CN217485672U

CN217485672U - Soft package button cell packaging structure and cell containing same

Info

Publication number: CN217485672U
Application number: CN202220780504.XU
Authority: CN
Inventors: 余志�; 乐红春; 黄波; 刘双飞; 张振; 王传宝
Original assignee: Dongguan Liwinon Energy Technology Co ltd
Current assignee: Dongguan Liwinon Energy Technology Co ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-09-23
Anticipated expiration: 2032-04-06

Abstract

The utility model relates to the technical field of batteries, concretely relates to soft-packaged button cell packaging structure, including the core that rolls up that positive plate, negative pole piece and diaphragm coiling formed, the smooth foil department of positive plate and negative pole piece all extends there is first utmost point ear, and two first utmost point ears all weld have a second utmost point ear, and the welding part of first utmost point ear and second utmost point ear is hugged closely in rolling up the core. The first tab is the optical foil part of the positive and negative pole pieces, and the optical foil part is thin and soft in material, so that the problem that the tab glue is moved outwards due to the opening and springback of the bent part in the prior art is solved, the utilization space of the battery in the diameter direction is increased, and the energy density of the battery is improved; in addition, the problem of corrosion and leakage caused by the fact that the aluminum plastic film is easily broken by the protruding part of the bending point of the first bending part after the tab is bent twice in the prior art is solved. Furthermore, the utility model discloses still disclose a battery that contains above-mentioned soft packet of button cell packaging structure.

Description

Soft package button cell packaging structure and cell containing same

Technical Field

The utility model relates to the technical field of batteries, concretely relates to soft-packaged button cell packaging structure and contain battery of this structure.

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) Light weight, high energy density: soft-pouch cells weigh 40% less than steel-can cells of equivalent capacity and 20% less than aluminum-can cells, and therefore generally have higher energy densities.

(3) Good electrochemical performance and long service life: 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.

Along with the rise of wearable equipment, the demand for high-energy-density soft package button cells is increasing day by day, and button cells with the characteristics of simple process, low equipment investment, high cost performance and the like are concerned by people, and the demand is increased. At present, button cell generally because of the requirement of its structure and encapsulation nature, its metal tab needs 2 times to buckle and encapsulates again, because the symmetry of its utmost point ear, the thickness space of two-layer strap has additionally been increased, lead to the corresponding reduction of the diameter of rolling up the core, be unfavorable for its energy density's promotion, utmost point ear metal is after buckling simultaneously, there is the resilience that opens of certain degree, the position that leads to utmost point ear to glue moves outward, when the encapsulation, there is certain probability can cause the encapsulation badly, current utmost point ear is harder (thickness far than the foil), utmost point ear bends twice after, the bulge can appear at first bending position bending point, cause the broken plastic-aluminum membrane in top easily like this, thereby lead to corroding the problem of weeping.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: in order to solve the problems of the prior art, the structure adopts the optical foils of the positive and negative pole pieces as the pole lugs, and the optical foils are bent and welded with the pole lugs glued with the metal strip pole lugs for packaging, so that the utilization space in the diameter direction of the battery is increased, the energy density of the battery is improved, the poor packaging can be greatly reduced, the yield of the battery is improved, and the production cost is reduced; meanwhile, the first fold is that the metal foil is soft, and does not protrude to burst the aluminum plastic film to cause liquid leakage.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a soft packet of button cell packaging structure, includes the core that positive plate, negative pole piece and diaphragm were convoluteed and are formed, the positive plate with the plain foil department of negative pole piece all extends there is first utmost point ear, two first utmost point ear all has welded a second utmost point ear, first utmost point ear with the welded part of second utmost point ear hugs closely in roll core. The first tab is the optical foil part of the positive and negative pole pieces, and the optical foil part is thin and soft in material, so that the problem of outward movement of a tab glue position caused by opening and springback of a bent part in the prior art is solved, the utilization space of the diameter direction of the battery is increased, and the energy density of the battery is improved; in addition, the problem of corrosion and leakage caused by the fact that the aluminum-plastic film is easily burst by the protruding part of the bending point of the first bending part after the tab is bent twice in the prior art is solved. The utility model discloses greatly reduced encapsulates badly, promotes the yield of battery, has reduced manufacturing cost.

