# US 2026/0066441 A1 · 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 2026/0066441 A1 - Document ID: US20260066441A1 - Status: Published application - Kind: A1 - Application number: 19/024,902 - Filed: 2025-01-16 - Published: 2026-03-05 - Earliest claimed: 2024-09-02 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: YEONGYEONG CHOI - Web page: https://patentgrep.com/patent/US20260066441A1 ## CPC - H01M 50/325: comprising deformable valve members, e.g. elastic or flexible valve members - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 50/367: Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems - 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 battery cell includes an electrode assembly comprising a positive electrode and a negative electrode, a case accommodating the electrode assembly, the case having an open portion in one surface thereof, a cap plate part covering the open portion, the cap plate part being coupled to the case, a vent part on the cap plate part, the vent part having a gas flow path depending on an internal pressure of the case, and an opening/closing part on one surface of the case and facing the vent part, the opening/closing part configured to open and close the gas flow path. ## Claims ### Claim 1 A battery cell, comprising: an electrode assembly comprising a positive electrode and a negative electrode; a case accommodating the electrode assembly, the case having an open portion in one surface thereof; a cap plate part covering the open portion, the cap plate part being coupled to the case; a vent part on the cap plate part, the vent part having a gas flow path depending on an internal pressure of the case; and an opening/closing part on one surface of the case and facing the vent part, the opening/closing part configured to open and close the gas flow path. ### Claim 2 (depends on 1) The battery cell as claimed in claim 1, wherein: the cap plate part comprises a penetrating mounting hole, and the vent part is coupled to the penetrating mounting hole. ### Claim 3 (depends on 2) The battery cell as claimed in claim 2, wherein the vent part comprises: a vent base coupled along an inner circumferential surface of the mounting hole; and a vent cover connected to an inner circumferential surface of the vent base, the vent cover being able to open based on a pressure in the case. ### Claim 4 (depends on 3) The battery cell as claimed in claim 3, wherein: the vent cover comprises a plurality of vent covers, and a rupture groove portion having a preset depth is provided in a region to which the plurality of vent covers are connected. ### Claim 5 (depends on 4) The battery cell as claimed in claim 4, wherein the rupture groove portion is thinner than a region on which the rupture groove portion is absent. ### Claim 6 (depends on 1) The battery cell as claimed in claim 1, wherein the opening/closing part is on one surface of the cap plate part facing the electrode assembly. ### Claim 7 (depends on 1) The battery cell as claimed in claim 1, wherein: the opening/closing part comprises a plate-shaped opening/closing body, and a preset region of the plate-shaped opening/closing body is attachable to the one surface of the cap plate part. ### Claim 8 (depends on 7) The battery cell as claimed in claim 7, wherein the plate-shaped opening/closing body includes an elastically deformable material. ### Claim 9 (depends on 7) The battery cell as claimed in claim 7, wherein the plate-shaped opening/closing body comprises a cut portion that is cut along a preset path. ### Claim 10 (depends on 9) The battery cell as claimed in claim 9, wherein: the cut portion comprises a plurality of cut portions, and the plurality of the cut portions are at preset angles. ### Claim 11 (depends on 7) The battery cell as claimed in claim 7, wherein: the plate-shaped opening/closing body comprises a plurality of plate-shaped opening/closing bodies, and the plurality of plate-shaped opening/closing bodies are capable of overlapping in the preset region. ### Claim 12 (depends on 7) The battery cell as claimed in claim 7, wherein the plate-shaped opening/closing part further comprises an opening/closing cover capable of contacting the plate-shaped opening/closing body, the plate-shaped opening/closing part being separated from the opening/closing body depending on an internal pressure of the case. ### Claim 13 (depends on 12) The battery cell as claimed in claim 12, wherein: the plate-shaped opening/closing body includes an opening/closing hole, and the opening/closing cover covers the opening/closing hole. ### Claim 14 (depends on 13) The battery cell as claimed in claim 13, wherein the opening/closing cover further comprises: a cover body covering the opening/closing hole, the cover body being connected to the opening/closing cover; and a connector connecting the cover body and the plate-shaped opening/closing body. ### Claim 15 A battery module, comprising: a plurality of battery cells arranged in a preset direction; a module housing accommodating the plurality of battery cells; and connecting tabs electrically connecting the plurality of battery cells, wherein each of the battery cells comprises: an electrode assembly comprising a positive electrode and a negative electrode; a case accommodating the electrode assembly, the case having an open portion in one surface thereof; a cap plate part covering the open portion, the cap plate part coupled to the case; a vent part on the cap plate part, the vent part having a gas flow path depending on an internal pressure of the case; and an opening/closing part on one surface of the case, the opening/closing part facing the vent part, the opening/closing part being configured to open and close the flow path provided in the vent part. ### Claim 16 (depends on 15) The battery module as claimed in claim 15, wherein: the cap plate part has a penetrating mounting hole, and the vent part is coupled to the penetrating mounting hole. ### Claim 17 (depends on 16) The battery module as claimed in claim 16, wherein the vent part comprises: a vent base coupled along an inner circumferential surface of the mounting hole; and a vent cover connected to an inner circumferential surface of the vent base, the vent cover capable of rupturing to establish the flow path. ### Claim 18 (depends on 15) The battery module as claimed in claim 15, wherein: the opening/closing part comprises a plate-shaped opening/closing body, and a preset region of the plate-shaped opening/closing body is attachable to the one surface of the cap plate part. ### Claim 19 (depends on 18) The battery module as claimed in claim 18, wherein the plate-shaped opening/closing body comprises a cut portion that is cut along a preset path. ### Claim 20 (depends on 18) The battery module as claimed in claim 18, wherein: the plate-shaped opening/closing body comprises a plurality of plate-shaped opening/closing bodies, and the plurality of plate-shaped opening/closing bodies are capable of overlapping in the preset region.