery box body of new energy automobile

Abstract

The utility model discloses a new energy automobile power battery box CTC structure airtightness detection tool comprising a support pedestal, the support pedestal is provided with a substrate, and the substrate is fixedly provided with a first sealing ring and a first pressing mechanism; a vertical frame and a horizontal driving mechanism controlling the vertical frame to slide are assembled on the supporting base in a sliding mode, a pressing plate is connected to the vertical frame in an up-down sliding mode, and a lifting driving mechanism controlling the pressing plate to move up and down is installed on the vertical frame. A second sealing ring is fixedly arranged on the lower side of the pressing plate, the lifting driving mechanism drives the pressing plate to move downwards, the second sealing ring can be sealed on the upper surface of the open thin-edge structure of the middle cover, and an inner locking mechanism is installed on the pressing plate and provided with a second pressing block located below the pressing plate. And the inner locking mechanism can enable the second pressing block to be upwards pressed on the lower surface of the open thin-edge structure of the middle cover. The utility model has the beneficial effects that the technical problem that the bottom of the thin edge of the middle cover is not supported is solved, and the automatic detection of the air tightness of the battery box body with the CTC structure can be realized at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection of batteries for new energy vehicles, and in particular to a CTC structure air tightness detection tool for a power battery box for new energy vehicles. Background Art

[0002] At present, the mainstream power battery box technology in the new energy vehicle market is the CTP structure, which means that the integration from the battery cell to the box omits the intermediate module link, that is, a module-free power battery. The cost of this structure battery pack is relatively high. In order to reduce the manufacturing cost of the whole vehicle, a CTC structure battery pack structure came into being. This structure further combines the battery box cover and the body floor into one, further reduces parts, simplifies production steps, and reduces costs while increasing battery capacity and endurance. As the power source of the whole vehicle, the air tightness of the battery pack of new energy vehicles directly affects the safety of the whole vehicle. Therefore, it is very important to detect the air tightness of the battery pack.

[0003] In terms of physical structure, the battery box of the CTC structure includes a middle cover opening at the top and a main body opening at the bottom. The open end of the middle cover has a circumferential thin edge structure. When performing airtightness testing, the upper and lower open ends need to be blocked, and then the airtight space is inflated for testing. In the prior art, the battery box is usually placed on a substrate with a sealing strip to seal the main body opening at the bottom, and the box is pressed around with a cylinder; for the sealing of the middle cover opening at the top of the box, a pressure plate with a sealing strip is used to manually press down. In the process of pressing the pressure plate downward, the force of the pressure plate is applied to the thin edge structure of the middle cover. Since the bottom of the thin edge structure of the middle cover lacks a supporting structure, the pressure plate easily deforms the middle cover, thereby affecting the airtightness of the battery box; secondly, manual operation is used for testing, and the testing efficiency is low, which is not conducive to mass production of products. Utility Model Content

[0004] In view of this, the utility model provides a CTC structure airtightness detection tool for a new energy vehicle power battery box, which solves the technical problem of no support at the bottom of the thin edge of the middle cover, and can realize automatic detection of the airtightness of the CTC structure battery box.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A new energy vehicle power battery box CTC structure airtightness detection tooling, the key is to include:

[0007] A support base, wherein the support base is provided with a base plate, and the base plate is fixed with a first sealing ring for sealing the opening of the battery box body;

[0008] A first pressing mechanism disposed on the substrate, used to press the main body opening at the lower end of the battery box onto the first sealing ring;

[0009] A stand frame is slidably mounted on the support base in the horizontal direction, and the support base is provided with a horizontal driving mechanism for controlling the stand frame to slide in the length direction of the support base; a pressing plate is slidably connected to the stand frame, and a lifting driving mechanism for controlling the pressing plate to move up and down is installed on the stand frame;

[0010] A second sealing ring is fixedly provided on the lower side of the pressing plate, and the lifting drive mechanism drives the pressing plate to move downward, so that the second sealing ring can be sealed on the upper surface of the open thin-edge structure of the middle cover. An internal locking mechanism is installed on the pressing plate, and the internal locking mechanism has a second pressing block located below the pressing plate. When the second sealing ring is sealed on the upper surface of the open thin-edge structure of the middle cover, the internal locking mechanism can press the second pressing block upward against the lower surface of the open thin-edge structure of the middle cover.

[0011] With the above structure, the first clamping mechanism can press the main body opening at the lower end of the battery case against the first sealing ring of the substrate, thereby ensuring the sealing effect of the main body opening; when the middle cover opening on the upper part of the battery case is sealed, the lifting drive mechanism drives the pressure plate to press on the middle cover opening, and the second sealing ring can seal on the upper surface of the thin edge structure of the middle cover opening; the second pressure block is pressed upward on the lower surface of the thin edge structure of the middle cover opening through the internal locking mechanism, thereby effectively providing upward support for the thin edge structure, which is equivalent to fixing the second sealing ring in an upper and lower clamping manner, thereby ensuring that the middle cover will not be deformed when the pressure plate is pressed downward.

