CN202528520U

CN202528520U - Aluminum plastic packaging film for lithium ion battery

Info

Publication number: CN202528520U
Application number: CN201220100114XU
Authority: CN
Inventors: 欧阳少波; 陈宇新; 吴明选; 陈立宝
Original assignee: Dongguan Everlast Packing Science & Technology Co Ltd
Current assignee: Dongguan Everlast Packing Science & Technology Co Ltd
Priority date: 2012-03-16
Filing date: 2012-03-16
Publication date: 2012-11-14
Anticipated expiration: 2022-03-16

Abstract

The utility model discloses an aluminum plastic packaging film for a lithium ion battery. The aluminum plastic packaging film has a layer structure and comprises a protective layer, an adhesive layer, a coating layer, an aluminum foil layer, a coating layer, an adhesive layer and a heat seal layer sequentially from the top down, wherein the protective layer is compounded on the corresponding coating layer through the corresponding coating layer; and the heat seal layer is compounded on the corresponding coating layer through the corresponding adhesive layer. The aluminum plastic packaging film improves the corrosion resistance of the aluminum foil, improves the bonding strength of each structural layer, and is simple in process, environment-friendly, long in service life and high in reliability.

Description

A kind of lithium ion battery is used plastic-aluminum packaging film

Technical field

The utility model relates to lithium ion battery and uses the packaging film technical field, refers in particular to a kind ofly through apply corrosion resistant dope layer at aluminium foil surface, makes lithium ion battery with plastic-aluminum packaging film tool high barrier, good electrolyte resistance corrosive nature, good mouldability.

Background technology

Lithium ion battery has advantages such as energy density height, voltage high (3.7V), self discharge are little, memory-less effect, green non-pollution; Obtain develop rapidly in recent ten years; And occupy an leading position in field of portable electronic apparatus such as notebook computer, mobile phone, digital cameras with its high performance price ratio advantage; And progressively be developed as the electrical source of power of electric automobile; Polymer Li-ion battery and the security of liquid flexible packing lithium ion electric pond is good, shape is free, thickness is little, energy density is high has the incomparable advantage of duricrust lithium ion battery (box hat, aluminum hull, plastic housing), has become the developing direction of high performance lithium ion battery.

Chinese patent 200410058323.2 discloses a kind of packaging material for battery case; This material has by the heat-resistant resin film and forms skin, aluminium foil sandwich layer and the internal layer that formed by the thermoplastic resin membrane forms through the compound manufacturing of dry type, and the aluminium foil sandwich layer is handled with chromate.Chinese patent 200410089189.2 also openly has a kind of lithium ion battery flexible packaging film of same 26S Proteasome Structure and Function.Chinese patent 00806337.0 discloses a kind of polymer battery packaging material, and this patent has been carried out the chemical conversion processing to aluminium foil, and compound through compound aluminium foil and the outermost resin of making of dry type, the aluminium foil another side is compound with inner layer resin with the back heating through extrusion molding.

Because the barrier property of plastic-aluminum packaging film inner layer resin is very poor; Can not effectively stop electrolyte permeability to cross inner layer resin and corrode aluminium foil surface; Above patent is for improving the anti-electrolyte corrosive power of aluminium foil; Must carry out chromaking processing or chemical conversion processing to aluminium foil, because chromium ion has toxicity, the aluminium foil chromaking is handled or the chemical conversion processing has very big pollution to environment.On the other hand, the processing of aluminium foil chromaking can have influence on the feature of environmental protection of aluminum plastic film; In addition, aluminium foil is carried out the complex process that chromaking is handled, comprise that prerinse, chromaking handle, carry out multiple working procedures such as three cleanings, oven dry.

To this defective of aluminum plastic film, the utility model effectively protects aluminium foil not corroded by electrolyte through applying the corrosion resistant dope layer of one deck at aluminium foil surface, satisfies the requirement of aluminum plastic film long-life, high reliability.Simultaneously; It is simple to be coated with layer manufacturing method, includes only coating, dry two procedures, and the coating material environmental protection; Satisfy Rohs (Restriction of Hazardous Substances, " about being limited in the instruction of using some harmful components in the electronic and electrical equipment ") requirement.

Summary of the invention

The purpose of the utility model is to overcome weak point of the prior art and provides a kind of lithium ion battery to use plastic-aluminum packaging film, this plastic-aluminum packaging film tool high barrier, good electrolyte resistance corrosive nature, good mouldability, environmental protection.

For realizing above-mentioned purpose, the utility model adopts following technical scheme:

A kind of lithium ion battery is used plastic-aluminum packaging film; Said plastic-aluminum packaging film is a layer structure; It is followed successively by protective layer, adhesive phase, dope layer, aluminium foil layer, dope layer, adhesive phase and hot sealing layer from top to bottom; Wherein, protective layer is compound on the corresponding dope layer through corresponding adhesive phase, and hot sealing layer is compound on the corresponding dope layer through corresponding adhesive phase.

Said aluminium foil layer is the soft attitude high-mouldability aluminium foil of annealed processing, and this aluminium foil layer thickness is 20～100 microns.

