Cover plate pressing tool and welding device

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate pressing and abutting tool and a welding device.The cover plate pressing and abutting tool comprises a fixed block, a movable block and an elastic piece, and the movable block is arranged on the side, close to a cover plate, of the fixed block; one end of the elastic piece is connected with the fixed block, the other end of the elastic piece is connected with the movable block, and the elastic piece can enable the movable block to be close to / away from the fixed block in the preset direction through elastic deformation so that the movable block can abut against the cover plate. According to the cover plate pressing and abutting tool, the cover plate can overcome rebound force generated by initial pressing and bending under the elastic force action of the elastic piece, so that it is guaranteed that the cover plate and the end of the battery cell shell can be mutually pressed in the period from feeding to final pressing, the cover plate cannot be bounced off from the end of the battery cell shell due to the rebound force, displacement is avoided, and the service life of the battery cell shell is prolonged. Therefore, the situation that the relative positions of the cover plate and the battery cell deviate when the battery cell is subjected to final pressing, and consequently the battery cell shell is crushed is avoided, the press-fitting yield of the cover plate and the battery cell shell is increased, and the rejection rate of the battery cell is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to a cover pressing tooling and a welding device. Background Art

[0002] In the existing welding process for the cover of a short-knife battery cell, after the cover is bent, the cover is first loaded onto the cell fixing platform. After the cell is loaded onto the cell fixing platform, the cell fixing platform is then moved forward to perform final pressing on the cell, and finally, the welding of the four sides of the cover to the connection part of the cell shell opening is completed.

[0003] The existing pressing mechanism is a fixed pressing type. After the cell is loaded, the cover cannot make full and effective contact with the pressing mechanism. Due to the rebound force of the bent cover, the cover will bounce off the shell opening of the cell shell for the second time under the action of the bending rebound force. This causes the relative position of the cover and the shell opening to shift during the final pressing of the cell, resulting in the shell opening of the cell shell being damaged and the cell being scrapped. Utility Model Content

[0004] This application provides a cover pressing tooling and a welding device to solve the problem that the cover cannot make full contact with the pressing mechanism after the cell is loaded, resulting in damage to the shell opening of the cell in the prior art.

[0005] On the one hand, this application provides a cover pressing tooling, including:

[0006] A fixed block;

[0007] A movable block, arranged on the side of the fixed block close to the cover;

[0008] An elastic member, with one end connected to the fixed block and the other end connected to the movable block. The elastic member can make the movable block approach / away from the fixed block along a preset direction through elastic deformation so that the movable block remains in contact with the cover.

[0009] In a possible design, the cover pressing tooling further includes a limit post, which is arranged on the side of the fixed block close to the movable block. The limit post abuts against the cover to prevent the movable block from continuing to approach the fixed block along the preset direction.

[0010] In a possible design, a first adjustment hole is formed on the fixed block, and at least part of the limit post is threadedly connected to the inner wall of the first adjustment hole, and at least part of the limit post extends out of the first adjustment hole.

[0011] In a possible design, a protective sleeve is sleeved on the part of the limit post extending out of the first adjustment hole.

[0012] In a possible design, the elastic member includes:

[0013] A guide column, one end of which is connected to the fixed block, the other end of which is provided with a blocking block, and the outer wall of the guide column is slidably connected to the movable block;

[0014] The spring is sleeved on the guide column, one end of the spring abuts against the fixed block, and the other end abuts against the movable block. The spring elastically deforms to enable the movable block to move between the fixed block and the blocking block along the axial direction of the guide column.

[0015] In a possible design, a second adjustment hole is opened on the fixing block, at least a portion of the guide column is threadedly connected to an inner wall of the second adjustment hole, and at least a portion of the guide column extends out of the second adjustment hole.

[0016] In a possible design, a countersunk hole is provided on a side of the movable block away from the fixed block, and the blocking block is arranged in the countersunk hole.

[0017] In a possible design, a first limiting groove is provided on the fixed block, a second limiting groove is provided on the movable block, the first limiting groove and the second limiting groove are arranged opposite to each other, and two ends of the spring are respectively arranged in the first limiting groove and the second limiting groove.

[0018] In a possible design, a guide groove is provided on the fixed block, the movable block is arranged in the guide groove, and the movable block moves along a preset direction by slidingly cooperating with the inner wall of the guide groove.

[0019] On the other hand, the present application also provides a welding device, including the cover plate pressing tool as described above.

