CN217158365U

CN217158365U - Button cell and shell thereof

Info

Publication number: CN217158365U
Application number: CN202122755281.XU
Authority: CN
Inventors: 曹琳; 王传宝; 陈杰; 项海标
Original assignee: Dongguan Lithium Microelectronics Technology Co ltd
Current assignee: Dongguan Lithium Microelectronics Technology Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-08-09
Anticipated expiration: 2031-11-11

Abstract

The utility model discloses a button cell's shell, include: the first shell assembly comprises a cover plate, the cover plate comprises a body part and a side part, and the edge of the body part is connected with the side part; the second shell comprises a bottom wall and a side wall formed by upward extending of the bottom wall, the axial projection of the body part covers the bottom wall, and the radial projection of the side part is intersected with the radial projection of the side wall; the connecting body is arranged between the contact surfaces of the cover plate and the second shell and used for bonding the cover plate and the second shell. This application sets up the connector in the junction of first casing subassembly and second casing, and the colloid solidification through the connector makes first casing subassembly and second casing can sealing connection, when having avoided adopting mechanical seal and laser seal, because of the unstable laser of sealing washer atress produces the battery weeping that the thermal radiation effect leads to easily and the battery diaphragm is heated the problem that the inefficacy makes battery electrical property descend.

Description

Button cell and shell thereof

Technical Field

The utility model relates to a lithium ion battery makes the field, concretely relates to button cell and shell thereof.

Background

There is an increasing demand for intelligent wearable devices, such as headsets, earphones, smartwatches, and body worn medical devices, and for rechargeable batteries with relatively high energy density and ultra-compact size. An ultra-compact rechargeable battery should have a reliable electric capacity within a limited size, implement an efficient structure while reducing weight, and have sufficient structural stability and low cost. In conventional steel can button cells, the case seal is sealed using a mechanical seal or a laser weld seal. The sealing batch production has the following pain points: 1) when mechanical sealing is adopted, liquid leakage is easily caused due to unstable stress of the sealing ring, so that the safety of the battery is reduced; 2) when laser sealing is adopted, a thermal radiation effect is easily generated, so that a battery diaphragm is heated to lose efficacy, the electrical property of the battery is reduced, and the input cost of laser sealing equipment is high.

SUMMERY OF THE UTILITY MODEL

In view of the problem that exists among the background art, the utility model aims to provide a button cell and shell thereof sets up the connector in the junction of first casing subassembly and second casing, and the colloid solidification through the connector makes first casing subassembly and second casing can sealing connection, when having avoided adopting mechanical seal and laser seal, because of the unstable laser of sealing washer atress produces the battery weeping that the thermal radiation effect leads to easily and the battery diaphragm is heated the inefficacy problem that makes battery electrical property descend.

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

in a first aspect, the utility model provides a button cell's shell, include:

the first shell assembly comprises a cover plate, the cover plate comprises a body part and a side part, and the edge of the body part is fixedly connected with the side part;

the second shell comprises a bottom wall and a side wall formed by extending the bottom wall upwards, the projection of the body part along the axial direction covers the bottom wall, and the projection of the side part along the radial direction is intersected with the projection of the side wall along the radial direction;

and the connecting body is arranged between the cover plate and the contact surface of the second shell and used for bonding the cover plate and the second shell.

Specifically, a convex part is arranged on the opening end face of the side wall at the opening, and the convex part and the opening end face form a step structure.

Specifically, the radial projection of the side part completely coincides with the radial projection of the convex part, and a connecting body is arranged between the side part and the convex part.

Specifically, the first housing assembly further comprises a conductive body and an insulating member, the body portion is provided with a first through hole, at least part of the conductive body covers the first through hole along the axial projection, the insulating member is used for isolating and fixedly connecting the conductive body and the body portion, and the insulating member is provided with a second through hole.

Specifically, at least part of the radial projection of the electric conductor intersects with the radial projection of the cover plate.

Specifically, the conductor comprises a column part and an extension part, and the extension part extends annularly along the end face of the column part.

Specifically, the pillar portion is disposed through the through hole, the extension portion is disposed on one side of the body portion, and an insulating member is disposed between the extension portion and the body portion.

Specifically, the first shell assembly further comprises a reinforcing plate, the reinforcing plate is arranged on one side of the insulating part and fixedly connected with the insulating part, the reinforcing plate is provided with a third through hole, the column part penetrates through the second through hole and the third through hole, and the extension part penetrates through the first through hole.

