# US 12,191,533 B2 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,533 B2 - Document ID: US12191533B2 - Status: Granted - Kind: B2 - Application number: 17/628,874 - Filed: 2020-06-29 - Published: 2022-08-11 - Granted: 2025-01-07 - Earliest claimed: 2019-07-26 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Byoung Min Chun; Gun Gue Park - Web page: https://patentgrep.com/patent/US12191533B2 ## CPC - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 10/0422: {Cells or battery with cylindrical casing} - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 50/147: Lids or covers - H01M 50/179: for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence) - H01M 50/183: Sealing members - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/534: characterised by the material of the leads or tabs - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - H01M 50/593: Spacers; Insulating plates - 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 secondary battery and, in order to resolve a technical problem, provides a secondary battery, which blocks a leakage welding current when welding a current collecting plate to a can by coupling an insulating plate to the current collecting plate, and thus increases the welding strength between the current collecting plate and the can, improves welding strength distribution, and prevents damage between the current collecting plate and the can. To this end, disclosed is a secondary battery comprising: a cylindrical can having an opening; an electrode assembly which is accommodated in the opening of the cylindrical can and which is wound in a cylinder shape; a cap assembly which is electrically connected to the electrode assembly and which seals the cylindrical can; a current collecting plate for electrically connecting the electrode assembly with the cylindrical can; and an insulating plate inserted between the current collecting plate and the cylindrical can. ## Claims ### Claim 1 A secondary battery comprising: a cylindrical can having an opening; an electrode assembly which is accommodated in the opening of the cylindrical can and wound in a cylinder shape; a cap assembly which is electrically connected to the electrode assembly and seals the cylindrical can; a current collecting plate configured to electrically connect the electrode assembly to the cylindrical can; and an insulating plate interposed between the current collecting plate and the cylindrical can, wherein the current collecting plate comprises a current collecting flat portion that is electrically connected to the electrode assembly and a protrusion protruding from a center of the current collecting flat portion toward the cylindrical can, wherein the protrusion includes at least one opening, and the insulating plate comprises an insulating flat portion interposed between the current collecting flat portion and the cylindrical can and a through-hole having an inner diameter surface to which the opening of the protrusion is coupled. ### Claim 2 (depends on 1) The secondary battery of claim 1, wherein the protrusion comprises an inclined surface extending from the current collecting flat portion and a central flat portion extending from the inclined surface, wherein the opening is formed on the inclined surface. ### Claim 3 (depends on 2) The secondary battery of claim 2, wherein the central flat portion comprises a side protrusion protruding toward the opening. ### Claim 4 (depends on 2) The secondary battery of claim 2, wherein the central flat portion comprises a plurality of embossments welded to the cylindrical can. ### Claim 5 (depends on 1) The secondary battery of claim 1, wherein an inner diameter of the through-hole is less than an outer diameter of the protrusion. ### Claim 6 (depends on 1) The secondary battery of claim 1, wherein the insulating plate comprises at least one slit formed in a diameter direction from the through-hole. ### Claim 7 (depends on 1) The secondary battery of claim 1, wherein the insulating plate comprises a circumferential portion that wraps a circumference of the current collecting plate. ### Claim 8 (depends on 1) The secondary battery of claim 1, wherein the current collecting plate comprises copper or nickel, and the insulating plate comprises one kind or two or more kinds of materials selected from the group consisting of polypropylene (PP), polyethylene (PE), polyimide (PI), polybutyleneterephthalate (PBT), polycarbonate (PC), or polystyrene (PS).