Method and device for manufacturing film-wrapped electrical device

A method for manufacturing a film-wrapped electrical device, comprising:

• a first injection step of
• depressurizing, to a given pressure lower than atmospheric pressure, an 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 laminate film 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 lower than an average value of the given pressure and atmospheric pressure, and injecting the rest of the predetermined injection amount of the electrolyte solution into the laminate film wrapping member through the opening portion, wherein
• in each of the first injection step and the second injection step, the solution is injected in installments,
• a total injection amount in the first injection step is set larger than a total injection amount in the second injection step, and
• a number of installments in the first injection step is set larger than a number of installments in the second injection step.