ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE

An electrochemical device includes a housing, an electrode assembly, a first tab and a second tab. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The first electrode plate includes a first current collector. The second electrode plate includes a second current collector and a plurality of conductive sheets. The plurality of conductive sheets protrude from the second current collector. The plurality of conductive sheets are stacked to form a collection portion. The first tab is connected to the first current collector. The second tab is connected to the collection portion. A conductivity of the first tab is g1 S/mm. A cross-sectional area of the first tab is s1 mm2. A conductivity of the plurality of conductive sheets is g2 S/mm. A sum of cross-sectional areas the plurality of conductive sheets is s2 mm2, and 0.8 ≤ (g1 × s1)/(g2 × s2) ≤ 1.2.