// Joint NET-INES project

Batteries installed in electric vehicles are capable of temporarily storing excess energy from the electricity grid and feeding electricity into the grid at times of high power demand. The NET-INES (grid integration of mobile energy storage systems) project has analysed various charging and discharging strategies, investigating the technical, economical and motivational requirements relating to the grid integration of mobile electrical energy storage involving traction batteries. The expectations of potential owners of electric vehicles were also investigated. ZSW’s System Analysis department was furthermore tasked with producing a technical and economic model to determine the residual value of used electric vehicle batteries which can be deployed in second life applications as stationary energy storage systems. Disused vehicle drive batteries generally have sufficiently high residual capacities to meet the requirements of second life application. The most important input factor in the residual value calculation is the ageing of the used battery, which the ZSW Accumulators department can simulate using an ageing model. Simulations have shown that the salvage value of a used electric vehicle battery is likely to decrease in the future due to falling battery costs. This allows such batteries to be used cost-effectively in stationary secondary use applications, for instance in the provision of grid services. Aside from the two above-mentioned ZSW departments, the Technical University Berlin is also involved in the NET-INES project, which is under the overall management of the Research Centre Jülich.

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