This optional feature can be used to reduce charging voltages and/or currents based on measured parameters that reflect the aging of cells.

Here is an example of charging degradation using Cycle Count (although it is the same for the other aging parameters as itemized below):

In NORMAL mode (there is no reduction of ChargingCurrent() or ChargingVoltage()), ChargingCurrent() is reduced by CC Degradation Mode 1 (assuming the Cycle Count 1 entry conditions are met), then moving to Cycle Count Mode 2, ChargingCurrent() is further reduced by CC Degradation Mode 2 (assuming Cycle Count 2 entry conditions are met). This is similar for Cycle Count Mode 3.

Care should be taken to set the degradation mode thresholds such that each threshold is increased for each mode. The fact that any of the other measured aging parameters have not passed a degradation mode threshold would not cause the lower mode to be used.

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 the default values for how charging voltage and charging current are degraded for each degradation mode:

A degrade mode is entered when any measured parameter exceeds the thresholds set in data flash. The following thresholds are defined for each mode (see Data Flash Summary for threshold value settings and addresses).

• Cycle Threshold checked against CycleCount()
• SOH Threshold checked against StateOfHealth()
• Runtime Threshold checked against Runtime Degrade
• High SOC Threshold checked against the sum of all the high SOC times recorded in Lifetimes: Time Spent In UT RSOC A, Time Spent In LT RSOC A, Time Spent In STL RSOC A, Time Spent In RT RSOC A, Time Spent In STH RSOC A, Time Spent In HT RSOC A, and Time Spent In OT RSOC A
• High Temp Threshold checked against the sum of all the high temperature times recorded in Lifetimes: Time Spent In HT RSOC A, Time Spent In HT RSOC B, Time Spent In HT RSOC C, Time Spent In HT RSOC D, Time Spent In HT RSOC E, Time Spent In HT RSOC F, Time Spent In HT RSOC G, and Time Spent In HT RSOC H
• High Temp SOC Threshold checked against Time Spent in HT RSOC A

CycleCount() must be greater than Cycle Count Start Runtime before Runtime Degrade starts to increment and any degradation modes are detected.

The current degradation mode can be determined from the value of [CV_DGRD].

Runtime Degrade is updated to data flash every Runtime Update Interval and tracks the runtime after CycleCount() ≥ Cycle Count Start Runtime.