Cell frame, battery cell, cell stack, and redox flow battery

Abstract

A cell frame includes a bipolar plate and a frame body provided on an outer periphery of the bipolar plate. The bipolar plate includes, in a surface thereof, a groove portion through which an electrolyte supplied from an outside of the cell frame flows. The groove portion includes a liquid-holding portion that holds the electrolyte when the supply of the electrolyte from the outside is stopped. The frame body has an opening having a planar area of 250 cm2 or more. A total volume of a volume of a recess formed by the bipolar plate and an inner wall of the frame body and a total volume of the liquid-holding portion is 5 cm3 or more.

Dependencies are inferred from the claim text.