Diagnosis & Modelling

Li-Ion batteries require a battery management system (BMS) for proper operation. This system assumes basic functions such as cell balancing, charge and aging state calculation, as well as all safety-related tasks to ensure the secure and optimal operation of the whole battery or individual cells. Furthermore, the BMS can optionally feature communication interfaces for integration into the application. We develop hardware and the software solutions for such battery management systems. In this respect, we rely on our own BMS, which has been continually developed since 2003, to consistently meet or exceed the leading technologies in the field.

We also offer algorithm development for lead-acid batteries. While individual cell monitoring is generally irrelevant in this case, state detection is of paramount importance. Nowadays, numerous vehicles rely on sensors placed on the negative pole of their main battery to capture variables such as charge and aging state, as well as to guarantee the expected starting capability, load acceptance and performance. This information is needed to optimise the operating strategy.

Further to state detection, we also prepare or execute simulations for lead and Li-ion batteries. In this area, we distinguish between spatially-resolved models, which depict individual processes (such as diffusion) inside cells, and impedance-based models. In this option, we design a suitably equivalent circuit diagram of the battery, and program the same via measurement. We simulate thus the electrical behaviour of the cell or battery. What is more, we can also develop aging models, which help determine internal resistance increases and capacity reductions.

Ersatzschaltbild einer Zelle als Grundgerüst für die Simulation

Equivalent circuit diagram of a cell as a basic simulation structure

Kundenspezifisches BMS

Custom battery management system with display and control unit