BATTERY PACK

摘要

Provided is a battery pack with the heat buildup associated with battery damage can be reduced while increasing the battery capacity. This invention provides a battery pack having an array of power-generating elements comprising rechargeable single batteries. Each single battery comprises a casing and an electrode body in the casing. In the electrode body, the outermost circumference of the negative electrode is outside the outermost circumference of the positive electrode. The power-generating element further comprises a protection plate placed along the outer surface of the single battery. The protection plate has a metal layer and an insulating layer. The metal layer has first and second surfaces on the single battery side and on the side opposite from the first surface, respectively. The insulating layer is placed on the second surface side of the metal layer. The metal layer is electrically connected to the positive electrode with a given positive potential.

主权项

1. A battery pack in which a plurality of power-generating elements are arrayed, with each element comprising a rechargeable single battery, wherein
the single battery comprises a casing and an electrode body housed in the casing, the electrode body is a wound electrode body in which a positive electrode sheet, a negative electrode sheet and a separator sheet placed between the positive and negative electrodes are wound together, in the wound electrode body, the outermost circumferential portion of the negative electrode is outside the outermost circumferential portion of the positive electrode, the power-generating element further comprises a protection plate placed along the outer surface of the casing of the single battery, the protection plate has a metal layer and an insulating layer, the metal layer has a first surface located on the single battery side and a second surface located opposite from the first surface, the insulating layer is placed on the second surface side of the metal layer, and the metal layer is electrically connected to the positive electrode and the metal layer is thereby given with a positive potential.