[0012] Preferably, the first clamping mechanism includes a first cylinder assembly distributed on the circumferential edge of the substrate, the first cylinder assembly includes a first cylinder body and a first piston rod, the first piston rod can be extended and retracted up and down in the first cylinder body and can rotate relative to the first cylinder body, and a third pressure block is provided at the end of the first piston rod.

[0013] Preferably: the stand comprises a supporting base plate and a column fixed on the supporting base plate, the lifting drive mechanism comprises a second cylinder body fixedly mounted on the supporting base plate, and a second piston rod that can be extended and retracted up and down in the second cylinder body, a lifting plate is connected to the upper part of the second piston rod, the lifting plate is slidably connected to the column, and the pressure plate is fixedly connected to the lifting plate; the second piston rod can drive the pressure plate to move downward when it moves downward.

[0014] Preferably, a first connecting seat is provided on the lifting plate, and a connecting through hole is provided on the upper portion of the second piston rod, and the connecting through hole is rotatably connected to the first connecting seat via a rotating shaft.

[0015] Preferably, a bearing is provided between the connecting through hole and the rotating shaft, and the connecting through hole and the bearing are rotatably connected in a ball joint manner.

[0016] Preferably, the inner locking mechanism comprises an inner buckle connecting rod assembly arranged below the pressure plate, the second pressure block is assembled on the outer end of the inner buckle connecting rod assembly, and a driving mechanism is installed on the pressure plate, the driving mechanism is used to control the movement of the inner buckle connecting rod assembly so that the second pressure block can press upwards against the lower surface of the open thin-edge structure of the middle cover or move downwards away from the lower surface of the open thin-edge structure of the middle cover.

[0017] Preferably, the driving mechanism comprises a third cylinder body fixed above the pressure plate and a third piston rod capable of telescopic movement relative to the third cylinder body, the third piston rod downwardly penetrates the pressure plate and extends downwardly, the lower end of the third piston rod is fixedly connected to a linkage seat, and the linkage seat is rotatably connected to the inner buckle connecting rod assembly through a linkage sheet;

[0018] The linkage seat moves downward, and under the linkage action of the linkage piece and the inner buckle connecting rod assembly, it can drive the second pressing block to rotate upward to the lower surface of the open thin edge structure of the middle cover;

[0019] The linkage seat moves upward, and under the linkage action of the linkage piece and the inner buckle connecting rod assembly, it can drive the second pressing block downward away from the lower surface of the open thin edge structure of the middle cover and retract it under the pressing plate.

[0020] Preferably: the inward-locking connecting rod assembly includes an articulated seat fixed on the lower side of the pressure plate, and a first connecting rod, a second connecting rod, and a third connecting rod hinged in sequence, wherein the first connecting rod and the third connecting rod are hinged on one end away from the second connecting rod at the articulated seat, and the articulated seat, the first connecting rod, the second connecting rod, and the third connecting rod constitute a four-bar linkage mechanism, the third connecting rod is provided with an outwardly extending extension portion, the second pressure block is fixedly connected to the extension portion, one end of the linkage piece is hinged to the linkage seat, and the other end is hinged to one end of the first connecting rod away from the articulated seat.

[0021] Preferably, a flange support plate is disposed on the middle fixing sleeve of the third piston rod, and a limit plate is disposed on the pressure plate at a position corresponding to the flange support plate, wherein the limit plate is used to limit the downward sliding distance of the third piston rod.

[0022] Preferably, it also includes a supporting crossbeam, which is used to be arranged on the upper part of the battery box body. A second clamping mechanism is provided on the base plate, and the second clamping mechanism is used to press the supporting crossbeam downward onto the upper part of the battery box body.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. By adopting the CTC structure airtightness detection tooling for the power battery box of a new energy vehicle provided by the utility model, the first clamping mechanism can press the main body opening at the lower end of the battery box onto the first sealing ring of the substrate, thereby ensuring the sealing effect of the main body opening. When the middle cover opening on the upper part of the battery box is sealed, the lifting drive mechanism drives the pressing plate to press onto the middle cover opening, and the second sealing ring can seal on the upper surface of the thin edge structure of the middle cover opening. The second pressing block is pressed upward onto the lower surface of the thin edge structure of the middle cover opening through the inner locking mechanism, thereby effectively forming an upward support for the thin edge structure, which is equivalent to fixing the second sealing ring in an upper and lower clamping manner, thereby ensuring that the middle cover will not be deformed during the downward pressing of the pressing plate. At the same time, the downward force of the second sealing ring counteracts the upward force of the second pressing block, thereby making the second sealing ring pressed more tightly, thereby further improving the sealing effect of the pressing plate on the middle cover opening.

