Multi-stack integrated long-life fuel cell system

Abstract

The invention provides a multi-stack integrated long-life fuel cell system, and belongs to the technical field of fuel cell engines. The multi-stack integrated long-life fuel cell system comprises a hydrogen subsystem, an air subsystem, a thermal management subsystem, an engine control module and a plurality of power output sub-modules connected in parallel and composed of stacks and DC-DC modules. The positive electrodes and the negative electrodes of the stacks are connected with the input ends of the corresponding DC-DC modules, and the output ends of the DC-DC modules are connected to a same group of lines; the hydrogen subsystem, the air subsystem and the thermal management subsystem are all connected with the stacks; the engine control module controls the N stack with the sum of the maximum output power meeting the maximum power requirement to work according to the maximum power requirement of a fuel cell automobile, other stacks are closed, and the hydrogen flow, the air flow and the cooling liquid flow entering all the stacks and the input currents of the corresponding DC-DC modules are proportionally adjusted according to the attenuation degree of all the stacks, so that different power requirements of the fuel cell automobile can be met.

Description

technical field [0001] The invention belongs to the technical field of fuel cell engines, and in particular relates to a multi-stack integrated long-life fuel cell system. Background technique [0002] As the problems of the traditional energy industry become increasingly prominent, new energy sources develop rapidly. Compared with other energy sources, hydrogen energy has the characteristics of large reserves, high energy ratio, low pollution, and high efficiency. It has been highly valued by countries all over the world and is considered to be the clean energy with the most development potential in the 21st century. The proton exchange membrane fuel cell is an important application scenario of hydrogen energy. Air and hydrogen are respectively passed through the cathode and anode on both sides of the proton exchange membrane. Reacts with electrons and hydrogen protons to form water. During the reaction process, electrons pass through wires to generate current in the peri...

AI Technical Summary

Problems solved by technology

At this time, if the performance of a certain stack is poor, the output current will be limited to a low level, and the stack will become the "short board" of the fuel cell stack module, limiting the power output of the entire fuel cell engine. At low power, if this power cannot meet the needs of fuel cell vehicles, the engine will have to be replaced, which will further reduce the durability of the fuel cell engine

When the fuel cell system is applied to high-power equipment, such as heavy-duty trucks, high-power ships, and rail transit, the rated power of the fuel cell system may reach hundreds of kilowatts. figure 2 In the power output mode shown, it will be found that there are serious problems in the design and control mode of the existing fuel cell engine stack module, which makes the durability of the fuel cell engine poor and seriously restricts the commercialization of fuel cell vehicles.

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