Square battery top cover plate structure

Abstract

The utility model relates to the technical field of top cover plate structures, and discloses a square battery top cover plate structure, which comprises an anode upper plastic cement, a top cover sheet and a cathode upper plastic cement, sealing assemblies are symmetrically arranged above the top cover sheet, a cathode column and an anode column are respectively clamped and assembled above the two sealing assemblies, and the anode column and the cathode column are respectively clamped and assembled above the top cover sheet. The fixing technology of the welding ring and the top cover piece is optimized to be penetration welding from butt seam welding, welding laser is prevented from influencing other parts through welding seams, the welding yield of the welding ring and the top cover piece is improved, and therefore the production efficiency of the cover plate is improved, and when the space structure is insufficient, the welding ring and the top cover piece can be fixed. The size and the cross sectional area of the pole are improved, the over-current capability of the cover plate, the charging rate of the battery cell and the safety are improved, and the problems that the welding reject ratio of the top cover plate of the existing square battery is high and the over-current capability of the top cover is low when the top cover can be designed in a limited space are solved, so that the applicability of the battery cell is improved.

Description

Technical Field

[0001] The present utility model application relates to the technical field of top cover plate structures, and specifically to a square battery top cover plate structure. 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 retention rate has become higher and higher. However, the defective rate of an important component, the top cover plate, in the battery cell needs to be further reduced to improve production efficiency and reduce production costs. At the same time, people pay more and more attention to the charging speed of electric vehicles and the safety of power batteries. A battery cell with a large over-current capacity can improve the charging speed of electric vehicles and also enhance the safety of the battery.

[0003] In the existing square battery top cover plate, the welding ring is butt-welded with the top cover sheet, and the welding laser will affect other components through the weld, resulting in a high welding defective rate. When the top cover is designed in a limited space, the over-current capacity is small. This battery cell is not suitable for use scenarios with fast charging rate and safety, and the adaptability of the top cover performance is poor. Summary of the Invention

[0004] In order to solve the problems of high welding defective rate of the existing square battery top cover plate and small over-current capacity when the top cover is designed in a limited space, the present utility model provides a square battery top cover plate structure to solve the above problems.

[0005] To achieve the above object, the present utility model provides the following technical solutions:

[0006] A square battery top cover plate structure includes a positive upper plastic, a top cover sheet, and a negative upper plastic. Sealing components are symmetrically arranged above the top cover sheet. A negative electrode column and a positive electrode column are respectively assembled by clamping above the two sealing components. A negative internal part is sleeved above the negative electrode column, and a positive internal part is sleeved above the positive electrode column. Welding rings are sleeved on the tops of the negative internal part and the positive internal part. The bottom of the welding ring is fixed on the top cover sheet by welding. A positive upper plastic is fixedly sleeved above the positive internal part, and a negative upper plastic is fixedly sleeved above the negative internal part. An explosion-proof valve is arranged at the center position of the top cover sheet, and a protection patch is fixed inside the top cover sheet above the explosion-proof valve. A lower insulating plate is fixed to the bottom of the top cover sheet.

[0007] Further, the positive upper plastic and the negative upper plastic are both fixed on the top cover sheet outside the negative internal part and the positive internal part by injection molding. The negative electrode column is made of aluminum and copper. The sealing components, the negative electrode column, the negative internal part, and the welding ring are sequentially sleeved and assembled from bottom to top. The sealing components, the positive electrode column, the positive internal part, and the welding ring are sequentially sleeved and assembled from bottom to top.

[0008] Further, both of the two welding rings are fixedly welded on the top cover sheet by means of laser penetration welding, and the width of the welding bead pattern of the welding is greater than the width of the welding ring.

[0009] Further, a plurality of grooves are equidistantly arranged on the top edges of the negative electrode post and the positive electrode post, and a plurality of bumps adapted to the grooves are fixedly arranged on the inner bottom surfaces of the negative electrode inner part and the positive electrode inner part.

[0010] Further, positioning blocks are symmetrically fixed on the top edges of the negative electrode inner part and the positive electrode inner part, and positioning grooves adapted to the positioning blocks are symmetrically arranged inside the two welding rings.

