# US 12,002,964 B2 · Electrochemical device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,002,964 B2 - Document ID: US12002964B2 - Status: Granted - Kind: B2 - Application number: 17/698,320 - Filed: 2022-03-18 - Published: 2022-09-29 - Granted: 2024-06-04 - Earliest claimed: 2021-03-29 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Qiangqiang Tang - Web page: https://patentgrep.com/patent/US12002964B2 ## CPC - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/667: {in the form of layers, e.g. coatings} - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres} - H01M 4/668: {Composites of electroconductive material and synthetic resins} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/027: {Negative electrodes} - 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 An electrochemical device includes a first electrode plate. The first electrode plate includes a current collector and an active material layer. The current collector includes a first substrate and a second substrate that are stacked together. The second substrate is disposed between the first substrate and the active material layer. And 100 MPa≤Rm1−Rm2≤400 MPa, Rm1 is a tensile strength of the first substrate and Rm2 is a tensile strength of the second substrate. The current collector that includes the first substrate and the second substrate is adopted, thereby suppressing both the elongation deformation of the electrode plate and the detachment of the active material layer. ## Claims ### Claim 1 An electrochemical device, comprising a first electrode plate, wherein the first electrode plate comprises: a current collector comprising a first substrate and a second substrate that are stacked together; an active material layer, wherein the second substrate is disposed between the first substrate and the active material layer; and 100 MPa≤Rm1−Rm2≤400 MPa, wherein Rm1 is a tensile strength of the first substrate and Rm2 is a tensile strength of the second substrate. ### Claim 2 (depends on 1) The electrochemical device according to claim 1, wherein 0.5≤d1/d2≤2.5, d1 is a thickness of the first substrate and d2 is a thickness of the second substrate. ### Claim 3 (depends on 1) The electrochemical device according to claim 1, wherein 400 MPa≤Rm1≤1000 MPa, and 1 MPa≤Rm2≤600 MPa. ### Claim 4 (depends on 1) The electrochemical device according to claim 1, wherein the first substrate comprises at least one of an alloy material, an inorganic ceramic material, a calendered copper foil, an electrodeposited nickel foil, or a calendered nickel foil. ### Claim 5 (depends on 1) The electrochemical device according to claim 1, wherein the second substrate comprises at least one of a porous copper foil, an electrodeposited copper foil, a foamed copper foil, or a conductive polymer material; and the conductive polymer material comprises a conductive agent and a polymer material, the conductive agent comprises a carbon material, and the polymer material comprises at least one of polyethylene, polypropylene, polystyrene, epoxy resin, or phenol resin. ### Claim 6 (depends on 1) The electrochemical device according to claim 1, wherein the current collector further comprises a first bonding layer, and the first bonding layer is disposed between the first substrate and the second substrate, and is configured to bond the first substrate and the second substrate. ### Claim 7 (depends on 1) The electrochemical device according to claim 1, wherein an elongation rate of the first substrate is less than or equal to 25%, and an elongation rate of the second substrate is less than or equal to 25%. ### Claim 8 (depends on 1) The electrochemical device according to claim 1, wherein, in a thickness direction of the first electrode plate, a projection of the active material layer is located within a region of a projection of the second substrate. ### Claim 9 (depends on 1) The electrochemical device according to claim 1, wherein a total thickness of the first substrate and the second substrate is 4 μm to 20 μm. ### Claim 10 (depends on 1) The electrochemical device according to claim 1, wherein the active material layer comprises a negative active material, the negative active material comprises a silicon-based material, and the silicon-based material comprises at least one of silicon, a silicon alloy, an oxide of silicon, or a silicon-carbon composite. ### Claim 11 (depends on 1) The electrochemical device according to claim 1, wherein the active material layer contacts the second substrate; or the first electrode plate further comprises a conductive layer disposed between the active material layer and the second substrate, and the conductive layer contacts both the active material layer and the second substrate. ### Claim 12 (depends on 1) The electrochemical device according to claim 1, wherein the current collector further comprises a third substrate, the third substrate is stacked along with the first substrate, the first substrate is disposed between the third substrate and the second substrate, the active material layer is further disposed on the third substrate, and 100 MPa≤Rm1−Rm3≤400 MPa, Rm1 is the tensile strength of the first substrate and Rm3 is a tensile strength of the third substrate. ### Claim 13 (depends on 1) The electrochemical device according to claim 1, wherein the electrochemical device further comprises a tab connected to the first substrate or the second substrate of the first electrode plate, and a thickness of the first substrate or the second substrate connected to the tab is greater than or equal to 3 μm. ### Claim 14 An electronic device, comprising an electrochemical device, the electrochemical device comprises a first electrode plate, wherein the first electrode plate comprising: a current collector comprising a first substrate and a second substrate that are stacked together; and an active material layer, wherein the second substrate is disposed between the first substrate and the active material layer, and 100 MPa≤Rm1−Rm2≤400 MPa, wherein Rm1 is a tensile strength of the first substrate and Rm2 is a tensile strength of the second substrate. ### Claim 15 (depends on 14) The electronic device according to claim 14, wherein a thickness d1 of the first substrate and a thickness d2 of the second substrate satisfy: 0.5≤d1/d2≤2.5. ### Claim 16 (depends on 14) The electronic device according to claim 14, wherein 400 MPa≤Rm1≤1000 MPa, and 1 MPa≤Rm2≤600 MPa. ### Claim 17 (depends on 14) The electronic device according to claim 14, wherein the first substrate comprises at least one of an alloy material, an inorganic ceramic material, a calendered copper foil, an electrodeposited nickel foil, or a calendered nickel foil. ### Claim 18 (depends on 14) The electronic device according to claim 14, wherein the second substrate comprises at least one of a porous copper foil, an electrodeposited copper foil, a foamed copper foil, or a conductive polymer material; and the conductive polymer material comprises a conductive agent and a polymer material, the conductive agent comprises a carbon material, and the polymer material comprises at least one of polyethylene, polypropylene, polystyrene, epoxy resin, or phenol resin. ### Claim 19 (depends on 14) The electronic device according to claim 14, wherein an elongation rate of the first substrate is less than or equal to 25%, and an elongation rate of the second substrate is less than or equal to 25%. ### Claim 20 (depends on 14) The electronic device according to claim 14, wherein a total thickness of the first substrate and the second substrate is 4 μm to 20 μm.