Method of manufacturing battery pack

A method of manufacturing a battery pack including a battery stack that is housed in a battery case, the method comprising:

• arraying first and second battery cells adjacently to each other in the battery stack, in which a first terminal that is a positive or negative external terminal of the first battery cell is provided on an end face of the first battery cell, and a second terminal that is a positive or negative external terminal of the second battery cell and that is paired with the first terminal is provided on an end face of the second battery cell facing the end face of the first battery cell;
• applying a constraining load to the battery stack from both side faces in a direction of array of the first and the second battery cells, in which the constraining load is applied to the battery stack in a state in which the first terminal and the second terminal are in contact with each other;
• and
• housing the battery stack in the battery case, the battery stack being housed in the battery case in a state in which the first terminal and the second terminal are in contact with each other and also in a state in which the constraining load is applied.