A compact intelligent fuel cell humidification system and humidification method thereof

Abstract

The invention discloses a compact type intelligent fuel cell humidifying system. The compact type intelligent fuel cell humidifying system comprises electromagnetic change valves, a pipeline and a humidifier for supplying a humidifying gas to a fuel cell stack, wherein the humidifier comprises four humidifying regions which are laminated into one body; each humidifying region comprises multiple groups of humidifying units; a humidifying channel which is used for realizing exchange between a dry gas and a humidifying medium is arranged in each humidifying unit, wherein an A humidifying region is a fuel gas humidifying region; B and C humidifying regions are shared humidifying regions for a fuel gas and an oxidizing agent gas; and a D humidifying region is a humidifying region for the oxidizing agent gas. According to the compact type intelligent fuel cell humidifying system, the gas humidifier is divided into four humidifying regions according to the magnitude of the output current and the operating conditions; the area of a positive electrode gas humidifying region is adjusted according to the output current of the electric stack so as to adjust the humidity of the negative electrode gas; the rest regions are used for humidifying a positive electrode gas, so that the humidifier can work under all kinds of working conditions; and therefore, the humidity requirement of the fuel cell is satisfied, and the humidifying efficiency of the fuel cell humidifier is improved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a humidification system for fuel cells. Background technique [0002] A fuel cell is a device that converts the chemical energy of fuel gas into electrical energy. Its advantages are that the product is water, zero emission and no pollution, low noise, and high conversion efficiency. The working temperature can operate in low temperature environment, it is the first choice for mobile power supply, base station power supply and fixed power supply. A fuel cell is composed of membrane electrodes, bipolar plates, collector plates, end plates and fasteners. Due to the low voltage of a single polymer membrane fuel cell, 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, which mainly pl...

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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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