Optimierung der Verfügbarkeit und der Lebensdauer von Traktionsbatterien für den Einsatz in Flurförderfahrzeugen

  • Optimization of Availability and Lifetime of Batteries used in Material Handling Applications

Büngeler, Johannes; Sauer, Dirk Uwe (Thesis advisor); Garche, Jürgen (Thesis advisor)

Aachen (2018)
Book, Dissertation / PhD Thesis

In: Aachener Beiträge des ISEA 111
Page(s)/Article-Nr.: 1 Online-Ressource (171 Seiten) : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2018


The replacement of internal combustion engines by electric motors has been identified as a way to achieve widely-accepted international climate protection goals. Especially in the material handling sector, vehicles with electric drives have gained increasing market acceptance over the past decades. However, the electrification of counterbalanced forklift trucks with high tonnages requires batteries with extended energy capacity. Higher energy capacity usually correlates with higher volume-to-surface ratios resulting in decreased heat dissipation and, therefore, increased average operating temperatures of the commonly used lead acid batteries. As a consequence, battery lifetime is greatly reduced. Without design changes, one possibility for avoiding high operating temperatures is an adapted battery management strategy. This thesis reports on results obtained with flooded lead acid batteries, demonstrating that, with management strategies which include operation in a partial state of charge, energy efficiencies can be increased from about 0.7 to about 0.85 with minimal impact on lifetime.