Patent ID: 8828590

Claim:
An electric storage device, comprising: a case; an electrode assembly housed in the case and including a positive electrode plate and a negative electrode plate which are wound together while being isolated from each other; an external terminal arranged outside the case; and a current collecting member arranged inside the case to electrically connect the electrode assembly with the external terminal, wherein the current collecting member comprises: a first portion including a first end portion and a second end portion and electrically connected to the external terminal; and a second portion extending out of the second end portion of the first portion and electrically connected to the electrode assembly, and wherein the second portion comprises: a base portion including a first end portion and a second end portion, the first end portion of the base portion being connected to the second end portion of the first portion; a twisted portion including a first end portion and a second end portion, the first end portion of the twisted portion being connected to the second end portion of the base portion; an insertion portion including a first end portion and a second end portion, the first end portion of the insertion portion being connected to the second end portion of the twisted portion, the insertion portion being inserted into a winding center of the electrode assembly and electrically connected to the electrode assembly; a reverse-twisted portion twisted in a direction opposite to the twisting direction of the twisted portion and including a first end portion and a second end portion, the first end portion of the reverse-twisted portion being connected to the second end portion of the insertion portion; and a leading end portion including an end portion, the end portion of the leading end portion being connected to the second end portion of the reverse-twisted portion, wherein a pair of combinations each including the twisted portion, the insertion portion, and the reverse-twisted portion is provided at intervals to one another, and wherein the leading end portion couples the second end portions of the pair of reverse-twisted portion with each other.