# US 12,603,392 B2 · Square secondary battery and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,392 B2 - Document ID: US12603392B2 - Status: Granted - Kind: B2 - Application number: 18/002,365 - Filed: 2021-09-28 - Published: 2023-12-21 - Granted: 2026-04-14 - Earliest claimed: 2021-03-08 - Assignees: Vehicle Energy Japan Inc. - Applicants: Vehicle Energy Japan Inc. - Inventors: Nobuyoshi Tanaka - Web page: https://patentgrep.com/patent/US12603392B2 ## CPC - H01M 50/477: characterised by their shape - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/474: characterised by their position inside the cells - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 50/591: Covers - H01M 50/593: Spacers; Insulating plates - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - 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 A square secondary battery, including: a conductive container which is formed in a rectangular parallelepiped shape opened on one surface side; a lid which seals the one surface side of the container; a charge/discharge body which is housed in the container and which has electrodes respectively formed on both sides in a width direction; and an insulating member which coats the charge/discharge body and which insulates the charge/discharge body and the container from each other, wherein the insulating member is formed in a rectangular parallelepiped shape opened on one surface side and at least one side surface among a pair of side surfaces respectively opposing the electrodes of the charge/discharge body is folded in a direction of separation from the charge/discharge body along a height direction. ## Claims ### Claim 1 A square secondary battery, comprising: a conductive container which is formed in a rectangular parallelepiped shape opened on one surface side; a lid which seals the one surface side of the container; a charge/discharge body which is housed in the container and which has electrodes respectively formed on both sides in a width direction; and an insulating member which coats the charge/discharge body and which insulates the charge/discharge body and the container from each other, wherein the insulating member is formed in a rectangular parallelepiped shape opened on one surface side and at least one side surface among a pair of narrow-width side surfaces respectively opposing the electrodes of the charge/discharge body is folded in a direction of separation from the charge/discharge body along a height direction, wherein the insulating member is formed by folding an insulation sheet formed of an insulation member, and on at least one side surface among the narrow-width side surfaces respectively opposing the electrodes of the charge/discharge body in the insulation sheet, a crease for folding the narrow-width side surface in a direction of separation from the charge/discharge body is formed in a direction from the one open surface toward the bottom surface. ### Claim 2 (depends on 1) The square secondary battery according to claim 1, wherein in the insulating member, an inclined surface which is inclined toward a boundary with the bottom surface is formed at an end section on the side of the bottom surface in the side surface which is folded in a direction of separation from the charge/discharge body among the pair of side surfaces respectively opposing the electrodes of the charge/discharge body. ### Claim 3 A manufacturing method of a square secondary battery, the square secondary battery including: a conductive container which is formed in a rectangular parallelepiped shape opened on one surface side; a lid which seals the one surface side of the container; a charge/discharge body which is housed in the container and which has electrodes respectively formed on both sides in a width direction; and an insulating member which coats the charge/discharge body and which insulates the charge/discharge body and the container from each other, the insulating member being formed in a rectangular parallelepiped shape opened on one surface side by folding an insulation sheet formed of an insulation material, and at least one side surface among a pair of narrow-width side surfaces respectively opposing the electrodes of the charge/discharge body being folded in a direction of separation from the charge/discharge body along a height direction, and formed by folding an insulation sheet formed of an insulation member, and on at least one side surface among the narrow-width side surfaces respectively opposing the electrodes of the charge/discharge body in the insulation sheet, a crease for folding the narrow-width side surface in a direction of separation from the charge/discharge body is formed in a direction from the one open surface toward the bottom surface, and the manufacturing method of a square secondary battery comprising: a first step of creating the insulation sheet; a second step of forming the insulating member by folding the insulation sheet; and a third step of housing the charge/discharge body so as to insert the charge/discharge body into the insulating member from the open one surface side of the insulating member. ### Claim 4 (depends on 3) The manufacturing method of a square secondary battery according to claim 3, further comprising: a fourth step of housing the charge/discharge body being housed in the insulating member in the container so as to insert the charge/discharge body from the open one surface side of the container. ### Claim 5 (depends on 3) The manufacturing method of a square secondary battery according to claim 3, wherein in the second step, an inclined surface which is inclined toward a boundary with the bottom surface is formed at an end section on the side of the bottom surface of the side surface which is folded in a direction of separation from the charge/discharge body among the pair of side surfaces respectively opposing the electrodes of the charge/discharge body in the insulating member. ### Claim 6 A manufacturing method of a square secondary battery, the square secondary battery including: a conductive container which is formed in a rectangular parallelepiped shape opened on one surface side; a lid which seals the one surface side of the container; a charge/discharge body which is housed in the container and which has electrodes respectively formed on both sides in a width direction; and an insulating member which coats the charge/discharge body and which insulates the charge/discharge body and the container from each other, the insulating member being formed in a rectangular parallelepiped shape opened on one surface side by folding an insulation sheet formed of an insulation material, and at least one side surface among a pair of narrow-width side surfaces respectively opposing the electrodes of the charge/discharge body being folded in a direction of separation from the charge/discharge body along a height direction, and formed by folding an insulation sheet formed of an insulation member, and on at least one narrow-width side surface among the side surfaces respectively opposing the electrodes of the charge/discharge body in the insulation sheet, a crease for folding the narrow-width side surface in a direction of separation from the charge/discharge body is formed in a direction from the one open surface toward the bottom surface, and the manufacturing method of a square secondary battery comprising: a first step of creating the insulation sheet; and a second step of forming the insulating member by folding the insulation sheet so as to coat the charge/discharge body. ### Claim 7 (depends on 6) The manufacturing method of a square secondary battery according to claim 6, further comprising: a third step of housing the charge/discharge body being coated by the insulating member made of the insulation sheet in the container so as to insert the charge/discharge body from the open one surface side of the container. ### Claim 8 (depends on 6) The manufacturing method of a square secondary battery according to claim 6, wherein in the second step, an inclined surface which is inclined toward a boundary with the bottom surface is formed at an end section on the side of the bottom surface of the side surface which is folded in a direction of separation from the charge/discharge body among the pair of side surfaces respectively opposing the electrodes of the charge/discharge body in the insulating member. ### Claim 9 (depends on 1) The square secondary battery according to claim 1, wherein in the insulating member, an inclined surface which is inclined toward a boundary with the bottom surface is formed at an end section on the side of the bottom surface in the side surface which is folded in a direction of separation from the charge/discharge body among the pair of side surfaces respectively opposing the electrodes of the charge/discharge body. ### Claim 10 (depends on 4) The manufacturing method of a square secondary battery according to claim 4, wherein in the first step, on at least one side surface among the side surfaces respectively opposing the electrodes of the charge/discharge body in the insulation sheet, a crease for folding the side surface in a direction of separation from the charge/discharge body is formed in a direction from the one open surface toward the bottom surface. ### Claim 11 (depends on 7) The manufacturing method of a square secondary battery according to claim 7, wherein in the first step, on at least one side surface among the side surfaces respectively opposing the electrodes of the charge/discharge body in the insulation sheet, a crease for folding the side surface in a direction of separation from the charge/discharge body is formed in a direction from the one open surface toward the bottom surface.