Nissan Motor Company Limited

Automotive Energy Supply Corporation

Koichi Takada

Yuta Motohashi

Provided is a method for manufacturing a film-wrapped electrical device, including: a first injection step of depressurizing, to a given pressure lower than atmospheric pressure, the inside of an injection chamber () in which a bag-shaped laminate film wrapping member () is placed, the laminate film wrapping member () having an opening portion () and housing an electrode assembly (') including a positive electrode and a negative electrode stacked with a separator therebetween, and injecting part of a predetermined injection amount of an electrolyte solution () into the wrapping member () through the opening portion (); and a second injection step of, after the first injection step, pressurizing the inside of the injection chamber () to a pressure higher than the given pressure and injecting the rest of the predetermined injection amount of the electrolyte solution ().

Method and device for manufacturing film-wrapped electrical device

A battery case is disposed in a decompression chamber. An electrolyte in an aeration tank is injected into the battery case in the decompression chamber using a liquid injection nozzle. By exposing the electrolyte to an ambient pressure in the decompression chamber within the aeration tank before supplying the electrolyte to the liquid injection nozzle, a pressure of the electrolyte is regulated to a pressure in the decompression chamber, and gas molecules in the electrolyte are separated therefrom. By providing the aeration tank, an efficiency with which the gas molecules are separated from the electrolyte is improved, and as a result, the electrolyte is injected into the battery case smoothly.

Growing community of inventors

Atsugi, Japan

Koichi Takada