CN105522932A - Power battery pack active air cooling heat radiating system for vehicle and control method thereof - Google Patents

Power battery pack active air cooling heat radiating system for vehicle and control method thereof Download PDF

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Publication number
CN105522932A
CN105522932A CN201510962342.6A CN201510962342A CN105522932A CN 105522932 A CN105522932 A CN 105522932A CN 201510962342 A CN201510962342 A CN 201510962342A CN 105522932 A CN105522932 A CN 105522932A
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air
temperature
eat
power battery
cooling
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CN105522932B (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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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a power battery pack active air cooling heat radiating system for a vehicle, which is to realize that the heat radiating system changes with different states of a power battery in real time and the risk of over-high temperature of the battery pack is greatly reduced. The power battery pack active air cooling heat radiating system for the vehicle comprises a passenger compartment air conditioning system, a power battery pack cooling pipeline, an air duct system and a control system, wherein the power battery pack cooling pipeline comprises a No. 2 solenoid valve, a No. 2 electronic expansion valve, a No. 2 evaporator, a No. 2 evaporating pressure regulating valve and a No. 2 one-way valve, which are connected between an outlet of a condenser and an inlet of a liquid storage tank in sequence to form cooling liquid circulation outside the passenger compartment air conditioning system. An inlet of the air duct system is respectively connected with the No. 2 evaporator and an interior passenger compartment; an outlet of the air duct system is connected with a power battery box; and the control system comprises a battery management system, an air conditioning control unit and a heat radiating system control unit, which communicate with a vehicle control unit through CAN buses. The invention further discloses a control method for the power battery pack active air cooling heat radiating system for the vehicle.

Description

Vehicular dynamic battery group active air cooling cooling system and control method thereof
Technical field
The present invention relates to electronlmobil field, particularly relate to a kind of Vehicular dynamic battery group active air cooling cooling system and control method thereof.
Background technology
According to correlative study, charge-discharge magnification, electrokinetic cell SOC state and ambient temperature all have impact in various degree to electrokinetic cell internal resistance, and then affect temperature rise speed, and at south China, summer temp can reach 35 degree even higher above freezing, and battery heat-sinking capability is poor under these conditions, therefore needs to carry out quick heat radiating to battery, to reach ideal working temperature, avoid due to overheated the caused adverse consequences of battery pack temperature.So according to the difference of electrokinetic cell mode of operation, need to take different heat radiation strategies.And when battery surface temperature is too high, internal temperature of battery often exceedes permissible upper already, therefore easily because the too high battery life that causes of battery temperature declines.Battery heats up mainly because the internal resistance of cell increases, and the internal resistance of cell refers to that battery operationally, and electric current flows through the resistance suffered by inside battery, is made up of ohmic internal resistance and polarization resistance.
At present, the cooling method of electronlmobil electrokinetic cell used is mainly divided into liquid cooling and air-cooled.Liquid cooling efficiency is high, but complex structure and keep in repair constant.Gas cooling mostly be natural wind cooling and force-air cooling but, the latter's cooling performance is obviously better than the former.Wind is forced to realize from crew module or external environment air draught mainly through fan.
Fuzzy control utilizes the basic thought of fuzzy mathematics and theoretical control method.In traditional control field, the whether accurate of control system dynamic mode is that impact controls good and bad key.But the system that the system or be difficult to for complexity accurately describes, then seem helpless.Therefore just attempt with fuzzy mathematics to process these control problem." fuzzy " is human perception all things on earth, obtains knowledge, thinking reasoning, the key character of decision implement.The information capacity that " fuzzy " has than " clear " is larger, and intension is abundanter, more meets objective world.Fuzzy control is in fact a kind of nonlinear Control, is subordinated to the category of Based Intelligent Control.One large feature of fuzzy control is existing systematized theory, has again a large amount of actual application background.
Electric automobile air-conditioning system many employings motor driven compressor, it utilizes the electric energy of electrokinetic cell to freeze for vehicle occupant compartment.The leaving air temp of the evaporator in air-conditioning regulates and realizes by controlling evaporating pressure, namely regulates the force value of low pressure gauge, the height by regulating the aperture of heating power expansion valve (or flow regulating valve) to regulate low pressure in operation.Expansion valve opening is large, and evaporating temperature raises, and low pressure also raises, and refrigerating capacity will increase; If expansion valve opening is little, evaporating temperature reduces, and low pressure also reduces, and refrigerating capacity will reduce.
