Abstract: A battery pack includes cells, a pressure contributing component contributing to a change in pressure in the battery pack, at least one pressure sensor configured to detect the pressure in the battery pack, and at least one voltage sensor configured to detect a voltage of the cells. A thermal chain determination method includes detecting the pressure in the battery pack, detecting the voltage of the cells, determining that the pressure in the battery pack is abnormal when an amount or rate of change is larger than a predetermined value, determining that the voltage of the cells is abnormal when an amount or rate of change in the detected voltage is larger than a predetermined value, or when an absolute value of the voltage of the cells is smaller than a predetermined value, and determining that a thermal chain occurs when both the pressure and the voltage are abnormal.

Abstract: Provided is a tab lead for a secondary battery including tab lead metal that has an adhesion interface with sealing resin. The adhesion interface is provided with a surface treatment film formed of a material including a polymer with carboxylic acid anhydride groups. Further provided is a nonaqueous electrolyte secondary battery including the tab lead for the secondary battery as a leading terminal of at least one of a positive electrode and a negative electrode.

Abstract: A secondary battery has a flat shape and houses a power generation element together with an electrolyte solution inside an exterior body. A terminal includes: a terminal main body including a nickel plane containing nickel on at least a surface thereof; an anticorrosive layer covering at least a part of the nickel plane that is more on the inside of the exterior body than a held portion; and a resin layer covering at least the held portion of a surface of the anticorrosive layer and having an internal extension portion extending from the held portion to the inside of the exterior body.

Abstract: Provided is a lithium ion secondary battery that includes a package housing a positive electrode, a negative electrode, a separator, and an electrolyte solution. In the lithium ion secondary battery: the package including a stack including a metal base material, an acid modified polypropylene layer, and a polypropylene layer stacked sequentially; the polypropylene layer forms an inner surface of the package; the package includes a heat-sealed portion and a non-sealed portion; and the thickness of one acid modified polypropylene layer included in the heat-sealed portion is smaller than a half of the thickness of the polypropylene layer included in the heat-sealed portion.

Abstract: Provided is a tab lead for a secondary battery including tab lead metal that has an adhesion interface with sealing resin. The adhesion interface is provided with a surface treatment film formed of a material including a polymer with carboxylic acid anhydride groups. Further provided is a nonaqueous electrolyte secondary battery including the tab lead for the secondary battery as a leading terminal of at least one of a positive electrode and a negative electrode.

Abstract: A secondary battery has a flat shape and houses a power generation element together with an electrolyte solution inside an exterior body. A terminal includes: a terminal main body including a nickel plane containing nickel on at least a surface thereof; an anticorrosive layer covering at least a part of the nickel plane that is more on the inside of the exterior body than a held portion; and a resin layer covering at least the held portion of a surface of the anticorrosive layer and having an internal extension portion extending from the held portion to the inside of the exterior body.

Abstract: A lithium-ion capacitor excellent in durability, which has high energy density and high capacity retention ratio when the capacitor is charged and discharged at a high load, is disclosed. The lithium-ion capacitor includes a positive electrode, a negative electrode and an aprotic organic solvent of a lithium salt as an electrolyte solution. In the lithium-ion capacitor, a positive electrode active material allows lithium ions and/or anions to be doped thereinto and de-doped therefrom, and a negative electrode active material allows lithium ions to be doped thereinto and de-doped therefrom. At least one of the negative electrode and the positive electrode is pre-doped with lithium ions so that after the positive electrode and the negative electrode are shortcircuited, a potential of the positive electrode is 2 V (relative to Li/Li+) or lower. A thickness of a positive electrode layer of the positive electrode is within a range from 18 to 108 ?m.

Abstract: To present a carbon material which provides an electrical storage device not only ensuring a high energy density but also realizing a high output and an excellent low temperature performance. A negative electrode active material for an electrical storage device employing an aprotic organic solvent electrolyte solution containing a lithium salt as an electrolytes characterized in that it is made of a carbon material having a specific surface area of from 0.01 to 50 m2/g and a total mesopore volume of from 0.005 to 1.0 cc/g, wherein volumes of mesopores having pore diameters of from 100 to 400 ? occupy at least 25% of the total mesopore volume.

