HESS combines the advantages of lithium-ion batteries with those of supercapacitors. During the operation of conventional battery-powered industrial systems, high-frequency current changes with very high current amplitudes constantly occur during highly dynamic, complex loads (e.g. inductive loads). This short-term energy is provided or absorbed by highly dynamic (un)charging of supercaps. A patented circuit has been developed in collaboration with the West Saxon University of Applied Sciences in Zwickau that detects the rate of current rise and the direction of current to control the MOSFET switches in the nanosecond range and then switches the MOSFETs in the microsecond range. Exemplary markets include the automotive and industrial sectors, e.g. cargo bikes, micro-mobility, city buses, and professional power tools.
The advantages of the HESS:
- Nominal load current handling by the battery, peak current supplier by the supercap
- Doubling of the battery service life
- Optimum balance of energy density, power density, capacity, costs, weight, and volume of the storage system
- Ultra-fast optimized control loop for energy storage control without latency of the microcontroller
- Avoidance of cross-conduction of the MOSFETs through external latching logic outside the MCU