Combined heat and power system for electric vehicle fuel battery and control method of thermoelectric combined supply system

Abstract

The invention discloses a combined heat and power system for an electric vehicle fuel battery and a control method of the thermoelectric combined supply system. An electric vehicle comprises a fuel battery system, a power battery system and a drive motor, wherein the fuel battery system adopts a hydrogen fuel battery; and the hydrogen fuel battery supplies power to the drive motor through an inverter after being connected to the power battery in the battery system in parallel. The invention further discloses a control method of the combined heat and power system. According to the technical scheme, the electric vehicle endurance problem is effectively solved, and the fuel battery continuously charges the whole vehicle power system after SOC is lower than certain value; while meeting the requirement of providing electric energy to the whole vehicle, the fuel battery further continuously supplies heat to a passenger compartment and the power battery system under a low-temperature condition; and the hydrogen oxygen fuel battery is taken as a reaction device, so that the combined heat and power system is clean, is environmentally friendly, is free of pollution, is rich in hydrogen gas reserve volume, is wide in source, is small in fuel battery noise, and is low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of new energy fuel cells, and in particular relates to a combined heat and power system in which fuel cells are used for power supply of electric vehicles, heating of passenger cabins, and low-temperature heating of power battery systems. In addition, the present invention also relates to a control method of the combined heat and power system. Background technique [0002] At present, electric vehicles have the following problems: the charging and discharging performance of the battery is poor at low temperature; Due to the limitation of this kind of polarization, the current power generation efficiency of fuel cells is about 40% to 60%. [0003] With the rapid development of human society, the demand for fossil energy is increasing day by day, and people are facing the challenges of resource depletion and environmental problems. A fuel cell is a device that directly converts chemical energy into electrica...

AI Technical Summary

Problems solved by technology

[0002] At present, electric vehicles have the following problems: the charging and discharging performance of the battery is poor at low temperature; Due to the limitations of this kind of polarization, the current power generation efficiency of fuel cells is about 40% to 60%.

In this system, temperature has a great influence on the charging and discharging performance of the lithium-ion power battery system, especially when charging the power battery system at low temperature, Li+ migrated from the positive electrode will not have time to embed into the carbon layer of the negative electrode. In the process, lithium metal crystals are formed at the negative end, and the gradual increase of the crystals may cause the diaphragm to penetrate and cause a short circuit, causing irreversible damage to the lithium-ion battery; at the same time, when discharging at low temperature, due to the high internal resistance of the battery at low temperature , will cause the battery to fail to fully discharge the power when it reaches the discharge cut-off voltage, which will have a great impact on the power output of the vehicle

[0006] In addition, most electric vehicles turn on the air conditioner to heat the passenger compartment, which consumes a lot of electricity and greatly shortens the cruising range of electric vehicles.

Pure electric vehicles generally use PTC heating as the whole vehicle heating, heating for a long time, consumes a lot of power, and at the same time the vehicle is in a low temperature environment for a long time, the internal temperature of the battery system will be relatively low, and low temperature has a great impact on the charging and discharging performance of the battery system

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