[0020] The beneficial effects of this application are as follows:

[0021] The cover plate pressing tool of the present application comprises a fixed block, a movable block and an elastic member, wherein the two ends of the elastic member are respectively connected to the fixed block and the movable block, and the elastic member generates elastic deformation to make the movable block approach / move away from the fixed block in a preset direction so that the movable block and the cover plate (the cover plate loaded onto the battery cell fixed platform) are kept in contact, thereby making the cover plate and the movable block always maintain elastic contact, and the cover plate can overcome the rebound force generated by the initial pressure bending under the elastic force of the elastic member, thereby ensuring that during the period from loading to final pressing, the cover plate and the end of the battery cell housing can be pressed against each other, and the cover plate will not bounce off the end of the battery cell housing due to the rebound force to cause displacement, so that the cover plate and the end of the battery cell housing maintain a precise relative position relationship, thereby avoiding the relative position of the cover plate and the battery cell housing being offset during the final pressing of the battery cell, resulting in the end of the battery cell housing being crushed, thereby improving the pressing yield of the cover plate and the battery cell housing, and reducing the scrap rate of the battery cell.

[0022] The welding device provided in the present application includes the cover plate pressing tooling in the present application, and therefore also includes all the above-mentioned advantages of the cover plate pressing tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the cover pressing tooling provided by the embodiment of the present application;

[0025] Figure 2 Structural schematic of the welding device provided by the embodiment of the present application Figure 1 ;

[0026] Figure 3 Structural schematic of the welding device provided by the embodiment of the present application Figure 2 ;

[0027] Figure 4 Front view of the welding device provided by the embodiment of the present application;

[0028] Figure 5 Side view of the welding device provided by the embodiment of the present application.

[0029] Reference numerals:

[0030] 100, fixed block; 110, first adjustment hole; 120, second adjustment hole; 130, first limit groove; 140, guide groove; 200, movable block; 210, counterbore; 220, second limit groove; 300, elastic member; 310, guide post; 320, spring; 400, limit post; 500, protective sleeve; 610, fixed bracket; 620, rotary table; 630, connecting frame; 640, battery cell fixing platform; 650, side positioning cylinder; 660, large surface positioning cylinder. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions of the present application in combination with the embodiments. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0032] After the cover plate is bent, it is fed onto the battery cell fixing platform 640. Due to the bending, the cover plate has a rebound phenomenon. The existing pressing mechanism is a fixed structure, so it is difficult to directly and fully contact the pressing mechanism when the battery cell is fed onto the fixing platform. Therefore, there is a secondary springing open phenomenon between the cover plate and the shell opening. The cover plate pressing tooling of the present application is provided with an elastic member 300. The elastic force of the elastic member 300 on the cover plate can overcome the rebound force of the cover plate, so that the cover plate and the shell opening always remain in mutual contact.

[0033] The following will describe the cover plate pressing tooling provided in the embodiments of the present application in conjunction with Figures 1-5 to describe the cover plate pressing tooling provided in the embodiments of the present application.

[0034] Referring to Figure 1 As shown, in the embodiment provided by the present application, the cover plate pressing tooling includes a fixed block 100, a movable block 200, and an elastic member 300. The movable block 200 is arranged on the side of the fixed block 100 close to the cover plate; one end of the elastic member 300 is connected to the fixed block 100, and the other end of the elastic member 300 is connected to the movable block 200. The elastic member 300 can make the movable block 200 approach / away from the fixed block 100 along a preset direction through elastic deformation so that the movable block 200 remains in contact with the cover plate.

[0035] By using the technical solution provided by the above embodiment, the elastic member 300 generates elastic deformation to make the movable block 200 approach / away from the fixed block 100 along a preset direction so that the movable block 200 remains in contact with the cover plate (the cover plate fed onto the battery cell fixing platform 640), so that there is always elastic contact between the cover plate and the movable block 200. Under the elastic force of the elastic member 300, the cover plate can overcome its own rebound force generated by initial pressing and bending. Furthermore, it is ensured that during the period from feeding to final pressing, the cover plate and the end of the battery cell housing can be mutually pressed tightly, and the cover plate will not be sprung open from the end of the battery cell housing due to the rebound force and cause displacement, so that the cover plate and the end of the battery cell housing maintain an accurate relative position relationship, thereby avoiding the relative position between the cover plate and the battery cell housing from shifting during final pressing and causing the end of the battery cell housing to be damaged, improving the pressing yield of the cover plate and the battery cell housing, and reducing the scrap rate of the battery cell.