[0011] Further, central holes adapted to the negative electrode post and the positive electrode post are symmetrically arranged inside the top cover sheet and the lower insulating plate. The top cover sheet is provided with a hanging platform with an inverted buckle hole at the central holes of the negative electrode post and the positive electrode post. A buckle is fixed inside the central hole of the pole post of the lower insulating plate, and the top surface of the lower insulating plate is fixedly clamped on the hanging platform through the buckle.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, by optimizing the fixing process of the welding ring and the top cover sheet from butt welding to penetration welding, it is avoided that the welding laser affects other components through the weld seam, the welding yield rate of the welding ring and the top cover sheet is improved, thereby improving the production efficiency of the cover plate. And when the space structure is insufficient, the size of the pole post and the cross-sectional area of the pole post are increased, the over-current capacity, the charging rate and the safety of the cover plate are improved, and the problems of high welding defect rate of the existing square battery top cover plate and small over-current capacity when the top cover is designed in a limited space are solved, thereby improving the applicability of the battery cell. 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 to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0015] Figure 1 is a front view schematic diagram of the battery 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 battery top cover plate structure in the shown embodiment;

[0017] Figure 3 is Figure 1 a front view schematic diagram of the split structure of the battery top cover plate in the shown embodiment;

[0018] Figure 4 is Figure 1 The bottom view schematic diagram of the split structure of the battery top cover plate in the illustrated embodiment;

[0019] Figure 5 is Figure 1 The side view cross-sectional schematic diagram of the partial structure of the battery top cover plate in the illustrated embodiment;

[0020] Figure 6 is Figure 1 The front view cross-sectional schematic diagram of the partial structure of the battery top cover plate in the illustrated embodiment.

[0021] The meanings of the reference numerals in the figure: 1, upper plastic of the positive electrode; 2, welding ring; 3, inner part of the negative electrode; 4, negative electrode post; 5, sealing component; 6, top cover sheet; 7, explosion-proof valve; 8, protection patch; 9, lower insulating plate; 10, inner part of the positive electrode; 11, upper plastic of the negative electrode; 12, positive electrode post. Specific embodiments

[0022] In order 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 with reference to 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 creative efforts shall fall within the protection scope of the present application.

[0023] Refer to Figure 1 , Figure 2 and Figure 4, a square battery top cover plate structure, including a positive upper plastic 1, a top cover sheet 6, and a negative upper plastic 11. Sealing components 5 are symmetrically arranged above the top cover sheet 6. A negative terminal post 4 and a positive terminal post 12 are respectively snap-fitted and assembled above the two sealing components 5. A negative inner part 3 is sleeved above the negative terminal post 4, and a positive inner part 10 is sleeved above the positive terminal post 12. Welding rings 2 are sleeved on the tops of the negative inner part 3 and the positive inner part 10. The bottoms of the welding rings 2 are fixed to the top cover sheet 6 by welding. The two welding rings 2 are both fixed to the top cover sheet 6 by laser penetration welding, and the width of the welding bead pattern of the welding is greater than the width of the welding ring 2. A positive upper plastic 1 is fixedly sleeved above the positive inner part 10, and a negative upper plastic 11 is fixedly sleeved above the negative inner part 3. An explosion-proof valve 7 is arranged at the central position of the top cover sheet 6, and a protection patch 8 is fixed inside the top cover sheet 6 above the explosion-proof valve 7. A lower insulating plate 9 is fixed to the bottom of the top cover sheet 6. Central holes for cooperating with the negative terminal post 4 and the positive terminal post 12 are symmetrically opened inside the top cover sheet 6 and the lower insulating plate 9. The top cover sheet 6 is provided with a hanging platform with an inverted buckle hole at the central holes of the negative terminal post 4 and the positive terminal post 12. A buckle is fixed inside the pole column central hole of the lower insulating plate 9, and the top surface of the lower insulating plate 9 is snap-fitted and fixed to the hanging platform by the buckle.

[0024] Specifically, the sealing components 5 ensure the sealing between the negative terminal post 4 and the negative inner part 3 and the top cover sheet 6, and between the positive terminal post 12 and the positive inner part 10 and the top cover sheet 6. In the laser penetration welding method between the welding ring 2 and the top cover sheet 6, during the formation of the molten pool during welding, there is no gap between the top cover sheet 6 and the welding ring 2, and the laser cannot penetrate through the gap to irradiate the surfaces of the positive inner part 10, the positive terminal post 12, and the sealing components 5, so that no charring phenomenon will occur, and welding defects such as welding holes are not likely to occur. Furthermore, the welding yield rate and production efficiency of the top cover plate are significantly improved, making the battery top cover have high production efficiency, large overcurrent capacity, fast charging speed, good safety, and strong structural electrical performance adaptability.

