Contemporary Amperex Technology Co., Ltd.

Jianfu Pan

Yonghuang Ye

Qian Liu

Quanguo Li

Xiaofu Xu

Xinyu Zhang

A battery unit may comprise a first cell type and a second cell type electrically connected at least in series, wherein the first cell type may include N first cells, the second cell type may include M second cells, and N and M are positive integers; the first cell may have a discharge cell balance rate of CB1, the second cell may have a discharge cell balance rate of CB2, with 0.5&#x2264;CB1&#x2264;CB2&#x2264;1.4, and when the battery unit is charged to 95%-100% of the state of charge, the first cell may have a corresponding open-circuit voltage change rate of not greater than 0.005 V/% SOC, and the second cell type may have a corresponding open-circuit voltage change rate greater than that of the first cell.

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Fujian, China

Jianfu Pan