Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (Hong Kong) Limited

Contemporary Amperex Technology Limited

Fajun Huang

Yonghuang Ye

Qian Liu

Quanguo Li

Haizu Jin

Chengdu Liang

Xiaofu Xu

Jianfu He

Songjun Shi

Chenhui Lin

Jun Peng

A secondary battery includes a positive electrode plate. that includes a positive current collector, a first positive active material layer distributed on one side of the positive current collector, and a second positive active material layer distributed on an other side of the positive current collector and a negative electrode plate that includes a negative current collector, a first negative active material layer distributed on one side of the negative current collector and opposite to the second positive active material layer, and a second negative active material layer distributed on an other side of the negative current collector. A resistance of the first positive active material layer is R1, a resistance of the second positive active material layer is R2, a resistance of the first negative active material layer is R3, a resistance of the second negative active material layer is R4.

Secondary battery, battery module, battery pack, and electrical device

A battery module, a battery pack, and an electric apparatus are provided. In some embodiments, the battery module includes a first type of cell and a second type of cell that are cells of different chemical systems, where the first type of cell includes n first cells, the second type of cell includes m second cells, n and m each are selected from an integer greater than 1, at least one of the first cells and at least one of the second cells are electrically connected in series, and the first cell and the second cell satisfy at least the following relationships: 0.08≤ΔR/ΔR≤3.50, and 0.10 mΩ/100 cycles≤ΔR≤0.40 mΩ/100 cycles, where ΔRis a discharge resistance growth rate of the first cell, and ΔRis a discharge resistance growth rate of the second cell; and IMP<IMP, where IMPis an alternating current impedance of the first cell, and IMPis an alternating current impedance of the second cell.

Battery module, battery pack, and electric apparatus

A positive electrode sheet includes a current collector including a coating region and a non-coating region, a resistance layer disposed on the current collector and including a conductive agent, a first binder, and a first positive electrode active material, and a positive electrode active material layer including a second positive electrode active material, a conductive agent, and a second binder. A resistance of the resistance layer is greater than a resistance of the positive electrode active material layer. In a cross section of the positive electrode sheet, a projection of at least a part of the positive electrode active material layer on the current collector and a projection of the resistance layer on the current collector do not overlap. A polarization parameter P of the positive electrode sheet is in a range of 0.4-65.0 and equals ((1−S)/S)·(R1/R2).

Positive electrode sheet and secondary battery including the same, battery module, battery pack, and electrical apparatus

The present application provides a battery pack and a power consuming device powered by the battery pack. The battery pack includes a battery pack cavity and a plurality of battery cells received in the battery pack cavity. An interior space of the battery pack cavity can be divided into a first region with a temperature change rate of K1 and a second region with a temperature change rate of K2, where 0.066&#x2264;K1&#x2264;0.131 and 0.034&#x2264;K2&#x2264;0.066, K1 and K2 being expressed in &#xb0; C./min. The plurality of battery cells include at least one first battery cell arranged in the first region, and at least one second battery cell arranged in the second region. The battery pack of the present application can reduce or avoid the cask effect at low temperature and improve the energy retention rate at low temperature.

Battery pack and power consuming device

Growing community of inventors

Ningde, China

Fajun Huang