# US 12,009,529 B2 · Secondary battery case and secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,529 B2 - Document ID: US12009529B2 - Status: Granted - Kind: B2 - Application number: 17/569,758 - Filed: 2022-01-06 - Published: 2022-07-07 - Granted: 2024-06-11 - Earliest claimed: 2021-01-07 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Hyun Beom Kim; Kyu Hyun Choi; Min Kyu Min - Web page: https://patentgrep.com/patent/US12009529B2 ## CPC - H01M 50/105: Pouches or flexible bags - H01M 10/052: Li-accumulators - H01M 50/136: Flexibility or foldability - H01M 50/238: Flexibility or foldability - 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 A secondary battery case accommodates an electrode assembly having a structure in which electrodes and separators are alternately arranged, and includes a first cup having a recessed shape, a second cup having a recessed shape and provided on one side of the first cup, a first peripheral portion surrounding a perimeter of the first cup when the secondary battery case is unfolded, and a second peripheral portion surrounding a perimeter of the second cup when the secondary battery case is unfolded. The first peripheral portion includes a first cup-corresponding peripheral portion that corresponds to a width of the first cup, and the second peripheral portion includes a second cup-corresponding peripheral portion that corresponds to the second cup. The width of the first cup is greater than a length of the first cup-corresponding peripheral portion thereby reducing if not eliminated a bat-ear otherwise formed during manufacture. ## Claims ### Claim 1 A secondary battery case configured to accommodate an electrode assembly having a structure in which electrodes and separators are alternately arranged, the secondary battery case comprising: a first cup having a recessed shape; a second cup having a recessed shape and provided on one side of the first cup; a first peripheral portion surrounding a perimeter of the first cup when the secondary battery case is unfolded; and a second peripheral portion surrounding a perimeter of the second cup when the secondary battery case is unfolded, wherein the first peripheral portion comprises a first cup-corresponding peripheral portion that corresponds to a width of the first cup, and the second peripheral portion comprises a second cup-corresponding peripheral portion that corresponds to a width of the second cup, wherein the width of the first cup is greater than a dimension of the first cup-corresponding peripheral portion in a width direction. ### Claim 2 (depends on 1) The secondary battery case of claim 1, wherein the width of the first cup is measured as a distance from a medial wall portion of the first cup to a first reference vertical line which is perpendicular to the first peripheral portion and passes through an upper end point of a lateral wall portion of the first cup, and the dimension of the first cup-corresponding peripheral portion is a distance from a peripheral connection point, at which the first peripheral portion meets the second peripheral portion, to a point on the first peripheral portion corresponding to the upper end point of the lateral wall portion of the first cup. ### Claim 3 (depends on 2) The secondary battery case of claim 2, wherein a region, in which the first peripheral portion is connected to the second peripheral portion, is formed in a round shape having a first predetermined radius of curvature, and the first cup-corresponding peripheral portion comprises a first curved portion which is formed by a portion of the round shape and a first straight portion which is other than the first curved portion and has a straight shape. ### Claim 4 (depends on 3) The secondary battery case of claim 3, wherein the width of the first cup is greater than a sum of a dimension of the first curved portion and a dimension of the first straight portion. ### Claim 5 (depends on 4) The secondary battery case of claim 4, wherein the first cup-corresponding peripheral portion and the second cup-corresponding peripheral portion form a predetermined angle hand have a V shape. ### Claim 6 (depends on 5) The secondary battery case of claim 5, wherein the predetermined angle is between about 130 degrees and about 170 degrees. ### Claim 7 (depends on 6) The secondary battery case of claim 6, wherein the first predetermined radius of curvature is approximately equal to or greater than 3 mm. ### Claim 8 (depends on 1) The secondary battery case of claim 1, wherein a distance between a peripheral connection point-, at which the first peripheral portion meets the second peripheral portion, and a bridge connection point, at which a medial wall portion of the first cup is connected to a medial wall portion of the second cup, is less than about 1 mm. ### Claim 9 (depends on 1) The secondary battery case of claim 1, wherein a region, in which a medial wall portion of the first cup is connected to a medial wall portion of the second cup, is formed in a round shape having a second predetermined radius of curvature, and the second predetermined radius of curvature is less than about 2 mm. ### Claim 10 (depends on 1) The secondary battery case of claim 1, wherein the width of the second cup is greater than a dimension of the second cup-corresponding peripheral portion. ### Claim 11 (depends on 10) The secondary battery case of claim 10, wherein the width of the second cup is measured as a distance from a medial wall portion of the second cup to a second reference vertical line which is perpendicular to the second peripheral portion and passes through an upper end point of a lateral wall portion of the second cup, and the dimension of the second cup-corresponding peripheral portion is a distance from a peripheral connection point, at which the first peripheral portion meets the second peripheral portion, to a point on the second peripheral portion corresponding to the upper end point of the lateral wall portion of the second cup. ### Claim 12 (depends on 11) The secondary battery case of claim 11, wherein a region, in which the first peripheral portion is connected to the second peripheral portion, is formed in a round shape having a first predetermined radius of curvature, and the second cup-corresponding peripheral portion comprises a second curved portion which is formed by a portion of the round shape and a second straight portion which is other than the second curved portion and has a straight shape. ### Claim 13 (depends on 12) The secondary battery case of claim 12, wherein the width of the second cup is greater than a sum of a dimension of the second curved portion and a dimension of the second straight portion. ### Claim 14 (depends on 1) A secondary battery comprising: the secondary battery case of claim 1; an electrode assembly provided within the secondary battery case; and an electrolyte accommodated together with the electrode assembly within the secondary battery case. ### Claim 15 A secondary battery case configured to accommodate an electrode assembly, comprising: a cup having a recessed shape; and a peripheral portion surrounding a perimeter of the cup when the secondary battery case is unfolded, wherein the peripheral portion comprises a cup-corresponding peripheral portion that corresponds to a width of the cup, wherein the width of the cup is greater than a dimension of the cup-corresponding peripheral portion in a width direction. ### Claim 16 (depends on 15) The secondary battery case of claim 15, wherein the width of the cup is measured as a distance from a first wall portion of the cup to a reference vertical line which is perpendicular to the peripheral portion and passes through an upper end point of a second wall portion of the cup, and the dimension of the cup-corresponding peripheral portion is a distance from a peripheral connection point, which is a point on the peripheral portion and along a fold line in which the secondary battery case is folded, to a point on the peripheral portion corresponding to the upper end point of the second wall portion of the cup. ### Claim 17 (depends on 16) The secondary battery case of claim 16, wherein the cup-corresponding peripheral portion comprises a curved portion having a predetermined radius of curvature and a straight portion. ### Claim 18 (depends on 17) The secondary battery case of claim 17, wherein the width of the cup is greater than a sum of a dimension of the curved portion and a dimension of the straight portion. ### Claim 19 (depends on 15) The secondary battery case of claim 15, further comprising an electrode assembly and an electrolyte provided within the secondary battery case.