CN113895204A - Battery pack heat management system, vehicle and battery pack heat management method - Google Patents
Battery pack heat management system, vehicle and battery pack heat management method Download PDFInfo
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- CN113895204A CN113895204A CN202111180417.7A CN202111180417A CN113895204A CN 113895204 A CN113895204 A CN 113895204A CN 202111180417 A CN202111180417 A CN 202111180417A CN 113895204 A CN113895204 A CN 113895204A
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- 238000007726 management method Methods 0.000 title claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000004378 air conditioning Methods 0.000 claims abstract description 44
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 5
- 238000007669 thermal treatment Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00321—Heat exchangers for air-conditioning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- 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
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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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
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
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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
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a battery pack heat management system, a vehicle and a battery pack heat management method, wherein the battery pack heat management system comprises: a heat exchanger capable of exchanging heat with the battery pack; a first conduit in communication with a first end of the heat exchanger; a second conduit in communication with a second end of the heat exchanger; wherein the second end is opposite the first end; the two ends of the PTC heat treatment device are respectively communicated with the first pipeline and the second pipeline; and the heat pump air-conditioning system is respectively communicated with the first pipeline and the second pipeline and is connected with the PTC heat treatment device in parallel. By introducing the heat exchanger, the PCT heat treatment device and the heat pump air conditioning system, the PCT heat treatment device and/or the heat pump air conditioning system can be selected according to requirements to realize heat exchange of the battery pack through the heat exchanger.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a battery pack heat management system, a vehicle and a battery pack heat management method.
Background
In the development process of the thermal management system architecture of the vehicle, different thermal management schemes are adopted according to different cooling modes of the high-voltage battery pack.
At present, a heat management system of a battery pack mostly adopts a mode of introducing a radiator at the front end of the battery pack, so that the arrangement difficulty and cost are increased, meanwhile, the cooling efficiency is low, and the heat exchange requirement of the battery pack cannot be met.
Disclosure of Invention
The invention provides a battery pack thermal management system, a vehicle and a battery pack thermal management method.
In order to solve the technical problems, the invention adopts the following technical scheme:
a battery pack thermal management system according to an embodiment of a first aspect of the present invention includes:
a heat exchanger capable of exchanging heat with the battery pack;
a first conduit in communication with a first end of the heat exchanger;
a second conduit in communication with a second end of the heat exchanger; wherein the second end is opposite the first end;
the two ends of the PTC heat treatment device are respectively communicated with the first pipeline and the second pipeline;
and the heat pump air-conditioning system is respectively communicated with the first pipeline and the second pipeline and is connected with the PTC heat treatment device in parallel.
In some embodiments, the battery pack thermal management system further comprises: and the motor heat exchange system is connected with the PTC heat treatment device in parallel.
In some embodiments, the electric machine heat exchange system comprises:
a third pipeline, opposite ends of which are respectively communicated with the first pipeline and the second pipeline and are connected in parallel with the PTC heat treatment device;
and the motor is connected with the third pipeline and can contact with a heat transfer medium in the third pipeline for heat exchange.
In some embodiments, the battery pack thermal management system further comprises: and the engine heat exchange system is connected with the PTC heat treatment device in parallel.
In some embodiments, the engine heat exchange system comprises:
a fourth pipeline, opposite ends of which are respectively communicated with the first pipeline and the second pipeline and are connected in parallel with the PTC heat treatment device;
and the engine is connected with the fourth pipeline and can be in contact heat exchange with the heat transfer medium in the fourth pipeline.
In some embodiments, the heat pump air conditioning system comprises: the system comprises an internal heat exchanger, an expansion valve, a compressor, a four-way reversing valve, a gas-liquid separator and an external heat exchanger;
two ends of the internal heat exchanger are respectively communicated with the first pipeline and one end of the expansion valve and are positioned between the heat exchanger and the compressor;
the other end of the expansion valve is communicated with the second pipeline;
the four-way reversing valve is connected in series in the first pipeline and is positioned between the inner heat exchanger and the outer heat exchanger;
the compressor is communicated with the gas-liquid separator, and the compressor and the gas-liquid separator are respectively communicated with the four-way reversing valve;
and two ends of the external heat exchanger are respectively communicated with the first pipeline and the second pipeline.
