# US 11,444,333 B2 · Electrochemical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,333 B2 - Document ID: US11444333B2 - Status: Granted - Kind: B2 - Application number: 16/423,389 - Filed: 2019-05-28 - Published: 2020-05-07 - Granted: 2022-09-13 - Earliest claimed: 2018-11-05 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Qiang Zheng; Zhanzhao Fang; Qi Dang - Web page: https://patentgrep.com/patent/US11444333B2 ## CPC - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 4/366: {as layered products} - H01M 4/667: {in the form of layers, e.g. coatings} - H01M 4/70: characterised by shape or form - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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 The present application relates to an electrochemical device. Specifically, the present application provides an electrochemical device, including a cell and a shell enclosing the cell; the cell includes a jelly roll including a first electrode and a second electrode spaced from each other, a separator is disposed between the first electrode and the second electrode, the first electrode and the second electrode are wound to form the cell; the first electrode includes a first current collector, the first current collector includes a first surface and a second surface disposed oppositely; the first surface faces the shell, and includes a coated region coated with a first active material and an uncoated region; the uncoated region includes a first uncoated region disposed at an end of the jelly roll, and the first uncoated region includes alternating bent portions and straight portions; and the bent portions are provided with an insulating layer. ## Claims ### Claim 1 An electrochemical device, comprising: a cell and a shell enclosing the cell; wherein the cell comprises a jelly roll comprising a first electrode, a second electrode spaced apart from the first electrode, and a separator disposed between the first electrode and the second electrode, and the first electrode and the second electrode are wound to form the jelly roll; the first electrode comprises a first current collector, the first current collector comprises a first surface and a second surface disposed oppositely; the first surface faces the shell and comprises a coated region coated with a first active material, and an uncoated region without the first active material; the uncoated region comprises a first uncoated region disposed at an end of the jelly roll, and the first uncoated region comprises alternating bent portions and straight portions; the bent portions comprise a first bent portion and a second bent portion; the first bent portion is a right side of the jelly roll, and the second bent portion is a left side of the jelly roll, the first bent portion and the second bent portion are provided with first insulating layers; and the straight portions include a first straight portion and a second straight portion, the first straight portion is an upper surface of the jelly roll, and the second straight portion is a lower surface of the jelly roll, wherein the bent portions further comprise a third bent portion corresponding to the first bent portion in the first uncoated region; and a third insulating layer is in direct contact with the third bent portion and is physically distinct from the separator. ### Claim 2 (depends on 1) The electrochemical device according to claim 1, wherein the straight portions are at least partially provided with the first insulating layers. ### Claim 3 (depends on 2) The electrochemical device according to claim 2, wherein the coating rate of the first insulating layers at the straight portions is about 5% to about 100%. ### Claim 4 (depends on 3) The electrochemical device according to claim 3, wherein the coating rate of the first insulating layers at the straight portions is about 10% to about 100%. ### Claim 5 (depends on 4) The electrochemical device according to claim 4, wherein the coating rate of the first insulating layers at the straight portions is about 10% to about 75%. ### Claim 6 (depends on 4) The electrochemical device according to claim 4, wherein the coating rate of the first insulating layers at the straight portions is about 15%. ### Claim 7 (depends on 4) The electrochemical device according to claim 4, wherein the coating rate of the first insulating layers at the straight portions is about 60%. ### Claim 8 (depends on 1) The electrochemical device according to claim 1, wherein the first insulating layers have a thickness of not less than about 0.5 μm. ### Claim 9 (depends on 8) The electrochemical device according to claim 8, wherein the first insulating layers have a thickness of about 0.5 μm to about 20 μm. ### Claim 10 (depends on 8) The electrochemical device according to claim 8, wherein the first insulating layers have a thickness of about 10 μm to about 20 μm. ### Claim 11 (depends on 8) The electrochemical device according to claim 8, wherein the first insulating layers have a thickness of about 10 μm to about 15 μm. ### Claim 12 (depends on 8) The electrochemical device according to claim 8, wherein the first insulating layers have a thickness of about 20 μm. ### Claim 13 (depends on 1) The electrochemical device according to claim 1, wherein the second electrode does not comprise a second current collector without a second active material at the end of the jelly roll. ### Claim 14 (depends on 1) The electrochemical device according to claim 1, wherein the first insulating layers comprise an insulating material, the insulating material comprises an inorganic oxide, a polymer adhesive, or a combination thereof. ### Claim 15 (depends on 14) The electrochemical device according to claim 14, wherein the inorganic oxide comprises at least one of aluminum oxide, magnesium oxide, silicon oxide, zirconium oxide, calcium oxide, or boehmite. ### Claim 16 (depends on 14) The electrochemical device according to claim 14, wherein the polymer adhesive comprises at least one of polyvinylidene fluoride, styrene butadiene rubber, or polyacrylate. ### Claim 17 (depends on 1) The electrochemical device according to claim 1, wherein the electrochemical device is a lithium ion battery. ### Claim 18 (depends on 1) The electrochemical device according to claim 1, wherein at least one of the first and second straight portions is configured with a double-sided adhesive tape to adhere the cell to the shell.