# US 12,009,534 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 12,009,534 B2 - Document ID: US12009534B2 - Status: Granted - Kind: B2 - Application number: 17/291,856 - Filed: 2020-01-31 - Published: 2022-01-13 - Granted: 2024-06-11 - Earliest claimed: 2019-02-01 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Hyoung Kwon Kim; Hyeon Soo Sim; Ha Young Heo; Duk Hyun Ryu; Nam Won Kim - Web page: https://patentgrep.com/patent/US12009534B2 ## CPC - H01M 50/166: characterised by the methods of assembling casings with lids - H01M 50/342: Non-re-sealable arrangements - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - 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 50/30: Arrangements for facilitating escape of gases - H01M 50/578: in response to pressure - H01M 50/581: in response to temperature - H01M 2200/10: Temperature sensitive devices - H01M 2200/20: Pressure-sensitive 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 - 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 According to one aspect of the present invention, a secondary battery has a bent part disposed on an end of an upper portion of the battery can. The bent part is bent inward toward a top cap to fix the top cap. The secondary battery is configured such that, when an internal pressure of the battery can exceeds a predetermined value, a region (R) in which the top cap and the bent part overlap each other when viewed from above is reduced by deformation of the top cap or the bent part to allow an entire region of the top cap to become spaced further from the battery can. ## Claims ### Claim 1 A secondary battery comprising: An electrode assembly; A battery can configured to accommodate the electrode assembly and having an open upper portion; and A top cap bonded to the upper portion of the battery can, a terminal region protruding upward from the top cap having a wall thickness (t2), Wherein an end of the upper portion of the battery can includes a bent part that is bent inward toward the top cap to fix the top cap, Wherein the secondary battery is configured such that, when an internal pressure of the battery can exceeds a predetermined value, a region (R) in which the top cap and the bent part overlap each other when viewed from above is reduced by deformation of the top cap or the bent part so as to allow the top cap to be displaced with respect to the battery can in a direction away from the electrode assembly, Wherein the battery can has a width (W) defined orthogonally to a longitudinal axis of the battery can, the bent part having a bent length (A) extending towards the longitudinal axis, and a ratio A/W of the bent length (A) of the bent part to the width (W) of the battery can ranging from 2.27×10−2 to 7.5×10−2, and wherein a ratio A/t2 of the bent length (A) of the bent part to the wall thickness (t2) of the terminal region of the top cap ranges from 1 to 5. ### Claim 2 (depends on 1) The secondary battery of claim 1, wherein the secondary battery is configured such that, when the internal pressure of the battery can exceeds the predetermined value, the top cap becomes displaced with respect to the battery can as a single piece, without being fragmented into a plurality of fragments. ### Claim 3 (depends on 2) The secondary battery of claim 2, wherein the secondary battery is configured such that, when the internal pressure of the battery can exceeds the predetermined value, the bent becomes less bent to allow the top can to become displaced with respect to the battery can. ### Claim 4 (depends on 2) The secondary battery of claim 2, wherein the secondary battery is configured such that, when the internal pressure of the battery can exceeds the predetermined value, a central portion of the top cap is bent upward. ### Claim 5 (depends on 3) The secondary battery of claim 3, wherein the predetermined value is within a range of 30 kgf/cm2 to 60 kgf/cm2. ### Claim 6 (depends on 1) The secondary battery of claim 1, wherein the bent part has a wall thickness (t1), And A ratio A/t1 of the bent length (A) of the bent part to the wall thickness (t1) of the bent part ranges from 1.43 to 6. ### Claim 7 (depends on 1) The secondary battery of claim 1, wherein the bent length (A) of the bent part ranges from 0.5 mm to 1.5 mm. ### Claim 8 (depends on 1) The secondary battery of claim 1, wherein the width (W) of the battery can ranges from 20 mm to 22 mm. ### Claim 9 (depends on 6) The secondary battery of claim 6, wherein the thickness (t1) of the bent part ranges from 0.25 mm to 0.35 mm. ### Claim 10 (depends on 1) The secondary battery of claim 1, wherein the thickness (t2) of the terminal region of the top cap ranges from 0.3 mm to 0.5 mm. ### Claim 11 (depends on 1) The secondary battery of claim 1, wherein the battery can comprises an iron (Fe) material coated with nickel (Ni). ### Claim 12 (depends on 4) The secondary battery of claim 4, wherein the predetermined value is within a range of 30 kgf/cm2 to 60 kgf/cm2.