The diameter of the third through hole is larger than that of the second through hole, the diameter of the second through hole is smaller than that of the first through hole, and the diameter of the third through hole is smaller than that of the first through hole.

In a second aspect, the present invention provides a button cell battery, which comprises an electrode assembly and a housing for accommodating the electrode assembly.

The beneficial effects of the utility model are as follows: the sealing ring is extruded to carry out mechanical sealing relative to the first shell assembly and the second shell, and the first shell assembly and the second shell are connected through the connector for colloid curing, so that the problems that the sealing ring is unstable in stress, liquid leakage is easily caused, and the safety of a battery is reduced are solved; carry out laser sealing for first casing subassembly and second casing laser welding, this application adopts the connector to carry out the colloid solidification through the junction at first casing subassembly and second casing and is connected, and the connector can not produce heat radiation at the curing process, consequently can avoid the heat radiation that laser produced to make battery diaphragm be heated inefficacy, leads to battery electrical property to descend. This scheme can replace mechanical seal and laser seal to carry out sealing connection to the shell, possesses the high sealing characteristic of battery simultaneously. In addition, the method and the device do not need to input high cost, and compared with the laser welding, the method and the device have the advantages that the cost is high, the equipment input is high, and the equipment investment is saved.

Drawings

Fig. 1 is one of cross-sectional views of a button cell according to an embodiment of the present invention;

fig. 2 is a second cross-sectional view of a button cell according to an embodiment of the present invention;

fig. 3 is a third cross-sectional view of a button cell according to an embodiment of the present invention;

fig. 4 is one of the cross-sectional views of the case of the button cell battery according to an embodiment of the present invention;

fig. 5 is a second cross-sectional view of the housing of the button cell battery according to an embodiment of the present invention;

fig. 6 is a third cross-sectional view of the housing of the button cell battery according to an embodiment of the present invention;

fig. 7 is a fourth cross-sectional view of the housing of the button cell battery according to an embodiment of the present invention.

The labels in the figure are: 100-a housing; 110-a first housing component; 111-a cover plate; 112-a body portion; 113-a side; 114-an electrical conductor; 115-an insulator; 116-a pillar portion; 117-an extension; 118-a stiffener; 120-a second housing; 121-bottom wall; 122-a side wall; 123-open end face; 124-convex part; 130-a linker; 200-an electrode assembly; 210-positive plate; 220-negative pole piece; 230-a membrane; 240-positive tab; 250-negative tab; y-axis direction; x-radial 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 figures above, 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 foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

The following embodiments are described in detail with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the present embodiment provides a button cell battery including an electrode assembly 200 and a case 100 accommodating the electrode assembly 200.

The electrode assembly 200 includes a positive electrode tab 210, a negative electrode tab 220, and a separator 230, the separator 230 being disposed between the positive electrode tab 210 and the negative electrode tab 220. The positive electrode sheet 210, the negative electrode sheet 220 and the separator 230 are wound into a cylindrical winding core through a winding process, and the positive electrode tab 240 and the negative electrode tab 250 are respectively led out from the upper end face and the lower end face of the winding core. It is understood that there may be a plurality of positive electrode tabs 240 and negative electrode tabs 250.

The positive tab 240 is an aluminum tape, the negative tab 250 is a copper nickel-plated tape, a copper tape or a nickel tape, and in this embodiment, the negative tab 250 uses a copper nickel-plated tape. And respectively welding the aluminum strip and the copper nickel plating strip on the empty foils of the positive plate 210 and the negative plate 220 by adopting ultrasonic welding. The non-welding points of the aluminum strip and the copper nickel plating strip are subjected to insulation treatment in a mode of thermal compounding of PP glue, pasting of insulating gummed paper or coating of insulating glue, and short circuit caused by the fact that the aluminum strip contacts the shell 100 connected with the copper nickel plating strip can be avoided through the insulation treatment, or the copper nickel plating strip contacts the positive plate 210 and short circuit is avoided. It is understood that the positive tab 240 and the negative tab 250 can also be cut from the empty foil of the positive tab 210 and the negative tab 220, respectively.

