I just read this on Battery University
Source 1: https://batteryuniversity.com/learn/article/how_to_monitor_a_battery
Source 2: https://www.mpoweruk.com/soc.htm
" The EBM (electronic battery monitor) works well when the battery is new but most sensors do not adjust correctly to aging. The SoC accuracy of a new battery is about +/10 percent. With aging, the EBM begins to drift and the accuracy can drop to 20 percent and higher. This is in part connected to capacity fade, a value most BMS cannot estimate effectively. It is not an oversight by engineers; they fully understand the complexities and shortcomings involved. "
This brings up the question:
Why use a moreexpensive BMS systems or hardware like shunts to measure SoC% on battery packs with second life Li-ion cells?
Concluding from the quoted text, it seems that measuring SoC% on second lifebatteriesgives false accuracy for a high cost.
thoughts and ideas??
edit 1: added another source with similar statements around SoC inaccuracy for aged cells.
Source 1: https://batteryuniversity.com/learn/article/how_to_monitor_a_battery
Source 2: https://www.mpoweruk.com/soc.htm
" The EBM (electronic battery monitor) works well when the battery is new but most sensors do not adjust correctly to aging. The SoC accuracy of a new battery is about +/10 percent. With aging, the EBM begins to drift and the accuracy can drop to 20 percent and higher. This is in part connected to capacity fade, a value most BMS cannot estimate effectively. It is not an oversight by engineers; they fully understand the complexities and shortcomings involved. "
This brings up the question:
Why use a moreexpensive BMS systems or hardware like shunts to measure SoC% on battery packs with second life Li-ion cells?
Concluding from the quoted text, it seems that measuring SoC% on second lifebatteriesgives false accuracy for a high cost.
thoughts and ideas??
edit 1: added another source with similar statements around SoC inaccuracy for aged cells.