CN114374025A - Method, device and system for controlling cooling medium and cooling liquid for cooling power battery - Google Patents
Method, device and system for controlling cooling medium and cooling liquid for cooling power battery Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 162
- 239000000110 cooling liquid Substances 0.000 title claims abstract description 158
- 239000002826 coolant Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000003507 refrigerant Substances 0.000 claims description 149
- 230000006835 compression Effects 0.000 claims description 57
- 238000007906 compression Methods 0.000 claims description 57
- 238000004781 supercooling Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 238000004590 computer program Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 10
- 239000000498 cooling water Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 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
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
- H01M10/6567—Liquids
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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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Abstract
The invention discloses a method, a device and a system for controlling a cooling medium and a cooling liquid for cooling a power battery. Compared with the prior art, the method has the advantages that in the process of maintaining the temperature of the power battery within a reasonable range, the efficiency of controlling the temperature of the power battery can be improved, and meanwhile, the energy consumption generated when the temperature of the power battery is controlled is reduced.
Description
Technical Field
The invention relates to the field of automobile energy, in particular to a method, a device and a system for controlling a coolant and a cooling liquid for cooling a power battery.
Background
Because the environmental pollution is increasingly serious, people pay more and more attention to energy conservation and emission reduction of vehicles, and the appearance of new energy automobiles can make up for the defect that fuel automobiles pollute the environment, so that the new energy automobiles have higher economic benefit. Different from the automobile which consumes petroleum as power, the new energy automobile achieves the beneficial effect of zero emission. The automobile mainly driven by electric power is a key development object in new energy automobiles, and mainly utilizes a power battery for functions. The common power battery has the advantages of high energy density, excellent performance, zero emission and the like, and the service life and the charge-discharge capacity of the power battery are influenced by temperature change in the using process. At present, pure electric vehicles are equipped with the lithium ion power automobile that maximizes, unitizes, and it can emit a large amount of heats when the operation, influences power battery's stability, needs one set of power battery cooling device to absorb the heat that power battery emitted this moment to reduce power battery's temperature, and guarantee power battery's work efficiency.
For a control method for cooling a power battery, the prior art includes: pengeai et al, in patent CN11150933A, propose a control method and device for cooling a power battery, and a power automobile, the invention starts a cooling system when the battery temperature is greater than a first preset value, reduces the cooling power of the cooling system when the battery temperature is less than a second preset value, and dynamically adjusts the cooling power of the cooling system according to the current battery temperature. However, the cooling of the power battery is limited to the adjustment of the cooling power by the method, the cooling system is not specifically adjusted, the energy consumption of the power battery cannot be reduced to the maximum extent, and frequent start-stop of the cooling system also causes the problem of shortened service life.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for controlling a cooling medium and cooling liquid for cooling a power battery, which are used for intelligently controlling the temperature of the power battery in real time and effectively prolonging the service life of a cooling device.
In order to solve the above problems, an embodiment of the present invention provides a method for controlling a coolant and a cooling liquid for cooling a power battery, including:
when the temperature of the power battery is higher than a preset temperature value, controlling a first refrigerant to cool the cooling liquid to obtain a second refrigerant;
performing compression operation on the second refrigerant to obtain a third refrigerant, and adjusting the compression power of the second refrigerant according to the calculated required power;
cooling the third refrigerant to obtain a fourth refrigerant, collecting supercooling degree data of the fourth refrigerant, and adjusting the cooling speed of the third refrigerant according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
As an improvement of the above scheme, the adjusting the compression power of the second refrigerant according to the calculated required power specifically includes:
comparing the required power obtained by calculation with the compression power of the second refrigerant in value;
if the required power is larger than the compression power, controlling the electronic compressor to increase the rotating speed so as to increase the compression power of the second refrigerant;
if the required power is smaller than the compression power, controlling the electronic compressor to reduce the rotating speed so as to reduce the compression power of the second refrigerant;
and if the required power is equal to the compression power, controlling the electronic compressor to maintain the rotating speed so as to maintain the compression power of the second refrigerant.