[0025] 2. The CTC structure air tightness detection tooling for the new energy vehicle power battery box provided by the utility model realizes the automated detection of the air tightness of the CTC structure battery box, so as to facilitate the mass production of the battery box.

[0026] 3. The CTC structural airtightness detection tooling for the power battery box of a new energy vehicle provided by the utility model can play a role of avoidance by providing a movable stand and a first piston rod rotatable relative to the first cylinder body, so as to facilitate the upper and lower assembly of the battery box.

[0027] 4. The second piston rod and the lifting plate are connected in a rotating manner, which can absorb the up and down swing of the lifting plate and eliminate the parallelism error between the second piston rod and the lifting plate, thereby ensuring the smoothness of the movement of the lifting drive mechanism, that is, ensuring the smoothness of the up and down sliding of the pressure plate, so that the pressure plate can act more evenly on the middle cover opening of the battery box A, further improving the sealing effect of the pressure plate on the middle cover opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a CTC structure battery box A;

[0029] Figure 2 This is a schematic diagram of the structure of the airtight testing tooling;

[0030] Figure 3 This is a reference diagram of the use status of the airtightness detection tooling;

[0031] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0032] Figure 5 for Figure 3 A partial enlarged view of point C in the middle;

[0033] Figure 6Another structural schematic diagram of the airtightness detection tooling;

[0034] Figure 7 for Figure 6 A partial enlarged view of point D in the middle;

[0035] Figure 8 A three-dimensional cross-sectional view showing the connection relationship between the second piston rod 52 and the first connecting seat 54;

[0036] Fig. 9 for Figure 8 A partial enlarged view of point E in the middle;

[0037] Fig.10 It is a cross-sectional view of the airtightness testing tooling;

[0038] Fig.11 for Fig.10 A partial enlarged view of the F in the middle;

[0039] Fig.12 A three-dimensional cross-sectional view showing the connection relationship between the driving mechanism 7 and the pressing plate 6;

[0040] Fig.13 for Fig.12 A partial enlarged view of the G in the middle;

[0041] Fig.14 A cross-sectional view showing the connection relationship between the horizontal drive mechanism 9 and the stand 4. DETAILED DESCRIPTION

[0042] The utility model is further described below in conjunction with embodiments and drawings.

[0043] like Figure 1 The CTC structure battery case A shown has a middle cover opening at the upper part and a main body opening at the lower end, and the open end of the middle cover has a circumferentially surrounding thin edge structure A1.

[0044] like Figure 2 and 10As shown, a new energy vehicle power battery box CTC structure airtightness detection tooling includes a support base 1, a substrate 2 is fixedly mounted on the support base 1, and a first sealing ring 2a matching the edge of the main opening of the battery box A to be tested and a filling structure 2b adapted to the hollow structure inside the main opening of the battery box A are fixed on the substrate 2. After the battery box A is assembled on the substrate 2, the filling structure 2b can support the hollow structure inside the main opening to prevent the battery box A from deforming during detection. At the same time, the filling structure 2b also plays a positioning role. The battery box A is set downward from the top of the filling structure 2b, which can reach the preset installation position, thereby facilitating subsequent detection. A first clamping mechanism 3 is also provided on the substrate 2, and the first clamping mechanism 3 can press the main opening of the lower end of the battery box onto the first sealing ring 2a. The support base 1 is provided with a stand 4 which can slide forward and backward along its length direction, and a horizontal driving mechanism 9 for controlling the sliding of the stand 4. The stand 4 is connected to a pressure plate 6 which slides up and down along its height direction. The stand 4 is installed with a lifting driving mechanism 5 for controlling the up and down movement of the pressure plate 6.

[0045] Depend on Fig.11 It can be seen that the second sealing ring 6a is fixedly provided on the lower side of the pressing plate 6. The lifting drive mechanism 5 drives the pressing plate 6 to move downward, so that the second sealing ring 6a can be sealed on the upper surface of the open thin-edge structure A1 of the middle cover. In this embodiment, the circumferential edge of the lower side of the pressing plate 6 has a edging structure 61 extending downward, and the second sealing ring 6a is fixedly embedded in the bottom of the edging structure 61. When blocking, the second sealing ring 6a can better act on the thin-edge structure A1. An internal locking mechanism is installed on the pressing plate 6. The internal locking mechanism has a second pressing block 8a located below the pressing plate 6. When the second sealing ring 6a is sealed on the upper surface of the thin-edge structure A1, the internal locking mechanism can press the second pressing block 8a upward on the lower surface of the open thin-edge structure of the middle cover.

