CN215731940U

CN215731940U - Battery top cap subassembly

Info

Publication number: CN215731940U
Application number: CN202121029163.4U
Authority: CN
Inventors: 李开波; 何巍; 刘金成
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2022-02-01
Anticipated expiration: 2031-05-13

Abstract

The utility model provides a battery top cover assembly which is few in parts, simple in production process of each part, high in forming efficiency and capable of ensuring high precision. The pole and the sealing element are integrally arranged above the lower surface of the top cover plate, so that the occupied accommodating space of the battery pole piece can be reduced, and the effective capacity of the battery pole piece is improved. There is provided a battery top cap assembly comprising: a pole column; the terminal post fixing device comprises a top cover plate, a terminal post leading-out hole is formed in the top cover plate, a first fixing part is arranged above the periphery of the terminal post leading-out hole, a second fixing part is arranged at the lower end of the inner side wall of the terminal post leading-out hole, the first fixing part at least covers one part of the upper surface of a terminal post, and the second fixing part at least covers one part of the lower surface of the terminal post; the sealing element is arranged between the top cover plate and the pole, a convex ring/groove is arranged on the outer surface of the sealing element, and a groove/convex ring corresponding to the convex ring/groove is arranged on the pole and/or the top cover plate.

Description

Battery top cap subassembly

Technical Field

The utility model relates to the technical field of energy storage devices, in particular to a top cover assembly of a secondary battery.

Background

The power battery is a core component of a new energy automobile, and along with the rapid development of the new energy automobile industry in China, the requirement on the power battery is higher and higher, so that how to further improve the energy density of the power battery and reduce the cost of the power battery is a problem of key attention of a power battery manufacturer.

A prior art battery top cap assembly, as described in CN108428823A, comprises: lamina tecti, electrode terminal, mounting, sealing member and connecting piece, wherein: the top cover plate is provided with an electrode leading-out hole; the fixing piece is fixed on the top cover plate through the connecting piece; the electrode terminal comprises a terminal plate, the peripheral surface of the terminal plate is at least partially surrounded by the fixing piece so as to fix the electrode terminal on the fixing piece, the terminal plate is positioned on one side of the top cover plate and covers the electrode leading-out hole, and the peripheral surface of the terminal plate protrudes out of the inner wall of the electrode leading-out hole; a sealing member is disposed between the terminal plate and the top cap plate to seal the electrode lead-out hole. Each part of the top cover assembly is connected with each other in the modes of injection molding, riveting or welding and the like, the number of parts is large, the structure is complex, the assembly and manufacturing processes are complicated, the forming efficiency of each part is low, and the precision is not high. Meanwhile, the sealing element is in interference fit with the top cover plate and the electrode terminal to realize the sealing between the electrode terminal and the top cover plate, but the contact area between the sealing element and the electrode terminal or the top cover plate is small, the sealing effect is poor, and the leakage of the battery is often caused after the battery is used for a period of time.

Disclosure of Invention

Based on the problems in the prior art, the utility model provides a battery top cover assembly which is few in parts, only comprises a pole column, a sealing element and a top cover plate, is simple in production process of each part, is high in forming efficiency and can ensure high precision. Simultaneously, through the area of contact between increase sealing member and utmost point post or the lamina tecti, promote sealed effect, make the battery still can not produce the condition of weeping after long-time use.

According to the battery top cover assembly of the utility model, the technical scheme comprises:

a battery top cap assembly, comprising:

a pole column;

the terminal post fixing device comprises a top cover plate, a terminal post leading-out hole is formed in the top cover plate, a first fixing part is arranged above the periphery of the terminal post leading-out hole, a second fixing part is arranged at the lower end of the inner side wall of the terminal post leading-out hole, the first fixing part at least covers one part of the upper surface of a terminal post, and the second fixing part at least covers one part of the lower surface of the terminal post;

the sealing element is arranged between the top cover plate and the pole, a convex ring/groove is arranged on the outer surface of the sealing element, and a groove/convex ring corresponding to the convex ring/groove is arranged on the pole and/or the top cover plate.

Optionally, the sealing member covers a portion of the upper surface and a portion of the lower surface of the pole at the same time.

Optionally, the sealing member includes first sealing portion, first sealing portion sets up in the one end that the second fixed part is close to utmost point post, first sealing portion in utmost point post axial direction toward the direction of keeping away from utmost point post extend, and with the cooperation is supported by the second fixed part to lean on.

Optionally, the pole further includes a first upper surface and a second upper surface, the first upper surface and the second upper surface are not at the same height, and the first fixing portion at least covers a portion of the second upper surface.

Optionally, a gap exists between the first fixing portion and the pole in the radial direction of the pole, and the gap is filled with pouring sealant.

Optionally, the pole is integrally disposed above the upper surface of the second fixing portion.

