CN107453008B - Battery pack heating system for pure electric vehicle and control method thereof - Google Patents
Battery pack heating system for pure electric vehicle and control method thereof Download PDFInfo
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- CN107453008B CN107453008B CN201710826754.6A CN201710826754A CN107453008B CN 107453008 B CN107453008 B CN 107453008B CN 201710826754 A CN201710826754 A CN 201710826754A CN 107453008 B CN107453008 B CN 107453008B
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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
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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
- 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
- B60L58/27—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 heating
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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
- H01M10/613—Cooling or keeping cold
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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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/65—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
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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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
- H01M10/65—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
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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
- H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
- H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
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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
- 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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- 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 discloses a battery pack heating system for a pure electric vehicle and a control method thereof, and belongs to the technical field of pure electric vehicles. The system comprises: the electric driving system is used for providing driving force for the whole vehicle, and the electric driving system is communicated with the circulating pump I, the valve I and the radiator to form a cold circulating loop; the first heating circulation loop is formed by communicating a cold circulation loop branch inlet, a circulation pump II, a valve II, a heat exchanger and a cold circulation loop branch outlet; and the internal circulation loop of the battery pack system is formed by communicating a battery pack system pipeline with the heat exchanger. The invention can ensure that the battery pack keeps a proper temperature, ensures the system performance of the battery pack, achieves the good effects of reasonably utilizing the energy in the vehicle and saving the energy, and can be widely applied to the related technical fields of heating the battery pack with large capacity, particularly the battery pack of a pure electric vehicle.
Description
Technical Field
The invention relates to the technical field of pure electric vehicles, in particular to a battery pack heating system for a pure electric vehicle and a control method thereof.
Background
With exhaustion of global petroleum resources and rigorous national emission regulations, electric automobiles are increasingly valued by various large factories in China due to renewable electric energy resources, cleanliness and no pollution. The large whole automobile factories compete with each other and invest huge manpower and material resources to develop hybrid electric vehicles, pure electric vehicles, plug-in hybrid electric vehicles and the like, but the technical threshold of the hybrid electric vehicles and the plug-in hybrid electric vehicles is higher, the pure electric vehicles are regarded as one direction of curve overtaking of the whole automobile factories in China, and a large number of pure electric vehicles are emerging in the domestic automobile market at present.
Air-cooled high-capacity battery packs without heating function are commonly adopted in domestic pure electric vehicles, but the existing high-capacity battery packs have the problems of serious low-temperature performance attenuation, insufficient power, low efficiency, overlong low-temperature charging time, insufficient charging and the like, and the problems cannot be effectively improved because the air-cooled battery packs have no heating function.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a battery pack heating system for a pure electric vehicle and a control method thereof. The technical scheme is as follows:
in one aspect, a battery pack heating system for a pure electric vehicle is provided, including:
the electric driving system is used for providing driving force for the whole vehicle, and the electric driving system is communicated with the circulating pump I, the valve I and the radiator to form a cold circulating loop;
the first heating circulation loop is formed by communicating a cold circulation loop branch inlet, a circulation pump II, a valve II, a heat exchanger and a cold circulation loop branch outlet;
and the internal circulation loop of the battery pack system is formed by communicating a battery pack system pipeline with the heat exchanger.
Preferably, the electric driving system comprises a driving motor, an LE, a DCDC and an electric air conditioner, wherein the first valve is a two-way valve, two valve ports of the first valve are respectively communicated with the water inlet of the radiator and the water inlet of the electric air conditioner, and the water outlet of the electric air conditioner is communicated with the water inlet of the radiator.
Preferably, the battery pack system pipeline is formed by connecting a circulating pump III, a battery pack pipeline and a charger pipeline.
Preferably, the system further comprises: the second heating circulation loop is formed by communicating an electric heater, a valve III, a circulating pump IV and the heat exchanger.
Preferably, the electric heater is communicated with the valve IV, the circulating pump V and the warm air heat exchanger to form a warm air circulating loop.
Preferably, the heat exchanger is a two-pass heat exchanger.
Preferably, the system further comprises a balancing tank device which is communicated with the electric drive system pipeline, the first heating circulation loop, the second heating circulation loop, the warm air circulation loop and/or the internal circulation loop of the battery pack system, and the balancing tank device is used for carrying out automatic compensation operation and exhaust operation of the heat circulation medium.
