A spin riveting structure power battery cover plate production tool

Abstract

The application provides a spin riveting structure power battery cover plate production tool, relates to the lithium battery cover plate production technical field, and the terminal support insert block comprises a metal insert block and an insert block cover cap, the material of the insert block cover cap is PEEK, and the insert block cover cap is sleeved with the metal insert block; the mounting seat is provided with a mounting groove, two terminal support insert blocks are mounted in the mounting groove, and the upper end position of the insert block cover cap is not higher than the upper end position of the mounting seat. Through the cooperation of the mounting seat and the terminal support insert block and the split structure of the terminal support insert block, the insert block cover cap made of PEEK only plays the role of buffering and protecting the working surface and no longer undertakes the main compression task. The metal insert block provides almost zero compression deformation, and even if used for a long time, the local micro-deformation of the insert block cover cap made of PEEK will not cause the sinking of the terminal support surface or the central depression, so that the long-term stability of the terminal support reference surface in the spin riveting process is maintained.

Description

Technical Field

[0001] This invention relates to the field of lithium battery cover manufacturing technology, and more specifically, to a riveting structure power battery cover manufacturing tooling. Background Technology

[0002] In the field of power batteries, the sealing and fixing of the power battery cover and the terminal post is generally achieved by riveting. That is, by rotating and pressing down the riveting head, the metal at the upper end of the terminal post is plastically flanged, and a one-piece sealing and locking structure is formed by permanent metal deformation. Because there is no heat damage from high-temperature welding, the riveting process does not produce metal debris. After riveting, it is resistant to high and low temperatures and alternating air pressure. Therefore, it is widely used due to its advantages of simple process and strong structural reliability.

[0003] However, due to the special structure of the power battery cover, riveting fixtures are required during riveting production. Existing riveting fixtures are all designed to fit the shape of the power battery cover to provide stable support and restrict the rotation of the terminal post. Riveting fixtures are usually made of metal or PEEK (polyether ether ketone resin). Metal riveting fixtures are prone to causing appearance problems such as trimming of the terminal post skirt, bottom indentation, and scratches during riveting. On the other hand, riveting fixtures made entirely of PEEK material are prone to causing performance problems such as cover sealing failure and air leakage, internal resistance exceeding the upper limit, and unqualified compression. The specific reasons are as follows: (a) Cover plate appearance problems: Direct pre-riveting after cover plate assembly causes cracking of terminal wall; due to the high rigidity of metal riveting fixtures, the riveting head directly contacts the cover plate during riveting, resulting in high impact, which causes appearance problems such as tearing, material sticking, wire cutting of the terminal skirt, bottom indentation and scratches on the pole.

[0004] (ii) Cover plate performance issues: Peek material riveting fixtures are prone to collapse under repeated impacts from the riveting head, which will cause the bottom of the cover plate pole to become airborne, resulting in batch performance issues such as compression, internal resistance, and helium detection. 1. Leakage due to cover plate seal failure: Riveting is used to rivet the cover plate to the surrounding poles or flange structure to form an airtight connection. When the stress area at the top of the base collapses, the downward rotation of the rivet head cannot generate uniform static pressure on the sealing ring between the cover plate and the pole, causing helium to leak in this loose area. 2. Internal resistance exceeding the upper limit: During riveting, it is necessary to ensure that the contact resistance between the cover plate and the surrounding assembly is below a certain threshold. The internal resistance of the cover plate is closely related to the contact pressure and contact area. The collapse of the base causes the riveting force to be unable to be fully and effectively transmitted to the contact surface of the cover plate assembly. Because the collapse of the base will reduce the actual contact area, the internal resistance exceeds the upper limit. 3. Compression exceeding the upper limit: After long-term use, the contact surface of the existing integral Peek base is prone to permanent plastic collapse. This collapse will change the force transmission path during the riveting process, causing uneven stress on the sealing ring, resulting in an abnormally large actual compression of some parts of the sealing ring that exceeds the specification limit.

[0005] Therefore, in order to improve the riveting quality of power battery cover plates, a riveting structure power battery cover plate production tooling is proposed. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems mentioned in the background art.

