CN114006089A

CN114006089A - Button cell

Info

Publication number: CN114006089A
Application number: CN202010738254.9A
Authority: CN
Inventors: 周志勇; 刘盛发; 韩子勤; 席鹏飞
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2022-02-01

Abstract

The invention relates to a button battery which comprises a shell, a shell cover assembly and a soft package battery cell, wherein the shell cover assembly comprises a shell cover and a shell cover; the shell cover assembly covers the opening of the shell to form an accommodating cavity at the inner sides of the shell and the shell, and the soft package battery cell is accommodated in the accommodating cavity; a first tab and a second tab with different polarities are led out of the soft-packaged cell; the shell cover assembly comprises an insulating cover, an electrode plate and an inner connecting plate; the edge of the insulating cover is in insulated connection with the opening of the shell, the electrode plate is connected to one side, far away from the soft-package battery cell, of the insulating cover, the inner connecting plate is connected to one side, close to the soft-package battery cell, of the insulating cover, a through hole penetrating through the insulating cover is formed in the insulating cover, an electric connecting piece is arranged in the through hole, and the electrode plate and the inner connecting plate are electrically connected through the electric connecting piece; the first tab is electrically connected with the shell, and the second tab is electrically connected with the inner connecting sheet. Compared with a button battery additionally provided with an insulating layer, the button battery provided by the invention has the advantages that the size of the button battery is reduced, the energy density of the button battery is improved, the button battery is easy to produce in a large scale, the production efficiency is improved, and the production cost is reduced.

Description

Button cell

Technical Field

The invention belongs to the technical field of batteries, and particularly relates to a button battery.

Background

The button cell is also called as button cell, which is a cell with the external dimension like a small button, generally has larger diameter and 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 cells are more and more deeply inserted into the lives of people, so that the requirements on the button cells are higher and higher.

The existing hard shell button battery comprises an upper cover, a lower cover, an insulating layer and a soft package battery cell, wherein the upper cover and the lower cover are connected in an insulating way through the insulating layer, and a cavity for accommodating the soft package battery cell is formed on the inner sides of the upper cover and the lower cover. However, the insulating layer is arranged between the upper cover and the lower cover, so that the size of the button cell is increased, the energy density of the button cell is reduced, the processing technology is complex, the production efficiency is low, and the cost is high.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the button cell is provided aiming at the problems of low production efficiency and high cost of the existing button cell.

In order to solve the technical problem, an embodiment of the invention provides a button battery, which comprises a shell, a shell cover assembly and a soft package battery cell; the shell cover assembly is covered at the opening of the shell to form an accommodating cavity at the inner sides of the shell and the shell cover assembly, and the soft package battery cell is accommodated in the accommodating cavity; a first tab and a second tab with different polarities are led out of the soft-packaged cell;

the shell cover assembly comprises an insulating cover, an electrode plate and an inner connecting plate; the edge of the insulating cover is in insulated connection with the shell, the electrode plate is connected to one side, far away from the soft package battery cell, of the insulating cover, the internal connecting piece is connected to one side, close to the soft package battery cell, of the insulating cover, a through hole penetrating through the insulating cover is formed in the insulating cover, an electric connecting piece is arranged in the through hole, and the electrode plate and the internal connecting piece are electrically connected through the electric connecting piece;

the first tab is electrically connected with the shell, and the second tab is electrically connected with the inner connecting piece.

Optionally, the electrical connector is a conductive layer disposed on an inner wall of the through hole or a conductive pillar inserted into the through hole.

Optionally, one side of the insulating cover, which is far away from the soft package battery cell, is provided with a first groove, and the electrode plate is fixed in the first groove.

Optionally, one side of the insulating cover, which is close to the soft-package battery cell, is provided with a second groove, and the inner connecting piece is fixed in the second groove.

Optionally, the case cover assembly further comprises an elastic connecting piece connected to one side of the insulating cover close to the soft package battery core, and one end of the elastic connecting piece, which is far away from the insulating cover, is fixedly connected to the case; the elastic connecting piece is respectively connected with the electrode plate and the inner connecting piece in an insulating way.

Optionally, the inside wall of the casing is provided with an annular flange protruding inwards, the outside wall of the elastic connecting piece is provided with an annular groove recessed inwards, and the annular flange is clamped with the annular groove.

Optionally, the elastic connecting piece is provided with a first notch for avoiding the first tab and a second notch for avoiding the second tab.

