CN215896535U - Button cell and electronic product thereof - Google Patents

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly discloses a button cell and an electronic product thereof, wherein the button cell comprises a first shell, a second shell, a pole column, an insulating sheet, a positioning connecting sheet and a core body, wherein the first shell is provided with an opening end; the second shell is provided with a first through hole, and the first shell and the second shell are matched with each other to form an accommodating cavity; the pole is fixedly arranged in the first through hole; the insulating sheet is used for sealing a gap between the pole and the second shell; the upper end surface of the positioning connecting sheet is attached to the lower end surface of the insulating sheet, and the positioning connecting sheet and the insulating sheet are accommodated in the opening end. By adopting the structural design, the thickness of the first shell and the second shell is reduced, the internal space of the battery is increased, the energy density of the battery is improved, the direction of a welding seam between the first shell and the second shell is changed from vertical to horizontal, the welding seam is uniform, the welding quality is good, and the packaging tightness of the button battery is improved.

Description

Button cell and electronic product thereof

Technical Field

The utility model belongs to the technical field of lithium batteries, and particularly relates to a button cell and an electronic product thereof.

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. There are many types of button cells, among which the lithium ion button cell is one of the highest energy density and the highest working voltage (platform 3.7V, even higher, other is generally 3.0V or lower), and can be widely used if it can solve the difficulty of industrial manufacturing.

At present, in order to improve the capacity of the button cell, the space utilization rate of the button cell needs to be increased, namely, the thicknesses of a cover plate, a shell and the like of the cell are reduced.

However, in the conventional button cell, in order to meet the matching performance between the cover plate and the shell, only the cover plate can be thinned or the shell can be thinned, so that the requirement that the cover plate and the shell are thinned at the same time is difficult to meet.

The existing button cell, as shown in fig. 1, is provided with a step structure at the upper end of the casing for enhancing the structural firmness of the button cell, but this structural design has the following disadvantages:

firstly, the mouth of the shell is added with steps, and the wall thickness of the shell needs to be increased, which is contrary to the reduction of the thickness.

Secondly, according to the existing industrial level, under the condition that the wall thickness of the shell is thin, the difficulty of the process for increasing the steps of the shell is very high, and good steps are difficult to form.

And thirdly, steps are added at the edge of the cover plate, so that the thickness of the cover plate is increased, the volume of the battery is increased, and the energy density of the battery is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: through providing a button cell and electronic product thereof, solved the problem that current battery energy density is low, improve battery volume utilization ratio, improve battery volume energy density promptly, have better leakproofness and insulating nature simultaneously.

In order to achieve the purpose, the utility model adopts the following technical scheme: a button cell comprises a first shell, a second shell, a pole column, an insulating sheet, a positioning connecting sheet and a core body, wherein the first shell is provided with an opening end; the second shell is provided with a first through hole, and the first shell and the second shell are matched with each other to form an accommodating cavity; the pole is fixedly installed in the first through hole, and the upper end face of the pole and the upper end face of the first shell are kept flush; the insulating sheet is used for sealing a gap between the pole and the second shell; the upper end surface of the positioning connecting sheet is attached to the lower end surface of the insulating sheet, and the positioning connecting sheet and the insulating sheet are accommodated in the opening end; the core body is fixedly installed in the containing cavity, and the core body is electrically connected with the first shell and the pole respectively.

Furthermore, the second shell, the pole, the insulating sheet and the positioning connecting sheet are in composite connection in a stamping bonding or high-temperature sintering mode.

Further, the second shell, the pole, the insulating sheet and the positioning connecting sheet are coaxially arranged.

Furthermore, a second through hole corresponding to the first through hole is formed in the insulating sheet, and the aperture of the second through hole is smaller than that of the first through hole.

Further, the aperture of the second through hole is smaller than the diameter of the pole.

Furthermore, a third through hole corresponding to the second through hole is arranged on the positioning connecting piece, and the aperture of the third through hole is larger than that of the second through hole.

