Second use of batteries

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Test facility in the Vattenfall information pavilion in Hamburg

Under the secondary use of batteries (also Engl .: Battery 2nd Life ), the re-use of used batteries of electric cars in stationary systems for storing electrical energy called before their constituents within the battery recycling material recycled are. This second use is expected to result in lower overall investment costs for the batteries.

technology

Influencing variables such as the operating temperature, the number of charge / discharge cycles and the level of the charge / discharge currents lead to a continuous decrease in the storable electrical energy (so-called degradation) in accumulators. In the electric car , this leads to a corresponding reduction in its range; the accumulator must be replaced after a limit value has been exceeded (e.g. 80% of the nominal capacity). In contrast to mobile use in electric cars, stationary energy storage devices , such as those used in the use of renewable energies such as B. wind power or photovoltaic systems can be used to buffer temporary energy surpluses, the energy that can be stored in an accumulator with a given volume and mass only plays a subordinate role, which is why the use of used batteries from electric cars is recommended for economic reasons.

realization

Examples of the first pilot plants are the plant of Daimler AG in Luenen with used batteries from smart - and Mercedes - electric cars , the plant of Vattenfall in Hamburg with the batteries of the decommissioned BMW ActiveE pilot fleets or the battery farm in the BMW plant in Leipzig , in new of and used BMW i3 batteries are used as buffers for four wind turbines.

Compared to established technologies such as pumped storage power plants , the storage capacity of Battery 2nd Life systems has so far been low: While the world's largest test system as of the beginning of 2018, the above. Conditioning of Daimler AG in Luenen , a capacity of 13  MWh having such features. For example, the Goldisthal pumped storage plant has a storage capacity of over 8,000 MWh.

Individual evidence

  1. ↑ Michael Sterner , Ingo Stadler (Ed.): Energy storage. Need, technologies, integration. 2nd Edition. Berlin / Heidelberg 2017, p. 45f.
  2. ^ Melissa Bowler: Battery Second Use: A Framework for Evaluating the Combination of Two Value Chains . Clemson University May 2014 ( clemson.edu [accessed March 16, 2018]).
  3. ↑ a b The world's largest 2nd-use battery storage system goes online | marsMediaSite. Retrieved March 3, 2018 (German).
  4. ↑ A second life for used batteries - Vattenfall. Retrieved March 3, 2018 (German).
  5. ↑ Michael Specht: Battery recycling: The second life after the electric car . In: The time . November 4, 2016, ISSN  0044-2070 ( zeit.de [accessed March 3, 2018]).