阅读说明：本技术 一种新能源汽车热管理系统 (New energy automobile thermal management system ) 是由 刘子萌 刘劲松 张栋杰 李强 于 2020-03-31 设计创作，主要内容包括：本发明公开了一种新能源汽车热管理系统,包括:电机回路和暖风芯体；所述电机回路包括依次通过冷却液管路串联的第一膨胀水壶、第一水泵、充电器、电机和混水设备；所述暖风芯体通过所述冷却液管路与所述混水设备并联。本发明所涉及新能源汽车热管理系统的原理图清晰不复杂,使用的零部件少,成本低,同时拥有乘员舱热泵空调系统制冷和制热,电池冷却和加热,电机冷却和热回收,外部蒸发器化霜除冰等功能。并且能源利用率高,更安全等特点。(The invention discloses a new energy automobile heat management system, which comprises a motor loop and a warm air core body; the motor loop comprises a first expansion kettle, a first water pump, a charger, a motor and water mixing equipment which are sequentially connected in series through a cooling liquid pipeline; the warm air core body is connected with the water mixing device in parallel through the cooling liquid pipeline. The heat management system of the new energy automobile has clear and uncomplicated schematic diagram, uses few parts and low cost, and has the functions of refrigerating and heating of a heat pump air conditioning system of a passenger compartment, cooling and heating of a battery, cooling and heat recovery of a motor, defrosting and deicing of an external evaporator and the like. And the energy utilization rate is high, and the safety is higher.)

1. The thermal management system of the new energy automobile is characterized by comprising a motor loop and a warm air core body (30);

the motor loop comprises a first expansion kettle (1), a first water pump (2), a charger (3), a motor (4) and a water mixing device (5) which are connected in series through a cooling liquid pipeline in sequence;

the warm air core body (30) is connected with the water mixing device (5) in parallel through the cooling liquid pipeline.

2. The system of claim 1, wherein the motor circuit further comprises: a first three-way valve (6), the first three-way valve (6) comprising: the water mixing device comprises a first inlet end, a second inlet end and an outlet end, wherein the first inlet end and the second inlet end are respectively connected with two ends of the water mixing device (5) on the motor loop, and the outlet end is connected with the first expansion kettle (1).

3. The system of claim 1, further comprising: the second water pump (7), the heater (8) and the second three-way valve (9) are connected in sequence through the cooling liquid pipeline;

the first outlet end of the second three-way valve (9) is connected with one end of the warm air core body (30), the other end of the warm air core body (30) is respectively connected with the outlet end of the water mixing device (5) and the inlet end of the second water pump (7), and the second outlet end of the second three-way valve (9) is connected with the water mixing device (5).

4. The system of claim 1, further comprising: a battery circuit and a first one-way valve (15);

the battery loop comprises a third three-way valve (10), a second expansion kettle (11), a third water pump (12), a battery pack (13) and a cooler (14) which are connected in series through a cooling liquid pipeline in sequence;

the water inlet end of the first one-way valve (15) is connected with the cooler (14) and one inlet end of the third three-way valve (10), and the other end of the first one-way valve (15) is connected with the inlet end of the water mixing device (5); the outlet end of the water mixing device (5) is connected with the other inlet end of the third three-way valve (10).

5. The system of claim 2, further comprising: a low temperature radiator (16);

the motor loop further comprises a fourth three-way valve (17), the inlet end of the fourth three-way valve (17) is connected with one end of the motor (4), the first outlet end of the fourth three-way valve (17) is connected with the inlet end of the water mixing device (5), the second outlet end of the fourth three-way valve (17) is connected with one end of the low-temperature radiator (16), and the other end of the low-temperature radiator (16) is connected with the inlet end of the water mixing device (5).

6. The system of claim 5, further comprising: an air conditioning circuit;

the air conditioning loop comprises a liquid-gas separator (18), a compressor (19), an internal condenser (20), a normally open electromagnetic valve (21), an external heat exchanger (22), a second one-way valve (23), a first electronic expansion valve (24) and an evaporator (25) which are sequentially connected in series.

