The coating mechanism includes a coating head and a speed increasing mechanism. The coating head is provided with an accommodating cavity; a cavity wall of the accommodating cavity is provided with a feed inlet and a discharge outlet. At least a part of the speed increasing mechanism is located in the accommodating cavity; the speed increasing mechanism is configured to distribute a slurry entering from the feed inlet in a first direction, the first direction intersecting with a discharge direction of the discharge outlet. The slurry enters the accommodating cavity of the coating head via the feed inlet and is applied onto an electrode plate via the discharge outlet. Utilizing a part of the speed increasing mechanism located in the accommodating cavity can increase the flow velocity of the slurry in the accommodating cavity; so, the flow velocity of the slurry in the accommodating cavity is actively increased