The cooling system of current driving force battery can only realize the radiating effect fixed, cannot according to the mode of operation of electrokinetic cell and physical condition real-time change, once temperature of powered cell occurs that divergent trend cannot be lowered the temperature in time, therefore radiating effect is poor.
Summary of the invention
The object of the invention is exactly a kind of Vehicular dynamic battery group active air cooling cooling system provided to improve Vehicular dynamic battery group radiating efficiency, to realize the real-time change of cooling system with electrokinetic cell different conditions, significantly reduce the too high risk of battery pack temperature.
The object of the invention is to be realized by following scheme, by reference to the accompanying drawings:
The invention provides a kind of Vehicular dynamic battery group active air cooling cooling system, comprise crew module's a/c system 100, it comprises condenser 1, motor driven compressor 2, fluid reservoir 3, blowing engine 4, evaporator 5, electric expansion valve 9, temperature sensor 10, the outlet of condenser 1 enters condenser inlet more successively after an electric expansion valve 9, evaporator 5, fluid reservoir 3, compressor 2, forms the cooling-liquid cycle of crew module's a/c system;
Described Vehicular dynamic battery group active air cooling cooling system also comprises power battery pack cooling line, ducting system and control system; Described power battery pack cooling line comprises and is connected to described condenser 1 in turn and exports No. two electromagnetic valves 11, No. two electric expansion valves 12, No. two evaporators 15, No. two evaporating pressure regulating valves 14, No. two check valves 13 between fluid reservoir 3 entrance, forms the cooling-liquid cycle outside crew module's a/c system; The entrance of described ducting system connects No. two evaporators 15 and passenger cabin 16 respectively, and the outlet of ducting system connects electrokinetic cell casing 31; Described control system comprises the battery management system 32, conditioning control unit 34 and the cooling system control unit 35 that are communicated with entire car controller 33 by CAN (controller local area network).
Described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, described crew module's a/c system 100 also comprises a check valve 6, evaporating pressure regulating valve 7 and an electromagnetic valve 8, electromagnetic valve 8 is arranged on described condenser 1 and exports and before electric expansion valve 9 entrance, evaporating pressure regulating valve 7 entrance connects an evaporator 5, an evaporating pressure regulating valve 7 exports connection check valve 6 entrance, and a check valve 6 exports and connects described fluid reservoir 3 entrance.
Described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, described ducting system comprises air channel 18, No. 17, two, an air channel and No. three air channels 23, No. two air channel 18 entrances connect passenger cabin 16, air channel 17 entrance connects No. two evaporators 15, air channel 17 outlet exports with No. two air channels 18 and is jointly connected No. three air channel 23 entrances, No. three air channel 23 ends connect the ventilation inlet of power battery box 31, the air inlet of power battery box 31 is provided with induced draught fan 25, and the opposite side of casing is provided with air outlet and air ejector fan 26.Power battery pack is placed in electrokinetic cell casing 31.
Described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, the entrance in No. two air channels 18 is provided with No. two temperature sensors 27 and No. two air doors 20, No. two air doors 20 and No. two stepping motors 22 and passes through spline joint; An air door 19, air door 19 is provided with and a stepping motor 21 passes through spline joint in an air channel 17; The wind outlet of No. two evaporators 15 is provided with No. three temperature sensors 28, and the air inlet of Battery case is also provided with No. four temperature sensors 29 and air velocity transducer 24.
