# US 2026/0100488 A1 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100488 A1 - Document ID: US20260100488A1 - Status: Published application - Kind: A1 - Application number: 19/417,995 - Filed: 2025-12-12 - Published: 2026-04-09 - Earliest claimed: 2021-12-08 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Hyun Soo LEE; Jun Sun YONG - Web page: https://patentgrep.com/patent/US20260100488A1 ## CPC - H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection - H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence) - H01M 50/531: Electrode connections inside a battery casing - 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 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 50/55: on the same side of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/566: by welding, soldering or brazing - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - 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 A secondary battery, according to embodiments of the present disclosure, exhibits a reduced decrease in capacity by slimming a current collecting structure. By reducing the space occupied by the current collecting structure in the longitudinal direction of an electrode assembly, the size of the electrode assembly may be increased. ## Claims ### Claim 1 A cap assembly comprising: a cap plate; a terminal part disposed at one side of the cap plate; and a current collecting part comprising a sub-plate electrically connected to the terminal part, wherein the sub-plate comprises a plurality of concave welding grooves on at least one plate surface. ### Claim 2 (depends on 1) The cap assembly of claim 1, wherein the cap plate comprises a rectangular plate shape, and wherein the terminal part comprises a first terminal part and a second terminal part disposed apart from each other along a longitudinal direction of the cap plate. ### Claim 3 (depends on 2) The cap assembly of claim 2, wherein the sub-plate is disposed perpendicular to the cap plate. ### Claim 4 (depends on 3) The cap assembly of claim 3, wherein the current collecting part further comprises: a current collector electrically connected to the terminal part and the sub-plate; and a connection plate electrically connecting the current collector and the sub-plate. ### Claim 5 (depends on 4) The cap assembly of claim 4, wherein one end of the connection plate is disposed parallel to the current collector, and the other end is bent and disposed parallel to the sub-plate. ### Claim 6 (depends on 5) The cap assembly of claim 5, wherein the sub-plate comprises a first connection part protruding convexly outward from a plate surface and a plurality of second connection parts electrically connected to an electrode assembly of a secondary battery and spaced apart from each other, and wherein portions between the second connection parts protrude convexly outward from the plate surface. ### Claim 7 (depends on 6) The cap assembly of claim 6, wherein the welding grooves are provided on an outer plate surface of the second connection parts. ### Claim 8 (depends on 4) The cap assembly of claim 4, wherein the first terminal part is insulated from the cap plate, and wherein the second terminal part is electrically connected to the cap plate. ### Claim 9 (depends on 8) The cap assembly of claim 8, wherein the first terminal part comprises: a first terminal pin coupled to and electrically connected to a first current collector; and a first terminal plate coupled to and electrically connected to the first terminal pin, and wherein the second terminal part comprises: a second terminal pin coupled to and electrically connected to a second current collector; a second terminal plate coupled to and electrically connected to the second terminal pin, and a conductive plate. ### Claim 10 (depends on 9) The cap assembly of claim 9, further comprising an insulating member formed of an insulating material, wherein the insulating member is respectively disposed between the cap plate and the first current collector, between the cap plate and the second current collector, beneath the first current collector, beneath the second current collector, and between the first terminal plate and the cap plate. ### Claim 11 A secondary battery comprising: a case comprising an opening at one side; an electrode assembly accommodated in the case and comprising a first substrate tab and a second substrate tab disposed in opposite directions along a longitudinal direction of the case; and a cap assembly, the cap assembly comprising: a cap plate coupled to the opening of the case; a first terminal part disposed at one side of the cap plate; a second terminal part disposed at the other side of the cap plate; a first current collecting part comprising a sub-plate electrically connected to the first terminal part; and a second current collecting part comprising a sub-plate electrically connected to the second terminal part, wherein the sub-plate of each of the first current collecting part and the second current collecting part comprises a plurality of concave welding grooves on at least one plate surface, and wherein the first substrate tab and the second substrate tab are welded to the welding grooves. ### Claim 12 (depends on 11) The secondary battery of claim 11, wherein the cap plate comprises a rectangular plate shape, and wherein the first terminal part and the second terminal part are respectively disposed near both ends of the cap plate in the longitudinal direction. ### Claim 13 (depends on 12) The secondary battery of claim 12, wherein the case comprises a rectangular parallelepiped shape, and wherein the sub-plate of the first current collecting part and the sub-plate of the second current collecting part are respectively disposed parallel to longitudinal end portions of the case. ### Claim 14 (depends on 13) The secondary battery of claim 13, wherein the first current collecting part further comprises: a first current collector disposed parallel to the cap plate and electrically connected to the first terminal part and the sub-plate; and a first connection plate electrically connecting the first current collector and the sub-plate, and wherein the second current collecting part further comprises: a second current collector disposed parallel to the cap plate and electrically connected to the second terminal part and the sub-plate; and a second connection plate electrically connecting the second current collector and the sub-plate. ### Claim 15 (depends on 14) The secondary battery of claim 14, wherein the first connection plate is bent at a central portion such that one bent end is disposed parallel to the first current collector and the other bent end is disposed parallel to the sub-plate, and wherein the second connection plate is bent at a central portion such that one bent end is disposed parallel to the second current collector and the other bent end is disposed parallel to the sub-plate. ### Claim 16 (depends on 15) The secondary battery of claim 15, wherein the sub-plate of each of the first current collecting part and the second current collecting part comprises a first connection part protruding convexly toward the case, and a second connection part protruding convexly toward the electrode assembly. ### Claim 17 (depends on 16) The secondary battery of claim 16, wherein the welding grooves are provided on a plate surface of the second connection part facing the case. ### Claim 18 (depends on 14) The secondary battery of claim 14, wherein the first terminal part is insulated from the cap plate, and the second terminal part is electrically connected to the cap plate. ### Claim 19 (depends on 18) The secondary battery of claim 18, wherein the first terminal part comprises a first terminal pin coupled to and electrically connected to the first current collector, and a first terminal plate coupled to and electrically connected to the first terminal pin, and wherein the second terminal part comprises a second terminal pin coupled to and electrically connected to the second current collector, a second terminal plate coupled to and electrically connected to the second terminal pin, and a conductive plate. ### Claim 20 (depends on 19) The secondary battery of claim 19, further comprising an insulating member formed of an insulating material, wherein the insulating member is respectively disposed between the cap plate and the first current collector, between the cap plate and the second current collector, beneath the first current collector, beneath the second current collector, and between the first terminal plate and the cap plate.