By definition, hybrid drive systems consist of two drive components and two energy storages. In our case, one of the energy stores is a battery, but its capacity can be significantly smaller than with purely battery-electric solutions. Depending on the application, so-called supercapacitors can also be used. In hybrid topology, we distinguish between serial and parallel hybrids. In a parallel hybrid, an internal combustion engine and an electric motor are mechanically coupled to perform the drive tasks. In a serial hybrid, an internal combustion engine with an electrical generator is used to generate electrical energy, while the entire vehicle is then powered electrically.
Hybrid drive solutions have a clear advantage when purely battery-electric solutions are still economically justifiable but do not provide the required range in terms of kilometers or working hours.
Parallel hybrids require overall minor modifications to the vehicle compared to pure combustion engine solutions. In addition, depending on the system design, these also offer the advantage of increased redundancy. Depending on the application, this can be a key factor.
Serial hybrids tend to have better overall efficiencies than parallel hybrids but require fully electrified drives for propulsion, traction, and functional drives. Due to our multi-energy concept, it is relatively easy to develop serial hybrids further into hydrogen-based solutions in a later step.
In addition to charging the built-in battery in the hybrid vehicle via the internal combustion engine, a possible charging function from the public power grid can also be added as an option.