Experimental results show that this method can effectively measure the actual voltage of lithium-ion battery under different rated voltages, and the measured voltage waveform is very stable and almost without distortion.
In order to check the battery voltage you have to stop the load and charging circuits, wait until the battery voltage settles and then measure it. Measuring by current is not good, your load can drain different amounts of current, which will give you false results. You need to measure the charging current.
A current sense resistor is a good idea. Also, about your edit, applying a constant voltage constant current source to a BMS is a common way to recharge a Lithium-ion battery. I measured the voltage and current of mine, and I confirmed the curves you'd expect from a proper charger.
Scientists have presented a non-contact method for detecting defects in lithium-ion batteries using atomic magnetometers. They measure the magnetic field around battery cells for this purpose.
Scientists have presented a non-contact method for detecting the state of charge and any defects in lithium-ion batteries.\n\nRechargeable batteries, including lithium-ion batteries, are at the heart of many new technologies involving, for example, the increased use of renewable energies. They are employed to power electric vehicles, cell phones, and laptops.
As one of the key testing indexes for the performance of lithium battery, the testing of charging and discharging characteristics can directly show the capacity and performance of lithium battery. The advantages of lithium battery mainly have no pollution, no memory and large monomer capacity, which are widely used in various electronic products.