7. The system of claim 6, wherein the air conditioning circuit further comprises: one end of the second electronic expansion valve (26) is connected with an outlet of the second one-way valve (23), the other end of the second electronic expansion valve (26) is connected with an inlet of the cooler (14), and an outlet of the cooler (14) is connected with the liquid-gas separator (18).

8. The system of claim 7, wherein the air conditioning circuit further comprises: a third electronic expansion valve (27) and a first normally closed solenoid valve (28), wherein the third electronic expansion valve (27) is connected with the normally open solenoid valve (21) in parallel; one end of the first normally closed solenoid valve (28) is connected between the evaporator (25) and the normally open solenoid valve (21), and the other end of the first normally closed solenoid valve (28) is connected with one end of the second electronic expansion valve (26).

9. The system of claim 8, wherein the air conditioning circuit further comprises: one end of the second normally closed electromagnetic valve (29) is connected with the external heat exchanger (22), and the other end of the second normally closed electromagnetic valve (29) is connected with the liquid-gas separator (18).

10. A system according to claim 9, characterized in that the first three-way valve (6), the second three-way valve (9), the third three-way valve (10), the fourth three-way valve (17), the first non-return valve (15) and the second non-return valve (23) are all adjustable flow control valves.

Technical Field

The invention relates to the technical field of new energy automobile heat management systems, in particular to a new energy automobile heat management system.

Background

Due to the promotion of national strategy, new energy vehicles, especially pure electric vehicles, develop at a high speed in recent years, and various traditional vehicle enterprises and novel vehicle enterprises join in competition ranks.

However, when the passenger compartment needs to be heated in winter in the existing vehicle, the passenger compartment can only be heated by using the heater (PTC), the system efficiency can be greatly reduced, the energy consumption of the whole vehicle can be increased, and the driving mileage can be greatly reduced.

However, for the development of the heat management system of a pure electric vehicle, most vehicle types only start from meeting the requirements, but do not well enough for the waste heat utilization and energy management of the whole vehicle. The thermal management system of the new energy automobile generally comprises heating components such as a power battery, a direct current-to-direct current converter (DCDC), a driving motor, a motor controller and the like, wherein the highest cooling liquid temperature of the components such as the driving motor, the motor controller and the like is below 65 ℃, and the optimal working temperature of the power battery is 25-45 ℃, so that the thermal management system needs to meet the cooling or heating requirements of the components, and on the basis, if the waste heat of the system can be effectively utilized, the power consumption of the system can be greatly reduced.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a new energy automobile heat management system, which comprises a motor loop and a warm air core body;

the motor loop comprises a first expansion kettle, a first water pump, a charger, a motor and water mixing equipment which are sequentially connected in series through a cooling liquid pipeline;

the warm air core body is connected with the water mixing device in parallel through the cooling liquid pipeline.

Further, the motor circuit further includes: a first three-way valve, the first three-way valve comprising: the water mixing device comprises a first inlet end, a second inlet end and an outlet end, wherein the first inlet end and the second inlet end are respectively connected with two ends of the water mixing device on the motor loop, and the outlet end is connected with the first expansion kettle.

Further, still include: the second water pump, the heater and the second three-way valve are connected in sequence through the cooling liquid pipeline;

the first outlet end of the second three-way valve is connected with one end of the warm air core body, the other end of the warm air core body is respectively connected with the outlet end of the water mixing device and the inlet end of the second water pump, and the second outlet end of the second three-way valve is connected with the water mixing device.

Further, still include: a battery circuit and a first one-way valve;

the battery loop comprises a third three-way valve, a second expansion kettle, a third water pump, a battery pack and a cooler which are sequentially connected in series through a cooling liquid pipeline;

the water inlet end of the first one-way valve is connected with the cooler and one inlet end of the third three-way valve, and the other end of the first one-way valve is connected with the inlet end of the water mixing device; and the outlet end of the water mixing device is connected with the other inlet end of the third three-way valve.

Further, still include: a low temperature heat sink;

the motor loop further comprises a fourth three-way valve, the inlet end of the fourth three-way valve is connected with one end of the motor, the first outlet end of the fourth three-way valve is connected with the inlet end of the water mixing device, the second outlet end of the fourth three-way valve is connected with one end of the low-temperature radiator, and the other end of the low-temperature radiator is connected with the inlet end of the water mixing device.

