CN111976414A - Control method and system of thermal management system - Google Patents
Control method and system of thermal management system Download PDFInfo
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- CN111976414A CN111976414A CN201910425645.2A CN201910425645A CN111976414A CN 111976414 A CN111976414 A CN 111976414A CN 201910425645 A CN201910425645 A CN 201910425645A CN 111976414 A CN111976414 A CN 111976414A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00007—Combined heating, ventilating, or cooling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00321—Heat exchangers for air-conditioning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The embodiment of the application discloses a control method and a control system of a thermal management system, when indoor heating is needed, whether heat storage of a power battery can be utilized or not is judged at first, and when heat storage of the power battery can be utilized, a refrigerant absorbs heat through a first heating loop, a second heating loop and a third heating loop and enters a condenser through the driving of a compressor to release the heat to the indoor space, so that heating is achieved. Therefore, when the temperature is lower, the temperature and the pressure of the refrigerant can be improved by utilizing the heat storage of the power battery, so that the heat management system can be supported to work at lower temperature, a two-stage electric compressor is not needed, the production cost is reduced, and the use experience of a user is improved.
Description
Technical Field
The application relates to the technical field of electric vehicle thermal management, in particular to a control method and a control system of a thermal management system.
Background
With the rapid development of electric vehicles, the demand of the thermal management system of the electric vehicle is increasingly severe. In order to improve the endurance mileage of the electric automobile in the pure electric mode under the condition that the air conditioning system is opened, some electric automobiles adopt the heat pump air conditioning system. The lower limit temperature of the heat pump air conditioning system is usually-5 ℃ to-10 ℃ because of the limitation of the characteristics of the refrigerant. In order to widen the working range of the heat pump air conditioning system, the working temperature of the heat pump system is usually lowered to-15 ℃ by adopting a two-stage electric compressor in the prior art, but the reliability of the two-stage electric compressor is difficult to realize mass production on the whole vehicle in a short period, and the cost is higher.
Disclosure of Invention
In view of this, embodiments of the present application provide a control method and system for a thermal management system, so as to solve the problem that a heat pump air conditioning system cannot work at a low temperature.
In order to solve the above problem, the technical solution provided by the embodiment of the present application is as follows:
in a first aspect of the embodiments of the present application, a control method of a thermal management system is provided, where the control method is applied to the thermal management system,
the control method comprises the following steps:
when heating is needed, detecting whether the power battery stores heat or not; the power battery is a battery with a heat storage function;
if the power battery is used for storing heat, the refrigerant absorbs heat generated by the compressor through the first heating loop, absorbs outdoor heat through the heat exchanger in the second heating loop, absorbs heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release heat to the indoor;
the first heating loop comprises a gas-liquid separator, a compressor and a condenser; the second heating loop comprises the condenser, a heat exchanger, a gas-liquid separator and a compressor; the third heating loop includes the condenser, a cooling system, a gas-liquid separator, and a compressor.
In one possible implementation, the method further includes:
when the power battery is in heat storage utilization, detecting whether the outdoor temperature is smaller than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside;
when the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
When the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
In one possible implementation, the method further includes:
when the power battery is not used for storing heat, detecting whether the outdoor temperature is less than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside;
When the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop and is driven by the compressor to enter the condenser to release the heat to the indoor;
when the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor space, so that heating is realized.
In one possible implementation, the method further includes:
when the power battery is charged, acquiring a charging mode and heat storage strength; the charging mode comprises a fast charging mode and a slow charging mode; the heat storage intensity represents the heat storage demand intensity of the power battery; the charging mode and the heat storage intensity may be preset;
controlling the heater to be turned on or off according to the charging mode and the heat storage intensity; the heater is used for heating the power battery so that the power battery can reach the heat storage strength.
