WO2022134218A1

WO2022134218A1 - Button battery casing and button battery

Info

Publication number: WO2022134218A1
Application number: PCT/CN2021/070519
Authority: WO
Inventors: 张健; 陈燕平
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声精密制造科技(常州)有限公司
Priority date: 2020-12-21
Filing date: 2021-01-06
Publication date: 2022-06-30
Also published as: CN214313350U

Abstract

Provided are a button battery casing (100) and a button battery (300) having same. The button battery casing comprises a main casing body (1) and a cover plate (2), the main casing body is an electrically insulating casing having an accommodating cavity (01), the accommodating cavity is provided with an opening (001), and the cover plate covers an end part of the opening and covers the accommodating cavity; the cover plate comprises a first conductor part (21), a second conductor part (22), and an insulating part (23) which is disposed between the two conductor parts and which is used for preventing the two conductor parts from mutually conducting, the insulating part has a first end surface (231) and a second end surface (232) that are oppositely arranged, the first end surface and the second end surface both face a side wall (12) of the accommodating cavity, the first conductor part extends in the direction from the first end surface towards the side wall opposite to the first end surface, and the second conductor part extends in the direction from the second end surface towards the side wall opposite to the second end surface. A winding core (4) accommodated in the accommodating cavity comprises a positive electrode piece (41), a negative electrode piece (42), and a separator (43), and the first conductor part and the second conductor part on the cover plate may be respectively used as the positive electrode lead-out end of the positive electrode piece and the negative electrode lead-out end of the negative electrode piece. The described battery casing is beneficial for improving the effective volume and capacity of a button battery, and at the same time, shortens the duration of a welding process for positive and negative electrode lead-outs of a winding core, and production efficiency is improved.

Description

Button battery case and button battery

technical field

The present application relates to the technical field of batteries, and in particular, to a button-type battery case and a button-type battery.

Background technique

Due to its small size, button batteries are widely used in various micro electronic products such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids, counters, cameras, etc. as a power supply or backup power supply. However, in the current button battery, the opposite ends of the shell are used as the positive and negative electrodes, which will cause the space of the accommodating cavity of the button battery to accommodate the winding core to be occupied by the lead-out wire. The surface is covered with insulating film to insulate from the casing. Whether the positive and negative electrodes are drawn at both ends or the winding core is covered with insulating film, the effective volume of the coin-type battery accommodating cavity is reduced, which is not conducive to increasing the coin-type battery accommodating space. The capacity of the button battery is increased under the premise of the cavity.

Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems of the button battery.

technical problem

One of the objectives of the present application is to provide a button-type battery case to solve the problems of the existing button-type battery having a small effective storage volume, which is not conducive to improving the battery capacity.

technical solutions

The technical solution provided by one of the purposes of this application is as follows:

A button-type battery case, the button-type battery case includes a main case and a cover plate, the main case is an electrical insulating case with a accommodating cavity, the accommodating cavity is provided with an opening, and the cover plate cover is provided at the the open end and cover the accommodating cavity;

The cover plate includes a first conductor portion, a second conductor portion, and is provided between the first conductor portion and the second conductor portion for preventing the first conductor portion and the second conductor portion from being mutually a conductive insulating part, the insulating part has a first end face and a second end face opposite to each other, and both the first end face and the second end face face the side wall of the accommodating cavity, and the first conductor part The second conductor portion extends from the first end face in the direction of the side wall opposite to the first end face, and the second conductor portion extends from the second end face in the direction of the side wall opposite to the second end face extend.

Preferably, the main casing comprises a circular bottom plate disposed opposite to the cover plate and the sidewalls extending from the edge of the circular bottom plate toward the cover plate, the cover plate covering On the end face of the side wall facing away from the circular bottom plate.

Preferably, the side wall includes an annular support portion extending from an edge of the circular bottom plate toward the cover plate, and a convex portion extending toward the cover plate from an end surface of the annular support portion facing away from the circular bottom plate. A limiting portion is provided, and the cover plate is covered on the end surface of the annular support portion facing away from the circular bottom plate and abuts against the limiting portion.