[0007] To address the above problems, this invention provides a riveted structure power battery cover manufacturing fixture, including a mounting base and a terminal support insert, wherein: The terminal support insert includes a metal insert and an insert cap. The insert cap is made of PEEK and is fitted onto the upper end of the metal insert. The mounting base has mounting grooves at the positions of the two terminals corresponding to the power battery cover. The upper end of the mounting base has a flat surface for supporting the power battery cover. The two terminal support inserts are installed in the mounting grooves, and the upper end of the insert cap is not higher than the upper end of the mounting base.

[0008] The present invention provides a riveting structure for the production of power battery cover plates, which, compared with the prior art, has the following beneficial effects, but is not limited to: Through the cooperation of the mounting base and terminal support insert, and the split structure of the terminal support insert, the Peek material insert cap only serves to buffer and protect the working surface, and no longer bears the main pressure resistance task. The metal insert provides almost zero compressive deformation. Even with long-term use, the local micro-deformation of the Peek material insert cap will not cause the terminal support surface to sink or the center to dent, maintaining the long-term stability of the terminal support reference surface during riveting.

[0009] Furthermore, the metal insert includes a first positioning platform and a second positioning platform, the second positioning platform being fixedly connected to the upper end of the first positioning platform, and the insert cap including a mating insert, the mating insert being sleeved onto the second positioning platform.

[0010] Furthermore, the upper end of the insert cap is provided with a recessed groove, the depth of which is 0.65-0.85mm.

[0011] Furthermore, the thickness of the bearing surface of the insert cap is 1.5-2.5mm.

[0012] Furthermore, it also includes a mounting block, which is installed into a mounting groove. The upper end of the mounting block has a first positioning groove. The insert cap also includes a mounting arm. The side wall of the mating insert is fixedly connected to the mounting arm. The mounting arm has a second mounting hole. The upper end of the mounting block has a second positioning groove corresponding to the position of the mounting arm. The second positioning groove has a mating hole corresponding to the position of the second mounting hole. The first positioning groove is used to mate with and connect to the first positioning platform, and the second positioning groove is used to mate with and connect to the mounting arm.

[0013] Furthermore, there is one mounting slot, two mounting blocks are installed in the same mounting slot, and the length of the mounting block is less than half the length of the mounting slot. A support block is also installed between the two mounting blocks, and the upper end of the support block is lower than the upper end of the mounting block.

[0014] Furthermore, the mounting block has a receiving hole.

[0015] Furthermore, a positioning block is detachably mounted on the mounting base. The positioning block is U-shaped and located on one side of the mounting groove.

[0016] Furthermore, the mounting base has a first mounting hole, which is used for mounting to the working platform of the riveting equipment.

[0017] Furthermore, it also includes a pre-riveting film, which is used to overlap the upper end of the terminal post of the power battery cover. Attached Figure Description

[0018] Figure 1 This is an isometric structural schematic diagram of a riveted power battery cover production fixture according to the present invention. Figure 2 This is a schematic diagram of the connection structure between the mounting block and the terminal support insert of the present invention; Figure 3 This is a schematic diagram of the terminal support insert of the present invention; Figure 4 This is a schematic diagram of the riveting operation of a riveting structure power battery cover production tooling according to the present invention. Figure 5 This is a top view schematic diagram of a riveting structure power battery cover production tooling according to the present invention. Figure 6 This is a schematic diagram showing the connection relationship between the positioning block and the mounting base of a riveted power battery cover production tooling according to the present invention. Figure 7 This is a schematic diagram of the pre-riveting process of a power battery cover production tooling with a riveting structure according to the present invention.

[0019] Explanation of reference numerals in the attached figures: 1-Mounting base, 11-Mounting groove, 12-First mounting hole, 13-Positioning block, 2-Mounting block, 21-First positioning groove, 22-Second positioning groove, 23-Matching hole, 24-Accommodation hole, 3-Terminal support insert, 31-Metal insert, 311-First positioning platform, 312-Second positioning platform, 32-Insert cap, 321-Matching insert, 322-Mounting arm, 323-Second mounting hole, 324-Counterpart, 4-Support block, 5-Pre-riveting film, 6-Battery cover, 7-Pre-riveting head, 8-Rotating head. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application are described clearly and completely below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," "comprise," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms, indicating that a method comprises one or more steps, or an apparatus comprises one or more elements, but do not exclude the inclusion of other steps or elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or primary / secondary relationship. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] See Figures 1-7 A riveted power battery cover production fixture according to an embodiment of the present invention includes a mounting base 1 and a terminal support insert 3, wherein: The terminal support insert 3 includes a metal insert 31 and an insert cap 32. The insert cap 32 is made of PEEK and is fitted onto the upper end of the metal insert 31. Mounting base 1 has mounting grooves 11 at the positions of the two poles of the power battery cover plate 6. The upper end of mounting base 1 has a flat surface for supporting the power battery cover plate 6. Two terminal support inserts 3 are installed in the mounting grooves 11. The upper end of the insert cap 32 is not higher than the upper end of mounting base 1.