As an improvement of the above scheme, the required power obtained by the calculation specifically includes:
collecting flow data, specific heat capacity data and temperature difference data of the cooling liquid; the temperature difference data is obtained according to the data difference before and after cooling of the cooling liquid;
and calculating the required power according to the flow data, the specific heat capacity data and the temperature difference data of the cooling liquid.
As an improvement of the above scheme, after the controlling the first refrigerant to cool the cooling liquid to obtain the second refrigerant, the method further includes:
the superheat degree data of the second refrigerant are collected, and the superheat degree data are compared with a first preset value in numerical value;
if the superheat degree data is larger than the first preset value, controlling the electronic expansion valve to increase the opening degree so as to accelerate the circulation speed of the refrigerant;
if the superheat degree data is smaller than the first preset value, controlling the electronic expansion valve to reduce the opening degree so as to slow down the circulation speed of the refrigerant;
and if the superheat degree data is equal to the first preset value, controlling the electronic expansion valve to maintain the opening degree so as to maintain the circulation speed of the refrigerant.
As an improvement of the above scheme, the obtaining of the fourth refrigerant and the collection of the supercooling degree data of the fourth refrigerant, and the adjustment of the cooling speed of the third refrigerant according to the supercooling degree data specifically include:
comparing the supercooling degree data of the fourth refrigerant with a second preset value;
if the supercooling degree data is larger than the second preset value, controlling the electronic fan to reduce the rotating speed so as to reduce the cooling speed;
if the supercooling degree data is smaller than the second preset value, controlling the electronic fan to increase the rotating speed so as to increase the cooling speed;
and if the supercooling degree data is equal to the second preset value, controlling the electronic fan to maintain the rotating speed so as to maintain the cooling speed.
Correspondingly, the invention also provides a coolant control device for cooling the power battery, which comprises: the cooling liquid cools the first module, the refrigerant compression module and the refrigerant cooling module;
the cooling liquid cooling first module is used for controlling a first cooling medium to cool the cooling liquid to obtain a second cooling medium when the temperature of the power battery is higher than a preset temperature value;
the refrigerant compression module is used for performing compression operation on the second refrigerant to obtain a third refrigerant, and adjusting the compression power of the second refrigerant according to the calculated required power;
the refrigerant cooling module is used for cooling the third refrigerant to obtain a fourth refrigerant, collecting supercooling degree data of the fourth refrigerant and adjusting the cooling speed according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
Correspondingly, the invention also provides a cooling liquid control method for cooling the power battery, which comprises the following steps:
when the temperature of the power battery is higher than a preset temperature value, controlling a first cooling liquid to cool the power battery to obtain a second cooling liquid;
cooling the second cooling liquid through a refrigerant to obtain a third cooling liquid and temperature difference data before and after cooling of the cooling liquid; the third cooling liquid is used for cooling the power battery;
adjusting the circulation rate of the cooling liquid according to the temperature difference of the cooling liquid.
As an improvement of the above scheme, the adjusting the circulation speed of the cooling liquid according to the temperature difference of the cooling liquid specifically includes:
comparing the value of the temperature difference of the cooling liquid with a third preset value;
if the temperature difference is larger than a third preset value, controlling the electronic water pump to increase the rotating speed so as to accelerate the circulating speed of the cooling liquid;
if the temperature difference is smaller than a third preset value, controlling the electronic water pump to reduce the rotating speed so as to slow down the circulating speed of the cooling liquid;
and if the temperature difference is equal to a third preset value, controlling the electronic water pump to maintain the rotating speed so as to maintain the circulating speed of the cooling liquid.
Correspondingly, the invention also provides a cooling liquid control device for cooling the power battery, which comprises: the battery cooling module, the cooling liquid cooling second module and the cooling liquid circulating module;
the battery cooling module is used for controlling first cooling liquid to cool the power battery to obtain second cooling liquid when the temperature of the power battery is greater than a preset temperature value; wherein the temperature of the first cooling liquid is lower than the temperature of the second cooling liquid;
the cooling liquid cooling second module is used for cooling the second cooling liquid through a refrigerant to obtain a third cooling liquid and obtain temperature difference data before and after cooling of the cooling liquid; the third cooling liquid is used for cooling the power battery;
the cooling liquid circulating module is used for adjusting the circulating speed of the cooling liquid according to the temperature difference of the cooling liquid.
