ENERGY STORAGE SYSTEM

An energy storage system is provided to simplify production of lithium battery packs, improve installation efficiency of lithium batteries, and reduce costs. The energy storage system includes battery cells (201), a subrack (202), a backplane (203), and a battery management system BMS (204). The subrack (202) reserves a plurality of battery cell slots (2021), the battery cells (201) are connected to the backplane (203) through the battery cell slots (2021). The backplane (203) is installed in the subrack(202), a first power terminal (2031) is reserved at a position corresponding to the battery cell slot (2021) on the backplane (203), and a plug-in power terminal is formed by a second power terminal (2011) of the battery cell (201) together with the first power terminal (2031). A power circuit, a sampling circuit, and an equalizer circuit are integrated into the backplane (203), and the power circuit, the sampling circuit, and the equalizer circuit are connected after the second power terminal (2011) is plugged and docked with the first power terminal (2031). The BMS (204) is connected to the backplane (203) for managing the energy storage system.