The present invention provides a kind of control method of Vehicular dynamic battery group active air cooling cooling system simultaneously, Vehicular dynamic battery group active air cooling cooling system comprises crew module's a/c system 100, power battery pack cooling line, ducting system and control system, the condenser 1 that described power battery pack cooling line is connected to described crew module's a/c system 100 exports between fluid reservoir 3 entrance, it comprises No. two evaporators 15, described ducting system comprises an air channel 17, No. two air channels 18 and No. three air channels 23, No. two air channel 18 entrances connect passenger cabin 16, air channel 17 entrance connects No. two evaporators 15, air channel 17 outlet exports with No. two air channels 18 and is jointly connected No. three air channel 23 entrances, No. three air channel 23 ends connect the ventilation inlet of power battery box 31, the air inlet of Battery case is provided with induced draught fan 25, the opposite side of Battery case is provided with air ejector fan 26,
This control method comprises the following steps:
Step one, utilize fuzzy control and leveling factor method to combine, obtain system temperature control coefficients R and also judge whether temperature control coefficients 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 need inactive power battery pack cooling line and select to blow the need of crew module to heat power battery pack according to the size that crew module comes air temperature and battery-efficient operating temperature lower limit;
If step 3 temperature control coefficients R is non-vanishing, show that power battery pack has radiating requirements, now need to resolve the EAT T needed for battery box air intake, and the EAT needed for battery box selects radiating mode to dispel the heat to power battery pack.
The control method of described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, described step one utilizes fuzzy control and leveling factor method to combine, and obtains system temperature control coefficients R, specifically comprises following process:
1) first determine according to fuzzy control method the compound influence coefficient Q reflecting power battery pack radiating requirements:
1.1) input and the output of fuzzy controller is determined: input is current power battery set charge/discharge current value and present battery surface temperature value, and output is compound influence coefficient Q;
1.2) input of fuzzy controller, the value of output and domain scope is determined;
1.3) obfuscation is carried out to the input of fuzzy controller and output, determine the quantizing factor of charging and discharging currents, battery surface temperature and compound influence coefficient Q, be respectively Ki=2/C, Kt=1/10 and Kc=1.C is current charge-discharge magnification.Actual value is multiplied by quantizing factor and is domain value; Determine membership function, namely in function, σ is respectively 0.15,3 and 0.3; C is normal distribution intermediate value, and span is the actual value of variable of above-mentioned fuzzy controller, and x value is system input value, is charge-discharge magnification and battery surface temperature;
1.4) determine fuzzy inference rule, formulate fuzzy matrix table based on fuzzy inference rule;
2) factor of utilization revised law will through above-mentioned steps 1) the influence coefficient Q that meets that determines of fuzzy control method revises through three times successively, obtains system temperature control coefficients R.
R＝W×u1×u2＝Q×Ksoc×u1×u2
Wherein,
Q is compound influence coefficient;
Ksoc is SOC coefficient of correction;
W is temperature prediction coefficient, and span is determined by Q and Ksoc;
U1 is battery box internal temperature coefficient of correction;
U2 is battery surface rate of temperature change coefficient of correction.
The control method of described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, described step 2, when temperature control coefficients R is zero, shows that power battery pack temperature is too low and without control process during radiating requirements is:
1) inactive described power battery pack cooling line, No. two evaporators 15 do not freeze and cut out an air channel 17;
2) judge that air temperature is carried out higher than the battery-efficient operating temperature lower limit (definite value 3) preset in passenger cabin 16 whether;
3) if air temperature is carried out higher than battery-efficient operating temperature lower limit (definite value 3) in passenger cabin 16, then enable No. two air channels 18 and be the wind comes from passenger cabin 16, and regulate the rotating speed preheating battery pack of induced draught fan 25 and air ejector fan 26; If air temperature is carried out lower than battery-efficient operating temperature lower limit (definite value 3) in passenger cabin 16, then close No. two air channels 18 and close down induced draught fan 25 and air ejector fan 26.
The control method of described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, if described step 3 temperature control coefficients R is non-vanishing, shows that power battery pack has control process during radiating requirements to be:
1) the EAT T needed for battery box is resolved according to system temperature control coefficients R air intake, analytic formula is as follows:
Wherein, N cfor the scope of temperature control coefficients R,
N c = k soc max × Q max × u 1 max × u 2 max - k soc min × Q min × u 1 min × u 2 min ;
with get the definite value between 0 to 2;
Q max＝8，Q min＝0； u 1 max = 2 , u 1 min = 0 ; u 2 m a x = 2 , u 2 min = 0 ;
Q maxfor the EAT maxim preset, unit: DEG C;
T minfor the EAT minimum value preset, unit: DEG C;
T air intakeeAT needed for battery box, unit: DEG C.
