In big data and energy internet, energy storage is the bottleneck technology. There are many energy storage technologies, and energy storage in a broad sense includes heat storage, hydrogen storage, and gas storage. With these links, reasonable adjustments will be made in the future, and now it is worth paying attention to lead-acid batteries, lithium-ion batteries and flow batteries. The alliance database has a global trend of development and change. 97% of the current power system is a pumped storage system, and there is no room for other countries to develop it. The fastest growing is the lithium-ion battery. We always turn lithium-ion batteries into energy storage benchmarks.