Deep sea pressure compensation type oil-filled battery

The invention discloses a deep-sea pressure compensation type oil-filled battery, which belongs to the technical field of deep-sea batteries and comprises a battery cabin filled with hydraulic oil, a battery cell and a spherical leather bag are arranged in the battery cabin, and a leather bag joint for communicating the interior of the spherical leather bag with the outside is arranged on the spherical leather bag. A mounting hole for the leather bag joint to extend out and a water sealing joint connected with the battery cell are arranged on the outer wall of the battery cabin body; and the mounting hole and the leather bag joint are sealed through a sealing piece. Compared with a traditional deep-sea battery adopting a sheet-shaped leather bag, the deep-sea battery adopts the spherical leather bag, the spherical leather bag is connected with the battery cabin body through the leather bag connector, so that only the leather bag connector and the mounting hole are arranged at the position, needing to be seale