Preferably, the side wall comprises an annular support portion protruding from the circular bottom plate and facing the cover plate, and a protrusion extending toward the cover plate from an end surface of the annular support portion facing away from the circular bottom plate. The cover plate is protruded with an annular locking portion facing the side wall, and the annular locking portion extends from the surface of the cover plate toward the side wall to the surface away from the cover plate. Extending in the direction of the central axis, the annular clamping portion is clamped on the end face of the limiting portion, and both the first conductor portion and the second conductor portion abut on the end face of the annular support portion.

Preferably, the cover plate is protruded with an annular positioning portion facing the circular bottom plate, and an end surface of the side wall facing away from the circular bottom plate is provided with an annular recess that is snap-fitted with the annular positioning portion groove.

Preferably, the cover plate is protruded with an annular positioning portion facing the circular bottom plate, and the annular positioning portion abuts on the outer wall surface of the side wall or abuts on the inner wall surface of the side wall.

Preferably, the electrical insulating shell is selected from any one of an insulating plastic shell, an insulating ceramic shell, and an insulating glass shell.

Preferably, both the first conductor part and/or the second conductor part are stainless steel blocks; the insulating part is a polyether ether ketone board or a polyphthalamide board.

The second purpose of this application is to provide a button battery.

A button-type battery includes an outer shell with an accommodating cavity and a winding core accommodated in the accommodating cavity, the outer shell is the aforementioned button-type battery shell, and the winding core includes a positive electrode sheet, a negative electrode sheet, and a core disposed on the positive electrode. A separator is used between the sheet and the negative sheet to prevent the positive electrode sheet and the negative electrode sheet from conducting with each other, and the positive electrode sheet is electrically connected to the first conductor part, and the negative electrode sheet is electrically connected to the first conductor part. Two conductors.

Preferably, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer formed on the surface of the positive electrode current collector, the positive electrode current collector is electrically connected to the first conductor part, and the negative electrode sheet comprises a negative electrode current collector and a positive electrode active layer formed on the surface of the positive electrode current collector. coating the negative electrode active layer formed on the surface of the negative electrode current collector, the negative electrode current collector is electrically connected to the second conductor part; or/and,

The winding core further includes a positive electrode connection piece and a negative electrode connection piece, one end of the positive electrode connection piece is connected to the positive electrode piece, the other end is connected to the first conductor part, one end of the negative electrode connection piece is connected to the negative electrode piece, and the other end is connected to the negative electrode piece. The second conductor portion is connected.

beneficial effect

The beneficial effect of the present application is: compared with the prior art, in the button battery case and button battery provided by the present application, on the one hand, the cover plate is provided with a first conductor part and a second conductor part, which can be used as positive electrode pieces respectively. The positive terminal and the negative terminal of the negative plate realize the same-side lead-out of the button battery, which can reduce the space required for the lead-out of the winding core. The insulating film between the main casings can effectively increase the effective volume of the button battery, so that the button battery can accommodate more winding cores under the premise of the same accommodating cavity, which is more conducive to improving the capacity of the button battery . In addition, since the positive electrode sheet and the negative electrode sheet are drawn from the same side, the time for the welding process of the positive and negative electrodes during the manufacturing process of the button battery can be effectively shortened, and the production efficiency can be improved.

Description of drawings

FIG. 1 is a schematic three-dimensional structural diagram of a button battery case provided in an embodiment of the present application;

Fig. 2 is a schematic cross-sectional view along line A-A of Fig. 1;

3 is a schematic diagram of the explosion structure of the button battery case provided in Example 1;

4 is a simplified schematic diagram of the interior of the button battery provided in Embodiment 1;

5 is a schematic structural diagram of the main casing provided in Embodiment 2;

6 is a schematic structural diagram of a cover plate provided in Embodiment 3;

7 is a schematic structural diagram of the main casing provided in Embodiment 4;

8 is a schematic structural diagram of the cover plate provided by Embodiment 4 and Embodiment 5;

FIG. 9 is a schematic structural diagram of the cover plate provided in Embodiment 6. FIG.

