Battery top cover structure with connected and fixed top

Abstract

The utility model relates to a battery top cover structure with a connected and fixed top, comprising: a top cover plate having a first pole via hole, the upper surface of the top cover plate protruding upward at the periphery of the first pole via hole to form a welding boss; the pole is arranged on the top cover plate in an insulating manner; the lower support is provided with a second pole through hole, and the top cover plate is arranged on the lower support and connected with the lower support; the fixing cover is provided with a third pole through hole penetrating in the thickness direction, the fixing cover is arranged on the welding boss and welded to the welding boss, and at least part of the edge of the fixing cover extends out of the welding boss to form a limiting outer edge; and the pole cap is arranged on the outer side of the pole in a surrounding manner and is respectively connected with the top cover plate, the pole and the fixed cover. The limiting outer edge is formed by the part, extending out of the welding boss, of the fixing cover, the pole cap can be effectively limited in the longitudinal direction, the pole cap can be tightly attached to the top cover plate during demolding, and the phenomenon that the root of the pole cap upwarps upwards can be effectively reduced or avoided.

Description

Technical Field

[0001] This application relates to the technical field of secondary battery processing, specifically to a battery top cover structure with top connection and fixation. Background Technology

[0002] In existing power battery structures, there are generally three components: a casing, battery cells, and a top cover assembly. The battery cells are housed inside the casing, and the top cover assembly is used to seal the casing. The top cover assembly typically includes a lower bracket, a top cover plate, a sealing ring, and positive and negative bipolar terminals. Furthermore, to enhance the fixation of the terminals and reduce the possibility of displacement or detachment during use, a bracket is installed on the outside of the terminals. This bracket is usually a frame structure adapted to the terminals, fitted onto the outside of the terminals, and used with injection-molded terminal caps to secure the terminals. The bracket is typically made of metal and is fixed to the top cover plate by welding during assembly.

[0003] For example, CN218513547U discloses a top cover assembly and a secondary battery for a secondary battery, wherein the bracket and the top cover are connected and fixed by bottom welding. This structure has the following defects in actual production:

[0004] After the bracket is welded, the bracket and the top cover plate are placed into the mold to form the electrode cap. Since the electrode cap does not have an effective limiting structure in the longitudinal direction, it is only connected to the top cover plate by the adhesive force between the electrode cap and the top cover plate. In particular, during the demolding stage, the electrode cap and the top cover plate are prone to not fitting tightly, resulting in the electrode cap root curling upwards, which affects the yield. Utility Model Content

[0005] To address the problems existing in the prior art, this application aims to provide a battery top cover structure with a top connection and fixation. This application uses the portion of the fixed cover extending beyond the welding boss to form a limiting outer edge, which effectively limits the electrode cap in the longitudinal direction. This ensures that the electrode cap fits tightly with the top cover plate during demolding, effectively reducing or preventing the electrode cap's root from curling upwards.

[0006] The battery top cover structure with top connection and fixation described in this application includes:

[0007] The top cover plate has a first pole post through hole that extends through the thickness direction, and the upper surface of the top cover plate has a welding boss that protrudes upward around the first pole post through hole.

[0008] The electrode post, whose insulation is disposed on the top cover plate, is located at the through hole of the first electrode post;

[0009] The lower support has a second pole through hole that extends through the thickness direction, the position of the second pole through hole corresponding to the position of the first pole through hole, and the top cover plate is disposed on the lower support and connected to the lower support;

[0010] A fixing cover, made of metal, has a through hole for a third pole post extending through the thickness direction. The fixing cover is disposed on the welding boss and welded to the welding boss. At least a portion of the edge of the fixing cover extends outward beyond the welding boss to form a limiting outer edge.

[0011] The pole cap is disposed around the outside of the pole post and is connected to the top cover plate, the pole post and the fixing cover respectively.

[0012] Preferably, the upper surface of the welding boss protrudes upward on the outer side to form a first step, so as to form a first embedding groove on the inner side of the first step; the fixing cover includes a first embedding part and a first cover part located above the first embedding part, the first embedding part is flush with the inner edge of the first cover part, the width of the first cover part is greater than the width of the first embedding part, so as to form a side groove on the lower surface of the fixing cover near the outer edge, the thickness of the first embedding part is adapted to the depth of the first embedding groove, and the width difference between the first cover part and the first embedding part is greater than the width of the first step;

[0013] The first embedding part is partially embedded in the first embedding groove, and the outer side of the first embedding part abuts against the inner side of the first step, so that the outer side of the first cover part extends out of the welding boss to form the limiting outer edge.

