| 摘要 |
PROBLEM TO BE SOLVED: To provide a bus bar used for a battery module and suitable for laser welding.SOLUTION: A bus bar 24 is used for connecting three unit cells 10 in parallel. Plate-like electrode leads 11 of the three unit cells 10 are arranged on the bus bar 24 that is bent upward into a half circle shape as viewed in a vertical cross-section, the electrode leads 11 are depressed at both sides thereof, centered on a protrusion 25 of the bus bar 24, to bring the electrode leads 11 into close contact with the bus bar 24, portions B of the electrode leads 11 in contact with the protrusion 25 of the bus bar 24 are then irradiated with a laser beam by means of a laser welder 30 to laser-weld the portions B, and thereby the three unit cells 10 are connected in parallel.SELECTED DRAWING: Figure 2 |
