Implementation of five level charging scheme in lithium ion batteries for enabling fast charging in plug-in hybrid electric vehicles

TLDR: Conventional charging scheme and the five-level charging scheme are simulated in PSIM software, and the later scheme is experimentally verified for a 1 Ah, 3.7 V Li-ion battery.

Abstract: Electrical machine is getting emerged as modern-day propulsion medium in transportation due to its several advantages over conventional internal combustion engine (ICE). The advantages include reduced emissions, less fuel costs, better control and operation. Inspite of the aforementioned advantages, the uses of electrical machine based Plug-in hybrid electric vehicles (PHEVs) are not up to the expected level due to some of its major drawbacks; One of those is high charging time required to charge the battery bank used to drive the electrical motor. Lithium-ion (Li-ion) batteries are one of the potential candidates to be used in PHEV application. With advancement of charging system in the recent time, a fast and safe charging of battery, five level charging method is proposed in few years back. The present work focuses on implementation of the five-level charging scheme for Li-ion battery. A charging system is proposed to implement the charging scheme. Conventional charging scheme and the five-level charging scheme are simulated in PSIM software, and the later scheme is experimentally verified for a 1 Ah, 3.7 V Li-ion battery. A comparison between the two changing methods is also presented.