Description of reference numbers:

100. Button battery case;

1. Main shell;

11, circular bottom plate; 12, side wall; 121, annular support part; 122, limit part; 123, annular groove;

2. Cover;

21, the first conductor part; 22, the second conductor part; 23, the insulating part; 231, the first end face; 232, the second end face;

01, accommodating cavity; 001, opening;

300, button battery;

3. Shell;

4. Roll core;

41, positive electrode sheet; 42, negative electrode sheet; 43, diaphragm; 44, positive electrode connecting sheet; 45, negative electrode connecting sheet.

Embodiments of the present application

1 to 9 are schematic structural diagrams of a button battery case 100 and a button battery 300 according to an embodiment of the present application.

Example 1

As shown in FIG. 1 to FIG. 3 , this embodiment provides a button battery case 100 .

Please refer to FIGS. 1 , 2 , 3 and 4 , the button battery case 100 includes a main case 1 and a cover plate 2 , wherein the main case 1 is an electrical insulating case with an accommodating cavity 01 , and the accommodating cavity 01 is provided with For the opening 001, the cover plate 2 covers the end of the opening 001 and covers the accommodating cavity 01. Specifically, the cover plate 2 includes a first conductor part 21 , a second conductor part 22 and an insulating part 23 , wherein the insulating part 23 is provided between the first conductor part 21 and the second conductor part 22 and is used to prevent the first conductor part 21 and the second conductor portion 22 are connected to each other, the insulating portion 23 has a first end face 231 and a second end face 232, and the first end face 231 and the second end face 232 are arranged oppositely, and both the first end face 231 and the second end face 232 are facing The side wall 12 of the accommodating cavity 01 is provided, the first conductor portion 21 extends from the first end face 231 toward the side wall 12 opposite to the first end face 231 , and the second conductor portion 22 extends from the second end face 232 toward the second end face 232 The opposite side walls 12 extend in the direction.

In this embodiment, the first conductor part 21 can be used as the positive terminal of the button battery case 100 , the second conductor part 22 can be used as the negative terminal of the button battery case 100 , or the first conductor part 21 can be used as the button battery case 100 and the second conductor portion 22 is used as the positive terminal of the button battery case 100. When the accommodating cavity 01 of the button battery case 100 accommodates the winding core 4 including the positive electrode sheet 41 and the negative electrode sheet 42, the positive electrode sheet 41 and the The positive terminal is electrically connected, and the negative terminal 42 is electrically connected to the negative terminal, so that the positive and negative poles of the winding core 4 can be drawn out from the same side, which can reduce the space required for the positive pole 41 and the negative pole 42 of the winding core 4 to be drawn out. The body 1 is electrically insulated, and the insulating film between the winding core 4 and the main casing 1 can be omitted. Therefore, this embodiment can effectively increase the effective volume of the button battery case 100 , so that the winding core 4 can be accommodated in the same accommodating cavity 01 . In addition, the time required for the welding process of the positive and negative electrodes of the winding core 4 during the manufacturing process of the button battery can be shortened, and the production efficiency can be improved.

In a specific application, the housing includes a circular bottom plate 11 and a side wall 12 , the circular bottom plate 11 and the cover plate 2 are arranged opposite to each other, and the side wall 12 extends from the edge of the circular bottom plate 11 toward the cover plate 2 , and is formed by The circular bottom plate 11 and the side wall 12 are enclosed to form a receiving cavity 01 with an opening 001, and the opening 001 is arranged opposite to the circular bottom plate 11, and the cover plate 2 is covered on the end face of the side wall 12 facing away from the circular bottom plate 11 And cover the accommodating cavity 01 . As some implementations of this embodiment, the electrical insulating shell is selected from any one of an insulating plastic shell, an insulating ceramic shell, and an insulating glass shell, and these electrical insulating shells have properties of high temperature resistance and high electrolyte corrosion at the same time. In other embodiments, the first conductor portion 21 and/or the second conductor portion 22 are both stainless steel blocks, the insulating portion 23 is a polyether ether ketone plate or a polyphthalamide plate, and the first conductor portion 21 and The insulating part 23 and the second conductor part 22 and the insulating part 23 can be connected by nano-injection molding, melt injection molding, laser welding, etc., and thus the cover plate 2 can be obtained.

