Electrode assembly and secondary battery

A technology of electrode components and pole pieces, which is applied in the field of electrode components and secondary batteries, can solve the problems of waste of materials, shedding of active material layers, etc., and achieve the effect of reducing the overlapping area, avoiding shedding, and reducing the risk of shedding

Pending Publication Date: 2021-02-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of cutting the tabs, the cutter is easy to act on the active material layer, causing the risk of the active material layer falling off, resulting in waste of materials

Method used

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  • Electrode assembly and secondary battery
  • Electrode assembly and secondary battery
  • Electrode assembly and secondary battery

Examples

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Embodiment Construction

[0066] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0067] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; terms "Multiple" means more than two (including two); unless otherwise specified or stated, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integrated Ground connection, or electrical connection, or signal connection; "connectio...

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Abstract

The invention provides an electrode assembly and a secondary battery. The electrode assembly comprises a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm separates the first pole piece from the second pole piece. The first pole piece comprises a first current collector and a first active substance layer, the first current collector comprises a first main body part and afirst tab, and the first tab extends from one end of the first main body part along the longitudinal direction; the first main body part comprises a first coating area and a first transition area, and the first transition area is arranged between the first tab and the first coating area; and the surface of the first coating area is coated with the first active substance layer, and the first transition area and the first tab are not coated with the first active substance layer. The second pole piece comprises a second current collector and a second active substance layer, the second current collector comprises a second main body part and a second tab, the second tab extends from one end of the second main body part along the longitudinal direction, and the second active substance layer iscoated on the surface of the second main body part. The edge, away from the first coating area, of the first transition area does not exceed the edge of the second active material layer.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrode assembly and a secondary battery. Background technique [0002] The electrode assembly of the secondary battery includes a pole piece and a separator, and the pole piece includes a current collector and an active material layer coated on the surface of the current collector. In order to facilitate the electrical connection with the electrode terminals of the secondary battery, tabs are usually cut out on the current collector. Before cutting the tab, the current collector has a coated area coated with an active material layer and an uncoated area not coated with an active material layer, and the tab is formed by cutting the uncoated area. In the process of cutting the tabs, the cutter can easily act on the active material layer, causing the risk of the active material layer falling off, resulting in waste of materials. Contents of the invention [0003] In view of the pr...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/66
CPCH01M4/70H01M4/667Y02E60/10H01M50/531H01M4/661H01M10/0525H01M50/195H01M50/198H01M2004/021
Inventor 许虎任苗苗林永寿许龙来佑磊金海族朱凌波
Owner CONTEMPORARY AMPEREX TECH CO
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