Preferably, the system further comprises a control device, the control device is electrically connected with all electric devices comprising the radiator, the heat exchanger, the first circulating pump, the second circulating pump, the first valve and the second valve in the system, and the control device is used for controlling the flow direction and the flow rate of the heat circulation medium in the pipeline of the whole system.
In another aspect, there is provided a control method of a battery pack heating system according to the above-mentioned aspect, including the steps of:
starting the cold circulation loop of the electric drive system, wherein the second circulation pump is in a closed state, and the second valve is in a non-conducting state;
monitoring and judging whether the battery pack system has a heating requirement in real time, if not, keeping the states of the circulating pump II and the valve II unchanged; if yes, further judging whether the whole vehicle operation is met and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, if yes, starting the valve II and the circulating pump II, and if no, returning to the step of judging whether the battery pack system has heating requirements for circulating until the step is finished.
Preferably, the control method of the battery pack heating system includes the following steps:
a. the cold circulation loop of the electric drive system is started, the second circulation pump and the fourth circulation pump are in a closed state, and the second valve and the third valve are in a non-conducting state;
b. starting the circulating pump three to preset low power;
c. b, monitoring and judging whether the battery pack system has a heating requirement in real time, if not, returning to the step b for circulation; if yes, further judging whether the temperature of the battery pack is lower than a preset limit value, if not, entering a step d 1; if yes, go to step d2, wherein,
d1, lifting the third circulating pump to preset middle power, judging whether the whole vehicle operation is met or not, and if so, opening the second valve and the second circulating pump, wherein the temperature of the cooling liquid of the electric drive system is higher than that of the battery pack system; if not, opening the valve III and the circulating pump IV;
d2, lifting the third circulating pump to a preset high power, judging whether the whole vehicle operation is met or not, and if so, starting the second valve, the second circulating pump, the third valve and the circulating pump, wherein the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system; if not, opening the valve III and the circulating pump IV.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
according to the battery pack heating system and the control method thereof provided by the embodiment of the invention, a new heating circulation loop is added outside a cold circulation loop of the electric drive system, the heating circulation loop is communicated with a battery pack system pipeline, waste heat generated by the electric drive system is utilized for heating the battery pack, and compared with the prior art, the following excellent technical effects are achieved:
1. the technical defect that the existing battery pack air cooling technology of the pure electric vehicle cannot heat is overcome through the heating circulation loop communicated with the electric drive system cooling circulation loop, the battery pack is effectively heated, the technical problems that the battery pack charge and discharge capacity is seriously attenuated and the power is insufficient and the efficiency is low when the whole vehicle runs at low temperature are solved, and therefore the low-temperature running performance and the efficiency of the whole vehicle are improved;
2. the waste heat generated by the operation of the electric drive system is used as a heat source to heat the battery pack, so that the whole vehicle energy is not consumed, and the good effects of reasonably utilizing the energy in the vehicle and saving the energy are achieved;
3. the battery pack can be effectively heated by only adding a heating circulation loop outside the cold circulation loop of the electric drive system, and the battery pack heating device has the advantages of simple structure, convenient operation and lower cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of the control of the operation of the cooling circuit of the electric drive system of the battery pack heating system according to the embodiment of the invention;
fig. 3 is a flowchart of a first heating cycle operation control of the battery pack heating system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention;
fig. 5 is a flowchart of a second heating cycle operation control of the battery pack heating system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a heating operation control of the battery pack heating system according to an embodiment of the present invention.
Wherein reference numerals are as follows:
the system comprises a circulating pump I-P1, a circulating pump II-P2, a circulating pump III-P3, a circulating pump IV-P4, a circulating pump V-P5, a valve I-valve 1, a valve II-valve 2, a valve III-valve 3 and a valve IV-valve 4.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," "step a," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying an order of magnitude of the indicated technical features. Thus, a feature defining "a first", "a second", etc. may include one or more of the feature, either explicitly or implicitly. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
The embodiment of the invention provides a battery pack heating system for a pure electric vehicle and a control method thereof, wherein a new heating circulation loop is additionally arranged outside a cold circulation loop of an electric drive system, the heating circulation loop is communicated with a battery pack system pipeline, waste heat generated by the electric drive system is utilized for heating a battery pack, so that the battery pack keeps a proper temperature, the performance of the battery pack system is ensured, the problems of serious low-temperature performance attenuation, insufficient power, low efficiency, overlong low-temperature charging time, insufficient charging and the like caused by the excessively low-temperature battery pack are avoided, the good effects of reasonably utilizing in-vehicle energy and saving energy are achieved, and the battery pack heating system can be widely applied to the related technical fields of heating of large-capacity battery packs, especially battery packs of pure electric vehicles.
