Karen Kutzner, managing director for finance and controlling at Volkswagen Sachsen: “Reusing batteries is important for the future and it’s closely linked to the acceleration in the trend toward electric mobility. With the power storage container, Volkswagen Sachsen is demonstrating a practical, cost-effective and useful case to enable cell modules at the end of their service lives to have a second life. This automotive power bank could be used wherever the capacity of the grid connection is too low but there is demand for powerful charging infrastructure. Innovative ideas like this could provide renewed impetus for the critical buildup of fast-charging infrastructure.”
As a large battery storage unit, the PSC offers a cost-effective alternative to a transformer station. It enables large quantities of energy to be provided in a short time without overburdening the electricity grid. Another advantage is that the temporary storage of energy allows for high basic costs that would otherwise be incurred during standby operation, even when no vehicles are charging, to be avoided. The automotive power bank could therefore enable HPC infrastructure to be built in the future where previously only AC charging at a maximum of 11 kW has been possible, for instance in residential areas. For fast-charging parks with high-power chargers (HPCs), transformer stations are normally installed with a connection to a powerful medium-voltage grid that operate 24 hours a day and require a significant initial investment. This is accompanied by an average charging time of only a few hours per day.
The charging park at the west gate of the Zwickau plant is made up of four charging stations, each with an output of 150 kW, which can also be divided into two outputs of 75 kW. This means that up to eight vehicles can charge at the same time. The electricity comes from the adjacent photovoltaic installation, among other sources. Because Volkswagen Sachsen has been purchasing green electricity since 2017, all vehicles are therefore charged with 100% renewable energy. Three fast-charging parks will be in operation on the plant grounds by the end of the year.
Audi – early adopter
For the PSC, Volkswagen Sachsen is relying on a solution that Audi already successfully used as part of the Audi charging hub in the urban area in Nuremberg. The container cubes consist of used lithium-ion batteries from disassembled Audi test vehicles that are used as buffer storage for direct-current (DC) electricity.