A spin riveting structure power battery cover plate assembly

Abstract

The utility model relates to power battery technical field especially relates to a kind of power battery cover plate assembly of spin riveting structure, including positive pole, negative pole, sealing ring, top cover piece, lower plastic, positive pole and negative pole are assembled on top cover piece, the middle flange step of positive pole and negative pole is all set with several rotation-stop grooves, the bottom of positive pole and negative pole is provided with positioning column and the sealing ring is assembled on positioning column;Two pole grooves are provided on top cover piece, and rotation-stop groove and / or rotation-stop rib are provided on the side wall of pole groove.The utility model is provided with rotation-stop groove and / or rotation-stop rib on the side wall of pole groove of top cover piece, the torsion of positive pole and negative pole is improved after upper plastic is integrally injection molded, replace welding ring parts in previous process, fundamentally reduce manufacturing cost, simplify production process;The bottom of positive pole and negative pole is provided with positioning column, the deformation influence of upper plastic injection molding process and electrolyte soaking to sealing ring is improved, effectively improve the sealing property of cover plate pole.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a riveted power battery cover assembly. Background Technology

[0002] Currently, the structures of most power / energy storage battery top cover plate assemblies in the industry can be divided into terminal post riveting cover plates, positive and negative electrode integral injection molded rubber cover plates, and welded ring welded minimalist cover plates. For example, Chinese Patent Publication No. CN215869577U discloses a power battery top cover plate assembly, which has a liquid injection hole with a front countersunk hole and a back protrusion, an explosion-proof hole with a front protrusion and a back countersunk hole, a positive electrode post hole and a negative electrode post hole with a front countersunk hole, and a set of riveting posts with a front countersunk hole and a back protrusion on the bottom plastic. The positive and negative terminal holes correspond to the positive and negative connecting piece through holes and the riveting through holes corresponding to a set of riveting posts; the explosion-proof sheet is welded into the countersunk hole on the back of the explosion-proof sheet hole on the top cover plate; the positive terminal sealing ring and the positive terminal are installed in the countersunk hole on the front of the positive terminal hole; the negative terminal sealing ring and the negative terminal are installed in the countersunk hole on the front of the negative terminal hole; the upper plastic of the positive terminal and the upper plastic of the negative terminal are respectively set at the positive terminal hole and the negative terminal hole through the mold injection process; the lower plastic and the top cover plate are tightly connected through the riveting through holes and riveting posts.

[0003] This patent features an integral rubber-coated structure. The welding ring needs to be welded to the top cover plate, and the positive and negative connecting plates are connected to the poles, requiring a convex structure. This results in high manufacturing costs, and the sealing ring has no fixed position, making it prone to deformation. Utility Model Content

[0004] This utility model solves the problems in related technologies and proposes a riveted structure power battery cover assembly. The side wall of the terminal slot of the top cover is provided with anti-rotation groove and / or anti-rotation rib. After integral injection molding of plastic, the torque of the positive and negative terminals is improved, replacing the welded ring parts in the previous process, fundamentally reducing manufacturing costs and simplifying the production process. The bottom of the positive and negative terminals is provided with positioning posts, which improves the deformation effect of the sealing ring on the plastic injection process and electrolyte immersion, effectively improving the sealing performance of the cover terminal.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a riveted power battery cover assembly, including a positive terminal post, a negative terminal post, a sealing ring, and a top cover plate. Several anti-rotation grooves are provided on the intermediate flange steps of the positive and negative terminal posts. Positioning posts are provided at the bottom of the positive and negative terminal posts, and the sealing ring is assembled on the positioning posts. Two terminal post grooves are provided on the top cover plate, and anti-rotation grooves and / or anti-rotation ribs are provided on the side walls of the terminal post grooves. The positive and negative terminal posts are assembled in the terminal post grooves.

[0006] As a preferred embodiment, it also includes plastic on the positive electrode and plastic on the negative electrode, wherein the plastic on the positive electrode and plastic on the negative electrode are installed on the positive electrode post and the negative electrode post by injection molding.