[0036] Referring to Figure 1As shown, in some embodiments provided by the present application, the elastic member 300 includes a guide post 310 and a spring 320. One end of the guide post 310 is connected to the fixed block 100, and the other end of the guide post 310 has a blocking block. The outer wall of the guide post 310 is slidably connected to the movable block 200; the spring 320 is sleeved on the guide post 310. One end of the spring 320 abuts against the fixed block 100, and the other end abuts against the movable block 200. The spring 320 causes the movable block 200 to move between the fixed block 100 and the blocking block along the axial direction of the guide post 310 through elastic deformation. By providing the guide post 310 and the spring 320, the movable block 200 can move along the axial direction of the guide post 310 under the elastic force of the spring 320, so that the movable block 200 always remains in contact with the cover plate. In some specific embodiments, a guide hole is correspondingly provided on the movable block 200, and the outer wall of the guide post 310 is slidably matched with the inner wall of the guide hole, so that the movable block 200 can slide along the axial direction of the guide post 310 between the fixed block 100 and the blocking block. A counterbore 210 is provided on the side of the movable block 200 away from the fixed block 100, and the counterbore 210 is coaxially arranged with the guide hole. The blocking block is arranged in the counterbore 210. In this way, it is possible to prevent the blocking block from protruding from the surface of the movable block 200 and damaging the cover plate. In some specific embodiments, a first limiting groove 130 is formed on the fixed block 100, and a second limiting groove 220 is formed on the movable block 200. The first limiting groove 130 and the second limiting groove 220 are arranged opposite to each other, and both ends of the spring 320 are respectively arranged in the first limiting groove 130 and the second limiting groove 220. In this way, through the first limiting groove 130 and the second limiting groove 220, the spring 320 can be limited to prevent the spring 320 from shifting. In some specific embodiments, a guide groove 140 is formed on the fixed block 100, and the movable block 200 is arranged in the guide groove 140. The movable block 200 moves along a preset direction by slidingly cooperating with the inner wall of the guide groove 140. Specifically, the inner wall of the guide groove 140 is consistent with the axial direction of the guide post 310. By providing the guide groove 140, it is beneficial to make the movable block 200 move more smoothly under the elastic force of the spring 320.

[0037] It should be noted that an appropriate spring 320 can be selected according to the magnitude of the rebound force of the cover plate. Specifically, the formula F = kX is used; where F is the rebound force (which can be obtained through experiments), k is the spring constant of the spring 320, and X is the compression amount of the spring 320; in this way, the extension amount of the movable block 200 can be accurately calculated, and then a spring 320 with an appropriate spring constant can be selected to precisely and quantitatively adjust the cover plate pressing tooling.

[0038] Refer to Figure 1As shown, in some embodiments provided by the present application, a second adjustment hole 120 is formed in the fixed block 100, at least a part of the guide post 310 is threadedly connected to the inner wall of the second adjustment hole 120, and at least a part of the guide post 310 extends out of the second adjustment hole 120. In this way, by screwing the guide post 310, the length of the guide post 310 extending out of the second adjustment hole 120 can be changed, so as to adjust the distance between the movable block 200 and the fixed block 100, so as to facilitate adjusting the protrusion amount of the movable block 200 relative to the fixed block 100 according to the cell loading position.

[0039] Referring to Figure 1 As shown, in some embodiments provided by the present application, the cover pressing tooling further includes a limit post 400. The limit post 400 is disposed on the side of the fixed block 100 close to the movable block. The limit post 400 abuts against the cover to prevent the movable block 200 from continuing to approach the fixed block 100 along a preset direction. Specifically, the limit post 400 is threadedly connected, pinned or clamped to the fixed block 100, etc.; in the natural state of the spring 320, the side of the movable block 200 close to the cover protrudes from the limit post 400, that is, after the cover is loaded onto the cell fixing platform 640, the cover abuts against the movable block 200 by pressing the spring 320, but at this time, there is no contact between the cover and the limit post 400; in the final pressing stage, when the cell fixing platform 640 moves closer to the fixed block 100 and the spring 320 continues to be compressed, the cover contacts and abuts against the limit post 400 to achieve final pressing. In this way, during the period from the cover loading to the final pressing, the cover and the end of the cell housing can be tightly pressed against each other, and the cover will not bounce off from the end of the cell housing due to the rebound force and cause displacement, so that the cover and the end of the cell housing maintain an accurate relative position relationship, thereby avoiding the relative position of the cover and the cell housing shifting during the final pressing of the cell, which may cause the end of the cell housing to be damaged, improving the pressing yield of the cover and the cell housing, and reducing the scrap rate of the cell.

[0040] Referring to Figure 1As shown, in some embodiments provided by the present application, a first adjustment hole 110 is formed in the fixed block 100. At least a part of the limit post 400 is threadedly connected to the inner wall of the first adjustment hole 110, and at least a part of the limit post 400 extends out of the first adjustment hole 110. Specifically, the first adjustment hole 110 includes two hole segments with different diameters, namely a large hole segment and a small hole segment. An internal thread is provided on the inner wall of the small hole segment. The limit post 400 is a screw rod, and an external thread is provided on the outer wall of the limit post 400. The outer wall of the limit post 400 is threadedly connected to the inner wall of the small hole segment; the end of the limit post 400 is slidably matched with the inner wall of the large hole segment. By screwing the limit post 400, the position of the end of the limit post 400 in the large hole segment is changed, so that the length of the limit post 400 extending out of the first adjustment hole 110 can be adjusted, and thus the length of the limit post 400 extending out of the first adjustment hole 110 can be adjusted according to the position of the battery cell feeding. In some specific embodiments, a protective sleeve 500 is sleeved on the part of the limit post 400 extending out of the first adjustment hole 110. The function of the protective sleeve 500 is to prevent the limit post 400 from scratching the cover plate.

