Denso Corporation

Nippon Soken, Inc.

Daisuke Shibata

Shuhei Yoshida

Masaya Nakamura

Koji Ohira

Toshiatsu Nagaya

Masaki Uchiyama

Hiroyoshi Yamamoto

Masatoshi Ikeda

Yuta Shimonishi

Keita Takahashi

Kazuo Ikuta

Kouji Noda

A battery structure includes a plurality of batteries each made of lithium-ion secondary battery; and a plurality of arrangement portions in which the plurality of batteries are arranged. The plurality of arrangement portions are divided into two groups of: a upper heat transfer group having heat transfer orders higher than a center value of the heat transfer orders, where the heat transfer orders are respective amount of heat transfer from the batteries being ranked in descending order; and a lower heat transfer group having the heat transfer orders lower than the center value. A battery among the plurality of batteries showing the highest value of a lithium deposition tolerance which represents a degree of lithium being unlikely to deposit during charge/discharge operation, is disposed in a high tolerance arrangement portion in the plurality of arrangement portions, the high tolerance arrangement portion belonging to the upper heat transfer group.

Battery structure reducing lithium deposition

An electrode active material for a nonaqueous electrolyte secondary battery includes: a core part including at least one of an inorganic oxide and a carbon-composite inorganic composite oxide; and a shell part for carbon coating on the core part. The electrode active material has a specific surface area of 6.0 m/g or more. The electrode active material has a moisture content of 400 ppm or less, which is measured by a Karl Fischer method such that the electrode active material is heated in a heat-evaporating manner, and continuously maintained at 250&#xb0; C. for 40 minutes without exposing to an atmosphere after the electrode active material is exposed to the atmosphere to absorb moisture to be saturated.

Electrode active material for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

An electrode includes an electrode material, which includes: a core part made of an active substance having a polyanion structure having Mn; and a shell part obtained by covering a surface of the core part with carbon. In addition, an amount of water, as measured by Karl Fischer's method when the electrode is held at 250&#xb0; C. for 40 minutes after adsorbed water is volatilized by heating, is 1500 ppm or less.

Electrode and non-aqueous electrolyte secondary battery

An assembled battery includes a plurality of secondary cells, a first arithmetic operator, a second arithmetic operator, and a discharger. The first arithmetic operator calculates a voltage change rate of each of the secondary cells during charging/discharging thereof. The second arithmetic operator determines a discharge condition for each of the secondary cells from the voltage change rate calculated in the first arithmetic operator and a state of charge of each of the secondary cells. The discharger performs discharging of each of the secondary cells on the basis of the discharge condition when the assembled battery is neither being charged nor being discharged. The second arithmetic operator determines the discharge condition of each of the secondary cells such that each of the secondary cells after the discharging has the same state of charge.

Assembled battery

A battery includes a positive plate, a negative plate and an insulative separator disposed between the positive plate and the negative plate. Each of the positive plate and the negative plate has a collector and an electrode layer disposed on a surface of the collector. The electrode layer contains an active material. At least one of the positive plate and the negative plate has cracks in a whole area of the electrode layer thereof or at a part of the electrode layer thereof, the part being away from a connector of the one to be coupled to an electrode at least by a predetermined distance. For example, the cracks are formed by drying the electrode layer at a predetermined drying rate.

Battery, manufacturing method of the same, and manufacturing apparatus of the same

A multilayered piezoelectric element and a method of producing the multilayered piezoelectric element are disclosed. The multilayered piezoelectric element is made of piezoelectric ceramic layers and electrode formation layers which are alternately laminated. The piezoelectric ceramic layers are made of crystal oriented ceramic as polycrystalline material. The crystal oriented ceramic is made mainly of an isotropic perovskite type compound in which the specific {100} crystal plane of each of crystal grains that form the polycrystalline material is oriented. The electrode formation layers have electrode parts forming inner electrodes containing a conductive metal. The isotropic perovskite type compound is expressed by a general formula (1):[Ag{Li(KNa)}](NbTaSb)O&#x2003;&#x2003;(1),where 0&#x2266;x&#x2266;0.2, 0&#x2266;y&#x2266;1, 0&#x2266;z&#x2266;0.4, 0&#x2266;w&#x2266;0.2, x+z+w&#x3e;0, 0&#x3c;h&#x2266;0.05, 0.94&#x2266;j&#x2266;1, and 0&#x2266;k&#x2266;0.5).

Growing community of inventors

Tokai, Japan

Daisuke Shibata