Automobile cell and related method

摘要

An automobile cell is provided with an electric power generating element composed of a positive electrode having a positive electrode active substance layer, a negative electrode having a negative electrode active substance layer and a separator interposed between the electrodes, a cell outer sheath made of a laminate film compositely composed of polymer and metal, a positive electrode terminal lead electrically conductive with the positive electrode and extending to an outside of the cell outer sheath, and a negative electrode terminal lead electrically conductive with the negative electrode and extending to the outside of the cell outer sheath. The positive electrode and the negative electrode associated therewith via the separator defines a unit electrode, and the relationship between a thickness of the automobile cell and a sum of a thickness of the positive electrode active substance layer and a thickness of the negative electrode active substance layer of the unit electrodes, is defined such that a value obtained by dividing the former by the latter is equal to or less than 80.

主权项

1. A flat-shaped cell for an automobile, the cell comprising:
an electric power generating element made flat-shaped cell by laminating a positive electrode provided with a positive electrode current collector and a positive electrode active substance layer formed on the positive electrode current collector, a separator, and a negative electrode provided with a negative electrode current collector and a negative electrode active substance layer formed on the negative electrode current collector; a cell outer sheath made of a polymer-metal composite laminate film for sealing the electric power generating element therein; a positive electrode terminal lead electrically connected with the positive electrode and extended outward from the cell outer sheath; a negative electrode terminal lead electrically connected with the negative electrode and extended outward from the cell outer sheath, wherein the electric power generating element is sealed in the cell outer sheath by forming welded portions along a circumferential edge of two sheets of the laminate films or by forming welded portions for sealing an opening of an envelope made of one sheet of the laminate film, the positive electrode current collector and the negative electrode current collector are made of foil, the positive electrode terminal lead is extended outward from the cell outer sheath with sandwiched between the welded portions, the negative electrode terminal lead is extended outward from the cell outer sheath with sandwiched between the welded portions, the positive electrode terminal lead and the negative electrode terminal lead are plate-shaped, a ratio of a total thickness of the cell to a sum of a thickness of a single layer of the positive electrode active substance layer and a thickness of a single layer of the negative electrode active substance layer is equal-to or smaller-than 80, a ratio of a thickness of the positive electrode terminal lead to a total thickness of the positive electrode current collector is equal-to or larger-than 0.4 and equal-to or smaller-than 2.0, and a ratio of a thickness of the negative electrode terminal lead to a total thickness of the negative electrode current collector is equal-to or larger-than 0.4 and equal-to or smaller-than 2.0.