Battery top cover structure

Abstract

The utility model relates to the technical field of batteries, in particular to a battery top cover structure, which comprises a top cover plate provided with two pole mounting holes. The battery further comprises a pole assembly installed in the pole installation hole, the pole assembly comprises a pole body, a welding ring and an upper plastic part, the pole body is sleeved with the welding ring, the upper plastic part is used for fixing the pole body and the welding ring, and the welding ring is connected with the pole installation hole in a welded mode; according to the utility model, the post assembly is simplified into a pre-assembled structure of the post body and the welding ring, so that processes such as punching and riveting can be omitted, and the manufacturing cost is reduced while the connection strength is ensured through welding and injection molding.

Description

Technical Field

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

[0002] The top cover assembly is an important component of the battery cell. Generally, battery cell top covers can be divided into three main categories based on their manufacturing process: injection molding, riveting, and spin riveting. Among these, injection molding offers the best cost and reliability and is the most widely used.

[0003] For example, the utility model patent with authorization announcement number CN218677339U discloses a stamped injection molded battery top cover structure, including a top cover sheet and an upper plastic part. The top cover sheet is provided with positive and negative terminal post assemblies. The positive terminal post assembly or the negative terminal post assembly includes a terminal post. The terminal post is fitted to the terminal post mounting position of the top cover sheet. The terminal post mounting position includes a terminal post hole and a stamping part. The upper end of the stamping part is bent inward or outward to form a second stamping part. The stamping part and the terminal post are not in contact. The upper plastic part is formed by injection molding on the stamping part and the terminal post. The upper plastic part fills the gap between the stamping part and the terminal post and is fixedly connected to the top cover sheet.

[0004] However, such a device still has its limitations. The aforementioned top cover structure achieves sealing by simultaneously using mechanical fixing of the riveting part and injection filling, which results in problems such as overly complex process and top cover structure design, leading to high manufacturing costs. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a battery top cover structure that simplifies the structure and manufacturing process of the top cover, thereby reducing manufacturing costs.

[0006] The technical solution to the problem of this utility model is to provide a battery top cover structure, including a top cover sheet, on which two terminal mounting holes are provided; and further including a terminal assembly installed in the terminal mounting holes, the terminal assembly including a terminal body, a welding ring sleeved on the outside of the terminal body, and an upper plastic part for fixing the terminal body and the welding ring, wherein the welding ring is welded to the terminal mounting holes.

[0007] Furthermore, the battery top cover structure provided by this utility model may also have the following feature: it further includes a lower plastic sheet, which is connected to the top cover sheet by injection molding.

[0008] Furthermore, the battery top cover structure provided by this utility model may also have the following feature: the top cover sheet is provided with a plurality of injection holes, and the plurality of injection holes are evenly spaced along the edge of the terminal mounting hole.

[0009] Furthermore, the battery top cover structure provided by this utility model may also have the following features: a first protrusion is provided on the top cover sheet; the first protrusion is provided on the edge of the terminal mounting hole and is welded to the welding ring.

[0010] Furthermore, the battery top cover structure provided by this utility model may also have the following features: the welding ring is provided with a plurality of anti-rotation grooves along its circumference, the electrode body is provided with a plurality of anti-rotation protrusions along its cylindrical surface, and the anti-rotation grooves are connected to the anti-rotation protrusions.

[0011] Furthermore, the battery top cover structure provided by this utility model may also have the following features: it further includes an explosion-proof valve assembly, the explosion-proof valve assembly including an explosion-proof valve mounting hole provided on the top cover plate, an explosion-proof valve body installed in the explosion-proof valve mounting hole, and an explosion-proof valve protective film covering the explosion-proof valve body.

[0012] Furthermore, the battery top cover structure provided by this utility model may also have the following features: a second protrusion is provided on the top cover plate; the second protrusion is provided on the edge of the explosion-proof valve mounting hole and is connected to the explosion-proof valve body.

[0013] Furthermore, the battery top cover structure provided by this utility model may also have the following features: a third protrusion is provided on the top cover plate; the third protrusion is provided on the edge of the hole of the explosion-proof valve mounting hole and is connected to the explosion-proof valve protective film.

[0014] Furthermore, the battery top cover structure provided by this utility model may also have the following features: the second protrusion is closer to the center of the explosion-proof valve mounting hole than the third protrusion, and the horizontal plane where its highest point is located is lower than the horizontal plane where the highest point of the third protrusion is located.

