CN218123581U

CN218123581U - Square battery

Info

Publication number: CN218123581U
Application number: CN202221802012.2U
Authority: CN
Inventors: 季德力; 胡大林; 廖兴群
Original assignee: Guangdong Highpower New Energy Technology Co Ltd
Current assignee: Guangdong Highpower New Energy Technology Co Ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-12-23
Anticipated expiration: 2032-07-13

Abstract

The utility model provides a square battery, which comprises a shell, a top cover, an insulating sealing element and a pole core, wherein the shell is a semi-closed structure with an opening at one end, and the top cover closes the opening of the shell; the positive pole ear electricity of utmost point core is switched on the top cap, the negative pole ear electricity of utmost point core is switched on the casing, utmost point core set up in the casing, just the top cap with be formed with the edges and corners between the lateral wall of casing, the surface of utmost point core with be formed with the corner space between the edges and corners, insulating seal spare respectively with the top cap the edge with the opening sealing connection of casing, insulating seal spare set up in the corner space. The utility model discloses a square battery is through the corner space department with insulating seal setting between utmost point core and casing, promotes energy density.

Description

Square battery

Technical Field

The utility model relates to a lithium cell technical field especially relates to a square battery.

Background

In the existing square battery, positive and negative electrode lugs are led out from the same side of a battery core, a connecting sheet is welded on a square cover plate, and then the purpose of welding and leading out the electrode lugs is achieved by super-welding the positive and negative electrode lugs on the connecting sheet. In the whole process, the connecting sheet is welded on the cover plate, and then the positive electrode lug and the negative electrode lug are welded on the connecting sheet, so that the process is more, and meanwhile, the connecting sheet occupies partial space of the shell, so that the occupied space of the battery cell is reduced, and the energy density is lowered.

On the other hand, the corner position between the side walls of the square winding battery cell is usually circular arc, and cannot be tightly attached to the corner of the casing of the square battery, which results in waste of corner space.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a square battery in the problem to current square battery top cap occupy electric core space and reduce energy density.

The utility model provides a square battery, which comprises a shell, a top cover, an insulating sealing element and a pole core, wherein the shell is a semi-closed structure with an opening at one end, and the top cover seals the opening of the shell; the positive tab electricity of utmost point core is switched on the top cap, the negative pole tab electricity of utmost point core is switched on the casing, utmost point core set up in the casing, just the top cap with be formed with the edges and corners between the lateral wall of casing, the surface of utmost point core with be formed with the corner space between the edges and corners, insulating seal respectively with the edge of top cap with the opening sealing connection of casing, insulating seal set up in the corner space.

Optionally, the insulating sealing element includes a first connecting portion and a second connecting portion, the first connecting portion is a sheet-shaped ring structure, and the second connecting portion is a tubular thin-walled structure; one surface of the first connecting part, which is far away from the pole core, is hermetically connected with the outer edge of the top cover, and the projection of the outer edge of the top cover on the first connecting part is positioned on the first connecting part; the casing cover is established the periphery of second connecting portion and with the second connecting portion are connected, first connecting portion one end with the second connecting portion are kept away from open-ended one end is connected.

Optionally, the square battery further comprises a reinforcement, the reinforcement comprises a first reinforcement and a second reinforcement, the first reinforcement is a sheet-shaped ring structure, the second reinforcement is a tubular thin-walled structure, the first reinforcement is disposed on the first connecting portion, the second reinforcement is disposed on the second connecting portion, and the second reinforcement is connected with the first reinforcement.

Optionally, the insulating seal is arranged on the periphery of the reinforcing part, the inner diameter of the first reinforcing part is larger than that of the first connecting part, and the inner edge of the first reinforcing part extends to the position below the top cover and is located below the first connecting part; one end, far away from the first reinforcing part, of the second reinforcing part extends to one side of the shell and is located on the second connecting part.

Optionally, the reinforcement is disposed on the outer periphery of the insulating seal, a gap is disposed between an inner edge of the first reinforcement portion and an outer edge of the top cover, and a gap is disposed between one side of the second reinforcement portion close to the housing and the housing.

Optionally, the reinforcement is a metal plate or a glass fiber plate.

Optionally, the casing includes a bottom cover and a surrounding wall surrounding one side of the bottom cover, the periphery of the bottom cover is welded to the edge of the surrounding wall, and the negative electrode tab of the pole core is electrically connected to the surrounding wall or the bottom cover.

