CN213564798U

CN213564798U - Packaging film structure for flexible packaging lithium battery

Info

Publication number: CN213564798U
Application number: CN202021277238.6U
Authority: CN
Inventors: 林正发
Original assignee: Nanjing Yuanpin Electronic Technology Co ltd
Current assignee: Nanjing Yuanpin Electronic Technology Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-06-29
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a packaging film structure for a flexible packaging lithium battery, which comprises a lithium battery packaging film and an electric core placing pit on the lithium battery packaging film, wherein the lithium battery packaging film is of a layer film body structure, the film body of the lithium battery packaging film is provided with an electric core placing pit, an air bag pit is arranged below the electric core placing pit, the electric core placing pit is provided with an electric core structure, the electric core structure is fixedly provided with a positive lug, the right side of the positive lug is provided with a negative lug, and the air bag pit is provided with an air bag structure; through forming lithium battery packaging film by nylon heat-resistant layer, aluminium foil layer, polypropylene layer, nanometer silicon layer, CPP lamination to compare the lithium battery packaging film that traditional individual layer aluminized CPP film constitutes, its performance is better, and the polypropylene layer wherein can effectually prevent the erosion of electrolyte in the battery to the aluminium foil layer moreover, thereby reaches the purpose of extension battery life.

Description

Packaging film structure for flexible packaging lithium battery

Technical Field

The utility model particularly relates to a flexible package is packaging film structure for lithium cell.

Background

With the development of modern society, various mobile devices, such as video cameras, notebook computers, portable DVDs, digital cameras, etc., are widely used, and the demand for high-energy batteries for these mobile devices is increasing. Lithium batteries have many outstanding advantages of light weight, large energy storage, large power, no pollution, long service life, small self-discharge coefficient, wide temperature adaptation range and the like, are gradually favored by people, become the best power supply of mobile equipment, and even gradually replace other traditional batteries in the fields of aviation, aerospace, navigation, automobiles, medical equipment and the like. According to the material of the packaging film, the lithium battery comprises a flexible package lithium battery and a hard shell lithium battery. The flexible package lithium battery has the advantages of small volume, light weight, flexible design and the like, and is widely applied in more and more fields at present.

But traditional flexible package lithium cell is generally the individual layer CPP film of aluminizing because the structure of its packaging film is comparatively simple present, because the separation performance of the CPP film of aluminizing is very poor, can not effectively prevent to erode the surface of aluminium foil layer because of electrolyte permeates the CPP film, causes aluminium foil layer swelling easily and partially dissolves the polyurethane glue or other binders of dry-type combined use, leads to the bonding strength of CPP film of aluminizing and aluminium foil layer to descend gradually along with the lapse of time, for this reason the utility model aims to provide a packaging film structure for flexible package lithium cell to the problem that proposes in solving above-mentioned background art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's weak point, provide a flexible packaging is packaging film structure for lithium cell to reach the purpose that improves flexible packaging battery performance.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a soft-packing is packaging film structure for lithium cell, places the hole including the electric core on lithium cell packaging film and the lithium cell packaging film, lithium cell packaging film is one deck membrane body structure, is equipped with electric core on its membrane body and places the hole, the air pocket hole has been seted up to the below that the hole was placed to electric core, electric core is placed and is provided with electric core structure in the hole, the structural fixed mounting of electric core has anodal ear, the right side of anodal ear is provided with the negative pole ear, be provided with the air pocket structure in the air pocket hole, lithium cell packaging film is formed by multilayer film structure pressfitting, and its outside-in is nylon heat-resisting layer, aluminium foil layer, polypropylene layer, nanometer silicon layer and CPP layer in proper order and constitutes, the CPP layer is the.

Preferably, the battery cell placing pit and the air bag pit are rectangular notches formed in the lithium battery packaging film through punching by a pit punching forming machine.

Preferably, the inner surface of the nano silicon layer is attached to the outer surface of the CPP layer, and the nano silicon layer is connected with the negative electrode tab.

Preferably, the surface laminating polypropylene layer setting of nanometer silicon layer, the surface laminating aluminium foil layer's on polypropylene layer internal surface setting, the surface laminating on aluminium foil layer is provided with the nylon heat-resistant layer.

Preferably, the air bag structure is in a vacuum state.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the lithium battery packaging film is formed by laminating a nylon heat-resistant layer, an aluminum foil layer, a polypropylene layer, a nano silicon layer and a CPP layer, so that the performance of the lithium battery packaging film is better than that of a lithium battery packaging film formed by a traditional single-layer aluminum-plated CPP film, and the polypropylene layer can effectively prevent electrolyte in a battery from corroding the aluminum foil layer, so that the purpose of prolonging the service life of the battery is achieved;

2. and the nano silicon layer is arranged to replace the traditional nano carbon powder or graphite to be used as the cathode material of the battery, so that the capacity of the lithium battery is greatly improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is an enlarged schematic view of the structure at B in fig. 3.

