Abstract: An insulation layer that improves the safety of a battery, a battery cell sheet and a battery, include an insulation layer having a non-aqueous electrolyte, insulation layer particles, and an insulation layer binder, wherein the non-aqueous electrolyte has a non-aqueous solvent with a volatilization temperature of less than 246.degree.C., and when the insulation layer has been heated higher than a reference temperature, the temperature at which the weight of the insulation layer reduces by 10% compared to the weight of the insulation layer at the reference temperature is at least 3.degree.C. higher than the temperature at which the weight of the non-aqueous solvent reduces by 10% compared to the weight of the non-aqueous solvent at the reference temperature. Also provided are a battery cell sheet and a battery that are provided with said insulation layer.

Abstract: A lithium secondary battery having a positive electrode, a negative electrode, and an electrolyte, wherein the positive electrode is constituted by a positive electrode mixture layer containing a positive electrode active material, a binder, and a conductive agent being formed on a positive electrode collector, the negative electrode is constituted by a negative electrode mixture layer containing a negative electrode active material, the binder, and the conductive agent being formed on a negative electrode collector, and the conductive agent contained in both of the positive electrode mixture layer and the negative electrode mixture layer is a fibrous conductive agent or a mixture of the fibrous conductive agent and a particulate conductive agent and an aspect ratio of the fibrous conductive agent is 20 or more.

Abstract: A high-input and high-output battery having a large capacity while guaranteeing safety is provided. In a lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity of the battery being 30 Ah or more, the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector, and the positive electrode composite has following configuration. The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn), a density of the positive electrode composite is 2.4 g/cm3 or more and 2.7 g/cm3 or less, and a porosity of the active electrode composite is 29.5% or more and 40.0% or less. Furthermore, a weight ratio (NMC/sp-Mn) of the mixed active materials is set to 10/90 or more and 60/40 or less.

Abstract: In a lithium ion battery having a discharge capacity of 30 Ah or more and 125 Ah or less, the positive electrode composite has the following configuration: The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and olivine lithium iron phosphate (LFP), a density of the positive electrode composite is 2.0 g/cm3 or more and 2.6 g/cm3 or less, and an application quantity of the positive electrode composite is 100 g/m2 or more and 200 g/m2 or less. Furthermore, a weight ratio (NMC/LFP) of the mixed active materials is set to 10/90 or more and 60/40 or less. Alternatively, when a discharge capacity is defined as X and the weight ratio is defined as Y, the relation of Y<?0.0067X+1.84 (30?X?125) is satisfied.

Abstract: A high-input and high-output battery having a large capacity while guaranteeing safety is provided. As a composition of an electrolytic solution, a composition ratio of ethylene carbonate (EC) is 20 vol % or more and 30 vol % or less, and a composition ratio of dimethyl carbonate (DMC) is 36 vol % or more and 50 vol % or less, and a composition ratio ? (DMC/EMC) of dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) is 1.0???1.7. Furthermore, a composition ratio of an additive is 0.1 wt. % or more and 1.0 wt. % or less, and a concentration of lithium salt is 1.0 mol/L or more and 1.5 mol/L or less.

Abstract: Disclosed are an electrode for a lithium secondary battery which includes a metal substrate and a plated layer arranged on the metal substrate and bearing active material particles and resin particles embedded therein, in which a part of the active material particles and the resin particles has a protruding portion beyond the plated layer; and a lithium secondary battery using the electrode. The electrode helps the lithium secondary battery to be resistant to deterioration and property degradation at high temperature and allows the battery to have high input-output performance and to be suitable typically for hybrid electric vehicles.

Abstract: A high-input and high-output battery having a large capacity while guaranteeing safety is provided. In a lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity of the battery being 30 Ah or more, the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector, and the positive electrode composite has following configuration. The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn), a density of the positive electrode composite is 2.4 g/cm3 or more and 2.7 g/cm3 or less, and a porosity of the active electrode composite is 29.5% or more and 40.0% or less. Furthermore, a weight ratio (NMC/sp-Mn) of the mixed active materials is set to 10/90 or more and 60/40 or less.

Abstract: In a lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity of the battery being 30 Ah or more and 125 Ah or less, the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector, and the positive electrode composite has following configuration. The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and olivine lithium iron phosphate (LFP), a density of the positive electrode composite is 2.0 g/cm3 or more and 2.6 g/cm3 or less, and an application quantity of the positive electrode composite is 100 g/m2 or more and 200 g/m2 or less. Furthermore, a weight ratio (NMC/LFP) of the mixed active materials is set to 10/90 or more and 60/40 or less.

Abstract: A high-input and high-output battery having a large capacity while guaranteeing safety is provided. In a lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity of the battery being 30 Ah or more, the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector, and the positive electrode composite has following configuration. The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn), a density of the positive electrode composite is 2.4 g/cm3 or more and 2.7 g/cm3 or less, and an application quantity of the positive electrode composite is 175 g/m2 or more and 250 g/m2 or less.

Abstract: In a lithium ion battery provided with a cleavage valve that discharges gas in accordance with an internal pressure rise, and a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah, a positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn). A density of the positive electrode composite is 2.4 to 2.7 g/cm3, an application quantity of the positive electrode composite is 175 to 250 g/cm2, and when a weight ratio (NMC/sp-Mn) is defined as Y, a relation of Y<?0.0062X+1.05 is satisfied. Also, a working pressure of the cleavage valve is 1.0 to 5.0 MPa when the discharge capacity X is 30 Ah or more and 40 Ah or less, and 1.0 to 4.0 MPa when X is more than 40 Ah and 80 Ah or less.

