NON-AQUEOUS RECHARGEABLE BATTERY
A non-aqueous rechargeable battery includes an electrode body in which a positive plate and a negative electrode plate are stacked in a stacking direction with a separator arranged in between. The positive electrode plate includes a positive electrode substrate, and a positive electrode mixture layer and an insulating layer arranged on each of two opposite surfaces of the positive electrode substrate. The positive electrode substrate includes a positive electrode uncoated portion. The electrode body includes a positive electrode current collector portion in which layers of the positive electrode uncoated portion are stacked in the stacking direction. A first insulating layer on a first surface of the positive electrode substrate, facing a center of the positive electrode current collector portion in the stacking direction, has a thickness that is greater than that of a second insulating layer on a second surface of the positive electrode substrate opposite to the first surface.
1 . A non-aqueous rechargeable battery, comprising:
an electrode body in which a positive electrode plate and a negative electrode plate are stacked in a stacking direction with a separator arranged in between, wherein
the positive electrode plate includes
a foil-like positive electrode substrate, and
a positive electrode mixture layer and an insulating layer arranged on each of two opposite surfaces of the positive electrode substrate;
the positive electrode substrate includes a positive electrode uncoated portion free from the positive electrode mixture layer and the insulating layer;
the electrode body includes a positive electrode current collector portion in which layers of the positive electrode uncoated portion are stacked in the stacking direction;
the insulating layer is located between the positive electrode mixture layer and the positive electrode uncoated portion;
the insulating layer on a first surface of the positive electrode substrate defines a first insulating layer, the first surface facing a center of the positive electrode current collector portion in the stacking direction;
the insulating layer on a second surface of the positive electrode substrate opposite to the first surface defines a second insulating layer; and
the first insulating layer has a thickness that is greater than that of the second insulating layer.
2 . The non-aqueous rechargeable battery according to claim 1 , wherein the thickness of the first insulating layer is in a range of 1.2 to 1.7 times the thickness of the second insulating layer.
3 . The non-aqueous rechargeable battery according to claim 2 , wherein
the thickness of the first insulating layer is in a range of 5.0 μm to 20.0 μm, and
the thickness of the second insulating layer is in a range of 3.0 μm to 16.0 μm.
4 . The non-aqueous rechargeable battery according to claim 1 , wherein
the insulating layer includes a binder, and
a mass ratio of the binder to a mass of the insulating layer is in a range of 10 mass % to 30 mass %.
5 . The non-aqueous rechargeable battery according to claim 1 , wherein the first insulating layer and the second insulating layer each have a width in a range of 2.5 mm to 4.5 mm.