CN214099726U

CN214099726U - Button cell

Info

Publication number: CN214099726U
Application number: CN202022179319.9U
Authority: CN
Inventors: 郑文; 李升高; 周燕; 胡大林; 郭玉杰
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-08-31
Anticipated expiration: 2030-09-28

Abstract

The utility model belongs to the technical field of the battery, a button battery is related to, including the soft-packaged electrical core, the soft-packaged electrical core includes utmost point core, first half shell and second half shell, and first half shell and second half shell are soft packaging film structure, and soft packaging film structure includes PP layer, plastic layer and presss from both sides the metal level between PP layer and plastic layer; the inner layer of the first half shell and the inner layer of the second half shell are PP layers, a first flange is formed at the opening end of the first half shell, a second flange is formed at the opening end of the second half shell, and a hot sealing edge is formed between the first flange and the second flange; the heat-sealing edge comprises a first packaging area and a second packaging area; the first packaging area is connected with the side wall of the shell, the second packaging area is connected with the first packaging area, and the second packaging area is a PP layer. Divide into first encapsulated area and second encapsulated area with the heat-seal limit to the second encapsulated area only leaves the PP layer that the heat-seal is together, because PP layer matter ground is soft, can omit book and scald hot banding process, thereby avoid causing the extrusion and lead to the fact the damage to the PP layer that the utmost point core caused.

Description

Button cell

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a button cell.

Background

A button cell is also called a button cell, and refers to a cell with a size similar to a small button, generally having a larger diameter and a thinner thickness. Button cells are widely used in various miniature electronic products due to their small size. In recent years, with the development of science and technology, button batteries are more and more deeply inserted into the lives of people, which puts higher and higher requirements on the safety performance of the button batteries.

At present, soft package button cell using soft package film as a protective shell is needed, but when soft package button cell is manufactured, an embossing mechanism is needed to emboss the hot-sealing edge of the soft package button cell into waves, then the hot-sealing edge is bent into a certain angle through a flanging mechanism, and finally the side wall of the soft package button cell is tightly attached to the hot-sealing edge along the axial direction of the soft package button cell by bending the hot-sealing edge clamp, so that the purpose of forming is achieved.

However, after the hot sealing edge is scalded, the pole core of the soft package button battery is easily greatly extruded due to the wavy hot sealing edge. In addition, the joint of the sealing area and the peripheral wall of the shell of the soft-package button cell has obvious glue squeezing phenomenon, so that corrosion and leakage are easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the button cell is provided aiming at the problem that the existing button cell is easy to corrode and leak.

In order to solve the technical problem, an embodiment of the present invention provides a button battery, which includes a soft package battery cell, wherein the soft package battery cell includes a pole piece, a first half shell and a second half shell, the first half shell and the second half shell are both flexible packaging film structures, and the flexible packaging film structures include a PP layer, a plastic layer and a metal layer sandwiched between the PP layer and the plastic layer;

the inner layer of the first half shell is a PP layer, the open end of the first half shell extends outwards along the radial direction of the first half shell to form an annular first flange, the inner layer of the second half shell is a PP layer, the open end of the second half shell extends outwards along the radial direction of the second half shell to form an annular second flange, and the first flange is in butt joint with the second flange to form a hot edge seal, so that the first half shell and the second half shell form a shell for accommodating the pole core;

the heat-sealing edge comprises an annular first packaging area and an annular second packaging area; the first packaging area is connected with the side wall of the shell, the second packaging area is connected with the first packaging area, and the second packaging area is a PP layer;

the pole core is led out a first pole lug and a second pole lug which are opposite in polarity, and the outer end of the first pole lug and the outer end of the second pole lug pass through the heat-sealing edge and penetrate out of the shell.

Optionally, a minimum distance between an outer edge of the first encapsulation area and a sidewall of the housing is greater than or equal to 0.5 mm.

Optionally, a maximum distance between an outer edge of the first encapsulation area and a sidewall of the housing is less than or equal to 1 mm.

Optionally, the flexible packaging film is an aluminum-plastic composite film, the plastic layer is a nylon layer, and the metal layer is an aluminum foil layer.

Optionally, a section of the first tab located in the shell and a section of the first tab located in the heat-sealed edge are coated with a first tab glue; one section of the second tab located in the shell and one section of the second tab located in the hot sealing edge are coated with second tab glue.

Optionally, button cell still includes electrically conductive stereoplasm epitheca and electrically conductive stereoplasm inferior valve, the open end of stereoplasm epitheca with the open end of stereoplasm inferior valve is insulating to be connected so that the stereoplasm epitheca with the stereoplasm inferior valve is constituteed and is used for holding laminate polymer core's protective housing, first utmost point ear with the stereoplasm epitheca is electrically conductively connected, the second utmost point ear with the stereoplasm epitheca is electrically conductively connected.

