Micro capsule for valve controlled sealed lead-acid accumulator and its prepn

A lead-acid battery, valve-controlled technology, applied in the direction of lead-acid batteries, battery pack parts, secondary battery parts, etc., can solve the problems of shortened battery life, capacity decline, battery internal pressure increase, etc., to achieve enhanced The effects of market competitiveness, improved service life, and increased float charge life

Inactive Publication Date: 2004-11-24
江苏隆源双登电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Valve-regulated sealed lead-acid batteries often dry up and fail due to water loss during use, which greatly shortens the service life of the battery
Analysis of the main reason is that due to the decomposition of water, the precipitated oxygen and hydrogen increase the internal pressure of the battery, start the exhaust valve to discharge the gas out of the battery case, and bring out water and sulfuric acid at the same time, causing the battery to lose water and reduce its capacity until the end of its life.
Another important reason leading to the failure of lead-acid batteries is the deformation of the plates during charging and discharging. As a result of the deformation, the size of the grid increases linearly, and even individual ribs break, which is likely to cause a mechanical short circuit and eventually the entire battery is damaged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] Next, polymethyl methacrylate is used as the capsule wall material, and microcapsules coated with sulfuric acid electrolyte are prepared by spray drying.

[0010] Polymethyl methacrylate is dissolved in dichloroethane solvent, the concentration of the solution is about 5%, and then 1.05g / cm 3 Sulfuric acid is added with stirring to form a water-in-oil emulsion, and this water-in-oil emulsion is sprayed in a spray drying tower with a hot air flow (35°C) to form a small water-in-oil emulsion Drops, the oil phase is polymethyl methacrylate dissolved in dichloroethane, and the water phase is aqueous sulfuric acid. Ethylene dichloride volatilizes away with the hot air flow and is recovered separately. Polymethyl methacrylate solidifies into a solid-phase porous shell, forming microcapsules encased in sulfuric acid electrolyte. The porosity and pore size of the microcapsules depend on the composition of the oil phase and the temperature and flow rate of the gas stream in th...

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PUM

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Abstract

The present invention features that the microcapsule is solid phase porous casing of polymer material and is filled with deionized water or sulfuric acid electrolyte liquid. The microcapsule is prepared via spray drying process. When it is filled into the gap partially or completely, the microcapsule can avoid the deformation of the plate electrode and replenish water during the use of the accumulator. The present invention can prolong the use life of lead-acid accumulator greatly, including 60% prolonged float charging life and 80% prolonged circulation life.

Description

technical field [0001] The invention relates to a microcapsule for a valve-controlled sealed lead-acid battery and a preparation method thereof, belonging to the technical field of sealed lead-acid batteries. Background technique [0002] Lead-acid battery occupies a pivotal position in the field of secondary batteries by virtue of its excellent performance-price ratio. In all aqueous solution power supply systems, lead-acid batteries have higher working voltage, better high-current discharge performance and high-low temperature discharge performance, and it is suitable for both floating charge and starting and cycle use, so Lead-acid batteries are widely used in fields such as backup power, energy storage and power supply. Although valve-regulated sealed lead-acid battery technology has become increasingly mature, there are still many problems in VRLA batteries. Valve-regulated sealed lead-acid batteries often dry up and fail due to water loss during use, which greatly sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/00H01M10/02H01M10/06
CPCY02E60/126Y02E60/10
Inventor 阎智刚祝士平陈怀林管雄俊
Owner 江苏隆源双登电源有限公司
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