Ultra-large capacity lead-acid batteries of 2000Ah and above are the core units of large-scale centralized energy storage power stations. They form energy storage arrays through series and parallel connection, suitable for grid-level and photovoltaic power station large-scale energy storage scenarios. They are mainly used for photovoltaic peak regulation, grid peak-valley arbitrage, off-grid power storage of large remote photovoltaic power stations and centralized backup power for industrial plants. They store intermittent new energy power to stabilize grid load and ensure regional power supply stability. With mature technology, high safety and low large-scale application cost, they are a key solution for new energy supporting centralized energy storage.