[0014] Preferably, the mating surface between the first step and the first embedded part is an inclined surface that gradually slopes inward from top to bottom.

[0015] Preferably, the upper surface of the welding boss protrudes upward on the inner side to form a second step, so as to form a second embedding groove on the outer side of the second step; the fixing cover includes a second embedding part and a second cover part located above the second embedding part, the thickness of the second embedding part is adapted to the depth of the second embedding groove, and the width of the second embedding part is greater than the width of the second embedding groove;

[0016] The second embedding part is partially embedded in the second embedding groove, and the inner side of the second embedding part abuts against the outer side of the second step, so that the outer side of the second embedding part extends out of the welding boss to form the limiting outer edge.

[0017] Preferably, the mating surface between the second embedding part and the second step is an inclined surface that gradually slopes outward from top to bottom.

[0018] Preferably, the inner edge of the fixing cover is formed with an adhesive injection groove.

[0019] Preferably, the pole post is cylindrical, and a plurality of anti-torsion grooves are formed on the outer circumferential surface of the upper part of the pole post. The plurality of anti-torsion grooves are distributed at equal angular intervals along the circumference of the pole post, and part of the inner edge of the pole cap is filled into the anti-torsion grooves.

[0020] Preferably, the anti-torsion groove extends in a direction inclined to the axial direction of the pole.

[0021] Preferably, the anti-torsion groove is an arc-shaped groove.

[0022] Preferably, the top cover plate has an explosion-proof hole in the middle, an explosion-proof valve is installed on the explosion-proof hole, and the explosion-proof valve has cross-shaped scratches.

[0023] The advantages of the battery top cover structure with top connection and fixation described in this application are:

[0024] 1. This application sets up a welding boss and a fixed cover structure, so that at least part of the fixed cover extends outward beyond the welding boss to form a limiting outer edge. The limiting outer edge can effectively limit the pole cap in the longitudinal direction, thereby ensuring that the pole cap remains tightly fitted with the top cover plate during demolding, and effectively reducing or avoiding the phenomenon of the pole cap root curling upward.

[0025] 2. This application addresses the cylindrical pole structure by providing several anti-torsion grooves on the outer circumferential surface of the pole. When the pole cap is injection molded, the inner edge of the pole cap fills into the anti-torsion grooves to form an anti-torsion structure, which can limit the pole in the circumferential direction and prevent the pole from torturing in the circumferential direction. Furthermore, by setting the anti-torsion grooves as an inclined structure, the pole can be limited in the circumferential direction as well as in the axial direction, which can reduce the risk of the pole falling off upward and further improve product quality.

[0026] 3. This application improves the explosion-proof pressure relief effect of the explosion-proof valve and enhances the safety performance of the product by setting cross-shaped scratches on the explosion-proof valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a top-connected and fixed battery top cover structure as described in this application;

[0028] Figure 2 yes Figure 1 Exploded view;

[0029] Figure 3 This is a cross-sectional view of the electrode positions of the battery top cover structure in Embodiment 1;

[0030] Figure 4 This is a schematic diagram of the fixed cover in Embodiment 1;

[0031] Figure 5This is a cross-sectional view of the electrode positions of the battery top cover structure in Embodiment 2;

[0032] Figure 6 This is a schematic diagram of the fixed cover in Embodiment 2;

[0033] Figure 7 This is a structural schematic diagram of the top cover plate described in this application;

[0034] Figure 8 yes Figure 7 A schematic diagram of the structure after the explosion-proof valve is installed;

[0035] Figure 9 yes Figure 8 A schematic diagram of the structure after connecting the lower support;

[0036] Figure 10 yes Figure 9 A schematic diagram of the structure after the sealing ring is installed;

[0037] Figure 11 yes Figure 10 A schematic diagram of the structure after the pole piece is installed;

[0038] Figure 12 yes Figure 11 A schematic diagram of the structure after the fixing cover is installed;

[0039] Figure 13 yes Figure 12 Schematic diagram of the structure after injection molding to form the electrode cap;

[0040] Figure 14 This is a schematic diagram of the pole post structure with anti-torsion groove described in this application;

[0041] Figure 15 Is with Figure 14 A schematic diagram of the pole cap structure adapted to the pole post phase;

[0042] Figure 16 yes Figure 3 A magnified structural diagram of position A in the middle;

[0043] Figure 17 yes Figure 5 A magnified structural diagram of position B in the middle.

