# US 12,119,517 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 12,119,517 B2 - Document ID: US12119517B2 - Status: Granted - Kind: B2 - Application number: 16/979,727 - Filed: 2019-02-13 - Published: 2021-02-11 - Granted: 2024-10-15 - Earliest claimed: 2018-03-23 - Assignees: Panasonic Energy Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Norie Mantoku; Oose Okutani; Kyosuke Miyata - Web page: https://patentgrep.com/patent/US12119517B2 ## CPC - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 50/533: characterised by the shape of the leads or tabs - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 50/583: in response to current, e.g. fuses - 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 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/559: Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells (H01M50/553 takes precedence) - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/027: {Negative electrodes} - H01M 2004/028: {Positive electrodes} - 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 purpose of the present disclosure is to provide a secondary battery in which a current interruption function of an electrode tap can be enhanced during an external short circuit, and a temperature rise in the battery can be effectively suppressed. A secondary battery according to one embodiment of the present disclosure is provided with: an electrode assembly having a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode; a sealing assembly constituting a positive terminal; a case body constituting a negative terminal; a positive electrode tap connecting the positive electrode and the sealing assembly; and a negative electrode tap connecting the negative electrode and the case body, wherein the positive electrode has a fuse part which has a relatively small cross-sectional area in the positive electrode, and the fuse part of the positive electrode is metallurgically bonded to the sealing assembly. ## Claims ### Claim 1 A secondary battery, comprising: an electrode assembly having a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode; a positive electrode terminal; a negative electrode terminal; a positive electrode tab which connects the positive electrode and the positive electrode terminal; and a negative electrode tab which connects the negative electrode and the negative electrode terminal; wherein the positive electrode tab has a non-fuse part, and a fuse part smaller in sectional area than the non-fuse part, and the secondary battery further comprising: a section of the fuse part of the positive electrode tab in which at least one of the group consisting of one or more slits, a thin-walled portion, and a notch portion are/is formed in a longitudinal direction of the positive electrode tab, wherein the section is metallurgically bonded to the positive electrode terminal. ### Claim 2 A secondary battery, comprising: an electrode assembly having a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode; a positive electrode terminal; a negative electrode terminal; a positive electrode tab which connects the positive electrode and the positive electrode terminal; and a negative electrode tab which connects the negative electrode and the negative electrode terminal; wherein the negative electrode tab has a non-fuse part, and a fuse part smaller in sectional area than the non-fuse part, and the secondary battery further comprising: a section of the fuse part of the negative electrode tab in which at least one of the group consisting of one or more slits, a thin-walled portion, and a notch portion are/is formed in a longitudinal direction of the negative electrode tab, wherein the section is metallurgically bonded to the negative electrode terminal. ### Claim 3 (depends on 1) The secondary battery according to claim 1, having a case body that houses the electrode assembly and a sealing assembly that seals an opening in the case body, wherein one of the case body and the sealing assembly serves as the positive electrode terminal, and the other of the case body and the sealing assembly serves as the negative electrode terminal. ### Claim 4 (depends on 1) The secondary battery according to claim 1, wherein a sectional area of the fuse part is in the range from 0.19 to 0.48 mm2. ### Claim 5 (depends on 1) The secondary battery according to claim 1, wherein the positive electrode tab has a plurality of slits and the fuse part interposed between the plurality of slits. ### Claim 6 (depends on 2) The secondary battery according to claim 2, wherein the negative electrode tab has a plurality of slits and the fuse part interposed between the plurality of slits. ### Claim 7 (depends on 5) The secondary battery according to claim 5, wherein a width of one of the plurality of slits is in the range from 0.03 to 1.90 mm. ### Claim 8 (depends on 2) The secondary battery according to claim 2, having a case body that houses the electrode assembly and a sealing assembly that seals an opening in the case body, wherein one of the case body and the sealing assembly serves as the positive electrode terminal, and the other of the case body and the sealing assembly serves as the negative electrode terminal. ### Claim 9 (depends on 2) The secondary battery according to claim 2, wherein a sectional area of the fuse part is in the range from 0.19 to 0.48 mm2. ### Claim 10 (depends on 6) The secondary battery according to claim 6, wherein a width of one of the plurality of slits is in the range from 0.03 to 1.90 mm. ### Claim 11 (depends on 1) The secondary battery according to claim 1, wherein the section of the fuse part of the positive electrode tab is a section of the fuse part in which slits are formed. ### Claim 12 (depends on 2) The secondary battery according to claim 2, wherein the section of the fuse part of the negative electrode tab is a section of the fuse part in which slits are formed.