Introduction  Under the background of new infrastructure， data centers have developed rapidly. As a high-density load， how to maximize the use of clean energy and reduce operating energy consumption has been more concerned in data centerprojects.

  Method  The main battery technical parameters of energy storage system and the power supply requirements of the data center were given in the paper.

  Result  Through battery parameter analysis， recommendations for battery selection suitable for data center energy storage systems are given， and then the application modes for data center energy storage systems and the energy storage system topology with the fast switching function are proposed.

  Conclusion  We verify the effectiveness of this technical solution through typical project case.