CN212907872U

CN212907872U - Soft package button cell

Info

Publication number: CN212907872U
Application number: CN202021748154.6U
Authority: CN
Inventors: 李升高; 韩子勤; 周燕; 胡大林; 郭玉杰; 廖兴群
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-04-06
Anticipated expiration: 2030-08-19

Abstract

The utility model belongs to the technical field of batteries, and relates to a soft package button battery, which comprises a pole core and a soft package shell; the pole core is accommodated in the soft package shell; the pole core draws forth opposite polarity's first utmost point ear and second utmost point ear along self axial syntropy, and soft packet of casing is worn out from first position of drawing forth in the outer end of first utmost point ear, and soft packet of casing is drawn forth from the second position in the outer end of second utmost point ear, and first position and the second of drawing forth are located the same terminal surface of the axial of soft packet of casing. First utmost point ear and second utmost point ear can be directly wear out and need not buckle many times in soft packet of casing on the same terminal surface of the axial of soft packet of casing to first utmost point ear and second utmost point ear can need not stride the utmost point core, have avoided first utmost point ear and second utmost point ear and the contact potential safety hazard that causes interior short circuit of utmost point core, and can need not set up the spacer, have improved energy density, in addition, because first utmost point ear and second utmost point ear need not buckle many times, also make technology simpler.

Description

Soft package button cell

Technical Field

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

Background

Pouch cells are cells that employ a polymer, typically an aluminum plastic film, as a housing. Compared with a hard-shell battery, the soft-package battery mainly has the following advantages:

(1) the safety is good, and laminate polymer battery adopts the plastic-aluminum membrane packing structurally, and when taking place thermal management out of control or puncture, the plastic-aluminum membrane shell can provide buffer space for electric core, takes place the bulging deformation, and only can catch fire or smoke finally, nevertheless can not explode.

(2) The soft-package battery is lighter than a steel-shell battery with the same capacity by 40% and lighter than an aluminum-shell battery by 20%, so that the soft-package battery generally has higher energy density.

(3) The electrochemical performance is good, the service life is long, the internal resistance of the soft package battery is small, the self-consumption of the battery can be greatly reduced, and the cycle life of the soft package battery is longer.

According to the conventional soft package button battery, a tab is led out from the tail end of a pole piece and needs to be bent for multiple times and then led out from the middle of an upper half shell and a lower half shell, the tab is bent for multiple times and spans over a battery cell main body, the potential safety hazard of internal short circuit exists, and if a spacer is added, the energy density can be sacrificed. Moreover, the tab needs to be bent for many times, the process is complex, and the quality is uncontrollable. In addition, the tabs are bent for multiple times, so that folded edges of the upper half shell and the lower half shell are easily opened, and the size is uncontrollable.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: aiming at the problem that the existing soft package button battery is complex in manufacturing process, the soft package button battery is provided.

In order to solve the technical problem, an embodiment of the utility model provides a soft-package button battery, which comprises a pole core and a soft-package shell; the pole piece is accommodated in the soft package shell;

the pole piece draws forth opposite polarity's first utmost point ear and second utmost point ear along self axial syntropy, the outer end of first utmost point ear is worn out from first position of drawing forth soft-packaged shell, the outer end of second utmost point ear is drawn forth the position from the second and is worn out soft-packaged shell, first draw forth the position with the second draw forth the position and is located on the same terminal surface of the axial of soft-packaged shell.

Optionally, a first protrusion is arranged at the first leading-out position, the outer end of the first tab penetrates out of the first protrusion, and the first tab is connected with the first protrusion in a sealing manner;

and a second protrusion is arranged at the second leading-out position, the outer end of the second tab penetrates out of the second protrusion, and the second tab is connected with the second protrusion in a sealing manner.

Optionally, the first protrusion is bent towards the radial direction of the soft package shell and is attached to the outer wall of the soft package shell; the protruding court of second radially buckle and the laminating of soft packet of casing are in on the outer wall of soft packet of casing.

Optionally, soft packet of casing includes first half shell and second half shell, the open end of first half shell is provided with first flange, the open end of second half shell is provided with the second flange, first flange with the second flange docks and the heat-seal forms the banding.

Optionally, the banding is towards the axial of soft packet of casing is buckled and is laminated on the outer wall of soft packet of casing.

Optionally, the first projection and the second projection are both disposed on an axially outer wall of the first half shell.

Optionally, the first protrusion is integrally formed with the first half shell, and the second protrusion is integrally formed with the first half shell.

Optionally, the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, and the polarities of the first pole piece and the second pole piece are opposite; the first pole piece is provided with a first tab; and the second pole lug is led out of 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.

Optionally, a section, which is located in the soft package shell and is not provided with the first sealant, of the first tab is coated with a first tab glue; and a section, which is not provided with the second sealant, of the second tab and is positioned in the soft package shell is coated with second tab glue.

