Injection molding battery top cover structure

Abstract

The utility model discloses an injection molding battery top cover structure which comprises a base plate, two pole columns are symmetrically arranged on the base plate, a welding ring is welded on the base plate, a plurality of through holes are formed in the welding ring, a sealing ring is arranged on an inner ring of the welding ring, the sealing ring is sleeved on the pole columns, and molten plastic is injected between the base plate and the pole columns through an injection molding process to form an injection molding covered edge. And the substrate, the welding ring, the sealing ring and the pole are fixed into an integral structure by the injection molding covered edge. According to the injection molding battery top cover structure, the substrate, the welding ring, the sealing ring and the pole can be fixed into a whole through the injection molding edge covering structure formed through the injection molding process, and compared with an existing welding fixing structure, the connecting structure can enhance the structural stability and the sealing performance of the top cover, so that the application environment of the battery is wider.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an injection-molded battery top cover structure. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy. It contains an electrolyte solution and metal electrodes, forming a cup, tank, or other container or composite container that generates an electric current. It has a positive and a negative electrode. The main performance parameters of a battery are electromotive force, capacity, specific energy, and resistance. Using batteries as an energy source provides a stable voltage, stable current, long-term stable power supply, and minimal susceptibility to external influences. Batteries are simple in structure, portable, easy to charge and discharge, unaffected by external climate and temperature, and offer stable and reliable performance, playing a significant role in various aspects of modern life.

[0003] With the development of lithium batteries, the technical requirements for battery top covers have become increasingly stringent, especially regarding the safety of the battery cells. The structure and stability of the top cover are crucial to battery safety. Therefore, improving the stability of the top cover structure and the overall safety of the battery has become a key focus of the development of power lithium battery technology. Existing lithium battery top cover structures typically use traditional welding techniques to fix various components together. However, this connection method can lead to poor structural stability and weak sealing of the top cover when the battery is subjected to external forces or extreme conditions. Utility Model Content

[0004] This invention provides an injection-molded battery top cover structure that can solve the problems of poor structural stability and weak sealing of the top cover mentioned in the background art.

[0005] A top cover structure for an injection-molded battery includes: a substrate, wherein two electrode posts are symmetrically arranged on the substrate;

[0006] The substrate is welded with a welding ring, and the welding ring has several through holes;

[0007] A sealing ring is provided in the inner ring of the welding ring. The sealing ring is sleeved on the pole post. Molten plastic is injected between the substrate and the pole post through an injection molding process to form an injection molding edging. The injection molding edging fixes the substrate, the welding ring, the sealing ring and the pole post into an integral structure.

[0008] Preferably, the substrate has a positioning hole and a stepped positioning groove concentric with the positioning hole.

[0009] Preferably, a limiting hole is provided in the positioning groove.

[0010] Preferably, the sealing ring has a receiving groove at the top and a positioning ring at the bottom, the positioning ring being embedded in the positioning hole.

[0011] Preferably, the pole post is provided with an outer ring, which overlaps the receiving groove.

[0012] Preferably, the pole post has a groove.

[0013] Preferably, the bottom of the welding ring is provided with a snap-fit ​​portion.

[0014] Preferably, the snap-fit ​​portion is embedded in the limiting hole.

[0015] Preferably, a stop frame is welded to the bottom of the substrate, and a connecting piece is welded to the bottom of the pole post.

[0016] Preferably, an explosion-proof valve is welded onto the substrate, and an explosion-proof patch is disposed above the explosion-proof valve.

[0017] The beneficial effects of this utility model are:

[0018] This injection-molded battery top cover structure, through the injection molding process, forms an injection-molded edge structure that can fix the substrate, welding ring, sealing ring, and terminal post into one piece. Compared with the existing welding fixing structure, this connection structure can enhance the structural stability and sealing of the top cover, making the battery applicable to a wider range of environments. Attached Figure Description

[0019] Figure 1 A schematic diagram of an injection-molded battery top cover structure provided by this utility model;

[0020] Figure 2 A cross-sectional view of an injection-molded battery top cover structure provided by this utility model;

[0021] Figure 3 An exploded view of an injection-molded battery top cover structure provided by this utility model;

[0022] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 5 for Figure 3 Schematic diagram of the middle substrate;

[0024] Figure 6 for Figure 3 Schematic diagram of the structure of the central pole;

[0025] Figure 7 for Figure 3 Schematic diagram of the structure of the middle welding ring;