[0044] Explanation of reference numerals in the attached drawings: 1-Top cover plate, 11-First pole post through hole, 12-Welding boss, 2-Pole post, 21-Anti-torsion groove, 3-Lower bracket, 4-Fixing cover, 41a-First embedded part, 42a-First cover part, 41b-Second embedded part, 42b-Second cover part, 5-Pole cap, 6-Sealing ring, 7-Explosion-proof valve, a-Welding position. Detailed Implementation

[0045] like Figures 1-17As shown, the battery top cover structure with top connection and fixation described in this application includes:

[0046] Top cover plate 1, details as follows Figure 7 As shown, the top cover plate 1 is typically a square plate structure with a first terminal through-hole 11 extending along its thickness direction for the terminal 2 to pass through, allowing the terminal 2 to be electrically connected to the battery cell inside the battery casing. In a bipolar structure, there are usually two first terminal through-holes 11, distributed at both ends of the length of the top cover plate 1, corresponding to the positive terminal and the negative terminal respectively.

[0047] The electrode post 2, typically two in number, is designated as a positive and a negative electrode post. The shape and size of the electrode post 2 generally correspond to the first electrode post through-hole 11. It is made of conductive material; for the negative electrode post, the upper part is required to be made of aluminum and the lower part of copper. In this embodiment, the electrode post 2 has a cylindrical structure. In other optional embodiments, the electrode post 2 can be prismatic or other irregularly shaped. This application does not limit the specific shape of the electrode post 2. The electrode post 2 is insulated and disposed on the top cover plate 1, located at the first electrode post through-hole 11 of the top cover plate 1.

[0048] The lower bracket 3, typically made of plastic, is insulating. It is a long plate-shaped structure adapted to the top cover 1, and is connected to the top cover 1. The lower bracket 3 separates the top cover 1 from the battery casing, insulating them and preventing contact between the top cover 1 and the battery cells inside the battery casing, thus avoiding short circuits. The lower bracket 3 has a second electrode through-hole corresponding to the first electrode through-hole 11, extending along its thickness.

[0049] In specific embodiments, the height of the pole post 2 can be designed according to requirements. For example, one type of pole post 2 has a smaller height and is located above the second pole post through hole of the lower bracket 3 after assembly. Another type of pole post 2 has a moderate height and extends into the middle of the second pole post through hole after assembly. A third type of pole post 2 has a larger height and passes through the second pole post through hole to protrude outside the lower bracket 3 after assembly. The three different heights of pole post 2 can be designed according to actual needs.

[0050] The fixing cover 4 is made of metal. The middle of the fixing cover 4 has a third pole post through hole that runs through the thickness direction. It is used to surround the outside of the pole post 2 and work with the pole cap 5 to fix the pole post 2.

[0051] To address the issues of easy detachment and warping of the cap 5 during demolding in the prior art, this application improves the structure of the top cover plate 1 and the fixed cover 4, as follows:

[0052] The upper surface of the top cover plate 1 protrudes upward to form a welding boss 12 around the periphery of the first pole post through hole 11. For example, corresponding to the circular first pole post through hole 11, the welding boss 12 is annular.

[0053] The fixing cover 4 is generally annular in shape with a diameter similar to that of the welding boss 12. The fixing cover 4 is disposed on the welding boss 12 and welded to the welding boss 12. At least part of the edge of the fixing cover 4 extends outward beyond the welding boss 12, forming a limiting outer edge, that is, at least part of the fixing cover 4 is exposed outside the welding boss 12.

[0054] The pole cap 5 is arranged around the outside of the pole post 2 and is connected to the top cover plate 1, the pole post 2 and the fixing cover 4 respectively, so as to connect the top cover plate 1, the pole post 2 and the fixing cover 4 to form an integrated structure.

[0055] The mating structure between the fixed cover 4 and the welding boss 12 has at least the following two implementation methods.

[0056] Example 1

[0057] Please refer to the detailed information. Figure 3 , Figure 4 The upper surface of the welding boss 12 protrudes upward on the outer side to form a first step, and a first embedding groove is formed on the inner side of the first step, with an inner opening. The fixing cover 4 includes a first embedding part 41a and a first cover part 42a located above the first embedding part 41a. The inner edge of the first embedding part 41a and the inner edge of the first cover part 42a are flush, that is, the inner surface of the fixing cover 4 is a plane.