Further, still include: an air conditioning circuit;

the air conditioning loop comprises a liquid-gas separator, a compressor, an internal condenser, a normally open solenoid valve, an external heat exchanger, a second one-way valve, a first electronic expansion valve and an evaporator which are sequentially connected in series.

Further, the air conditioning circuit further includes: one end of the second electronic expansion valve is connected with the outlet of the second one-way valve, the other end of the second electronic expansion valve is connected with the inlet of the cooler, and the outlet of the cooler is connected with the liquid-gas separator.

Further, the air conditioning circuit further includes: the third electronic expansion valve is connected with the normally open electromagnetic valve in parallel; one end of the first normally closed solenoid valve is connected between the evaporator and the normally open solenoid valve, and the other end of the first normally closed solenoid valve is connected with one end of the second electronic expansion valve.

Further, the air conditioning circuit further includes: and one end of the second normally closed electromagnetic valve is connected with the external heat exchanger, and the other end of the second normally closed electromagnetic valve is connected with the liquid-gas separator.

Furthermore, the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve, the first one-way valve and the second one-way valve are all adjustable flow control valves.

The implementation of the invention has the following beneficial effects:

the heat management system of the new energy automobile has clear and uncomplicated schematic diagram, uses few parts and low cost, and has the functions of refrigerating and heating of a heat pump air conditioning system of a passenger compartment, cooling and heating of a battery, cooling and heat recovery of a motor, defrosting and deicing of an external evaporator and the like. And can improve the energy utilization rate and the safety factor, etc.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a thermal management system of a new energy vehicle according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another new energy vehicle thermal management system provided in the embodiment of the present invention;

fig. 3 is a schematic structural diagram of another new energy vehicle thermal management system provided in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a thermal management system of a new energy vehicle according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a thermal management system of a new energy vehicle according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a thermal management system of yet another new energy vehicle according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a passenger compartment refrigeration circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a structure of an air conditioning circuit for cooling a battery according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of an air conditioning circuit for simultaneously cooling a battery and a passenger compartment according to an embodiment of the present invention;

fig. 10 is a schematic structural view of the passenger compartment in which conventional heating and chiller heat recovery heating are simultaneously operated;

fig. 11 is a schematic structural diagram of defrosting and deicing of an external evaporator.

The water heater comprises a water tank, a water pump, a charger, a motor, a water mixing device and a warm air core body, wherein the water tank comprises 1-a first expansion water kettle, 2-a first water pump, 3-a charger, 4-a motor, 5-a water mixing device and 30-a warm air core body; 6-a first three-way valve, 7-a second water pump, 8-a heater, 9-a second three-way valve, 10-a third three-way valve, 11-a second expansion kettle, 12-a third water pump, 13-a battery pack, 14-a cooler, 15-a first one-way valve, 16-a low-temperature radiator, 17-a fourth three-way valve, 18-a liquid-gas separator, 19-a compressor, 20-an internal condenser, 21-a normally open solenoid valve, 22-an external heat exchanger, 23-a second one-way valve, 24-a first electronic expansion valve, 25-an evaporator, 26-a second electronic expansion valve, 27-a third electronic expansion valve, 28-a first normally closed solenoid valve and 29-a second normally closed solenoid valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

It should be noted that when an element is referred to as being "connected" to another element, it can be either a circuit connection or a communication connection.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Fig. 1 is a schematic structural diagram of a thermal management system of a new energy vehicle according to an embodiment of the present invention, and as shown in fig. 1, the present invention provides a thermal management system of a new energy vehicle, including a motor circuit and a warm air core 30;

the motor loop comprises a first expansion kettle 1, a first water pump 2, a charger 3, a motor 4 and a water mixing device 5 which are connected in series through a cooling liquid pipeline in sequence;

the warm air core 30 is connected in parallel with the water mixing device 5 through the cooling liquid pipeline.

