Battery packaging device, battery, energy storage box and injection mold

The invention relates to a battery packaging device, a battery, an energy storage box and an injection mold, the battery is arranged on the energy storage box, the battery packaging device is arranged on the battery, and the injection mold is used for manufacturing the battery packaging device; on the battery packaging device, a first forming space is jointly defined among the bottom of the pole, the groove bottom of the mounting groove and the sealing ring, and a second forming space is defined between the fixing piece and the pole. Furthermore, a first supporting part is arranged in the first forming space in an injection molding manner, a second supporting part is arranged in the second forming space in an injection molding manner, and a peripheral edge part is arranged outside the fixing piece in an injection molding manner, so that the sealing ring can keep enough pre-tightening force through close fit of the injection molding piece and the fixing piece; and the acting force in the longitudinal direction