CN212380475U

CN212380475U - Button cell

Info

Publication number: CN212380475U
Application number: CN202021425144.9U
Authority: CN
Inventors: 金振东; 张淼; 孙赵勇; 李康生
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-01-19
Anticipated expiration: 2030-07-17

Abstract

The utility model relates to a button cell, which comprises a shell and a pole core, wherein the pole core is accommodated in a cavity of the shell and comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, a positive tab is led out from the positive plate, and a negative tab is led out from the negative plate; the casing includes stereoplasm upper cover and soft lower cover, stereoplasm upper cover and soft lower cover sealing connection, and the outer end of anodal ear and the outer end of negative pole ear are worn out from the junction of stereoplasm upper cover and soft lower cover. Compared with the prior art, the hard upper cover and the soft lower cover are combined, the hard upper cover is not easy to deform, the strength of the button battery is improved, the appearance defects generated in the production process are effectively reduced, and the yield of the button battery is improved; in addition, the hard upper cover can be leaked out of the mounting groove during mounting, so that convenience in mounting the button battery at the terminal is greatly facilitated; meanwhile, the soft lower cover provides a buffer space for the heating expansion of the pole core, so that explosion is avoided, and the safety of the button battery is ensured.

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. In particular, soft-pack button cells have the advantages of good safety (unlike hard-case button cells which explode), light weight, and the like, and thus are widely used in various miniature electronic products.

In the production process of the existing soft package button battery, an aluminum-plastic composite film is mainly used as a shell of a pole core, but the aluminum-plastic composite film is easy to deform in the production process due to soft texture, so that the appearance is poor; moreover, when the soft package button battery is installed, the soft package button battery is easy to deform under stress, so that inconvenience in assembly is caused, and the electric connection quality of the soft package button battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: to the problem that current laminate polymer button cell warp easily, provide a button cell.

In order to solve the technical problem, an embodiment of the present invention provides a button battery, which includes a housing and a pole core, wherein the pole core is accommodated in a cavity of the housing, the pole core includes a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, a positive tab is led out from the positive plate, and a negative tab is led out from the negative plate;

the casing includes stereoplasm upper cover and soft lower cover, the stereoplasm upper cover with soft lower cover sealing connection, the outer end of positive pole ear with the outer end of negative pole ear is followed the stereoplasm upper cover with the junction of soft lower cover is worn out.

Optionally, the hard upper cover is made of a steel-plastic composite film, and the soft lower cover is made of an aluminum-plastic composite film.

Optionally, the steel-plastic composite film comprises a steel foil layer and a PP layer, and the aluminum-plastic composite film comprises the PP layer, a nylon layer and an aluminum foil layer sandwiched between the PP layer and the nylon layer; the hard upper cover and the soft lower cover are connected into a whole through a PP layer of the hard upper cover and a PP layer of the soft lower cover through a heat sealing process.

Optionally, the rigid upper cover comprises a first cylindrical structure with a downward opening and a first annular flange arranged at the opening of the first cylindrical structure; the soft lower cover is of a plane sheet structure; the soft lower cover is connected with the first annular flange in a sealing mode to seal the opening of the first cylindrical structure.

Optionally, the rigid upper cover comprises a first cylindrical structure with a downward opening and a first annular flange arranged at the opening of the first cylindrical structure; the soft lower cover comprises a second cylindrical structure with an upward opening and a second annular flange arranged at the opening of the second cylindrical structure;

the first annular flange and the second annular flange are butted to form the cavity on the inner sides of the hard upper cover and the soft lower cover; the positive electrode tab and the negative electrode tab penetrate out of the butt joint gap of the first annular flange and the second annular flange.

Optionally, the first cylindrical structure has a greater barrel depth than the second cylindrical structure.

Optionally, a first sealant is arranged at the joint of the positive tab and the positive plate, and a second sealant is arranged at the joint of the negative tab and the negative plate.

Optionally, the positive tab be located in not being provided with in the cavity one section of first sealed glue and being located first annular flange with one section cladding in the butt joint gap of second annular flange has first utmost point ear to glue, being located of negative pole ear not being provided with in the cavity one section of sealed glue of second and being located first annular flange with one section cladding in the butt joint gap of second annular flange has second utmost point ear to glue.

