On August 9, Nandu Power said on the investor interaction platform that the 690Ah Super launched by the company special battery for large capacity energy storage compatible with the capacity of 650Ah to 750Ah, it has 20 years super long service life, the volume energy density reaches 380-440wh/L, the cycle life reaches 15000 times, the monomer energy exceeds 2 degrees of electricity, and the energy efficiency exceeds 96%, large-scale production lines are under construction. The sodium ion battery developed by the company adopts high stability sodium positive electrode and high compaction hard charcoal negative electrode, energy density 140Wh/kg, cycle life 3000 times, support 5C charge and discharge and-40 ℃ extremely cold environment, capacity for mass production.