Electrode assembly, manufacture method thereof and lithium secondary battery

Abstract

The invention discloses an electrode assembly which comprises a first polar plate, and two second polar plates, wherein active material layers are coated on two surfaces of the first polar plate, the first polar plate is continuously bent into a Z shape of a vertical cross-section along the length direction of the first polar plate, an active material layer is coated on one surface of the second polar plate, each second polar plate is continuously bent into a Z shape of a vertical cross-section along the length direction of the second polar plate, two surfaces of the first polar plate, coated with the active material layers, are respectively opposite to surfaces of the two second polar plates, coated with the active material layers, an isolating layer is arranged between the surfaces of the first polar plate, which are opposite to the second polar plates, and the first polar plate and the second polar plates are respectively provided with a contact region with connected leads. The electrode assembly is low in requirement of production equipment, is easy to process and manufacture, and is relatively prolonged in service life. The material utilization rate of the electrode assembly can be increased, the cost is lowered, and the energy density of a battery is improved, so that the volume of the electrode assembly is relatively reduced under the same capacity.

Description

technical field [0001] The invention relates to a storage battery, in particular to an electrode assembly, a manufacturing method thereof and a lithium secondary battery. Background technique [0002] As mobile devices are increasingly developed and demands on the mobile devices are increasing, the demand for batteries as an energy source for the mobile devices is also increasing dramatically. Among them, lithium secondary batteries have been commercialized and widely used due to their high energy density and voltage, extended cycle life, and low self-discharge rate. [0003] The electrode assembly is an important part of the lithium secondary battery. It usually has a structure of multiple sets of cathode plates / separators / anode plates. Currently, there are mainly wound electrode assemblies and stacked electrode assemblies. [0004] A wound-type electrode assembly is manufactured by coating a metal foil serving as a current collector with an electrode active material layer...

AI Technical Summary

Problems solved by technology

It can be seen that in the electrode assembly manufactured according to this structure, both the anode current collector and the cathode current collector can only be coated with an active material layer on one side, the utilization rate of the material is low, the cost of manufacture and use is high, and it is different from the wound type and other Compared with the stacked electrode assembly, the volume of the battery is larger under the same capacity

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