Further, the diameter of the positioning connecting sheet and the diameter of the insulating sheet are both equal to the inner diameter of the first shell.

Further, the first shell and/or the second shell are/is provided with explosion-proof lines.

Further, a liquid injection hole is formed in the second shell and used for injecting electrolyte.

An electronic product comprises the button cell.

The utility model has the beneficial effects that: a button cell comprises a first shell, a second shell, a pole column, an insulating sheet, a positioning connecting sheet and a core body, wherein the first shell is provided with an opening end; the second shell is provided with a first through hole, and the first shell and the second shell are matched with each other to form an accommodating cavity; the pole is fixedly installed in the first through hole, and the upper end face of the pole and the upper end face of the first shell are kept flush; the insulating sheet is used for sealing a gap between the pole and the second shell; the upper end surface of the positioning connecting sheet is attached to the lower end surface of the insulating sheet, and the positioning connecting sheet and the insulating sheet are accommodated in the opening end; the core body is fixedly installed in the containing cavity, and the core body is electrically connected with the first shell and the pole respectively. The button cell provided by the utility model adopts the structural design, simultaneously reduces the thicknesses of the first shell and the second shell, increases the internal space of the cell, improves the energy density of the cell, does not need to add a step structure on the first shell or the second shell, through setting up the positioning connection piece, first casing and second casing have effectively been avoided and the aversion phenomenon has taken place, the second casing, insulating piece and positioning connection piece closely pile up in proper order, the joint is in the open end department of first casing, the welding seam direction between first casing and the second casing is the level by vertical transition, avoid receiving the influence of gravity to lead to the inhomogeneous phenomenon of welding seam welding to take place, make the welding seam even, welding quality is good, the encapsulation compactness of button cell has been improved, can not produce the clearance, make the battery have good leakproofness, the problem that current steel-clad button cell volume utilization is low and the leakproofness is poor has been solved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional button cell;

fig. 2 is a schematic structural diagram of a button cell in embodiment 1 of the utility model;

fig. 3 is a second schematic structural diagram of a button cell in embodiment 1 of the utility model;

fig. 4 is a third schematic structural diagram of a button cell in embodiment 1 of the utility model;

fig. 5 is a fourth schematic structural diagram of a button cell in embodiment 1 of the utility model;

FIG. 6 is a schematic structural diagram of an explosion-proof pattern according to embodiment 1 of the present invention;

FIG. 7 is a second schematic structural view of an anti-explosion pattern in embodiment 1 of the present invention;

fig. 8 is a third schematic structural view of an anti-explosion pattern in embodiment 1 of the present invention;

FIG. 9 is a fourth schematic structural view of an anti-explosion pattern in embodiment 1 of the present invention;

wherein: 1-a first housing; 2-a second housing; 3-pole column; 4-insulating sheets; 5-positioning a connecting sheet; 6-a core body; 7-explosion-proof line.

Detailed Description

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

As shown in fig. 2 to 5, the button cell provided in embodiment 1 includes a first casing 1, a second casing 2, a terminal 3, an insulating sheet 4, a positioning connecting sheet 5, and a core 6, where the first casing 1 is provided with an open end; the second shell 2 is provided with a first through hole, and the first shell 1 and the second shell 2 are matched with each other to form an accommodating cavity; the pole 3 is fixedly arranged in the first through hole, and the upper end face of the pole 3 is flush with the upper end face of the first shell 1; the insulating sheet 4 is used for sealing a gap between the pole 3 and the second housing 2; the upper end surface of the positioning connecting sheet 5 is attached to the lower end surface of the insulating sheet 4, and the positioning connecting sheet 5 and the insulating sheet 4 are accommodated in the opening end; core 6 fixed mounting is in the holding intracavity, and core 6 respectively with first casing 1 and utmost point post 3 electric connection. The button cell provided by the utility model adopts the structural design, simultaneously reduces the thickness of the first shell 1 and the second shell 2, increases the internal space of the cell, improves the energy density of the cell, does not need to add a step structure on the first shell 1 or the second shell 2, through setting up positioning connection piece 5, first casing 1 and second casing 2 have effectively been avoided and the aversion phenomenon takes place, second casing 2, insulating piece 4 and positioning connection piece 5 closely pile up in proper order, the joint is in the open end department of first casing 1, the welding seam direction between first casing 1 and the second casing 2 is the level by vertical transition, avoid receiving the influence of gravity to lead to the inhomogeneous phenomenon of welding seam to take place, make the welding seam even, welding quality is good, button cell's encapsulation compactness has been improved, can not produce the clearance, make the battery have good leakproofness, the problem that current box hat button cell volume utilization is low and the leakproofness is poor has been solved.