Correspondingly, the invention also provides a cooling medium and cooling liquid control system for cooling the power battery, which comprises: the system comprises a power battery, a cooling liquid control device for cooling the power battery and a cooling medium control device for cooling the power battery;
the power battery is connected with a cooling liquid control device for cooling the power battery, the cooling liquid control device for cooling the power battery is connected with a cooling medium control device for cooling the power battery, the cooling medium control device for cooling the power battery executes the cooling medium control method, and the cooling liquid control device for cooling the power battery executes the cooling liquid control method.
Therefore, the invention has the following beneficial effects:
the invention discloses a method, a device and a system for controlling a cooling medium and a cooling liquid for cooling a power battery. Compared with the prior art, the method has the advantages that in the process of maintaining the temperature of the power battery within a reasonable range, the efficiency of controlling the temperature of the power battery can be improved, and meanwhile, the energy consumption generated when the temperature of the power battery is controlled is reduced.
Drawings
Fig. 1 is a schematic flow chart illustrating a refrigerant control method for cooling a power battery according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a coolant control method for cooling a power battery according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a coolant control device for cooling a power battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a cooling liquid control device for cooling a power battery according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cooling medium and cooling liquid control system for cooling a power battery according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a topology of power battery cooled electrical devices according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a refrigerant control method for cooling a power battery according to an embodiment of the present invention, and as shown in fig. 1, the method includes steps 101 to 103, where each step specifically includes:
step 101: and when the temperature of the power battery is higher than the preset temperature value, controlling the first refrigerant to cool the cooling liquid to obtain a second refrigerant.
In this embodiment, step 101 specifically includes: when the temperature of the power battery is higher than a preset value, the battery starts a cooling mode, the cooling of the cooling liquid is realized in the miller through a cooling medium, and the cooling of the power battery is realized in the water cooling plate through the cooling liquid.
And (3) collecting superheat degree data of a second refrigerant, and comparing the superheat degree data with a first preset value: if the superheat degree data is larger than a first preset value, controlling the electronic expansion valve to increase the opening degree so as to accelerate the circulation speed of the refrigerant; if the superheat degree data is smaller than a first preset value, controlling the electronic expansion valve to reduce the opening degree so as to slow down the circulation speed of the refrigerant; and if the superheat degree data is equal to a first preset value, controlling the electronic expansion valve to maintain the opening degree so as to maintain the circulation speed of the refrigerant.
Preferably, the refrigerant temperature-pressure value of the second refrigerant is collected, and the superheat degree data is obtained by subtracting the saturation temperature corresponding to the second refrigerant pressure from the temperature of the second refrigerant.
Preferably, the first preset value may be set in a range of: 2-3 ℃.
Step 102: and performing compression operation on the second refrigerant to obtain a third refrigerant, and adjusting the compression power of the second refrigerant according to the calculated required power.
In this embodiment, step 102 specifically includes:
collecting flow data, specific heat capacity data and temperature difference data of cooling liquid; the temperature difference data is obtained according to the data difference before and after cooling of the cooling liquid; and calculating the required power according to the flow data, the specific heat capacity data and the temperature difference data of the cooling liquid.
Preferably, the flow data q and specific heat capacity data c of the cooling liquid and the temperature T of the cooling liquid when the cooling liquid flows out of the water cooling plate are collectedinAnd the temperature T of the cooling liquid when entering the water cooling plateoutAccording to the formula Q ═ Q × c × (T)in-Tout) And calculating to obtain the required power Q.