The housing 100 includes a first housing assembly 110, a second housing 120, and a connecting body 130. The first housing assembly 110 includes a cover plate 111, the cover plate 111 includes a body 112 and a side 113, and an edge of the body 112 is fixedly connected to the side 113; a second housing 120, including a bottom wall 121 and a side wall 122 formed by extending the bottom wall 121 upwards, a projection of the body 112 along the axial direction Y is larger than a projection of the bottom wall 121 along the axial direction Y, that is, the cover plate 111 covers an opening of the second housing 120, and a projection of the side portion 113 along the radial direction X completely intersects with a projection of the side wall 122 along the radial direction X, that is, the second housing 120 is nested in an open cavity of the cover plate 111; the first case assembly 110 and the second case 120 are combined to form a cavity for accommodating the electrode assembly 200, the connecting body 130 is disposed between the contact surfaces of the side portion 113 and the side wall 122 for bonding the first case assembly 110 and the second case 120, and is specifically operated to spray curing glue on the side wall 122 and the bottom wall 121 of the second case 120, spray delay curing glue for the second time after curing, and coat the delay curing glue on the side portion 113 and the body portion 112 of the cover plate 111, and the cover plate 111 surrounds the second case 120, so that the cover plate 111 is in insulation fit with the second case 120. The cover plate 111 and the second housing 120 are made of one of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, stainless steel and magnesium aluminum alloy. In the present embodiment, the material of the cover plate 111 and the second housing 120 is preferably stainless steel, the cover plate 111 is obtained by sheet metal or integral punching of a stainless steel sheet, and the second housing 120 is obtained by integral punching of a stainless steel sheet.

The positive electrode tab 240 is welded to the body portion 112 of the cap plate 111 by ultrasonic welding, resistance welding, or laser welding, and the negative electrode tab 250 is welded to the bottom wall 121 of the second case 120 by resistance welding or laser welding.

The sealing rings are extruded to carry out mechanical sealing relative to the first shell assembly 110 and the second shell 120, the first shell assembly 110 and the second shell 120 are connected through the connecting body 130 for colloid solidification, and the problems that the sealing rings are unstable in stress, liquid leakage is easily caused, and the safety of a battery is reduced are solved; for first casing subassembly 110 and second casing 120 laser welding carry out laser sealing, this application is connected through adopting connecting body 130 to carry out the colloid solidification in the junction of first casing subassembly 110 and second casing 120, and connecting body 130 can not produce heat radiation in the curing process, consequently can avoid the heat radiation that laser produced to make the diaphragm 230 of battery be heated inefficacy, leads to battery electrical property to descend. The scheme can replace mechanical sealing and laser sealing to carry out sealing connection on the shell 100 and has the high sealing characteristic of the battery. In addition, the method and the device do not need to input high cost, and compared with the laser welding, the method and the device have the advantages that the cost is high, the equipment input is high, and the equipment investment is saved.

Example 2

As shown in fig. 2, unlike embodiment 1, the first housing assembly 110 of this embodiment further includes a conductive body 114 and an insulating member 115, the body 112 is provided with a first through hole, a projection of at least a portion of the conductive body 114 along the axial direction Y covers the first through hole, and the insulating member 115 is provided with a second through hole for fixedly connecting the conductive body 114 and the body 112. The diameter of the second through hole is smaller than that of the first through hole, the conductive body 114 is made of one of aluminum, nickel or stainless steel, and the connecting body 130 may be an insulating adhesive or an insulating adhesive doped with conductive particles.

In this embodiment, positive tab 240 is welded to conductor 114 by ultrasonic, resistance, or laser welding. Electrode assembly 200 is welded to electrical conductor 114 and is in electrical communication with an external circuit via electrical conductor 114. When the connection member 130 is an insulating paste doped with conductive particles, a thin insulating layer is sprayed on a surface of the cover plate 111 facing the electrode assembly 200 by a plastic spraying method, so as to prevent the insulating layer of the positive tab 240 from being damaged and contacting the stainless steel on the cover plate 111 to cause short circuit.

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

Example 3

As shown in fig. 3, on the basis of embodiment 2, the projection of at least part of the conductive body 114 in the radial direction X intersects the projection of the cover plate 111 in the radial direction X.

The rest is the same as embodiment 2, and is not described again.

Example 4

As shown in fig. 4 to 5, in embodiment 2, the conductive body 114 of the present embodiment includes a pillar portion 116 and an extension portion 117, and the extension portion 117 extends annularly along an end surface of the pillar portion 116. As shown in fig. 4, one of the two arrangements is that the post 116 is inserted into the first through hole, the extension 117 is disposed at one side of the body 112, and the insulating member 115 is disposed between the extension 117 and the body 112; as shown in fig. 5, the other is that the extension portion 117 is disposed through the first through hole with a gap, the post portion 116 is disposed through the second through hole, and the cover plate 111 and the conductor 114 are connected to the same side of the insulating member 115.

The rest is the same as embodiment 2, and is not described again.

