Battery shell corrosion detection method and system and shell corrosion detection device

The invention relates to the technical field of batteries, and discloses a battery shell corrosion detection method, a battery shell corrosion detection system and a shell corrosion detection device. The battery shell corrosion detection method comprises the steps that a battery is provided, the battery comprises a shell, a positive pole and a negative pole, and the shell comprises a bottom shell and a top cover arranged at the top end of the bottom shell in a covering mode; monitoring a first voltage between the positive pole and the negative pole, a second voltage between the positive pole and the shell and a third voltage between the shell and the negative pole in real time; and judging whether the shell is corroded or not according to the first voltage, the second voltage and the third voltage. According to the embodiment of the invention, the external shell is used as a reference electrode and does not need to be implanted into the battery cell, so that the air tightness of the battery can be effectively