Power battery device

A power battery device, comprising:

• a battery tray having a positioning member provided on the upper surface thereof;
• and
• a plurality of battery modules disposed on the battery tray and arranged in at least two layers in an up-down direction, each battery module comprising:
• a housing having a first positioning portion disposed on the upper surface of the housing and a second positioning portion disposed on the lower surface of the housing;
• a battery disposed within the housing,
• wherein in two adjacent layers of the battery modules, the first positioning portion on the upper surface of the housing in a lower layer the battery modules is matched with the second positioning portion on the lower surface of the housing in an upper layer of the battery modules, and the battery modules in the lowermost layer of the battery modules are positioned by the positioning member;
• the first positioning portion is configured as a positioning projection, and the second positioning portion is configured as a positioning groove adapted for matching with the positioning projection;
• the positioning projection comprises:
• a first positioning projection disposed in the middle of the upper surface of the housing in the front-rear direction;
• and the positioning groove comprises:
• a first positioning groove disposed in the middle of the lower surface of the housing in the front-rear direction;
• the first positioning projection is extended in a left-right of the housing;
• and the first positioning groove is extended in the left-right of the housing;
• the first positioning projection comprises two first sub-protrusions, and the two first sub-protrusions are disposed symmetrically with respect to a centerline of the housing along the left-right direction;
• and
• the first positioning groove comprises two first sub-grooves, and the two first sub-grooves are disposed symmetrically with respect to the centerline of the housing along the left-right direction and one-to-one correspondence with corresponding first sub-protrusions in the up-down direction.