CN221041315U - Battery cover plate and square aluminum shell lithium ion battery - Google Patents

Abstract

The utility model relates to a battery cover plate and a square aluminum shell lithium ion battery, wherein the battery cover plate comprises a top cover, a riveting block, a reinforcing piece and a pole component, the reinforcing piece is arranged between the top cover and the riveting block, the reinforcing piece and the top cover are respectively provided with a first through hole, a second through hole and a third through hole, the first through hole, the second through hole and the third through hole are coaxial, the pole component comprises a pole, and the pole sequentially penetrates through the third through hole, the second through hole and the first through hole to be connected with the riveting block. The influence of welding stress is reduced by improving the strength of the riveting block, so that the damage probability of the pole is reduced, the overall performance of the battery is improved, and the production cost is reduced.

Description

Battery cover plate and square aluminum shell lithium ion battery

Technical Field

The utility model relates to the technical field of manufacturing of new energy batteries, in particular to a battery cover plate and a square aluminum-shell lithium ion battery.

Background

Along with the development of clean energy electric automobiles, power lithium batteries are rapidly developed, and the structure of the power lithium batteries is also continuously optimized, wherein a battery cover plate is one important link in the battery structure. In the prior art, the riveting block is often assembled on the top cover of the battery in a welding mode, so that the riveting block and the top cover are integrated. Some enterprises generally manufacture the riveting block to be slender and thin for reducing the cost, but a large amount of heat is generated during welding, so that stress concentration of a welding surface is caused, the riveting block is cracked or slightly deformed, and further, poor polar posts are caused, and the performance of the battery is influenced.

Disclosure of utility model

The utility model aims to provide a battery cover plate, which reduces the influence of welding stress by improving the strength of a riveting block, thereby reducing the damage probability of a pole and improving the overall performance of a battery.

The utility model provides a battery cover plate, includes top cap, riveting piece, reinforcement and utmost point post subassembly, the reinforcement is located the top cap with between the riveting piece, reinforcement and top cap are equipped with first through-hole, second through-hole and third through-hole respectively, first through-hole, second through-hole and third through-hole are coaxial, utmost point post subassembly includes the utmost point post, the utmost point post passes in proper order third through-hole, second through-hole, first through-hole with the riveting piece is connected.

In the above technical scheme, the reinforcement is located between top cap and the riveting piece, can support the riveting piece, improves the intensity of riveting piece, when welding top cap and riveting piece, the reinforcement can disperse the heat that the welding produced, releases welding stress to reduce the riveting piece and take place the possibility of thermal deformation, promote the yields of welding processing, and then promote the performance of battery.

Further, a boss is arranged on the surface of one side, facing the reinforcing piece, of the riveting block, a surrounding wall is arranged on the periphery of the reinforcing piece, and the surrounding wall is sleeved on the boss.

In the technical scheme, the reinforcing piece can be sleeved on the periphery of the boss through the surrounding wall, the inner surface of the surrounding wall is propped against the outer surface of the boss, so that the reinforcing piece is tightly connected with the riveting block, and the strength of the riveting block is improved.

Further, the boss is provided with a reinforcing rib, and the reinforcing rib extends along the length direction of the boss.

In the technical scheme, on one hand, the reinforcing rib can enhance the strength of the riveting block without increasing the wall thickness of the riveting block, thereby reducing the weight and the cost; on the other hand, the deformation of the riveting block caused by uneven stress caused by welding of the wall thickness difference can be overcome.

Further, the top cover is provided with a positioning column, the reinforcing piece is provided with a mounting hole, and the positioning column penetrates through the mounting hole to position the reinforcing piece.

In the technical scheme, the positioning columns penetrate through the mounting holes so that the reinforcing piece and the top cover can be tightly connected together.

Furthermore, the riveting block is provided with a positioning groove corresponding to the positioning column, and the end part of the positioning column stretches into the positioning groove.

In the technical scheme, the positioning column, the mounting hole and the positioning groove are coaxial, the positioning column penetrates through the mounting hole and stretches into the positioning groove, stability and accuracy of the relative positions of the top cover, the reinforcing piece and the riveting block are ensured, the welding effect is improved, and further the battery performance is improved.

Further, the pole assembly further comprises a pole plate, the pole plate is provided with a slotted hole, the top cover is provided with a protruding block, and the protruding block penetrates through the slotted hole to be connected with the pole.

