A temperature-resistant diaphragm for solar lithium battery and solar lithium battery

A lithium battery and solar energy technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of aggravated heat accumulation, high risk, easy to melt, etc., to achieve good charging and discharging efficiency, good resistance Corrosive, low thermal shrinkage effect

Active Publication Date: 2021-05-04
广东永邦新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the shrinkage rate is too high, the polyolefin film is likely to melt under high temperature conditions, resulting in a large-area short circuit and thermal runaway, aggravating heat accumulation, generating high pressure inside the battery, causing the battery to burn or explode, especially for solar cells. In the state of heat absorption and charging, the degree of danger is higher

Method used

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  • A temperature-resistant diaphragm for solar lithium battery and solar lithium battery
  • A temperature-resistant diaphragm for solar lithium battery and solar lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A temperature-resistant separator for solar lithium batteries comprises a polyolefin film and a cellulose film compounded on the polyolefin film, and the cellulose film is made of microcrystalline cellulose and porous silicon dioxide.

[0027] Wherein, the preparation method of described cellulose film comprises the steps:

[0028] A, adding 3 parts by weight of nanocellulose to 25 parts by weight of an aqueous ethanol solution with a volume concentration of 95% for ultrasonic dispersion to obtain a dispersion;

[0029] B. Add 33 parts by weight of ethyl orthosilicate to the dispersion, adjust the pH to 9.5 with ammonia water to hydrolyze the ethyl orthosilicate to obtain nanocellulose / silicon dioxide nanospheres;

[0030] C. Calcining the nanocellulose / silica nanospheres to remove the nanocellulose to obtain porous silica nanospheres;

[0031] D. At a temperature of 80°C, dissolve microcrystalline cellulose in 1-methyl 3-butylimidazolium chloride ionic liquid in a mas...

Embodiment 2

[0041] A temperature-resistant separator for solar lithium batteries comprises a polyolefin film and a cellulose film compounded on the polyolefin film, and the cellulose film is made of microcrystalline cellulose and porous silicon dioxide.

[0042] Wherein, the preparation method of described cellulose film comprises the steps:

[0043]A, adding 1 weight part of nanocellulose to 20 weight parts of ethanol aqueous solution with a volume concentration of 92% for ultrasonic dispersion to obtain a dispersion;

[0044] B. Add 28 parts by weight of ethyl orthosilicate to the dispersion, use ammonia water to adjust the pH to 9 to hydrolyze the ethyl orthosilicate to obtain nanocellulose / silicon dioxide nanospheres;

[0045] C. Calcining the nanocellulose / silica nanospheres to remove the nanocellulose to obtain porous silica nanospheres;

[0046] D. At a temperature of 70°C, dissolve microcrystalline cellulose in 1-methyl 3-butylimidazolium chloride ionic liquid in a mass ratio of ...

Embodiment 3

[0056] A temperature-resistant separator for solar lithium batteries comprises a polyolefin film and a cellulose film compounded on the polyolefin film, and the cellulose film is made of microcrystalline cellulose and porous silicon dioxide.

[0057] Wherein, the preparation method of described cellulose film comprises the steps:

[0058] A, adding 5 parts by weight of nanocellulose to 30 parts by weight of an aqueous ethanol solution with a volume concentration of 98% for ultrasonic dispersion to obtain a dispersion;

[0059] B. Add 38 parts by weight of ethyl orthosilicate to the dispersion, use ammonia to adjust the pH to 10 to hydrolyze the ethyl orthosilicate to obtain nanocellulose / silicon dioxide nanospheres;

[0060] C. Calcining the nanocellulose / silica nanospheres to remove the nanocellulose to obtain porous silica nanospheres;

[0061] D. At a temperature of 90°C, dissolve microcrystalline cellulose in 1-methyl 3-butylimidazolium chloride ionic liquid in a mass rat...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a heat-resistant diaphragm for solar lithium batteries and a solar lithium battery. The heat-resistant diaphragm includes a polyolefin film and a cellulose film compounded on the polyolefin film. The fiber The plain film is made of microcrystalline cellulose and porous silica. In the present invention, microcrystalline cellulose and porous silica both have good heat insulation properties, can effectively protect the polyolefin film, reduce the temperature rise rate of the polyolefin film, give the charging cell sufficient reaction time, and avoid rapid temperature rise at the same time This causes the polyolefin film to fuse, resulting in a large-area short circuit. Therefore, the solar lithium battery prepared by the present invention can make up for the hysteresis in charging management, and help the charging chip to convert the charging current with temperature changes, meeting the needs of independent rechargeable lithium-ion batteries with solar energy.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a temperature-resistant diaphragm for solar lithium batteries and the solar lithium battery. Background technique [0002] Lithium-ion battery represents the development direction of energy storage equipment. It has the advantages of light weight, small size, no memory effect, and wide temperature range. The discharge requirements are relatively high. Lithium batteries that are charged by solar energy are prone to overcurrent charging, resulting in severe heating, which will cause the diaphragm to fuse and short-circuit the battery, which may cause an open flame or explosion. Therefore, it is necessary to improve the heat resistance of the diaphragm to be suitable for solar lithium batteries. [0003] The polyolefin microporous membrane has low cost, controllable pore size, stable chemical stability, good mechanical strength and electrochemical stability, and has high ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M50/431H01M50/44H01M50/451H01M50/417H01M50/403H01M10/052H01M50/489H01M50/491H01M50/494
CPCH01M10/052H01M50/4295H01M50/44H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor姚学永熊凡
Owner广东永邦新能源股份有限公司