A battery top cover

Abstract

The utility model relates to battery technical field, more particularly, relate to a kind of battery top cover, it includes top cover piece, lower plastic, pole, upper plastic, briquetting and sealing ring, wherein the briquetting is close to the one end of sealing ring and provided with protrusion, the top surface of protrusion abuts pole, and the inner wall of protrusion is close to pole surface and is provided. By setting protrusion, so that when the top surface of the protrusion of briquetting abuts pole battery top cover is fixed in suitable position and keeps stable when the position of welding between briquetting and pole remains fixed, improve the accuracy of welding, since setting protrusion and protrusion inner wall close to pole surface setting can increase the penetration when welding, improve welding strength.

Description

Technical Field

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

[0002] As one of the most important structural components of a battery cell, the top cover plays a crucial role in sealing and controlling input and output current. The structure of the top cover directly affects the performance and cost of the entire battery cell. Currently, top covers in the industry can be categorized by their terminal post structure into injection-molded and riveted structures. Different structures result in different performance characteristics and costs for the top cover.

[0003] The current low-cost method for connecting the terminals to the battery top cover is welding. However, the heat generated during welding can easily cause the gas sealing components of the top cover, such as the sealing ring, to fail. Furthermore, shallow welds can lead to insufficient weld strength.

[0004] Therefore, there is an urgent need to invent a battery top cover. Utility Model Content

[0005] The purpose of this utility model is to provide a battery top cover that is easy to assemble, simple to weld, has a high success rate, and high welding strength, in order to address the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] This application provides a battery top cover, including a top cover sheet, a lower plastic, a terminal post, an upper plastic, a pressing block, and a sealing ring. The top cover sheet and the lower plastic are tightly attached to each other, and the top cover sheet and the lower plastic are provided with a first mounting hole and a second mounting hole arranged coaxially. The terminal post passes through the first mounting hole and the second mounting hole from top to bottom. The upper plastic is snapped between the terminal post and the top cover sheet. The sealing ring and the pressing block are sequentially sleeved on the end of the terminal post away from the top cover sheet.

[0008] The pressure block has a protrusion around one end of the pole post, the protrusion is in close contact with the pole post, the sealing ring is in close contact with the protrusion, the top cover plate and the pole post, and the protrusion is used to position the sealing ring.

[0009] Furthermore, the pole post has a first step structure, a second step structure, and a third step structure along the axial direction by controlling different radii. The protrusion is set close to the third step structure, the pressure block surrounds the third step structure, and the protrusion abuts against the second step structure.

[0010] Furthermore, a second groove is provided on the side of the pressure block away from the protrusion, and a third groove is provided on the side of the third step structure close to the second groove, with the bottoms of the second groove and the third groove flush.

[0011] Furthermore, the radii of the first step structure, the second step structure, and the third step structure gradually decrease along the axial direction.

[0012] Furthermore, the lower plastic is provided with a first groove, and the outer periphery of the pressing block is engaged with the first groove.

[0013] Furthermore, the lower plastic sheet has a boss on the other side of the first groove that has the same shape as the first groove, and the top cover sheet has a recess of the same shape and size corresponding to the boss.

[0014] Furthermore, one end of the sealing ring in the thickness direction presses against the pressure block, while the other end simultaneously presses against the second stepped structure and the top cover plate.

[0015] Furthermore, the thickness of the protrusion is 0.55mm to 0.75mm.

[0016] Furthermore, the sealing ring has a chamfer on the side closest to the pole post.

[0017] Furthermore, the first groove is rectangular in shape, and the pressure block is formed to match the shape of the first groove.

[0018] The beneficial effects of this utility model are as follows: The top cover, lower plastic, terminal post, upper plastic, pressure block, and sealing ring of this application are arranged in a cooperative manner. After installation, the pressure block is pressed to fix the battery top cover as a whole. Then, the pressure block and terminal post are welded to complete the installation of the battery top cover. This application provides a protrusion at one end of the pressure block surrounding the terminal post, which helps to position the sealing ring. When the sealing ring is compressed, it will deform. The protrusion reduces the possibility of the sealing ring contacting the terminal post due to compression deformation, resulting in excessive resistance during compression. This allows the pressure block to smoothly compress the sealing ring to the designated position, improving the accuracy of welding. Because the protrusion is provided and the inner wall of the protrusion is close to the surface of the terminal post, it can increase the penetration depth during welding and improve the welding strength. At the same time, it also strengthens the strength of the pressure block and reduces the deformation of the pressure block caused by the high temperature of welding. When welding, the molten metal flows with the weld. The protrusion increases the length of the weld, making it more difficult for the molten metal to flow across the weld, thus reducing the impact of the molten metal on other parts. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 This is one of the exploded views of this utility model;

[0021] Figure 2 This is the second exploded view of this utility model;

[0022] Figure 3 This is a top view of the present invention;

[0023] Figure 4 This is a cross-sectional view of the present invention;

[0024] Figure 5 This is an enlarged view of section A of this utility model;

[0025] Figure 6 This is a structural diagram of the pole post of this utility model;

[0026] Figure 7 This is a structural diagram of the pressing block of this utility model.

