Dry powder coating method, pole piece produced by method and lithium ion battery

The invention provides a dry powder coating method, a pole piece produced by the method and a lithium ion battery. The method comprises the following steps: 1) carrying out dry mixing on an active main material, a conductive agent and a binder to obtain a dry mixed powder, charging the dry mixed powder, and spraying the dry mixed powder onto a foil to obtain a coated foil; and 2) rolling the coated foil to obtain the pole piece. In the rolling process, heating plates are arranged on the two surfaces of the coated foil, the heating plates are located between a roller and the coated foil, and the heating plates are preheated before rolling. According to the dry powder coating method provided by the invention, the heating plates are arranged on the two sides of the coated foil, the foil is clamped by the heating plates to be heated and rolled, and a molten adhesive is adhered to a steel plate so that cleaning is convenient and operation is more convenient. And the contact time of the heating plates and the pole