Battery energy balancing circuit

Abstract

The invention relates to a battery energy balancing circuit. The battery energy balancing circuit comprises a first battery pack and a second battery pack which are sequentially connected in series for output, wherein each battery pack comprises a battery, two switch tubes and two diodes. The battery energy balancing circuit further comprises a controller and a resonant impedance. The batteries conduct periodic energy transfer through the battery energy balancing circuit. The controller is connected with the first switch tube to transfer energy of the first battery to the resonant impedance, connected with the second switch tube to transfer energy of the resonant impedance to the second battery, connected with the fourth switch tube to transfer energy of the second battery to the resonant impedance, and connected with the third switch tube to transfer energy of the resonant impedance to the first battery. The battery energy balancing circuit adopts the series resonance of the switching capacitance and the resonant inductance to achieve zero-current switching on/off of the switch tubes, has high efficiency and can not cause large energy conduction loss or switching loss during energy transfer. 本发明涉及一种电池能量平衡电路，包括依次串联输出的第一电池组和第二电池组，每个电池组包括电池、两个开关管、两个二极管；同时电池能量平衡电路还包括控制器以及谐振阻抗；电池通过电池能量平衡电路进行周期性的能量传递，控制器通过接通第一开关管将第一电池的能量传递给谐振阻抗，控制器通过接通第二开关管将谐振阻抗的能量传递给第二电池；控制器通过接通第四开关管将第二电池的能量传递给谐振阻抗，控制器通过接通第三开关管将谐振阻抗的能量传递给第一电池。本发明的电池能量平衡电路采用开关电容和谐振电感的串联谐振实现零电流接通或断开开关管，高效，能量传递时不会造成大的能量传导损失或开关损失。