Electrode plate and electrochemical device

Abstract

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the electrode active material layer is arranged onthe main body part of the current collector, the area is called as a membrane area, the electric connecting component and the current collector are welded and connected at the edge of the current collector, the welding area is called as an adapter welding area, wherein the transition area of the current collector between the membrane area and the adapter welding area, which is not coated with theelectrode active material layer, is called as an extension area, the current collector is a composite current collector, the electrode plate further comprises a heat conduction coating, and the heat conduction coating covers at least one part of the electric connection component in the adapter welding area.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to an electrode sheet and an electrochemical device. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. With the continuous expansion of the application range of lithium-ion batteries, the requirements for the gravimetric energy density and volumetric energy density of lithium-ion batteries are also getting higher and higher. [0003] In order to obtain lithium-ion batteries with high mass energy density and volume energy density, lithium-ion batteries are usually improved as follows: (1) select positive electrode materials or negative electrode materials with high discharge specific capacity; (2) optimize the mechanical design of lithium-ion batteries , to minimize its volume; (3) select a positiv...

AI Technical Summary

Problems solved by technology

[0005] For pole pieces and batteries using metal-coated plastic current collectors (composite current collectors), although the energy density is improved, it may cause some problems or performance degradation in terms of processing performance and electrochemical performance.

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