# US 12,191,438 B2 · Method for producing a 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 12,191,438 B2 - Document ID: US12191438B2 - Status: Granted - Kind: B2 - Application number: 18/063,688 - Filed: 2022-12-09 - Published: 2023-09-28 - Granted: 2025-01-07 - Earliest claimed: 2022-03-23 - Assignees: Prime Planet Energy & Solutions, Inc. - Applicants: Prime Planet Energy & Solutions, Inc. - Inventors: Tomonori Maeda - Web page: https://patentgrep.com/patent/US12191438B2 ## CPC - H01M 10/0481: {Compression means other than compression means for stacks of electrodes and separators} - H01M 50/183: Sealing members - 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 method for producing a power storage device includes: compressively deforming in which case long-side walls of the power storage device after initial charging and aging but before permanent sealing are pressed toward an electrode body to compress the electrode body and further plastically deform at least one of the case long-side walls so that the case long-side walls continue to press the electrode body even after the pressing is released; after this compressively deforming, hermetically permanently sealing the case of the power storage device in which the inside of the case is in communication with the outside; and releasing the pressing applied in the compressively deforming. ## Claims ### Claim 1 A method for producing a power storage device, the power storage device comprising: an electrode body having a pair of electrode body flat surfaces and including a plurality of electrode sheets laminated in a thickness direction perpendicular to an extending direction of the flat surfaces; an electrolytic solution; a case that has a pair of case side walls each facing one of the electrode flat surfaces and accommodates the electrode body and the electrolytic solution, wherein the method comprises: (a) compressively deforming including pressing the pair of case side walls of the case against the electrode body after the power storage device is subjected to initial charging and aging but before permanent sealing, to: compress the electrode body interposed between the pair of case side walls in the thickness direction; and plastically deform at least one of the pair of case side walls to be recessed toward the electrode body so that the pair of case side walls continue to press the electrode body in the thickness direction even after releasing the pressing; after the compressively deforming, (b) hermetically permanently sealing the case of the power storage device in which inside of the case is in communication with outside; and (c) releasing the pressing on the power storage device applied in the compressively deforming. ### Claim 2 (depends on 1) The method for producing a power storage device according to claim 1, wherein the electrode sheets of the electrode body include: a positive electrode sheet including a positive active material layer containing positive active material particles; and a negative electrode sheet, and the positive active material particles are lithium transition metal composite oxide particles having a composition in which Ni is contained at a ratio of 50% or more to the total amount of transition metals excluding Li. ### Claim 3 (depends on 1) The method for producing a power storage device according to claim 1, wherein the compressively deforming is performed on the power storage device with the inside of the case is in communication with the outside. ### Claim 4 (depends on 3) The method for producing a power storage device according to claim 3, wherein the electrode sheets of the electrode body include: a positive electrode sheet including a positive active material layer containing positive active material particles; and a negative electrode sheet, and the positive active material particles are lithium transition metal composite oxide particles having a composition in which Ni is contained at a ratio of 50% or more to the total amount of transition metals excluding Li. ### Claim 5 (depends on 1) The method for producing a power storage device according to claim 1, wherein the electrode body has properties that a dimension in the thickness direction increases as an SOC becomes higher, and the compressively deforming is performed on the power storage device adjusted to 30% SOC or less. ### Claim 6 (depends on 5) The method for producing a power storage device according to claim 5, wherein the electrode sheets of the electrode body include: a positive electrode sheet including a positive active material layer containing positive active material particles; and a negative electrode sheet, and the positive active material particles are lithium transition metal composite oxide particles having a composition in which Ni is contained at a ratio of 50% or more to the total amount of transition metals excluding Li. ### Claim 7 (depends on 5) The method for producing a power storage device according to claim 5, wherein the compressively deforming is performed on the power storage device with the inside of the case is in communication with the outside. ### Claim 8 (depends on 7) The method for producing a power storage device according to claim 7, wherein the electrode sheets of the electrode body include: a positive electrode sheet including a positive active material layer containing positive active material particles; and a negative electrode sheet, and the positive active material particles are lithium transition metal composite oxide particles having a composition in which Ni is contained at a ratio of 50% or more to the total amount of transition metals excluding Li.