CN110767957A - Composite heating system and heating method for power battery of hybrid power assembly - Google Patents
Composite heating system and heating method for power battery of hybrid power assembly Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 133
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 28
- 239000000110 cooling liquid Substances 0.000 claims abstract description 164
- 238000005338 heat storage Methods 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- 239000002826 coolant Substances 0.000 claims description 63
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 12
- 238000005265 energy consumption Methods 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000007726 management method Methods 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000005679 Peltier effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention relates to a composite heating system of a power battery of a hybrid power assembly, which comprises an engine cooling large circulation loop, a motor cooling circulation loop, a power battery cooling circulation loop, a PTC heating circulation loop, a heat storage heating circulation loop and a heat exchanger. When the battery needs to be heated, the heat exchanger is heated according to the PTC heating strategy, the engine cooling liquid heating strategy, the motor cooling liquid heating strategy and the heat storage heating strategy, and the heat exchanger rapidly heats the power battery to a temperature higher than the safe temperature according to the power battery heating strategy. The scheme solves the problems of low battery temperature rise rate and high system energy consumption in the battery heating process under different driving working conditions.
Description
Technical Field
The invention relates to a power battery of a hybrid electric vehicle, in particular to a composite heating system and a heating method of a power battery of a hybrid power assembly.
Background
The power battery is the only power source except the engine in the present hybrid power assembly, and the safety, the dynamic property and the economical efficiency of the whole vehicle are directly influenced by the performance of the power battery. When the lithium battery is in a low-temperature environment, on one hand, the frozen viscosity of the electrolyte is increased and even solidified, and the conductivity of the battery is reduced; the diffusion rate of the battery in the active material is reduced, the charge transfer impedance is increased, the charge and discharge capacity of the lithium battery is reduced rapidly in a low-temperature environment, and the dynamic property and the economical efficiency of the whole vehicle are seriously influenced. On the other hand, under the low temperature environment, lithium is seriously separated out from the negative electrode of the lithium battery, and particularly when the lithium battery is charged at low temperature, the dendritic crystal of the lithium separated out from the negative electrode of the battery is easy to pierce the solid electrolyte interface to cause the internal short circuit of the lithium battery, so that the thermal runaway of the battery is caused, and then the combustion and even the explosion occur, thereby seriously affecting the safety of the lithium battery.
At present, the battery heating method can be mainly divided into two types of internal heating and external heating. The internal heating is self-heating by using the internal resistance of the battery and heat generated by charging and discharging the battery. The external heating is a heating mode by an external heat source, and mainly comprises liquid or gas heating, heating by a heating plate or a heating sleeve, Peltier effect heating and the like.
Patent document [ CN 103457318A ] discloses a power battery charging and heating system and a heating method for a pure electric vehicle, wherein the charging and heating method comprises the following steps: during charging, if the temperature T of the power battery is less than or equal to the preset minimum temperature Tcritical, the vehicle-mounted charger provides electric energy for the PTC heater to perform low-temperature heating; and if the temperature T of the power battery is greater than the preset minimum temperature Tcritical, the low-temperature heating is quitted, and the normal charging mode is entered. The heating mode of the battery is single, and the energy consumption of the battery heating system is large.
Patent document CN 107839433a discloses a complete vehicle thermal management system of a plug-in hybrid electric vehicle. The thermal management system comprises a high-temperature cooling system, a medium-temperature cooling system, a low-temperature cooling system, a battery cooling system and an air conditioning system. When the pure electric working condition has the requirement of warm air, the passenger compartment is heated by utilizing the waste heat of the engine and the heat of the transmission. Although the invention utilizes the waste heat, the heating design of the battery is slightly insufficient, and the temperature rise rate of the battery is small.
At present, a hybrid vehicle type cannot effectively utilize waste heat, a battery heating mode is single, the temperature rise rate of the battery is low, and the energy consumption of a battery heating system is high. Therefore, a more optimized technical scheme is needed to solve the problems of the current thermal management system of the power battery.
Disclosure of Invention
The invention aims to provide a hybrid heating system and a heating method for a power battery of a hybrid power assembly, which are used for heating the power battery by combining the characteristics of multiple heat sources of the hybrid power assembly and a composite heat management method, and can solve the problems of single heating mode of the conventional battery, low battery temperature rise rate and high energy consumption of a battery heating system.
