CN112467246A - Battery cooling system and battery cooling control method - Google Patents
Battery cooling system and battery cooling control method Download PDFInfo
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- CN112467246A CN112467246A CN202011344463.1A CN202011344463A CN112467246A CN 112467246 A CN112467246 A CN 112467246A CN 202011344463 A CN202011344463 A CN 202011344463A CN 112467246 A CN112467246 A CN 112467246A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- 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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- 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
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- 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
Abstract
The invention discloses a battery cooling system and a battery cooling control method. The refrigeration circuit is filled with refrigerant. The cooling member is provided on the battery. A throttle valve is provided between the first outlet and the second inlet for regulating the flow of refrigerant into the cooling member. An observation member is provided between the throttle valve and the second inlet port, the observation member being for observing a state of the refrigerant flowing out of the throttle valve. The HVAC component is used to cool the passenger compartment. The thermostatic expansion valve is arranged between the first outlet and the third inlet, and is configured to cut off a flow passage between the first outlet and the third inlet when the temperature of the passenger compartment is lower than a preset value. The battery cooling system can improve the cooling efficiency of the battery and has higher safety.
Description
Technical Field
The invention relates to the technical field of battery cooling, in particular to a battery cooling system and a battery cooling control method.
Background
When an electric vehicle and a hybrid vehicle run, a power battery releases a large amount of heat, and in order to maintain the temperature of the power battery within a reasonable temperature range, the power battery needs to be cooled. The liquid cooling plate in the battery package lets in the coolant liquid usually among the prior art, and the cooling effect can be played to the battery to the coolant liquid that flows, and the coolant liquid after the intensification is with the heat effluvium through middle heat exchanger, and its cooling efficiency is lower, and there is the leakage risk in the coolant liquid in the battery package simultaneously, makes the operational safety nature of battery package lower.
Disclosure of Invention
An object of the present invention is to provide a battery cooling system capable of improving the cooling efficiency of a battery and having high safety.
Another object of the present invention is to provide a battery cooling control method, which can achieve efficient cooling of a battery and improve the operational stability and reliability of a battery cooling system.
In order to achieve the technical effects, the technical scheme of the battery cooling system and the battery cooling control method is as follows:
a battery cooling system for cooling a battery, comprising: a refrigeration circuit having a refrigerant passing therethrough, the refrigeration circuit having a first inlet and a first outlet; a cooling member having a second inlet and a second outlet, the second inlet in communication with the first outlet, the second outlet in communication with the first inlet, the cooling member being disposed on the battery; a throttle valve provided between the first outlet port and the second inlet port, the throttle valve being for adjusting a flow rate of the refrigerant into the cooling member; an observation member provided between the throttle valve and the second inlet port, the observation member being for observing a state of the refrigerant flowing out of the throttle valve; an HVAC assembly having a third inlet in communication with the first outlet and a third outlet in communication with the first inlet, the HVAC assembly for cooling a passenger compartment; a thermostatic expansion valve with a cut-off function, the thermostatic expansion valve being provided between the first outlet and the third inlet, the thermostatic expansion valve being configured to cut off a flow passage between the first outlet and the third inlet when a temperature of the passenger compartment is lower than a preset value; a controller configured to control a cooling power of the refrigeration circuit, a switch of the thermostatic expansion valve, an opening degree of the throttle valve, an output power of the HVAC component, and an output power of the battery.
Further, the refrigeration circuit comprises: a compressor, the first inlet in communication with the compressor; one end of the condenser is communicated with the compressor, and the other end of the condenser is communicated with the first outlet; wherein: the controller is configured to adjust a rotational speed of the compressor according to a temperature of the battery.
Further, the refrigeration circuit further comprises: the first detection piece is arranged between the compressor and the condenser and used for detecting the temperature and the pressure of the refrigerant; a second detection member provided between the condenser and the first outlet, the second detection member being for detecting a temperature and a pressure of the refrigerant; wherein: the controller is configured to adjust the opening degree of the throttle valve and the rotational speed of the compressor according to the temperature and pressure of the refrigerant detected by the first and second detecting members.
Further, the refrigeration power of the refrigeration circuit increases as the rotational speed of the compressor increases.
Further, the refrigeration circuit further comprises a liquid-gas separating member, the liquid-gas separating member is arranged between the compressor and the first inlet, and the liquid-gas separating member is used for separating the liquid refrigerant and the gaseous refrigerant and enabling the gaseous refrigerant to enter the compressor.
