# US 2013/0280568 A1 · Energy storage device, winding apparatus, and winding method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0280568 A1 - Document ID: US20130280568A1 - Status: Published application - Kind: A1 - Application number: 13/864,133 - Filed: 2013-04-16 - Published: 2013-10-24 - Earliest claimed: 2012-04-18 - Assignees: GS Yuasa International Ltd. - Applicants: Gs Yuasa International, Ltd. - Inventors: Akihiko MIYAZAKI; Sumio MORI; Tomonori KAKO - Web page: https://patentgrep.com/patent/US20130280568A1 ## CPC - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 50/449: having a layered structure - H01M 50/451: comprising layers of only organic material and layers containing inorganic material - H01M 10/0468: {Compression means for stacks of electrodes and separators} - 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 - Y10T 29/49114: including adhesively bonding - Y10T 29/53135: Storage cell or battery - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Provided is an energy storage device which employs the use of a separator provided with a layer having poor thermal properties such as a heat resistant coated layer and is capable of inhibiting a decrease in performance. The energy storage device includes: a wound body including a positive electrode, a negative electrode, and separators which are layered and wound, the separators being interposed between the positive electrode and the negative electrode and having a first surface and a second surface, the first surface having thermal bonding properties superior to thermal bonding properties of the second surface; and an insulation sheet wound around an outermost layer of the wound body. At least one of the separators is bonded to the insulation sheet via the first surface thereof. ## Claims ### Claim 1 An energy storage device comprising: a wound body including a positive electrode, a negative electrode, and a separator which are layered and wound, the separator being interposed between the positive electrode and the negative electrode and having a first surface and a second surface, the first surface having thermal bonding properties superior to thermal bonding properties of the second surface; and an insulation sheet wound around an outermost layer of the wound body, wherein the separator is bonded to the insulation sheet via the first surface thereof. ### Claim 2 (depends on 1) The energy storage device according to claim 1, comprising two of the separators, wherein the separators are bonded together via the first surfaces thereof, and the first surface of one of the separators is bonded to the insulation sheet. ### Claim 3 (depends on 1) The energy storage device according to claim 1, wherein the first surface of the separator is bonded to the insulation sheet in a state in which an end portion of the insulation sheet is sandwiched by the separator. ### Claim 4 (depends on 2) The energy storage device according to claim 2, wherein the first surface of each of the separators is bonded to the insulation sheet in a state in which an end portion of the insulation sheet is sandwiched by the separators. ### Claim 5 (depends on 1) The energy storage device according to claim 1, wherein the insulation sheet is wound at least once around an outer surface of the wound body and bonded to itself in an overlapping area. ### Claim 6 (depends on 1) The energy storage device according to claim 1, wherein the insulation sheet includes a material having thermal bonding properties superior to the thermal bonding properties of the first surface. ### Claim 7 (depends on 1) The energy storage device according to claim 1, wherein the separator comprises two separators, and the two separators are bonded together before the insulation sheet is wound around the wound body. ### Claim 8 (depends on 1) The energy storage device according to claim 1, wherein the separator includes a base material layer and a heat-resistant layer including inorganic particles, the base material layer forms the first surface, and the heat-resistant layer forms the second surface. ### Claim 9 An energy storage device comprising: a wound body including a positive electrode, a negative electrode, and a separator which are layered and wound, the separator being interposed between the positive electrode and the negative electrode and having a first surface and a second surface, the first surface having thermal bonding properties superior to thermal bonding properties of the second surface; and an adhesive tape which fixes an end of an outermost layer of the wound body, wherein an adhesive surface of the adhesive tape and the first surface of the separator are fixed together by contact. ### Claim 10 (depends on 1) A winding apparatus comprising: a winding unit configured to wind a positive electrode, a negative electrode, and a separator having surfaces with different thermal bonding properties in a state in which the positive electrode, the negative electrode, and the separator are layered alternately; and a bonding unit configured to perform the bonding according to claim 1. ### Claim 11 (depends on 1) A winding method comprising: winding a positive electrode, a negative electrode, and a separator having surfaces with different thermal bonding properties in a state in which the positive electrode, the negative electrode, and the separator are layered alternately; and performing the bonding according to claim 1.