# US 2010/0167115 A1 · Battery system with battery cells held in a stack by metal bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0167115 A1 - Document ID: US20100167115A1 - Status: Published application - Kind: A1 - Application number: 12/639,387 - Filed: 2009-12-16 - Published: 2010-07-01 - Earliest claimed: 2008-12-27 - Assignees: Sanyo Electric Co., Ltd. - Inventors: Wataru OKADA; Shinsuke Nakamura; Tomoyuki Ohmura; Akinobu Wakabayashi - Web page: https://patentgrep.com/patent/US20100167115A1 ## CPC - H01M 50/317: Re-sealable arrangements - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/233: characterised by physical properties of casings or racks, e.g. dimensions - H01M 50/24: adapted for protecting batteries from their environment, e.g. from corrosion (thermal insulation H01M10/658) - H01M 50/264: for cells or batteries, e.g. straps, tie rods or peripheral frames - H01M 50/291: characterised by their shape - H01M 50/293: characterised by the material - 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 - 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 battery system has a battery block 2 with a plurality of battery cells 1 that are rectangular batteries stacked with intervening insulating separators 15, and that battery block 2 is held by fastening components 3. The fastening components 3 are provided with a pair of endplates 4 disposed at the ends of the stacked battery cells 1, and metal bands 5 on both sides of the battery block 2 connected at both ends to the endplates 4. An insulating separator 15 has an insulating plate section 15X, which intervenes between adjacent battery cells 1, and insulating walls 15C, which cover both battery cell 1 side-walls, formed from plastic as a single-piece. In this battery system, insulating plate sections 15X are sandwiched between battery cells 1, and the insulating walls 15C are disposed between battery cell outer side-walls and metal bands to insulate the battery cells from the metal bands. ## Claims ### Claim 1 A battery system comprising: a battery block having a plurality of stacked battery cells that are rectangular batteries; insulating separators made of plastic and sandwiched between the battery cells that make up the battery block to insulate the series-connected battery cells; and fastening components that hold the battery cells of the battery block; wherein the fastening components comprise: a pair of endplates disposed at the ends of the stacked battery cells; and metal bands disposed at battery block side-walls extending in the stacking direction of the battery cells and connected at both ends to the endplates to hold the battery cells in a stack; wherein an insulating separator comprises: an insulating plate section that intervenes between adjacent battery cells; and insulating walls connected to the insulating plate section that cover both battery cell side-walls and are disposed between the battery cell outer side-walls and the metal bands; wherein the insulating walls and the insulating plate section are formed from insulating plastic as a single-piece; and wherein insulating plate sections are sandwiched between battery cells, and the insulating walls are disposed between battery cell outer side-walls and metal bands to insulate the battery cells from the metal bands. ### Claim 2 (depends on 1) The battery system as cited in claim 1 wherein an insulating separator has insulating walls connected to the edges on both sides of the insulating plate section and is formed as a single-piece; and battery cells are fit between the insulating walls on both sides of the insulating separator. ### Claim 3 (depends on 2) The battery system as cited in claim 2 wherein an insulating separator has insulating walls connected to upper and lower ends of the edges on both sides of the insulating plate section and is formed as a single-piece. ### Claim 4 (depends on 3) The battery system as cited in claim 3 wherein an insulating separator has insulating walls connected to upper and lower ends of the edges on both sides of the insulating plate section and is formed as a single-piece; upper and lower insulating walls connect to vertical sections that cover battery cell outer side-walls, to horizontal sections that cover battery cell upper and lower surfaces, and are formed as a single-piece with the insulating separator; and battery cells are fit inside the vertical sections and horizontal sections. ### Claim 5 (depends on 4) The battery system as cited in claim 4 wherein the vertical length (L) of the vertical sections is greater than or equal to the width (W) of the metal bands. ### Claim 6 (depends on 4) The battery system as cited in claim 4 wherein the thickness of the vertical sections of an insulating separator is less than 0.5 mm. ### Claim 7 (depends on 4) The battery system as cited in claim 4 wherein the thickness of the insulating walls of an insulating separator is 0.5 mm to 2 mm. ### Claim 8 (depends on 1) The battery system as cited in claim 1 wherein insulating walls projecting from both surfaces of the insulating plate section of an insulating separator have widths that project to half the battery cell width, and the battery cells are insulated from the metal bands without exposing battery cell outer side-walls. ### Claim 9 (depends on 1) The battery system as cited in claim 1 wherein an insulating separator has insulating walls that project from both planar surfaces of the insulating plate section and is formed as a single-piece. ### Claim 10 (depends on 1) The battery system as cited in claim 1 wherein air passage-way slits are established between the insulating walls provided on adjacently stacked insulating separators. ### Claim 11 (depends on 1) The battery system as cited in claim 1 wherein the insulating separators insulate the external cases of adjacent battery cells, and establish cooling gaps between the battery cells to cool the battery cells. ### Claim 12 (depends on 1) The battery system as cited in claim 1 wherein the endplates are made of metal. ### Claim 13 (depends on 1) The battery system as cited in claim 1 wherein the endplates are fabricated by molding hard plastic. ### Claim 14 (depends on 1) The battery system as cited in claim 1 wherein the endplates are provided with reinforcing ribs on their outside surfaces. ### Claim 15 (depends on 1) The battery system as cited in claim 1 wherein the endplate outline is the same rectangular shape as the rectangular batteries of the battery cells. ### Claim 16 (depends on 1) The battery system as cited in claim 1 wherein the endplates are provided with grooves in surfaces opposite the battery cells to establish cooling gaps between the endplates and the battery cells. ### Claim 17 (depends on 1) The battery system as cited in claim 1 wherein the metal bands are connected to the endplates with their end sections folded inwards. ### Claim 18 (depends on 17) The battery system as cited in claim 17 wherein the endplates are provided with screw-holes on both sides of the outer surfaces of the endplates. ### Claim 19 (depends on 1) The battery system as cited in claim 1 wherein the battery cells are lithium ion batteries. ### Claim 20 (depends on 1) The battery system as cited in claim 1 that is a power source apparatus installed on-board an electric vehicle that supplies electric power to a driving motor to drive the vehicle.