Tab, battery cell and battery

The embodiment of the invention provides a tab. The tab comprises a base body, and a protective layer located outside the base body. The protective layer includes a first non-metal element and a firstmetal element. The atomic ratio between the first non-metal element and the first metal element is in the range of 10% to 30%. The embodiment of the invention further provides a battery cell and a battery. The invention provides the tab, the battery cell and the battery, so as to at least improve the anti-electrolyte performance under the soaking of an electrolyte. 根据本申请的实施例，提供了一种极耳，包括：基体；保护层，位于基体的外部；其中，保护层包括第一非金属元素和第一金属元素，并且第一非金属元素和第一金属元素之间的原子比在10％至30％的范围内。本申请的实施例还提供了电芯和电池。本申请的目的在于提供极耳、电芯以及电池，以至少实现提升电解液浸泡下的抗电解液性能。