Action radius e-scooter depends on charging method

Gerard te Boekhorst from HE Technologie has about 100 e-scooters in maintenance. With electric scooters the action radius is most important: how far can you go on one battery? Te Boekhorst found that the battery power decreases quite rapidly. Within two years he saw the kilometers decrease from 60 to 40 kilometers on one battery. Gerard wondered if the problem was with the lithium ion battery, the battery management system or the charger. The scooter producer couldn’t provide him with a solution so he turned to the ‘Vragenbank’.

Together with KIEN, Gerard formulated the research question and then a meeting with a student from TU/e SURE Innovation followed. Gerard: “It’s important to have a good chemistry with the student. For us, the collaboration went perfect. Maarten was selected to come up with a solution. He already had experience in researching lithium cells in electric cars.”

The students soon found out the problem was with the charger and the battery management system. They also consulted with the producer from the scooter to look at the possibilities to change the charging system. When the battery charges as a whole. Not every cell is being charged equally. By charging every cell separately the loss of capacity will be reduced. However, to do this this you need a more expensive charger or the battery should have the possibility to open up. The scooter producer didn’t want to co-finance a better charger so periodically we open up the batteries and charge the battery cells separately. That way, the capacity and the action radius will be maintained.

The ‘Vragenbank’ works”, Te Boekhorst says. "For SME’s it’s ideal to get access to the knowledge base, resources and network from the TU/e."