SLUUCP8 June 2024 BQ41Z50
When [DEGRADE_CC] = 1, charging current can also be degraded in addition to charging voltage degradation. The following is the charging current degradation process:
When a Degradation Mode is entered, whether though cycle count based, SOH based, or runtime based degradation, the highest degradation mode determines the level of ChargingCurrent() adjustment.
In NORMAL mode, no ChargingCurrent() adjustment is applied.
Entering Degradation Mode 1, ChargingCurrent() is reduced by Current Degradation for Mode 1. Enterning Degradation Mode 2, ChargingCurrent() is reduced by Current Degradation for Mode 2. Similarly for entering Degradation Mode 3, as the ChargingCurrent() is reduced by Current Degradation for Mode 3. The charging current mode reduction is a one-way transition. The gauge only goes from Normal → Lvl1 → Lvl2 → Lvl3. The three degradation points each occur one time when the Degradation Mode is reached due to any of the cycle count, SOH, or runtime based degradation criterias.
This charging current degradation scheme (if enabled) works in conjunction with any other existing degradation/increments (such as charge loss compensation).
The following table shows how charging voltage and charging current are degraded at different points:
| Cycle Count (in counts)/SOH (in
%)/Runtime
(in hrs) (One or the other must be enabled.(1)) | Charging Voltage (CV) (CV degradation is available by default.) | Charging Current (CC) (CC degradation is available if enabled [Degrade_CC].(2)) |
|---|---|---|
| Degradation Normal | No Voltage Degradation | No Current Degradation |
| Degradation Mode 1 | Voltage Degradation (default 10 mV / cell) | Current Degradation (default 10%) |
| Degradation Mode 2 | Voltage Degradation (default 40 mV / cell) | Current Degradation (default 20%) |
| Degradation Mode 3 | Voltage Degradation (default 70 mV / cell) | Current Degradation (default 40%) |