CN214313257U - Button cell - Google Patents

Abstract

The utility model provides a button battery, which comprises an electric core and a shell used for packaging the electric core; the first pole piece comprises a first current collector, and at least one part of a hollow foil area is reserved on the first current collector and is used as a first pole lug; a second pole piece having a polarity opposite to that of the first pole piece; the current collector comprises a second current collector, wherein at least one part of a hollow foil area is reserved on the second current collector and is used as a second tab; the first lug is covered on the surface of one end of the battery cell after being shaped and is conducted with one end of the shell through tight compression joint; and the second lug covers the surface of the other end of the battery cell after being shaped, and is communicated with the other end of the shell through tight compression joint. Compare in current button cell, the utility model discloses a button cell replaces traditional welding with the mode of inseparable crimping instead, has solved traditional unipolar ear button cell welding difficulty, the high problem that is unfavorable for big multiplying power charge-discharge of internal resistance.

Description

Button cell

Technical Field

The utility model relates to a lithium cell field, concretely relates to button cell.

Background

The button cell is also called button cell, and refers to a cell with the external dimension like a small button. The button cell is widely applied to various miniature electronic products due to small body size, the diameter is from 4.8mm to 30mm, and the thickness is from 1.0mm to 7.7 mm; the back-up power supply is generally used for various electronic products, such as computer mainboards, electronic watches, electronic dictionaries, electronic scales, remote controllers, electric toys, cardiac pacemakers, electronic hearing aids, counters, cameras and the like.

The anode and the cathode of the existing button battery cell are mostly provided with a tab (a single-pole tab), and the anode tab and the cathode tab are required to be respectively welded at the upper end and the lower end of the sealing shell in the preparation process. Because the button cell is small in size, the welding process is very inconvenient, and defects such as shell corrosion, poor welding of a lug and a shell, poor welding of a lug and a current collector and the like are easily caused; and the welding process has lower efficiency, low automation degree, is not beneficial to the consistency of products and has higher labor cost. In addition, the button cell with the single-electrode tab is high in internal resistance, so that the button cell is not beneficial to high-rate charging and discharging, and the application of the cell is limited.

In view of the above, it is necessary to provide a technical solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: through providing a button cell, solved current button cell unipolar ear welding difficulty, and the internal resistance is higher and is unfavorable for the problem of big multiplying power charge-discharge.

In order to realize the purpose, the utility model discloses a technical scheme be:

a button battery comprises a battery cell and a shell for packaging the battery cell; the battery cell comprises:

the first pole piece comprises a first current collector, and at least one part of a hollow foil area is reserved on the first current collector and is used as a first pole lug;

a second pole piece having a polarity opposite to that of the first pole piece; the current collector comprises a second current collector, wherein at least one part of a hollow foil area is reserved on the second current collector and is used as a second tab;

the first lug is covered on the surface of one end of the battery cell after being shaped and is conducted with one end of the shell through tight compression joint; and the second lug covers the surface of the other end of the battery cell after being shaped, and is communicated with the other end of the shell through tight compression joint.

Preferably, in the length direction (L) of the first current collector, the length of the first tab is 10% to 100% of the length of the first current collector; and in the length direction (L) of the second current collector, the length of the second tab is 10-100% of the length of the second current collector.

Preferably, the width direction (W) of the first current collector and the second current collector is 1-10 mm for both the first tab and the second tab.

Preferably, the first current collector is provided with at least two first tabs through die cutting, the first tabs are shaped and then connected to form a tab, and the tab is covered on the surface of one end of the battery core; the second current collector is provided with at least two second tabs through die cutting, the second tabs are connected to form a tab after being shaped, and the tab is covered on the surface of the other end of the battery core.

Preferably, after the first tab is shaped, at least part of the first tab is overlapped in the central area of one end surface of the battery core; and after the second lug is shaped, at least part of the second lug is overlapped in the central area of the surface of the other end of the battery core.