Comparing the calculated required power with the compression power of the second refrigerant by the numerical value: if the required power is larger than the compression power, controlling the electronic compressor to increase the rotating speed so as to increase the compression power of the second refrigerant; if the required power is smaller than the compression power, controlling the electronic compressor to reduce the rotating speed so as to reduce the compression power of the second refrigerant; and if the required power is equal to the compression power, controlling the electronic compressor to maintain the rotating speed so as to maintain the compression power of the second refrigerant.
Step 103: cooling the third refrigerant to obtain a fourth refrigerant, collecting supercooling degree data of the fourth refrigerant, and adjusting the cooling speed of the third refrigerant according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
In this embodiment, step 103 specifically includes: and comparing the supercooling degree data of the fourth refrigerant with a second preset value: if the supercooling degree data is larger than a second preset value, controlling the electronic fan to reduce the rotating speed so as to reduce the cooling speed; if the supercooling degree data is smaller than a second preset value, controlling the electronic fan to increase the rotating speed so as to increase the cooling speed; and if the supercooling degree data is equal to the second preset value, controlling the electronic fan to maintain the rotating speed so as to maintain the cooling speed.
Preferably, the refrigerant temperature-pressure value of the fourth refrigerant is collected, and the temperature of the fourth refrigerant is subtracted from the saturation temperature corresponding to the pressure of the fourth refrigerant to obtain the supercooling degree data.
Preferably, the first preset value may be set in a range of: 5-7 ℃.
Preferably, the electronic compressor, the electronic fan and the electronic expansion valve in steps 101 to 103 can be adjusted by using a PWM duty control valve, and the rotation speed of the four electronic devices can be adjusted according to the change of the PWM duty.
Preferably, the electronic compressor can also correspond to different rotating speeds according to the rotating speed-power MAP of the electronic compressor, and the rotating speed can also be confirmed if the numerical value of the refrigerating power is confirmed; after the rotating speed corresponding to the refrigerating power Q is inquired, a rotating speed request can be sent to the electronic compressor, so that the power regulation is realized.
Referring to fig. 2, fig. 2 is a schematic flow chart of a coolant control method for cooling a power battery according to an embodiment of the present invention, and as shown in fig. 2, the method includes steps 201 to 203, where each step is as follows:
step 201: and when the temperature of the power battery is higher than a preset temperature value, controlling the first cooling liquid to cool the power battery to obtain a second cooling liquid.
In this embodiment, step 201 specifically includes: when the temperature of the power battery is higher than the preset temperature value, the power battery starts a cooling mode, and the cooling liquid is controlled to cool the power battery and absorb the temperature of the power battery.
Step 202: cooling the second cooling liquid through a refrigerant to obtain a third cooling liquid and temperature difference data before and after cooling of the cooling liquid; wherein the third cooling liquid is used for cooling the power battery.
In this embodiment, step 202 specifically includes: and conveying the second cooling liquid to a giller for cooling, absorbing the heat of the second cooling liquid through a refrigerant in the giller for cooling, and calculating temperature difference data of the cooling liquid according to the temperature of the cooling liquid when the cooling liquid exits the giller and the temperature of the cooling liquid when the cooling liquid enters the giller.
Step 203: adjusting the circulation rate of the cooling liquid according to the temperature difference of the cooling liquid.
In this embodiment, step 203 specifically includes: and comparing the value with a third preset value according to the temperature difference of the cooling liquid: if the temperature difference is greater than a third preset value, controlling the electronic water pump to increase the rotating speed so as to accelerate the circulating speed of the cooling liquid; if the temperature difference is smaller than a third preset value, controlling the electronic water pump to reduce the rotating speed so as to slow down the circulating speed of the cooling liquid; and if the temperature difference is equal to a third preset value, controlling the electronic water pump to maintain the rotating speed so as to maintain the circulating speed of the cooling liquid.
Preferably, the temperature T of the cooling liquid exiting the chiller is determinedinAnd the temperature T of the cooling liquid when it enters the mulleroutCalculating the temperature difference T of the cooling liquidCThe formula is as follows: t isC＝Tin-Tout。
Preferably, the electronic water pump adjusts the rotation speed by a PWM duty control method.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a coolant control device for cooling a power battery according to an embodiment of the present invention, including: the coolant cools the first module 301, the refrigerant compression module 302, and the refrigerant cooling module 303.
