# US 11,444,350 B2 · Packaging material for power storage device, and power storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,350 B2 - Document ID: US11444350B2 - Status: Granted - Kind: B2 - Application number: 16/233,181 - Filed: 2018-12-27 - Published: 2019-06-27 - Granted: 2022-09-13 - Earliest claimed: 2017-12-27 - Assignees: Showa Denko Packaging Co., Ltd. - Applicants: Showa Denko Packaging Co., Ltd. - Inventors: Wei He - Web page: https://patentgrep.com/patent/US11444350B2 ## CPC - H01M 50/124: having a layered structure - H01G 11/78: Cases; Housings; Encapsulations; Mountings - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/116: characterised by the material - H01M 50/183: Sealing members - H01G 11/80: Gaskets; Sealings - H01M 50/131: characterised by physical properties, e.g. gas permeability, size or heat resistance - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A packaging material for a power storage device includes a base material layer as an outer layer, a heat fusible resin layer as an inner layer, and a metal foil layer arranged between both the layers. The base material layer and the metal foil layer are adhered via an outer adhesive layer. The outer adhesive layer is formed of a cured film of a two-part curing type urethane adhesive agent including a main agent containing a polyol and a multifunctional isocyanate mixture, wherein a content rate of the polyol is 50 mass % to 95 mass %. The multifunctional isocyanate mixture is composed of a mixture containing an aromatic multifunctional isocyanate and an aliphatic multifunctional isocyanate having an aromatic ring. ## Claims ### Claim 1 A packaging material for a power storage device, comprising: a base material layer as an outer layer; a heat fusible resin layer as an inner layer; and a metal foil layer arranged between the base material layer and the heat fusible resin layer, wherein the base material layer and the metal foil layer are adhered via an outer adhesive layer, wherein the base material layer is formed of a heat resistant resin layer, wherein the outer adhesive layer is formed of a cured film of a two-part curing type urethane adhesive agent including a main agent containing a polyol and a multifunctional isocyanate mixture, wherein a content rate of the polyol is 50 mass % to 95 mass %, wherein the multifunctional isocyanate mixture is consisting of a mixture containing an aromatic multifunctional isocyanate and an aliphatic multifunctional isocyanate having an aromatic ring, wherein, in the multifunctional isocyanate mixture, the aliphatic multifunctional isocayanate having an aromatic ring is present in a higher amount than the aromatic multifunctional isocyanate, wherein the aliphatic multifunctional isocyanate having the aromatic ring is a modified product, wherein a content rate of the aromatic multifunctional isocyanate in the multifunctional isocyanate mixture is 5 mass % to 40 mass %, and wherein a content rate of the aliphatic multifunctional isocyanate having the aromatic ring in the multifunctional isocyanate mixture 60 mass % to 95 mass %, and which packaging material is suitable to be formed into a three-dimensional shape. ### Claim 2 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the polyol is a polyester polyol, wherein the polyester polyol contains a dicarboxylic acid component, and wherein the dicarboxylic acid component contains aromatic dicarboxylic acid, and a content rate of the aromatic dicarboxylic acid in the dicarboxylic acid component is 40 mol % to 80 mol %. ### Claim 3 (depends on 1) The packaging material for a power storage device as recited in claim 1, which packaging material has been formed into a three-dimensional shape. ### Claim 4 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein a Young's modulus of the cured film of the two-part curing type urethane adhesive agent is 90 MPa to 400 MPa. ### Claim 5 (depends on 1) A packaging case for a power storage device comprising a formed product of the packaging material for a power storage device as recited in claim 1. ### Claim 6 (depends on 1) A power storage device, comprising: a power storage device main body; and one or two types of packaging members selected from the group consisting of the packaging material for a power storage device as recited in claim 1 and the packaging case for a power storage device comprising a formed product of the packaging material for said power storage device, wherein the power storage device main body is packaged with the packaging member. ### Claim 7 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the aliphatic multifunctional isocyanate having the aromatic ring is a modified product of xylylene diisocyanate. ### Claim 8 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the aliphatic multifunctional isocyanate having the aromatic ring is a modified product of tetramethylxylylene diisocyanate. ### Claim 9 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the aliphatic multifunctional isocyanate having the aromatic ring is a modified product of diphenylmethane diisocyanate. ### Claim 10 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the aromatic multifunctional isocyanate is a modified product of tolylene diisocyanate. ### Claim 11 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the aromatic multifunctional isocyanate is a modified product of triphenylmethane triisocyanate. ### Claim 12 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the base material layer is formed of a heat resistant resin layer has a melting point higher by 10° C. or more than the melting point of the heat fusible resin layer. ### Claim 13 (depends on 1) The packaging material for a power storage device as recited in claim 1, wherein the base material layer is formed of a heat resistant resin layer has a melting point higher by 20° C. or more than the melting point of the heat fusible resin layer. ### Claim 14 A packaging material for a power storage device, comprising: a base material layer as an outer layer; a heat fusible resin layer as an inner layer; and a metal foil layer arranged between the base material layer and the heat fusible resin layer, wherein the base material layer and the metal foil layer are adhered via an outer adhesive layer, wherein the base material layer is formed of a heat resistant resin layer, wherein the outer adhesive layer is formed of a cured film of a two-part curing type urethane adhesive agent including a main agent containing a polyol and a multifunctional isocyanate mixture, wherein a content rate of the polyol is 50 mass % to 95 mass %, wherein the multifunctional isocyanate mixture is consisting of a mixture containing an aromatic multifunctional isocyanate and an aliphatic multifunctional isocyanate having an aromatic ring, wherein, in the multifunctional isocyanate mixture, the aliphatic multifunctional isocayanate having an aromatic ring is present in a higher amount than the aromatic multifunctional isocyanate, wherein the aliphatic multifunctional isocyanate having the aromatic ring is a modified product, wherein a content rate of the aromatic multifunctional isocyanate in the multifunctional isocyanate mixture is 5 mass % to 40 mass %, and wherein a content rate of the aliphatic multifunctional isocyanate having the aromatic ring in the multifunctional isocyanate mixture is 60 mass % to 95 mass %, which packaging material is suitable to be formed into a three-dimensional shape, and wherein the outer adhesive layer does not turn yellow due to contact with an electrolyte.