# US 10,374,250 B2 · Stack-folding type electrode assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,250 B2 - Document ID: US10374250B2 - Status: Granted - Kind: B2 - Application number: 15/326,222 - Filed: 2016-02-15 - Published: 2017-07-20 - Granted: 2019-08-06 - Earliest claimed: 2015-02-27 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Vin-Na Jo; Jae-Hyun Lee; Ji-Hyun Kim - Web page: https://patentgrep.com/patent/US10374250B2 ## CPC - H01M 10/0459: {Cells or batteries with folded separator between plate-like electrodes} - H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0583: of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators - H01M 50/417: Polyolefins - H01M 50/423: Polyamide resins - H01M 50/443: Particulate material - H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials - H01M 50/451: comprising layers of only organic material and layers containing inorganic material - H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties - 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 disclosure provides a stack-folding typed electrode assembly including an electrode assembly having a structure in which a plurality of unit cells overlaps and a continuous folding separator is interposed between each overlapping part, wherein the continuous folding separator comprises a continuous porous polymer substrate having pores; and an organic-inorganic porous coating layer formed of a mixture of inorganic particles and a binder polymer, wherein the organic-inorganic porous coating layer is discontinuously provided at the overlapping part, to allow easy impregnation of an electrolyte solution, and reduce the volume compared to a traditional electrode assembly. ## Claims ### Claim 1 A stack-folding typed electrode assembly, comprising: an electrode assembly having a structure in which a plurality of unit cells overlaps and a continuous folding separator is interposed between each overlapping part, wherein the continuous folding separator comprises a continuous porous polymer substrate having pores; and an organic-inorganic porous coating layer formed of a mixture of inorganic particles and a binder polymer, wherein the organic-inorganic porous coating layer is discontinuously provided at the overlapping part, such that the organic-inorganic porous coating layer has a plurality of discontinuous portions, adjacent ones of the discontinuous portions being spaced apart from one another by gradually increasing intervals in a folding direction of the continuous folding separator. ### Claim 2 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein each of the discontinuous portions of the organic-inorganic porous coating layer has a first width that is equal to a second width of positive and negative electrodes of each of the unit cells, the first and second widths being in the folding direction of the continuous folding separator. ### Claim 3 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein each of the discontinuous portions of the organic-inorganic porous coating layer has a first width that is larger than a second width of a positive electrode of each of the unit cells by 0.2 to 10 mm, the first and second widths being in the folding direction of the continuous folding separator. ### Claim 4 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein the porous substrate is formed of at least one selected from the group consisting of polyolefin, polyethyleneterephthalate, polybutyleneterephthalate, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide and polyethylenenaphthalene. ### Claim 5 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein the inorganic particles are selected from the group consisting of an inorganic particle having a dielectric constant of higher than or equal to 5, an inorganic particle having a lithium ion transfer capability, and mixtures thereof. ### Claim 6 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein the continuous porous substrate of the folding separator has a thickness of from 1 to 100 μm. ### Claim 7 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein the discontinuous organic-inorganic porous coating layer of the folding separator has a thickness of from 0.01 to 20 μm. ### Claim 8 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein the folding separator has a unit length sufficient to surround the unit cells, and is folded each unit length and continuously surrounds the unit cells, starting from a center unit cell to an outermost unit cell. ### Claim 9 (depends on 1) An electrochemical device comprising the stack-folding typed electrode assembly defined in claim 1 received in a case. ### Claim 10 (depends on 9) The electrochemical device according to claim 9, wherein the electrochemical device is a lithium secondary battery. ### Claim 11 (depends on 1) The stack-folding typed electrode assembly according to claim 1, wherein each of the discontinuous portions of the organic-inorganic porous coating layer has a first width that is larger than the a second width of a negative electrode of each of the unit cells by 0.1 to 9 mm, the first and second widths being in the folding direction of the continuous folding separator.