Connections for redox battery integration
A redox battery comprises a plurality of redox battery cells stacked in a stacking direction, wherein each of the redox battery cells comprises a first half cell connected to a positive current collector, a second half cell connected to a negative current collector and an ion exchange membrane separating the first and second half cells. The redox battery additionally comprises a positive conducting bus bar extending in the stacking direction and electrically connecting the positive current collectors of the redox battery cells in parallel, and a negative conducting bus bar extending in the stacking direction and electrically connecting the negative current collectors of the redox battery cells in parallel. One or both of the positive and negative bus bars are configured as fastening means for mechanically fastening the stacked redox battery cells in the stacking direction.
1 . A redox battery comprising:
a plurality of redox battery cells stacked in a stacking direction, wherein each of the redox battery cells comprises a first half cell connected to a positive current collector, a second half cell connected to a negative current collector and an ion exchange membrane separating the first and second half cells;
a positive conducting bus bar extending in the stacking direction and electrically connecting the positive current collectors of the redox battery cells in parallel;
a negative conducting bus bar extending in the stacking direction and electrically connecting the negative current collectors of the redox battery cells in parallel;
a first positive end plate and a second positive end plate disposed at opposing ends of the stacked redox battery cells, wherein the first and second positive end plates are connected to the positive conducting bus bar; and
a first negative end plate and a second negative end plate disposed at opposing ends of the stacked redox battery cells, wherein the first and second negative end plates are connected to the negative conducting bus bar.
2 . The redox battery of claim 1 , wherein the first and second positive end plates are electrically conductive to the positive conducting bus bar, and wherein the first and second negative end plates are electrically conductive to the negative conducting bus bar.
3 . The redox battery of claim 1 , wherein the first positive and first negative end plates are electrically insulated from each other and adjacently disposed on a same end of the stacked redox battery cells.
4 . The redox battery of claim 1 , wherein the second positive and second negative end plates are electrically insulated from each other and adjacently disposed on a same end of the stacked redox battery cells.
5 . The redox battery of claim 1 , wherein the positive conducting bus bar is mechanically fixed to both first positive and second positive end plates.
6 . The redox battery of claim 1 , wherein the negative conducting bus bar is mechanically fixed to both first negative and second negative end plates.
7 . The redox battery of claim 1 , wherein the positive and negative conducting bus bars are mechanically fixed to first positive and second positive end plates and first negative and second negative end plates, respectively, using one or more mechanical coupling structures.
8 . The redox battery of claim 1 , further comprising a tie band forming a loop around the stack of redox battery cells.
9 . The redox battery of claim 1 , wherein an insulating layer is interposed between the stack of redox battery cells and one or both of positive and negative end plates.
10 . The redox battery of claim 1 , wherein the first positive end plate and the first negative end plate form a pair of adjacently disposed end plates having opposite polarities that are disposed on a same end of a same redox battery cell stack.
11 . The redox battery of claim 1 , further comprising:
a second positive conducting bus bar extending in the stacking direction and electrically connecting the positive current collectors of the redox battery cells in parallel; and
a second negative conducting bus bar extending in the stacking direction and electrically connecting the negative current collectors of the redox battery cells in parallel.
12 . The redox battery of claim 11 , wherein the positive and negative conducting bus bars are disposed on an opposing side of the stack of redox battery cells to the second positive bus bar and the second negative conducting bus bar, respectively.
13 . The redox battery of claim 1 , wherein one or both of the positive and negative conducting bus bars serve as a fastener to compress the redox battery cells stacked along the stacking direction.
14 . The redox battery of claim 13 , wherein the redox battery does not include an additional fastener providing a further compressive force compressing the stacked redox battery cells along the stacking direction.
15 . The redox battery of claim 1 , further comprising an fastener forming a loop around the stacked redox battery cells and the first and second positive and negative end plates.