Extremely simple injection molding top cover structure of square battery

Abstract

The utility model discloses an extremely simple injection-molded top cover structure of a square battery, which relates to the technical field of batteries, and comprises a top cover sheet, a positive pole assembly, a negative pole assembly and a lower insulating plate, a positive pole mounting hole and a negative pole mounting hole are symmetrically formed at two ends of the top cover sheet, the positive pole assembly is welded on the positive pole mounting hole, and the negative pole assembly is welded on the negative pole mounting hole. The negative electrode assembly is welded on the negative electrode mounting hole, and a lower insulating plate is fixedly arranged below the top cover plate. According to the design, a larger space can be provided for the pole within the limited area of the top cover plate, so that the size of the pole can be expanded, the overcurrent capacity of the battery cell is improved, and the safety of the battery cell is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically a simplified injection-molded top cover structure for a square battery. Background Technology

[0002] With the development of new energy sources, batteries are increasingly used in energy storage and electric vehicles, and their market share is growing. This places increasingly stringent demands on the cost control of battery cells. Therefore, the top cover, a crucial component of battery cells, needs continuous technological innovation and cost reduction in its future development to promote the widespread adoption of batteries in energy storage and electric vehicles. Simultaneously, people are paying increasing attention to the charging speed of electric vehicles and the safety of power batteries. High-current-capacity battery cells can improve the charging speed of electric vehicles while also enhancing battery safety, thus expanding the application of new energy batteries in energy storage and electric vehicles and increasingly meeting people's expectations for battery efficiency and safety.

[0003] The existing technology "CN 218731344U A Square Battery Top Cover" requires two injection molding processes for the battery top cover. The multiple processes lead to a decrease in product yield and production efficiency, and an increase in production costs. The battery top cover has limited space, resulting in a small design capacity for overcurrent, which reduces safety when facing high charging rates and limits its application scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a simplified injection-molded top cover structure for a square battery to solve the problems mentioned above.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A simplified injection-molded top cover structure for a square battery includes a top cover plate 1, a positive electrode assembly 2, a negative electrode assembly 3, and a lower insulating plate 4. The top cover plate 1 has symmetrically arranged positive electrode mounting holes 11 and negative electrode mounting holes 12 at both ends. The positive electrode assembly 2 is welded to the positive electrode mounting holes 11, and the negative electrode assembly 3 is welded to the negative electrode mounting holes 12. The lower insulating plate 4 is fixedly disposed below the top cover plate 1. The positive electrode assembly 2 is composed of a positive electrode post 21, a first welding pressure ring 22, a first upper plastic 23, a first sealing ring 24, and a first welding pressure plate 25. The first sealing ring 24 is fitted at the bottom of the positive electrode post 21, the first upper plastic 23 is fitted at the middle of the positive electrode post 21, and the first welding pressure ring 22 is fitted at the top of the positive electrode post 21. The first upper plastic 23 is used to bond the first welding pressure ring 22 and the first sealing ring 24. The positive electrode assembly 2 has a sealing ring 24 and a positive electrode post 21. The first welding pressure ring 22 is used to press the first upper plastic 23 and the first sealing ring 24. The first welding pressure plate 25 is set at the bottom of the positive electrode assembly 2. The negative electrode assembly 3 is composed of a negative electrode post 31, a second welding pressure ring 32, a second upper plastic 33, a second sealing ring 34, and a second welding pressure plate 35. The second sealing ring 34 is fitted at the bottom of the negative electrode post 31, the second upper plastic 33 is fitted at the middle of the negative electrode post 31, and the second welding pressure ring 32 is fitted at the top of the negative electrode post 31. The second upper plastic 33 is used to bond the second welding pressure ring 32, the second sealing ring 34, and the negative electrode post 31. The second welding pressure ring 32 is used to press the second upper plastic 33 and the second sealing ring 34. The second welding pressure plate 35 is set at the bottom of the negative electrode assembly 3.

[0007] As a further embodiment of this utility model: the bottom of the first welding pressure ring 22 and the second welding pressure ring 32 are provided with multiple buckles, and the first welding pressure plate 25 and the second welding pressure plate 35 are respectively provided with openings corresponding to the buckles at the bottom of the first welding pressure ring 22 and the second welding pressure ring 32.

[0008] As a further embodiment of this utility model: both the first upper plastic 23 and the second upper plastic 33 are circular rings with a certain geometric shape in their cross-section.

[0009] As a further embodiment of this utility model: the first upper plastic 23 and the second upper plastic 33 are annular rings with irregular polygonal cross-sections.

[0010] As a further embodiment of this utility model: the bottom of the top cover plate 1 is designed with an undercut hole, and the lower insulating plate 4 is provided with a plastic post corresponding to the position of the undercut hole at the bottom of the top cover plate 1. The top cover plate 1 and the lower insulating plate 4 are assembled and fixed together by a hot melt process.