A vehicle according to an embodiment of a second aspect of the invention includes:
a battery pack; and
in the battery pack thermal management system according to the embodiment of the second aspect, two ends of the heat exchanger in the battery pack thermal management system are respectively communicated with the battery pack.
In some embodiments, the vehicle is a hybrid vehicle.
A battery pack thermal management method according to an embodiment of a third aspect of the invention is applied to the vehicle of the embodiment of the second aspect, and includes:
acquiring the temperature of the battery pack;
if the temperature of the battery pack is lower than or equal to the lowest value of a preset temperature range, starting the PTC heat treatment device and/or the heat pump air conditioning system to heat the battery pack until the temperature of the battery pack is within the preset temperature range;
and if the temperature of the battery pack is greater than or equal to the highest value of a preset temperature range, starting the PTC heat treatment device and/or the heat pump air conditioning system to cool the battery pack until the temperature of the battery pack is within the preset temperature range.
In some embodiments, if the vehicle is in an electric operating mode, at least one of the motor heat exchange system, the PTC heat treatment device, and the heat pump air conditioning system is turned on;
and if the vehicle is in a non-electric working mode, starting at least one of the engine heat exchange system, the PTC heat treatment device and the heat pump air conditioning system.
The technical scheme of the invention has the following beneficial effects:
according to the battery pack heat management system provided by the embodiment of the invention, the heat exchanger, the PCT heat treatment device and the heat pump air conditioning system are introduced, so that the PCT heat treatment device and/or the heat pump air conditioning system can be selected as required to realize heat exchange on the battery pack through the heat exchanger. The heat exchange mode does not need to introduce a radiator at the front end of the battery pack, takes the advantages of a PCT heat treatment device and a heat pump air conditioning system into consideration, can be used alternatively or simultaneously, and can reduce power consumption on the basis of ensuring the heat exchange effect of the battery pack.
Drawings
Fig. 1 is a schematic diagram of a battery pack thermal management system according to an embodiment of the invention;
fig. 2 is a schematic diagram illustrating a mode of a thermal management operation of a battery pack thermal management system according to an embodiment of the present invention.
Reference numerals:
a first pipeline 10; a second conduit 20; a heat pump air conditioning system 30; an electronic three-way valve 40; a four-way selector valve 50; a fourth line 60; a third conduit 70; a driving space 80.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
A battery pack thermal management system according to an embodiment of the first aspect of the present invention will be described in detail below with reference to the drawings.
As shown in fig. 1, the battery pack thermal management system includes: a heat exchanger, a first pipeline 10, a second pipeline 20, a PTC heat treatment device and a heat pump air conditioning system 30.
Wherein the heat exchanger is capable of exchanging heat with the battery pack, the first conduit 10 is in communication with a first end of the heat exchanger, and the second conduit 20 is in communication with a second end of the heat exchanger; the second end is opposite the first end; both ends of the PTC heat treatment device are respectively communicated with the first pipeline 10 and the second pipeline 20; the heat pump air conditioning system 30 is respectively communicated with the first pipeline 10 and the second pipeline 20, and is connected in parallel with the PTC heat treatment device.
In the embodiment of the invention, the independent radiator of the battery pack is cancelled, and the heat exchange of the battery pack is completed by the battery cooler, so that the space for arranging the radiator is saved for the whole vehicle; aiming at the complex working condition mode of the hybrid vehicle, the heat management circulation mode is flexibly switched, so that the heat dissipation or heating requirement of the battery pack is guaranteed while the energy consumption is saved to the maximum extent. The PTC heat treatment device and the heat pump air conditioning system 30 can independently heat or cool a heat transfer medium, and the heat transfer medium can flow to the heat exchanger through the first pipe 10 and the second pipe 20, and heat or cool the battery pack through the heat exchanger. As shown in fig. 1, a heat transfer medium may be circulated between the heat exchanger and the PCT thermal treatment apparatus, and/or between the heat exchanger and a heat pump air conditioning system 30, via a first conduit 10, the heat exchanger, and a second conduit 20.
