公开(公告)号：EP4451405A1

公开(公告)日：2024-10-23

申请号：EP22942128.4

申请日：2022-05-20

申请人： Contemporary Amperex Technology (Hong Kong) Limited

发明人： LI, Quanguo ,  LIU, Qian ,  YE, Yonghuang ,  YU, Chunpeng ,  SUN, Jingxuan ,  CHEN, Jiahua ,  XIAO, Dejun

IPC分类号： H01M10/054

摘要： The present application provides a sodium-ion battery, a battery module, a battery pack, and an electrical device. The sodium-ion battery includes a positive electrode plate, a negative electrode plate, and a separator; the positive electrode plate includes a positive electrode current collector and a positive electrode active material layer arranged on at least one surface of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer arranged on at least one surface of the negative electrode current collector, and the separator is arranged between the positive electrode plate and the negative electrode plate; the positive electrode active material layer has a porosity denoted as α, the negative electrode active material layer has a porosity denoted as β, and the separator has a porosity denoted as γ, which satisfy 0 ≤ (β-α)/γ