Further, the battery cooling system further includes a third detection member between the second outlet and the liquid-gas separation member, the third detection member being configured to detect a temperature of the refrigerant and a pressure of the refrigerant, and the controller is configured to adjust the opening degree of the throttle valve and the rotational speed of the compressor in accordance with the temperature and the pressure of the refrigerant detected by the third detection member.
Further, the refrigeration circuit further comprises a high-pressure filling valve and a low-pressure filling valve, the high-pressure filling valve is arranged between the first outlet and the third inlet, and the low-pressure filling valve is arranged between the third outlet and the first inlet.
A battery cooling control method that employs the battery cooling system described above, comprising: s1, detecting the temperature of the battery and the temperature of the passenger compartment, wherein the temperature of the battery is recorded as Tbat, the temperature of the passenger compartment is recorded as Tcabin, a first preset temperature value is recorded as Ta, a second preset temperature value is recorded as Tb, a third preset temperature value is recorded as Tc, and a fourth preset temperature value is recorded as Tset; s2, if the Tbat is larger than the Ta, adjusting the throttle valve to a first opening degree, if the Tcabin is larger than the Tset, opening the thermal expansion valve, if the Tbat is larger than the Ta or the Tcabin is larger than the Tset, opening and adjusting the refrigerating power of the refrigerating circuit to a first power; s3, detecting the Tbat and the Tcabin; s4, if Ta < the Tbat < the Tb and/or the Tcabin > the Tset, adjusting the opening degree of the throttle valve to a second opening degree, and/or adjusting the refrigerating power of the refrigerating circuit to a second power, wherein the second power is larger than the first power, and the second opening degree is larger than the first opening degree; if Tcabin is less than Tset, the thermal expansion valve is cut off, and step S3 is repeated; if the Tbat < the Ta, repeating step S1; adjusting the opening degree of the throttle valve to a third opening degree and adjusting the cooling power of the cooling circuit to a third power, the third power being greater than the second power, the third opening degree being greater than the second opening degree, if Tb < Tbat < Tc, and repeating step S3; and if the Tc is less than the Tbat, the controller controls the battery to stop charging and discharging.
Further, the Ta is 33-37 ℃, the Tb is 43-47 ℃, and the Tc is 53-57 ℃.
Further, the first opening degree is 20% -40%, the second opening degree is 50% -70%, and the third opening degree is 80% -100%; the controller controls the refrigeration power of the refrigeration loop by adjusting the rotating speed of a compressor in the refrigeration loop, the refrigeration power of the refrigeration loop is at the first power, the rotating speed of the compressor is 1500r/min-2500r/min, the refrigeration power of the refrigeration loop is at the second power, the rotating speed of the compressor is 3500r/min-4500r/min, and the rotating speed of the compressor is 5500r/min-6500r/min when the refrigeration power of the refrigeration loop is at the third power.
The invention has the following beneficial effects: according to the battery cooling system, the thermal expansion valve with the cut-off function can cut off the movement of the refrigerant towards the HAVC component, the single cooling function of the battery is realized, the cooling effect of the battery is improved, the controller can control the throttle valve to adjust the flow of the refrigerant according to the real-time temperature of the passenger compartment and the battery, and can control the refrigeration power, the output power of the HVAC component and the output power of the battery, so that the temperature reduction of the passenger compartment is ensured, the uniform and efficient cooling effect of the battery can be realized, the influence on a cooling loop can be reduced, and meanwhile, the refrigerant is in a gaseous state under atmospheric pressure and has higher safety.
The invention has the following beneficial effects: according to the battery cooling control method, the opening or the cutoff of the thermal expansion valve can be determined according to the actual temperature of the passenger compartment and the battery so as to ensure the cooling effect of the passenger compartment and the battery, meanwhile, different opening degrees of the throttle valve and different cooling powers of the refrigeration loop can be determined according to the real-time temperature of the battery, the cooling efficiency of the battery and the passenger compartment can be ensured, and system oscillation occurring when the battery cooling system adjusts the temperature of the battery and the passenger compartment can be reduced so as to enable the battery cooling system to be in a stable and reliable operation state.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a battery cooling system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a battery cooling control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a controller according to an embodiment of the present invention.
Reference numerals
11. A first inlet; 12. a first outlet; 13. a compressor; 14. a condenser; 15. a first detecting member; 16. a second detecting member; 17. a liquid-gas separation member; 18. a high pressure fill valve; 19. a low pressure fill valve;
2. a cooling member; 21. a second inlet; 22. a second outlet; 3. a throttle valve; 4. an observation member;
5. an HVAC component; 51. a third inlet; 52. a third outlet;
6. a thermostatic expansion valve; 7. a third detecting member; 8. a battery.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The specific structure of the battery cooling system of the embodiment of the present invention is described below with reference to fig. 1 to 3.