Optionally, the insulating sealing element is a sealant or a rubber element.

Optionally, the pole core is a winding core or a lamination.

The utility model discloses in, through the corner space department with insulating seal setting between utmost point core and edges and corners, promote energy density, make full use of the corner space. The top cover is connected with the shell in a sealing mode through the insulating sealing piece, the insulating sealing piece is connected with the edge of the top cover, the connection area of the top cover and the pole lug on the pole core is increased, and the bonding strength of the pole lug is improved. Casing one end opening, top cap seal shell's opening compares in traditional I shape top cap, the utility model discloses a top cap has increased the capacity of casing, has improved space utilization.

Drawings

Fig. 1 is a schematic top view of a prismatic battery according to an embodiment of the present invention without a top cap;

fig. 2 is a schematic cross-sectional view of a square battery according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pole piece of a square battery according to an embodiment of the present invention.

The reference numbers in the drawings of the specification are as follows:

1. a housing; 11. a bottom cover; 12. a surrounding wall;

2. a top cover; 3. an insulating seal; 31. a first connection portion; 32. a second connecting portion;

4. a pole piece; 41. a positive tab; 42. a negative tab;

5. a reinforcement; 51. a first reinforcing portion; 52. a second reinforcement portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

As shown in fig. 1-3, a prismatic battery according to an embodiment of the present invention includes a case 1, a top cap 2, an insulating sealing member 3, and a pole piece 4, where the case 1 is a semi-closed structure with an opening at one end, and the top cap 2 closes the opening of the case 1; the positive tab 41 electricity conductance of utmost point core 4 the top cap 2, the negative pole tab 42 electricity conductance of utmost point core 4 casing 1, utmost point core 4 set up in the casing 1, just top cap 2 with be formed with the edges and corners between the lateral wall of casing 1, the surface of utmost point core 4 with be formed with the corner space between the edges and corners, insulating seal 3 respectively with the edge of top cap 2 with the opening sealing connection of casing 1, insulating seal set up in the corner space.

Specifically, the top cover 2 and the case 1 are both made of a conductive material.

In the present embodiment, by providing the insulating seal member 3 at the corner space between the pole core 4 and the corner, the energy density is increased, and the corner space is fully utilized. The top cover 2 is connected with the shell 1 in a sealing mode through the insulating sealing element 3, the insulating sealing element 3 is connected with the edge of the top cover 2, the connection area of the pole lugs on the top cover 2 and the pole core 4 is increased, and the bonding strength of the pole lugs is improved. 1 one end opening of casing, top cap 2 seal casing 1's opening compares in traditional I shape top cap 2, the utility model discloses a top cap 2 has increased the capacity of the 1 body of casing, has improved space utilization.

As shown in fig. 2, in some embodiments of the present invention, the insulating sealing member 3 includes a first connecting portion 31 and a second connecting portion 32, the first connecting portion 31 is a sheet-shaped ring structure, and the second connecting portion 32 is a tubular thin-walled structure. One surface of the first connecting portion 31, which is away from the cavity, is connected with the outer edge of the top cover 2 in a sealing manner, and the projection of the outer edge of the top cover 2 on the first connecting portion 31 is located on the first connecting portion 31. Casing 1 cover is established the periphery of second connecting portion 32 and with second connecting portion 32 are connected, first connecting portion 31 with form 90 corners between the second connecting portion 32, and realize top cap 2 and casing 1's corner insulating connection.

As shown in fig. 2, in some embodiments of the present invention, the prismatic battery further includes a reinforcing member 5, the reinforcing member 5 includes a first reinforcing part 51 and a second reinforcing part 52, the first reinforcing part 51 is a sheet-shaped ring structure, the second reinforcing part 52 is a tubular thin-walled structure, and the first reinforcing part 51 is disposed on the first connecting part 31 to increase the structural strength of the first connecting part 31. The second reinforcing part 52 is disposed on the second connecting part 32 for increasing the structural strength of the second connecting part 32, and the second reinforcing part 52 is connected with the first reinforcing part 51

As shown in fig. 2, in some embodiments of the present invention, the insulating sealing member 3 is disposed at the periphery of the reinforcing member 5, and the inner edge of the first reinforcing portion 51 extends to the lower portion of the top cap 2 and is located below the first connecting portion 31, so as to support the first connecting portion 31, increase the structural strength of the first connecting portion 31, and make the reinforcing member 5 have waterproof performance. One end of the second reinforcing part 52, which is far away from the first reinforcing part 51, extends to one side of the shell 1 and is positioned on the second connecting part 32, so that the space occupied by the winding core is reduced.