Heat transfer media include, but are not limited to, liquids or gases. For example: the heat transfer medium is water or air.
Generally, the heat pump air conditioning system 30 can provide suitable heat treatment effects at temperatures in the range of-10 ℃ to 10 ℃, even at-20 ℃. The PTC heat treatment device can meet the heating requirement in a temperature range below-10 ℃.
In the embodiment of the invention, the heat exchanger, the PCT heat treatment device and the heat pump air conditioning system 30 are introduced, so that the PCT heat treatment device and/or the heat pump air conditioning system 30 can be selected according to requirements to realize heat exchange on the battery pack through the heat exchanger. The heat exchange mode takes advantages of both the PCT heat treatment device and the heat pump air conditioning system 30 into consideration, can be used alternatively or simultaneously, and can reduce power consumption on the basis of ensuring the heat exchange effect of the battery pack.
In some embodiments, as shown in fig. 1, the heat pump air conditioning system 30 further comprises: the electronic three-way valve 40, at least the PCT thermal treatment device and the heat pump air conditioning system 30 are in communication with the first line 10 and/or the second line 20 via the electronic three-way valve 40.
The electronic three-way valve 40 can realize the accurate control of the valve opening, and the flow control precision of the heat transfer medium is improved, so that the heat transfer efficiency of the system is improved.
In some embodiments, the battery pack thermal management system further comprises: and the motor heat exchange system is connected with the PTC heat treatment device in parallel.
As shown in fig. 1, the heat exchange system of the motor not only can further enrich the heat treatment scheme, but also can recover the heat generated by the motor during working, fully utilizes the waste heat of the motor, is beneficial to saving energy and further reduces power consumption.
In practical application, the waste heat generated by the motor during working can be utilized to the maximum extent by the motor waste heat recovery structure, under the same condition and under the NEDC working condition, after the motor waste heat recovery is increased, the water inlet temperature of the battery is increased by about 10-20 ℃, and the accumulated endurance mileage is increased by about 10 km.
In some embodiments, the electric machine heat exchange system comprises: a third pipe 70 and a motor, wherein opposite ends of the third pipe 70 are respectively communicated with the first pipe 10 and the second pipe 20, and are connected in parallel with the PTC heat-treating device; the motor is connected with the third pipeline 70 and can contact with a heat transfer medium in the third pipeline 70 for heat exchange.
As shown in fig. 1, the heat generated by the motor is carried away by the heat transfer medium via the third line 70 and flows to the heat exchanger via the first line 10 or the second line 20.
Further, the motor heat exchange system also comprises a first power component for driving the heat transfer medium to flow. As shown in fig. 1, when the heat transfer medium is water, the first power unit is a water pump.
In some embodiments, the battery pack thermal management system further comprises: and the engine heat exchange system is connected with the PTC heat treatment device in parallel.
As shown in figure 1, the heat exchange system of the engine not only can further enrich the heat treatment scheme, but also can recover the heat generated by the engine during working, fully utilizes the waste heat of the engine, is beneficial to saving energy and further reduces the power consumption.
In some embodiments, the engine heat exchange system comprises: a fourth pipe 60 and an engine, wherein opposite ends of the fourth pipe 60 are respectively communicated with the first pipe 10 and the second pipe 20, and are connected in parallel with the PTC heat-treating device; the engine is connected with the fourth pipeline 60 and can contact with a heat transfer medium in the fourth pipeline 60 for heat exchange.
As shown in fig. 1, the heat generated by the engine is carried away by the heat transfer medium via the fourth conduit 60 and flows to the heat exchanger via the first conduit 10 or the second conduit 20.
Further, the engine heat exchange system also comprises a second power component for driving the heat transfer medium to flow. As shown in fig. 1, when the heat transfer medium is water, the second power unit is a water pump.