Abstract: A lithium ion capacitor includes a positive electrode made of a material capable of reversibly carrying either one or both of a lithium ion and an anion, a negative electrode made of a material capable of reversibly carrying a lithium ion, and an electrolytic solution made of a non-protonic organic solvent electrolytic solution of a lithium salt. A negative electrode active material is non-graphitizable carbon having a ratio of number of hydrogen atoms to number of carbon atoms of zero or more and less than 0.05. The lithium ion is doped in advance to either one or both of the negative electrode and the positive electrode so that a negative electrode potential when a cell is discharged to a voltage one half a charging voltage of the cell is 0.15 V or less relative to a lithium ion potential.

Abstract: A lithium ion capacitor includes a positive electrode made of a material capable of reversibly doping and dedoping lithium ions and/or anions; a negative electrode made of a material capable of reversibly doping and dedoping lithium ions; and an electrolytic solution made of an aprotonic organic solvent electrolyte solution of a lithium salt. When the negative electrode and/or positive electrode and a lithium ion supply source are electrochemically brought into contact, lithium ions are doped in a negative electrode and/or positive electrode. A positive electrode potential after the positive electrode and negative electrode are short-circuited is 2.0 V (vs. Li/Li+) or less. The positive electrode and/or negative electrode has a current collector made of a metal foil that has many holes that penetrate through both sides and have an average diameter of inscribed circles of the through-holes of 100 ?m or less.

Abstract: A lithium ion capacitor having high energy density, high output density, high capacity and high safety includes a positive electrode made of a material capable of being reversibly doped with lithium ions and/or anions, a negative electrode made of a material capable of being reversively doped with lithium ions, and an aprotic organic solution of a lithium salt as an electrolytic solution. Wherein, the positive electrode and the negative electrode are laminated or wound with a separator interposed between them, the area of the positive electrode is smaller than the area of the negative electrode. The face of the positive electrode is substantially covered by the face of the negative electrode when they are laminated or wound.

Abstract: A lithium ion capacitor includes a positive electrode made of a material capable of reversibly carrying either one or both of a lithium ion and an anion, a negative electrode made of a material capable of reversibly carrying a lithium ion, and an electrolytic solution made of a non-protonic organic solvent electrolytic solution of a lithium salt. A negative electrode active material is non-graphitizable carbon having a ratio of number of hydrogen atoms to number of carbon atoms of zero or more and less than 0.05. The lithium ion is doped in advance to either one or both of the negative electrode and the positive electrode so that a negative electrode potential when a cell is discharged to a voltage one half a charging voltage of the cell is 0.15 V or less relative to a lithium ion potential.

Abstract: A lithium ion capacitor includes a positive electrode made of a material capable of reversibly doping and dedoping lithium ions and/or anions; a negative electrode made of a material capable of reversibly doping and dedoping lithium ions; and an electrolytic solution made of an aprotonic organic solvent electrolyte solution of a lithium salt. When the negative electrode and/or positive electrode and a lithium ion supply source are electrochemically brought into contact, lithium ions are doped in a negative electrode and/or positive electrode. A positive electrode potential after the positive electrode and negative electrode are short-circuited is 2.0 V (vs. Li/Li+) or less. The positive electrode and/or negative electrode has a current collector made of a metal foil that has many holes that penetrate through both sides and have an average diameter of inscribed circles of the through-holes of 100 ?m or less.

Abstract: A lithium ion capacitor includes a positive electrode including a positive electrode active material capable of reversibly doping either one or both of a lithium ion and an anion, a negative electrode including a negative electrode active material capable of reversibly doping a lithium ion, and a non-protonic organic solvent electrolytic solution of a lithium salt as an electrolytic solution. The lithium ion is doped to either one or both of the negative electrode and positive electrode so that the positive electrode potential after the positive electrode and negative electrode are short-circuited is 2.0 V or less. A surface of the negative electrode is covered with a polymer.

