Laminated busbar for energy storage device

In a module from an electrical battery, a laminated busbar interconnects prismatic electrical cells that are configured to be arranged in cell groups of the same number of cells. The busbar comprises:a first electrically conductive layer, with at least one electrically conducting element, each configured to connect electric poles of two adjacent cell groups,a first electrically insulating layer, laminated on the first conductive layer,a first electrical connector, configured to be connected to a first cell group,a second electrically conductive layer laminated onto the first insulating layer and comprising a second electrical connector to be connected to a last cell group, anda third electrical connector located closer to the first electrical connector than to the second electrical connector.The first insulating layer comprises a cut-out window, configured to allow electrical connection of the second electrical connector with the last cell group.