Power Storage Solutions
When will the new storage battery be here?
Hydrogen and Redox-Flow
While the redox-flow battery can pick up the current spike of a few hours, the electrolysis can be used as a basis of all currently discussed power-to-gas concepts in such a way as to store regenerative power in greater quantities and for a longer time in the form of chemical energy—as hydrogen or synthetic natural gas that is stored in salt domes or added to conventional natural gas in pipes. Redox-flow batteries based on vanadium present three advantages as compared to conventional battery technologies. I
n split seconds they can switch from being in a stored form to being discharged and thereby react in a few seconds to the particular supply situation. The efficiency is 80 percent and the amount of electricity to be stored is only limited by the load capacity of the storage tank.
But the large-scale technical deployment has failed so far due to the lacking performance of the commercially available batteries that is currently 20 watt – completely insufficient for a large-scale technical deployment. One must however think in a completely different direction for a large-scale technical deployment.
The target of Thyssen Krupp Industrial Solutions is 20 megawatt power. For this, the previously existing cell area of 0.1 square meters must be expanded to more than 30 times. This sounds easier than it is. If particularly only the active cell area is increased and the pressure of the electrolyte solutions is dropped, the electrical flow will not pass through the cell completely and thus will not generate additional power.
The process engineers from Essen are tackling this problem now with a new cell design that currently passes the endurance test of continuous load at the new test station in Ennigerloh. The technology should be in the market in 2016.