The embodiment of the utility model provides a soft-packaged button cell, first utmost point ear and second utmost point ear are drawn forth in utmost point core self axial syntropy, the outer end of first utmost point ear is drawn out the soft-packaged shell from first extraction position, the outer end of second utmost point ear is drawn out the soft-packaged shell from the second extraction position, and first extraction position and second extraction position are located the same terminal surface of the axial of soft-packaged shell, make first utmost point ear and second utmost point ear can directly be drawn out on the same terminal surface of the axial of soft-packaged shell and need not buckle many times in the soft-packaged shell, thereby first utmost point ear and second utmost point ear can not stride the utmost point core, avoid the potential safety hazard that first utmost point ear and second utmost point ear and utmost point core contact caused the internal short circuit, factor of safety has been improved, and because first utmost point ear and second utmost point ear can not stride the utmost point core and thus can not set up the spacing block, energy density has been, because the first lug and the second lug do not need to be bent for many times, the process is simpler.

Drawings

Fig. 1 is a schematic structural diagram of a soft-packaged button battery according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is a schematic structural view of a soft-packaged button battery with a folded edge and a wrinkle according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a soft-packaged button battery after flattening folds of folded edges provided by the utility model.

The reference numerals in the specification are as follows:

1. a pole piece;

2. a soft package housing; 21. a first half shell; 22. a second half shell; 23. sealing edges;

3. a first tab;

4. a second tab;

5. a first protrusion;

6. a second protrusion.

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 will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "upper", "lower", and the like, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 1-2, the soft-package button battery provided in the embodiment of the present invention includes a pole core 1 and a soft-package case 2; the pole core 1 is accommodated in a soft package shell 2;

the pole core 1 is drawn forth first utmost point ear 3 and second utmost point ear 4 that polarity is opposite along self axial syntropy, and soft packet of casing 2 is worn out from first position of drawing forth in the outer end of first utmost point ear 3, and soft packet of casing 2 is drawn forth from the second in the outer end of second utmost point ear 4, and first position of drawing forth and second are drawn forth and are located the same terminal surface of the axial of soft packet of casing 2.

Compared with the prior art, the soft package button battery provided by the embodiment of the utility model has the advantages that the first tab 3 and the second tab 4 are led out in the same axial direction of the pole core 1, the outer end of the first tab 3 is led out of the soft package shell 2 from the first lead-out position, the outer end of the second tab 4 is led out of the soft package shell 2 from the second lead-out position, and the first lead-out position and the second lead-out position are positioned on the same axial end surface of the soft package shell 2, so that the first tab 3 and the second tab 4 can be directly led out on the same axial end surface of the soft package shell 2 without being bent for multiple times in the soft package shell 2, the first tab 3 and the second tab 4 can not span the pole core 1, the potential safety hazard of internal short circuit caused by the contact of the first tab 3 and the second tab 4 with the pole core 1 is avoided, the safety factor is improved, and the first tab 3 and the second tab 4 can not span the pole core 1, so that an isolating sheet is not needed, the energy density is improved, and in addition, the first tab 3 and the second tab 4 are not required to be bent for multiple times, so that the process is simpler.

In one embodiment, as shown in fig. 1, the first lead-out position is provided with a first protrusion 5, the outer end of the first tab 3 protrudes out of the first protrusion 5, and the first tab 3 is connected with the first protrusion 5 in a sealing manner;

the second lead-out position is provided with a second bulge 6, the outer end of the second lug 4 penetrates out of the second bulge 6, and the second lug 4 is connected with the second bulge 6 in a sealing mode. The outer end of the first electrode lug 3 and the outer end of the second electrode lug 4 can be sealed after penetrating out of the soft package shell 2 through the arrangement of the first protrusion 5 and the second protrusion 6.

In an embodiment, not shown, the first protrusion is bent toward the radial direction of the soft package housing and is attached to the outer wall of the soft package housing; the second arch is radially buckled towards the soft-package shell and is attached to the outer wall of the soft-package shell. The structure size of the soft package button battery can be reduced.

In an embodiment, as shown in fig. 1 and 2, the soft pack housing 2 comprises a first half-shell 21 and a second half-shell 22, wherein the open end of the first half-shell 21 is provided with a first flange, the open end of the second half-shell 22 is provided with a second flange, and the first flange and the second flange are butted and heat-sealed to form a sealing edge 23. By providing the soft pack case 2 in a structure in which the first half case 21 and the second half case 22 are combined, it is convenient to enclose the pole core 1 in the soft pack case 2. The sealing edge 23 may function as a seal.

In an embodiment, not shown, the sealing edge 23 is bent towards the axial direction of the soft-packaged shell 2 and is attached to the outer wall of the soft-packaged shell 2. The structure size of the soft package button battery can be reduced.

In an embodiment, as shown in fig. 3, the sealing edge 23 is bent toward the axial direction of the soft package case 2 and attached to the outer wall of the soft package case 2 to form a wrinkle, and then the wrinkle is folded into the shape shown in fig. 4, so that the structural size of the soft package button battery can be reduced.

