BATTERY

A battery including power generation units each including a positive electrode layer, a separator layer, and a negative electrode layer. The area of either one of the positive electrode layer and the negative electrode layer is larger than the area of the other one of the positive electrode layer and the negative electrode layer. The power generation units each has a non-facing region. In the non-facing region, a first penetration portion is placed. The power generation units provided as the pair are stacked along the thickness direction via a first current collector including a second penetration portion corresponding to the first penetration portions. In the power generation units provided as the pair, two separator layers facing each other are fixed by a first fixing portion positioned in the first penetration portion and the second penetration portion.