CN215988973U

CN215988973U - Button cell structure

Info

Publication number: CN215988973U
Application number: CN202121734836.6U
Authority: CN
Inventors: 刘双飞; 曹琳; 乐红春; 余志�; 陈杰
Original assignee: Dongguan Lithium Microelectronics Technology Co ltd
Current assignee: Dongguan Lithium Microelectronics Technology Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-03-08
Anticipated expiration: 2031-07-28

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 cover plate (1) provided with a through hole (11); the pole column (2) is arranged in the through hole (11) in a penetrating mode through riveting; the insulating assembly comprises a sealing ring (3) and a sealing gasket (4), the sealing ring (3) is fixed on the inner wall of the through hole (11), the sealing gasket (4) is fixed on the outer side of the top of the sealing ring (3), and two ends of the sealing gasket (4) in the thickness direction H are respectively abutted against the end face of the cover plate (1) and the pole (2); the sealing ring (3) and the sealing gasket (4) are of an integrated structure or a split structure. According to the utility model, by adding the insulation assembly, the sealing property of the battery can be improved, moisture is prevented from entering the battery, the probability of bulging or increase of the reject ratio of the battery is reduced, and the quality of the battery is improved.

Description

Button cell structure

Technical Field

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

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 structure, when the battery is opened and formed and the battery core is transported in an opening state, moisture enters the battery, so that the battery bulges and the reject ratio is increased, if the process of opening and forming is adopted, secondary packaging is required, the process time is prolonged, and the production efficiency is lower.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: to prior art's not enough, provide a button cell's structure, through increasing insulating subassembly, can improve the leakproofness of battery, inside avoiding moisture to get into the battery, reduce the probability that the battery takes place to swell or the defective rate risees, help improving the quality of battery.

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

a structure of a button cell comprises a cover plate, a battery cover plate and a battery post, wherein the cover plate is provided with a through hole, and the battery post is arranged in the through hole in a penetrating way through riveting; insulating assembly, including sealing washer and sealed the pad, the sealing washer is fixed the inner wall of through-hole, sealed pad is fixed the top outside of sealing washer, sealed pad at the both ends of thickness direction butt respectively in the terminal surface of apron with utmost point post, the sealing washer with sealed formula structure as an organic whole or split type structure of filling up.

Preferably, the sealing ring is compounded to the through hole through a compounding process, and at least part of the sealing gasket is compounded to the end face of the cover plate through a compounding process.

Preferably, the top and the bottom of utmost point post are provided with first outer edge and the outer edge of second respectively, utmost point post first outer edge reaches the outer edge of second forms the I shape structure.

Preferably, the sealing ring includes a body portion, a first extension portion and a second extension portion, the first extension portion and the second extension portion are respectively disposed at the top and the bottom of the body portion, an outer side of the first extension portion is located between the first outer edge and the cover plate, and the second extension portion is located between the second outer edge and the cover plate.

Preferably, the top or bottom of the insulation assembly is provided with a metal gasket.

Preferably, the material of the insulation component is one of polypropylene rubber, fluorine rubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene rubber, butyl rubber, curing glue, PFA, ceramic, glass and styrene butadiene rubber.

Preferably, the portable electronic device further comprises a shell, at least one of the shell and the cover plate is provided with a step, and the edge of the cover plate is embedded in the shell.

Preferably, an explosion-proof notch is arranged inside or outside the side wall of the shell, and the shape of the explosion-proof notch is arc-shaped or circular.

Preferably, the battery cell further comprises a battery cell in a winding structure or a lamination structure, wherein the battery cell is provided with at least two tabs, one tab is fixed on the pole through welding, and the other tab is fixed on the shell through welding.

Preferably, one of the tabs is electrically connected with the pole through ultrasonic welding, laser welding, double-pin resistance welding or single-pin resistance welding, and the other tab is electrically connected with the bottom of the shell through ultrasonic welding, laser welding, double-pin resistance welding or single-pin resistance welding.

