CN218677343U

CN218677343U - Novel connection structure of power battery and battery top cap and lower plastic

Info

Publication number: CN218677343U
Application number: CN202223299291.8U
Authority: CN
Inventors: 尤军; 崔东旭; 吴韬
Original assignee: Shenzhen Exxon New Energy Technology Co ltd
Current assignee: Shenzhen Exxon New Energy Technology Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-03-21
Anticipated expiration: 2032-12-08

Abstract

The utility model discloses a novel connection structure of battery top cap and lower plastic, include top cap piece and plastic part down. The top cover plate is provided with a first surface and a second surface which are oppositely distributed in the thickness direction, the first surface is provided with a connecting structure, and the connecting structure comprises a counter bore arranged on the first surface and an inverted buckle structure arranged in the counter bore. The lower plastic part is provided with a hot melting column which is filled in the counter bore in a melting way and is mutually buckled with the inverted buckle structure. The utility model also discloses a power battery, including the novel connection structure of above-mentioned battery top cap and lower plastic. Above-mentioned power battery and battery top cap and novel connection structure of plastic down have simplified down the fastening of being connected of plastic part and top cap piece, and the top cap piece is with the assembly non-deformable of plastic part down, and with many relative assemblies of independent assembly of top cap piece and plastic part down more efficient to ensure that the outward appearance does not take place the variation, also avoided the physical force that the fit-up gap produced to cause the friction injury to inside pole piece.

Description

Novel connection structure of power battery and battery top cap and lower plastic

Technical Field

The utility model relates to a power battery technical field, concretely relates to novel connection structure of power battery and battery top cap and lower plastic.

Background

Because the power battery (such as a lithium ion battery) has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, the power battery is widely used in portable electronic equipment such as mobile phones, digital cameras, portable computers and the like, has wide application prospects in large and medium-sized electric equipment such as electric vehicles such as electric automobiles, electric bicycles and the like, energy storage facilities and the like, and becomes a key for solving global problems such as energy crisis, environmental pollution and the like.

Power battery is including top cap piece and lower plastic, top cap piece and need fix down between the plastic, and it is fixed that present top cap piece and lower plastic form through a plurality of accessories combination, and the top cap piece does not have plastic connection structure under the design, leads to top cap piece and lower plastic assembling process complicacy, and production efficiency is low, has increased the cost.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to form fixedly through a plurality of accessories to form to current top cap piece and lower plastic, leads to top cap piece and lower plastic assembling process complicacy, problem that production efficiency is low, provides a novel connection structure of power battery and battery top cap and lower plastic.

The utility model provides a novel connection structure of battery top cap and lower plastic, includes:

the top cover plate is provided with a first surface and a second surface which are oppositely distributed in the thickness direction, the first surface is provided with a connecting structure, and the connecting structure comprises a counter bore arranged on the first surface and an inverted buckle structure arranged in the counter bore; and

the lower plastic part is provided with a hot melting column, and the hot melting column is filled in the counter bore in a melting way and is buckled with the inverted buckle structure.

In one embodiment, the inverted structure comprises a column body arranged on the bottom surface of the counter bore and an enlarged part arranged at the top end of the column body, and the enlarged part extends outwards to exceed the side wall of the column body.

In one embodiment, the enlarged portion and the post are integrally formed.

In one embodiment, the top end of the column body is pressed by the pier and extends outwards to form the enlarged part.

In one embodiment, the enlarged portion has a connecting surface facing the lower plastic part, and the connecting surface is perpendicular to an axis of the enlarged portion.

In one embodiment, the axis of the post is coaxial with the axis of the counterbore, and the enlarged portion is coaxial with the post.

In one embodiment, the heat-fusible column fills the space between the counter bore and the undercut.

In one embodiment, the top cover plate is provided with a positive electrode hole and a negative electrode hole, at least one connecting structure is arranged around the positive electrode hole and the negative electrode hole, and the two groups of lower plastic parts are respectively arranged at the positive electrode hole and the negative electrode hole through the connecting structures.

In one embodiment, four connecting structures are arranged around the positive electrode hole and the negative electrode hole, and the four connecting structures are distributed on the first surface in a matrix manner.

A power cell, comprising:

the novel connection structure of battery top cap and lower plastic as above-mentioned arbitrary one.

