Redox flow cell stack

A technology of liquid flow batteries and electric stacks, which is applied to battery electrodes, fuel cells, circuits, etc., can solve the problems of battery system overall efficiency decline, electrode overvoltage, and electric stack scrapping, etc., and achieve faster hydrogen ion transmission and faster response Speed ​​up and improve the effect of stability

Inactive Publication Date: 2017-02-22
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the current density in the charging and discharging process, this voltage deviation will increase exponentially, and the voltage inhomogeneity between the single cells will cause the flow battery system to make the first and last electrodes of the stack in the long-term operation. Occurrence of different degrees of overvoltage phenomenon and burnout, resulting in a decrease in the overall efficiency of the battery system, and the battery stack is scrapped and cannot be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 The first and last cells use bipolar plates with higher conductivity

[0030] Voltage range test method: Connect the assembled cell stack with the electrolyte circulation system and the battery management system, charge and discharge it at a fixed current density, and record the last charge after multiple charge and discharge cycles. The voltage of the discharge cycle is extremely poor. The specific method is to record the actual voltage value of each single battery when the battery is charged to a certain voltage value during the charging process (for example: the all-vanadium redox flow battery is 1.50V average voltage multiplied by the number of single cells), and all The voltage difference between the two single cells with the maximum voltage and the minimum voltage in the single cell is the voltage range of the stack at the corresponding current density.

[0031] Table 1

[0032]

[0033] The specific parameters of the electric stack of embodiment 1 ...

Embodiment 2

[0039] Example 2 The bipolar plates of the first and last single cells are treated by electrochemical deposition

[0040] table 3

[0041] Part Name performance characteristics power 20kW configuration solution 1.0mol / L sulfuric acid / hydrochloric acid mixed acid system vanadium electrolyte Number of cells 46 knots Collector plate copper plate electrode Thickness 5.5mm bipolar plate The thickness is 1.5mm, and the first and last sections are treated with electrochemical deposition ion conducting membrane Thickness 150μm, surface resistance 0.5Ω / cm 2 .

[0042] The specific parameters of the stack in Example 2 are shown in Table 7. A 46-cell stack is used. The single cells of the stack are connected in series, the thickness of the ion-conducting membrane is 150 μm, and the measured value of the surface resistance is 0.5 Ω / cm 2 . The first and last bipolar plates are treated with chemical deposition catalyst, and the ...

Embodiment 3

[0051] Example 3 The first and last cells use bipolar plates with relatively high roughness

[0052] Table 6

[0053]

[0054] The specific parameters of the battery stack in Example 3 are shown in Table 6. The assembled 1kW battery stack is connected to the electrolyte circulation system and the battery management system, and the battery is charged at 150mA / cm 2 Charge and discharge at the current density. When the battery runs stably for 19 charge-discharge cycles, record the voltage extreme difference at the end of the 20th charge-discharge cycle.

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Abstract

The invention discloses a redox flow cell stack. The redox flow cell stack is formed by connecting a plurality of single batteries in series, wherein each single battery comprises a bipolar plate, an electrode, an electrode frame and an ion conduction film, and in the cell stack, a part structure comprising the single battery at an initial section and/or a tail section is different from a part structure comprising other single batteries. By improving the structures of the batteries at the initial section and the tail section, the bipolar plate of the single battery at the initial section or the tail section is changed to a material with relatively small conductivity and relatively large roughness, the ion conduction film of the battery at the initial section or the tail section is changed to a film material with relatively small resistance and more excellent performance, so that the voltage range of the refox flow cell stack is effectively reduced, the voltage consistency of the single battery in the cell tack is greatly improved, the unfavorable influence on a battery system due to long-term running of the cell stack in a relatively high voltage range is prevented, and the long-term running stability of the battery system is improved.

Description

technical field [0001] The invention relates to the field of manufacturing liquid flow batteries, in particular to a liquid flow battery electric stack. Background technique [0002] The increasing demand for traditional energy in the development of modern economy and society has made the problem of insufficient supply increasingly prominent. People have to look for renewable energy such as wind energy and solar energy. In recent years, new energy represented by wind energy and solar energy has occupied a place in energy supply. With the increase of demand, the proportion is still increasing, but it is affected by the weather. The contradiction between supply and demand that causes intermittent power generation is relatively prominent, and the development of large-scale energy storage is imperative. [0003] As a way of large-scale energy storage--the production and development of flow batteries provide a good supplement for the above-mentioned defects of new energy sources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/249H01M4/86
CPCH01M4/86H01M8/249Y02E60/50
Inventor 张涛张华民邹毅高新亮李颖
Owner DALIAN RONGKE POWER
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