In one embodiment, as shown in fig. 1, the first projection 5 and the second projection 6 are both provided on the axial outer wall of the first half shell 21. So that the first tab 3 and the second tab 4 can be led out from the same axial end face of the soft package shell 2. Through drawing first utmost point ear 3 and second utmost point ear 4 from the same terminal surface of soft packet of axial of casing 2, can realize first utmost point ear 3 and the encapsulation respectively of second utmost point ear 4, need not to encapsulate utmost point ear and half first shell and the second shell simultaneously with traditional encapsulation mode.

In one embodiment, the first protrusion 5 is integrally formed with the first half-shell 21, and the second protrusion 6 is integrally formed with the first half-shell 21. For example, taking the first protrusion as an example, a punching pit treatment is performed on the first leading-out position of the first half shell 21, so that a part of the first half shell 21 protrudes and is punched outwards relatively, so that the first tab 3 can penetrate out, or a small hole is cut in the first leading-out position in advance, and then a punching pit is performed, an opening for the first tab 3 to penetrate out is naturally formed in the position of the punching pit, and after the first tab 3 penetrates out, the first protrusion 5 is heat-sealed, so that a sealing effect is achieved. Wherein the second protrusions 6 can also be treated in the same way.

Preferably, the depth of the punching pit is more than 2mm, so that the heat sealing treatment is conveniently carried out after the lugs (the first lug 3 and the second lug 4) are punched out.

In one embodiment, a liquid injection hole is reserved on the soft package shell 2 so as to facilitate filling of the electrolyte.

In one embodiment, the pole core 1 is formed by winding a first pole piece (not shown), a separator (not shown), and a second pole piece (not shown), the first pole piece and the second pole piece being opposite in polarity; a first tab 3 is led out of the first pole piece; the second pole piece is led out of a second pole lug 4.

In an embodiment, not shown, a first sealant (not shown) is disposed at a joint of the first tab 3 and the first pole piece, and a second sealant (not shown) is disposed at a joint of the second tab 4 and the second pole piece. The first sealant is arranged to cover the joint between the first tab 3 and the first pole piece, so that the first pole piece and the first tab 3 can be better protected. The second sealant is arranged to cover the joint between the second pole lug 4 and the second pole piece, so that the second pole piece and the second pole lug 4 can be better protected.

In one embodiment, not shown, the section of the first tab 3 located inside the soft pack housing 2 that is not provided with the first sealant is coated with a first tab glue (not shown); the section of the second tab 4, which is not provided with the second sealant and is located in the soft package shell 2, is coated with a second tab glue (not shown). The first tab glue is arranged so that the first tab 3 cannot be directly contacted with the soft package shell 2, and therefore the first tab 3 and the soft package shell 2 are prevented from being corroded by reaction; set up the second utmost point ear and glue and make second utmost point ear 4 can not direct and soft packet of casing 2 contact to prevent that second utmost point ear 4 from taking place the reaction with soft packet of casing 2 and corroding.

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. A soft package button battery is characterized by comprising a pole core and a soft package shell; the pole piece is accommodated in the soft package shell;

2. The soft-packaged button battery according to claim 1, wherein the first lead-out position is provided with a first protrusion, the outer end of the first tab penetrates out of the first protrusion, and the first tab is connected with the first protrusion in a sealing manner;

3. The soft-packaged button battery according to claim 2, wherein the first protrusion is bent toward the radial direction of the soft package shell and attached to the outer wall of the soft package shell; the protruding court of second radially buckle and the laminating of soft packet of casing are in on the outer wall of soft packet of casing.

4. The soft-packing button cell of claim 2, wherein the soft-packing case comprises a first half-shell and a second half-shell, the open end of the first half-shell is provided with a first flange, the open end of the second half-shell is provided with a second flange, and the first flange and the second flange are butted and heat-sealed to form an edge seal.

5. The soft-packaged button cell according to claim 4, wherein the sealing edge is bent towards the axial direction of the soft-packaged shell and attached to the outer wall of the soft-packaged shell.

6. The pouch button cell according to claim 4, wherein the first protrusion and the second protrusion are both provided on an axial outer wall of the first half shell.

7. The soft-packaged button cell of claim 6, wherein the first protrusion is integrally formed with the first half-shell, and the second protrusion is integrally formed with the first half-shell.

8. The soft-packaged button cell according to claim 4, wherein the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, and the first pole piece and the second pole piece have opposite polarities; the first pole piece is provided with a first tab; and the second pole lug is led out of the second pole piece.

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

10. The soft-packaged button cell according to claim 9, wherein a section of the first tab, which is located in the soft package case and is not provided with the first sealant, is coated with a first tab glue; and a section, which is not provided with the second sealant, of the second tab and is positioned in the soft package shell is coated with second tab glue.