Heating heat management system for plug-in hybrid electric vehicle

Abstract

A plug-in hybrid electric vehicle heating heat management system comprises a compressor, a high-temperature and high-pressure refrigerant outlet of the compressor is connected with an external heat exchanger, and an outlet of the external heat exchanger is divided into two paths which are connected with a battery cooling plate heat exchanger and an HVAC respectively. The other end of the HVAC returns to the compressor through the gas-liquid separator; the battery cooling plate heat exchanger is arranged in a refrigerating and heating pipeline of a battery in series, the refrigerating and heating pipeline further comprises a battery heating plate heat exchanger connected with the battery cooling plate heat exchanger in series, and the two ends of the battery heating plate heat exchanger are connected to the water outlet end of an engine and the water return end of the engine respectively. A warm air core body in the HVAC is also connected to the water outlet end of the engine and the water return end of the engine. The system can achieve the functions of battery heating, driving heating, engine preheating and the like under the low-temperature condition, on one hand, engine waste heat can be fully utilized for heating batteries and driving, and on the other hand, the engine preheating waiting time can be shortened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of new energy automobile battery management, concretely relates to a kind of plug-in hybrid car heating thermal management system. BACKGROUND

[0002] The existing hybrid vehicle needs battery heating or cab heating at low temperature, generally adopts PTC heater mode.But the plug-in hybrid vehicle generally exists with low electric quantity, and PTC heater affects pure electric cruising range.At the same time, when starting engine at low ambient temperature, engine waste heat also needs to be carried out, and vehicle can be driven and engine waste heat is used to heat cab and battery after engine water temperature rises.It needs to wait for a long time.

[0003] The existing pure electric light truck thermal management system can meet the demand of customer for basic use of vehicle to some extent, but still has obvious defects:

[0004] 1, battery heating and cab heating are carried out using PTC, which leads to reduction of cruising range of whole vehicle in pure electric mode;

[0005] 2, in the case where ambient temperature is low, engine preheating time is long, and long waiting time is needed. INVENTION CONTENTS

[0006] The technical problem to be solved by the utility model is: how to provide a heating thermal management system suitable for plug-in hybrid car.

[0007] To solve the above problems, the utility model is realized by the following technical scheme:

[0008] A kind of plug-in hybrid car heating thermal management system, including compressor, high temperature high pressure refrigerant outlet of compressor is connected with vehicle outer heat exchanger, the outlet of vehicle outer heat exchanger is divided into two ways, and is connected with battery cooling plate heat exchanger and HVAC respectively;HVAC other end is returned to compressor by gas-liquid separator;

[0009] The battery cooling plate heat exchanger is connected in series in the refrigeration and heating pipe line of battery, and the battery heating plate heat exchanger connected in series with the battery cooling plate heat exchanger is also included in the refrigeration and heating pipe line, two ends of the battery heating plate heat exchanger are connected to engine water outlet end and engine return water end respectively, and at the same time, warm air core body in HVAC is also connected to engine water outlet end and engine return water end respectively.

[0010] Battery heating plate heat exchanger and warm air core body are connected in parallel, and then electric energy storage body is connected in series.

[0011] Engine water outlet temperature sensor is connected in series at engine water outlet end.

[0012] The battery heating plate heat exchanger is connected with one port of the three-way flow regulating valve, and the other two ports of the three-way flow regulating valve are connected with the warm air core and the engine water outlet respectively.

[0013] The HVAC comprises an HVAC air conditioning box, and a cold air core and a warm air core located in the HVAC air conditioning box; wherein the vehicle outside heat exchanger is connected with the cold air core, and the other end of the cold air core returns to the compressor through a gas-liquid separator.

[0014] A return air temperature sensor is arranged at the cold air core, and an environment temperature sensor is arranged at the vehicle outside heat exchanger.

[0015] The outlet of the vehicle outside heat exchanger is divided into two paths, one of which is connected with the battery cooling plate heat exchanger through an electronic expansion valve, and the other of which is connected with the cold air core through a thermal expansion valve.

[0016] The battery refrigeration and heating pipeline comprises a battery, a battery cooling plate heat exchanger, a battery heating plate heat exchanger, an expansion tank and a circulating water pump connected in series.

[0017] The battery heating plate heat exchanger is provided with a battery liquid cooling circuit inlet and a battery liquid cooling circuit outlet, and a battery liquid cooling outlet temperature sensor and a battery liquid cooling return water temperature sensor are further arranged in series in the refrigeration and heating pipeline.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the functions of battery heating, driving heating and engine preheating under low temperature conditions can be realized, on one hand, the engine waste heat can be fully utilized to heat the battery and the driving, on the other hand, the waiting time of engine preheating can be reduced.

