CN215896629U

CN215896629U - Button cell structure

Info

Publication number: CN215896629U
Application number: CN202121374699.XU
Authority: CN
Inventors: 刘双飞; 王传宝; 曹琳; 乐红春; 余志�
Original assignee: Dongguan Lithium Microelectronics Technology Co ltd
Current assignee: Dongguan Lithium Microelectronics Technology Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-02-22
Anticipated expiration: 2031-06-21

Abstract

The utility model belongs to the technical field of battery production and manufacture, and particularly relates to a button cell structure which comprises a shell, a battery cover and a battery cover, wherein the shell is provided with an opening; a cover plate installed at the opening; the battery cell is accommodated in the shell, and at least two lugs with different polarities are arranged on the same side of the battery cell; the at least one tab comprises a body part and a bent part connected with the body part; one surface of the body part is parallel to a pole piece of the battery cell, and the other surface of the body part is attached to the side wall of the shell; the bending part is connected with the pole piece of the battery cell and is bent to preset an angle, and the body part is arranged between the pole piece of the battery cell and the side wall of the shell. The utility model is beneficial to optimizing the space of the height of the battery and improving the space utilization rate inside the battery by arranging the pole lugs on the side wall of the shell.

Description

Button cell structure

Technical Field

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

Background

Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. The button cell is also called as button cell, which refers to a cell with the overall dimension like a small button, generally speaking, the diameter is larger, the thickness is thinner, the button cell is classified from the appearance, and the same corresponding cell is classified into a columnar cell, a square cell and a special-shaped cell. Button cells generally include a cover plate and a steel can.

In the existing button cell structure, the tab is connected with the bottom of the shell or the cover plate, and the insulating adhesive tape of the tab occupies a larger space in the height of the cell, so that the overall height of the cell needs to be reduced, and the improvement of the space utilization rate inside the cell is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: the button cell structure is provided aiming at the defects of the prior art, and helps to optimize the space of the height of the cell and improve the space utilization rate of the interior of the cell by installing the pole lugs on the side wall of the shell.

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

a button cell structure comprises a shell provided with an opening; a cover plate installed at the opening; the battery cell is accommodated in the shell, and at least two lugs with different polarities are arranged on the same side of the battery cell; the at least one tab comprises a body part and a bent part connected with the body part; one surface of the body part is parallel to a pole piece of the battery cell, and the other surface of the body part is attached to the side wall of the shell; the bending part is connected with the pole piece of the battery cell and is bent to preset an angle, and the body part is arranged between the pole piece of the battery cell and the side wall of the shell.

Preferably, the tab is fixedly connected with the side wall of the shell by welding, and the welding mode is laser welding or double-needle resistance welding.

Preferably, the cover plate is provided with a pole, at least one pole lug is fixedly connected with the pole through welding, and the welding mode is ultrasonic welding, resistance welding or laser welding.

Preferably, the tab is an aluminum strip, a copper strip, a nickel strip or a copper nickel-plating strip, and the tab is welded on the tab of the battery cell through ultrasonic welding.

Preferably, the battery cell includes a first pole piece, a diaphragm, and a second pole piece having a polarity different from that of the first pole piece, the diaphragm, and the second pole piece are wound to form the battery cell, the tab is formed on the same side or different sides of the first pole piece and the second pole piece, and both the first pole piece and the second pole piece are perpendicular to the bottom of the casing.

Preferably, at least one of the housing and the cover plate is provided with a step, the cover plate is embedded in the housing, the housing is provided with a liquid injection hole, and a sealing element is installed on the outer side of the liquid injection hole.

Preferably, the cover plate is provided with a hollowed hole, the pole is installed in the hollowed hole, an insulating part is arranged on the inner wall of the hollowed hole, and the pole is fixed in the hollowed hole through riveting.

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

Preferably, the shell comprises a side wall and a bottom wall, the side wall and the bottom wall enclose a container, and explosion-proof lines are arranged on the inner side or the outer side of the side wall.

Preferably, the side wall or the bottom surface of the cover plate is provided with an insulating layer.

