Method and control arrangement for mass scale production testing of secondary cells

A method for evaluating cell health of secondary cells (1) in mass scale production testing, the method comprising:

• obtaining (S1) manufacturing data (dman) recorded during cell manufacturing and associated with the secondary cells (1), and
• upon the secondary cells (1) being fully assembled,
• generating (S2) scanning data (dscan) by scanning an inside of, at least a subset of the secondary cells (1) using a radiation-based scanning technology,
• determining (S3) cell quality of the individual secondary cells using a prediction algorithm that predicts cell quality based on obtained manufacturing data (dprod) and/or the generated scanning data (dscan),
• performing (S4) additional testing using an alternative testing technology having higher reliability than the radiation-based scanning technology, only on a selection of the scanned secondary cells (1),
• verifying (S5), based on the additional testing, that accuracy of the prediction algorithm meets predefined accuracy requirements that must be met in order for the determined cell quality to form a basis for production testing, and
• evaluating (S7) cell health of the individual secondary cells (1) based on the cell quality determined using the prediction algorithm.