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A kind of production method of anti-short-circuit AGM separator

A production method and anti-short circuit technology, which is applied in the direction of circuits, final product manufacturing, electrochemical generators, etc., can solve the problem that the thickness of the separator is not well controlled, the uniformity of the aperture of the separator is affected, and the distribution of the aperture of the separator is uneven. Uniformity issues, to achieve the effect of ensuring the uniformity of the thickness of the separator, high porosity, and reducing flocculation

Active Publication Date: 2019-01-11
ZHEJIANG CHANGTONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, the glass fiber is not easy to disperse and flocculate when beating, and the uniformity of the prepared separator is poor; the slurry cannot be well stabilized due to the vacuum negative pressure during the forming and papermaking process, resulting in the thickness of the separator. If the control is very good, the uniformity of the thickness of the separator is poor; after the polyolefin resin is melted, the pore size distribution of the separator will be uneven, which will affect the consistency of the pore size of the separator. As the battery is charged and discharged, the positive lead powder will gradually There is a small amount of penetration through the separator to the negative electrode to cause a short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of modified bamboo fiber: add bamboo fiber with a length of 2 mm and a diameter of 0.03 mm to chlorosulfonic acid, heat to 80°C to swell for 1 hour, cool, filter, wash the filtrate with water until the pH is neutral, and dry in vacuum. Then add it into the sizing agent for soaking for 30 minutes, and then dry it at 95°C to obtain the modified bamboo fiber, which is ready for use. The sizing agent is made of the following components by mass percentage: 40% polytetrafluoroethylene dispersion emulsion, 0.1% quaternary Ammonium salt, 0.3% polyoxyethylene stearate, 0.1% silane coupling agent KH-550, the balance is water;

[0031](2) Preparation of modified nano-vermiculite powder: add nano-vermiculite powder to dilute sulfuric acid, heat to 85°C for 5 hours, filter, wash with deionized water until the pH is neutral, dry, and add modification solution after calcining at 800°C After medium-shear dispersion, shake at 40°C for 5 hours, filter and dry to obtain mo...

Embodiment 2

[0039] (1) Preparation of modified bamboo fiber: add bamboo fiber with a length of 4mm and a diameter of 0.05mm to chlorosulfonic acid, heat to 90°C to swell for 2 hours, cool, filter, wash the filtrate with water until the pH is neutral, and dry in vacuum. Then add it into the sizing agent for soaking for 40 minutes, and then dry it at 100°C to obtain the modified bamboo fiber, which is ready for use. The sizing agent is made of the following components by mass percentage: 45% polytetrafluoroethylene dispersion emulsion, 0.15% quaternary Ammonium salt, 0.4% polyoxyethylene stearate, 0.2% silane coupling agent KH-550, the balance is water;

[0040] (2) Preparation of modified nano-vermiculite powder: add nano-vermiculite powder to dilute sulfuric acid, heat to 88°C for 4 hours, filter, wash with deionized water until the pH is neutral, dry, and add modification solution after calcining at 850°C After medium-shear dispersion, shake at 35°C for 6 hours, filter and dry to obtain ...

Embodiment 3

[0048] (1) Preparation of modified bamboo fiber: Add bamboo fiber with a length of 4mm and a diameter of 0.05mm into chlorosulfonic acid, heat to 100°C to swell for 1 hour, cool, filter, wash the filtrate with water until the pH is neutral, and dry in vacuum. Then add it into the sizing agent for soaking for 60 minutes, and then dry it at 105°C to obtain the modified bamboo fiber. It is ready to use. The sizing agent is made of the following components by mass percentage: 50% polytetrafluoroethylene dispersion emulsion, 0.2% quaternary Ammonium salt, 0.5% polyoxyethylene stearate, 0.3% silane coupling agent KH-550, and the balance is water;

[0049] (2) Preparation of modified nano-vermiculite powder: Add nano-vermiculite powder into dilute sulfuric acid, heat to 90°C for 5 hours, filter, wash with deionized water until the pH is neutral, dry, and add modification solution after calcining at 900°C After medium-shear dispersion, shake at 40°C for 5 hours, filter and dry to obta...

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Abstract

The invention discloses a production method of an anti-short circuit AGM separator, comprising the following steps: (1) preparing modified bamboo fiber; (2) preparing modified nano vermiculite powder; (3) batching; (4) beating; (5) Paper forming; (6) primary drying; (7) rolling; (8) secondary drying. The invention has simple process steps, strong operability, good thickness uniformity of the separator, high porosity, uniform voids, excellent comprehensive performance, and can effectively prevent short circuit caused by lead powder of the positive electrode passing through the separator to the negative electrode.

Description

technical field [0001] The invention relates to the technical field of production of AGM separators, in particular to a method for producing short-circuit-proof AGM separators. Background technique [0002] Glass microfiber separator (AGM) is one of the key materials of valve-regulated lead-acid batteries. The main functions of AGM separators for valve-regulated lead-acid batteries are: (1) to prevent positive / negative plates from contacting each other and causing internal damage to the battery. short circuit; (2) make the battery tightly assembled and reduce the battery volume; (3) prevent the plate from being deformed, bent and active material from falling off; (4) store a necessary amount of electrolyte in the porous separator between the plates to To ensure high conductivity and the need for battery reaction; (5) to prevent some substances harmful to the battery from migrating and diffusing through the separator. Therefore, the AGM separator is called the third electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/12
CPCH01M10/121H01M50/403H01M50/4295H01M50/44Y02E60/10Y02P70/50
Inventor 陈连强黄建忠郑书根应志超
Owner ZHEJIANG CHANGTONG SCI & TECH
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