CN215896542U

CN215896542U - Button cell assembly structure and button cell

Info

Publication number: CN215896542U
Application number: CN202121299846.1U
Authority: CN
Inventors: 梁瑾; 曹琳; 饶顺平; 陈杰; 项海标
Original assignee: Dongguan Lithium Microelectronics Technology Co ltd
Current assignee: Dongguan Lithium Microelectronics Technology Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-02-22
Anticipated expiration: 2031-06-10

Abstract

The utility model belongs to the technical field of battery production and manufacture, and particularly relates to an assembly structure of a button cell and the button cell, which comprise a shell (1) and a side wall (11); the cover plate (2) is fixedly connected with the shell (1); lateral wall (11) with the junction of apron (2) is provided with spacing portion (111), the edge of apron (2) be provided with spacing portion (111) complex breach portion (21), on length direction (X), the length of breach portion (21) is less than or equal to the thickness of lateral wall (11). The cover plate can be embedded into the shell, and the welding effect is improved.

Description

Button cell assembly structure and button cell

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to an assembly structure of a button cell and the button cell.

Background

With the development of portable electronic products, intelligent wearable products, medical instruments and the like, batteries are more miniaturized, so that a battery with small volume, high specific energy, good sealing property, small self-discharge and high reliability is developed, and the battery is commonly called a button battery due to the shape like a button. The button cell battery has various types, and the lithium ion button cell battery is one of the button cell batteries with the highest energy density and the highest working voltage, and can be widely applied if the difficulty in industrial manufacturing can be solved.

At present, the sealing mode of the button cell is mainly to reduce the upper and lower parts of the button cell through the closing mode of a die, namely, the shell is directly reduced, so that the cap and the shell are integrated, but the sealing mode also has the following defects: the battery energy is limited by the size of the cap, so the energy density is lower; the cap and the shell are combined together in a physical mode, the sealing performance is poor, and fatal risks such as liquid leakage are easy to occur.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: to prior art's not enough, provide a button cell's assembly structure, can be favorable to improving the welding effect with the apron embedding in the casing.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an assembling structure of a button cell comprises a shell, a connecting piece and a clamping piece, wherein the shell comprises a side wall; the cover plate is fixedly connected with the shell; the lateral wall with the junction of apron is provided with spacing portion, the edge of apron be provided with spacing portion complex breach portion, in length direction, the length of breach portion is less than or equal to the thickness of lateral wall.

Preferably, the side wall is at least partially fitted in the notch portion.

Preferably, in the height direction, the height of the limiting part is smaller than the thickness of the cover plate.

Preferably, the housing is fixedly connected to the cover plate by laser welding.

Preferably, the cross section of the limiting part is square, trapezoid, triangle or L-shaped.

Preferably, the housing is square, circular or oval in shape.

Preferably, the cover plate is provided with a hollow hole, a pole is installed in the hollow hole, and an insulating part is installed between the pole and the cover plate.

Preferably, the insulating member is made of one of polypropylene rubber, fluororubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene rubber, butyl rubber and curing glue.

Preferably, the apron is provided with annotates the liquid hole, annotate liquid hole dismantlement and install sealed nail, the casing is provided with explosion-proof nick.

The utility model also provides a button cell, which comprises a cell core; and the assembling structure of the button cell is characterized in that at least one end of the battery cell forms two tabs, one tab is fixed on the pole of the cover plate by welding, and the other tab passes through the inside of the welding shell.

The utility model has the advantages that the utility model comprises a shell, a shell body and a shell body, wherein the shell body comprises a side wall; the cover plate is fixedly connected with the shell; the lateral wall with the junction of apron is provided with spacing portion, the edge of apron be provided with spacing portion complex breach portion, in length direction, the length of breach portion is less than or equal to the thickness of lateral wall. The existing button cell sealing method is mainly characterized in that the upper part and the lower part of the button cell are closed by a die, namely, the shell is directly reduced, so that the cap and the shell are integrated, but the prior button cell sealing method has the following defects that the energy of the cell is limited by the size of the cap, so the energy density is lower; nut cap and casing are in the same place through the physical mode combination, its leakproofness is poor, fatal risks such as weeping appear easily, therefore, in casing and apron course of working, the lateral wall of casing is equipped with spacing portion with the junction of apron, form the structure of step, and the edge of apron is equipped with breach portion, spacing portion and the cooperation of breach portion, make the apron imbed into the casing, be convenient for fix a position at both welding process, and simultaneously, the shape of spacing portion and breach portion is mutually supported, and the size is mutually supported, make the face of weld of apron and casing be the horizontal direction, the face of weld is the horizontal direction, can get rid of the influence of gravity, can make the welding seam even, welding quality is good, promote the welding effect, in addition, this kind of structure can avoid because apron and casing contact have the gap, laser gets into inside the battery through the gap, burn out the condition of electric core. The cover plate can be embedded into the shell, and the welding effect is improved.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is an enlarged view of fig. 1 at a.

Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 4 is an enlarged view of fig. 1 at B.

Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 6 is an enlarged view of fig. 1 at C.

Fig. 7 is a schematic structural view of a fourth embodiment of the present invention.

Fig. 8 is an enlarged view of fig. 1 at D.

The reference numerals are explained below:

1-a shell; 11-a side wall; 111-a limiting part;

2-cover plate; 21-a notch portion; 20-pole column;

3-an insulator;

4-electric core; 41-pole ear;

x-length direction; z-height direction.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail with reference to fig. 1 to 8, but the present invention is not limited thereto.

Implementation mode one

The first embodiment will be described with reference to the accompanying drawings 1-2

The assembly structure of the button cell comprises a shell 1, a side wall 11; the cover plate 2 is fixedly connected with the shell 1; a limiting part 111 is arranged on one side of the side wall 11 close to the cover plate 2, a notch part 21 matched with the limiting part 111 is arranged on the edge of the cover plate 2, and the length of the notch part 21 is smaller than or equal to the thickness of the side wall 11 in the length direction X.

The existing button cell sealing method is mainly characterized in that the upper part and the lower part of the button cell are closed by a die, namely, the shell is directly reduced, so that the cap and the shell are integrated, but the prior button cell sealing method has the following defects that the energy of the cell is limited by the size of the cap, so the energy density is lower; the cap and the shell are combined together by a physical mode, the sealing performance is poor, and fatal risks such as liquid leakage and the like are easy to occur, therefore, in the processing process of the shell 1 and the cover plate 2, the connecting part of the side wall 11 of the shell 1 and the cover plate 2 is provided with a limiting part 111 to form a step structure, the edge of the cover plate 2 is provided with a notch part 21, the limiting part 111 is matched with the notch part 21, so that the cover plate 2 is embedded into the shell 1, the positioning is convenient in the welding process of the shell and the cover plate, meanwhile, the limiting part 111 is matched with the notch part 21 in shape and size, so that the welding surface of the cover plate 2 and the shell 1 is in the horizontal direction, the welding surface is in the horizontal direction, the influence of gravity can be eliminated, the welding seam can be uniform, the welding quality is good, the welding effect is improved, in addition, the structure can avoid that laser enters the interior of the battery through the seam due to the contact of the cover plate 2 and the shell 1, the situation of burning out the cell.

In the present embodiment, the length of the notch 21 in the longitudinal direction X is less than or equal to the thickness of the side wall 11, and the top of the side wall 11 directly provides a space for supporting the bottom edge of the cover plate 2, so that the bottom edge of the cover plate 2 and the side wall 11 are melted together after welding, which contributes to improving the welding effect. Specifically, lateral wall 11 and spacing portion 111 are integrated into one piece structure, and casing 1 still includes the bottom plate spare, can play the effect of supporting to adorning electric core 4 in casing 1, and when casing 1 was circular, can be formed by 11 integrative bodys of a lateral wall or the shaping of buckling, and when casing 1 was square, 4 consecutive lateral walls 11 set up around the bottom plate spare, and the bottom plate spare can be with each lateral wall 11 structure as an organic whole, satisfy and seal electric core 4 can. The housing 1 and the cover plate 2 are both made of metal materials.

In the assembly structure of the button cell according to the present invention, the height of the stopper 111 is smaller than the thickness of the cap plate 2 in the height direction Z. Specifically, the limiting part 111 extends from the top edge of the side wall 11 along the height direction Z, the height of the limiting part 111 is smaller than the thickness of the cover plate 2, the thickness of the cover plate 2 is larger, the cover plate 2 of the limiting part can block laser, and the situation that the laser enters the battery through the gap and burns out the battery core 4 due to the fact that the cover plate 2 is in contact with the casing 1 is avoided.

In the assembly structure of the button cell according to the present invention, the case 1 is fixedly coupled to the cap plate 2 by laser welding. Laser welding can be realized by adopting continuous or pulse laser beams, and the principle of laser welding can be divided into heat conduction type welding and laser deep melting welding; 2, the power density is less than 104-105W/cm, and the welding is heat conduction welding, wherein the fusion depth is shallow and the welding speed is slow; when the power density is more than 105-107W/cm 2, the metal surface is recessed into a 'hole' under the action of heat to form deep fusion welding, and the deep fusion welding has the characteristics of high welding speed and large depth-to-width ratio, wherein the heat conduction type laser welding principle is as follows: the laser radiation heats the surface to be processed, the surface heat is diffused inwards through heat conduction, the workpiece is melted to form a specific molten pool by controlling laser parameters such as the width, energy, peak power, repetition frequency and the like of laser pulses, and laser welding is preferably adopted, but the utility model is not limited to this, and other welding modes can also be adopted, so that the shell 1 and the cover plate 2 can be fixedly connected.

