A battery stack method and system. The battery stack system at least includes a controller, a base support, and a stacking table and a grabbing apparatus that are disposed on the base support. The battery stack method includes: in response to that a tray on the stacking table is in place, determining battery cell information stored in the tray; determining battery cell information of a target battery cell on a battery cell conveying line; and in the case that the battery cell information stored in the tray matches the battery cell information of the target battery cell, controlling the grabbing apparatus to grab the target battery cell and place the target battery cell in the tray.