Contemporary Amperex Technology (Hong Kong) Limited

Contemporary Amperex Technology Co., Ltd.

Yuwen Wang

Baozhen Wu

Xingyan You

Kai Wu

Yonghuang Ye

Yiyang Wu

Wenlong Bai

Wei Zheng

Wanqiu Meng

Chan Liao

The present application provides a composite negative electrode active material and a preparation method therefor, a negative electrode plate comprising same, a secondary battery and a power consuming device. The composite negative electrode active material comprises a negative electrode active material substrate and a conductive polymer layer on the surface of the negative electrode active material substrate, wherein the cyclic voltammetry curve of the composite negative electrode active material has an oxidation peak within a range of 3.2 V-3.6 V and a reduction peak within a range of 2.1 V-2.6 V. The composite negative electrode active material provided by the present application can combine a low volume expansion, a high capacity per gram and a high initial coulombic efficiency, thus enabling a secondary battery to combine a low volume expansion, a high energy density and a long cycle life.

Composite negative electrode active material and preparation method therefor, negative electrode plate comprising same, secondary battery, and power consuming device

A negative electrode plate and an electrode assembly, a battery cell, a battery, and an electric apparatus containing the same are provided. The negative electrode plate () includes: a negative electrode current collector, having a first surface (a) and a second surface (b) opposite each other in a thickness direction of the negative electrode current collector; a first negative electrode film layer located on the first surface side, the first negative electrode film layer including first silicon-based negative electrode active material particles; and a second negative electrode film layer located on the second surface side, the second negative electrode film layer including second silicon-based negative electrode active material particles; where a capacity Cper unit area of the first negative electrode film layer and a capacity Cper unit area of the second negative electrode film layer satisfy: 0.005 mAh/mm≤C<C≤0.2 mAh/mm.

Assembly, battery cell, battery, and electric apparatus containing same

The present application discloses a secondary battery, a process for preparing the same, and an apparatus including the secondary battery. The secondary battery includes a negative electrode plate, and the negative electrode plate includes a negative electrode current collector and a negative electrode film; the negative electrode film includes a first negative electrode coating layer and a second negative electrode coating layer; the first negative electrode coating layer is disposed on at least one surface of the negative electrode current collector and includes a first negative electrode active material, the first negative electrode active material includes graphite; the second negative electrode coating layer is disposed on a surface of the first negative electrode coating layer and includes a second negative electrode active material, and the second negative electrode active material includes artificial graphite and a silicon-based material.

Secondary battery, process for preparing same, and apparatus comprising secondary battery

A battery cell, a battery, an electric apparatus, and a manufacturing method and manufacturing device of battery cell are described. The battery cell includes: an electrode assembly; a casing having an accommodating cavity for accommodating the electrode assembly; an exhaust mechanism provided on the casing, the exhaust mechanism including a connecting component and a breathable component, and the breathable component is configured to discharge gas to outside of the casing when gas pressure inside the casing reaches a threshold; and an electrolyte, filled in the casing; where gas permeability A of the breathable component, conductivity S of the electrolyte, and gas containment space V satisfy 20 mm*ms/cm*ml<AS/V<165 mm*ms/cm*ml, and the gas containment space V is a ratio of a remaining value of volume of the accommodating cavity minus volume of the electrolyte and volume of the electrode assembly to capacity of the electrode assembly.

Battery cell, battery, electric apparatus, and manufacturing method and device of battery cell

Growing community of inventors

Ningde, China

Yuwen Wang