As an improvement of soft package button cell packaging structure, two first utmost point ear perpendicular buckle respectively in the positive plate with the coating district of negative pole piece, the coating district with the junction of first utmost point ear is pasted and is had first insulation adhesive tape.

As a soft packet of button cell packaging structure's an improvement, the second utmost point ear includes weld part and perpendicular to the utmost point ear extension of weld part, the weld part is pasted and is had the second insulated paper, utmost point ear extension is being close to in the position of weld part bonds and has utmost point ear glue.

As an improvement of the soft package button cell packaging structure, the first tab and the second tab are welded by ultrasonic waves.

As an improvement of the soft package button cell packaging structure of the utility model, the thickness of the first tab is 5-12 μm.

As an improvement of the soft package button cell packaging structure of the utility model, the thickness of the first tab is 8-12 μm.

As an improvement of the soft package button cell packaging structure of the utility model, the thickness of the first tab is 5-10 μm.

As a soft packet of button cell packaging structure's an improvement, first utmost point ear with the weld part of second utmost point ear with it is insulating through the third insulated paper winding to roll up the core.

Another object of the utility model is to provide a battery that contains foretell laminate polymer button cell packaging structure, including the plastic-aluminum membrane, encapsulate above-mentioned packaging structure in the plastic-aluminum membrane, the utmost point ear extension of second utmost point ear expose in outside the plastic-aluminum membrane, first utmost point ear wrap up in the plastic-aluminum membrane.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided to explain the invention and not to constitute an undue limitation on the invention. In the drawings:

fig. 1 is a schematic structural view of a first tab and a coating region according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of the welding of the first tab and the second tab according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 4 is an enlarged view of a point a in fig. 3.

Fig. 5 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 6 is an enlarged view of fig. 5 at B.

Fig. 7 is a second schematic structural view of embodiment 2 of the present invention.

The manufacturing method comprises the following steps of 1-first bending part, 2-second bending part, 3-winding core, 4-first tab, 5-second tab, 6-coating area, 7-first insulation adhesive paper, 8-welding part, 9-tab extending part, 10-second insulation paper, 11-tab adhesive and 12-aluminum plastic film.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, 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, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to 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 present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.

Detailed description of the preferred embodiment 1

As shown in fig. 1-4, a soft-package button cell packaging structure comprises a winding core 3 formed by winding a positive plate, a negative plate and a diaphragm, wherein first tabs 4 extend from optical foils of the positive plate and the negative plate, two first tabs 4 are welded with a second tab 5, and the welded parts of the first tabs 4 and the second tabs 5 are tightly attached to the winding core 3. The two first tabs 4 are respectively vertically bent in the coating areas 6 of the positive plate and the negative plate, and first insulating gummed paper 7 is pasted at the joint of the coating areas 6 and the first tabs 4. The second tab 5 includes a welding portion 8 and a tab extension portion 9 perpendicular to the welding portion 8, the second insulation paper 10 is adhered to the welding portion 8, and a tab glue 11 is adhered to the tab extension portion 9 at a position close to the welding portion 8.

The above structure is realized by: firstly, preparing a positive and negative electrode coil stock by batching, coating, rolling and splitting in sequence according to the normal production flow of the lithium ion battery, wherein when coating of positive and negative electrode plates is designed, a certain length of smooth foil needs to be reserved for the positive and negative electrode plates to serve as a first tab 4; then, bending the metal optical foils of the positive and negative pole pieces by 90 degrees, gluing, winding the metal optical foils with the diaphragm into a cylindrical winding core 3, and enabling the metal optical foils of the positive and negative pole pieces to serve as first tabs 4; then, bending the first tab 4 of the metal plain foil of the cylindrical winding core 3 outwards by 90 degrees, preparing a second tab 5, bending the second tab 5 by 90 degrees in advance near the root of the tab glue 11, and welding the first tab 4 and the second tab 5 together by using ultrasonic waves and gluing the first tab 4 and the second tab 5 after bending; and finally, forming the soft package button cell packaging structure with the structure.

