Multicell Voltage measuring for BMS in Electric Vehicles

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In this article we will learn how we can measure the individual cell voltage of the cells used in a Lithium battery pack and will design a simple circuit using op-amps to measure the individual cell voltages and display it on a LCD screen using Arduino.

The mileage and performance of an Electric Vehicles depends on the capacity and efficiency of its Battery Pack. To maintain the battery pack in full health is the responsibility of the Battery Management System (BMS). 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.

Check out the complete project explanation here: Project



Multi-cell charger PCB


ID Name Designator Footprint Quantity
1 OPA4197 U1,U2 SOP14 2
2 Battery Pack Connector H1 DIP-1X5P-2.54MM-M 1
3 1k R1,R3,R4,R5,R6,R2,R7,R8,R9,R10,R11,R12,R14 AXIAL-0.3 13
4 10k R13 AXIAL-0.3 1
5 Header-Male-2.54_1x3 P1 HDR-3X1/2.54 1
6 Pack Positive P2 HDR-3X1/2.54 1
7 Pack Negative P3 HDR-3X1/2.54 1
8 Header-Male-2.54_1x5 H2 DIP-1X5P-2.54MM-M 1


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