Coating device, battery and electric device

The invention provides a coating device, a battery and an electric device. The coating device is used for coating a current collector with slurry and comprises a first mold, a second mold and an adjusting assembly. The second mold and the first mold are oppositely arranged in the first direction so as to form a slurry channel allowing slurry to flow. The adjusting assembly comprises a plurality of adjusting components and connecting components; the plurality of adjusting components are arranged in the second direction; the connecting component is in contact with the slurry and extends in the second direction to connect the multiple adjusting components; the second direction is perpendicular to the first direction. Wherein the adjusting assembly is configured to adjust the amount of slurry applied to the current collector by using the connecting member. Therefore, the slurry on the pole piece can be uniformly distributed, and the safety and the chemical performance of the battery are improved. 本申请提供一种涂布装置、电池和用