In one possible implementation, the controlling the heater to be turned on or off according to the charging mode and the heat storage intensity includes:
Acquiring a corresponding target temperature threshold according to the charging mode and the heat storage intensity; the target temperature threshold value represents the temperature to be reached by the power battery in the charging mode and the heat storage intensity; the target temperature threshold corresponds to the charging mode and the heat storage intensity;
judging whether the temperature of the power battery is smaller than a target temperature threshold value or not;
if the temperature of the power battery is smaller than the target temperature threshold value, starting the heater;
and if the temperature of the power battery is not less than the target temperature threshold value, turning off the heater.
In one possible implementation, the heat storage intensity includes no heat storage, low heat storage, medium heat storage, and high heat storage; the target temperature threshold is proportional to the heat storage intensity.
In one possible implementation, the target temperature threshold corresponding to no heat storage in the fast charge mode is greater than the target temperature threshold corresponding to no heat storage in the slow charge mode.
In one possible implementation, when refrigeration is required, the refrigerant absorbs indoor heat through the refrigeration circuit and releases the heat to the environment through the heat exchanger in the refrigeration circuit; the refrigeration loop comprises an evaporator, the gas-liquid separator, a compressor, a condenser and a heat exchanger.
In a second aspect of the embodiments of the present application, there is provided a thermal management system, including: an air conditioning system and a power battery thermal management system;
the air conditioning system includes: the system comprises a compressor, a gas-liquid separator, a condenser and a heat exchanger; the input end of the compressor is connected with the output end of the gas-liquid separator, and the output end of the compressor is connected with the input end of the condenser; the input end of the heat exchanger is connected with the output end of the condenser, and the output end of the heat exchanger is connected with the input end of the gas-liquid separator;
the power battery thermal management system comprises: a power battery and a cooling system; the power battery is a battery with a heat storage function;
the gas-liquid separator, the compressor and the condenser form a first heating loop through a first pipeline; the condenser, the heat exchanger, the gas-liquid separator and the compressor form a second heating loop through a second pipeline; the condenser, the cooling system, the gas-liquid separator and the compressor form a third heating loop through a third pipeline.
In one possible implementation manner, the power battery thermal management system further includes: a heater; the heater, the water pump and the power battery form a heating loop of the power battery through the fourth pipeline.
Therefore, the embodiment of the application has the following beneficial effects:
according to the control method provided by the embodiment of the application, when indoor heating is required, whether heat storage of the power battery can be utilized or not is judged at first, and when heat storage of the power battery can be utilized, the refrigerant absorbs heat through the first heating loop, the second heating loop and the third heating loop and enters the condenser to release the heat to the indoor space through the driving of the compressor, so that heating is achieved. Therefore, when the temperature is lower, the temperature and the pressure of the refrigerant can be improved by utilizing the heat storage of the power battery, so that the heat management system can be supported to work at lower temperature, a two-stage electric compressor is not needed, the production cost is reduced, and the use experience of a user is improved.
Drawings
Fig. 1 is a structural diagram of a thermal management system according to an embodiment of the present application;
fig. 2 is a control method of a thermal management system according to an embodiment of the present application;
FIG. 3 is a schematic flow diagram of a refrigerant provided in an embodiment of the present application;
FIG. 4 is another schematic refrigerant flow diagram provided in accordance with an embodiment of the present application;
FIG. 5 is a schematic flow diagram of yet another refrigerant provided in accordance with an embodiment of the present application;
FIG. 6 is a schematic flow diagram of another refrigerant provided in accordance with an embodiment of the present application;
Fig. 7 is a flowchart of a power battery charging control according to an embodiment of the present disclosure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
In order to facilitate understanding of the technical solutions provided in the present application, the following first describes the background art of the present application.
The inventor of the present invention has studied the conventional thermal management system, and found that the conventional thermal management system is generally operated at-5 ℃ to-10 ℃ because of the limited characteristics of the refrigerant. When the temperature is lower, the pressure of the suction gas of the compressor is lower, and the heating performance is influenced. In order to widen the working range of the heat pump air conditioning system, the traditional improvement method adopts a two-stage electric compressor to lower the working temperature of the heat pump system to-15 ℃. However, the reliability problem of the two-stage motor-driven compressor is not solved, and mass production is difficult in a short period of time and the cost is high.
