Square battery extremely simple top cover plate structure
The assembly of the press ring and the pole column by flip-rigging method solves the problems of burns and low welding yields of the square battery minimalist top cover structure during welding, and achieves improvement of sealing performance and cost reduction.
Patent Information
- Application Number
- CN202421471883.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The existing square battery minimalist top cover structure is prone to burn parts when assembled and welding, and the welding time will cause internal gas trapping, reducing welding yield.
The flip-rigging method is adopted to form a press ring assembly after the pressure ring and the pole column is injection molded through glue and then assembled with the pole column and flip-rigging to ensure sealing performance and avoid secondary welding.
It improves the sealing performance and welding yield of the battery cover plate, reduces the overall cost, and avoids the problem of burns in parts.
Smart Images
Figure CN223092966U_ABST
Abstract
Description
Technical Field
[0001] The present utility model application relates to the technical field of top cover plate structures, and specifically to a minimalist top cover plate structure for square batteries. Background Art
[0002] With the development of new energy, the application of batteries in the fields of energy storage and electric vehicles has become more and more popular, and the market inventory has become higher and higher. This has also made the control of the cost of battery cells more and more strict. As an important component in the battery cell, the sealing performance and safety of the top cover plate are directly related to the quality of the battery cell.
[0003] Currently, another conventional minimalist top cover on the market uses hollow positive and negative posts. Through the assembly with the pressure ring and the upper plastic, under the Z-direction pressure, the pressure ring and the post are cooperated and then seam welded to form a finished product. Although to a certain extent, the raw material costs of the positive and negative posts are reduced, for the clearance fit between such a pressure ring and a post, during laser welding, it is easy to pass through the clearance in the welding area to reach the bottom and irradiate on the accessories that have no relation to it, thus burning out the upper plastic and affecting the performance. At the same time, during the long welding time, internal trapped air will also be formed, reducing the welding yield rate of this process. Summary of the Invention
[0004] In order to solve the problem that the existing minimalist top cover plate structure of square batteries is prone to cause part burning during assembly and welding, the present utility model provides a minimalist top cover plate structure for square batteries to solve the above problems.
[0005] To achieve the above object, the present utility model provides the following technical solutions:
[0006] A minimalist top cover plate structure for square batteries, including a top cover sheet. An explosion-proof valve is arranged at the center position of the top cover sheet, and a protective sticker is fixed on the top of the explosion-proof valve. Positive and negative posts are arranged on the top surface of the top cover sheet. A positive pressure ring is sleeved on the top surface of the positive post, and a positive upper plastic encapsulation part is sleeved on the positive pressure ring. A negative pressure ring is sleeved on the top surface of the negative post, and a negative upper plastic encapsulation part is sleeved on the negative pressure ring. A lower plastic is fixed at the bottom of the top cover sheet.
[0007] Furthermore, both the positive upper plastic encapsulation part and the negative upper plastic encapsulation part are injection-molded inserts formed by encapsulating and injection-molding the positive pressure ring and the negative pressure ring. The negative post includes a negative post-aluminum and a negative post-copper.
[0008] Furthermore, the positive pressure ring is an injection-molded insert formed after the positive upper plastic encapsulation part is encapsulating and injection-molded. After injection molding, the positive upper plastic encapsulation part and the positive pressure ring are a positive injection-molded assembly. The negative pressure ring is an injection-molded insert formed after the negative upper plastic encapsulation part is encapsulating and injection-molded. After injection molding, the negative pressure ring and the negative upper plastic encapsulation part are a negative injection-molded assembly.
[0009] Further, fixing holes adapted to the positive electrode post and the negative electrode post are formed inside both the top cover sheet and the lower plastic, and sealing rings are fixed in two fixing holes inside the lower plastic.
[0010] Further, a plurality of through holes are equidistantly formed inside both the positive electrode upper plastic overmolding and the negative electrode upper plastic overmolding, and perforated columns adapted to the positive electrode upper plastic overmolding and the negative electrode upper plastic overmolding are provided on both the positive electrode pressing ring and the negative electrode pressing ring.