The utility model has the beneficial effects that the utility model comprises a shell which is provided with an opening; a cover plate installed at the opening; the battery cell is accommodated in the shell, and at least two lugs with different polarities are arranged on the same side of the battery cell; the at least one tab comprises a body part and a bent part connected with the body part; one surface of the body part is parallel to a pole piece of the battery cell, and the other surface of the body part is attached to the side wall of the shell; the bending part is connected with the pole piece of the battery cell and is bent to preset an angle, and the body part is arranged between the pole piece of the battery cell and the side wall of the shell. In the existing button cell structure, the pole ear is connected with the bottom of the shell or the cover plate, the insulation adhesive tape of the pole ear occupies larger space in the height of the cell, the whole height of the cell needs to be reduced, which is not beneficial to improving the space utilization rate in the cell, therefore, arranging at least two lugs with different polarities on the same side of the battery core, bending one lug for 90 degrees, so that the body part is parallel to the pole piece of the battery cell and the body part is attached to the inside of the side wall of the shell, then the body part and the shell are welded to realize the electric connection between the pole ear and the shell, compared with the prior battery structure, because the pole ear and the related insulation component are arranged on the side wall, the space occupied by the insulation glue of the pole ear at the height of the battery cell can be utilized, under the condition that the internal space of the battery is not changed, the internal space of the battery is optimized, the overall height of the battery core is improved, and therefore the energy density of the battery is improved. The utility model is beneficial to optimizing the space of the height of the battery and improving the space utilization rate inside the battery by arranging the pole lugs on the side wall of the shell.

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 exploded view of a cover plate according to a second embodiment of the present invention.

Fig. 3 is a schematic view of a case of a cover plate and the cover plate of a third embodiment of the present invention before welding.

Wherein the reference numerals are as follows:

1-a shell; 11-opening; 12-liquid injection hole; 13-a side wall; 14-a bottom wall; 121-a seal; 131-explosion-proof lines;

2-cover plate; 20-pole column; 21-hollowed holes; 22-an insulator;

3-electric core; 30-pole ear; 301-a body portion; 302-a bending part; 31-a first pole piece; 32-a second pole piece; 33-a membrane;

4-step.

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 3, but the present invention is not limited thereto.

Implementation mode one

The following describes embodiment one with reference to fig. 1

The button cell structure comprises a shell 1 provided with an opening 11; a cover plate 2 mounted on the opening 11; the battery cell 3 is accommodated in the shell 1, and at least two tabs 30 with different polarities are arranged on the same side of the battery cell 3; at least one tab 30 comprises a body part 301 and a bending part 302 connected with the body part 301; one surface of the body part 301 is parallel to the pole piece of the battery cell 3, so that the other surface of the body part 301 is attached to the side wall 13 of the casing 1; the bending portion 302 is connected to the pole piece of the battery cell 3 and is bent by a predetermined angle, so as to establish the body portion 301 between the pole piece of the battery cell 3 and the side wall 13 of the casing 1.

In the existing button cell structure, the tab is connected with the bottom or cover plate of the casing, the insulating adhesive tape of the tab occupies a larger space within the height of the cell, the overall height of the cell 3 needs to be reduced, which is not beneficial to improving the space utilization rate inside the cell, therefore, at least two tabs 30 with different polarities are arranged on the same side of the cell 3, one tab 30 is bent by 90 degrees, so that the body part 301 is parallel to the pole piece of the cell 3, and the body part 301 is attached to the inside of the side wall 13 of the casing 1, then the body part 301 is welded with the casing 1, so as to realize the electric connection between the tab 30 and the casing 1, compared with the existing cell structure, because the tab 30 and the related insulating components are both arranged on the side wall 13, the space occupied by the insulating adhesive of the tab 30 at the height of the cell 3 can be utilized, under the condition that the internal space of the cell is unchanged, the internal space of the cell is optimized, which is beneficial to improving the overall height of the cell 3, thereby improving the energy density of the battery.

