Redox flow battery electric stack and method for uniformly distributing electrolyte in each section of battery to improve battery performance

A liquid flow battery and electrolyte technology, which is applied in the direction of fuel cell grouping, fuel cells, circuits, etc., can solve the problems of different electrolyte flow, small electrolyte flow, and battery performance degradation, so as to reduce the extreme difference and prolong the service life , the effect of improving energy efficiency

Active Publication Date: 2017-07-04
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of the length of the common flow channel, the electrolyte flow rate and inlet pressure of each single cell are different, resulting in different flow rates of the electrolyte solution flowing into each single cell. cause extremely bad phenomenon
If the range is too large and the overpotential is too high, it will cause the performance of the battery to decline

Method used

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  • Redox flow battery electric stack and method for uniformly distributing electrolyte in each section of battery to improve battery performance
  • Redox flow battery electric stack and method for uniformly distributing electrolyte in each section of battery to improve battery performance
  • Redox flow battery electric stack and method for uniformly distributing electrolyte in each section of battery to improve battery performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 (Different electrolyte flow channel depth)

[0034] Table 4

[0035] Parameter item Performance characteristics power 10kW Configuration solution 1.8mol / L sulfuric acid system vanadium electrolyte Cell number 30 knots Electrode frame distribution channel Initial flow channel depth 1.55mm, tolerance 0.01mm

[0036] The specific parameters of the stack are shown in Table 4. A 30-cell stack is used, and the single cells of the stack are connected in series. From the first section to the last section, the distribution channel depth of the electrode frame changes as follows: Distribution flow of the inlet electrode frame The track depth is 1.55mm, and thereafter it will increase in the form of an arithmetic sequence with a tolerance of 0.01mm. Connect the assembled 10kW stack with the electrolyte circulation system and battery management system, and use 110mA / cm 2 Charge and discharge at the current density of the battery. When the battery runs stably for 50 cha...

Embodiment 2

[0043] Example 2 (Different diameters of the common flow channel of the electrode frame)

[0044] Table 6

[0045] Parameter item Performance characteristics power 10kW Configuration solution 1.8mol / L sulfuric acid system vanadium electrolyte Cell number 30 knots Common flow channel for electrode frame The entrance diameter is 15mm, the exit diameter is 20mm, and the arithmetic sequence increases

[0046] The specific parameters of the stack are shown in Table 6. A 30-cell stack is used, and the single cells of the stack are connected in series. From the first section to the last section, the diameter of the common flow path of the electrode frame changes as follows: The diameter of the common flow channel of the frame is 15mm, the diameter of the common flow channel of the electrode frame of the last battery is 20mm, and the diameter of the common flow channel of the middle electrode frame increases in an arithmetic sequence. Connect the assembled 10kW stack with the elec...

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Abstract

The invention discloses a redox flow battery electric stack and a method for uniformly distributing an electrolyte in each section of battery to improve battery performance. In the redox flow battery electric stack, the depth of an allocation runner of each section of battery is gradually increased from a public runner inlet, and / or the diameter of the public runner is gradually increased in an arithmetic progression manner from the public runner inlet. With the adoption of the redox flow battery electric stack, the electrolyte flow quantity flowing into each single battery is consistent, the linear speed of the electrolyte is 0.05-0.08m / s, the concentration of the electrolyte is 1.5-2mol / l, the inlet pressure of the electric stack is 0.5-1.5bar, and the running temperature of the electric stack is 30-40 DEG C. By the two methods, the electrolyte flow quantity flowing into each section of battery can be effectively maintained consistent, so that the range is reduced, the concentration range is reduced, the utilization ratio of the electrolyte is improved, and the battery efficiency is improved. By the scheme, the electrolyte is uniformly distributed on an electrode surface and flows rapidly, so that the energy efficiency of an all-vanadium redox flow battery is effectively improved, and the service lifetime of the battery is prolonged.

Description

Technical field [0001] The invention relates to a flow battery stack and a method for uniformly distributing electrolyte in each battery to improve battery performance. Background technique [0002] Energy progress is the direct driving force for the development of social productivity. With the rapid development of economy and society, traditional fossil energy has long been unable to meet the needs of today's human development, and has caused a large amount of carbon dioxide emissions, which has a huge impact on the environment. All the time, various countries have begun to study various new energy sources. Among them, the large-scale utilization of wind, solar and nuclear energy is the main focus. The all-vanadium redox flow battery uses vanadium ion solutions of different valences as the active materials for the positive and negative electrodes, which are stored in their respective electrolyte storage tanks. When charging and discharging the battery, the electrolyte is drive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/24H01M8/2475
CPCH01M8/24Y02E60/50
Inventor 江杉张华民马相坤姜宏东盛伟陈业明
Owner DALIAN RONGKE POWER
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