All vanadium redox flow battery structure

Abstract

The invention discloses an all vanadium redox flow battery structure, comprising at least two single batteries; the single battery comprises two liquid flow frames; an ion exchange membrane is arranged between the two liquid flow frames; liquid flow passages are respectively arranged on the two liquid flow frames; the liquid flow frames clamp the ion exchange membrane to respectively form a first hermetic liquid storage chamber and a second hermetic liquid storage chamber; carbon-based electrode materials are respectively arranged in the first liquid storage chamber and the second liquid storage chamber; a first liquid storage pot and a second liquid storage pot are respectively communicated with the liquid flow frames; the first liquid storage chamber is communicated with the first liquid storage pot via one liquid flow passage; the second liquid storage chamber is communicated with the second liquid storage pot via the other liquid flow passage; the single batteries are connected in series via a bipolar electrode. In the structure, derious liquid flow passages are arranged on the liquid flow frames, perfluorinated ion exchange membrane serves as the ion exchange membrane and flow passages or flow chutes are arranged on the external surfaces of the carbon-based electrode materials, thereby improving electric energy transfer efficiency and uniformity of single battery property.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries, in particular to a battery structure of all-vanadium ion redox flow. Background technique [0002] At present, the chemical power sources for large-scale energy storage are mainly lead-acid batteries, the conversion efficiency is generally about 55%, and lead-acid batteries have technical shortcomings such as large weight, low specific energy, inability to charge and discharge deeply, short service life, and environmental pollution. , so it is difficult to realize large-scale energy storage. [0003] Vanadium redox flow battery is a green and environmentally friendly battery. As energy storage power source, vanadium redox flow battery is mainly used in large-scale places such as power plants or power stations. Energy systems, as well as uninterruptible power supply or emergency power supply systems, but most of the domestic vanadium redox flow batteries are still in the labora...

AI Technical Summary

Problems solved by technology

[0005] 1. The liquid flow frame does not have a liquid flow channel or a linear liquid flow channel on the front and rear end plates. This structure is likely to cause a large leakage current in the leakage branch formed by the electrolyte, a fast corrosion rate of the bipolar electrodes, and a high voltage between the cells. Uneven distribution reduces power conversion efficiency and battery life;

[0006] 2. The carbon material electrodes currently used generally use foreign products, which are expensive and increase the product cost, while the domestic carbon material electrodes are relatively cheap, but the surface of the carbon material electrode has poor adsorption to the electrolyte, making the electrolyte reaction insufficient. , and the electrode activity and thickness uniformity are uneven, which affects the uniformity of the performance of the single battery;

[0007] 3. As one of the core components of the battery, the ion exchange membrane adopts the proton exchange membrane of foreign DuPont company with stable performance and long life, but the price is expensive, which increases the manufacturing cost of the battery structure, and its current conversion efficiency is not high. A good technical solution to solve this technical problem restricts the development of vanadium batteries;

[0008] 4. In the cycle operation state, the bipolar electrode corrosion speed is too fast due to the leakage branch current formed by the electrolyte, which greatly shortens the battery life and increases the user's use cost

Images