Method for joining metal plates and metal sheets, method for manufacturing busbar modules, and method for manufacturing battery modules

Abstract

To provide a method for bonding a metal plate and a metal sheet, a method for manufacturing a bus bar module, and a method for manufacturing a battery module that secure bonding force.SOLUTION: At least a part (connection piece 252) of a metal plate (bus bar 25), and at least a part of a metal sheet (circuit body 20) thinner than the metal plate are superposed, and the superposed portion of the metal plate (bus bar 25) and the metal sheet (circuit body 20) is irradiated with laser light from a side of the metal plate (bus bar 25), in order to bond the metal plate (bus bar 25) and the metal sheet (circuit body 20).SELECTED DRAWING: Figure 5

Claims

1. A portion of a metal plate and a portion of a metal sheet that is thinner than the metal plate are placed on top of each other. By irradiating the portion where the metal plate and the metal sheet are overlapped with a laser beam from the metal plate side, the metal plate and the metal sheet are joined together. An anchor portion is formed on the surface of the metal sheet opposite to the surface where the metal plates are stacked by irradiation with the laser light. Joining method.

2. The laser light is intermittently irradiated while moving the irradiation area. The joining method according to claim 1.

3. The melting point of the metal plate is lower than the melting point of the metal sheet. The joining method according to claim 1.

4. The aforementioned metal plate is an aluminum busbar, The aforementioned metal sheet is a flexible wiring board composed of copper foil. The joining method according to claim 1.

5. A method for manufacturing a busbar module comprising an aluminum busbar as the metal plate and a flexible wiring board as the metal sheet, using the joining method described in claim 1, At least a portion of the busbar and at least a portion of the flexible wiring board are superimposed. The portion where the busbar and the flexible wiring board are overlapped is illuminated with the laser light from the busbar side to join the busbar and the flexible wiring board. method.

6. A method for manufacturing a battery module comprising a battery assembly and a busbar module, The busbar module is manufactured by the method described in claim 5, The busbar module is assembled to the battery assembly. method.

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