[0046] Based on the above structural design, the working principle of the airtight detection tooling is as follows: Place the battery box A to be tested from top to bottom on the substrate 2, and Fig.10 and 12It can be seen that the lower surface of the main opening at the lower end of the battery case A contacts the first sealing ring 2a, and the first clamping mechanism 3 presses the battery case A downward, so that the main opening at the lower end of the battery case A is tightly pressed on the first sealing ring 2a, ensuring the sealing effect of the main opening. Further, the horizontal drive mechanism 9 controls the stand 4 to slide forward to the detection position. At this time, the pressing plate 6 is located directly above the middle cover opening of the battery case A, and the lifting drive mechanism 5 drives the pressing plate 6 downward to press on the middle cover opening, so that the second sealing ring 6a is sealed on the upper surface of the thin edge structure A1 of the middle cover opening. Thereafter, the inner locking mechanism can make the second pressing block 8a press upward on the lower surface of the thin edge structure A1 of the middle cover opening to form a strong support for the lower side of the thin edge structure A1, thereby achieving the blocking of the middle cover opening of the battery case A. After the sealing is completed, the battery case A is inflated, and the subsequent inflation inspection steps can be carried out, which will not be repeated here. Such a sealing method can effectively provide upward support for the thin-edge structure A1, ensuring that the middle cover is not easily deformed during the downward pressing process of the pressure plate 6. At the same time, the downward force of the second sealing ring 6a counteracts the upward force of the second pressure block 8a, making the second sealing ring 6a pressed more tightly, further improving the sealing effect of the pressure plate 6 on the opening of the middle cover.

[0047] Further, such as Figure 2 and 3 As shown, the first pressing mechanism 3 includes a first cylinder assembly 31 distributed on the circumferential edge of the substrate 2. Figure 4 It can be seen that the first cylinder assembly 31 includes a first cylinder body 311 and a first piston rod 312. The first piston rod 312 can be extended and retracted up and down in the first cylinder body 311 and can rotate relative to the first cylinder body 311. A third pressure block 32 is provided at the end of the first piston rod 312. In this embodiment, a compacting portion 321 is fixed at the lower end of the third pressure block 32. In the initial state, the compacting portion 321 rotates horizontally to one side with the third pressure block 32, so that the compacting portion 321 is away from the installation position of the battery box A to be tested, so as to facilitate the assembly of the battery box A. After the battery box A to be tested is assembled on the substrate 2, the first piston rod 312 rotates to drive the compacting portion 321 to face the upper part of the battery box A body. The first cylinder body 311 drives the first piston rod 312 to move downward, so that the compacting portion 321 of the third pressure block 32 can be pressed tightly against the upper side of the battery box A body. In this embodiment, the first cylinder assembly 31 is evenly distributed on the circumferential edge of the base plate 2 so that the main body opening at the lower end of the battery box A is evenly pressed against the first sealing ring 2a, thereby ensuring the sealing effect of the main body opening.

[0048] For example Figure 3As shown, after the battery box A is installed on the substrate 2, a support beam 11 is provided on the upper part of the main body of the battery box A. The support beam 11 extends along the width direction of the battery box A. A second clamping mechanism 12 is provided on the substrate 2, which can press the support beam 11 downward on the upper part of the main body of the battery box. With this design, the support beam 11 can increase the force-bearing area of ​​the battery box A and prevent the battery box A from deforming during the detection process. Figure 5 It can be seen that the second clamping mechanism 12 includes two sets of second cylinder assemblies 121 arranged on the base plate 2, and the two sets of second cylinder assemblies 121 are respectively located at both ends of the length direction of the two ends of the supporting beam 11. In this embodiment, the second cylinder assembly 121 is consistent with the first cylinder assembly 31 in structure, and the clamping principle of the second clamping mechanism 12 is the same as the clamping principle of the first clamping mechanism 3, which will not be repeated here.

[0049] Further, combined with Figure 2 , 3 As shown in FIG. 5 , the second cylinder assembly 121 is provided with a positioning groove 13 at a position opposite to the filling structure 2b, and the positioning groove 13 plays a positioning role. When installing the support beam 11, the two ends of the support beam 11 are respectively inserted into the two positioning grooves 13, which can ensure that the second clamping mechanism 12 can act on the two ends of the support beam 11.

[0050] Please refer to Figure 3 and 6 The stand 4 includes a support base plate 41 and a column 42 fixed on the support base plate 41, and the support base plate 41 is slidably assembled on the support base 1. The lifting drive mechanism 5 includes a second cylinder body 51 fixedly mounted on the support base plate 41, and a second piston rod 52 that is telescopic in the second cylinder body 51. The upper part of the second piston rod 52 is connected to a lifting plate 53, and the lifting plate 53 can slide up and down along the height direction of the column 42. The pressing plate 6 is fixedly connected to the lifting plate 53. The second piston rod 52 drives the lifting plate 53 to move up and down, which can drive the pressing plate 6 to move up and down.

