PACKAGING MATERIAL FOR BATTERIES

• US 20160049622A1
• Filed: 03/19/2014
• Published: 02/18/2016
• Est. Priority Date: 03/25/2013
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: YAMASHITA, Rikiya, HASHIMOTO, Yohei
• Granted Patent: US 9,570,718 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2264/025 Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
• CPC Class Codes: B32B 2264/0292 Polyurethane particles
• CPC Class Codes: B32B 2264/10 Inorganic particles
• CPC Class Codes: B32B 2264/108 Carbon, e.g. graphite particles
• CPC Class Codes: B32B 2307/714 Inert, i.e. inert to chemical degradation, corrosion
• CPC Class Codes: B32B 2439/00 Containers; Receptacles
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/26 using curing agents
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 27/38 comprising epoxy resins
• CPC Class Codes: B32B 27/40 comprising polyurethanes
• CPC Class Codes: B32B 27/42 comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: H01M 50/105 : Pouches or flexible bags
• CPC Class Codes: H01M 50/119 : Metals
• CPC Class Codes: H01M 50/121 : Organic material
• CPC Class Codes: H01M 50/124 : having a layered structure
• CPC Class Codes: H01M 50/1245 : characterised by the external coating on the casing
• CPC Class Codes: H01M 50/129 : with two or more layers of only organic material
• CPC Class Codes: H01M 50/133 : Thickness
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries

Abstract

A packaging material for batteries, which is formed of a laminate that sequentially includes a base layer, an adhesive layer, a barrier layer and a sealant layer in this order. By having the adhesive layer formed of a cured product of a resin composition that contains a thermosetting resin and (A) a curing accelerator and an elastomer resin or (B) reactive resin beads, the adhesive layer arranged between the base layer and the barrier layer can be cured in a short time, thereby reducing the lead time. In addition, by providing the adhesive layer between the base layer and the barrier layer, the adhesion strength between the base layer and the barrier layer is increased and excellent formability can be achieved.

Claims

1. A battery packaging material which comprises a laminate including at least a base material layer, an adhesive layer, a barrier layer and a sealant layer in this order, wherein

the adhesive layer is a cured product of a resin composition containing a thermosetting resin, and (A) a curing accelerator and an elastomer resin or (B) reactive resin beads.

2. The battery packaging material according to claim 1, wherein the adhesive layer is a cured product of a resin composition containing (B) the reactive resin beads and a curing accelerator.

3. The battery packaging material according to claim 1, wherein the reactive resin beads are urethane resin beads or acrylic resin beads having a functional group.

4. The battery packaging material according to claim 1, wherein the refractive index of the reactive resin beads is 1.3 to 1.8.

5. The battery packaging material according to claim 1, wherein at least one of the layers included in the laminate contains a light-absorbing and heat-generating substance.

6. The battery packaging material according to claim 1, wherein the adhesive layer contains a light-absorbing and heat-generating substance.

7. The battery packaging material according to claim 6, wherein the light-absorbing and heat-generating substance is at least one selected from the group consisting of a metal powder, an inorganic pigment, carbon and an organic dye.

8. The battery packaging material according to claim 6, wherein the battery packaging material includes a third adhesive layer, an insulating layer and a coating layer in this order from the base material layer side on a side of the base material layer opposite to the adhesive layer, and

at least one layer selected from the group consisting of the coating layer, the insulating layer, the third adhesive layer, the base material layer, the adhesive layer and the sealant layer contains a light-absorbing and heat-generating substance.

9. The battery packaging material according to claim 1, wherein the thermosetting resin is at least one selected from the group consisting of an epoxy resin, an amino resin, an acrylic resin, a urethane resin, a phenol resin, an unsaturated polyester resin and an alkyd resin.

10. The battery packaging material according to claim 1, wherein the curing accelerator is at least one selected from the group consisting of an amidine compound, a carbodiimide compound, a ketimine compound, a hydrazine compound, a sulfonium salt, a benzothiazolium salt and a tertiary amine compound.

11. The battery packaging material according to claim 1, wherein the barrier layer is a metal foil.

14. A battery, wherein a battery element including at least a positive electrode, a negative electrode and an electrolyte is stored in the battery packaging material according to claim 1.

12. A method for producing a battery packaging material, the method comprising the steps of:

bonding a base material layer and a barrier layer to each other with a resin composition interposed therebetween, the resin composition containing a thermosetting resin, and (A) a curing accelerator and an elastomer resin or (B) reactive resin beads, and performing heating, thereby curing the resin composition to obtain a laminate including the base material layer, an adhesive layer and the barrier layer in this order; and

laminating a sealant layer on the barrier layer of the laminate obtained in the bonding step.

13. A method for producing a battery packaging material, the method comprising a lamination step of laminating at least a base material layer, an adhesive layer, a barrier layer and a sealant layer in this order, wherein the method comprises in the lamination step the following first step and second step:

the first step of forming a laminate including at least a base material layer, an uncured adhesive layer and a barrier layer in this order, wherein the uncured adhesive layer is a resin composition containing (A) a curing accelerator and an elastomer resin or (B) reactive resin beads, and at least one of the layers included in the laminate contains a light-absorbing and heat-generating substance; and

the second step of converting the uncured adhesive layer into an adhesive layer by heating the laminate obtained in the first step while irradiating the laminate with light having a wavelength at which the light-absorbing and heat-generating substance can generate heat, thereby curing a thermosetting resin contained in the uncured adhesive layer.