The novel connecting structure of the power battery, the battery top cover and the lower plastic has the following advantages at least:

lower hot melt post on the plastic part to the melting is filled in the counter bore and with the mutual lock joint of back-off structure, the realization will be down the plastic part assemble on the top cap piece, the fastening of being connected of plastic part and top cap piece has been simplified down, the top cap piece is with the assembly non-deformable of lower plastic part, and with the top cap piece with many relative assemblies of plastic part independent assembly down more efficient, and ensure that the outward appearance does not take place the variation, the physical force that has also avoided the fit-up gap to produce causes the friction injury to inside pole piece.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

FIG. 1 is a diagram illustrating a novel connection structure between a top cap and a lower plastic of a battery according to an embodiment;

FIG. 2 is a schematic view of the construction of the top flap of FIG. 1;

FIG. 3 is a cross-sectional view of the novel connection structure of the top cap and the lower plastic of the battery shown in FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is a schematic view of the connection structure of FIG. 3;

FIG. 6 is a top view of the top flap shown in FIG. 2;

fig. 7 is a bottom view of the top cover sheet shown in fig. 2.

Reference numerals:

10-top cover plate, 101-first surface, 102-second surface, 20-connecting structure, 22-counter bore, 24-inverted buckle structure, 242-column, 244-enlarged part, 244 a-inner peripheral surface, 244 b-connecting surface, 30-positive pole hole, 40-negative pole hole, 50-lower plastic part and 52-hot melt column.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many other forms than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, a power battery according to an embodiment includes a novel connection structure for a battery top cover and a lower plastic, so as to achieve independent assembly of a top cover plate 10 and a lower plastic part 50.

Referring to fig. 2 and 3 together, in particular, the novel connection structure for the battery top cover and the lower plastic includes a top cover plate 10 and a lower plastic part 50. The top coversheet 10 has a first surface 101 and a second surface 102 which are oppositely distributed in the thickness direction. Wherein, when the top cover sheet 10 is assembled to the battery case, the first surface 101 is a surface facing the inside of the battery case, and the second surface 102 is a surface facing the outside.

The first surface 101 is provided with a connecting structure 20, and the connecting structure 20 includes a counter bore 22 provided on the first surface 101 and an inverted structure 24 provided in the counter bore 22. The lower plastic part 50 has a heat-fusible column 52, and the heat-fusible column 52 is filled in the counter bore 22 by melting and is buckled with the inverted structure 24, so that the lower plastic part 50 is assembled on the top cover plate 10.

Above-mentioned battery top cap and lower novel connection structure of plastic can adopt modes such as ultrasonic welding to heat up and melt hot melt post 52, and the melt after the melting is filled in counter bore 22, treats that melt solidifies the back and the mutual lock joint of back-off structure 24, guarantees the joint strength between plastic part 50 and the top cap piece 10 down, avoids plastic part 50 and the pine of top cap piece 10 to take off down.

Referring to fig. 4 and 5, in one embodiment, the undercut 24 includes a post 242 and an enlarged portion 244, the post 242 is mounted on the bottom surface of the counterbore 22, the enlarged portion 244 is disposed at the top end of the post 242, and the enlarged portion 244 extends outwardly beyond the sidewall of the post 242. The enlarged portion 244 has an inner circumferential surface 244a facing inward, and after the melt filled in the counterbore 22 is solidified, the solidified melt abuts against the inner circumferential surface 244a to achieve mutual engagement.

In one embodiment, the axis of the post 242 is coaxial with the axis of the counterbore 22 and the enlarged portion 244 is disposed coaxially with the post 242. That is, the undercut structure 24 is disposed at the center of the counterbore 22, so that the solidification around the undercut structure 24 is the same, and the stress on the undercut structure 24 is uniform and the lower plastic part 50 is stably mounted.

In one embodiment, counterbore 22 is a circular hole, cylinder 242 is a cylinder 242, and enlarged portion 244 is circular. It will be appreciated that in other embodiments, the shape of the counterbore 22, the cylinder 242, and the enlarged portion 244 may be specifically configured as desired, such as triangular, square, hexagonal, etc.

In one embodiment, the enlarged portion 244 and the post 242 are integrally formed to ensure the force-bearing capability of the undercut 24. Specifically, the top ends of the posts 242 may be swaged, and the top ends of the posts 242 may be compressed, causing the material to extend outwardly to form the enlarged portions 244.

