Composite heat dissipation device for lithium ion battery and lithium ion battery system

The utility model provides a composite heat dissipation device for a lithium ion battery and a lithium ion battery system, which are novel in structural design. Comprising a heat dissipation machine body, a heat dissipation side box and a shell, one side of the shell is installed on the outer wall of the heat dissipation machine body through bolts, a blocking and pulling plate is slidably connected to the inner wall of the shell, a plurality of sector nets are installed on the outer wall of the blocking and pulling plate through bolts, a steering rod is movably connected to the middle of the outer wall of the blocking and pulling plate through a bearing, and a heat dissipation round frame is welded to one end of the steering rod; an adjusting handle is welded to the outer wall of the heat dissipation round frame, a plurality of local nets are installed on the outer wall of the heat dissipation round frame through bolts, an inserting plate is welded to one side of the heat dissipation side box, and inner conne