[0026] Figure 8 for Figure 3 Top view of the central sealing ring;

[0027] Figure 9 for Figure 3 Bottom view of the central sealing ring.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Base plate; 11. Positioning hole; 12. Positioning groove; 13. Limiting hole; 2. Stop bracket; 3. Explosion-proof valve; 4. Explosion-proof patch; 5. Pole post; 51. Groove; 52. Outer ring; 6. Injection molding edge wrap; 7. Welding ring; 71. Through hole; 72. Snap-fit ​​part; 8. Sealing ring; 81. Receiving groove; 82. Positioning ring; 9. Connecting piece. Detailed Implementation

[0030] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0031] A battery is a device that converts chemical energy into electrical energy. It contains an electrolyte solution and metal electrodes, forming a cup, tank, or other container or composite container that generates an electric current. It has a positive and a negative electrode. The main performance parameters of a battery are electromotive force, capacity, specific energy, and resistance. Using batteries as an energy source provides a stable voltage, stable current, long-term stable power supply, and minimal susceptibility to external influences. Batteries are simple in structure, portable, easy to charge and discharge, unaffected by external climate and temperature, and offer stable and reliable performance, playing a significant role in various aspects of modern life.

[0032] With the development of lithium batteries, the technical requirements for battery top covers have become increasingly stringent, especially regarding the safety of the battery cells. The structure and stability of the top cover are crucial to battery safety. Therefore, improving the stability of the top cover structure and the overall safety of the battery has become a key focus of the development of power lithium battery technology. Existing lithium battery top cover structures typically use traditional welding techniques to fix various components together. However, this connection method can lead to poor structural stability and weak sealing of the top cover when the battery is subjected to external forces or extreme conditions.

[0033] like Figures 1-5 As shown, this utility model proposes an injection-molded battery top cover structure, including: a substrate 1, the substrate 1 having a positioning hole 11 and a stepped positioning groove 12 concentric with the positioning hole 11. A limiting hole 13 is formed in the positioning groove 12.

[0034] A stop bracket 2 is welded to the bottom of the substrate 1. Two pole posts 5 are symmetrically arranged on the substrate 1, namely the positive pole post and the negative pole post. An explosion-proof valve 3 is arranged between the two pole posts 5 and is welded to the substrate 1. An explosion-proof patch 4 is arranged above the explosion-proof valve 3 and is attached to the corresponding position hole on the substrate 1 of the explosion-proof valve 3. A connecting piece 9 is also welded to the bottom of the pole post 5.

[0035] Among them, such as Figure 6 As shown, the pole post 5 is provided with an outer ring 52, and several grooves 51 are provided above the outer ring 52.

[0036] like Figure 4 , Figure 7 As shown, a welding ring 7 is welded to the substrate 1, and the welding ring 7 has several through holes 71. The bottom of the welding ring 7 is provided with multiple snap-fit ​​parts 72, which are embedded in the limiting holes 13 of the substrate 1, and the shape and size of the snap-fit ​​parts 72 are adapted to the limiting holes 13.

[0037] like Figure 4 , Figures 8-9 As shown, a sealing ring 8 is provided on the inner ring of the welding ring 7, and the sealing ring 8 is sleeved on the pole post 5. A receiving groove 81 is provided at the top of the sealing ring 8, and a positioning ring 82 is provided at the bottom. The positioning ring 82 is embedded in the positioning hole 11 in the substrate 1, and the outer diameter of the positioning ring 82 matches the inner diameter of the positioning hole 11. The outer ring 52 of the pole post 5 overlaps the receiving groove 81, so that the substrate 1 can support the pole post 5 while being sealed by the sealing ring 8.

[0038] In this application, an injection mold is used to inject molten plastic between the substrate 1 and the pole piece 5 through an injection molding process, forming an injection-molded edging 6. The injection-molded edging 6 fixes the substrate 1, the welding ring 7, the sealing ring 8, and the pole piece 5 into an integral structure.

[0039] Specifically, the substrate 1 and welding ring 7 are welded together. Sealing rings 8 are then fitted onto the two poles 5 and placed at the positioning holes 11 on the substrate 1 before proceeding to the injection molding process. During injection molding, the injection mold compresses the sealing rings 8, causing them to deform and achieve a sealing effect. Molten plastic is then injected into the injection mold. The molten plastic flows through the through holes 71 of the welding ring 7 towards the poles 5. During this flow, the molten plastic connects the substrate 1, welding ring 7, sealing ring 8, and poles 5 together. After molding, the molten plastic forms the injection molding edge 6. The stop bracket 2 is connected to the substrate 1 via hot melt welding. Explosion-proof patches 4 are attached to the upper surface of the substrate 1 corresponding to the position holes of the explosion-proof valve 3. Finally, two connecting pieces 9 (positive and negative connecting pieces) are welded to the corresponding poles 5 to form a complete cover plate.