Based on the characteristics of the battery of the whole automobile, the heat capacity of the power battery is utilized, when the heat needs to be generated, the refrigerant can absorb the heat released by the power battery, the air suction pressure of the compressor is increased, and then the heat released by the power battery can be utilized to generate heat indoors, so that the heat management system can work at a lower temperature, a two-stage electric compressor is not needed, and the production cost is reduced.
To facilitate understanding of the control method provided in the present application, the thermal management system in the present application will be described with reference to the accompanying drawings.
Referring to fig. 1, which is a block diagram of a thermal management system according to an embodiment of the present application, as shown in fig. 1, the system may include: an air conditioning system 100 and a battery thermal management system 200.
The air conditioning system 100 comprises a compressor 1, a condenser 2.2, a heat exchanger 3 and a gas-liquid separator 6. Wherein, the input end of the compressor 1 is connected with the output end of the gas-liquid separator 6, and the output end of the compressor 1 is connected with the input end of the condenser 2.2; the input end of the heat exchanger 3 is connected with the output end of the condenser 2.2, and the output end of the heat exchanger 3 is connected with the input end of the gas-liquid separator 6.
The power battery thermal management system 200 includes: a power battery 10 and a cooling system 11. This cooling system 11 is used for cooling down for power battery 10, avoids power battery temperature higher influence battery working property. The power battery 10 is a battery having a heat storage function.
In the present embodiment, the gas-liquid separator 6, the compressor 1 and the condenser 2.2 form a first heating circuit by means of a first line. In practical application, the compressor 1 obtains the refrigerant from the gas-liquid separator 6, converts kinetic energy into heat energy by applying work, absorbs heat, and enters the condenser 2.2 to be mixed with indoor cold air to release heat under the driving of the compressor 1.
The condenser 2.2, the heat exchanger 3, the gas-liquid separator 6 and the compressor 1 form a second heating circuit by means of a second line. In practical application, after releasing heat in the condenser 2.2, the refrigerant enters the heat exchanger 3 through the second pipeline, absorbs outdoor heat to become low-temperature and low-pressure gas, enters the gas-liquid separator 6 through the second pipeline, and outputs the gaseous refrigerant to the compressor 1 after gas-liquid separation. The compressor 1 does work to convert the low-temperature low-pressure refrigerant into high-temperature high-pressure gas, and the high-temperature high-pressure gas enters the condenser to release heat to the indoor space.
The condenser 2.2, the cooling system 11, the gas-liquid separator 6 and the compressor 1 form a third heating circuit by means of a third line. In practical application, after releasing heat in the condenser 2.2, the refrigerant absorbs the heat released by the power battery from the cooling system 11 through the third pipeline, enters the gas-liquid separator, and outputs the gaseous refrigerant to the compressor 1 after gas-liquid separation. The compressor 1 does work to convert the low-temperature low-pressure refrigerant into high-temperature high-pressure gas, and the high-temperature high-pressure gas enters the condenser to release heat to the indoor space.
In practical applications, to realize throttling control of the refrigerant, the air conditioning system may further include a first electronic expansion valve 4, and the first electronic expansion valve 4 is located between the condenser 2.2 and the heat exchanger 3. The condenser 2.2, the first electronic expansion valve 4, the heat exchanger 3, the gas-liquid separator 6 and the compressor 1 form a second heating circuit by means of a second line. In use, the refrigerant output from the condenser 2.2 is throttled by the first electronic expansion valve 4 and then enters the heat exchanger 3 to absorb heat from the outside.
Likewise, the thermal management system may further comprise a second electronic expansion valve 12, the second electronic expansion valve 12 being located between the condenser 2.2 and the cooling system 11. The condenser 2.2, the second electronic expansion valve 12, the cooling system 11, the gas-liquid separator 6 and the compressor 1 form a third heating circuit by means of a third line. In application, the refrigerant output from the condenser 2.2 is throttled by the second electronic expansion valve 12 and then passes through the cooling system 11 to absorb the heat released by the power battery.