Preferably, the second housing 2, the pole 3, the insulating sheet 4 and the positioning connecting sheet 5 are compositely connected by means of stamping adhesion or high-temperature sintering. The composite method may further include, but is not limited to, injection molding, glue bonding, ultrasonic welding, plastic spraying and curing, and high temperature curing agent. The positioning connecting sheet 5 can effectively reduce the occurrence of poor contact between the circumferential part of the positive end or the negative end of the button cell and the tab, enhance the working reliability of the button cell, and simultaneously play a role in positioning, thereby improving the matching precision among the second shell 2, the pole 3 and the insulating sheet 4.

The shape of the battery includes, but is not limited to, square, round, oval, irregular, and other structures. The insulation sheet 4 includes, but is not limited to, polypropylene glue, fluorine rubber, neoprene, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl, curing glue, PFA, ceramic, glass, styrene butadiene rubber, carbon fiber.

In this embodiment, the second housing 2, the pole 3, the insulating sheet 4 and the positioning connecting sheet 5 are combined by stamping and bonding, and the following method is adopted:

mode 1:

in the lower mould, placed from bottom to top in order: the positioning connecting sheet 5, the insulating sheet 4, the second shell 2 and the pole 3 are arranged in a concentric circle, then an upper die (with a heating function) is used for punching downwards, and the four parts are bonded together to finally form the cover plate.

Mode 2:

on the basis of the mode 1, the upper insulation sheet 4 is placed above the second shell 2, the insulation sheet 4 and the second shell 2 are arranged in a concentric circle mode, then the upper die is punched downwards, the insulation sheet 4 and the second shell 2 are bonded together, and finally the cover plate is formed.

In the present embodiment, the structure of the pole 3 includes, but is not limited to, a boss type structure, a sheet type structure, an i-shaped structure, and a groove type structure.

Preferably, the second housing 2, the pole 3, the insulating sheet 4 and the positioning connection sheet 5 are coaxially arranged. This kind of structural design, the location of being convenient for can strengthen the matching degree between second casing 2, utmost point post 3, insulating piece 4 and the positioning connection piece 5, is convenient for fix a position fast and places and quick production.

Preferably, the insulating sheet 4 is provided with a second through hole corresponding to the first through hole, and the aperture of the second through hole is smaller than that of the first through hole. The aperture of the second through hole is smaller than the diameter of the pole 3. And a third through hole corresponding to the second through hole is arranged on the positioning connecting sheet 5, and the aperture of the third through hole is larger than that of the second through hole. The diameter of the positioning connection piece 5 and the diameter of the insulation piece 4 are both equal to the inner diameter of the first housing 1. This kind of structural design for be interference fit between insulating piece 4 and utmost point post 3, reinforcing sealing performance, adopt this kind of structural design moreover, can strengthen the firm in connection nature between second casing 2, insulating piece 4, utmost point post 3 and the connection piece, when the inside gas inflation of battery, can bear bigger pressure, greatly reduced the risk of battery head weeping, improved the security performance of battery.

Preferably, the first shell 1 and/or the second shell 2 are provided with explosion-proof lines 7. In the present embodiment, the shape of the anti-explosion lines 7 includes, but is not limited to, an arc shape, a semicircular shape, a V shape, a special shape, etc., and the laser etching is used to rupture the scored portion under a specific internal pressure, thereby ensuring the safety of the battery.

