Abstract: To cope with the enormous challenges brought by distributed energy storage terminals to the management and operation of the power grid, a battery energy storage system (abbr. BESS) terminal information exchange mechanism based on a universal plug-and-play protocol was proposed. Firstly, based on the modeling method of electric power Internet of Things(abbr. IoT) standard, a model pattern specifications with three dimensions of BESS attributes, services, and events were defined to construct an IoT terminal model applicable to BESS on the distribution side, which eliminates the heterogeneity problem between cloud master and terminal model in the traditional system. Secondly, a registration/identification mechanism between the BESS terminal and cloud master station based on a common plug-and-play protocol was proposed: based on the self-describing configuration of the BESS terminal, identity verification was completed by obtaining certificate or authentication of the cloud master station to ensure data security, so as to achieve fast identification and connection. Finally, a cloud edge-based BESS information exchange mechanism was constructed taking the model and protocol mapping as the core. And taking the energy storage system in a certain distribution network feeder as an example, the feasibility and effectiveness of the information interaction between the BESS terminal and the cloud master station’s various business function information are verified by consistency testing.