Cylindrical nonaqueous electrolyte battery
View Patent ↗A cylindrical nonaqueous electrolyte secondary battery includes: a wound electrode unit as a wound electrode laminate of belt-like positive and negative electrodes laminated via a separator, the positive electrode including a positive electrode collector and a positive electrode active material layer, and the negative electrode including a negative electrode collector and a negative electrode active material layer; an adhesive member provided to cover the wound electrode laminate at a terminating end portion lying on an outer side of the wound electrode unit; and a battery canister housing the wound electrode unit, the adhesive member including a base material, and an adhesive layer provided on a whole surface or on at least a part of the surface on one side of the base material, and the base material being a mixture of a resin material of high swellability and a resin material of high melting point.
1. A cylindrical nonaqueous electrolyte secondary battery comprising:
a wound electrode unit as a wound electrode laminate of a belt shaped positive electrode and a belt shaped negative electrode laminated via a separator, the positive electrode including a positive electrode collector and a positive electrode active material layer formed on the positive electrode collector, and the negative electrode including a negative electrode collector and a negative electrode active material layer formed on the negative electrode collector;
an adhesive member provided to cover the wound electrode laminate at a terminating end portion that lies on an outer side of the wound electrode unit; and
a battery canister that houses the wound electrode unit,
wherein the adhesive member includes a base material, and an adhesive layer provided on a whole surface or on at least a part of the surface on one side of the base material,
wherein the base material is a mixture of a resin material of high swellability and a resin material of high melting point, and
wherein the resin material of high melting point includes acryl rubber.
2. The battery according to claim 1 ,
wherein the resin material of high swellability has a degree of swelling of 5% or more after being dipped in propylene carbonate, and
wherein the resin material of high melting point has a melting point of 60° C. or more.
3. The battery according to claim 2 , wherein the mixture ratio of the resin material of high swellability and the resin material of high melting point ranges from 10:90 to 97:3 in terms of a weight ratio.
4. The battery according to claim 3 , wherein the adhesive member covers at least 10% of the whole area of the outer surface of the wound electrode unit.
5. The battery according to claim 4 , wherein the resin material of high swellability is a polymeric compound that includes a halogen group, or a polar group including an ester group and a carboxyl group.
6. The battery according to claim 5 , wherein the resin material of high swellability is at least one selected from the group consisting of polyvinylidene fluoride, a copolymer of primarily vinylidene fluoride, polybutadiene, polyisoprene, a tetrafluoroethylene-ethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride ternary copolymer.
7. The battery according to claim 4 , wherein the adhesive layer is formed of at least one selected from the group consisting of acrylic adhesive, a rubber-based adhesive, a silicone-based adhesive, a urethane-based adhesive, an α-olefin-based adhesive, an ether-based adhesive, an ethylene-vinyl acetate resin-based adhesive, an epoxy resin-based adhesive, a vinyl chloride resin-based adhesive, a chloroprene rubber-based adhesive, a cyanoacrylate-based adhesive, an aqueous polymer-isocyanate-based adhesive, a styrene-butadiene rubber-based adhesive, a nitrile rubber-based adhesive, a nitrocellulose-based adhesive, a reactive hotmelt-based adhesive, a phenol resin-based adhesive, a modified silicone-based adhesive, a polyamide resin-based adhesive, a polyimide-based adhesive, a polyurethane resin-based adhesive, a polyolefin resin-based adhesive, a polyvinyl acetate resin-based adhesive, a polystyrene resin solvent-based adhesive, a polyvinyl alcohol-based adhesive, a polyvinyl pyrrolidone resin-based adhesive, a polyvinyl butyral resin-based adhesive, a polybenzimidazole-based adhesive, a polymethacrylate resin-based adhesive, a melamine resin-based adhesive, a urea resin-based adhesive, and a resorcinol-based adhesive.
8. The battery according to claim 1 ,
wherein the resin material of high melting point includes polyethylene.
9. The battery according to claim 1 ,
wherein the resin material of high melting point includes polypropylene.
10. The battery according to claim 1 ,
wherein the resin material of high melting point includes polyimide.
11. The battery according to claim 1 , wherein the resin material of high swellability includes polyvinylidene fluoride.
12. The battery according to claim 1 , wherein the resin material of high swellability includes a copolymer of primarily vinylidene fluoride.
13. The battery according to claim 1 , wherein the resin material of high swellability includes polybutadiene.
14. The battery according to claim 1 , wherein the resin material of high swellability includes polyisoprene.
15. The battery according to claim 1 , wherein the resin material of high swellability includes a tetrafluoroethylene-ethylene copolymer.
16. The battery according to claim 1 , wherein the resin material of high swellability includes a tetrafluoroethylene-hexafluoropropylene copolymer.
17. The battery according to claim 1 , wherein the resin material of high swellability includes a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.
18. The battery according to claim 1 , wherein the resin material of high swellability includes a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride ternary copolymer.