NOVELTY - A battery system comprises battery cells arranged in a sequence, each battery cell having a first voltage terminal and second voltage terminal, where the first voltage terminals of the plurality are arranged in a row; and a bimetallic busbar having a first segment joined to a second segment, the first segment made of a first metal and the second segment made of a second metal that is different from the first metal.    USE - The battery system is used in terrain, marine, or aeronautic vehicle and in electric utility companies.    ADVANTAGE - The present invention provides battery modules and scalable architectures for manufacturing battery modules.    DETAILED DESCRIPTION - A battery system comprises battery cells arranged in a sequence, each battery cell having a first voltage terminal and second voltage terminal, where the first voltage terminals of the plurality are arranged in a row; and a bimetallic busbar having a first segment joined to a second segment, the first segment made of a first metal and the second segment made of a second metal that is different from the first metal, where the first segment includes a first u-shaped bend defining a first channel into which the first terminal of one of the battery cells is positioned, and where the second segment includes a second u-shaped bend defining a second channel into which the first terminal of another one of the battery cells is positioned. INDEPENDENT CLAIMS are:    (1) a method of manufacturing a battery by supplying a busbar having a U-shaped portion defining a channel and characterized by a bend corner at one end of the U-shaped portion, the busbar also having a reduced reflectivity treatment at least in the vicinity of the bend corner; positioning a single battery terminal in the channel formed by the U-shaped portion so that the top end of the terminal is proximate to the bend corner; directing a laser beam at the bend corner of the U-shaped portion; and with the laser beam, melting the busbar at the bend corner and forming a metallurgical bond between the busbar and the top end of the single terminal; and    (2) a battery comprising a battery cell having a voltage terminal; a busbar having a U-shaped portion defining a channel and characterized by a bend corner at one end of the U-shaped portion, the busbar also having a reduced reflectivity treatment at least in the vicinity of the bend corner, where the voltage terminal extends into the channel formed by the U-shaped portion and has a top end that is proximate to the bend corner; and a metallurgical junction formed between the top end of the terminal and the busbar inside the channel at the bend corner.    DESCRIPTION OF DRAWING(S) - The drawing shows a side profile of a busbar jumper.    Busbar jumper (700)    Copper portion (701)    Aluminum portion (702)    Bend (703)    Inside surface (704)    Linear weld (705)    Angle of attack (708)