# US 2025/0096441 A1 · Cylindrical battery and battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0096441 A1 - Document ID: US20250096441A1 - Status: Published application - Kind: A1 - Application number: 18/885,638 - Filed: 2024-09-14 - Published: 2025-03-20 - Earliest claimed: 2023-09-15 - Assignees: Huizhou Eve Power Co., Ltd; Eve Power Co., Ltd. - Applicants: Huizhou Eve Power Co., Ltd.; Eve Power Co., Ltd. - Inventors: Mengsi CHENG; Chao WANG; Hanmin ZENG; Wei HE; Jincheng LIU - Web page: https://patentgrep.com/patent/US20250096441A1 ## CPC - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 4/366: {as layered products} - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors} - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - 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 battery includes a housing, an electrode assembly, and a first insulating layer. The housing includes a receiving cavity. The electrode assembly is disposed within the receiving cavity. The electrode assembly includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet has a positive electrode tab, the negative electrode sheet has a negative electrode tab, and the positive electrode tab and the negative electrode tab are disposed at two ends of the electrode assembly, respectively. The first insulating layer is provided on a surface of the negative electrode sheet toward the separator and is disposed away from the negative electrode tab. ## Claims ### Claim 1 A cylindrical battery, comprising: a housing having a receiving cavity; an electrode assembly disposed within the receiving cavity, wherein the electrode assembly comprises a positive electrode sheet, a separator, and a negative electrode sheet which are stacked and wound, and a positive electrode tab of the positive electrode sheet and a negative electrode tab of the negative electrode sheet are disposed at two ends of the electrode assembly, respectively; and a first insulating layer provided on a surface of the negative electrode sheet toward the separator and disposed at an end, away from the negative electrode tab, of the surface. ### Claim 2 (depends on 1) The cylindrical battery according to claim 1, wherein the first insulating layer has a dimension d in a thickness direction of the negative electrode sheet, the dimension d satisfying d ≤ s π - 2 ⁢ r - ( 2 ⁢ n - 1 ) ⁢ nD n ⁢ ( n + 1 ) - a - 2 ⁢ b ; wherein S is a length (mm) of the negative electrode sheet; r is a radius (mm) of a winding needle used for winding to form the electrode assembly; a is a thickness (mm) of the positive electrode sheet; b is a thickness (mm) of the separator; D is a thickness (mm) of the negative electrode sheet; and n is a number of turns that the negative electrode sheet is wound. ### Claim 3 (depends on 2) The cylindrical battery according to claim 2, wherein the dimension d of the first insulating layer in the thickness direction of the negative electrode sheet further satisfies 90 ⁢ % ≤ π [ r + n ⁢ ( d + a + 2 ⁢ b ) + 2 ⁢ n - 1 2 ⁢ D ] 2 π ⁢ R 2 ≤ 98 ⁢ % ; wherein R is a radius (mm) of the housing. ### Claim 4 (depends on 1) The cylindrical battery according to claim 1, wherein the first insulating layer comprises a plurality of first sub-insulating layers, the plurality of first sub-insulating layers are provided on a same side of the negative electrode sheet, and the plurality of first sub-insulating layers are stacked sequentially along a thickness direction of the negative electrode sheet. ### Claim 5 (depends on 1) The cylindrical battery according to claim 1, wherein the first insulating layer comprises a plurality of first sub-insulating layers; the negative electrode sheet has a first side and a second side which are opposite each other, part of the plurality of first sub-insulating layers are provided on the first side, and the remaining of the plurality of first sub-insulating layers are provided on the second side; and the part of first sub-insulating layers or the remaining of first sub-insulating layers are sequentially stacked along a thickness direction of the negative electrode sheet. ### Claim 6 (depends on 2) The cylindrical battery according to claim 2, wherein the first insulating layer comprises a plurality of first sub-insulating layers; the negative electrode sheet has a first side and a second side which are opposite each other, part of the plurality of first sub-insulating layers are provided on the first side, and the remaining of the plurality of first sub-insulating layers are provided on the second side; and the part of first sub-insulating layers or the remaining of first sub-insulating layers are sequentially stacked along the thickness direction of the negative electrode sheet. ### Claim 7 (depends on 3) The cylindrical battery according to claim 3, wherein the first insulating layer comprises a plurality of first sub-insulating layers; the negative electrode sheet has a first side and a second side which are opposite each other, part of the plurality of first sub-insulating layers are provided on the first side, and the remaining of the plurality of first sub-insulating layers are provided on the second side; and the part of first sub-insulating layers or the remaining of first sub-insulating layers are sequentially stacked along the thickness direction of the negative electrode sheet. ### Claim 8 (depends on 4) The cylindrical battery according to claim 4, wherein from one side of the negative electrode sheet to the other side of the negative electrode sheet, dimensions of the plurality of first sub-insulating layers in the thickness direction of the negative electrode sheet are d1, d2, . . . , di, the dimensions satisfying 0.15