[0058] The width of the first cover portion 42a is greater than the width of the first insert portion 41a, so as to form a side groove on the lower surface of the fixed cover 4 near the outer edge. The thickness of the first insert portion 41a is adapted to the depth of the first insert groove. The width difference between the first cover portion 42a and the first insert portion 41a is greater than the width of the first step.

[0059] The first embedding part 41a is partially embedded in the first embedding groove, and the outer side of the first embedding part 41a abuts against the inner side of the first step. Since the width difference between the first cover part 42a and the first embedding part 41a is greater than the width of the first step, the outer edge of the first cover part 42a will extend beyond the welding boss 12 to form the aforementioned limiting outer edge.

[0060] Furthermore, the mating surface between the first step and the first embedded part 41a is an inclined surface that gradually slopes inward from top to bottom. This structure facilitates the mounting of the fixing cover 4 onto the welding boss 12 from top to bottom.

[0061] Example 2

[0062] Please refer to the detailed information. Figure 5 , Figure 6The upper surface of the welding boss 12 protrudes upward on the inner side to form a second step, thereby forming a second embedding groove on the outer side of the second step. The fixing cover 4 includes a second embedding part 41b and a second cover part 42b located above the second embedding part 41b. The thickness of the second embedding part 41b is adapted to the depth of the second embedding groove, and the width of the second embedding part 41b is greater than the width of the second embedding groove.

[0063] The second embedding part 41b is partially embedded in the second embedding groove, and the inner side of the second embedding part 41b abuts against the outer side of the second step. Since the width of the second embedding part 41b is greater than the width of the second embedding groove, the outer side of the second embedding part 41b extends out of the welding boss 12, forming the aforementioned limiting outer edge.

[0064] Furthermore, the mating surface between the second insert 41b and the second step is an inclined surface that gradually slopes outward from top to bottom. This structure facilitates the fitting of the fixing cover 4 onto the welding boss 12 from top to bottom.

[0065] Both of the above embodiments enable the fixing cover 4 to form a limiting outer edge on the outside of the welding boss 12, and have the advantages of simple structure and easy processing and assembly. They can be selected and set according to actual production.

[0066] Furthermore, in this embodiment, the inner edge of the fixing cover 4 is recessed outward to form a plurality of injection grooves. The injection grooves are square grooves, and there are several of them, for example, four. They are distributed at equal angular intervals around the axis of the fixing cover 4. When the electrode cap 5 is formed by injection molding, the glue will flow into the injection grooves. After molding, the glue will fill the injection grooves to play a circumferential limiting role for the fixing cover 4.

[0067] Furthermore, in this embodiment, please refer to the detailed description. Figure 14 The electrode post 2 is cylindrical, and several anti-torsion grooves 21 are formed on the outer circumferential surface of the upper part of the electrode post 2. The anti-torsion grooves 21 are distributed at equal angles along the circumference of the electrode post 2. During the injection molding process of forming the electrode cap 5, the adhesive will flow into the anti-torsion grooves 21. Figure 15 As shown, after molding, a colloid is formed and filled in the anti-torsion groove 21 to provide circumferential positioning for the pole post 2.

[0068] Furthermore, in this embodiment, the extension direction of the anti-torsion groove 21 is inclined to the axial direction of the pole post 2. The inclined anti-torsion groove 21 structure can make the anti-torsion groove 21 have a certain extension width in the lateral direction. Thus, the pole post 2 can be limited in the vertical direction to a certain extent by the formed pole cap 5, which can effectively reduce the phenomenon of the pole post 2 falling off upward and improve product quality.

[0069] Furthermore, in this embodiment, the anti-torsion groove 21 is an arc-shaped groove. The arc-shaped groove has the advantage of being easy to process and is more conducive to the flow of adhesive into the anti-torsion groove 21 for molding. Compared with the right-angled groove, it is less likely to form dead corner gaps.

[0070] Furthermore, in this embodiment, an explosion-proof hole is provided in the middle of the top cover plate 1, and an explosion-proof valve 7 is installed on the explosion-proof hole. The explosion-proof valve 7 has cross-shaped scratches. When the pressure inside the housing is too high and pressure needs to be released, the cross-shaped scratches make the explosion-proof valve 7 easier to burst open to release pressure, which can improve the safety performance of the product.

