Patent ID: 8343240

Claim:
A manufacturing method for a film-covered electrical device, comprising: holding, in a vacuum container, a bag-shaped laminate film that contains a power generating element and that has an opening, by pinching the bag-shaped laminate film at positions corresponding to two principal surfaces of the power generating element, the power generating element having a positive layer and a negative layer stacked via a separator; reducing pressure in the vacuum container; pouring an electrolytic solution into the bag-shaped laminate film through the opening with the pressure in the vacuum container kept reduced until the level of the electrolytic solution becomes higher than the top end of the power generating element; and increasing the reduced pressure in the vacuum container, wherein the electrolytic solution is poured under conditions given by: 0<2 V W +V L <V TOTAL 0 <V W , 0 <V L where L and W are length and width of the power generating element; V L is a volume formed between the laminate film and an edge surface at a bottom opposite to an edge surface located at the opening from among the edge surfaces of the power generating element; V W is a volume formed between the laminate film and an edge surface, which joins the edge surface at the bottom and the edge surface at the opening from among the edge surfaces of the power generating element; and V TOTAL is a total volume of the electrolytic solution poured into the bag-shaped laminate film.