Formation and grading

Formation commonly uses controlled current, voltage, temperature, and rest conditions to bring a cell to its initial operating state and promote interphase formation. Materials and designs respond differently, so protocol changes require renewed safety and later-performance supporting information.

Capacity, resistance, self-discharge, and other metrics can identify cell variation under defined conditions, but each depends on method and sample state. Record test time, temperature, program, and equipment state to avoid mistaking measurement drift for product variation.

The value of handling anomalous cells lies in linking results to upstream lots and stations rather than merely screening them out. Traceable failure classification, retained samples, and trend analysis help distinguish random variation, systemic drift, and newly introduced process risk.