Integrated electrolyte rebalancing with flow battery power modules

A method of operating a redox flow battery system, comprising:

• flowing negative electrolyte from an electrolyte storage tank through a negative inlet flange of a battery stack;
• flowing the negative electrolyte through the battery stack and contacting internal components of the battery stack;
• contacting the negative electrolyte with an internal rebalancing reactor;
• and
• flowing the negative electrolyte through a negative outlet flange of the battery stack.

A battery stack, comprising:

• a plurality of redox flow battery cells;
• a first pressure plate positioned at a first end of the battery stack and a second pressure plate positioned at a second end of the battery stack, the plurality of redox flow battery cells positioned between the plurality of redox flow battery cells;
• a first negative outlet flange protruding from the first pressure plate and a second negative outlet flange protruding from the second pressure plate, the first negative outlet flange and second negative outlet flange fluidly coupled to the plurality of redox flow battery cells;
• an internal rebalancing reactor including a first end and a second end and circumferentially surrounded at the first end by the first negative outlet flange and circumferentially surround at the second end by the second negative outlet flange and configured to receive negative electrolyte from the plurality of redox flow battery cells.