Toyota Jidosha Kabushiki Kaisha

Hiroyuki Kawaki

Seiichi Matsumoto

Shinya Kamada

Shinya Kuroki

Kazuhiro Uchida

Hisataka Fujimaki

Hisanao Kojima

Katsuyuki Hojo

Tomotaka Hagino

Kiyokazu Ito

Yasunori Toyoshima

Masayuki Kitamura

Takahiro Makihara

Provided is a method for producing a lithium secondary cell with which the concentrated precipitation of metal impurities at the negative electrode is inhibited and short circuiting is unlikely to occur. The production method includes, assembling together the positive electrode, the separator, and the negative electrode, and then impregnating the assembly with the nonaqueous electrolyte; charging the assembly within 1 min so that a maximum achieved potential of the positive electrode becomes 3.2 V or more with respect to the redox potential of lithium; allowing the assembly to stand for 10 min or less after the charging has ended; and discharging the assembly within 1 min after the standing step.

Method for producing lithium secondary cell

In an ultrasonic measuring method for measuring the thickness of a coating material applied by coating to one surface or both surfaces of a substrate made of a metal so as to provide a coated product, a pair of first ultrasonic sensor and second ultrasonic sensor are provided such that the first ultrasonic sensor is placed on one side of the coated product, as viewed in its thickness direction, via an air layer, while the second ultrasonic sensor is placed on the other side of the coated product, via an air layer, and the thickness of the coating material is measured by transmitting ultrasonic waves between the first and the second ultrasonic sensors. A flat-type transmitting sensor that permits propagation of unfocused ultrasonic waves is used as the first ultrasonic sensor, and a flat-type receiving sensor that permits propagation of unfocused ultrasonic waves is used as the second ultrasonic sensor.

Ultrasonic measuring method and ultrasonic measuring system

The objective of the present invention is to provide an unexpected detecting apparatus enabled to evaluate an evenness of a compound coated on an electrode of a battery. The detecting apparatus () detects an evenness of a compound () coated on an electrode () of a battery, and includes a first sensor () for measuring a mass per unit area of the compound () in any points thereof, a second sensor () for measuring a thickness of the compound () in the any points, and a holder () for holding the first and second sensors (), in which the first and second sensors () measure the mass and thickness at the same time, and the evenness is evaluated on the basis of the measured mass and thickness.

Detecting apparatus

An ultrasonic measuring method and an ultrasonic measuring system use or include at least one actual-measurement ultrasonic sensor set each consisting of a first ultrasonic sensor and a second ultrasonic sensor, for measuring the basis weight of an electrode paste, and a calibration ultrasonic sensor set consisting of a pair of first calibration ultrasonic sensor and second calibration ultrasonic sensor. The calibration ultrasonic sensor set performs calibration during measurement of the thickness of the electrode paste, and the actual-measurement ultrasonic sensor set calculates the basis weight of the electrode paste, using a measurement condition value obtained by the calibration ultrasonic sensor set.

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Toyota, Japan

Hiroyuki Kawaki