![]() Measuring Individual Cell Voltage in a Series Battery Stack For the sake of this project we will use four lithium 18650 cells connected in series to form a battery pack and design a simple circuit using op-amps to measure the individual cell voltages and display it on a LCD screen using Arduino. In this article we will learn how we can measure the individual cell voltage of the cells used in a Lithium battery pack. So measuring the voltage and current of cell is vital for any BMS circuit, be it a simple power bank or laptop battery or as complicated pack as EV/Solar batteries. Only with these two values the BMS could calculate the SOC or SOH and perform cell balancing etc. This is done by measuring the voltage and current (sometimes temperature also) of the cells in the pack. To do anything, the first step for the BMS would be to know the current status of the cells in the Lithium battery pack. ![]() We have already learnt enough of it in this Battery Management System article, so check them out if you are new here. A BMS is a sophisticated unit in an EV which does a lot of activity like monitoring the cells, balancing them and even protecting them from temperature changes. To maintain the battery pack in full health is the responsibility of the Battery Management System (BMS). The mileage and performance of an Electric Vehicle depends on the capacity and efficiency of its Battery Pack.
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