Optimisering av elanvändning vid batteriproduktion

Abstract

Energy storage is an important key for future energy systems. A most common form of energy storage is the battery. However, producing a battery is not very efficient nor sustainable. Therefore, every part and every machine in the manufacturing process must be measured and analysed. The next step is to find solutions of how to make each part more effective. The purpose of the thesis was to analyse the power consumption of a battery cycling machine and log the temperature changes. The quality of a battery cell is tested by charging and discharging the cell to different state of charge in this machine. The results showed a lower efficiency during standby state, which is a state when the machine is not used yet is still running. The efficiency increased during charge and discharge of the cells. Moreover, with enough cells discharging at the same time, the machine could produce electricity. This would also mean that the cells charge at the same time and lead to a volatile load profile. The temperature increased slightly during charge and discharge but not above the upper limit. In summary, by scheming the usage of the machines adapted to the number of cells, some machines can be turned off instead of being in standby state. All the machines should be connected to each other in order to exchange excess electricity between them. These solutions can lower the power consumption and make the process more efficient