[0011] As a further embodiment of this utility model: the top cover plate 1 is provided with an explosion-proof hole 13 in the middle, an explosion-proof valve 131 is fixedly provided in the explosion-proof hole 13, and an explosion-proof patch 132 is fixedly provided above the explosion-proof valve 131.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In this utility model, by fixing the first welding plate 25 and the second welding plate 35 below the top cover plate 1, this design can provide more space for the positive electrode post 21 and the negative electrode post 31 within the limited area of ​​the top cover plate 1, thereby expanding the size of the electrode post. The larger the cross-sectional area of ​​the electrode post, the stronger the current carrying capacity, thereby improving the current carrying capacity of the battery cell, enabling the battery cell to overload excessive current, thereby improving the charging efficiency of the battery cell and ensuring the safety of the battery cell.

[0014] In this invention, by assembling the components into a positive electrode assembly 2 and a negative electrode assembly 3, and then laser welding the positive electrode assembly 2 and the negative electrode assembly 3 onto the top cover plate 1, it is possible to adapt to various top cover sizes and performances, thereby improving product flexibility. Attached Figure Description

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a three-dimensional component drawing of the present invention.

[0017] Figure 3 This is an enlarged view of the positive electrode component structure in this utility model;

[0018] Figure 4 This is an enlarged view of the negative electrode component structure in this utility model;

[0019] Figure 5 This is a top view of the present invention;

[0020] Figure 6 This is a bottom view of the present invention.

[0021] In the diagram: 1. Top cover plate; 11. Positive electrode mounting hole; 12. Negative electrode mounting hole; 13. Explosion-proof hole; 131. Explosion-proof valve; 132. Explosion-proof patch; 2. Positive electrode assembly; 21. Positive electrode post; 22. First welded pressure ring; 23. First upper plastic; 24. First sealing ring; 25. First welded pressure plate; 3. Negative electrode assembly; 31. Negative electrode post; 32. Second welded pressure ring; 33. Second upper plastic; 34. Second sealing ring; 35. Second welded pressure plate; 4. Lower insulating plate. Detailed Implementation

[0022] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6 In this embodiment of the utility model, a simplified injection-molded top cover structure for a square battery includes a top cover plate 1, a positive electrode assembly 2, a negative electrode assembly 3, and a lower insulating plate 4. The top cover plate 1 has symmetrical positive electrode mounting holes 11 and negative electrode mounting holes 12 at both ends. The positive electrode assembly 2 is welded to the positive electrode mounting holes 11, and the negative electrode assembly 3 is welded to the negative electrode mounting holes 12. The lower insulating plate 4 is fixedly disposed below the top cover plate 1. The positive electrode assembly 2 is composed of a positive electrode post 21, a first welding pressure ring 22, a first upper plastic 23, a first sealing ring 24, and a first welding pressure plate 25. The first sealing ring 24 is sleeved on the bottom of the positive electrode post 21 to ensure the sealing between the top cover 1 and the positive electrode post 21. The first upper plastic 23 is fitted onto the middle of the positive electrode post 21, and the first welding pressure ring 22 is fitted onto the top of the positive electrode post 21. The first upper plastic 23 is used to bond the first welding pressure ring 22, the first sealing ring 24 and the positive electrode post 21. The first welding pressure ring 22 is used to press the first upper plastic 23 and the first sealing ring 24. The first welding pressure plate 25 is set at the bottom of the positive electrode assembly 2. The negative electrode assembly 3 is composed of the negative electrode post 31, the second welding pressure ring 32, the second upper plastic 33, the second sealing ring 34 and the second welding pressure plate 35. The second sealing ring 34 is fitted onto the bottom of the negative electrode post 31 to ensure the sealing between the top cover 1 and the negative electrode post 31. The second upper plastic 33 is sleeved in the middle of the negative electrode post 31, and the second welding pressure ring 32 is sleeved on the top of the negative electrode post 31. The second upper plastic 33 is used to bond the second welding pressure ring 32, the second sealing ring 34 and the negative electrode post 31. The second welding pressure ring 32 is used to press the second upper plastic 33 and the second sealing ring 34. The second welding pressure plate 35 is set at the bottom layer of the negative electrode assembly 3.

[0024] The first welding ring 22 and the second welding ring 32 each have multiple snap-fits at their bottoms, and the first welding plate 25 and the second welding plate 35 each have openings corresponding to the snap-fits at the bottom of the first welding ring 22 and the second welding ring 32. The snap-fit ​​connection is easy to disassemble. When maintenance or replacement of the ring plates is required, they can be easily removed from the connecting components without damaging surrounding parts.

[0025] Among them, the first upper plastic 23 and the second upper plastic 33 are both rings with a certain geometric shape in cross section.

[0026] Among them, the first upper plastic 23 and the second upper plastic 33 are annular rings with irregular polygonal cross-sections.

[0027] The top cover plate 1 has a snap-fit ​​hole at its bottom, and the lower insulating plate 4 has plastic posts corresponding to the snap-fit ​​holes at the bottom of the top cover plate 1. The top cover plate 1 and the lower insulating plate 4 are assembled and fixed together by a hot-melt process. The hot-melt process only utilizes the inherent properties of the materials to achieve assembly, without the need for additional adhesives, solvents, fillers, or fasteners, thus simplifying the structure.

