# US 12,603,366 B2 · Battery cell and battery module including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,366 B2 - Document ID: US12603366B2 - Status: Granted - Kind: B2 - Application number: 17/802,425 - Filed: 2021-11-02 - Published: 2023-03-16 - Granted: 2026-04-14 - Earliest claimed: 2020-11-06 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Hun-Hee Lim; Sang-Hun Kim; Hyung-Kyun Yu; Min-Hyeong Kang - Web page: https://patentgrep.com/patent/US12603366B2 ## CPC - H01M 50/105: Pouches or flexible bags - H01M 50/172: Arrangements of electric connectors penetrating the casing - H01M 50/1243: {characterised by the internal coating on the casing} - H01M 50/178: for pouch or flexible bag cells - H01M 50/184: characterised by their shape or structure - H01M 50/193: Organic material - H01M 50/30: Arrangements for facilitating escape of gases - H01M 50/367: Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems - H01M 50/394: {Gas-pervious parts or elements} - H01M 50/557: Plate-shaped terminals - H01M 50/188: the sealing members being arranged between the lid and terminal - 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 Disclosed is a battery cell, which includes a battery case having an accommodation portion in which a battery assembly is positioned, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the battery assembly, the electrode lead protruding out of the battery case through the sealing portion; and a lead film positioned adjacent to the sealing portion on at least one of a first side and a second side of the electrode lead, wherein the lead film includes a gas discharge portion formed to extend from an inside of the battery case to an outside of the battery case, and the gas discharge portion is opened on a side disposed inside of the battery case. ## Claims ### Claim 1 A battery cell, comprising: a battery case having an accommodation portion in which a battery assembly is positioned, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the battery assembly, the electrode lead protruding out of the battery case through the sealing portion; and a lead film positioned adjacent to the sealing portion on at least one of a first side and a second side of the electrode lead, wherein the lead film includes a gas discharge portion formed to extend from an inside of the battery case to an outside of the battery case, wherein the gas discharge portion is opened on a side disposed inside of the battery case, and wherein a first end surface of the gas discharge portion is closed and discharges gas therethrough to an outside of the battery cell while closed. ### Claim 2 (depends on 1) The battery cell according to claim 1, wherein opposing side surfaces of the lead film forming the gas discharge portion are closed and configured to discharge gas therethrough to the outside of the battery cell while closed. ### Claim 3 (depends on 2) The battery cell according to claim 2, further comprising: an inner layer configured to cover at least a part of a surface of the gas discharge portion. ### Claim 4 (depends on 3) The battery cell according to claim 3, wherein a material of the inner layer has a higher melting point compared to a material of the lead film, and the material of the inner layer does not react with an electrolytic solution. ### Claim 5 (depends on 4) The battery cell according to claim 4, wherein the lead film contains a polyolefin-based material, and the inner layer contains at least one of polyolefin-based, fluorine-based and porous ceramic-based materials. ### Claim 6 (depends on 2) The battery cell according to claim 2, wherein the first end surface and the opposing side surfaces are disposed on the outside of the battery case. ### Claim 7 (depends on 1) The battery cell according to claim 1, wherein the lead film has a greater width than the electrode lead. ### Claim 8 (depends on 7) The battery cell according to claim 7, wherein the lead film has a greater length than the sealing portion, and the lead film has a smaller length than the electrode lead. ### Claim 9 (depends on 7) The battery cell according to claim 7, wherein the gas discharge portion has a greater width than the electrode lead. ### Claim 10 (depends on 1) The battery cell according to claim 1, wherein the lead film includes a first lead film and a second lead film, the first lead film is positioned on a first side of the electrode lead, and the second lead film is positioned on a second side of the electrode lead. ### Claim 11 (depends on 10) The battery cell according to claim 10, wherein the electrode lead is positioned between the first lead film and the second lead film, and the first lead film and the second lead film are connected to each other. ### Claim 12 (depends on 1) The battery cell according to claim 1, wherein an end of the gas discharge portion formed within the lead film is positioned further outward than an outer surface of the battery case. ### Claim 13 (depends on 12) The battery cell according to claim 12, wherein an end of the gas discharge portion opened toward the inside of the battery case is positioned further inward than an inner surface of the battery case. ### Claim 14 (depends on 1) A battery module, comprising the battery cell according to claim 1. ### Claim 15 (depends on 1) The battery cell according to claim 1, wherein the lead film is configured to permit the gas to permeate therethrough to expel the gas from the gas discharge portion to the outside of the battery cell.