Composite power system and control method thereof

Abstract

The invention discloses a composite power system and a control method. The composite power system comprises at least one lithium battery module, at least one low-temperature fuel cell module and at least one fuel module fixed together. The lithium battery modules, the low-temperature fuel cell modules and the fuel modules are electrically connected with a battery management unit. The fuel modulesare electrically connected with the low-temperature fuel cell modules. The low-temperature fuel cell modules are electrically connected with the lithium battery modules. The lithium battery modules are electrically connected with the fuel modules. The fuel modules provide fuel for the low-temperature fuel cell modules, and the low-temperature fuel cell modules supply power to the lithium battery modules. The power system has a compact structure and occupies small area. Through the control method of the composite power system, the composite power system has higher safety performance and is morestable in power supply, and the performance of the power system can be improved.

Description

technical field [0001] The invention relates to the technical field of compound batteries, and more specifically relates to a compound power supply system and a control method thereof. Background technique [0002] The wide application of new energy by humans has led to the rapid expansion of the secondary battery market. In the current new energy system, the requirements for secondary batteries are ubiquitous. Whether it is electric vehicles, wind energy, solar grid connection or grid peak regulation, there is an urgent need for a cheap, reliable, safe and long-life secondary battery. The secondary batteries currently developed are mainly concentrated in lithium-ion batteries, high-temperature sodium-sulfur batteries, sodium-nickel-chloride batteries and vanadium flow batteries. These batteries have their own advantages, such as long life and high energy density of lithium-ion batteries and high-temperature sodium-sulfur batteries, and vanadium redox flow batteries have t...

AI Technical Summary

Problems solved by technology

However, due to the large output response inertia of the fuel cell, frequent output current fluctuations will shorten the life of the fuel cell. In addition, the temperature has a great impact on the performance of the fuel cell. The optimum temperature is 60-80°, which requires a heating constant temperature design; therefore, the current Fuel cell systems on the market require an additional lithium battery or supercapacitor module to deal with power fluctuations and start-up of the fuel cell (startup of additional accessories such as heating, constant temperature, fuel supply, flow meter, etc.)

The lithium battery has a certain self-discharge phenomenon, and its power gradually decreases during storage. If it is idle for a long time, it may fail to start the fuel cell, which will affect the use of the power system.

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