[0026] In this embodiment, before riveting, the mounting base 1 is installed on the working platform of the riveting equipment, the metal insert 31 is installed on the mounting base 1 and the insert cap 32 is connected, the terminal of the power battery cover plate 6 is placed on the insert cap 32, the insert cap 32 should be provided with a mating surface of the corresponding terminal anti-rotation structure so that the terminal cannot rotate with the action of the riveting head 8 when it is placed on the insert cap 32.

[0027] Through the cooperation of mounting base 1 and terminal support insert 3, and the split structure of terminal support insert 3, the peek material insert cap 32 only serves as a buffer and protects the working surface, and no longer bears the main pressure resistance task. The metal insert 31 provides almost zero compressive deformation. Even with long-term use, the local micro-deformation of the peek material insert cap 32 will not cause the terminal support surface to sink or the center to dent, maintaining the long-term stability of the terminal support reference surface during riveting. This solves the problems caused by the collapse of the terminal support surface of the all-peek material riveting tool, frequent replacement of riveting tool on site, poor helium leak detection, internal resistance exceeding the upper limit, and poor compression of the tool. The Peek material insert cap 32 has its top surface in direct contact with the workpiece. The material has cushioning and low friction, and its hardness is much lower than that of metal. The bottom of the pole does not directly contact the metal. During riveting, the rivet head will not cause scratches or material sticking to the pole. It also eliminates problems such as pole skirt cutting, bottom indentation and abrasion. It solves the problem of damage to the workpiece surface caused by the high rigidity of the terminal support surface of metal riveting fixtures.

[0028] See Figures 1-7Optionally, the metal insert 31 includes a first positioning platform 311 and a second positioning platform 312. The second positioning platform 312 is fixedly connected to the upper end of the first positioning platform 311. The insert cap 32 includes a mating insert 321, which is fitted onto the second positioning platform 312.

[0029] In this embodiment, the second positioning platform 312 ensures that the metal insert 31 has sufficient support surface and support performance, while reducing the volume of the insert cap 32. This can effectively limit the deformation problem of the insert cap 32 during long-term use, and also play a role in the installation and positioning of the insert cap 32.

[0030] See Figures 1-7 Optionally, the upper end of the insert cap 32 is provided with a recess 324, the depth of which is 0.65-0.85mm.

[0031] In this embodiment, the distance between the lower end face of the terminal post and the stop bracket of the power battery cover 6 is generally 0.85mm. By limiting the depth of the recess 324, space is left for the sinking of the insert cap 32 due to material issues, compensating for the tolerance of PEEK material deformation and sinking over long-term use. In actual use, with the upper end of the side wall of the recess 324 flush with the top of the mounting base 1, the depth of the recess 324 should preferably be 0.7mm. The essence of this solution is to make the depth of the recess 324 less than the height between the stop bracket of the power battery cover 6 and the bottom of the terminal post, so as to leave room for sinking. It is advisable that the side wall of the recess 324 is flush with the top of the mounting base 1 to avoid leaving too much space for deformation.

[0032] See Figures 1-7 Optionally, the thickness of the bearing surface of the insert cap 32 is 1.5-2.5mm.

[0033] In this embodiment, the bearing surface of the insert cap 32 is the distance between the upper end of the second positioning platform 312 and the bottom of the sinker 324 after the metal insert 31 and the insert cap 32 are assembled. The smaller thickness structure design, compared with the 18.4mm (common) of the all-PEEK material riveting fixture, can greatly reduce the settlement ratio of the insert cap 32 in height and is not easy to collapse.

[0034] As a further embodiment, the metal insert 31 should preferably have a height of 16.4mm to fit the existing riveting machine, allowing for quick replacement without adjusting the riveting machine parameters.

