CN105522932B - Vehicular dynamic battery group active air cooling cooling system and its control method - Google Patents

Vehicular dynamic battery group active air cooling cooling system and its control method Download PDF

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Publication number
CN105522932B
CN105522932B CN201510962342.6A CN201510962342A CN105522932B CN 105522932 B CN105522932 B CN 105522932B CN 201510962342 A CN201510962342 A CN 201510962342A CN 105522932 B CN105522932 B CN 105522932B
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air
temperature
cooling
battery
control
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CN105522932A (en
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闵海涛
邱天宇
于远彬
井子源
徐涛
赖长禄
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Jilin University
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Jilin University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24Methods 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
    • B60L58/26Methods 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles

Abstract

The invention discloses a kind of Vehicular dynamic battery group active air cooling cooling system, and to realize real-time change of the cooling system with electrokinetic cell different conditions, the too high risk of battery pack temperature is greatly reduced.Including crew module's air-conditioning system, power battery pack cooling line, ducting system and control system;Power battery pack cooling line includes No. two magnetic valves, No. two electric expansion valves, No. two evaporators, No. two evaporating pressure regulating valves, No. two check valves being connected in turn between condensator outlet and fluid reservoir entrance, the coolant circulation formed outside crew module's air-conditioning system;The entrance of the ducting system connects No. two evaporators and passenger cabin, the outlet connection power battery box of ducting system respectively;The control system includes battery management system, conditioning control unit and the cooling system control unit to be communicated by CAN with entire car controller.The invention also discloses a kind of control method of Vehicular dynamic battery group active air cooling cooling system.

Description

Vehicular dynamic battery group active air cooling cooling system and its control method
Technical field
The present invention relates to electric automobile field, more particularly to a kind of Vehicular dynamic battery group active air cooling cooling system and its Control method.
Background technology
According to correlative study, charge-discharge magnification, electrokinetic cell SOC states and environment temperature have not to electrokinetic cell internal resistance With the influence of degree, and then temperature rise speed is influenceed, and in south China, summer temp can reach 35 degree of even more highs above freezing, Battery heat-sinking capability is poor under the conditions of this, it is therefore desirable to carries out quick heat radiating to battery, to reach ideal working temperature, keeps away Exempt from the adverse consequences caused by battery pack temperature overheats.So according to the difference of electrokinetic cell working condition, it is necessary to take Different radiating strategies.And when battery surface temperature is too high, internal temperature of battery often exceedes permissible upper already, therefore Easily battery life is caused to decline because battery temperature is too high.Battery heating increases mainly due to the internal resistance of cell, the internal resistance of cell Refer to battery at work, electric current flows through the resistance suffered by inside battery, is made up of ohmic internal resistance and polarization resistance.
At present, it is cold and air-cooled to be broadly divided into liquid for the cooling means of electrokinetic cell used in electric automobile.Liquid cooling efficiency high, But complicated and maintenance is constant.Gas cooling is mostly that natural wind is cooled down with air blast cooling but, and the latter's cooling effect is significantly stronger than The former.Wind is forced mainly to be realized by fan from crew module or external environment air draught.
Fuzzy control is the basic thought and theoretical control method using fuzzy mathematics.In traditional control field, The whether accurate of control system dynamic mode is to influence the good and bad key of control.However, for complicated system or it is difficult to accurate The system of description, then seem helpless.Therefore just attempt to handle these control problems with fuzzy mathematics." fuzzy " is Human perception all things on earth, obtain knowledge, thinking reasoning, the key character of decision implement." fuzzy " is than information that " clear " is possessed Capacity is bigger, and intension is more rich, more meets objective world.Fuzzy control is substantially a kind of nonlinear Control, is subordinated to intelligence The category of control.One big feature of fuzzy control is the theory of existing systematization, there is substantial amounts of actual application background again.
Electric automobile air-conditioning system uses motor compressor more, and it is vehicle occupant compartment system using the electric energy of electrokinetic cell It is cold.The leaving air temp regulation of evaporator in air-conditioning is that the pressure of low pressure gauge is adjusted by controlling evaporating pressure to realize Force value, the height of low pressure is adjusted by adjusting the aperture of heating power expansion valve (or choke valve) in operation.Expansion valve is opened Degree is big, and evaporating temperature rise, low pressure also raises, and refrigerating capacity will increase;If expansion valve open degree is small, evaporating temperature drop Low, low pressure is also reduced, and refrigerating capacity will be reduced.
The cooling system of current driving force battery can only realize fixed radiating effect, can not be according to the work shape of electrokinetic cell State and physical state real-time change, it can not be cooled in time once divergent trend occurs in temperature of powered cell, therefore the effect that radiates Fruit is poor.
The content of the invention
The object of the invention is exactly a kind of Vehicular dynamic battery provided to improve Vehicular dynamic battery group radiating efficiency Group active air cooling cooling system, to realize real-time change of the cooling system with electrokinetic cell different conditions, is greatly reduced battery The too high risk of group temperature.
The purpose of the present invention is realized by following scheme, with reference to accompanying drawing:
The present invention provides a kind of Vehicular dynamic battery group active air cooling cooling system, including crew module's air-conditioning system 100, its Including condenser 1, motor compressor 2, fluid reservoir 3, air blower 4, No.1 evaporator 5, No.1 electric expansion valve 9, No.1 temperature Sensor 10, the outlet of condenser 1 are entered again after No.1 electric expansion valve 9, No.1 evaporator 5, fluid reservoir 3, compressor 2 successively Enter condenser inlet, form the coolant circulation of crew module's air-conditioning system;
The Vehicular dynamic battery group active air cooling cooling system also include power battery pack cooling line, ducting system with And control system;The power battery pack cooling line include being connected in turn the condenser 1 outlet and the entrance of fluid reservoir 3 it Between the evaporator 15, two of electric expansion valve 12, two of No. two magnetic valves 11, two evaporating pressure regulating valve 14, two it is unidirectional Valve 13, the coolant circulation formed outside crew module's air-conditioning system;The entrance of the ducting system connects No. two evaporators 15 respectively With passenger cabin 16, the outlet connection electrokinetic cell casing 31 of ducting system;The control system includes passing through CAN Battery management system 32, conditioning control unit 34 and the cooling system control that (controller local area network) communicates with entire car controller 33 Unit 35 processed.
