Methods and systems for in-situ impedance spectroscopy analysis of battery cells in multi-cell battery packs

A method for on-demand in-situ analysis of multiple battery cells in a battery pack, the method comprising:

• applying a test profile to a first battery cell using a first node controller while the battery pack remains operational, wherein:
• the first battery cell is selected from the multiple battery cells in the battery pack for purposes of the on-demand in-situ analysis,
• the first node controller is connected with one or more additional node controllers of the battery pack,
• the one or more additional node controllers control the operation of one or more additional cells in the battery pack, and
• the one or more additional cells continue to charge or discharge using a power compensation profile while applying the test profile to the first battery cell independent from the applying the test profile to the first battery cell, and
• the power compensation profile used to charge or discharge the one or more additional cells is different from the test profile applied to the first battery cell;
• and
• determining one or more characteristics of the first battery cell based on a response of the first battery cell to the test profile applied to the first battery cell.