LFP Battery Inflection-Point Detection During Fast Charging

The patent applies periodic action by switching between high current fast charging mode and low current detection mode at specific State of Charge intervals. The system performs voltage inflection point detection periodically when SOC enters a predetermined detection range, rather than continuously during high current charging. This periodic switching enables the battery to be charged at high speed overall while periodically allowing low current flow for accurate inflection point detection, thus resolving the contradiction between charging speed and detection capability.

The patent applies partial action by using low current charging only partially - specifically when the SOC enters the predetermined detection range for voltage inflection point detection. The majority of the charging process continues at high current for efficiency. The low current mode is applied selectively and temporarily only when detection is needed, thus achieving accurate detection without sacrificing overall charging efficiency.

The patent applies feedback by using voltage inflection point detection results to trigger battery equalization operations. When the inflection point is detected during periodic low current charging intervals, the system uses this feedback information to determine when equalization is needed and performs equalization on cells that require it. This feedback mechanism ensures battery equalization capability is maintained without significantly extending charging time, as equalization is performed opportunistically during detection intervals.