CN216648442U

CN216648442U - Steel shell battery and shell thereof

Info

Publication number: CN216648442U
Application number: CN202122755517.XU
Authority: CN
Inventors: 曾琪; 陈贤锐; 韩冰; 郑开元; 苏轼; 纪荣进; 李聪; 郑明清; 陈杰
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-05-31
Anticipated expiration: 2031-11-11

Abstract

The utility model discloses a steel shell battery and a shell thereof, wherein the shell comprises a first shell, a second shell and a third shell, the first shell is a cylindrical structure which is surrounded by a first side wall and is provided with a first opening and a second opening, and the first side wall is provided with a first fixing part and a second fixing part at the first opening and the second opening respectively; the second shell comprises a first bottom wall and a second side wall which is connected with the edge of the first bottom wall to form a cavity with an opening, and the second side wall is provided with a third fixing part; the second shell comprises a second bottom wall and a third side wall which is connected with the edge of the second bottom wall to form a cavity with an opening, the third side wall is provided with a fourth fixing part, the first fixing part is in clamping welding with the third fixing part, and the second fixing part is in clamping welding with the fourth fixing part. The utility model provides a first casing, second casing and third casing pass through the fixed part chucking welding, and the space volume of steel-shelled battery can not be wasted to this structure, and the damage of high temperature to electric core when can avoid the welding simultaneously well.

Description

Steel shell battery and shell thereof

Technical Field

The utility model relates to the field of lithium ion battery manufacturing, in particular to a steel shell battery and a shell thereof.

Background

The shell structure of the steel shell battery in the prior art is mostly the upper and lower casing combination that contains the multiple flange limit structure of four sides because the flange limit is mostly the protrusion structure to increased the whole volume of electric core, perhaps directly regard as the welding position with two-layer thin steel shell overlapping department, and this position is very little with naked electric core interval, direct welding leads to inside electric core part to overheat easily and produces the defect.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, an object of the present invention is to provide a steel-shelled battery and a housing thereof, in which a fixing portion is additionally disposed on a housing, and the housing are connected in a nested manner, so as to solve the problem that the battery cell is damaged due to overheating caused by the increase of the overall volume of the battery cell and the over-close distance between the welding position and the battery cell.

In order to achieve the purpose, the utility model adopts the following technical scheme:

in a first aspect, the present invention provides a can for a steel-shelled battery, comprising:

the first shell is a cylindrical structure which is surrounded by a first side wall and is provided with a first opening and a second opening, and a first fixing part and a second fixing part are respectively arranged on the first opening and the second opening of the first side wall;

the second shell comprises a first bottom wall and a second side wall which is connected with the edge of the first bottom wall to form a cavity with an opening, and the second side wall is provided with a third fixing part;

the second shell comprises a second bottom wall and a third side wall which is connected with the edge of the second bottom wall to form a cavity with an opening, and the third side wall is provided with a fourth fixing part;

the first fixing part is in clamping welding with the third fixing part, and the second fixing part is in clamping welding with the fourth fixing part.

In one embodiment, the first sidewall has an outer diameter greater than an outer diameter of the second sidewall, and the second sidewall has an outer diameter equal to an outer diameter of the third sidewall.

In one embodiment, the cross-sectional shapes of the first fixing portion, the second fixing portion, the third fixing portion and the fourth fixing portion in the radial direction include one or more combinations of a regular trapezoid, an inverted trapezoid, a cube and a rectangular parallelepiped.

In one embodiment, the first fixing portion, the second fixing portion, the third fixing portion and the fourth fixing portion have the same cross-sectional shape.

In one embodiment, the first fixing portion and the second fixing portion are formed by extending the first sidewall, the third fixing portion is formed by extending the second sidewall, and the fourth fixing portion is formed by extending the third sidewall.

In one embodiment, a projection of the second housing in the radial direction does not intersect a projection of the third housing in the radial direction.

In one embodiment, a projected height of the second housing in the radial direction is the same as a projected height of the third housing in the radial direction.