The technical scheme of the invention is as follows:
a composite heating system of a power battery of a hybrid power assembly comprises an engine cooling large circulation loop, a motor cooling circulation loop, a power battery cooling circulation loop, a PTC heating circulation loop, a heat storage heating circulation loop and a heat exchanger.
The engine cooling large circulation loop comprises an engine, an engine water pump, an engine radiator, a first valve and a second valve. The cooling liquid inlet of the engine is communicated with the cooling liquid outlet of the engine water pump, the cooling liquid inlet of the engine water pump is communicated with the cooling liquid outlet of the engine radiator, and the cooling liquid inlet of the engine radiator is communicated with the cooling liquid outlet of the engine; and a coolant inlet of the engine water pump is also communicated with a coolant outlet of the first valve, and a coolant outlet of the engine is also communicated with a coolant inlet of the second valve.
The motor cooling circulation loop comprises a motor, a motor controller, a motor radiator, a motor water pump, a third valve and a fourth valve. A cooling liquid inlet of the motor controller is communicated with a cooling liquid outlet of the motor water pump, a cooling liquid inlet of the motor water pump is communicated with a cooling liquid outlet of the motor radiator, a cooling liquid inlet of the motor radiator is communicated with a cooling liquid outlet of the motor, and a cooling liquid inlet of the motor is communicated with a cooling liquid outlet of the motor controller; and a cooling liquid inlet of the motor water pump is also communicated with a cooling liquid outlet of the third valve, and a cooling liquid outlet of the motor is also communicated with a cooling liquid inlet of the fourth valve.
The power battery cooling circulation loop comprises a power battery, a power battery water pump, a fifth valve, a sixth valve and a seventh valve. A cooling liquid inlet of the power battery is communicated with a cooling liquid outlet of the power battery water pump, a cooling liquid inlet of the power battery water pump is communicated with a cooling liquid outlet of the fifth valve, and a cooling liquid inlet of the fifth valve is communicated with a cooling liquid outlet of the power battery; and a cooling liquid outlet of the power battery is also communicated with a cooling liquid inlet of the sixth valve, and a cooling liquid inlet of the power battery water pump is also communicated with a cooling liquid outlet of the seventh valve.
The PTC heating circulation loop comprises a PTC heater, a PTC heater water pump, an eighth valve, a ninth valve and a tenth valve. A coolant inlet of the PTC heater is communicated with a coolant outlet of the PTC heater water pump, a coolant inlet of the PTC heater water pump is communicated with a coolant outlet of the eighth valve, and a coolant inlet of the eighth valve is communicated with a coolant outlet of the PTC heater; and a cooling liquid inlet of the PTC heater water pump is also communicated with a cooling liquid outlet of the ninth valve, and a cooling liquid outlet of the PTC heater is also communicated with a cooling liquid inlet of the tenth valve.
The heat storage and heating circulation loop comprises a heat storage device, a heat storage device water pump, an eleventh valve, a twelfth valve and a thirteenth valve. A cooling liquid inlet of the heat storage device is communicated with a cooling liquid outlet of the heat storage device water pump, a cooling liquid inlet of the heat storage device water pump is communicated with a cooling liquid outlet of the eleventh valve, and a cooling liquid inlet of the eleventh valve is communicated with a cooling liquid outlet of the heat storage device; and a cooling liquid inlet of the heat storage device water pump is also communicated with a cooling liquid outlet of the twelfth valve, and a cooling liquid outlet of the heat storage device is also communicated with a cooling liquid inlet of the thirteenth valve.
A high-temperature cooling liquid inlet of the heat exchanger is communicated with cooling liquid outlets of the second valve, the fourth valve, the tenth valve and the thirteenth valve, and a high-temperature cooling liquid outlet of the heat exchanger is communicated with cooling liquid inlets of the first valve, the third valve, the ninth valve and the twelfth valve; and a low-temperature cooling liquid inlet of the heat exchanger is communicated with a cooling liquid outlet of the sixth valve, and a low-temperature cooling liquid outlet of the heat exchanger is communicated with a cooling liquid inlet of the seventh valve.