As shown in fig. 1-3, fig. 1 discloses a battery cooling system for cooling a battery, which includes a refrigeration circuit, a cooling member 2, a throttle valve 3, a viewing member 4, an HVAC assembly 5, a thermal expansion valve 6 with a shut-off function, and a controller. The refrigeration circuit is fed with a refrigerant and has a first inlet 11 and a first outlet 12. The cooling member 2 has a second inlet 21 and a second outlet 22, the second inlet 21 communicating with the first outlet 12, the second outlet 22 communicating with the first inlet 11, and the cooling member 2 is provided on the battery 8. A throttle 3 is provided between the first outlet 12 and the second inlet 21, the throttle 3 being used to adjust the flow of refrigerant into the cooling element 2. An observation member 4 is provided between the throttle valve 3 and the second inlet port 21, the observation member 4 being for observing the state of the refrigerant flowing out of the throttle valve 3. The HVAC assembly 5 has a third inlet 51 and a third outlet 52, the third inlet 51 communicating with the first outlet 12 and the third outlet 52 communicating with the first inlet 11, the HVAC assembly 5 being for cooling the passenger compartment. A thermostatic expansion valve 6 is provided between the first outlet 12 and the third inlet 51, the thermostatic expansion valve 6 being configured to close a flow passage between the first outlet 12 and the third inlet 51 when the temperature of the passenger compartment is below a preset value. The controller is configured to control the cooling power of the refrigeration circuit, the opening and closing of the thermostatic expansion valve 6, the opening degree of the throttle valve 3, the output power of the HVAC component 5, and the output power of the battery 8.
It will be appreciated that the refrigerant can be cooled in the refrigerating circuit and passed into the HAVC module and/or the cooling element 2 to reduce the temperature of the passenger compartment and the battery 8 and again into the refrigerating circuit for cooling, so that the battery cooling system can achieve a cooling effect of the battery 8 and the passenger compartment in a stable and reliable manner. The thermal expansion valve 6 with the stopping function can cut off the refrigerant flowing into the HAVC component, so that the refrigerant only enters the cooling part 2 and cools the battery 8, and the single cooling function of the battery 8 is realized. The controller can control the opening degree of the throttle valve 3 to control the flow of the refrigerant entering the cooling part 2, so that the cooling effect of the battery 8 can be guaranteed, the temperature of the battery 8 is effectively controlled within an acceptable range, the system oscillation of the whole battery cooling system can be reduced, the stable and reliable operation of the battery cooling system is guaranteed, and the service life of the battery cooling system is prolonged. The observation member 4 can observe the state of the refrigerant passing through the throttle valve 3 and going into the cooling member 2 to ensure that a proper two-phase refrigerant enters the cooling member 2. The cooling member 2 is directly arranged on the battery 8, so that the heat exchange between the refrigerant and the battery 8 can be realized conveniently, and the cooling effect of the battery 8 is improved. In addition, since the cooling member 2 exchanges heat with the battery 8 by the refrigerant flowing through the inside thereof, the boiling heat exchange coefficient of the battery 8 can be effectively increased. Meanwhile, even if the cooling element 2 has a refrigerant leakage phenomenon, the refrigerant is converted into a gaseous state under normal atmospheric pressure, so that the safety risk of causing short circuit of the battery 8 is avoided, and the safety is high. The controller can control the refrigerating power of the refrigerating circuit, the opening and closing of the thermal expansion valve 6, the opening degree of the throttle valve 3, the output power of the HVAC assembly 5 and the output power of the battery 8 according to the actual temperatures of the passenger compartment and the battery 8, not only can realize the reliable temperature control of the passenger compartment and the battery 8, but also can reduce the influence of the cooling of the battery 8 on the refrigerating circuit and can prolong the service life of the battery cooling system.
According to the battery cooling system of the embodiment, the thermal expansion valve 6 with the cut-off function can cut off the movement of the refrigerant towards the HAVC component, the single cooling function of the battery 8 is realized, the cooling effect of the battery 8 is improved, the controller can control the throttle valve 3 to adjust the flow of the refrigerant according to the real-time temperature of the passenger compartment and the battery 8, the refrigeration power, the output power of the HVAC component 5 and the output power of the battery 8 can be controlled, the temperature reduction of the passenger compartment is guaranteed, the uniform and efficient cooling effect of the battery 8 can be realized, the influence on a cooling loop can be reduced, and meanwhile, the refrigerant is in a gaseous state under the atmospheric pressure and has high safety.
