# US 12,603,364 B2 · Battery cell, battery, electrical device, and manufacturing method and device for battery cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,364 B2 - Document ID: US12603364B2 - Status: Granted - Kind: B2 - Application number: 17/897,119 - Filed: 2022-08-26 - Published: 2023-02-02 - Granted: 2026-04-14 - Earliest claimed: 2021-07-30 - Assignees: Contemporary Amperex Technology (Hong Kong) Limited - Applicants: Contemporary Amperex Technology (Hong Kong) Limited - Inventors: Huasheng Su; Chengyou Xing; Quankun Li; Kun Fang; Wenqi Zhu - Web page: https://patentgrep.com/patent/US12603364B2 ## CPC - H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) - H01M 10/04: Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) - H01M 10/0422: {Cells or battery with cylindrical casing} - H01M 10/052: Li-accumulators - H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/147: Lids or covers - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/169: by welding, brazing or soldering - H01M 50/171: using adhesives or sealing agents - H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence) - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/531: Electrode connections inside a battery casing - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/55: on the same side of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/566: by welding, soldering or brazing - H01M 50/593: Spacers; Insulating plates - H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) - 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, a housing, and an end cap. The electrode assembly includes a tab. The housing has an opening and includes a limit part, and is configured to accommodate the electrode assembly. The end cap includes a cap body and a convex part. The cap body is configured to cover the opening. In a thickness direction of the end cap, the cap body is located at one side of the limit part away from the electrode assembly. The limit part is configured to limit the cap body from moving relatively to the housing towards the electrode assembly. The convex part protrudes from an inner surface of the cap body towards the electrode assembly. The convex part is configured to go beyond the limit part away from the cap body, so that the convex part is pressed against the tab. ## Claims ### Claim 1 A battery cell, comprising: an electrode assembly, comprising a tab; a housing, having an opening and comprising a limit part, wherein the housing is configured to accommodate the electrode assembly; and an end cap, comprising: a cap body, wherein: the cap body is configured to cover the opening; in a thickness direction of the end cap, the cap body abuts against the limit part at one side of the limit part away from the electrode assembly; and the limit part is configured to limit the cap body from moving relatively to the housing towards the electrode assembly; and a convex part protruding from an inner surface of the cap body towards the electrode assembly, the convex part being configured to go beyond the limit part away from the cap body, so that the convex part is pressed against the tab, and the convex part being provided with a flow guiding channel configured to guide electrolyte solution laterally to an outer peripheral surface of the convex part. ### Claim 2 (depends on 1) The battery cell according to claim 1, wherein, in the thickness direction, the convex part has an abutting plane abutting against the tab, and the abutting plane is closer to the electrode assembly, compared with the limit part as a whole. ### Claim 3 (depends on 1) The battery cell according to claim 1, further comprising: an insulation member, configured to isolate the cap body from the housing, so as to realize insulating connection between the cap body and the housing. ### Claim 4 (depends on 3) The battery cell according to claim 3, wherein the insulation member comprises: an insulation part, configured to isolate the cap body from the housing; and a pressing part, connected to the insulation part and configured to press against the tab. ### Claim 5 (depends on 4) The battery cell according to claim 4, wherein, in the thickness direction, the pressing part extends from the insulation part towards the tab, to press against the tab. ### Claim 6 (depends on 4) The battery cell according to claim 4, wherein the pressing part is located at an outer periphery of the convex part, the limit part is located at an outer periphery of the pressing part, and the pressing part is configured to isolate the convex part and the limit part. ### Claim 7 (depends on 4) The battery cell according to claim 4, wherein the pressing part is of an annular structure. ### Claim 8 (depends on 3) The battery cell according to claim 3, wherein the cap body is sealingly connected to the housing through the insulation member. ### Claim 9 (depends on 1) The battery cell according to claim 1, wherein: the limit part is a first limit part; the housing further comprises a second limit part; and in the thickness direction, the cap body is located at one side of the second limit part facing the electrode assembly, and the second limit part and the first limit part are configured to jointly limit the cap body from moving relatively to the housing in the thickness direction. ### Claim 10 (depends on 9) The battery cell according to claim 9, wherein the second limit part has a flanging structure that is formed at a position of the opening by a portion of the housing folding inward. ### Claim 11 (depends on 10) The battery cell according to claim 10, wherein: the convex part is a first convex part; and the end cap further comprises a second convex part protruding from an outer surface of the cap body away from the electrode assembly, and an outer surface of the second convex part is flush with an outer surface of the second limit part. ### Claim 12 (depends on 9) The battery cell according to claim 9, wherein: the convex part is a first convex part; and the end cap further comprises a second convex part protruding from an outer surface of the cap body away from the electrode assembly, and an outer surface of the second convex part is flush with an outer surface of the second limit part. ### Claim 13 (depends on 1) The battery cell according to claim 1, wherein the convex part is welded to the tab. ### Claim 14 (depends on 1) A battery, comprising: the battery cell according to claim 1; and a box, configured to accommodate the battery cell. ### Claim 15 (depends on 14) The battery according to claim 14, wherein, in the thickness direction, the convex part has an abutting plane abutting against the tab, and the abutting plane is closer to the electrode assembly, compared with the limit part as a whole. ### Claim 16 (depends on 14) The battery according to claim 14, wherein the battery cell further comprises: an insulation member, configured to isolate the cap body from the housing, so as to realize insulating connection between the cap body and the housing. ### Claim 17 (depends on 14) An electrical device, comprising the battery according to claim 14. ### Claim 18 A battery cell, comprising: an electrode assembly, comprising a tab; a housing, having an opening and comprising a limit part, wherein the housing is configured to accommodate the electrode assembly; and an end cap, comprising: a cap body, wherein: the cap body is configured to cover the opening; in a thickness direction of the end cap, the cap body is located at one side of the limit part away from the electrode assembly; and the limit part is configured to limit the cap body from moving relatively to the housing towards the electrode assembly; and a convex part protruding from an inner surface of the cap body towards the electrode assembly, the convex part being configured to go beyond the limit part away from the cap body, so that the convex part is pressed against the tab; wherein the limit part is configured to cover at least a portion of the tab in a thickness direction of the end cap. ### Claim 19 A battery cell, comprising: an electrode assembly, comprising a tab; a housing, having an opening and comprising a limit part, wherein the housing is configured to accommodate the electrode assembly; an end cap, comprising: a cap body, wherein: the cap body is configured to cover the opening; in a thickness direction of the end cap, the cap body is located at one side of the limit part away from the electrode assembly; and the limit part is configured to limit the cap body from moving relatively to the housing towards the electrode assembly; and a convex part protruding from an inner surface of the cap body towards the electrode assembly, the convex part being configured to go beyond the limit part away from the cap body, so that the convex part is pressed against the tab; and an insulation member, comprising: an insulation part configured to isolate the cap body from the housing; and a pressing part connected to the insulation part and configured to extend from the insulation part towards the tab to press against a top surface of the tab.