CN111755633A

CN111755633A - Button cell

Info

Publication number: CN111755633A
Application number: CN202010662006.0A
Authority: CN
Inventors: 张健; 何家勇; 徐斌
Original assignee: Ruisheng Technology Nanjing Co Ltd
Current assignee: AAC Technologies Holdings Nanjing Co Ltd; Ruisheng Technology Nanjing Co Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2020-10-09
Anticipated expiration: 2040-07-10
Also published as: CN111755633B; WO2022007031A1

Abstract

The invention provides a button cell, which comprises a bottom shell and a surrounding wall bent and extended from the periphery of the bottom shell, wherein a cover body comprises a first shell body right opposite to the bottom wall, a second shell body abutted against the surrounding wall and an insulating part for connecting the first shell body and the second shell body; the second shell comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part which are connected in sequence. Through set up first connecting portion, second connecting portion, third connecting portion and fourth connecting portion on the second casing once, first connection is connected with the insulating part, the second connecting portion extends to keeping away from the diapire direction, the third connecting portion extend on a parallel with the diapire, the fourth connecting portion extends to being close to the diapire direction, the outer side portion and the laminating of the two connecting portion of fourth of leg tip and electric connection portion butt and leg, the tip fixed connection of third connecting portion and leg for can not destroy the battery body because of the casing deformation that high temperature leads to in welding process.

Description

Button cell

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of energy storage devices, in particular to a button battery.

[ background of the invention ]

In the process of welding the cover and the bottom case of the battery, the battery body is easily damaged because the welded and fixed part is very close to the battery body in the case.

Therefore, it is necessary to provide a button cell with a new structure to solve the above problems.

[ summary of the invention ]

The invention aims to provide a button cell which can not damage a cell body through the fixing operation of a shell.

The technical scheme of the invention is as follows:

a button battery comprises a bottom shell with an accommodating space, a battery body arranged in the accommodating space, and a cover body connected with the bottom shell, wherein the bottom shell comprises a bottom wall and a surrounding wall bent and extended from the periphery of the bottom wall, and the cover body comprises a first shell body right opposite to the bottom wall, a second shell body abutted against the surrounding wall, and an insulating part connected with the first shell body and the second shell body; the second shell comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part which are sequentially connected, the first connecting part is connected with the insulating part, the second connecting part extends from the periphery of the first connecting part to the direction far away from the bottom wall, the third connecting part extends in parallel with the bottom wall, the fourth connecting part extends from the periphery of the third connecting part to the direction close to the bottom wall, the end part of the surrounding wall is abutted against the third connecting part, and the outer side part of the surrounding wall is attached to the fourth connecting part; the third connecting part is fixedly connected with the end part of the surrounding wall.

Optionally, the peripheral wall is provided with at least one opening, a sealing element covers the opening, the sealing element abuts against the fourth connecting portion, and the cover, the sealing element and the bottom case form a sealing structure; wherein the sealing member is capable of melting at a set temperature, so that the substance in the accommodating space can enter the outside of the bottom case through the opening.

Optionally, the sealing member is an annular member, and the sealing member surrounds and covers the opening, the connection between the bottom case and the cover body.

Optionally, the sealing member has a thickness that gradually decreases from an end close to the cover to an end away from the cover.

Optionally, the first case is connected to one electrode of the battery body, and the bottom wall is connected to the other electrode of the battery body.

Optionally, a conductive member is further connected between the first casing and the electrode of the battery body, a conductive member is also connected between the bottom wall and the electrode of the battery body, and the conductive member is used for extending contact areas of the electrode, the first casing and the bottom wall.

Optionally, the cross section of insulating part is "worker" font structure, including first joint portion and second joint portion, first joint portion with first connecting portion joint, second joint portion with first casing joint.

Optionally, the third connecting portion and the end of the surrounding wall are welded and fixed, and the welding point is located at the third connecting portion.

Optionally, a plurality of pits are formed in the third connecting portion, and the pits are used for welding and positioning.

Optionally, the first housing is a disc-shaped structure with a flange edge, and the first housing is clamped with the second clamping portion through the flange edge.

The invention has the beneficial effects that: through extending the second connecting portion on the second casing to keeping away from the diapire direction, the third connecting portion extend parallel to the diapire, and the fourth connecting portion extend in order to form the fixed space of keeping away from the battery body to being close to the diapire direction to with the tip fixed connection of third connecting portion and leg, make can not destroy the battery body at casing welded fastening process.

