As per my knowledge cell matching is done right at the battery manufacturing stage and if done properly then there would not be any need of such a balancing system at the operational level. However there is no harm but only advantage in employing such BMS for every battery stack in an EV.
This article describes clearly the real life problem of the multiple batteries connected. The replacement cost of these batteriies are high there is a good scope for R&D in this area to improve the battery life by employing intelligent chage discharge circuits.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.