Abstract: An electrochemical apparatus includes a positive electrode. The positive electrode includes a current collector, a conductive layer, and an active substance layer, with the conductive layer disposed between the current collector and the active substance layer, where the conductive layer includes secondary particles formed from primary particles of a conductive agent, and D50 of the secondary particles satisfies 0.1 ?m?D50?0.4 ?m. The thickness of the conductive layer in the positive electrode of the electrochemical apparatus is less than 1 ?m, effectively increasing the compacted density and energy density of the electrochemical apparatus.

Abstract: An electrochemical device includes an electrode plate, the electrode plate includes: a first current collector; a first tab protruding from the first current collector; a first active material layer disposed on at least one surface of the first current collector; and an insulation layer disposed along a side edge of the first current collector towards the first tab and abutted against the first active material layer. The insulation layer includes a first region and a second region, the first region is disposed towards the first tab, the second region is disposed away from the first tab and abutted against the first active material layer, and a thickness of the first region of the insulation layer is less than a thickness of the second region of the insulation layer.