Assembled battery and manufacturing method of assembled battery

A manufacturing method of an assembled battery in which a plurality of single cells are arranged along a prescribed arrangement direction and each of adjacent single cells is electrically connected by a busbar,

• the single cell including an electrode body, an outer package which houses the electrode body, and an electrode terminal which is a plate-shaped conductive member having a first end connected to the electrode body inside the outer package and a second end protruding to the outside of the outer package,
• the busbar including a plate-shaped base portion which is disposed between the electrode terminals of adjacent single cells and which extends along the arrangement direction, a plate-shaped joining projection which extends along a height direction of the single cell and a locking biasing portion which locks the electrode terminal of the single cell and which biases the electrode terminal toward the joining projection being formed at both ends of the plate-shaped base portion in the arrangement direction, wherein the manufacturing method of an assembled battery comprises the steps of:
• bringing the plate-shaped electrode terminal and the plate-shaped joining projection into surface contact with each other, causing the locking biasing portion to lock the electrode terminal of the single cell, and biasing the electrode terminal toward the joining projection using the locking biasing portion;
• and
• welding a tip portion of the electrode terminal and a tip portion of the joining projection to each other.