# US 11,114,701 B2 · Method of producing an electrode-separator winding, electrode-separator winding and button cell with such a winding > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,701 B2 - Document ID: US11114701B2 - Status: Granted - Kind: B2 - Application number: 16/519,773 - Filed: 2019-07-23 - Published: 2020-02-06 - Granted: 2021-09-07 - Earliest claimed: 2018-07-31 - Assignees: VARTA Microbattery GmbH - Applicants: VARTA Microbattery GmbH - Inventors: Winfried Gaugler; Wolfgang Maas - Web page: https://patentgrep.com/patent/US11114701B2 ## CPC - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 10/0427: {Button cells} - 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 - 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 method of producing an electrode-separator winding includes feeding a first current collector, feeding a second current collector, feeding two separators in strip form to a winding device, and winding the first and second current collectors and the separators to form a winding with a sequence, wherein a contact strip is welded on at least one of the contact sections of the current collectors, or at least one of the contact sections is folded over to form a contact strip, and at least one of the separators is reinforced in at least one risk region in which the at least one separator within the completed electrode-separator winding lies against the at least one contact section in which the contact strip is welded on or against the at least one contact section folded over to form a contact strip. ## Claims ### Claim 1 A method of producing an electrode-separator winding comprising: feeding a first current collector in strip form, which is divided in the longitudinal direction into mass sections covered with a positive electrode material and, arranged between the mass sections, contact sections not covered with the electrode material, to a winding device, feeding a second current collector in strip form, which is divided in the longitudinal direction into mass sections covered with a negative electrode material and, arranged between the mass sections, contact sections not covered with the electrode material, to the winding device, feeding two separators in strip form to the winding device, and winding up the first current collector in strip form, the second current collector in strip form and the separators in the winding device to form a winding with the sequence first current collector/separator/second current collector/separator or second current collector/separator/first current collector/separator, wherein a contact strip is welded on in at least one of the contact sections for the electrical contacting of the current collectors, or at least one of the contact sections is folded over to form a contact strip for the electrical contacting of the current collectors, and at least one of the separators is reinforced in a Z-shaped folding and at least one risk region in which the at least one separator within the completed electrode-separator winding lies against the at least one contact section in which the contact strip is welded on or against the at least one contact section folded over to form a contact strip. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: the first current collector and second current collector are cut through in the region of two contact sections, each forming a contact section at the end, and the separators are cut through, each forming a separator section at the end; and the electrode-separator winding is completed by winding up the contact sections at the ends and the separator sections at the ends. ### Claim 3 (depends on 2) The method according to claim 2, with the additional step that to form the contact strip for the electrical contacting of the current collectors, at least one of the contact sections at the ends is folded over. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: to reinforce the separators, in the at least one risk region a film that can be welded to the separators is fixed in one or more layers on the separator. ### Claim 5 (depends on 4) The method according to claim 4, with the additional step that the fixing is performed by welding. ### Claim 6 (depends on 4) The method according to claim 4, wherein a film of the same material as the separator is used as the film. ### Claim 7 (depends on 1) The method according to claim 1, wherein the at least one reinforcement is formed by Z folding. ### Claim 8 An electrode-separator winding, comprising: a first current collector in strip form, which is divided in the longitudinal direction into at least one mass section covered with a positive electrode material and at least one contact section not covered with the electrode material, a second current collector in strip form, which is divided in the longitudinal direction into at least one mass section covered with a negative electrode material and at least one contact section not covered with the electrode material, two separators in strip form wherein the first current collector in strip form, the second current collector in strip form and the separators are wound up to form a winding with the sequence first current collector/separator/second current collector/separator or second current collector/separator/first current collector/separator, a contact strip is welded on in at least one of the contact sections for the electrical contacting of the current collectors, or at least one of the contact sections is folded over to form a contact strip for the electrical contacting of the current collectors, and at least one of the separators is reinforced in a Z-shaped folding and at least one risk region in which the at least one separator within the electrode-separator winding lies against the at least one contact section in which the contact strip is welded on or against the at least one contact section folded over to form a contact strip. ### Claim 9 (depends on 8) A button cell comprising the electrode-separator winding according to claim 8.