CN111231769A - Electric vehicle heat management method and system - Google Patents
Electric vehicle heat management method and system Download PDFInfo
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- CN111231769A CN111231769A CN202010068041.XA CN202010068041A CN111231769A CN 111231769 A CN111231769 A CN 111231769A CN 202010068041 A CN202010068041 A CN 202010068041A CN 111231769 A CN111231769 A CN 111231769A
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- battery
- temperature
- thermal management
- chiller
- passenger compartment
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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
- B60L58/26—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 by cooling
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
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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
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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
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating 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
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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 invention relates to the technical field of electric vehicle thermal management, in particular to an electric vehicle thermal management method and system. The method comprises the following steps: s1: commanding a battery cooling demand; s2: acquiring an operation signal of a passenger compartment cooling circuit, executing the step S3 if the passenger compartment cooling circuit operates, and executing the step S4 if the passenger compartment cooling circuit is closed; s3: after the battery cooling loop is operated at the maximum flow for the first set time, the Chiller of the battery thermal management system is started; s4: the battery thermal management system, Chiller, is started directly while the battery cooling loop is running at maximum flow. The invention can solve the problem that the temperature of the passenger compartment is increased rapidly because the refrigerating effect of the passenger compartment is reduced by directly starting the battery for refrigerating in the prior art.
Description
Technical Field
The invention relates to the technical field of electric vehicle thermal management, in particular to an electric vehicle thermal management method and system.
Background
With the increasing attention of countries in the world to environmental and energy problems, pure electric vehicles are widely favored by various social circles, however, the development of the pure electric vehicles is still in the starting stage, a plurality of key problems need to be solved, and the development is limited by the technical maturity of the heat management system of the whole vehicle to a great extent. A set of excellent whole vehicle thermal management system has very obvious contributions to reducing battery energy consumption, increasing endurance mileage and improving reliability and comfort of a whole vehicle.
The electric vehicle thermal management system is a system for managing the temperature of a battery of an electric vehicle and managing the temperature of a passenger compartment of the electric vehicle.
For example, chinese patent CN109546234A discloses a power battery thermal management control method, a power battery thermal management system, and a vehicle. The power battery thermal management control method comprises the following steps: detecting the temperature of the power battery and the temperature of the cooling medium; and determining a corresponding temperature control mode according to the temperature interval of the power battery temperature and the temperature of the cooling medium, and adjusting the power battery temperature to a target temperature according to the determined temperature control mode, wherein different temperature control modes have different energy consumptions.
This whole car thermal management system of electric motor car, battery return circuit and air conditioning return circuit sharing refrigerant, when the battery needs the cooling, under the cryogenic prerequisite in passenger cabin, do not consider whole car travelling comfort, directly open the battery refrigeration, reduced passenger cabin refrigeration effect, can lead to passenger cabin temperature sharply to rise, reduced the comfort level in passenger cabin.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heat management method and a heat management system for an electric vehicle, which can solve the problem that the temperature of a passenger compartment is increased sharply due to the fact that the refrigeration effect of the passenger compartment is reduced by directly starting a battery for refrigeration in the prior art.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the invention provides an electric vehicle heat management method, which comprises the following steps:
s1: commanding a battery cooling demand;
s2: acquiring an operation signal of a passenger compartment cooling circuit, executing the step S3 if the passenger compartment cooling circuit operates, and executing the step S4 if the passenger compartment cooling circuit is closed;
s3: after the battery cooling loop is operated at the maximum flow for the first set time, the Chiller of the battery thermal management system is started;
s4: the battery thermal management system, Chiller, is started directly while the battery cooling loop is running at maximum flow.
On the basis of the above technical solution, the step S1 specifically includes:
acquiring battery temperature data;
and judging whether the temperature of the battery is greater than a preset battery safety temperature T0 or not according to the temperature of the battery, if so, giving a command of a battery cooling requirement, and if not, not giving the command of the battery cooling requirement.
On the basis of the technical scheme, after the step of S3 or S4, when the temperature of the battery is not more than the preset battery safety temperature T0, the Chiller of the battery thermal management system is closed.
On the basis of the technical scheme, the flow of the water pump is adjusted to a default gear while the Chiller of the battery thermal management system is closed.
On the basis of the technical scheme, when the Chiller of the battery thermal management system is started in the step S3, the flow rate of the water pump in the battery cooling loop is reduced to a first set threshold value, and the flow rate is increased to a second set threshold value within a second set time.