Optionally, the soft packaging core comprises a soft packaging shell and a pole core, wherein the soft packaging shell comprises an inner shell wrapping the pole core and a folded edge sealing the inner shell; the first tab is led out from the pole core and penetrates out of the soft cladding shell from the folded edge, and the second tab is led out from the pole core and penetrates out of the soft cladding shell from the folded edge.

Optionally, the first tab is welded with the inner wall of the shell, and a first insulating layer is attached to the portion of the first tab, which is exposed out of the soft clad shell, except for the welding point;

and the second lug is welded with the inner connecting sheet, and a second insulating layer is attached to the part of the second lug, which is exposed out of the soft clad, except the welding point.

Optionally, a third insulating layer is attached to an inner side wall of the housing.

Compared with the prior art, the button cell provided by the embodiment of the invention has the advantages that the insulating cover is integrated on the shell cover component and fixedly connected with the shell, the internal connecting sheet and the electrode sheet are respectively arranged on two end faces of the insulating cover and are electrically connected through the electric connecting piece, the first tab is electrically connected with the shell, the second tab is electrically connected with the internal connecting sheet arranged on the insulating cover, the shell cover component is connected with the shell in an insulating way, short circuit between the shell and the internal connecting sheet is avoided, and the button cell is conveniently and electrically connected with other elements; compared with a button battery additionally provided with an insulating layer, the size of the button battery is reduced, the energy density of the button battery is improved, the situation of short circuit caused by the fact that the insulating layer is punctured can be avoided, the use safety of the button battery is improved, the processing difficulty of the button battery is reduced, the overall structure is simple, the button battery is beneficial to production and assembly, mass production is easy, the production efficiency is improved, and the production cost is reduced.

Drawings

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

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

FIG. 3 is a cross-sectional view B-B of FIG. 1;

fig. 4 is an exploded view of a button cell according to another embodiment of the present invention;

FIG. 5 is a schematic structural view of the insulation cover of FIG. 4;

FIG. 6 is a schematic view of the construction of the resilient connector of FIG. 4;

fig. 7 is a schematic structural view of the housing in fig. 4.

The reference numerals in the specification are as follows:

1. a housing; 11. an annular flange;

2. a housing cover assembly; 21. an insulating cover; 211. a through hole; 212. a first groove; 213. a second groove; 214. a third groove; 22. an electrode sheet; 23. an interconnecting piece; 24. an elastic connecting member; 241. an annular groove; 242. a first notch; 243. a second notch;

3. soft-packaged battery cells; 31. a first tab; 32. a second tab; 33. an inner shell; 34. folding edges;

4. a second insulating layer; 5. a third insulating layer; 6. and a fourth insulating layer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, fig. 2 and fig. 4, the button cell provided in the embodiment of the present invention includes a casing 1, a casing cover assembly 2 and a soft package cell 3; the shell cover assembly 2 covers the opening of the shell 1 to form an accommodating cavity at the inner sides of the shell cover assembly and the shell 1, and the soft package battery core 3 is accommodated in the accommodating cavity; the soft package battery core 3 is provided with a first tab 31 and a second tab 32 with different polarities;

the shell cover assembly 2 comprises an insulating cover 21, an electrode plate 22 and an inner connecting plate 23; the edge of the insulating cover 21 is in insulated connection with the shell 1, the electrode plate 22 is connected to one side of the insulating cover 21 far away from the soft package cell 3, the inner connecting plate 23 is connected to one side of the insulating cover 21 near the soft package cell 3, a through hole 211 penetrating through the insulating cover 21 is formed in the insulating cover 21, an electric connecting piece (not shown in the figure) is arranged in the through hole 211, and the electrode plate 22 and the inner connecting plate 23 are electrically connected through the electric connecting piece;

the first tab 31 is electrically connected to the case 1, and the second tab 32 is electrically connected to the interconnector plate 23.

Compared with the prior art, the button cell provided by the embodiment of the invention has the advantages that the insulating cover 21 is integrated on the shell cover component 2 and fixedly connected with the shell 1, the inner connecting sheet 23 and the electrode sheet 22 are respectively arranged on two end faces of the insulating cover 21 and are electrically connected through the electric connecting piece, the first tab 31 is electrically connected with the shell 1, and the second tab 32 is electrically connected with the inner connecting sheet 23 arranged on the insulating cover 21, so that the insulating connection between the shell cover component 2 and the shell 1 is realized, the short circuit between the shell 1 and the inner connecting sheet 23 is avoided, and the button cell is conveniently and electrically connected with other elements; compared with a button battery additionally provided with an insulating layer, the size of the button battery is reduced, the energy density of the button battery is improved, the situation of short circuit caused by the fact that the insulating layer is punctured can be avoided, the use safety of the button battery is improved, the processing difficulty of the button battery is reduced, the overall structure is simple, the button battery is beneficial to production and assembly, mass production is easy, the production efficiency is improved, and the production cost is reduced.

