# US 11,909,065 B2 · Cover plate assembly, battery cell, battery module, battery pack, and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,065 B2 - Document ID: US11909065B2 - Status: Granted - Kind: B2 - Application number: 17/552,566 - Filed: 2021-12-16 - Published: 2022-04-07 - Granted: 2024-02-20 - Earliest claimed: 2019-12-26 - Assignees: Contemporary Amperex Technology Co., Limited - Applicants: Contemporary Amperex Technology Co., Limited - Inventors: Lulu Bai - Web page: https://patentgrep.com/patent/US11909065B2 ## CPC - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/143: Fireproof; Explosion-proof - H01M 50/164: having a layered structure - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) - H01M 50/55: on the same side of the cell - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - 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 cover plate assembly, a battery cell, a battery module, a battery pack and an apparatus are disclosed. The cover plate assembly includes a top cover plate, where the top cover plate is provided with an explosion-proof valve; and an insulating plate, laminated with the top cover plate, where the insulating plate includes a base portion and a thinned region located on the base portion, the thinned region is formed by thinning the base portion, and a region enclosed by boundaries of an orthographic projection of the thinned region at least partially overlaps an orthographic projection of the explosion-proof valve in a thickness direction of the cover plate assembly. The thinned region is formed by thinning the base portion. ## Claims ### Claim 1 A cover plate assembly for a battery cell, wherein the cover plate assembly comprises: a top cover plate, wherein the top cover plate is provided with an explosion-proof valve; and an insulating plate, laminated with the top cover plate, wherein the insulating plate comprises a base portion and a thinned region located in the base portion, the thinned region is formed by thinning the base portion, and in a thickness direction of the cover plate assembly, a region enclosed by boundaries of an orthographic projection of the thinned region at least partially overlaps an orthographic projection of the explosion-proof valve; wherein the insulating plate comprises two surfaces disposed opposite each other in the thickness direction, and the thinned region comprises a groove formed by at least one of the two surfaces being recessed; the insulating plate comprises a recess portion, and the recess portion is formed by the base portion being recessed in a direction away from the top cover plate, and is disposed corresponding to the explosion-proof valve in the thickness direction; and the groove is disposed on the periphery of the recess portion, the thickness of the insulating plate at the thinned region is smaller than the thickness of the insulating plate at the recess portion. ### Claim 2 (depends on 1) The cover plate assembly according to claim 1, wherein an area of an orthographic projection of the recess portion is greater than or equal to an area of the orthographic projection of the explosion-proof valve in the thickness direction. ### Claim 3 (depends on 1) The cover plate assembly according to claim 1, wherein the groove is formed by extending around an outer circumference of the recess portion; or the groove comprises more than two sub-grooves which are spaced apart along an outer circumference of the recess portion. ### Claim 4 (depends on 1) The cover plate assembly according to claim 1, wherein a shape of the recess portion matches a shape of the explosion-proof valve. ### Claim 5 (depends on 1) The cover plate assembly according to claim 1, wherein the recess portion comprises a first arc-shaped outer edge; and the groove is formed by the first arc-shaped outer edge extending along a direction away from the recess portion, a second arc-shaped outer edge is formed on a side of the groove facing away from the recess portion, and the groove is distributed as an arc-shaped strip. ### Claim 6 (depends on 1) A battery cell, comprising: a housing and an electrode unit located in the housing; and the cover plate assembly according to claim 1, wherein the cover plate assembly covers an opening of the housing, and the insulating plate is located on a side of the cover plate facing toward the electrode unit. ### Claim 7 (depends on 6) A battery module, comprising the battery cell according to claim 6. ### Claim 8 (depends on 7) A battery pack, comprising the battery module according to claim 7. ### Claim 9 (depends on 8) An apparatus that uses a battery cell as a power source, wherein the battery cell is the battery cell according to claim 8.