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In-situ detection method and device for electrode current density distribution of flow battery

An in-situ detection, flow battery technology, applied in the detection field, can solve the problems of battery operation interference, limited spatial resolution, complex and cumbersome, and achieve the effect of improving battery performance

Active Publication Date: 2019-05-07
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional in-situ detection methods are mainly electrical Hall sensors (J. Electrochem. Soc., 2004, 151, A394-A398), shunt resistors (J. Electrochem. ) and printed circuit boards (J.Appl.Electrochem., 1998,28,663–672), etc. These methods are relatively complex and cumbersome, and the electrical detection itself may interfere with the battery operation, affecting the detection accuracy, and the spatial resolution is limited

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  • In-situ detection method and device for electrode current density distribution of flow battery

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Embodiment 1

[0043] In situ detection of current density distribution of flow battery electrodes under different flow fields.

[0044] Such as Figure 7a As shown, first adjust the TIR system to produce a clear image S1 of the electrode; then collect the electrode image group S2 during the charging and discharging process of the flow battery, each image includes several pixels, such as points A and B in the figure, and take the Draw the light intensity-time series curve at the same pixel point of each image, and draw all pixels, Figure 7a Curve S3 drawn for pixel point B in . It can be seen that the light intensity curve at point B corresponds to the charging and discharging process and changes periodically. According to the relationship between the total reflection angle and the current density and the total reflection angle and the light intensity, the light intensity-time series curve is converted into the current density absolute value-time curve S4. In the experiment, the absolute...

Embodiment 2

[0047] In situ detection of electrode activity differences across different electrodes.

[0048] In the case of ensuring that the flow field distribution of the electrolyte remains unchanged, replace electrodes with different activities. In this embodiment, carbon felts are used as electrodes, and three carbon felts with different activities are replaced. For each carbon felt, Figure 7a Steps to obtain the current density map of the electrode, and then obtain the current density distribution maps R1, R2, R3 of three different activated carbon felts. Then the influence of the flow field distribution of the electrolyte is removed respectively, and the current density distribution diagrams RD1, RD2 and RD3 influenced by different electrode activity distributions are obtained. Figure 7c In , the change of the thickness of the lines indicates that there is a difference in the carbon felt activity.

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Abstract

The invention provides an in-situ detection method and device for electrode current density distribution of a flow battery. A total internal reflection optical system is adopted for imaging the electrode surface of the flow battery; and according to light intensity changes of different positions in the image, the electrode current density distribution condition is obtained. The optical total reflection system is seamlessly matched with the flow battery; the in-situ detection of electrode surface imaging and current density in a running process of the battery is realized; the two-dimensional distribution and evolution processes of the electrode current density under different conditions are obtained; and an in-situ detection tool is provided for improving the battery performance.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to an in-situ detection method and device for the current density distribution of electrodes of a flow battery. Background technique [0002] Energy storage technology is an important part of the new energy system. As a large-scale energy storage technology, flow batteries have the characteristics of high capacity and long life. Therefore, optimizing the performance of flow batteries is a common goal in the industry. Existing research methods mostly give the overall average performance of the battery through testing, and cannot clarify the impact of local spatial distribution differences on battery performance. [0003] The local current density distribution is an intuitive factor to characterize the electrode reaction rate and battery sustainability, which is mainly affected by the spatial activity distribution of the electrode and the flow field distribution of the electrolyte....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385
Inventor 刘乐马凯捷张雨浓席靖宇何永红
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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