[0041] In the embodiments of the present application, a welding device is further provided, including the cover plate pressing tooling in the above embodiments.

[0042] Referring to Figures 2-5 As shown, the welding device includes a fixed bracket 610, a rotary table 620, a connecting frame 630, and a battery cell fixing platform 640. The rotary table 620 is installed on the fixed bracket 610. The connecting frame 630 is installed on one side of the rotary table 620. The battery cell fixing platform 640 is installed on the other side of the rotary table 620. The cover plate pressing tooling is installed on the connecting frame 630. In this way, the cover plate pressing tooling and the battery cell fixing platform 640 are arranged opposite to each other. The battery cell fixing platform 640 can approach or move away from the cover plate pressing tooling under the drive of the motor to perform final pressing between the cover plate and the battery cell housing; the rotary table 620 can drive the connecting frame 630 and the battery cell fixing platform 640 to rotate synchronously, so that the cover plate pressing tooling and the battery cell fixing platform 640 rotate synchronously, so as to perform four-sided welding on the connection between the cover plate and the battery cell housing.

[0043] The working process of the welding device of the present application:

[0044] After the cover plate is bent and pre-pressed, the gripper feeds the material onto the battery cell fixing platform 640, and the battery cell is sent to the predetermined position, so that the movable block 200 is in full contact with the cover plate, and at the same time the spring 320 is compressed to ensure that the cover plate abuts against the mouth of the battery cell housing after the gripper withdraws;

[0045] After the side positioning cylinder 650 extends out, the large surface positioning cylinder 660 extends and presses down in place. The battery cell fixing platform 640 moves forward, and the battery cell is finally pressed to compress the spring 320 for the second time. The cover plate contacts the limit post 400 to complete the precise positioning of the cover plate and the housing;

[0046] The rotary table 620 rotates automatically to complete the welding of the four sides of the cover plate.

[0047] It should be noted that the welding device includes a cover plate pressing tooling, which incorporates all the above-mentioned advantages of the cover plate pressing tooling, and will not be elaborated here.

[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0050] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0052] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A cover pressing tooling, characterized in that, Comprising: Fixed block; Movable block, arranged on one side of the fixed block close to the cover plate; Elastic member, one end connected to the fixed block and the other end connected to the movable block, and the elastic member can make the movable block approach / away from the fixed block along a preset direction through elastic deformation so that the movable block remains in contact with the cover plate.

2. The cover pressing tool according to claim 1, characterized in that: Further comprising a limit post, the limit post is arranged on one side of the fixed block close to the movable block, and the limit post abuts against the cover plate to prevent the movable block from continuing to approach the fixed block along the preset direction.

3. The cover pressing tool according to claim 2, wherein: A first adjustment hole is formed in the fixed block, at least part of the limit post is threadedly connected to the inner wall of the first adjustment hole, and at least part of the limit post extends out of the first adjustment hole.

4. The cover pressing tool according to claim 3, characterized in that: A protective sleeve is sleeved on the part of the limit post extending out of the first adjustment hole.

5. The cover plate pressing tool according to any one of claims 1-4, characterized in that: The elastic member includes: Guide post, one end connected to the fixed block, the other end of the guide post has a blocking block, and the outer wall of the guide post is slidably connected to the movable block; Spring, sleeved on the guide post, one end of the spring abuts against the fixed block and the other end abuts against the movable block, and the spring makes the movable block move between the fixed block and the blocking block along the axial direction of the guide post through elastic deformation.

6. The cover pressing tool according to claim 5, characterized in that: A second adjustment hole is formed in the fixed block, at least part of the guide post is threadedly connected to the inner wall of the second adjustment hole, and at least part of the guide post extends out of the second adjustment hole.

7. The cover pressing tool according to claim 5, characterized in that: A counterbore is arranged on the side of the movable block away from the fixed block, and the blocking block is arranged in the counterbore.

8. The cover pressing tool according to claim 5, characterized in that: A first limit groove is formed in the fixed block, a second limit groove is formed in the movable block, the first limit groove and the second limit groove are arranged oppositely, and two ends of the spring are respectively arranged in the first limit groove and the second limit groove.

9. The cover pressing tool according to claim 1, characterized in that: A guide groove is formed in the fixed block, the movable block is arranged in the guide groove, and the movable block moves along the preset direction by sliding cooperation with the inner wall of the guide groove.

10. A welding device, characterized in that: Comprising the cover plate pressing tooling according to any one of claims 1-9.

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