In the assembly structure of the button cell according to the present invention, the cross-section of the stopper 111 is square. Specifically, the inboard of the spacing portion 111 of square contacts with the outside of apron 2, the outside of spacing portion 111 exposes outside, the edge of apron 2 is provided with the spacing portion 111 complex breach portion 21 of square, the top of the spacing portion 111 of square is planar structure, with the bottom edge contact of apron 2, when the welding, the face of weld of apron 2 and casing 1 is the horizontal direction, the welding seam also is the horizontal direction, can get rid of the influence of gravity, can make the welding seam even, the welding quality is good, promote the welding effect.

In the assembly structure of the button cell according to the utility model, the shape of the casing 1 is square, circular or oval. The shape of the housing 1 can be designed to be square, circular, oval or irregular according to actual production requirements and cost requirements.

In the assembling structure of the button cell, the cover plate 2 is provided with a hollowed hole, the pole 20 is installed in the hollowed hole, and the insulating part 3 is installed between the pole 20 and the cover plate 2. Specifically, the cover plate 2 may be circular, and the insulator 3 and the cover plate 2 may be concentrically arranged to form a hollow hole, including but not limited to a square, a circle, an oval, a special-shaped structure, and the like, and the hole may be in different positions.

The working principle of the utility model is as follows:

in

casing

1 and 2 course of working of apron, casing 1's lateral wall 11 is equipped with spacing portion 111 with the junction of apron 2, form the structure of step, and apron 2's edge is equipped with breach portion 21, spacing portion 111 and the cooperation of breach portion 21, make apron 2 imbed in casing 1, be convenient for fix a position at both welding processes, and simultaneously, spacing portion 111 and the shape of breach portion 21 mutually support, and the size is mutually supported, make apron 2 and casing 1's face of weld be the horizontal direction, the face of weld is the horizontal direction, can get rid of the influence of gravity, can make the welding seam even, the welding quality is good, promote the welding effect, furthermore, this kind of structure can avoid because apron 2 and casing 1 contact have the gap, inside laser gets into the battery through the gap, burn out the condition of electric core 4.

Second embodiment

The difference from the first embodiment is that: the cross section of the limiting part 111 of the present embodiment is trapezoidal, and the material of the insulating member 3 is one of polypropylene rubber, fluorine rubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation rubber, ethylene propylene rubber, butyl rubber and curing rubber. Specifically, the cross-section of spacing portion 111 is trapezoidal, preferably adopt right trapezoid, can also be the trapezoidal of other structures, the inboard of trapezoidal spacing portion 111 and the outside contact of apron 2, the outside of spacing portion 111 exposes outside, the edge of apron 2 is provided with trapezoidal spacing portion 111 complex breach portion 21, the top of trapezoidal spacing portion 111 is planar structure, bottom edge contact with apron 2, when the welding, the face of weld of apron 2 and casing 1 is the horizontal direction, the welding seam also is the horizontal direction, can get rid of the influence of gravity, can make the welding seam even, welding quality is good, promote the welding effect. Wherein, according to the requirement of actual cost, one of polypropylene rubber, fluorine rubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation rubber, ethylene propylene rubber, butyl rubber and curing rubber can be used as the material of the insulating part 3.

Other structures are the same as those of the first embodiment, and are not described herein again.

Third embodiment

The difference from the first embodiment is that: the stopper 111 of the present embodiment has a triangular cross section, the side wall 11 is at least partially fitted in the notch 21, and the housing 1 is provided with an explosion-proof notch. Specifically, the preferred right-angled triangle in spacing portion 111's cross-section, also can be other triangle-shaped shapes, the inboard of the spacing portion 111 of triangle-shaped, the hypotenuse contacts with the outside of apron 2 promptly, spacing portion 111's the outside, the right-angled side exposes outside promptly, when the welding, the face of weld of apron 2 and casing 1 is the horizontal direction, the welding seam is also the horizontal direction, can get rid of the influence of gravity, can make the welding seam even, welding quality is good, promote the welding effect, in addition, lateral wall 11 at least part inlays in breach portion 21, can increase the area of contact of lateral wall 11 and apron 2 bottom, help improving lateral wall 11 and apron 2's steadiness. The anti-explosion nicks are arranged inside or outside the bottom surface of the shell 1 and are etched by laser, and the nicks can be broken under the preset internal pressure, so that the safety of the battery is ensured, the anti-explosion lines are broken when the battery is abused to generate a large amount of gas, the pressure is released in time, and further runaway of the battery is prevented, and accidents such as fire, explosion and the like which seriously affect the safety are generated.

