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Coating method of lithium ion battery pole piece

A lithium-ion battery and coating method technology, which is applied to battery electrodes, devices for coating liquid on the surface, coatings, etc., can solve problems affecting the quality of the pole piece, the appearance of the pole piece, and the performance of the battery, etc., and achieve improvement Abnormal appearance, ensuring uniformity and cohesion, and improving the quality and yield of pole pieces

Active Publication Date: 2018-03-13
HEBEI YINLONG NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unreasonable oven temperature and air flow rate during the pole piece drying process will seriously affect the quality of the pole piece. If the drying is not complete, or the dried pole piece has cracks, it will not only affect the appearance of the pole piece, but also directly affect the performance of the battery.

Method used

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  • Coating method of lithium ion battery pole piece
  • Coating method of lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The coating method of the lithium-ion battery pole piece in the present embodiment comprises the following steps:

[0026] S1. Apply the positive electrode slurry to the front side of the coated foil, and then transport it to the first oven for drying at a speed of 10m / min. The temperature and circulating air volume of each section of the first oven are as follows: first section: first The first oven temperature T1 is 85°C, the circulating air volume R1 is 20Hz; the second stage: the oven temperature T2 is 110°C, the circulating air volume R2 is 25Hz; the third section: the oven temperature T3 is 120°C, and the circulating air volume R3 is 30Hz; the fourth Section: Oven temperature T4 is 120°C, circulation air volume R4 is 30Hz; fifth section: Oven temperature T5 is 100°C, circulation air volume R5 is 20Hz;

[0027] S2. Apply the positive electrode slurry to the opposite side of the single-sided coated pole piece obtained in step S1, and then transport it to the first o...

Embodiment 2

[0031] The coating method of the lithium-ion battery pole piece in the present embodiment comprises the following steps:

[0032] S1. Apply the positive electrode slurry to the front side of the coated foil, and then transport it to the first oven for drying at a speed of 20m / min. The temperature and circulating air volume of each section of the first oven are as follows: the first section: the first The first oven temperature T1 is 110°C, the circulating air volume R1 is 30Hz; the second stage: the oven temperature T2 is 130°C, the circulating air volume R2 is 35Hz; the third section: the oven temperature T3 is 140°C, and the circulating air volume R3 is 40Hz; the fourth Section: Oven temperature T4 is 120°C, circulation air volume R4 is 30Hz; fifth section: Oven temperature T5 is 120°C, circulation air volume R5 is 35Hz;

[0033] S2. Apply the positive electrode slurry to the opposite side of the single-sided coated pole piece obtained in step S1, and then transport it to th...

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Abstract

The invention discloses a method for coating a lithium ion battery pole piece. The method includes the following steps that S1, the front surface of foil with a coating is coated with slurry, and then is conveyed to a first drying oven to be dried; the first drying oven is divided into a first section, a second section, a third section, a fourth section and a fifth section which are sequentially arrayed in the conveying direction of a coating machine; S2, the back surface of the single-surface coated pole piece obtained in the first step is coated with slurry and then is conveyed to the first drying oven to be dried; S3, the double-surface coated pole piece obtained in the second step is placed in a second drying oven to be dried. By means of the method for coating the lithium ion battery pole piece, solvent in the battery pole piece can be evenly volatilized, the abnormal appearance problem of the pole piece is solved obviously, the homogeneity and cohesiveness of the pole piece are guaranteed, the quality of the pole piece is improved and the yield of the pole piece is increased.

Description

technical field [0001] The invention relates to the field of lithium-ion battery manufacturing, in particular to a coating method for lithium-ion battery pole pieces. Background technique [0002] The world's energy and environmental protection situation is becoming increasingly tense, and batteries are increasingly favored by people as a power source. Lithium-ion batteries (referred to as lithium-ion batteries) have become the first choice for the development of power batteries due to their high energy density, light volume, small weight, environmental protection and pollution-free. [0003] Coating is one of the most important processes of lithium-ion batteries. Coating is to evenly coat the positive electrode slurry or negative electrode slurry required for lithium-ion battery manufacturing on the substrate, and then dry it. At present, most of the research is to improve the coating equipment, but there is less research on the coating process, especially the control of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139B05D3/02
CPCB05D3/02H01M4/139Y02E60/10
Inventor 刘金良高峰石琳琳
Owner HEBEI YINLONG NEW ENERGY
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