[0007] As a preferred embodiment, the top cover plate is provided with an explosion-proof valve positioning groove, and an explosion-proof valve is installed on the explosion-proof valve positioning groove.

[0008] As a preferred embodiment, an explosion-proof valve film is affixed above the positioning groove of the explosion-proof valve, and the explosion-proof valve film is provided with a puncture vent hole.

[0009] As a preferred embodiment, the top cover plate is provided with a first injection hole and several hot-melt sink holes.

[0010] As a preferred embodiment, the system also includes a lower plastic sheet, on which hot-melt columns are provided in a manner consistent with the number and position of the hot-melt countersunk holes on the top cover sheet, and a second injection hole is provided on the lower plastic sheet at a position corresponding to the position of the first injection hole on the top cover sheet.

[0011] As a preferred embodiment, the lower plastic body is provided with shrinkage ribs.

[0012] As a preferred embodiment, it also includes a positive electrode connecting piece and a negative electrode connecting piece, which are disposed on both sides of the bottom of the lower plastic.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) Anti-rotation grooves and / or anti-rotation ribs are provided on the side wall of the pole slot of the top cover plate. After the plastic is integrally injected, the torque of the positive and negative poles is increased, replacing the welding ring parts in the previous process, fundamentally reducing manufacturing costs, simplifying the production process, and increasing the mechanical strength of the component. (2) Anti-rotation grooves are provided on the middle flange steps of the positive and negative terminals. After the corresponding plastic is integrally injected, the torque of the terminal is increased. Positioning posts are provided at the bottom of the positive and negative terminals, which improves the deformation effect of the plastic injection process and electrolyte immersion on the sealing ring, and effectively improves the sealing performance of the cover plate terminal. (3) Shrink ribs are provided on the lower plastic, which can improve the assembly of the lower plastic due to shrinkage size problems and effectively improve the manufacturing yield of the cover plate; (4) The hot melt pillars set in the lower plastic are installed on the hot melt countersunk holes set on the back of the top cover. The lower plastic and the top cover are tightly connected by the hot melt equipment. The process required for this structure is simple and safe and reliable. (5) The perimeter of the explosion-proof valve film is equipped with an electrolyte-resistant adhesive to effectively prevent electrolyte from flowing into the explosion-proof valve during the injection process and causing contamination of the explosion-proof valve surface. The explosion-proof valve film is equipped with a puncture vent hole in the middle, which can effectively vent air and also avoid external environmental contamination of the explosion-proof valve surface. Attached Figure Description

[0014] Figure 1 This is an exploded view of this utility model; Figure 2 This is a diagram of the entire assembly of this utility model; Figure 3 This is a schematic diagram of the structure of the top cover sheet of this utility model; Figure 4 This is a schematic diagram of the positive electrode post of this utility model; Figure 5 This is a schematic diagram of the negative electrode post of this utility model; Figure 6 This is a schematic diagram of the structure of the plastic component in this utility model; Figure 7 This is a schematic diagram of the structure of the explosion-proof valve film of this utility model; Figure 8 This is a detailed schematic diagram of the top cover plate, positive electrode post, negative electrode post, and sealing ring after riveting. Figure 9 This is a schematic diagram of the integral injection molding of the positive electrode and the negative electrode after riveting of this utility model.

