ELECTROCHEMICAL APPARATUS, ELECTRICAL DEVICE, AND PREPARATION METHOD FOR ELECTROCHEMICAL APPARATUS

An electrochemical apparatus, an electrical device, and a preparation method of an electrochemical apparatus are provided. The electrochemical apparatus includes an electrode assembly. The electrode assembly includes an electrode plate assembly, a first tab, and a second tab. The electrode plate assembly includes a first electrode plate and a second electrode plate. The first electrode plate includes a first current collector and a first active material layer, a first region of a winding tail section of the first current collector is connected to the first tab, and the first current collector includes a first coated region and a first segment located at the winding tail section. The second electrode plate includes a second current collector and a second active material layer, a second region of a winding tail section of the second current collector is connected to the second tab, and the second current collector includes a second coated region and a second segment located at the winding tail section. A sum of equivalent magnetic field strengths of the first current collector F1 and a sum of equivalent magnetic field strengths of the second current collector F2 satisfy: |F1-F2|≤4×10-5, which can better reduce an axial magnetic field at an end face of a wound structure, thereby further reducing interference of the electrochemical apparatus to the electrical device.