NOVELTY - The backsheet (101) has a recessed seat formed with a through-hole (110) that is matched with an inner side of a face of each integrated conductive element (130a-d) in correspondence of each terminal point of a front circuit (124a-d) and of an opposite back electrical connection point. Each terminal point of the front circuit is electrically connected to each integrated conductive element in an irreversible way. The face of each integrated conductive element faces a back side to enable electrical connection to a junction box (141), and is visible and accessible through the through-hole.    USE - Backsheet e.g. non-conductive and conductive backsheet, for photovoltaic panels (claimed) with back-contact type cells of crystalline silicon, which integrates in an integral way conductive interface elements intended to electrically connect terminal points of a front electrical circuit to a back junction box in an industrial sector.    ADVANTAGE - The backsheet has high production flexibility, and facilitates electrical connection of the junction box placed on the back side of the photovoltaic panel after the rolling phase composed by back-contact solar cells or standard cells with low costs, high precision, better repeatability, easy control effect, and prolonged service life, and eliminates manual operations in the electrical connection of the back box allowing for contacting by contact of the reversible type. The backsheet can be automatically assembled with the photovoltaic panels arranged for simplified electrical connection in a way to obtain high production capacity for the carrying out operation of electrical connection in a reduced occupation surface. The backsheet allows elimination of known faults linked to the manual operations of holing, insertion and processing of conductive elements in the backsheet, made in an automatic way without affecting the production cycle in evolved systems of production of panels with cells of the back-contact type, and is provided with integrated encapsulating and dielectric layers so as to ensure reduction in industrial costs and increase value on a product for manufacturer of photovoltaic panels to provide renewable energy sources in a required manner.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for assembling a backsheet for photovoltaic panels with back-contact cells of crystalline silicon, which integrates in an integral way conductive elements.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a photovoltaic panel with cells of crystalline silicon of a standard type fully assembled backsheet.    Non-conductive backsheet (101)    Through-hole (110)    Front circuit (124a-d)    Integrated conductive element (130a-d)    Junction box (141)