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Ion-exchange membrane for liquid flow energy-storing batteries, and liquid flow energy-storing battery pack

A liquid flow energy storage battery and ion exchange membrane technology, which is applied to battery pack parts, fuel cell grouping, secondary batteries, etc., can solve the problems of battery pack charge and discharge capacity attenuation, increase equipment investment, and reduce battery pack efficiency , to achieve the effect of maintaining charge and discharge capacity, increasing the number of charge and discharge cycles, and preventing mutual migration

Active Publication Date: 2009-12-30
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Most of the above-mentioned patent documents improve the ion migration and water migration of the electrolyte solution by adding subsystems, introducing auxiliary equipment, or changing the flow mode of the electrolyte solution, but at the same time it will bring problems such as increasing equipment investment and reducing the efficiency of the battery pack; Although the method of alternately installing anion exchange membranes and cation exchange membranes in the battery pack can reduce the net migration of water and vanadium ions, the net migration of vanadium ions through cation exchange membranes is different from the net migration of vanadium ions through anion exchange membranes. Therefore, the capacity imbalance of the solution on both sides of the battery will still occur after long-term operation, which will eventually lead to the attenuation of the charge and discharge capacity of the battery pack

Method used

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  • Ion-exchange membrane for liquid flow energy-storing batteries, and liquid flow energy-storing battery pack
  • Ion-exchange membrane for liquid flow energy-storing batteries, and liquid flow energy-storing battery pack
  • Ion-exchange membrane for liquid flow energy-storing batteries, and liquid flow energy-storing battery pack

Examples

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Effect test

Embodiment 1

[0038] according to Figure 4 A battery pack with a rated power of 1.1 kilowatts is assembled from the single cells of the structure shown. The battery pack is composed of 15 single cells in electrical series, in which the ion exchange membrane has figure 1 The ion-exchange membrane with split structure shown has an effective area ratio of 6:1, and the ion-exchange membrane is integrated with the base frame and the fixed frame by thermal bonding. The charging and discharging method of the battery pack adopts constant current mode, the input and output current is 52 amperes, the output voltage range of the battery pack is 0-25 volts, the electrolyte uses 1.5 mol / liter of vanadium ion solution, and the supporting electrolyte is 3 mol / liter of sulfuric acid solution, the positive and negative electrolyte volumes are 20 liters.

[0039] The energy efficiency of the battery pack is 83%, and the efficiency of the entire battery system is 71%. The initial charging capacity of the ba...

Embodiment 2

[0041] Using the same battery pack as in Example 1, the difference is that the ion-exchange membrane, the base frame and the fixed frame are combined by solvent bonding, the energy efficiency of the battery pack is 82.5%, and the efficiency of the entire battery system is 71%. After the battery pack runs 500 charge-discharge cycles, its charging capacity decays from 48 amp hours to 45.6 amp hours, and the decay rate is less than 5%. 19.6 liters, the total concentration of vanadium ions in the positive and negative electrolytes changed from the original 1.4997 mol / L and 1.4964 mol / L to 1.4885 mol / L and 1.5026 mol / L, and the energy efficiency of the battery pack was 80%. The battery system efficiency is 70%.

Embodiment 3

[0043] Adopt the battery pack identical with embodiment 1, difference is, the ion-exchange membrane of each single cell in the battery pack adopts such as figure 2 The structural method shown is that by hot-pressing the joints of the two membranes that constitute the ion-exchange membrane, the joint parts are thermally fused together to form a whole ion-exchange membrane. The energy efficiency of the battery pack is 82%. The entire battery system The efficiency is 72%. After 500 charge-discharge cycles, the charging capacity of the battery pack has decayed from 47.8Ah to 46Ah, and the decay rate is less than 5%. The volume of the positive and negative electrolytes has changed from the original 20 liters to the positive electrode 20.2 liters, negative electrode 19.8 liters, the total concentration of vanadium ions in the positive and negative electrolytes changed from the original 1.5013 mol / L and 1.4989 mol / L to 1.4894 mol / L and 1.5103 mol / L, at this time the energy efficiency...

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Abstract

The invention relates to liquid flow energy-storing batteries, in particular to an ion-exchange membrane for liquid flow energy-storing batteries, and a liquid flow energy-storing battery pack. The ion-exchange membrane consists of two parts, wherein one part is a cation-exchange membrane, and the other part is an anion-exchange membrane, and two parts are connected or compounded into an integral ion-exchange membrane by the method of hot-pressing, blade coating, impregnating-drying and the like. The mutual migration of electroactive ions in positive and negative electrolyte solutions can be balanced or prevented by adopting the ion-exchange membrane so as to keep the basic balance of the electroactive ions on two sides of a battery. By adopting the liquid flow energy-storing battery pack, the charge-discharge capacity can be basically kept to have no attenuation, and the number of charge-discharge cycles is increased with no auxiliary equipment.

Description

technical field [0001] The invention relates to a liquid flow energy storage battery, in particular to an ion exchange membrane for a liquid flow energy storage battery and a liquid flow energy storage battery pack. Background technique [0002] As a kind of secondary battery, the liquid flow energy storage battery performs the charging and discharging process through the oxidation and reduction reactions of the electrolyte solution in the two half-cells respectively, so as to realize the conversion of energy. The flow energy storage battery has electric energy storage and high efficiency. Transformation function, long service life, environmental protection, safety and other characteristics, easy to match with solar energy, wind energy and other renewable energy power generation systems, providing technical guarantee for the utilization of renewable energy. [0003] The all-vanadium flow energy storage battery is a kind of flow energy storage battery. It realizes the storage...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/14H01M8/18H01M8/24H01M10/36H01M12/00H01M8/026H01M50/40
CPCY02E60/528Y02E60/128Y02E60/50Y02E60/10
Inventor 张华民尤东江罗庆涛邱艳玲
Owner DALIAN RONGKE POWER
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