Comment on Design of zinc bromide flow battery
perestroika@slrpnk.net 1 year ago
No experience on that front, sadly.
Compared to iron redox flow batteries, it has about 5 percentage points of more efficiency (75 vs. 70%), slightly better cell voltage (1.8 vs 1.2 V) and better energy density per electrode surface (0.2 W vs 0.05 W / cm2).
The “resetting” of cells seems like a nuisance. Quoting Wikipedia:
Every 1–4 cycles the terminals must be shorted across a low-impedance shunt while running the electrolyte pump, to fully remove zinc from battery plates.[3]
It’s probably doable, but not a particularly attractive technology when compared to alternatives.
Wondering why you feel that way? It would be easy to design packs of 4 that would have rotations where one cell does the resetting cycle while the others do the regular one? Is the reset cycle as long as the recharge one btw?
Rolive@discuss.tchncs.de 1 year ago
Hmm I didn’t notice the resetting part yet. That is indeed very inconvenient and not something I’m willing to build a system for.
Perhaps just individual cells is better in that sense. My goal is a set and forget style battery that only needs maintenance in a few months.