A kind of described Vehicular dynamic battery group active air cooling cooling system, wherein, crew module's air-conditioning system 100 is also Including No.1 check valve 6, No.1 evaporating pressure regulating valve 7 and No.1 magnetic valve 8, No.1 magnetic valve 8 is arranged on the condenser 1 Before outlet and the entrance of No.1 electric expansion valve 9, the entrance of No.1 evaporating pressure regulating valve 7 connection No.1 evaporator 5, No.1 evaporation The entrance of the outlet of pressure-regulating valve 7 connection No.1 check valve 6, the outlet of No.1 check valve 6 connects the entrance of fluid reservoir 3.
A kind of described Vehicular dynamic battery group active air cooling cooling system, wherein, the ducting system includes No.1 wind The air channel 18 of road 17, two and No. three air channels 23, No. two air channels 18 entrance connection passenger cabin 16, the connection of the entrance of No.1 air channel 17 No. two evaporators 15, the outlet of No.1 air channel 17 and No. two air channels 18 export No. three entrances of air channel 23 of connection jointly, No. three air channels 23 End connects the air inlet of power battery box 31, and the air inlet of power battery box 31 is provided with induced draught fan 25, casing it is another Side is provided with air outlet and air ejector fan 26.Power battery pack is placed in electrokinetic cell casing 31.
A kind of described Vehicular dynamic battery group active air cooling cooling system, wherein, the porch in No. two air channels 18 is set There are No. two temperature sensors 27 and No. two air doors 20, No. two air doors 20 are connected with No. two stepper motors 22 by spline;No.1 wind No.1 air door 19 is provided with road 17, No.1 air door 19 is connected with No.1 stepper motor 21 by spline;No. two evaporators 15 Wind outlet is provided with No. three temperature sensors 28, and the air inlet of Battery case is additionally provided with No. four temperature sensors 29 and wind speed Sensor 24.
Present invention simultaneously provides a kind of control method of Vehicular dynamic battery group active air cooling cooling system, power train in vehicle application electricity Pond group active air cooling cooling system includes crew module's air-conditioning system 100, power battery pack cooling line, ducting system and control System, the power battery pack cooling line are connected to the outlet of condenser 1 and the fluid reservoir 3 of crew module's air-conditioning system 100 Between entrance, it includes No. two evaporators 15, and the ducting system includes the air channel 18 of No.1 air channel 17, two and No. three air channels 23, No. two air channels 18 entrance connection passenger cabin 16, the entrance of No.1 air channel 17 connects No. two evaporators 15, and No.1 air channel 17 goes out Mouth and No. two air channels 18 export No. three entrances of air channel 23 of connection jointly, and No. three air channels 23 end connects the air intake of power battery box 31 Mouthful, the air inlet of Battery case is provided with induced draught fan 25, and the opposite side of Battery case is provided with air ejector fan 26;
The control method comprises the following steps:
Step 1: being combined using fuzzy control and leveling factor method, obtain system temperature control coefficients R and judge temperature control system Whether number R is zero;
Step 2: when temperature control coefficients R is zero, show that power battery pack temperature is too low and without radiating requirements, now needs to stop It is come air temperature and the size selection of battery-efficient operating temperature lower limit with power battery pack cooling line and according to crew module It is no to need crew module's air-supply to heat power battery pack;
Step 3: if temperature control coefficients R is not zero, show that power battery pack there are radiating requirements, now need to parse battery case Required EAT TAir intake, and the EAT selection radiating mode according to needed for battery case radiates to power battery pack.
A kind of control method of described Vehicular dynamic battery group active air cooling cooling system, wherein, the step 1 profit It is combined with fuzzy control and leveling factor method, obtains system temperature control coefficients R, specifically include procedure below:
1) the compound influence coefficient Q of reflection power battery pack radiating requirements is determined according to fuzzy control method first:
1.1) input quantity and output quantity of fuzzy controller are determined:Input quantity is current power battery set charge/discharge current value With present battery surface temperature value, output quantity is compound influence coefficient Q;
1.2) input quantity of fuzzy controller, the value of output quantity and domain scope are determined;
1.3) input quantity and output quantity of fuzzy controller are blurred, determine charging and discharging currents, battery surface temperature The quantizing factor of degree and compound influence coefficient Q, respectively Ki=2/C, Kt=1/10 and Kc=1.C is current discharge and recharge times Rate.It is domain value that actual value, which is multiplied by quantizing factor,;Membership function is determined, i.e.,σ distinguishes in function For 0.15,3 and 0.3;C is normal distribution median, and span is the actual value of variable of above-mentioned fuzzy controller, x values For system input value, as charge-discharge magnification and battery surface temperature;
1.4) fuzzy inference rule is determined, fuzzy matrix table is formulated based on fuzzy inference rule;
2) usage factor revised law will pass through above-mentioned steps 1) fuzzy control method determine meet influence coefficient Q pass through successively Cross and correct three times, obtain system temperature control coefficients R.
R=W × u1 × u2=Q × Ksoc × u1 × u2
Wherein,
Q is compound influence coefficient;
Ksoc is SOC correction factors;
W is temperature prediction coefficient, and span is determined by Q and Ksoc;
U1 is battery case internal temperature correction factor;
U2 is battery surface rate of temperature change correction factor.
A kind of control method of described Vehicular dynamic battery group active air cooling cooling system, wherein, the step 2 is worked as When temperature control coefficients R is zero, show that power battery pack temperature is too low and control process during without radiating requirements is:
1) the power battery pack cooling line is disabled, No. two evaporators 15 do not freeze and close No.1 air channel 17;
2) judge that passenger cabin 16 comes whether air temperature is higher than default battery-efficient operating temperature lower limit (definite value 3);
3) if passenger cabin 16 carrys out air temperature and is higher than battery-efficient operating temperature lower limit (definite value 3), No. two are enabled Air channel 18 makes passenger cabin 16 carry out wind, and adjusts the rotating speed preheating battery pack of induced draught fan 25 and air ejector fan 26;It is if in-car Crew module 16 carrys out air temperature and is less than battery-efficient operating temperature lower limit (definite value 3), then closes No. two air channels 18 and close down air draught Fan 25 and air ejector fan 26.