In the technical scheme, the lug penetrates through the oblong hole to be connected with the pole plate, so that the connection tightness of the pole plate and the top cover is ensured, the pole is ensured to be connected with the riveting block, and the performance of the pole is improved.

Further, the riveting block is provided with at least one stress relief groove, and the stress relief groove is arranged around the periphery of the first through hole and is coaxial with the first through hole.

In the technical scheme, the stress release groove is formed in the riveting block, and when the riveting block is welded with the pole, the welding stress can be released through the stress release groove, so that welding seam cracking caused by the welding stress is avoided, the welding seam yield and reliability are ensured, and the manufacturing cost of the battery is reduced.

The application also provides a square aluminum shell lithium ion battery, which comprises the battery cover plate. Through setting up above-mentioned battery cover plate to square aluminum hull lithium ion battery's wholeness ability has been improved.

Compared with the prior art, the utility model has the beneficial effects that: the reinforcement is located between top cap and the riveting piece, can support the riveting piece, improves the intensity of riveting piece, when welding top cap and riveting piece, the reinforcement can disperse the heat that the welding produced, release welding stress to reduce the riveting piece and take place the possibility of thermal deformation, promote welding process's yields, and then promote the performance of battery.

Drawings

Fig. 1 is a schematic structural diagram of a battery cover plate according to an embodiment of the utility model.

Fig. 2 is an exploded view of a battery cover according to an embodiment of the present utility model.

Fig. 3 is a schematic view of a rivet block of a battery cover plate according to an embodiment of the present utility model.

Fig. 4 is a partial schematic view of a battery cover plate according to an embodiment of the utility model.

Description of the reference numerals

Top cap 1, third through hole 101, reference column 102, bump 103, rivet block 2, first through hole 201, boss 202, stiffener 2021, positioning groove 203, first stress relief groove 204, second stress relief groove 205, stiffener 3, second through hole 301, enclosure wall 302, mounting hole 303, pole component 4, pole 401, pole plate 402, oblong hole 4021.

Detailed Description

The battery cover plate and the square aluminum-shell lithium ion battery of the utility model are further described in detail below with reference to specific embodiments and drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, in a preferred embodiment of the battery cover plate of the present utility model, the battery cover plate comprises a top cover 1, a riveting block 2, a reinforcement 3 and a post assembly 4, wherein the reinforcement 3 is disposed between the top cover 1 and the riveting block 2, the reinforcement 3 and the top cover 1 are respectively provided with a first through hole 201, a second through hole 301 and a third through hole 101, the first through hole 201, the second through hole 301 and the third through hole 101 are coaxial, and meanwhile, the post assembly 4 comprises a post 401, and the post 401 sequentially passes through the third through hole 101, the second through hole 301 and the first through hole 201 to be connected with the riveting block 2.

According to the technical scheme, the reinforcing piece 3 is arranged between the top cover 1 and the riveting block 2, the riveting block 2 can be supported, the strength of the riveting block 2 is improved, the reinforcing piece 3 can disperse heat generated by welding when the top cover 1 and the riveting block 2 are welded, and the welding stress is released, so that the possibility that the riveting block 2 is deformed by heating is reduced, the yield of welding processing is improved, and the performance of a battery is further improved.

Specifically, the riveting piece 2 has boss 202 towards one side surface of reinforcement 3, and the periphery of reinforcement 3 has enclosure wall 302, and boss 202 is located to enclosure wall 302 cover, and the periphery of boss 202 is located to reinforcement 3 accessible enclosure wall 302 cover, and the internal surface of enclosure wall 302 offsets with the surface of boss 202 to guarantee that reinforcement 3 is inseparabler with the connection of riveting piece 2, further improve the intensity of riveting piece 2.

Further, the boss 202 is provided with a reinforcing rib 2021, and the reinforcing rib 2021 extends in the length direction of the boss 202. The reinforcing rib 2021 can enhance the strength of the riveting block 2 without increasing the wall thickness of the riveting block 2, reduce the weight and the cost, and can overcome the deformation of the riveting block 2 caused by uneven stress caused by the wall thickness difference during welding to influence the welding effect.

Referring to fig. 3, the stiffener 3 is matched to the size of the rivet block 2. The size of the reinforcing piece 3 is matched with that of the riveting block 2, so that the reinforcing piece 3 and the riveting block 2 are consistent in size, the problem that the strength of the riveting block 2 cannot be improved due to uneven thickness is avoided, and the welding effect of the riveting block 2 and the top cover 1 is affected.

