The intermittent charging method of variable voltage makes the oxygen generated by the chemical reaction of the battery be recombined and absorbed by the intermittent charging method, which reduces the internal pressure of the battery and enables the battery to absorb more power. The experimental results verify that this charging method can effectively improve the charging speed and efficiency, and the variable voltage charging is more in line with the optimal charging curve of the battery. From the perspective of engineering, constant voltage control is easier to achieve.