Specifically, the battery cell 3 includes a first pole piece 31, a diaphragm 33 and a second pole piece 32 with different polarities from the first pole piece 31, that is, the positive pole piece, the negative pole piece and the diaphragm 33 are isolated from each other to assemble the battery cell 3 into a case, at least one tab 30 of the negative pole piece or the positive pole piece is bent by 90 degrees to be attached to the side wall 13 of the battery cell 3 formed by the winding, and is parallel to the pole pieces, the tab 30 parallel to the pole pieces can be attached to the side wall 13 inside the casing 1, and the tab 30 is welded outside the casing 1 by using laser or double-pin resistance welding at the position corresponding to the casing 1, so that the thickness space of the insulating tape of the tab can be utilized to the battery cell 3 formed by the winding in the battery height space.

In the button cell structure according to the present invention, the tab 30 is fixedly coupled to the side wall 13 of the case 1 by welding, which is laser welding or two-pin resistance welding. Specifically, the lug 30 is welded outside the shell 1 by using laser or double-needle resistance welding at a position corresponding to the shell 1, and when double-needle resistance welding is adopted, automatic up-and-down movement can be realized through two groups of spot welding electrodes so as to perform spot welding on a workpiece, so that the automation degree is high, the working efficiency is high, more labor cost can be saved, and the labor intensity is reduced; meanwhile, the double-needle resistance welding is convenient for positioning the electrode, can protect the electrode from being in a vertical state, avoids bending and further improves the processing precision.

In the button cell structure according to the utility model, the cover plate 2 is provided with a pole post 20, and at least one tab 30 is fixedly connected with the pole post 20 by welding in a mode of ultrasonic welding, resistance welding or laser welding. The pole 20 and the cover plate 2 are connected in an insulating mode through the insulating part 22, the other pole lug 30 with different polarities is electrically connected with the pole 20, the welding mode includes but is not limited to ultrasonic welding, resistance welding or laser welding, the material of the pole 30 can be matched with the material of the pole piece which is electrically connected with the pole lug, and the pole 30 can be made of one of aluminum, nickel and stainless steel.

In the button cell structure according to the present invention, the tab 30 is an aluminum tape, a copper tape, a nickel tape or a copper nickel plating tape, and the tab 30 is welded to the tab of the cell 3 by ultrasonic welding. Specifically, the tab 30 includes a positive tab and a negative tab, and can be welded on the empty foil of the corresponding pole piece through ultrasonic welding, and according to actual production requirements, an aluminum strip, a copper strip, a nickel strip or a copper nickel-plated strip can be used as the tab 30.

In the button cell structure according to the present invention, the non-welding point of the tab 30 is also insulated by, but not limited to, thermal compression bonding PP glue, pasting insulating adhesive paper, coating insulating adhesive, etc.

In the button cell structure according to the present invention, the battery cell 3 includes a first pole piece 31, a diaphragm 33, and a second pole piece 32 having a different polarity from that of the first pole piece 31, the diaphragm 33, and the second pole piece 32 are wound to form the battery cell 3, the tab 30 is formed on the same side or different sides of the first pole piece 31 and the second pole piece 32, and both the first pole piece 31 and the second pole piece 32 are perpendicular to the bottom of the casing 1. Specifically, first pole piece 31 and second pole piece 32 can be positive plate and negative pole piece, the positive plate, the negative pole piece, diaphragm 33 three separates into unitized electric core 3 each other, utmost point ear 30 can be drawn forth from the one end or both ends of electric core 3, and simultaneously, first pole piece 31 and the equal perpendicular to casing 1's of second pole piece 32 bottom, make anodal utmost point ear or negative pole utmost point ear buckle 90 and can laminate with winding shaping electric core 3's lateral wall 13, and parallel with the pole piece, in battery height space, with the thickness space of the insulating tape of utmost point ear, utilize on winding shaping electric core 3.

The shape of the battery includes, but is not limited to, square, circular, oval, irregular, etc., and circular is preferred.