Abstract: A high-input and high-output battery having a large capacity while guaranteeing safety is provided. As a composition of an electrolytic solution, a composition ratio of ethylene carbonate (EC) is 20 vol % or more and 30 vol % or less, and a composition ratio of dimethyl carbonate (DMC) is 36 vol % or more and 50 vol % or less, and a composition ratio ? (DMC/EMC) of dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) is 1.05???1.7. Furthermore, a composition ratio of an additive is 0.1 wt. % or more and 1.0 wt. % or less, and a concentration of lithium salt is 1.0 mol/L or more and 1.5 mol/L or less.

Abstract: A lithium-ion rechargeable battery module having a plurality of lithium-ion battery cells, arranged that battery cells located at an high temperature portion of the module are electrically connected in parallel with battery cells located at a low temperature portion of the module. The battery cells at the high temperature portion have a higher electric resistance at 20° C. and a better high-temperature storage characteristic at 50° C. than those of the battery cells located at the low temperature portion.

Abstract: A rechargeable battery system that controls charge/discharge of a lithium ion rechargeable battery, includes: an internal resistance detection unit that detects or estimates an internal resistance value indicating an internal resistance at the lithium ion rechargeable battery; and a discharge control unit that executes control so as to set a discharge suspension period while the lithium ion rechargeable battery is discharged if the internal resistance value detected via the internal resistance detection unit during discharge of the lithium ion rechargeable battery exceeds a first threshold value.

Abstract: A lithium secondary battery includes a positive electrode which can occlude and discharge lithium ion, a negative electrode which can occlude and discharge lithium ion, a separator which is disposed between the positive electrode and the negative electrode, and an electrolyte. In order to suppress a deterioration for a period of high temperature storage at 50° C. or more, the electrolyte includes a compound within whose molecule a plurality of polymerizable functional groups are included. The electrolyte can include a compound represented by the formula 3: wherein each of Z1 and Z2 represents a polymerizable functional group including any one selected from the group consisting of allyl group, methallyl group, vinyl group, acryl group and methacryl group.

Abstract: Provided is a secondary battery system including: a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; and a voltmeter which detects a voltage of the secondary battery, in which a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge are obtained on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a large current on the basis of a relation between the two obtained direct current resistances.

Abstract: This invention provides a lithium-ion battery in which a coating film forming agent degradation reaction is prevented. A lithium-ion battery 100 in which electrodes 1 and 2 and an electrolyte are accommodated in a battery container 13 , and which has a means of for adding a coating film forming agent 20 for adding a coating film forming agent 21 that forms a coating film on the surface of each of electrodes 1 and 2 to an electrolyte in a battery container 13 is provided. With the use of such means of adding a coating film forming agent 20, a reaction of electrochemical degradation of a coating film forming agent 21 is prevented, allowing long-term preservation. Also, with the addition of a coating film forming agent 21 to an electrolyte, a deteriorated coating film on the surface of each of electrodes 1 and 2 is repaired such that a lithium-ion battery 100 can be regenerated, resulting in extension of battery life.

Abstract: A lithium secondary battery is intended to suppress deterioration upon storage at high temperature of 50° C. or higher without deteriorating the output characteristics at a room temperature. The battery includes a positive electrode capable of occluding and releasing lithium ions, a negative electrode capable of occluding and releasing lithium ions, a separator disposed between the positive electrode and the negative electrode, and an electrolyte. The electrolyte contains a compound having a double bond in the molecule and a compound having a plurality of polymerizable functional groups in the molecule, and the electrolyte contains a compound represented by formula (4): (in which Z1 and Z2 each represent any one of an allyl group, a methallyl group, a vinyl group, an acryl group, and a methacryl group).

Abstract: A lithium ion battery includes: a positive electrode capable of occluding and emitting lithium ions; a negative electrode that is capable of occluding and emitting lithium ions; a separator disposed between the positive electrode and the negative electrode; and an electrolytic solution. The negative electrode of the lithium ion battery is coated with a lithium ion conductive polymer. The lithium ion battery maintains high-temperature storage characteristics at temperatures of 50° C. or more and output characteristics at room temperature of the lithium ion battery are improved.

Abstract: A lithium-ion rechargeable battery module having a plurality of lithium-ion battery cells, arranged that battery cells located at an high temperature portion of the module are electrically connected in parallel with battery cells located at a low temperature portion of the module. The battery cells at the high temperature portion have a higher electric resistance at 20° C. and a better high-temperature storage characteristic at 50° C. than those of the battery cells located at the low temperature portion.

Abstract: The present invention provides a lithium secondary battery which has improved safety, mainly coming from use of an electrolyte solution which is not inflammable at room temperature (20° C.), while not deteriorating output characteristics at low temperatures and room temperature or output maintenance characteristics after storage at high temperature (50° C.). The lithium secondary battery of the present invention, encased in a container, is provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution containing a cyclic carbonate and a linear carbonate as solvents and a compound such as VC at composition ratios of 18.0 to 30.0%, 74.0 to 81.9% and 0.1 to 1.0%, respectively, based on the whole solvents, all percentages by volume.