Optionally, a first notch and a second notch are formed in the side wall of the hard upper shell, the first notch is used for avoiding the first tab, and the second notch is used for avoiding the second tab.

Optionally, the first tab is welded to the inner side of the top wall of the hard upper shell, and the second tab is welded to the inner side of the bottom wall of the hard lower shell.

Optionally, the rigid upper shell and the rigid lower shell are both steel shells.

Optionally, the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, the first pole piece and the second pole piece have opposite polarities, the first pole tab is led out from the first pole piece, and the second pole tab is led out from the second pole piece.

Compared with the prior art, the button cell provided by the embodiment of the utility model, through the PP layer of regarding the flexible packaging film as the inlayer of first half shell and the inlayer of second half shell, and with the open end of first half shell along the radial outward extension of first half shell and form annular first flange, with the open end of second half shell along the radial outward extension of second half shell and form annular second flange, make first flange and second flange carry out heat-seal connection through the PP layer thereby banding heat, divide the heat-seal limit into annular first encapsulated area and annular second encapsulated area, first encapsulated area links to each other with the lateral wall of casing, the second encapsulated area links to each other with first encapsulated area, and get rid of the plastic layer and the metal level of second encapsulated area, make second encapsulated area (the region of the outer lane of hot banding region) only leave the PP layer together of heat-seal, because the PP layer is soft qualitatively, the process of folding and scalding the hot edge sealing can be omitted, so that the problem that the pole core is extruded to be damaged and the PP layer is damaged due to folding and scalding of the hot edge sealing is avoided, and the button cell is not prone to corrosion and leakage.

Drawings

Fig. 1 is a schematic structural diagram of a flexible package battery cell provided in an embodiment of the present invention;

fig. 2 is an exploded view of the soft-packed cell shown in fig. 1;

fig. 3 is a cross-sectional view of a heat seal edge of the flexible pouch cell shown in fig. 1;

fig. 4 is a schematic structural diagram of a hard upper case of a button battery according to an embodiment of the present invention;

fig. 5 is an exploded view of a button cell according to an embodiment of the present invention.

The reference numerals in the specification are as follows:

1. soft-packaged battery cells;

11. a pole piece; 111. a first tab; 112. a second tab;

12. a first half shell; 121. a first flange; 13. a second half shell; 131. a second flange;

21. a PP layer; 22. a plastic layer; 23. a metal layer;

14. performing hot edge sealing; 141. a first package region; 142. a second package region;

3. a hard upper shell; 31. a first notch; 32. a second notch;

4. a hard lower shell.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "upper", "lower", and the like, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 1-3, an embodiment of the present invention provides a button battery, which includes a soft-package battery cell 1, where the soft-package battery cell 1 includes a pole piece 11, a first half shell 12 and a second half shell 13, the first half shell 12 and the second half shell 13 are both soft-package film structures, and each soft-package film structure includes a PP layer 21, a plastic layer 22, and a metal layer 23 sandwiched between the PP layer 21 and the plastic layer 22;

the inner layer (the inner layer refers to the layer of the first half shell as the inner wall) of the first half shell 12 is a PP layer 21, the open end of the first half shell 12 extends outwards along the radial direction of the first half shell 12 to form an annular first flange 121, the inner layer (the inner layer refers to the layer of the second half shell as the inner wall) of the second half shell 13 is a PP layer 21, the open end of the second half shell 13 extends outwards along the radial direction of the second half shell 13 to form an annular second flange 131, and the first flange 121 and the second flange 131 are butted to form a hot edge seal 14, so that the first half shell 12 and the second half shell 13 form a shell for accommodating the pole core 11;

heat seal edge 14 comprises an annular first encapsulated area 141 and an annular second encapsulated area 142; the first packaging region 141 is connected with the side wall of the shell, the second packaging region 142 is connected with the first packaging region 141, and the second packaging region 142 is a PP layer 21;

the pole core 11 leads out a first pole lug 111 and a second pole lug 112 with opposite polarities, and the outer end of the first pole lug 111 and the outer end of the second pole lug 112 penetrate out of the shell through the heat sealing edge 14.