Embodiment IV

The difference from the first embodiment is that: the stopper 111 of the present embodiment has a square cross section, the side wall 11 is at least partially fitted in the notch 21, and the lid plate 2 is provided with a liquid injection hole to which a seal nail is detachably attached. Specifically, the inner side of the square limiting part 111 is in contact with the outer side of the cover plate 2, the outer side of the limiting part 111 is exposed outside, the edge of the cover plate 2 is provided with a notch part 21 matched with the square limiting part 111, the top of the square limiting part 111 is of a plane structure and is in contact with the edge of the bottom of the cover plate 2, when welding is carried out, the welding surface of the cover plate 2 and the shell 1 is in the horizontal direction, the welding seam is also in the horizontal direction, the influence of gravity can be eliminated, the welding seam can be uniform, the welding quality is good, and the welding effect is improved; in addition, the side wall 11 is at least partially fitted in the notch portion 21, which can increase the contact area between the side wall 11 and the bottom of the cover 2, and contribute to improving the stability of the side wall 11 and the cover 2. Annotate the liquid hole and seal with sealed nail after annotating the liquid, remove sealed nail after the formation, the exhaust adopts laser welding to weld circular shape stainless steel sheet on annotating the liquid hole, and sealed notes liquid hole perhaps with the extrusion mode, extrudees into the steel column of suitable size and annotates the liquid hole, then scribbles UV glue around the steel ball, requires the steel column external diameter directly to be greater than the external diameter of annotating the liquid hole.

Button cell

The present invention includes an assembly structure of button cell batteries of the first to fourth embodiments, including: a battery cell 4; and as the above assembling structure of the button cell, at least one end of the battery cell 4 forms two tabs 41, wherein one tab 41 is fixed on the pole 20 of the cover plate 2 by welding, and the other tab 41 is welded inside the casing 1.

It should be noted that: positive and negative pole pieces, the isolating film forms the electric core 4 by winding or lamination, and positive and negative pole lugs are led out from the same end or different ends of the electric core 4; the positive and negative electrode tabs are respectively an aluminum strip and a copper nickel plating strip (copper strip and nickel strip), and the tab 41 is welded on the empty foil of the corresponding pole piece by adopting an ultrasonic welding mode; the positive pole lug of the battery cell 4 is welded on the cover plate through ultrasonic welding, resistance welding or laser welding, the material is one of aluminum, nickel and stainless steel, and the negative pole is directly welded inside the shell 1 through resistance welding or laser welding. And insulating the non-welding points of the aluminum strip by a processing method including but not limited to hot-pressing PP glue, pasting insulating gummed paper, coating insulating gummed water and the like.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. An assembly structure of button cell batteries, characterized by comprising:

a housing (1) comprising a side wall (11);

the cover plate (2) is fixedly connected with the shell (1);

lateral wall (11) with the junction of apron (2) is provided with spacing portion (111), the edge of apron (2) be provided with spacing portion (111) complex breach portion (21), on length direction (X), the length of breach portion (21) is less than or equal to the thickness of lateral wall (11).

2. A button cell battery assembling structure as defined in claim 1, wherein: the side wall (11) is at least partially fitted in the notch portion (21).

3. A button cell battery assembling structure as defined in claim 1, wherein: in the height direction (Z), the height of the limiting part (111) is smaller than the thickness of the cover plate (2).

4. A button cell battery assembling structure as defined in claim 1, wherein: the shell (1) is fixedly connected with the cover plate (2) through laser welding.

5. A button cell battery assembling structure as defined in claim 1, wherein: the cross section of the limiting part (111) is square, trapezoid, triangle or L-shaped.

6. A button cell battery assembling structure as defined in claim 1, wherein: the shape of the shell (1) is square, round or oval.

7. A button cell battery assembling structure as defined in claim 1, wherein: the novel electric pole is characterized in that the cover plate (2) is provided with hollowed holes, pole columns (20) are installed in the hollowed holes, and the insulating parts (3) are installed between the pole columns (20) and the cover plate (2).

8. A button cell battery assembling structure, as recited in claim 7, wherein: the insulating part (3) is made of one of polypropylene rubber, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene rubber, butyl rubber and curing glue.

9. A button cell battery assembling structure as defined in claim 1, wherein: the cover plate (2) is provided with a liquid injection hole, the liquid injection hole is detachably provided with a sealing nail, and the shell (1) is provided with an explosion-proof nick.

10. A button cell battery, comprising:

an electric core (4); and

the assembling structure of button cell according to any of claims 1-9, wherein at least one end of the battery cell (4) forms two tabs (41), one of the tabs (41) is fixed on the pole (20) of the cover plate (2) by welding, and the other tab (41) is welded inside the casing (1).