[0019] The utility model can cancel the battery heating and driving cabin heating PTC, meanwhile, using the electric energy accumulator does not consume the electric energy of the battery itself, and does not affect the pure electric endurance of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the heating principle diagram of the utility model;

[0021] Figure 2 It is the system diagram of the utility model. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figure 1 As shown, a heating thermal management system for a plug-in hybrid vehicle includes a compressor 11. The high-temperature and high-pressure refrigerant outlet of the compressor 11 is connected to an external heat exchanger 12. The outlet of the external heat exchanger 12 is divided into two paths, which are respectively connected to a battery cooling plate heat exchanger 4 and an HVAC system. The other end of the HVAC system returns to the compressor 11 through a gas-liquid separator 10.

[0025] The battery cooling plate heat exchanger 4 is connected in series in the cooling and heating pipeline of the battery 2. The cooling and heating pipeline also includes a battery heating plate heat exchanger 5 connected in series with the battery cooling plate heat exchanger 4. The two ends of the battery heating plate heat exchanger 5 are respectively connected to the engine water outlet 15 and the engine water return 16. Simultaneously, the heater core 14 in the HVAC system is also connected to both the engine water outlet 15 and the engine water return 16. It should be noted that the engine water outlet 15 is connected to the engine water outlet pipe, and the engine water return 16 is connected to the engine water return pipe.

[0026] Furthermore, the battery heating plate heat exchanger 5 is connected in parallel with the warm air core 14, and then connected in series with the electric energy storage body 19.

[0027] Furthermore, an engine outlet water temperature sensor 18 is connected in series at the engine outlet water end 15.

[0028] Furthermore, the battery heating plate heat exchanger 5 is connected to one port of the three-way flow regulating valve 17, and the other two ports of the three-way flow regulating valve 17 are connected to the heater core 14 and the engine water outlet 15, respectively.

[0029] Furthermore, the HVAC system includes an HVAC unit 20, and a cold air core 9 and a warm air core 14 located within the HVAC unit 20; wherein, an external heat exchanger 12 is connected to the cold air core 9, and the other end of the cold air core 9 returns to the compressor 11 via a gas-liquid separator 10. The HVAC unit 20 can be located in areas requiring temperature regulation, such as the driver's cab. More preferably, a return air temperature sensor 26 is installed at the cold air core 9, and an ambient temperature sensor 27 is installed at the external heat exchanger 12.

[0030] Further, the outlet of the heat exchanger 12 outside the vehicle is divided into two paths, one of which is connected to the battery cooling plate heat exchanger 4 through the electronic expansion valve 13, and the other of which is connected to the cold air core 9 through the thermal expansion valve 7. Preferably, the blower 8 is arranged on the cold air core 9. In addition, the electromagnetic valve 6 is arranged at the front end of the thermal expansion valve 7.

[0031] Further, the refrigeration and heating pipeline of the battery 2 comprises the battery 2, the battery cooling plate heat exchanger 4, the battery heating plate heat exchanger 5, the expansion tank 1 and the circulating water pump 3 connected in series, and the expansion tank 1 is used to maintain the water volume and pressure of the battery water pipeline system when the ambient temperature changes. Preferably, the water level switch 25 is arranged at the water inlet side of the expansion tank 1.

[0032] It should be noted that the battery heating plate heat exchanger 5 is provided with a battery liquid cooling circuit inlet 21 and a battery liquid cooling circuit outlet 22, and the battery liquid cooling outlet temperature sensor 23 and the battery liquid cooling return water temperature sensor 24 are further arranged in series in the refrigeration and heating pipeline.

[0033] The working principle of the utility model is:

[0034] When the cab has heating demand or the battery has heating demand, the flow of the engine to the battery heating plate heat exchanger 5 and the warm air core 14 can be realized through the three-way flow regulating valve 17, and the adjustment of the heating and temperature management ability and temperature of the cab and the battery is realized. The battery heating plate heat exchanger 5 is a two-channel water-water heat exchanger, one flow path is connected to the electric energy storage body 19, and the other flow path is connected in series or parallel to the refrigeration and heating pipeline of the battery 2, and the purpose of heating the battery by the engine is realized through the circulation of the refrigeration and heating pipeline of the battery 2. After being collected by the battery heating plate heat exchanger 5 and the warm air core 14, the water finally returns to the engine circuit inlet.