On the basis of the technical scheme, when the highest temperature of the battery is lower than a first preset highest temperature T1, and the average temperature of the battery is lower than a first preset average temperature T2, and the battery temperature is both greater than a preset battery safety temperature T0, a second set threshold value is set as a first gear;
when the highest battery temperature is lower than a second preset highest temperature T3 and higher than T1, and the average battery temperature is lower than a second preset average temperature T4 and higher than T2, setting a second set threshold value as a second gear;
when the highest battery temperature is lower than a third preset highest temperature T5 and the average battery temperature is lower than a third preset average temperature T6, setting a second set threshold as a third gear;
and T1 is more than T3 and more than T5, T2 is more than T4 and more than T6, and the flow rates of the first gear, the second gear and the third gear are increased in sequence.
On the basis of the technical scheme, the time for increasing the flow of the water pump from the first set threshold to the second set threshold is calibrated according to the gear corresponding to the second set threshold.
On the basis of the technical scheme, when the flow rate of the water pump is increased from the first set threshold to the second set threshold, the passenger compartment cooling circuit is closed, and the flow rate of the water pump is directly increased to the second set threshold.
The invention also provides an electric vehicle thermal management system, comprising:
a passenger compartment cooling circuit, comprising:
-a refrigeration device;
-a passenger compartment cooling passage in communication with the refrigeration device;
a communication passage connected in parallel with the passenger compartment cooling passage;
the battery cooling loop comprises a water pump and a battery thermal management system Chiller, and the communication passage is communicated with the battery cooling loop and communicated with the battery thermal management system Chiller;
a battery cooling circuit control system, comprising:
-a battery temperature monitoring module for acquiring battery temperature data, instructing the battery cooling requirement on the basis of the temperature of the battery;
the Chiller control module is used for judging whether the battery cooling circuit is started to the maximum flow setting time or not according to the acquired operation signal of the passenger compartment cooling circuit, and then starting the Chiller of the battery thermal management system.
On the basis of the technical scheme, the communication passage is provided with a temperature sensing expansion valve TXV which is opened and closed with the Chiller of the battery thermal management system at the same time.
Compared with the prior art, the invention has the advantages that: when the electric vehicle thermal management method and the electric vehicle thermal management system are used, firstly, a battery temperature monitoring module is used for monitoring and sending a command of battery cooling requirements; acquiring an operation signal of a passenger compartment cooling loop through a Chiller control module, and if the passenger compartment cooling loop operates, operating the battery cooling loop at the maximum flow for a first set time, and then starting a Chiller of the battery thermal management system; if the passenger compartment cooling circuit is closed, the battery thermal management system Chiller is directly started, and meanwhile, the battery cooling circuit is operated at the maximum flow rate. The temperature and the Chiller in the battery can be slightly reduced by opening the battery cooling loop and operating the first set time, and then the Chiller is started to operate, so that the cold energy absorbed by the Chiller of the battery thermal management system is reduced, the reduction amount of the cold energy in the passenger compartment is reduced, the temperature in the passenger compartment is not suddenly increased, and the riding experience of passengers is improved.
Drawings
FIG. 1 is a flow chart of a method for thermal management of an electric vehicle in an embodiment of the present invention;
FIG. 2 is a flowchart of an electric vehicle thermal management system according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for thermal management of an electric vehicle in an embodiment of the present invention; as shown in fig. 1:
the invention provides an electric vehicle heat management method, which comprises the following steps:
s1: a battery cooling demand is commanded.
The step S1 specifically includes: acquiring battery temperature data; and judging whether the temperature of the battery is greater than a preset battery safety temperature T0 or not according to the temperature of the battery, if so, giving a command of a battery cooling requirement, and if not, not giving the command of the battery cooling requirement.
S2: and acquiring an operation signal of the passenger compartment cooling circuit, executing the step S3 if the passenger compartment cooling circuit is operated, and executing the step S4 if the passenger compartment cooling circuit is closed.
In this embodiment, when the passenger compartment cooling circuit is in operation, because the temperature of the battery is very high, the battery thermal management system Chiller and the battery cooling circuit are suddenly started, and the battery thermal management system Chiller can absorb a large amount of cold energy generated by the cooling device, so that the cold energy in the passenger compartment is suddenly reduced, the temperature in the passenger compartment suddenly rises, and bad riding experience can be caused.
S3: and after the battery cooling loop is operated at the maximum flow for the first set time, the Chiller of the battery thermal management system is started.
In this embodiment, before the temperature of the battery rises to the point where the temperature of the battery needs to be reduced, the temperature of the cooling liquid in the battery cooling circuit is very low, except that the temperature of the cooling liquid near the battery is very high, the temperature and the Chiller in the whole battery cooling circuit are still very low, at this time, the battery cooling circuit is opened to operate for a set time first, so that the temperature and the Chiller in the battery can be slightly reduced, and then the Chiller is started to operate, so that the cooling capacity absorbed by the Chiller in the battery thermal management system is reduced, the reduction amount of the cooling capacity in the passenger compartment is reduced, the temperature in the passenger compartment cannot.
