CN112582716B

CN112582716B - Battery with a battery cell

Info

Publication number: CN112582716B
Application number: CN202011436816.0A
Authority: CN
Inventors: 邱慎照; 乔晓峰
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-07-15
Anticipated expiration: 2040-12-07
Also published as: CN112582716A

Abstract

The application discloses a battery, which comprises a shell, a battery core and a sealing element, wherein the shell is provided with a through hole; the battery cell is arranged in the shell; the sealing element closes the through hole; the battery cell is provided with an avoidance groove; the shell is provided with an annular boss towards the avoidance groove, the annular boss is positioned in the avoidance groove, and the annular boss defines the through hole; the sealing element is accommodated in the through hole and does not exceed the surface of one side of the shell, which is far away from the battery core.

Description

Battery with a battery cell

Technical Field

The application relates to the field of batteries, in particular to a battery.

Background

Batteries, especially button cells, are usually sealed at the filling opening by a sealing nail. In the existing battery, the position of the liquid injection port is a plane, so that after a sealing nail is welded, the sealing nail protrudes out of the surface of a shell, and occupies more thickness space, thereby reducing the Energy Density (Energy Density) of the battery.

Disclosure of Invention

In view of the above, there is a need for a battery, which aims to improve the energy density of the battery.

An embodiment of the application provides a battery, including casing, electric core and sealing member. The housing is provided with a through hole. The battery cell is arranged in the shell. The sealing member closes the through hole. The battery cell is provided with an avoidance groove. The casing is equipped with cyclic annular boss towards dodging the groove, and cyclic annular boss is located and dodges the inslot. The annular boss defines the through-hole. The sealing element is accommodated in the through hole and does not exceed the surface of one side of the shell, which is far away from the battery core.

In one possible implementation, the annular boss further defines a positioning slot. The constant head tank is located the casing is kept away from dodge one side of groove, just the constant head tank with the through-hole intercommunication forms the shoulder hole jointly.

In a possible implementation manner, the bottom wall of the positioning groove and the inner wall of the side of the casing facing the electric core are located on the same plane.

In a possible implementation manner, the bottom wall of the positioning groove is closer to the battery cell than to an inner wall of the casing on a side facing the battery cell.

In a possible implementation manner, a distance between the bottom wall of the positioning groove and a surface of the annular boss facing to the battery core side is equal to a thickness between an inner wall and an outer wall of the casing.

In a possible implementation, the sealing element is provided with a connecting portion which abuts against the bottom wall of the positioning slot.

In a possible implementation manner, the sealing element is provided with a sealing part, and the sealing part is arranged on the connecting part and is accommodated in the through hole.

In one possible implementation, a surface of the sealing portion facing the cell does not extend beyond a surface of the annular boss facing the cell.

In a possible implementation manner, the battery cell includes a plurality of pole pieces stacked, and the avoidance slot is disposed on at least one of the pole pieces.

In a possible implementation manner, the battery cell includes a protection element and a plurality of pole pieces, the pole pieces are sequentially stacked in the casing, the protection element is located on one side of the pole pieces facing the annular boss, and the avoidance groove is disposed on the protection element.

In a possible implementation, the avoidance groove does not pass through the guard.

In a possible implementation, the sealing element is welded or fixed to the housing by adhesive bonding.

According to the battery, the avoiding groove is formed in the battery cell, the annular boss is arranged on the shell and is positioned in the avoiding groove, the sealing element is accommodated in the through hole in the annular boss, the sealing element does not exceed the surface of one side, deviating from the battery cell, of the shell, and space waste caused by the protrusion of the sealing element is avoided. In addition, the battery cell is provided with the avoiding groove, so that the annular boss is convenient to avoid, and the space in the shell can be fully utilized to set the battery cell, so that the space utilization rate in the shell is effectively improved, and the energy density of the battery is improved.

Drawings

Fig. 1 is a schematic view of the structure of a battery in one embodiment of the present application.

