How to achieve high precision shunt BMS battery current measurements?

Accurate current measurement is critical to the evaluation of BMS performance and battery understanding, so how can current measurement be the most accurate?

One of the most mature methods to achieve high accuracy and wide dynamic range shunt-based BMS battery current measurement is the use of high-resolution (ΔΣ) ADacs.
A typical implementation consists of a ΔΣADC with a resolution of at least 24 bits followed by a digital isolator.
The shunt is usually placed on the high-voltage terminal of the battery pack, and the ADC measures the shunt current with reference to the same high-voltage terminal. Because the splitter has a very low resistance value, the voltage drop at both ends of the splitter is very small. As a result, ADCs are capable of measuring small bidirectional voltage drops with high accuracy and dynamic range.

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How to test a BMS fault with a multimeter?

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