The first cooling liquid cooling module 301 is configured to control the first cooling medium to cool the cooling liquid when the temperature of the power battery is greater than a preset temperature value, so as to obtain a second cooling medium.
The refrigerant compression module 302 is configured to perform compression operation on the second refrigerant to obtain a third refrigerant, and adjust compression power on the second refrigerant according to the calculated required power.
The refrigerant cooling module 303 is configured to perform a cooling operation on the third refrigerant to obtain a fourth refrigerant, acquire supercooling degree data of the fourth refrigerant, and adjust a cooling speed according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
Preferably, the refrigerant compression module 302 includes: the device comprises a compression power comparison unit, an increase compression power unit, a decrease compression power unit and a maintain compression power unit.
The compression power comparison unit is used for comparing the calculated required power with the compression power of the second refrigerant in numerical value.
The increased compression power unit is used for controlling the electronic compressor to increase the rotating speed if the required power is larger than the compression power so as to increase the compression power of the second refrigerant.
And the compression power reducing unit is used for controlling the electronic compressor to reduce the rotating speed if the required power is smaller than the compression power so as to reduce the compression power of the second refrigerant.
And the maintaining compression power unit is used for controlling the electronic compressor to maintain the rotating speed if the required power is equal to the compression power so as to maintain the compression power of the second refrigerant.
Preferably, the refrigerant cooling module 303 includes: the superheat degree data comparing unit, the opening degree increasing unit, the opening degree decreasing unit and the opening degree maintaining unit.
The superheat degree data comparison unit is used for acquiring superheat degree data of the second refrigerant and comparing the superheat degree data with a first preset value.
The opening increasing unit is used for controlling the electronic expansion valve to increase the opening if the superheat degree data is larger than a first preset value so as to accelerate the circulation speed of the refrigerant.
The opening reducing unit is used for controlling the electronic expansion valve to reduce the opening if the superheat degree data is smaller than a first preset value so as to slow down the circulation speed of the refrigerant.
The opening maintaining unit is used for controlling the electronic expansion valve to maintain the opening if the superheat degree data is equal to a first preset value so as to maintain the circulation speed of the refrigerant.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a cooling liquid control device for cooling a power battery according to an embodiment of the present invention, including: a battery cooling module 401, a coolant cooling second module 402, and a coolant circulation module 403.
The battery cooling module 401 is configured to control the first cooling liquid to cool the power battery to obtain a second cooling liquid when the temperature of the power battery is greater than a preset temperature value; wherein the temperature of the first cooling liquid is lower than the temperature of the second cooling liquid.
The cooling liquid cooling second module 402 is configured to cool the second cooling liquid by a cooling medium to obtain a third cooling liquid, and obtain temperature difference data before and after cooling the cooling liquid; and the third cooling liquid is used for cooling the power battery.
The cooling liquid circulation module 403 is used for adjusting the circulation speed of the cooling liquid according to the temperature difference of the cooling liquid.
Preferably, the cooling liquid circulation module 403 includes: the device comprises a temperature comparison unit, a rotating speed increasing unit, a rotating speed reducing unit and a rotating speed maintaining unit.
The temperature comparison unit is used for comparing the value of the temperature difference of the cooling liquid with a third preset value.
And the rotating speed increasing unit is used for controlling the electronic water pump to increase the rotating speed if the temperature difference is greater than a third preset value so as to accelerate the circulating speed of the cooling liquid.
And the rotating speed reducing unit is used for controlling the electronic water pump to reduce the rotating speed if the temperature difference is smaller than a third preset value so as to slow down the circulating speed of the cooling liquid.
And the rotating speed maintaining unit is used for controlling the electronic water pump to maintain the rotating speed if the temperature difference is equal to a third preset value so as to maintain the circulating speed of the cooling liquid.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a cooling medium and cooling medium control system for cooling a power battery according to an embodiment of the present invention, which includes a power battery 501, a cooling medium control device 502 for cooling the power battery, and a cooling medium control device 503 for cooling the power battery.
