Flow battery systems
Embodiments of the invention generally provide for flow battery cells and systems containing a plurality of flow battery cells, and methods for improving metal plating within the flow battery cell, such as by flowing and exposing the catholyte to various types of cathodes. In one embodiment, a flow battery cell is provided which includes a cathodic half cell and an anodic half cell separated by an electrolyte membrane, wherein the cathodic half cell contains a plurality of cathodic wires extending perpendicular or substantially perpendicular to and within the catholyte pathway and in contact with the catholyte, and each of the cathodic wires extends parallel or substantially parallel to each other. In some examples, the plurality of cathodic wires may have at least two arrays of cathodic wires, each array contains at least one row of cathodic wires, and each row extends along the catholyte pathway.
1. A flow battery cell, comprising:
a cathodic half cell comprising a planar cathode, a catholyte, a catholyte inlet, a catholyte outlet, a catholyte pathway extending between the catholyte inlet and outlet and within the cathodic half cell, and an open block flow screen within the catholyte pathway, wherein the open block flow screen contains a plurality of blocks comprising an electrically insulating material and a plurality of channels disposed throughout the electrically insulating material and between the blocks;
an anodic half cell comprising an anode in conductive contact with an anolyte;
an electrolyte membrane disposed between the cathodic half cell and the anodic half cell and in contact with the catholyte and anolyte; and
a cathodic contact electrically connected with the cathode and disposed outside of the cathodic half cell.
2. The flow battery cell of claim 1 , wherein the open block flow screen is in physical contact with the front facing surface of the planar cathode, and the open block flow screen extends from the catholyte inlet to the catholyte outlet and from the planar cathode to the electrolyte membrane.
3. The flow battery cell of claim 2 , wherein the channels of the open block flow screen occupy about 70% or more of the total volume of the open block flow screen.
4. The flow battery cell of claim 3 , wherein the channels have a diameter or a porosity within a range from about 10 μm to about 100 μm.
5. The flow battery cell of claim 3 , wherein the open block flow screen comprises a porous mat of woven fibers.
6. A flow battery cell, comprising:
a cathodic half cell comprising a catholyte, a catholyte inlet, a catholyte outlet, a catholyte pathway extending between the catholyte inlet and outlet and within the cathodic half cell, and a slotted sheet cathode in fluid communication with the catholyte pathway and extending perpendicular or substantially perpendicular to the catholyte pathway, wherein the slotted sheet cathode comprises a plurality of cathodic strips separated by slots disposed through a metallic sheet;
an anodic half cell comprising an anode in conductive contact with an anolyte;
an electrolyte membrane disposed between the cathodic half cell and the anodic half cell and in contact with the catholyte and anolyte; and
a cathodic contact electrically connected with the slotted sheet cathode and disposed outside of the cathodic half cell.
7. The flow battery cell of claim 6 , wherein each cathodic strip has a thickness within a range from about 0.01 inch to about 0.05 inch and a length within a range from about 5 cm to about 300 cm.