Energy consumption can be one of the most critical cost factors in manufacturing, especially for processes requiring a continuous and intensive use of energy. IK4-IKERLAN (www.ikerlan.es), a Spanish Technological Centre based in the Basque Country, is busy engineering integrated tools for battery packs used in industry with innovative energy efficiency characteristics, and more than that, with the ability to put in place control strategies aimed at releasing energy to the process when this is most needed, in correspondance with prices peaks on the market.
The principle sounds simple. “Battery based electric energy storage, or ESS is a key feature to facilitate the integration of renewables into productive processes – explains Bakartxo Egilegor, a researcher specialised in thermal processes – the problem we wanted to tackle was the intrinsic variability of renewable sources and need to adapt energy consumption through intelligent shifts, reducing consumption when energy is at a higher price and thus offering a backup service to part of the factory power supply. This is why we talk about an optimised control energy, which if implemented at large scale, may offer significant reductions in costs”.
Work therefore concentrated on delivering a battery pack sizing tool, the function of which is to optimise the front cost of the electrical storage system. “To develop it – continues Bakartxo - several variables had to be taken into account, such as the application power profiles, the energy management strategy used by the factory, the battery performance and also the ageing of the battery itself, for which specific models have been generated. In the end the tool performs an economic profitability study of the system, looking also at application and cost aspects, as these are important constraints for the sizing of the battery pack”. A simplified version of the sizing tool is in the process of being integrated in a more complex software tool engineered by Irish company IES in the REEMAIN project.
On the other hand, IK4-Ikerlan has also designed and developed an innovative compact and scalable battery pack system based on lithium ion technology, which operates under thermal and an energy management systems designed to ensure its safe operation and best performance. “The management systems – says Bakartxo - have been developed having in mind that the solution should be scalable to applications with higher energy demand. For example, the thermal management system is able to keep the cells in the range of 20°C to 30°C to maximize their lifetime in environment temperatures from -15°C to 45°C.”