CN201942178U

CN201942178U - Soft packaging film for lithium battery

Info

Publication number: CN201942178U
Application number: CN201120045361XU
Authority: CN
Inventors: 吕方龙; 杨彦平; 戴晓兵
Original assignee: ZHUHAI SAIRI PACKAGING MATERIAL CO Ltd
Current assignee: ZHUHAI SAIRI PACKAGING MATERIAL CO Ltd
Priority date: 2011-02-23
Filing date: 2011-02-23
Publication date: 2011-08-24
Anticipated expiration: 2021-02-23

Abstract

The utility model discloses a soft packaging film for lithium battery, and provides a soft packaging film for lithium battery having water resistance, humidity-resistance, sealing performance, insulating performance, good electrolyte resistance and good puncture resistance. The soft packaging film for lithium battery comprises an aluminum foil layer (1), a polyamide protective layer (2) and a tape casting polypropylene heat-seal layer (3). The polyamide protective layer (2) is dry compounded with the outer surface of the aluminum foil layer (1), and the tape casting polypropylene heat-seal layer (3) is dry compounded with the inner surface of the aluminum foil layer (1). The utility model can be widely used in the lithium battery package field.

Description

A kind of lithium cell flexible packaging film

Technical field

The utility model relates to a kind of lithium cell flexible packaging film.

Background technology

Three phases has been experienced in the development of lithium cell, it at first is the lithium cell of box hat packing, be the lithium cell of aluminum hull packing afterwards, the flexible package lithium cell that uses is a third generation product at present, because flexible package lithium cell has advantages such as capacity is big, in light weight, volume is little, safety is good, has become the developing direction of lithium cell.At present, the patent No. is that the Chinese patent of ZL99212336 discloses a kind of lithium battery flexible packaging film, it is based on aluminium lamination, the aluminium lamination outside face is the polyethylene terephthalate layer, inside face applies low density polyethylene layer, on low density polyethylene layer, apply one deck ethene-(methyl) acrylic copolymer layer again, low density polyethylene layer enough becomes internal layer jointly with ethene-(methyl) acrylic copolymer layer, but it must be earlier cold stamping shaped when lithium cell is packed, thereby improve the apparent property of battery, the tightness of heat-sealing mouth, the outer polyethylene terephthalate layer that adopts, its tensile property is bad, cold stamping is bad, aluminium lamination is too thin also be unfavorable for cold stamping shaped, this just exists certain inconvenience, simultaneously, Technical Development Requirement is the bigger battery of use capacity in littler space, packing to battery have also proposed thinner meticulousr requirement so equally, and lithium battery flexible packaging film developing direction from now on is that thickness is thinner, quality is littler, the electrolyte resistance stability is good, the barrier height, the cold stamping shaped degree of depth is bigger, puncture resistance is more excellent, heat seal strength is higher, the electrical property influence is littler, safety is more high.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of energy waterproof and dampproof, can guarantee leak tightness and the reasonable lithium cell flexible packaging film of insulativity, electrolyte resistance and puncture resistance.

The technical scheme that the utility model adopted is: the utility model comprises aluminium foil layer, protective polyamide layer, cast polypropylene hot sealing layer; described protective polyamide layer dry type is compound to the outside face of described aluminium foil layer, and described cast polypropylene hot sealing layer dry type is compound to the inside face of described aluminium foil layer.

The thickness of described protective polyamide layer is 7-15 microns, and the thickness of described aluminium foil layer is the 20--25 micron, and the thickness of described cast polypropylene hot sealing layer is the 20--30 micron.

The beneficial effects of the utility model are: because the utility model comprises aluminium foil layer; protective polyamide layer; the cast polypropylene hot sealing layer; described protective polyamide layer dry type is compound to the outside face of described aluminium foil layer; described cast polypropylene hot sealing layer dry type is compound to the inside face of described aluminium foil layer; through the above-mentioned described aluminium foil layer that processes; described protective polyamide layer; the densification of described polypropylene thermal seal does not have hole; can intercept passing through of air moisture; and use outside face to use described protective polyamide layer; easily broken in the cold stamping shaped rear portion of described aluminium foil layer, so the utility model can be waterproof and dampproof; can guarantee leak tightness and insulativity; electrolyte resistance and puncture resistance are relatively good.

Because the thickness of described protective polyamide layer is 7-15 microns; the thickness of described aluminium foil layer is the 20--25 micron; the thickness of described polypropylene thermal seal is the 20--30 micron; so can reaching with flexible packaging film, the described lithium cell of making is lower than 70 microns and ultra-thin; thickness is thinner, quality is littler; the bigger battery of use capacity in littler space has bigger capacity so the utility model can guarantee battery in certain space.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The specific embodiment

As shown in Figure 1; the utility model is a kind of lithium cell flexible packaging film; it comprises with aluminium foil layer 1 protective polyamide layer 2, cast polypropylene hot sealing layer 3; described aluminium foil layer 1 is as basal layer; use the compound mode of dry type described protective polyamide layer 2 to be compound to the outside face of described aluminium foil layer 1; and then the compound described cast polypropylene hot sealing layer 3 of dry type is to the inside face of described aluminium foil layer 1; the thickness of described protective polyamide layer 2 is 7-15 microns; the thickness of described aluminium foil layer 1 is the 20--25 micron, and the thickness of described cast polypropylene hot sealing layer 3 is the 20--30 micron.

Following example cites an actual example the characteristics of written or printed documents utility model is described; Described protective polyamide layer 2 employing thickness are 7 microns nylon membrane; described aluminium foil layer 1 used thickness is 25 microns a soft attitude aluminium foil; described polypropylene thermal seal 3 used thicknesses are 25 microns polypropylene screen; the gross thickness of product is 57 microns; be lower than 70 millimeters thick; can can guarantee that battery has bigger capacity in certain space; the peel strength of testing product cast polypropylene film/soft attitude aluminium foil is 70N/ 15mm; initial heat seal strength is 60 N/ 15mm, and water vapor barrier can be 60 ℃, 90%RH, water vapour permeability＜20ppm after 336 hours.

The utility model can be widely used in the lithium cell packaging field.

Claims

1. lithium cell flexible packaging film; it comprises aluminium foil layer (1); it is characterized in that: described lithium cell also comprises protective polyamide layer (2), cast polypropylene hot sealing layer (3) with flexible packaging film; protective polyamide layer (2) dry type is compound to the outside face of described aluminium foil layer (1), and described cast polypropylene hot sealing layer (3) dry type is compound to the inside face of described aluminium foil layer (1).

2. a kind of lithium cell flexible packaging film according to claim 1; it is characterized in that: the thickness of described protective polyamide layer (2) is 7-15 microns; the thickness of described aluminium foil layer (1) is the 20--25 micron, and the thickness of described cast polypropylene hot sealing layer (3) is the 20--30 micron.