Electric coupling of a connection to an electrochemical bundle

Method of electric coupling of a plane connection to electrodes of the same polarity of an electrochemical bundle comprising an alternating sequence of at least one positive electrode and at least one negative electrode framing a separator, each electrode comprising a metal strip less than 50 μm thick, serving as current collector, at least one surface of which is coated with a paste containing an electrochemically active material, the method comprising the following steps:

• at least one positive electrode, at least one negative electrode and at least one separator are put together to form an electrochemical bundle in order to let a lateral band of said electrodes of opposite polarity respectively protrude from opposite ends of said bundle,
• a pressure is exerted on the section of said lateral bands of the electrodes of the same polarity in order to fold them, the folding of the lateral bands being carried out by repeated flattening of said bands by small successive passes of a hammer over the same surface, the surface flattened by one pass of the hammer over the surface being comprised between 20 and 50 mm2,
• a plane connection is welded to abase constituted by said folded lateral bands.