Specifically, the first expansion water bottle 1 is used for when the engine operates, coolant liquid can be in the motor loop and incessantly circulate, can flow through first expansion water bottle 1 midway, if the pressure is too high, or the coolant liquid is excessive, unnecessary gas and coolant liquid will flow out from the bypass water course of first expansion water bottle 1, avoid cooling system pressure too high, cause the bad consequence of violence pipe. The first water pump 2 is used for driving the directional flow of the cooling liquid in the cooling liquid pipeline. The charger 3 is used to provide voltage or current conversion for the motor 4. The motor 4 is used to drive the vehicle. The water mixing device 5(HUB) is used to mix the coolant in the motor circuit and the coolant circuit through the warm-dispensing core, the HUB: the effect is that the coolant that gets into the HUB with the battery return circuit coolant that gets into the HUB mixes, and the higher temperature motor 4 coolant mixes with the lower battery coolant of temperature continuously like this.

It should be noted that the charger 3, the motor 4, and the warm air core 30 are not directly connected to the coolant pipeline, but are all parts that can be heated or cooled by the coolant pipeline. It is to be understood that the cooling liquid is not particularly limited in the embodiments of the present specification, and may be set according to the actual situation. In some possible embodiments, the electric machine 4 may comprise a front electric machine 4 and a rear electric machine 4, the front electric machine 4 being used to drive the front wheels of the vehicle and the rear electric machine 4 being used to drive the rear wheels of the vehicle.

Specifically, the low-temperature radiator 16 mainly functions to cool down the motor circuit or the battery circuit.

The internal condenser 20 is passed through both the cooling and heating modes.

The outside heat exchanger 22 is used as a condenser in cooling and as an evaporator 25 in heating.

The evaporator 25 is opened when the passenger compartment has a refrigeration demand, and mainly plays a role in refrigeration and dehumidification.

A Chiller: the heat exchanger is used for heat exchange between the cooling liquid and the refrigerant by passing the refrigerant through one side and the cooling liquid through the other side, and mainly aims at cooling the cooling liquid or recovering heat in the cooling liquid.

The liquid-gas separator 18(ACCU) mainly functions to absorb the liquid refrigerant in the pipeline, ensure that the refrigerant entering the compressor 19 is gaseous refrigerant, and prevent the compressor 19 from liquid impact.

Heater 8 (HVH): liquid heating (PTC) is used, which mainly serves to provide a heat source for the passenger compartment or the battery during winter.

The embodiment of the specification provides a new energy automobile thermal management system, can realize utilizing the heat that motor 4 produced to heat passenger cabin when motor 4 generates heat, has avoided thermal loss, has improved the availability factor of the energy, has reduced the loss of whole car energy, improves new energy automobile's driving mileage simultaneously to the system structure that this application provided is clear, with low costs, safer.

On the basis of the above embodiments, in an embodiment of this specification, fig. 2 is a schematic structural diagram of another new energy vehicle thermal management system provided in the embodiment of the present invention; as shown in fig. 2, the motor circuit further includes: a first three-way valve 6, the first three-way valve 6 comprising: the water mixing device comprises a first inlet end, a second inlet end and an outlet end, wherein the first inlet end and the second inlet end are respectively connected with two ends of the water mixing device 5 on the motor loop, and the outlet end is connected with the first expansion kettle 1.

Specifically, a first three-way valve 6 may be further disposed in the motor loop, the first three-way valve 6 may be provided with two inlet ends and an outlet end, the first inlet end and the second inlet end may be respectively connected to two ends of the water mixing device 5 on the motor loop, and the outlet end is connected to the first expansion kettle 1.

Exemplarily, when the passenger compartment does not need to be heated by heat energy generated by the motor 4, the first three-way valve 6 may be controlled to close the first inlet port and open the second inlet port, so that the cooling liquid does not flow through the water mixing device 5, and the self-circulation of the motor loop is realized, thereby achieving the function of cooling the motor 4. Under the condition, the motor loop is in a self-heat-insulation state, the heat of the motor loop cannot be recycled, and the cooling liquid of the motor loop does not need to be cooled through a radiator.

When the passenger compartment has a small amount of heating requirements, the heating requirement of the passenger compartment can be met only by heating the warm air core body 30 by using the heat of the motor loop without starting a heat pump for heating.

