阅读说明：本技术 电芯及锂离子电池 (Battery cell and lithium ion battery ) 是由 曾巧 江静 王可飞 于 2018-04-11 设计创作，主要内容包括：本申请提供了一种电芯,包括卷绕形成电芯的一部分的第一极片,其中,沿展开的第一极片的长度方向,第一极片具有第一端部并且第一端部的边缘形成有第一缺口。还提供一种锂离子电池。本申请的目的在于提供一种能够辨别极片的头部和尾部的电芯及锂离子电池。(The application provides a battery cell, including the first pole piece of coiling formation battery cell partly, wherein, along the length direction of the first pole piece of expansion, first pole piece has first end and the edge of first end is formed with first breach. A lithium ion battery is also provided. An object of the application is to provide a can distinguish electric core and lithium ion battery of head and afterbody of pole piece.)