Fuel cell cooling flow field plate

Abstract

The invention discloses a fuel cell cooling flow field plate, wherein the outer wall of the flow field plate has a circular shape; a flow field plate outer ring is arranged on the periphery of the outer wall of the flow field plate; a variable-diameter inlet flow channel is arranged on the upper side of the flow field plate; a variable-diameter outlet flow channel is arranged on the lower side of the flow field plate; the width dimension of each variable-diameter structure is greater than that of the corresponding inlet or outlet flow channel; and a cylindrical cooling flow channel is arranged on one side in the cooling flow field plate. The inlet flow channel and the outlet flow channel are variable-diameter structures so as to avoid the negative pressure caused by the backflow of a coolant at an outlet. The regularly distributed cylindrical cooling flow channel is arranged inside the flow channel so that the coolant can be evenly distributed at various positions in the flow channel, achieves uniform heat exchange with various positions of a bipolar plate, and has low flow resistance. The fuel cell cooling flow channel provided by the invention can improve the cooling effect of the cooling flow field plate, improves the power generation efficiency and durability of a fuel cell, makes the distribution of the coolant uniform, reduces local hot spots, and reduces the flow resistance of the coolant.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a fuel cell cooling flow field plate. Background technique [0002] Proton exchange membrane fuel cell is a kind of low temperature fuel cell, its operating temperature is generally 60-85 ℃, because of its low operating temperature, high power density, fast cold start, no corrosion, compact structure and other advantages are widely used in electric vehicles. Uniform temperature distribution is very important to the working performance and service life of proton exchange membrane fuel cells. In the proton exchange membrane fuel cell, about 50% of the chemical energy is converted into heat during the electrochemical power generation process. If it cannot be discharged in time, this reaction heat will overheat the proton exchange membrane and reduce the working performance and durability of the fuel cell. Generally, high-power proton exchange membrane fu...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a fuel cell cooling flow field plate to solve the problems in the prior art that the cooling effect of the cooling channel is not ideal and the flow pressure loss of the cooling liquid is large

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