Compared with the prior art, the button cell provided by the embodiment of the invention has the advantages that the PP layer 21 of the flexible packaging film is used as the inner layer of the first half-shell 12 and the inner layer of the second half-shell 13, the open end of the first half-shell 12 extends radially outwards to form the annular first flange 121, the open end of the second half-shell 13 extends radially outwards to form the annular second flange 131, so that the first flange 121 and the second flange 131 can be heat-sealed and connected through the PP layer 21 to form the thermal edge seal 14, the thermal edge seal 14 is divided into the annular first packaging area 141 and the annular second packaging area 142, the first packaging area 141 is connected with the side wall of the shell, the second packaging area 142 is connected with the first packaging area 141, the plastic layer 22 and the metal layer 23 of the second packaging area 142 are removed, and the second packaging area 142 (i.e. the area of the outer ring of the thermal edge seal 14) only remains the PP layer 21 which is heat-sealed together, because the PP layer 21 is soft in texture, the process of folding and scalding the hot edge sealing 14 can be omitted, so that the problems that the pole core 11 is extruded and damaged and the PP layer 21 is damaged due to folding and scalding the hot edge sealing 14 are solved, and the button cell is not easy to corrode and leak liquid.

The steps of manufacturing the first half shell 12 and the second half shell 13 may be obtaining the first half shell 12 with the first flange 121 and the second half shell 13 with the second flange 131 which are formed by soft packaging film stamping; wherein the first half-shell 12, which may be stamped, has a first pole core pit for accommodating the pole core, and the second half-shell 13 does not have a pole core pit for accommodating the pole core, the entire pole core being accommodated in the first pole core pit; the first half shell 12 may be formed by stamping and has a first pole core pit, the second half shell 13 may be formed by stamping and has a second pole core pit, and after the first half shell 12 and the second half shell 13 are butted, the first pole core pit and the second pole core pit form a containing cavity for containing a pole core, and the pole core is contained in the containing cavity.

Wherein, the depth of first pole core hole and second pole core hole can be the same also can be different, the utility model discloses do not do the restriction here.

The first half shell 12 and the second half shell 13 can be formed on the same flexible packaging film, when the first half shell 12 and the second half shell 13 are to form a shell for accommodating the pole piece 11, the first half shell 12 and the second half shell 13 can be butted only by folding along a symmetrical line between the first half shell 12 and the second half shell 13, and then the first half shell 12 and the second half shell 13 are subjected to heat sealing by a heat sealing machine; in the alternative, the first and second sets of the first and second sets of the first and second sets of the first and second sets of the first and second sets of the first and second sets of the second,

the first half-shell 12 and the second half-shell 13 can be formed on different flexible packaging films (i.e., independently from each other), and when the first half-shell 12 and the second half-shell 13 are to be formed into a housing accommodating the pole piece 11, the independently from each other are butted and heat-sealed by a heat sealing machine.

In an embodiment, the minimum distance between the outer edge of the first encapsulation area 141 and the side wall of the housing is greater than or equal to 0.5mm, so that the first encapsulation area 141 can guarantee the effectiveness of the encapsulation.

In an embodiment, the maximum distance between the outer edge of the first encapsulation area 141 and the side wall of the housing is less than or equal to 1mm, so that the encapsulation effectiveness of the first encapsulation area 141 is ensured, and meanwhile, the first encapsulation area 141 does not need to be folded and ironed due to the overlarge area of the first encapsulation area 141, thereby effectively avoiding the problem that the pole piece 11 is extruded and damaged due to folding and ironing of the first encapsulation area 141 and the PP layer 21 is damaged.

In one embodiment, the flexible packaging film is an aluminum-plastic composite film, the plastic layer 22 is a nylon layer, and the metal layer 23 is an aluminum foil layer. The compression resistance, the heat sealing performance and the sealing performance of the aluminum-plastic composite film are good, the battery leakage in the soft package battery can be effectively prevented, and the service life of the soft package battery is prolonged.

In one embodiment, the section of the first tab 111 inside the casing and the section of the heat seal edge 14 are coated with a first tab glue (not shown); the section of the second tab 112 located in the casing and the section located in the heat seal edge 14 are coated with a second tab glue (not shown). The first tab glue and the second tab glue are arranged, so that the first tab 111 and the second tab 112 cannot directly contact with the heat sealing edge 14 at the heat sealing edge 14, and the first tab 111 and the second tab 112 are prevented from reacting with the heat sealing edge 14 to corrode the heat sealing edge 14.

