Battery state of charge indicator system.

摘要

An electric storage battery having a container (22) and a cover (23), and having a plurality of walls for enclosing the electrolyte and other electrochemical components of the battery, has a state of charge indicating device for monitoring the concentration of the electrolyte during the charge and discharge cycles of the battery. The indicating device is made of a porous solid support (31) and an acid concentration sensitive dye which exhibits a change in colour in accordance with the acid concentration of the electrolyte. The indicating device also includes a viewport located in one of the walls of the battery for viewing the colour of the dye. The colour may then be correlated to a reference scale to determine the state of charge of the battery.