The cooling system 11 comprises a cooler 7 and a water pump 8, and the cooler 7, the water pump 8 and the power battery 10 form a heat dissipation loop of the power battery through a fourth pipeline. It can be understood that power battery can release the heat when at the during operation, and for avoiding power battery overheat to influence battery performance, water pump 8 confirms that the coolant liquid absorbs the heat that power battery released through the fourth pipeline, and the coolant liquid cools off through cooler 7, and circulation flow cools down power battery.
It can be understood that the working performance of the power battery is very susceptible to temperature, especially in winter, under the condition that the outdoor environment temperature is low, the charging and discharging capacity of the power battery can be greatly reduced, the cruising ability of the electric vehicle is affected, and in order to ensure the normal work of the power battery, when the outdoor environment temperature is low, the power battery can be heated, and the charging and discharging capacity of the power battery is ensured. Therefore, the power battery thermal management system may further include a heater 9. Wherein, the heater 9, the water pump 8 and the power battery 10 form a heating loop of the power battery through a fourth pipeline. In practical application, two modes can be adopted to charge the power battery, one mode is a quick charging mode, and the other mode is a slow charging mode. In the quick charging mode, in order to improve the charging speed of the power battery, the water pump 8 drives the cooling liquid to flow, and the heater 9 heats the cooling liquid in the fourth pipeline. The power battery 10 increases its temperature by exchanging heat with the heated coolant.
It can be understood that the air conditioning system can not only heat, but also cool when the ambient temperature is high, and therefore, the air conditioning system can further include an evaporator 2.1, wherein the evaporator 2.1, the gas-liquid separator 6, the compressor 1, the first electronic expansion valve 4, the condenser 2.2, and the outdoor heat exchanger 3 form a refrigeration loop through a fifth pipeline. When refrigeration is needed, the refrigerant absorbs heat of a cooled object in the evaporator 2.1, is vaporized into low-temperature and low-pressure steam, is treated by the gas-liquid separator 6, is sucked by the compressor 1, is compressed into high-pressure and high-temperature steam, and is discharged into the condenser 2.2. Heat is released to a cooling medium (water or air) in the condenser 2.2, the heat is condensed into high-pressure liquid, the high-pressure liquid is throttled into a low-pressure low-temperature refrigerant by the first electronic expansion valve 4, and the low-pressure low-temperature refrigerant enters the evaporator 2.1 through the outdoor heat exchanger 3 again to absorb heat and vaporize, so that the aim of circulating refrigeration is fulfilled.
When practical application, air conditioning system's the function of heating and refrigeration function can not realize simultaneously, for control air conditioning system refrigerates or heats, air conditioning system still includes: a heating valve 5.1 and a cooling valve 5.2. The heating valve 5.1 is positioned between the heat exchanger 3 and the gas-liquid separator 6, and the refrigerating valve 5.2 is positioned between the heat exchanger 3 and the evaporator 2.1. When heating is needed, the heating valve 5.1 works; when refrigeration is required, the refrigeration valve 5.2 is operated.
The above embodiments describe the components of the thermal management system of the electric vehicle in detail, so that those skilled in the art can more clearly understand the specific application of the heat pipe system provided in the present application, the present application further provides a control method of the thermal management system of the electric vehicle, and the control method will be described below with reference to the accompanying drawings.
Referring to fig. 2, which is a flowchart of a control method of a thermal management system according to an embodiment of the present application, as shown in fig. 2, the method may include:
s201: when heating is needed, whether the power battery stores heat or not is detected, and the power battery is a battery with a heat storage function.
In this embodiment, when heating indoors is required, especially when the outdoor environment temperature is low, it is first detected whether the power battery has stored heat and can be used, so as to heat by using the stored heat in the heating process. It can be understood that, along with the increase of the endurance mileage of the whole vehicle, the capacity of the battery is gradually increased, and the heat capacity of the battery can be utilized to store heat, so that the battery is convenient to use during heating.
