(Press release: Krefeld, February 16, 2017) – The innovative battery system of E-Stream Energy GmbH & Co. KG has passed several load tests by BatterieIngenieure GmbH. A homogeneous temperature distribution within the tested lithium-ion battery module was measured during all experiments, although it does not have its own active cooling system. In addition to peak performance and discharge curves at different current levels, the real driving profile of an electric vehicle and synthetic driving profiles were also measured.

The measured values for nominal energy and nominal capacity were above the specified values. The driving profiles were also tested. Temperatures and voltages remained below the limits during the pulses. In the real driving profile, a total of 171.5 Ah were unloaded from the module. The module was able to provide short-term very high outputs, such as discharge pulses with 800 A, without any problems. In the case of discharges with high currents for a long period, such as constant current discharges with 312 A, the temperature values rose continuously. Here the high temperature was the limit for the unloading process.

Thomas Krämer, Managing Director of E-Stream Energy: “The test results of the battery engineers show that our innovative battery systems are very resilient even without their own active cooling. Our intelligent thermal management prevents the formation of hotspots within the battery modules – thus ensuring consistently high performance.”

Intelligent thermal management is made possible by combining the modular design of the battery modules (“packaging”) with a special type of cell interconnection developed by E-Stream. This means that the heat is evenly distributed within the battery module.

The load tests were carried out in the period from 8 to 10 February 2017 in the laboratory of BatterieIngenieure GmbH in Aachen.