Bus bar having novel structure and battery module including the same

摘要

Disclosed herein is a bus bar for electrically connecting electrode leads of unit modules or battery cells (unit cells) in a battery module through a coupling method employing laser welding. Each of the electrode leads and the bus bar has a plate-shaped structure and a protrusion projecting toward the electrode leads is formed on the bus bar at a portion thereof, which is to be welded to the electrode leads through laser irradiation, to allow the portion of the bus bar, which is to be welded to the electrode leads, to be brought into close contact with the electrode leads.

主权项

1. A battery module comprising at least two unit modules or at least two unit cells and at least one bus bar for electrically connecting the at least two unit modules or at least two unit cells through a coupling method employing laser welding, wherein:
each unit module or unit cell comprises electrode leads having plate-shaped structure, the at least one bus bar has a plate-shaped structure having a longer dimension and a shorter dimension with two elongated protrusions projecting perpendicularly from the plate-shaped bus bar structure and extending in the direction of longer dimension, and each protrusion projecting towards and contacting a flat portion of a plate-shaped electrode lead, thereby forming a contact surface between the protrusion and the electrode lead, wherein at least one welded joint is formed at the contact surface by irradiating the electrode leads with laser light, thereby welding the protrusion to the flat portion of the plate-shaped electrode lead.