# US 12,191,514 B2 · Power supply device and electric vehicle and power storage device using same, fastening member for power supply device, production method for power supply device, and production method for fastening member for 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 12,191,514 B2 - Document ID: US12191514B2 - Status: Granted - Kind: B2 - Application number: 17/441,328 - Filed: 2019-12-24 - Published: 2022-06-16 - Granted: 2025-01-07 - Earliest claimed: 2019-03-29 - Assignees: Sanyo Electric Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Go Yamashiro - Web page: https://patentgrep.com/patent/US12191514B2 ## CPC - B60K 1/04: of the electric storage means for propulsion - 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 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/224: Metals - H01M 50/236: Hardness - H01M 50/238: Flexibility or foldability - H01M 50/242: adapted for protecting batteries against vibrations, collision impact or swelling - H01M 50/244: Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method - H01M 50/262: with fastening means, e.g. locks - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - 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 The power supply device includes: a plurality of secondary battery cells each including a prismatic exterior can; a pair of end plates covering both end surfaces of a battery stack body in which the plurality of secondary battery cells are stacked; and a plurality of fastening members made of metal each having a plate shape extending in a stack direction of the plurality of secondary battery cells and disposed on an opposing side surface of the battery stack body to fasten the end plates to each other, in which each of the plurality of fastening members includes fastening portion fixed to the end plate at each of both ends in a longer direction, and intermediate portion coupling fastening portions with each other, and fastening portions is higher in strength than intermediate portion, and intermediate portion is higher in stretchability than fastening portions. ## Claims ### Claim 1 A power supply device comprising: a plurality of secondary battery cells each including a prismatic exterior can; a pair of end plates covering both end surfaces of a battery stack body in which the plurality of secondary battery cells are stacked; and a plurality of fastening members each containing metal and including a plate shape extending in a stack direction of the plurality of secondary battery cells, the plurality of fastening members being disposed on opposing side surfaces of the battery stack body to fasten the end plates to each other, wherein each of the plurality of fastening members includes fastening portions each including a first metal, the fastening portions each being fixed to a corresponding one of the end plates at both ends in a longer direction of the fastening member, and an intermediate portion including a second metal different from the first metal, the intermediate portion coupling the fastening portions with each other, the first metal is higher in strength than the second metal, and the second metal is higher in stretchability than the first metal. ### Claim 2 (depends on 1) The power supply device according to claim 1, wherein the fastening member joins a joint interface between each of the fastening portions and the intermediate portion by friction stir welding. ### Claim 3 (depends on 1) The power supply device according to claim 1, wherein the first metal includes an iron-based metal, and the second metal includes an aluminum-based metal. ### Claim 4 (depends on 1) The power supply device according to claim 1, wherein the fastening portions and the intermediate portion are configured to be same in thickness. ### Claim 5 (depends on 1) The power supply device according to claim 1, wherein each of the fastening members further includes a locking block fixed to each of the fastening portions, each of the end plates includes a step part for locking the locking block in a state of being fastened by the fastening member, and the locking block and a corresponding one of the fastening portions are fixed by welding. ### Claim 6 (depends on 5) The power supply device according to claim 5, wherein the locking block includes the first metal. ### Claim 7 (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 to which electric power is supplied from the power source device; a vehicle body on which the power supply device and the motor are mounted; and a wheel driven by the motor to cause the vehicle body to travel. ### Claim 8 (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 that controls charging and discharging of the power supply device, wherein the power supply controller enables charging of the secondary battery cells by external electric power and causes the secondary battery cell to charge. ### Claim 9 A fastening member for a power supply device for fastening a pair of end plates covering both end surfaces of a battery stack body in which a plurality of secondary battery cells each including a prismatic exterior can are stacked, the fastening member comprising: fastening portions including a first metal, the fastening portions being fixed to each of the end plates at each of both ends in a longer direction; and an intermediate portion including a second metal different from the first metal, the intermediate portion coupling the fastening portions with each other, wherein the first metal is higher in strength than the second metal, and the second metal is higher in stretchability than the first metal. ### Claim 10 A production method for a fastening member for a power supply device for fastening a pair of end plates covering both end surfaces of a battery stack body in which a plurality of secondary battery cells each including a prismatic exterior can are stacked, the production method comprising the steps of: preparing a fastening portion and an intermediate portion, the fastening portions including a first metal, the fastening portions being fixed to each of the end plates at each of both ends in a longer direction, the intermediate portion including a second metal different from the first metal, the intermediate portion coupling the fastening portions with each other, the first metal being higher in strength than the second metal, the second metal being higher in stretchability than the first metal; and welding, by friction stir welding, the fastening portions and the intermediate portion. ### Claim 11 A production method for a power supply device, the power supply device including a plurality of secondary battery cells each including a prismatic exterior can, a pair of end plates covering both end surfaces of a battery stack body in which the plurality of secondary battery cells are stacked, and a plurality of fastening members each containing metal and including a plate shape extending in a stack direction of the plurality of secondary battery cells, the plurality of fastening members being disposed on opposing side surfaces of the battery stack body to fasten the end plates to each other, the production method comprising: welding, by friction stir welding, a fastening portion and an intermediate portion, the fastening portions including a first metal, the fastening portions being fixed to each of the end plate at each of both ends in a longer direction, the intermediate portion including a second metal different from the first metal, the intermediate portion coupling the fastening portions with each other, the first metal being higher in strength than the second metal, the second metal being higher in stretchability than the first metal; and covering both end surfaces of the battery stack body with the pair of the end plates and fastening the end plates to each other with a fastening member for a power supply device.