Power Seminars

Hybrid energy storage system of batteries and double layer capacitors (EDLC) System analysis, circuit topologies and practical implementation in a digitally controlled system for the low-voltage range.


One of the sticking points in Electro mobility as well as in Renewable Energies is the energy storage. Lithium-ion batteries are at that time the most interesting option among the storage technologies. Battery powered tools or other highly reliable battery powered systems are typical applications where the life span and the robustness play a significant role.

But with progressive technological development double layer capacitors (EDLC, depending on manufacturer also ultra-capacitors, super-capacitors also named green cap) are more and more often advisable for battery replacement.

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To this further development belongs the expansion of their temperature range to 85°C considering of the voltage derating, a higher voltage of 2,85V – in near future maybe even up to 3V – as well as more capacity at constant frame size due to adjustments to the electrode, the usage of another electrolytes and the better exhaustion of reserves.

All of this leads to a higher and higher energy density, which is several hundred times bigger than in conventional capacitors. As the sole energy storage, they are advisable for approximately hybrid busses, forklifts, cranes, driverless transport systems as well as automatic engine start-stop control, flashlights, pitch systems and so on …


Hybrid Energy Storage System Benefits

In the combination (battery + double layer capacitors) as hybrid energy storage system in combination with bidirectional energy transfer between the energy storage arise almost perfect system properties, for example

  • Higher charging and discharging currents 
  • Grand cycle resistance
  • Large working temperature range
  • Long life span
  • Balanced power management

In the Electro mobility the capacitors adopt the huge power spikes during acceleration and braking. Thus they reach maximum recuperation grade during active braking of the engine and improve the total efficiency obviously. Additionally the accumulators feature less charge cycles and accordingly much less and small current peaks, thus they reach a considerably higher life span. This applies to all systems with bidirectional energy transfers. Thanks to this attributes the EDLCs note for years growth rates in the double-digit range.

The lecture analyses all known circuit topologies of DC/DC – transformers in hybrid energy storage systems and leads after the best practice method to practicable and economic solving approaches.

In collaboration with the West Saxon College Zwickau is in connection of the lecture a demonstrator of a hybrid energy storage system for low-voltage applications shown.

 

 

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