Due to their low exhaust emissions and growing viability in terms of battery technologies, electric vehicles (EV) are swiftly acquiring a footing in international markets. Although EV power trains don't produce any pollutants while they're moving, their efficiency hasn't been fully optimized, in part because of the typical single-speed transmission. Since EV power trains use multispeed discrete transmissions, continuously variable transmissions, and multi-motor topologies, this paper presents a thorough review of the most recent work done to optimize the power flow in these systems. Using a keyword search linked to EV power train in the Science Direct and Scopus databases, the pertinent literatures were narrowed down. The review concentrated on works in the field that have been published since 2018. The publications' approaches for enhancing the power train's efficiency and driving performance were examined. The important discoveries from these literatures were then reviewed and contrasted. Several significant future research areas in EV power train efficiency and performance are highlighted based on the review.

Drivetrain of an Electric Vehicle, Continuously Variable Transmission, Multispeed Discrete Transmission, Two- or Four-Motor Arrangement.