Battery parameter estimation apparatus and method

A method comprising:

• applying a preliminary discharge/charge cycle to a plurality of battery cells to obtain an initial capacity of each battery cell;
• applying multiple small current discharge/charge cycles to the plurality of battery cells to minimize initial voltage deviations of the plurality of battery cells;
• configuring a first battery cell of the plurality of battery cells to be tested at a plurality of first testing points;
• configuring a second battery cell of the plurality of battery cells to be tested at a plurality of second testing points;
• and
• configuring a third battery cell of the plurality of battery cells to be tested at a plurality of third testing points, wherein the first battery cell, the second battery cell and the third battery cell are tested concurrently for generating an OCV-SOC curve, and the plurality of first testing points, the plurality of second testing points and the plurality of third testing points are arranged in an alternate manner.

An apparatus comprising:

• a voltage sensor configured to measure OCV values of each battery cell of a plurality of battery cells configured to be tested concurrently in a chamber;
• a current sensor configured to measure current values of each battery cell of the plurality of battery cells;
• and
• a control circuit configured to receive measured OCV values and measured current values of the plurality of battery cells, generate an OCV-SOC curve for each battery cell and merge OCV-SOC curves of the plurality of battery cells into a single OCV-SOC curve representing the plurality of battery cells from a fully charged state to a fully depleted state.