Bonding Process and Application Properties of an Al-Ni Layer Composite Sheet for Lithium-ion Battery Packaging

The cold roll bonding process of an Al-Ni layer composite sheet applied as a brazing solder for the welding of nickel and aluminum structures in the lithium-ion battery packaging was investigated. The effects of roll bonding and annealing treatment on the application properties and the interface compounds of Al-Ni composite sheet were also studied. The results show that the appropriate rolling reduction to bond and produce Al-Ni layer composite sheet is between 50% and 60% deformation degree. During the annealing process, the first formed Al3Ni phase in the interface of Al and Ni is beneficial to the bonding of such two metals, but the sequently formed Al3Ni2 phase results in cracks and separation of the Al-Ni layers. The roll-bonded Al-Ni layer composite sheet acquires good bending endurance, stable weldability and suitable electrical resistivity upon annealing at 698 K to 748 K for 1 h.