[0051] Re-attend Figure 6 and 8 A first guide rail 421 extending in the height direction is provided on one side of the column 42 facing the installation position of the battery box A, and a side of the lifting plate 53 opposite to the column 42 is slidably connected to the first guide rail 421 through a first slider 422 .

[0052] like Figure 6 As shown, the lifting plate 53 is provided with a first connecting seat 54, and then combined with Figure 8 and Fig. 9A connecting through hole 521 is provided on the upper part of the second piston rod 52, and the connecting through hole 521 is rotatably connected to the first connecting seat 54 through the rotating shaft a. In this embodiment, the center line of the rotating shaft a is perpendicular to the up and down sliding direction of the lifting plate 53. Such a design can absorb the up and down swing of the lifting plate 53, eliminate the parallelism error between the second piston rod 52 and the lifting plate 53, ensure the smoothness of the movement of the lifting drive mechanism 5, that is, ensure the smoothness of the up and down sliding of the pressing plate 6, so that the pressing plate 6 can act more evenly on the middle cover opening of the battery box A, which helps to improve the sealing effect of the pressing plate 6 on the middle cover opening.

[0053] For example Fig. 9 As shown, a bearing 55 is provided between the connecting through hole 521 and the rotating shaft a, and the connecting through hole 521 and the bearing 55 are rotatably connected in a ball joint manner. In this embodiment, the surface of the bearing 55 is a spherical structure, and the inner wall of the connecting through hole 521 is adapted to the structure of the bearing 55. Such a structural design can not only absorb the up and down swing of the lifting plate 53, but also absorb the left and right swing of the lifting plate 53, so that the center line of the second piston rod 52 is always parallel to the sliding track of the lifting plate 53, further improving the smoothness of the operation of the lifting drive mechanism 5.

[0054] Depend on Figure 6 and 7 As shown, the lower part of the column 42 is provided with a first limit block 14 extending outward, and the first limit block 14 is directly opposite to the lower part of the lifting plate 53, and is used to limit the lifting plate 53 from moving downward to the lowest position, so as to ensure that when the lifting plate 53 reaches the lowest position, the pressing plate 6 can block the middle cover opening of the battery box A. A first buffer structure 15 is provided between the first limit block 14 and the lower end of the lifting plate 53, and the first buffer structure 15 can reduce the impact of the lifting plate 53 on the first limit block 14 when it moves to the extreme position, so as to avoid a hard collision between the two, thereby ensuring the feasibility and safety of the device, and on the other hand, optimizing the pressing impact force of the pressing plate 6 on the middle cover opening, so as to avoid deformation of the middle cover.

[0055] Further, such as Figure 7As shown, the first buffer structure 15 includes an elastic component 15c and a connecting column 15a vertically penetrating the thickness direction of the first limit block 14, wherein the connecting column 15a can move up and down relative to the first limit block 14. A cap 15b is provided at the upper end of the connecting column 15a, and the cross-sectional area of ​​the cap 15b is larger than the cross-sectional area of ​​the connecting column 15a. The elastic component 15c is sleeved on the connecting column 15a, one end of the elastic component 15c abuts against the lower surface of the cap 15b, and the other end abuts against the upper surface of the first limit block 14. When the lifting plate 53 moves downward to the limit position, the lower end of the lifting plate 53 abuts against the cap 15b. At this time, the lifting plate 53 can overcome the pressure of the elastic component 15c and compress the elastic component 15c downward. When the lifting plate 53 moves upward away from the connecting column 15a, the elastic component 15c can release the upward force to reset the connecting column 15a.

[0056] Furthermore, if Figure 2 and 3 As shown, a transfer support frame 16 is provided on one side of the lifting plate 53 opposite to the pressing plate 6, the transfer support frame 16 is perpendicular to the lifting plate 53 and extends outward, and the lower end of the transfer support frame 16 is fixedly connected to the upper end of the pressing plate 6. In this way, the connection between the pressing plate 6 and the lifting plate 53 can be made more stable.

[0057] Please refer to Figure 5 In this embodiment, there are two groups of columns 42, which are respectively arranged at the two ends of the width direction of the supporting bottom plate 41, and the second cylinder 51 is arranged between the two groups of columns 42. The two ends of the lifting plate 53 in the width direction are respectively slidably connected with the two groups of columns 42, and the first connecting seat 54 is located in the middle of the side of the lifting plate 53 opposite to the second cylinder 51. Such a design improves the stability of the operation of the lifting drive mechanism 5.