Wherein, at first carry out 90 bending earlier with the metal smooth foil of positive and negative pole piece and belong to first action of bending, then carry on again after welding first utmost point ear 4 and second utmost point ear 5 with roll up 3 laminating of core and belong to the second action of bending, as shown in fig. 3, first department of bending 1 and second department of bending 2 have laminated with roll up 3 well, the problem of the gluey position of utmost point ear that leads to because of the opening resilience of prior art kink shifts outward and breaks the plastic-aluminum membrane has been avoided, the utilization space of battery diametral direction has been increased like this, promote the energy density of battery, reduce and encapsulate badly, promote the yield of battery, and the production cost is reduced.

Preferably, the first tab 4 and the second tab 5 are welded by ultrasonic waves, but the first tab 4 and the second tab 5 may also be welded by other means, such as laser welding.

Preferably, the thickness of the first tab 4 is 5-12 μm, and when the first tab 4 is a part of a positive electrode sheet, the thickness is generally selected to be 8-12 μm, and when the first tab 4 is a part of a negative electrode sheet, the thickness of the first tab 4 is 5-10 μm. The thickness is selected to enable the tab to be easily bent and have small resilience, so that the problem of poor packaging caused by resilience after the tab is bent can be avoided during packaging.

Preferably, the welding portions of the first tab 4 and the second tab 5 are insulated from the jelly roll 3 by a third insulation paper coil, so that good insulation is provided between the welding portions and the jelly roll 3.

Detailed description of the preferred embodiment 2

As shown in fig. 1 to 7, a battery including the soft package button cell package structure of embodiment 1 includes an aluminum-plastic film 12, the package structure of embodiment 1 is packaged in the aluminum-plastic film 12, a tab extending portion 9 of a second tab 5 is exposed outside the aluminum-plastic film 12, and a first tab 4 is wrapped in the aluminum-plastic film 12. After the packaging, the battery core is subjected to a series of processes such as baking, liquid injection, formation, degassing and edge sealing, capacity grading, OCV (open circuit voltage control) and appearance size detection, and the finished product of the soft package button battery is prepared.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a soft packet of button cell packaging structure which characterized in that: the winding core comprises a positive plate, a negative plate and a diaphragm, wherein the winding core is formed by winding, the positive plate and the optical foil of the negative plate extend to form a first pole lug and a second pole lug, the first pole lug is welded to form the second pole lug, and the welding part of the first pole lug and the second pole lug is tightly attached to the winding core.

2. The soft-package button cell packaging structure of claim 1, wherein: the two first tabs are respectively vertically bent in the coating areas of the positive plate and the negative plate, and first insulating adhesive tapes are adhered to the joint of the coating areas and the first tabs.

3. The soft-package button cell packaging structure according to claim 1 or 2, characterized in that: the second utmost point ear includes weld part and perpendicular to the utmost point ear extension of weld part, the weld part is pasted and is had the second insulated paper, utmost point ear extension is in being close to the position bonding of weld part has utmost point ear to glue.

4. The soft-package button cell packaging structure of claim 1, wherein: the first pole lug and the second pole lug are welded through ultrasonic waves.

5. The soft-package button cell packaging structure of claim 1, wherein: the thickness of the first tab is 5-12 μm.

6. The soft-package button cell packaging structure of claim 5, wherein: the thickness of the first tab is 8-12 μm.

7. The soft-package button cell packaging structure of claim 5, wherein: the thickness of the first tab is 5-10 μm.

8. The soft-package button cell packaging structure of claim 1, wherein: and the welding parts of the first tab and the second tab are insulated from the winding core by a third insulating paper winding.

9. A battery comprising the pouch button cell packaging structure according to any one of claims 1 to 8, wherein: the packaging structure comprises an aluminum plastic film, the soft-packaged button cell packaging structure of any one of claims 1-8 is packaged in the aluminum plastic film, a tab extending part of the second tab is exposed out of the aluminum plastic film, and the first tab is packaged in the aluminum plastic film.