Optionally, the first cylindrical structure comprises a first circular bottom and a first annular part connecting the first circular bottom and the first annular flange, and the first annular part extends in a direction perpendicular to the first circular bottom;

the second tubular structure includes the circular bottom of second and connects the circular bottom of second with the annular portion of second annular flange, the extending direction of the annular portion of second with the contained angle of the circular bottom of second is the obtuse angle.

Optionally, the first annular portion is in smooth transition with the first rounded bottom portion;

the second annular portion is in smooth transition with the second rounded bottom portion.

Compared with the prior art, the button cell provided by the embodiment of the utility model adopts the combination of the hard upper cover and the soft lower cover, the hard upper cover is not easy to deform, the strength of the button cell is improved, the appearance defects generated in the production process are effectively reduced, and the yield of the button cell is improved; in addition, the hard upper cover can be leaked out of the mounting groove during mounting, so that convenience in mounting the button battery at the terminal is greatly facilitated; meanwhile, the soft lower cover provides a buffer space for the heating expansion of the pole core, so that explosion is avoided, and the safety of the button battery is ensured.

Drawings

Fig. 1 is a schematic structural view of a button cell according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is a schematic structural view of a button cell according to another embodiment of the present invention.

The reference numerals in the specification are as follows:

1. a housing; 11. a cavity;

12. a hard upper cover; 121. a first annular flange;

122. a first cylindrical structure; 1221. a first circular bottom; 1222. a first annular portion;

13. a soft lower cover; 131. a second annular flange;

132. a second cylindrical structure; 1321. a second circular bottom; 1322. a second annular portion;

2. a pole piece; 21. a positive plate; 22. a first diaphragm; 23. a negative plate; 24. a second diaphragm;

3. a positive tab; 4. a negative tab; 5. a first sealant; 6. a second sealant; 7. first tab glue;

8. and a second ear glue.

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 is to be understood that the terms "upper", "lower", and the like, as used herein, are used in an orientation or positional relationship shown in the drawings for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

As shown in fig. 1 and fig. 2, a button battery provided in an embodiment of the present invention includes a casing 1 and a pole piece 2, the pole piece 2 is accommodated in a cavity 11 of the casing 1, the pole piece 2 includes a positive plate 21, a negative plate 23, and a diaphragm disposed between the positive plate 21 and the negative plate 23, the positive plate 21 has a positive tab 3 led out, and the negative plate 23 has a negative tab 4 led out;

the casing 1 comprises a hard upper cover 12 and a soft lower cover 13, the hard upper cover 12 is hermetically connected with the soft lower cover 13, and the outer end of the positive electrode tab 3 and the outer end of the negative electrode tab 4 penetrate out from the connection part of the hard upper cover 12 and the soft lower cover 13.

Compared with the prior art, the button cell provided by the embodiment of the utility model adopts the combination of the hard upper cover 12 and the soft lower cover 13, the hard upper cover 12 is not easy to deform, the strength of the button cell is improved, the appearance defects generated in the production process are effectively reduced, and the yield of the button cell is improved; in addition, the hard upper cover 12 can be leaked out of the mounting groove during mounting, so that convenience in mounting the button cell on a terminal is greatly facilitated; meanwhile, the soft lower cover 13 provides a buffer space for the heating expansion of the pole core 2, so that the explosion is avoided, and the safety of the button battery is ensured.

Specifically, as shown in fig. 2, the separator includes a first separator 22 and a second separator 24, the first separator 22 is disposed between the positive electrode tab 21 and the negative electrode tab 23, the second separator 24 is disposed on the surface of the negative electrode tab 23 facing away from the first separator 22, or the second separator 24 is disposed on the surface of the positive electrode tab 21 facing away from the first separator 22.

In one embodiment, the hard upper cover 12 is made of a steel-plastic composite film, and the soft lower cover 13 is made of an aluminum-plastic composite film; simple structure and convenient processing.