This embodiment also provides a button-type battery 300. Please refer to FIG. 1 to FIG. 4 for details. The button-type battery 300 includes an outer shell 3, a winding core 4 and an electrolyte. The outer shell 3 is the above-mentioned button battery shell 100, and the outer shell 3 has In the accommodating cavity 01, the winding core 4 is accommodated in the accommodating cavity 01, and the winding core 4 includes a positive electrode sheet 41, a negative electrode sheet 42 and a separator 43, wherein the separator 43 is arranged between the positive electrode sheet 41 and the negative electrode sheet 42 to prevent the positive electrode The sheet 41 and the negative electrode sheet 42 are connected to each other to cause a short circuit. At the same time, the diaphragm 43 is also used to pass lithium ions, and the electrolyte is absorbed in the positive electrode sheet 41, the negative electrode sheet 42 and the diaphragm 43. The positive electrode sheet 41 is electrically connected to the first conductor part. 21. The negative electrode sheet 42 is electrically connected to the second conductor part 22 .

In a specific application, the positive electrode sheet 41 includes a positive electrode current collector and a positive electrode active layer coated on the surface of the positive electrode current collector, and the negative electrode sheet 42 includes a negative electrode current collector and a negative electrode active layer coated on the surface of the negative electrode current collector. Including a coated area and a non-coated area, the non-coated area of the positive electrode current collector is directly used as the positive electrode tab of the positive electrode sheet 41, and the positive electrode tab is used to connect the positive electrode sheet 41 with other conductive parts to lead out the positive electrode sheet 41, and the negative electrode current collector is the same It includes a coated area and a non-coated area. The non-coated area of the negative electrode current collector is directly used as the negative electrode tab of the negative electrode sheet 42 , and the negative electrode tab is used to connect the negative electrode sheet 42 with other conductive components to lead out the negative electrode sheet 42 . The positive tab and the negative tab are electrically connected to the first conductor part 21 and the second conductor part 22 respectively, so that the winding core 4 can be connected to the external wire through the first conductor part 21 and the second conductor part 22 . In some implementations of this embodiment, the winding core 4 further includes a positive electrode connecting piece 44 and a negative electrode connecting piece 45 , wherein one end of the positive electrode connecting piece 44 is connected to the positive electrode piece 41 (specifically connected to the positive electrode ear), and the other end is connected to the first conductor part 21, one end of the negative electrode connecting piece 45 is connected to the negative electrode piece 42 (specifically connected to the negative electrode tab), and the other end is connected to the second conductor part 22, wherein both the positive electrode connecting piece 44 and the negative electrode connecting piece 45 can be nickel pieces. In some implementations of this embodiment, the positive tab and the positive connecting piece 44 , the positive connecting piece 44 and the first conductor part 21 , the negative tab and the negative connecting piece 45 , the negative connecting piece 45 and the second conductor part 22 can all pass through the The connection is realized by means of resistance welding; the cover plate 2 and the main shell 1 can be sealed and welded by means of laser welding, melt injection molding, etc., so as to improve the bonding strength of the cover plate 2 and the main shell 1 .