In an embodiment, as shown in fig. 5, the button cell further includes an electrically conductive hard upper case 3 and an electrically conductive hard lower case 4, an open end of the hard upper case 3 is in insulated connection with an open end of the hard lower case 4, so that the hard upper case 3 and the hard lower case 4 form a protective case for accommodating the flexible package battery cell 1, the first tab 111 is electrically connected with the hard upper case 3, and the second tab 112 is electrically connected with the hard upper case 3. Through holding laminate polymer core 1 in the protective housing that stereoplasm epitheca 3 and stereoplasm inferior valve 4 are constituteed, can prevent moisture and laminate polymer core 1 contact to button cell has been strengthened to resist the ability of external force extrusion and anticollision, has guaranteed button cell's encapsulation security. Wherein, stereoplasm epitheca 3 and stereoplasm inferior valve 4 can set up the insulating layer in order to realize insulating connection between them in the junction, and of course it also can adopt other modes to realize insulating connection, the utility model discloses do not do the restriction here.

In an embodiment, as shown in fig. 4, a first notch 31 and a second notch 32 are formed on a side wall of the hard upper shell 3, the first notch 31 is used for avoiding the first tab 111, and the second notch 32 is used for avoiding the second tab 112. So as to facilitate the conductive connection of the first tab 111 to the hard upper shell 3 and the conductive connection of the second tab 112 to the hard upper shell 3.

In one embodiment, the first tab 111 is welded to the inner side of the top wall of the hard upper case 3, and the second tab 112 is welded to the inner side of the bottom wall of the hard lower case 4, so as to achieve the conductive connection between the first tab 111 and the hard upper case 3, and the conductive connection between the second tab 112 and the hard upper case 3.

Preferably, a first insulating layer is attached to a portion of the first tab 111 other than the welding point, and a second insulating layer is attached to a portion of the second tab 112 other than the welding point, so as to prevent short circuit of the pouch cell 1.

Further, two outer end faces of the soft package battery cell 1 in the axial direction are respectively provided with a protective layer, so that the first tab 111 and the second tab 112 are not in direct contact with the shell formed by the first half shell 12 and the second half shell 13, and the short circuit of the soft package battery cell 1 is more effectively prevented.

In one embodiment, the rigid upper shell 3 and the rigid lower shell 4 are both steel shells. The soft package battery cell 1 can be effectively protected. And the steel shell structure can make the button cell have better appearance size consistency.

The hard upper shell 3 and the hard lower shell 4 can be preferably combined by a U-shaped shell and a steel cover, or combined by an upper steel shell half shell and a lower steel shell half shell.

In one embodiment, the pole core 11 is formed by winding a first pole piece, a diaphragm and a second pole piece, wherein the polarities of the first pole piece and the second pole piece are opposite, a first pole tab 111 is led out of the first pole piece, and a second pole tab 112 is led out of the second pole piece. The space of the shell formed by the first half shell 12 and the second half shell 13 can be fully utilized, and the energy density of the soft package battery core 1 is improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The button battery is characterized by comprising a soft package battery core, wherein the soft package battery core comprises a pole core, a first half shell and a second half shell, the first half shell and the second half shell are of a soft package film structure, and the soft package film structure comprises a PP layer, a plastic layer and a metal layer clamped between the PP layer and the plastic layer;

2. The button cell according to claim 1, wherein a minimum distance between an outer edge of the first encapsulation area and a side wall of the housing is greater than or equal to 0.5 mm.

3. The button cell according to claim 2, wherein the maximum distance between the outer edge of the first encapsulation area and the side wall of the housing is less than or equal to 1 mm.

4. The button cell of claim 1, wherein the flexible packaging film is an aluminum-plastic composite film, the plastic layer is a nylon layer, and the metal layer is an aluminum foil layer.

5. The button cell according to claim 1, wherein a section of the first tab inside the housing and a section of the first tab inside the heat seal edge are coated with a first tab glue; one section of the second tab located in the shell and one section of the second tab located in the hot sealing edge are coated with second tab glue.

6. The button battery according to claim 1, further comprising a hard conductive upper shell and a hard conductive lower shell, wherein the open end of the upper hard shell is connected with the open end of the lower hard shell in an insulating manner, so that the upper hard shell and the lower hard shell form a protective shell for accommodating the pouch cell, the first tab is electrically connected with the upper hard shell, and the second tab is electrically connected with the upper hard shell.

7. The button cell according to claim 6, wherein a first notch and a second notch are formed in a side wall of the hard upper case, the first notch is used for avoiding the first tab, and the second notch is used for avoiding the second tab.

8. The button cell as defined in claim 7, wherein the first tab is welded to the inside of the top wall of the hard upper case and the second tab is welded to the inside of the bottom wall of the hard lower case.

9. The button cell according to claim 6, wherein the hard upper case and the hard lower case are both steel cases.

10. The button cell according to claim 1, wherein the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, the first pole piece and the second pole piece have opposite polarities, the first pole piece is provided with the first tab, and the second pole piece is provided with the second tab.