[0015] Furthermore, the battery top cover structure provided by this utility model may also have the following feature: the length of the portion of the electrode assembly exposed outside the electrode mounting hole does not exceed 2mm.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. In this application, by simplifying the pole assembly to a pre-assembled pole body and welding ring structure, processes such as stamping and riveting can be eliminated, and manufacturing costs can be reduced while ensuring connection strength through welding and injection molding.

[0018] 2. In this application, since the outer wall of the welding ring is connected to the inner wall of the first boss, that is, the pole assembly is located inside the first boss, and the injection hole is also located inside the first boss, the injection molding of the top cover and the lower plastic sheet and the injection molding of the pole assembly can be carried out simultaneously in a single injection molding, without the need for distributed manufacturing and assembly, which further simplifies the processing technology of the top cover.

[0019] 3. In this application, by limiting the length of the terminal assembly exposed outside the terminal mounting hole, it is possible to ensure that it meets the requirements for core-pack welding, thereby avoiding excessively long terminal assemblies from occupying too much space in the battery during battery manufacturing, which is beneficial to improving the cell capacity. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is an exploded view of the present invention;

[0023] Figure 3 This is an exploded view of the pole assembly of this utility model;

[0024] Figure 4 This is a cross-sectional view of the pole assembly of this utility model;

[0025] Figure 5 This is a schematic diagram of the top cover plate of this utility model.

[0026] In the picture:

[0027] 1. Top cover plate; 11. Pole post mounting hole; 12. Explosion-proof valve mounting hole; 13. First boss; 14. Second boss; 15. Third boss; 16. Fourth boss; 17. Injection hole; 2. Lower plastic sheet; 3. Pole post assembly; 31. Pole post body; 32. Welding ring; 33. Upper plastic part; 34. Anti-rotation groove; 35. Anti-rotation protrusion; 41. Explosion-proof valve body; 42. Explosion-proof valve protective film. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This utility model provides a battery top cover structure, the specific structure of which is as follows:

[0030] like Figure 1 and Figure 2 As shown, the battery top cover structure includes a top cover plate 1, on which two terminal mounting holes 11 are provided, namely a positive terminal mounting hole and a negative terminal mounting hole; the battery top cover structure also includes a terminal assembly 3 installed in the terminal mounting holes 11, the terminal assembly 3 including a positive terminal assembly 3 installed in the positive terminal mounting hole and a negative terminal assembly 3 installed in the negative terminal mounting hole.

[0031] like Figure 3 and Figure 4 As shown, the electrode assembly 3 includes an electrode body 31, a welding ring 32 sleeved on the outside of the electrode body 31, and an upper plastic part 33 for fixing the electrode body 31 and the welding ring 32. The welding ring 32 is welded to the electrode mounting hole 11. Specifically, the top cover 1 has an annular first boss 13, which is arranged around the edge of the electrode mounting hole 11, and the inner wall of the first boss 13 is welded to the outer wall of the welding ring 32. Compared with the traditional manufacturing process of injection molding and riveting, this utility model simplifies the structure of the electrode assembly 3 by pre-assembling the electrode body 31 and the welding ring 32, ensuring connection strength through welding and injection molding while reducing manufacturing costs.

[0032] like Figure 1 and Figure 2 As shown, the battery top cover structure also includes a lower plastic sheet 2, which is connected to the top cover sheet 1 via injection molding. Specifically, as... Figure 5 As shown, the top cover plate 1 has several injection holes 17, which are evenly spaced along the edge of the pole mounting holes 11 and are closer to the center of the pole mounting holes 11 than the first boss 13. During manufacturing, the injection molding of the top cover plate 1 and the lower plastic plate 2, and the injection molding of the pole assembly 3 can be performed simultaneously in a single injection molding process, eliminating the need for separate manufacturing and assembly, further simplifying the processing technology of the top cover. Furthermore, the welded connection between the welding ring 32 and the first boss 13 provides good sealing, avoiding the risk of leakage.

[0033] like Figure 3As shown, the welding ring 32 has several anti-rotation grooves 34 along its circumference, and the pole body 31 has several anti-rotation protrusions 35 along its cylindrical surface. The anti-rotation grooves 34 and the anti-rotation protrusions 35 are engaged to prevent the pole body 31 from rotating and to ensure the welding accuracy of the core package.