Fig. 2 is a cross-sectional view of the battery shown in fig. 1 taken along II-II.

Fig. 3 is an enlarged view of a portion of the cell III shown in fig. 2.

Fig. 4 is a cross-sectional view of a battery in another embodiment of the present application.

Description of the main elements

Battery 100

Housing 10

First cover 101

Second cover 102

Side wall 103

Accommodating space 104

Through-hole 11

Mounting structure 12

Positioning groove 121

Annular boss 122

Battery cell 20

Dodging groove 201

Pole piece 21

Guard 22

Diaphragm 23

Seal 30

Connecting part 31

Sealing part 32

Detailed Description

Technical solutions in embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, and not all embodiments.

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. When an element is referred to as being "disposed on" another element, it can be directly on 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.

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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a battery, which comprises a shell, a battery core and a sealing element, wherein the shell is provided with a through hole; the battery cell is arranged in the shell; the sealing element closes the through hole; the battery cell is provided with an avoidance groove; the shell is provided with an annular boss towards the avoidance groove, the annular boss is positioned in the avoidance groove, and the annular boss defines the through hole; the sealing element is accommodated in the through hole and does not exceed the surface of one side of the shell, which is far away from the battery core.

The battery is provided with the annular boss on the shell, the sealing element is accommodated in the through hole in the annular boss, and the sealing element does not exceed the surface of one side of the shell departing from the battery cell, so that the space waste caused by the protrusion of the sealing element is avoided. In addition, the avoiding groove is formed in the battery cell, so that the annular boss is convenient to avoid, and the space in the shell can be fully utilized to set the battery cell, so that the space utilization rate in the shell is effectively improved, and the energy density of the battery is improved.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.

Referring to fig. 1 and fig. 2, an embodiment of the present disclosure provides a battery 100. The battery 100 includes a case 10, a cell 20, and a sealing member 30. The battery core 20 is arranged in the casing 10. The housing 10 is provided with a through hole 11. The through-hole 11 is used for injecting an electrolyte. The sealing member 30 is provided on the case 10 and closes the through hole 11 to prevent the electrolyte from flowing out.

The housing 10 includes a first cover 101, a second cover 102, and a sidewall 103 connecting the first cover 101 and the second cover 102. The first cover 101 and the second cover 102 are disposed opposite to each other. The first cover 101, the second cover 102 and the sidewall 103 form a receiving space 104. The accommodating space 104 is used for accommodating the battery cell 20 and is filled with the electrolyte. The through hole 11 is disposed on the first cover 101 to communicate the accommodating space 104 with the external environment. The battery cells 20 are stacked in the accommodating space 104 along the direction of the first cover 101 toward the second cover 102.

The housing 10 is provided with a mounting structure 12. The mounting structure 12 is disposed on the first cover 101 and does not exceed the surface of the first cover 101 on the side away from the battery cell 20. The through hole 11 is disposed on the mounting structure 12 and penetrates through the mounting structure 12. The seal 30 is provided in the mounting structure 12 and closes the through hole 11. The mounting structure 12 is used to locate the sealing member 30 in the housing 10 without the sealing member 30 protruding outward.

In some embodiments, the battery 100 is a button cell, the case 10 is substantially cylindrical, and the first cover 101 and the second cover 102 are two opposite approximately circular covers.

Referring to fig. 3, a positioning groove 121 is disposed on a side of the mounting structure 12 away from the battery cell 20. An annular boss 122 is arranged on one side of the mounting structure 12 facing the battery core. The through holes 11 are communicated with the positioning grooves 121 to form stepped holes together. The annular boss 122 defines the through hole 11 and the positioning groove 121, that is, a projection of the positioning groove 121 on the first cover 101 is located within a projection of the annular boss 122 on the first cover 101.