[0028] An explosion-proof hole 13 is provided between the positive and negative mounting holes. An explosion-proof valve 131 is fixedly installed inside the explosion-proof hole 13, and an explosion-proof patch 132 is fixedly installed above the explosion-proof valve 131. In the event of a short circuit, overcharge, overheating, or other dangerous events inside the battery, the explosion-proof valve 131 can quickly release the energy or pressure inside the battery to the outside, thereby preventing the battery from exploding.

[0029] After assembling the positive electrode post 21, the first welding ring 22, the first upper plastic liner 23, the first sealing ring 24, and the first welding plate 25, the positive electrode assembly 2 is formed by laser welding at the seam weld between the first welding ring 22 and the first welding plate 25 after being pressed downwards in the Z direction by a tooling. Similarly, after assembling the negative electrode post 31, the second welding ring 32, the second upper plastic liner 33, the second sealing ring 34, and the second welding plate 35, the negative electrode assembly 3 is formed by laser welding at the seam weld between the second welding ring 32 and the second welding plate 35 after being pressed downwards in the Z direction by a tooling. Then, the negative electrode assembly 3 is formed by secondary welding at the seam junction between the first welding plate 25 at the bottom of the positive electrode assembly 2 and the top cover plate 1 and the lower insulating plate 4. Similarly, the negative electrode assembly 3 is formed by secondary welding at the seam junction between the second welding plate 35 at the bottom of the negative electrode assembly 3 and the top cover plate 1 and the lower insulating plate 4. Secondary welding fixes the top cover plate 1, positive electrode component 2 and negative electrode component 3 together, ensuring that the product dimensions are qualified. This not only guarantees the electrical performance of the product, but also eliminates the need for secondary injection molding, improving production efficiency and yield, reducing material costs, and thus reducing the overall product cost.

[0030] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A simplified injection-molded top cover structure for a square battery, comprising a top cover sheet (1), a positive electrode assembly (2), a negative electrode assembly (3), and a lower insulating plate (4), characterized in that: The top cover plate (1) has symmetrically provided positive electrode mounting holes (11) and negative electrode mounting holes (12) at both ends. The positive electrode assembly (2) is welded to the positive electrode mounting hole (11), and the negative electrode assembly (3) is welded to the negative electrode mounting hole (12). A lower insulating plate (4) is fixedly provided below the top cover plate (1). The positive electrode assembly (2) is composed of a positive electrode post (21), a first welding pressure ring (22), a first upper plastic (23), a first sealing ring (24), and a first welding pressure plate (25). The first sealing ring (24) is fitted at the bottom of the positive electrode post (21), the first upper plastic (23) is fitted at the middle of the positive electrode post (21), and the first welding pressure ring (22) is fitted at the top of the positive electrode post (21). The first upper plastic (23) is used to bond the first welding pressure ring (22), the first sealing ring (24), and the positive electrode post (21). The first welding plate (25) is used to press the first upper plastic (23) and the first sealing ring (24), and is located at the bottom of the positive electrode assembly (2); the negative electrode assembly (3) is composed of a negative electrode post (31), a second welding ring (32), a second upper plastic (33), a second sealing ring (34), and a second welding plate (35). The second sealing ring (34) is fitted at the bottom of the negative electrode post (31), the second upper plastic (33) is fitted at the middle of the negative electrode post (31), and the second welding ring (32) is fitted at the top of the negative electrode post (31). The second upper plastic (33) is used to bond the second welding ring (32), the second sealing ring (34), and the negative electrode post (31). The second welding ring (32) is used to press the second upper plastic (33) and the second sealing ring (34). The second welding plate (35) is located at the bottom of the negative electrode assembly (3).

2. The simplified injection-molded top cover structure for a square battery according to claim 1, characterized in that: The bottom of the first welding pressure ring (22) and the second welding pressure ring (32) are provided with multiple buckles, and the first welding pressure plate (25) and the second welding pressure plate (35) are respectively provided with openings corresponding to the buckles at the bottom of the first welding pressure ring (22) and the second welding pressure ring (32).

3. The simplified injection-molded top cover structure for a square battery according to claim 1, characterized in that: Both the first upper plastic (23) and the second upper plastic (33) are circular rings with a certain geometric shape in cross section.

4. The simplified injection-molded top cover structure for a square battery according to claim 3, characterized in that: The first upper plastic (23) and the second upper plastic (33) are rings with irregular polygonal cross-sections.

5. The simplified injection-molded top cover structure for a square battery according to claim 1, characterized in that: The bottom of the top cover plate (1) is designed with a snap-in hole, and the lower insulating plate (4) is provided with a plastic post corresponding to the position of the snap-in hole at the bottom of the top cover plate (1). The top cover plate (1) and the lower insulating plate (4) are assembled and fixed together by a hot-melt process.

6. The simplified injection-molded top cover structure for a square battery according to claim 1, characterized in that: The top cover plate (1) is provided with an explosion-proof hole (13) in the middle, and an explosion-proof valve (131) is fixedly installed inside the explosion-proof hole (13). An explosion-proof patch (132) is fixedly installed above the explosion-proof valve (131).

Images