Electrode based charging control for vehicle battery
A method for controlling charging of a battery to minimize or avoid lithium plating. The method may include charging the battery during with a first charge current having a first charge profile, monitoring charging of the battery with the first charge current, and thereafter charging the battery with a second charge current having a cathode charge profile to prevent a cathode potential of the battery from exceeding a cathode threshold.
1 . A method for minimizing or avoiding lithium plating when direct current (DC) fast charging a battery included in a vehicle, comprising:
charging the battery during a first charging phase with a first charge current having a first charge profile, wherein the first charge profile is associated with the first charge current being provided to the battery prior to a cathode voltage potential approaching a cathode threshold; and
commencing a second charging phase for charging the battery with a second charge current having a cathode charge profile, the cathode charge profile configured to prevent the cathode voltage potential from exceeding the cathode threshold by incrementally decaying the second charge current to prevent the cathode voltage potential of a cathode of the battery from exceeding the cathode threshold.
2 . The method according to claim 1 , further comprising:
commencing a third charging phase for charging the battery with a third charge current having an anode charge profile, the anode charge profile incrementally decaying the third charge current to prevent an anode potential of an anode of the battery from exceeding an anode threshold.
3 . The method according to claim 2 , further comprising:
commencing the second charging phase after the first charging phase and prior to the third charging phase.
4 . The method according to claim 3 , further comprising:
the first charge profile consistently maintaining the first charge current in a non-decaying manner;
the cathode charge profile incrementally decaying the second charge current at a first decaying rate; and
the anode charge profile incrementally decaying the third charge current at a second decaying rate greater than the first decaying rate.
5 . The method according to claim 2 , further comprising:
commencing the second charging phase after the first charging phase and after the third charging phase.
6 . The method according to claim 5 , further comprising:
the first charge profile consistently maintaining the first charge current in a non-decaying manner;
the anode charge profile incrementally decaying the second charge current at a first decaying rate; and
the cathode charge profile incrementally decaying the third charge current at a second decaying rate greater than the first decaying rate.
7 . The method according to claim 2 , further comprising:
monitoring the cathode potential; and
commencing the second charging phase in response to the cathode potential being within a predefined cathode range of the cathode threshold.
8 . The method according to claim 7 , further comprising:
monitoring the anode potential; and
commencing the third charging phase in response to the anode potential being within a predefined anode range of the anode threshold.
9 . The method according to claim 2 , further comprising:
monitoring a state of charge (SOC) of the battery; and
commencing the second charging phase in response to the SOC exceeding a cathode SOC threshold.
10 . The method according to claim 9 , further comprising:
monitoring a state of charge (SOC) of the battery; and
commencing the third charging phase in response to the SOC exceeding an anode SOC threshold.