CN213401328U

CN213401328U - Button cell

Info

Publication number: CN213401328U
Application number: CN202022164898.XU
Authority: CN
Inventors: 金振东; 张淼; 孙赵勇; 李升高; 韩子勤; 周燕
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-06-08
Anticipated expiration: 2030-09-27

Abstract

The utility model relates to a button cell, which comprises a hard shell, a soft shell and a pole core, wherein the hard shell and the soft shell are connected in an insulating and sealing way so as to form a sealing cavity at the inner sides of the hard shell and the soft shell; a first tab and a second tab with different polarities are led out of the pole core, and the pole core, the first tab and the second tab are accommodated in the sealing cavity; the soft shell is of an aluminum-plastic composite film structure, the aluminum-plastic composite film structure comprises a first protective layer, a second protective layer and an aluminum foil layer clamped between the first protective layer and the second protective layer, a first conductive region is arranged on the soft shell, a first electrode terminal covers the outer side surface of the aluminum foil layer of the first conductive region, a first inner connecting sheet covers the inner side surface of the aluminum foil layer of the first conductive region, and a first tab is electrically connected with the first inner connecting sheet; and a second conductive area is arranged on the hard shell and is electrically connected with the second pole lug. Compare with the button cell that current utmost point ear is external, avoid first utmost point ear and second utmost point ear external, prevent that first utmost point ear and second utmost point ear atress exogenic action from producing deformation, fracture even.

Description

Button cell

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a button cell.

Background

A button cell is also called a button cell, and refers to a cell with a size similar to a small button, generally having a larger diameter and a thinner thickness. In particular, soft-pack button cells have advantages such as good safety (unlike hard-case button cells that explode) and light weight, and are widely used in various electronic products.

The existing button battery comprises a shell, a pole core, a positive pole lug and a negative pole lug, wherein the pole core is packaged in the shell, and the positive pole lug and the negative pole lug are led out of the pole core and penetrate out of the shell. In the production process of the button cell, the following problems exist in the turnover process after the positive pole lug and the negative pole lug are arranged outside: 1) the positive pole lug and the negative pole lug collide with other button cells, and the surfaces of the button cells are scraped; 2) the positive electrode lug and the negative electrode lug are easy to deform or even break under the action of external force; 3) the positive electrode tab is contacted with the negative electrode tab, so that the internal short circuit of the button battery is caused, and the electrical property is damaged; 4) the lead-out positions of the positive electrode lug and the negative electrode lug have deviation, and the packaging of the button battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the button cell is provided aiming at the problems that an external tab is easy to deform and even break under the action of external force in the existing button cell.

In order to solve the above technical problem, an embodiment of the present invention provides a button battery, which includes a hard casing, a soft casing, and a pole piece, wherein the hard casing and the soft casing are connected in an insulating and sealing manner to form a sealing cavity inside the hard casing and the soft casing;

a first tab and a second tab with different polarities are led out of the pole core, and the pole core, the first tab and the second tab are accommodated in the sealing cavity;

the flexible shell is of an aluminum-plastic composite film structure, the aluminum-plastic composite film structure comprises a first protective layer, a second protective layer and an aluminum foil layer clamped between the first protective layer and the second protective layer, a first conductive region is arranged on the flexible shell, the outer side surface and the inner side surface of the aluminum foil layer of the first conductive region are exposed, a first electrode terminal covers the outer side surface of the aluminum foil layer of the first conductive region, a first inner connecting piece covers the inner side surface of the aluminum foil layer of the first conductive region, and a first tab is electrically connected with the first inner connecting piece;

and a second conductive area is arranged on the hard shell and is electrically connected with the second pole lug.

Optionally, the first electrode terminal entirely covers an outer side surface of the aluminum foil layer of the first conductive region.

Optionally, the first interconnector sheet completely covers an inside surface of the aluminum foil layer of the first conductive zone.

Optionally, the hard shell comprises a metal shell and an encapsulation layer arranged on the metal shell, and the encapsulation layer is in insulation sealing connection with the first protection layer;

the outer side surface and the inner side surface of the metal shell of the second conductive area are both exposed, the inner side surface of the metal shell of the second conductive area is a second interconnection piece, the second interconnection piece is electrically connected with the second electrode lug, and the outer side surface of the metal shell of the second conductive area is a second electrode terminal.