The working principle of the utility model is as follows:

in the existing button cell structure, the tab is connected with the bottom or cover plate of the casing, the insulating adhesive tape of the tab occupies a larger space within the height of the cell, the overall height of the cell needs to be reduced, which is not beneficial to improving the space utilization rate inside the cell, therefore, at least two tabs 30 with different polarities are arranged on the same side of the cell 3, one tab 30 is bent by 90 degrees, so that the body part 301 is parallel to the pole piece of the cell 3, and the body part 301 is attached to the inside of the side wall 13 of the casing 1, then the body part 301 is welded with the casing 1, so as to realize the electric connection between the tab 30 and the casing 1, compared with the existing cell structure, because the tab 30 and the related insulating components are both arranged on the side wall 13, the space occupied by the insulating adhesive of the tab 30 at the height of the cell 3 can be utilized, under the condition that the internal space of the cell is unchanged, the internal space of the cell is optimized, which is beneficial to improving the overall height of the cell 3, thereby improving the energy density of the battery.

Second embodiment

The difference from the first embodiment is that: the cover plate 2 of the embodiment is provided with a hollow hole 21, the pole 20 is installed in the hollow hole 21, the inner wall of the hollow hole 21 is provided with an insulating part 22, the pole 20 is fixed in the hollow hole 21 through riveting, and the insulating part 22 is made of polypropylene rubber, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene rubber, butyl rubber and curing glue. Specifically, the insulating part 22 is compounded on the hollowed-out hole 21 in a compounding mode, a mounting hole is reserved for the pole 20, the insulating part 22 can have a good bonding effect with the metal cover plate 2, the pole 20 can adopt a rivet, and the pole 23, the insulating part 22 or the cover plate 2 (the side wall 13 of the shell 1) are compounded together by utilizing a riveting or spin riveting process, namely, the rivet is placed in the mounting hole reserved for the pole 20 and is riveted on the cover plate 2 or the shell 1 by adopting a spin riveting process, so that the compounded insulating part 22 is uniformly pressed and deformed, and the insulating part 22 cannot be deformed unevenly or excessively extruded and damaged; through the process of combining the compounding and the riveting, the battery has better sealing property and positive and negative insulation properties. The compound mode includes, but is not limited to, compound combination modes such as injection molding, glue bonding, hot press compounding, ultrasonic welding, spraying and curing, high temperature curing agent, and in addition, in the compound process, the mounting hole of the pole 20 needs to be reserved in the insulating part 22. According to the cost requirement, 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 adopted as the insulating part 22, and the insulating part 22 is compounded into the hollow hole 21.

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: at least one of the case 1 and the cover plate 2 of the present embodiment is provided with a step 4, the cover plate 2 is fitted to the case 1, the case 1 is provided with a liquid injection hole 12, a sealing member 121 is attached to the outside of the liquid injection hole 12, the case 1 includes a side wall 13 and a bottom wall 14, the side wall 13 and the bottom wall 14 enclose a container, the inside or outside of the side wall 13 is provided with an explosion-proof pattern 131, and the bottom surface of the side wall 13 or the cover plate 2 is provided with an insulating layer. The opening 11 is formed in the shell 1, then the cover plate 2 is fixed on the opening 11, and the edge of at least one of the shell 1 and the cover plate 2 is provided with the step 4, so that the cover plate 2 is embedded into the opening 11 of the shell 1, the structure is convenient for positioning and laser welding, the welding surface of the cover plate 2 and the shell 1 is 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; after the electric core 3 is assembled, the cover plate 2 and the shell 1 can be welded for one time, the welding seam is uniform due to no electrolyte adhesion at the edge of the welding seam, the welding quality is good, the welding effect is improved, the requirement on the welding environment is low, and the integral welding forming is not required under the condition of low humidity, in addition, the bottom of the shell 1 is also provided with a liquid injection hole 12, the electrolyte can be injected after the cover plate 2 and the shell 1 are welded for one time, the influence of the welding of the cover plate 2 and the shell 1 on the electrolyte is avoided, moreover, the liquid injection hole 12 is sealed by a thin sealing piece 121, namely, the edge of the sealing piece 121 is fixed around the liquid injection hole 12 by secondary laser welding, the effect of sealing the liquid injection hole 12 is achieved, the energy requirement of the thin sealing piece 121 on the laser welding is lower, the size of the liquid injection hole 12 is smaller, compared with the welding cover plate 2, the time is shorter, the welding seam path is shorter, the heat radiation during welding is reduced, the influence on the electrochemical environment inside the battery is reduced, and the welding effect can be improved; the inner side or the outer side of the side wall 13 is provided with an explosion-proof line 131 which can also be an explosion-proof nick, laser is adopted for etching, and the nick part can be broken under the preset internal pressure, so that the safety of the battery is ensured; the explosion-proof lines 131 are added, so that the safety of the battery under extreme abuse conditions can be improved, gas is released in advance, and the danger of explosion, fire and the like caused by further thermal runaway of the battery is prevented; the side wall 13 of the shell 1 or the surface of the cover plate 2 facing the inside of the electric core 3 is sprayed with plastic, namely a thin insulating layer is sprayed, or the side wall is covered with adhesive paper, so that the situation that the positive pole lug contacts the stainless steel on the cover plate 2 to cause short circuit is prevented.