In some embodiments, the heat pump air conditioning system 30 includes: an internal heat exchanger, an expansion valve, a compressor, a four-way reversing valve 50, a gas-liquid separator and an external heat exchanger; both ends of the internal heat exchanger are respectively communicated with the first pipeline 10 and one end of the expansion valve, and are positioned between the heat exchanger and the compressor; the other end of the expansion valve is in communication with the second conduit 20; the four-way reversing valve 50 is connected in series in the first pipeline 10 and is positioned between the inner heat exchanger and the outer heat exchanger; the compressor is communicated with the gas-liquid separator, and the compressor and the gas-liquid separator are respectively communicated with the four-way reversing valve 50; both ends of the external heat exchanger are respectively communicated with the first pipeline 10 and the second pipeline 20.
As shown in fig. 1, the internal heat exchanger is communicated with the first pipe 10 through the electronic three-way valve 40.
The four-way reversing valve 50 can replace the functions of a refrigerating TXV valve and a heating TXV valve of a traditional heat pump air conditioner, and in addition, as the heat exchanger in the air conditioner can simultaneously play the functions of a condenser and an evaporator in the air conditioner, a main machine of the air conditioner can be directly borrowed, and the pipeline arrangement of the whole air conditioner is simpler.
The heat pump air conditioning system 30 includes a refrigeration cycle and a heating cycle. Specifically, the refrigeration cycle is that the electric compressor compresses a high-temperature low-pressure refrigerant (also called a heat transfer medium) into a high-temperature high-pressure liquid, the high-temperature high-pressure liquid flows to the heat exchanger outside the vehicle through the four-way reversing valve 50 to release heat, the refrigerant is cooled into a low-temperature high-pressure liquid, the low-temperature low-pressure liquid is changed into a low-temperature low-pressure mist state through the electronic expansion valve and is pushed into the heat exchanger inside the vehicle, and the refrigerant exchanges heat with the gas inside the vehicle, so that the temperature of the air inside the vehicle is reduced, and the refrigeration effect is achieved. The heating cycle is a complete heating cycle in which high-temperature and high-pressure liquid compressed by the electric compressor flows into the heat exchanger (condensation) in the vehicle through the four-way reversing valve 50 to release heat, so that the temperature in the vehicle is increased, the refrigerant is expanded into low-temperature and low-pressure fog through the electronic expansion valve after the temperature of the refrigerant is reduced, the fog is absorbed by heat exchange outside the vehicle to be converted into high-temperature and low-pressure gas, and the high-temperature and low-pressure gas flows back to the stroke of the electric compressor.
In one embodiment, the water-cooled PTC thermal treatment device is connected in parallel with a heat pump air conditioning circuit, the flow rate between the warm air core and the battery heat exchanger is controlled by an electronic three-way valve 40, and the motor is also connected in parallel in the circuit, and is generally used to assist in heating the battery pack under the condition that the temperature of the drive motor reaches a certain value and the temperature of the battery pack is still low. The engine is only inserted into the heating cycle of the battery pack under the working condition of starting the default engine in an HEV mode or a Sport mode, and the temperature of the water inlet of the battery pack is remarkably prevented from being rapidly increased due to the fact that the water temperature of the engine is rapidly increased, the requirement on the control precision of the electronic three-way valve 40 is high, the temperature of the water inlet of the battery pack is prevented from being rapidly increased due to overheating of the water of the engine, the performance of the battery pack is influenced, and if a water temperature sensor is externally connected to the water inlet of the battery pack, first-order or second-order filtering processing is generally carried out on the temperature signal of the water inlet of the battery pack to ensure that a temperature rise curve is as gentle as possible.
In the heating part of the battery pack, the invention introduces four major cycles of a heat pump air conditioning system 30, a PTC heat treatment device, a motor heat exchange system and an engine heat exchange system. Considering the optimal working efficiency range of the heat pump, as shown in fig. 2, the temperature of the battery pack is between-20 ℃ and-10 ℃ which is a mixed heating working condition, and both the heat pump and the PTC should be involved in working. The mode division of the thermal management working condition is shown in the following table.
