Nissan Motor Company Limited

Yusuke Emori

Tomohiro Kaburagi

Kazuyuki Yoda

Eiji Minegishi

Hajime Satou

Yusuke Mizuno

Yuichiro Yokoyama

Takuya Sakurai

Masanori Shimada

Hideaki Horie

Takashi Mori

Yasuhiko Ohsawa

Hiroshi Akama

Yuki Kusachi

Yusuke Nakashima

Gentaro Kano

Kazuki Arihara

Kenichi Toyoshima

Noboru Yamauchi

Atsushi Horai

Tooru Kosemura

Shigeo Watanabe

Takahiro Imaishi

Hideki Ishitani

Koh Hatanaka

A battery manufacturing method includes forming a unit cell having a positive electrode that is obtained by a positive electrode active material layer containing an electrolytic solution being disposed on a positive electrode current collector, a negative electrode that is obtained by a negative electrode active material layer containing an electrolytic solution being disposed on a negative electrode current collector, and a separator interposed between the positive electrode and the negative electrode. The battery manufacturing method further includes applying pressure to one unit cell or with two or more stacked unit cells from the stacking direction, and charging the one unit cell or the two or more stacked unit cells after applying of the pressure. The method is performed such that the positive electrode and the negative electrode are formed without an application film being subjected to a drying process performed through heating.

Battery manufacturing method

A battery manufacturing method includes forming a unit cell having a positive electrode that is obtained by a positive electrode active material layer containing an electrolytic solution being disposed on a positive electrode current collector, a negative electrode that is obtained by a negative electrode active material layer containing an electrolytic solution being disposed on a negative electrode current collector, and a separator interposed between the positive and negative electrodes. Heat sealing a seal part that is disposed at an outer peripheral portion of the unit cell. Cooling the outer peripheral portion of the unit cell by using a cooling medium after carrying out the heat sealing of the seal part. The method is performed such that the positive electrode and the negative electrode are formed without an application film being subjected to a drying process performed through heating.

A method for manufacturing a battery has a stacking step in which a plurality of unit cells are stacked, the unit cells being such that a positive electrode obtained by a positive electrode active material layer containing an electrolytic solution disposed on a positive electrode current collector, and a negative electrode obtained by a negative electrode active material layer containing an electrolytic solution disposed on a negative electrode current collector with a separator interposed therebetween. In the stacking step, each time one of the unit cells is stacked, the stack of the unit cells are pressed from the stacking direction.

The battery pack has a laminated body in which unit cells are laminated one on another, a cell case having a first opening and containing the laminated body, and a first lid member to tightly close the first opening. The first opening is positioned to face, in connection with a unit cell laminated direction, a first face of the laminated body. The first lid member is configured to, if an internal pressure of the cell case is lower than atmospheric pressure, deform while keeping the tightly closing state, come into contact with the first face of the laminated body, and apply a pressure based on a differential pressure between atmospheric pressure and the internal pressure of the cell case to the contacting face.

Battery pack

Provided is a means capable of improving the flatness of a surface of an electrode active material layer in which an electrode active material slurry without assuming addition of a binder. Upon producing a battery electrode which has a current collector and an electrode active material layer disposed on a surface of the current collector and containing an electrode active material, in a coating step of coating an electrode active material slurry in which the electrode active material is dispersed in a solvent on the surface of the current collector to form the electrode active material layer, an electrode active material slurry which has flow characteristics that a region A in which a shear stress is not increased according to an increase in shear rate is present and a region B in which a shear stress is increased and an increase rate thereof is decreased according to an increase in shear rate is present in a region having a shear rate larger than that of the region A, in a shear rate (horizontal axis)-shear stress (vertical axis) curve of the electrode active material slurry, is used as the electrode active material slurry, and, coating of the electrode active material slurry is performed at a coating rate at which the shear rate at the time of coating is a value in which a shear stress equal to or more than a yield stress of the electrode active material slurry is applied in the coating step.

Method for producing battery electrode

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

Growing community of inventors

Kyoto, Japan

Yusuke Emori