[ description of the drawings ]

FIG. 1 is a schematic view of an embodiment of a battery having a protection function according to the present invention;

fig. 2 is a front view of the battery having a protection function of fig. 1;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a partial view at B of FIG. 3;

FIG. 5 is a schematic view of an embodiment of a bottom case of a battery with protection function according to the present invention;

FIG. 6 is a schematic view of one embodiment of a seal member in a battery having a protection function according to the present invention;

FIG. 7 is a schematic view of an embodiment of a second housing of the battery with protection of the present invention;

FIG. 8 is a cross-sectional view taken at C-C of FIG. 7;

FIG. 9 is a partial view taken at D of FIG. 8;

fig. 10 is a schematic view of an embodiment of an insulating member in a battery having a protection function according to the present invention;

FIG. 11 is a cross-sectional view taken at E-E of FIG. 10;

fig. 12 is a schematic view of an embodiment of a first case of the battery with protection function according to the present invention;

fig. 13 is a sectional view at the first housing F-F in fig. 12.

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments.

Referring to fig. 1 to 4, the battery with a protection function includes a bottom case 10 having an accommodating space, a battery body 20 disposed in the accommodating space of the bottom case 10, the battery body 20 being used for storing or outputting electric energy, and a cover 30, the cover 30 being covered on the bottom case 10. The bottom shell 10 comprises a bottom wall 11 and a surrounding wall 12 bent and extended from the periphery of the bottom wall 11, and the cover 30 comprises a first shell 33 opposite to the bottom wall 11, a second shell 31 abutted against the surrounding wall 12, and an insulating member 32 connecting the first shell 33 and the second shell 31; the second housing 31 includes a first connection portion 312, a second connection portion 313, a third connection portion 314 and a fourth connection portion 315 connected in sequence, the first connection portion 312 is connected to the insulating member 32, the second connection portion 322 extends from the periphery of the first connection portion in the direction away from the bottom wall 11, the third connection portion 314 extends parallel to the bottom wall 11, the fourth connection portion 315 extends from the periphery of the third connection portion in the direction close to the bottom wall 11, the end of the surrounding wall is abutted to the third connection portion 314, and the outer side of the surrounding wall is abutted to the fourth connection portion 315; the third connecting portion 314 is fixedly connected to the end of the surrounding wall 12. So that the battery body is not damaged when the battery is welded and connected.

At least one opening 121 has been seted up to the leg 12, and the outside of opening 121 covers has sealing member 40 to sealing member 40 and fourth connecting portion 315 butt, lid 30, sealing member 40 and drain pan 10 form seal structure, and inside separation interference gas, water etc. got into the battery, guarantee battery job stabilization nature and reliability. More, the sealing member 40 can be melted at a predetermined temperature, so that the substance in the accommodating space 11 can enter the outside of the bottom case 10 through the opening 12, thereby avoiding the problem of high temperature burn or explosion caused by the increase of the internal temperature and volume of the battery and the increase of the internal air pressure of the battery.

Preferably, the sealing member 40 is a ring-shaped member, and the sealing member 40 surrounds the opening 12 and the connection between the bottom case 10 and the cover 30, so that a reliable sealing structure is formed between the cover 30 and the bottom case 10. Further, the thickness of the sealing member 40 is gradually reduced from the end close to the lid 30 to the end far away from the lid 30, so that the connection between the lid 30 and the bottom case 10 is in smooth transition, on one hand, the connection between the lid 30 and the bottom case 10 is in smooth transition through the sealing member 40, and the connection between the lid 30, the sealing member 40 and the bottom case 10 has good integrity, and on the other hand, when the internal pressure or temperature of the battery exceeds a nominal value, the thickness of the end of the sealing member 40 close to the opening 21 is thinner, so that a quick response can be achieved, the internal pressure and temperature of the bottom case 10 are prevented from being too high, and the safety of the battery in the.

Preferably, a conductive member 50 is further connected between the second casing 31 and the electrode of the battery body 20, a conductive member 50 is further connected between the first casing 33 and the electrode of the battery body 20, and the conductive member 50 is used for extending the contact area between the electrode 21 and the bottom wall 11 and between the electrode and the first casing 33, so that both the bottom wall 11 and the first casing 33 can be in sufficient contact with the electrode 21 on the battery body 20, and the performance of the battery is guaranteed.

Preferably, the third connection part 314 and the bottom case 10 are connected as an integral structure through a laser welding process.

Preferably, the cover 30 is integrally formed by stamping, and has a simple manufacturing process and good product consistency.

Referring to fig. 10 and 11, the insulating member 32 is in an "i" shape and includes a first clamping portion 321 and a second clamping portion 322, the first clamping portion 321 is clamped with the first connecting portion 312, the second clamping portion 322 is clamped with the first housing 33, and the bottom end of the insulating member 32 abuts against the battery body 20, so as to press the battery body 20 in the bottom case 10, and prevent the battery body 20 from moving in the bottom case 10 in a direction perpendicular to the bottom case 10.

Preferably, the third connecting portion 314 is provided with a plurality of recesses 3111, and the lid 30 and the bottom case 10 are connected to each other by welding in the recesses 3111 to form an integral structure. Pit 3111 is located the top surface of lid 30, and the operator's of being convenient for location operation in welding process can also ensure the uniformity of lid 30 and drain pan 10 welding department solder joint simultaneously for lid 30 surface after the welding is accomplished still has good uniformity, the characteristic of guarantee battery facilitate the use.

