(Press release: Krefeld, March 2, 2017) – The innovative battery system by E-Stream Energy GmbH & Co. KG has passed several load tests at a major automobile manufacturer in southern Germany. A thermoelectric measurement was carried out on a lithium-ion battery module. In addition to a capacity test at 165 A, the module underwent two stress tests at currents of 195 A and 265 A and two cycles.

The measured capacity of the module was 165 Ah at 35°C mean module temperature. The internal resistances of the module were R1second = 4.264 mOhm at 25°C and 3.248 mOhm at 42°C, respectively. The internal resistances of the logic cell were R1second = 0.71 mOhm at 25°C and 0.54 mOhm at 42°C, respectively. A thermal resistance of 0.161 K/W was determined by the stress test with 195A RMS. The maximum temperature spread in the module was 13 K. The stress test with 265 A RMS was stopped at a temperature of 60°C. At the end of the first cycle a maximum temperature of 64°C was reached in the module, at the end of the second cycle 2 a maximum temperature of 56.5°C was reached.

Thomas Krämer, Managing Director of E-Stream Energy: “The test results show that we are able to produce tailor-made solutions with ideal temperature management for the automotive industry”.

The innovative battery system from E-Stream Energy features intelligent thermal management. This is made possible through the combination of the modular design of the battery module (“packaging”) with a special type of cell interconnection developed by E-Stream.

The load tests were carried out in the period from 20 to 22 February 2017 on the HV test bench of the automobile manufacturer.