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Insulating mineral oil for cooling lithium batteries and preparation method of insulating mineral oil

A mineral oil and lithium battery technology, applied in the petroleum industry, lubricating compositions, etc., can solve problems such as unsatisfactory, performance parameters that cannot meet parameter requirements, and non-satisfaction, etc.

Inactive Publication Date: 2018-11-20
南通鼎鑫电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these two binary mixed insulating oils have a certain effect of delaying the aging of insulating paper, many of their important performance parameters cannot meet the current GB2536-2011 "Unused Mineral Insulating Oil for Electrical Fluid Lithium Batteries and Switches" " Relevant parameter requirements
For example, the kinematic viscosity of insulating oil mixed with olive oil and mineral oil is 12.855mm2 / s, which can no longer meet the requirement of no more than 12mm2 / s stipulated in the national standard; its breakdown voltage is only 58kV, which can no longer meet the requirements of the national standard The dielectric loss of the mixed insulating oil mixed with rapeseed oil and mineral oil is 0.597%, which cannot meet the requirement of not more than 0.5% specified in the national standard

Method used

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Examples

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Effect test

preparation example Construction

[0038] The present invention provides a kind of preparation method of the insulating mineral oil that is applied to lithium battery cooling described in above-mentioned technical scheme, comprises the following steps:

[0039] a) Mineral oil, soybean oil and palm oil are mixed, stirred and heated for more than 20 minutes to obtain mixed oil;

[0040] b) mixing part of the mixed oil with the antioxidant, stirring, and placing at a constant temperature to obtain the mother liquor;

[0041] c) mixing the mother liquor and the remaining part of the mixed oil, stirring, and vacuum drying at low temperature to obtain insulating mineral oil applied to lithium battery cooling.

[0042] In the present invention, mineral oil, soybean oil and palm oil are mixed and stirred to obtain mixed oil. In the present invention, the stirring rate is preferably 2400-2600rpm, more preferably 2450rpm-2550rpm, most preferably 2500rpm; the stirring time is preferably 10-35min, more preferably 18-30min...

Embodiment 1

[0050] a) 76kg 25# mineral oil, 19kg soybean oil (power frequency breakdown voltage of soybean oil: 73kV; 90°C dielectric loss: 1.76%; 40°C kinematic viscosity: 29.5mm2 / s) and 5kg kinematic viscosity are 5.1mm2 / s (40°C) palm oil was mixed, put into the same container, and stirred at a rate of 2500r / min for 15 minutes using a stirrer at room temperature to obtain a mixed oil;

[0051] b) Mix 10kg of the mixed oil with 0.2kg T511 and 0.2kg L06 antioxidant, stir for 5min, and place it at a constant temperature at 60°C for 24h to obtain the mother liquor;

[0052] c) Mix the mother liquor and the remaining 90 kg of the mixed oil, stir for 30 minutes, and use a vacuum drying oven to vacuum-dry the mixed insulating oil added with composite antioxidants for 48 hours, so that the water content of the mixed insulating oil is reduced to below 20 ppm, and the obtained Insulating mineral oil for cooling lithium batteries.

Embodiment 2

[0054] a) 75kg 25# mineral oil, 16kg soybean oil (power frequency breakdown voltage of soybean oil: 73kV; 90°C dielectric loss: 1.76%; 40°C kinematic viscosity: 29.5mm2 / s) and 9kg kinematic viscosity are 5.1mm2 / s (40°C) palm oil was mixed, put into the same container, and stirred at a rate of 2500r / min for 15 minutes using a stirrer at room temperature to obtain a mixed oil;

[0055] b) Mix 10kg of the mixed oil with 0.2kg T511 and 0.2kg L06 antioxidant, stir for 5min, and place it at a constant temperature at 60°C for 24h to obtain the mother liquor;

[0056] c) Mix the mother liquor and the remaining 90 kg of the mixed oil, stir for 30 minutes, and use a vacuum drying oven to vacuum-dry the mixed insulating oil added with composite antioxidants for 48 hours, so that the water content of the mixed insulating oil is reduced to below 20 ppm, and the obtained Insulating mineral oil for cooling lithium batteries.

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Abstract

The invention provides insulating mineral oil for cooling lithium batteries and a preparation method of the insulating mineral oil. The insulating mineral oil comprises base oil and an antioxidant; the base oil comprises the following components in percentage by mass: 15-30% soybean oil, 1-7% palm oil and 65-82% mineral oil; and the antioxidant comprises glyceride and at least one of the followingcomponents: tertiary butylhydroquinone (TBHQ), butylated hydroxytoluene (BHT) and propyl gallate (PG), wherein the percentage between the mass of each component and the total mass satisfies the following relationships: the TBHQ with mass ratio below 15%, the BHT with mass ratio below 5%, the PG with mass ratio below 5% and the glyceride with mass ratio above 90%. The insulating mineral oil used for cooling the lithium batteries is lower in kinetic viscosity and dielectric loss as compared to the traditional mixed insulating oil, and therefore the insulating oil has better heat dissipation performance, and the oil-paper insulating systems of the lithium batteries have lower operating temperature under the same operating load.

Description

technical field [0001] The invention relates to the technical field of insulating oil, in particular to an insulating mineral oil used for cooling lithium batteries and a preparation method thereof. Background technique [0002] At present, insulating oil is mainly divided into mineral insulating oil, synthetic insulating oil, vegetable insulating oil and mixed insulating oil. Mineral oil has outstanding advantages such as cheap price, excellent insulation performance, low freezing point, and low viscosity. It is the most widely used insulating oil in oil-immersed heat dissipation. However, mineral oil is a non-renewable fossil energy, and its flash point, ignition point and water saturation are low, and its biodegradability is poor. Once it leaks, it will cause pollution to water sources and living environments, which does not meet the requirements of green and environmentally friendly insulating materials. . In the past 20 years, the research on finding substitutes for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10N30/02C10N30/10C10N40/16
CPCC10M169/045C10M2203/1025C10M2207/026C10M2207/283C10M2207/284C10M2207/401C10M2215/064C10M2215/065C10N2030/02C10N2030/10C10N2040/16
Inventor 陈邵毅王平恽青徐东亚张夏
Owner 南通鼎鑫电池有限公司
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