# US 2026/0100455 A1 · Secondary battery and battery pack including the secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100455 A1 - Document ID: US20260100455A1 - Status: Published application - Kind: A1 - Application number: 19/281,935 - Filed: 2025-07-28 - Published: 2026-04-09 - Earliest claimed: 2024-10-04 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Il Oh SON - Web page: https://patentgrep.com/patent/US20260100455A1 ## CPC - H01M 50/147: Lids or covers - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - 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 a case having an opening formed therein, an electrode assembly accommodated in the case, a cap assembly closing the opening, and an electrode tab that is electrically connected to the electrode assembly and the cap assembly. A thickness of the electrode tab decreases from an end portion of the electrode tab toward a central portion of the electrode assembly in a height direction of the electrode assembly. ## Claims ### Claim 1 A secondary battery comprising: a case having an opening formed therein; an electrode assembly accommodated in the case; a cap assembly closing the opening; and an electrode tab that is electrically connected to the electrode assembly and the cap assembly, with a thickness of the electrode tab decreasing from an end portion of the electrode tab toward a central portion of the electrode assembly in a height direction of the electrode assembly. ### Claim 2 (depends on 1) The secondary battery as claimed in claim 1, wherein the cap assembly includes: a upper cap disposed at the opening; a lower cap disposed to face the upper cap and connected to the electrode assembly; and a bent plate disposed between the upper cap and the lower cap. ### Claim 3 (depends on 1) The secondary battery as claimed in claim 1, wherein a cross section of the electrode tab that is perpendicular to a longitudinal direction of the electrode tab is a quadrangular shape. ### Claim 4 (depends on 1) The secondary battery as claimed in claim 1, wherein a cross section of the electrode tab that is perpendicular to a longitudinal direction of the electrode tab is a closed curved shape. ### Claim 5 (depends on 1) The secondary battery as claimed in claim 1, wherein a width of the electrode tab is constant from the end portion toward the central portion of the electrode assembly in the height direction of the electrode assembly. ### Claim 6 (depends on 1) The secondary battery as claimed in claim 1, wherein a width of the electrode tab increases from the end portion toward the central portion of the electrode assembly in the height direction of the electrode assembly. ### Claim 7 (depends on 1) The secondary battery as claimed in claim 1, wherein the electrode tab is positioned at a center portion of the electrode assembly in a radial direction of the electrode assembly. ### Claim 8 (depends on 1) The secondary battery as claimed in claim 1, wherein the electrode tab is positioned at an outer portion of the electrode assembly in a radial direction of the electrode assembly. ### Claim 9 (depends on 1) The secondary battery as claimed in claim 1, wherein the electrode tab is positioned between a center portion and an outer portion of the electrode assembly in a radial direction of the electrode assembly. ### Claim 10 (depends on 1) The secondary battery as claimed in claim 1, wherein the electrode tab includes: a first electrode tab electrically connected to the cap assembly; and a second electrode tab electrically connected to the case. ### Claim 11 (depends on 10) The secondary battery as claimed in claim 10, wherein the first electrode tab and the second electrode tab are spaced apart from each other in a radial direction of the electrode assembly. ### Claim 12 (depends on 10) The secondary battery as claimed in claim 10, wherein the first electrode tab and the second electrode tab are overlap in a radial direction of the electrode assembly. ### Claim 13 (depends on 11) The secondary battery as claimed in claim 11, wherein the first electrode tab and the second electrode tab are spaced apart from each other in the height direction of the electrode assembly. ### Claim 14 (depends on 11) The secondary battery as claimed in claim 11, wherein the first electrode tab and the second electrode tab overlap in the height direction of the electrode assembly. ### Claim 15 A battery pack comprising: a housing; and a plurality of secondary batteries disposed in the housing, wherein each of the secondary batteries includes a case having an opening formed therein, an electrode assembly accommodated in the case, a cap assembly closing the opening, and an electrode tab that is electrically connected to the electrode assembly and the cap assembly, with a thickness of the electrode tab decreasing from an end portion of the electrode tab toward a central portion of the electrode assembly in a height direction of the electrode assembly. ### Claim 16 (depends on 15) The battery pack as claimed in claim 15, wherein a cross section of the electrode tab that is perpendicular to a longitudinal direction of the electrode tab is a quadrangular shape. ### Claim 17 (depends on 15) The battery pack as claimed in claim 15, wherein a a cross section of the electrode tab that is perpendicular to a longitudinal direction of the electrode tab is a closed curved shape. ### Claim 18 (depends on 15) The battery pack as claimed in claim 15, wherein a width of the electrode tab is constant from the end portion toward the central portion of the electrode assembly in the height direction of the electrode assembly.