Active Battery Management System (BMS) with Data Gathering System in Electric Research Vehicle A test will be performed on a completely self-developed active battery management system (BMS) for lithium-ion cells in a research vehicle. The system consists of one master node and three slave nodes. The master node serves to communicate data between the slave nodes or the vehicle's onboard CAN-Bus (a real-time gateway between the BMS and vehicle ECU). Every slave node monitors the parameters of up to ten connected cells and controls the voltage balancing via a predetermined algorithm. Out of all of the different possibilities for active balancing, a Multi-Winding- Transformer design was chosen and built with every individual cell containing its own secondary transformer winding. Upon a high voltage difference, the cell with higher electric potential provides energy to be stored in the transformer core. Upon release of the stored energy, the primary side current flows back into the battery block (Efficiency of over 90%, cyclic process until voltage is equalized). The master node is an operator interface device (ARM Cortex-A8 with 7"-Display) and receives all information on the BMS-CAN-Bus. The master node also controls the charging process, meaning the output voltage and current of the charge controller. The actual voltage, the current and the performance of the electric drive and the SOC (state of charge) of the traction battery are presented. Further information such as the energy usage, efficiency, as well as the temperature and voltage of all cells is displayed in the multifunction window. The ECO (energy saving mode) and recuperation functions can be manually activated. During every measurement drive the received data is saved to a SD Card, whereby a data-logging function was integrated. An Android based tablet receives data from the Master Node with self-made app. The app captures the cell voltage, energy usage, instantaneous power, cell temperature, charge status and so forth. A comparison of active and passive balancing was carried out. It was seen that both principles in reality achieve the same final states. The results of the tests are presented.


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