Internal AC Heating for Enhancing Lithium Battery Performance in Subzero Temperatures Based on Charge Pump Topology

Sub-zero temperatures pose significant challenges for lithium battery, impacting their capacity and performance. Preheating the battery, whether internally or externally, can mitigate these issues. However, internal heating achieves fast, efficient, and uniform heating. This article introduces an internal heating for heating lithium battery through ohmic losses by employing a charge pump to generate AC current. Simulations with an 18650 2.7Ah battery validate the efficacy of this method, demonstrating a remarkable heating rate of 8.26°C per minute with a current RMS of 2.04C at 50KHz while consuming approximately 3.09% of battery capacity.