# US 7,745,049 B2 · Nonaqueous electrolyte secondary battery and battery module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,745,049 B2 - Document ID: US7745049B2 - Status: Granted - Kind: B2 - Application number: 12/273,256 - Filed: 2008-11-18 - Published: 2009-03-19 - Granted: 2010-06-29 - Earliest claimed: 2003-09-26 - Assignees: Kabushiki Kaisha Toshiba - Inventors: Norio Takami; Hiroki Inagaki; Yoshinao Tatebayashi - Web page: https://patentgrep.com/patent/US7745049B2 ## CPC - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 10/052: Li-accumulators - H01M 50/119: Metals - H01M 50/133: Thickness - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 50/121: Organic material - H01M 50/124: having a layered structure - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/027: {Negative electrodes} - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A nonaqueous electrolyte secondary battery includes a case, a nonaqueous electrolyte provided in the case, a positive electrode provided in the case, and a negative electrode provided in the case, the negative electrode comprising a negative electrode current collector and a negative electrode layer that is carried on the negative electrode current collector and contains negative electrode active material particles, and the negative electrode current collector comprising an aluminum foil having an average crystal grain size of 50 μm or less or an aluminum alloy foil having an average crystal grain size of 50 μm or less. ## Claims ### Claim 1 A nonaqueous electrolyte secondary battery comprising: a case; a nonaqueous electrolyte provided in the case; a positive electrode provided in the case; and a negative electrode provided in the case, the negative electrode comprising a negative electrode current collector and a negative electrode layer that is carried on the negative electrode current collector and contains negative electrode active material particles having a lithium insertion potential of 0.4V to about 3V (vs. Li/Li+), and the negative electrode current collector including an aluminum foil having an average crystal grain size of 0.01 to 50 μm or an aluminum alloy foil having an average crystal grain size of 0.01 to 50 μm. ### Claim 2 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein an average primary particle size of the negative electrode active material particles is 0.001 to 1 μm. ### Claim 3 (depends on 2) The nonaqueous electrolyte secondary battery according to claim 2, wherein the average primary particle size is 0.001 to 0.3 μm. ### Claim 4 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the negative electrode active material particles include lithium titanium composite oxide particles. ### Claim 5 (depends on 4) The nonaqueous electrolyte secondary battery according to claim 4, wherein a composition of lithium titanium composite oxide particles is expressed in Li4+xTi5O12, where x is in a range of −1≦x≦3. ### Claim 6 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the average crystal grain size of the aluminum foil and the aluminum alloy foil is 0.1 to 3 μm. ### Claim 7 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the aluminum alloy foil is formed of an alloy containing aluminum and at least one element selected from the group consisting of iron, magnesium, zinc, manganese, and silicon. ### Claim 8 (depends on 7) The nonaqueous electrolyte secondary battery according to claim 7, wherein a content of aluminum in the alloy is 95 to 98.5 wt. %. ### Claim 9 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein a thickness of the negative electrode current collector is 3 to 20 μm, and a density of the negative electrode is 1.5 to 5 g/cm3. ### Claim 10 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the case is made of aluminum having an average crystal grain size of 0.01 to 50 μm or aluminum alloy having an average crystal grain size of 0.01 to 50 μm. ### Claim 11 (depends on 10) The nonaqueous electrolyte secondary battery according to claim 10, wherein the average crystal grain size of aluminum and aluminum alloy is 0.1 to 10 μm. ### Claim 12 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the positive electrode comprises a positive electrode current collector including an aluminum foil having an average crystal grain size of 0.01 to 50 μm or an aluminum alloy foil having an average crystal grain size of 0.01 to 50 μm. ### Claim 13 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the nonaqueous electrolyte contains γ-butyrolactone. ### Claim 14 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the lithium insertion potential is 0.4 to 3 V (vs. Li/Li+). ### Claim 15 (depends on 1) The nonaqueous electrolyte secondary battery according to claim 1, wherein the lithium insertion potential is 0.4 to 2 V (vs. Li/Lie). ### Claim 16 (depends on 1) A battery pack comprising the nonaqueous electrolyte secondary battery according to claim 1. ### Claim 17 A battery module comprising single cells, each single cell comprising: a case; a nonaqueous electrolyte provided in the case; a positive electrode provided in the case; and a negative electrode provided in the case, the negative electrode comprising a negative electrode current collector and a negative electrode layer that is carried on the negative electrode current collector and contains negative electrode active material particles having a lithium insertion potential of 0.4V to about 3V (vs. Li/Li+), and the negative electrode current collector including an aluminum foil having an average crystal grain size of 0.01 to 50 μm or an aluminum alloy foil having an average crystal grain size of 0.01 to 50 μm. ### Claim 18 (depends on 17) The battery module according to claim 17, further comprising a series connection unit having single cells connected in series, and a cushion member which covers a principal plane of the series connection unit. ### Claim 19 (depends on 17) The battery module according to claim 17, further comprising a series connection unit having single cells connected in series, and wherein the single cells are stacked in a thickness direction. ### Claim 20 (depends on 19) The battery module according to claim 19, further comprising a cushion member which covers the single cell of the outermost layer of the series connection unit.