Preferably, the connection portion of the battery body 20 and the insulator 32 is a depressed plane 23 so that the first case 33 and the second case 31 are relatively distant from the battery body 20.

Referring to fig. 12 and 13, the first housing 33 has a disk-shaped structure with a flange 331, the first housing 33 is clamped with the second clamping portion 322 by the flange 331, the concave portion of the first housing 33 abuts against the conductive member 50, and the conductive member 50 abuts against the battery body 20.

Referring to fig. 5, bottom shell 10 is hollow cylinder shape as a whole, and there are 4 openings 11 at the lateral part evenly distributed of bottom shell 10, and opening 11 is used for the pressure release, can prevent that the battery from being in the safe atmospheric pressure scope all the time through setting up opening 11 and making the inside atmospheric pressure of battery be in safe atmospheric pressure scope after the increase of battery internal pressure under the circumstances such as charging and discharging, ensures the fail safe nature in the battery use.

Referring to fig. 6, the sealing member 40 is a conical ring, and is disposed on the opening 11 of the bottom case 10 for sealing the opening 11 and sealing the connection between the lid 30 and the bottom case 10. Specifically, the sealing member 40 has a tapered structure outside and a cylindrical hole inside, and is sleeved on the bottom case 10, and the elastic deformation of the sealing member 40 tightly seals the joint between the lid 30 and the bottom case 10, thereby ensuring the sealing performance at the joint between the lid 30 and the bottom case 10. In another embodiment, the outer side of the sealing element 40 is a tapered structure, so that the lower portion of the connection portion between the sealing element 40 and the cover 30 has a larger elastic deformation amount than the upper portion of the sealing element 40, and further the lower portion of the sealing element 40 has a larger pre-tightening force than the upper portion abutting against the cover 30, thereby preventing the sealing element 40 from falling off from the bottom case 10 and ensuring the connection reliability of the sealing element 40.

Referring to fig. 7 to 9, the second housing 31 has an overall annular structure, and a through hole 313 is formed in a middle portion of the second housing 31, and the through hole 313 is used for accommodating the insulating member 32 and the first housing 33.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. A button cell is characterized in that: the battery pack comprises a bottom shell with an accommodating space, a battery body arranged in the accommodating space and a cover body connected with the bottom shell, wherein the bottom shell comprises a bottom wall and a surrounding wall bent and extended from the periphery of the bottom wall, and the cover body comprises a first shell body right opposite to the bottom wall, a second shell body abutted against the surrounding wall and an insulating part connected with the first shell body and the second shell body;

the second shell comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part which are sequentially connected, the first connecting part is connected with the insulating part, the second connecting part extends from the periphery of the first connecting part to the direction far away from the bottom wall, the third connecting part extends in parallel with the bottom wall, the fourth connecting part extends from the periphery of the third connecting part to the direction close to the bottom wall, the end part of the surrounding wall is abutted against the third connecting part, and the outer side part of the surrounding wall is attached to the fourth connecting part;

the third connecting part is fixedly connected with the end part of the surrounding wall.

2. The button cell of claim 1, wherein: the peripheral wall is provided with at least one opening, a sealing element covers the outside of the opening, the sealing element is abutted against the fourth connecting part, and the cover body, the sealing element and the bottom shell form a sealing structure;

wherein the sealing member is capable of melting at a set temperature, so that the substance in the accommodating space can enter the outside of the bottom case through the opening.

3. The button cell of claim 2, wherein: the sealing element is an annular component and is wrapped around the opening and the joint of the bottom shell and the cover body.

4. The button cell of claim 3, wherein: the sealing element gradually reduces in thickness from the end close to the cover body to the end far away from the cover body.

5. The button cell of claim 1, wherein: the first case is connected to one electrode of the battery body, and the bottom wall is connected to the other electrode of the battery body.

6. The button cell of claim 5, wherein: and a conductive piece is also connected between the first shell and the electrode of the battery body, a conductive piece is also connected between the bottom wall and the electrode of the battery body, and the conductive piece is used for extending the contact area of the electrode with the first shell and the bottom wall.

7. The button cell of claim 1, wherein: the cross section of insulating part is "worker" font structure, including first joint portion and second joint portion, first joint portion with first connecting portion joint, second joint portion with first casing joint.

8. The button cell of claim 1, wherein: the third connecting portion with the tip welded fastening of leg, the welding point is located the third connecting portion.

9. The button cell of claim 8, wherein: and a plurality of pits are arranged on the third connecting part and used for welding and positioning.

10. The button cell of claim 7, wherein: the first shell is of a disc-shaped structure with a flange edge, and the first shell is clamped with the second clamping portion through the flange edge.