# US 12,763,405 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 12,763,405 B2 - Document ID: US12763405B2 - Status: Granted - Kind: B2 - Application number: 18/021,706 - Filed: 2021-08-19 - Published: 2024-01-11 - Granted: 2026-10-13 - Earliest claimed: 2020-08-19 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Se Young Oh; Jeong Min Ha; Geun Hee Kim; Hyun Beom Kim; Hyung Ho Kwon - Web page: https://patentgrep.com/patent/US12763405B2 ## CPC - H01M 50/105: Pouches or flexible bags - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/126: comprising three or more layers - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/193: Organic material - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY ## Abstract A pouch-type battery case according to an embodiment of the present invention for achieving the above objects includes: a first case and a second case, in which cup parts each of which is configured to accommodate an electrode assembly, in which electrodes and separators are stacked, therein is formed, respectively; and a bridge formed between the two cup parts, wherein the bridge has a thickness of 2 mm or less. ## Claims ### Claim 1 A pouch-type battery case, comprising: a first case and a second case defining a cup part formed of a first cup part and a second cup part, the cup part being configured to accommodate an electrode assembly, in which electrodes and separators are stacked, respectively; and a bridge formed between the first and second cup parts, wherein a thickness of the bridge is: 2 mm or less; and/or between 1/200 and 1/30 of a width of the electrode assembly, wherein each one of the first and second cup parts comprise a plurality of punch edges, which connect a plurality of outer walls configured to surround a periphery thereof to a bottom part, respectively, and at least one of the punch edges is rounded, wherein the first and second cup parts further comprise a thickness edge configured to connect two outer walls adjacent to each other, and wherein the thickness edge is connected to the two punch edges adjacent to each other to form corners. ### Claim 2 (depends on 1) The pouch-type battery case of claim 1, wherein the bridge comprises a radius of curvature of 1 mm or less. ### Claim 3 (depends on 1) The pouch-type battery case of claim 1, wherein the bridge has a thickness corresponding to a distance between two bridge vertical lines, which pass through a boundary point of the bridge and a bridge-side outer wall, respectively, and are perpendicular to a bottom part. ### Claim 4 (depends on 1) The pouch-type battery case of claim 1, wherein the punch edge has a radius of curvature radius that is between 1/20 and ⅙ of a depth of one of the first or second cup parts. ### Claim 5 (depends on 1) The pouch-type battery case of claim 1, wherein, in the plurality of punch edges, a bridge-side punch edge configured to connect a bridge-side outer wall facing the bridge to the bottom part is rounded. ### Claim 6 (depends on 1) The pouch-type battery case of claim 1, wherein at least one of the corners is rounded, and the at least rounded corner has a radius of curvature equal to or greater than a radius of curvature of at least one of the punch edge or the thickness edge. ### Claim 7 (depends on 1) The pouch-type battery case of claim 1, wherein the first and second cup parts further comprise a plurality of die edges configured to connect the outer wall to a side or degassing part. ### Claim 8 (depends on 7) The pouch-type battery case of claim 7, wherein the die edges have a radius of curvature between 1/20 and ⅙ of a depth of the cup part. ### Claim 9 (depends on 7) The pouch-type battery case of claim 7, wherein at least one of the die edges has a radius of curvature of 1 mm or less. ### Claim 10 (depends on 7) The pouch-type battery case of claim 7, wherein a vertical distance between a die edge vertical line, which passes a boundary point of the die edge and the die edge-side outer wall and is perpendicular to the bottom part, and an edge vertical line, which passes a boundary point of the die edge-side punch edge and the die edge-side outer wall and is perpendicular to the bottom part, is 0.5 mm or less. ### Claim 11 (depends on 1) The pouch-type battery case of claim 1, wherein the cup part has a depth of at least 6.5 mm. ### Claim 12 (depends on 11) The pouch-type battery case of claim 11, wherein an outer wall of the cup part is inclined at an inclination angle of between 90° and 95° from the bottom part of the cup part. ### Claim 13 (depends on 1) The pouch-type battery case of claim 1, wherein the pouch film is molded to be manufactured, and the pouch film comprises: a sealant layer made of a first polymer formed at the innermost layer; a surface protection layer made of a second polymer formed at the outermost layer; and a moisture barrier layer stacked between the surface protection layer and the sealant layer, wherein the moisture barrier layer is formed as an aluminum alloy thin film having a thickness of between 50 μm and 80 μm and a grain size of between 10 μm and 13 μm, and the sealant layer has a thickness of between 60 μm and 100 μm. ### Claim 14 (depends on 13) The pouch-type battery case of claim 13, wherein the aluminum alloy thin film comprises an AA8021 aluminum alloy. ### Claim 15 (depends on 13) The pouch-type battery case of claim 13, wherein the aluminum alloy thin film contains between 1.3 wt % and 1.7 wt % of iron and 0.2 wt % or less of silicon. ### Claim 16 (depends on 13) The pouch-type battery case of claim 13, wherein the moisture barrier layer has a thickness of between 55 μm and 65 μm, and the sealant has a thickness of between 75 μm and 85 μm. ### Claim 17 (depends on 13) The pouch-type battery case of claim 13, further comprising an elongation assistance layer made of a third polymer and stacked between the surface protection layer and the moisture barrier layer, wherein the elongation assistance layer has a thickness of between 20 μm and 50 μm. ### Claim 18 A pouch-type secondary battery comprising: an electrode assembly in which electrodes and separators are stacked; a pouch-type battery case comprising a cup part configured to accommodate the electrode assembly therein, wherein the pouch-type battery case comprises: a first case and a second case, of which at least one comprises a cup part; and a folding part configured to integrally connect the first case to the second case, wherein the folding part has a width of 1 mm to 3.2 mm, wherein the cup part comprises a plurality of punch edges, which connect a plurality of outer walls configured to surround a periphery thereof to a bottom part, respectively, and at least one of the punch edges is rounded, wherein the cup part further comprise a thickness edge configured to connect two outer walls adjacent to each other, and wherein the thickness edge is connected to the two punch edges adjacent to each other to form corners. ### Claim 19 (depends on 18) The pouch-type secondary battery of claim 18, wherein the electrode assembly has an area of 15,000 mm2 to 100,000 mm2. ### Claim 20 (depends on 18) The pouch-type secondary battery of claim 18, wherein the folding part comprises a groove that is recessed inward. ### Claim 21 (depends on 20) The pouch-type secondary battery of claim 20, wherein the battery case comprises a pair of protrusions protruding outward with the groove therebetween, and a distance between the innermost portion of the groove and the outermost portion of the protrusion is 0.8 mm or less.