When the passenger compartment has no heating requirement, but the temperature setting of the front and the secondary drives is different, the heat of the motor 4 is required to be used for heating the warm air core body 30 at this time, and the temperature of cold air passing through the warm air core body 30 is adjusted by adjusting the position of the temperature air door, so that the adjusting effect of different temperature areas is realized, and meanwhile, the motor loop can also be cooled.

On the basis of the above embodiments, in an embodiment of this specification, as shown in fig. 3, fig. 3 is a schematic structural diagram of a thermal management system of another new energy vehicle according to an embodiment of the present invention, further including: the second water pump 7, the heater 8 and the second three-way valve 9 are connected in sequence through the cooling liquid pipeline;

a first outlet end of the second three-way valve 9 is connected with one end of the warm air core body 30, the other end of the warm air core body 30 is respectively connected with an outlet end of the water mixing device 5 and an inlet end of the second water pump 7, and a second outlet end of the second three-way valve 9 is connected with the water mixing device 5.

For example, when the passenger compartment needs to be heated by the heater 8 alone, the second three-way valve 9 may be controlled such that the second water pump 7, the heater 8, the second three-way valve 9, and the warm air core 30 constitute a single heat circulation loop.

Exemplarily, when the motor 4 needs the heater 8 to heat alone, the first three-way valve 6 and the second three-way valve 9 may be controlled, so that the second water pump 7, the heater 8, the second three-way valve 9, the water mixing device 5, the first three-way valve 6, the first expansion water tank 1, the first water pump 2, the charger 3, the motor 4, the water mixing device 5, and the second water pump 7 form an individual heat circulation loop to heat the motor 4 by the heater 8.

On the basis of the above embodiments, in an embodiment of this specification, as shown in fig. 4, fig. 4 is a schematic structural diagram of a further new energy vehicle thermal management system provided by the embodiment of the present invention, further including: a battery circuit and a first check valve 15;

the battery loop comprises a third three-way valve 10, a second expansion kettle 11, a third water pump 12, a battery pack 13 and a cooler 14 which are connected in series through a cooling liquid pipeline in sequence;

the water inlet end of the first one-way valve 15 is connected with the cooler 14 and one inlet end of the third three-way valve 10, and the other end of the first one-way valve 15 is connected with the inlet end of the water mixing device 5; the outlet end of the water mixing device 5 is connected to the other inlet end of the third three-way valve 10.

Specifically, the battery pack 13 is used for providing electric power for the new energy automobile, the battery pack 13 may be provided with a plurality of battery packs, the battery pack 13 and the second water pump 7 are connected by a cooling liquid pipeline, and the cooling liquid pipeline is connected with the cooling fins of the battery pack 13 so as to heat or cool the battery pack 13. The third three-way valve 10 is a two-in one-out type three-way valve. The cooler 14 may be a heat exchanger or a chiller.

For example, the battery circuit may be self-cycling when the battery pack 13 needs to maintain a constant temperature.

When the battery pack 13 needs to be heated, there are at least two ways to heat up, one of which is: the heater 8 heats the battery pack 13, a heating loop is formed by the second water pump 7, the heater 8, the second three-way valve 9 and the water mixing device 5, and then the cooling liquid in the water mixing device 5 is heated, and the battery loop is connected with the heating loop in parallel, so that the heater 8 can heat the battery pack 13; the second step is as follows: the battery pack 13 is heated by heat generated by the motor 4, the motor loop is connected with the battery loop in parallel through the water mixing device 5, and the heat generated by the motor 4 is transmitted to the battery pack 13 through cooling liquid, so that the battery pack 13 is heated.

When the battery pack 13 needs to be cooled, there are at least two ways to cool, one of which is: when the heater 8 does not work, the heating loop can enlarge the cooling liquid capacity of the battery loop and increase the cooling efficiency of the battery pack 13; the second step is as follows: when the heat that motor 4 produced is less than group battery 13 heat, the motor return circuit passes through mixing water equipment 5 with the battery return circuit and connects in parallel, and the heat that group battery 13 produced can be passed through mixing water equipment 5 and is given the motor return circuit, increase group battery 13 cooling efficiency.

