公开(公告)号：US11316158B2

公开(公告)日：2022-04-26

申请号：US17159138

申请日：2021-01-26

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yingjie Guan ,  Yuzhen Zhao ,  Yan Wen ,  Qisen Huang ,  Xin Liu

IPC: H01M4/505 ,  H01M4/36 ,  H01M4/48 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/02

Abstract: The present application provide a secondary battery and related battery module, battery pack and apparatus. The secondary battery includes a positive electrode plate, a negative electrode plate, a separator and an electrolyte, wherein the secondary battery includes a positive active material selected from one or more of layered lithium nickel cobalt manganese oxide and layered lithium nickel cobalt aluminum oxide, and a negative active material including graphite and silicon-oxygen compound; the delithiation capacity A of the negative electrode film in the voltage range of 0.005V to the delithiation platform voltage and the delithiation capacity B of the negative electrode film in the voltage range of the delithiation platform voltage to 1.2V satisfy: 1A/B2; and when the secondary battery is discharged to a voltage of 2.5V, the voltage U of the negative electrode plate relative to a lithium metal reference electrode satisfies: 0.5VU0.7V.