Abstract
This paper presents a design concept of an overcurrent protection for Li-Ion battery pack used in electric bicycles. This overcurrent protection scheme is implemented as a part of the battery management system (BMS). In addition to the conventional protection of the Li-Ion battery pack, the proposed concept extends the protection to cover also semiconductor devices in the motor converter from short-circuit fault and overloading. The protection scheme was developed based on i2t current-time protection characteristics in order to obtain interrupting characteristics in a similar way to conventional protection devices like circuit breaker or fuse. The developed protection concept was implemented by adapting the software algorithm of a high-grade battery management system platform without any hardware adaptation. The existing discharging MOSFETs are employed as the electronic circuit breaker mechanism for cutting-off the circuit. The functionality of the proposed concept was successfully validated by experimental results.
Published Version
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