A hybrid heating method for a hybrid power assembly power battery by using the hybrid heating system comprises the following thermal management control strategies: when the power battery needs to be heated, the heat exchanger is heated according to the PTC heating strategy, the engine coolant heating strategy, the motor coolant heating strategy and the heat storage heating strategy, and the heat exchanger heats the power battery according to the power battery heating strategy.
The specific process of the PTC heating strategy is as follows:
step a1, turning on the PTC heater and the PTC heater water pump, and entering step a 2.
And a2, judging the difference between the temperature of the cooling liquid of the PTC heating circulation loop and the temperature of the heat exchanger, if the difference is larger than or equal to the valve conduction threshold, entering a3, and otherwise, entering a 4.
Step a3, closing the eighth valve, opening the ninth valve and the tenth valve, and returning to step a 2.
And a4, judging the difference between the temperature of the cooling liquid in the PTC heating circulation loop and the temperature of the heat exchanger, if the difference is less than or equal to a valve cut-off threshold value, entering a step a5, otherwise, returning to a step a 2.
Step a5, opening the eighth valve, closing the ninth valve and the tenth valve, and returning to step a 2.
The engine coolant heating strategy comprises the following specific processes:
and b1, judging the difference between the temperature of the cooling liquid in the engine cooling large circulation loop and the temperature of the heat exchanger, if the difference is larger than or equal to the valve conduction threshold, entering step b2, and otherwise, entering step b 3.
And b2, opening the first valve and the second valve, and returning to the b 1.
And b3, judging the difference between the temperature of the cooling liquid in the engine cooling large circulation loop and the temperature of the heat exchanger, entering step b4 if the difference is less than or equal to a valve cut-off threshold, and otherwise, returning to step b 1.
And b4, closing the first valve and the second valve, and returning to the b 1.
The specific process of the motor cooling liquid heating strategy is as follows:
and c1, judging the difference between the temperature of the cooling liquid in the motor cooling circulation loop and the temperature of the heat exchanger, if the difference is more than or equal to the valve conduction threshold, entering step c2, and otherwise, entering step c 3.
And c2, opening the third valve and the fourth valve and returning to the step c 1.
And c3, judging the difference between the temperature of the cooling liquid in the motor cooling circulation loop and the temperature of the heat exchanger, entering the step c4 if the difference is less than or equal to a valve cut-off threshold, and otherwise, returning to the step c 1.
And c4, closing the third valve and the fourth valve and returning to the step c 1.
The heat storage heating strategy comprises the following specific processes:
and d1, starting a water pump of the heat storage device, and entering step d 2.
And d2, judging the difference between the temperature of the cooling liquid in the heat storage heating circulation loop and the temperature of the heat exchanger, if the difference is larger than or equal to the valve conduction threshold, entering step d3, and otherwise, entering step d 4.
And step d3, closing the eleventh valve, opening the twelfth valve and the thirteenth valve, and returning to the step d 2.
And d4, judging the difference between the temperature of the cooling liquid in the heat storage heating circulation loop and the temperature of the heat exchanger, if the difference is less than or equal to a valve stop threshold, entering the step d5, otherwise, returning to the step d 2.
And step d5, opening the eleventh valve, closing the twelfth valve and the thirteenth valve, and returning to the step d 2.
The specific flow of the power battery heating strategy is as follows:
and f1, judging the difference between the temperature of the heat exchanger and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference is larger than or equal to the valve conduction threshold, entering step f2, and otherwise, entering step f 3.
And f2, closing the fifth valve, opening the sixth valve and the seventh valve, and returning to the step f 1.
And f3, judging the difference value between the temperature of the heat exchanger and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference value is less than or equal to a valve cut-off threshold value, entering step f4, otherwise, returning to step f 1.
And f4, opening the fifth valve, closing the sixth valve and the seventh valve, and returning to the step f 1.
According to the hybrid heating method of the power battery of the hybrid power assembly, the valve conduction thresholds of the fifth valve, the eighth valve and the eleventh valve are less than the valve stop threshold, and the valve conduction thresholds of other valves are greater than the valve stop threshold.
The scheme realizes the heating of the hybrid power assembly power battery by various heat sources, and the invention has the following advantages:
1. the waste heat of the engine cooling loop and the motor cooling loop is used for heating the power battery, and the heat storage device is used for heating the power battery, so that the energy consumption of the power battery heating system is reduced.
