A heat pump integrated fuel cell vehicle thermal management system with waste heat utilization

Abstract

The invention discloses a heat pump integrated fuel cell vehicle thermal management system with waste heat utilization, comprising a heat pump circulation loop, a motor circulation loop, a fuel cell circulation loop, and a battery pack circulation loop; Other circulation loops are connected to form an integrated thermal management system. The first plate heat exchanger is connected to the fuel cell circulation loop, the second plate heat exchanger is connected to the motor circulation loop, and the third plate heat exchanger is connected to the battery pack circulation loop. Connected; through the heat pump integrated thermal management system, the heat pump cycle can use the environment or other heat sources to assist heating the fuel cell to achieve low temperature cold start; the use of the fuel cell and motor circulating waste heat to form a multi-heat source heat pump air conditioner to improve the heat pump at low temperature The shortcomings of low energy efficiency value, And can avoid the outside heat exchanger frost.

Description

technical field [0001] The invention belongs to the field of fuel cell vehicles, and relates to an integrated thermal management system for fuel cell vehicles, in particular to a heat pump integrated fuel cell vehicle thermal management system with waste heat utilization. Background technique [0002] The proton exchange membrane fuel cell directly undergoes a chemical reaction inside the cell, thereby converting chemical energy into electrical energy. The products are only water and heat. It has the advantages of high energy conversion rate, high power density, and zero emissions. It is used in automobiles, power generation systems and Power system and other aspects have broad application prospects. In actual operation, the suitable working temperature of many low temperature proton exchange membrane fuel cells is 60 ℃ ~ 80 ℃, most of the heat of the fuel cell comes from the catalyst layer on the cathode side, and about 5% of the waste heat can be dissipated through the air...

AI Technical Summary

Problems solved by technology

[0003] The fuel cell start-up problem is one of the bottlenecks in the development of the industry. When the start-up temperature of the fuel cell is below 0°C, the water generated by the fuel cell reaction may form ice, covering the reaction gas flow channel, the catalytic layer and the membrane electrode, thus hindering the development of the fuel cell. The progress of the electrochemical reaction

At the same time, due to the volume expansion of the membrane electrode icing, the electrode structure is damaged and the performance of the fuel cell is reduced; the low-temperature cold start of the fuel cell is mostly heated by external liquid, which consumes a large amount of electric energy of the battery pack and has low thermal efficiency.

[0004] For the low-temperature heating of the fuel cell passenger compartment, most of them can only use the PTC heating system because there is no heat supply from the high-temperature engine coolant of traditional fuel vehicles, which has high reliability, but its heating coefficient is low and energy consumption is large; Realize the integration of heating and cooling, its heating coefficient COP is greater than 1, which is about twice the heating coefficient of the PTC system, and the energy consumption is small; but the ordinary heat pump air conditioner uses a single environmental heat source heat pump, and the heating efficiency is reduced in low temperature and severe cold , the external heat exchanger is prone to frost, which cannot meet the requirements of efficient and reliable operation, and still needs PTC assistance, which increases the energy consumption of the whole vehicle; in addition, the waste heat of the motor and the waste heat of the fuel cell are not effectively utilized at low temperatures, and the energy utilization rate is reduced

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