# US 12,113,234 B2 · Cover assembly of secondary battery and secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,234 B2 - Document ID: US12113234B2 - Status: Granted - Kind: B2 - Application number: 18/172,036 - Filed: 2023-02-21 - Published: 2023-06-22 - Granted: 2024-10-08 - Earliest claimed: 2019-08-07 - Assignees: Contemporary Amperex Technology (Hong Kong) Limited - Applicants: Contemporary Amperex Technology Co., Limited - Inventors: Shiyao Zhang; Quankun Li; Peng Wang; Zhanyu Sun; Siying Huang; Jinmei Xu - Web page: https://patentgrep.com/patent/US12113234B2 ## CPC - H01M 50/30: Arrangements for facilitating escape of gases - H01M 50/342: Non-re-sealable arrangements - H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes} - H01M 50/147: Lids or covers - H01M 50/20: Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) - H01M 50/543: Terminals - H01M 50/578: in response to pressure - H01M 2200/00: Safety devices for primary or secondary batteries - 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 cover assembly includes a cover plate including a gas vent, a gas exhaust valve configured to seal the gas vent and deform in response to an increase in temperature to get out of a state of sealing the gas vent, and a sealing part. The gas exhaust valve includes a metal sheet and a fixing part. The metal sheet seals the gas vent. The sealing part is arranged between the metal sheet and the cover plate for sealing a gap between the metal sheet and the cover plate. The fixing part is connected to the metal sheet. The metal sheet is fixed to the cover plate by the fixing part. The fixing part is configured to deform in response to an increase in temperature in such a manner that the metal sheet gets out of the state of sealing the gas vent. ## Claims ### Claim 1 A cover assembly of a secondary battery, comprising: a cover plate comprising a gas vent; a gas exhaust valve configured to seal the gas vent and deform in response to an increase in temperature to get out of a state of sealing the gas vent in such a manner that gas inside a case of the secondary battery is directly exhausted to an exterior of the secondary battery via only the gas vent; and a sealing part arranged between the gas exhaust valve and the cover plate and surrounding the gas vent for sealing a gap between the gas exhaust valve and the cover plate; wherein: the gas exhaust valve comprises a metal sheet and a fixing part, and the metal sheet seals the gas vent; the sealing part is arranged between the metal sheet and the cover plate for sealing a gap between the metal sheet and the cover plate; the fixing part is connected to the metal sheet, and the metal sheet is fixed to the cover plate by the fixing part; and the fixing part is configured to deform in response to an increase in temperature in such a manner that the metal sheet gets out of the state of sealing the gas vent. ### Claim 2 (depends on 1) The cover assembly according to claim 1, wherein the fixing part has a melting point within a range of 80° C. to 200° C. ### Claim 3 (depends on 1) The cover assembly according to claim 1, wherein: the fixing part comprises a main body portion and a connection portion; the main body portion is connected to a surface of the metal sheet facing away from the sealing part; and along a length direction of the cover assembly, the connection portion is connected to two sides of the main body portion, and the connection portion is connected to the metal sheet. ### Claim 4 (depends on 3) The cover assembly according to claim 3, wherein the connection portion has a ring structure and surrounds a side wall of the metal sheet. ### Claim 5 (depends on 3) The cover assembly according to claim 3, wherein: one of the connection portion and the metal sheet is provided with a protrusion, and the other one of the connection portion and the metal sheet is provided with a first groove; and the protrusion matches the first groove. ### Claim 6 (depends on 3) The cover assembly according to claim 3, wherein: the main body portion is provided with a first center hole; and the first center hole is opposite to the gas vent. ### Claim 7 (depends on 1) The cover assembly according to claim 1, wherein along a thickness direction of the cover assembly, a projection of the fixing part at least partially overlaps a projection of the sealing part. ### Claim 8 (depends on 1) The cover assembly according to claim 1, further comprising: a pressing block fixed to the cover plate; wherein: the pressing block comprises a second center hole, and the second center hole is opposite to the gas vent; and the pressing block presses against a surface of the fixing part facing away from the sealing part, and the fixing part is fixed to the cover plate by the pressing block. ### Claim 9 (depends on 8) The cover assembly according to claim 8, wherein an orthograph projection of the second center hole on the cover plate overlaps with an orthographic projection of the gas vent on the cover plate. ### Claim 10 (depends on 8) The cover assembly according to claim 8, wherein along a thickness direction of the cover assembly, a projection of the pressing block does not overlap a projection of the metal sheet. ### Claim 11 (depends on 1) The cover assembly according to claim 1, wherein the cover plate is provided with a second groove, and the sealing part is at least partially received in the second groove. ### Claim 12 (depends on 1) The cover assembly according to claim 1, wherein the fixing part is in a shape of a plate and is integrally connected to a side of the metal sheet facing away from the sealing part. ### Claim 13 A secondary battery, comprising: a case comprising an opening; an electrode assembly received in the case, wherein the electrode assembly comprises a first electrode plate, a second electrode plate, and a separator arranged between the first electrode plate and the second electrode plate; and a cover assembly covering the opening of the case, wherein the cover assembly comprises: a cover plate comprising a gas vent; a gas exhaust valve configured to seal the gas vent and deform in response to an increase in temperature to get out of a state of sealing the gas vent in such a manner that gas inside a case of the secondary battery is directly exhausted to an exterior of the secondary battery via only the gas vent; and a sealing part arranged between the gas exhaust valve and the cover plate and surrounding the gas vent for sealing a gap between the gas exhaust valve and the cover plate; wherein: the gas exhaust valve comprises a metal sheet and a fixing part, and the metal sheet seals the gas vent; the sealing part is arranged between the metal sheet and the cover plate for sealing a gap between the metal sheet and the cover plate; the fixing part is connected to the metal sheet, and the metal sheet is fixed to the cover plate by the fixing part; and the fixing part is configured to deform in response to an increase in temperature in such a manner that the metal sheet gets out of the state of sealing the gas vent. ### Claim 14 (depends on 13) The secondary battery according to claim 13, wherein the fixing part has a melting point within a range of 80° C. to 200° C. ### Claim 15 (depends on 13) The secondary battery according to claim 13, wherein: the fixing part comprises a main body portion and a connection portion; the main body portion is connected to a surface of the metal sheet facing away from the sealing part; and along a length direction of the cover assembly, the connection portion is connected to two sides of the main body portion, and the connection portion is connected to the metal sheet. ### Claim 16 (depends on 13) The secondary battery according to claim 13, wherein along a thickness direction of the cover assembly, a projection of the fixing part at least partially overlaps a projection of the sealing part. ### Claim 17 (depends on 13) The secondary battery according to claim 13, wherein the cover assembly further comprises: a pressing block fixed to the cover plate; wherein: the pressing block comprises a second center hole, and the second center hole is opposite to the gas vent; and the pressing block presses against a surface of the fixing part facing away from the sealing part, and the fixing part is fixed to the cover plate by the pressing block. ### Claim 18 (depends on 13) The secondary battery according to claim 13, wherein the cover plate is provided with a second groove, and the sealing part is at least partially received in the second groove. ### Claim 19 (depends on 13) The secondary battery according to claim 13, wherein the fixing part is in a shape of a plate and is integrally connected to a side of the metal sheet facing away from the sealing part.