The utility model has the beneficial effects that the pole type electric connector comprises a cover plate, a terminal post and a connecting piece, wherein the cover plate is provided with a through hole, and the terminal post is arranged in the through hole in a penetrating way through riveting; insulating assembly, including sealing washer and sealed the pad, the sealing washer is fixed the inner wall of through-hole, sealed pad is fixed the top outside of sealing washer, sealed pad at the both ends of thickness direction butt respectively in the terminal surface of apron with utmost point post, the sealing washer with sealed formula structure as an organic whole or split type structure of filling up. Because in the existing structure, when the battery is opened and formed and the battery core is transported in an opening state, moisture enters the battery, so that the battery bulges and the reject ratio is increased, the sealing ring and the sealing gasket are sequentially compounded to the end surfaces of the through hole and the cover plate through a compounding process, and a mounting hole for riveting the pole column is reserved, meanwhile, the compounding process is adopted, the bonding effect between the insulating component and the cover plate can be improved, the whole sealing performance of the cover plate is improved, then the pole column with a rivet structure is riveted on the cover plate through a spin riveting process, the insulating component can be uniformly deformed under pressure by adopting the spin riveting process, the condition that the insulating component is not uniformly deformed or excessively extruded and damaged is avoided, through the compounding process and the riveting process, the battery has good sealing performance, and better insulation between positive and negative is ensured, wherein the sealing ring is fixed on the inner wall of the through hole, can improve sealed and insulating properties between the lateral wall of utmost point post and the inner wall of through-hole, sealed the pad is fixed in the top outside of sealing washer, plays the effect of terminal surface and utmost point post of insulating and sealed apron, inside reduction moisture enters into the battery from the gap between the two, helps reducing the probability that the battery takes place the inflation. According to the utility model, by adding the insulation assembly, the sealing property of the battery can be improved, moisture is prevented from entering the battery, the probability of bulging or increase of the reject ratio of the battery is reduced, and the quality of the battery 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 a schematic structural diagram of a cover plate according to a first embodiment of the present invention.

Fig. 3 is a schematic view of a cover plate and a housing according to a first embodiment of the present invention.

Fig. 4 is a schematic top view of the first embodiment of the present invention.

Fig. 5 is a schematic bottom view of the first embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 8 is a schematic structural view of a cover plate according to a third embodiment of the present invention.

Fig. 9 is a schematic structural view of a fourth embodiment of the present invention.

Wherein the reference numerals are as follows:

1-cover plate; 11-a through hole;

2-pole column; 21-a first outer edge; 22-a second outer edge;

3-sealing ring; 31-a body portion; 32-a first extension; 33-a second extension;

4-a sealing gasket;

5-a metal gasket;

6-a shell; 106-step;

7-explosion-proof scoring;

8-electric core; 81-pole ear;

h-thickness 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 9, but the present invention is not limited thereto.

Implementation mode one

The first embodiment will be described with reference to the accompanying drawings 1 to 5

The button cell structure comprises a cover plate 1 provided with a through hole 11; the pole 2 is arranged in the through hole 11 in a penetrating mode through riveting; insulating assembly, including sealing washer 3 and sealed 4 of filling up, the inner wall at through-hole 11 is fixed to sealing washer 3, and sealed 4 of filling up is fixed in the top outside of sealing washer 3, and sealed 4 both ends at thickness direction H of filling up respectively the butt in the terminal surface and the utmost point post 2 of apron 1, and sealing washer 3 and sealed 4 of filling up are split type structure.

Because in the existing structure, when the battery is opened and formed and the battery core is transported in an opening state, moisture enters the battery, so that the battery bulges and the reject ratio is increased, the sealing ring 3 and the sealing gasket 4 are sequentially compounded to the through hole 11 and the end surface of the cover plate through the compounding process, and the mounting hole for riveting the pole 2 is reserved, meanwhile, the compounding process is adopted, the bonding effect between the insulating component and the cover plate 1 can be improved, the whole sealing performance of the cover plate 1 is improved, then the pole 2 with the rivet structure is riveted on the cover plate 1 through the spin riveting process, the insulating component can be uniformly pressed and deformed by adopting the spin riveting process, the condition that the insulating component is not uniformly deformed or excessively extruded and damaged is avoided, through the compounding process and the riveting process, the battery has good sealing performance, and better insulation between positive electrode and negative electrode is ensured, wherein, sealing washer 3 is fixed at the inner wall of through-hole 11, can improve sealed and insulating properties between the lateral wall of utmost point post 2 and the inner wall of through-hole 11, and sealed 4 of filling up is fixed in the top outside of sealing washer 3, plays the effect of insulating and sealed terminal surface and utmost point post 2 of apron 1, and inside the reduction moisture entered into the battery from the gap between the two, help reducing the probability that the battery takes place the inflation.