In one embodiment, the first shell and the second shell are of an integrally formed structure, the diameter of the first side wall is equal to that of the second side wall, and the diameter of the first side wall is larger than that of the third side wall.

In a second aspect, the present invention further provides a steel-shell battery, which includes an electric core and the above-mentioned housing for accommodating the electric core.

A tab is led out from one end of the battery cell and electrically connected with the shell.

The utility model has the following beneficial effects:

compared with the prior art, the battery shell has a flange structure, which causes a bulge, so that the overall volume of the battery outwards increases, and the increased volume is an ineffective volume and cannot be used for accommodating the battery core. This application has taken nested mode combination shell, passes through the fixed part with second casing, third casing respectively with first casing and is connected with nested formula, can additionally not increase the too many volume of battery, and the volume space that increases can be used for holding utmost point ear, can not cause the space extravagant, and the fixed part of this application can make second casing, third casing respectively with first casing chucking, need not to fix a position the casing when the welding with the shell of flange limit structure.

In addition, directly regard as welding position with two-layer thin steel shell overlapping department among the prior art, nevertheless this position is very little with naked electric core interval, and direct welding leads to inside electric core part overheated production defect easily, and the welding area of this application is located the fixed part, and the distance of welding area and electric core is the thickness of two fixed parts and two lateral walls at least promptly, can fine increase and naked electric core between the distance to avoid inside electric core impaired because of the high temperature that produces when welding.

Drawings

Fig. 1 is one of the schematic structural diagrams of the case of the steel-can battery according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a steel-can battery according to an embodiment of the utility model;

fig. 3 is a second schematic view of the structure of the outer case of the steel-can battery according to an embodiment of the utility model;

fig. 4 is a third schematic view of a housing structure of a steel-shelled battery according to an embodiment of the utility model;

FIG. 5 is a fourth schematic view of the structure of the outer case of the steel-can battery according to an embodiment of the utility model;

FIG. 6 is a fifth schematic view of the housing structure of a steel-shelled battery according to an embodiment of the utility model;

FIG. 7 is a sixth schematic view of the structure of the housing of the steel-shelled battery according to the embodiment of the utility model;

fig. 8 is a seventh schematic view of the structure of the outer case of the steel-shelled battery according to the embodiment of the utility model;

fig. 9 is an eighth schematic structural diagram of a case of a steel-shelled battery according to an embodiment of the utility model;

fig. 10 is a ninth schematic view of the structure of the outer case of the steel-can battery according to an embodiment of the utility model;

fig. 11 is a cross-sectional view of a housing structure of a steel-can battery according to an embodiment of the utility model;

fig. 12 is an eleventh schematic view of the housing structure of the steel-can battery according to an embodiment of the utility model.

The labels in the figure are: 100-a housing; 110-a first housing; 111-a first side wall; 112-a first fixed part; 113-a second stationary part; 120-a second housing; 121-a first bottom wall; 122-a second sidewall; 123-a third fixing part; 130-a third housing; 131-a second bottom wall; 132-a third sidewall; 133-a fourth fixation section; 200-electric core; 210-a tab; 300-a weld zone; x-radial; y-axis direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but 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 application.

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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

As shown in fig. 1 to 7, the present embodiment provides a steel-casing battery, which includes a battery cell 200 and a casing 100 for accommodating the battery cell 200.

The battery cell 200 is provided with a tab 210, and the tab 210 is led out from one end of the battery cell 200 and electrically connected with the casing 100.

The case 100 of the steel-shelled battery includes a first case 110, a second case 120, and a third case 130. The first housing 110 is a cylindrical structure surrounded by a first sidewall 111 and having a first opening and a second opening, the first sidewall 111 is provided with a first fixing portion 112 and a second fixing portion 113 at the first opening and the second opening, respectively; the second housing 120 includes a first bottom wall 121 and a second side wall 122 connected to an edge of the first bottom wall 121 to form a cavity with an opening, and the second side wall 122 is provided with a third fixing portion 123; the second housing 120 includes a second bottom wall 131 and a third sidewall 132 connected to an edge of the second bottom wall 131 to form an open cavity, and the third sidewall 132 is provided with a fourth fixing portion 133; the first fixing portion 112 is tightly welded to the third fixing portion 123, and the second fixing portion 113 is tightly welded to the fourth fixing portion 133.