The battery pack heating system for the pure electric vehicle and the control method thereof provided by the embodiment of the invention are specifically described below with reference to the embodiments and the accompanying drawings.
Fig. 1 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention. As shown in fig. 1, a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention includes: an electric drive system pipeline, a first heating circulation loop and a battery pack system internal circulation loop.
Specifically, the electric drive system pipeline is a pipeline arranged around the electric drive system of the whole vehicle and is used for radiating heat for the electric drive system, the electric drive system is mainly used for providing driving force for the whole vehicle, the electric drive system pipeline is communicated with the P1, the valve 1 and the radiator to form a cold circulation loop, the P1 is used for providing cold circulation power for the cold circulation loop, and the valve 1 is used for controlling whether circulation medium of the cold circulation loop circulates or flows. Preferably, the electric drive system comprises a driving motor, an LE, a DCDC and an electric air conditioner, the valve 1 is a two-way valve, two valve ports of the valve 1 are respectively communicated with a radiator water inlet and an electric air conditioner water inlet, a water outlet of the electric air conditioner is communicated with the radiator water inlet, and the radiator is used for radiating heat of other parts of the electric drive system and determining whether to radiate heat of the electric air conditioner or not through control of the valve I.
The first heating circulation loop is added on the basis of the cold circulation loop, and the battery pack system of the whole vehicle can be heated through the heating circulation loop. The first heating circulation loop is formed by communicating the cold circulation loop branch inlet, P2, a valve 2, a heat exchanger and the cold circulation loop branch outlet. P2 is used to provide the circulation power for the first heating circulation loop, and the valve 2 is used to control whether the circulation medium of the first heating circulation loop circulates or flows.
In addition, the battery pack heating system further comprises a battery pack system internal circulation loop, and the battery pack system internal circulation loop is formed by communicating a battery pack system pipeline with the heat exchanger in the first heating circulation loop, wherein the battery pack system pipeline is a communication pipeline arranged around the battery pack system and used for heating battery packs and the like in the battery pack system.
Fig. 2 is a flowchart of an operation control of a cooling loop of an electric drive system of a battery pack heating system according to an embodiment of the present invention, and fig. 3 is a flowchart of an operation control of a first heating loop of the battery pack heating system according to an embodiment of the present invention. As shown in fig. 2, the operation control flow of the cooling cycle circuit of the electric drive system of the battery pack heating system provided by the embodiment of the invention can be performed as follows:
firstly, the cold circulation of the electric drive system is started, P1 is started, the valve 1 is led to the side of the radiator, then whether the electric air conditioner needs to be cooled or not is judged, if yes, the valve 1 is led to the side of the electric air conditioner, if not, the valve is returned to the previous step for circulation, and the process is finished.
As shown in fig. 3, the first heating cycle operation control flow of the battery pack heating system according to the embodiment of the present invention may be performed as follows:
firstly, normally starting the cold circulation of the electric drive system, wherein P2 is not started, the valve 2 is not conducted, namely, is in a closed state, then judging whether a battery pack of the battery pack system has a heating requirement, and if not, returning to the circulation of the previous step; if yes, further judging whether the whole vehicle operation is satisfied and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack, if not, returning to the circulation of the previous step, if yes, opening the valve 2, and ending the process.
The battery pack heating system for the pure electric vehicle solves the technical defect that the traditional battery pack air cooling technology for the pure electric vehicle cannot heat, and the battery pack system can be heated at low temperature by utilizing the simple heating circulation loop, so that the service performance of the battery pack is ensured, and the purpose of reasonably utilizing the whole vehicle energy is achieved and the resource waste is reduced because the heating source of the heating circulation loop comes from waste heat generated by the cold circulation loop of the original electric drive system of the whole vehicle.
Preferably, the battery pack system pipeline is formed by communicating a P3, a battery pack pipeline and a charger pipeline. The battery pack system pipeline surrounds a communication loop arranged on a battery pack, a charger and the like in the battery pack system, the circulating pump 3 is used for providing circulating power, the heated battery pack cooling liquid heats the battery pack in the circulating process, the circulating loop in the battery pack system is completed, and the circulating path is P3-battery pack-heat exchanger-charger-P3. The rate and uniformity of heating of the battery pack by the pack coolant in the pack system can be achieved by adjusting the P3 power.
