# US 2022/0045408 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 2022/0045408 A1 - Document ID: US20220045408A1 - Status: Published application - Kind: A1 - Application number: 17/506,817 - Filed: 2021-10-21 - Published: 2022-02-10 - Earliest claimed: 2019-04-25 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Naoto AKIZUKI; Masahiro OTSUKA; Morimichi OZAKI - Web page: https://patentgrep.com/patent/US20220045408A1 ## CPC - H01M 50/533: characterised by the shape of the leads or tabs - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - 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 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/124: having a layered structure - H01M 50/463: Separators, membranes or diaphragms characterised by their shape - H01M 50/545: formed by the casing of the cells (cup shaped terminals adapted for cells having curved cross-section H01M50/56) - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 50/593: Spacers; Insulating plates - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 50/105: Pouches or flexible bags - H01M 50/55: on the same side of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/562: characterised by the material - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - 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 Provided is a secondary battery including an electrode assembly and an electrolyte enclosed in an exterior case. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. In the secondary battery, the electrode assembly includes current collecting tabs of the positive electrode and the negative electrode protruding from the same end face, and the current collecting tabs of the positive electrode and the negative electrode are positioned at different distances from a central axis along a direction. ## Claims ### Claim 1 A secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte enclosed in an exterior case, wherein the electrode assembly includes current collecting tabs of the positive electrode and the negative electrode, the current collecting tabs protruding from a same end face of the electrode assembly, wherein the current collecting tabs of the positive electrode and the negative electrode are positioned at different distances from a central axis along a direction in which the current collecting tabs of the positive electrode and the negative electrode protrude in plain view of the electrode assembly, wherein the current collecting tabs of the positive electrode and the negative electrode each correspond to one of an outer current collecting tab relatively far from the central axis and an inner current collecting tab relatively close to the central axis in plain view of the electrode assembly, wherein a length dimension of the outer current collecting tab is larger than the inner current collecting tab, and wherein the current collecting tabs of the positive electrode and the negative electrode each have a bent shape. ### Claim 2 (depends on 1) The secondary battery according to claim 1, wherein the bent shape is a bowed shape bent in an arch shape. ### Claim 3 (depends on 1) The secondary battery according to claim 1, wherein both the inner current collecting tab and the outer current collecting tab having relatively different length dimensions extend to meander in the exterior case. ### Claim 4 (depends on 1) The secondary battery according to claim 1, wherein the inner current collecting tab and the outer current collecting tab have different spring elasticity. ### Claim 5 (depends on 1) The secondary battery according to claim 1, wherein spring elasticity of the outer current collecting tab is higher than the inner current collecting tab. ### Claim 6 (depends on 1) The secondary battery according to claim 1, wherein a Young's modulus of the outer current collecting tab is higher than the inner current collecting tab. ### Claim 7 (depends on 1) The secondary battery according to claim 1, wherein a tensile strength of the outer current collecting tab is higher than the inner current collecting tab. ### Claim 8 (depends on 1) The secondary battery according to claim 1, wherein a thickness dimension of the outer current collecting tab is larger than the inner current collecting tab. ### Claim 9 (depends on 1) The secondary battery according to claim 1, wherein a width dimension of the outer current collecting tab is larger than the inner current collecting tab. ### Claim 10 (depends on 1) The secondary battery according to claim 1, wherein the inner current collecting tab and the outer current collecting tab are disposed side by side to protrude in a same direction in plain view. ### Claim 11 (depends on 1) The secondary battery according to claim 1, wherein the electrode assembly has a separator extension portion in which the separator extends outward of the positive electrode and the negative electrode at an end face from which the current collecting tabs each protrude, and a portion having the bent shape of each of the current collecting tabs is in contact with the separator extension portion. ### Claim 12 (depends on 1) The secondary battery according to claim 1, wherein the electrode assembly includes a wound electrode assembly, and the positive electrode, the negative electrode, and the separator are wound. ### Claim 13 (depends on 11) The secondary battery according to claim 11, wherein the electrode assembly includes a wound electrode assembly, and the positive electrode, the negative electrode, and the separator are wound. ### Claim 14 (depends on 13) The secondary battery according to claim 13, wherein in sectional view of the secondary battery, at least part of the separator extension portion has a bent shape convex toward an outer periphery of the wound electrode assembly. ### Claim 15 (depends on 13) The secondary battery according to claim 13, wherein in sectional view of the secondary battery, the electrode assembly has a convergence portion at which the separator extension portion converges, and a portion having the bent shape of the current collecting tab is in contact with the convergence portion. ### Claim 16 (depends on 1) The secondary battery according claim 1, wherein an insulating material is provided at least at a portion having the bent shape in each of the current collecting tabs. ### Claim 17 (depends on 1) The secondary battery according to claim 1, wherein the exterior case further includes an electrode terminal structure for at least one of the positive electrode or the negative electrode, and is a conductive case type exterior case, and assumes a charge whose polarity is opposite to a polarity of the electrode terminal structure. ### Claim 18 (depends on 1) The secondary battery according to claim 1, wherein the exterior case is formed of a laminated film including a resin material and a metal material. ### Claim 19 (depends on 1) The secondary battery according to claim 1, wherein the positive electrode and the negative electrode are capable of absorbing and releasing lithium ions. ### Claim 20 (depends on 1) The secondary battery according to claim 1, wherein the secondary battery is included in a mobile device.