In some embodiments, as shown in fig. 1, the refrigeration circuit includes a compressor 13 and a condenser 14. The first inlet 11 communicates with a compressor 13. The condenser 14 has one end communicating with the compressor 13 and the other end communicating with the first outlet 12. Wherein the controller is configured to adjust the rotational speed of the compressor 13 in accordance with the temperature of the battery 8.
It can be understood that the controller can adjust the rotating speed of the compressor 13 according to the real-time temperature of the battery 8, so that the refrigerating power of the refrigerating circuit can be adjusted according to the temperature of the battery 8, the cooling effect of the battery 8 can be ensured, and the influence of the cooling of the battery 8 on the refrigerating circuit can be reduced.
In some embodiments, as shown in fig. 1, the refrigeration circuit further comprises a first detection member 15 and a second detection member 16. The first detecting member 15 is provided between the compressor 13 and the condenser 14, and the first detecting member 15 detects the temperature and pressure of the refrigerant. The second sensing member 16 is disposed between the condenser 14 and the first outlet 12, and the second sensing member 16 is used to sense the temperature and pressure of the refrigerant. Wherein the controller is configured to adjust the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 according to the temperature and pressure of the refrigerant detected by the first and second detecting members 15 and 16.
It can be understood that, since the controller is set to a fixed value when controlling the opening degree of the throttle valve 3 and the rotation speed of the compressor 13, it will be difficult to meet the refrigeration requirements of the battery 8 and the passenger compartment in most cases, by inputting the pressure and temperature of the refrigerant between the compressor 13 and the condenser 14, and the pressure and temperature of the refrigerant between the condenser 14 and the first outlet 12 into the controller, the controller can obtain more accurate values of the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 through calculation, thereby ensuring that both the battery 8 and the passenger compartment can be reliably cooled, and the influence of the adjustment of the opening degree of the throttle valve 3 and the adjustment of the rotation speed of the compressor 13 on the entire battery cooling system can be effectively reduced, and ensuring the long-term reliable operation of the battery cooling system.
In some embodiments, the refrigeration power of the refrigeration circuit increases with increasing rotational speed of the compressor 13.
In some embodiments, as shown in fig. 1, the refrigeration circuit further comprises a liquid-gas separator 17, the liquid-gas separator 17 being arranged between the compressor 13 and the first inlet 11, the liquid-gas separator 17 being configured to separate the liquid refrigerant and the gaseous refrigerant and to introduce the gaseous refrigerant into the compressor 13.
It can be understood that the liquid-gas separating member 17 can ensure that the gaseous refrigerant enters the compressor 13 to prevent the liquid refrigerant from liquid hammering when entering the compressor 13, and further damage the compressor 13, thereby ensuring the cooling effect of the refrigerant in the refrigeration circuit, ensuring the cooling effect of the refrigerant output from the first outlet 12 on the battery 8 and the passenger compartment, ensuring the normal and safe operation of the refrigeration circuit, and improving the service life and the use safety of the battery cooling system.
In some embodiments, as shown in fig. 1, the battery cooling system further includes a third detection member 7, the third detection member 7 is located between the second outlet 22 and the liquid-gas separation member 17, the third detection member 7 is used for detecting the temperature of the refrigerant and the pressure of the refrigerant, and the controller is configured to adjust the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 according to the temperature and the pressure of the refrigerant detected by the third detection member 7.
It is understood that the controller can calculate the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 to meet the current cooling demand of the battery 8 and the passenger compartment more accurately after acquiring the temperature and the pressure of the refrigerant between the second outlet 22 and the liquid-gas separator 17, thereby further improving the control accuracy of the battery cooling system and improving the cooling effect of the passenger compartment and the battery 8.
In some embodiments, as shown in fig. 1, the refrigeration circuit further comprises a high-pressure charge valve 18 and a low-pressure charge valve 19, the high-pressure charge valve 18 being arranged between the first outlet 12 and the third inlet 51, the low-pressure charge valve 19 being arranged between the third outlet 52 and the first inlet 11.
