CN215497000U

CN215497000U - L-shaped tab for buckle type flexible package battery cell

Info

Publication number: CN215497000U
Application number: CN202121639403.2U
Authority: CN
Inventors: 戈志敏; 李维义; 高杨; 肖海燕; 王永伟
Original assignee: Xinyu Ganfeng Electronics Co Ltd
Current assignee: Xinyu Ganfeng Electronics Co Ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-01-11
Anticipated expiration: 2031-07-19

Abstract

The utility model discloses an L-shaped tab for a button type flexible package battery cell, which belongs to the technical field of battery manufacture and comprises the following components: the tab metal belt, the first tab adhesive tape and the second tab adhesive tape are arranged in parallel and level with one end of the second tab adhesive tape. The first tab adhesive tape can be protected on the outer side of the L-shaped tab and cannot be tilted like tab protection adhesive paper pasted on a conventional tab, so that the metal belt of the tab can be effectively prevented from being exposed, the metal belt of the tab is prevented from contacting with the inner side of the aluminum-plastic film shell, and the damage or electrochemical corrosion leakage of the aluminum-plastic film is prevented.

Description

L-shaped tab for buckle type flexible package battery cell

Technical Field

The utility model belongs to the technical field of battery manufacturing, and particularly relates to an L-shaped tab for a button type flexible package battery cell.

Background

The tabs used by flexible package battery cores in the industry are basically made by drawing one or more tab metal strips side by side into parallel lines at equal intervals in the same plane, and then drawing two special insulating tapes (Sealant) perpendicular to the metal strips on two side surfaces of the tab metal strips parallel to each other, wherein the insulating tapes (Sealant) are usually PP or a composite tape of PE and PC, and are called tab adhesives. And then, the tab glue is welded on the two side surfaces of the metal belt in a hot welding mode, and then the tab glue is punched and cut at a certain width from the two edges of the metal belt to form the middle-shaped tabs at equal intervals. The formed electrode lug is often made into different shapes according to different purposes.

The pole ear used by the power battery is generally wide in metal band, and is usually cut into a section, and each section is a single pole ear shaped like a Chinese character 'zhong'; for the pole ear used by digital or blue tooth battery, the metal belt is usually not cut off, a coil of metal belt is hot-melted with a plurality of series-connected pole ear glue in the shape of Chinese character 'zhong' according to a certain distance, and the pole ear glue is coiled into a disk type pole ear coil. The tab coil coiled into a coil is very convenient for the use of automatic battery production equipment.

The tab tapes used in the conventional tabs are generally manufactured by aligning two tab tapes (Sealant) with equal width, sandwiching a metal tape therebetween, and heating and pressurizing the metal tape to manufacture tabs used for the conventional batteries. However, when the tab is bent into a U shape before the battery cell is packaged, the adhesive tapes on the two sides of the metal strip are tilted, so that the U-shaped metal strip is exposed. After the battery cell is packaged, the exposed metal strip of the section U contacts with the inner side of the aluminum-plastic film shell, so that the aluminum-plastic film is damaged, and the aluminum-plastic film may be cracked. Therefore, the battery negative electrode lug is conducted with the aluminum layer of the packaging film aluminum-plastic film, so that the electrochemical corrosion of the aluminum layer of the finished battery aluminum-plastic film is caused, and the battery leakage is caused.

Therefore, how to provide an L-shaped tab for a buckle-type flexible package battery cell is a problem that needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an L-shaped tab for a buckle-type flexible package battery cell, wherein a first tab adhesive tape is protected on the outer side of the L-shaped tab and does not tilt like tab protection adhesive tape attached to a conventional tab, so as to effectively prevent the tab metal belt from being exposed, prevent the tab metal belt from contacting with the inner side of an aluminum plastic film casing, and prevent the aluminum plastic film from being damaged or leaking electrochemical corrosion.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an L-shaped tab for a button-type flexible package battery cell, comprising: utmost point ear strap, first utmost point ear sticky tape and second utmost point ear sticky tape, wherein, the width of first utmost point ear sticky tape is greater than the width of second utmost point ear sticky tape, first utmost point ear sticky tape with second utmost point ear sticky tape hot melt respectively connects the both sides of utmost point ear strap, just first utmost point ear sticky tape with the one end parallel and level of second utmost point ear sticky tape.

Preferably, the difference between the width of the second tab adhesive tape and the width of the first tab adhesive tape is 1.5-5.0 mm.

Preferably, the first tab tape and the second tab tape are provided in a plurality of pairs, each pair being disposed at equal intervals in a length direction of the tab metal strip.

