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Battery Cell Testing

Battery Cell Testing

Zinc Bromide Test Cell

A Zinc Bromide Test Cell

Basic Function of Zinc Bromine Flow Cells

The Zinc Bromine battery is a so called flow battery. Electrolyte is stored externally in tanks and pumped through the cell as required.

Charging:
-An external potential is applied to electrodes.
-Ionic zinc is reduced and deposits on the anode.
-Bromide is oxidised to bromine and complexed by quaternary ammonium salts.
-The complex is flushed out of the cell and separates due to higher density at the bottom of the catholyte tank.
Discharge:
-Electrodes are electrically connected and bromine complex is flushed into the cell.
-Bromine is reduced on the cathode to bromide.
-Zinc is oxidised at the anode and the deposit is gradually dissolved.
-The process is thermodynamically driven and electrical energy is released.

Assembly of the Zinc Bromide flow cell

Above - Cell assembly left to right: Complete cell assembly; cross section; flow profile. Below - Exploded view middle to outside: Membrane; frames with flow field and distance grids; electrodes; O-rings; housing and lid; liquid connectors and mounting bolts.

Voltage Cycle

Voltage and current during the charge and discharge cycle of a Zinc Bromine flow cell.