Low Temperature Anode Potential Tracking for Metallic Lithium Plating Prevention
Dynamic tracking of graphite anode potential prevents sub-zero metallic lithium plating by throttling charging current before interfacial overpotentials breach 0V.
Thermal Derating
Meaning
Current limit adjustments reduce the maximum allowable charge or discharge rates when the cell temperature rises above safe thresholds. This protective measure prevents the cell from entering a thermal runaway state and minimizes the rate of high temperature chemical degradation. The thermal derating strategy is integrated directly into the system controller algorithms.
Thermal Management
Heat generation during high power operation can quickly raise the cell temperature beyond the safety limits if not controlled. This algorithm dynamically lowers the current limits as the temperature approaches the critical boundaries, protecting the system from damage. This action helps maintain the cells within their optimal operating window.
Degradation Prevention
High temperatures accelerate the growth of the solid electrolyte interface and speed up the decomposition of active materials. By reducing the current, the derating algorithm slows down the rate of internal heat generation, preserving cell capacity. This protective function is essential for maintaining battery life in harsh climates.
System Reliability
Implementing these current limits ensures that the overall system can continue to operate safely even under extreme thermal stress. This action prevents sudden shutdowns and allows the system to remain functional at reduced performance levels. This capability is crucial for applications that require high reliability.