Cheap energy storage may cause breakthrough in local renewables

| 8 October 2016 | Category: News, Practices

energy storage A new type of batteries based on the Hydrogen Bromide Flow Battery principle enables scalable, cost-effective use of energy storage in a large variety of applications.

The heart of a Hydrogen Bromide Flow Battery is the cell stack. This cell stack is on one side connected to an electrolyte fluid circuit (a water-based solution of bromine and hydrogen bromide, Br2/HBr), and on the other side to a Hydrogen (H2) gas circuit. Both the Br2/HBr and H2 circulate through their side of the cell stack, each in a closed loop. In each cell, the Br2/HBr and H2 circuits are separated by a proton-conductive membrane.

One of the unique features of HBr flow batteries is that, unlike for example Li-ion batteries, the total stored energy and the power of the storage system are de-coupled : The number of cells in the stack determines the electrical power [kW] of the storage system, while the volumes of the electrolyte and H2 tanks determine the total amount of stored electrical energy [kWh].

In other words, HBr based storage systems can be designed while independently dimensioning the electrical power and the stored energy. This implies that HBr technology allows scalability of power and energy in a very cost-effective way, at a cost of as low as € 0,05 per kWh. With this cost-level, the Elestor HBr storage system has become the new benchmark in electricity storage technology. It may help a major jump in local storage of renewable energy.

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Category: News, Practices