In this embodiment, the positioning groove 121 and the annular boss 122 of the mounting structure 12 are formed on the first cover 101 by one-time processing, so that the projection of the positioning groove 121 is located in the middle of the projection of the annular boss 122. The through hole 11 is located in the middle of the positioning groove 121, and the through hole 11 is located in the middle of the annular boss 122.

The sealing member 30 is disposed in the positioning groove 121, and a side of the sealing member 30 away from the casing 10 does not exceed a surface of a side of the first cover 101 away from the battery cell 20, that is, the sealing member 30 is completely accommodated in the positioning groove 121.

The bottom wall of the positioning groove 121 and the inner wall of the first cover 101 on the side facing the battery cell 20 are located on the same plane, that is, the depth of the positioning groove 121 is the same as the thickness of the first cover 101.

It is understood that, in some embodiments, the bottom wall of the positioning groove 121 may also be closer to the battery cell 20 than the inner wall of the first cover 101 on the side facing the battery cell 20, that is, the depth of the positioning groove 121 is slightly greater than the thickness of the first cover 101. Alternatively, the bottom wall of the positioning groove 121 may be slightly farther from the battery cell 20 than the inner wall of the first cover 101 on the side facing the battery cell 20, that is, the depth of the positioning groove 121 is slightly smaller than the thickness of the first cover 101.

The distance between the bottom wall of the positioning groove 121 and the annular boss 122 is equal to the thickness between the inner wall and the outer wall of the first cover 101, that is, the thickness of the position on the mounting structure 12 where the sealing member 30 is disposed is equal to the thickness of the casing 10.

An avoidance groove 201 is formed in the battery cell 20. The annular boss 122 is located in the avoidance groove 201.

Referring to fig. 3, the battery cell 20 includes a plurality of pole pieces 21 and a protection member 22, and the pole pieces 21 are sequentially stacked in the receiving space 104 along a direction from the first cover 101 to the second cover 102. The protection member 22 is disposed on a side of the stacked pole pieces 21 facing the annular boss 122, and the protection member 22 is disposed opposite to the mounting structure 12 on a side close to the first cover 101 and provided with the avoiding groove 201. The annular boss 122 is received in the avoidance slot 201 of the guard 22.

The avoidance groove 201 does not pass through the guard 22, so that the guard 22 separates the pole piece 21 from the annular boss 122 and the seal 30.

In one embodiment, the guard 22 is a foam.

The cell 20 further comprises a separator 23. The diaphragm 23 is disposed between two adjacent pole pieces 21.

Referring to fig. 4, in another embodiment, the battery cell 20 includes a plurality of stacked pole pieces 21 and a diaphragm 23. The plurality of pole pieces 21 are stacked in the receiving space 104 along a direction of the first cover 101 toward the second cover 102. The avoidance groove 201 is provided on one of the pole pieces 21 and the diaphragm 23 adjacent to the first cover 101 opposite to the mounting structure 12.

It is understood that in other embodiments, the battery cell 20 may not include the protection member 22. The avoidance groove 201 is provided in the one pole piece 21 close to the first cover 101 or in the structure for attaching the consecutive pole pieces 21 and diaphragms 23, but is not limited thereto.

The seal 30 includes a connecting portion 31 and a sealing portion 32. The connecting portion 31 abuts against the bottom wall of the positioning groove 121. The sealing portion 32 is disposed on the connecting portion 31 and is received in the through hole 11, and the sealing portion 32 is used for sealing the through hole 11.

In one embodiment, the connecting portion 31 has a substantially annular shape, and the sealing portion 32 is connected to a middle portion of the connecting portion 31 and seals the middle portion of the connecting portion 31. It is understood that, in other embodiments, the connection portion 31 may also have a circular shape, and the sealing portion 32 is located on a side of the connection portion 31 close to the battery cell 20, but is not limited thereto.

The thickness of the connecting portion 31 in the direction perpendicular to the surface of the first cover 101 is the same as the depth of the positioning groove 121, that is, the surface of the connecting portion 31 away from the battery cell 20 and the surface of the first cover 101 are located on the same plane.

