Negative plate and lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problem of the risk of large lithium analysis in the negative electrode

Pending Publication Date: 2021-07-27
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the embodiments of the present invention is to provide a negative electrode sheet and a lithium-ion battery, aiming to solve the technical problem that the negative electrode sheet has a greater risk of lithium analysis due to the interface bonding problem in the contact area between the negative electrode sheet and the separator.

Method used

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  • Negative plate and lithium ion battery
  • Negative plate and lithium ion battery
  • Negative plate and lithium ion battery

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Embodiment Construction

[0027] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positi...

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Abstract

The invention provides a negative plate and a lithium ion battery. The negative plate comprises a current collector, a first coating, a second coating and a third coating. One side of the current collector is provided with a tab, at least one surface of the current collector is provided with a first coating area and a second coating area, and the first coating area is arranged close to the tab; the first coating covers the first coating area, the second coating covers the second coating area, and the thickness of the first coating is larger than that of the second coating; and third coatings are arranged on one surface, far away from the current collector, of the first coating and one surface, far away from the current collector, of the second coating. According to the embodiment of the invention, the thickness fluctuation of the bottom coating is eliminated by increasing the thickness of the bottom coating located in the edge area of the surface of the current collector, so that the thickness of the bottom coating is stable, the lithium precipitation risk of the negative plate caused by the interface difference existing in the contact area of the negative plate and the diaphragm is reduced, and the safety of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a negative electrode sheet and a lithium ion battery. Background technique [0002] When coating the surface of the current collector of the negative electrode sheet, since the coating is a fluid solid-liquid mixture, the coating coated on the surface of the current collector will flow along the edge perpendicular to the processing direction. The area of ​​the tab, which results in a coating thickness in the edge area that is less than that in the middle area of ​​the current collector. After the cell is wound, there is a thickness difference in the contact area between the negative electrode sheet and the separator, which leads to interface bonding problems in the contact area between the negative electrode sheet and the separator, which makes the negative electrode sheet have a greater risk of lithium precipitation. Contents of the invention [0003] The main purpose of th...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525H01M10/42
CPCH01M4/13H01M10/0525H01M10/4235H01M2004/021H01M2004/027Y02E60/10
Inventor 许岩彭冲石越李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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