# US 2025/0158079 A1 · Cylindrical cell and cylindrical secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0158079 A1 - Document ID: US20250158079A1 - Status: Published application - Kind: A1 - Application number: 19/028,105 - Filed: 2025-01-17 - Published: 2025-05-15 - Earliest claimed: 2022-10-24 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Shenzhao QIU; Yulong DONG - Web page: https://patentgrep.com/patent/US20250158079A1 ## CPC - H01M 4/70: characterised by shape or form - H01M 10/0422: {Cells or battery with cylindrical casing} - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 50/595: Tapes - 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 cylindrical cell includes a first electrode plate, a separator, and a second electrode plate. The first electrode plate includes a first current collector, the first current collector is provided with a first blank foil region along an axial direction of the cylindrical cell, and the first blank foil region has a first chamfer at a terminating end of a winding direction of the cylindrical cell; and/or the second electrode plate includes a second current collector, the second current collector is provided with a second blank foil region along an axial direction of the cylindrical cell, and the second blank foil region has a second chamfer at a terminating end of a winding direction of the cylindrical cell. In this application, lengths of a first distance and a second 10 distance of the first chamfer and/or the second chamfer are controlled to be within appropriate ranges. ## Claims ### Claim 1 A cylindrical cell, comprising a first electrode plate, a separator, and a second electrode plate; wherein the first electrode plate, the separator, and the second electrode plate are sequentially stacked and wound to form the cylindrical cell; wherein the first electrode plate comprises a first current collector, the first current collector is provided with a first blank foil region along an axial direction of the cylindrical cell, and the first blank foil region has a first chamfer at a terminating end along a winding direction of the cylindrical cell. ### Claim 2 (depends on 1) The cylindrical cell according to claim 1, wherein the first chamfer has a length a along a first direction, the first chamfer has a length b along a second direction, and the first blank foil region has a length c along the second direction, satisfying 0.3c≤a≤2c and 0.3c≤b≤c; wherein the first direction is a length direction of the first current collector; and the second direction is a width direction of the first current collector. ### Claim 3 (depends on 1) The cylindrical cell according to claim 1, wherein the second electrode plate comprises a second current collector, the second current collector is provided with a second blank foil region along an axial direction of the cylindrical cell, the second blank foil region has a second chamfer at a terminating end along a winding direction of the cylindrical cell, the second chamfer has a length a′ along a first direction, the second chamfer has a length b′ along a second direction, and the second blank foil region has a length c′ along the second direction, satisfying 0.3c′≤a′≤2c′ and 0.3c′≤b′≤c′; wherein the first direction is a length direction of the second current collector; and the second direction is a width direction of the second current collector. ### Claim 4 (depends on 2) The cylindrical cell according to claim 2, wherein 0.6c≤a≤1.6c and 0.5c≤b≤0.8c. ### Claim 5 (depends on 3) The cylindrical cell according to claim 3, wherein 0.6c′≤a′≤1.6c′ and 0.5c′≤b′≤0.8c′. ### Claim 6 (depends on 1) The cylindrical cell according to claim 1, wherein the second electrode plate comprises a second current collector, the second current collector is provided with a second blank foil region along an axial direction of the cylindrical cell, an insulating adhesive paper is provided around the periphery of a flattened surface formed by flattening the first blank foil region and/or the second blank foil region, and an overlapping region is formed by overlap of the insulating adhesive paper at a surrounding joint. ### Claim 7 (depends on 6) The cylindrical cell according to claim 6, wherein the overlapping region has a length of 1 mm to 10 mm along the winding direction. ### Claim 8 (depends on 6) The cylindrical cell according to claim 6, wherein the overlapping region is not overlap with a terminating position of the electrode plate and/or the separator. ### Claim 9 (depends on 6) The cylindrical cell according to claim 6, wherein an ending adhesive paper is provided around the periphery of a middle portion of the cylindrical cell, and an end of the insulating adhesive paper towards the ending adhesive paper along the axial direction does not overlap with the ending adhesive paper. ### Claim 10 (depends on 9) The cylindrical cell according to claim 9, wherein when viewed from a battery height direction, a projection of the insulating adhesive paper and a projection of the flattened surface overlap by a length of 2 mm to 10 mm along the axial direction. ### Claim 11 (depends on 6) The cylindrical cell according to claim 6, wherein the cylindrical cell further comprises a current collector disc; wherein the flattened surface formed by flattening the first blank foil region and/or the second blank foil region is electrically connected to the current collector disc. ### Claim 12 (depends on 1) A cylindrical secondary battery, wherein the cylindrical secondary battery comprises the cylindrical cell according to claim 1. ### Claim 13 (depends on 12) The cylindrical secondary battery according to claim 12, wherein the first chamfer has a length a along a first direction, the first chamfer has a length b along a second direction, and the first blank foil region has a length c along the second direction, satisfying 0.3c≤a≤2c and 0.3c≤b≤c; wherein the first direction is a length direction of the first current collector; and the second direction is a width direction of the first current collector. ### Claim 14 (depends on 12) The cylindrical secondary battery according to claim 12, wherein the second electrode plate comprises a second current collector, the second current collector is provided with a second blank foil region along an axial direction of the cylindrical cell, the second blank foil region has a second chamfer at a terminating end along a winding direction of the cylindrical cell, the second chamfer has a length a′ along a first direction, the second chamfer has a length b′ along a second direction, and the second blank foil region has a length c′ along the second direction, satisfying 0.3c′≤a′≤2c′ and 0.3c′≤b′≤c′; wherein the first direction is a length direction of the second current collector; and the second direction is a width direction of the second current collector. ### Claim 15 (depends on 12) The cylindrical secondary battery according to claim 12, wherein an insulating adhesive paper is provided around the periphery of a flattened surface formed by flattening the first blank foil region and/or the second blank foil region, and an overlapping region is formed by overlap of the insulating adhesive paper at a surrounding joint. ### Claim 16 (depends on 15) The cylindrical secondary battery according to claim 15, wherein the overlapping region has a length of 1 mm to 10 mm along the winding direction. ### Claim 17 (depends on 15) The cylindrical secondary battery according to claim 15, wherein is not overlap with a terminating position of the electrode plate and/or the separator. ### Claim 18 (depends on 12) The cylindrical secondary battery according to claim 12, wherein an ending adhesive paper is provided around the periphery of a middle portion of the cylindrical cell, and an end of the insulating adhesive paper towards the ending adhesive paper along the axial direction does not overlap with the ending adhesive paper. ### Claim 19 (depends on 18) The cylindrical secondary battery according to claim 18, wherein when viewed from a battery height direction, a projection of the insulating adhesive paper and a projection of the flattened surface overlap by a length of 2 mm to 10 mm along the axial direction. ### Claim 20 (depends on 12) The cylindrical secondary battery according to claim 12, wherein the cylindrical cell further comprises a current collector disc; wherein the flattened surface formed by flattening the first blank foil region and/or the second blank foil region is electrically connected to the current collector disc.