# US 12,603,361 B2 · Pouch type battery case and pouch type secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,361 B2 - Document ID: US12603361B2 - Status: Granted - Kind: B2 - Application number: 17/802,318 - Filed: 2021-04-14 - Published: 2023-03-23 - Granted: 2026-04-14 - Earliest claimed: 2020-04-14 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Sang Hun Kim; Soo Ji Hwang; Min Hyeong Kang; Hyung Kyun Yu - Web page: https://patentgrep.com/patent/US12603361B2 ## CPC - H01M 50/105: Pouches or flexible bags - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/129: with two or more layers of only organic material - H01M 50/133: Thickness - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - Y02E 60/10: Energy storage using batteries - 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 The present invention relates to a pouch type battery case which includes a pouch film laminate including a sealant layer, a gas barrier layer, and a surface protection layer, wherein the sealant layer is formed of a first polymer as an innermost layer, the surface protection layer is formed of a second polymer as an outermost layer, and the gas barrier layer is laminated between the surface protection layer and the sealant layer and is formed of an aluminum alloy thin film having a thickness of 60 μm to 100 μm and a grain size of 10 μm to 13 μm. ## Claims ### Claim 1 A pouch type battery case accommodating an electrode assembly therein which is formed by stacking a positive electrode, a separator, and a negative electrode, the pouch type battery case comprising a pouch film laminate including: a sealant layer formed of a first polymer that is an innermost layer; a surface protection layer formed of a second polymer that is an outermost layer; and a gas barrier layer laminated between the surface protection layer and the sealant layer and formed of an aluminum alloy film having a thickness of 60 μm to 100 μm and a grain size of 10.5 μm to 12.5 μm, the grain size being an average of maximum diameters of 30 random grains in a thickness direction cross section of the aluminum alloy film, wherein the sealant layer has a thickness of 50 μm to 90 μm, and the pouch film laminate has a total thickness of 180 μm or more. ### Claim 2 (depends on 1) The pouch type battery case of claim 1, wherein the aluminum alloy film comprises iron in an amount of 1.2 wt % to 1.7 wt %. ### Claim 3 (depends on 1) The pouch type battery case of claim 1, wherein the aluminum alloy film comprises iron in an amount of 1.3 wt % to 1.7 wt %. ### Claim 4 (depends on 1) The pouch type battery case of claim 1, wherein the aluminum alloy film comprises silicon in an amount of 0.2 wt % or less. ### Claim 5 (depends on 1) The pouch type battery case of claim 1, wherein the aluminum alloy film has alloy number AA8021. ### Claim 6 (depends on 1) The pouch type battery case of claim 1, wherein the gas barrier layer has a thickness of 70 μm to 90 μm. ### Claim 7 (depends on 1) The pouch type battery case of claim 1, wherein a thickness of the sealant layer is 0.6 times to 1.2 times a thickness of the gas barrier layer. ### Claim 8 (depends on 1) The pouch type battery case of claim 1, wherein the first polymer comprises polypropylene (PP). ### Claim 9 (depends on 1) The pouch type battery case of claim 1, wherein the surface protection layer has a thickness of 6 μm to 25 μm. ### Claim 10 (depends on 1) The pouch type battery case of claim 1, wherein the second polymer comprises polyethylene terephthalate (PET). ### Claim 11 (depends on 1) The pouch type battery case of claim 1, further comprising a drawing assistance layer formed of a third polymer and laminated between the surface protection layer and the gas barrier layer. ### Claim 12 (depends on 11) The pouch type battery case of claim 11, wherein the drawing assistance layer has a thickness of 20 μm to 50 μm. ### Claim 13 (depends on 11) The pouch type battery case of claim 11, wherein the third polymer comprises Nylon. ### Claim 14 (depends on 1) The pouch type battery case of claim 1, wherein the pouch film laminate has a tensile strength, measured while the pouch film laminate is pulled at a tensile speed of 50 mm/min after being cut to a size of 15 mm×80 mm, of 200 N/15 mm to 300 N/15 mm, and has an elongation of 105% to 150%. ### Claim 15 (depends on 1) The pouch type battery case of claim 1, wherein the pouch film laminate has a puncture strength of 30 N or more. ### Claim 16 A pouch type secondary battery comprising an electrode assembly therein which is formed by stacking a positive electrode, a separator, and a negative electrode; and a pouch type battery case accommodating the electrode assembly, the battery case comprising a pouch film laminate including: a sealant layer formed of a first polymer that is an innermost layer; a surface protection layer formed of a second polymer that is an outermost layer; and a gas barrier layer laminated between the surface protection layer and the sealant layer and formed of an aluminum alloy film having a thickness of 60 μm to 100 μm and a grain size of 10.5 μm to 12.5 μm, the grain size being an average of maximum diameters of 30 random grains in a thickness direction cross section of the aluminum alloy film, wherein the sealant layer has a thickness of 50 μm to 90 μm, and the pouch film laminate has a total thickness of 180 μm or more.