Optionally, the soft shell is a first cylindrical structure with a downward opening, and the soft shell includes a first annular portion extending along the axial direction of the pole core and a first circular bottom connected above the first annular portion; the hard shell is of a second cylindrical structure with an upward opening, and comprises a second annular part extending along the axial direction of the pole core and a second circular bottom connected below the second annular part; the pole piece is located axially between the first and second circular bases.

Optionally, the first conductive region is disposed on the first circular base.

Optionally, the second inner tab is disposed on the second rounded bottom.

Optionally, the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, the first pole piece and the second pole piece have opposite polarities, the first pole tab is led out from the first pole piece, and the second pole tab is led out from the second pole piece.

Optionally, a first sealant is arranged at the joint of the first tab and the first pole piece, and a second sealant is arranged at the joint of the second tab and the second pole piece.

The embodiment of the utility model provides a button cell encapsulates first utmost point ear and second utmost point ear in sealed cavity, and first utmost point ear is connected with the first inner connection piece electricity of soft casing, and the second utmost point ear is connected with the second conduction region electricity of stereoplasm casing, compares with the button cell that current utmost point ear is external, and first utmost point ear and second utmost point ear need not to draw out outside the casing, directly realize through stereoplasm casing and soft casing with electronic component's electricity be connected, can not influence the encapsulation between stereoplasm casing and the soft casing, the equipment of the button cell of being convenient for; the hard shell and the soft shell can protect the first lug and the second lug and prevent the first lug and the second lug from deforming and even breaking under the action of external force; in the production process of the button cell, the first lug and the second lug are prevented from being arranged externally, so that the short circuit caused by rubbing the surfaces of other button cells or the contact of the first lug and the second lug is prevented, the yield of the button cell is ensured, and the production quality is improved.

Drawings

Fig. 1 is a schematic structural view of a button cell according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a button cell according to an embodiment of the present invention;

fig. 3 is an enlarged view of fig. 2 at a.

The reference numerals in the specification are as follows:

1. a hard shell; 11. a second annular portion; 12. a second circular bottom;

2. a soft shell; 21. a first protective layer; 22. an aluminum foil layer; 23. a second protective layer; 24. a first electrode terminal; 25. a first interconnector piece; 26. a first annular portion; 27. a first circular bottom;

3. a pole piece; 4. a first tab; 5. a second tab; 6. a first sealant; 7. and (7) a second sealant.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 and fig. 2, the button cell provided by the embodiment of the present invention includes a hard casing 1, a soft casing 2 and a pole core 3, wherein the hard casing 1 and the soft casing 2 are connected in an insulating and sealing manner to form a sealed cavity inside the hard casing and the soft casing.

The pole core 3 is led out a first tab 4 and a second tab 5 which have different polarities, and the pole core 3, the first tab 4 and the second tab 5 are contained in the sealing cavity.

Soft casing 2 is plastic-aluminum complex film structure, plastic-aluminum complex film structure includes first protective layer 21, second protective layer 23 and the aluminium foil layer 22 of clamp between first protective layer 21 and second protective layer 23, be provided with first conductive region on the soft casing 2, the outside surface and the inboard surface of the aluminium foil layer 22 of first conductive region are all exposed, the outside surface covering of the aluminium foil layer of first conductive region has first electrode terminal 24, the inboard surface covering of the aluminium foil layer of first conductive region has first interconnector piece 25, first utmost point ear 4 is connected with first interconnector piece 25 electricity.

A second conductive area (not shown) is provided on the hard shell 1, which second conductive area is electrically connected to the second pole lug 5.

The sealed cavity is filled with electrolyte to completely immerse the pole core 3 in the electrolyte.

The embodiment of the utility model provides a button cell encapsulates first utmost point ear 4 and second utmost point ear 5 in sealed cavity, and first utmost point ear 4 is connected with the first in-connection piece electricity of soft casing 2, and second utmost point ear 5 is connected with the second conduction region electricity of hard casing 1, compares with the button cell of current utmost point ear external, and first utmost point ear 4 and second utmost point ear 5 need not to draw out outside the casing, directly realize through hard casing 1 and soft casing 2 with electronic component's electricity is connected, can not influence the encapsulation between hard casing 1 and the soft casing 2, the equipment of button cell of being convenient for; the hard shell 1 and the soft shell 2 can protect the first lug 4 and the second lug 5, and the first lug 4 and the second lug 5 are prevented from deforming or even breaking under the action of external force; in the production process of the button cell, the first tab 4 and the second tab 5 are prevented from being arranged externally, so that the short circuit caused by rubbing the surfaces of other button cells or the contact of the first tab 4 and the second tab 5 is prevented, the yield of the button cell is ensured, and the production quality is improved.

