Battery module

A battery module comprising:

• a plurality of rechargeable batteries arranged side by side, wherein each of the rechargeable batteries includes a battery case, and the battery case includes a wall having a release valve configured to open when an internal pressure of the battery case increases to a threshold value;
• and
• a battery cover opposed to the wall of at least one of the rechargeable batteries such that the battery cover covers the release valve of the at least one rechargeable battery to reduce the leakage of emissions from the at least one rechargeable battery through the battery cover, wherein:
• the battery cover includes a plurality of cover members arranged side by side in a layout direction of the plurality of rechargeable batteries;
• the plurality of cover members include at least a first cover member and a second cover member that are adjacent to each other;
• the first cover member includes a first edge;
• and
• the second cover member includes a second edge that overlaps the first edge.