[0035] It should also be noted that the 18.4mm full PEEK riveting fixture and the corresponding 16.4mm metal insert 31 in the aforementioned embodiments are examples. In essence, this solution achieves low-cost replacement by combining the split terminal support insert 3 with the original fixture at the same height, without limiting the overall height of the riveting fixture and the actual height of the metal insert 31.

[0036] See Figures 1-7 Optionally, it also includes a mounting block 2, which is installed into the mounting groove 11. The upper end of the mounting block 2 is provided with a first positioning groove 21. The insert cap 32 also includes a mounting arm 322, which is fixedly connected to the side wall of the insert 321. The mounting arm 322 is provided with a second mounting hole 323. The upper end of the mounting block 2 is provided with a second positioning groove 22 corresponding to the position of the mounting arm 322. The second positioning groove 22 is provided with a mating hole 23 corresponding to the position of the second mounting hole 323. The first positioning groove 21 is used to connect with the first positioning platform 311, and the second positioning groove 22 is used to connect with the mounting arm 322.

[0037] In this embodiment, the terminal support insert 3 is installed on the mounting block 2, and the mounting block 2 is installed into the mounting hole to install the terminal support insert 3 onto the mounting base 1. The mounting block 2 is preferably installed into the mounting groove 11 in a detachable manner, usually by direct placement, and its displacement is limited by the shape of the mounting groove 11. The height of the mounting block 2 should be lower than the height of the mounting base 1. At this time, the side wall of the mounting groove 11 can be used to limit the stop frame of the power battery cover. The height difference between the upper end of the mounting block 2 and the upper end of the mounting base 1 should be the same as the thickness of the stop frame.

[0038] The mounting block 2 can be customized with a first positioning groove 21 and a second positioning groove 22 corresponding to the shape of the terminal support insert 3 at the corresponding position, thereby using the matching side wall to limit the deformation of the insert cap 32. Therefore, the model of the compatible power battery cover 6 can be changed by directly replacing the mounting block 2, without having to replace the entire mounting base 1. The cooperation between the second positioning groove 22 and the mounting arm 322 can restrict the rotation of the insert cap 32 and prevent it from rotating under the drive of the pole post. At this time, the second positioning platform 312 can be a rotating surface, and the second positioning platform 312 may not play the role of restricting rotation. It should be noted that in the embodiment without the mounting arm 322, the shape of the second positioning should be used, such as a polygonal prism, to limit the position of the insert cap 32. Since the mounting arm 322 has good convenience when disassembling and replacing the insert cap 32, even if the second positioning platform 312 can play the role of limiting the position of the insert cap 32, it is advisable to adopt the embodiment with the mounting arm 322.

[0039] See Figures 1-7 Optionally, there is one mounting slot 11, and two mounting blocks 2 are installed in the same mounting slot 11. The length of the mounting block 2 is less than half the length of the mounting slot 11. A support block 4 is also installed between the two mounting blocks 2. The upper end of the support block 4 is lower than the upper end of the mounting block 2.

[0040] In this embodiment, two mounting blocks 2 are installed through a long strip mounting groove 11, which is simple to process and convenient to place. When in use, after the two mounting blocks 2 are installed into the mounting groove 11, the support block 4 with a chamfer at the lower end is squeezed between the two mounting blocks 2. This avoids the problem of difficult installation and replacement caused by the small fit gap between the mounting groove 11 and the mounting blocks 2 and the support block 4. At the same time, the height of the support block 4 is lower than the height of the mounting blocks 2 to form a receiving groove, which is used to receive and support the protruding bracket of the stop bracket corresponding to the explosion-proof valve position.

[0041] See Figures 1-7 Optionally, the mounting block 2 has a receiving hole 24.

[0042] In this embodiment, the liquid injection hole on the stop bracket of the power battery cover is accommodated by the receiving hole 24.

[0043] See Figures 1-7 Optionally, a positioning block 13 is detachably mounted on the mounting base 1. The positioning block 13 is U-shaped and located on one side of the mounting groove 11.

[0044] In this embodiment, as Figure 6 As shown, the side of the power battery cover is positioned by the positioning block 13, which enables quick installation and improves stability, avoiding the problem of the power battery cover easily detaching from the tooling under external force.

[0045] See Figures 1-7 Optionally, the mounting base 1 has a first mounting hole 12, which is used for mounting to the working platform of the riveting equipment.

