Fuel cell internal temperature-current density synchronous measurement sensor

Abstract

A fuel cell internal temperature-current density synchronous measurement sensor comprises sixth layers of films which are evaporated by means of vacuum evaporation coating technology. The first layer is a silicon dioxide insulation layer, the second and third layers are a film thermocouple copper coating and a film thermocouple nickel coating respectively, the fourth layer is a silicon dioxide protection layer, the fifth and sixth layers are a current density measurement copper coating and a current density measurement gold coating respectively, and leads are made by means of vacuum evaporation coating technology as well. The fuel cell internal temperature-current density synchronous measurement sensor can realize synchronous online measurement of internal temperature and current density of a fuel cell, does not require special modification on the internal structure of the fuel cell, has the advantages of simple structure, simplicity in production, small size and the like, is applicable to fuel cell flow field plates with flow channels of various shapes, and is capable of synchronously measuring internal temperature and current intensity of single position or multiple positions inside the fuel cell.

Description

technical field [0001] The invention belongs to the field of fuel cell internal parameter measurement, relates to the measurement of local current density and temperature inside the fuel cell, in particular to a temperature-current density joint measurement sensor inside the fuel cell. Background technique [0002] As an energy conversion device that directly converts chemical energy into electrical energy, fuel cells have the characteristics of high energy density, no pollution, and low noise, and have attracted widespread attention from researchers all over the world. The electrochemical reaction of the fuel cell is mainly concentrated on the membrane electrode. The speed of the electrochemical reaction determines the performance of the fuel cell, and it is affected by many factors, such as the concentration and flow rate of the reaction gas, the temperature inside the battery, humidity etc. [0003] The local current density of the fuel cell can reflect the influence of ...

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Problems solved by technology

[0004] At present, the research methods for local current density mainly include: sub-cell method, local membrane electrode method, magnetic ring group method, etc. Most of the traditional measurement methods require segmentation or special modification of the fuel cell plate or flow field plate, such as cutting Flow field plates or inserting copper rods are not only complicated to manufacture, but also easily cause the performance of the fuel cell to degrade. At the same time, the traditional method can only measure the local current density alone, which is difficult to combine with the measurement of temperature. One of the important parameters of fuel cell performance is the focus of fuel cell research

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