Battery cells, batteries, electrical devices, ultrasonic welding heads, and ultrasonic welding equipment

Abstract

This application relates to a battery cell (102), a battery (100), an electrical device, an ultrasonic welding head (400), and an ultrasonic welding apparatus (2000), and belongs to the technical field of batteries. The battery cell (102) comprises a case (1), an electrode assembly (7) including an electrode post (2) provided in the case (1), an active material coating section (71) provided inside the case (1), and a tab section (72) that electrically connects the active material coating section (71) and the electrode post (2), wherein the tab section (72) includes a plurality of tab sheets (721), and the plurality of tab sheets (721) are stacked and connected to form a convergence section (722), and the convergence section (7 22) has a first region (7221) and a second region (7222), and the multiple tab sheets (721) are compacted to a greater degree in the first region (7221) than in the second region (7222), and a connection portion (8) is formed at a position for electrically connecting to the pole column (2) of the convergence portion (722), and at least a part of the edge portion (81) of the connection portion (8) in the convergence portion (7222) is located in the first region (7221).

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