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Flow battery stack structure

A technology of liquid flow batteries and electric stacks, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of the overall efficiency of the battery system, electrode overvoltage, scrapping of electric stacks, etc., so as to reduce the assembly and production costs of electric stacks, Effects of improving voltage efficiency and improving conductivity

Active Publication Date: 2019-11-26
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

[0026] Example 1 The electrodes of the first and last cells are different from the electrodes of other cells

Embodiment 11

[0027] Example 1.1 Thinning the Electrode Thickness of the First and Last Cells

[0028] 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.

[0029] Table 1

[0030] parameter item performance characteristics power 2kW con...

Embodiment 12

[0037] Example 1.2 Thicken the electrode thickness of the first and last cells

[0038] Example 1.2 The specific parameters of the stack structure of the liquid flow battery are shown in Table 3:

[0039] table 3

[0040] parameter item performance characteristics power 10kW

[0041] configuration solution 2mol / L sulfuric acid / hydrochloric acid mixed acid system vanadium electrolyte Solution volume 800L(15kWh) Number of cells 40 knots Collector plate copper plate electrode The thickness of the first and last section is 7.5mm, and the thickness of other sections is 6.5mm; bipolar plate Thickness 2mm ion conducting membrane Thickness 120um Electrode frame Thickness 4.5mm

[0042] Connect the assembled 10kW stack to the electrolyte circulation system and the battery management system, and use 80mA / cm 2 The current density of the battery is charged and discharged. When the battery runs stably f...

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Abstract

The present invention discloses a flow battery stack structure, which 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 conducting membrane, and the structure of the member for forming the first single battery and / or the last single battery is different from the structure of the member for forming other single batteries. According to the present invention, the electric conductivity of the first single battery and the last single battery can be improved and the contact resistance between the electrode and the bipolar plate can be reduced by changing the compression ratio of the first single battery to the last single battery, and the electrolyte distribution uniformity of the first single battery and the last single battery can be improved and the concentration difference polarization and the flowing resistance of the electrolyte in the electrode can be reduced by changing the electrode frame structures of the first single battery and the last single battery, particularly changing the electrode frame thickness, the electrolyte distribution port number and the area, such that with the improvements, the voltage pole difference of the flow battery stack structure is effectively reduced, the single battery voltage uniformity in the stack is substantially improved, the negative impact of the long-term operating of the stack under the high voltage pole difference on the battery system is avoided, and the long-term operation stability of the battery system is improved.

Description

technical field [0001] The invention relates to the field of manufacture of liquid flow batteries, in particular to the electric stack structure of the liquid flow battery. 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 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/249
CPCH01M8/249Y02E60/50
Inventor 高新亮张华民许晓波王晓丽杨振坤李颖刘若男王明君赵叶龙宋玉波
Owner DALIAN RONGKE POWER
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