# US 12,009,548 B2 · Battery cell structure and electrochemical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,548 B2 - Document ID: US12009548B2 - Status: Granted - Kind: B2 - Application number: 17/362,864 - Filed: 2021-06-29 - Published: 2022-02-03 - Granted: 2024-06-11 - Earliest claimed: 2020-07-30 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Xingguo Jiang; Yan Xu; Jiawei Wang; Xuchen Lian - Web page: https://patentgrep.com/patent/US12009548B2 ## CPC - H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 50/102: characterised by their shape or physical structure - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - 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 A battery cell structure includes a first electrode assembly formed by winding a first electrode plate and a second electrode plate, and a second electrode assembly formed by winding a third electrode plate and a fourth electrode plate. The first electrode assembly includes a first lateral surface and a second lateral surface opposite to the first lateral surface. The second electrode assembly includes a third lateral surface disposed opposite to the first lateral surface of the first electrode assembly. The battery cell structure further includes a first tab electrically connected to the third electrode plate and a second tab electrically connected to the fourth electrode plate. Both the first tab and the second tab extend through the first lateral surface and the second lateral surface. The first tab is further electrically connected to the first electrode plate located on the second lateral surface of the first electrode assembly. ## Claims ### Claim 1 A battery cell structure, comprising: a first electrode assembly formed by winding a first electrode plate, a first separator, a second separator, and a second electrode plate, the first electrode assembly comprises a first lateral surface and a second lateral surface opposite to the first lateral surface, the first electrode plate includes a positive active layer, and the second electrode plate includes a negative active layer; a second electrode assembly formed by winding a third electrode plate, a third separator, a fourth separator, and a fourth electrode plate, the second electrode assembly comprises a third lateral surface disposed adjacent to the first lateral surface of the first electrode assembly, the third lateral surface of the second electrode assembly facing the first lateral surface of the first electrode assembly; an insulation layer disposed between the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly, and in direct contact with both the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly, wherein the insulation layer is in physical contact with all of the first lateral surface of the first electrode assembly and a portion that is less than all of the third lateral surface of the second electrode assembly; a first tab electrically connected to the third electrode plate and a second tab electrically connected to the fourth electrode plate; the first tab and the second tab extend out of the third lateral surface of the second electrode assembly, and extend through the first lateral surface and the second lateral surface of the first electrode assembly; wherein, both the first tab and the second tab extend from the second electrode assembly to the first electrode assembly through the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly; and the first tab is electrically connected to the first electrode plate located on the second lateral surface of the first electrode assembly. ### Claim 2 (depends on 1) The battery cell structure according to claim 1, wherein the second tab is electrically connected to the second electrode plate located on the second lateral surface of the first electrode assembly. ### Claim 3 (depends on 2) The battery cell structure according to claim 2, wherein the first electrode assembly comprises n winding layers, an innermost winding layer of the first electrode assembly is defined as a 1st winding layer of the first electrode assembly, an outermost winding layer of the first electrode assembly is defined as an nth winding layer of the first electrode assembly, the second electrode assembly comprises m winding layers, an innermost winding layer of the second electrode assembly is defined as a 1st winding layer of the second electrode assembly, and an outermost winding layer of the second electrode assembly is defined as an mth winding layer of the second electrode assembly, wherein both n and m are positive integers greater than 1. ### Claim 4 (depends on 3) The battery cell structure according to claim 3, wherein the first tab is electrically connected to the first electrode plate on the nth winding layer of the first electrode assembly, and the second tab is electrically connected to the second electrode plate on the nth winding layer of the first electrode assembly. ### Claim 5 (depends on 4) The battery cell structure according to claim 4, wherein a first insulation layer is disposed between the first tab located in the first electrode assembly and the nth winding layer of the first electrode assembly, and a second insulation layer is disposed between the first tab located in the first electrode assembly and the second tab located in the first electrode assembly. ### Claim 6 (depends on 4) The battery cell structure according to claim 4, wherein the first