In the present embodiment, the outer diameter of the first sidewall 111 is larger than the outer diameter of the second sidewall 122, and the outer diameter of the second sidewall 122 is equal to the outer diameter of the third sidewall 132, so that the second shell 120 and the third shell 130 are nested inside the first shell 110.

The raised edge structure of the casing 100 is configured to be raised relative to the flange of the prior art, thereby resulting in an overall volume increase of the battery outward, and the increased volume is an ineffective volume and cannot be used for accommodating the battery core 200. This application has taken nested mode combination shell 100, with second casing 120, third casing 130 respectively with first casing 110 through the fixed part with the nested formula is connected, can not additionally increase too much volume of battery, and the volume space that increases can be used for holding utmost point ear 210, can not cause the space extravagant, and the fixed part of this application can make second casing 120, third casing 130 respectively with first casing 110 chucking, need not to fix a position the casing with the shell 100 of flange limit structure when the welding.

In the present embodiment, the first fixing portion 112 and the second fixing portion 113 are formed by extending the first sidewall 111 inward, the third fixing portion 123 is formed by extending the second sidewall 122 outward, and the fourth fixing portion 133 is formed by extending the third sidewall 132 outward. Through the above arrangement, the first fixing portion 112, the second fixing portion 113 and the first sidewall 111 are integrally formed, the third fixing portion 123 and the second sidewall 122 are integrally formed, and the fourth fixing portion 133 and the third sidewall 132 are integrally formed, so that the strength of the fixing portion and the strength of the shell structure are improved, and the integral forming process omits a subsequent process of welding the fixing portion on the shell, thereby improving the efficiency. Meanwhile, the fixing portion is disposed at the opening to prevent the first case 110 from encroaching on the internal volume of the battery, for example, the fixing portion is disposed at the middle position of the side wall, the entire thickness of the side wall of the battery is the thickness of the two cases, and the fixing portion is disposed at the opening, the position of the battery except the fixing portion is the thickness of the two cases, and the other positions are the thickness of one case.

For directly regard as welding position with two-layer thin steel shell overlapping department among the prior art, to but this position is very little with naked electric core 200 interval, direct welding leads to inside electric core 200 part to overheat easily and produces the defect, and the weld zone 300 region of this application is located the fixed part, and the distance of weld zone and electric core 200 is two fixed parts and the thickness of two lateral walls at least, can fine increase and naked electric core 200 between the distance to avoid inside electric core 200 to be impaired because of the high temperature that produces during the welding.

The cross-sectional shapes of the first fixing portion 112, the second fixing portion 113, the third fixing portion 123 and the fourth fixing portion 133 include one or a combination of a regular trapezoid, an inverted trapezoid, a cube and a cuboid, and the cross-sectional shapes of the first fixing portion 112, the second fixing portion 113, the third fixing portion 123 and the fourth fixing portion 133 are the same. Through the arrangement, the first fixing portion 112, the third fixing portion 123, the second fixing portion 113 and the fourth fixing portion 133 can be well fixed together in pairs, and the first fixing portion 112, the second fixing portion 113, the third fixing portion 123 and the fourth fixing portion 133 are identical in shape, so that the fixing portions can be well matched with one another, the contact surface of the fixing portions is maximized, the first shell 110 and the second shell 120, and the first shell 110 and the third shell 130 can be nested tightly, and the structural strength of the shell 100 is guaranteed.

In an embodiment, the projection of the second housing 120 in the radial direction X does not intersect the projection of the third housing 130 in the radial direction X. Since the second housing 120 and the third housing 130 are both nested with the first housing 110, the volume of the outer shell is maximized when the projection of the second housing 120 along the radial direction X does not intersect the projection of the third housing 130 along the radial direction X.