In the present embodiment, the power battery 501 and the power battery cooling coolant control device 502 are connected by a water cooling plate, and the power battery cooling coolant control device 503 and the power battery cooling coolant control device 502 are connected by a chiller.
Preferably, the power battery cooling coolant control device 502 comprises a water cooling plate, T1, T2 and an electric water pump; the water cooling plate is used in the place where the temperature of the battery pack is exchanged with the temperature of cooling liquid, so that the battery pack is cooled; t1 and T2 are temperature sensors, T1 for measuring the temperature of the cooling fluid as it exits the water-cooled plate, T2 for measuring the temperature of the cooling fluid as it enters the water-cooled plate; and the electronic water pump is used for realizing the circulation of the cooling liquid.
Preferably, the coolant control device 503 for cooling the power battery includes a chiller, PT1, PT2, an electronic compressor, a condenser, an electronic fan and an EXV; the cooler is used in the place where the temperature of the refrigerant is exchanged with the temperature of the cooling liquid, and the refrigerant expands and gasifies in the cooler to absorb heat so as to cool the cooling liquid; PT1 and PT2 are pressure-temperature sensors, PT1 is used for measuring the temperature of the refrigerant when the refrigerant exits the chiller, and PT2 is used for measuring the temperature of the refrigerant when the refrigerant enters the chiller; the electronic compressor is used for compressing low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant; the condenser is used for condensing the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant; the electronic fan is used for forcing air to flow, taking away heat of the refrigerant and realizing cooling of the refrigerant; and the EXV is an electronic expansion valve and is used for adjusting the opening degree, controlling the flow rate of the refrigerant and realizing the adjustment of the cooling power.
Fig. 6 is a schematic structural diagram of a power battery cooled electrical appliance topology according to an embodiment of the present invention, which includes T1, T2, PT1, PT2, BMS, TMS electronic compressor, EXV, electronic fan, water pump, and chiller.
In this embodiment, the battery cooling controller (TMS) calculates the battery cooling demand by reading the values of the temperature sensors (T1, T2), the values of the temperature-pressure sensors (PT1, PT2), and the value of the battery temperature in the battery management controller (BMS, not part of the device), and controls the electronic compressor, the electronic expansion valve (EXV), the electronic fan, the electronic water pump, and the chiller to cool the battery.
Preferably, a power battery cooling water circuit circulating system is formed by the electronic water pump, the temperature sensor T1, the temperature sensor T2 and the water cooling plate; a refrigerant circulating system is formed by the electronic expansion valve, the beller, the electronic compressor and the condenser.
Preferably, the cooling water is cooled by expanding and absorbing heat (gasifying) by a refrigerant in the chiller and exchanging heat with the cooling water; through the circulation low cooling water in the water-cooling plate below the battery pack, heat exchange is carried out with the battery pack, and the cooling of the battery pack is realized.
Preferably, 1 electronic water pump realizes the circulation of battery package cooling water, flows into refrigerating plant again with the cooling water of heat transfer intensification in the water-cooling board and cools down, has variable frequency speed governing function simultaneously to reduce water pump power consumption.
Preferably, 1 electronic compressor compresses low-temperature and low-pressure refrigerant gas to obtain high-temperature and high-pressure refrigerant gas, and the compressor has a variable-frequency speed regulation function to reduce power consumption of the compressor.
Preferably, the refrigerant gas is condensed into the refrigerant liquid by heat exchange with the high-temperature and high-pressure refrigerant gas by 1 condenser.
Preferably, the condenser is forcedly cooled by 1 electronic fan to realize cooling liquefaction of refrigerant gas, and the fan has a frequency conversion speed regulation function to reduce the power consumption of the fan; the electronic fan and the condenser carry out the liquefaction operation of the refrigerant gas together.
