Square battery extremely simple injection molding top cover plate structure

Abstract

The utility model relates to the technical field of top cover plate structures, and discloses a square battery extremely simple injection molding top cover plate structure which comprises a top cover piece, a lower insulating plate is arranged at the bottom of the top cover piece, an anti-explosion valve is arranged in the middle of the top cover piece, and a protective patch is arranged on the top surface of the anti-explosion valve. According to the utility model, the upper plastic is formed after the independently stamped welding ring is subjected to encapsulation injection molding, and then the upper plastic is welded after being assembled with the pole, so that the assembly process is reduced, the yield is improved, the redundant material cost is also reduced, and the overall cost is reduced; according to the technical scheme, on the premise that the space is not changed, the larger the size of the externally-expanded pole and the sectional area of the pole are, the stronger the overcurrent capacity is, so that the overcurrent capacity of the battery cell is improved, the battery cell can be overloaded with overlarge current, meanwhile, the charging efficiency of the battery cell can be improved, and the safety of the battery cell is ensured.

Description

Technical Field

[0001] The utility model application relates to the technical field of injection-molded top cover plate structures, specifically to a minimalist injection-molded top cover plate structure for a square battery. Background Art

[0002] With the development of new energy, the application of batteries in energy storage and power vehicles is becoming more and more popular, and the market share is increasing. This has led to increasingly strict control over the cost of battery cells. Batteries with large overcurrent capacity can increase the charging speed of power vehicles while also improving battery safety, thereby making new energy batteries more and more widely used in the fields of energy storage and power vehicles. As an important component of the battery cell, the quality of the battery top cover is directly related to the overall quality of the battery cell.

[0003] Conventional minimalist injection-molded top covers generally have two design directions. One is that the welding ring is stamped from the top cover sheet, and then assembled with the pole by riveting before injection molding; the other is that the welding ring is stamped separately and welded to the top cover sheet, and then assembled with the pole before injection molding. Both require an intermediate plastic part as a dielectric, and both require a final injection molding process to make the finished product. Two injection molding processes are required. The multiple processes affect the yield and production efficiency, and the cost remains high. In addition, the two plastic parts of the positive or negative pole have the same effect on the top cover plate. The existence of redundant design makes the process more complicated, reduces the assembly yield, and increases the product cost. At the same time, the top cover has a small overcurrent capacity when designed in a limited space. This battery cell is not suitable for scenarios where charging speed is fast and safe. Summary of the Invention

[0004] In order to solve the problem that the existing square battery minimalist injection molded top cover plate structure has too complicated a process and low yield rate during processing, the utility model provides a square battery minimalist injection molded top cover plate structure to solve the above problem.

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

[0006] A minimalist injection-molded top cover plate structure for a square battery comprises a top cover plate, a lower insulating plate being provided at the bottom of the top cover plate, an explosion-proof valve being provided in the middle of the top cover plate, and a protective patch being provided on the top surface of the explosion-proof valve, a positive electrode sealing ring and a negative electrode sealing ring being symmetrically provided on the top surface of the top cover plate, a positive electrode column being provided on the top surface of the positive electrode sealing ring, and a positive electrode upper plastic being provided on the top surface of the positive electrode column, a positive electrode welding ring being fixedly mounted on the top surface of the positive electrode upper plastic, a negative electrode column being provided on the top surface of the negative electrode sealing ring, and a negative electrode upper plastic being provided on the top surface of the negative electrode upper plastic, and a negative electrode welding ring being fixedly mounted on the top surface of the negative electrode upper plastic.

[0007] Furthermore, a plurality of inverted holes are provided at the bottom of the top cover sheet, a plurality of plastic columns are fixed equidistantly on the top of the negative electrode sealing ring, and the plastic columns are inserted into the inverted holes, and the top cover sheet and the lower insulating plate are assembled and fixed by a hot melt process.

[0008] Furthermore, the positive electrode sealing ring and the negative electrode sealing ring, the positive electrode column, the positive electrode upper plastic and the positive electrode welding ring, the negative electrode column, the negative electrode upper plastic and the negative electrode welding ring are sequentially placed on the top cover sheet and assembled and then fixed by seam welding.

[0009] Furthermore, positioning blocks are symmetrically provided on the top surfaces of the positive electrode column and the negative electrode column, and positioning grooves cooperating with the positioning blocks are symmetrically provided inside the plastic on the positive electrode and the plastic on the negative electrode.

[0010] Furthermore, the upper outer surfaces of the positive electrode plastic and the negative electrode plastic are symmetrically fixed with limiting blocks, and the inner top surfaces of the positive electrode welding ring and the negative electrode welding ring are provided with limiting grooves that cooperate with the limiting blocks.