Fig. 4 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention. Preferably, as shown in fig. 4, the battery pack heating system further comprises a second heating circulation loop, which is formed by communicating an electric heater, valves 3 and P4 and a heat exchanger of the first heating circulation loop. P4 is used for providing circulating power, and the circulation path is electric heater export-valve 3-P4-heat exchanger-electric heater entry, and the coolant liquid of electric heater heating is through the heat exchanger to battery package coolant liquid reheat, thereby battery package coolant liquid circulates in the battery package system and heats the battery package, and the purpose of setting like this is, outside first heating circulation loop, the second heating circulation loop that realizes heating through electric heater that increases again, can satisfy like this under the condition that electric drive system does not satisfy battery package heating condition or first heating circulation loop is to battery package heating inadequately, guarantee to the abundant and appropriate heating function of battery package.
Fig. 5 is a flowchart illustrating a second heating cycle operation control of the battery pack heating system according to an embodiment of the present invention. As shown in fig. 5, the second heating cycle operation control flow of the battery pack heating system according to the embodiment of the present invention may be performed as follows:
starting the heating function of the electric heater, wherein P4 is not started, the valve 3 is not conducted, then judging whether the electric heater needs to be heated, if not, returning to the previous step for circulation; if yes, the valve 3 is opened, the valve 3 is conducted, and the P4 is started until the end.
Fig. 6 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention, and in addition, preferably, as shown in fig. 6, an electric heater is communicated with valves 4, P5 and a warm air heat exchanger to form a warm air circulation loop, that is, the electric heater has another function of providing warm air for the whole vehicle in addition to satisfying the function of heating the battery pack. Furthermore, in the electric heater originally provided for providing warm air for the whole vehicle, another circulation loop, namely the second circulation loop, can be added, so that the battery pack can be heated in another way. Of course, if the electric heater is not provided in the whole vehicle, the electric heater and the corresponding heating circulation circuit may be added as needed. The arrangement mode in the battery pack heating system can further realize reasonable utilization of energy in the whole vehicle while ensuring the battery pack heating function
Preferably, the heat exchanger in the battery pack heating system provided by the embodiment of the invention adopts the double-channel heat exchanger, and is reasonably distributed according to the running state of the whole vehicle and the temperature condition of the battery pack, so that the battery pack cooling liquid can be heated by using two heat sources at the same time, and the battery pack cooling liquid can be heated by using one heat source alone, thereby being convenient for better realization and favorable control of the whole battery pack heating system. It should be noted that the dual-channel heat exchanger used in the embodiment of the present invention may be any dual-channel heat exchange device that may be implemented in the prior art, and the present invention is not limited thereto.
Fig. 7 is a schematic structural diagram of a battery pack heating system for a pure electric vehicle according to an embodiment of the present invention. Preferably, as shown in fig. 7, the above battery pack heating system further includes a balance tank device in communication with the electric drive system pipe, the first heating circulation loop, the second heating circulation loop, the warm air circulation loop, and/or the battery pack system internal circulation loop, the balance tank device being for performing an automatic compensation operation and an exhaust operation of the heat circulation medium or the circulation cooling liquid. It is also preferred that the thermal circulation medium or coolant employed throughout the system piping is a 50% water and 50% glycol mixture.
Preferably, the battery pack heat-removal system further comprises a control device electrically connected with all electric devices comprising the radiator, the heat exchanger, the P1, the P2, the valve 1 and the valve 2 in the system, and the control device is used for controlling the flow direction and the flow rate of the heat circulation medium in the pipeline of the whole system by controlling the electric devices. Preferably, the control device may be a vehicle control unit or may be provided in a vehicle control unit. It should be noted that, all valves and all circulating pumps adopted in the battery pack heating system according to the embodiment of the present invention may select different types of valves or pumps according to actual needs, so long as the valves can satisfy the functions of serving the embodiment of the present invention, for example, the valves may select two-way valves, etc., and in some cases, the number of valves is reduced, and at the same time, multichannel selection control is implemented.