It will be appreciated that the heat of the battery or motor 4 may also be cooled or recovered by the cooler 14. The temperature of the battery loop is high, the compressor 19 needs to be started, heat is absorbed from the battery loop through the beller, and the purpose of reducing the temperature of the battery loop is achieved, and at the moment, the passenger compartment may or may not have a refrigeration requirement.

When the temperature of the battery loop is higher than 10 ℃ relative to the ambient temperature, the passenger compartment can be heated by recovering the heat of the battery, and the passenger compartment has a heating requirement.

On the basis of the above embodiments, in an embodiment of the present specification, as shown in fig. 5, fig. 5 is a schematic structural diagram of a thermal management system of a new energy vehicle according to an embodiment of the present invention; further comprising: a low temperature heat sink 16;

the motor loop further comprises a fourth three-way valve 17, an inlet end of the fourth three-way valve 17 is connected with one end of the motor 4, a first outlet end of the fourth three-way valve 17 is connected with an inlet end of the water mixing device 5, a second outlet end of the fourth three-way valve 17 is connected with one end of the low-temperature radiator 16, and the other end of the low-temperature radiator 16 is connected with an inlet end of the water mixing device 5.

Specifically, the first expansion kettle 1 can be provided with a water guide pipe, the water guide pipe is connected with the first expansion kettle 1 and the low-temperature radiator 16, when the pressure of the first expansion kettle 1 is too large, the water guide pipe can keep the pressure balance of the first expansion, and danger caused by the too large pressure is avoided.

For example, when the motor 4 needs to be cooled, the cooling may be performed by the low-temperature radiator 16, and the specific cooling circuit may be: the device comprises a first expansion kettle 1, a first water pump 2, a charger 3, a motor 4, a fourth three-way valve 17, a low-temperature radiator 16, a first three-way valve 6 and the first expansion kettle 1.

When both the motor 4 and the battery need to be cooled, they can be cooled simultaneously by the low-temperature radiator 16, and the specific cooling loop may be: the water mixing device comprises a first expansion kettle 1, a first water pump 2, a charger 3, a motor 4, a low-temperature radiator 16, a water mixing device 5, a third three-way valve 10, a second expansion kettle 11, a second water pump 7, a battery pack 13, a cooler 14, a first one-way valve 15, the water mixing device 5, a first three-way valve 6 and the first expansion kettle 1. If the temperature of the motor loop is high at this time, the loop cannot be opened, because the temperature of the battery loop is increased due to the hot water in the motor loop, which may cause irreversible damage to the battery.

When both the motor 4 and the battery need to be cooled, they can be cooled simultaneously by the cooler 14, and the specific cooling loop can be: the water mixing device comprises a first expansion kettle 1, a first water pump 2, a charger 3, a motor 4, a water mixing device 5, a third three-way valve 10, a second expansion kettle 11, a second water pump 7, a battery pack 13, a cooler 14, a first one-way valve 15, a water mixing device 5, a first three-way valve 6 and the first expansion kettle 1. If the temperature of the motor loop is high at this time, the loop cannot be opened, because the temperature of the battery loop is increased due to the hot water in the motor loop, which may cause irreversible damage to the battery.

When the motor 4 and the battery are connected in series with the cooler 14 for heat recovery, the environment temperature is generally lower in the case, the heat recovered by the heat recovery is mainly used for heating the heat pump of the passenger compartment, and the water pump can absorb heat from the motor 4 and the battery through the chiller.

On the basis of the above embodiments, in an embodiment of this specification, as shown in fig. 6, fig. 6 is a schematic structural diagram of a thermal management system of yet another new energy vehicle according to an embodiment of the present invention, further including: an air conditioning circuit;

the air conditioning loop comprises a liquid-gas separator 18, a compressor 19, an internal condenser 20, a normally open electromagnetic valve 21, an external heat exchanger 22, a second one-way valve 23, a first electronic expansion valve 24 and an evaporator 25 which are sequentially connected in series.