As shown in fig. 2, the present invention also discloses a battery cooling control method, wherein the battery cooling control method adopts the battery cooling system described above, and the battery cooling control method includes: s1, detecting the temperature of the battery 8 and the temperature of the passenger compartment, wherein the temperature of the battery 8 is recorded as Tbat, the temperature of the passenger compartment is recorded as Tcabin, a first preset temperature value is recorded as Ta, a second preset temperature value is recorded as Tb, a third preset temperature value is recorded as Tc, and a fourth preset temperature value is recorded as Tset; s2, if Tbat is larger than Ta, the throttle valve 3 is adjusted to a first opening degree, if Tcabin is larger than Tset, the thermostatic expansion valve 6 is opened, if Tbat is larger than Ta or Tcabin is larger than Tset, and the refrigerating power of the refrigerating circuit is adjusted to a first power; s3, detecting Tbat and Tcabin; s4, if Ta < Tbat < Tb and/or Tcabin > Tset, adjusting the opening degree of the throttle valve 3 to a second opening degree, and/or adjusting the refrigerating power of the refrigerating circuit to a second power, wherein the second power is larger than the first power, and the second opening degree is larger than the first opening degree; if Tcabin is less than Tset, the thermostatic expansion valve 6 is closed, and the step S3 is repeated; if Tbat < Ta, repeating step S1; if Tb < Tbat < Tc, adjusting the opening degree of the throttle valve 3 to a third opening degree, and adjusting the cooling power of the refrigeration circuit to a third power, the third power being greater than the second power, the third opening degree being greater than the second opening degree, and repeating step S3; if Tc < Tbat, the controller controls the battery 8 to stop charging and discharging.
It can be understood that, at the beginning of the battery cooling control method, the battery cooling control method can firstly perform the first minor adjustment on the opening degree of the throttle valve 3 and the cooling power of the cooling circuit according to Tbat and Tcabin in steps S1 and S2, which not only can ensure the cooling effect on the battery 8 and the passenger compartment, but also can prevent the problems of system oscillation and energy waste of the battery cooling system caused by the overlarge adjustment range after the first detection, and meanwhile, can also determine whether the thermal expansion valve 6 needs to be turned off according to the actual temperature of Tcabin, thereby further improving the cooling effect and cooling efficiency on the battery 8. Secondly, step S3 can detect the temperature of the passenger compartment and the temperature of the battery 8 after the opening of the throttle valve 3 and the refrigeration power of the refrigeration circuit are adjusted for the first time to determine whether the adjustment needs to be continued, the controller can respectively adjust the opening of the throttle valve 3 to the second opening or the third opening according to the detected temperature data, and adjust the refrigeration power of the refrigeration circuit to the second power and the third power, and the controller adjusts the throttle valve 3 and the refrigeration circuit in a segmented manner, which can be beneficial to the stable change of the whole battery cooling system, and can ensure that the battery 8 and the passenger compartment can be cooled reliably and quickly in time. Meanwhile, when Tc is less than Tbat, the controller can control the battery 8 to stop charging and discharging, so that accidents caused by overhigh temperature of the battery 8 are prevented, and the safe operation of the battery 8 is ensured.
According to the battery cooling control method provided by the embodiment of the invention, the opening or the cutoff of the thermal expansion valve 6 can be determined according to the actual temperature of the passenger compartment and the battery 8 so as to ensure the cooling effect of the passenger compartment and the battery 8, and meanwhile, different opening degrees of the throttle valve 3 and different cooling powers of the refrigeration circuit can be determined according to the real-time temperature of the battery 8, so that the cooling efficiency of the battery 8 and the passenger compartment can be ensured, and the system oscillation of the battery cooling system during the temperature adjustment of the battery 8 and the passenger compartment can be reduced so as to enable the battery cooling system to be in a stable and reliable running state.
In some embodiments, Ta is from 33 ℃ to 37 ℃, Tb is from 43 ℃ to 47 ℃, and Tc is from 53 ℃ to 57 ℃.
It can be understood that when the temperature of the battery 8 is in different temperature ranges, the required refrigeration efficiency is different, four temperature intervals can be defined by the sequentially increased values of Ta, Tb and Tc, so that the controller can adjust the opening degree of the throttle valve 3 and the cooling power of the cooling circuit according to the sequentially increased temperatures of the battery 8, the minimum value of Ta, Tb and Tc is too small, the maximum value of Ta, Tb and Tc is too large, and the difference value between two adjacent temperature values is too small or too large, which easily causes great system oscillation in the adjustment process of the battery cooling system. According to the temperature value of the embodiment, the battery 8 can be ensured to be within the safe temperature range, the temperature difference between Ta and Tb and the temperature difference between Tb and Tc are proper, the cooling effect of the battery 8 and the passenger compartment can be ensured, and the system oscillation of the battery cooling system can be reduced.