[0011] Furthermore, the plastic on the positive electrode is overmolded with the negative electrode welding ring to form an injection-molded component, and the plastic on the negative electrode is overmolded with the negative electrode welding ring to form an injection-molded component.

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

[0013] 1. In the present invention, a separately stamped welding ring is overmolded and then formed into an upper plastic, which is then assembled with the pole and welded. This reduces the number of assembly steps, thereby improving the yield rate, reducing the cost of unnecessary materials, and reducing the overall cost. The pole can be expanded without changing the space. The larger the cross-sectional area of ​​the pole, the stronger the overcurrent capacity, thereby improving the overcurrent capacity of the battery cell, allowing the battery cell to be overloaded with excessive current, and at the same time improving the charging efficiency of the battery cell and ensuring the safety of the battery cell.

[0014] 2. In the present invention, by reducing the two injection molding processes of the plastic on the positive and negative electrodes of the dielectric to one injection molding process, the production efficiency and yield are improved, the material cost is reduced, and the overall product cost is reduced. The problem of the extremely simple injection molding top cover plate structure of the square battery being too complicated and having a low yield during processing is solved. At the same time, the overcurrent capacity of the battery cell is also improved, thereby improving the charging efficiency of the battery cell, enhancing the safety of the battery cell, and improving the adaptability of the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic front view of a top cover structure according to an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A bottom view schematic diagram of the top cover plate structure in the embodiment shown;

[0018] Figure 3 yes Figure 1 A schematic front view of the split structure of the top cover plate in the embodiment shown;

[0019] Figure 4 yes Figure 1 A bottom view schematic diagram of the split structure of the top cover plate in the embodiment shown;

[0020] Figure 5 yes Figure 1 Schematic diagram of the front cross-section of the split local structure of the top cover plate in the embodiment shown.

[0021] The meanings of the reference numerals in the figure are: 1. Top cover; 2. Lower insulating plate; 3. Explosion-proof valve; 4. Protective patch; 5. Positive electrode sealing ring; 6. Negative electrode sealing ring; 7. Positive electrode column; 8. Negative electrode column; 9. Positive electrode upper plastic; 10. Negative electrode upper plastic; 11. Positive electrode welding ring; 12. Negative electrode welding ring. DETAILED DESCRIPTION

[0022] In order to make the purpose, features, and advantages of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] Reference Figure 1 、 Figure 2 and Figure 4A square battery minimalist injection molded top cover structure includes a top cover sheet 1, a lower insulating plate 2 is provided at the bottom of the top cover sheet 1, a plurality of inverted holes are provided at the bottom of the top cover sheet 1, a plurality of plastic columns are fixed equidistantly on the top of the negative electrode sealing ring 6, and the plastic columns are inserted into the inverted holes, the top cover sheet 1 and the lower insulating plate 2 are assembled and fixed by a hot melt process, an explosion-proof valve 3 is provided in the middle of the top cover sheet 1, and a protective patch 4 is provided on the top surface of the explosion-proof valve 3, a positive electrode sealing ring 5 and a negative electrode sealing ring 6 are symmetrically provided on the top surface of the top cover sheet 1, and a positive electrode sealing ring 6 is provided on the top surface of the top cover sheet 1. A positive electrode column 7 is provided on the top surface of the sealing ring 5, and a positive electrode upper plastic 9 is provided on the top surface of the positive electrode column 7. A positive electrode welding ring 11 is fixed to the top surface of the positive electrode upper plastic 9. A negative electrode column 8 is provided on the top surface of the negative electrode sealing ring 6. A negative electrode upper plastic 10 is provided on the top surface of the negative electrode column 8. A negative electrode welding ring 12 is fixed to the top surface of the negative electrode upper plastic 10. The positive electrode upper plastic 9 is formed by overmolding with the negative electrode welding ring 12 to form an injection-molded component, and the negative electrode upper plastic 10 is formed by overmolding with the negative electrode welding ring 12 to form an injection-molded component.

[0024] Specifically, after the positive electrode welding ring 11 and the negative electrode welding ring 12 are assembled with the top cover sheet 1, when the tooling presses the positive electrode column 7, the negative electrode column 8 and the positive electrode welding ring 11 and the negative electrode welding ring 12 down in the Z direction to the limit, the positive electrode welding ring 11 and the negative electrode welding ring 12 are welded to the top cover sheet 1 on the front side of the top cover sheet 1 through a laser welding process. When the spatial structure is insufficient, the size of the pole is increased, the cross-sectional area of ​​the pole is increased, thereby increasing the current capacity of the cover plate, improving the charging rate and safety of this battery cell, and thus improving the adaptability of this battery cell.

