To reduce leakage of electrolyte, and stabilize operation by arranging a suction port in a vacuum connecting chamber, opening a vacuum connecting chamber opening-closing valve part, and connecting the vaccum connecting chamber to a vacuum chamber under a condition where an electrolyte housing chamber opening-closing valve part is closed.
A battery case 1 is provided with a vacuum connecting chamber 40, a battery connecting port 7c penetrating through a wall of the connecting chamber 40 and an annular close contact part 13 to bring an opening edge part of the battery case 1 into close contact with the periphery of an outside end part of the connecting port 7c. A suction port 16 of the vacuum connecting chamber 40 connects the connecting chamber 40 to a vacuum device. A battery case opening part installing member 7a and a fixing member 7d also serving as support of a valve device 8 are connected to each other by a screw. In the connecting chamber 40, a recessed part is formed in the member 7a, and the connecting port 7c is communicated with its bottom part. Then, when it is used, the suction port 16 of the connecting chamber 40 is formed so as to be opposed to a side surface of a valve part 41 under a condition where the valve part 4-closed since a required process is only to open it in the connecting chamber 40 under a condition where the vacuum connecting chamber opening-closing valve part 41 is opened. In this condition, the connecting chamber 40 is connected to a vacuum chamber.
WADASAKI KATSUHISA
ICHINOSE HIROAKI
IGA YOSHITERU
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