In the figure: the packaging film comprises a lithium battery packaging film 1, a battery cell placing hole 2, an air bag hole 3, a battery cell structure 4, an air bag structure 5, a positive tab 6, a negative tab 7, a nylon heat-resistant layer 8, an aluminum foil layer 9, a polypropylene layer 10, a nano silicon layer 11 and a CPP layer 12.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a packaging film structure for a flexible packaging lithium battery comprises a lithium battery packaging film 1 and a battery cell placement pit 2 on the lithium battery packaging film 1, wherein the lithium battery packaging film is of a layer film body structure, the battery cell placement pit is arranged on a film body of the lithium battery packaging film, an air bag pit 3 is formed below the battery cell placement pit 2, a battery cell structure 4 is arranged in the battery cell placement pit 2, an anode tab 6 is fixedly mounted on the battery cell structure 4, a cathode tab 7 is arranged on the right side of the anode tab 6, an air bag structure 5 is arranged in the air bag pit 3, the lithium battery packaging film 1 is formed by laminating a plurality of film structures, the lithium battery packaging film is sequentially composed of a nylon heat-resistant layer 8, an aluminum foil layer 9, a polypropylene layer 10, a nano silicon layer 11 and a CPP layer 12 from outside to inside, the CPP layer is an aluminum plating film with a thickness of 50 microns, and the lithium battery packaging film 1, The CPP layer 12 is formed by pressing, so that the performance of the packaging film is better compared with a lithium battery packaging film formed by a traditional single-layer aluminized CPP film.

Furthermore, the battery core placing pit 2 and the air bag pit 3 are both rectangular notches formed in the lithium battery packaging film 1 by punching through a pit punching forming machine, and the integrated pit body structure formed by punching can reduce the sealing position of the battery packaging film, so that the risk of electrolyte leakage is reduced;

furthermore, the inner surface of the nano silicon layer 11 is attached to the outer surface of the CPP layer 12, the nano silicon layer 11 is connected with the negative electrode tab 7, and the nano silicon layer 11 is arranged to replace the traditional nano carbon powder or graphite to be used as the negative electrode material of the battery, so that the purpose of greatly improving the capacity of the lithium battery is achieved;

furthermore, the outer surface of the nano silicon layer 11 is attached to the polypropylene layer 10, the outer surface of the polypropylene layer 10 is attached to the inner surface of the aluminum foil layer 9, the outer surface of the aluminum foil layer 9 is attached to the nylon heat-resistant layer 8, and the aluminum foil layer 9 can be effectively prevented from being corroded by electrolyte in the battery through the polypropylene layer 10, so that the purpose of prolonging the service life of the battery is achieved;

furthermore, the air bag structure 5 is in a vacuum state, and the phenomenon of electrolyte leakage caused by long-time use of the lithium battery due to air inflation is reduced through the air bag.

The working principle is as follows: through 1 by nylon heat-resistant layer 8 with lithium cell packaging film, aluminium foil layer 9, polypropylene layer 10, nanometer silicon layer 11, CPP layer 12 pressfitting forms, thereby compare the lithium cell packaging film that traditional individual layer aluminized CPP film constitutes, its performance is better, wherein polypropylene layer 10 can effectually prevent the erosion of electrolyte in the battery to aluminium foil layer 9, thereby reach the purpose of extension battery life, and replace traditional nanometer carbon dust or graphite as the cathode material of battery through setting up nanometer silicon layer 11, thereby increase substantially the capacity of lithium cell, thereby let the electric capacity of battery higher.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a hole (2) is placed to electric core on soft-packing lithium cell and the lithium cell packaging film (1), its characterized in that for the flexible package lithium cell, including lithium cell packaging film (1): lithium battery packaging film is one deck diaphragm structure, and it places the hole to be equipped with electric core on its diaphragm, air pocket hole (3) have been seted up to the below that hole (2) was placed to electric core, electric core is provided with electric core structure (4) in placing hole (2), fixed mounting has anodal ear (6) on electric core structure (4), the right side of anodal ear (6) is provided with negative pole ear (7), be provided with air pocket structure (5) in air pocket hole (3), lithium battery packaging film (1) is formed by multilayer film structure pressfitting, and it outside-in is nylon heat-resistant layer (8), aluminium foil layer (9), polypropylene layer (10), nano silicon layer (11) and CPP layer (12) in proper order and constitutes, the CPP layer is the CPP aluminized film that one deck thickness is 50 microns.

2. The packaging film structure for a lithium battery with a flexible package according to claim 1, wherein: the battery core placing pit (2) and the air bag pit (3) are rectangular notches formed in the lithium battery packaging film (1) through punching by a pit punching forming machine.

3. The packaging film structure for a lithium battery with a flexible package according to claim 1, wherein: the inner surface of the nano silicon layer (11) is attached to the outer surface of the CPP layer (12), and the nano silicon layer (11) is connected with the negative electrode tab (7).

4. The packaging film structure for a lithium battery with a flexible package according to claim 3, wherein: the surface laminating polypropylene layer (10) of nanometer silicon layer (11) sets up, the internal surface setting of the surface laminating aluminium foil layer (9) of polypropylene layer (10), the surface laminating of aluminium foil layer (9) is provided with nylon heat-resistant layer (8).

5. The packaging film structure for a lithium battery with a flexible package according to claim 1, wherein: the air bag structure (5) is in a vacuum-pumping state.