# US 2021/0340646 A1 · Aluminum alloy sheet for battery lid use for forming integrated explosion-proof valve and method of production of same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0340646 A1 - Document ID: US20210340646A1 - Status: Published application - Kind: A1 - Application number: 16/619,037 - Filed: 2018-12-05 - Published: 2021-11-04 - Earliest claimed: 2018-08-23 - Assignees: Nippon Light Metal Company, Ltd. - Applicants: Nippon Light Metal Company, Ltd. - Inventors: Yuuichi TAMAKI; Keiji KANAMORI; Daisuke SHIMOSAKA; Toshiya ANAMI - Web page: https://patentgrep.com/patent/US20210340646A1 ## CPC - C22C 21/00: Alloys based on aluminium - B22D 7/005: {from non-ferrous metals} - B22D 11/049: for direct chill casting, e.g. electromagnetic casting - B22D 11/1206: {for plastic shaping of strands (rolling mills B21B1/46)} - B22D 11/1213: {for heating or insulating strands} - C21D 1/26: Methods of annealing - C21D 8/0226: {Hot rolling} - C21D 8/0236: {Cold rolling} - C21D 8/0273: {Final recrystallisation annealing} - C21D 9/46: for sheet metals - C22F 1/04: of aluminium or alloys based thereon - H01M 50/147: Lids or covers - H01M 50/159: Metals - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 10/052: Li-accumulators - Y02E 60/10: Energy storage using batteries - C22C: ALLOYS (treatment of alloys C21D, C22F) - B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Aluminum alloy sheet for battery lid use excellent in heat radiation ability, formability, and work softenability, which aluminum alloy sheet for battery lid use enabling formation of an integrated explosion-proof valve with little variation in operating pressure and excellent in cyclic fatigue resistance, and a method of production of the same are provided, the aluminum alloy sheet for battery lid use for forming an integrated explosion-proof valve having a component composition containing Fe: 1.05 to 1.50 mass %, Mn: 0.15 to 0.70 mass %, Ti: 0.002 to 0.15 mass %, and B: less than 0.04 mass %, having a balance of Al and impurities, having an Fe/Mn ratio restricted to 1.8 to 7.0, restricting, as impurities, Si to less than 0.40 mass %, Cu to less than 0.03 mass %, Mg to less than 0.05 mass %, and V to less than 0.03 mass %, having a conductivity of 53.0% IACS or more, having a value of elongation of 40% or more, having a recrystallized structure, having a value of (TS95−TS80) of less than −3 MPa when defining a tensile strength after cold rolling by a rolling reduction of 80% as TS80 and defining a tensile strength after cold rolling by a rolling reduction of 95% as TS95, and having a value of elongation after cold rolling by a rolling reduction of 90% of 5.0% or more. Furthermore, an average grain size of the recrystallized grains of the recrystallized structure is preferably 15 to 30 μm. ## Claims ### Claim 1 Aluminum alloy sheet for battery lid use for forming an integrated explosion-proof valve having a component composition containing Fe: 1.05 to 1.50 mass %, Mn: 0.15 to 0.70 mass %, Ti: 0.002 to 0.08 mass %, and B: less than 0.04 mass %, having a balance of Al and impurities, having an Fe/Mn ratio restricted to 1.8 to 7.0, restricting, as impurities, Si to less than 0.40 mass %, Cu to less than 0.03 mass %, Mg to less than 0.05 mass %, and V to less than 0.03 mass %, having a conductivity of 53.0% IACS or more, having a value of elongation of 40% or more, having a recrystallized structure, having a value of (TS95−TS80) of less than −3 MPa when defining a tensile strength after cold rolling by a rolling reduction of 80% as TS80 and defining a tensile strength after cold rolling by a rolling reduction of 95% as TS95, and having a value of elongation after cold rolling by a rolling reduction of 90% of 5.0% or more. ### Claim 2 (depends on 1) The aluminum alloy sheet for battery lid use for forming an integrated explosion-proof valve according to claim 1, wherein an average grain size of the recrystallized grains of the recrystallized structure is 15 to 30 μm. ### Claim 3 (depends on 1) A method of production of the aluminum alloy sheet for battery lid use for forming an integrated explosion-proof valve according to claim 1, comprising: a slab casting process of casting an aluminum alloy melt having a component composition according to claim 1 into a cast ingot by a semicontinuous casting method, a homogenization treatment process of homogenizing the cast ingot at a 520 to 620° C. holding temperature for a 1 hour or more holding time, a hot rolling process of setting a start temperature to 420 to less than 520° C. after said homogenization treatment process so as to hot roll the cast ingot to obtain hot rolled sheet, a cold rolling process of cold rolling said hot rolled sheet to obtain a cold rolled sheet, and a final annealing process of annealing said cold rolled sheet in a batch furnace for final annealing, wherein in said cold rolling process, the final cold rolling is performed with a final cold rolling reduction of 50% to 95% in range and, in said final annealing process, the final annealing is performed with a holding temperature of 300 to 450° C. for 1 hour or more. ### Claim 4 (canceled) ### Claim 5 (depends on 1, 2) A method of production of the aluminum alloy sheet for battery lid use for forming an integrated explosion-proof valve according to claim 2, comprising: a slab casting process of casting an aluminum alloy melt having a component composition according to claim 1 into a cast ingot by a semicontinuous casting method, a homogenization treatment process of homogenizing the cast ingot at a 520 to 620° C. holding temperature for a 1 hour or more holding time, a hot rolling process of setting a start temperature to 420 to less than 520° C. after said homogenization treatment process so as to hot roll the cast ingot to obtain hot rolled sheet, a cold rolling process of cold rolling said hot rolled sheet to obtain a cold rolled sheet, and a final annealing process of annealing said cold rolled sheet in a batch furnace for final annealing, wherein in said cold rolling process, the final cold rolling is performed with a final cold rolling reduction of 50% to 95% in range and, in said final annealing process, the final annealing is performed with a holding temperature of 300 to 450° C. for 1 hour or more.