Set up first electrode terminal 24 at the outside surface of aluminium foil layer 22, the inboard surface of aluminium foil layer 22 sets up first interconnector piece 25, avoids aluminium foil layer 22 direct and air contact oxidation to generate the oxide layer to prevent to influence electric conductive property.

The utility model discloses a stereoplasm casing 1 and soft casing 2 combine together, and for current soft packet of button cell, stereoplasm casing 1 is difficult for producing the deformation, has improved button cell's intensity, has not only effectively reduced the outward appearance that produces in the production process bad, has improved button cell's yields, and can spill stereoplasm casing 1 outside the installation lees when the installation, has improved button cell's convenience of installation on electronic component greatly; compared with the existing hard shell button battery, the soft shell 2 provides a buffer space for the heating expansion of the button battery, so that the explosion is avoided, and the safety of the button battery is improved.

The aluminum-plastic composite film has good flexibility, the soft shell 2 provides a buffer space for the heating expansion of the button cell, the explosion is prevented, and the processing and the installation are convenient.

The aluminum foil layer 22 serves to mold the soft case 2 and also prevents moisture from entering the electrolyte.

The first protect layer 21 has the function of insulating and protecting the aluminum foil layer 22, and can prevent the aluminum foil layer 22 from being corroded by the electrolyte. Optionally, the first protective layer 21 is a PP layer; of course, the first protective layer may be made of other resin materials instead of PP.

The second protective layer 23 has the functions of insulating and protecting the aluminum foil layer 22, and can prevent the aluminum foil layer 22 from being scratched by other structures and prevent the aluminum foil layer 22 from being directly oxidized by contacting with air to generate an oxide layer. The second protective layer can be made of plastic or rubber; preferably, the second protective layer is a nylon layer.

Preferably, the first electrode terminal 24 entirely covers the outer side surface of the aluminum foil layer 22 of the first conductive region. The contact area of the first electrode terminal 24 is increased, so that the first electrode terminal 24 can be conveniently connected with an electronic element, and the outer side surface of the exposed aluminum foil layer 22 can be prevented from being oxidized to generate an oxide layer, thereby influencing the conductivity.

Preferably, the first interconnector sheet 25 entirely covers the inner surface of the aluminum foil layer 22 of the first conductive zone. The contact area of the first interconnecting piece 25 is increased, so that the first tab 4 is conveniently connected with the first interconnecting piece 25, and the inner side surface of the exposed aluminum foil layer 22 can be prevented from being oxidized to generate an oxide layer, thereby influencing the conductivity.

In one embodiment, the hard case 1 includes a metal case (not shown in the drawings) and an encapsulation layer (not shown in the drawings) disposed on the metal case, and the encapsulation layer is in insulation sealing connection with the first protection layer 21. The sealing connection between the hard shell 1 and the soft shell 2 is realized by the sealing connection between the packaging layer of the hard shell 1 and the first protective layer 21 of the soft shell 2.

The outer side surface and the inner side surface of the metal housing of the second conductive area are exposed, the inner side surface of the metal housing of the second conductive area is a second interconnection piece (not shown in the figure) electrically connected to the second tab, and the outer side surface of the metal housing of the second conductive area is a second electrode terminal (not shown in the figure).

Preferably, the hard shell 1 is a steel-plastic composite film structure, and the metal shell is a steel foil shell.

Preferably, the encapsulating layer is a PP layer, and the soft shell 2 and the hard shell 1 are heat-sealed into a whole by a heat-sealing process. A wall body is formed between the packaging layer of the hard shell 1 and the first protective layer 21 of the soft shell 2, and PP has good corrosion resistance, electrical insulation and plasticity, good sealing performance and capability of preventing electrolyte from leaking. Of course, other resin materials may be used instead of PP for the encapsulation layer.

In one embodiment, as shown in fig. 2, the soft shell 2 is a first cylindrical structure with a downward opening, and the soft shell 2 includes a first annular portion 26 extending along the axial direction of the pole core 3 and a first circular bottom portion 27 connected above the first annular portion 26; the hard shell 1 is a second cylindrical structure with an upward opening, and the hard shell 1 comprises a second annular part 11 extending along the axial direction of the pole core 3 and a second circular bottom part 12 connected below the second annular part 11; the pole core 3 is located axially between the first circular bottom 27 and the second circular bottom 12. The soft shell 2 and the hard shell 1 are more attached to the pole core 3, so that a button battery with a smaller size can be manufactured, and the reduction of the volume energy density of the button battery is avoided.