Preferably, the flow rate of the refrigerant entering the chiller is controlled by 1 electronic expansion valve, so as to realize the control of the gasification of the refrigerant, and the electronic expansion valve has an opening degree adjusting function, so as to ensure the efficiency of the gasification of the refrigerant.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention, as shown in fig. 7, specifically:
a terminal device of this embodiment includes: a processor 701, a memory 702, and a computer program stored in said memory 702 and executable on said processor 701. The processor 701 implements the steps of the coolant and coolant control method for cooling the power battery in the embodiment, for example, all the steps of the coolant control method for cooling the power battery shown in fig. 1, when executing the computer program. Alternatively, the processor, when executing the computer program, implements the functions of the modules in the device embodiments, for example: all modules of the coolant control device for cooling the power battery shown in fig. 2.
In addition, the embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for controlling cooling medium and cooling liquid for cooling a power battery according to any of the above embodiments.
It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine certain components, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 701 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. The general processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor 701 is a control center of the terminal device and connects various parts of the whole terminal device by using various interfaces and lines.
The memory 702 may be used to store the computer programs and/or modules, and the processor 701 may implement various functions of the terminal device by running or executing the computer programs and/or modules stored in the memory and calling data stored in the memory 702. The memory 702 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the terminal device integrated module/unit can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
Therefore, the invention provides a method, a device and a system for controlling cooling medium and cooling liquid for cooling a power battery, designs a set of low-energy-consumption cooling system for the power battery, and designs a scientific control method. The method respectively adjusts the working efficiency of the electronic water pump, the electronic compressor, the electronic fan and the electronic expansion valve, and can respond to the refrigerant state change data and the cooling liquid state change data so as to realize intelligent control of the temperature of the power battery. The service life of the power battery is prolonged, the safety of the battery is guaranteed, meanwhile, the energy consumption generated by system operation is reduced, and the power battery has the advantages of saving resources and protecting the environment.
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.
Claims (10)
1. A refrigerant control method for cooling a power battery is characterized by comprising the following steps:
when the temperature of the power battery is higher than a preset temperature value, controlling a first refrigerant to cool the cooling liquid to obtain a second refrigerant;
performing compression operation on the second refrigerant to obtain a third refrigerant, and adjusting the compression power of the second refrigerant according to the calculated required power;
cooling the third refrigerant to obtain a fourth refrigerant, collecting supercooling degree data of the fourth refrigerant, and adjusting the cooling speed of the third refrigerant according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
2. The cooling medium control method for cooling the power battery according to claim 1, wherein the adjusting of the compression power of the second cooling medium according to the calculated power demand specifically comprises:
comparing the required power obtained by calculation with the compression power of the second refrigerant in value;
if the required power is larger than the compression power, controlling the electronic compressor to increase the rotating speed so as to increase the compression power of the second refrigerant;
if the required power is smaller than the compression power, controlling the electronic compressor to reduce the rotating speed so as to reduce the compression power of the second refrigerant;
and if the required power is equal to the compression power, controlling the electronic compressor to maintain the rotating speed so as to maintain the compression power of the second refrigerant.
3. The cooling medium control method for cooling the power battery according to claim 2, wherein the required power obtained by calculation is specifically:
collecting flow data, specific heat capacity data and temperature difference data of the cooling liquid; the temperature difference data is obtained according to the data difference before and after cooling of the cooling liquid;
and calculating the required power according to the flow data, the specific heat capacity data and the temperature difference data of the cooling liquid.
4. The cooling medium control method for cooling the power battery according to claim 1, wherein after the controlling the first cooling medium to cool the cooling liquid and obtain the second cooling medium, the method further comprises:
the superheat degree data of the second refrigerant are collected, and the superheat degree data are compared with a first preset value in numerical value;
if the superheat degree data is larger than the first preset value, controlling the electronic expansion valve to increase the opening degree so as to accelerate the circulation speed of the refrigerant;
if the superheat degree data is smaller than the first preset value, controlling the electronic expansion valve to reduce the opening degree so as to slow down the circulation speed of the refrigerant;
and if the superheat degree data is equal to the first preset value, controlling the electronic expansion valve to maintain the opening degree so as to maintain the circulation speed of the refrigerant.