Embodiment 2

Please refer to FIG. 1 , FIG. 4 and FIG. 5 , the difference between this embodiment and the first embodiment mainly lies in whether the side wall 12 has a limiting portion 122 . In the first embodiment, the end face of the side wall 12 facing the cover plate 2 is a plane, and the cover plate 2 can be directly covered on the end face of the side wall 12 . In this embodiment, the side wall 12 includes an annular support portion 121 and a limit portion 122 , wherein the annular support portion 121 extends from the edge of the circular bottom plate 11 toward the cover plate 2 , and the limit portion 122 extends from the annular support portion 121 . The end surface facing away from the circular bottom plate 11 extends and protrudes toward the cover plate 2 . The cover plate 2 is covered on the end surface of the annular support portion 121 facing away from the circular bottom plate 11 and abuts against the limiting portion 122 .

In addition to the above differences, other structures of the button battery case 100 and the button battery 300 provided in this embodiment can be optimally designed with reference to the first embodiment, and will not be described in detail here.

Embodiment 3

Please refer to FIG. 1 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , the difference between this embodiment and the second embodiment mainly lies in whether the cover plate 2 has a ring-shaped retaining portion 24 . In the second embodiment, the cover plate 2 is a flat plate including the first conductor portion 21, the second conductor portion 22 and the insulating portion 23, and the cover plate 2 is directly covered on the end face of the annular support portion 121 facing away from the circular bottom plate 11 and abuts against it. It is enough to connect with the limiting part 122 . In the present embodiment, the cover plate 2 is protruded with an annular locking portion 24 facing the side wall 12 . The annular locking portion 24 extends from the surface of the cover plate 2 toward the side wall 12 to a direction away from the central axis of the cover plate 2 Extendingly arranged, the annular clamping portion 24 is clamped on the end face of the limiting portion 122 and the partial first conductor portion 21 , the second conductor portion 22 and the insulating portion 23 are all abutted against the end face of the annular support portion 121 .

Except for the above differences, other structures of the button battery case 100 and the button battery 300 provided in this embodiment can be optimally designed with reference to the second embodiment, and will not be described in detail here.

Embodiment 4

Please refer to FIGS. 1 , 3 , 4 , 7 and 8 . The difference between this embodiment and the first embodiment is whether the side wall 12 has an annular groove 123 and whether the cover plate 2 has a facing side wall 12 or not. Annular positioning portion 25 at the end. In the first embodiment, the end face of the side wall 12 facing the cover plate 2 is a plane, the cover plate 2 is a flat plate including the first conductor portion 21 , the second conductor portion 22 and the insulating portion 23 , and the cover plate 2 is directly covered on the side wall. The end face of 12 can be used. In this embodiment, an annular groove 123 is formed on the end face of the side wall 12 away from the circular bottom plate 11 , and the cover plate 2 is protruded with an annular positioning portion 25 facing the circular bottom plate 11 . When the casing 1 is mounted, the annular positioning portion 25 is snap-fitted with the annular groove 123 .

Embodiment 5

Please refer to FIG. 1 , FIG. 3 , FIG. 4 and FIG. 8 . The difference between this embodiment and the first embodiment mainly lies in whether the cover plate 2 is provided with an annular positioning portion 25 facing the end of the side wall 12 . In the first embodiment, the cover plate 2 is a flat plate including the first conductor portion 21 , the second conductor portion 22 and the insulating portion 23 , and the cover plate 2 can be directly covered on the end face of the side wall 12 . In this embodiment, the cover plate 2 is protruded with an annular positioning portion 25 facing the circular bottom plate 11 .

Embodiment 6

Please refer to FIG. 1 , FIG. 3 , FIG. 4 , FIG. 8 and FIG. 9 , the difference between this embodiment and the first embodiment mainly lies in whether the cover plate 2 is provided with an annular positioning portion 25 facing the end of the side wall 12 . The main difference is whether the annular positioning portion 25 abuts on the outer wall surface or the inner wall surface of the side wall 12 . In the first embodiment, the cover plate 2 is a flat plate including the first conductor part 21, the second conductor part 22 and the insulating part 23, and the cover plate 2 can be directly covered on the end face of the side wall 12. In the fifth embodiment, the annular positioning The portion 25 is in contact with the inner wall surface of the side wall 12 . In the present embodiment, the cover plate 2 is protruded with an annular positioning portion 25 facing the circular bottom plate 11 .