2. Each heating mode indirectly heats the power battery through one heat exchanger, so that the cost of a heating system is reduced, the volume of the system is reduced, and meanwhile, the fluctuation of the inlet temperature of the power battery when different heating modes are switched is reduced.
3. The heating requirements of the power battery under different working conditions are met, the heating time of the power battery is effectively shortened through a composite heating mode, and the temperature rise rate of the power battery is improved.
Drawings
FIG. 1 is a schematic structural diagram of a hybrid heating system for a hybrid powertrain power cell of the present invention;
FIG. 2 is a flow chart of the strategy of the method of the present invention during PTC heating;
FIG. 3 is a flow chart of a strategy of the method of the present invention during engine coolant heating;
FIG. 4 is a flow chart of the strategy of the method of the present invention in the case of motor coolant heating;
FIG. 5 is a flow chart of the strategy of the method of the invention in heat storage and heating;
FIG. 6 is a flow chart of the strategy of the method of the invention when the power battery is heated;
FIG. 7 is a power battery temperature simulation diagram;
in the figure: 1-PTC heater water pump, 2-eighth valve, 3-ninth valve, 4-heat storage device water pump, 5-twelfth valve, 6-power battery, 7-sixth valve, 8-heat exchanger, 9-first valve, 10-engine radiator, 11-engine water pump, 12-engine, 13-second valve, 14-third valve, 15-motor water pump, 16-motor controller, 17-motor, 18-motor radiator, 19-fourth valve, 20-seventh valve, 21-fifth valve, 22-power battery water pump, 23-thirteenth valve, 24-eleventh valve, 25-heat storage device, 26-tenth valve, 27-PTC heater.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, a hybrid heating system for a hybrid power assembly power battery includes an engine cooling large circulation loop, a motor cooling circulation loop, a power battery cooling circulation loop, a PTC heating circulation loop, a heat storage heating circulation loop, and a heat exchanger 8.
The engine cooling large circulation loop comprises an engine 12, an engine water pump 11, an engine radiator 10, a first valve 9 and a second valve 13. A coolant inlet of the engine 12 is communicated with a coolant outlet of the engine water pump 11, a coolant inlet of the engine water pump 11 is communicated with a coolant outlet of the engine radiator 10, and a coolant inlet of the engine radiator 10 is communicated with a coolant outlet of the engine 12; the coolant inlet of the engine water pump 11 is also communicated with the coolant outlet of the first valve 9, and the coolant outlet of the engine 12 is also communicated with the coolant inlet of the second valve 13.
The motor cooling circulation loop comprises a motor 17, a motor controller 16, a motor radiator 18, a motor water pump 15, a third valve 14 and a fourth valve 19. A coolant inlet of the motor controller 16 is communicated with a coolant outlet of the motor water pump 15, a coolant inlet of the motor water pump 15 is communicated with a coolant outlet of the motor radiator 18, a coolant inlet of the motor radiator 18 is communicated with a coolant outlet of the motor 17, and a coolant inlet of the motor 17 is communicated with a coolant outlet of the motor controller 16; the cooling liquid inlet of the motor water pump 15 is also communicated with the cooling liquid outlet of the third valve 14, and the cooling liquid outlet of the motor 17 is also communicated with the cooling liquid inlet of the fourth valve 19.
The power battery cooling circulation loop comprises a power battery 6, a power battery water pump 22, a fifth valve 21, a sixth valve 7 and a seventh valve 20. A coolant inlet of the power battery 6 is communicated with a coolant outlet of the power battery water pump 22, a coolant inlet of the power battery water pump 22 is communicated with a coolant outlet of the fifth valve 21, and a coolant inlet of the fifth valve 21 is communicated with a coolant outlet of the power battery 6; the cooling liquid outlet of the power battery 6 is also communicated with the cooling liquid inlet of the sixth valve 7, and the cooling liquid inlet of the power battery water pump 22 is also communicated with the cooling liquid outlet of the seventh valve 20.