[0058] Re-attend Fig.10 and 14 , the substrate 2 is suspended and fixed on the support base 1 through a support column, and the horizontal driving mechanism 9 includes a fourth cylinder 91 horizontally mounted on the support base 1, and a fourth piston rod 92 that can be telescoped back and forth in the fourth cylinder 91. The fourth cylinder 91 is located below the substrate 2, and the rear end of the fourth piston rod 92 is connected to the support base 41. The rear part of the support base 1 is provided with a second guide rail 93 extending in its horizontal direction, and the support base 41 is slidably connected to the second guide rail 93 through a second slider 92. The fourth piston rod 92 can drive the support base 41 to move forward and backward by telescopic movement. In this embodiment, the connection between the end of the fourth piston rod 92 and the support base 41 is a rotation connection, and its principle and structure are the same as the rotation connection between the second piston rod 52 and the lifting plate 53 mentioned above. By connecting in this way, the parallelism error between the fourth piston rod 92 and the support base 41 can be eliminated, and the smoothness of the movement of the horizontal driving mechanism 9 is ensured.

[0059] Further, refer to Fig.14 , a second limit block 1b is provided on the support base 1, and the second limit block 1b can limit the distance that the support base plate 41 slides forward. When the support base plate 41 abuts against the second limit block 1b, the pressure plate 6 is directly opposite to the upper opening of the cover of the battery box A. In this embodiment, a second buffer structure 17 is provided at one end of the second limit block 1b relative to the support base plate 41, and the second buffer structure 17 can reduce the impact of the support base plate 41 on the second limit block 1b when it moves to the front end limit position, thereby avoiding a hard collision between the two and ensuring the feasibility and safety of the device. The specific implementation of the second buffer structure 17 is as follows:

[0060] The second buffer structure 17 includes an elastic sheet 171, one end of which is rotatably connected to the second limit block 1b, and the other end of which is rotatably mounted with an elastic roller 172 toward one side of the support base plate 41. A buffer column 173 is provided between the elastic sheet 171 and the second limit block 1b.

[0061] Please refer to Fig.10 and 12 The inner locking mechanism includes an inner buckle connecting rod assembly 8 distributed below the pressure plate 6, and a second pressure block 8a is assembled at the outer end of the inner buckle connecting rod assembly 8. A driving mechanism 7 is installed on the pressure plate 6. The driving mechanism 7 is used to control the movement of the inner buckle connecting rod assembly 8 so that the second pressure block 8a can press the lower surface of the thin edge structure A1 of the middle cover opening upward or move downward away from the lower surface of the thin edge structure A1 of the middle cover opening. After the pressure plate 6 is pressed on the middle cover opening, the driving mechanism 7 drives the inner buckle connecting rod assembly 8 to drive the second pressure block 8a to press upward against the lower surface of the thin edge structure A1 to form an upward support for the thin edge structure A1; after the detection is completed, the driving mechanism 7 drives the inner buckle connecting rod assembly 8 to drive the second pressure block 8a to move downward away from the lower surface of the thin edge structure A1 and fold inward, so as to facilitate the pressure plate 6 to move upward away from the middle cover opening.

[0062] Re-attend Figure 6 and Fig.12 The driving mechanism 7 includes a third cylinder body 71 fixed above the pressing plate 6 and a third piston rod 72 that can move up and down relative to the third cylinder body 71. The third piston rod 72 penetrates the pressing plate 6 downward and extends downward. The third piston rod 72 is slidably connected with the pressing plate 6. In this embodiment, the mounting frame 10 is fixed on the adapter support frame 16, and the third cylinder body 71 is fixedly assembled on the lower side of the mounting frame 10. Fig.11It can be seen that the lower end of the third piston rod 72 is fixedly connected with a linkage seat 73, and the linkage seat 73 is rotatably connected to the inner buckle connecting rod assembly 8 through a linkage piece 74. The third piston rod 72 drives the linkage seat 73 to move downward, and under the linkage action of the linkage piece 74 and the inner buckle connecting rod assembly 8, it can drive the second pressing block 8a to rotate upward to the lower surface of the thin-edge structure A1; the third piston rod 72 drives the linkage seat 73 to move upward, and under the linkage action of the linkage piece 74 and the inner buckle connecting rod assembly 8, it can drive the second pressing block 8a downward away from the lower surface of the thin-edge structure A1 and retract to below the pressure plate 6.