Preferably, while the battery thermal management system Chiller is activated in S3, the flow rate of the water pump in the battery cooling circuit is decreased to a first set threshold, and the flow rate is increased to a second set threshold for a second set time.
In this embodiment, when the battery thermal management system Chiller is started, the flow rate of the water pump in the battery cooling loop is reduced to the first set threshold, and the flow rate is increased to the second set threshold within the second set time, so that the cooling capacity absorbed by the battery thermal management system Chiller is gradually increased, the temperature of the battery is gradually decreased, and the safety of the battery can also be ensured. Furthermore, the cold quantity in the passenger compartment can not be greatly reduced suddenly, and the temperature in the passenger compartment can not be increased suddenly, so that the riding experience of passengers is improved.
Preferably, when the maximum battery temperature is lower than the first preset maximum temperature T1 and the average battery temperature is lower than the first preset average temperature T2, both of which are greater than the preset battery safety temperature T0, the second set threshold is set to the first gear.
When the battery highest temperature is lower than the second preset highest temperature T3 and higher than T1, and the battery average temperature is lower than the second preset average temperature T4 and higher than T2, the second set threshold is set to the second gear.
When the highest battery temperature is lower than a third preset highest temperature T5 and the average battery temperature is lower than a third preset average temperature T6, setting a second set threshold as a third gear;
and T1 is more than T3 and more than T5, T2 is more than T4 and more than T6, and the flow rates of the first gear, the second gear and the third gear are increased in sequence.
In this embodiment, according to the difference of battery temperature, set for different circulation circuit velocity of flow, control more accurately, both can guarantee the security that the battery used like this, also can make passenger cabin have better to take and experience, further avoided passenger cabin's temperature to rise suddenly, lead to passenger cabin's comfort level to reduce.
Preferably, the time for increasing the flow of the water pump from the first set threshold to the second set threshold is calibrated according to the gear corresponding to the second set threshold.
In this embodiment, the higher the gear is, the longer the time for increasing the gear from the first set threshold to the second set threshold is, such a design can make the speed of the Chiller absorbing the cooling energy of the refrigeration device more moderate, thereby not only ensuring the continuous cooling of the battery, but also further avoiding the sudden temperature rise of the passenger compartment.
Preferably, when the flow rate of the water pump is increased from the first set threshold to the second set threshold, the passenger compartment cooling circuit is closed, and the flow rate of the water pump is directly increased to the second set threshold.
In this embodiment, when the flow rate increases from the first set threshold to the second set threshold, the passenger compartment cooling circuit is closed, which means that the passenger compartment does not need the cooling capacity of the cooling device, and all the cooling capacity can be used for cooling the battery.
S4: the battery thermal management system, Chiller, is started directly to run the battery cooling loop at maximum flow.
Preferably, S5: and when the temperature of the battery is not greater than the preset battery safety temperature T0, shutting down a Chiller of the battery thermal management system.
Preferably, the flow rate of the water pump is adjusted to a default gear while the Chiller of the battery thermal management system is turned off. In this embodiment, adjusting the water pump flow to the default gear is to turn off the water pump.
Fig. 2 is a flowchart of an electric vehicle thermal management system according to an embodiment of the present invention, and as shown in fig. 2, the present invention further provides an electric vehicle thermal management system, including: a passenger compartment cooling circuit, comprising: a refrigeration device; a passenger compartment cooling passage in communication with the refrigeration device;
the system further includes a communication passage in parallel with the passenger compartment cooling passage; the battery cooling circuit comprises a water pump and a battery thermal management system Chiller, and the communication passage is communicated with the battery cooling circuit and is connected with the battery thermal management system Chiller.
The system also includes a battery cooling loop control subsystem, which includes: the battery temperature monitoring module is used for acquiring battery temperature data and sending a command of the battery cooling requirement according to the temperature of the battery; the control device also comprises a Chiller control module which is used for judging whether the battery cooling loop is started to the maximum flow setting time or not according to the acquired running signal of the passenger compartment cooling loop and then starting the Chiller of the battery thermal management system.
When the thermal management system of the electric vehicle is used, firstly, a battery temperature monitoring module is used for monitoring and sending a command of battery cooling requirements; acquiring an operation signal of a passenger compartment cooling loop through a Chiller control module, and if the passenger compartment cooling loop operates, operating the battery cooling loop at the maximum flow for a first set time, and then starting a Chiller of the battery thermal management system; if the passenger compartment cooling circuit is closed, the battery thermal management system Chiller is directly started, and meanwhile, the battery cooling circuit is operated at the maximum flow rate. The temperature and the Chiller in the battery can be slightly reduced by opening the battery cooling loop and operating the first set time, and then the Chiller is started to operate, so that the cold energy absorbed by the Chiller of the battery thermal management system is reduced, the reduction amount of the cold energy in the passenger compartment is reduced, the temperature in the passenger compartment is not suddenly increased, and the riding experience of passengers is improved.