Preferably, the top edge of the first tab tape is welded against the side edge of the pole piece, and the first tab tape is welded toward the side of the pole piece that is inward when wound and the second tab tape is welded toward the side of the pole piece that is outward when wound.

Preferably, the L-shaped tab is welded in the pole piece hollow foil area.

Preferably, after the L-shaped tab is welded with the pole piece, the exposed metal belt at the root of the L-shaped tab is completely coated by the insulating adhesive tape.

Preferably, the L-shaped tab is welded into a winding core wound by the pole piece, when the tab is folded, the L-shaped tab is folded into a U shape from the junction of the first tab adhesive tape and the second tab adhesive tape, and the folded first tab adhesive tape is in single layer to protect the outer side of the U-shaped tab metal band so as to protect the tab metal band.

The utility model has the beneficial effects that:

the first tab adhesive tape can be protected on the outer side of the L-shaped tab and cannot be tilted like tab protection adhesive paper pasted on a conventional tab, so that the metal belt of the tab can be effectively prevented from being exposed, the metal belt of the tab is prevented from contacting with the inner side of the aluminum-plastic film shell, and the damage or electrochemical corrosion leakage of the aluminum-plastic film is prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a front view of the present invention.

Figure 2 the accompanying drawing is a top view of the utility model.

Fig. 3 is a front view of the L-shaped tab and the pole piece in the utility model.

Fig. 4 is a side view of the L-shaped tab and pole piece weld of the present invention.

Fig. 5 is a front view showing the winding core wound with the L-shaped tab of the utility model.

Fig. 6 is a top view of the winding core for winding the L-shaped tab of the utility model.

Fig. 7 is a front view of the L-shaped tab winding core after the tab is folded.

Fig. 8 is a top view of the L-shaped tab winding core after the tab is folded.

Wherein, in the figure:

1-a first tab tape; 2-second ear of polar tape; 3-tab metal band; 4-pole piece; 41-pole piece material area; 42-pole piece empty foil area; 5-a separator; 6-rolling the core body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides an L-shaped tab for a buckle-type flexible package battery cell, comprising: utmost point ear strap 3, first utmost point ear sticky tape 1 and second utmost point ear sticky tape 2, wherein, the width of first utmost point ear sticky tape 1 is greater than the width of second utmost point ear sticky tape 2, and first utmost point ear sticky tape 1 and second utmost point ear sticky tape 2 hot melt respectively connect in the both sides of utmost point ear strap 3, and the one end parallel and level of first utmost point ear sticky tape 1 and second utmost point ear sticky tape 2.

In this embodiment, the difference between the width of the second tab tape 2 and the width of the first tab tape 1 is 1.5-5.0 mm.

In this embodiment, the first tab tape 1 and the second tab tape 2 are provided in a plurality of pairs, each pair being disposed at equal intervals in the length direction of the tab metal strip 3.

In this embodiment, the top edge of the first tab tape 1 is welded against the side edge of the pole piece 4, as shown in fig. 3-4; and the first tab tape 1 is wound toward the pole piece 4 on the inward side and the second tab tape 2 is welded toward the pole piece 4 on the outward side, as shown in fig. 5 to 6.

In this embodiment, the L-shaped tab is welded in the pole piece empty foil area 42, and one side of the pole piece empty foil area 42 is the pole piece material area 41.

In this embodiment, after the L-shaped tab is welded to the pole piece 4, the exposed metal strip at the root of the L-shaped tab is completely covered with the insulating tape, so as to prevent short circuit caused by welding marks or burrs of the tab piercing the diaphragm 5 after the tab is wound.

For the conventional pole lugs with the same height as the pole lug glue blocks (Sealant) on the two sides, a section of pole lug metal belt 3 is exposed when being welded with the pole piece 4, and the section of metal belt is required to be protected from the two sides by an insulating adhesive tape after welding. However, when the tab is bent into a U shape before the battery cell is packaged, the adhesive tapes protecting the two sides of the tab metal strip 3 may be tilted, so that the tab metal strip 3 folded into a U shape is exposed. After the battery cell is packaged, the exposed metal strip of the section U contacts with the inner side of the aluminum-plastic film shell, so that the aluminum-plastic film is damaged, and the aluminum-plastic film may be cracked. Therefore, the battery negative electrode lug is conducted with the aluminum layer of the packaging film aluminum-plastic film, so that the electrochemical corrosion of the aluminum layer of the finished battery aluminum-plastic film is caused, and the battery leakage is caused.

