CN211980648U

CN211980648U - Soft package lithium battery and aluminum plastic film pit punching structure thereof

Info

Publication number: CN211980648U
Application number: CN202020381486.9U
Authority: CN
Inventors: 曹礼; 周玲; 李雄成
Original assignee: Hunan Lifang New Energy Science and Technology Co Ltd
Current assignee: Hunan Lifang New Energy Science and Technology Co Ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-11-20
Anticipated expiration: 2030-03-24

Abstract

The utility model belongs to the technical field of lithium ion battery, especially, relate to a flexible package lithium cell and plastic-aluminum membrane towards hole structure, the plastic-aluminum membrane towards hole structure includes that two that form on the plastic-aluminum membrane are used for holding naked electric core the main part hole and two are used for holding gaseous air pocket hole, two the main part hole sets up along the symmetry of folding edge, two the air pocket hole sets up along the symmetry of folding edge. Compared with the prior art, the utility model discloses can solve the battery and spill over the problem at the electrolyte that the high vacuum was annotated appearance, improve the electrolyte infiltration of battery effectual.

Description

Soft package lithium battery and aluminum plastic film pit punching structure thereof

Technical Field

The utility model belongs to the technical field of lithium ion battery, especially, relate to a soft-packing lithium cell and plastic-aluminum membrane towards hole structure thereof.

Background

The lithium ion battery has the characteristics of high energy density, small volume, high voltage, environmental protection and the like, so the lithium ion battery is widely applied to portable mobile electronic finished products, portable mobile power supplies and the like; the polymer lithium ion battery with flexible package has the advantages of higher energy density, miniaturization, thinness, light weight, high safety, long cycle life and the like, and is known as the next generation lithium ion battery.

The existing flexible package lithium ion battery is packaged by adopting an aluminum-plastic film, the aluminum-plastic film is stretched by a stamping die to realize a pit punching structure, then a naked battery cell is packaged, and finally the flexible package lithium ion battery is obtained after top side sealing packaging, formation, vacuum air exhaust packaging and capacity detection.

The existing pit punching structure (as shown in fig. 1) of the aluminum-plastic film generally comprises a main body pit 1 for placing a bare cell and an air bag pit 2 for containing air, wherein two main body pits 1 are arranged, two main body pits 1 are arranged oppositely, and one air bag pit 2 is arranged. However, the electrolyte of the cell adopting the aluminum-plastic film with the pit-punching structure is not easy to be immersed into the main body at the air bag after the cell is injected with the electrolyte. At present, generally, vacuum injection or vacuum adsorption after injection is selected to improve the infiltration effect, but the injection/adsorption infiltration effect is poor under the low vacuum state, and the injection/adsorption electrolyte easily overflows under the high vacuum state, so that the injection amount is low, the electrical property of the battery cell is influenced, the battery cell is scrapped, and the appearance of the battery cell is polluted by the electrolyte. In the conventional production, in order to avoid the problem of cell liquid overflow, a mode of increasing the width of the air bag is adopted, but a large amount of aluminum plastic films are wasted.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: the aluminum-plastic film pit punching structure can solve the problem that electrolyte overflows when a battery is injected with high vacuum liquid, and improves the good electrolyte infiltration effect of the battery.

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

the utility model provides an aluminium-plastic film dashes hole structure, includes two main part holes and two air pocket holes that are used for holding gaseous that are used for holding naked electric core that form on the aluminium-plastic film, two the main part hole sets up along the symmetry of counterpolding, two the air pocket hole sets up along the symmetry of counterpolding.

As an improvement of the aluminum-plastic film pit punching structure, the depth of the air pocket pit is smaller than that of the main body pit. The depth of the air pocket pit only needs to be enough to ensure that no liquid overflow occurs, and the excessive depth of the air pocket pit can influence the positioning of a subsequent battery core and increase the risk of damage of the aluminum plastic film.

As an improvement of the aluminum-plastic film pit punching structure, the depth of the air bag pit is 1/3-2/3 of the depth of the main body pit. The air bag pit can effectively prevent the generation of overflowing liquid in the range, and can not damage the aluminum plastic film.

As an improvement of the aluminum-plastic film pit punching structure, the depth of the main body pit is 6-30 mm. The depth of the main pit can be correspondingly adjusted according to different types of battery cores.

As an improvement of the aluminum plastic film pit punching structure, the depth of the air bag pit is 2-20 mm. The depth of the air bag pit can be correspondingly adjusted according to different types of battery cores.

As an improvement of plastic-aluminum membrane towards hole structure, the bottom edge that the main part was bored sets up first arc chamfer, the radius of first arc chamfer is 0.5 ~ 2 mm. The size of first arc chamfer has decided the tensile slight degree of plastic-aluminum membrane at the die stamping in-process, sets up the radius of first arc chamfer in suitable within range can reduce the angular position damage that the plastic-aluminum membrane caused through the die drawing, improves the preparation yield of battery.

As an improvement of plastic-aluminum membrane towards hole structure, the bottom edge that the air pocket hole was bored is provided with second arc chamfer, the radius of second arc chamfer is 0.2 ~ 1 mm. The size of second arc chamfer has decided the tensile slight degree of plastic-aluminum membrane at the die stamping in-process, sets up the radius of second arc chamfer in suitable within range can reduce the angular position damage that the plastic-aluminum membrane caused through the die drawing, improves the preparation yield of battery.