S202: if the power battery has heat storage utilization, the refrigerant absorbs heat generated by the compressor through the first heating loop, absorbs outdoor heat through the heat exchanger in the second heating loop, absorbs heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release heat to the indoor.
In this embodiment, when the power battery stores heat and is available, the refrigerant may absorb heat through the first heating circuit, the second heating circuit, and the third heating circuit, and finally, the refrigerant may be driven by the compressor to enter the condenser to release the heat to the indoor space.
The first heating loop comprises a gas-liquid separator, a compressor and a condenser; the second heating loop comprises a condenser, a heat exchanger, a gas-liquid separator and a compressor; the third heating loop includes a condenser, a cooling system, a gas-liquid separator, and a compressor.
In particular, reference may be made to the refrigerant flow direction diagram of fig. 3. The refrigerant enters the compressor 1 from the gas-liquid separator 6 through the first heating loop, is compressed by the compressor 1 to do work, and then is heated, enters the condenser 2 to exchange heat with indoor cold air. The refrigerant is output through the condenser 2.2 and enters the first electronic expansion valve 4, the refrigerant becomes low-temperature and low-pressure after being throttled by the first electronic expansion valve 4, the outdoor heat is absorbed by the heat exchanger 3, the refrigerant enters the gas-liquid separator 6 through the heating valve 5.1, the refrigerant enters the condenser 2.2 through the driving of the compressor 1 again, and the heat absorbed from the outdoor is released. Meanwhile, the refrigerant is output through the condenser 2.2 and enters the second electronic expansion valve 11, the refrigerant is changed into low temperature and low pressure after being throttled by the second electronic expansion valve 11, the heat released by the power battery 9 is absorbed by the cooler 4 and enters the gas-liquid separator 6, the refrigerant is processed by the gas-liquid separator 6 and then enters the condenser 2.2 through the driving of the compressor 1 again, and the heat absorbed by the power battery is released, so that the heating is realized.
In practical applications, when the outdoor ambient temperature is low, the refrigerant cannot absorb heat from the outdoor through the heat exchanger, so in specific implementations, the outdoor ambient temperature may also be judged to determine whether the refrigerant can absorb heat through the second heating circuit. The method specifically comprises the following steps:
when the power battery is in heat storage utilization, detecting whether the outdoor temperature is smaller than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside; when the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
When the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
That is, when the outdoor temperature is not less than the temperature threshold, the refrigerant may absorb heat from the outdoor through the heat exchanger, and at this time, the refrigerant may be heated through the first heating circuit, the second heating circuit, and the third heating circuit, as shown in fig. 3 in detail.
When the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs heat through the first heating circuit and the third heating circuit to heat. See in particular the refrigerant flow diagram of fig. 4. The refrigerant enters the compressor 1 from the gas-liquid separator 6 through the first heating loop, is compressed by the compressor 1 to do work, and then is heated, enters the condenser 2 to exchange heat with indoor cold air, and heating is achieved. The refrigerant is output by the condenser 2.2 and enters the second electronic expansion valve 11, the refrigerant is throttled by the second electronic expansion valve 11 and then is changed into low temperature and low pressure, the heat released by the power battery 9 is absorbed by the cooler 4 and enters the gas-liquid separator 6, the refrigerant is processed by the gas-liquid separator 6 and then is driven by the compressor 1 again to enter the condenser 2.2, and the heat absorbed by the power battery is released, so that heating is realized.
In addition, when no heat storage is available for the power battery, heating can be performed only by the air conditioning system, that is, heating can be performed by the first heating circuit and/or the second heating circuit. The method specifically comprises the following steps: when the power battery is not used for storing heat, detecting whether the outdoor temperature is less than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside; when the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop and is driven by the compressor to enter the condenser to release the heat to the indoor; when the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor space, so that heating is realized.
