Automotive battery packs for electric vehicles typically consist of a large number of battery cells. These cells must be assembled together with robust mechanical and electrical joints. This chapter provides a comprehensive review of joining technologies for automotive lithium-ion battery manufacturing. It compares the advantages and disadvantages of the different joining technologies as related to battery manufacturing, including ultrasonic welding, resistance welding, laser beam welding, wire-bonding, and mechanical joining. Joining processes for electrode-to-tab, tab-to-tab, tab-to-busbar, and module-to-module assembly are discussed with respect to cell types and pack configuration. This chapter also describes the basic concepts in ultrasonic welding, serving as...