Nissan Motor Company Limited

Atsushi Horai

Eiji Minegishi

Takashi Mori

Hiroyuki Tanaka

Yasuhiko Ohsawa

Shinichi Takahashi

Hajime Satou

Yusuke Nakashima

Atsushi Ohma

Gentaro Kano

Tetsuya Mashio

Kazuki Arihara

Yusuke Emori

Ryoichi Senbokuya

Maki Chumon

The bipolar secondary battery includes a power generation element including unit power generation elements stacked together and including bipolar electrodes stacked via separators, and current collecting plates arranged at both ends of the power generation element in the stacked direction of the unit power generation elements so as to be in contact with the power generation element, wherein the current collecting plates each include an electrically conductive layer and a resin film, the electrically conductive layer being formed on the resin film having a thermal shrinkage percentage of 2% or greater at a temperature of 150&#xb0; C., and the separators have a higher thermal shrinkage start temperature than the resin films.

Bipolar secondary battery

A secondary battery is provided with a power generation element, an electroconductive member, an external short circuit, a current detector and an external discharge safety circuit. The power generation element has a unit cell layer that includes a positive electrode, a separator and a negative electrode stacked in that order. The electroconductive member is disposed on one outward side of the power generation element with an insulation member interposed therebetween. A lead wire connects the electroconductive member with the negative electrode tab. The current detector detects whether or not current is flowing to the lead wire. The external discharge safety circuit is provided to short-circuits a path between the positive electrode tab and the negative electrode tab outside the power generation element while current detector detects a current.

Secondary battery and secondary battery control method

A short circuit detection device has a voltage sensor and a control unit. The voltage sensor detects a voltage of a secondary battery. The control unit determines whether a first voltage value of the voltage of the secondary battery discharging to a load is below a threshold value. Upon determining the first voltage value is below the threshold value, the control unit adjusts the load to reduce the current that flows from the secondary battery to the load. The control unit then determines whether a second voltage value of the voltage of the secondary battery after the adjustment of the load is less than the first voltage value. Upon determining the second voltage value is less than the first voltage value, control unit recognizes that an internal short circuit of the secondary battery has occurred.

Short circuit detection device

A single cell C includes a membrane electrode assembly M in which an electrolyte membraneis interposed between a pair of electrode layers, and a pair of separatorsthat form gas channels C between the pair of separatorsand the membrane electrode assembly M, wherein the electrode layersinclude first gas diffusion layersB,B of a porous material disposed at the side facing the electrolyte membraneand second gas diffusion layersC,C that are composed of a metal porous body having arrayed many holes K, and a part of the first gas diffusion layersB,B penetrates the holes K of the second gas diffusion layersC,C to form protrusions T. Accordingly, the surface of the electrode layershas a fine uneven structure. As a result, an improvement in liquid water discharging function and an improvement in power generating function were achieved at the same time.

Fuel cell single cell

Growing community of inventors

Kanagawa, Japan

Atsushi Horai