A kind of control method of described Vehicular dynamic battery group active air cooling cooling system, wherein, if the step 3 Temperature control coefficients R is not zero, and shows that power battery pack has control process during radiating requirements to be:
1) the EAT T according to needed for system temperature control coefficients R parses battery caseAir intake, analytic formula is as follows:
Wherein, NcFor the scope of temperature control coefficients R,
WithTake the definite value between 0 to 2;
Qmax=8, Qmin=0;
QmaxFor default EAT maximum, unit:℃;
TminFor default EAT minimum value, unit:℃;
TAir intakeFor EAT needed for battery case, unit:℃.
If 2) through above-mentioned steps 1) EAT T needed for the battery case that parsesAir intakeHigher than when the temperature in the first two number air channel 18 T2, then No. two evaporators 15 do not work still, and completely close No.1 air door 19, maintain now induced draught fan 25 and air ejector fan 26 Rotating speed;
If 3) as the EAT T in the first two number air channel 182With through above-mentioned steps 1) the EAT T that extrapolatesAir intakeDiffer small When 10%, i.e. (T2-TAir intake)/TAir intake<10%, No. two evaporators 15 is worked, increase induced draught fan 25 and air ejector fan 26 rotating speed, air mass flow is improved to make up the deficiency of EAT;
If 4) as the EAT T in the first two number air channel 182With through above-mentioned steps 1) EAT extrapolated differs by more than When 10%, i.e. (T2-TAir intake)/TAir intake>10%, then forced heat radiation pattern is opened, and ensure that cooling system was adjusted in EAT Intake in journey is constant;
5) battery surface temperature will finally be judged whether in the range of being previously set, to system temperature control if going beyond the scope Coefficients R is modified, and recalculates radiating requirements.
A kind of control method of described Vehicular dynamic battery group active air cooling cooling system, wherein, the step 3 kind Step 4) opens forced heat radiation pattern, and ensures the constant control of intake of the cooling system during EAT regulation Cheng Wei:
Step 401, No. two evaporators 15 start to freeze, and adjust the intake in No.1 air channel 17 and No. two air channels 18, protect Demonstrate,prove the EAT T needed for battery caseAir intake:No.1 air channel 17 is opened to be at maximum air intake state and make No. two evaporators 15 Start to freeze, while adjust No. two intakes of air channel 18;
Step 402, complete the EAT T needed for the step 401 control battery caseAir intakeAfterwards, induced draught fan 25 is adjusted With the rotating speed of air ejector fan 26, to ensure that the intake of battery case is constant;
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, again The intake and No. two evaporators 15 in No.1 air channel 17 and No. two air channels 18 are controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, again to inhaling Wind fan 25 and air ejector fan 26 implement control.
A kind of control method of described Vehicular dynamic battery group active air cooling cooling system, wherein, in the step 401 EAT T needed for battery caseAir intakeRegulation during, the gas temperature in No.1 air channel 17 is set first, then needed for EAT adjusts the aperture of No. two air doors 20 set in No. two air channels 18, the No.1 air door now set in No.1 air channel 17 19 keep full-gear, form required air quantity ratio;
It is as follows that formula can be obtained by The Ideal-Gas Equation:
V1T1+ V2T2=(V1+ V2)TAir intake,
Wherein, Vi=vi×Ai, i=1,2, ViIt is air channel air mass flow, V1It is the air mass flow in No.1 air channel 17, V2It is two The air mass flow in number air channel 18, unit:m3/s;A1It is the sectional area in No.1 air channel 17, A2It is the sectional area in No. two air channels 18, it is single Position:m2;v1It is the wind speed in No.1 air channel 17, v2It is the wind speed in No. two air channels 18, unit:M/s, and v1=v2;T1It is No.1 air channel 17 gas temperature, T2It is the gas temperature in No. two air channels 18, unit:℃;A3It is that No. three duct cross-sections accumulate, and A1max+A2max= A3, unit:m2
Compared with prior art, advantages of the present invention is:
All electrokinetic cell wind-cooling heat dissipating operating modes are more single on current market, when electrokinetic cell state changes When, unavoidable radiating effect is poor.By above technical scheme, the present invention according to the current physical state of electrokinetic cell and can fill The factors such as electric discharge operating mode adjust electrokinetic cell cooling system in real time, realize on the premise of energy expenditure is reduced as far as possible, improve dynamic Power battery radiating effect, and then improve electrokinetic cell service life.And control method provided by the invention can be in power electric Before pond temperature rise reaches battery surface (being detected by temperature sensor), battery temperature rise is suppressed, there is certain temperature rise Effect is predicted, and then be greatly reduced causes electrokinetic cell internal chemical composition that the general of irreversible change occurs because temperature is too high Rate.The present invention can realize that crew module's refrigeration and power battery pack cooling line are non-interference, and when crew module's temperature is relatively low, Make full use of the air of crew module to cool down power battery pack, reduce No. two evaporators and fan as far as possible in terms of battery pack radiating Power is consumed, therefore the present invention can practice every conceivable frugality electric energy on the premise of radiating effect is ensured.
Brief description of the drawings
Fig. 1 is Vehicular dynamic battery group active air cooling cooling system structure schematic diagram
Fig. 2 is the control flow chart of the present invention
Fig. 3 is that temperature control coefficient calculates flow chart
Fig. 4 is forced heat radiation mode logic flow chart
In figure:
1st, condenser 2, motor compressor 3, fluid reservoir 4, air blower 5, No.1 evaporator 6, No.1 check valve 7, No.1 are steamed Send out pressure-regulating valve 8, No.1 magnetic valve 9, No.1 electric expansion valve 10, the magnetic valve 12, two of No.1 temperature sensor 11, two The evaporating pressure regulating valve of check valve 14, two of electric expansion valve 13, two 15, No. two evaporators 16, crew module 17, No.1 air channels 18th, No. two air channels 19,20, No. two air doors 21 of No.1 air door, the stepper motor 23, three of No.1 stepper motor 22, two air channel 24, Air velocity transducer 25, induced draught fan 26,29, No. four temperature of temperature sensor of temperature sensor 28, three of air ejector fan 27, two 30, No. five temperature sensors 31 of sensor, power battery box 32, battery management system (BMS) 33, entire car controller (VCU) 34, Conditioning control unit 35, cooling system control unit 100, crew module's air-conditioning system
Embodiment
The object of the invention is exactly in order to improve electric automobile power battery group radiating efficiency, and the one kind provided is based on obscuring The power battery pack active air cooling cooling system of control, to realize real-time change of the cooling system with electrokinetic cell different conditions Change.
