Battery cell baking method, battery cell manufacturing method and battery manufacturing method

The invention belongs to the field of manufacturing methods of secondary batteries, and particularly relates to a baking method of a battery cell. In order to solve the technical problem that in the prior art, in the baking process after preheating, the clamping force of a clamp is not changed all the time, so that the evaporation rate of moisture in a battery cell is still low, namely the moisture content of the battery cell is still high, the invention provides the baking method of the battery cell, and in the baking process after the battery cell clamped with the clamp is fed into a drying device, the clamping force of the clamp is not changed all the time. The air pressure in the drying device is subjected to vacuum degree conversion, and when the vacuum degree in the drying device is relatively high, the battery cell is clamped by the clamp, so that the pole piece is prevented from being wrinkled or broken; and when the vacuum degree in the drying device is relatively low, the clamping force of the clamp