In some embodiments, the first opening degree is 20% -40%, the second opening degree is 50% -70%, and the third opening degree is 80% -100%; the controller controls the refrigerating power of the refrigerating circuit by adjusting the rotating speed of the compressor 13 in the refrigerating circuit, when the refrigerating power of the refrigerating circuit is a first power, the rotating speed of the compressor 13 is n1, n1 is 1500r/min-2500r/min, when the refrigerating power of the refrigerating circuit is a second power, the rotating speed of the compressor 13 is n2, n2 is 3500r/min-4500r/min, when the refrigerating power of the refrigerating circuit is a third power, the rotating speed of the compressor 13 is n3, and n3 is 5500r/min-6500 r/min.
It can be understood that, as shown in fig. 3, when actually adjusting the opening degree of the throttle valve 3 and the rotation speed of the compressor 13, the controller needs to adjust the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 according to parameters such as ambient temperature, pressure and temperature of refrigerant at different positions in the refrigeration circuit, real-time temperature of the battery 8, real-time temperature of the passenger compartment, and the like, so that the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 calculated by the controller are not fixed values under different conditions, in this embodiment, the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 can be limited within a range of values according to actual conditions, so that the controller can output specific values of the opening degree of the throttle valve 3 and specific values of the rotation speed of the compressor 13 according to different operation parameters, and further reduce the system oscillation phenomenon occurring in the battery cooling system under the condition of, thereby improving the operational stability and operational life of the battery cooling system.
In some specific embodiments, the controller adjusts the values of the first opening degree, the second opening degree, the third opening degree, n1, n2 and n3 within the preset ranges thereof according to the input pressures and temperatures of the refrigerants detected by the first detecting member 15, the second detecting member 16 and the third detecting member 7.
Example (b):
a battery cooling system and a battery cooling control method according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
The battery cooling system of the present embodiment includes a refrigeration circuit, a cooling member 2, a throttle valve 3, an observation member 4, an HVAC assembly 5, a thermal expansion valve 6 with a shut-off function, and a controller, a third detection member 7.
The refrigeration circuit is fed with a refrigerant and has a first inlet 11 and a first outlet 12. The refrigeration circuit comprises a compressor 13, a condenser 14, a first check member 15, a second check member 16, a liquid-gas separation member 17, a high-pressure filling valve 18 and a low-pressure filling valve 19. The first inlet 11 communicates with a compressor 13. The condenser 14 has one end communicating with the compressor 13 and the other end communicating with the first outlet 12. Wherein the controller is configured to adjust the rotational speed of the compressor 13 in accordance with the temperature of the battery 8. The first detecting member 15 is provided between the compressor 13 and the condenser 14, and the first detecting member 15 detects the temperature and pressure of the refrigerant. The second sensing member 16 is disposed between the condenser 14 and the first outlet 12, and the second sensing member 16 is used to sense the temperature and pressure of the refrigerant. Wherein the controller is configured to adjust the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 according to the temperature and pressure of the refrigerant detected by the first and second detecting members 15 and 16. The liquid-gas separator 17 is disposed between the compressor 13 and the first inlet 11, and the liquid-gas separator 17 is configured to separate liquid refrigerant and gaseous refrigerant and to allow the gaseous refrigerant to enter the compressor 13. A high-pressure filler valve 18 is provided between the first outlet 12 and the third inlet 51, and a low-pressure filler valve 19 is provided between the third outlet 52 and the first inlet 11.
The cooling member 2 has a second inlet 21 and a second outlet 22, the second inlet 21 communicating with the first outlet 12, the second outlet 22 communicating with the first inlet 11, and the cooling member 2 is provided on the battery 8. A throttle 3 is provided between the first outlet 12 and the second inlet 21, the throttle 3 being used to adjust the flow of refrigerant into the cooling element 2. An observation member 4 is provided between the throttle valve 3 and the second inlet port 21, the observation member 4 being for observing the state of the refrigerant flowing out of the throttle valve 3. The HVAC assembly 5 has a third inlet 51 and a third outlet 52, the third inlet 51 communicating with the first outlet 12 and the third outlet 52 communicating with the first inlet 11, the HVAC assembly 5 being for cooling the passenger compartment. A thermostatic expansion valve 6 is provided between the first outlet 12 and the third inlet 51, the thermostatic expansion valve 6 being configured to close a flow passage between the first outlet 12 and the third inlet 51 when the temperature of the passenger compartment is below a preset value. The controller is configured to control the cooling power of the refrigeration circuit, the opening and closing of the thermostatic expansion valve 6, the opening degree of the throttle valve 3, the output power of the HVAC component 5, and the output power of the battery 8.
The third detecting member 7 is located between the second outlet 22 and the liquid-gas separating member 17, the third detecting member 7 is used for detecting the temperature and the pressure of the refrigerant, and the controller is configured to adjust the opening degree of the throttle valve 3 and the rotation speed of the compressor 13 according to the temperature and the pressure of the refrigerant detected by the third detecting member 7.
