# US 2017/0250388 A1 · Prismatic secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0250388 A1 - Document ID: US20170250388A1 - Status: Published application - Kind: A1 - Application number: 15/504,196 - Filed: 2015-05-21 - Published: 2017-08-31 - Earliest claimed: 2014-09-03 - Assignees: Hitachi Automotive Systems, Ltd. - Applicants: Hitachi Automotive Systems, Ltd. - Inventors: Akira UNNO; Hayato KOGUCHI; Hiroaki EGAWA - Web page: https://patentgrep.com/patent/US20170250388A1 ## CPC - H01M 50/394: {Gas-pervious parts or elements} - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/124: having a layered structure - H01M 50/1245: {characterised by the external coating on the casing} - H01M 50/141: for protecting against humidity - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - 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 ## Abstract An object of the invention is to obtain a rectangular secondary battery in which an outer surface of the battery has an insulating property and watertightness, and a short-circuit due to dew condensation water or the like does not occur between battery containers of adjacent batteries or between a battery container and a housing of a battery pack. A rectangular secondary battery (90) of the present invention for solving the foregoing problems is a rectangular secondary battery in which six faces of a battery container are covered with one sheet of insulating film (50). The rectangular secondary battery (90) is characterized in that, ends of the insulating film are overlapped with each other, and the insulating film continuously covers mutually adjacent faces having each of ridges between the faces of the battery container. ## Claims ### Claim 1 A rectangular secondary battery in which six faces of a battery container are covered with one sheet of insulating film, wherein ends of the insulating film are overlapped with each other, and the insulating film continuously covers mutually adjacent faces having each of ridges therebetween of the battery container. ### Claim 2 (depends on 1) The rectangular secondary battery according to claim 1, wherein the insulating film covers eight corner portions where three ridges of the battery container cross, and continuously covers adjacent faces having each of the three ridges therebetween. ### Claim 3 (depends on 1) The rectangular secondary battery according to claim 1, wherein the insulating film has an adhesive layer on a surface facing the battery container. ### Claim 4 (depends on 1) The rectangular secondary battery according to claim 1, wherein a material of the insulating film includes any of polypropylene, polyethylene, polyethylene terephthalate, polycarbonate, polybutylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyacrylonitrile. ### Claim 5 (depends on 1) The rectangular secondary battery according to claim 1, wherein ends of the insulating film are heat-welded to each other. ### Claim 6 (depends on 1) The rectangular secondary battery according to claim 1, wherein the battery container has a battery can and a battery lid, the battery can having a rectangular bottom surface, a pair of wide-side surfaces rising from a pair of long sides of the bottom surface, and a pair of narrow-side surfaces rising from a pair of short sides of the bottom surface, the battery lid blocking an opening part of the battery can and being provided with external terminals, the insulating film has bottom surface opposing parts facing a bottom surface of the battery can, a pair of wide-side-surface opposing parts facing the pair of wide-side surfaces, a pair of narrow-side-surface opposing parts facing the narrow-side surfaces of the battery can, and a battery lid opposing part facing the battery lid and being provided with an opening part for exposing the external terminals, and the parts of the insulating film are respectively overlapped with each other on three faces of the battery container. ### Claim 7 (depends on 6) The rectangular secondary battery according to claim 6, wherein the bottom surface opposing parts of the insulating film are overlapped with each other on the bottom surface of the battery can, and the narrow-side-surface opposing parts of the insulating film are respectively overlapped with each other on the pair of the narrow-side surfaces of the battery can. ### Claim 8 (depends on 6) The rectangular secondary battery according to claim 6, wherein the battery lid opposing parts of the insulating film are overlapped with each other on the battery lid of the battery container, and the pair of the narrow-side-surface opposing parts of the insulating film are respectively overlapped with each other on the pair of the narrow-side surfaces of the battery container. ### Claim 9 (depends on 6) The rectangular secondary battery according to claim 6, wherein one side of the narrow-side-surface opposing parts of the insulating film are overlapped with each other on one side of the narrow-side surfaces of the battery can, the bottom surface opposing parts of the insulating film are overlapped with each other on the bottom surface of the battery can, and the battery lid opposing parts of the insulating film are overlapped with each other on the battery lid of the battery container. ### Claim 10 (depends on 6) The rectangular secondary battery according to claim 6, wherein the wide-side-surface opposing parts of the insulating film are overlapped with each other on one side of wide-side surfaces of the battery can, and the pair of the narrow-side-surface opposing parts of the insulating film are respectively overlapped with each other on the pair of narrow-side surfaces of the battery can. ### Claim 11 (depends on 6) The rectangular secondary battery according to any one of claim 6, wherein the rectangular secondary battery has an insulating protective film for covering an outer surface of the battery container exposed from the opening part of the insulating film. ### Claim 12 (depends on 6) The rectangular secondary battery according to any one of claim 6, wherein the battery lid is provided with a gas discharge valve, and the insulating film has an opening part for discharging gas at a portion corresponding to the gas discharge valve.