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Redox flow cell, redox flow cell stack and redox flow cell system

A technology of liquid flow battery and liquid flow frame, which is applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., and can solve the problems of reducing battery charge and discharge performance and service life, uneven reaction rate and heat of electrodes, etc.

Active Publication Date: 2014-03-26
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to provide a flow battery, a flow battery stack, and a flow battery system to solve the problem that the concentration of reacting substances in the electrolyte in the prior art gradually decreases with the progress of the reaction, which leads to the reaction rate and reaction generation in the electrodes. Uneven heat, which reduces the charging and discharging performance and service life of the battery

Method used

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  • Redox flow cell, redox flow cell stack and redox flow cell system
  • Redox flow cell, redox flow cell stack and redox flow cell system
  • Redox flow cell, redox flow cell stack and redox flow cell system

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Embodiment 2

[0029] The specific surface area of ​​the electrode 3 of the liquid flow battery of the second embodiment in the flow direction of the electrolyte gradually increases continuously, that is, the contact reaction area continuously increases gradually, thereby offsetting the decrease in the concentration of the reaction substance, thereby effectively It solves the problem that the concentration of the reacting substance in the electrolyte gradually decreases with the progress of the reaction, which leads to the uneven reaction rate and heat generated by the reaction at all parts of the electrode, thereby improving the charging and discharging performance and service life of the battery.

[0030] In embodiment three, the specific surface area of ​​the electrode 3 gradually increases as a continuous increase, such as Figure 5 As shown, the arrow indicates the flow direction of the electrolyte, wherein the electrode 3 and the collector plate 2 form two half-cells, the ion exchange m...

example 1

[0037] Using highly conductive porous graphite felt as the electrode material, five graphite felt electrodes with different specific surface areas but the same dimensions are integrated with the graphite current collector plate by hot pressing. The size of each graphite felt electrode is 40mm×200mm×5mm, forming a 200mm×200mm×5mm graphite felt electrode as a whole, and the specific surface area of ​​the five electrodes increases in the direction of the flow field. The charge-discharge coulombic efficiency of a single cell composed of the graphite felt electrode, the ion-exchange membrane and the current collector plate is 91.2%, the voltage efficiency is 88.9%, and the energy efficiency is 81.1%.

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Abstract

The invention provides a redox flow cell, a redox flow cell stack and a redox flow cell system, wherein the redox flow cell comprises flow frames (1), collector plates (2), an ion exchange membrane and electrodes (3); each flow frame (1) is provided with a middle passage, a liquid inlet (11) and a liquid outlet (12), and the liquid inlet (11) and the liquid outlet (12) communicate with the middle passage; the collector plates (2) are arranged in the middle passages of the flow frames (1); the ion exchange membrane is arranged between the collector plates (2), and electrolyte-containing cavities are defined by the ion exchange membrane and the collector plates (2); and the electrodes (3) are arranged in the cavities, and are so arranged that the specific surface areas are gradually enlarged along the flowing direction of electrolyte from the liquid inlets (11) to the liquid outlets (12). The invention effectively solves the problem that the reaction rate and the reaction-produced heat at each part of the electrode are ununiform because the concentration of the reaction substances in the electrolyte is gradually decreased as reaction goes on, consequently, polarization is effectively reduced in the processes of charge and discharge, the charge-discharge performance of the cell is enhanced, and the service life of the cell is prolonged.

Description

technical field [0001] The present invention relates to the field of batteries, in particular to a flow battery, a flow battery stack and a flow battery system. Background technique [0002] There are many types of flow batteries. Taking the widely used all-vanadium flow battery as an example, the all-vanadium flow battery is an electrochemical reaction device that uses vanadium ion electrolytes in different valence states for redox. Interconversion between chemical energy and electrical energy. This type of battery has the advantages of long service life, high energy conversion efficiency, good safety, and environmental friendliness. It can be used in large-scale energy storage systems for wind power generation and photovoltaic power generation. It is the main choice for power grid peak shaving and valley filling and load balancing one. Therefore, in recent years, all-vanadium redox flow batteries have gradually become the focus of research on large-capacity energy storag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M4/86H01M8/24H01M8/2455
CPCY02E60/528Y02E60/50
Inventor 汤浩殷聪谢光有王晶王荣贵胡蕴成
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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