A battery cooling control method that employs the battery cooling system described above, the battery cooling control method comprising: s1, detecting the temperature of the battery 8 and the temperature of the passenger compartment, wherein the temperature of the battery 8 is recorded as Tbat, and the temperature of the passenger compartment is recorded as Tcabin; s2, if Tbat is larger than Ta, the throttle valve 3 is adjusted to a first opening degree, if Tcabin is larger than Tset, the thermostatic expansion valve 6 is opened, if Tbat is larger than Ta or Tcabin is larger than Tset, and the refrigerating power of the refrigerating circuit is adjusted to a first power; s3, detecting Tbat and Tcabin; s4, if Ta < Tbat < Tb and/or Tcabin > Tset, adjusting the opening degree of the throttle valve 3 to a second opening degree, and/or adjusting the refrigerating power of the refrigerating circuit to a second power, wherein the second power is larger than the first power, and the second opening degree is larger than the first opening degree; if Tcabin is less than Tset, the thermostatic expansion valve 6 is closed, and the step S3 is repeated; if Tbat < Ta, repeating step S1; if Tb < Tbat < Tc, adjusting the opening degree of the throttle valve 3 to a third opening degree, and adjusting the cooling power of the refrigeration circuit to a third power, the third power being greater than the second power, the third opening degree being greater than the second opening degree, and repeating step S3; if Tc < Tbat, the controller controls the battery 8 to stop charging and discharging. Ta of 33-37 ℃, Tb of 43-47 ℃ and Tc of 53-57 ℃. The first opening degree is 20-40%, the second opening degree is 50-70%, and the third opening degree is 80-100%; the controller controls the refrigerating power of the refrigerating circuit by adjusting the rotating speed of the compressor 13 in the refrigerating circuit, when the refrigerating power of the refrigerating circuit is a first power, the rotating speed of the compressor 13 is n1, n1 is 1500r/min-2500r/min, when the refrigerating power of the refrigerating circuit is a second power, the rotating speed of the compressor 13 is n2, n2 is 3500r/min-4500r/min, when the refrigerating power of the refrigerating circuit is a third power, the rotating speed of the compressor 13 is n3, and n3 is 5500r/min-6500 r/min.
In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A battery cooling system for cooling a battery (8), comprising:
a refrigeration circuit in which a refrigerant is circulated, said refrigeration circuit having a first inlet (11) and a first outlet (12);
a cooling member (2), the cooling member (2) having a second inlet (21) and a second outlet (22), the second inlet (21) communicating with the first outlet (12), the second outlet (22) communicating with the first inlet (11), the cooling member (2) being provided on the battery (8);
a throttle valve (3), said throttle valve (3) being provided between said first outlet (12) and said second inlet (21), said throttle valve (3) being used for adjusting the flow of said refrigerant into said cooling member (2);
an observation member (4), the observation member (4) being provided between the throttle valve (3) and the second inlet port (21), the observation member (4) being for observing a state of the refrigerant flowing out of the throttle valve (3);
an HVAC assembly (5), the HVAC assembly (5) having a third inlet (51) and a third outlet (52), the third inlet (51) communicating with the first outlet (12), the third outlet (52) communicating with the first inlet (11), the HVAC assembly (5) for cooling a passenger compartment;
a thermostatic expansion valve (6) with a cut-off function, the thermostatic expansion valve (6) being provided between the first outlet (12) and the third inlet (51), the thermostatic expansion valve (6) being configured to cut off a flow passage between the first outlet (12) and the third inlet (51) when the temperature of the passenger compartment is below a preset value;
a controller configured to control a cooling power of the refrigeration circuit, a switching of the thermostatic expansion valve (6), an opening degree of the throttle valve (3), an output power of the HVAC component (5), and an output power of the battery (8).
2. The battery cooling system of claim 1, wherein the refrigeration circuit comprises:
a compressor (13), said first inlet (11) being in communication with said compressor (13);
a condenser (14), one end of the condenser (14) is communicated with the compressor (13), and the other end is communicated with the first outlet (12); wherein:
the controller is configured to adjust the rotational speed of the compressor (13) in accordance with the temperature of the battery (8).
3. The battery cooling system of claim 2, wherein the refrigeration circuit further comprises:
a first detection member (15), the first detection member (15) being provided between the compressor (13) and the condenser (14), the first detection member (15) being for detecting a temperature and a pressure of the refrigerant;
a second detection member (16), said second detection member (16) being provided between said condenser (14) and said first outlet (12), said second detection member (16) being for detecting a temperature and a pressure of said refrigerant; wherein:
the controller is configured to adjust the opening degree of the throttle valve (3) and the rotational speed of the compressor (13) in accordance with the temperatures and pressures of the refrigerant detected by the first detecting member (15) and the second detecting member (16).