Referring to fig. 2 and 4, the top cover 1, the reinforcement 3, and the rivet block 2 are respectively provided with a positioning post 102, a mounting hole 303, and a positioning groove 203, and the positioning post 102 extends into the positioning groove 203 through the mounting hole 30. The positioning column 102, the mounting hole 303 and the positioning groove 203 are coaxial, the positioning column 102 passes through the mounting hole 303 and is abutted with the positioning groove 203, the stability and accuracy of the relative positions of the top cover 1, the reinforcing piece 3 and the riveting block 2 are ensured, the welding effect is improved, and the battery performance is further improved.

Referring to fig. 4 again, the pole assembly 4 further includes a pole plate 402, the pole plate 402 is provided with a slotted hole 4021, the top cover 1 is provided with a bump 103, and the bump 103 passes through the slotted hole 4021 to be connected with the pole plate 402, so as to ensure connection tightness between the pole plate 402 and the top cover 1, thereby ensuring connection between the pole 401 and the riveting block 2, and improving performance of the pole 401. In this embodiment, the pole 401 is any one of a copper-aluminum composite pole or an aluminum pole, wherein the pole component 4 is divided into a positive pole component and a negative pole component, the pole of the positive pole component is generally an aluminum pole, and the pole of the negative pole component is generally a copper-aluminum composite pole, so as to adapt to the conductivity of the battery cell of the power battery.

In addition, in some embodiments, the outer peripheral outline of the bump 103 may also have other shapes such as a square, an oval, etc., and when the outer peripheral outline of the bump 103 has a square shape, the oblong hole 4021 has a corresponding square shape.

Referring to fig. 3 again, the rivet block 2 is provided with a stress relief groove, which is disposed around the periphery of the first through hole 201 and is coaxial with the first through hole 201. According to the embodiment, the first stress release groove 204 and the second stress release groove 205 are formed, and the first stress release groove 204 and the second stress release groove 205 are formed in the riveting block 2, so that when the riveting block 2 is welded with the pole 401, welding stress can be released through the first stress release groove 204 and the second stress release groove 205, welding stress is prevented from causing welding seam cracking, welding seam yield and reliability are guaranteed, and manufacturing cost of a battery is reduced.

The application also provides a square aluminum shell lithium ion battery, which comprises the battery cover plate. Through setting up above-mentioned battery cover plate to square aluminum hull lithium ion battery's wholeness ability has been improved. The top cover 1 and the rivet block 2 are preferably made of aluminum alloy having high corrosion resistance and strength.

In the description of the present utility model, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

While the utility model has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.

Claims (8)

1. The utility model provides a battery apron, its characterized in that includes top cap, riveting piece, reinforcement and utmost point post subassembly, the reinforcement is located the top cap with between the riveting piece, reinforcement and top cap are equipped with first through-hole, second through-hole and third through-hole respectively, first through-hole, second through-hole and third through-hole are coaxial, utmost point post subassembly includes the utmost point post, the utmost point post passes in proper order third through-hole, second through-hole, first through-hole with the riveting piece is connected.

2. The battery cover plate according to claim 1, wherein a side surface of the rivet block facing the reinforcement has a boss, a periphery of the reinforcement has a surrounding wall, and the surrounding wall is sleeved on the boss.

3. The battery cover plate according to claim 2, wherein the boss is provided with a reinforcing rib extending in a length direction of the boss.

4. The battery cover plate of claim 1, wherein the top cover is provided with a locating post, the stiffener is provided with a mounting hole, and the locating post passes through the mounting hole to locate the stiffener.

5. The battery cover plate according to claim 4, wherein the rivet block is provided with a positioning groove corresponding to the positioning column, and an end portion of the positioning column extends into the positioning groove.

6. The battery cover plate of claim 1, wherein the post assembly further comprises a post plate, the post plate is provided with an oblong hole, the top cover is provided with a bump, and the bump passes through the oblong hole to be connected with the post plate.

7. The battery cover plate of claim 1, wherein the rivet block is provided with at least one stress relief groove that surrounds and is coaxial with the first through hole.

8. A square aluminum-case lithium ion battery comprising the battery cover plate according to any one of claims 1 to 7.