Fuel cell device

Abstract

The invention provides a fuel cell device, which comprises a negative collector plate, a negative combined flow field cooling plate, a membrane electrode assembly, a positive combined flow field cooling plate and a positive conducting panel, which are sequentially fitted and connected with one another, wherein the membrane electrode assembly comprises an exchange membrane, a plurality of negative catalyst layers, a plurality of negative gas diffusion layers, a plurality of positive catalyst layers and a plurality of positive gas diffusion layers; the negative collector plate comprises an insulting base body and a plurality of conductive layers; each conductive layer is connected with a collector terminal through a lead; each lead between each conductive layer and each collector terminal is connected with a current sensor in series; the negative combined flow field cooling plate and the positive combined flow field cooling plate are composed of a plurality of sequentially arranged conductive region modules and insulating region modules; and the insulating region modules are arranged between the adjacent conductive region modules. According to the fuel cell device provided by the invention, practical reaction performance distribution and reaction condition distribution of various local regions in the cell can be monitored in real time.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a fuel cell device. Background technique [0002] A fuel cell is an environmentally friendly, high-efficiency, long-life power generation device. Taking the proton exchange membrane fuel cell (PEMFC) as an example, the fuel gas enters from the anode side, the hydrogen atoms lose electrons at the anode and become protons, the protons pass through the proton exchange membrane to the cathode, and the electrons also reach the cathode through the external circuit, and at the cathode Protons, electrons and oxygen combine to form water. The fuel cell converts chemical energy into electrical energy in a non-combustion manner, and its direct power generation efficiency can be as high as 45% because it is not limited by the Carnot cycle. With the battery stack as the core power generation device, the fuel cell system integrates power management, thermal management and other modules, and has the ...

AI Technical Summary

Problems solved by technology

[0006] like Image 6 Shown is the front view of the bipolar plate of the fuel cell (the flow channel is not shown), and the dotted line membrane electrode reaction area is divided into different areas from R1 to R16. Taking this figure as an example for qualitative analysis, the condition of the fuel cell without humidification The relative humidity of R1 at the inlet is the lowest, and the relative humidity of R16 at the outlet is the highest, so the proton exchange membrane at R1 is the driest and the internal resistance of the battery is the largest, resulting in the lowest performance and the fastest decay in this area; Under density operating conditions, due to the increase of generated water, the relative humidity in the R16 area often exceeds 100%, resulting in the accumulation of liquid water in the flow channel, resulting in the inability of the gas to be transported to the surface of the reaction electrode, and accelerating the performance decay of the membrane electrode

[0007] The performance degradation and life attenuation of fuel cells generally first occur in some local areas (such as the above qualitative analysis, not limited to the above analysis), while most other areas maintain good performance and service life. However, these phenomena in Under the conditions of the existing fuel cell device, it cannot be quantitatively measured experimentally (the existing fuel cell can only measure the overall output voltage of the battery under a given current condition), so it is impossible to improve the reaction conditions and performance of the local area purposefully. Significantly improve the performance and life of fuel cells

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