Fig. 8 is a flowchart illustrating a heating operation control of the battery pack heating system according to an embodiment of the present invention. As shown in fig. 8, when the battery pack heating system integrates a plurality of circulation loops such as a first heating circulation loop, a second heating circulation loop, a circulation loop in the battery pack system, etc., as shown in fig. 8, the control flow of the heating operation of the battery pack heating system provided by the embodiment of the invention may be performed as follows:
a. starting a cold circulation loop of the electric drive system, wherein P2 and P4 are in a closed state, and the valve 2 and the valve 3 are in a non-conducting state;
b. p3, starting a preset low power;
c. b, monitoring and judging whether the battery pack system has a heating requirement in real time, if not, returning to the step b for circulation; if yes, further judging whether the temperature of the battery pack is lower than a preset limit value, if not, entering a step d 1; if yes, go to step d2, wherein,
d1, lifting P3 to preset middle power, judging whether the whole vehicle operation is satisfied and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, and if so, opening the valves 2 and P2; if not, opening the valve 3 and the P4;
d2, lifting P3 to preset high power, judging whether the whole vehicle operation is satisfied and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, and if so, opening valves 2, P2, 3 and P4; if not, the valves 3, P4 are opened.
It should be noted that, according to the heating requirement and the flow requirement of the circulating battery pack in the battery pack system, the purpose of adjusting the circulating flow can be achieved by adjusting the power of P3, where the preset low power, the preset medium power and the preset high power are defined for convenience of description, the preset high power has a higher power value than the preset medium power, the preset medium power has a higher power value than the preset low power, the specific power value can be determined according to the actual situation, and the specific way of adjusting the circulating flow by the above means is not limited to such classification or definition.
In addition to the battery pack heating system described in the foregoing embodiment, the embodiment of the present invention further provides a control method according to the battery pack heating system, and returning to fig. 3, where the control method includes the following steps:
starting a cold circulation loop of the electric drive system, wherein P2 is in a closed state, and the valve 2 is in a non-conducting state;
monitoring and judging whether the battery pack system has a heating requirement in real time, if not, keeping the states of the P2 and the valve 2 unchanged; if yes, further judging whether the whole vehicle operation is met and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, if yes, starting the valve 2 and the circulating pump 2, and if not, returning to the step of judging whether the battery pack system has heating requirements for circulating until the step is finished.
Preferably, referring again to fig. 8, the control method of the battery pack heating system according to the embodiment of the present invention includes the following steps:
a. starting a cold circulation loop of the electric drive system, wherein P2 and P4 are in a closed state, and the valve 2 and the valve 3 are in a non-conducting state;
b. p3, starting a preset low power;
c. b, monitoring and judging whether the battery pack system has a heating requirement in real time, if not, returning to the step b for circulation; if yes, further judging whether the temperature of the battery pack is lower than a preset limit value, if not, entering a step d 1; if yes, go to step d2, wherein,
d1, lifting P3 to preset middle power, judging whether the whole vehicle operation is satisfied and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, and if so, opening the valves 2 and P2; if not, opening the valves 3 and P4;
d2, lifting P3 to preset high power, judging whether the whole vehicle operation is satisfied and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, and if so, opening valves 2, P3 and P4; if not, the valves 3, P4 are opened.
It should be noted that, according to the heating requirement and the flow requirement of the circulating battery pack in the battery pack system, the purpose of adjusting the circulating flow can be achieved by adjusting the power of P3, where the preset low power, the preset medium power and the preset high power are defined for convenience of description, the preset high power has a higher power value than the preset medium power, the preset medium power has a higher power value than the preset low power, the specific power value can be determined according to the actual situation, and the specific way of adjusting the circulating flow by the above means is not limited to such classification or definition.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present invention, which is not described herein.
It should be noted that: the control method according to the battery pack heating system provided in the above embodiment belongs to the same concept as the battery pack heating system embodiment, and the specific implementation process is detailed in the system embodiment, which is not described herein again.