Said dope layer is dissolved in solution that ethyl acetate forms by polymer and is coated in the aluminium foil layer surface and forms, and the thickness of this dope layer is 0.1～10 micron.

Said adhesive phase is coated on the dope layer by the mixture of binding agent, curing agent and solvent composition and forms.

Said protective layer is the stable on heating resinae coextrusion casting of a tool stretched film, and the thickness of this protective layer is 10～100 microns.

Said hot sealing layer is the non-stretching film of resinae coextrusion casting, and the thickness of this hot sealing layer is 15～100 microns.

The beneficial effect of the utility model is: through the surface-coated one deck corrosion resistant coating to aluminium foil layer, dope layer can not dissolved by electrolyte, swelling, has improved self resistance to corrosion of aluminium foil; Aluminium foil layer no longer directly combines with adhesive phase, but combines indirectly with adhesive through dope layer, has improved the adhesion strength between aluminium foil layer and hot sealing layer, aluminium foil layer and the protective layer; In addition, its manufacturing approach craft is simple, environmental protection, the plastic-aluminum packaging film long service life that produces, reliability height.

Description of drawings

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

Fig. 2 is the full sectional view of A-A direction among Fig. 1.

The specific embodiment

Below in conjunction with Figure of description the utility model is described further:

At first; The annealing in process of learning from else's experience thickness is that 20～100 microns soft attitude height becomes the sexual type aluminium foil as aluminium foil layer 4; To be dissolved in solution that ethyl acetate forms by polymer and be coated in the aluminium foil layer surface and forms a kind of in aluminium foil layer 5 dual coated through in the method for intaglio printing, dip-coating, transfer coated, blade coating or extrusion coated, formation thickness is 0.1～10 micron dope layer 3; Secondly; Be coated with the solution of processing by the mixture of binding agent, curing agent and solvent composition in dope layer 3 one sides; Form adhesive phase 2; Simultaneously, it is compound through dry compound machine thickness to be that the adhesive phase 2 of 10～100 microns tool stable on heating resinae coextrusion casting stretched film and this face carries out, and forms protective layer 1; Then, be coated with above-mentioned adhesive phase 2 simultaneously at the another side of the aluminium foil layer that is coated with dope layer 34, through dry compound machine the non-stretching film of coextrusion casting and this adhesive phase 2 are carried out compound, formation hot sealing layer 5; At last, compound good plastic-aluminum packaging film rolling is solidified, make lithium ion battery with plastic-aluminum packaging film (shown in Fig. 1-2).

In sum, a kind of lithium ion battery that the utility model disclosed is used plastic-aluminum packaging film, and it is through to the corrosion resistant dope layer 3 of surface-coated one deck of aluminium foil layer 4, and dope layer 3 can not dissolved by electrolyte, swelling, has improved self resistance to corrosion of aluminium foil; Aluminium foil layer 4 no longer directly combines with adhesive phase 2, but combines indirectly with adhesive phase 2 through dope layer 3, has improved the adhesion strength between aluminium foil layer 4 and hot sealing layer 5, aluminium foil layer 4 and the protective layer 1; In addition, its manufacturing approach craft is simple, environmental protection, the plastic-aluminum packaging film long service life that produces, reliability height.

The above only is the preferred embodiment to the utility model; Be not that scope to the utility model limits; So under the prerequisite that does not break away from the utility model design spirit; The equivalence that the common engineers and technicians in this area do the described structure of the utility model, characteristic and principle changes or decorates, and all should fall in the protection domain that the utility model applies for a patent.

Claims

1. a lithium ion battery is used plastic-aluminum packaging film; It is characterized in that: said plastic-aluminum packaging film is a layer structure; It is followed successively by protective layer, adhesive phase, dope layer, aluminium foil layer, dope layer, adhesive phase and hot sealing layer from top to bottom; Wherein, protective layer is compound on the corresponding dope layer through corresponding adhesive phase, and hot sealing layer is compound on the corresponding dope layer through corresponding adhesive phase.

2. plastic-aluminum packaging film according to claim 1 is characterized in that: said aluminium foil layer is the soft attitude high-mouldability aluminium foil of annealed processing, and this aluminium foil layer thickness is 20～100 microns.

3. plastic-aluminum packaging film according to claim 1 is characterized in that: said dope layer is dissolved in solution that ethyl acetate forms by polymer and is coated in the aluminium foil layer surface and forms, and the thickness of this dope layer is 0.1～10 micron.

4. plastic-aluminum packaging film according to claim 1 is characterized in that: said adhesive phase is coated on the dope layer by the mixture of binding agent, curing agent and solvent composition and forms.

5. plastic-aluminum packaging film according to claim 1 is characterized in that: said protective layer is the stable on heating resinae coextrusion casting of a tool stretched film, and the thickness of this protective layer is 10～100 microns.

6. plastic-aluminum packaging film according to claim 1 is characterized in that: said hot sealing layer is the non-stretching film of resinae coextrusion casting, and the thickness of this hot sealing layer is 15～100 microns.