Electricity storage device and method for manufacturing electricity storage device

A method for manufacturing an electricity storage device, wherein the electricity storage device includes

• an electrode assembly, wherein
• electrodes of different polarities are stacked while being insulated from each other,
• each electrode includes a tab, which protrudes from one side of the electrode, and
• the electrode assembly includes a tab-side end face formed by collecting the sides of the electrodes,
• tab bundles, which protrude from the tab-side end face of the electrode assembly, wherein each tab bundle includes the tabs stacked on one another;
• a case, which accommodates the electrode assembly and the tab bundles;
• electrode terminals, which are secured to a wall portion of the case opposed to the tab bundles and transmit and receive electricity to and from the electrode assembly;
• and
• conductive members, which electrically connect the tab bundles to the electrode terminals and are mounted on the wall portion in a state in which the conductive members are insulated from the wall portion, wherein
• each conductive member includes
• a fixed piece, which overlaps with the wall portion when the wall portion is viewed from an outer surface and includes a first surface and a second surface, which is parallel to the first surface, and
• a connecting piece, which intersects the fixed piece and protrudes in a direction away from the wall portion,
• the method comprising:
• stacking the electrodes of different polarities in a state in which the electrodes are insulated from one another to form the electrode assembly and stacking the tabs;
• mounting the conductive members on the wall portion with the first surface of each fixed piece opposed to the wall portion;
• joining the tabs to a distal end section of each connecting piece in a state in which the tabs are stacked on a first end in a stacking direction of the electrode assembly to form a conduction part that electrically connects the tabs and the associated conductive member;
• and
• after forming the conduction part, folding the distal end section of each connecting piece such that the distal end section of the connecting piece approaches the second surface of the fixed piece to fold the tabs at a section closer to a distal end than the conduction part.