The invention relates to a method of processing an electrochemical device having at least one carrier substrate (1) provided with a stack (2) of functional layers, including at least one electrochemically active layer (4) which is capable of reversibly and simultaneously inserting ions and electrons and is arranged between two electroconductive layers, in particular a device of the electrochromic type. The processing consists in locally inhibiting the functionality of at least one of the functional layers, with the exception of one of the electroconductive layers (3, 8), so as to delimit an inactive peripheral region in the stack (2).