It should be noted that the case 1 is an electric conductor, and the case 1 is connected to the interconnector 23 and the electrode plate 22 in an insulated manner.

In one embodiment, as shown in fig. 2, the center lines of electrode sheet 22, insulating cover 21, and interconnector 23 are located on the same axis; the through hole 211 is located at the center of the insulating cover 21; the shell 1 is prevented from being in contact with the inner connecting sheet 23 or the electrode sheet 22, so that the shell is electrically connected, and the shell is simple in structure and convenient to process and mount.

In an embodiment, not shown in the figures, the electrical connections are conductive layers disposed on the inner walls of the vias 211; simple structure, and convenient processing and installation.

In another embodiment, not shown, the electrical connections are conductive posts interspersed within vias 211; simple structure, the electric connection effect is stable.

Preferably, the conductive posts are integrally formed with electrode sheet 22; the stability of the electrical connection between the electrode plate 22 and the inner connecting plate 23 is increased, and the processing and the installation are convenient.

Preferably, the conductive posts are integrally formed with the interconnector sheet 23; the stability of the electrical connection between the electrode plate 22 and the inner connecting plate 23 is increased, and the processing and the installation are convenient.

In an embodiment, as shown in fig. 4, a first groove 212 is formed on a side of the insulating cover 21 away from the soft package core 3, and the electrode sheet 22 is fixed in the first groove 212; the stability of electrode slice 22 and insulating cover 21 connection is increased, the compactness of button cell overall structure is improved, the size of button cell is prevented from being increased too much, the structure is simple, and the installation is convenient.

Specifically, the electrode sheet 22 may be fixed on the insulating cover 21 by injection molding or by a patch method.

Preferably, the thickness of electrode sheet 22 is not less than the depth of first groove 212; facilitating the mounting of electrode pad 22 within first recess 212 and facilitating the connection of electrode pad 22 to other electronic components.

In an embodiment, as shown in fig. 5, a second groove 213 is formed on one side of the insulating cover 21 close to the soft packing core 3, and the interconnector 23 is fixed in the second groove 213; the stability of the connection of the inner connecting piece 23 and the insulating cover 21 is improved, the compactness of the whole structure of the button cell is improved, the size of the button cell is prevented from being excessively increased, the structure is simple, and the button cell is convenient to install.

Specifically, the interconnector sheet 23 may be fixed to the insulating cover 21 by injection molding or by a die bonding.

Preferably, the thickness of the interconnector 23 is not less than the depth of the second recess 213; the mounting of the interconnector plate 23 in the second recess 213 is facilitated, and the connection of the interconnector plate 23 to the second pole piece 32 is also facilitated.

In an embodiment, as shown in fig. 3 and 4, the case cover assembly 2 further includes an elastic connecting member 24 connected to a side of the insulating cover 21 close to the soft package core 3, and an end of the elastic connecting member 24 away from the insulating cover 21 is fixedly connected to the case 1; the elastic connecting piece 24 is respectively connected with the electrode plate 22 and the inner connecting piece 23 in an insulating way; simple structure improves the convenience and the steadiness that cap subassembly 2 and casing 1 are connected.

Specifically, as shown in fig. 5, a third groove 214 is further formed in one side of the insulating cover 21 close to the soft package core 3, and the elastic connecting member 24 is fixed in the third groove 214; the stability of the connection between the elastic connecting piece 24 and the insulating cover 21 is improved, the compactness of the overall structure of the button cell is improved, the size of the button cell is prevented from being excessively increased, the structure is simple, and the installation is convenient.

Specifically, the elastic connection member 24 may be fixed to the insulation cover 21 by injection molding or by a patch or the like.

In one embodiment, as shown in fig. 6 and 7, the inner side wall of the housing 1 is provided with an annular flange 11 protruding inwards, the outer side wall of the elastic connecting piece 24 is provided with an annular groove 241 recessed inwards, and the annular flange 11 is clamped with the annular groove 241; the convenience and the stability of connecting the shell cover assembly 2 and the shell body 1 are improved, the structure is simple, and the processing and the installation are convenient.