Preferably, the first tab is continuously arranged, and the length of the first tab is 30-100% of the length of the first current collector; the second tab is continuously arranged, and the length of the second tab is 30-100% of that of the second current collector.

Preferably, the length of the first tab is equal to the length of the first current collector; the length of the second tab is equal to the length of the second current collector.

Preferably, the casing comprises a first casing and a second casing, and the first casing and the second casing are connected to form a cavity for accommodating the battery core; and an insulating sealing layer is coated on the surface of the first shell connected with the second shell and/or the surface of the second shell connected with the first shell.

Preferably, the first housing is at least partially embedded in or at least partially wrapped around the second housing for connection.

Preferably, the height of the surface of the first shell connected with the second shell is 1/5-4/5 of the height of the battery cell.

Preferably, the insulating and sealing layer comprises at least one of polypropylene, polybutylene terephthalate, polytrimethylene terephthalate and polyethylene terephthalate.

The beneficial effects of the utility model reside in that:

1) compare in current button cell, the utility model discloses a button cell directly reserves the empty paper tinsel district of at least part as utmost point ear, then makes it link together and cover through the plastic and establish on the surface of electric core, again with the inseparable crimping of this utmost point ear and casing, because utmost point ear whole area greatly increased after the plastic, can directly carry out zonulae occludens with its and casing contact, and need not guarantee the connection of utmost point ear and casing with the welded mode, can play the water conservancy diversion effect. Furthermore, the utility model discloses a button cell is provided with a plurality of utmost point ears, owing to cancelled welded connected mode, also can conveniently set up a plurality of utmost point ears in button cell's actual production, has solved traditional unipolar ear button cell internal resistance height from this and has been unfavorable for the problem of big multiplying power charge-discharge.

2) The utility model discloses a button cell has still cancelled traditional sealing washer setting, directly adopts the mode at the surface coating insulating layer of casing to accomplish the sealed of electric core, and the design of this insulating layer can avoid receiving the situation that excessively extrudees and lead to sealed effect variation because of the sealing washer, also further guarantees the zonulae occludens of casing and utmost point ear simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a first pole piece or a second pole piece according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of an electrical core not shaped in an embodiment of the present invention.

Fig. 3 is a top view of the battery cell after shaping according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the first pole piece or the second pole piece according to another embodiment of the present invention.

Fig. 5 is a cross-sectional view of an unshaped battery cell in another embodiment of the present invention.

Fig. 6 is a top view of an unshaped battery cell according to another embodiment of the present invention.

Fig. 7 is a cross-sectional view of the battery cell after preliminary shaping according to another embodiment of the present invention.

Fig. 8 is a top view of a flattened cell in another embodiment of the present invention.

Fig. 9 shows a packaged electric core in another embodiment of the present invention.

In the figure: 1-electric core; 11-a first pole piece; 111-a first tab; 12-a second pole piece; 121-a second tab; 13-a separator; 2-a shell; 21-a first housing; 22-a second housing; 23-insulating sealing layer.

Wherein, the W direction is a width direction of the first current collector or the second current collector, and the L direction is a length direction of the first current collector or the second current collector.

Detailed Description

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

In the description of the present invention, unless expressly stated or limited otherwise, 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt prior art, and conventional model, including circuit connection adopts conventional connection mode among the prior art, does not detailed here again.

As shown in fig. 1 to 9, a button battery includes a battery cell 1 and a casing 2 for enclosing the battery cell 1; the battery cell 1 comprises a first pole piece 11 and a second pole piece 12; the first pole piece 11 comprises a first current collector, and at least a part of a hollow foil area is reserved on the first current collector to be used as a first tab 111; the polarity of the second pole piece 12 is opposite to that of the first pole piece 11; the second pole piece 12 comprises a second current collector, and at least a part of a hollow foil area is reserved on the second current collector to be used as a second pole lug 121; the first tab 111 is shaped and then covered on the surface of one end of the battery core 1, and is tightly pressed and connected with one end of the shell 2; the second tab 121 is shaped and then covered on the surface of the other end of the battery cell 1, and is tightly pressed and connected with the other end of the casing 2.

