▎ 摘　　要

NOVELTY - The collector comprises an intermediate layer has a first surface and a second surface opposite to the first surface. The intermediate layer is an ion conductor of electronic insulation, where the porosity of the middle layer is greater than 0% and less than or equal to 50%. A first metal layer is arranged on the first face. A second metal layer is arranged at the second face. The through holes are provided on both the first metal layers and the second metal layers. The hole is provided on the inner wall of the second surface adjacent to the intermediate layer. The portion of the hole is adjacent to a portion of a first metal sheet and/or the portion of second metal sheet. USE - Composite current collector for use in a composite pole piece and electrochemical device i.e. lithium ion battery, of an electric automobile and a mobile electronic device. ADVANTAGE - Because the middle layer is an ion conductor, the exposed part through the hole can effectively form an ion path connected with two side active substance, improving the ion conduction capability. In addition, the composite pole piece increases the ion-conduction path, which is good for ensuring the positive and the capacity of the cathode active substance to further improve the energy density and the electrical performance of the electrochemical device. Because the active substance anode layer can cover part or all of the exposed portion of the first surface, and the layer of the second surface, the active material anode and the active substances can be set on the first metal layer and the second metal layer, respectively, so that the ion conductivity of the composite current collector can be improved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a composite pole piece; (2) an electrode assembly; (3) an electrochemical device. DESCRIPTION OF DRAWING(S) - The drawing shows A is a cross-sectional view of the structure example of the composite current collector. 3Repeating charging/discharging 6Holes 10Composite current collector