Techniques for estimating open circuit potential in lithium-ion batteries without electrode teardown

An open-circuit potential (OCP) estimation method for a battery system of an electrified vehicle, the OCP estimation system comprising:

• measuring, by a set of sensors, a set of operating parameters of a battery cell of the battery system, the battery cell being a lithium-ion type battery cell and comprising two electrodes;
• and
• performing, by a computing device associated with the electrified vehicle, an OCP estimation process based on the measured set of operating parameters, the OCP estimation process further including:
• obtaining known information relating to the two electrodes;
• identifying one of the two electrodes as a known electrode based on the known information;
• applying a physics-based model to reconstruct an OCP curve for the known electrode;
• determining lithiation ranges of the other of the two electrodes based on experimental test results for the battery cell;
• reconstructing an OCP curve for the other of the two electrodes based on its lithiation ranges;
• and
• generating a final estimate of the OCP of the two electrodes of the battery cell based on the reconstructed OCP curves.