Preferably, a temperature sensing expansion valve TXV is arranged on the communication passage and is opened and closed with the battery thermal management system childler at the same time.
In this embodiment, the communication path is provided with a temperature sensing expansion valve TXV which is opened and closed simultaneously with the battery thermal management system Chiller, and when the passenger compartment cooling circuit is protected to operate and the battery thermal management system Chiller does not operate, the cooling capacity of the refrigeration device flows to the battery cooling circuit.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone with the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, are within the protection scope.
Claims (10)
1. The electric vehicle thermal management method is characterized by comprising the following steps:
s1: commanding a battery cooling demand;
s2: acquiring an operation signal of a passenger compartment cooling circuit, executing the step S3 if the passenger compartment cooling circuit operates, and executing the step S4 if the passenger compartment cooling circuit is closed;
s3: after the battery cooling loop is operated at the maximum flow for the first set time, the Chiller of the battery thermal management system is started;
s4: the battery thermal management system, Chiller, is started directly while the battery cooling loop is running at maximum flow.
2. The electric vehicle thermal management method according to claim 1, wherein the step S1 specifically comprises:
acquiring battery temperature data;
and judging whether the temperature of the battery is greater than a preset battery safety temperature T0 or not according to the temperature of the battery, if so, giving a command of a battery cooling requirement, and if not, not giving the command of the battery cooling requirement.
3. The electric vehicle thermal management method according to claim 2, wherein the Chiller is turned off when the temperature of the battery is not greater than the preset battery safety temperature T0 after the step S3 or S4.
4. The electric vehicle thermal management method of claim 3, wherein the flow of the water pump is adjusted to a default gear while the Chiller of the battery thermal management system is turned off.
5. The electric vehicle thermal management method according to claim 1, wherein the flow rate of the water pump in the battery cooling circuit is reduced to a first set threshold value and increased to a second set threshold value for a second set time while the battery thermal management system Chiller is activated in S3.
6. The electric vehicle thermal management method according to claim 5,
when the highest battery temperature is lower than a first preset highest temperature T1, and the average battery temperature is lower than a first preset average temperature T2, and the battery temperatures are all greater than a preset battery safety temperature T0, setting a second set threshold as a first gear;
when the highest battery temperature is lower than a second preset highest temperature T3 and higher than T1, and the average battery temperature is lower than a second preset average temperature T4 and higher than T2, setting a second set threshold value as a second gear;
when the highest battery temperature is lower than a third preset highest temperature T5 and the average battery temperature is lower than a third preset average temperature T6, setting a second set threshold as a third gear;
and T1 is more than T3 and more than T5, T2 is more than T4 and more than T6, and the flow rates of the first gear, the second gear and the third gear are increased in sequence.
7. The electric vehicle thermal management method of claim 6, wherein: and the time for increasing the flow of the water pump from the first set threshold to the second set threshold is calibrated according to the gear corresponding to the second set threshold.
8. The electric vehicle thermal management method according to claim 5, wherein: when the flow rate of the water pump is increased from the first set threshold to the second set threshold, the passenger compartment cooling circuit is closed, and the flow rate of the water pump is directly increased to the second set threshold.
9. A system for implementing the method of claim 1, comprising:
a passenger compartment cooling circuit, comprising:
-a refrigeration device;
-a passenger compartment cooling passage in communication with the refrigeration device;
a communication passage connected in parallel with the passenger compartment cooling passage;
the battery cooling loop comprises a water pump and a battery thermal management system Chiller, and the communication passage is communicated with the battery cooling loop and communicated with the battery thermal management system Chiller;
a battery cooling circuit control system, comprising:
-a battery temperature monitoring module for acquiring battery temperature data, instructing the battery cooling requirement on the basis of the temperature of the battery;
the Chiller control module is used for judging whether the battery cooling circuit is started to the maximum flow setting time or not according to the acquired operation signal of the passenger compartment cooling circuit, and then starting the Chiller of the battery thermal management system.
10. The thermal management system of an electric vehicle of claim 9, wherein said communication path is provided with a temperature sensitive expansion valve TXV which is opened and closed simultaneously with said battery thermal management system Chiller.
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| CN202010068041.XA CN111231769B (en) | 2020-01-20 | 2020-01-20 | Electric vehicle heat management method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114559857A (en) * | 2022-04-06 | 2022-05-31 | 广汽埃安新能源汽车有限公司 | Thermal management system control method and device |
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| CN114559857B (en) * | 2022-04-06 | 2023-12-12 | 广汽埃安新能源汽车有限公司 | Control method and device for thermal management system |
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