Multi-coating structure, negative pole piece and application of negative pole piece

A negative pole piece and coating technology, which is applied in the field of negative pole piece, negative pole piece, and multi-coating structure, can solve the problem of powder drop of the pole piece, and achieve the effect of normal pressure drop and improvement of yield rate.

Active Publication Date: 2021-07-13
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a multi-width coating structure, negative pole piece and the use of the negative pole piece. By setting the side coating slurry layer in the side coating area, the problem of negative electrode to positive electrode tab can be solved. It can effectively reduce the short-circuit rate of the battery cell and improve the yield rate of the battery, and has the characteristics of simple structure, easy implementation and easy industrialization, etc.

Method used

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  • Multi-coating structure, negative pole piece and application of negative pole piece
  • Multi-coating structure, negative pole piece and application of negative pole piece
  • Multi-coating structure, negative pole piece and application of negative pole piece

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Embodiment 1

[0072] This embodiment provides a plurality of coating structures based on a plurality of coating structures provided in a specific embodiment, wherein there is a pole region on the current collector, and the width of the side coating zone 3 is 4mm, and the slurry is slurry. The dry weight mass of the layer is 2.5%, and the dry weight mass of the dispersant is 2.0%, and the weight mass of the conductive agent is 2.0%, and the weight mass of the negative electrode active material is 93.5. %. The solid content of the slurry slurry was 45%, the viscosity was 2250 MPa · s. The binder mass in the slurry layer is greater than 1.3% of the binder mass in the active slurry layer, and the mass mass of the conductive agent in the slurry layer is greater than that of the active slurry layer is 1.0. %.

[0073] Among them, the negative electrode active material is an intermediate phase carbon microsphere graphite; the adhesive is styrene butadiene; the dispersant is sodium carboxymethylcellulo...

Embodiment 2

[0076] This embodiment provides a plurality of coating structures, based on a plurality of coating structures provided in a specific embodiment, wherein there are two die regions on the current collector, and the width of the edge coating zone 3 is 2mm, and the slurry is slurry. The dry weight mass of the binder in the material is 2%, and the weight mass of the dispersant is 2.5%, and the weight mass of the conductive agent is 1.5%, and the weight quality of the negative electrode active material is proportional. 94%. The solid content of the slurry material is 50%, the viscosity is 1800 mPa · s. The binder mass in the slurry layer is greater than 0.8% comparison of the binder mass in the active slurry layer, and the mass mass of the conductive agent in the slurry layer is greater than that in the active slurry layer is 0.5 %.

[0077] Among them, the negative electrode active material is a single particulate human graphite; the adhesive is a styrene acrylate; the dispersant is ca...

Embodiment 3

[0080] This embodiment provides a plurality of coating structures based on a plurality of coating structures provided in a specific embodiment, wherein there are three pole regions on the current collector, and the width of the side coating zone 3 is 3 mm, and the slurry is slurry. The dry weight mass of the layer in the layer is 3%, and the weight mass of the dispersant is 0.5%, and the weight mass of the conductive agent is 2.5%, and the dry weight mass of the negative electrode active material is 94. %. The solid content of the slurry slurry was 43%, the viscosity was 2000 MPa · s. The binder mass in the slurry layer is greater than 1.8% of the binder mass in the active slurry layer, and the mass mass in the slurry layer is larger than the conductive agent mass than the active slurry layer. %.

[0081] Among them, the negative electrode active material is hard carbon graphite; the adhesive is a polyacrylic acid-acrylamide copolymer; the dispersant is sodium carboxyethylcellulos...

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Abstract

The invention provides a multi-coating structure, a negative pole piece and application of the negative pole piece. The multi-coating structure comprises a current collector, the current collector is divided into at least one pole piece area along the width direction, and two active areas are arranged in the pole piece area at intervals along the width direction of the current collector. The surface of each active area is provided with an active slurry layer, an area between the active area and the long edge of the pole piece area is a tab empty foil area, an edge coating area is arranged between the active areas. The surface of the edge coating area is provided with an edge coating slurry layer, and the adhesive force of the edge coating slurry layer is greater than that of the active slurry layer. According to the invention, the problem of powder falling during tab cutting and welding can be effectively avoided, the voltage drop of a battery cell is normal, the yield of the battery cell is increased, the capacity of the battery cell is increased, the cycle life of the battery cell is prolonged, and the storage performance of the battery cell is improved.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion batteries involving a plurality of coating preparation plates, and more particularly to a plurality of coating structures, negative electrode plates, and negative electrode plates. Background technique [0002] The magnification-type lithium ion power cell mainly includes a 48V start-stop power supply lithium-ion battery, which requires high power performance requirements in the low temperature, and needs to operate at a very low temperature. Among them, the electrode is an important part of the battery, and the high-magnification performance of the battery is determined. High-magnification performance means that lithium ions can quickly shuttle between the positive and negative poles of the battery, and the negative design of the lithium battery has a critical effect. [0003] The lithium battery negative electrode includes an electrode material such as an anode active substance, a conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/133H01M4/139H01M4/1393H01M4/04H01M10/0525
CPCH01M4/13H01M4/133H01M4/139H01M4/1393H01M4/0404H01M10/0525Y02E60/10
Inventor 朱忠泗熊后高李倩伟谭明胜韩岁伍刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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