[0015] In the picture: 1. Positive electrode plastic, 2. Negative electrode plastic, 3. Positive electrode post, 31. Positive electrode anti-rotation groove, 32. Positive electrode positioning post, 4. Negative electrode post, 41. Negative electrode anti-rotation groove, 42. Negative electrode positioning post, 5. Sealing ring, 6. Top cover plate, 61. Electrode post groove, 62. Anti-rotation rib, 63. Hot melt countersunk hole, 64. First injection hole, 65. Explosion-proof valve positioning groove, 66. First anti-rotation groove, 7. Explosion-proof valve, 8. Lower plastic, 81. Hot melt post, 82. Shrinkage rib, 83. Second injection hole, 9. Positive electrode connecting piece, 10. Negative electrode connecting piece, 11. Explosion-proof valve film, 111. Puncture vent hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0019] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0022] like Figures 1 to 9 As shown, a riveted power battery cover assembly includes a positive terminal post 3, a negative terminal post 4, a sealing ring 5, and a top cover plate 6. The positive terminal post 3 and the negative terminal post 4 are assembled on the top cover plate 6. Several anti-rotation grooves are formed on the intermediate flange steps of both the positive terminal post 3 and the negative terminal post 4. The anti-rotation grooves have an inverted eight-shaped inward-fastening structure, which can improve the torque of the corresponding terminal post after integral injection molding. Specifically, six positive anti-rotation grooves 31 are formed on the intermediate flange step of the positive terminal post 3, and six negative anti-rotation grooves 41 are formed on the intermediate flange step of the negative terminal post 4. The torque of the terminal post is improved after integral injection molding. Positioning posts are provided at the bottom of the positive terminal post 3 and the negative terminal post 4, and the sealing ring 5 is assembled on the positioning posts. Specifically, a positive positioning post 32 is provided at the bottom of the positive terminal post 3, and a sealing ring 5 is assembled on the bottom of the negative terminal post 4. The part is equipped with a negative electrode positioning post 42, and the sealing ring 5 is installed on the corresponding positioning post. This improves the deformation effect of the sealing ring 5 on the plastic injection process and electrolyte immersion, and effectively improves the sealing performance of the electrode post. The top cover plate 6 is provided with two electrode post grooves 61. The electrode post groove 61 has a structure with a front stretching and flipping hole, a bottom stamping flat and a middle through hole. The inner side wall of the electrode post groove 61 is provided with a first anti-rotation groove 66 and the outer side wall is provided with an anti-rotation rib 62. Of course, in order to save costs, only the first anti-rotation groove 66 can be provided on the inner side wall, or only the anti-rotation rib 62 can be provided on the outer side wall. After the plastic is injected in one piece, the torque of the positive and negative electrode posts is improved, replacing the welded ring parts in the previous process, fundamentally reducing manufacturing costs, simplifying the production process, and increasing the mechanical strength of the component.

[0023] In addition, the positive electrode post 3 is made of aluminum strip by one-piece stamping, which reduces manufacturing costs, and the negative electrode post 4 is made of copper-aluminum composite material by one-piece stamping, which also reduces manufacturing costs.

[0024] In one embodiment, the top cover plate 6 is provided with a first injection hole 64 and eight hot-melt countersunk holes 63, wherein the first injection hole 64 has a structure of a front countersunk hole, a back protrusion, and a middle through hole.

[0025] In one embodiment, the top cover plate 6 is provided with an explosion-proof valve positioning groove 65, which has a structure of a countersunk hole on the back and a through hole in the middle, and an explosion-proof valve 7 is installed on the explosion-proof valve positioning groove 65.

[0026] In one embodiment, an explosion-proof valve film 11 is pasted on the front of the explosion-proof valve positioning groove 65 of the top cover plate 6. An electrolyte-resistant adhesive is provided around the edge of the explosion-proof valve film 11 to effectively prevent electrolyte from flowing into the explosion-proof valve 7 during the liquid injection process and causing surface contamination of the explosion-proof valve 7. The explosion-proof valve film 11 is provided with a puncture vent hole 111, which can effectively vent air and also prevent external environment from contaminating the surface of the explosion-proof valve.

[0027] In one embodiment, the device further includes a positive electrode plastic 1 and a negative electrode plastic 2, which are installed on the positive electrode post 3 and the negative electrode post 4 by injection molding.

[0028] In one embodiment, the system further includes a lower plastic 8, on which hot-melt columns 81 are provided in a manner consistent with the number and position of the hot-melt countersunk holes 63. A second injection hole 83 is provided on the lower plastic 8 at a position corresponding to the first injection hole 64. The second injection hole 83 has a structure of a front countersunk hole, a back protrusion, and a through hole in the middle.

[0029] In one embodiment, shrinkage ribs 82 are provided on the lower plastic 8 to improve the assembly problem caused by shrinkage of the lower plastic 8, and can effectively improve the manufacturing yield of the cover plate.

