Temperature-resisting 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., and achieve good charge-discharge efficiency and dispersion. Good, low thermal shrinkage effect

Active Publication Date: 2018-09-07
广东永邦新能源股份有限公司
View PDF10 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Temperature-resisting diaphragm for solar lithium battery and solar lithium battery
  • Temperature-resisting 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Pore volumeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium batteries, in particular to a temperature-resisting diaphragm for a solar lithium battery and the solar lithium battery. The temperature-resisting diaphragm comprises a polyolefine film and a cellulose membrane compounded on the polyolefine film; the cellulose membrane is prepared from microcrystalline cellulose and porous silicon dioxide. Inthe temperature-resisting diaphragm disclosed by the invention, the microcrystalline cellulose and the porous silicon dioxide have good heat insulation property, and can effectively protect the polyolefine film, reduce temperature rise rate of the polyolefine film and allow sufficient response time for a charging battery cell; meanwhile, large-area short circuit caused by fusing of the polyolefine film due to rapid temperature rise is avoided. Therefore, the solar lithium battery prepared by using the temperature-resisting diaphragm can make up hysteresis of charging management, benefits conversion of charging current of a charging chip along with temperature change and meets the demands of a solar separate lithium-ion rechargeable battery.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/417H01M50/431H01M50/44H01M50/489H01M50/491H01M50/494
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