As an improvement of plastic-aluminum membrane towards hole structure, the main part hole with be provided with the clearance between the air pocket hole, the clearance is 0.2 ~ 2 cm.

As an improvement of the aluminum-plastic film pit punching structure, the aluminum-plastic film is composed of a nylon layer, a metal aluminum layer and a polypropylene layer from outside to inside in sequence.

The second purpose of the invention is: the utility model provides a soft-packing lithium cell, includes naked electric core and plastic-aluminum membrane, the plastic-aluminum membrane packing is in naked electric core outside, the plastic-aluminum membrane is provided with any section before the description the plastic-aluminum membrane dash hole structure.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses the air pocket hole of the drawing formation of mould on the plastic-aluminum membrane two symmetries can have to block/storage effect to electrolyte under high vacuum state, and electrode liquid is difficult for overflowing, has improved notes liquid volume and has harmfully and electricity core outward appearance to pollute etc. unusually, improves the product quality. In addition, the utility model discloses need not increase air pocket length and also can reach the same effect with it, save the plastic-aluminum membrane.

Drawings

Fig. 1 is a schematic view of a prior art structure.

Fig. 2 is one of the schematic diagrams of the aluminum-plastic film pit punching structure of the present invention.

Fig. 3 is a second schematic view of the aluminum-plastic film pit punching structure of the present invention.

Wherein: 100-aluminum plastic film, 200-pair of folded edges, 1-main body pit, 2-air bag pit, 11-first arc-shaped chamfer and 21-second arc-shaped chamfer.

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.

Example 1

As shown in fig. 2 to 3, an aluminum-plastic film pit punching structure includes two main body pits 1 for accommodating a bare cell and two air bag pits 2 for accommodating gas, which are formed on an aluminum-plastic film 100, wherein the two main body pits 1 are symmetrically arranged along a folded edge 200, and the two air bag pits 2 are symmetrically arranged along the folded edge 200.

Further, the depth of the air pocket well 2 is smaller than that of the body well 1. Preferably, the depth of the pocket pit 2 is 1/3 to 2/3 of the depth of the main pit 1. More preferably, the depth of main pit 1 is 6 to 30 mm. The depth of the air pocket pits 2 is 2-20 mm.

Further, the bottom edge of main part hole 1 sets up first arc chamfer 11, and the radius of first arc chamfer 11 is 0.5 ~ 2 mm.

Further, the bottom edge of the air bag pit 2 is provided with a second arc-shaped chamfer 21, and the radius of the second arc-shaped chamfer 21 is 0.2-1 mm.

Furthermore, a gap is arranged between the main body pit 1 and the air bag pit 2, and the gap is 0.2-2 cm.

Further, the aluminum plastic film 100 is composed of a nylon layer, a metal aluminum layer and a polypropylene layer in sequence from outside to inside.

Example 2

The utility model provides a soft-packing lithium cell, includes naked electric core and plastic-aluminum membrane, and the plastic-aluminum membrane packing is in naked electric core outside, and the plastic-aluminum membrane is provided with the plastic-aluminum membrane of embodiment 1 and dashes hole structure.

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 an aluminium-plastic film dashes hole structure which characterized in that: including two main part holes and two air bag holes that are used for holding gaseous that are used for holding naked electric core that form on the plastic-aluminum membrane, two the main part hole sets up along the symmetry of counterpending the hem, two the air bag hole sets up along the symmetry of counterpending the hem.

2. The aluminum-plastic film pit punching structure of claim 1, wherein: the depth of the air pocket pit is smaller than the depth of the body pit.

3. The aluminum-plastic film pit punching structure of claim 1, wherein: the depth of the air pocket pit is 1/3-2/3 of the depth of the main body pit.

4. The aluminum-plastic film pit punching structure of claim 1, wherein: the depth of the main pit is 6-30 mm.

5. The aluminum-plastic film pit punching structure of claim 1, wherein: the depth of the air pocket pit is 2-20 mm.

6. The aluminum-plastic film pit punching structure of claim 1, wherein: the bottom edge of main part hole sets up first arc chamfer, the radius of first arc chamfer is 0.5 ~ 2 mm.

7. The aluminum-plastic film pit punching structure of claim 1, wherein: the bottom edge of air pocket hole is provided with second arc chamfer, the radius of second arc chamfer is 0.2 ~ 1 mm.

8. The aluminum-plastic film pit punching structure of claim 1, wherein: a gap is formed between the main body pit and the air bag pit, and the gap is 0.2-2 cm.

9. The aluminum-plastic film pit punching structure of claim 1, wherein: the aluminum-plastic film sequentially comprises a nylon layer, a metal aluminum layer and a polypropylene layer from outside to inside.

10. The utility model provides a soft-packing lithium cell, includes naked electric core and plastic-aluminum membrane, the plastic-aluminum membrane package is in naked electric core outside, its characterized in that: the aluminum-plastic film is provided with the aluminum-plastic film pit punching structure of any one of claims 1 to 9.