ELECTRIC STORAGE DEVICE, ELECTRIC STORAGE SYSTEM, AND MANUFACTURING METHOD THEREOF

摘要

An electric storage device includes: a rolled electrode assembly 10 formed by winding a positive electrode, a negative electrode, and a separator so as to have curved portions and linear portions; current collectors 7; and an electrolyte solution 3. A positive electrode substrate has at one end 10A an unformed portion 11E formed without a positive electrode mixture layer, and a negative electrode substrate has at the other end 10B an unformed portion 13E formed without a negative electrode mixture layer. The current collectors 7 are connected respectively to at least part of the linear portions in the unformed portion of the positive electrode at the one end 10A and that of the negative electrode at the other end 10B. The one end 10A in the positive electrode has a length greater than the winding length, and/or the other end 10B in the negative electrode has such a length.

主权项

1. An electric storage device comprising:
a housing; an electrode assembly in roll form housed in the housing, the electrode assembly being formed by winding a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode so as to have curved portions and linear portions continuous with the curved portions; current collectors housed in the housing, the current collectors being connected respectively to the positive electrode at one end in a direction of a winding axis of the electrode assembly and to the negative electrode at the other end in the direction of the winding axis of the electrode assembly; and an electrolyte solution housed in the housing, wherein the positive electrode includes a positive electrode substrate and a positive electrode mixture layer formed on the positive electrode substrate in a region excluding one end of the positive electrode substrate, the negative electrode includes a negative electrode substrate and a negative electrode mixture layer formed on the negative electrode substrate in a region excluding the other end of the negative electrode substrate, the positive electrode substrate has at its one end an unformed portion in which the positive electrode mixture layer is not formed, the negative electrode substrate has at its other end an unformed portion in which the negative electrode mixture layer is not formed, the current collectors are connected respectively to at least part of the linear portions in the unformed portion of the positive electrode at the one end and to at least part of the linear portions in the unformed portion of the negative electrode at the other end, and the one end in the positive electrode has a length greater than the winding length, and/or the other end in the negative electrode has a length greater than the winding length.