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Vanadium redox battery and electrolyte rebalancing method thereof

A vanadium battery and cathode electrolyte technology, which is applied in fuel cells, electrolyte flow processing, regenerative fuel cells, etc., can solve problems such as vanadium ion concentration imbalance, to promote valence balance and quantity balance, reduce gaps, and relieve vanadium ion concentration. The effect of concentration imbalance

Active Publication Date: 2014-04-30
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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Problems solved by technology

[0012] The present invention aims to provide a vanadium battery and a method for rebalancing its electrolyte, so as to solve the problem of vanadium ion concentration imbalance in the positive and negative electrolytes produced by the vanadium battery in the prior art after a long period of work

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Embodiment Construction

[0045] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0046] As introduced in the background technology section, vanadium batteries have a problem of unbalanced concentration of vanadium ions in positive and negative electrolytes after working for a long time. In order to solve this problem, the inventor of the present invention provides a vanadium battery. This vanadium battery includes a battery stack 10, a positive electrode electrolyte storage tank 20 and a negative electrode electrolyte storage tank 30, and the positive electrode electrolyte storage tank 20 and the battery stack 10 connected to form a first circulation loop, and the negative electrode electrolyte storage tank 30 is connected to the battery stack 10 to form a second circulation loop...

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Abstract

The invention discloses a vanadium redox battery and an electrolyte rebalancing method thereof. The vanadium redox battery comprises a battery stack, an anode electrolyte storage tank which is connected with the battery stack to form a first circulation loop, and a cathode electrolyte storage tank which is connected with the battery stack to form a second circulation loop, wherein the vanadium redox battery also comprises a low-valence vanadium ion solution supply device used for feeding a low-valence vanadium ion solution into the anode electrolyte storage tank, low-valence vanadium ions being divalent vanadium ions and / or trivalent vanadium ions; a high-valence vanadium ion solution recovery device used for recycling extra high-valence vanadium ion solution in the anode electrolyte storage tank, high-valenceions being tetravalent vanadium ions and / or pentavalent vanadium ions. In the vanadium redox battery, the low-valence vanadium ion solution supply device can feed low-valence vanadium ions into the anode electrolyte storage tank, so as to neutralize the pentavalent vanadium ions in the vanadium ions. The high-valence vanadium ion solution recovery device can recycle the high-valence vanadium ion solution left in the anode electrolyte, so as to lower the difference between the molar quantities of vanadium ions in the anode electrolyte and the cathode electrolyte.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, in particular to a vanadium battery and a method for rebalancing its electrolyte. Background technique [0002] All-vanadium redox flow battery (vanadium battery) is a new type of electrochemical energy storage system, which has the advantages of large power, large capacity, high energy conversion efficiency, long service life, high safety and environmental protection. Large-scale energy storage systems supporting wind power generation, smart grid peak regulation, communication base stations, and distributed power sources have broad application prospects. [0003] The electrolyte is the active material of the vanadium battery, which directly determines the storage capacity of the battery system. In the electrolyte of the vanadium battery, vanadium ion solutions with different valence states are used as the electrolyte, and sulfuric acid solution is used as the supporting electrolyte. Wherei...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M8/04
CPCY02E60/528H01M8/04201H01M8/04276H01M8/0482H01M8/188Y02E60/50
Inventor 高艳汤浩房红琳杜坤殷聪周正
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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