PRESSURE CHANGE PREVENTING TANK STRUCTURE, ELECTROLYSIS LIQUID CIRCULATION TYPE SECONDARY BATTERY, AND REDOX FLOW TYPE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a simple pressure change preventing tank structure, in which the pressure change of its gaseous phase part resulting from a temperature change can be prevented, without bring a storage liquid into contact with air. SOLUTION: This pressure change preventing structure is arranged with a breathing bag 3 which is arranged in a gaseous phase part 2 of the tank 1, and expands or shrinks upon making contacting with the external air, and, including through-holes 22, by which the respiratory bag contacts with the external air, a manhole 21 attached so that the breathing bag may be hung into the gaseous phase part. The breathing bag 3 has air shutoff property, acid resistance, and freely expanding and contracting nature.