# US 2026/0066491 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 2026/0066491 A1 - Document ID: US20260066491A1 - Status: Published application - Kind: A1 - Application number: 19/386,095 - Filed: 2025-11-11 - Published: 2026-03-05 - Earliest claimed: 2022-01-20 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Hyun Ki JUNG - Web page: https://patentgrep.com/patent/US20260066491A1 ## CPC - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/179: for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence) - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - H01M 50/548: on opposite sides of the cell - H01M 50/566: by welding, soldering or brazing - 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 includes: an electrode assembly, a case accommodating the electrode assembly, a cap plate sealing the case; and a current collector plate welded between the electrode assembly and the case or between the electrode assembly and the cap plate. The current collector plate has a slit therein. ## Claims ### Claim 1 A secondary battery comprising: a can; an electrode assembly accommodated in the can; and a current collector plate coupled to the electrode assembly, wherein the electrode assembly comprises a first electrode, a second electrode, and a separator between the first electrode and the second electrode, wherein the current collector plate comprises a body having a plurality of slits, a cantilever disposed inside each of the slits, and a center portion disposed at the center of the current collector plate, and wherein the cantilever is coupled to the electrode assembly. ### Claim 2 (depends on 1) The secondary battery of claim 1, wherein the can comprises an upper surface portion including a terminal hole, and a side surface portion, and wherein a terminal is inserted into the terminal hole. ### Claim 3 (depends on 2) The secondary battery of claim 2, wherein the current collector plate is coupled to the first electrode and the terminal. ### Claim 4 (depends on 2) The secondary battery of claim 2, wherein the cantilever is coupled to the first electrode, and wherein the center portion is coupled to the terminal. ### Claim 5 (depends on 4) The secondary battery of claim 4, wherein the current collector plate comprises a first surface facing the electrode assembly and a second surface facing the upper surface portion, wherein the current collector plate and the first electrode are coupled to the first surface, and wherein the current collector plate and the terminal are coupled to the second surface. ### Claim 6 (depends on 4) The secondary battery of claim 4, wherein a width of the cantilever varies while extending in a longitudinal direction of the cantilever. ### Claim 7 (depends on 4) The secondary battery of claim 4, wherein a first end and a second end of the slit are spaced apart from each other. ### Claim 8 (depends on 4) The secondary battery of claim 4, wherein the cantilever and an edge of the body are connected. ### Claim 9 (depends on 4) The secondary battery of claim 4, wherein the slit is formed by a straight line and a curve. ### Claim 10 (depends on 4) The secondary battery of claim 4, wherein the cantilever comprises first cantilevers facing in a first direction and second cantilevers facing in a second direction that is different from the first direction. ### Claim 11 (depends on 10) The secondary battery of claim 10, wherein an area of each of the cantilevers is greater than an area of the center portion. ### Claim 12 (depends on 10) The secondary battery of claim 10, wherein a first distance between the first cantilevers and a second distance between the first cantilever and the second cantilever are different. ### Claim 13 (depends on 12) The secondary battery of claim 12, wherein the cantilever comprises a welding region, and wherein a length of the welding region is different from the first distance and the second distance. ### Claim 14 (depends on 13) The secondary battery of claim 13, wherein the length of the welding region is greater than the first distance and the second distance. ### Claim 15 (depends on 10) The secondary battery of claim 10, wherein a first distance between the first cantilevers is greater than a second distance between the first cantilever and the second cantilever. ### Claim 16 (depends on 4) The secondary battery of claim 4, wherein the cantilever and the center portion are formed to move in opposite directions. ### Claim 17 (depends on 4) The secondary battery of claim 4, wherein the cantilever is formed to move in the direction of the electrode assembly, and wherein the center portion is formed to move in the direction of the upper surface portion. ### Claim 18 (depends on 1) The secondary battery of claim 1, wherein the current collector plate comprises a first current collector plate coupled to the first electrode and a second current collector plate coupled to the second electrode. ### Claim 19 (depends on 18) The secondary battery of claim 18, further comprising further comprising a cap plate coupled to an opening in the can, and wherein the cap plate comprises at least one notch. ### Claim 20 (depends on 19) The secondary battery of claim 19, wherein the first electrode is a positive electrode, wherein the second electrode is a negative electrode, and wherein the second current collector plate comprises a planar portion between the electrode assembly and the cap plate and an extending portion extending downwardly from an edge of the planar portion.