In summary, according to the battery pack heating system and the control method thereof provided by the embodiment of the invention, a new heating circulation loop is added outside the cold circulation loop of the electric drive system, the heating circulation loop is communicated with the battery pack system pipeline, and waste heat generated by the electric drive system is utilized to heat the battery pack, so that compared with the prior art, the following excellent technical effects are achieved:
1. the technical defect that the existing battery pack air cooling technology of the pure electric vehicle cannot heat is overcome through the heating circulation loop communicated with the electric drive system cooling circulation loop, the battery pack is effectively heated, the technical problems that the battery pack charge and discharge capacity is seriously attenuated and the power is insufficient and the efficiency is low when the whole vehicle runs at low temperature are solved, and therefore the low-temperature running performance and the efficiency of the whole vehicle are improved;
2. the waste heat generated by the operation of the electric drive system is used as a heat source to heat the battery pack, so that the whole vehicle energy is not consumed, and the good effects of reasonably utilizing the energy in the vehicle and saving the energy are achieved;
3. the battery pack can be effectively heated by only adding a heating circulation loop outside the cold circulation loop of the electric drive system, and the battery pack heating device has the advantages of simple structure, convenient operation and lower cost.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The control method of the battery pack heating system for the pure electric vehicle is characterized by comprising the battery pack heating system, wherein the battery pack heating system comprises the following components:
the electric driving system is used for providing driving force for the whole vehicle, and the electric driving system is communicated with the circulating pump I, the valve I and the radiator to form a cold circulating loop;
the first heating circulation loop is formed by communicating a cold circulation loop branch inlet, a circulation pump II, a valve II, a heat exchanger and a cold circulation loop branch outlet;
the internal circulation loop of the battery pack system is formed by communicating a battery pack system pipeline with the heat exchanger;
the battery pack heating system also comprises a second heating circulation loop, and the second heating circulation loop is formed by communicating an electric heater, a valve III, a circulating pump IV and the heat exchanger;
the electric heater is communicated with the valve IV, the circulating pump V and the warm air heat exchanger to form a warm air circulating loop so as to heat the battery pack system and provide warm air for the whole vehicle;
the battery pack system pipeline is formed by connecting a circulating pump III, a battery pack pipeline and a charger pipeline;
the control method comprises the following steps:
starting the cold circulation loop of the electric drive system, wherein the second circulation pump is in a closed state, and the second valve is in a non-conducting state;
monitoring and judging whether the battery pack system has a heating requirement in real time, if not, keeping the states of the circulating pump II and the valve II unchanged; if yes, further judging whether the whole vehicle operation is met and the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system, if yes, starting the valve II and the circulating pump II, and if no, returning to the step of judging whether the battery pack system has heating requirements for circulating until the step is finished;
wherein, the control method further comprises the following steps:
a. the cold circulation loop of the electric drive system is started, the second circulation pump and the fourth circulation pump are in a closed state, and the second valve and the third valve are in a non-conducting state;
b. starting the circulating pump three to preset low power;
c. b, monitoring and judging whether the battery pack system has a heating requirement in real time, if not, returning to the step b for circulation; if yes, further judging whether the temperature of the battery pack is lower than a preset limit value, if not, entering a step d 1; if yes, go to step d2, wherein,
d1, lifting the third circulating pump to preset middle power, judging whether the whole vehicle operation is met or not, and if so, opening the second valve and the second circulating pump, wherein the temperature of the cooling liquid of the electric drive system is higher than that of the battery pack system; if not, opening the valve III and the circulating pump IV;
d2, lifting the third circulating pump to a preset high power, judging whether the whole vehicle operation is met or not, and if so, starting the second valve, the second circulating pump, the third valve and the circulating pump, wherein the temperature of the cooling liquid of the electric drive system is higher than the temperature of the battery pack system; if not, opening the valve III and the circulating pump IV.
2. The method of claim 1, wherein the electric drive system comprises a drive motor, an LE, a DCDC and an electric air conditioner, the valve one is a two-way valve, two ports of the valve one are respectively communicated with the water inlet of the radiator and the water inlet of the electric air conditioner, and the water outlet of the electric air conditioner is communicated with the water inlet of the radiator.
3. The method of claim 1, wherein the heat exchanger is a two pass heat exchanger.
4. The method of claim 1, wherein the battery pack heating system further comprises a balancing tank apparatus in communication with the electric drive system piping, the first heating circulation loop, the second heating circulation loop, the warm air circulation loop, and/or the battery pack system internal circulation loop, the balancing tank apparatus being configured to perform an automatic compensation operation and an exhaust operation of the heat circulation medium.
5. The method of any one of claims 1 to 4, wherein the battery pack heating system further comprises a control device electrically connected to all electrical devices in the system including the radiator, the heat exchanger, the first circulation pump, the second circulation pump, the first valve and the second valve, the control device being configured to control the flow direction and the flow rate of the heat circulation medium in the whole system pipeline.
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| CN109103549A (en) * | 2018-08-02 | 2018-12-28 | 威马智慧出行科技（上海）有限公司 | A kind of batteries of electric automobile packet heating system and its heating means |
| CN110509786B (en) * | 2019-08-16 | 2021-12-03 | 浙江合众新能源汽车有限公司 | Electric automobile charging method, charging system and electric automobile |
| JP7307022B2 (en) * | 2020-03-27 | 2023-07-11 | トヨタ自動車株式会社 | Thermal management device |
| 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 |
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