US Patent 10177348 Nonaqueous electrolyte secondary battery and pack battery

A nonaqueous electrolyte secondary battery includes a wound electrode body housed in a battery case. The wound electrode body is positioned to the battery case with a positioning member. Among a spatial volume excluding the wound electrode body in the battery case, in a direction of a winding axis of the wound electrode body, a spatial volume X on a negative electrode side of the battery case is larger than a spatial volume Y on a positive electrode side of the battery case. Here, the spatial volume X and the spatial volume Y satisfy 2.1≤(X/Y)≤5.7.