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. A button cell structure, comprising:

a housing (1) provided with an opening (11);

a cover plate (2) mounted on the opening (11);

the battery cell (3) is accommodated in the shell (1), and at least two lugs (30) with different polarities are arranged on the same side of the battery cell (3);

the at least one tab (30) comprises a body part (301) and a bent part (302) connected with the body part (301); one surface of the body part (301) is parallel to a pole piece of the battery cell (3), and the other surface of the body part (301) is attached to a side wall (13) of the shell (1);

the bending part (302) is connected with the pole piece of the battery cell (3) and is bent by a preset angle, and the body part (301) is arranged between the pole piece of the battery cell (3) and the side wall (13) of the shell (1).

2. A button cell structure as defined in claim 1, wherein: the tab (30) is fixedly connected with the side wall (13) of the shell (1) through welding, and the welding mode is laser welding or double-needle resistance welding.

3. A button cell structure as defined in claim 1, wherein: utmost point post (20) are installed in apron (2), at least one utmost point ear (30) through the welding with utmost point post (20) fixed connection, the welding mode is ultrasonic welding, resistance welding or laser welding.

4. A button cell structure as defined in claim 1, wherein: the tab (30) is an aluminum strip, a copper strip, a nickel strip or a copper nickel-plated strip, and the tab (30) is welded on the tab of the battery cell (3) through ultrasonic waves.

5. A button cell structure as defined in claim 1, wherein: the battery cell (3) comprises a first pole piece (31), a diaphragm (33) and a second pole piece (32) which is different from the first pole piece (31) in polarity, the first pole piece (31), the diaphragm (33) and the second pole piece (32) are formed by winding the battery cell (3), the same side or different side of the first pole piece (31) and the second pole piece (32) forms the tab (30), and the first pole piece (31) and the second pole piece (32) are perpendicular to the bottom of the shell (1).

6. A button cell structure as defined in claim 1, wherein: the casing (1) with at least one of apron (2) is provided with step (4), apron (2) inlay in casing (1), casing (1) is provided with annotates liquid hole (12), sealing member (121) are installed to the outside of annotating liquid hole (12).

7. A button cell structure as defined in claim 3, wherein: the novel pole socket is characterized in that the cover plate (2) is provided with a hollowed hole (21), the pole (20) is installed in the hollowed hole (21), an insulating part (22) is arranged on the inner wall of the hollowed hole (21), and the pole (20) is fixed in the hollowed hole (21) through riveting.

8. A button cell structure as defined in claim 7, wherein: the insulating part (22) 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 structure as defined in claim 1, wherein: the shell (1) comprises a side wall (13) and a bottom wall (14), the side wall (13) and the bottom wall (14) enclose a container, and explosion-proof grains (131) are arranged on the inner side or the outer side of the side wall (13).

10. A button cell structure as defined in claim 9, wherein: and an insulating layer is arranged on the bottom surface of the side wall (13) or the cover plate (2).