2) if through above-mentioned steps 1) EAT T needed for the battery box that parses air intakehigher than the temperature T when the first two number air channel 18 2, then No. two evaporators 15 still do not work, and close an air door 19 completely, maintain the rotating speed of now induced draught fan 25 and air ejector fan 26;
3) if work as the EAT T in the first two number air channel 18 2with through above-mentioned steps 1) the EAT T that extrapolates air intakewhen difference is less than 10%, i.e. (T 2-T air intake)/T air intake<10%, does not still make No. two evaporators 15 work, and increases the rotating speed of induced draught fan 25 and air ejector fan 26, improves charge air to make up the deficiency of EAT;
4) if work as the EAT T in the first two number air channel 18 2with through above-mentioned steps 1) EAT extrapolated differ by more than 10% time, i.e. (T 2-T air intake)/T air intake>10%, then open forced heat radiation pattern, and ensure that the intake of cooling system in EAT control process is constant;
5) finally by judging battery surface temperature whether in the scope of setting in advance, if go beyond the scope, system temperature control coefficients R being revised, recalculates radiating requirements.
The control method of described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, described step 3 kind step 4) open forced heat radiation pattern, and ensure that the control process that the intake of cooling system in EAT control process is constant is:
Step 401, No. two evaporators 15 start refrigeration, and regulate the intake in an air channel 17 and No. two air channels 18, ensure the EAT T needed for battery box air intake: open an air channel 17 and make it be in maximum air intake state and make No. two evaporators 15 start refrigeration, regulate No. two air channel 18 intakes simultaneously;
Step 402, the EAT T completing described step 401 and control needed for battery box air intakeafter, regulate the rotating speed of induced draught fan 25 and air ejector fan 26, constant to ensure the intake of battery box;
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, then again the intake in an air channel 17 and No. two air channels 18 and No. two evaporators 15 are controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, then again implement to control to induced draught fan 25 and air ejector fan 26.
The control method of described a kind of Vehicular dynamic battery group active air cooling cooling system, wherein, the EAT T in described step 401 needed for battery box air intakecontrol process in, first the gas temperature in an air channel 17 is set, then regulate the aperture of No. two air doors 20 arranged in No. two air channels 18 according to required EAT, the air door 19 now arranged in an air channel 17 keeps full-gear, the air quantity ratio needed for formation;
Can formula be obtained as follows by the Ideal-Gas Equation:
V 1t 1+ V 2t 2=(V 1+ V 2) T air intake,
Wherein, V i=v i× A i, i=1,2, V iair channel charge air, V 1the charge air in an air channel 17, V 2the charge air in No. two air channels 18, unit: m 3/ s; A 1the sectional area in an air channel 17, A 2the sectional area in No. two air channels 18, unit: m 2; v 1the wind speed in an air channel 17, v 2the wind speed in No. two air channels 18, unit: m/s, and v 1=v 2; T 1the gas temperature in an air channel 17, T 2the gas temperature in No. two air channels 18, unit: DEG C; A 3that No. three duct cross-sections amass, and A 1max+ A 2max=A 3, unit: m 2.
Compared with prior art, advantage of the present invention is:
Electrokinetic cell wind-cooling heat dissipating operating modes all on current market is all comparatively single, and when electrokinetic cell state changes, unavoidable radiating effect is poor.By above technical scheme, the present invention the factor such as physical condition and discharge and recharge operating mode current according to electrokinetic cell can regulate electrokinetic cell cooling system in real time, realize, under the prerequisite as far as possible reducing energy ezpenditure, improving electrokinetic cell radiating effect, and then improve electrokinetic cell service life.And control method provided by the invention can before electrokinetic cell temperature rise arrives battery surface (being detected by temperature sensor), battery temperature rise is suppressed, there is certain temperature prediction effect, and then significantly reduce because temperature is too high and cause the probability of electrokinetic cell internal chemical composition generation irreversible change.The present invention can realize crew module refrigeration and power battery pack cooling line non-interference, and when crew module's temperature is lower, make full use of the Air flow power battery pack of crew module, as far as possible minimizing No. two evaporators and the consumed power of fan in battery pack heat radiation, therefore the present invention can practice every conceivable frugality electric energy under the prerequisite ensureing radiating effect.
