In distributed DC multi-microgrid systems with energy storage batteries, Each sub-microgrid achieve coordinated power distribution according to local operating conditions by droop control while maintaining DC bus voltage. This enhances power supply quality and improves system reliability. Based on traditional droop control for DC multi-microgrids, an improved droop control strategy is proposes that incorporates a consensus algorithm in this paper. This strategy allows each sub-microgrid to obtain the State of charge (SOC) of multi-microgrid battery clusters and adjust local battery operation modes based on both the system-wide and local battery SOC information. Under this control strategy, the batteries has faster convergence speed and longer operating life. Finally, simulation verification shows that the proposed method effectively addresses bus voltage stability and battery SOC convergence rate issues in multi-microgrid systems.