# US 2021/0242545 A1 · Electrode assembly, secondary battery including same, and method for manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242545 A1 - Document ID: US20210242545A1 - Status: Published application - Kind: A1 - Application number: 17/049,758 - Filed: 2019-04-22 - Published: 2021-08-05 - Earliest claimed: 2018-04-24 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Hyun Ki JEONG; Min Yeol CHOI - Web page: https://patentgrep.com/patent/US20210242545A1 ## CPC - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - 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 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - H01M 50/466: U-shaped, bag-shaped or folded - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/548: on opposite sides of the cell - 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 The present invention provides an electrode assembly, which can reduce resistance and improve a process property, a secondary battery including same, and a method for manufacturing same. For example, disclosed is an electrode assembly comprising: a first electrode plate having a first electrode tab attached thereto: a plurality of second electrode plates having second electrode tabs attached thereto, respectively, and a separator interposed between the first electrode plate and the plurality of second electrode plates, wherein the first electrode plate, the separator, and the plurality of second electrode plates are wound in a state of being stacked on one another, and the second electrode tabs are formed to be symmetrical to each other on the basis of a winding center thereof. ## Claims ### Claim 1 An electrode assembly comprising: a first electrode plate, to which a first electrode tab is attached; a plurality of second electrode plates, to which second electrode tabs are attached, respectively; and a separator interposed between the first electrode plate and each of the plurality of second electrode plates, wherein the first electrode plate, the separators, and the plurality of second electrode plates are wound while being stacked, and wherein the second electrode tabs are formed to be symmetrical with respect to a winding center. ### Claim 2 (depends on 1) The electrode assembly of claim 1, wherein the first electrode tab is located at the winding center. ### Claim 3 (depends on 1) The electrode assembly of claim 1, wherein the plurality of second electrode plates are wound to be located on a first surface and a second surface of the first electrode plate, respectively. ### Claim 4 (depends on 1) The electrode assembly of claim 1, wherein the separator is provided in plurality to be wound so as to cover the plurality of second electrode plates, respectively. ### Claim 5 (depends on 4) The electrode assembly of claim 4, wherein the separators are folded to cover the plurality of second electrode plates, respectively, so that the plurality of second electrode plates are separated from the first electrode plate. ### Claim 6 (depends on 1) The electrode assembly of claim 1, wherein the first electrode tab and the second electrode tabs are located in a straight line on a cross-section that is perpendicular to a winding axis of the electrode assembly. ### Claim 7 (depends on 1) The electrode assembly of claim 1, wherein the plurality of second electrode plates are wound to be symmetrical to each other with reference to the first electrode plate, respectively. ### Claim 8 (depends on 1) A secondary battery comprising the electrode assembly of claim 1. ### Claim 9 A method for manufacturing an electrode assembly, the method comprising: coupling a mandrel to a first electrode plate, to which a first electrode tab is attached at a central portion thereof so that the first electrode tab is prepared to be located on the mandrel; locating a plurality of second electrode plates, to which second electrode tabs are attached, respectively, on a first surface and a second surface of the first electrode plate; and allowing the mandrel to rotate in one direction so as to perform winding. ### Claim 10 (depends on 9) The method of claim 9, wherein the plurality of second electrode plates are located on the first electrode plate while being covered by a plurality of separators, respectively.