LIQUID INJECTION DEVICE, BATTERY PRODUCTION LINE AND LIQUID INJECTION METHOD

A liquid injection device comprises a liquid injection apparatus comprising: a battery clamp provided with at least one battery accommodating groove having a set position therein, a position adjustment mechanism configured to be capable of adjusting a battery that has been put in the battery accommodating groove and not located at the set position to the set position, and a liquid injection mechanism configured to be capable of butting to a liquid injection port of the battery located at the set position, and performing a liquid injection operation of injecting an electrolyte into the battery. For a battery that is not located at the set position, position adjustment is performed with the position adjustment mechanism such that the battery moves to the set position.