On the basis of the above embodiments, in an embodiment of the present specification, the air conditioning circuit further includes: and one end of the second electronic expansion valve 26 is connected with the outlet of the second one-way valve 23, the other end of the second electronic expansion valve 26 is connected with the inlet of the cooler 14, and the outlet of the cooler 14 is connected with the liquid-gas separator 18.

On the basis of the above embodiments, in an embodiment of the present specification, the air conditioning circuit further includes: a third electronic expansion valve 27 and a first normally closed solenoid valve 28, wherein the third electronic expansion valve 27 is connected with the normally open solenoid valve 21 in parallel; one end of the first normally closed solenoid valve 28 is connected between the evaporator 25 and the normally open solenoid valve 21, and the other end of the first normally closed solenoid valve 28 is connected with one end of the second electronic expansion valve 26.

On the basis of the above embodiments, in an embodiment of the present specification, the air conditioning circuit further includes: and one end of the second normally closed electromagnetic valve 29 is connected with the external heat exchanger 22, and the other end of the second normally closed electromagnetic valve 29 is connected with the liquid-gas separator 18.

Fig. 7 is a schematic structural diagram of a passenger compartment refrigeration circuit according to an embodiment of the present invention; when the passenger compartment is refrigerated, the compressor 19 is turned on to refrigerate via the evaporator 25.

Exemplarily, as shown in fig. 8, fig. 8 is a schematic structural diagram of an air conditioning circuit for cooling a battery according to an embodiment of the present invention; when the battery needs to be cooled down quickly, the refrigeration circuit of fig. 8 is turned on, at which time the evaporator 25 is not operating, i.e. the passenger compartment has no refrigeration request.

Exemplarily, as shown in fig. 9, fig. 9 is a schematic structural diagram of an air conditioning circuit for cooling a battery and a passenger compartment simultaneously, where the passenger compartment is cooled and the battery is cooled, and in this case, the passenger compartment has a cooling requirement and the battery also has a cooling requirement, and therefore, the air conditioning circuit is turned on simultaneously to meet the cooling requirements of the passenger compartment and the battery.

In some possible embodiments, the air conditioning circuit can also provide conventional heating of the passenger compartment by releasing heat from the internal condenser 20 and absorbing heat from the environment by the external evaporator 25.

In some possible embodiments, the teller may also perform heat recovery on the passenger compartment, and the specific loop may be: liquid-gas separator 18, compressor 19, internal condenser 20, third electronic expansion valve 27, cooler 14, liquid-gas separator 18.

In some possible embodiments, as shown in fig. 10, fig. 10 is a schematic structural diagram of the passenger compartment normal heating and the chiller heat recovery heating which operate simultaneously, in which case the external evaporator 25 and the chiller evaporator 25 are turned on to absorb heat and the internal condenser 20 releases heat, so as to achieve the purpose of heating the passenger compartment.

In some possible embodiments, as shown in fig. 11, fig. 11 is a schematic structural diagram of defrosting and deicing of external evaporator 25, and external evaporator 25 is defrosting and deicing, which can be divided into two cases:

1) after a vehicle is parked in an open environment for a period of time, because of weather, a thicker ice layer exists on the vehicle, at this time, the surfaces of the external evaporator 25 and the radiator also have the ice layer, at this time, the heating of the conventional heat pump cannot be started, because the external evaporator 25 is covered by the ice layer, air cannot exchange heat through the ice layer, therefore, the deicing is carried out firstly, the principle of the deicing is that the external evaporator 25 is used as a condenser, the condenser emits heat to the ice layer on the surface, at this time, the condenser is used as the evaporator 25 to absorb heat from a cooling loop to absorb heat of the motor 4 or heat of a battery, or simultaneously absorb heat of the battery of the motor 4, the ice layer melts slowly, after the deicing is completed, the conventional heat pump can be started to heat through the internal condenser 20, the external evaporator 25 absorbs heat from ambient air, and if the deicing function is not available, the vehicle cannot start the heat pump to heat the passenger compartment, only PTC can be turned on, resulting in increased energy consumption.

