Energy management system

An energy management system, comprising:

• a data acquisition layer configured to obtain and analyze original data of one or more access devices to obtain analyzed data, each access device being a device of an energy storage system;
• a data storage layer configured to store the analyzed data outputted by the data acquisition layer;
• and
• a data management layer configured to send the analyzed data stored in the data storage layer to a client server or a third-party server according to a sending request or configuration information;
• wherein, the data acquisition layer comprises:
• a first communication device configured to establish a first communication link and a second communication link with each access device;
• and
• a first load balancing device configured to control a communication status of the first communication device, so that each access device communicates with the first communication device through the first communication link in a case that a communication flow of the first communication device is less than a first threshold value, and so that each access device communicates with the first communication device through both the first communication link and the second communication link in a case that the communication flow of the first communication device is greater than or equal to the first threshold value.