Current collector for non-aqueous electrolyte secondary battery, electrode, non-aqueous electrolyte secondary battery, and method for producing the same
OwnerTakuya Nakashima, Hiroshi Temmyoinventors
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Abstract
A current collector includes a metal foil with a plurality of through-holes formed therein. The metal foil is divided into two regions of: a distant region distant from a connection portion to be connected to an external terminal; and a close region being close to the connection portion and having the same area as the distant region. The open area ratio of the distant region of the metal foil is larger than that of the close region. Thus, the electrical resistance of the close region is smaller than that of the distant region. Therefore, production of heat in the close region due to passage of current can be suppressed.
Claims12
A current collector for a non-aqueous electrolyte secondary battery,
- the current collector comprising a metal foil with a plurality of through-holes,
- the metal foil having a current collection region where an electrode active material is supported and a connection portion to be connected to an external terminal,
- the current collection region being divided into two regions of:
- (i) a distant region distant from the connection portion;
- and
- (ii) a close region being close to the connection portion and having the same area as the distant region, and
- the through-holes being distributed so that the open area ratio of the distant region is larger than that of the close region.
A method for producing a current collector for a non-aqueous electrolyte secondary battery, comprising the steps of:
- (a) preparing a metal foil having a current collection region where an electrode active material is supported and a connection portion to be connected to an external terminal;
- and
- (b) forming a plurality of through-holes in the metal foil,
- wherein the step (b) includes distributing the through-holes in the metal foil, which is divided in two regions of:
- (i) a distant region distant from the connection portion;
- and (ii) a close region being close to the connection portion and having the same area as the distant region, in such a manner that the open area ratio of the distant region is larger than that of the close region.
Dependencies are inferred from the claim text.