Accompanying drawing explanation
Fig. 1 is Vehicular dynamic battery group active air cooling cooling system structure schematic diagram
Fig. 2 is control flow chart of the present invention
Fig. 3 is that temperature control coefficient calculates diagram of circuit
Fig. 4 is forced heat radiation mode logic diagram of circuit
In figure:
1, condenser 2, motor driven compressor 3, fluid reservoir 4, blowing engine 5, an evaporator 6, a check valve 7, an evaporating pressure regulating valve 8, an electromagnetic valve 9, an electric expansion valve 10, a temperature sensor 11, No. two electromagnetic valves 12, No. two electric expansion valves 13, No. two check valves 14, No. two evaporating pressure regulating valves 15, No. two evaporators 16, crew module 17, an air channel 18, No. two air channels 19, an air door 20, No. two air doors 21, a stepping motor 22, No. two stepping motors 23, No. three air channels 24, air velocity transducer 25, induced draught fan 26, air ejector fan 27, No. two temperature sensors 28, No. three temperature sensors 29, No. four temperature sensors 30, No. five temperature sensors 31, 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 a/c system
Detailed description of the invention
The object of the invention is exactly to improve electric automobile power battery group radiating efficiency, and a kind of power battery pack active air cooling cooling system based on fuzzy control provided, to realize the real-time change of cooling system with electrokinetic cell different conditions.
Be described technical scheme of the present invention below in conjunction with accompanying drawing, described by accompanying drawing is only a part for invention instead of whole embodiments.
As shown in Figure 1, for a kind of Vehicular dynamic battery group active air cooling cooling system provided by the invention, (condenser 1 is comprised comprising crew module's a/c system 100, motor driven compressor 2, fluid reservoir 3, blowing engine 4, an evaporator 5, a check valve 6, an evaporating pressure regulating valve 7, an electromagnetic valve 8, an electric expansion valve 9, a temperature sensor 10, a wherein check valve 6, an evaporating pressure regulating valve 7, an electromagnetic valve 8 belongs to newly-increased parts on traditional crew module's a/c system basis), install power battery pack cooling line on this basis additional, comprise No. two electromagnetic valves 11, No. two electric expansion valves 12, No. two check valves 13, No. two evaporating pressure regulating valves 14, No. two evaporators 15.In addition described system also comprises ducting system and control system, ducting system comprises an air channel 17, No. two air channels 18, No. three air channels 23, a stepping motor 21, No. two stepping motors 22, No. two temperature sensors 27, No. three temperature sensors 28, No. four temperature sensors 29, No. five temperature sensors 30, air velocity transducer 24, an air door 19, No. two air doors 20, induced draught fan 25 and air ejector fan 26, control system comprises 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 all communicated with entire car controller (VCU) 33 by CAN.
In system provided by the present invention, specifically be implemented as follows, on conventional electric air-conditioning basis, the exit of car outside condenser 1, refrigerant fluid flows to and is divided into two, article one, be traditional crew module refrigeration, namely condenser 1 connects the entrance of an electromagnetic valve 8, the outlet of an electromagnetic valve 8 connects electric expansion valve 9 entrance, and an electric expansion valve 9 exports connection evaporator 5; Another provides cooling air for power battery pack, and namely condenser 1 exports connection No. two electromagnetic valve 11 entrances, the outlet of No. two electromagnetic valves 11 connects No. two electric expansion valve 12 entrances, and No. two expansion valves 12 export connection No. two evaporators 15.Each refrigeration pipe, connects an evaporating pressure regulating valve 7 and No. two evaporating pressure regulating valves 14 respectively after evaporator, and this is because the evaporating temperature of two evaporators is different, needs to regulate line pressure to return same pipeline more respectively.Before returning fluid reservoir, two pipelines need to connect a check valve 6 and No. two check valves 13 respectively, and prevent when a pipeline job, refrigerant fluid is back to another pipeline.The unified entrance connecting fluid reservoir 3 of last two pipelines, compresses through compressor 2, condenser 1 condensation enters next refrigerating cycle.
Power battery pack adopts force-air cooling form, and cooling air source has two.One be the wind comes from for crew module 16, i.e. No. two air channels 18; It two is that No. two evaporators 15 be the wind comes from, i.e. an air channel 17; Then in No. three air channels 23, form mixing wind, induced draught fan 25 will mix wind and send into power battery box 31, for the power battery pack being placed on box house provides cooling.Discharge power battery box 31 for the ease of cooling air, casing exhaust outlet is provided with air ejector fan 26.
