Methods and systems for managing multi-cell batteries

A system for determining battery cell voltages from a set of batteries connected in series, comprising:

• a plurality of first voltage controlled oscillators, each first voltage controlled oscillator configured to:
• receive a voltage value from a battery cell of a plurality of battery cells of the set of batteries;
• and
• convert the voltage value into an oscillating output signal;
• a plurality of digital level shifters, each digital level shifter configured to:
• receive the oscillating output signal from one of the plurality of first voltage controlled oscillators;
• and
• convert the oscillating output signal to a digital oscillating output signal;
• and
• digital circuitry configured to:
• receive the digital oscillating output signal from each of the plurality of digital level shifters;
• and
• calculate a voltage level from each battery cell of the plurality of battery cells based on the digital oscillating output signal, wherein the digital circuitry includes:
• a plurality of counters for receiving the digital oscillating output signals;
• and
• logic circuitry for calculating the voltage level based on count values from the plurality of counters and known electrical output values of the plurality of voltage controlled oscillators.