LITHIUM-ION RECHARGEABLE BATTERY
A lithium-ion rechargeable battery includes a negative electrode plate including a negative electrode substrate and a negative electrode mixture layer applied to the substrate, a positive electrode plate including a positive electrode substrate and a positive electrode mixture layer applied to the substrate, a separator arranged between the negative electrode plate and the positive electrode plate, and a non-aqueous electrolyte. The negative electrode substrate includes a negative electrode connection portion that projects from the negative electrode mixture layer in a first width direction. The positive electrode substrate includes a positive electrode connection portion that projects from the positive electrode mixture layer in a second width direction. The negative electrode plate has a thickness that increases in the first width direction. The positive electrode plate has a thickness that increases in the second width direction. The separator has a porosity that increases in the second width direction.
1 . A lithium-ion rechargeable battery, comprising:
a negative electrode plate including a negative electrode substrate and a negative electrode mixture layer applied to each of two surfaces of the negative electrode substrate;
a positive electrode plate including a positive electrode substrate and a positive electrode mixture layer applied to each of two surfaces of the positive electrode substrate;
a separator arranged between the negative electrode plate and the positive electrode plate; and
a non-aqueous electrolyte, wherein
the negative electrode substrate includes a negative electrode connection portion that projects from the negative electrode mixture layer in a first width direction and is electrically connected to a negative electrode external terminal,
the positive electrode substrate includes a positive electrode connection portion that projects from the positive electrode mixture layer in a second width direction opposite to the first width direction and is electrically connected to a positive electrode external terminal,
the negative electrode plate has a thickness that increases in the first width direction,
the positive electrode plate has a thickness that increases in the second width direction, and
the separator has a porosity that increases in the second width direction.
2 . The lithium-ion rechargeable battery according to claim 1 , wherein
in the negative electrode plate, the negative electrode mixture layer has a thickness that increases in the first width direction, and
in the positive electrode plate, the positive electrode mixture layer has a thickness that increases in the second width direction.
3 . The lithium-ion rechargeable battery according to claim 1 , wherein the porosity of the separator is such that the porosity at an end in the second width direction is 102% or greater with respect to the porosity at an end in the first width direction.
4 . The lithium-ion rechargeable battery according to claim 1 , wherein the negative electrode plate and the positive electrode plate, when stacked, entirely has a thickness that is constant in a width direction.