[0025] As an optimization solution, Figure 3 and Figure 5 As shown, the positive electrode sealing ring 5 and the negative electrode sealing ring 6, the positive electrode column 7, the positive electrode plastic 9 and the positive electrode welding ring 11, the negative electrode column 8, the negative electrode plastic 10 and the negative electrode welding ring 12 are placed on the top cover sheet 1 in sequence for assembly and then seam welding and fixing. The positive electrode column 7 and the negative electrode column 8 are symmetrically provided with positioning blocks on the top surfaces, and the positive electrode plastic 9 and the negative electrode plastic 10 are symmetrically provided with positioning grooves that cooperate with the positioning blocks. The upper outer surfaces of the positive electrode plastic 9 and the negative electrode plastic 10 are symmetrically fixed with limiting blocks, and the inner top surfaces of the positive electrode welding ring 11 and the negative electrode welding ring 12 are provided with limiting grooves that cooperate with the limiting blocks.

[0026] Specifically, the positive electrode welding ring 11 and the negative electrode welding ring 12 are seam-welded to the top cover sheet 1 by pressing in the Z direction to ensure that the product size is qualified and the sealing performance of the positive electrode column 7 and the negative electrode column 8 is satisfactory. This can not only ensure the electrical performance of the product, but also eliminate the need for secondary injection molding. During installation, when the plastic 9 on the positive electrode is sleeved on the positive electrode column 7, the positioning groove is sleeved on the positioning block, and when the positive electrode welding ring 11 is sleeved on the plastic 9 on the positive electrode, the limiting groove is sleeved on the limiting block to engage.

[0027] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and scope of the appended claims are intended to be included herein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0028] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A minimalist injection-molded top cover structure for a square battery, characterized by: The invention comprises a top cover sheet (1), wherein a lower insulating plate (2) is provided at the bottom of the top cover sheet (1), an explosion-proof valve (3) is provided in the middle of the top cover sheet (1), and a protective patch (4) is provided on the top surface of the explosion-proof valve (3), a positive electrode sealing ring (5) and a negative electrode sealing ring (6) are symmetrically provided on the top surface of the top cover sheet (1), a positive electrode column (7) is provided on the top surface of the positive electrode sealing ring (5), and a positive electrode upper plastic (9) is provided on the top surface of the positive electrode column (7), and a positive electrode welding ring (11) is fixedly mounted on the top surface of the positive electrode upper plastic (9), a negative electrode column (8) is provided on the top surface of the negative electrode column (8), and a negative electrode upper plastic (10) is fixedly mounted on the top surface of the negative electrode upper plastic (10), and a negative electrode welding ring (12) is fixedly mounted on the top surface of the negative electrode upper plastic (10).

2. The minimalist injection-molded top cover structure for a prismatic battery according to claim 1, characterized in that: The bottom of the top cover sheet (1) is provided with a plurality of undercut holes, the top of the negative electrode sealing ring (6) is fixed with a plurality of plastic columns at equal intervals, and the plastic columns are inserted into the undercut holes, and the top cover sheet (1) and the lower insulating plate (2) are assembled and fixed by a hot melt process.

3. The minimalist injection-molded top cover structure for a prismatic battery according to claim 1, characterized in that: The positive electrode sealing ring (5), the negative electrode sealing ring (6), the positive electrode column (7), the positive electrode upper plastic (9), the positive electrode welding ring (11), the negative electrode column (8), the negative electrode upper plastic (10), and the negative electrode welding ring (12) are sequentially placed on the top cover sheet (1), assembled, and then fixed by seam welding.

4. The minimalist injection-molded top cover structure for a prismatic battery according to claim 1, characterized in that: Positioning blocks are symmetrically provided on the top surfaces of the positive pole column (7) and the negative pole column (8), and positioning grooves cooperating with the positioning blocks are symmetrically provided inside the positive pole upper plastic (9) and the negative pole upper plastic (10).

5. The minimalist injection-molded top cover structure for a prismatic battery according to claim 1, characterized in that: The upper outer surfaces of the positive electrode plastic (9) and the negative electrode plastic (10) are both symmetrically fixed with limiting blocks, and the inner top surfaces of the positive electrode welding ring (11) and the negative electrode welding ring (12) are provided with limiting grooves that cooperate with the limiting blocks.

6. The minimalist injection-molded top cover structure for a prismatic battery according to claim 1, characterized in that: The plastic on the positive electrode (9) is formed into an injection molded component by overmolding with the negative electrode welding ring (12), and the plastic on the negative electrode (10) is formed into an injection molded component by overmolding with the negative electrode welding ring (12).

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