tab is electrically connected to the third electrode plate on the 1st winding layer of the second electrode assembly, and the second tab is electrically connected to the fourth electrode plate on the 1st winding layer of the second electrode assembly. ### Claim 7 (depends on 4) The battery cell structure according to claim 4, wherein the first tab is electrically connected to the third electrode plate on the mth winding layer of the second electrode assembly, and the second tab is electrically connected to the fourth electrode plate on the mth winding layer of the second electrode assembly. ### Claim 8 (depends on 4) The battery cell structure according to claim 4, wherein the first tab is electrically connected to the third electrode plate on an ith winding layer of the second electrode assembly, and the second tab is electrically connected to the fourth electrode plate on a jth winding layer of the second electrode assembly, wherein both i and j are positive integers greater than 1 and less than m. ### Claim 9 (depends on 1) The battery cell structure according to claim 1, wherein a length of a tab extending out of the second electrode assembly is equal to a length of the first electrode assembly plus a preset length, and the preset length is less than or equal to 10 mm. ### Claim 10 (depends on 1) The battery cell structure according to claim 1, wherein the first electrode assembly and the second electrode assembly share a housing, and, when a main plane of the second electrode assembly is used as a line-of-sight plane, the first electrode assembly and the second electrode assembly form an L-shaped electrode assembly shape or a T-shaped electrode assembly shape. ### Claim 11 (depends on 1) The battery cell structure according to claim 1, wherein the first electrode plate and the second electrode plate are wound around a first reel to form the first electrode assembly, the third electrode plate and the fourth electrode plate are wound around a second reel to form the second electrode assembly, and the first reel is parallel or perpendicular to the second reel. ### Claim 12 (depends on 1) The battery cell structure according to claim 1, wherein the first tab is formed by cutting a current collector of the third electrode plate, and the second tab is formed by cutting a current collector of the fourth electrode plate. ### Claim 13 An electrochemical device, comprising a battery cell structure, and the battery cell structure comprising: a first electrode assembly formed by winding a first electrode plate, a first separator, a second separator, and a second electrode plate, the first electrode assembly comprises a first lateral surface and a second lateral surface opposite to the first lateral surface, the first electrode plate includes a positive active layer, and the second electrode plate includes a negative active layer; a second electrode assembly formed by winding a third electrode plate, a third separator, a fourth separator, and a fourth electrode plate, the second electrode assembly comprises a third lateral surface disposed adjacent to the first lateral surface of the first electrode assembly, the third lateral surface of the second electrode assembly facing the first lateral surface of the first electrode assembly; an insulation layer disposed between the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly, and in direct contact with both the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly, wherein the insulation layer is in physical contact with all of the first lateral surface of the first electrode assembly and a portion that is less than all of the third lateral surface of the second electrode assembly; a first tab electrically connected to the third electrode plate and a second tab electrically connected to the fourth electrode plate; the first tab and the second tab extend out of the third lateral surface of the second electrode assembly, and extend through the first lateral surface and the second lateral surface of the first electrode assembly; wherein, both the first tab and the second tab extend from the second electrode assembly to the first electrode assembly through the first lateral surface of the first electrode assembly and the third lateral surface of the second electrode assembly; and the first tab is electrically connected to the first electrode plate located on the second lateral surface of the first electrode assembly. ### Claim 14 (depends on 13) The electrochemical device according to claim 13, wherein the second tab is electrically connected to the second electrode plate located on the second lateral surface of the first electrode assembly. ### Claim 15 (depends on 14) The electrochemical device according to claim 14, wherein the first electrode assembly comprises n winding layers, an innermost winding layer of the first electrode assembly is defined as a 1st winding layer of the first electrode assembly, an outermost winding layer of the first electrode assembly is defined as an nth winding layer of the first electrode assembly, the second electrode assembly comprises m winding layers, an innermost winding layer of the second electrode assembly is defined as a 1st winding layer of the second electrode assembly, and an outermost winding layer of the second electrode assembly is defined as an mth winding layer of the second electrode assembly, wherein both n and m are positive integers greater than 1.