A circular intelligent fuel cell humidifier and its humidifying method

Abstract

The invention discloses a round intelligent fuel cell humidifier, which comprises a cylindrical humidifier main body, wherein at least four humidifying areas are arranged in the humidifier main body along the axis circumference and include a fuel gas humidifying area, an oxidant gas humidifying area and at least two public humidifying areas; a plurality of humidifying units are distributed in each humidifying area; each humidifying unit comprises a cylindrical gas flow field plate, a permeable humidifying membrane and a humidifying medium flow field plate; each humidifying medium flow field plate sleeves the outer side of the corresponding permeable humidifying membrane; a plurality of gas channels are arranged on the side wall of each gas flow field plate; the gas channels are sealed through the permeable humidifying membranes; and hollow cavities between the humidifying medium flow field plates and the permeable humidifying membranes are medium channels. The gas humidifying humidity can be more effectively controlled and the utilization rate of the humidifier is more intelligently improved through system control and humidifying partition design; stabilization and improvement of the stack performance are facilitated; the performance of a fuel cell is improved; and the lifetime of the fuel cell is prolonged.

Description

Technical field [0001] The invention belongs to the field of fuel cells, and specifically relates to a humidification system of a fuel cell. Background technique [0002] The fuel cell is a device that converts the chemical energy of the fuel gas into electrical energy. Its advantages are that the product is water, zero emissions, no pollution, low noise, and high conversion efficiency. The working temperature can be operated in a low temperature environment, and it is the first choice for mobile power supply, base station power supply and fixed power supply. The fuel cell is composed of membrane electrodes, bipolar plates, collector plates, end plates and fasteners. Due to the low monolithic voltage of polymer membrane fuel cells, in practical applications, multiple battery cells are stacked together and connected in series to form a stack. The core component of the fuel cell is the membrane electrode, and the heart of the membrane electrode is the proton exchange membrane, wh...

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Problems solved by technology

In this reference document, the materials and methods for humidifying the fuel cell are improved, but it can be clearly seen from the structure of the reference document that the reference document utilizes the difference in relative humidity of the two gases to make water flow from the first gas to the In the second gas, the humidifier assembly also cannot simultaneously humidify the fuel gas and oxidant gas of the fuel cell, resulting in bloated system and increased cost

[0007] In addition to the above problems, the humidity adjustment of the existing fuel cell humidifier is not intelligent enough, and the humidity of the fuel gas cannot be adjusted by itself according to the operating conditions of the fuel cell and the output current of the stack.

For example, the publication number is CN1612396 A, which discloses a fuel cell humidification adjustment device, which includes a humidity detection unit, a humidity adjustment unit, and a humidification control unit. Compare the fixed value, and then adjust the humidity through the humidity control unit. The gas humidity needs to be adjusted externally. The control of the humidification system like this is based on the control of two humidifiers according to the operation requirements of the electric stack. Due to the high power output of the electric stack, The water produced by the cathode is more, and the water in the proton membrane is also increasing, so that the water entering the stack becomes less, especially the humidification humidity requirements of the cathode gas are getting lower and lower. Based on this operating state, the traditional use of two The fuel cell humidification system with a humidifier causes a waste of humidification capacity, resulting in an increase in the cost of the entire fuel cell system

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