The PTC heating circulation circuit includes a PTC heater 27, a PTC heater water pump 1, an eighth valve 2, a ninth valve 3, and a tenth valve 26. A coolant inlet of the PTC heater 27 is communicated with a coolant outlet of the PTC heater water pump 1, a coolant inlet of the PTC heater water pump 1 is communicated with a coolant outlet of the eighth valve 2, and a coolant inlet of the eighth valve 2 is communicated with a coolant outlet of the PTC heater 27; the coolant inlet of the PTC heater water pump 1 is further communicated with the coolant outlet of the ninth valve 3, and the coolant outlet of the PTC heater 27 is further communicated with the coolant inlet of the tenth valve 26.
The heat storage and heating circulation loop comprises a heat storage device 25, a heat storage device water pump 4, an eleventh valve 24, a twelfth valve 5 and a thirteenth valve 23. A cooling liquid inlet of the heat storage device 25 is communicated with a cooling liquid outlet of the heat storage device water pump 4, a cooling liquid inlet of the heat storage device water pump 4 is communicated with a cooling liquid outlet of the eleventh valve 24, and a cooling liquid inlet of the eleventh valve 24 is communicated with a cooling liquid outlet of the heat storage device 25; and a cooling liquid inlet of the heat storage device water pump 4 is also communicated with a cooling liquid outlet of the twelfth valve 5, and a cooling liquid outlet of the heat storage device 25 is also communicated with a cooling liquid inlet of the thirteenth valve 23.
A high-temperature cooling liquid inlet of the heat exchanger 8 is communicated with cooling liquid outlets of the second valve 13, the fourth valve 19, the tenth valve 26 and the thirteenth valve 23, and a high-temperature cooling liquid outlet of the heat exchanger 8 is communicated with cooling liquid inlets of the first valve 9, the third valve 14, the ninth valve 3 and the twelfth valve 5; the low-temperature cooling liquid inlet of the heat exchanger 8 is communicated with the cooling liquid outlet of the sixth valve 7, and the low-temperature cooling liquid outlet of the heat exchanger 8 is communicated with the cooling liquid inlet of the seventh valve 20.
The thermal management control strategy is as follows: when the power battery 6 needs to be heated, the heat exchanger 8 is heated according to the PTC heating strategy, the engine coolant heating strategy, the motor coolant heating strategy and the heat storage heating strategy, and the heat exchanger 8 heats the power battery 6 according to the power battery heating strategy.
As shown in fig. 2, the specific process of the PTC heating strategy is as follows:
step a1, the PTC heater 27 and the PTC heater water pump 1 are turned on, and the process proceeds to step a 2.
And a2, judging the difference between the temperature of the cooling liquid in the PTC heating circulation loop and the temperature of the heat exchanger 8, if the difference is larger than or equal to the valve conduction threshold, entering a3, and otherwise, entering a 4.
Step a3, close the eighth valve 2, open the ninth valve 3 and the tenth valve 26, and return to step a 2.
And a4, judging the difference between the temperature of the cooling liquid in the PTC heating circulation loop and the temperature of the heat exchanger 8, if the difference is less than or equal to the valve cut-off threshold, entering a5, otherwise, returning to a 2.
Step a5, opening the eighth valve 2, closing the ninth valve 3 and the tenth valve 26, and returning to step a 2.
As shown in fig. 3, the specific flow of the engine coolant heating strategy is as follows:
and b1, judging the difference between the temperature of the cooling liquid in the engine cooling large circulation loop and the temperature of the heat exchanger 8, if the difference is larger than or equal to the valve conduction threshold, entering step b2, and otherwise, entering step b 3.
Step b2, opening the first valve 9 and the second valve 13, and returning to step b 1.
And b3, judging the difference between the temperature of the cooling liquid in the engine cooling large circulation loop and the temperature of the heat exchanger 8, if the difference is less than or equal to a valve cut-off threshold value, entering the step b4, otherwise, returning to the step b 1.
Step b4, closing the first valve 9 and the second valve 13, and returning to step b 1.
As shown in fig. 4, the specific flow of the motor coolant heating strategy is as follows:
and c1, judging the difference between the temperature of the cooling liquid in the motor cooling circulation loop and the temperature of the heat exchanger 8, if the difference is larger than or equal to the valve conduction threshold, entering step c2, and otherwise, entering step c 3.
Step c2, opening the third valve 14 and the fourth valve 19, and returning to step c 1.