Further, in the length direction (L) of the first current collector, the length of the first tab 111 is 10% to 100% of the length of the first current collector; in the length direction (L) of the second current collector, the length of the second tab 121 is 10-100% of the length of the second current collector. Compare in current button cell, the utility model discloses a button cell has promoted utmost point ear on the mass flow body and has taken up the proportion, not only can improve its area of contact with the casing and make the crimping inseparabler, and also helps promoting the multiplying power of battery.

Further, the widths of the first tab 111 and the second tab 121 in the width direction (W) of the first current collector and the second current collector are 1 to 10 mm. The width direction of the tab is the same as that of the current collector, and is the W direction.

In one embodiment of the present invention, as shown in fig. 1 to 3, the first current collector is provided with at least two first tabs 111 through die cutting, and the first tabs 111 are shaped and then connected to form a tab and covered on the surface of one end of the battery cell 1; the second current collector is provided with at least two second electrode lugs 121 through die cutting, and the second electrode lugs 121 are shaped and then connected to form an electrode lug and are covered on the surface of the other end of the battery cell 1.

Further, the first current collector is provided with at least two first tabs 111 through die cutting, and the first tabs 111 are at least partially overlapped in the central area of one end surface of the battery core 1 after being shaped; the second current collector is provided with at least two second tabs 121 through die cutting, and the second tabs 121 are at least partially overlapped in the central area of the surface of the other end of the battery cell 1 after being shaped. The first utmost point ear 111 of this kind of design can adopt welded method to be in close connection with a plurality of first utmost point ears 111 together, can also adopt welded method to be connected utmost point ear and casing 2 certainly, but in actual production because the design of a plurality of utmost point ears is difficult to weld it with casing 2, can preferably adopt the utility model discloses a design method directly covers after the utmost point ear plastic and closes casing 2, because the area greatly increased of utmost point ear, its and casing 2's contact surface also increases, then directly covers casing 2 and also can guarantee the zonulae occludens of casing 2 and utmost point ear.

In another embodiment of the present invention, as shown in fig. 4 to 9, the first tab 111 is continuously disposed, and the length thereof is 30 to 100% of the length of the first current collector; the second tab 121 is continuously disposed and has a length of 30-100% of the length of the second current collector.

Further, the length of the first tab 111 is equal to the length of the first current collector; the length of the second tab 121 is equal to the length of the second current collector.

Specifically, the continuously arranged first tab 111 is shaped and then tightly contacted to form an outwardly protruding tab, and the tab is covered on the surface of one end of the battery cell 1 and is conducted with one end of the shell 2 through tight compression; the second tab 121, which is continuously arranged, is shaped and then tightly contacted to form a tab protruding outwards, covers the surface of the other end of the battery cell 1, and is connected with the other end of the casing 2 through tight compression. Preferably, when the lengths of the first tab 111 and the second tab 121 are equal to the lengths of the corresponding current collectors, the first tab 111 and the second tab 121 are shaped and then are coated on two surfaces of the battery cell 1.

Further, the casing 2 comprises a first casing 21 and a second casing 22, and the first casing 21 and the second casing 22 are connected to form a cavity for accommodating the battery cell 1; the surface of the first casing 21 connected to the second casing 22 and/or the surface of the second casing 22 connected to the first casing 21 is coated with an insulating sealing layer 23. In actual production, the insulating sealing layer 23 can be extended properly, so that the insulating sealing layer 23 is coated on the periphery of the first shell 21 connected with the second shell 22, the sealing performance of the button cell is further improved, and the safety performance is improved. The insulating and sealing layer 23 may be at least one of polypropylene (PP), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), and polyethylene terephthalate (PET). The insulating sealing layer 23 has good adhesion and high elasticity, and can well buffer the extrusion between the shells 2. In addition, the insulating sealing layer 23 also has good corrosion resistance, and can better resist the corrosion of the electrolyte, so as to ensure the stability of the inside of the battery cell 1. Compared with the traditional sealing ring, the adoption of the insulating sealing layer 23 can ensure the sealing performance of the battery for long time, namely the tightness of connection between the shell 2 and the pole lug.