In practical application, when no heat storage is available and the outdoor temperature is lower than the temperature threshold value, the refrigerant can be compressed by the compressor in the first heating loop to generate heat, and then the refrigerant enters the condenser to release the heat to the indoor space to perform heating.
When no heat storage can be utilized and the outdoor temperature is not less than the temperature threshold value, heating can be realized through the first heating loop and the second heating loop. In particular implementations, reference may be made to the refrigerant flow direction shown in FIG. 5. The refrigerant enters the compressor 1 from the gas-liquid separator 6 through the first heating loop, is compressed by the compressor 1 to do work, and then is heated, enters the condenser 2 to exchange heat with indoor cold air. The refrigerant is output through the condenser 2.2 and enters the first electronic expansion valve 4, the refrigerant becomes low-temperature and low-pressure after being throttled by the first electronic expansion valve 4, the outdoor heat is absorbed by the heat exchanger 3, the refrigerant enters the gas-liquid separator 6 through the heating valve 5.1, the refrigerant enters the condenser 2.2 through the driving of the compressor 1 again, and the heat absorbed from the outdoor is released, so that the heating is realized.
In addition, when the power battery is charged, the power battery can be preheated through the heating loop. Referring to fig. 1, a heater 9 heats the coolant in the fifth pipeline, and the heated coolant is driven by a water pump 8 to circulate to heat a power battery 10. The method specifically comprises the following steps: when the power battery is charged, a charging mode and heat storage strength are obtained; the charging mode comprises a fast charging mode and a slow charging mode; the heat storage intensity represents the heat storage demand intensity of the power battery; the charging mode and the heat storage intensity can be preset; controlling the heater to be turned on or off according to the charging mode and the heat storage intensity; the heater is used for heating the power battery so that the power battery can reach the heat storage strength.
In practical application, a user can preset a charging mode and the intensity of heat storage demand on the power battery. When the power battery is charged by the charging pile, the controller can acquire the charging mode and the heat storage strength of the power battery so as to determine whether the power battery needs to be heated according to the charging mode and the heat storage strength.
In specific implementation, after a charging mode and heat storage intensity of the power battery are obtained, a corresponding target temperature threshold value under the charging mode and the heat storage intensity is obtained; wherein the target temperature threshold value represents the temperature to be reached by the power battery in the charging mode and the heat storage intensity; the target temperature threshold corresponds to the charging mode and the heat storage intensity; judging whether the temperature of the power battery is smaller than a target temperature threshold value or not; if the temperature of the power battery is smaller than the target temperature threshold value, starting the heater; and if the temperature of the power battery is not less than the target temperature threshold value, turning off the heater.
Wherein the heat storage strength comprises no heat storage, low heat storage, medium heat storage and high heat storage; the target temperature threshold is proportional to the heat storage intensity, and a higher heat storage intensity corresponds to a higher target temperature threshold. When the heat storage intensity is no heat storage, the target temperature threshold value corresponding to no heat storage in the fast charge mode is greater than the target temperature threshold value corresponding to no heat storage in the slow charge mode. When the heat storage intensity is low heat storage, medium heat storage or high heat storage, the charging mode does not need to be distinguished.
For ease of understanding, refer to the control flow shown in fig. 6, where 0 represents no heat storage requirement, 1 represents low heat storage requirement, 2 represents medium heat storage requirement, and 3 represents high heat storage requirement. When the power battery is charged, the charging mode and the heat storage strength are obtained. Firstly, judging whether the current heat storage intensity is 0, if so, judging whether the current charging mode is a quick charging mode, and if so, acquiring the heat storage intensity corresponding to the power battery. And if the heat storage intensity is 0, judging whether the current temperature of the power battery is smaller than a first target temperature threshold value, and if so, starting the heater to heat the power battery. If the power battery is in the slow charging mode, judging whether the current temperature of the power battery is smaller than a second target temperature threshold value, and if the current temperature of the power battery is smaller than the second target temperature threshold value, starting a heater to heat the power battery; if not, the heater is turned off.
