POSITIVE ELECTRODE CURRENT COLLECTOR, POSITIVE ELECTRODE PLATE, ELECTROCHEMICAL DEVICE, AND APPARATUS

The present application discloses a positive electrode current collector (10), a positive electrode plate (30), an electrochemical device, and an apparatus. The positive electrode current collector (10) includes a polymer material-based support layer (101) and an aluminum-based conductive layer (102) disposed on at least one surface of the support layer (101); a thickness D1 of the aluminum-based conductive layer (102), a tensile strength T of the support layer (101), and a thickness D2 of the support layer (101) satisfy a relational formula 0.01 ≤ (200 × D1)/(T × D2) ≤ 0.5, in the formula D1 and D2 are in the same unit, and T is in MPa. The positive electrode current collector (10) has relatively high mechanics and mechanical properties, good electrical conductivity and current collection performance and low weight, which can improve preparation yield of the positive electrode current collector (10), the positive electrode plate (30) and the electrochemical device and their reliability during use, and enables the electrochemical device to have relatively high electrochemical performance and gravimetric energy density.