[0011] Further, after the sealing rings, the positive electrode post and the negative electrode post, the lower plastic, the top cover sheet, the positive electrode pressing ring and the negative electrode pressing ring, the positive electrode upper plastic overmolding and the negative electrode upper plastic overmolding are sequentially placed for assembly, downward pressure in the Z direction is applied through a riveting die for flanging riveting.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] In the present utility model, by changing the welding of the pressing ring and the pole post to the flanging riveting method, the separately stamped pressing ring is subjected to overmolding and injection molding to form a pressing ring assembly, and then after being assembled with the pole post, flanging riveting is performed. The pressing ring assembly is fixed to the top cover sheet and the pole post through pressing in the Z direction, ensuring the qualified product size and the sealing performance of the positive and negative electrode posts, which can not only ensure the electrical performance of the product, but also eliminate the need for secondary welding, thereby improving the yield rate and reducing the overall cost, and solving the problem that the existing minimalist top cover plate structure of the square battery is prone to part burning during assembly welding. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.
[0015] Figure 1 is a front view schematic diagram of a minimalist top cover plate structure according to an embodiment of the present application;
[0016] Figure 2 is Figure 1 a bottom view schematic diagram of the minimalist top cover plate structure in the illustrated embodiment;
[0017] Figure 3 is Figure 1 a front view schematic diagram of the split structure of the minimalist top cover plate in the illustrated embodiment;
[0018] Figure 4 is Figure 1 a bottom view schematic diagram of the split structure of the minimalist top cover plate in the illustrated embodiment;
[0019] Figure 5 Yes Figure 1 Front elevation sectional view of the partial structure of the minimalist top cover plate in the illustrated embodiment.
[0020] Meanings of the reference numerals in the figure: 1. Top cover sheet; 2. Lower plastic; 3. Sealing ring; 4. Explosion-proof valve; 5. Protective sticker; 6. Positive upper plastic encapsulation part; 7. Negative upper plastic encapsulation part; 8. Positive terminal; 9. Negative terminal; 10. Positive compression ring; 11. Negative compression ring. Detailed implementation manners
[0021] To make the application purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.
[0022] Referring to Figure 1 and Figure 2 and Figure 4 , a minimalist top cover plate structure of a square battery includes a top cover sheet 1, an explosion-proof valve 4 is arranged at the center position of the top cover sheet 1, and a protective sticker 5 is fixed on the top of the explosion-proof valve 4. A positive terminal 8 and a negative terminal 9 are arranged on the top surface of the top cover sheet 1. A positive compression ring 10 is sleeved on the top surface of the positive terminal 8, and a positive upper plastic encapsulation part 6 is sleeved on the positive compression ring 10. A negative compression ring 11 is sleeved on the top surface of the negative terminal 9, and a negative upper plastic encapsulation part 7 is sleeved on the negative compression ring 11. The positive upper plastic encapsulation part 6 and the negative upper plastic encapsulation part 7 are both injection-molded inserts formed by encapsulating and injection-molding the positive compression ring 10 and the negative compression ring 11. The negative terminal 9 includes a negative terminal 9-aluminum and a negative terminal 9-copper. A lower plastic 2 is fixed at the bottom of the top cover sheet 1. Fixing holes for cooperating with the positive terminal 8 and the negative terminal 9 are formed inside the top cover sheet 1 and the lower plastic 2. Sealing rings 3 are fixed in the two fixing holes in the lower plastic 2. After the sealing rings 3, the positive terminal 8 and the negative terminal 9, the lower plastic 2, the top cover sheet 1, the positive compression ring 10 and the negative compression ring 11, the positive upper plastic encapsulation part 6 and the negative upper plastic encapsulation part 7 are sequentially placed and assembled, a downward pressure in the Z direction is applied through a riveting die for flanging and riveting.
[0023] Specifically, by applying a downward pressure in the Z direction through the riveting die, after the positive upper plastic encapsulation part 6 and the positive compression ring 10 are pressed, and at the same time the sealing ring 3 reaches the specified compression position, the riveting die performs outward flanging and riveting on the positive terminal 8, thereby fixing the entire top cover assembly. Similarly, the installation methods of the negative upper plastic encapsulation part 7, the negative compression ring 11 and the negative terminal 9 are the same as those of the positive upper plastic encapsulation part 6, the positive compression ring 10 and the sealing ring 3.
