# US 2026/0094879 A1 · Method and apparatus for inspecting a pouch battery cell for liquid leakage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0094879 A1 - Document ID: US20260094879A1 - Status: Published application - Kind: A1 - Application number: 19/214,452 - Filed: 2025-05-21 - Published: 2026-04-02 - Earliest claimed: 2024-09-27 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Sac LEE - Web page: https://patentgrep.com/patent/US20260094879A1 ## CPC - H01M 10/4228: {Leak testing of cells or batteries} - H01M 10/4285: {Testing apparatus} - H01M 10/488: {Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density} - H01M 50/105: Pouches or flexible bags - 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 method for inspecting a pouch battery cell for liquid leakage, the method including bringing a first electrolyte reaction sheet into contact with a top surface of the pouch battery cell, visually inspecting a change in a color of the first electrolyte reaction sheet, bringing a second electrolyte reaction sheet into contact with a bottom surface of the pouch battery cell, and visually inspecting a change in a color of the second electrolyte reaction sheet. ## Claims ### Claim 1 A method for inspecting a pouch battery cell for liquid leakage, the method comprising: bringing a first electrolyte reaction sheet into contact with a top surface of the pouch battery cell; visually inspecting a change in a color of the first electrolyte reaction sheet; bringing a second electrolyte reaction sheet into contact with a bottom surface of the pouch battery cell; and visually inspecting a change in a color of the second electrolyte reaction sheet. ### Claim 2 (depends on 1) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 1, wherein bringing the first electrolyte reaction sheet into contact with the top surface of the pouch battery cell comprises: introducing the pouch battery cell below a top surface inspection plate with a bottom surface to which the first electrolyte reaction sheet is attached; bringing the first electrolyte reaction sheet into contact with the top surface of the pouch battery cell by lowering the top surface inspection plate; lifting the top surface inspection plate and rotating the top surface inspection plate by 180°; and inspecting, by a top surface vision inspection section placed above the top surface inspection plate, a change in the color of the first electrolyte reaction sheet. ### Claim 3 (depends on 2) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 2, wherein: the top surface inspection plate is placed above a transport path, and the pouch battery cell is introduced below the top surface inspection plate along the transport path. ### Claim 4 (depends on 3) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 3, wherein bringing a second electrolyte reaction sheet into contact with a bottom surface of the pouch battery cell and visually inspecting a change in a color of the second electrolyte reaction sheet comprises: picking up, by a cell moving section, the pouch battery cell to bring the bottom surface of the pouch battery cell into contact with the second electrolyte reaction sheet placed on a bottom surface inspection plate, the cell moving section returning the pouch battery cell to an original position; and inspecting, by a bottom surface vision inspection section placed above the bottom surface inspection plate, a change in the color of the second electrolyte reaction sheet. ### Claim 5 (depends on 4) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 4, wherein: the pouch battery cell is transported along the transport path, the cell moving section is placed on one side of the transport path, and the bottom surface inspection plate is placed on an opposite side of the transport path. ### Claim 6 (depends on 5) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 5, wherein the picking up comprises: picking up, by the cell moving section, the pouch battery cell with a vacuum grip, the cell moving section moving the pouch battery cell above the bottom surface inspection plate; moving, by the cell moving section, the vacuum grip downward to bring the bottom surface of the pouch battery cell into contact with the second electrolyte reaction sheet attached on the bottom surface inspection plate; moving, by the cell moving section, the vacuum grip to an original position; and placing, by the cell moving section using the vacuum grip, the pouch battery cell on the transport path. ### Claim 7 (depends on 4) The method for inspecting a pouch battery cell for liquid leakage as claimed in claim 4, wherein: bringing the first electrolyte reaction sheet into contact with the top surface of the pouch battery cell and visually inspecting a change in a color of the first electrolyte reaction sheet are simultaneously performed on a plurality of pouch battery cells, and bringing the second electrolyte reaction sheet into contact with the bottom surface of the pouch battery cell and visually inspecting a change in a color of the second electrolyte reaction sheet are simultaneously performed on the plurality of pouch battery cells. ### Claim 8 An apparatus for inspecting a pouch battery cell for liquid leakage, the apparatus comprising: a top surface inspection unit configured to bring a first electrolyte reaction sheet into contact with a top surface of a pouch battery cell and visually inspects a change in a color of the first electrolyte reaction sheet; and a bottom surface inspection unit configured to bring a second electrolyte reaction sheet into contact with a bottom surface of the pouch battery cell and visually inspects a change in a color of the second electrolyte reaction sheet. ### Claim 9 (depends on 8) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 8, wherein the top surface inspection unit comprises: a top surface inspection plate with a bottom surface to which the first electrolyte reaction sheet is attached, the top surface inspection plate being rotatable 180° and being movable up and down; and a top surface vision inspection section is above the top surface inspection plate to visually inspect a change in the color of the first electrolyte reaction sheet. ### Claim 10 (depends on 9) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 9, wherein: the top surface inspection plate is above a transport path, and the pouch battery cell is below the top surface inspection plate along the transport path. ### Claim 11 (depends on 10) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 10, wherein the bottom surface inspection unit comprises: a bottom surface inspection plate with a top surface to which the second electrolyte reaction sheet is attached; a bottom surface vision inspection section is above the bottom surface inspection plate, the bottom surface vision inspection section visually inspecting a change in the color of the second electrolyte reaction sheet; and a cell moving section moving the pouch battery cell to the bottom surface inspection plate to bring the bottom surface of the pouch battery cell into contact with the second electrolyte reaction sheet, the cell moving section returning the pouch battery cell to an original position. ### Claim 12 (depends on 11) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 11, wherein: the pouch battery cell is along the transport path, the cell moving section is on one side of the transport path, and the bottom surface inspection plate is on an opposite side of the transport path. ### Claim 13 (depends on 11) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 11, wherein the cell moving section comprises: a vacuum grip for holding the pouch battery cell; and a mover for moving the vacuum grip over the bottom surface inspection plate. ### Claim 14 (depends on 11) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 11, the apparatus further comprising: a first support on a first side of the transport path to support the top surface vision inspection section; and a second support on a second side of the transport path to support the bottom surface vision inspection section. ### Claim 15 (depends on 11) The apparatus for inspecting a pouch battery cell for liquid leakage as claimed in claim 11, wherein: the top surface inspection unit comprises a plurality of top surface inspection plates and a plurality of top surface vision inspection sections to simultaneously inspect the top surface on a plurality of pouch battery cells, and the bottom surface inspection unit comprises a plurality of bottom surface inspection plates and a plurality of bottom surface vision inspection sections to simultaneously inspect the bottom surface on the plurality of pouch battery cells.