An equalization circuit, comprising: a first converting unit, configured to receive a direct voltage output by a first battery cell and to convert the direct voltage output by the first battery cell into a first alternating voltage; a first resonant unit, configured to receive the first alternating voltage and to convert the first alternating voltage into a second alternating voltage in a resonant manner, wherein a magnitude of the second alternating voltage is greater than that of the first alternating voltage; a first capacitive coupling unit and a second converting unit, wherein the first capacitive coupling unit is configured to couple the second alternating voltage to the second converting unit in a capacitive coupling manner, and the second converting unit is configured to convert the second alternating voltage into a first charging voltage for charging a second battery cell; and a second resonant unit and a second capacitive coupling unit; wherein the second converting unit is further configured to receive a direct voltage output by the second battery cell and to convert the direct voltage output by the second battery cell into a third alternating voltage; the second resonant unit is configured to receive the third alternating voltage and to convert the third alternating voltage into a fourth alternating voltage in a resonant manner, wherein a magnitude of the fourth alternating voltage is greater than that of the third alternating voltage; and the second capacitive coupling unit is configured to couple the fourth alternating voltage to the first converting unit in a capacitive coupling manner, and the first converting unit is further configured to convert the fourth alternating voltage into a second charging voltage for charging the first battery cell. a first converting unit, configured to receive a direct voltage output by a first battery cell and to convert the direct voltage output by the first battery cell into a first alternating voltage; a first resonant unit, configured to receive the first alternating voltage and to convert the first alternating voltage into a second alternating voltage in a resonant manner, wherein a magnitude of the second alternating voltage is greater than that of the first alternating voltage; a first capacitive coupling unit and a second converting unit, wherein the first capacitive coupling unit is configured to couple the second alternating voltage to the second converting unit in a capacitive coupling manner, and the second converting unit is configured to convert the second alternating voltage into a first charging voltage for charging a second battery cell; and a second resonant unit and a second capacitive coupling unit; wherein the second converting unit is further configured to receive a direct voltage output by the second battery cell and to convert the direct voltage output by the second battery cell into a third alternating voltage; the second resonant unit is configured to receive the third alternating voltage and to convert the third alternating voltage into a fourth alternating voltage in a resonant manner, wherein a magnitude of the fourth alternating voltage is greater than that of the third alternating voltage; and the second capacitive coupling unit is configured to couple the fourth alternating voltage to the first converting unit in a capacitive coupling manner, and the first converting unit is further configured to convert the fourth alternating voltage into a second charging voltage for charging the first battery cell.