Internally manifolded flow cell for an all-iron hybrid flow battery
In one example, a system for a flow cell for a flow battery, comprising: a first flow field; and a polymeric frame, comprising: a top face; a bottom face, opposite the top face; a first side; a second side, opposite the first side; a first electrolyte inlet located on the top face and the first side of the polymeric frame; a first electrolyte outlet located on the top face and the second side of the polymeric frame; a first electrolyte inlet flow path located within the polymeric frame and coupled to the first electrolyte inlet; and a first electrolyte outlet flow path located within the polymeric frame and coupled to the first electrolyte outlet. In this way, shunt currents may be minimized by increasing the length and/or reducing the cross-sectional area of the electrolyte inlet and electrolyte outlet flow paths.
1. A system for a flow cell stack for a flow battery, comprising a first flow battery cell, the first flow battery cell including:
a first flow field; and
a polymeric frame, comprising:
a top face,
a bottom face, opposite the top face,
a first side,
a second side, opposite the first side,
a first electrolyte inlet located on the top face and the first side of the polymeric frame,
a first electrolyte outlet located on the top face and the second side of the polymeric frame,
a first electrolyte inlet flow path located within the polymeric frame and coupled to the first electrolyte inlet, and
a first electrolyte outlet flow path located within the polymeric frame and coupled to the first electrolyte outlet,
wherein the first electrolyte inlet flow path includes one or more electrolyte inlet flow channels, and the first electrolyte outlet flow path includes one or more electrolyte outlet flow channels, and
wherein a perimeter of the inlet flow channel is minimized while a cross-sectional area of the inlet flow channel is maximized so as to reduce a pumping loss of the inlet flow channel.
2. The system of claim 1 , wherein the polymeric frame further comprises:
a first inlet flow manifold located within the polymeric frame and coupled between the first electrolyte inlet flow path and the first flow field; and
a first outlet flow manifold located within the polymeric frame and coupled between the first electrolyte outlet flow path and the first flow field.
3. The system of claim 1 , further comprising:
a second flow field;
and wherein the polymeric frame further comprises:
a second electrolyte inlet located on the bottom face and the first side of the polymeric frame;
a second electrolyte outlet located on the bottom face and the second side of the polymeric frame;
a second electrolyte inlet flow path located within the polymeric frame and coupled to the first electrolyte inlet; and
a second electrolyte outlet flow path located within the polymeric frame and coupled to the first electrolyte outlet.
4. The system of claim 2 , wherein the one or more electrolyte inlet flow channels and one or more electrolyte outlet flow channels have a cross section in a shape of a half-circle or within 10° of a half-circle.
5. The system of claim 4 , wherein a depth of the one or more electrolyte inlet flow channels is twice a width of the one or more electrolyte inlet flow channels and wherein a depth of the one or more electrolyte outlet flow channels is twice a width of the one or more electrolyte outlet flow channels.