a sealed battery including : an electrode assembly 11 having multiple positive electrode substrates exposed at one end and negative electrode substrates exposed at the other end ; and collectors 18 1 and collector receiving parts 18 3 that are resistance - welded on both sides of the multiple positive or the multiple negative electrode substrates or both , grooves 23 being formed around the resistance - welded portion of at least one of the collector 18 1 and the collector receiving part 18 3 . due to the spattered particles 26 generated during the resistance - welding being captured within the grooves 23 , few particles burst into the inside of the electrode assembly 11 or into the outside .