Control strategy of battery pack cooling and heating cycle: the advancing and retreating conditions of the PTC heat treatment device and the heat pump air-conditioning system 30 are that when the heat pump air-conditioning system 30 can meet the heating requirement, the opening of the PTC heat treatment device is reduced; under the working condition that the temperature of the heat pump air conditioning system 30 is slowly increased, the PTC heat treatment device compensates the temperature increase; the heat pump air conditioning system 30 has poor energy consumption, and the PTC heat treatment device works, for example, at the temperature of more than 10 ℃ or below-20 ℃. The compressor control performs PID control according to a target temperature, limits the maximum rotation speed of the compressor, controls the rotation speed of the compressor with reference to suction/discharge pressure, pressure ratio and discharge temperature, and additionally requires a time interval to be set when the refrigeration/heating model is switched. Advancing and retreating conditions of the heat exchange system of the engine: the hybrid vehicle is generally defaulted to an EV (electric) mode in a starting stage, the engine does not work at the moment, and if the current ambient temperature is low and the battery pack has a heating requirement, a PTC (positive temperature coefficient) heat treatment device, a thermal air conditioning system or a heating mode of mixing the PTC heat treatment device and the thermal air conditioning system can be selected according to an ambient temperature interval; if the engine is started during the running of the vehicle, the battery pack can be heated by hot water of the engine by controlling the electronic three-way valve 40 preferentially in order to save the energy consumption of the whole vehicle. Starting conditions of the motor heat exchange system are as follows: when the temperature of the driving motor reaches a threshold value, the electronic three-way valve 40 can be controlled to assist in heating. The embodiment of the invention provides a novel heat management system structure of a hybrid vehicle model, which integrates a scheme of heating a battery pack by an engine heat exchange system, and meets the requirements of more severe heat management working conditions.
An embodiment of a second aspect of the invention provides a vehicle comprising: the battery pack comprises a battery pack and the battery pack heat management system of any one of the embodiments, wherein two ends of a heat exchanger in the battery pack heat management system are respectively communicated with the battery pack.
In practical applications, as shown in fig. 1, the internal heat exchanger and the expansion valve in the battery pack thermal management system may both be located within the driving space 80 of the vehicle. The remainder of the battery pack thermal management system may be located outside of the driving space 80. Such as a compressor, external heat exchanger, etc., may be located outside of the cab space 80.
Since the battery pack thermal management system according to the above-described embodiment of the invention has the above-described technical effects, the vehicle according to the embodiment of the invention also has the corresponding technical effect that by introducing the heat exchanger, the PCT thermal treatment device and the heat pump air conditioning system 30, the PCT thermal treatment device and/or the heat pump air conditioning system 30 can be selected as required to realize heat exchange with the battery pack through the heat exchanger. The heat exchange mode takes advantages of both the PCT heat treatment device and the heat pump air conditioning system 30 into consideration, can be used alternatively or simultaneously, and can reduce power consumption on the basis of ensuring the heat exchange effect of the battery pack.
In some embodiments, the vehicle is a hybrid vehicle.
The hybrid vehicle refers to a vehicle that can travel using both an electric mode and a fuel mode.
When the battery pack management system is applied to a hybrid vehicle, the heat dissipation requirements of the parts are analyzed and calculated, the heat dissipation and heating requirements of the parts can be met even under the worst working condition, and the vehicle is ensured to pass the three-high and off-road tests.
In a third aspect of the present invention, there is provided a battery pack thermal management method applied to the vehicle according to the second aspect, the battery pack thermal management method including:
step S110, acquiring the temperature of the battery pack;
step S120, if the temperature of the battery pack is lower than or equal to the lowest value of a preset temperature range, starting the PTC heat treatment device and/or the heat pump air conditioning system 30 to heat the battery pack until the temperature of the battery pack is within the preset temperature range;
step S130, if the temperature of the battery pack is larger than or equal to the highest value of a preset temperature range, the PTC heat treatment device and/or the heat pump air conditioning system 30 is started to cool the battery pack until the temperature of the battery pack is within the preset temperature range.
