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Drying method of battery pole piece

A drying method and technology of battery pole pieces, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of cost increase, impact on enterprises, and high failure rate of NMP gas detectors, and achieve the effect of reducing recycling energy consumption and improving efficiency

Active Publication Date: 2016-09-07
UNITED AUTO BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of NMP gas detectors results in increased costs
At the same time, the failure rate of online NMP gas detectors is extremely high, and measurement deviations are prone to occur, which affects the company's identification accuracy of risks
Therefore, there are still potential safety risks in the production of lithium-ion batteries

Method used

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  • Drying method of battery pole piece

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The cathode active material is used to prepare the cathode slurry, and its formula is shown in Table 1. The coating method is continuous coating by extrusion coating equipment. The parameters and conditions of coating and drying are shown in Table 2, wherein the gas concentration of LEL is 1.3%. The drying method is double-sided hot air drying; the NMP gas concentration is detected by the NMP gas detection alarm during the coating process, and the NMP recovery efficiency is calculated. The effect data are shown in Table 4.

[0050] Table 1: Formulation of Positive Electrode Piece

[0051]

[0052] Table 2: Parameters for coating and drying

[0053] Numbering

Embodiment 2

[0062] The positive electrode slurry was formulated with the positive electrode active material, and its formula was shown in 1-1 in Example 1, and the coating method was intermittent coating by extrusion coating equipment. The parameters and conditions of coating and drying are shown in Table 5, and the drying method is infrared drying. During the coating process, the NMP gas concentration was detected by the NMP gas detection alarm, and the effect data are shown in Table 6.

[0063] Table 5: Parameters for coating and drying

[0064] Numbering

drying temperature

gas concentration

Solid content

Coating surface density

Coating width

Transport speed

2-1

60℃

30% LEL

70％

30mg / cm 2

60cm

2m / min

2-2

70℃

55%LEL

58％

20mg / cm 2

40cm

4m / min

2-3

75℃

75%LEL

50％

25mg / cm 2

50cm

6m / min

2-4

80℃

98%LEL

60％

26mg / cm 2

70cm

8m / min

2-5

80...

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Abstract

The application relates to the field of lithium ion batteries, in particular relates to a drying method of a battery pole piece. The drying method comprises the following steps: coating slurry with N-methyl pyrrolidone as solvent on the pole piece, drying at the temperature of 50-81 DEG C. Based on the saturated vapor pressure theory and the explosion limit theory, the low-temperature drying process is realized through the regulation of the slurry and the coating process parameters, so that the production is in a 100% safe state, and the efficiency of the NMP recycling system is improved, and the NMP recycling energy consumption is greatly lowered.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular, to a method for drying battery pole pieces. Background technique [0002] Safety is the top priority of production enterprises. In order to control the risk of explosion in the coating and drying process and ensure safe production, the state and production enterprises have taken many measures. [0003] In the battery production process, the NMP gas concentration is an important reference quantity to ensure safe production or increase production. In order to detect the NMP gas concentration in the oven in real time, some companies will install online NMP gas detection and alarm devices. The online NMP gas detector is a detection device based on the principle of catalytic combustion. Through the catalysis of the catalyst, the NMP gas burns flamelessly on the surface of the catalyst, releasing heat, which leads to an increase in the resistance of the gas sensor, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139B05D3/04B05D3/02
CPCB05D3/0263B05D3/0413H01M4/139Y02E60/10
Inventor 赵丰刚邹玉刚郭超彭宁刘会会
Owner UNITED AUTO BATTERY CO LTD
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