Dynamic Battery Undervoltage Protection via Temperature

The patent applies dynamics by making the undervoltage protection threshold dynamic rather than fixed. The protection voltage value is adjusted in real-time based on the battery's state of charge (SOC) and temperature conditions. When SOC is high, a higher protection threshold is applied; when SOC is low, a lower threshold is used. This dynamic adjustment allows the system to maintain reliable protection while adapting to varying battery conditions, preventing premature activation at low temperatures when battery impedance is high.

The patent changes the parameter of protection voltage threshold based on operating conditions. Instead of using a single fixed voltage value, the system modifies the protection threshold parameter according to SOC levels and temperature. At high SOC, the threshold is raised to allow greater power utilization; at low SOC, it is lowered to prevent true undervoltage damage. This parameter change resolves the contradiction by making protection adaptive rather than static.

The system changes the protection voltage parameter dynamically based on SOC. When SOC is high (above threshold), the protection voltage is set higher, allowing the battery to discharge more fully before protection activates. When SOC is already low, the protection voltage is set lower to prevent actual damage. This ensures safety is maintained while maximizing energy utilization at high SOC states.

The patent applies partial protection action based on SOC levels. Instead of always applying the same protection threshold, the system applies a higher threshold (excessive action) when SOC is high, allowing greater power utilization. When SOC is low, a lower threshold is applied (partial action) to prevent true undervoltage damage. This selective application of protection levels resolves the contradiction between safety and energy efficiency.

The patent makes both protection voltage and delay time dynamic parameters. The protection voltage adjusts based on SOC and temperature, while the delay time adjusts based on the rate of voltage decline and operating conditions. This dynamic behavior provides flexible adaptation to different scenarios while maintaining basic protection functionality.

The system changes multiple parameters (protection voltage and delay time) based on operating conditions. When temperature is low and impedance is high, the voltage threshold and delay are adjusted to prevent false activation. When the battery is in normal conditions, standard protection parameters apply. This multi-parameter adjustment provides the flexibility needed to adapt to various operating scenarios.