| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent a spout of an electrolyte from a case via a small- diameter filling hole, when the case is forcibly supplied with a large volume of the electrolyte in a short time and then a filling nozzle is removed. SOLUTION: This method for filling a case with an electrolyte from a small-diameter hole involves the processes where the open part of a case 1 having an electrode group 4 inserted is closed with a sealing plate 15 having a small-diameter filling hole 2, the outer side of the small-diameter filling hole 2 is sealed with an airtight chamber 14, and a nozzle 9 in the airtight chamber 14 is connected to the small-diameter hole 2 for forcibly feeding the case 1 with a pressurized electrode 3 from the nozzle 9. In this case, the pressing force of the airtight chamber 14 is kept almost equal to the internal pressure of the case 1 with the forcibly fed electrolyte 3, or higher than the internal pressure of the case 1. In this state, the nozzle 9 is detached from the small-diameter filling hole 2 and the pressing force of the airtight chamber 14 is used to prevent a spout of the forcibly supplied electrolyte 3 from the small-diameter filling hole 2. Thereafter, a condition is maintained for preventing a spout of the electrolyte 3 from the small-diameter filling hole 2 and, then, the airtight chamber 14 is released to the atmospheric pressure. |
