Toyota Jidosha Kabushiki Kaisha

Katsuyuki Hojo

Hisataka Fujimaki

Hisanao Kojima

Naoki Kato

Kenji Miyasaka

Hiroaki Ikeda

Shigetsugu Iwata

Tomotaka Hagino

Hiroki Goshima

Shinya Kamada

Hiroyuki Kawaki

Yuichi Nishida

Hiroshi Mizoguchi

To melt and diffuse metallic foreign bodies immixed in electrodes of a nonaqueous electrolyte secondary battery before initial charging, electrodes wound with a separator between a cathode plate and an anode plate are placed in a battery case and the battery case is filled with an electrolyte. After the case has been filled, the electrolyte is allowed to permeate into the electrodes. Then, the electrolyte-filled battery is placed in a processing device, and fixed with a surface pressure between at least 0.1 MPa and 5.0 MPa. Thereafter, the cathode potential is adjusted and held for a period of one hour and 35 hours while the battery remains fixed, after which the pre-initial charging process is terminated.

Processing device of nonaqueous electrolyte secondary battery and manufacturing method thereof

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

A method of testing a secondary battery includes first to fourth steps. At the first step, the secondary battery after manufacture is charged to a first voltage. At the second step, a second voltage lower than the first voltage is set as a target voltage and discharge or charge is performed in a constant-current constant-voltage mode before the secondary battery is left standing. At the third step, the open circuit voltage of the secondary battery is measured before and after the secondary battery is left standing. At the fourth step, it is determined whether the secondary battery is a conforming item or not based on the difference in the open circuit voltage before and after the secondary battery is left standing.

Method of testing secondary battery

Provided is a device to sense battery internal state that can sense tiny elastic waves accompanying a reaction inside a battery and can accurately ascertain changes in battery internal state. The device () to sense the internal state of a battery () comprises restraining members () that apply compressive force to the battery (), a non-metallic plate () disposed between the battery () and a restraining member (), and multiple acoustic emission sensors () affixed to the non-metallic plate (). Compressive force is applied to the battery () by the restraining members (), elastic waves (W) generated in the battery () are sensed by the multiple acoustic emission sensors (), and the internal state of the battery () is sensed by analyzing the sensed elastic waves (W).

Device and method to sense battery internal state

A power transmission device that can have deformation in processing suppressed. A spiral gear as a rotation member includes a disk section extending radially outwards from a boss section. The disk section includes a through hole in slit form through laser processing.

Power transmission device and method of producing the same

A differential device includes a differential case which is supported in a housing so as to be rotatable around an axis of the housing by a conical roller bearing including plural conical rollers provided between an outer race and an inner race. In the differential device, a wave spring having a predetermined elastic force is provided between the outer race and the housing. Also, the differential device includes a stopper mechanism which stops movement of the outer race before the wave spring is completely contracted due to movement of the outer race in an axial direction.

Growing community of inventors

Toyota, Japan

Katsuyuki Hojo