And c3, judging the difference between the temperature of the cooling liquid in the motor cooling circulation loop and the temperature of the heat exchanger, entering the step c4 if the difference is less than or equal to a valve cut-off threshold, and otherwise, returning to the step c 1.
Step c4, closing the third valve 14 and the fourth valve 19, and returning to step c 1.
As shown in fig. 5, the specific flow of the heat storage heating strategy is as follows:
and d1, starting the water pump 4 of the heat storage device, and entering step d 2.
And d2, judging the difference between the temperature of the cooling liquid in the heat storage heating circulation loop and the temperature of the heat exchanger 8, if the difference is larger than or equal to the valve conduction threshold, entering step d3, and otherwise, entering step d 4.
Step d3, close the eleventh valve 24, open the twelfth valve 5 and the thirteenth valve 23, and return to step d 2.
And d4, judging the difference between the temperature of the cooling liquid in the heat storage heating circulation loop and the temperature of the heat exchanger 8, if the difference is less than or equal to a valve stop threshold, entering step d5, otherwise, returning to step d 2.
Step d5, opening the eleventh valve 24, closing the twelfth valve 5 and the thirteenth valve 23, and returning to step d 2.
As shown in fig. 6, the specific flow of the power battery heating strategy is as follows:
and f1, judging the difference between the temperature of the heat exchanger 8 and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference is larger than or equal to the valve conduction threshold, entering step f2, and otherwise, entering step f 3.
Step f2, close the fifth valve 21, open the sixth valve 7 and the seventh valve 20, and return to step f 1.
And f3, judging the difference value between the temperature of the heat exchanger 8 and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference value is less than or equal to a valve cut-off threshold value, entering step f4, otherwise, returning to step f 1.
Step f4, opening the fifth valve 21, closing the sixth valve 7 and the seventh valve 20, and returning to step f 1.
The valve on thresholds of the fifth valve, the eighth valve and the eleventh valve are < the valve off threshold, and the valve on thresholds of the other valves > the valve off thresholds, which are specifically set according to actual situations.
For further proving the advantages of the invention, under the conditions that the ambient temperature is-20 ℃ and the vehicle operation condition is the NEDC condition, simulation analysis is carried out on different battery heating schemes, wherein the scheme A-PTC heating, the scheme B-cooling liquid heating, the scheme C-heat storage heating and the scheme D-composite heat management heating are carried out. The power battery temperature for the various schemes is shown in fig. 7, and the results show that: compared with a PTC heating scheme, the composite heat management heating scheme has the advantages that the average temperature rise rate of the power battery heated from the ambient temperature to 0 ℃ is increased by 37.2%, and the energy consumption of the system is reduced by 27.1%.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the above embodiments, it will be understood by those of ordinary skill in the art that: it is still possible to modify the solutions described in the above embodiments or to substitute equally some of the technical features, for example, to change the positions of some of the components in the cooling circuit; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A composite heating system of a power battery of a hybrid power assembly is characterized by comprising an engine cooling large circulation loop, a motor cooling circulation loop, a power battery cooling circulation loop, a PTC heating circulation loop, a heat storage heating circulation loop and a heat exchanger;
the engine cooling large circulation loop comprises an engine, an engine water pump, an engine radiator, a first valve and a second valve; the cooling liquid inlet of the engine is communicated with the cooling liquid outlet of the engine water pump, the cooling liquid inlet of the engine water pump is communicated with the cooling liquid outlet of the engine radiator, and the cooling liquid inlet of the engine radiator is communicated with the cooling liquid outlet of the engine; the cooling liquid inlet of the engine water pump is also communicated with the cooling liquid outlet of the first valve, and the cooling liquid outlet of the engine is also communicated with the cooling liquid inlet of the second valve;
the motor cooling circulation loop comprises a motor, a motor controller, a motor radiator, a motor water pump, a third valve and a fourth valve; a cooling liquid inlet of the motor controller is communicated with a cooling liquid outlet of the motor water pump, a cooling liquid inlet of the motor water pump is communicated with a cooling liquid outlet of the motor radiator, a cooling liquid inlet of the motor radiator is communicated with a cooling liquid outlet of the motor, and a cooling liquid inlet of the motor is communicated with a cooling liquid outlet of the motor controller; a cooling liquid inlet of the motor water pump is also communicated with a cooling liquid outlet of the third valve, and a cooling liquid outlet of the motor is also communicated with a cooling liquid inlet of the fourth valve;
