NTC Thermistor Reliability in Automotive Battery Circuits

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  • Author: Alain Stas
As the electric vehicle (EV) market continues its rapid growth, so too do technical challenges and the innovations developed to address them. Of these, design engineers are most heavily focused on improving battery technology, power circuit efficiency, and fast charging solutions. Currently the dominant battery chemistry used in EVs is lithium-ion, with single cell voltages of 3.6 V to 3.7 V. Creating a power system with an overall voltage of 500 V to 900 V can therefore require up to a few hundred of these cells in a serial-parallel set-up. Furthermore, optimizing the performance for a system involving this many cells requires an efficient battery management system (BMS), which must monitor temperature, impedance (internal cell resistance), the voltage, and the charge and discharge current. Each of these specifications impacts battery performance.
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