Flat-wound electricity storage device cell and flat-wound electricity storage device module

摘要

A cathode terminal includes a cathode collector foil connector connected to the blank of a cathode collector foil, a cathode terminal external lead-out portion, and an intra-cell cathode terminal radiator located between the cathode collector foil connector and the cathode terminal external lead-out portion and covering approximately half of one of the wide side surfaces of a flat-wound electrode portion. An anode terminal includes an anode collector foil connector connected to the blank of an anode collector foil, an anode terminal external lead-out portion, and an in-cell anode terminal radiator located between the anode collector foil connector and the anode terminal external lead-out portion and substantially covering a remaining portion of the one of the wider side surfaces of the flat-wound electrode portion.

主权项

1. A flat-wound electricity storage device cell, comprising:
a flat-wound electrode portion formed by winding a cathode in a strip shape, in which a cathode electrode layer is formed on a cathode collector foil, and an anode in a strip shape, in which an anode electrode layer is formed on an anode collector foil, into a flat shape so as to sandwich a separator in a strip shape having an electric insulation property therebetween; a sealed container for impregnating the flat-wound electrode portion with an electrolyte, and sealing and storing the flat-wound electrode portion; and a cathode terminal and an anode terminal which are electrically insulated from the sealed container and connected respectively to the cathode collector foil and the anode collector foil, wherein: the cathode collector foil includes a blank left without the cathode electrode layer being formed at a position where the anode collector foil does not overlap when the cathode electrode layer is laid on the anode electrode layer; the anode collector foil includes a blank without the anode electrode layer being formed at a position where the cathode collector foil does not overlap when the anode electrode layer is laid on the cathode electrode layer; the cathode terminal includes a cathode collector foil connector connected to the blank of the cathode collector foil, a cathode terminal external lead-out portion extending outside from the sealed container, and an intra-cell cathode terminal radiator located between the cathode collector foil connector and the cathode terminal external lead-out portion and covering a part of one of wider side surfaces of the flat-wound electrode portion; and the anode terminal includes an anode collector foil connector connected to the blank of the anode collector foil, an anode terminal external lead-out portion extending outside from the sealed container, and an intra-cell anode terminal radiator located between the anode collector foil connector and the anode terminal external lead-out portion and covering a remaining portion of the one of the wider side surfaces of the flat-wound electrode portion; further comprising, within the sealed container sealing and storing the flat-wound electrode portion: an inter-terminal electric insulation plate provided between the intra-cell cathode terminal radiator and the intra-cell anode terminal radiator to separate the intra-cell cathode terminal radiator and the intra-cell anode terminal radiator from each other; and a step-absorbing electric insulation plate provided on the one of the wider side surfaces of the flat-wound electrode portion which is not covered by the intra-cell cathode terminal radiator, wherein a thickness of the step-absorbing electric insulation plate is approximately the same as respective thicknesses of the intra-cell cathode terminal radiator and the intra-cell anode terminal radiator.