Abstract: A lithium ion capacitor having high energy density, high output density, high capacity and high safety is provided. A lithium ion capacitor comprising a positive electrode 1 made of a material capable of being reversibly doped with lithium ions and/or anions, a negative electrode 2 made of a material capable of being reversively doped with lithium ions, and an aprotic organic solution of a lithium salt as an electrolytic solution, wherein the positive electrode 1 and the negative electrode 2 are laminated or wound with a separator interposed between them, the area of the positive electrode 1 is smaller than the area of the negative electrode 2, and the face of the positive electrode 1 is substantially covered by the face of the negative electrode 2 when they are laminated or wound.

Abstract: To present a carbon material which provides an electrical storage device not only ensuring a high energy density but also realizing a high output and an excellent low temperature performance. A negative electrode active material for an electrical storage device employing an aprotic organic solvent electrolyte solution containing a lithium salt as an electrolytes characterized in that it is made of a carbon material having a specific surface area of from 0.01 to 50 m2/g and a total mesopore volume of from 0.005 to 1.0 cc/g, wherein volumes of mesopores having pore diameters of from 100 to 400 ? occupy at least 25% of the total mesopore volume.

Abstract: An organic electrolyte capacitor. The organic capacitor is made up of a positive electrode, a negative electrode, and an electrolyte capable of transporting lithium ions. The organic capacitor exhibits a small change in internal resistance during charge and discharge, a high energy and a high output power, and allows lithium ions to move with ease. This is achieved by having a positive electrode that is able to support lithium ions and anions reversibly, a negative electrode that is able to support lithium ions reversibly, and controlling the ratio of positive electrode active material to negative electrode active material within an optimized range.

Abstract: There is provided an organic electrolyte capacitor having electrodes on current collectors that have holes penetrating the front and rear surfaces, in which electrode materials formed on the through-holes of the current collectors seldom fall off and high energy density and high power density can be obtained. The organic electrolyte capacitor includes positive electrodes, negative electrodes and an electrolyte capable of transferring lithium ions, in which the positive electrodes contain a substance capable of carrying lithium ions and/or anions reversibly as a positive electrode active material, the negative electrodes contain a substance capable of carrying lithium ions as a negative electrode active material, the positive and negative electrodes possess the positive or negative electrode active material layers on an electrode substrate that has conductive layers made of conductive materials on current collectors, which have through-holes, and the negative electrodes carry lithium electrochemically.

Abstract: A lithium-ion capacitor excellent in durability, which has high energy density and high capacity retention ratio when the capacitor is charged and discharged at a high load, is disclosed. The lithium-ion capacitor includes a positive electrode, a negative electrode and an aprotic organic solvent of a lithium salt as an electrolyte solution. In the lithium-ion capacitor, a positive electrode active material allows lithium ions and/or anions to be doped thereinto and de-doped therefrom, and a negative electrode active material allows lithium ions to be doped thereinto and de-doped therefrom. At least one of the negative electrode and the positive electrode is pre-doped with lithium ions so that after the positive electrode and the negative electrode are shortcircuited, a potential of the positive electrode is 2 V (relative to Li/Li+) or lower. A thickness of a positive electrode layer of the positive electrode is within a range from 18 to 108 ?m.

Abstract: Discharge at a high current density has been difficult because of problems that an electrolytic solution has low conductivity and absorption and desorption reaction of lithium ions are slow in the negative electrode. However, let a (mAh) be a cell capacity when the organic electrolyte capacitor in a charged state is discharged to half the charging voltage over 1±0.25 hours, and b (mAh) be a negative electrode capacity when the negative electrode in the charged state is discharged to 1.5 V (Li/Li+), then, by controlling a ratio of a positive electrode active material and a negative electrode active material to satisfy 0.05?a/b?0.30, it is possible to achieve a high-performance organic electrolyte capacitor having a small internal resistance and a small change in internal resistance during charging and discharging as well a high output density, in which lithium ions are allowed to move with ease.