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present application, but these belong to the scope of the present application. protected range.

Claims

A button-type battery case, the button-type battery case includes a main shell and a cover plate, characterized in that the main shell is an electrical insulating shell with a accommodating cavity, the accommodating cavity is provided with an opening, and the cover plate a cover is arranged on the end of the opening and covers the accommodating cavity;

The cover plate includes a first conductor portion, a second conductor portion, and is provided between the first conductor portion and the second conductor portion for preventing the first conductor portion and the second conductor portion from being mutually a conductive insulating part, the insulating part has a first end face and a second end face opposite to each other, and both the first end face and the second end face face the side wall of the accommodating cavity, and the first conductor part The second conductor portion extends from the first end face in the direction of the side wall opposite to the first end face, and the second conductor portion extends from the second end face in the direction of the side wall opposite to the second end face extend.
The button-type battery case according to claim 1, wherein the main case comprises a circular bottom plate which is spaced apart from the cover plate and extends from the edge of the circular bottom plate toward the cover plate. The provided side wall, the cover plate is covered on the end surface of the side wall facing away from the circular bottom plate.
The button-type battery case according to claim 2, wherein the side wall comprises an annular support portion extending from the edge of the circular bottom plate toward the cover plate, and an annular support portion facing away from the annular support portion. The end surface of the circular bottom plate extends toward the cover plate with a protruding limiting portion, and the cover plate is covered on the end surface of the annular support portion facing away from the circular bottom plate and abuts against the limiting portion.
The button-type battery case according to claim 2, wherein the side wall comprises an annular support portion protruding from the circular bottom plate toward the cover plate, and an annular support portion facing away from the annular support portion. The end surface of the circular bottom plate extends and protrudes toward the cover plate with a protruding limit portion; the cover plate is protruded with an annular locking portion facing the side wall, and the annular locking portion extends from the direction of the cover plate. The surface of the side wall extends in a direction away from the central axis of the cover plate. All abut against the end face of the annular support portion.
The button-type battery case according to claim 2, wherein the cover plate is protruded with an annular positioning portion facing the circular bottom plate, and an end surface of the side wall facing away from the circular bottom plate is opened There is an annular groove that is snap-fitted with the annular positioning portion.
The button battery case according to claim 2, wherein the cover plate is protruded with an annular positioning portion facing the circular bottom plate, and the annular positioning portion abuts on the outer wall surface of the side wall or abuts against the inner wall surface of the side wall.
The button battery case according to claims 1 to 6, wherein the electrically insulating case is selected from any one of an insulating plastic case, an insulating ceramic case, and an insulating glass case.
The button battery case according to any one of claims 1 to 6, wherein the first conductor part and/or the second conductor part are both stainless steel blocks; the insulating part is polyether ether Ketone board or polyphthalamide board.
A button-type battery includes an outer shell with an accommodating cavity and a winding core accommodated in the accommodating cavity, wherein the outer shell is the button-type battery shell according to any one of claims 1 to 8, and the winding core includes A positive electrode sheet, a negative electrode sheet, and a separator arranged between the positive electrode sheet and the negative electrode sheet to prevent the positive electrode sheet and the negative electrode sheet from conducting with each other, and the positive electrode sheet is electrically connected to the first conductor part, the negative electrode piece is electrically connected to the second conductor part.
The button battery according to claim 9, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer coated and formed on the surface of the positive electrode current collector, and the positive electrode current collector is electrically connected to the first a conductor part, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer formed on the surface of the negative electrode current collector, the negative electrode current collector is electrically connected to the second conductor part; or/and,

The winding core further includes a positive electrode connection piece and a negative electrode connection piece, one end of the positive electrode connection piece is connected to the positive electrode piece, the other end is connected to the first conductor part, one end of the negative electrode connection piece is connected to the negative electrode piece, and the other end is connected to the negative electrode piece. The second conductor portion is connected.