Electrode plate, electrode assembly, electrochemical device, electronic device and preparation method

An electrode pole piece and electrode assembly technology, which is applied in the fields of electronic devices and their preparation, electrochemical devices, electrode pole pieces, and electrode assemblies, can solve problems such as hidden dangers, pole piece powder dropping, and safety problems, and achieve the effect of improving powder dropping.

Active Publication Date: 2021-05-04
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the structural design of the square battery cannot be directly imported into the curved battery, otherwise it will bring a series of problems and even safety hazards, for example, powder falling off the pole piece

Method used

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  • Electrode plate, electrode assembly, electrochemical device, electronic device and preparation method
  • Electrode plate, electrode assembly, electrochemical device, electronic device and preparation method
  • Electrode plate, electrode assembly, electrochemical device, electronic device and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1) Preparation of negative pole piece:

[0064] Graphite is used as the negative electrode active material, conductive carbon black is used as the conductive agent, and styrene-butadiene rubber (SBR) is used as the binder, and the above materials are mixed according to graphite: conductive carbon black: styrene-butadiene rubber = 96: 1.5: 2.5, Deionized water was added as a solvent to prepare a negative electrode slurry with a solid content of 50%, and stirred evenly. The negative electrode slurry was uniformly coated on the first surface of the 6 μm negative electrode current collector copper foil, dried and cold pressed at 110° C. to obtain a negative electrode sheet with a thickness of 200 μm in the second region. Adopt the method of twice intermittent cold pressing to cold press along the coating direction to form 10 first areas, and the area without cold pressing is the second area, wherein the compacted density P1 of the first area is the same as that of the secon...

Embodiment 2

[0072] The difference between this example and Example 1 is that in the preparation of the negative electrode sheet, the ratio P1 / P2 of the compacted density P1 of the diaphragm in the first region to the compacted density P2 of the diaphragm in the second region is 1.5, and the corresponding The thickness ratio H1 / H2 of the first region and the second region is 0.6, the bonding force V1 / V2 of the first region and the second region is 1.8, and the rest are the same as in the first embodiment.

Embodiment 3

[0074] The difference between this example and Example 1 is that in the preparation of the negative electrode sheet, the ratio P1 / P2 of the compacted density P1 in the first region to the compacted density P2 of the diaphragm in the second region is 1.3, and the corresponding first The thickness ratio H1 / H2 of the region and the second region is 0.75, the bonding force V1 / V2 of the first region and the second region is 1.34, and the rest are the same as in the first embodiment.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses an electrode plate comprising a bending region, a preparation method of the electrode plate, and a lithium ion battery comprising the electrode plate. The electrode plate comprises a current collector and an active material layer; the current collector comprises a first surface and a second surface which are located in a bending area, the first surface is concave, and the second surface is convex; and the active material layer is arranged on the first surface of the current collector. When the bending area is in the flat state, the active material layer comprises at least one first area and at least one second area adjacent to the first area. The ratio range of the compaction density P1 of the first area to the compaction density P2 of the second area is that P1/P2 is larger than or equal to 1.05 and is less than or equal to 1.5. Through the mode, the mechanical stress in the electrode plate cannot be excessively concentrated in the bending process of the electrode plate, so that the problem of powder falling of the electrode plate caused by stress concentration can be solved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium-ion batteries, and in particular to an electrode pole piece, an electrode assembly, an electrochemical device, an electronic device and a preparation method. Background technique [0002] Lithium-ion batteries have many advantages such as large volume and mass energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. In recent years, with the rapid development of electronic technology, the requirements for energy density have been continuously improved, and the design of mobile electronic devices has become more and more diversified and miniaturized, which has increased the requirements for the shape adaptability of batteries. In order to meet the needs of diversified products in the market, such as AR&VR equipment, helmet-mounted wearable device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 彭涛杨新盛阳平胡乔舒
Owner NINGDE AMPEREX TECH
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