# US 12,183,933 B2 · Cylindrical battery and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,933 B2 - Document ID: US12183933B2 - Status: Granted - Kind: B2 - Application number: 17/264,102 - Filed: 2019-08-19 - Published: 2021-09-30 - Granted: 2024-12-31 - Earliest claimed: 2018-08-28 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Kwan Hong Bae; Chan Woo Park; Yeon Kyong Wang; Jin Seop Kwak - Web page: https://patentgrep.com/patent/US12183933B2 ## CPC - H01M 50/186: characterised by the disposition of the sealing members - B23K 26/36: Removing material (B23K26/55, B23K26/57 take precedence) - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/119: Metals - H01M 50/147: Lids or covers - H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) - H01M 50/167: by crimping - H01M 50/171: using adhesives or sealing agents - H01M 50/184: characterised by their shape or structure - B23K 2101/36: Electric or electronic devices - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - 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 ## Abstract A cylindrical battery in which an electrode assembly is housed in a cylindrical can includes a cap assembly covering an upper opening of the cylindrical can; and a gasket disposed in a space between the cylindrical can and the cap assembly. The gasket is disposed on a crimping part formed by processing an end part of the cylindrical can to be bent, and an exposed part of the gasket protruded outside from a space between the cylindrical can and the cap assembly covers a trimming part of the cylindrical can. ## Claims ### Claim 1 A method for manufacturing a cylindrical battery, comprising: a step of trimming a top end part of a cylindrical can; a step of housing an electrode assembly in the cylindrical can; a step of mounting a cap assembly at the top end part of the electrode assembly; a step of providing a gasket between the cap assembly and an upper end part of the cylindrical can; a step of processing the upper end part of the cylindrical can to form a crimping part; and a step of pressing an exposed part of the gasket protruding outside from a space between the cylindrical can and the cap assembly to be bent into the trimming part of the cylindrical can such that an end of the exposed part of the gasket is bent upward to extend beyond the trimming part in a longitudinal direction of the cylindrical can, wherein, in the step of pressing the exposed part of the gasket, a pressure rod is used to press the exposed part of the gasket, and wherein the pressure rod includes a heating member. ### Claim 2 (depends on 1) The method for manufacturing the cylindrical battery of claim 1, wherein a temperature of the pressure rod is 100 degrees to 300 degrees Celsius. ### Claim 3 A method for manufacturing a cylindrical battery, comprising: a step of trimming a top end part of a cylindrical can; a step of housing an electrode assembly in the cylindrical can; a step of mounting a cap assembly at the top end part of the electrode assembly; a step of providing a gasket between the cap assembly and an upper end part of the cylindrical can; a step of processing the upper end part of the cylindrical can to form a crimping part; and a step of pressing an exposed part of the gasket protruding outside from a space between the cylindrical can and the cap assembly to be bent into the trimming part of the cylindrical can such that an end of the exposed part of the gasket is bent upward to extend beyond the trimming part in a longitudinal direction of the cylindrical can, wherein, in the step of pressing the exposed part of the gasket, the cylindrical can is rotated while the exposed part of the gasket is pressed. ### Claim 4 A method for manufacturing a cylindrical battery, comprising: a step of trimming a top end part of a cylindrical can; a step of housing an electrode assembly in the cylindrical can; a step of mounting a cap assembly at the top end part of the electrode assembly; a step of providing a gasket between the cap assembly and an upper end part of the cylindrical can; a step of processing the upper end part of the cylindrical can to form a crimping part; a step of pressing an exposed part of the gasket protruding outside from a space between the cylindrical can and the cap assembly to be bent into the trimming part of the cylindrical can such that an end of the exposed part of the gasket is bent upward to extend beyond the trimming part in a longitudinal direction of the cylindrical can; and a step of irradiating a laser beam between an upper surface of the cap assembly and the exposed part of the gasket to remove an electrolyte solution and moisture. ### Claim 5 (depends on 4) The method for manufacturing the cylindrical battery of claim 4, wherein energy of the laser beam is in a range of 20 to 50 Joules. ### Claim 6 (depends on 4) The method for manufacturing the cylindrical battery of claim 4, wherein a peak output of the laser beam is in a range of 3 kilowatts to 8 kilowatts. ### Claim 7 (depends on 4) The method for manufacturing the cylindrical battery of claim 4, wherein a temperature range of a point wherein the laser beam is irradiated is 400 to 600 degrees Celsius.