The preset temperature range may be, without limitation, 15 to 25 ℃.
Embodiments of the present invention further provide a readable storage medium, on which a program or instructions are stored, and when executed by a processor, the program or instructions implement the steps of the method according to any of the above embodiments. And the same technical effect can be achieved, and in order to avoid repetition, the description is omitted. The readable storage medium may be a computer readable storage medium, among others. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A battery pack thermal management system, comprising:
a heat exchanger capable of exchanging heat with the battery pack;
a first conduit in communication with a first end of the heat exchanger;
a second conduit in communication with a second end of the heat exchanger; wherein the second end is opposite the first end;
the two ends of the PTC heat treatment device are respectively communicated with the first pipeline and the second pipeline;
and the heat pump air-conditioning system is respectively communicated with the first pipeline and the second pipeline and is connected with the PTC heat treatment device in parallel.
2. The battery pack thermal management system of claim 1, further comprising: and the motor heat exchange system is connected with the PTC heat treatment device in parallel.
3. The battery pack thermal management system of claim 2, wherein the motor heat exchange system comprises:
a third pipeline, opposite ends of which are respectively communicated with the first pipeline and the second pipeline and are connected in parallel with the PTC heat treatment device;
and the motor is connected with the third pipeline and can contact with a heat transfer medium in the third pipeline for heat exchange.
4. The battery pack thermal management system of any of claims 1-3, further comprising: and the engine heat exchange system is connected with the PTC heat treatment device in parallel.
5. The battery pack thermal management system of claim 4, wherein the engine heat exchanging system comprises:
a fourth pipeline, opposite ends of which are respectively communicated with the first pipeline and the second pipeline and are connected in parallel with the PTC heat treatment device;
and the engine is connected with the fourth pipeline and can be in contact heat exchange with the heat transfer medium in the fourth pipeline.
6. The battery pack thermal management system of claim 1, wherein the heat pump air conditioning system comprises: the system comprises an internal heat exchanger, an expansion valve, a compressor, a four-way reversing valve, a gas-liquid separator and an external heat exchanger;
two ends of the internal heat exchanger are respectively communicated with the first pipeline and one end of the expansion valve and are positioned between the heat exchanger and the compressor;
the other end of the expansion valve is communicated with the second pipeline;
the four-way reversing valve is connected in series in the first pipeline and is positioned between the inner heat exchanger and the outer heat exchanger;
the compressor is communicated with the gas-liquid separator, and the compressor and the gas-liquid separator are respectively communicated with the four-way reversing valve;
and two ends of the external heat exchanger are respectively communicated with the first pipeline and the second pipeline.
7. A vehicle, characterized in that the vehicle comprises:
a battery pack; and
the battery pack heat management system of any of claims 1 to 6, wherein both ends of the heat exchanger in the battery pack heat management system are respectively in communication with the battery pack.
8. The vehicle of claim 7, characterized in that the vehicle is a hybrid vehicle.
9. A battery pack thermal management method applied to the vehicle according to any one of claims 7 or 8, comprising:
acquiring the temperature of the battery pack;
if the temperature of the battery pack is lower than or equal to the lowest value of a preset temperature range, starting a PTC heat treatment device and/or a heat pump air conditioning system to heat the battery pack until the temperature of the battery pack is within the preset temperature range;
and if the temperature of the battery pack is greater than or equal to the highest value of a preset temperature range, starting the PTC heat treatment device and/or the heat pump air conditioning system to cool the battery pack until the temperature of the battery pack is within the preset temperature range.
10. The battery pack thermal management method according to claim 9,
if the vehicle is in an electric working mode, at least one of a motor heat exchange system, the PTC heat treatment device and the heat pump air conditioning system is started;
and if the vehicle is in a non-electric working mode, starting at least one of an engine heat exchange system, the PTC heat treatment device and the heat pump air conditioning system.
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