It will be appreciated that in some embodiments, the thickness of the connecting portion 31 may be slightly smaller than the depth of the positioning groove 121. That is, the surface of the connection portion 31 away from the battery cell 20 may not exceed the surface of the first cover 101.

The surface of the sealing portion 32 facing the battery cell 20 and the surface of the annular projection 122 facing the battery cell 20 are located on the same plane, that is, the sealing member 30 does not protrude from the annular projection 122.

It is understood that, in some embodiments, the surface of the sealing portion 32 facing the cell 20 may be slightly farther away from the cell 20 than the surface of the annular boss 122 facing the cell 20. That is, the surface of the seal portion 32 on the side of the battery cell 20 may not exceed the surface of the annular projection 122 on the side of the battery cell 20.

The sealing element 30 is welded to the bottom wall of the positioning groove 121 through a connecting portion 31, and the sealing element 30 may also be fixed to the bottom wall of the positioning groove 121 through glue adhesion.

The battery 100 has the mounting structure 12 on the casing 10, the positioning groove 121 is formed in the mounting structure 12, the connecting portion 31 of the sealing member 30 is disposed on the bottom wall of the positioning groove 121, the sealing member 30 is accommodated in the positioning groove 121, the positioning groove 121 can be used for disposing the sealing member 30, and space waste caused by the protrusion of the sealing member 30 is avoided. In addition, the avoiding groove 201 is formed in the battery cell 20, and the annular boss 122 on the mounting structure 12 is accommodated in the avoiding groove 201, so that the battery cell 20 can fully utilize the accommodating space 104 in the casing 10, the space utilization rate inside the casing 10 is effectively improved, and the energy density of the battery 100 is improved.

Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.

Claims

1. A battery, comprising:

a housing provided with a through hole;

the battery cell is arranged in the shell; and

a sealing member for closing the through hole; the method is characterized in that:

the battery cell is provided with an avoidance groove;

the shell is provided with an annular boss towards the avoiding groove, the annular boss is positioned in the avoiding groove, and the annular boss defines the through hole; and

the sealing element is accommodated in the through hole and does not exceed the surface of one side of the shell, which is far away from the battery core.

2. The battery of claim 1, wherein: the annular boss further defines a positioning groove, the positioning groove is located the shell is far away from one side of the avoidance groove, and the positioning groove is communicated with the through hole to form a stepped hole together.

3. The battery of claim 2, wherein: the sealing element is provided with a connecting part and a sealing part, the connecting part is positioned in the positioning groove and is abutted against the bottom wall of the positioning groove, and the sealing part is arranged on the connecting part and is contained in the through hole.

4. The battery of claim 3, wherein: the surface of the sealing part facing to the battery cell does not exceed the surface of the annular boss facing to the battery cell.

5. The battery of claim 2, wherein: the bottom wall of the positioning groove and the inner wall of one side, facing the battery core, of the shell are located on the same plane.

6. The battery of claim 2, wherein: the bottom wall of the positioning groove is closer to the battery cell relative to the inner wall of the shell facing one side of the battery cell.

7. The battery of claim 2, wherein: the distance between the bottom wall of the positioning groove and the surface of one side, facing the battery core, of the annular boss is equal to the thickness between the inner wall and the outer wall of the shell.

8. The battery of claim 1, wherein: the battery cell comprises a plurality of pole pieces which are superposed, and the avoidance groove is arranged on at least one of the pole pieces.

9. The battery of claim 1, wherein: the battery cell comprises a protection piece and a plurality of pole pieces, the pole pieces are sequentially overlapped in the shell, the protection piece is located on one side, facing the annular boss, of the pole pieces, and the avoidance groove is formed in the protection piece.

10. The battery of claim 9, wherein: the avoidance groove does not pass through the guard.

11. The battery of claim 1, wherein: the sealing element is fixed with the shell in a welding mode or in a bonding mode through colloid.