Preferably, the steel-plastic composite film comprises a steel foil layer and a PP layer, and the aluminum-plastic composite film comprises the PP layer, a nylon layer and an aluminum foil layer sandwiched between the PP layer and the nylon layer; the PP layer of the hard upper cover 12 and the PP layer of the soft lower cover 13 are connected into a whole through a heat sealing process by the hard upper cover 12 and the soft lower cover 13; the sealing connection of the hard upper cover 12 and the soft lower cover 13 is realized through the sealing connection of the PP layer of the hard upper cover 12 and the PP layer of the soft lower cover 13, so that a wall body is formed between the PP layer of the hard upper cover 12 and the PP layer of the soft lower cover 13, the PP has good corrosion resistance, electrical insulation and plasticity, the cavity wall of the cavity 11 is prevented from being corroded, and the sealing connection of the hard upper cover 12 and the soft lower cover 13 is also facilitated.

In an embodiment, the pole core 2 is a roll core, the space in the shell 1 is fully utilized, and the anode tab 3 and the cathode tab 4 are both led out from the outermost layer of the roll core, so that the outer end of the anode tab 3 and the outer end of the cathode tab 4 can conveniently penetrate out of the shell 1.

In another embodiment, the pole piece 2 is a stacked piece.

In one embodiment, as shown in fig. 3, the hard top cap 12 includes a first cylindrical structure 122 opening downward and a first annular flange 121 disposed at the opening of the first cylindrical structure 122; the soft lower cover 13 is a plane sheet structure; the soft lower cover 13 is connected with the first annular flange 121 in a sealing way to seal the opening of the first cylindrical structure 122; the pole core 2 is accommodated in the hard upper cover 12, so that the deformation problem of the button battery in the production process is reduced, and the convenience of button battery assembly is improved.

Specifically, the aluminum-plastic composite film is heat sealed at the open end of the hard upper cover 12, thereby forming the soft lower cover 13 which is hermetically connected with the hard upper cover 12; simple structure and convenient processing.

In another embodiment, as shown in fig. 2, the hard top cap 12 includes a first cylindrical structure 122 opening downward and a first annular flange 121 disposed at the opening of the first cylindrical structure 122; the soft lower cover 13 includes a second cylindrical structure 132 with an upward opening and a second annular flange 131 provided at the opening of the second cylindrical structure 132;

the first annular flange 121 and the second annular flange 131 are butted to form a cavity 11 inside the hard upper cover 12 and the soft lower cover 13; the positive tab 3 and the negative tab 4 penetrate out of the butt joint gap of the first annular flange 121 and the second annular flange 131; the first annular flange 121 and the second annular flange 131 are hermetically connected through a heat sealing process, so that the hard upper cover 12 and the soft lower cover 13 are hermetically connected, heat sealing processing is facilitated, and the sealing performance between the hard upper cover 12 and the soft lower cover 13 is also improved.

Preferably, the barrel depth of the first barrel structure 122 is greater than the barrel depth of the second barrel structure 132; most of the pole core 2 is accommodated in the hard upper cover 12, so that the strength of the button cell is further improved, the deformation problem of the button cell in the production process is reduced, and the convenience of button cell assembly is improved.

In one embodiment, as shown in fig. 2, a first sealant 5 is disposed at the joint of the positive tab 3 and the positive plate 21; the first sealant 5 is arranged to cover the welding seal between the positive tab 3 and the positive plate 21, so as to prevent the positive plate 21 from being damaged.

In one embodiment, as shown in fig. 2, a second sealant 6 is disposed at the joint of the negative tab 4 and the negative plate 23; the second sealant 6 is arranged to cover the welding seal between the negative tab 4 and the negative plate 23, so as to prevent the negative plate 23 from being damaged.

In one embodiment, as shown in fig. 2, the section of the positive tab 3 located in the cavity 11 and not provided with the first sealant 5 and the section located in the butt joint gap between the first annular flange 121 and the second annular flange 131 are coated with the first tab glue 7; the first tab glue 7 is provided so that the positive tab 3 does not directly contact the first and second

annular flanges

121 and 131 at the butt seam of the first and second

annular flanges

121 and 131, thereby preventing the positive tab 3 from reacting with the first and second

annular flanges

121 and 131 to corrode the first and second

annular flanges

121 and 131, respectively.

