The vehicle battery is of particular importance when making a purchase decision for an electric car. Potential buyers and car owners need to know what condition the battery is in and what total capacity it (still) has at all times. An objective and comparable assessment of the state of health (SoH) of vehicle batteries can strengthen the confidence in electromobility and increase acceptance of electromobility sustainably and persistently. In a catalogue of requirements, the TÜV Association formulates which data is necessary to be able to determine the SoH reliably.
The vehicle battery is the most expensive component of electric vehicles. In particular, vehicle owners must be able to rely on the information regarding battery quality, remaining battery capacity and the associated range. This also means that when vehicle batteries have fallen below the capacity where they no longer meet the everyday needs of a private customer and are on the threshold of second life use, it must be possible to determine a valid SoH that ensures the battery still meets the requirements for use in buffer storage systems, for example. In the course of second life use, certain data must be known about the condition of the former traction battery, because the entire system must be re-examined in the event of a change of use. Going forward, there must therefore be a reliable determination of a SoH, for any use of a battery.
The product "battery" must be assessable over its entire life cycle in order to be of maximum economic and ecological benefit. To date, however, there are no reliable, manufacturer-independent benchmarks for evaluating the SoH. For the battery assessment or the determination of the battery condition, there is a need for concrete requirements in the handling of the battery management system (BMS) data and their interpretation. To this end, the TÜV Association has defined minimum requirements as to which data would have to be made available by the vehicle manufacturer on a non-discriminatory basis so that a SoH can be reliably determined.
Die Zentralen Forderungen des TÜV-Verbands
- Non-discriminatory access to vehicle data
- Enable data sharing as early as possible in the life cycle of the vehicle
- Link carbon footprint to the number of cycles of a battery