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Preparation method of battery diaphragm resisting penetration of lead dendritic crystal

A battery separator, glass microfiber technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor penetration resistance of lead dendrites, affecting battery life, battery short circuit, etc. The effect of discharge, improving cycle life, and slowing growth rate

Active Publication Date: 2011-07-20
中材科技膜材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the annual consumption of AGM separators on the market is 60,000 to 70,000 tons, and the performance indicators are homogeneous. The disadvantage is that the resistance to lead dendrite penetration is poor, which will cause internal short circuits in the battery shortly after use, affecting the service life of the battery.

Method used

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  • Preparation method of battery diaphragm resisting penetration of lead dendritic crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Mix 3kg 39°SR high-alkali glass microfiber, 15kg 44°SR high-alkali glass microfiber, 0.5kg 39°SR medium-alkali glass microfiber, 2kg 44°SR medium-alkali glass fiber, 2kg 49°SR medium-alkali glass Fiber, 10kg 54°SR medium-alkali glass microfiber, 0.5kg 59°SR medium-alkali glass microfiber, add water, and disperse with a hydraulic pulper for 6 minutes. Use the thick slurry pump to pump the obtained thick slurry into the tank with about 15m 3 In the first slurry storage tank of the 0.2‰ concentration suspending agent (polyacrylamide) solution, continue to add the above-mentioned 0.2‰ concentration suspending agent (polyacrylamide) solution until the total volume of the slurry in the slurry storage tank is 25m 3 , and continue to disperse for more than 5 minutes with a horizontal mixer to form a uniform first slurry with a concentration of 1.32‰.

[0012] 0.5kg 6μm / 6mm medium alkali glass fiber chopped strands, 0.5kg 9μm / 9mm medium alkali glass fiber chopped strands, 0.5k...

Embodiment 2

[0015] 9kg 39°SR high-alkali glass microfiber, 15kg 44°SR high-alkali glass microfiber, 0.3kg 39°SR medium-alkali glass microfiber, 1.8kg 44°SR medium-alkali glass microfiber, 1.8kg 49°SR medium-alkali Glass microfibers, 4.8kg 54 ° SR medium-alkali glass microfibers, 0.3kg 59 ° SR medium-alkali glass microfibers are dispersed with a hydraulic pulper, and the others are the same as in Example 1, and the final concentration is 1.32‰ The uniform first slurry.

[0016] 1kg 6μm / 6mm medium alkali glass fiber chopped strands, 0.5kg 9μm / 9mm medium alkali glass fiber chopped strands, 0.6kg 6mm / 2.5D PET / PET fibers, 0.4kg 6mm / 2D polypropylene fibers with a Dutch beater For dispersion, the dispersion time is 18min. Others are the same as in Example 1, finally forming a uniform second slurry with a concentration of 0.5‰.

[0017] The homogeneous slurry in the two slurry tanks is at a 10m 3 Mix in the tank at a ratio of 5:1, add water to dilute 2 times, pump to the multi-tube pulp distri...

Embodiment 3

[0019] Mix 5kg 39°SR high alkali glass fiber, 15kg 44°SR high alkali glass fiber, 0.5kg 39°SR medium alkali glass fiber, 2kg 44°SR medium alkali glass fiber, 2kg 49°SR medium alkali glass fiber Fibers, 8kg 54 ° SR medium alkali glass microfibers, 0.5kg 59 ° SR medium alkali glass microfibers were dispersed with a hydraulic pulper, and the others were the same as in Example 1, and finally a uniform slurry with a concentration of 1.32‰ was formed.

[0020] 0.5kg 6μm / 6mm medium alkali glass fiber chopped strands, 0.5kg 9μm / 9mm medium alkali glass fiber chopped strands, 0.625kg6mm / 2.5D PET / PET fibers, 0.5kg 6mm / 2D polypropylene fibers, 0.375kg 6mm / The 2D polyacrylonitrile fibers were dispersed with a Dutch beater, and the dispersion time was 18 minutes. Others are the same as in Example 1, finally forming a uniform slurry with a concentration of 0.5‰.

[0021] The homogeneous slurry in the two slurry tanks is at a 10m 3 Mix in the tank at a ratio of 5:1, add water to dilute 2 t...

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Abstract

The invention provides a preparation method of a battery diaphragm resisting the penetration of a lead dendritic crystal. Uniform felty products are formed by processing high alkali glass microfibers, medium-alkali glass microfibers, medium-alkali glass fibers chopped strands and organic fibers according to the weight ratio of 18-24:9-15:1-1.5:1-1.5 by using a wet process, wherein the high alkaliglass microfibers comprise 39-degree SR and / or 44-degree SR high alkali glass microfibers; the medium-alkali glass microfibers comprise 39-degree SR, 44-degree SR, 49-degree SR, 54-degree SR and 59-degree SR medium-alkali glass microfibers; the medium-alkali glass fiber chopped strands comprise 6 micrometers / 6 mm and 9 micrometers / 9 mm medium-alkali glass fiber chopped strands; and the organic fibers comprise 6 mm / 2.5D of polyester fibers with skin-core structure, 6 mm / 2D of polypropylene fibers, 6 mm / 3.5D of polytetrafluoroethylene fibers and 6 mm / 2D of polyacrylonitrile fibers. The preparedbattery diaphragm resisting the penetration of a lead dendritic crystal can obviously improve the dendritic crystal penetration resistance of a battery.

Description

technical field [0001] The invention relates to a preparation method of an anti-lead dendrite penetration battery diaphragm. Background technique [0002] Adsorbed glass fiber mat diaphragm (AGM diaphragm) is an important component of valve-regulated lead-acid batteries. Its main function is to isolate the positive and negative plates of lead-acid batteries and absorb the electrolyte required for charge and discharge reactions. AGM diaphragm has been used in lead-acid batteries for nearly 40 years. After a series of improvements, the performance has been improved, but basically the same, there is no fundamental breakthrough. There are mainly 2-3 kinds of raw materials, and there are quite a lot of differences. defect. At present, the annual consumption of AGM separators on the market is 60,000 to 70,000 tons, and the performance indicators are homogeneous. The disadvantage is that the anti-lead dendrite penetration ability is poor, and it will cause internal short circuit o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/44
CPCY02E60/12Y02E60/10
Inventor 王志明刘金云汪海杰沈维海陈春戴旭鹏
Owner 中材科技膜材料(山东)有限公司
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