And respectively compounding the sealing ring 3 and the sealing gasket 4 on the cover plate 1 in a compounding mode including but not limited to a compound combination mode of injection molding, glue adhesion, hot-press compounding, ultrasonic welding, plastic spraying solidification, high-temperature curing agent, normal-temperature pressing, high-temperature sintering and the like.

In the structure of the button cell according to the utility model, the sealing ring 3 is compounded in the through hole 11 by a compounding process, and at least part of the sealing gasket 4 is compounded on the end surface of the cover plate 1 by a compounding process. Specifically, by adopting a composite process, the bonding effect between the sealing ring 3 and the sealing gasket 4 and the cover plate 1 can be improved, and the overall sealing performance of the cover plate 1 is improved.

In the structure of the button cell, the top and the bottom of the pole 2 are respectively provided with a first outer edge 21 and a second outer edge 22, and the pole 2, the first outer edge 21 and the second outer edge 22 form an i-shaped structure. Specifically, the first outer edge 21 and the second outer edge 22 enclose a groove for embedding the insulating assembly, so that the probability of displacement or shaking of the insulating assembly is reduced, and meanwhile, the first outer edge 21 and the second outer edge 22 are sequentially arranged along the thickness direction H to limit the position of the insulating assembly in the thickness direction H.

In the structure of the button cell according to the present invention, the sealing ring 3 comprises a body 31, a first extension 32 and a second extension 33, the first extension 32 and the second extension 33 are respectively disposed at the top and the bottom of the body 31, the outer side of the first extension 32 is located between the first outer rim 21 and the cover plate 1, and the second extension 33 is located between the second outer rim 22 and the cover plate 1. Increase first extension 32 and second extension 33, can surround the inner wall of through-hole 11, and apron 1 and the up end and the lower terminal surface that the through-hole 11 corresponds, this somatic part 31, first extension 32 and second extension 33 enclose into similar concave structure, block sealing washer 3 between utmost point post 2 and through-hole 11, reduce the probability that sealing washer 3 takes place the displacement or rocks, wherein, first extension 32 plays insulating and airtight first outer edge 21 and the effect of apron 1, second extension 33 plays insulating and airtight second outer edge 22 and the effect of apron 1, reduce the probability that moisture enters into battery inside.

In the structure of the button cell, the metal gasket 5 is arranged at the top of the insulating assembly, and the metal gasket 5 is added, so that the whole structure of the cover plate 1 is more compact, the probability of displacement or shaking of the components of the cover plate 1 is reduced, wherein the size of the metal gasket 5 can be adjusted according to the size of the actual cell.

In the structure of the button cell according to the utility model, the material of the insulating component is one of polypropylene rubber, fluorine rubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation rubber, ethylene propylene rubber, butyl rubber, curing rubber, PFA, ceramic, glass and styrene butadiene rubber. According to the cost requirement, one of polypropylene rubber, fluororubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation rubber, ethylene propylene rubber, butyl rubber, curing rubber, PFA, ceramic, glass and styrene butadiene rubber can be used as the material of the insulating component, and the sealing ring 3 and the sealing gasket 4 can be the same or different.

In the structure of the button cell according to the utility model, the seal further comprises a housing 6, at least one of the housing 6 and the cover plate 1 is provided with a step 106, and the edge of the cover plate 1 is embedded in the housing 6. Specifically, an opening is formed in the shell 6, then the cover plate 1 is fixed on the opening, and the edge of at least one of the shell 6 and the cover plate 1 is provided with a step 106, so that the cover plate 1 is embedded into the opening of the shell 6, the structure is convenient for positioning and laser welding, the welding surface of the cover plate 1 and the shell 6 is in the horizontal direction, the influence of gravity can be eliminated, the welding seam is uniform, the welding quality is good, and the welding effect is improved; after the electric core 8 is assembled, the cover plate 1 and the shell 6 can be welded once, electrolyte is not attached to the edge of a welding seam, so that the welding seam is uniform, the welding quality is good, the welding effect is improved, the requirement on the welding environment is low, integral welding forming is not required to be carried out under the condition of low humidity, and the influence on the electrolyte caused by the welding of the cover plate 1 and the shell 6 is avoided. Wherein, the side wall of the shell 6 or the surface of the cover plate 1 facing the inside of the battery cell 8 is coated with a thin insulating layer by a plastic spraying mode or is covered by adhesive tape, so as to prevent the short circuit caused by the contact of the positive pole lug with the metal on the cover plate 1.

