Data monitoring method and data monitoring device for energy storage system

The invention provides a data monitoring method and a data monitoring device for an energy storage system, which are applied to a data monitoring system, the data monitoring system comprises a cloud platform and an energy storage system, the energy storage system comprises energy storage equipment and edge equipment, and the data transmission efficiency is improved. The method comprises the following steps: the cloud platform initiates a message queue telemetry transmission (MQTT) connection request to an edge device, and the edge device keeps communicating with an energy storage device so as to establish an MQTT connection with the energy storage system; the cloud platform confirms to establish the MQTT connection under the condition of receiving connection confirmation information from the edge equipment; the cloud platform sends a subscription request to the edge device, wherein the subscription request is used for acquiring the energy storage data of the energy storage device; and the cloud platform recei