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I did a calibration test last night on my blue Soul EV
MY2015, 27kWh, 75,000km, SOH=96%, Charging at 28.8A up to 100% SOC. Original battery and original BMS.
Calibration occurred in two parts, first at 92.5% SOC, second at 100% SOC after charging had completed.
Before max det 15.0%, min det 10.4%
First calibration occurred at 394V battery voltage, Some cells 4.10 V some 4.08V, 92.5% SOC.
After max det 15.0%, min det 11.2%
Second calibration occurred at 398.1V battery voltage, Some cells 4.14 V some 4.12V, 100% SOC.
After max det 14.5%, min det 11.2%
A few days later - another charge to 100% SOC
Calibration occurred at 394V battery voltage, Some cells 4.10 V some 4.08V, 92.5% SOC.
After max det 14.5%, min det 12.6%
Conclusion. After 5 years there is no change on my car to how and when calibration occurs.
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A manual for updating the BMS is here -
Service Action: Battery Management System (BMS) Logic Improvement (SA297)
In it we learn that battery calibration actually occurs as the battery is charged from less than 20% SOC to more than 90% SOC
Inform the customer that the BMS update will reset the adaptive learning values to default conditions. As a result, the displayed range/DTE (Distance to Empty) and charge times may be temporarily increased. It does not affect the actual range or battery charging time. These displayed values will gradually be relearned to reflect the actual battery condition with multiple drive and charge cycles performed above 50°F (10°C) from less than 20% SOC to more than 90% SOC.