5. The cooling medium control method for cooling the power battery according to claim 1, wherein the obtaining of the fourth cooling medium and the collecting of the supercooling degree data of the fourth cooling medium and the adjusting of the cooling speed of the third cooling medium according to the supercooling degree data are specifically:
comparing the supercooling degree data of the fourth refrigerant with a second preset value;
if the supercooling degree data is larger than the second preset value, controlling the electronic fan to reduce the rotating speed so as to reduce the cooling speed;
if the supercooling degree data is smaller than the second preset value, controlling the electronic fan to increase the rotating speed so as to increase the cooling speed;
and if the supercooling degree data is equal to the second preset value, controlling the electronic fan to maintain the rotating speed so as to maintain the cooling speed.
6. A coolant control device for cooling a power battery is characterized by comprising: the cooling liquid cools the first module, the refrigerant compression module and the refrigerant cooling module;
the cooling liquid cooling first module is used for controlling a first cooling medium to cool the cooling liquid to obtain a second cooling medium when the temperature of the power battery is higher than a preset temperature value;
the refrigerant compression module is used for performing compression operation on the second refrigerant to obtain a third refrigerant, and adjusting the compression power of the second refrigerant according to the calculated required power;
the refrigerant cooling module is used for cooling the third refrigerant to obtain a fourth refrigerant, collecting supercooling degree data of the fourth refrigerant and adjusting the cooling speed according to the supercooling degree data; the fourth refrigerant is used for cooling the cooling liquid.
7. A cooling liquid control method for cooling a power battery is characterized by comprising the following steps:
when the temperature of the power battery is higher than a preset temperature value, controlling a first cooling liquid to cool the power battery to obtain a second cooling liquid;
cooling the second cooling liquid through a refrigerant to obtain a third cooling liquid and temperature difference data before and after cooling of the cooling liquid; the third cooling liquid is used for cooling the power battery;
adjusting the circulation rate of the cooling liquid according to the temperature difference of the cooling liquid.
8. The method for controlling cooling liquid for cooling power battery according to claim 7, wherein the circulation speed of cooling liquid is adjusted according to the temperature difference of cooling liquid, and specifically comprises:
comparing the value of the temperature difference of the cooling liquid with a third preset value;
if the temperature difference is larger than a third preset value, controlling the electronic water pump to increase the rotating speed so as to accelerate the circulating speed of the cooling liquid;
if the temperature difference is smaller than a third preset value, controlling the electronic water pump to reduce the rotating speed so as to slow down the circulating speed of the cooling liquid;
and if the temperature difference is equal to a third preset value, controlling the electronic water pump to maintain the rotating speed so as to maintain the circulating speed of the cooling liquid.
9. A power cell cooled coolant control apparatus, comprising: the battery cooling module, the cooling liquid cooling second module and the cooling liquid circulating module;
the battery cooling module is used for controlling first cooling liquid to cool the power battery to obtain second cooling liquid when the temperature of the power battery is greater than a preset temperature value; wherein the temperature of the first cooling liquid is lower than the temperature of the second cooling liquid;
the cooling liquid cooling second module is used for cooling the second cooling liquid through a refrigerant to obtain a third cooling liquid and obtain temperature difference data before and after cooling of the cooling liquid; the third cooling liquid is used for cooling the power battery;
the cooling liquid circulating module is used for adjusting the circulating speed of the cooling liquid according to the temperature difference of the cooling liquid.
10. A coolant and coolant control system for cooling a power battery, comprising: the system comprises a power battery, a cooling liquid control device for cooling the power battery and a cooling medium control device for cooling the power battery;
wherein the power battery is connected to a coolant control device for cooling the power battery, the coolant control device for cooling the power battery is connected to a coolant control device for cooling the power battery, wherein the coolant control device for cooling the power battery performs the coolant control method according to any one of claims 1 to 5, and the coolant control device for cooling the power battery performs the coolant control method according to any one of claims 7 or 8.
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