The invention provides a battery
liquid injection device and a battery
liquid injection method, and relates to the technical field of batteries. The battery
liquid injection device comprises a shell, a liquid injection
pipe and a vacuumizing
assembly, the shell is provided with a cavity, and the shell is configured to be arranged at an opening of a
battery cell of a battery to be injected in a sealed and sleeved mode, so that the cavity is communicated with the interior of the battery to be injected. The liquid injection
pipe comprises a liquid
injection port and a liquid outlet, the liquid injection
pipe penetrates through the shell and extends into the battery to be injected, the liquid
injection port is located outside the shell, and the liquid outlet is located in the battery to be injected. The vacuumizing
assembly is arranged on the shell, and the vacuumizing end of the vacuumizing
assembly communicates with the cavity. The
battery cell opening of the to-be-injected battery is sealed by the shell, the
electrolyte is directly injected into the to-be-injected battery by the
electrolyte injection pipe, a pressurization process is omitted, and the whole
battery cell opening does not need to be exposed to air, so that the injection of the
electrolyte can be realized, and the contact amount and the contact area of the air and the electrolyte can be reduced.