In addition to the above embodiments, the enlarged portion 244 has a connecting surface 244b facing the lower plastic part 50, and the connecting surface 244b is perpendicular to the axis of the enlarged portion 244. That is, the connection surface 244b of the enlarged portion 244 contacting the lower plastic member 50 is a horizontal surface, so that the lower plastic member 50 can be attached to the first surface 101 of the top cover after the lower plastic member 50 is assembled to the top cover 10.

In one embodiment, the heat stake 52 is sized and sized appropriately, i.e., the heat stake 52 is required to fill the space between the counterbore 22 and the undercut 24. Specifically, the counter bore 22 is filled with the molten liquid after the hot melting column 52 is melted, so that the space of the counter bore 22 is filled with the solidified substance formed by the hot melting column 52, and the connection strength between the lower plastic part 50 and the top cover plate 10 is ensured.

Referring to fig. 6 and 7, in one embodiment, the top cover 10 has a positive electrode hole 30 and a negative electrode hole 40, and the positive electrode hole 30 and the negative electrode hole 40 are spaced apart from each other on the top cover 10 and located at two ends of the top cover 10. When the power battery is assembled, the positive pole column penetrates out of the positive pole hole 30, and the negative pole column penetrates out of the negative pole hole 40. Wherein, all be equipped with at least one connection structure 20 around anodal hole 30 and negative pole hole 40, two sets of plastic parts 50 down are installed respectively in anodal hole 30 and negative pole hole 40 department through connection structure 20.

On the basis of the above embodiment, further, four connection structures 20 are disposed around each of the positive electrode hole 30 and the negative electrode hole 40, and the four connection structures 20 are distributed in a matrix on the first surface 101. That is, the four connection structures 20 are arranged in two rows and two columns in a matrix, the positive electrode hole 30 is located in the middle of the four connection structures 20, and the negative electrode hole 40 is located in the middle of another group of the four connection structures 20.

Above-mentioned power battery and battery top cap and novel connection structure of plastic down have simplified down plastic part 50 and top cap piece 10 be connected the fastening, top cap piece 10 and plastic part 50's assembly non-deformable down, and with top cap piece 10 and lower plastic part 50 independent assembly many relatively assembly more efficient to ensure that the outward appearance does not take place the variation, also avoided the physical force that the fit-up gap produced to cause the friction injury to inside pole piece.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a novel connection structure of battery top cap and lower plastic which characterized in that includes:

2. The novel connection structure of the battery top cover and the lower plastic as claimed in claim 1, wherein the inverted structure comprises a column body arranged on the bottom surface of the counter bore and an enlarged portion arranged at the top end of the column body, and the enlarged portion extends outwards beyond the side wall of the column body.

3. The novel connecting structure of the battery top cover and the lower plastic cement as claimed in claim 2, wherein the enlarged portion and the column are integrally formed.

4. The novel connection structure of the battery top cover and the lower plastic cement as claimed in claim 3, wherein the top end of the column is pressed by the pier and extends outwards to form the enlarged portion.

5. The novel connection structure of the battery top cap and the lower plastic as claimed in claim 4, wherein the enlarged portion has a connection surface facing the lower plastic, and the connection surface is perpendicular to an axis of the enlarged portion.

6. The novel connection structure of the battery top cover and the lower plastic cement as claimed in claim 2, wherein the axis of the cylinder is coaxial with the axis of the counterbore, and the enlarged portion and the cylinder are coaxially arranged.

7. The novel connection structure of battery top cap and lower plastic of any one of claims 1-6, characterized in that the heat-fusible column fills the space between the counter bore and the inverted structure.

8. The novel connection structure for the battery top cover and the lower plastic according to any one of claims 1 to 6, wherein the top cover plate is provided with a positive electrode hole and a negative electrode hole, at least one connection structure is arranged around each of the positive electrode hole and the negative electrode hole, and two sets of the lower plastic are respectively mounted at the positive electrode hole and the negative electrode hole through the connection structures.

9. The novel connection structure for the battery top cover and the lower plastic according to claim 8, wherein four connection structures are disposed around the positive electrode hole and the negative electrode hole, and the four connection structures are distributed in a matrix on the first surface.

10. A power cell, comprising:

the novel connection structure of battery top cover and lower plastic of any one of claims 1-9.