Method and system for electrical energy storage maintenance on fleet level

A computer-implemented method for improving lifetimes of electrical energy storages of a fleet of vehicles each associated with one of several missions, the method comprising:

• acquiring, by a processor device of a computer system, data indicating hard vehicle fleet performance constraints including:
• a total energy and power constraints in the fleet electrical energy storages for fulfilling the fleet missions, and energy and power requirements for fulfilling vehicle missions for individual vehicles,
• determining, by the processor device, present state of health (SOH) of each of the electrical energy storages of the fleet,
• identifying, by the processor device, electrical energy storages of vehicles in the fleet with SOH such that the energy and power requirement for its mission is not fulfilled,
• acquiring, by the processor device, data of warehouse inventory of available electrical energy storages and their SOH,
• acquiring, by the processor device, a schedule of planned workshop visits of vehicles of the fleet including the vehicles having electrical energy storages with insufficient SOH and at least one other vehicle of the fleet,
• for a given distribution of vehicle missions on a fleet level, determining, by the processor device, a required minimum number of vehicles to fulfil the vehicle missions on the fleet level,
• computing, by the processor device, a forecast SOH or an aging prediction for each of the electrical energy storages of the fleet for each of the missions of the fleet,
• for the required minimum number of vehicles, computing, by the processor device, an electrical energy storage replacement/reshuffle strategy including a required electrical energy storage distribution among the required minimum number of vehicles that meet the hard constraints with their forecast SOH with minimum margin, and a replacement time slot schedule that minimizes vehicle downtime for reshuffling of electrical energy storage between vehicles and/or replacement from the warehouse by utilizing the already planned workshop visits, and
• providing, by the processor device, an instruction including the electrical energy storages replacement/reshuffle strategy.