[0040] In this embodiment, the injection-molded edge 6 structure formed by the injection molding process can fix the substrate 1, welding ring 7, sealing ring 8 and electrode post 5 into one piece. Compared with the existing welding fixing structure, this connection structure can enhance the structural stability and sealing of the top cover, making the battery applicable to a wider range of environments.

[0041] Understandably, the molten plastic passes through the through-hole 71 in the welding ring 7, which effectively enhances the strength of the final injection molding edge 6 and increases the torque of the electrode post 5 after injection molding. The groove 51 on the side of the electrode post 5 serves as a receiving space to accommodate a portion of the molten plastic, facilitating the subsequent injection molding edge 6 to secure the electrode post 5 and prevent it from loosening during use.

[0042] The injection-molded battery top cover has a simple structure, low cost, and is lighter, making it easier to manufacture and transport.

[0043] Working Principle: The injection-molded edge 6 structure, formed through injection molding, can fix the substrate 1, welding ring 7, sealing ring 8, and pole 5 into one unit. Specifically, the substrate 1 and welding ring 7 are welded together, and the sealing ring 8 is fitted onto the two poles 5 and placed at the positioning hole 11 of the substrate 1 before proceeding to the subsequent injection molding process. During injection molding, the injection mold compresses the sealing ring 8, causing it to deform and achieve a sealing effect. Molten plastic is then injected into the injection mold, flowing through the through hole 71 of the welding ring 7 to the pole 5. During the flow, the molten plastic connects the substrate 1, welding ring 7, sealing ring 8, and pole 5 into one unit, forming the injection-molded edge 6 after molding. The stop bracket 2 is connected to the substrate 1 by hot melt welding, and the explosion-proof patch 4 is pasted on the upper surface of the substrate 1 corresponding to the position hole of the explosion-proof valve 3. Finally, the two connecting pieces 9 are welded to the corresponding poles 5 to form a complete cover plate.

[0044] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A top cover structure for an injection-molded battery, characterized in that, include: A substrate (1) having two pole posts (5) symmetrically arranged on it; The substrate (1) is welded with a welding ring (7), and the welding ring (7) has several through holes (71); The inner ring of the welding ring (7) is provided with a sealing ring (8), which is sleeved on the pole post (5). Molten plastic is injected between the substrate (1) and the pole post (5) through injection molding process to form an injection molding edging (6). The injection molding edging (6) fixes the substrate (1), the welding ring (7), the sealing ring (8) and the pole post (5) into an integral structure.

2. The injection-molded battery top cover structure as described in claim 1, characterized in that, The substrate (1) has a positioning hole (11) and a stepped positioning groove (12) concentric with the positioning hole (11).

3. The injection-molded battery top cover structure as described in claim 2, characterized in that, A limiting hole (13) is provided in the positioning groove (12).

4. The injection-molded battery top cover structure as described in claim 3, characterized in that, The sealing ring (8) has a receiving groove (81) at the top and a positioning ring (82) at the bottom, which is embedded in the positioning hole (11).

5. The injection-molded battery top cover structure as described in claim 4, characterized in that, The pole post (5) is provided with an outer ring (52), which overlaps the receiving groove (81).

6. The injection-molded battery top cover structure as described in claim 5, characterized in that, The pole post (5) has a groove (51).

7. The injection-molded battery top cover structure as described in claim 3, characterized in that, The bottom of the welding ring (7) is provided with a snap-fit ​​part (72).

8. The injection-molded battery top cover structure as described in claim 7, characterized in that, The snap-fit ​​portion (72) is embedded in the limiting hole (13).

9. The injection-molded battery top cover structure as described in claim 1, characterized in that, A stop frame (2) is welded to the bottom of the substrate (1), and a connecting piece (9) is welded to the bottom of the pole (5).

10. The injection-molded battery top cover structure as described in claim 1, characterized in that, The substrate (1) is welded with an explosion-proof valve (3), and an explosion-proof patch (4) is provided above the explosion-proof valve (3).

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