# US 12,009,538 B2 · Battery system, vehicle including battery system, and power storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,538 B2 - Document ID: US12009538B2 - Status: Granted - Kind: B2 - Application number: 17/266,159 - Filed: 2019-07-26 - Published: 2021-10-07 - Granted: 2024-06-11 - Earliest claimed: 2018-09-14 - Assignees: Sanyo Electric Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Koji Fujinaga; Kengo Ishibashi; Shinichi Mitsubori - Web page: https://patentgrep.com/patent/US12009538B2 ## CPC - H01M 50/233: characterised by physical properties of casings or racks, e.g. dimensions - 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 2220/10: Batteries in stationary systems, e.g. emergency power source in plant - 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 battery system includes: a battery stack including a plurality of rectangular battery cells that are stacked; end plate placed at both ends of the battery stack; and a binding bar that connects the end plates to fix the battery stack in a compressed state. End plate includes plates placed on both surfaces and plate-shaped block laminated between plates; plates include outer plate and inner plate; plate-shaped block includes dual-side blocks placed on both sides so as to be separated from each other and intermediate block placed in tapered groove between dual-side blocks; the tapered groove has a taper shape that gradually increases in width from an outside to an inside of the end plate. The intermediate block is placed in facing surfaces of the tapered groove in a slidable manner; the dual-side blocks are fixed to the plates; and intermediate block pressed by battery stack is press-fitted into tapered groove and end plate applies tensile stress to outer plate and inner plate via dual-side blocks. ## Claims ### Claim 1 A battery system comprising: a battery stack including a plurality of rectangular battery cells that are stacked; a pair of end plates placed at both ends of the battery stack; and a binding bar that connects the pair of end plates together to fix the battery stack in a compressed state in a stacking direction, each of the end plates including plates placed on both surfaces of the end plate, and a plate-shaped block laminated between the plates, wherein the plates each include an outer plate placed on an outer surface among the both surfaces and an inner plate placed on an inner surface among the both surfaces, the plate-shaped block includes dual-side blocks placed on both sides and separated from each other, and an intermediate block provided in a tapered groove between the dual-side blocks, the tapered groove has a taper shape that gradually increases in width from an outside to an inside of the end plate, the intermediate block is placed in close contact with facing surfaces of the tapered groove in a slidable manner, the dual-side blocks are fixed on inner surfaces of the plates, and the intermediate block pressed by the battery stack is press-fitted into the tapered groove and applies tensile stress to the outer plate and the inner plate via the dual-side blocks. ### Claim 2 (depends on 1) The battery system according to claim 1, wherein the battery system has a gap between an inner surface of the outer plate and the intermediate block. ### Claim 3 (depends on 1) The battery system according to claim 1, wherein the tapered groove has an inclination angle α of 5 degrees or more. ### Claim 4 (depends on 1) The battery system according to claim 1, wherein the tapered groove has an inclination angle α of 45 degrees or less. ### Claim 5 (depends on 1) The battery system according to claim 1, wherein the plate-shaped block is thicker than each of the plates. ### Claim 6 (depends on 1) The battery system according to claim 1, wherein the plates and the dual-side blocks are made of metal, and the plates and the dual-side blocks are fixed by welding. ### Claim 7 (depends on 1) The battery system according to claim 1, wherein the binding bar is fixed to the plate-shaped block. ### Claim 8 (depends on 1) The battery system according to claim 1, wherein the dual-side blocks are provided with fixing holes penetrating in a vertical direction. ### Claim 9 (depends on 1) The battery system according to claim 1, wherein an opening width W of the tapered groove on a side of the inner plate is 30% or more of a total width H of each of the end plates. ### Claim 10 (depends on 1) The battery system according to claim 1, wherein each of the rectangular battery cells is a non-aqueous electrolyte secondary battery. ### Claim 11 (depends on 1) A vehicle equipped with the battery system according to claim 1, the vehicle comprising: said battery system including: the battery system; a motor for traveling supplied with electric power from the battery system; a vehicle body equipped with the battery system and the motor; and a wheel driven by the motor to cause the vehicle body to travel. ### Claim 12 (depends on 1) A power storage device equipped with the battery system according to claim 1, the power storage device comprising: the battery system; a power supply controller that controls charging and discharging of the battery system, wherein the battery system enables charging of any of the plurality of rectangular battery cells power from an outside by the power supply controller, and causes charging of the plurality of rectangular battery cells.