Editor’s note: A viable, fast reacting and large power storage unit will solve the variability problem of wind generated power.
Using energy efficiently is a cornerstone of the energy transition, but doing so in industry can be difficult due to unfulfilled technical requirements. For example, there are no suitable storage systems. To solve this problem, research institutes and industrial companies are working together on the project “FastStorageBW II” to develop the next-generation energy storage system for industry.
“The goal is to create a hybrid that combines the advantages of batteries and capacitors,” explains Dr. Olaf Wollersheim at the Karlsruhe Institute of Technology. Wollersheim directs the project Competence E, which researches the economically relevant aspects of everything from battery materials to electrical storage systems and develops, builds and tests storage prototypes.
The combination of both systems, named Powercaps, uses the advantages and avoids the disadvantages: a battery can absorb a lot of energy and save it for a long time, but it takes a long time to charge, has a limited lifespan and withstands only a limited number of charge cycles. A capacitor, on the other hand, absorbs energy quickly and is durable, but does not have the storage capacity and endurance of a battery.
“The market potential for hybrid cells is enormous. It already amounts to roughly half a billion euros, and in four to six years it could reach two or three billion euros,” says Edward Pytlik, who manages the R&D department at Varta Microbattery GmbH. The company managed to derive the new Powercaps from lithium-ion batteries, albeit with an aqueous electrolyte system. This averts the danger of combustion, which until now was an important argument for barring conventional lithium-ion batteries from many industrial sectors.
The new electrochemical storage units are able to effectively buffer peak loads in factories. “Quite often cables, transformers and electronics are set for a peak load of, for example, 300 kilowatts, although on average only three kilowatts are needed. With the new Powercaps the peak value can be limited to ten kilowatts, which enables tremendous cost savings,” calculates Wollersheim. Two intralogistics companies that already contribute to FastStorageBW II will be the first to use the prototypes.
Powercaps can be applied in all areas where power demand fluctuates. Potential uses include peak-load buffering in companies with high power demand, uninterruptible power supply and frequency control in power grids.
Powercaps expand the science of energy storage cells and can markedly help equalize supply fluctuations in the renewable energy sector. See KIT’s FastStorageBW II display (Hall 2, Stand B16) at the Research & Technology showcase at HANNOVER MESSE 2016.
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