4. The battery cooling system according to claim 2, characterized in that the cooling power of the cooling circuit increases with increasing rotational speed of the compressor (13).
5. The battery cooling system according to claim 2, wherein the refrigeration circuit further comprises a liquid-gas separator (17), the liquid-gas separator (17) being provided between the compressor (13) and the first inlet (11), the liquid-gas separator (17) being configured to separate the refrigerant in the liquid state and the refrigerant in the gaseous state and to let the refrigerant in the gaseous state enter the compressor (13).
6. The battery cooling system according to claim 5, further comprising a third detection member (7), the third detection member (7) being located between the second outlet (22) and the liquid-gas separation member (17), the third detection member (7) being for detecting a temperature of the refrigerant and a pressure of the refrigerant, the controller being configured to adjust the opening degree of the throttle valve (3) and the rotational speed of the compressor (13) in accordance with the temperature and the pressure of the refrigerant detected by the third detection member (7).
7. Battery cooling system according to claim 1, characterised in that the refrigeration circuit further comprises a high-pressure filling valve (18) and a low-pressure filling valve (19), the high-pressure filling valve (18) being provided between the first outlet (12) and the third inlet (51), the low-pressure filling valve (19) being provided between the third outlet (52) and the first inlet (11).
8. A battery cooling control method that employs the battery cooling system according to any one of claims 1 to 7, characterized by comprising:
s1, detecting the temperature of the battery (8) and the temperature of a passenger compartment, wherein the temperature of the battery (8) is recorded as Tbat, the temperature of the passenger compartment is recorded as Tcabin, a first preset temperature value is recorded as Ta, a second preset temperature value is recorded as Tb, a third preset temperature value is recorded as Tc, and a fourth preset temperature value is recorded as Tset;
s2, if the Tbat is larger than the Ta, adjusting the throttle valve (3) to a first opening degree, if the Tcabin is larger than the Tset, opening the thermal expansion valve (6), if the Tbat is larger than the Ta or the Tcabin is larger than the Tset, opening and adjusting the refrigerating power of the refrigerating circuit to a first power;
s3, detecting the Tbat and the Tcabin;
s4, if Ta < Tbat < Tb and/or Tcabin > Tset, adjusting the opening of the throttle valve (3) to a second opening, and/or adjusting the refrigeration power of the refrigeration circuit to a second power, wherein the second power is larger than the first power, and the second opening is larger than the first opening; if Tcabin is less than Tset, the thermal expansion valve (6) is closed, and the step S3 is repeated; if the Tbat < the Ta, repeating step S1;
if Tb < Tbat < Tc, adjusting the opening degree of the throttle valve (3) to a third opening degree, and adjusting the cooling power of the cooling circuit to a third power, the third power being greater than the second power, the third opening degree being greater than the second opening degree, and repeating step S3;
if the Tc < the Tbat, the controller controls the battery (8) to stop charging and discharging.
9. The battery cooling control method according to claim 8, wherein the Ta is 33 ℃ to 37 ℃, the Tb is 43 ℃ to 47 ℃, and the Tc is 53 ℃ to 57 ℃.
10. The battery cooling control method according to claim 8, wherein the first opening degree is 20% to 40%, the second opening degree is 50% to 70%, and the third opening degree is 80% to 100%; the controller controls the refrigerating power of the refrigerating circuit by adjusting the rotating speed of a compressor (13) in the refrigerating circuit, when the refrigerating power of the refrigerating circuit is the first power, the rotating speed of the compressor (13) is 1500r/min-2500r/min, when the refrigerating power of the refrigerating circuit is the second power, the rotating speed of the compressor (13) is 3500r/min-4500r/min, and when the refrigerating power of the refrigerating circuit is the third power, the rotating speed of the compressor (13) is 5500r/min-6500 r/min.
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| CN202011344463.1A CN112467246A (en) | 2020-11-25 | 2020-11-25 | Battery cooling system and battery cooling control method |
| PCT/CN2021/132988 WO2022111556A1 (en) | 2020-11-25 | 2021-11-25 | Battery cooling system, battery cooling control method, apparatus and storage medium |
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| WO2023093003A1 (en) * | 2021-11-29 | 2023-06-01 | 青岛海尔空调器有限总公司 | Control method for temperature management system of vehicle, and temperature management system |
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