Technical scheme is described below in conjunction with the accompanying drawings, described by accompanying drawing is only a part for invention Rather than whole embodiment.
As shown in Figure 1, it is a kind of Vehicular dynamic battery group active air cooling cooling system provided by the invention, including Crew module's air-conditioning system 100 (including condenser 1, motor compressor 2, fluid reservoir 3, air blower 4, No.1 evaporator 5, No.1 list To valve 6, No.1 evaporating pressure regulating valve 7, No.1 magnetic valve 8, No.1 electric expansion valve 9, No.1 temperature sensor 10, wherein one Number check valve 6, No.1 evaporating pressure regulating valve 7, No.1 magnetic valve 8 belong to increases portion newly on the basis of traditional crew module's air-conditioning system Part), install power battery pack cooling line, including No. two lists of electric expansion valve 12, two of magnetic valve 11, two additional on this basis To the evaporator 15 of evaporating pressure regulating valve 14, two of valve 13, two.In addition the system also includes ducting system and control is System, ducting system include 21, No. two air channel 18, three of No.1 air channel 17, two air channel 23, No.1 stepper motor stepper motors 22nd, 29, No. five temperature sensors 30 of No. two temperature sensors of temperature sensor 28, four of temperature sensor 27, three, wind speed pass Sensor 24,19, No. two air doors 20 of No.1 air door, induced draught fan 25 and air ejector fan 26, control system include battery management system (BMS) 32, conditioning control unit 34, cooling system control unit 35, battery management system (BMS) 32, conditioning control unit 34, Cooling system control unit 35 is communicated by CAN with entire car controller (VCU) 33.
In system provided by the present invention, specific implementation is as follows, and on the basis of traditional electric air-conditioning, car external condenser 1 goes out At mouthful, coolant flow direction is divided into two, and one freezes for traditional crew module, i.e., condenser 1 connects entering for No.1 magnetic valve 8 The entrance of outlet connection No.1 electric expansion valve 9 of mouth, No.1 magnetic valve 8, the outlet of No.1 electric expansion valve 9 connection No.1 evaporator 5;Another provides cooling wind, i.e. No. two entrances of magnetic valve 11 of the outlet of condenser 1 connection, No. two magnetic valves 11 for power battery pack Outlet connect No. two entrances of electric expansion valve 12, No. two evaporators 15 of No. two expansion valves 12 outlet connection.Each refrigerator pipes Road, connect No.1 evaporating pressure regulating valve 7 and No. two evaporating pressure regulating valves 14 respectively after evaporator, this is due to two The evaporating temperature of evaporator is different, it is necessary to which regulation loine pressure returns again to same pipeline respectively.Before fluid reservoir is returned, two Pipeline is respectively necessary for connecing No.1 check valve 6 and No. two check valves 13, prevents that coolant is back to another when a pipeline works Bar pipeline.Last two pipelines uniformly connect the entrance of fluid reservoir 3, are compressed by compressor 2, condenser 1 is condensed into next Individual kind of refrigeration cycle.
Power battery pack uses air blast cooling form, and cooling wind source has two.One is that crew module 16 comes wind, i.e., No. two Air channel 18;Secondly come wind, i.e. No.1 air channel 17 for No. two evaporators 15;Then mixing wind, air draught are formed in No. three air channels 23 Mixing wind is sent into power battery box 31 by fan 25, and cooling is provided to be placed on the power battery pack of box house.For the ease of Wind discharge power battery box 31 is cooled down, casing exhaust outlet is provided with air ejector fan 26.
No. three air channels 23, as the wind that comes in No.1 air channel 17 and No. two air channels 18 is mixed.Wherein No. two air channels 18 connect Passenger cabin 16, No. two temperature sensors 27 and No. two air doors 20 are provided with the porch in No. two air channels 18, are respectively used to Monitoring carrys out No. two apertures of air channel 18 of air temperature and control, and No. two air doors 20 are connected with No. two stepper motors 22 by spline, No. two Stepper motor 22 drives No. two air doors 20 to rotate;The entrance in No.1 air channel 17 connects No. two evaporators 15, No. two evaporators 15 Wind outlet is provided with No. three temperature sensors 28, it is therefore an objective to the leaving air temp of No. two evaporators is gathered, in addition in No.1 air channel 17 Be also equipped with No.1 air door 19, for control the aperture in No.1 air channel 17, No.1 air door 19 and No.1 stepper motor 21 also by Spline connects, and No.1 stepper motor 21 drives No.1 air door 19 to rotate.No. three air channels 23 end connection power battery box 31 enters Air port, the air inlet of power battery box 31 are provided with 25, No. four temperature sensors 29 of induced draught fan and air velocity transducer 24, point Cooling mixing wind Yong Yu not be sent into casing, monitor battery case EAT and monitoring intake.Mesh for convenience of description , the follow-up power battery box EAT is referred to as EAT.The opposite side of power battery box 31 is provided with air-out Mouth and air ejector fan 26, it is easy to cooling wind smoothly to discharge, box house is provided with No. five temperature sensors 30 in addition, for gathering Battery case environment temperature.
In the water cooling system, 9, No. two 8, No. two magnetic valves 11 of No.1 magnetic valve, No.1 electric expansion valve electronics 10, No. three expansion valve 12,5, No. two evaporators 15 of No.1 evaporator, air blower 4, No.1 temperature sensor temperature sensors 28 etc. Air conditioning system components are belonged to, therefore part described above controls by conditioning control unit 34;No. two temperature sensors 27, four Number temperature sensor 29,21, No. two stepper motors 22 of No.1 wind stepper motor, air velocity transducer 24 control single by cooling system Member 33 controls;The data acquisition of No. five temperature sensors 30 and the collection of battery surface temperature are by battery management system (BMS) 32 complete.
The control method of a kind of Vehicular dynamic battery group active air cooling cooling system of the present invention, as shown in Fig. 2 bag Include following steps:
Step 1: obtain system temperature control coefficients R and judge whether temperature control coefficients R is zero, as shown in Figure 3.
