Vehicle heat pump air conditioning system with integrated battery thermal management function

Abstract

The invention provides a vehicle heat pump air-conditioning system with integrated battery thermal management function, which includes an air-conditioning main loop and a battery thermal management loop. The battery heat management circuit includes a battery temperature control refrigerant side branch connected to the air conditioner main circuit, and a battery temperature control aqueous solution side branch. The battery temperature control refrigerant side branch circuit includes an electric regulating valve, an intermediate heat exchanger, a first solenoid valve, and a second solenoid valve. The aqueous solution side branch includes a circulating water pump, an auxiliary electric heater, a first three-way valve, a heat recovery core of the first indoor heat exchanger, a heat recovery core of the second indoor heat exchanger, and a second three-way valve , the heat dissipation core body of the heat exchanger outside the first room, the heat dissipation core body of the heat exchanger outside the second room, and the built-in heat exchanger of the battery pack. The above-mentioned circuit is turned on so that the air-conditioning system can maintain good temperature control of the cabin, and at the same time, the air-conditioning system can be used to control and manage the temperature of the battery, and the battery heat recovery can be used to improve the performance of the air-conditioning system.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a vehicle heat pump air conditioning system with integrated battery thermal management functions. Background technique [0002] With the development of science and technology of the times, electric vehicles have gradually replaced traditional fuel vehicles as the main means of transportation. The power of the electric vehicle is provided by the on-board power battery, and the performance of the power battery is restricted by its operating temperature: on the one hand, as the temperature rises, the activity of the electrolyte increases, the ion diffusion speed increases, the internal resistance of the battery decreases, and the performance of the battery is improved. On the other hand, higher temperature will lead to electrode degradation and electrolyte decomposition, affecting the service life of the battery. In addition, in a low-temperature environment, due to the increase in ...

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Problems solved by technology

On the other hand, higher temperature will lead to electrode degradation and electrolyte decomposition, affecting the service life of the battery

In addition, in a low-temperature environment, due to the increase in the viscosity of the electrolyte, it hinders the movement of the charge carrier, affects the current generation, and affects the safety of the battery. In extreme cases, the electrolyte even freezes, causing the battery to fail to discharge and the electric vehicle to fail to start.

[0003] At present, the vehicle is generally equipped with an air conditioning system, which has a good cooling and heating temperature control effect through the circulation of the refrigerant; for electric vehicles, in addition to the vehicle air conditioning system, a separate set of batteries with auxiliary The air-cooled cold water system of the electric heater is used for battery thermal management. This system and the vehicle air conditioner are two independent refrigeration systems, which brings inconvenience to the initial investment of equipment and the comprehensive management of the vehicle thermal system.

[0004] In addition, for vehicle air conditioning units with separate dehumidification function (only dehumidification without cooling), cooling and heating need to be operated at the same time. There are two conventional solutions. One is to configure the hot gas bypass common refrigerant in the indoor heat exchanger The core body, cooling and hot gas bypass at the same time, exchange heat with the indoor side circulating air and then take over the pipeline to the inlet section of the expansion valve. The system pipeline of this scheme is more complicated and not easy to control

The other is to turn on the electric heating at the same time as the cooling to heat up. This solution is easy to control, but it will cause a huge power consumption, and the condensed water in the dehumidification condition will cause the failure of the electric heating at the same time.

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