the power battery cooling circulation loop comprises a power battery, a power battery water pump, a fifth valve, a sixth valve and a seventh valve; a cooling liquid inlet of the power battery is communicated with a cooling liquid outlet of the power battery water pump, a cooling liquid inlet of the power battery water pump is communicated with a cooling liquid outlet of the fifth valve, and a cooling liquid inlet of the fifth valve is communicated with a cooling liquid outlet of the power battery; the cooling liquid outlet of the power battery is also communicated with the cooling liquid inlet of the sixth valve, and the cooling liquid inlet of the power battery water pump is also communicated with the cooling liquid outlet of the seventh valve;
the PTC heating circulation loop comprises a PTC heater, a PTC heater water pump, an eighth valve, a ninth valve and a tenth valve; a coolant inlet of the PTC heater is communicated with a coolant outlet of the PTC heater water pump, a coolant inlet of the PTC heater water pump is communicated with a coolant outlet of the eighth valve, and a coolant inlet of the eighth valve is communicated with a coolant outlet of the PTC heater; a cooling liquid inlet of the PTC heater water pump is also communicated with a cooling liquid outlet of the ninth valve, and a cooling liquid outlet of the PTC heater is also communicated with a cooling liquid inlet of the tenth valve;
the heat storage and heating circulation loop comprises a heat storage device, a heat storage device water pump, an eleventh valve, a twelfth valve and a thirteenth valve; a cooling liquid inlet of the heat storage device is communicated with a cooling liquid outlet of the heat storage device water pump, a cooling liquid inlet of the heat storage device water pump is communicated with a cooling liquid outlet of the eleventh valve, and a cooling liquid inlet of the eleventh valve is communicated with a cooling liquid outlet of the heat storage device; a cooling liquid inlet of the heat storage device water pump is also communicated with a cooling liquid outlet of the twelfth valve, and a cooling liquid outlet of the heat storage device is also communicated with a cooling liquid inlet of the thirteenth valve;
a high-temperature cooling liquid inlet of the heat exchanger is communicated with cooling liquid outlets of the second valve, the fourth valve, the tenth valve and the thirteenth valve, and a high-temperature cooling liquid outlet of the heat exchanger is communicated with cooling liquid inlets of the first valve, the third valve, the ninth valve and the twelfth valve; and a low-temperature cooling liquid inlet of the heat exchanger is communicated with a cooling liquid outlet of the sixth valve, and a low-temperature cooling liquid outlet of the heat exchanger is communicated with a cooling liquid inlet of the seventh valve.
2. A hybrid heating method of a hybrid power assembly power battery based on the hybrid heating system of claim 1, characterized in that when the power battery needs to be heated, the heat exchanger is heated according to a PTC heating strategy, an engine coolant heating strategy, a motor coolant heating strategy, and a heat storage heating strategy, and the heat exchanger heats the power battery according to the power battery heating strategy.
3. The hybrid heating method of a hybrid powertrain power battery as claimed in claim 2, wherein the specific process of the PTC heating strategy is as follows:
step a1, starting the PTC heater and the PTC heater water pump, and entering step a 2;
step a2, judging the difference between the temperature of the cooling liquid of the PTC heating circulation loop and the temperature of the heat exchanger, if the difference is more than or equal to the valve conduction threshold, entering step a3, otherwise entering step a 4;
step a3, closing the eighth valve, opening the ninth valve and the tenth valve, and returning to the step a 2;
step a4, judging the difference between the temperature of the cooling liquid of the PTC heating circulation loop and the temperature of the heat exchanger, if the difference is less than or equal to a valve cut-off threshold value, entering step a5, otherwise, returning to step a 2;
step a5, opening the eighth valve, closing the ninth valve and the tenth valve, and returning to step a 2.
4. The hybrid heating method of a hybrid powertrain power battery of claim 2, characterized in that the engine coolant heating strategy comprises the specific steps of:
step b1, judging the difference value between the temperature of the cooling liquid of the engine cooling large circulation loop and the temperature of the heat exchanger, if the difference value is larger than or equal to the valve conduction threshold value, entering step b2, otherwise entering step b 3;
step b2, opening the first valve and the second valve, and returning to the step b 1;
b3, judging the difference value between the temperature of the cooling liquid of the engine cooling large circulation loop and the temperature of the heat exchanger, if the difference value is less than or equal to a valve cut-off threshold value, entering a step b4, otherwise, returning to the step b 1;
and b4, closing the first valve and the second valve, and returning to the b 1.