In one embodiment, as shown in fig. 6, the elastic connector 24 is provided with a first notch 242 for avoiding the first tab 31 and a second notch 243 for avoiding the second tab 32; the button cell structure has the advantages that the button cell structure is convenient to electrically connect the first lug 31 and the shell 1 and the second lug 32 and the inner connecting sheet 23, the size increase of the button cell can be reduced, meanwhile, the button cell structure is of a semi-sealed structure, a certain expansion space is provided for the overcharged button cell, and the use safety of the button cell is improved.

Specifically, the lead-out positions of the first tab 31 and the second tab 32 are circumferentially different by 180 degrees; the distance between the first tab 31 and the second tab 32 is increased, so that the first tab 31 and the second tab 32 can be conveniently led out, and the interference between the first tab 31 and the second tab 32 is avoided.

In one embodiment, as shown in fig. 4, the flexible packaging core 3 includes a flexible packaging shell and a pole core, the flexible packaging shell includes an inner shell 33 wrapping the pole core and a folded edge 34 sealing the inner shell 33; the first tab 31 is drawn from the pole core and out of the bladder at fold 34 and the second tab 32 is drawn from the pole core and out of the bladder at fold 34.

Preferably, a fourth insulating layer 6 is attached to the outer side wall of the folded edge 34; the function of insulation protection is achieved, and short circuit inside the button cell is avoided.

In one embodiment, not shown, the first tab 31 is welded to the inner wall of the casing 1, and a first insulating layer is attached to a portion of the first tab 31 other than the welding point of the portion exposed from the soft clad; the first insulating layer plays an insulating protection role for the first tab 31, and short circuit inside the button cell is avoided.

In one embodiment, as shown in fig. 4, the second pole ear 32 is welded to the interconnector sheet 23, and the second insulating layer 4 is attached to a portion of the second pole ear 32 other than the welding point of the portion exposed out of the bladder; the second insulating layer 4 plays an insulating protection role for the second pole lug 32, and short circuit inside the button cell is avoided.

In one embodiment, as shown in fig. 4, a third insulating layer 5 is attached to the inner side wall of the housing 1; further plays a role of insulation protection, and the second pole lug 32 is prevented from being electrically connected with the shell 1 to generate short circuit.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle 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, a shell cover assembly and a soft package battery cell; the shell cover assembly is covered at the opening of the shell to form an accommodating cavity at the inner sides of the shell and the shell cover assembly, and the soft package battery cell is accommodated in the accommodating cavity; a first tab and a second tab with different polarities are led out of the soft-packaged cell;

2. The button cell according to claim 1, wherein the electrical connection is a conductive layer disposed on an inner wall of the through hole or a conductive post inserted in the through hole.

3. The button cell according to claim 1, wherein a first groove is formed in a side of the insulating cover away from the soft package core, and the electrode sheet is fixed in the first groove.

4. The button cell according to claim 1, wherein a second groove is formed in one side of the insulating cover close to the soft package core, and the interconnector is fixed in the second groove.

5. The button battery according to claim 1, wherein the case cover assembly further comprises an elastic connecting piece connected to one side of the insulating cover close to the soft package core, and one end of the elastic connecting piece, which is far away from the insulating cover, is fixedly connected with the case; the elastic connecting piece is respectively connected with the electrode plate and the inner connecting piece in an insulating way.

6. The button cell as claimed in claim 5, wherein the inner side wall of the housing is provided with an annular flange protruding inwards, the outer side wall of the elastic connecting piece is provided with an annular groove recessed inwards, and the annular flange is clamped with the annular groove.

7. The button cell according to claim 5, wherein the elastic connecting piece is provided with a first notch for avoiding the first tab and a second notch for avoiding the second tab.

8. The button cell of claim 1, wherein the pouch cell comprises a pouch shell and a pole core, the pouch shell comprising an inner shell surrounding the pole core and a flap sealing the inner shell; the first tab is led out from the pole core and penetrates out of the soft cladding shell from the folded edge, and the second tab is led out from the pole core and penetrates out of the soft cladding shell from the folded edge.

9. The button cell according to claim 8, wherein the first tab is welded to the inner wall of the case, and a first insulating layer is attached to a portion of the first tab other than the welding point of the portion of the first tab exposed out of the soft can;

10. The button cell as claimed in claim 8, wherein a third insulating layer is attached to an inner side wall of the case.