[0024] As an optimization solution, as Figure 3 and Figure 5 shown, the positive pressure ring 10 is an injection molded insert formed after injection molding of the plastic coated part 6 on the positive electrode. After injection molding, the plastic coated part 6 on the positive electrode and the positive pressure ring 10 are the positive electrode injection molded assembly. The negative pressure ring 11 is an injection molded insert formed after injection molding of the plastic coated part 7 on the negative electrode. After injection molding, the negative pressure ring 11 and the plastic coated part 7 on the negative electrode are the negative electrode injection molded assembly. A number of through holes are equidistantly arranged inside the plastic coated part 6 on the positive electrode and the plastic coated part 7 on the negative electrode. The positive pressure ring 10 and the negative pressure ring 11 are both provided with perforated columns that cooperate with the plastic coated part 6 on the positive electrode and the plastic coated part 7 on the negative electrode.
[0025] Specifically, during injection molding, the injection liquid passes through the fixing holes and can form perforated columns in the fixing holes after cooling, ensuring firm connection and good sealing between the positive pressure ring 10 and the plastic coated part 6 on the positive electrode, and between the negative pressure ring 11 and the plastic coated part 7 on the negative electrode. At the same time, in cooperation with the sealing ring 3, it ensures the sealing between the positive electrode column 8 and the negative electrode column 9 and the top cover piece 1 and the lower plastic 2, thereby improving the sealing effect of the battery top cover plate.
[0026] For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this application, this application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of this application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the same elements of the claims are intended to be included in this application. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0027] As described above, the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit it; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A minimalist top cover plate structure for a square battery, characterized in that: It includes a top cover sheet (1), an explosion-proof valve (4) is provided at the center of the top cover sheet (1), and a protective sticker (5) is fixed on the top of the explosion-proof valve (4). A positive terminal (8) and a negative terminal (9) are arranged on the top surface of the top cover sheet (1). A positive pressure ring (10) is sleeved on the top surface of the positive terminal (8), and a positive upper plastic encapsulation part (6) is sleeved on the positive pressure ring (10). A negative pressure ring (11) is sleeved on the top surface of the negative terminal (9), and a negative upper plastic encapsulation part (7) is sleeved on the negative pressure ring (11). A lower plastic (2) is fixed to the bottom of the top cover sheet (1).
2. The minimalist top cover structure of the square battery according to claim 1, wherein: The positive upper plastic encapsulation part (6) and the negative upper plastic encapsulation part (7) are both injection-molded inserts formed by encapsulating and injection-molding the positive pressure ring (10) and the negative pressure ring (11). The negative terminal (9) includes a negative terminal (9)-aluminum and a negative terminal (9)-copper.
3. The minimalist top cover plate structure of the square battery according to claim 1, characterized in that: The positive pressure ring (10) is an injection-molded insert formed after the positive upper plastic encapsulation part (6) is encapsulated and injection-molded. After injection molding, the positive upper plastic encapsulation part (6) and the positive pressure ring (10) form a positive injection-molded component. The negative pressure ring (11) is an injection-molded insert formed after the negative upper plastic encapsulation part (7) is encapsulated and injection-molded. After injection molding, the negative pressure ring (11) and the negative upper plastic encapsulation part (7) form a negative injection-molded component.
4. The minimalist top cover plate structure of the square battery according to claim 1, characterized in that: Fixing holes for cooperating with the positive terminal (8) and the negative terminal (9) are formed inside both the top cover sheet (1) and the lower plastic (2). Sealing rings (3) are fixed in two fixing holes inside the lower plastic (2).
5. The minimalist top cover plate structure of the square battery according to claim 1, characterized in that: A number of through holes are equidistantly formed inside both the positive upper plastic encapsulation part (6) and the negative upper plastic encapsulation part (7). The positive pressure ring (10) and the negative pressure ring (11) are both provided with perforated columns for cooperating with the positive upper plastic encapsulation part (6) and the negative upper plastic encapsulation part (7).
6. The minimalist top cover plate structure of the square battery according to claim 4, wherein: After the sealing rings (3), the positive terminal (8) and the negative terminal (9), the lower plastic (2), the top cover sheet (1), the positive pressure ring (10) and the negative pressure ring (11), the positive upper plastic encapsulation part (6) and the negative upper plastic encapsulation part (7) are sequentially placed for assembly, a downward pressure in the Z direction is applied through a riveting die for flanging riveting.