[0035] When the battery or the cab has heating demand, the engine outlet water temperature sensor 18 detects the engine outlet water temperature, and when the engine outlet water temperature is lower than the set value one, the electric energy storage body 19 is started to release heat, so as to realize heating of the battery, the cab and the engine.

[0036] When the engine outlet water temperature sensor 18 detects that the engine outlet water temperature is greater than the set value two, the electric energy storage body 19 is closed to release heat, and the battery and the cab are heated by the waste heat of the engine.

[0037] When the battery side does not need to be heated, the three-way flow regulating valve 17 is closed to close the flow of the battery heating circuit, so as to realize the function of closing the battery heating. Similarly, when the temperature entering the battery reaches the upper limit of the allowable temperature, the water flow entering the battery heating plate heat exchanger 5 can be adjusted through the three-way flow regulating valve 17, so as to realize the purpose of adjusting and controlling the water temperature entering the battery.

[0038] The electric energy storage body 19 can be supplied with power synchronously when charging the vehicle with a gun, so as to realize the energy storage purpose, and when heat release is needed, the heat release function can be realized through a switch.

[0039] Therefore, the battery, the cab and the engine can be heated under low temperature conditions by using the electric energy storage body 19, and the flow and temperature control of the battery heating chiller and the cab heating core body can be realized by using the three-way flow regulating valve 17.

[0040] The preferred embodiments of the utility model are described above, and it should be noted that, for those skilled in the art, without departing from the overall concept of the utility model, some changes and improvements can be made, and these should also be regarded as the protection range of the utility model.

Claims

1. A heating thermal management system for a plug-in hybrid vehicle, characterized in that: Includes a compressor (11), the high temperature and high pressure refrigerant outlet of the compressor (11) is connected to an external heat exchanger (12), the outlet of the external heat exchanger (12) is divided into two paths, which are connected to the battery cooling plate heat exchanger (4) and HVAC respectively; the other end of the HVAC returns to the compressor (11) through a gas-liquid separator (10). The battery cooling plate heat exchanger (4) is connected in series in the cooling and heating pipeline of the battery (2). The cooling and heating pipeline also includes a battery heating plate heat exchanger (5) connected in series with the battery cooling plate heat exchanger (4). The two ends of the battery heating plate heat exchanger (5) are respectively connected to the engine water outlet (15) and the engine water return (16). At the same time, the heater core (14) in the HVAC is also connected to the engine water outlet (15) and the engine water return (16).

2. The heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: After the battery heating plate heat exchanger (5) and the warm air core (14) are connected in parallel, the electric energy storage body (19) is connected in series.

3. The heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: An engine outlet water temperature sensor (18) is connected in series at the engine outlet water end (15).

4. The heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: The battery heating plate heat exchanger (5) is connected to one port of the three-way flow regulating valve (17), and the other two ports of the three-way flow regulating valve (17) are connected to the heater core (14) and the engine water outlet (15), respectively.

5. The heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: HVAC includes an HVAC air conditioning unit (20), and a cold air core (9) and a warm air core (14) located inside the HVAC air conditioning unit (20); wherein, an external heat exchanger (12) is connected to the cold air core (9), and the other end of the cold air core (9) returns to the compressor (11) through a gas-liquid separator (10).

6. The heating thermal management system for a plug-in hybrid vehicle according to claim 5, characterized in that: A return air temperature sensor (26) is installed at the cold air core (9), and an ambient temperature sensor (27) is installed at the external heat exchanger (12).

7. A heating thermal management system for a plug-in hybrid vehicle according to claim 5, characterized in that: The outlet of the external heat exchanger (12) is divided into two paths. One path is connected to the battery cooling plate heat exchanger (4) through the electronic expansion valve (13), and the other path is connected to the cold air core (9) through the thermal expansion valve (7).

8. The heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: The cooling and heating pipeline of the battery (2) includes the battery (2), battery cooling plate heat exchanger (4), battery heating plate heat exchanger (5), expansion tank (1) and circulating water pump (3) connected in series.

9. A heating thermal management system for a plug-in hybrid vehicle according to claim 1, characterized in that: The battery heating plate heat exchanger (5) is provided with a battery liquid cooling circuit inlet (21) and a battery liquid cooling circuit outlet (22), and a battery liquid cooling outlet water temperature sensor (23) and a battery liquid cooling return water temperature sensor (24) are also connected in series in the cooling and heating pipeline.

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