As shown in fig. 7-8, the utility model uses L-shaped tab to weld into a roll core 6 wound by pole piece 4, when folding the tab, the L-shaped tab is folded into U shape from the juncture of the first tab adhesive tape 1 and the second tab adhesive tape 2, the folded first tab adhesive tape 1 is protected at the outside of the U-shaped tab metal belt 3 in a single layer, the tab metal belt 3 is protected, instead of the conventional tab which is folded and then the tab protective adhesive paper is tilted to expose the metal belt outside. Therefore, the problems of aluminum plastic film damage or electrochemical corrosion liquid leakage or poor side voltage caused by extrusion of the lug metal belt 3 on the inner side of the aluminum plastic film shell after the battery core is packaged can be effectively prevented.

The L-shaped tab applied and protected by the patent of the utility model has the greatest difference from the conventional tab that two conventional tab adhesive tapes with the same height are changed into two tab adhesive tapes with different heights. The height difference of the two tab adhesive tapes is 1.5-5.0 mm, and is specifically determined according to the application and the cell structure of the L-shaped tab.

After the tabs are folded, the first tab adhesive tape 1 can be protected on the outer side of the L-shaped tabs and cannot be tilted like tab protection adhesive paper pasted on a conventional tab, so that the tab metal belt 3 can be effectively prevented from being exposed, the tab metal belt 3 is prevented from contacting with the inner side of the aluminum-plastic film shell, and the damage or electrochemical corrosion leakage of the aluminum-plastic film is prevented.

The L-shaped tab is very suitable for being used on the button type TWS miniature soft package battery cell. Because the volume space of the button type TWS battery cell is small, the battery cell is often subjected to radial extrusion after the edge is folded. If the conventional tab adhesive tape is adopted, two tab adhesive tapes with equal heights are fused together, are thick and hard and cannot be bent, the tab can only be bent from the lower edge of a tab block pasted with protective adhesive paper when being folded, and the tab protective adhesive paper is easily tilted when being bent, so that a metal belt is exposed.

However, when the L-shaped tab is folded, a raised single-sided tab adhesive tape is provided, and the single-sided tab adhesive tape is hot-melted on the tab metal belt 3, so that the tab adhesive tape is easier to bend relative to the double-sided tab. Therefore, when the tab is folded, the tab can be bent from the single-sided tab adhesive tape, so that the single-sided tab adhesive tape is bent outwards to protect the outer side of the tab metal belt 3 at the bent position. The single-side tab adhesive tape is thicker than conventional tab protective adhesive paper and is not easy to warp, so that the single-side tab adhesive tape is very suitable for producing the button TWS miniature cell.

The L-shaped tab of the utility model has no other big difference with the conventional tab in processing technique except that the raw material uses two tab adhesive tapes with different widths, so the cost is not much different from the conventional tab, and the L-shaped tab is a tab with simple structure but very high application value and is very suitable for producing a button type soft package battery cell.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a L shape utmost point ear for detaining flexible package electricity core which characterized in that includes: utmost point ear strap, first utmost point ear sticky tape and second utmost point ear sticky tape, wherein, the width of first utmost point ear sticky tape is greater than the width of second utmost point ear sticky tape, first utmost point ear sticky tape with second utmost point ear sticky tape hot melt respectively connects the both sides of utmost point ear strap, just first utmost point ear sticky tape with the one end parallel and level of second utmost point ear sticky tape.

2. The L-shaped tab for the button-type flexible package battery cell according to claim 1, wherein the difference between the width of the second tab tape and the width of the first tab tape is 1.5-5.0 mm.

3. The L-shaped tab for the button-type flexible packaging battery cell as claimed in claim 1, wherein the first tab tape and the second tab tape are provided in a plurality of pairs, each pair being disposed at equal intervals along the length direction of the tab metal tape.

4. The L-shaped tab of claim 1 wherein the first tab tape is welded at its top edge against the side edge of the pole piece and the first tab tape is wound toward the pole piece on the side facing inward and the second tab tape is welded on the side facing outward.

5. The L-shaped tab for a button-type flexible packaging electric core according to claim 4, wherein the L-shaped tab is welded in the pole piece hollow foil area.

6. The L-shaped tab for the button-type flexible package battery cell according to claim 5, wherein the L-shaped tab is welded with the pole piece, and the exposed metal strip at the root of the L-shaped tab is completely covered by an insulating tape.

7. The L-shaped tab for the button-type flexible package battery cell according to claim 4, wherein the L-shaped tab is welded into a roll core wound by a pole piece, when the tab is folded, the L-shaped tab is folded into a U shape from the junction of the first tab adhesive tape and the second tab adhesive tape, and the folded first tab adhesive tape is protected at the outer side of the U-shaped tab metal strip in a single layer to protect the tab metal strip.