Kilowatt fuel cell/lithium-ion battery hybrid power device and its energy management method

Abstract

The invention discloses a kilowatt-scale fuel cell / lithium-ion cell hybrid power device and an energy management method thereof. The device comprises a fuel cell power supply loop, a lithium-ion cell power supply loop, a fuel cell power control unit and a lithium-ion cell power control unit. Compared with the prior art, according to the kilowatt-scale fuel cell / lithium-ion cell hybrid power device and the energy management method thereof provided by the invention, an energy management is carried out on the fuel cell and the lithium-ion cell when reliable power supply on a load is ensured; the service lifetime of the two cells is prolonged; and the security coefficients of the two cells are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a kilowatt fuel cell / lithium ion battery hybrid power device and an energy management method thereof. Background technique [0002] In recent years, the extensive use of fossil fuels by humans has led to serious pollution problems. Coupled with the decreasing fossil energy such as coal and oil, the global energy shortage and environmental protection problems have become increasingly prominent. Therefore, it is of great significance to develop clean and environmentally friendly new energy sources. Hydrogen energy is an environmentally friendly energy source, and its emissions are generally water, without CO2 and other harmful substances. A fuel cell is an energy conversion device that uses hydrogen energy to directly convert the chemical energy of hydrogen-rich gas into electrical energy. A fuel cell is a power generation device that converts the chemical energy of the reacting substanc...

AI Technical Summary

Problems solved by technology

However, when the power required by the load changes greatly, the output characteristics of the fuel cell cannot meet the requirements of rapid load changes

Due to the shortcomings of fuel cells such as soft characteristic curves and slow power response, it is not suitable for direct power supply to loads such as vehicles with frequent power changes.

[0003] In the existing fuel cell / lithium-ion battery hybrid power system, the lithium-ion battery pack is directly connected to the output DC bus of the fuel cell cascaded DC / DC converter. Although this hybrid power configuration reduces the impact on fuel cell power and dynamic Performance requirements, but lack of better energy management for hybrid power systems and effective management of lithium-ion batteries, resulting in chaotic lithium-ion battery charge and discharge cycles, reducing battery life and system performance

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