[0046] In this embodiment, the mounting base 1 is clamped onto the riveting platform through the first mounting hole 12 to improve stability.

[0047] See Figures 1-7 Optionally, it also includes a pre-riveting film 5, which is used to overlap the upper end of the terminal post of the power battery cover plate 6.

[0048] In this embodiment, before riveting, pre-riveting is required. During pre-riveting, the pre-riveting film 5 is placed on the upper end of the terminal post of the power battery cover plate 6. When the pre-riveting head 7 performs the pre-riveting action, the pre-riveting film 5 added during the pre-riveting process has a certain degree of extensibility and adhesion, which can make the pressure and material flow more uniform and avoid the bare metal from being slightly bonded to the riveting head under high pressure friction, which would scratch the terminal surface and become a source of cracks. The introduction and use of pre-riveting film 5 lubricates, isolates, homogenizes deformation and protects the surface during the pre-riveting process of terminals, thereby eliminating local friction and stress peaks during pre-riveting and flanging, preventing cracks from initiating during plastic deformation, and improving the yield and reliability of the production process.

[0049] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A tooling for manufacturing a power battery cover with a riveted structure, characterized in that, Includes a mounting base (1) and a terminal support insert (3), wherein: The terminal support insert (3) includes a metal insert (31) and an insert cap (32). The insert cap (32) is made of PEEK and is fitted onto the upper end of the metal insert (31). The mounting base (1) has mounting grooves (11) at the positions of the two poles of the power battery cover (6). The upper end of the mounting base (1) has a flat surface for supporting the power battery cover (6). The two terminal support inserts (3) are installed in the mounting grooves (11). The upper end of the insert cap (32) is not higher than the upper end of the mounting base (1).

2. The tooling for producing a riveted power battery cover according to claim 1, characterized in that, The metal insert (31) includes a first positioning platform (311) and a second positioning platform (312), the second positioning platform (312) being fixedly connected to the upper end of the first positioning platform (311), and the insert cap (32) including a mating insert (321), the mating insert (321) being fitted onto the second positioning platform (312).

3. The tooling for producing a riveted power battery cover (6) according to claim 2, characterized in that, The upper end of the insert cap (32) is provided with a groove (324), the depth of which is 0.65-0.85mm.

4. The tooling for producing a riveted power battery cover according to claim 2, characterized in that, The thickness of the bearing surface of the insert cap (32) is 1.5-2.5mm.

5. The tooling for producing a riveted power battery cover according to claim 1, characterized in that, It also includes a mounting block (2), which is installed into the mounting groove (11). The upper end of the mounting block (2) is provided with a first positioning groove (21). The insert cap (32) also includes a mounting arm (322). The side wall of the mating insert (321) is fixedly connected to the mounting arm (322). The mounting arm (322) is provided with a second mounting hole (323). The upper end of the mounting block (2) is provided with a second positioning groove (22) corresponding to the position of the mounting arm (322). The second positioning groove (22) is provided with a mating hole (23) corresponding to the position of the second mounting hole (323). The first positioning groove (21) is used to connect with the first positioning platform (311). The second positioning groove (22) is used to connect with the mounting arm (322).

6. The tooling for producing a riveted power battery cover according to claim 5, characterized in that, The number of mounting slots (11) is one, and two mounting blocks (2) are installed in the same mounting slot (11). The length of the mounting block (2) is less than half the length of the mounting slot (11). A support block (4) is also installed between the two mounting blocks (2). The upper height of the support block (4) is lower than the upper height of the mounting block (2).

7. The tooling for producing a riveted power battery cover according to claim 6, characterized in that, The mounting block (2) has a receiving hole (24).

8. The tooling for producing a riveted power battery cover according to claim 7, characterized in that, A positioning block (13) is detachably mounted on the mounting base (1). The positioning block (13) is U-shaped and is located on one side of the mounting groove (11).

9. A tooling for producing a power battery cover plate with a riveting structure according to any one of claims 1-8, characterized in that, The mounting base (1) has a first mounting hole (12), which is used for mounting to the working platform of the riveting equipment.

10. The tooling for producing a riveted power battery cover according to claim 9, characterized in that, It also includes a pre-riveting film (5), which is used to overlap the upper end of the terminal post of the power battery cover plate (6).

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