Investigation and Optimization of the Accuracy of Current Sensors for High Voltage LFP-Batteries
Conference: PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/16/2017 - 05/18/2017 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2017
Pages: 7Language: englishTyp: PDF
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Authors:
Bischof, Simon; Blank, Thomas; Weber, Marc (Karlsruhe Institute of Technology (KIT), Germany)
Abstract:
A highly accurate low-cost current measurement system for lithium-ion battery management systems is presented. It provides current measurement for currents between -30 A and +30 A under operating conditions between -20 °C and +70 °C. Three error compensation methods have been investigated (no compensation: 0.98 % error; offset compensation: 0.78 % error; linear compensation: 0.16 % error). While the current sensor without compensation fulfills the requirements of norm DIN EN 62619, the more accurate, compensated sensor can be used to provide an accurate state of charge estimation, for battery storage systems using lithium iron-phosphate (LFP) cells with extremely flat voltage over state of charge (SoC) dependency.