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

In the structure of the button cell according to the utility model, the inside or outside of the side wall of the sealed housing 6 is provided with an explosion-proof nick 7, and the shape of the explosion-proof nick 7 is arc-shaped or circular. The anti-explosion nicks 7 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 safety of the battery under extreme abuse conditions can be increased, gas is released in advance, and the further thermal runaway of the battery is prevented from generating explosion, fire and other dangers.

In the structure of the button cell according to the utility model, the seal further comprises a cell 8 in a winding structure, the cell 8 is provided with at least two tabs 81, one tab 81 is fixed on the pole 2 by welding, and the other tab 81 is fixed on the casing 6 by welding. In the embodiment, the positive plate, the negative plate and the isolating film are mutually isolated to form a battery cell 8 which is assembled in a casing, the negative plate is welded and communicated with the casing 6 through the metal connecting sheet, the positive plate is welded and communicated with the pole 2 of the cover plate 1 through the metal connecting sheet, specifically, the positive plate, the negative plate and the isolating film form the battery cell 8 through winding or lamination, and the positive and negative pole lugs are led out from the same end or different ends of the battery cell 8; the positive electrode lug and the negative electrode lug are respectively an aluminum strip and a copper nickel plating strip (copper strip and nickel strip), and the lug 81 is welded on the empty foil of the corresponding pole piece by adopting an ultrasonic welding mode; the anodal utmost point ear of electricity core 8 passes through ultrasonic bonding, and resistance weld or laser welding weld on apron 1, and the material is one of aluminium, nickel, stainless steel, and the negative pole passes through resistance weld or laser welding lug connection in the inside of casing 6, carries out insulation processing to the non-welded point in aluminium strip, and the processing mode includes but is not limited to hot pressing PP glues, to pasting insulating adhesive tape, coating insulating glue etc..

In the structure of the button cell according to the present invention, one of the tabs 81 is sealed and electrically connected to the terminal 2 by ultrasonic welding, laser welding, double pin resistance welding or single pin resistance welding, and the other tab 81 is electrically connected to the bottom of the case 6 by ultrasonic welding, laser welding, double pin resistance welding or single pin resistance welding. Specifically, the positive electrode tab is electrically connected with the pole of the cover plate 1 through ultrasonic welding or laser welding or double-needle resistance welding or single-needle resistance welding, the negative electrode tab is electrically connected with the metal shell 6 at the bottom of the inner cavity through ultrasonic welding or laser welding or double-needle resistance welding or single-needle resistance welding, and then the battery cell 8 formed by winding or laminating the positive electrode tab, the negative electrode tab and the isolating film is assembled into the metal shell 6.

The working principle of the utility model is as follows:

the sealing ring 3 and the sealing gasket 4 are sequentially compounded to the through hole 11 and the end face of the cover plate 1 through a compounding process, a mounting hole for riveting the pole 2 is reserved, meanwhile, the compound process is adopted, the bonding effect between the insulating component and the cover plate 1 can be improved, the whole sealing performance of the cover plate 1 is improved, then the pole 2 with a rivet structure is riveted on the cover plate 1 through a spin riveting process, the insulating component can be uniformly pressed and deformed by adopting the spin riveting process, the condition that the insulating component is not uniformly deformed or excessively extruded and damaged is avoided, through the compounding process and the riveting process, the battery not only has good sealing performance, but also good insulation between positive and negative is ensured, wherein the sealing ring 3 is fixed on the inner wall of the through hole 11, the sealing performance and the insulating performance between the side wall of the pole 2 and the inner wall of the through hole 11 can be improved, and the sealing gasket 4 is fixed on the outer side of the top of the sealing ring 3, the terminal pole has the effects of insulating and sealing the end face of the cover plate 1 and the terminal pole 2, reduces the moisture entering the battery from the gap between the end face and the terminal pole, and is favorable for reducing the expansion probability of the battery.

After the liquid injection is finished, standing for 1 to 3 days at normal temperature or high temperature, forming the battery, and after the formation is finished, performing a battery performance detection procedure subsequently.