Further, the thickness of the insulating sealing layer 23 is 0.001 to 1 mm. When the insulating sealing layer 23 is coated only on the surface where the first casing 21 and the second casing 22 are connected, the thickness of the insulating sealing layer 23 may be increased as appropriate, so that the first casing 21 and the second casing 22 are connected more tightly. Similarly, when the insulating sealant 23 is coated only on the surface of the second casing 22 connected to the first casing 21, the thickness of the insulating sealant 23 should be increased as appropriate. If the two surfaces of the first casing 21 and the second casing 22 are both covered with the insulating sealing layer 23, the thickness of the insulating sealing layer 23 can be properly arranged close to the middle, and the insulating sealing layers 23 on the two sides can be contacted to ensure that the first casing 21 and the second casing 22 can be sealed integrally. Preferably, when the two surfaces of the first shell 21 and the second shell 22 are connected to each other, the insulating sealing layer 23 is coated on the two surfaces, and the thickness of the insulating sealing layer 23 is 0.005-0.5 mm.

Further, the first housing 21 and the second housing 22 are connected by at least one of heat melting, dispensing and ultrasonic welding. The insulating sealing layer 23 is in a molten state by adopting hot melting, namely, by raising the temperature, so that the first shell 21 and the second shell 22 are bonded together; the glue dispensing method is to coat glue on the surface of the insulating sealing layer 23 and achieve the purpose of sealing through the solidification of the glue; ultrasonic welding is to melt the insulating sealing layer 23 by ultrasonic waves, and to achieve sealing by adhering and fixing the insulating sealing layer 23. Preferably, the connection is carried out in a hot melting mode, so that the sealing performance of the shell 2 is guaranteed, and the connection performance of the shell 2 and the pole lug is guaranteed.

Further, the first housing 21 is at least partially embedded in or at least partially wrapped around the second housing 22 for connection. That is, when the first housing 21 is the upper housing 2 and the second housing 22 is the lower housing 2, the first housing 21 can be at least partially embedded in the second housing 22 for connection, that is, the width of the first housing 21 can be considered to be smaller than that of the second housing 22; and if the first shell 21 at least partially covers the second shell 22 for connection, the width of the first shell 21 is larger than that of the second shell 22. And vice versa.

Furthermore, the height of the surface where the first shell 21 and the second shell 22 are connected is 1/5-4/5 of the height of the battery cell 1. Preferably, the height of the surface where the first casing 21 and the second casing 22 are connected is 1/2-4/5 of the height of the battery cell 1.

The preparation method of the button cell comprises the following steps:

coating a first active material region in a first current collector to prepare a first pole piece 11; at least one part of the first current collector is reserved as a first tab 111;

coating a second active material region in a second current collector to prepare a second electrode sheet 12; at least one part of the second current collector is reserved as a second pole ear 121;

preparing the first pole piece 11, the second pole piece 12 and the diaphragm 13 to form a battery core 1;

shaping the first tab 111 and enabling the first tab to be covered on the surface of one end of the battery core 1; shaping the second tab 121 and enabling the second tab to be covered on the surface of the other end of the battery cell 1;

and packaging the battery core 1 in a shell 2, wherein one end of the shell 2 is tightly pressed and connected with the first tab 111, and the other end of the shell 2 is tightly pressed and connected with the second tab 121, so that the button battery is prepared.