Temperature control coefficients R is determined by both natural heat-exchange situations inside the size and Battery case of the internal resistance of cell, and then is reacted Battery forced heat radiation demand size, radiating requirements are embodied by EAT, such as when temperature control coefficients R value is larger, are shown current The internal resistance of cell is larger under state, and battery radiating requirements are higher, therefore required EAT is relatively low, and vice versa.Utilize Fuzzy Control Preparation method and leveling factor method are combined, and obtain temperature control coefficients R, it can go out the radiating requirements of current power battery pack with active reaction It is and unconventional according to battery surface temperature feedback radiating requirements with battery temperature rise trend.Detailed process is as follows:
1) determine that compound influence coefficient Q, compound influence coefficient Q are also reaction power battery according to fuzzy control method first The amount of group radiating requirements.
1.1) input quantity and output quantity of fuzzy controller are determined, input quantity is current power battery set charge/discharge current value With present battery surface temperature value.Wherein battery surface temperature is measured using the sensor for being attached to battery cell surface, finally Input value is all monomer temperature peaks for currently measuring, and battery set charge/discharge current value is from battery management system (BMS) 32 Obtain, current value size is represented using charge-discharge magnification.Output quantity is compound influence coefficient Q.
1.2) input quantity of fuzzy controller, the value of output quantity and domain scope are determined.Charging and discharging currents value scope, electricity Pool surface temperature range and compound influence coefficient Q scopes, value be respectively { VL, SL, LO, NM, HI, SH, VH }, NM, NS, ZE, PS, PM, PB, PVB, PEB }, { ZE, SM, MD, BG, VB, VVB, EB, VEB, EEB }, specific actual value for 0,0.5C, 1C, 1.5C, 2C, 2.5C, 3C }, { -20, -10,0,10,20,30,40,50 } and { 0,1,2,3,4,5,6,7,8 }, wherein C are charge and discharge Electric multiplying power, such as 1C electric discharges are one hour theoretical current that battery capacity is discharged, unit is ampere (A);Battery surface temperature It is degree Celsius (DEG C) to spend unit;Compound influence coefficient Q is without unit.And then determine domain value be respectively { 0,1,2,3,4,5,6 }, { -2, -1,0,1,2,3,4,5 } and [0,1,2,3,4,5,6,7,8].
1.3) input quantity and output quantity of fuzzy controller are blurred, determine charging and discharging currents, battery surface temperature The quantizing factor of degree and compound influence coefficient Q, respectively Ki=2/C, Kt=1/10 and Kc=1.Actual value be multiplied by quantization because Son is domain value;Determine membership function, in the present invention charging and discharging currents, battery surface temperature and compound influence coefficient Q this Three variables use normal distribution type (Gaussian bases) membership function, i.e.,σ is respectively in function 0.15,3 and 0.3, no unit;C is normal distribution median, and span is the actual value of variable of above-mentioned fuzzy controller, Unit is same as above, and x values are system input value, as charge-discharge magnification and battery surface temperature, and span and unit are same as above institute State.
1.4) fuzzy inference rule is determined, when battery surface temperature is in the range of -20 to 20 degree, it is believed that with temperature Rise the internal resistance of cell to be gradually reduced, therefore radiating requirements are gradually reduced;When battery surface temperature is spent in 20 to 40, it is believed that battery temperature Degree is suitable;When battery surface temperature is higher than 40 degree, it is believed that temperature is higher to be radiated.For charging and discharging currents, recognize Higher for charge-discharge magnification, then the internal resistance of cell is bigger, therefore radiating requirements are higher, i.e., compound influence coefficient Q is bigger.It is then based on Above Rulemaking fuzzy matrix table.Regular matrix table is as follows:
1.5) gravity model appoach defuzzification output compound influence coefficient Q.
2) because compound influence coefficient Q still can not preferably react the radiating requirements of present battery and the temperature rise of battery becomes Gesture, therefore this coefficient will be modified.Amendment is divided into three times:
2.1) correct for the first time:It is modified for the first time according to the current state-of-charge of battery (SOC states), it is main to consider Influence of the SOC states to the internal resistance of cell, i.e., six stages are divided into internal resistance of cell state according to SOC states, that is, discharge operating mode with And under charging operating mode, the following three kinds of states of SOC points of battery pack:Higher than definite value 1, or less than definite value 2, or higher than definite value 2 and it is less than Definite value 1 (above-mentioned definite value 2 is less than definite value 1), the internal resistance of cell be when battery SOC is under above-mentioned three kinds of different conditions it is different, Therefore temperature rise trend is directly affected.Such as when battery is in electric discharge operating mode, and SOC is between definite value 2 and definite value 1, now Think, the internal resistance of cell is minimum, therefore adjusted coefficient K soc2 takes minimum value;When battery is in charging operating mode, and SOC is less than definite value 2 When, now think internal resistance of cell maximum, therefore adjusted coefficient K soc4 takes maximum, remaining Ksoc value by that analogy, this hair Bright middle Ksoc spans are 0 to 2, no unit, specifically need to obtain internal resistance rule by the experiment of different types of electrokinetic cell And then determine Ksoc six kinds of values.Compound influence coefficient is multiplied to obtain temperature prediction coefficient W with Ksoc, and this coefficient is still to push away Calculate the median during temperature control coefficients R.
2.2) second of amendment:Now amendment is according to the environment temperature T inside battery case, if rule is battery case temperature With the effect for suppressing battery temperature rise when relatively low, i.e. battery natural cooling effect is preferable, therefore the radiating for cooling system needs Ask less, vice versa.Battery case interior environment temperature is arranged to u1 to the correction factor of radiating requirements.T scope is -20 DEG C To 40 DEG C, when T values are -20 to 0 DEG C, u1 is set to 0.When T values are from 0 DEG C to 40 DEG C, often increase by 1 DEG C of corresponding u1 value from 0 increase 0.05, u1 span is that 0 to 2, u1 is correction factor, therefore without unit.
2.3) third time is corrected:Now amendment is according to battery surface rate of temperature change Δ t, if rule is rate of temperature change To be just and larger, illustrate that radiating effect is poor, radiating requirements need to be increased;If rate of temperature change is larger for negative and absolute value, explanation Radiating is excessive, the purpose for preventing battery temperature too low and for energy-conservation, now needs the radiating reduced to cooling system Ask.Battery surface rate of temperature change is arranged to u2 to the correction factor of radiating requirements.Rate of change Δ t from -1 DEG C/s to 1 DEG C/s when, Often increase by 0.1 DEG C/s, u2 from zero 0.1, u2 of corresponding increase span be that 0 to 2, u2 is correction factor, therefore without unit.
