An electrode pole piece and an electrochemical device

Abstract

The present application relates to the field of batteries, in particular, to an electrode sheet and an electrochemical device. The electrode sheet of the present application includes a current collector, an electrode active material layer disposed on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector, and the electrode active material layer is disposed on the current collector The main part of the main body, this area is called the diaphragm area, and the electrical connection member is welded to the current collector at the edge of the current collector. This welding area is called the transfer welding area, and the diaphragm area and the transfer The transition area between the current collector and the uncoated electrode active material layer is called the extension area. The current collector is a composite current collector, and the electrode pole piece also includes an internal short circuit protection layer. The short circuit protection layer is an organic insulating layer and covers the electrical connection member at the transfer welding area and at least a part of the extension 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...

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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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