Systems and methods for managing battery state of charge

A state of charge (SOC) control system of a vehicle comprising:

• an inverter power module that:
• when being switched, selectively applies power from a battery to a permanent magnet (PM) electric motor;
• and
• when not being switched, selectively provides power output by the PM electric motor for the battery;
• a switch (i) that is connected between the inverter power module and the battery, (ii) that, when open, prevents power flow the inverter power module from the battery, and (iii) that, when closed, enables power flow between the inverter power module and the battery;
• an adjustment module that determines an SOC adjustment based on at least one of (i) a vehicle speed and (ii) a temperature of the battery;
• a maximum module that receives a first maximum SOC of the battery that is less than 100 percent and that determines a second maximum SOC of the battery based on the first maximum SOC and the SOC adjustment;
• and
• a clutch control module that disengages a clutch, thereby decoupling the PM electric motor from a transmission, when the switch is stuck closed and an SOC of the battery is greater than the second maximum SOC.