Length-adjustable inter-bus bar

An inter-bus bar comprising:

• a first bus bar made of a conductive material, the conductive material extending from a first end of the first bus bar to a second end of the first bar, the first bus bar including a first body region and a first length adjusting region integral to the first body region, the first body region including a first fastening hole positioned at the first end of the first bus bar, the first length adjusting region extending along a first axis out from the first body region to the second end of the first bus bar by a first predetermined length;
• and
• a second bus bar made of the conductive material, the conductive material extending from a first end of the second bus bar to a second end of the second bar, the second bus bar including a second body region and a second length adjusting region integral to the second body region, the second body region including a second fastening hole positioned at the first end of the second bus bar and a second length adjusting region extending along the first axis out from the second body region to the second end of the second bus bar by a second predetermined length, the second bus bar being removably couplable to the first bus bar,
• wherein the first length adjusting region and the second length adjusting region are configured to be removably coupled to each other at different relative positions, wherein the first length adjusting region and the second length adjusting region are at least partially overlapped with each other when coupled, and wherein a length of the partial overlap between the first length adjusting region and the second length adjusting region is adjustable, and
• wherein the inter-bus bar is configured to electrically connect two adjacent battery modules to each other.