[0063] like Fig.11 As shown, the inner buckle connecting rod assembly 8 includes an articulated seat 81 fixed on the lower side of the pressure plate 6, and a first connecting rod 82, a second connecting rod 83, and a third connecting rod 84 which are articulated in sequence, wherein the ends of the first connecting rod 82 and the third connecting rod 84 away from the second connecting rod 83 are both articulated on the articulated seat 81, that is, the upper ends of the first connecting rod 82 and the upper ends of the third connecting rod 84 are respectively articulated on the two ends of the articulated seat 81, and the articulated seat 81, the first connecting rod 82, the second connecting rod 83, and the third connecting rod 84 constitute a four-bar linkage. The third connecting rod 84 is provided with an extension portion 85 extending outward, and the second pressing block 8a is fixedly connected to the extension portion 85. One end of the linkage sheet 74 is articulated with the linkage seat 73, and the other end is articulated with the end of the first connecting rod 82 away from the articulated seat 81. In this embodiment, the first connecting rod 82 and the second connecting rod 83 are both arc-shaped structures that bend outward. The linkage seat 73 moves downward, and under the linkage of the linkage plate 74 and the four-bar mechanism, it can drive the second pressure block 8a to rotate from bottom to top in an inward-locking manner to the lower surface of the thin-edge structure A1; the linkage seat 73 moves upward, and under the linkage of the linkage plate 74 and the four-bar mechanism, it can drive the second pressure block 8a to move inwardly away from the lower surface of the thin-edge structure A1 first downward and then fold upward to the initial position, and the movement trajectory of the second pressure block 8a is an arc line.

[0064] Further, such as Fig.12 and 13 As shown, a flange support plate 75 is fixedly sleeved in the middle of the third piston rod 72, and a limit plate 76 is provided at a position corresponding to the flange support plate 75 on the pressure plate 6, and the limit plate 76 can limit the downward sliding distance of the third piston rod 72. When the flange support plate 75 abuts against the limit plate 76, the second pressure block 8a can be supported on the lower surface of the thin edge structure A1.

[0065] Please refer to Fig.13, an annular sealing sleeve 18 is provided on the upper side of the sliding hole through which the third piston rod 72 passes through the pressing plate 6, and a sealing groove 751 adapted to the upper structure of the annular sealing sleeve 18 is provided on the lower side of the flange support plate 75. When the flange support plate 75 abuts against the limiting plate 76, the upper end of the annular sealing sleeve 18 abuts upwards in the sealing groove 751, ensuring the sealing of the pressing plate 6. A sealing rubber ring 19 is provided between the limiting plate 76 and the pressing plate 6, ensuring that there is no gap between the limiting plate 76 and the pressing plate 6, thereby ensuring the sealing effect of the pressing plate 6.

[0066] Re-attend Fig.13 The lower end of the third piston rod 72 is fixedly connected to the linkage seat 73 through a driving plate 77. The linkage seat 73 is fixedly assembled on the lower side of the driving plate 77. The third piston rod 72 drives the driving plate 77 to move up and down, which can drive the linkage seat 73 to move up and down. In this embodiment, in order to ensure the stability of the structure and the lower surface of the thin-edge structure A1 can be evenly supported, multiple groups of linkage seats 73 are distributed along the circumferential direction on the lower side of the driving plate 77, and the inner connecting rod assembly 8 corresponds to the linkage seat 73. In this way, the lower surface of the thin-edge structure A1 can be evenly supported. In this embodiment, multiple groups of driving mechanisms 7 can be set on the pressure plate 6 to ensure the stability of its operation.

[0067] like Fig.11 As shown, a guide column 20 extending vertically downward is distributed on the lower side of the pressing plate 6, and the guide column 20 runs through the thickness direction of the driving plate 77, and the driving plate 77 can slide up and down along the guide column 20. The guide column 20 plays a guiding role to ensure that the driving plate 77 always moves in the vertical direction.

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A CTC structure air tightness detection tool for a new energy vehicle power battery box, characterized in that: include: A support base (1), wherein a base plate (2) is provided on the support base (1), and a first sealing ring (2a) for sealing an opening of a battery box body is fixedly provided on the base plate (2); A first pressing mechanism (3) disposed on the base plate (2) and used to press the main body opening at the lower end of the battery box onto the first sealing ring (2a); A stand (4) is slidably mounted on a support base (1) in a horizontal direction, and a horizontal driving mechanism (9) is provided on the support base (1) for controlling the stand (4) to slide in the length direction of the support base (1); a pressing plate (6) is slidably connected to the stand (4) in an upward and downward manner, and a lifting driving mechanism (5) for controlling the upward and downward movement of the pressing plate (6) is installed on the stand (4); A second sealing ring (6a) is fixedly provided on the lower side of the pressing plate (6); the lifting drive mechanism (5) drives the pressing plate (6) to move downward, so that the second sealing ring (6a) can be sealed on the upper surface of the open thin-edge structure of the middle cover; an inner locking mechanism is installed on the pressing plate (6); the inner locking mechanism has a second pressing block (8a) located below the pressing plate (6); when the second sealing ring (6a) is sealed on the upper surface of the open thin-edge structure of the middle cover, the inner locking mechanism can press the second pressing block (8a) upward against the lower surface of the open thin-edge structure of the middle cover.

2. The CTC structure airtightness detection tool for the power battery box of a new energy vehicle according to claim 1 is characterized in that: The first clamping mechanism (3) comprises a first cylinder assembly (31) distributed on the circumferential edge of the base plate (2), the first cylinder assembly (31) comprising a first cylinder body (311) and a first piston rod (312), the first piston rod (312) being able to extend and retract up and down in the first cylinder body (311) and being able to rotate relative to the first cylinder body (311), and a third pressure block (32) being provided at the end of the first piston rod (312).

