Fig. 6
From: Charge and discharge profiles of repurposed LiFePO4 batteries based on the UL 1974 standard
Four-probe method and temperature measurement. A current is passed through the outer probes (contacts 1 and 4) and induces a voltage in the inner voltage probes (contacts 2 and 3). The current and voltage can be measured simultaneously with high accuracy during the charge and discharge processes. On the other hand, the thermocouple locates at the center of the cylindrical surface of the cell for temperature measurement (red dot 5).