Whether the temperature control coefficients R that the 2nd, can be obtained the temperature control coefficients R of system by above-mentioned steps and judge to obtain is zero.Temperature The calculating formula for controlling coefficients R is as follows:
R=W × u1 × u2=Q × ksoc × u1 × u2
Q is compound influence coefficient, and span is 0 to 8;
Ksoc is SOC correction factors, and value is six kinds of different definite values;
W is temperature prediction coefficient, and span is determined by Q and Ksoc;
U1 is battery case internal temperature correction factor, and span is 0 to 2;
U2 is battery surface rate of temperature change correction factor, and span is 0 to 2.
Step 2: when temperature control coefficients R is zero, show that power battery pack temperature is too low and without radiating requirements, now needs to stop It is come air temperature and the size selection of battery-efficient operating temperature lower limit with power battery pack cooling line and according to crew module It is no to need crew module's air-supply to heat power battery pack.
1) power battery pack cooling line is disabled, i.e., is closed No. two magnetic valves 11, No.1 air door 19 is closed, No. two evaporations Device 15 does not freeze and closes No.1 air channel 17.
2) judge whether crew module 16 is higher than electricity come air temperature higher than default according to the numerical value of No. two temperature sensors 27 Pond efficient operation temperature upper limit value (definite value 3).
3) if crew module 16 carrys out air temperature and is higher than battery-efficient operating temperature lower limit (definite value 3), No. two air doors 20 are complete Open, enabling No. two air channels 18 makes passenger cabin carry out wind, and the pre- thermal cell of the rotating speed for adjusting induced draught fan 25 and air ejector fan 26 Group;If crew module 16, which carrys out air temperature, is less than battery-efficient operating temperature lower limit (definite value 3), closes No. two air doors 20 and close down Induced draught fan 25 and air ejector fan 26.
Step 3: if temperature control coefficients R is not zero, show that power battery pack there are radiating requirements, now need to parse battery case Required EAT TAir intake, and the EAT selection radiating mode according to needed for battery case radiates to power battery pack.
1) the EAT T according to needed for temperature control coefficients R parses battery caseAir intake.Analytic formula is as follows:
NcFor the scope of temperature control coefficients R,
Without unit;
Wherein,WithBeing need to be by testing the definite value between obtain 0 to 2, no unit;
Qmax=8, Qmin=0;
TmaxFor EAT maximum (definite value 4), 30 can be set to, unit is degree Celsius (DEG C);
TminFor EAT minimum value (definite value 5), 10 can be set to, unit is degree Celsius (DEG C);
TAir intakeFor EAT needed for power battery box, unit is degree Celsius (DEG C).
If 2) EAT T needed for the battery case through extrapolatingAir intakeHigher than as the temperature T in the first two number air channel 182, now, two Number evaporator 15 does not work still, and completely closes No.1 air door 19, and maintains turning for now induced draught fan 25 and air ejector fan 26 Speed.
3) for the purpose of energy-conservation, if as the EAT T in the first two number air channel 182Enter with what is extrapolated through temperature control coefficients R Air temperature TAir intakeWhen difference is less than 10%, No. two evaporators 15 will not be now made to work, it is appropriate to increase induced draught fan 25 and air draft wind The rotating speed of fan 26, air mass flow is improved to make up the deficiency of EAT.
If 4) as the EAT T in the first two number air channel 182With the EAT T extrapolated through temperature control coefficients RAir intakeDiffer greatly When 10%, forced heat radiation pattern will be opened, as shown in figure 4, during making EAT regulation, cooling system intake is all the time Keep constant:
Step 401, No. two evaporators 15 start to freeze, and adjust the intake in No.1 air channel 17 and No. two air channels 18, protect Demonstrate,prove the EAT T needed for power battery box 31Air intake:Open No.1 air channel 17 and be at maximum air intake state (No.1 air door 19 Aperture is maximum) and make No. two evaporators 15 start to freeze, while adjust No. two intakes of air channel 18 (No. two air doors 20 of regulation are opened Degree), now the leaving air temp of No. two evaporators 15 is T1(i.e. the gas temperature in No.1 air channel 17), the gas temperature in No. two air channels 18 Spend for T2, in order to be mixed into required EAT, regard air in air channel as perfect condition gas, gas density is considered as phase Deng and gas mixing before and after constancy of volume, it is as follows that formula can be obtained by The Ideal-Gas Equation:
V1T1+ V2T2=(V1+ V2)TAir intake,
Wherein Vi=vi×Ai, i=1,2, ViIt is air channel air mass flow, V1It is the air mass flow in No.1 air channel 17, V2It is two The air mass flow in number air channel 18, unit is m3/s;A1It is the sectional area in No.1 air channel 17, A2It is the sectional area in No. two air channels 18, it is single Position is m2;v1It is the wind speed in No.1 air channel 17, v2It is the wind speed in No. two air channels 18, unit is m/s.T1It is the gas in No.1 air channel 17 Temperature, T2It is the gas temperature in No. two air channels 18, unit is degree Celsius (DEG C).Because two air channels use same fan, So wind speed is equal, i.e. v1=v2.The maximum secting area sum in No.1 air channel 17 and No. two air channels 18 is equal to section in No. three air channels 23 Area, i.e. A1max+ A2max=A3, A3It is No. three duct cross-section products, unit is m2
Therefore the EAT T needed for battery caseAir intakeRegulation during, set No. two evaporators 15 first goes out wind-warm syndrome Spend T1(i.e. the gas temperature in No.1 air channel 17), then the EAT needed for adjust the aperture of No. two air doors 20, now one Number air door 19 keeps full-gear, forms required air quantity ratio.For example, required EAT is 20 degree, i.e. TAir intake=20, this When to adjust the leaving air temps of No. two evaporators 15 by No. two expansion valves 12 be 15 degree, i.e. T1=15, if now No. two air channels 18 Air themperature T2=30 degree, then can be obtained according to data above is brought into formula described above:
V1× 15+V2× 30=(V1+ V2)×20
V1=v1×A1
V2=v2×A2
It can obtainNow if the maximum secting area in No.1 air channel 17 and No. two air channels 18 is equal, therefore in No.1 wind During 19 standard-sized sheet of door, No. two apertures of air door 20 are 50%, could meet EAT demand.The leaving air temp model of No. two evaporators 15 It is 5 DEG C to 15 DEG C to enclose, therefore can have a variety of changes for different EAT demands, throttle opening size, but for section The consideration of energy, when demand EAT is higher than 15 DEG C, the leaving air temp of No. two evaporators 15 is 15 DEG C;When demand enters wind-warm syndrome When degree is less than 15 DEG C, the leaving air temp of No. two evaporators 15 is equal with demand EAT, and now No. two air channels 18, which are in, closes State, i.e., the aperture of No. two air doors 20 is zero.Wherein No.1 air door 19 and No. two air doors 20 are respectively by the He of No.1 stepper motor 21 No. two stepper motors 22 control, and air door can be that longitudinal direction can also be laterally around jackshaft direction of rotation.