2) The vehicle is at the in-process of traveling, under the environment about 2 ℃ of low temperature in winter, when external humidity is great, the surface can slowly frost behind the evaporimeter 25 operation a period, evaporimeter 25 frosts to certain extent can influence the heat absorption of evaporimeter 25 to lead to compressor 19 suction pressure to hang down excessively, trigger compressor 19 low pressure protection and shut down, passenger cabin heats and can only open PTC after stopping and heat passenger cabin, and the energy consumption can increase this moment, and the continuation of the journey mileage can reduce. At the moment, the operation mode is switched to the defrosting and deicing mode, frost can be removed in a short time, and the operation mode is switched to the conventional heat pump mode for heating after the frost is removed, so that PTC heating is not required to be started, the heating requirement of the passenger compartment is met, and meanwhile, the energy consumption is lower.

On the basis of the above embodiments, in one embodiment of the present disclosure, the first three-way valve 6, the second three-way valve 9, the third three-way valve 10, the fourth three-way valve 17, the first one-way valve 15, the normally open solenoid valve 21, the second one-way valve 23, the first electronic expansion valve 24, the second electronic expansion valve 26, the third electronic expansion valve 27, the first normally closed solenoid valve 28, and the second normally closed solenoid valve 29 are all adjustable flow control valves.

In another case, the external evaporator 25 is frozen, the heat pump absorbs heat from the motor 4 and the battery through the chiller, and the external evaporator 25 performs deicing. The external evaporator 25 corresponds to an outer condenser in the figure, and can be used for both heating and cooling the system by using the evaporator 25 and the condenser.

The invention relates to a thermal management system of a new energy automobile, which can be used in a PMA platform project or other platforms of electric vehicle heat distribution pump systems.

The heat management system of the new energy automobile has the innovation points that a schematic diagram is clear and uncomplicated, the used parts are few, the cost is low, and the heat management system has the functions of refrigerating and heating of the heat pump air-conditioning system of the passenger compartment, cooling and heating of a battery, cooling and heat recovery of the motor 4, defrosting and deicing of the external evaporator 25 and the like.

And the coolant loop that the invention provides has at least three, it is the electrical machinery loop separately, battery loop and warm braw loop, every loop can operate alone and is not interfered by other loop, every two loops can mix alone and is not influenced by another loop too, when the electrical machinery loop three-way valve or battery loop three-way valve is invalid, can pass the three-way valve of the control battery loop or electrical machinery loop, and achieve the purpose that the hot water of the electrical machinery 4 can't enter the battery loop. The only failure condition is that the three-way valve of the motor circuit and the three-way valve of the battery circuit fail simultaneously. If the failure rate of the three-way valve is 1%, the probability of two three-way valves failing simultaneously becomes one in ten thousandth.

The functional safety is a very important problem of a pure electric vehicle, mainly considering that hot water with higher temperature in a motor loop can not enter a battery, and the functional safety is divided into the following aspects:

1. because the battery has the requirement of the temperature of the inlet water, the motor 4 can be triggered to reduce the power after the temperature of the inlet water exceeds 45 ℃, and the satisfaction degree of passengers can be reduced.

2. After the temperature of the inlet water exceeds 50 ℃, the power of the motor 4 can be triggered to be cut off, so that the power of the vehicle is lost, and if the condition that the power of the vehicle is lost occurs during high-speed traveling, the safety risk is very high.

3. After the temperature of the inlet water exceeds 50 ℃, if the power of the motor 4 is not cut off, the temperature of the battery loop can be continuously increased due to the continuous running of the vehicle, and the risk of burning and even explosion due to the overhigh temperature of the battery can be caused.

Considering that the parts cannot be made one hundred percent non-failure, in order to meet the requirement of functional safety, when the first three-way valve 6 of the motor loop is damaged at the position of entering the HUB, the third three-way valve 10 of the battery loop can be adjusted to the position of small circulation, so that the hot water in the motor 4 can be prevented from entering the battery. Unless the third three-way valve 10 of the battery circuit is also damaged, hot water from the motor 4 will not enter the battery.

If the probability of one water valve being damaged is one percent, the probability of two water valves being damaged simultaneously is one ten thousandth.

Therefore, the new energy automobile heat pipeline system provided by the application equivalently reduces the risk of battery thermal runaway by 100 times, and improves the safety of vehicles.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.