If the current heat storage intensity is not 0 and is 1, judging whether the temperature of the power battery is smaller than a third target temperature threshold value, and if so, starting a heater to heat the power battery; if not, the heater is turned off. If the heat storage intensity is 2, judging whether the temperature of the power battery is smaller than a fourth target temperature threshold value, and if so, starting a heater to heat the power battery; if not, the heater is turned off. If the heat storage intensity is 3, judging whether the temperature of the power battery is smaller than a fifth target temperature threshold value, and if so, starting a heater to heat the power battery; if not, the heater is turned off.
The first target temperature threshold value represents a target temperature which the power battery needs to reach when no heat storage is required in the quick charging mode. The second target temperature threshold represents a target temperature that the power cell needs to reach without a heat storage requirement in the slow charge mode. The third target temperature threshold value represents that the power battery needs to reach the target temperature when the power battery is charged and the heat storage requirement is low; the fourth target temperature threshold value represents that the power battery needs to reach the target temperature when the power battery is charged and the power battery needs to reach the target temperature when the power battery needs to store heat; and the fifth target temperature threshold value represents that the power battery needs to reach the target temperature when the power battery is charged and the heat storage requirement is high.
In addition, when refrigeration is needed, the refrigerant absorbs indoor heat through the refrigeration loop and releases the heat to the environment through the heat exchanger in the refrigeration loop; the refrigeration loop comprises an evaporator, the gas-liquid separator, a compressor, a condenser and a heat exchanger. In particular, the refrigerant flow direction diagram shown in fig. 7 can be referred to. After absorbing heat of an object in the evaporator 2.2, the refrigerant is vaporized into low-temperature and low-pressure steam, is treated by the gas-liquid separator 6, is sucked by the compressor 1, is compressed into high-pressure and high-temperature steam, and is discharged into the condenser 2.1. The heat is released to a cooling medium (water or air) in the condenser 2.1, the heat is condensed into high-pressure liquid, the high-pressure liquid is throttled into a low-pressure low-temperature refrigerant by the first electronic expansion valve 4, and the low-pressure low-temperature refrigerant enters the evaporator 12 through the outdoor heat exchanger 3 and the refrigeration valve 5.2 again to absorb heat and vaporize, so that refrigeration is realized.
The heat management system that this application embodiment provided, when needing to heat indoor, at first judge power battery whether have the heat accumulation available, when power battery exists the heat accumulation available, judge whether present outdoor temperature is less than the temperature threshold, if outdoor temperature is not less than the temperature threshold, then the refrigerant absorbs the heat through first heating circuit, second heating circuit and third heating circuit to get into the condenser through the compressor drive and release the heat indoor. And if the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs heat through the first heating loop and the third heating loop, and the heat is driven by the compressor to enter the condenser to be released to the indoor space, so that heating is realized. When the power battery has no heat storage and can be used, the relation between the outdoor temperature and the temperature threshold is judged, and when the outdoor temperature is not less than the temperature threshold, the refrigerant can absorb heat through the first heating loop and the second heating loop, and finally enters the condenser to release the heat to the indoor space through the driving of the compressor, so that the heating is realized; when the outdoor temperature is lower than the temperature threshold value, the refrigerant cannot absorb outdoor heat through the heat exchanger in the second heating loop, and the refrigerant only absorbs heat generated by the work of the compressor through the first heating loop and enters the condenser to release the heat to the indoor space through the driving of the compressor, so that heating is realized. Therefore, when the temperature is lower, the temperature and the pressure of the refrigerant can be improved by utilizing the heat storage of the power battery, so that the heat management system can work at lower temperature, a two-stage electric compressor is not needed, and the production cost is reduced.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A control method of a thermal management system is applied to the thermal management system, and comprises the following steps:
when heating is needed, detecting whether the power battery stores heat or not; the power battery is a battery with a heat storage function;
if the power battery is used for storing heat, the refrigerant absorbs heat generated by the compressor through the first heating loop, absorbs outdoor heat through the heat exchanger in the second heating loop, absorbs heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release heat to the indoor;
The first heating loop comprises a gas-liquid separator, a compressor and a condenser; the second heating loop comprises the condenser, a heat exchanger, a gas-liquid separator and a compressor; the third heating loop includes the condenser, a cooling system, a gas-liquid separator, and a compressor.