[0030] In one embodiment, it further includes a positive electrode connecting piece 9 and a negative electrode connecting piece 10, which are disposed on both sides of the bottom of the lower plastic 8.

[0031] The assembly process is as follows: (1) Place the top cover plate 6 into a special welding fixture, place the explosion-proof valve 7 into the explosion-proof valve positioning groove 65 on the back of the top cover plate 6, and achieve sealing welding by laser welding. (2) Then assemble the two sealing rings 5 ​​onto the positive electrode positioning post 32 and the negative electrode positioning post 42 respectively; (3) Place the positive terminal 3 and negative terminal 4, with the sealing ring 5 installed, into the terminal groove 61 of the top cover plate 6, which has been welded with the explosion-proof valve 7. Use a riveting device to position the shape of the top cover plate 6, press the positive terminal 3 and negative terminal 4, and rivet the side wall of the flanged hole in the terminal groove 61 of the top cover plate 6 so that it is as shown. Figure 8 (At point A) the surface is flat and the dimensions meet the design requirements; (4) Place the semi-finished product obtained in step (3) into the plastic coating mold on the positive and negative electrodes. Use injection molding to press the positive electrode post 3 and the negative electrode post 4 through the mold to compress and seal the sealing ring 5, and then inject the plastic 1 on the positive electrode and the plastic 2 on the negative electrode. Figure 9 As shown, this achieves the overall sealing performance of the positive and negative terminals of the entire battery top cover assembly; (5) The hot melt column 81 of the lower plastic 8 is installed on the hot melt counterhole 63 on the back of the top cover plate 6 of the injection-molded positive and negative electrode plastic, and the tight connection between the lower plastic 8 and the top cover plate 6 is achieved by the hot melt equipment. (6) Finally, attach the explosion-proof valve film 11 to the front of the explosion-proof valve positioning groove 65 of the top cover plate 6 to protect the explosion-proof valve 7.

[0032] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A riveted power battery cover assembly, characterized in that: The device includes a positive electrode post (3), a negative electrode post (4), a sealing ring (5), and a top cover plate (6). Several anti-rotation grooves are provided on the intermediate flange steps of the positive electrode post (3) and the negative electrode post (4). Positioning posts are provided at the bottom of the positive electrode post (3) and the negative electrode post (4), and the sealing ring (5) is assembled on the positioning posts. Two electrode post grooves (61) are provided on the top cover plate (6), and anti-rotation grooves and / or anti-rotation ribs (62) are provided on the side walls of the electrode post grooves (61). The positive electrode post (3) and the negative electrode post (4) are assembled in the electrode post grooves (61).

2. The riveted structure power battery cover assembly according to claim 1, characterized in that: It also includes a positive electrode plastic (1) and a negative electrode plastic (2), which are installed on the positive electrode post (3) and the negative electrode post (4) by injection molding.

3. The power battery cover assembly with riveted structure according to claim 1, characterized in that: An explosion-proof valve positioning groove (65) is provided on the top cover plate (6), and an explosion-proof valve (7) is installed on the explosion-proof valve positioning groove (65).

4. The riveted structure power battery cover assembly according to claim 3, characterized in that: An explosion-proof valve film (11) is pasted above the positioning groove (65) of the explosion-proof valve, and a puncture vent hole (111) is provided on the explosion-proof valve film (11).

5. The riveted structure power battery cover assembly according to claim 1, characterized in that: The top cover plate (6) is provided with a first injection hole (64) and several hot melt sink holes (63).

6. The riveted structure power battery cover assembly according to claim 5, characterized in that: It also includes a lower plastic (8), on which hot melt columns (81) are provided in the same number and position as the hot melt countersunk holes (63), and a second injection hole (83) is provided on the lower plastic (8) at a position corresponding to the first injection hole (64).

7. The riveted structure power battery cover assembly according to claim 6, characterized in that: Shrink ribs (82) are provided on the lower plastic (8).

8. The riveted structure power battery cover assembly according to claim 7, characterized in that: It also includes a positive electrode connecting piece (9) and a negative electrode connecting piece (10), which are disposed on both sides of the bottom of the lower plastic (8).

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