Battery pack box body and battery pack

The utility model provides a battery pack box body and a battery pack, the battery pack box body comprises a shell, an accommodating space for accommodating a battery module is formed, a main air duct extending along the length direction of the shell is formed in the shell, and an air outlet communicated with the main air duct is formed in a front end plate; the battery pack box further comprises a battery module supporting plate, the battery module supporting plate is arranged on the bottom plate and used for supporting a battery module, a bottom air channel communicated with the outside is formed between the battery module supporting plate and the bottom plate, and the battery module supporting plate is arranged on the bottom plate and used for supporting the battery module. A bottom air inlet is formed in the position, corresponding to the main air duct, of the battery module supporting plate, and the bottom air duct is communicated with the main air duct through the bottom air inlet. According to the sche