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.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.