Adhesive material and electrochemical apparatus containing same
An adhesive material includes an adhesive film, where the adhesive film includes a bonding layer and a first functional layer. The first functional layer includes a styrene-isoprene-styrene rubber and an additive, where the additive includes a wax or a polymer surfactant. With the first functional layer having the styrene-isoprene-styrene rubber and the additive provided, the adhesive material is capable of adjusting bonding strengths on both surfaces of the adhesive film through heat treatment and/or pressure treatment, and avoiding permeation and/or shifting between layers in the adhesive film, thereby improving the safety performance of the electrochemical apparatus.
1 . An adhesive material, comprising an adhesive film, the adhesive film comprising a bonding layer and a first functional layer, wherein the first functional layer comprises a styrene-isoprene-styrene rubber and an additive, and the additive comprises a wax or a polymer surfactant;
wherein the adhesive film is a substrate-free adhesive film; and
wherein a mass percentage of the additive is from 0.5% to 5.0% based on a total mass of the first functional layer.
2 . The adhesive material according to claim 1 , wherein the first functional layer has a bonding strength of 0.01 N/mm to 0.05 N/mm at 23° C. to 26° C.
3 . The adhesive material according to claim 1 , wherein the first functional layer has a bonding strength of 0.05 N/mm to 1.0 N/mm after heat-pressure treatment.
4 . The adhesive material according to claim 1 , further comprising a release paper, wherein the release paper is provided on a surface of the bonding layer facing away from the first functional layer.
5 . The adhesive material according to claim 1 , the additive comprises the wax.
6 . An electrochemical apparatus, comprising:
an electrode assembly;
a housing; and
the adhesive film according to claim 1 , wherein the bonding layer of the adhesive film is provided on an outer surface of the electrode assembly, the first functional layer of the adhesive film is provided on a surface of the bonding layer facing away from the electrode assembly and is in contact with an inner surface of the housing, and the adhesive film fixes the electrode assembly to the housing.
7 . The electrochemical apparatus according to claim 6 , wherein the bonding layer has a bonding strength of 0.05 N/mm to 1.0 N/mm to the outer surface of the electrode assembly, and the first functional layer has a bonding strength of 0.05 N/mm to 1.0 N/mm to the inner surface of the housing.
8 . The electrochemical apparatus according to claim 6 , wherein the mass percentage of the additive is from 1.0% to 4.0%.
9 . The electrochemical apparatus according to claim 6 , wherein the styrene-isoprene-styrene rubber comprises one or more selected from the group consisting of styrene-butadiene rubber, nitrile rubber, butyl rubber, chloroprene rubber, polysulfide rubber, polyurethane rubber, polyacrylate rubber, chlorosulfonated polyethylene rubber, silicone rubber, fluorine rubber, butadiene rubber, isoprene rubber, and ethylene propylene rubber.
10 . The electrochemical apparatus according to claim 6 , wherein the wax comprises one or more of paraffin wax, sasol wax, polyethylene wax, or polypropylene wax.
11 . The electrochemical apparatus according to claim 6 , wherein the polymer surfactant comprises one or more selected from the group consisting of the following components: polyacrylamide, polyacrylamide copolymer, polyacrylic acid, polyacrylic acid copolymer, polybutyric acid, polybutyric acid copolymer, maleic anhydride copolymer, polyethyleneimine, polymaleamide, polymethylene lymide derivatives, quaternized polyacrylamide, polydimethylamine cyclopropane, polyvinyl alcohol, polyvinyl alcohol esterification products, polyvinyl alcohol acetalization products, and polyethylene oxide-propylene oxide.
12 . The electrochemical apparatus according to claim 6 , wherein the bonding layer comprises one or more selected from the group consisting of acrylic, polypropylene, styrene-isoprene-styrene (SIS) rubber, polyethylene, and polyamide.
13 . The electrochemical apparatus according to claim 6 , wherein a dyne value of the bonding layer is 30 mN/m to 48 mN/m, and a dyne value of the first functional layer is 30 mN/m to 48 mN/m.
14 . The electrochemical apparatus according to claim 6 , wherein a thickness of the bonding layer is 1 μm to 15 μm, and a thickness of the first functional layer is 1 μm to 15 μm, wherein the thickness of the first functional layer is greater than or equal to the thickness of the bonding layer.
15 . The electrochemical apparatus according to claim 6 , wherein the adhesive film further comprises a second functional layer, the second functional layer being provided between the bonding layer and the first functional layer, wherein the second functional layer comprises a heat conduction filler, and a mass ratio of the heat conduction filler is 5% to 50% based on a total mass of the second functional layer.
16 . The electrochemical apparatus according to claim 15 , wherein the mass ratio of the heat conduction filler is 20% to 40%.
17 . The electrochemical apparatus according to claim 15 , wherein the heat conduction filler comprises one or more selected from the group consisting of diamond, graphite, graphene, alumina, boron nitride, silicon dioxide, and calcium oxide.
18 . The electrochemical apparatus according to claim 15 , wherein a thickness of the second functional layer is 5 μm to 20 μm.