# US 12,224,450 B2 · Power supply device, and electric vehicle and power storage device that comprise said power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,450 B2 - Document ID: US12224450B2 - Status: Granted - Kind: B2 - Application number: 17/619,437 - Filed: 2020-06-15 - Published: 2022-12-01 - Granted: 2025-02-11 - Earliest claimed: 2019-06-28 - Assignees: Sanyo Electric Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Nao Kogami; Hiroyuki Takahashi - Web page: https://patentgrep.com/patent/US12224450B2 ## CPC - H01M 50/242: adapted for protecting batteries against vibrations, collision impact or swelling - H01M 10/625: Vehicles - H01M 10/647: Prismatic or flat cells, e.g. pouch cells - H01M 10/658: by thermal insulation or shielding - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) - H01M 50/264: for cells or batteries, e.g. straps, tie rods or peripheral frames - H01M 50/293: characterised by the material - H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A power supply device includes a battery block in which a plurality of battery cells is stacked in a thickness with separator clamped therebetween, a pair of end plates disposed on opposing end faces of the battery block, and a binding bar coupled to the pair of end plates and fixing the battery block in a compressed state via the end plates, in order to absorb expansion of the battery cells with the separator and suppress degradation of the separator in a state of being heated by the battery cells. Separator has a three-layer structure including viscoelastic elastic sheet that absorbs expansion of battery cell and heat-insulating sheets laminated on opposing surfaces of elastic sheet, and heat-insulating sheet is hybrid material of an inorganic powder and a fibrous reinforcing material. ## Claims ### Claim 1 A power supply device comprising: a battery block including a plurality of battery cells stacked in a thickness with a separator clamped between each adjacent pair of the plurality of battery cells; a pair of end plates disposed on opposing end faces of the battery block; and a binding bar coupled to the pair of end plates to fix the battery block in a compressed state via the end plates, wherein the separator includes a three-layer structure including (i) an elastic sheet that is viscoelastic and absorbs expansion of the adjacent pair of the plurality of battery cells, and (ii) (iii) heat-insulating sheets laminated on opposing surfaces of the elastic sheet, each of the heat-insulating sheets includes a hybrid material of an inorganic powder and a fibrous reinforcing material, and wherein each of the plurality of battery cells includes a battery case whose upper end opening is closed with a sealing plate, and the separator includes the elastic sheet disposed in a body region, the body region not including a sealing part region clamped at an upper end of the battery case between the adjacent pair of the plurality of battery cells. ### Claim 2 (depends on 1) The power supply device according to claim 1, wherein the heat-insulating sheet includes a hybrid material of a silica aerogel and a fibrous reinforcing material. ### Claim 3 (depends on 1) The power supply device according to claim 1, wherein the elastic sheet is at least one selected from a synthetic rubber sheet, a thermoplastic elastomer, or a foam material. ### Claim 4 (depends on 3) The power supply device according to claim 3, wherein the elastic sheet includes synthetic rubber including a heat resistance limit temperature of 100° C. or higher. ### Claim 5 (depends on 3) The power supply device according to claim 3, wherein the elastic sheet includes any of fluororubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, a chloroprene rubber, a nitrile rubber, a hydrogenated nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, ethylene vinyl acetate copolymer rubber, chlorosulfonated polyethylene rubber, acrylic rubber, epichlorohydrin rubber, urethane rubber, silicone rubber, thermoplastic olefin rubber, ethylene propylene diene rubber, butyl rubber, or polyether rubber. ### Claim 6 (depends on 1) The power supply device according to claim 1, wherein the elastic sheet has a thickness between 0.2 mm and 2.0, inclusive. ### Claim 7 (depends on 1) The power supply device according to claim 1, wherein the heat-insulating sheet is thicker than the elastic sheet. ### Claim 8 (depends on 1) The power supply device according to claim 1, wherein the separator has a thickness between 1 mm and 3 mm, inclusive. ### Claim 9 (depends on 1) An electric vehicle including the power supply device according to claim 1, the electric vehicle comprising: the power supply device; a motor for travelling that receives electric power from the power supply device; a vehicle body that incorporates the power supply device and the motor; and a wheel that is driven by the motor to cause the vehicle body travel. ### Claim 10 (depends on 1) A power storage device including the power supply device according to claim 1, the power storage device comprising: the power supply device; and a power supply controller configured to control charging and discharging of the power supply device, wherein the power supply controller enables charging of the plurality of battery cells with electric power supplied from an outside and causes the plurality of battery cells to charge.