The invention discloses a container battery energy storage unit, a battery pack module, bus controller, Fire module, bidirectional converter, a grid-connected module and a transformer are respectivelylocated on both sides of the container body, and an inspection channel is left between the two groups of the battery pack modules. The top plate of the container body directly above the inspection channel is provided with a through groove. The container body is provided with a seal plate for controlling the opening and closing of the through groove, and the top plate of the container body is fixed with a telescopic solar panel. The invention has the advantages that: A telescopic solar panel can be incorporate into that container body during transportation of the container body, At that same time, the seal plate is used to seal the through-groove in the maintenance channel, so as to protect the safety of the whole device in the transportation process. After the transportation is in place,the seal plate is opened and the telescopic solar panel stretches out to work, and the functions of the components in the container body are not affected, thereby effectively improving the safety of the transportation of the container-type battery energy storage unit.