Optionally, the lower surface of the second fixing portion is flush with the lower surface of the top cover plate.

Optionally, the first fixing portion and/or the second fixing portion are/is a continuous or discontinuous ring structure.

Optionally, the first fixing portion and the second fixing portion are integrally formed with the top cover plate.

Optionally, the potting adhesive is made of an insulating material.

The utility model has the beneficial effects that: the battery top cover assembly structure only comprises the pole, the sealing element and the top cover plate, and has the advantages of simple production process of each part, high forming efficiency and capability of ensuring higher precision. The assembly mode of each part is simple, and the mass production can be realized quickly. Simultaneously, through setting the sealing member to the upper and lower surface of cladding utmost point post, set up the bulge loop on the surface of sealing member, the area of contact between increase sealing member and utmost point post or the lamina tecti promotes sealed effect, makes the battery still can not produce the condition of weeping after long-time use.

Drawings

FIG. 1 is an exploded schematic view of a cap assembly according to one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a header assembly along the length of a header panel according to one embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a header assembly along the width of a header panel according to one embodiment of the present invention;

description of the reference numerals

1 pole

2 sealing element

3 Top cover plate

4 lower plastic part

5 pouring sealant

11 first upper surface

12 second upper surface

13 groove

21 convex ring

22 first seal part

23 seal body part

31 pole leading-out hole

32 first fixed part

33 second fixed part

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Fig. 1 is an exploded structural view of a battery top cap assembly according to an embodiment of the present invention, which shows the overall structure of the respective parts forming the top cap assembly. Fig. 2 is a schematic sectional view of a cap assembly according to an embodiment of the present invention, taken along the length of a cap plate, showing the assembled relationship of the respective parts of the cap assembly from one direction. Fig. 3 is a schematic sectional view of a cap assembly according to an embodiment of the present invention, taken along the width direction of a cap plate, showing the assembly relationship among the respective parts of the cap assembly from another direction.

As shown in fig. 1 to 3, the top cap assembly includes a pole 1, a sealing member 2, and a top cap plate 3.

The pole 1 is a circular sheet or a plate-shaped structure and is divided into a positive pole and a negative pole, the positive pole can be made of metal material aluminum, the negative pole can be made of a composite pole, namely, the upper layer is made of metal material aluminum, and the lower layer is made of metal material copper. The pole 1 has a first upper surface 11 near its center and a second upper surface 12 near its edge, the first upper surface 11 is circular, the second upper surface 12 is circular, and the first upper surface and the second upper surface are not at the same height, in this embodiment, the first upper surface 11 is higher than the second upper surface 12, and a groove 13 is provided on the second surface 12 of the pole 1 and the lower surface of the pole 1, of course, according to an exemplary embodiment of the present invention, the groove 13 may be continuously or discontinuously provided on the outer surface of the pole 1 contacting the sealing member 2.

The sealing member 2 adopts the plastic material to make, and in this embodiment, specific sealing member 2 adopts the fluororubber to make, and sealing member 2 is the annular, and sealing member 2 includes sealed main part 23 and first sealing 22, and sealed main part 23 cross-section is the U-shaped, is first sealing 22 in sealed main part 23 lower extreme one side, and first sealing 22 extends along the axial direction toward the direction of keeping away from utmost point post 1 from sealed main part 23, sealed main part 23 and first sealing 22 integrated into one piece. The surface of the sealing element 2 on one side close to the pole is provided with a convex ring 21 corresponding to the groove 13. Of course, according to an exemplary embodiment of the present invention, the convex ring 21 may also be continuously or discontinuously disposed on the surface of the sealing member 2 on the side close to the top cover plate 3, and the groove 13 corresponding to the convex ring 21 is disposed on the top cover plate 3. I.e. other variants, it is also possible to provide the pole 1 and/or the top cover plate 3 with a collar/groove and correspondingly the surface of the sealing element 2 with a groove/collar adapted to the collar/groove, so that the sealing effect can be further increased by the collar and the groove cooperating with each other.