A section of the negative tab 4, which is positioned in the cavity 11 and is not provided with the second sealant 6, and a section of the negative tab, which is positioned in a butt joint gap between the first annular flange 121 and the second annular flange 131, are coated with the second tab glue 8; the second tab paste 8 is provided such that the negative electrode tabs 4 do not directly contact the first and second

annular flanges

121 and 131 at the butt gaps of the first and second

annular flanges

121 and 131, thereby preventing the negative electrode tabs 4 from reacting with the first and second

annular flanges

121 and 131 to corrode the first and second

annular flanges

121 and 131, respectively.

In one embodiment, as shown in fig. 1 and 2, the first cylindrical structure 122 includes a first circular bottom 1221 and a first annular portion 1222 connecting the first circular bottom 1221 and the first annular flange 121, the first annular portion 1222 extends perpendicular to the first circular bottom 1221;

the second cylindrical structure 132 includes a second circular bottom 1321 and a second annular portion 1322 connecting the second circular bottom 1321 and the second annular flange 131, and an included angle between the extending direction of the second annular portion 1322 and the second circular bottom 1321 is an obtuse angle; the pole core 2 can be better accommodated in the cavity 11, and the leading-out of the positive tab 3 and the negative tab 4 is also facilitated.

Specifically, the first annular portion 1222 smoothly transitions with the first rounded bottom 1221.

Specifically, the second annular portion 1322 smoothly transitions with the second rounded bottom 1321.

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. A button battery is characterized by comprising a shell and a pole core, wherein the pole core is accommodated in a cavity of the shell and comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, a positive tab is led out of the positive plate, and a negative tab is led out of the negative plate;

2. The button cell as claimed in claim 1, wherein the hard upper cover is made of a steel-plastic composite film, and the soft lower cover is made of an aluminum-plastic composite film.

3. The button battery as claimed in claim 2, wherein the steel-plastic composite film comprises a steel foil layer and a PP layer, and the aluminum-plastic composite film comprises a PP layer, a nylon layer and an aluminum foil layer sandwiched between the PP layer and the nylon layer; the hard upper cover and the soft lower cover are connected into a whole through a PP layer of the hard upper cover and a PP layer of the soft lower cover through a heat sealing process.

4. The button cell according to claim 1, wherein the hard upper cover comprises a first cylindrical structure with a downward opening and a first annular flange disposed at an opening of the first cylindrical structure; the soft lower cover is of a plane sheet structure; the soft lower cover is connected with the first annular flange in a sealing mode to seal the opening of the first cylindrical structure.

5. The button cell according to claim 1, wherein the hard upper cover comprises a first cylindrical structure with a downward opening and a first annular flange disposed at an opening of the first cylindrical structure; the soft lower cover comprises a second cylindrical structure with an upward opening and a second annular flange arranged at the opening of the second cylindrical structure;

6. The button cell as defined in claim 5, wherein the first cylindrical structure has a larger barrel depth than the second cylindrical structure.

7. The button cell according to claim 5, wherein a first sealant is disposed at the junction of the positive tab and the positive plate, and a second sealant is disposed at the junction of the negative tab and the negative plate.

8. The button battery according to claim 7, wherein a section of the positive tab located in the cavity and not provided with the first sealant and a section of the positive tab located in the butt joint gap between the first annular flange and the second annular flange are coated with a first tab adhesive, and a section of the negative tab located in the cavity and not provided with the second sealant and a section of the negative tab located in the butt joint gap between the first annular flange and the second annular flange are coated with a second tab adhesive.

9. The button cell according to claim 5, wherein the first cylindrical structure comprises a first circular bottom and a first annular portion connecting the first circular bottom and the first annular flange, the first annular portion extending in a direction perpendicular to the first circular bottom;

10. The button cell according to claim 9, wherein the first annular portion is in smooth transition with the first rounded bottom portion;