Tab, battery comprising tab and packaging device for packaging battery

According to the tab, the battery comprising the tab and the packaging device for packaging the battery provided by the utility model, the appearance of the insulation paste at the edge position (namely the insulation paste in the transition area) of the metal sheet in the tab is improved, and the thickness of the insulation paste at the edge position (namely the insulation paste in the transition area) of the metal sheet is increased; when the insulating glue and the packaging film are subjected to top sealing, the position of the tab groove for top sealing is filled with enough melt glue, so that a good heat sealing effect is achieved, and potential safety hazards such as liquid leakage are avoided. 本实用新型提供了一种极耳及包括所述极耳的电池和封装所述电池的封装装置，本实用新型对极耳中的金属片的边缘位置(即过渡区域的绝缘胶)的绝缘胶的形貌进行改善，增大金属片的边缘位置(即过渡区域的绝缘胶)的绝缘胶的厚度，使绝缘胶和包装膜进行顶封时，用于顶封的极耳槽的位置填充足够多的熔胶，达到良好的热封效果，避免漏液等安全隐患的出现。