The top cover plate 3 is substantially thin plate-shaped and has a size and shape matching the opening of the housing so as to be attachable at the opening of the housing. The top lid plate 3 is made of a metal material, and for example, the same metal material as the battery case material can be selected. The top cover plate 3 is provided with two pole leading-out holes 31 (one corresponding to the positive pole and the other corresponding to the negative pole) for leading out the electric energy in the electrode assembly inside the case to the outside of the top cover plate 3. The first fixing portion 32 is further disposed above the periphery of the pole leading-out hole 31, and the first fixing portion 32 is a continuous annular structure as a whole, but, as an example, the first fixing portion 32 may be a discontinuous annular structure, so as to facilitate the rolling of the first fixing portion 32 and to coat the pole 1. The inner side wall surface of the first fixing part 32 is flush with the inner surface of the pole leading-out hole 31. The second fixing portion 33 is further disposed at the lower end of the inner side wall of the pole leading-out hole 31, the second fixing portion 33 is a continuous annular structure as a whole, of course, the second fixing portion 33 may be a discontinuous annular structure, the lower surface of the second fixing portion 33 is flush with the lower surface of the top cover plate 3, and the first fixing portion 32, the second fixing portion 33 and the top cover plate 3 are integrally formed. In addition, in order to maintain the insulation state between the top cap plate 3 and the electrode assembly inside the case, a lower plastic member 4 is disposed below the top cap plate 3, and the lower plastic member 4 is generally made of a plastic material and has a substantially plate shape, and is attached to a surface of the top cap plate 3 facing the inside of the case so as to maintain the insulation state between the top cap plate 3 and the electrode assembly disposed inside the case. Lower plastic part 4 includes two through-holes and the plastic part main part that sets up around the through-hole, and two through-holes are relative with two utmost point posts of setting on the lamina tecti 3 respectively and draw forth hole 31, and plastic part main part is around setting up the periphery that draws forth hole 31 at utmost point post.

When utmost point post 1, sealing

member

2, 3 assembly formation top cap subassemblies of top cap board, the second upper surface 12 and the partial lower surface of sealing member 2 cladding utmost point post 1, its assembly is between utmost point post 1 and top cap board 3, realizes the sealing connection between utmost point post 1 and the top cap board 3. When sealing member 2 assembled utmost point post 1 on, bulge loop 21 and recess 13 cooperation can realize sealing member 2's positioning for sealing member 2 is accurate, quick installation extremely post 1 corresponding position department, improves production efficiency. At the same time, the collar 21 is forced to snap into the groove 13, further enhancing the sealing effect. At this time, the first sealing portion 22 is disposed at one end of the second fixing portion 33 close to the pole 1, and is abutted against and matched with the second fixing portion 33, and the first sealing portion 22 fills a gap between the second fixing portion 33 and the lower plastic 4, so as to further enhance the sealing effect. The cladding of top apron 3 is on the surface of sealed main part 23 keeping away from utmost point post 1 one side, and the indirect second upper surface 12 of cladding utmost point post 1 of first fixed part 32 of top apron 3, the indirect partial lower surface of cladding utmost point post 1 of second fixed part 33 to utmost point post 1 wholly sets up in second fixed part 33 upper surface top, reduces and occupies battery pole piece accommodation space, promotes battery pole piece's effective capacity. Sealing member 2 and

top shroud

3, 1 interference fit of utmost point post for sealing member 2 can be inseparable laminating utmost point post 1, realize the sealing connection between top shroud 3 and utmost point post 1. The first fixing portion 32 and the second fixing portion 33 restrict upward and downward movement of the pole 1, respectively, and prevent the pole 1 and the sealing member 2 from falling off from the top cover plate 3. Further, there is the clearance in first fixed part 32 between utmost point post footpath and utmost point post 1, the clearance intussuseption is filled with casting glue 5 for it is insulating between top shroud 3 and the utmost point post 1, and strengthen utmost point post 1 and top shroud 3's stability of being connected and leakproofness.

While the utility model has been described in detail, those skilled in the art should not understand that they can make any changes in the embodiments and applications without departing from the scope of the utility model.

Claims

1. A battery top cap assembly, comprising:

a pole column;

2. The battery cap assembly of claim 1, wherein the seal covers a portion of the upper surface and a portion of the lower surface of the post simultaneously.

3. The battery cap assembly of claim 2, wherein the sealing member includes a first sealing portion disposed at an end of the second fixing portion adjacent to the terminal post, the first sealing portion extends in a direction away from the terminal post in an axial direction of the terminal post and is in abutting engagement with the second fixing portion.

4. The battery cap assembly of claim 1, wherein the post further comprises a first upper surface and a second upper surface, the first upper surface and the second upper surface not being at a same height, the first securing portion covering at least a portion of the second upper surface.

5. The battery top cap assembly of claim 4, wherein the first fixing portion has a gap between the pole in a radial direction and the pole, and the gap is filled with a potting compound.

6. The battery top cap assembly of claim 5, wherein the post is integrally disposed above an upper surface of the second securing portion.

7. The battery top cap assembly of any one of claims 1-6, wherein a lower surface of the second securing portion is flush with a lower surface of the top cap plate.

8. The battery cap assembly of any one of claims 1-6, wherein the first securing portion and/or the second securing portion is a continuous or discontinuous ring structure.

9. The battery top cap assembly of any one of claims 1-6, wherein the first securing portion and the second securing portion are integrally formed with the top cap plate.

10. The battery top cap assembly of claim 5, wherein the potting adhesive is made of an insulating material.