2. The method of claim 1, further comprising:
when the power battery is in heat storage utilization, detecting whether the outdoor temperature is smaller than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside;
when the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
When the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, absorbs the heat released by the power battery through the cooling system in the third heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor.
3. The method of claim 1, further comprising:
when the power battery is not used for storing heat, detecting whether the outdoor temperature is less than a temperature threshold value; the temperature threshold is the lowest temperature at which the refrigerant absorbs heat from the outside;
when the outdoor temperature is lower than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop and is driven by the compressor to enter the condenser to release the heat to the indoor;
when the outdoor temperature is not less than the temperature threshold value, the refrigerant absorbs the heat generated by the compressor through the first heating loop, absorbs the outdoor heat through the heat exchanger in the second heating loop, and is driven by the compressor to enter the condenser to release the heat to the indoor space, so that heating is realized.
4. The method of claim 1, further comprising:
when the power battery is charged, acquiring a charging mode and heat storage strength; the charging mode comprises a fast charging mode and a slow charging mode; the heat storage intensity represents the heat storage demand intensity of the power battery; the charging mode and the heat storage intensity may be preset;
Controlling the heater to be turned on or off according to the charging mode and the heat storage intensity; the heater is used for heating the power battery so that the power battery can reach the heat storage strength.
5. The method according to claim 4, wherein the controlling the heater to be turned on or off according to the charging mode and the heat storage intensity comprises:
acquiring a corresponding target temperature threshold according to the charging mode and the heat storage intensity; the target temperature threshold value represents the temperature to be reached by the power battery in the charging mode and the heat storage intensity; the target temperature threshold corresponds to the charging mode and the heat storage intensity;
judging whether the temperature of the power battery is smaller than a target temperature threshold value or not;
if the temperature of the power battery is smaller than the target temperature threshold value, starting the heater;
and if the temperature of the power battery is not less than the target temperature threshold value, turning off the heater.
6. The method according to any one of claims 4 or 5, wherein the heat storage intensity includes no heat storage, low heat storage, medium heat storage, and high heat storage; the target temperature threshold is proportional to the heat storage intensity.
7. The method of claim 6, wherein the no-heat-storage-corresponding target temperature threshold in a fast-charge mode is greater than the no-heat-storage-corresponding target temperature threshold in a slow-charge mode.
8. The method according to claim 1, characterized in that it comprises:
when refrigeration is needed, the refrigerant absorbs indoor heat through a refrigeration loop and releases the heat to the environment through the heat exchanger in the refrigeration loop; the refrigeration loop comprises an evaporator, the gas-liquid separator, a compressor, a condenser and a heat exchanger.
9. A thermal management system, the system comprising: an air conditioning system and a power battery thermal management system;
the air conditioning system includes: the system comprises a compressor, a gas-liquid separator, a condenser and a heat exchanger; the input end of the compressor is connected with the output end of the gas-liquid separator, and the output end of the compressor is connected with the input end of the condenser; the input end of the heat exchanger is connected with the output end of the condenser, and the output end of the heat exchanger is connected with the input end of the gas-liquid separator;
the power battery thermal management system comprises: a power battery and a cooling system; the power battery is a battery with a heat storage function;
The gas-liquid separator, the compressor and the condenser form a first heating loop through a first pipeline; the condenser, the heat exchanger, the gas-liquid separator and the compressor form a second heating loop through a second pipeline; the condenser, the cooling system, the gas-liquid separator and the compressor form a third heating loop through a third pipeline.
10. The system of claim 9, wherein the power cell thermal management system further comprises: a heater; the heater, the water pump and the power battery form a heating loop of the power battery through the fourth pipeline.
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