5. The hybrid heating method of a hybrid powertrain power battery of claim 2, wherein the specific flow of the motor coolant heating strategy is as follows:
step c1, judging the difference value between the temperature of the cooling liquid of the motor cooling circulation loop and the temperature of the heat exchanger, if the difference value is larger than or equal to the valve conduction threshold value, entering step c2, otherwise entering step c 3;
step c2, opening the third valve and the fourth valve, and returning to the step c 1;
step c3, judging the difference value between the temperature of the cooling liquid of the motor cooling circulation loop and the temperature of the heat exchanger, if the difference value is less than or equal to a valve cut-off threshold value, entering the step c4, otherwise, returning to the step c 1;
and c4, closing the third valve and the fourth valve and returning to the step c 1.
6. The hybrid heating method of a hybrid powertrain power battery of claim 2, wherein the specific flow of the heat storage heating strategy is as follows:
step d1, starting a water pump of the heat storage device, and entering step d 2;
step d2, judging the difference value between the temperature of the cooling liquid of the heat storage heating circulation loop and the temperature of the heat exchanger, if the difference value is larger than or equal to the valve conduction threshold value, entering step d3, otherwise entering step d 4;
step d3, closing the eleventh valve, opening the twelfth valve and the thirteenth valve, and returning to the step d 2;
step d4, judging the difference value between the temperature of the cooling liquid of the heat storage heating circulation loop and the temperature of the heat exchanger, if the difference value is less than or equal to a valve stop threshold value, entering step d5, otherwise, returning to step d 2;
and step d5, opening the eleventh valve, closing the twelfth valve and the thirteenth valve, and returning to the step d 2.
7. The hybrid heating method for the hybrid power assembly power battery according to claim 2, wherein the specific flow of the power battery heating strategy is as follows:
step f1, judging the difference value between the temperature of the heat exchanger and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference value is larger than or equal to the valve conduction threshold value, entering step f2, otherwise entering step f 3;
step f2, closing the fifth valve, opening the sixth valve and the seventh valve, and returning to the step f 1;
step f3, judging the difference value between the temperature of the heat exchanger and the temperature of the cooling liquid of the power battery cooling circulation loop, if the difference value is less than or equal to a valve cut-off threshold value, entering step f4, otherwise, returning to step f 1;
and f4, opening the fifth valve, closing the sixth valve and the seventh valve, and returning to the step f 1.
8. The heating method of the hybrid heating system of the hybrid powertrain power battery according to claim 3, 4, 5, 6 or 7, wherein the valve on thresholds < valve off thresholds of the fifth valve, the eighth valve and the eleventh valve, and the valve on thresholds > valve off thresholds of the other valves.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111546945A (en) * | 2020-05-18 | 2020-08-18 | 东风小康汽车有限公司重庆分公司 | Heating device and heating control method of power battery and range-extended electric vehicle |
| CN113561852A (en) * | 2021-08-31 | 2021-10-29 | 岚图汽车科技有限公司 | Energy-saving extended-range PHEV thermal management system |
| CN116080352A (en) * | 2023-04-04 | 2023-05-09 | 徐州徐工汽车制造有限公司 | Hybrid vehicle |
-
2019
- 2019-09-10 CN CN201910853097.3A patent/CN110767957A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111546945A (en) * | 2020-05-18 | 2020-08-18 | 东风小康汽车有限公司重庆分公司 | Heating device and heating control method of power battery and range-extended electric vehicle |
| CN113561852A (en) * | 2021-08-31 | 2021-10-29 | 岚图汽车科技有限公司 | Energy-saving extended-range PHEV thermal management system |
| CN116080352A (en) * | 2023-04-04 | 2023-05-09 | 徐州徐工汽车制造有限公司 | Hybrid vehicle |
| CN116080352B (en) * | 2023-04-04 | 2024-01-09 | 徐州徐工汽车制造有限公司 | Hybrid vehicle |
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