Step 402, complete the EAT T needed for step 401 control battery caseAir intakeAfterwards, induced draught fan 25 and row are adjusted The rotating speed of wind fan 26, to ensure that the intake of battery case is constant:When No.1 air channel 17 and No. two 18 standard-sized sheets of air channel, fan turns Speed is definite value 8, and now intake is equal to the product (definite value 9) of wind speed and the sectional area in No. three air channels 23.In order to meet into wind-warm syndrome The demand of degree, air door need to start to act, i.e. the sectional area in No.1 air channel 17 and No. two air channels 18 changes, and Battery case enters Wind area (A1+ A2) also just corresponding reduction, in order to ensure that Battery case intake is still definite value 9, it is necessary to increase rotation speed of the fan, Now air velocity transducer 24 perceives the change of wind speed and then controls the rotating speed of fan in real time.The control of cooling system control unit 35 becomes Frequency device realizes fan speed-regulating.
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, again The evaporating temperature of the aperture and No. two evaporators 15 of No.1 air door 19 and No. two air doors 20 is controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, again to inhaling Wind fan 25 and air ejector fan 26 implement control.
5) finally will judge battery surface temperature whether the scope between the definite value 6 and definite value 7 being previously set, it is described fixed Value 7 is less than definite value 6, and temperature control coefficients R is modified if going beyond the scope, recalculates radiating requirements.
Fuzzy reasoning temperature control coefficients R described above and according to temperature control coefficients R calculate EAT carried out in BMS. Conditioning control unit and radiating control unit are passed to after drawing EAT, conditioning control unit is according to EAT demand root According to control rule control evaporator temperature, radiating control unit is according to current EAT demand, evaporator temperature and crew module Come air temperature control throttle opening and rotation speed of the fan.In addition the minimum EAT of power battery box (definite value 5), section in each air channel The parameter such as area and fan maximum (top) speed is required to be set using hydrodynamic simulation, i.e., according to the electrokinetic cell limit Maximum radiating requirements setting under condition of work.

Claims (9)

1. a kind of Vehicular dynamic battery group active air cooling cooling system, including crew module's air-conditioning system (100), it includes condenser (1), motor compressor (2), fluid reservoir (3), air blower (4), No.1 evaporator (5), No.1 electric expansion valve (9), No.1 temperature Sensor (10) is spent, condensator outlet is successively through No.1 electric expansion valve (9), No.1 evaporator (5), fluid reservoir (3), compressor Condenser inlet is entered back into after 2, forms the coolant circulation of crew module's air-conditioning system;
Characterized in that, the Vehicular dynamic battery group active air cooling cooling system also includes power battery pack cooling line, wind Road system and control system;The power battery pack cooling line includes being connected to the condenser (1) outlet and storage in turn No. two magnetic valves (11), No. two electric expansion valves (12) between flow container (3) entrance, No. two evaporators (15), No. two vapor pres- sures Force regulating valve (14), No. two check valves (13), the coolant circulation formed outside crew module's air-conditioning system;The ducting system includes No.1 air channel (17), No. two air channels (18) and No. three air channels (23), No. two air channel (18) entrances connect passenger cabin (16), and one Number air channel (17) entrance connects No. two evaporators (15), No.1 air channel (17) outlet and No. two common connections three in air channels (18) outlet Number air channel (23) entrance, the air inlet of No. three air channel (23) ends connection power battery boxes (31), the air inlet of Battery case Induced draught fan (25) is provided with, the opposite side of casing is provided with air outlet and air ejector fan (26);The control system includes logical Cross battery management system (32), conditioning control unit (34) and cooling system control that CAN communicates with entire car controller (33) Unit (35) processed.
A kind of 2. Vehicular dynamic battery group active air cooling cooling system as claimed in claim 1, it is characterised in that the occupant Cabin air-conditioning system (100) also includes No.1 check valve (6), No.1 evaporating pressure regulating valve (7) and No.1 magnetic valve (8), No.1 Magnetic valve (8) is arranged on before the condenser (1) outlet and No.1 electric expansion valve (9) entrance, the regulation of No.1 evaporating pressure Valve (7) entrance connection No.1 evaporator (5), No.1 evaporating pressure regulating valve (7) outlet connection No.1 check valve (6) entrance, one The outlet of number check valve (6) connects fluid reservoir (3) entrance.
A kind of 3. Vehicular dynamic battery group active air cooling cooling system as claimed in claim 1, it is characterised in that No. two air channels (18) porch is provided with No. two temperature sensors (27) and No. two air doors (20), No. two air doors (20) and No. two stepper motors (22) connected by spline;No.1 air door (19), No.1 air door (19) and No.1 stepper motor are provided with No.1 air channel (17) (21) connected by spline;The wind outlet of No. two evaporators (15) is provided with No. three temperature sensors (28), power battery box (31) air inlet is additionally provided with No. four temperature sensors (29) and air velocity transducer (24).
4. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 1, its feature exist In comprising the following steps:
Step 1: being combined using fuzzy control and leveling factor method, obtain system temperature control coefficients R and judge temperature control coefficients R Whether it is zero;
Step 2: when temperature control coefficients R is zero, show that power battery pack temperature is too low and without radiating requirements, now need to disable dynamic Power battery pack cooling line simultaneously chooses whether need according to crew module come the size of air temperature and battery-efficient operating temperature lower limit Crew module's air-supply is wanted to heat power battery pack;
Step 3: if temperature control coefficients R is not zero, show that power battery pack there are radiating requirements, now need to parse needed for battery case EAT TAir intake, and the EAT selection radiating mode according to needed for battery case radiates to power battery pack.
5. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 4, its feature exist In the step 1 is combined using fuzzy control and leveling factor method, is obtained system temperature control coefficients R, is specifically included following Process:
1) the compound influence coefficient Q of reflection power battery pack radiating requirements is determined according to fuzzy control method first:
1.1) input quantity and output quantity of fuzzy controller are determined:Input quantity is current power battery set charge/discharge current value and worked as Preceding battery surface temperature value, output quantity are compound influence coefficient Q;
1.2) input quantity of fuzzy controller, the value of output quantity and domain scope are determined;
1.3) input quantity and output quantity of fuzzy controller are blurred, determine charging and discharging currents, battery surface temperature with And compound influence coefficient Q quantizing factor, respectively Ki=2/C, Kt=1/10 and Kc=1;Wherein, C is charge-discharge magnification;It is real It is domain value that actual value, which is multiplied by quantizing factor,;Membership function is determined, i.e.,σ is respectively in function 0.15,3 and 0.3;C is normal distribution median, and span is the actual value of variable of above-mentioned fuzzy controller, and x values are System input value, as charge-discharge magnification and battery surface temperature;
1.4) fuzzy inference rule is determined, fuzzy matrix table is formulated based on fuzzy inference rule;
2) usage factor revised law will pass through above-mentioned steps 1) meeting for fuzzy control method determination, coefficient Q was influenceed successively by three Secondary amendment, obtain system temperature control coefficients R:
R=W × u1 × u2=Q × Ksoc × u1 × u2
Wherein,
Q is compound influence coefficient;
Ksoc is SOC correction factors;
W is temperature prediction coefficient, and span is determined by Q and Ksoc;
U1 is battery case internal temperature correction factor;
U2 is battery surface rate of temperature change correction factor.
6. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 4, its feature exist In, the step 2 when temperature control coefficients R is zero, power battery pack temperature is too low and control process during without radiating requirements is:
1) the power battery pack cooling line is disabled, No. two evaporators (15) are not freezed and close No.1 air channel (17);
2) judge that passenger cabin (16) comes whether air temperature is higher than default battery-efficient operating temperature lower limit;
3) passenger cabin if (16) carry out air temperature and are higher than battery-efficient operating temperature lower limit, enabling No. two air channels (18) makes Wind is carried out in passenger cabin (16), and adjusts the rotating speed preheating battery pack of induced draught fan (25) and air ejector fan (26);If in-car multiplies Member cabin (16) carrys out air temperature and is less than battery-efficient operating temperature lower limit, then closes No. two air channels (18) and close down induced draught fan And air ejector fan (26) (25).
7. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 4, its feature exist In if the step 3 temperature control coefficients R is not zero, power battery pack has control process during radiating requirements to be:
1) the EAT T according to needed for system temperature control coefficients R parses battery caseAir intake, analytic formula is as follows:
Wherein, NcFor the scope of temperature control coefficients R,
WithTake the definite value between 0 to 2;
Qmax=8, Qmin=0;
TmaxFor default EAT maximum, unit:℃;
TminFor default EAT minimum value, unit:℃;
TAir intakeFor EAT needed for battery case, unit:℃;
If 2) through above-mentioned steps 1) EAT T needed for the battery case that parsesAir intakeHigher than as the temperature T of the first two number air channel (18)2, Then No. two evaporators (15) do not work still, and completely close No.1 air door (19), maintain now induced draught fan (25) and air draft wind Fan the rotating speed of (26);
If 3) as the EAT T of the first two number air channel (18)2With through above-mentioned steps 1) the EAT T that extrapolatesAir intakeDifference is less than When 10%, i.e. (T2-TAir intake)/TAir intake<10%, do not make No. two evaporator (15) work, increase induced draught fan (25) and air draft wind still The rotating speed of (26) is fanned, improves air mass flow to make up the deficiency of EAT;
If 4) as the EAT T of the first two number air channel (18)2With through above-mentioned steps 1) EAT extrapolated differs by more than 10% When, i.e. (T2-TAir intake)/TAir intake>10%, then forced heat radiation pattern is opened, and ensure cooling system during EAT regulation Intake it is constant;
5) battery surface temperature will finally be judged whether in the range of being previously set, to system temperature control coefficient if going beyond the scope R is modified, and recalculates radiating requirements.
8. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 7, its feature exist In step 4) opens forced heat radiation pattern in the step 3, and ensures cooling system entering during EAT regulation The constant control process of air quantity is:
Step 401, No. two evaporators (15) start to freeze, and adjust the intake of No.1 air channel (17) and No. two air channels (18), Ensure the EAT T needed for battery caseAir intake:No.1 air channel (17) are opened to be at maximum air intake state and make No. two evaporations Device (15) starts to freeze, while adjusts No. two air channel (18) intakes;
Step 402, complete the EAT T needed for the step 401 control battery caseAir intakeAfterwards, adjust induced draught fan (25) and The rotating speed of air ejector fan (26), to ensure that the intake of battery case is constant;
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, again to one The evaporating temperature of the intake and No. two evaporators (15) of number air channel (17) and No. two air channels (18) is controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, again to air draught wind Fan (25) and air ejector fan (26) implements control.
9. a kind of control method of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 8, its feature exist In the EAT T in the step 401 needed for battery caseAir intakeRegulation during, first set No.1 air channel (17) gas Temperature, then EAT adjusts the aperture of No. two air doors (20) set in No. two air channels (18) needed for, and now one The No.1 air door (19) set in number air channel (17) keeps full-gear, forms required air quantity ratio;
It is as follows that formula can be obtained by The Ideal-Gas Equation:
V1T1+V2T2=(V1+V2)TAir intake,
Wherein, Vi=vi×Ai, i=1,2, ViIt is air channel air mass flow, V1It is the air mass flow of No.1 air channel (17), V2It is No. two The air mass flow in air channel (18), unit:m3/s;A1It is the sectional area of No.1 air channel (17), A2It is the section of No. two air channels (18) Product, unit:m2;v1It is the wind speed of No.1 air channel (17), v2It is the wind speed of No. two air channels (18), and v1=v2, unit:m/s;T1It is The gas temperature in No.1 air channel (17), T2It is the gas temperature of No. two air channels (18), unit:℃;A3It is No. three duct cross-section products, And A1max+A2max=A3, unit:m2
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