[0034] like Figure 1 and Figure 2 As shown, the battery top cover structure also includes an explosion-proof valve assembly. The explosion-proof valve assembly includes an explosion-proof valve mounting hole 12 located on the top cover plate 1 between the two pole mounting holes 11, an explosion-proof valve body 41 installed in the explosion-proof valve mounting hole 12, and an explosion-proof valve protective film 42 covering the explosion-proof valve body 41. Figure 5 As shown, the top cover plate 1 has a second boss 14, which is circumferentially disposed on the edge of the explosion-proof valve mounting hole 12 and welded to the explosion-proof valve body 41. The top cover plate 1 also has a third boss 15, which is circumferentially disposed on the edge of the explosion-proof valve mounting hole 12 and adhered to the explosion-proof valve protective film 42. The top cover plate 1 also has a fourth boss 16, which is circumferentially disposed on the edge of the explosion-proof valve mounting hole 12 and injection molded to the lower plastic sheet 2. Among them, the fourth boss 16 is closer to the center of the explosion-proof valve mounting hole 12 than the second boss 14, and the second boss 14 is closer to the center of the explosion-proof valve mounting hole 12 than the third boss 15. Furthermore, the horizontal plane of the highest point of the fourth boss 16 is lower than the horizontal plane of the highest point of the second boss 14, and the horizontal plane of the highest point of the second boss 14 is lower than the horizontal plane of the highest point of the third boss 15. This multi-level boss design can ensure accurate assembly and reliable sealing.

[0035] When the terminal assembly 3 is installed in the terminal mounting hole 11, the length of the portion of the terminal assembly 3 exposed in the terminal mounting hole 11 does not exceed 2mm, thereby ensuring that the length of the terminal assembly 3 is as small as possible to meet the requirements of core-pack welding. This avoids the terminal assembly 3 being too long and taking up too much space in the battery during battery manufacturing, which is beneficial to improving the cell capacity.

[0036] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0037] In the description of this invention, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0038] In the description of this invention, it should also be noted that the terms "center," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In the description of this invention, unless otherwise stated, "a number" means two or more.

[0039] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A battery top cover structure, characterized by, The device includes a top cover plate (1) with two pole mounting holes (11); it also includes a pole assembly (3) installed in the pole mounting holes (11), the pole assembly (3) including a pole body (31), a welding ring (32) sleeved on the outside of the pole body (31), and an upper plastic part (33) for fixing the pole body (31) and the welding ring (32), the welding ring (32) being welded to the pole mounting hole (11); and a lower plastic sheet (2), the lower plastic sheet (2) being connected to the pole mounting hole (11). The top cover plate (1) is connected by injection molding; the top cover plate (1) is provided with a plurality of injection holes (17), which are evenly distributed at intervals on the edge of the pole mounting hole (11); the top cover plate (1) is provided with an annular first boss (13), which is arranged around the edge of the pole mounting hole (11), and its inner wall is welded to the outer wall of the welding ring (32); the injection hole (17) is closer to the center of the pole mounting hole (11) than the first boss (13).

2. The battery cup structure of claim 1, wherein, The welding ring (32) has a plurality of anti-rotation grooves (34) along its circumference, and the pole body (31) has a plurality of anti-rotation protrusions (35) along its circumference. The anti-rotation grooves (34) are connected to the anti-rotation protrusions (35).

3. The battery cover structure of claim 1, wherein It also includes an explosion-proof valve assembly, which includes an explosion-proof valve mounting hole (12) provided on the top cover plate (1), an explosion-proof valve body (41) installed in the explosion-proof valve mounting hole (12), and an explosion-proof valve protective film (42) covering the explosion-proof valve body (41).

4. The battery cup structure of claim 3, wherein, The top cover plate (1) is provided with a second protrusion (14); the second protrusion (14) is located on the edge of the explosion-proof valve mounting hole (12) and is connected to the explosion-proof valve body (41).

5. The battery top cover structure according to claim 4, characterized in that, The top cover plate (1) is provided with a third protrusion (15); the third protrusion (15) is located on the edge of the explosion-proof valve mounting hole (12) and is connected to the explosion-proof valve protective film (42).

6. The battery cup structure of claim 5, wherein, The second boss (14) is closer to the center of the explosion-proof valve mounting hole (12) than the third boss (15), and the horizontal plane where its highest point is located is lower than the horizontal plane where the highest point of the third boss (15) is located.

7. The battery cover structure according to any one of claims 1 to 6, wherein The length of the portion of the pole assembly (3) exposed in the pole mounting hole (11) does not exceed 2 mm.

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