NOVELTY - The battery (10) has wound electrode assembly (11) that is housed in rectangular outer can (12) such that direction of winding axis of electrode assembly is approximately parallel with sealing plate (13). First area of negative electrode collector (18) is welding-connected to outermost surface of narrow portion of negative electrode exposed portion (15). Second area is placed in approximate-parallel with side wall of can. The second area is placed at side of side wall of can which is closer than first area. Rib is formed in first area and at end of central side of electrode assembly.    USE - Sealed battery used for electric vehicles (EVs) and hybrid electric vehicles (HEVs) using fossil fuels such as petrol, diesel oil and natural gas.    ADVANTAGE - The reliability of the sealed battery can be increased with low occurrence of internal short-circuits. The electricity loss inside the battery can be prevented and hence the heat emission can be reduced. The internal resistance can be lowered by preventing welding faults between the substrates. Since the movement of spattered particles provided into the interior of the electrode assembly is prevented when collectors are resistance-welded to the substrates.    DETAILED DESCRIPTION - The positive electrode substrate exposed portions (14) and negative electrode substrate exposed portions are provided at the ends of flat-shaped wound electrode assembly. The positive and negative electrode collectors are connected to the positive and negative electrode substrate exposed portions, respectively. The second area of the negative electrode collector is protruded to a side of the sealing plate over/more than the side end of the sealing plate at an end of the wound negative electrode substrate exposed portion. The first area is connected with the second area through third area of the negative electrode collector.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of sealed battery.    Sealed battery (10)    Wound electrode assembly (11)    Rectangular outer can (12)    Sealing plate (13)    Positive electrode substrate exposed portion (14)    Negative electrode substrate exposed portions (15)