Second embodiment

The difference from the first embodiment is that: the battery cell 8 of the present embodiment is a laminated structure. Specifically, the one end of every layer of negative plate is passed through metal connecting piece welding intercommunication casing 6, the one end of every layer of positive plate with through metal connecting piece welding intercommunication apron 1 utmost point post 2, two kinds of metal connecting piece intervals set up, and walk the line from the lateral wall of the 6 relative both sides of casing, reduce two kinds of metal connecting piece and take place the contact and the probability of short circuit.

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 sealing ring 3 and the sealing gasket 4 of the embodiment are of an integral structure and are formed on the through hole 11 through one-time composite technology, so that the technology is simple, and the production cost is reduced. The bottom of the seal insulation assembly is provided with a metal gasket 5. The sealing ring 3 and the sealing gasket 4 are made of the same material, so that the sealing ring is conveniently formed in the through hole 11 through one-time composite technology, and the overall production cost of the battery can be reduced.

Embodiment IV

The difference from the third embodiment is that: the battery cell 8 of the present embodiment is a laminated structure. Specifically, the one end of every layer of negative plate is passed through metal connecting piece welding intercommunication casing 6, the one end of every layer of positive plate with through metal connecting piece welding intercommunication apron 1 utmost point post 2, two kinds of metal connecting piece intervals set up, and walk the line from the lateral wall of the 6 relative both sides of casing, reduce two kinds of metal connecting piece and take place the contact and the probability of short circuit.

Other structures are the same as those of the third embodiment, and are not described again here.

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 structure of a button cell, comprising:

a cover plate (1) provided with a through hole (11);

the pole column (2) is arranged in the through hole (11) in a penetrating mode through riveting;

the insulating assembly comprises a sealing ring (3) and a sealing gasket (4), the sealing ring (3) is fixed on the inner wall of the through hole (11), the sealing gasket (4) is fixed on the outer side of the top of the sealing ring (3), and two ends of the sealing gasket (4) in the thickness direction H are respectively abutted against the end face of the cover plate (1) and the pole (2);

the sealing ring (3) and the sealing gasket (4) are of an integrated structure or a split structure.

2. A button cell structure as defined in claim 1, wherein: the sealing ring (3) is compounded to the through hole (11) through a compounding process, and at least part of the sealing gasket (4) is compounded to the end face of the cover plate (1) through the compounding process.

3. A button cell structure as defined in claim 1, wherein: the top and the bottom of utmost point post (2) are provided with first outer edge (21) and the outer edge of second (22) respectively, utmost point post (2) first outer edge (21) reaches outer edge of second (22) forms the I shape structure.

4. A button cell structure as defined in claim 3, wherein: the sealing ring (3) comprises a body part (31), a first extending part (32) and a second extending part (33), the first extending part (32) and the second extending part (33) are respectively arranged at the top and the bottom of the body part (31), the outer side of the first extending part (32) is located between the first outer edge (21) and the cover plate (1), and the second extending part (33) is located between the second outer edge (22) and the cover plate (1).

5. A button cell structure according to any of claims 1-4, characterized in that: and a metal gasket (5) is arranged at the top or the bottom of the insulation component.

6. A button cell structure according to any of claims 1-4, characterized in that: the insulating component is made of one of polypropylene rubber, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene rubber, butyl rubber, curing glue, PFA, ceramic, glass and styrene butadiene rubber.

7. A button cell structure according to any of claims 1-4, characterized in that: the novel LED lamp cover is characterized by further comprising a shell (6), at least one of the shell (6) and the cover plate (1) is provided with a step (106), and the edge of the cover plate (1) is embedded in the shell (6).

8. A button cell structure as defined in claim 7, wherein: the explosion-proof shell is characterized in that an explosion-proof notch (7) is arranged inside or outside the side wall of the shell (6), and the shape of the explosion-proof notch (7) is arc-shaped or circular.

9. A button cell structure as defined in claim 7, wherein: the battery cell comprises a battery cell (8) of a winding structure or a lamination structure, wherein the battery cell (8) is provided with at least two tabs (81), one tab (81) is fixed on the pole column (2) through welding, and the other tab (81) is fixed on the shell (6) through welding.

10. A button cell structure as defined in claim 9, wherein: one of them utmost point ear (81) through ultrasonic bonding, laser welding, double needle resistance weld or single needle resistance weld with utmost point post (2) electricity is connected, another utmost point ear (81) through ultrasonic bonding, laser welding, double needle resistance weld or single needle resistance weld with the bottom electricity of casing (6) is connected.