[0027] Wherein: 1-Top cover plate; 11-First mounting hole; 12-Recess; 2-Lower plastic; 21-Second mounting hole; 22-First groove; 23-Boss; 3-Pole post; 31-First step structure; 32-Second step structure; 33-Third step structure; 331-Third groove; 4-Upper plastic; 5-Pressure block; 51-Protrusion; 52-Second groove; 6-Sealing ring. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0031] like Figure 1-7 The diagram shows a battery top cover, including a top cover sheet 1, a lower plastic 2, a terminal post 3, an upper plastic 4, a pressure block 5, and a sealing ring 6. The top cover sheet 1 and the lower plastic 2 are tightly fitted together, and the top cover sheet 1 and the lower plastic 2 are provided with a first mounting hole 11 and a second mounting hole 21 arranged coaxially. The terminal post 3 passes through the first mounting hole 11 and the second mounting hole 21 from top to bottom. The upper plastic 4 is held between the terminal post 3 and the top cover sheet 1. The sealing ring 6 and the pressure block 5 are sequentially fitted onto the end of the terminal post 3 away from the top cover sheet 1. The pressure block 5 is provided with a protrusion 51 around one end of the terminal post 3. The protrusion 51 is tightly fitted with the terminal post 3. The sealing ring is tightly fitted with the protrusion 51, the top cover sheet 1, and the terminal post 3. The protrusion 51 is used to position the sealing ring 6.

[0032] The protrusion 51 increases the depth of the weld, allowing for a greater penetration depth during welding, resulting in better welding performance. Furthermore, the protrusion 51 positions the sealing ring 6 and prevents it from entering the gap between the pressure block 5 and the pole post 3 after compression deformation. This prevents the sealing ring 6 from entering the weld and causing excessive resistance between the pressure block 5 and the pole post 3, thus ensuring that the pressure block 5 can be pressed into the appropriate position for welding, resulting in more precise welding.

[0033] The battery top cover of this application is installed as follows: the top cover plate 1 and the lower plastic 2 are tightly attached to the first mounting hole 11 and the second mounting hole 21 respectively; then the upper plastic 4 is installed from one side of the top cover plate 1 so that the upper plastic 4 is snapped into the edge of the first mounting hole 11; then the terminal post 3 is sequentially inserted from one side of the top cover plate 1 into the first mounting hole 11 and the second mounting hole 21, and the upper plastic 4 is snapped into the first mounting hole 11 to achieve insulation between the terminal post 3 and the top cover plate and fixation of the upper end of the battery top cover; the sealing ring 6 and the pressure block 5 are sequentially sleeved on the terminal post. The column 3 and the pressure block 5 are snapped into the lower plastic 2. Pressing down the pressure block 5 fixes the entire battery top cover and seals the sealing ring 6. The entire battery top cover is then fixed by welding the wall of the pressure block 5 and the wall of the terminal post 3. The welding between the pressure block 5 and the terminal post 3 is enhanced by the protrusion 51, which allows the weld penetration to extend to the protrusion 51, resulting in better weld quality. The top surface of the protrusion 51 abuts against the terminal post 3, which also prevents the flow of welding liquid and avoids affecting other parts.

[0034] Preferably, the terminal post 3 has a first step structure 31, a second step structure 32, and a third step structure 33 along the axial direction by controlling different radii. The pressure block 5 surrounds the third step structure 33, and the protrusion 51 abuts against the second step structure 32. The step structure allows different parts to be reasonably distributed and installed on different step structures when fitted onto the terminal post 3, ensuring reasonable installation. When the protrusion 51 of the pressure block 5 abuts against the second step structure 32, the battery top cover is fixed in a suitable position and remains stable. Since the size of the protrusion 51 is fixed, when the pressure block is pressed, the relative position between the pressure block 51 and the terminal post 3 remains fixed, so that the position between the pressure block 5 and the terminal post 3 is fixed during welding, improving the accuracy of welding.

[0035] In some embodiments, the third step is the welding position of the pole post 3 and the pressure block 5. By setting the thickness to be consistent, the welding space can be utilized to the maximum extent, and the consistent thickness during welding can better align the welding plane and make welding more convenient.

[0036] Preferably, the radii of the first step structure 31, the second step structure 32 and the third step structure 33 gradually decrease along the axial direction, which is beneficial for the sequential installation of parts of different sizes on the pole post 3.

[0037] like Figure 5-7 As shown, a second groove 52 is provided on the side of the pressure block 5 away from the protrusion 51, and a third groove 331 is provided on the side of the third step structure 33 close to the second groove 52. The bottoms of the second groove 52 and the third groove 331 are flush. The second groove 52 and the third groove 331 can form a welding groove. During welding, the molten metal flows along the groove and flows down along the gap between the pole post 3 and the pressure block 5, which is beneficial to improving the welding quality and making welding more convenient and precise.

[0038] Preferably, the radii of the first step structure 31, the second step structure 32, and the third step structure 33 gradually decrease along the axial direction. This arrangement facilitates the sequential installation of different parts onto the step structure, making the installation of the battery top cover more convenient.