3. The CTC structure airtightness detection tool for the new energy vehicle power battery box according to claim 1 is characterized in that: The stand (4) comprises a supporting base plate (41) and a column (42) fixedly mounted on the supporting base plate (41); the lifting drive mechanism (5) comprises a second cylinder body (51) fixedly mounted on the supporting base plate (41) and a second piston rod (52) extending upward and downward in the second cylinder body (51); a lifting plate (53) is connected to the upper part of the second piston rod (52); the lifting plate (53) is slidably connected to the column (42); the pressing plate (6) is fixedly connected to the lifting plate (53); the second piston rod (52) can drive the pressing plate (6) to move downward when it moves downward.

4. The CTC structure airtightness detection tool for the new energy vehicle power battery box according to claim 3 is characterized in that: The lifting plate (53) is provided with a first connecting seat (54), and the upper part of the second piston rod (52) is provided with a connecting through hole (521), and the connecting through hole (521) is rotatably connected to the first connecting seat (54) via a rotating shaft (a).

5. The CTC structure airtightness detection tool for the power battery box of a new energy vehicle according to claim 4 is characterized in that: A bearing (55) is provided between the connecting through hole (521) and the rotating shaft (a), and the connecting through hole (521) and the bearing (55) are rotatably connected in a ball joint manner.

6. The CTC structure airtightness detection tool for the new energy vehicle power battery box according to claim 1, characterized in that: The inner locking mechanism comprises an inner buckle connecting rod assembly (8) arranged below the pressure plate (6); the second pressure block (8a) is assembled on the outer end of the inner buckle connecting rod assembly (8); a driving mechanism (7) is installed on the pressure plate (6); the driving mechanism (7) is used to control the movement of the inner buckle connecting rod assembly (8) so that the second pressure block (8a) can press upward against the lower surface of the open thin-edge structure of the middle cover or move downward away from the lower surface of the open thin-edge structure of the middle cover.

7. The CTC structure airtightness detection tool for the new energy vehicle power battery box according to claim 6 is characterized in that: The driving mechanism (7) comprises a third cylinder body (71) fixed above the pressure plate (6) and a third piston rod (72) capable of telescopic movement relative to the third cylinder body (71); the third piston rod (72) penetrates downward through the pressure plate (6) and extends downward; a linkage seat (73) is fixedly connected to the lower end of the third piston rod (72); the linkage seat (73) is rotatably connected to the inner buckle connecting rod assembly (8) via a linkage plate (74); The linkage seat (73) moves downward, and under the linkage action of the linkage piece (74) and the inner buckle connecting rod assembly (8), it can drive the second pressing block (8a) to rotate upward to the lower surface of the open thin edge structure of the middle cover; The linkage seat (73) moves upwards, and under the linkage action of the linkage piece (74) and the inner buckle connecting rod assembly (8), it can drive the second pressing block (8a) downward away from the lower surface of the open thin edge structure of the middle cover and retract it to below the pressing plate (6).

8. The CTC structure airtightness detection tool for the power battery box of a new energy vehicle according to claim 7, characterized in that: The inner buckle connecting rod assembly (8) includes an articulated seat (81) fixedly arranged on the lower side of the pressure plate (6), and a first connecting rod (82), a second connecting rod (83), and a third connecting rod (84) which are articulated in sequence, wherein the ends of the first connecting rod (82) and the third connecting rod (84) away from the second connecting rod (83) are both articulated on the articulated seat (81), and the articulated seat (81), the first connecting rod (82), the second connecting rod (83), and the third connecting rod (84) form a four-bar linkage mechanism, and the third connecting rod (84) is provided with an extension portion (85) extending outward, and the second pressure block (8a) is fixedly connected to the extension portion (85), and one end of the linkage plate (74) is articulated to the linkage seat (73), and the other end is articulated to the end of the first connecting rod (82) away from the articulated seat (81).

9. The CTC structure airtightness detection tool for the new energy vehicle power battery box according to claim 7, characterized in that: A flange support plate (75) is fixedly mounted in the middle of the third piston rod (72), and a limit plate (76) is provided on the pressure plate (6) at a position corresponding to the flange support plate (75). The limit plate (76) is used to limit the downward sliding distance of the third piston rod (72).

10. The CTC structure airtightness detection tool for the power battery box of a new energy vehicle according to claim 1, characterized in that: It also includes a supporting crossbeam (11) which is arranged on the upper part of the battery box body. A second pressing mechanism (12) is provided on the base plate (2). The second pressing mechanism (12) is used to press the supporting crossbeam (11) downward onto the upper part of the battery box body.

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