Preferably, the second casing 2 is provided with a liquid injection hole for injecting the electrolyte.

The button cell battery in this example 1 is produced by the following process:

step 1, winding or laminating an isolating film to form a core body 6, and leading positive and negative electrode lugs out of two ends of a battery core;

step 2: the positive electrode lug and the negative electrode lug are respectively an aluminum strip and a copper nickel plating strip (a copper strip and a nickel strip), and are welded on the hollow foil of the corresponding pole piece by ultrasonic welding;

and step 3: an anode tab of the battery cell is welded on an anode pole 3 (the anode pole 3 is made of one of aluminum, nickel and stainless steel) by ultrasonic welding, resistance welding or laser welding, a cathode is directly welded inside the shell by resistance welding or laser welding, and non-welding points of an aluminum strip are subjected to insulation treatment in a processing mode including but not limited to hot-pressing PP glue, pasting insulating gummed paper, coating insulating glue and the like;

and 4, step 4: the second shell 2, the pole 3, the insulating sheet 4 and the positioning connecting sheet 5 are combined and connected together in a stamping bonding or high-temperature sintering mode to form a cover plate;

and 5: the core body 6 is placed into the first shell 1 in an overturning way;

step 6: covering and mounting the cover plate formed in the step 4 on the first shell 1, injecting electrolyte through the electrolyte injection hole, and after the electrical core is injected, welding the electrolyte injection hole to achieve the sealing effect;

and 7: explosion-proof nicks are arranged at the upper end of the first shell 1 or the side wall and the bottom of the second shell 2;

and 8: standing at normal temperature or high temperature for 1-3 days, performing battery formation, and finally performing battery performance detection.

Example 2

An electronic product comprising the button cell of embodiment 1.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

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 (10)

1. A button cell battery, characterized in that: comprises that

The device comprises a first shell (1), wherein the first shell (1) is provided with an opening end;

the first shell (1) and the second shell (2) are matched with each other to form an accommodating cavity;

the pole (3) is fixedly installed in the first through hole, and the upper end face of the pole (3) is flush with the upper end face of the first shell (1);

an insulating sheet (4), the insulating sheet (4) being used to seal a gap between the pole (3) and the second housing (2);

the upper end face of the positioning connecting sheet (5) is attached to the lower end face of the insulating sheet (4), and the positioning connecting sheet (5) and the insulating sheet (4) are accommodated in the opening end;

the core body (6), core body (6) fixed mounting be in the holding intracavity, core body (6) respectively with first casing (1) with utmost point post (3) electric connection.

2. A button cell according to claim 1, characterized in that: the second shell (2), the pole (3), the insulating sheet (4) and the positioning connecting sheet (5) are in composite connection in a stamping bonding or high-temperature sintering mode.

3. A button cell according to claim 1, characterized in that: the second shell (2), the pole (3), the insulating sheet (4) and the positioning connecting sheet (5) are coaxially arranged.

4. A button cell according to claim 1, characterized in that: the insulating sheet (4) is provided with a second through hole correspondingly arranged with the first through hole, and the aperture of the second through hole is smaller than that of the first through hole.

5. The button cell according to claim 4, wherein: the aperture of the second through hole is smaller than the diameter of the pole (3).

6. The button cell according to claim 4, wherein: and a third through hole corresponding to the second through hole is arranged on the positioning connecting sheet (5), and the aperture of the third through hole is larger than that of the second through hole.

7. A button cell according to claim 1, characterized in that: the diameter of the positioning connecting sheet (5) and the diameter of the insulating sheet (4) are both equal to the inner diameter of the first shell (1).

8. A button cell according to claim 1, characterized in that: the first shell (1) and/or the second shell (2) are/is provided with explosion-proof grains (7).

9. A button cell according to claim 1, characterized in that: and a liquid injection hole is formed in the second shell (2) and used for injecting electrolyte.

10. An electronic product, comprising: a button cell according to any one of claims 1 to 9.

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