Measurement inserting piece for heat flow density and current density distribution in fuel cell

Abstract

A measurement inserting piece for heat flow density and current density distribution in a fuel cell is a measurement device for heat flow density and current density distribution in the fuel cell. A flow density-current density combined measurement sensor is arranged on a rib between every two adjacent leaking seams of a conductive substrate, each flow density-current density combined measurement sensor is evaporated through a vacuum evaporation coating method and is formed by seven layers of films, leads used for transmitting electrical signals of the flow density-current density combined measurement sensors are also manufactured through the vacuum evaporation coating method, extend to the edges of the conductive substrate and form pins at the edges, so that the conductive substrate can be connected with an external circuit conveniently. The measurement inserting piece for heat flow density and current density distribution in the fuel cell achieves synchronous on-line measurement of heat flow density and current density distribution in the fuel cell, can be installed in the fuel cell as an independent component, and is simple in structure, convenient to manufacture, wide in use range and suitable for a flow field plate with parallel flow passes or S-shaped flow passes or staggered flow passes or flow passes of other shapes, of the fuel cell, and particular modification of the structure of the cell is not needed.

Description

technical field [0001] The invention relates to an insertion piece for measuring heat flux density-current density distribution inside a fuel cell, and belongs to the technical field of fuel cell detection. Background technique [0002] Fuel cell is an advanced technology for hydrogen energy utilization. Its performance is affected by various factors, such as the choice of fuel cell operating conditions, structural design, internal parameter control, etc. Therefore, how to effectively improve the performance of fuel cells is subject to attention of more and more researchers. [0003] The heat transfer inside the fuel cell affects the distribution of its internal heat flux, and the heat flux distribution has an important impact on the electrochemical reaction on the membrane electrode and the heat and mass transfer inside the battery; the speed of the electrochemical reaction on the membrane electrode It will also affect the uniformity of the local current density distributi...

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Problems solved by technology

[0004] Due to the compact structure of the fuel cell, it is difficult to measure the distribution of internal heat flux density and current density. It is often necessary to make special modifications to the structure of the fuel cell to implant sensors for measurement. For example, the measurement methods of current density mainly include sub-cell method, partial membrane electrode method, magnetic ring group method, etc. Most of these methods require special processing and transformation of the pole plate or flow field plate of the fuel cell or the membrane electrode assembly Segmentation is not only difficult to process, complicated process, high production cost, but also has a certain impact on the stability of fuel cell performance. At the same time, its processing and transformation of fuel cells is only applicable to the measurement of current density. To further modify the fuel cell or make another fuel cell

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