In some embodiments of the present invention, the reinforcement 5 is disposed at the periphery of the insulating sealing member 3, a gap is provided between the inner edge of the first reinforcement 51 and the outer edge of the top cover 2, the second reinforcement 52 is close to one side of the casing 1 and a gap is provided between the casing 1, so as to avoid the contact between the reinforcement 5 and the top cover 2 and the casing 1.

In some embodiments of the present invention, the reinforcement 5 is a metal plate or a glass fiber plate. Specifically, the metal plate is an aluminum plate, a nickel plate, or a copper plate. The structural strength is increased by providing the reinforcing member 5, while the waterproof performance is enhanced.

As shown in fig. 2, in some embodiments of the present invention, the housing 1 includes a bottom cover 11 and a surrounding wall 12 surrounding the bottom cover 11, the periphery of the bottom cover 11 is welded to the edge of the surrounding wall 12, and the negative electrode tab 42 of the pole piece 4 is electrically connected to the surrounding wall 12 or the bottom cover 11. The bottom cover 11 and the surrounding wall 12 are of a split structure, so that the square battery can be assembled conveniently.

In some embodiments of the present invention, the insulating and sealing member 3 is a sealant or a rubber member. The insulating seal 3 may be made of resin.

In some embodiments of the present invention, the pole piece 4 is a roll core or a lamination.

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, those skilled in the art will understand that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. Such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A square battery is characterized by comprising a shell, a top cover, an insulating sealing element and a pole core, wherein the shell is of a semi-closed structure with one open end, and the top cover closes the open end of the shell; the positive tab electricity of utmost point core is switched on the top cap, the negative pole tab electricity of utmost point core is switched on the casing, utmost point core set up in the casing, just the top cap with be formed with the edges and corners between the lateral wall of casing, the surface of utmost point core with be formed with the corner space between the edges and corners, insulating seal respectively with the edge of top cap with the opening sealing connection of casing, insulating seal set up in the corner space.

2. The prismatic battery according to claim 1, wherein the insulating seal member comprises a first connecting portion and a second connecting portion, the first connecting portion is a sheet-ring structure, and the second connecting portion is a tubular thin-walled structure; one surface of the first connecting part, which is far away from the pole core, is hermetically connected with the outer edge of the top cover, and the projection of the outer edge of the top cover on the first connecting part is positioned on the first connecting part; the casing cover is established the periphery of second connecting portion and with the second connecting portion are connected, first connecting portion one end with the second connecting portion are kept away from open-ended one end is connected.

3. The square battery according to claim 2, further comprising a reinforcing member, wherein the reinforcing member comprises a first reinforcing portion and a second reinforcing portion, the first reinforcing portion is a sheet-shaped ring structure, the second reinforcing portion is a tubular thin-walled structure, the first reinforcing portion is disposed on the first connecting portion, the second reinforcing portion is disposed on the second connecting portion, and the second reinforcing portion is connected to the first reinforcing portion.

4. The prismatic battery according to claim 3, wherein the insulating seal member is provided at the outer periphery of the reinforcing member, and the inner edge of the first reinforcing portion extends to below the top cover and below the first connecting portion; one end, far away from the first reinforcing part, of the second reinforcing part extends to one side of the shell and is located on the second connecting part.

5. The prismatic battery according to claim 3, wherein the reinforcing member is provided on the outer periphery of the insulating seal member, a gap is provided between the inner edge of the first reinforcing portion and the outer edge of the top cover, and a gap is provided between the side of the second reinforcing portion adjacent to the case and the case.

6. The prismatic battery according to claim 3, wherein the reinforcing member is a metal plate or a glass fiber plate.

7. The prismatic battery according to claim 1, wherein the case comprises a bottom cover and a surrounding wall provided around one side of the bottom cover, the outer circumference of the bottom cover is welded to the edge of the surrounding wall, and the negative electrode tab of the pole piece is electrically connected to the surrounding wall or the bottom cover.

8. The prismatic battery according to claim 1, wherein the insulating sealing member is a sealant or a rubber member.

9. The prismatic battery according to claim 1, wherein the pole core is a roll core or a laminate.