[0039] Preferably, the lower plastic 2 is provided with a first groove 22, and the outer periphery of the pressing block 5 is engaged with the first groove 22. The first groove 22 is provided to facilitate the precise placement of the pressing block 5 and prevents the pressing block 5 and the lower plastic 2 from shaking randomly.

[0040] Preferably, the lower plastic 2 is provided with a boss 23 on the other side of the first groove 22, which has the same shape as the first groove 22, and the top cover 1 is provided with a recess 12 of matching shape and size corresponding to the boss 23, so that the lower plastic 2 and the top cover 1 are tightly fitted together and the lower plastic 2 is partially embedded in the top cover 1 to ensure that the position between the two is relatively fixed.

[0041] Preferably, one end of the sealing ring 6 in the thickness direction presses against the pressure block 5, and the other end simultaneously presses against the second step structure 32 and the top cover plate 1. The compression thickness of the sealing ring 6 can be controlled by the thickness of the protrusion 51 and the thickness of the plastic 2 under the first groove 22. The appropriate thickness of the protrusion 51 and the thickness of the plastic 2 under the first groove 22 can be set according to the shape of the sealing ring 6 and the sealing requirements, thereby adjusting the degree of compression of the sealing ring 6 at different positions.

[0042] Preferably, the thickness of the protrusion 51 is 0.55mm to 0.75mm. Within this thickness range, the compression thickness of the sealing ring 6 is appropriate. By using the appropriate compression thickness, the sealing effect of the sealing ring 6 can be fully utilized, and the depth of the molten pool during welding can also be guaranteed.

[0043] In some embodiments, the sealing ring 6 has a chamfer on the side near the pole post 3, which is beneficial for the installation of the sealing ring 6. When the sealing ring 6 is sealed by compression, it deforms and the excess material is squeezed to the connection between the second step structure 32 and the protrusion 51 of the pole post, thereby improving the sealing effect at the connection between the second step structure 32 and the protrusion 51.

[0044] In some embodiments, the first groove 22 is rectangular in shape, and the pressure block 5 is formed to match the shape of the first groove 22. The right angle characteristic of the rectangle can form a clear "bidirectional limit". After the pressure block 5 is embedded in the groove, it will not rotate or shift in the horizontal direction (X-axis, Y-axis) and can accurately fix the position of the pressure block 5.

[0045] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be protected within the scope of the appended claims.

Claims

1. A battery top cover, characterized in that: The device includes a top cover (1), a lower plastic (2), an electrode post (3), an upper plastic (4), a pressure block (5), and a sealing ring (6). The top cover (1) and the lower plastic (2) are tightly fitted together, and the top cover (1) and the lower plastic (2) are provided with a first mounting hole (11) and a second mounting hole (21) arranged coaxially. The electrode post (3) passes through the first mounting hole (11) and the second mounting hole (21) from top to bottom. The upper plastic (4) is clamped between the electrode post (3) and the top cover (1). The sealing ring (6) and the pressure block (5) are sequentially sleeved on the end of the electrode post (3) away from the top cover (1). The pressure block (5) is provided with a protrusion (51) around one end of the pole post (3). The protrusion (51) is in close contact with the pole post (3). The sealing ring is in close contact with the protrusion (51), the top cover plate (1) and the pole post (3). The protrusion (51) is used to position the sealing ring (6).

2. The battery top cover according to claim 1, characterized in that: The pole post (3) has a first step structure (31), a second step structure (32) and a third step structure (33) along the axial direction by controlling different radii. The pressure block (5) surrounds the third step structure (33) and the protrusion (51) abuts against the second step structure (32).

3. The battery top cover according to claim 2, characterized in that: The pressure block (5) has a second groove (52) on the side away from the protrusion (51), and the third step structure (33) has a third groove (331) on the side close to the second groove (52), and the bottoms of the second groove (52) and the third groove (331) are flush.

4. The battery top cover according to claim 2, characterized in that: The radii of the first step structure (31), the second step structure (32), and the third step structure (33) gradually decrease along the axial direction.

5. The battery top cover according to claim 2, characterized in that: The lower plastic (2) is provided with a first groove (22), and the outer periphery of the pressure block (5) is engaged with the first groove (22).

6. The battery top cover according to claim 5, characterized in that: The lower plastic (2) has a boss (23) with the same shape as the first groove (22) on the other side of the first groove (22), and the top cover (1) has a recess (12) with a matching shape and size corresponding to the boss (23).

7. The battery top cover according to claim 6, characterized in that: One end of the sealing ring (6) in the thickness direction presses against the pressure block (5), and the other end simultaneously presses against the second step structure (32) and the top cover plate (1).

8. The battery top cover according to claim 7, characterized in that: The thickness of the protrusion (51) is 0.55mm to 0.75mm.

9. The battery top cover according to claim 7, characterized in that: The sealing ring (6) has a chamfer on the side near the pole post (3).

10. The battery top cover according to claim 5, characterized in that: The first groove (22) is rectangular in shape, and the pressure block (5) is formed to match the shape of the first groove (22).

Images