Cascade charging method for zinc-nickel battery

The invention discloses a cascade charging method for a zinc-nickel battery. The method comprises the following steps of S1, carrying out constant-current charging on the zinc-nickel battery by adopting an initial current so as to charge the voltage of the zinc-nickel battery to a preset voltage; S2, when the voltage of the zinc-nickel battery is charged to a preset voltage, reducing the cascade data on the basis of the initial current until the initial current is reduced to a cut-off current; S3, carrying out constant-current charging on the zinc-nickel battery by adopting the cut-off current; and S4, stopping charging the zinc-nickel battery when a preset condition is met. According to the invention, the zinc-nickel battery is charged in a constant-current step voltage limiting manner, so that the requirement design for a charger is simplified, and the cost of the charger can be reduced; the zinc-nickel battery is charged by controlling the charging voltage and the cut-off current, so that the charging amou