Further, the shaping is to deform the first tabs 111 to be tightly coupled together and to deform the second tabs 121 to be tightly coupled together by an external force. The specific shaping method comprises the following steps: a specially-made die or equipment is adopted to generate external force to enable the first tab 111 or the second tab 121 to generate preliminary deformation, so that the tabs are inclined towards the center direction of the electric core 1 instead of being in a vertical shape, and if the tabs are in a multi-tab design of die cutting, namely, a button battery shown in figures 1-3, a plurality of tabs are at least partially overlapped in the center area of one end surface of the electric core 1; if the design of continuous or whole tabs is adopted, namely the button battery shown in fig. 4-9, it is ensured that the tabs inclined towards the center direction of the battery core 1 do not cover the center hole of the battery core 1; kneading the flat pole lugs by adopting larger external force to ensure that the deformation of the first pole lug 111 and the second pole lug 121 reaches 90 degrees, and finally forming the first pole lug 111 and the second pole lug 121 which are in close contact and protrude outwards; and finally, the lugs are completely attached and covered on the surface of the battery core 1, and the shaping of the lugs is completed.

Further, the case 2 includes a first case 21 and a second case 22, an insulating sealing layer 23 is coated on a surface where the first case 21 is connected to the second case 22 and/or a surface where the second case 22 is connected to the first case 21, and the sealing of the insulating sealing layer 23 is performed by heat-sealing and fusing the insulating sealing layer 23 to complete the encapsulation of the case 2.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to 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 (9)

1. A button battery comprises a battery core (1) and a shell (2) used for packaging the battery core (1); characterized in that the cell (1) comprises:

the first pole piece (11) comprises a first current collector, and at least one part of a hollow foil area is reserved on the first current collector to be used as a first tab (111);

a second pole piece (12) having a polarity opposite to that of the first pole piece (11); the current collector comprises a second current collector, wherein at least one part of a hollow foil area is reserved on the second current collector to be used as a second tab (121);

the first tab (111) is shaped and then coated on the surface of one end of the battery core (1), and is tightly pressed and connected with one end of the shell (2); and the second tab (121) is shaped and then coated on the surface of the other end of the battery cell (1), and is tightly pressed and connected with the other end of the shell (2).

2. The button cell according to claim 1, wherein the length of the first tab (111) in the length direction (L) of the first current collector is 10% -100% of the length of the first current collector; in the length direction (L) of the second current collector, the length of the second tab (121) is 10-100% of the length of the second current collector.

3. The button battery according to claim 2, wherein the first current collector is provided with at least two first tabs (111) through die cutting, the first tabs (111) are shaped and then connected to form one tab and are coated on the surface of one end of the battery core (1); the second current collector is provided with at least two second tabs (121) through die cutting, the second tabs (121) are shaped and then connected to form a tab, and the surface of the other end of the battery core (1) is covered and arranged.

4. The button battery according to claim 3, characterized in that the first tab (111) is at least partially overlapped in the central area of one end surface of the battery core (1) after being shaped; and the second tab (121) is at least partially overlapped in the central area of the surface of the other end of the battery core (1) after being shaped.

5. The button cell according to claim 2, wherein the first tab (111) is continuously arranged and has a length of 30-100% of the length of the first current collector; the second tab (121) is continuously arranged, and the length of the second tab is 30-100% of that of the second current collector.

6. The button cell according to claim 5, wherein the length of the first tab (111) is equal to the length of the first current collector; the length of the second tab (121) is equal to the length of the second current collector.

7. Button cell according to any one of claims 1 to 6, wherein the casing (2) comprises a first casing (21) and a second casing (22), and the first casing (21) and the second casing (22) are connected to form a cavity for accommodating the electric core (1); the surface of the first shell (21) connected with the second shell (22) and/or the surface of the second shell (22) connected with the first shell (21) is coated with an insulating sealing layer (23).

8. Button cell according to claim 7, wherein the first casing (21) is at least partially embedded in or at least partially wrapped around the second casing (22) for connection.

9. The button battery according to claim 8, characterized in that the surface height of the first shell (21) connected with the second shell (22) is 1/5-4/5 of the height of the battery cell (1).

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