No. three air channels 23, are the mixing of the wind comes from by an air channel 17 and No. two air channels 18.Wherein No. two air channels 18 connect passenger cabin 16, No. two temperature sensors 27 and No. two air doors 20 are provided with in the entrance in No. two air channels 18, be respectively used to monitoring carry out air temperature and control No. two air channel 18 apertures, No. two air doors 20 and No. two stepping motors 22 are by spline joint, and No. two stepping motors 22 drive No. two air doors 20 to rotate; The entrance in an air channel 17 connects No. two evaporators 15, the wind outlet of No. two evaporators 15 is provided with No. three temperature sensors 28, object is the leaving air temp of collection No. two evaporators, in addition an air door 19 is also provided with in an air channel 17, for controlling the aperture in an air channel 17, an air door 19 and a stepping motor 21 are also by spline joint, and a stepping motor 21 drives an air door 19 to rotate.No. three air channel 23 ends connect the ventilation inlet of power battery box 31, the air inlet of power battery box 31 is provided with induced draught fan 25, No. four temperature sensors 29 and air velocity transducer 24, is respectively used to send in casing by cooling and mixing wind, monitor battery box EAT and monitoring intake.Object for convenience of description, follow-up described power battery box EAT is all referred to as EAT.The opposite side of power battery box 31 is provided with air outlet and air ejector fan 26, is convenient to cooling air and discharges smoothly, and box house is provided with No. five temperature sensors 30 in addition, for gathering battery box ambient temperature.
In described wind-cooling heat dissipating system, an electromagnetic valve 8, No. two electromagnetic valves 11, electric expansion valve 9, No. two electric expansion valves 12, evaporator 5, No. two evaporators 15, blowing engine 4, temperature sensor 10, No. three temperature sensors 28 etc. all belong to air conditioning system components, and therefore the above parts controls by conditioning control unit 34; No. two temperature sensors 27, No. four temperature sensors 29, wind stepping motor 21, No. two stepping motors 22, air velocity transducers 24 control by cooling system control unit 33; The data acquisition of No. five temperature sensors 30 and the collection of battery surface temperature complete by battery management system (BMS) 32.
The control method of a kind of Vehicular dynamic battery group active air cooling cooling system of the present invention, as shown in Figure 2, comprises the following steps:
Step one, obtain system temperature control coefficients R judge whether temperature control coefficients R is zero, as shown in Figure 3.
Temperature control coefficients R is determined by the size of the internal resistance of cell and the inner natural heat-exchange situation of Battery case, and then reaction cell forced heat radiation demand size, radiating requirements is embodied by EAT, such as when temperature control coefficients R value is larger, under showing current state, the internal resistance of cell is larger, battery radiating requirements is higher, and therefore required EAT is lower, and vice versa.Utilize fuzzy control and leveling factor method to combine, obtain temperature control coefficients R, it can go out radiating requirements and the battery temperature rise trend of current power battery pack by active reaction, and unconventional according to battery surface temperature feedback radiating requirements.Detailed process is as follows:
1) first according to fuzzy control method determination compound influence coefficient Q, compound influence coefficient Q is also the amount of reaction power battery pack radiating requirements.
1.1) determine input and the output of fuzzy controller, input is current power battery set charge/discharge current value and present battery surface temperature value.Wherein battery surface temperature utilizes the sensor measurement being attached to battery cell surface, final input value is the current all monomer temperature peaks recorded, battery set charge/discharge current value obtains from battery management system (BMS) 32, utilizes charge-discharge magnification to represent current value size.Output is compound influence coefficient Q.
1.2) input of fuzzy controller, the value of output and domain scope is determined.Charging and discharging currents value scope, battery surface range of temperatures and compound influence coefficient Q scope, value is 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}, concrete actual value is { 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 is charge-discharge magnification, such as 1C electric discharge is theoretical current capacity of cell discharged in a hour, unit is ampere (A), battery surface temperature unit is degree Celsius (DEG C), compound influence coefficient Q is without unit.And then { 0,1,2,3,4,5, the 6}, {-2 ,-1,0,1,2,3,4,5} and [0,1,2,3,4,5,6,7,8] that determines that domain value is respectively.
