Tool/software:
Hello,
I am working on a Li-Ion powered system incorporating a BLDC actuator which has use cases where regenerative current due to negative work (braking) is absorbed by the battery.
There is a possible failure mode where a user installs a fully charged battery before proceeding to engage in prolonged regen. The system is not super efficient, and less than 5% gained SOC is expected (we are optimizing for braking behavior, not regenerative energy capture).
However, we still want to protect the cells from over-charging in this scenario.
We would like to limit the battery's usable SOC to be between 10% and 90% actual capacity, where the lower 10% will be "reserve capacity," which I understand can be configured.
For the upper charge limit at 90% capacity, a previous e2e thread stated this could be achieved by configuring the COV and FC/TC values for gas gauging. However, for our use case, it is actually acceptable if the cells end up charged via regen past 90% capacity, and we cannot have a COV fault trip and disable the charge FET, as this will cause an overvoltage on the BLDC bus.
We essentially want to charge limit to 90% cell capacity, but still have COV protection configured for 100% cell capacity. It seems the OC protection threshold should be configured to account for the upper "reserve" capacity, but I am not sure if it is possible to still retain COV protection and have 0%-100% SOC gauge reflect 10%-90% of actual cell capacity. Can you provide guidance?
Thank you!