[0071] For example, the processing technology of the battery top cover structure in this embodiment includes the following steps:

[0072] S01. Prepare the suitable top cover plate 1, pole post 2, lower bracket 3 and fixing cover 4 for later use; specifically, use metal materials to stamp the top cover plate 1, pole post 2 and fixing cover 4 and other parts, and use mold injection molding to form the lower bracket 3.

[0073] S02, such as Figure 8 As shown, the explosion-proof valve 7 is installed in the explosion-proof valve 7 mounting hole of the top cover plate 1;

[0074] S03, such as Figure 9 As shown, the lower bracket 3 is connected to the top cover plate 1. Specifically, the lower bracket 3 is connected to the top cover plate 1 through the buckle part.

[0075] S04, such as Figure 10 As shown, the sealing ring 6 is installed on the top cover plate 1. Specifically, the sealing ring 6 is fitted onto the outside of the snap-fit ​​part.

[0076] S05, such as Figure 11 As shown, the pole 2 is installed at the first pole through hole 11 of the top cover plate 1;

[0077] S06, such as Figure 12 As shown, the fixing cover 4 is installed onto the top cover plate 1, so that the fixing cover 4 covers the welding boss 12 on the top cover plate 1. From the position corresponding to the welding boss 12 on the upper surface of the fixing cover 4, for example... Figure 16 Welding is performed at position a in the middle to weld and fix the fixing cover 4 to the top cover plate 1;

[0078] S07, such as Figure 13 As shown, the integrated structure formed by the top cover plate 1, sealing ring 6, pole post 2 and fixing frame is placed into the mold and the pole cap 5 is formed by injection molding on the outside of the pole post 2;

[0079] S08. Mark the obtained top cover assembly and attach a protective film to the explosion-proof valve 7. Then, conduct helium gas testing and insulation withstand voltage testing. After passing the test, the battery top cover structure is obtained.

[0080] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application 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 application.

[0081] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this application.

Claims

1. A battery top cover structure with top connection fixation, characterized by, The application relates to a top cover plate, a pole, a lower support, a fixing cover and a pole cap. The upper surface of the welding boss is outwardly protruded to form a first step, and a first embedding groove is formed on the inner side of the first step. The first embedding part is partially embedded in the first embedding groove, and the outer side surface of the first embedding part is abutted to the inner side surface of the first step, so that the outer side part of the first cover part is protruded outside the welding boss to form the limiting outer edge. The matching surface of the first step and the first embedding part is a gradually inwardly inclined inclined surface from top to bottom. The upper surface of the welding boss is outwardly protruded to form a first step, and a first embedding groove is formed on the inner side of the first step. The first embedding part is partially embedded in the first embedding groove, and the outer side surface of the first embedding part is abutted to the inner side surface of the first step, so that the outer side part of the first cover part is protruded outside the welding boss to form the limiting outer edge.

2. The top-attachable battery top cover structure of claim 1, wherein, The matching surface of the first step and the first embedding part is a gradually outwardly inclined inclined surface from top to bottom. The upper surface of the welding boss is outwardly protruded to form a first step, and a first embedding groove is formed on the inner side of the first step.

3. The battery top cover structure of claim 2, wherein the top connecting member is formed in a shape of a ring. The first embedding part is partially embedded in the first embedding groove, and the outer side surface of the first embedding part is abutted to the inner side surface of the first step, so that the outer side part of the first cover part is protruded outside the welding boss to form the limiting outer edge.

4. The top-attachable battery cover structure of claim 1, wherein The matching surface of the first step and the first embedding part is a gradually outwardly inclined inclined surface from top to bottom. The inner edge of the fixing cover is provided with a glue injection groove.

5. The top-attachable battery cover structure of claim 4, wherein The pole is cylindrical, and the outer circumferential surface of the upper part of the pole is provided with a plurality of anti-twist grooves which are equiangularly spaced along the circumferential direction of the pole.

6. The top-attached fixed battery top cover structure according to any one of claims 1-5, characterized in that, The extending direction of the anti-twist groove is inclined to the axial direction of the pole.

7. The top-attachable battery cover structure of claim 1, wherein The anti-twist groove is an arc-shaped groove.

8. The top-attachable battery cover structure of claim 7, wherein, ​ 9. The top-attached fixed battery top cover structure according to claim 7 or 8, characterized in that, ​ 10. The top-attach secure battery top cover structure of claim 1, wherein, The middle part of the top cover plate is provided with an explosion-proof hole, and an explosion-proof valve is installed on the explosion-proof hole. The explosion-proof valve is provided with cross-shaped scratches.

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