The projected height of the second housing 120 in the radial direction X is the same as the projected height of the third housing 130 in the radial direction X. The projection height of the first housing 110 along the radial direction X may be greater than the projection height of the second housing 120 along the radial direction X, and may also be less than the projection height of the second housing 120 along the radial direction X.

Example 2

As shown in fig. 8 to 9, unlike embodiment 1, in the present embodiment, the outer diameter of the first sidewall 111 is smaller than the outer diameter of the second sidewall 122, and the outer diameter of the second sidewall 122 is equal to the outer diameter of the third sidewall 132. The first fixing portion 112 and the second fixing portion 113 are formed by extending the first sidewall 111 outward, the third fixing portion 123 is formed by extending the second sidewall 122 inward, and the fourth fixing portion 133 is formed by extending the third sidewall 132 inward. The second housing 120 and the third housing 130 are nested outside the first housing 110.

The rest is the same as the embodiment 1, and the description is omitted.

Example 3

As shown in fig. 10 to 12, unlike embodiment 1, the first casing 110 and the second casing 120 are formed as an integral structure, the diameter of the first sidewall 111 is equal to that of the second sidewall 122, and the diameter of the first sidewall 111 is larger than that of the third sidewall 132.

The rest is the same as the embodiment 1, and the description is omitted.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A can for a steel can battery, comprising:

the first shell (110), the first shell (110) is a cylindrical structure which is surrounded by a first side wall (111) and has a first opening and a second opening, and the first side wall (111) is provided with a first fixing part (112) and a second fixing part (113) at the first opening and the second opening respectively;

the second shell (120), the second shell (120) includes a first bottom wall (121) and a second side wall (122) connected with the edge of the first bottom wall (121) to form a cavity with an opening, and the second side wall (122) is provided with a third fixing part (123);

the second shell (120) comprises a second bottom wall (131) and a third side wall (132) which is connected with the edge of the second bottom wall (131) to form a cavity with an opening, and a fourth fixing part (133) is arranged on the third side wall (132);

wherein the first fixing part (112) is in clamping welding with the third fixing part (123), and the second fixing part (113) is in clamping welding with the fourth fixing part (133).

2. The can of a steel-shelled battery according to claim 1, characterized in that the outer diameter of the first side wall (111) is greater than the outer diameter of the second side wall (122), the outer diameter of the second side wall (122) being equal to the outer diameter of the third side wall (132).

3. The can of a steel-shelled battery according to claim 1, characterized in that the cross-sectional shape of the first fixing portion (112), the second fixing portion (113), the third fixing portion (123) and the fourth fixing portion (133) along the radial direction (X) comprises a combination of one or more of a regular trapezoid, an inverted trapezoid, a cube and a rectangular parallelepiped.

4. The can of claim 3, wherein the first fixing portion (112), the second fixing portion (113), the third fixing portion (123) and the fourth fixing portion (133) have the same cross-sectional shape.

5. The housing of the steel-shelled battery according to claim 1, characterized in that the first fixing part (112) and the second fixing part (113) are formed by extending the first side wall (111), the third fixing part (123) is formed by extending the second side wall (122), and the fourth fixing part (133) is formed by extending the third side wall (132).

6. The housing of a steel-shelled battery according to claim 1, characterized in that the projection of the second shell (120) in the radial direction (X) does not intersect the projection of the third shell (130) in the radial direction (X).

7. The can of a steel-shelled battery according to claim 6, characterized in that the projected height of the second shell (120) in the radial direction (X) is the same as the projected height of the third shell (130) in the radial direction (X).

8. The can of claim 1, wherein the first casing (110) and the second casing (120) are of one-piece construction, the first sidewall (111) has a diameter equal to the second sidewall (122), and the first sidewall (111) has a diameter greater than the third sidewall (132).

9. A steel-shelled battery characterized by comprising an electric core (200) and the casing (100) of any one of claims 1 to 8 for accommodating the electric core (200).

10. The shell of the steel-shell battery as recited in claim 9, wherein the battery core (200) is provided with a tab (210) from one end, and the tab (210) is electrically connected with the shell (100).