It should be noted that the metal shell is a second cylindrical structure, and the packaging layer is attached to the outer peripheral wall of the opening end of the metal shell.

In one embodiment, as shown in fig. 2, the first conductive region is disposed on the first circular base 27. The first tab 4 and the first interconnecting piece 25 are convenient to connect, and the processing difficulty is reduced.

Preferably, the first conductive area is located in the center of the first circular base 27.

Preferably, the first conductive region is a circular region.

In one embodiment, the second inner tab is disposed on the second circular base 12. The second tab 5 is conveniently connected with the hard shell 1, and the processing difficulty is reduced.

In one embodiment, as shown in fig. 1 and 2, the first annular portion 26 smoothly transitions with the first rounded bottom portion 27; the abrupt change of the connection between the first annular portion 26 and the first circular bottom portion 27 is avoided to prevent the connection from scratching other electronic components.

Preferably, there is an arc-shaped transition between the first annular portion 26 and the first circular bottom portion 27.

In one embodiment, as shown in fig. 1 and 2, the second annular portion 11 smoothly transitions with the second rounded bottom portion 12; the abrupt change of the connection between the second annular portion 11 and the second circular bottom portion 12 is avoided to prevent the connection from scratching other electronic components.

Preferably, there is an arc-shaped transition between the second annular portion 11 and the second circular bottom portion 12.

In one embodiment, the pole core 3 is formed by winding a first pole piece (not shown), a diaphragm (not shown), and a second pole piece (not shown), wherein the first pole piece and the second pole piece are opposite in polarity, a first pole tab 4 is led out of the first pole piece, and a second pole tab 5 is led out of the second pole piece.

In one embodiment, the lead-out positions of the first tab 4 and the second tab 5 are circumferentially different by an angle of 0 to 180 degrees. The requirement of leading out the lugs at different positions can be met.

Preferably, the lead-out positions of the first tab 4 and the second tab 5 are circumferentially different by 180 degrees. The first lug 4 and the second lug 5 can be led out conveniently, and the mutual interference of the first lug 4 and the second lug 5 is avoided.

In one embodiment, as shown in fig. 2, a first sealant 6 is disposed at a joint of the first tab 4 and the first pole piece. The first sealant 6 is arranged to cover the welding seal between the first tab 4 and the first pole piece, so as to prevent the first pole piece from being damaged.

In one embodiment, as shown in fig. 2, a second sealant 7 is disposed at the joint of the second tab 5 and the second pole piece. The second sealant 7 is arranged to cover the solder print between the second tab 5 and the second electrode plate, so as to prevent the second electrode plate from being damaged.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The button battery is characterized by comprising a hard shell, a soft shell and a pole core, wherein the hard shell and the soft shell are connected in an insulating and sealing manner so as to form a sealing cavity on the inner sides of the hard shell and the soft shell;

2. The button cell according to claim 1, wherein the first electrode terminal completely covers an outer side surface of the aluminum foil layer of the first conductive region.

3. The button cell of claim 1, wherein the first interconnector sheet completely covers an inside surface of the aluminum foil layer of the first conductive region.

4. The button cell according to claim 1, wherein the hard case comprises a metal case and an encapsulation layer disposed on the metal case, the encapsulation layer being in insulation sealing connection with the first protective layer;

5. The button cell according to claim 4, wherein the soft case is a first cylindrical structure with a downward opening, and the soft case includes a first annular portion extending in the axial direction of the pole core and a first circular bottom portion connected above the first annular portion; the hard shell is of a second cylindrical structure with an upward opening, and comprises a second annular part extending along the axial direction of the pole core and a second circular bottom connected below the second annular part; the pole piece is located axially between the first and second circular bases.

6. The button cell of claim 5, wherein the first conductive region is disposed on the first rounded bottom.

7. The button cell of claim 5, wherein the second inner tab is disposed on the second rounded bottom.

8. The button cell according to claim 1, wherein the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, the first pole piece and the second pole piece have opposite polarities, the first pole piece is provided with the first tab, and the second pole piece is provided with the second tab.

9. The button cell according to claim 8, wherein a first sealant is disposed at a junction of the first tab and the first pole piece, and a second sealant is disposed at a junction of the second tab and the second pole piece.