System for determining a discharge power limit value and a charge power limit value of a battery cell

A system for determining a discharge power limit value of a battery cell, comprising:

• a current sensor generating a first signal having a first current value therein indicating a current level flowing through the battery cell at a first time;
• a microprocessor calculating a maximum allowed voltage drop value corresponding to a difference between a voltage measured across the battery cell at the first time and a minimum allowed voltage of the battery cell;
• the microprocessor calculating a first discharge current level through the battery cell for N seconds after the first time to obtain the maximum allowed voltage drop value, based on the first current value;
• the microprocessor calculating an adjusted maximum allowed voltage drop value based on the maximum allowed voltage drop value, and an estimated delta OCV value at N seconds after the first time;
• the estimated delta OCV value being calculated based on the first discharge current level;
• the microprocessor calculating a second discharge current level through the battery cell for N seconds after the first time to obtain the adjusted maximum allowed voltage drop value;
• and
• the microprocessor calculating a discharge power limit value based on the second discharge current level, if the second discharge current level is less than or equal to a maximum allowed discharge current.