Example 5

As shown in fig. 6, on the basis of embodiment 4, the first housing assembly 110 of this embodiment further includes a reinforcing plate 118, the reinforcing plate 118 is provided with a third through hole, the reinforcing plate 118 is disposed on one side of the cover plate 111, and the reinforcing plate 118 is thermally pressed and combined with the cover plate 111 through the insulating member 115. The pillar 116 is disposed through the second through hole and the third through hole and has a gap with the third through hole, and the extension 117 is disposed through the first through hole and has a gap with the first through hole. The diameter of the third through hole is larger than that of the second through hole and smaller than that of the first through hole. In the embodiment, the reinforcing plate 118 is additionally arranged on the insulating member 115, so that the problem of insufficient structural strength of a composite structure formed by the cover plate 111 and the conductor 114 is solved, the sealing performance between the shell 100 and the conductor 114 is enhanced, and the energy density of the battery is effectively improved.

The rest is the same as embodiment 4, and is not described again.

Example 6

As shown in fig. 7, on the basis of embodiment 5, the shadow area of the cover plate 111 in the axial direction Y of the present embodiment is smaller than the shadow area of the second housing 120 in the axial direction Y, the opening end face 123 of the second housing 120 at the opening is provided with a convex portion 124, the convex portion 124 and the opening end face 123 form a step structure, and the side portion 113 of the cover plate 111 and the convex portion 124 of the second housing 120 are matched with each other. In the present embodiment, the protruding portion 124 of the second housing 120 and the opening end face 123 form a step structure, so that the cover plate 111 can be well positioned without increasing the volume of the battery in the radial direction X.

The rest is the same as embodiment 5, 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 various modifications and changes may be made by those skilled in the art. 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 housing for a button cell battery, comprising:

the first shell assembly (110) comprises a cover plate (111), the cover plate (111) comprises a body part (112) and a side part (113), and the edge of the body part (112) is fixedly connected with the side part (113);

a second housing (120) including a bottom wall (121) and a side wall (122) formed by extending the bottom wall (121) upwards, wherein a projection of the body portion (112) along the axial direction (Y) covers the bottom wall (121), and a projection of the side portion (113) along the radial direction (X) intersects with a projection of the side wall (122) along the radial direction (X);

and the connecting body (130) is arranged between the contact surfaces of the cover plate (111) and the second shell (120) and used for bonding the cover plate (111) and the second shell (120).

2. The button cell casing according to claim 1, characterized in that the opening end face (123) of the side wall (122) at the opening is provided with a convex part (124), and the convex part (124) and the opening end face (123) form a step structure.

3. Button cell casing according to claim 2, characterised in that the projection of the side (113) in the radial direction (X) coincides completely with the projection of the protrusion (124) in the radial direction (X), a connection (130) being provided between the side (113) and the protrusion (124).

4. The casing of a button cell according to claim 1, characterized in that the first housing assembly (110) further comprises a conductive body (114) and an insulating member (115), the body portion (112) is provided with a first through hole, at least a part of the conductive body (114) is projected in the axial direction (Y) to cover the first through hole, the insulating member (115) is used for fixedly connecting the conductive body (114) and the body portion (112), and the insulating member (115) is provided with a second through hole.

5. Button cell casing according to claim 4, characterised in that at least part of the conductor (114) intersects the cover plate (111) in a projection along the radial direction (X).

6. Button cell casing according to claim 5, characterized in that the electrical conductor (114) comprises a post (116) and an extension (117), the extension (117) extending annularly along the end face of the post (116).

7. The casing of the button cell battery as recited in claim 6, wherein the post (116) is disposed through the first through hole, the extension (117) is disposed at one side of the body (112), and an insulator (115) is disposed between the extension (117) and the body (112).

8. The casing of the button cell battery as defined in claim 6, wherein the first casing assembly (110) further comprises a reinforcing plate (118), the reinforcing plate (118) is disposed at one side of the insulator (115) and is fixedly connected to the insulator (115), the reinforcing plate (118) is provided with a third through hole, the post (116) is disposed through the second and third through holes, and the extension portion (117) is disposed through the first through hole.

9. The button cell casing according to claim 8, wherein the diameter of the third through hole is larger than the diameter of the second through hole, the diameter of the second through hole is smaller than the diameter of the first through hole, and the diameter of the third through hole is smaller than the diameter of the first through hole.

10. A button cell battery, characterized by comprising an electrode assembly (200) and a casing (100) according to any one of claims 1 to 9 for housing said electrode assembly (200).