[0025] As an optimized solution, as Figure 3 , Figure 5 and Figure 6 shown, the positive upper plastic 1 and the negative upper plastic 11 are both fixed to the top cover sheet 6 outside the negative inner part 3 and the positive inner part 10 by injection molding. The negative terminal post 4 is made of aluminum and copper. The sealing components 5, the negative terminal post 4, the negative inner part 3, and the welding ring 2 are sleeved and assembled in sequence from bottom to top. The sealing components 5, the positive terminal post 12, the positive inner part 10, and the welding ring 2 are sleeved and assembled in sequence from bottom to top. A number of grooves are equidistantly opened on the top surfaces of the edges of the negative terminal post 4 and the positive terminal post 12. A number of convex blocks for cooperating with the grooves are fixed to the inner bottom surfaces of the negative inner part 3 and the positive inner part 10. Positioning blocks are symmetrically fixed to the top edges of the negative inner part 3 and the positive inner part 10. Positioning grooves for cooperating with the positioning blocks are symmetrically opened inside the two welding rings 2.

[0026] Specifically, when assembling the negative electrode post 4 and the internal negative electrode parts 3, and the positive electrode post 12 and the internal positive electrode parts 10, align the bumps inside the internal negative electrode parts 3 and the internal positive electrode parts 10 and insert them into the grooves inside the negative electrode post 4 and the positive electrode post 12, and sleeve the internal negative electrode parts 3 and the internal positive electrode parts 10 outside the negative electrode post 4 and the positive electrode post 12. It is necessary to weld the welding ring 2 to the top cover piece 6, sleeve the positioning groove inside the welding ring 2 on the positioning blocks at the tops of the internal negative electrode parts 3 and the internal positive electrode parts 10, and make the welding ring 2 wrap around the outside of the internal negative electrode parts 3 and the internal positive electrode parts 10, and then weld and fix the bottom of the welding ring 2 to the top cover piece 6.

[0027] 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 claims involved.

[0028] As mentioned above, the above embodiments are only used to illustrate the technical solutions of this application and are not intended 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 described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A square battery top cover plate structure, characterized in that: It includes the upper plastic of the positive electrode (1), the top cover sheet (6) and the upper plastic of the negative electrode (11). Sealing components (5) are symmetrically arranged above the top cover sheet (6). A negative electrode post (4) and a positive electrode post (12) are respectively snap-fitted and assembled above the two sealing components (5). A negative electrode inner part (3) is sleeved above the negative electrode post (4), and a positive electrode inner part (10) is sleeved above the positive electrode post (12). Welding rings (2) are sleeved on the tops of the negative electrode inner part (3) and the positive electrode inner part (10). The bottom of the welding ring (2) is fixed to the top cover sheet (6) by welding. The upper plastic of the positive electrode (1) is fixedly sleeved above the positive electrode inner part (10), and the upper plastic of the negative electrode (11) is fixedly sleeved above the negative electrode inner part (3). An explosion-proof valve (7) is arranged at the center of the top cover sheet (6), and a protection patch (8) is fixed inside the top cover sheet (6) above the explosion-proof valve (7). A lower insulating plate (9) is fixed to the bottom of the top cover sheet (6).

2. The square battery top cover plate structure according to claim 1, characterized in that: The upper plastic of the positive electrode (1) and the upper plastic of the negative electrode (11) are both fixed by injection molding on the top cover sheet (6) outside the negative electrode inner part (3) and the positive electrode inner part (10). The negative electrode post (4) is made of aluminum and copper. The sealing components (5), the negative electrode post (4), the negative electrode inner part (3) and the welding ring (2) are sleeved and assembled in sequence from bottom to top. The sealing components (5), the positive electrode post (12), the positive electrode inner part (10) and the welding ring (2) are sleeved and assembled in sequence from bottom to top.

3. The square battery top cover plate structure according to claim 1, characterized in that: Both of the two welding rings (2) are fixed to the top cover sheet (6) by laser penetration welding, and the width of the welding bead pattern of the welding is greater than the width of the welding ring (2).

4. The square battery top cover plate structure according to claim 1, characterized in that: A number of grooves are equidistantly opened on the top edges of the negative electrode post (4) and the positive electrode post (12). A number of bumps that cooperate with the grooves are fixed to the inner bottom surfaces of the negative electrode inner part (3) and the positive electrode inner part (10).

5. The square battery top cover plate structure according to claim 1, characterized in that: Positioning blocks are symmetrically fixed on the top edges of the negative electrode inner part (3) and the positive electrode inner part (10). Positioning grooves that cooperate with the positioning blocks are symmetrically opened inside the two welding rings (2).

6. The square battery top cover plate structure according to claim 1, wherein: Central holes that cooperate with the negative electrode post (4) and the positive electrode post (12) are symmetrically opened inside the top cover sheet (6) and the lower insulating plate (9). The top cover sheet (6) is provided with a hanging platform with an inverted buckle hole at the central holes of the negative electrode post (4) and the positive electrode post (12). A buckle is fixed inside the central hole of the pole of the lower insulating plate (9), and the top surface of the lower insulating plate (9) is snap-fitted and fixed to the hanging platform by the buckle.

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