1.3) obfuscation is carried out to the input of fuzzy controller and output, determine the quantizing factor of charging and discharging currents, battery surface temperature and compound influence coefficient Q, be respectively Ki=2/C, Kt=1/10 and Kc=1.Actual value is multiplied by quantizing factor and is domain value; Determine membership function, in the present invention, these three variablees of charging and discharging currents, battery surface temperature and compound influence coefficient Q adopt normal distribution type (Gaussian bases) subordinate function, namely in function, σ is respectively 0.15,3 and 0.3, without unit; C is normal distribution intermediate value, and span is the actual value of variable of above-mentioned fuzzy controller, and unit is the same, and x value is system input value, is charge-discharge magnification and battery surface temperature, span and unit same as above.
1.4) determine fuzzy inference rule, when battery surface temperature is within the scope of-20 to 20 degree, think and to reduce gradually with the temperature rising internal resistance of cell, therefore radiating requirements reduces gradually; When battery surface temperature be in 20 to 40 spend time, think battery temperature be suitable for; When battery surface temperature is higher than 40 degree, think that the higher need of temperature dispel the heat.For charging and discharging currents, think that charge-discharge magnification is higher, then the internal resistance of cell is larger, and therefore radiating requirements is higher, and namely compound influence coefficient Q is larger.Then based on above Rulemaking fuzzy matrix table.Regular matrix table is as follows:
1.5) gravity model appoach defuzzification exports compound influence coefficient Q.
2) because compound influence coefficient Q still can not react the radiating requirements of present battery and the temperature rise trend of battery preferably, therefore will revise this coefficient.Correction is divided into three times:
2.1) first time correction: first time is revised according to the current state-of-charge of battery (SOC state), main consideration SOC state is on the impact of the internal resistance of cell, namely according to SOC state, be divided into internal resistance of cell state six stages, namely discharge operating mode and charging operating mode under, battery pack SOC divides following three kinds of states: higher than definite value 1, or lower than definite value 2, or higher than definite value 2 and lower than definite value 1 (above-mentioned definite value 2 is less than definite value 1), the internal resistance of cell is different when battery SOC is under above-mentioned three kinds of different conditions, therefore directly affects temperature rise trend.Such as when battery is in electric discharge operating mode, and when SOC is between definite value 2 and definite value 1, now think, the internal resistance of cell is minimum, and therefore adjusted coefficient K soc2 gets minimum value; When battery is in charging operating mode, and SOC lower than definite value 2 time, now think that the internal resistance of cell is maximum, therefore adjusted coefficient K soc4 gets maxim, remaining Ksoc value by that analogy, in the present invention, Ksoc span is 0 to 2, without unit, specifically need obtain internal resistance rule by the experiment of different types of electrokinetic cell and then determine six kinds of values of Ksoc.Compound influence coefficient is multiplied with Ksoc and obtains temperature prediction coefficient W, and this coefficient is still for calculating the intermediate value in temperature control coefficients R process.
2.2) second time is revised: now correction is the ambient temperature T according to battery box inside, if rule has the effect suppressing battery temperature rise when to be battery box temperature lower, namely battery natural cooling effect is better, and the radiating requirements therefore for cooling system is less, and vice versa.The coefficient of correction of battery box interior environment temperature to radiating requirements is set to u1.The scope of T is-20 DEG C to 40 DEG C, and when T value is-20 to 0 DEG C, u1 is set to 0.When T value is from 0 DEG C to 40 DEG C, often increase by 1 DEG C of corresponding u1 value is 0 to 2, u1 from 0 increase by 0.05, u1 span is coefficient of correction, therefore without unit.
2.3) revise for the third time: now revising is according to battery surface rate of temperature change Δ t, is just if rule is rate of temperature change and comparatively greatly, illustrates that radiating effect is poor, need increase radiating requirements; If rate of temperature change is for negative and absolute value is comparatively large, illustrates that heat radiation is excessive, for preventing battery temperature too low and for energy-conservation object, now will the radiating requirements of reduction to cooling system.The coefficient of correction of battery surface rate of temperature change to radiating requirements is set to u2.When rate of change Δ t is from-1 DEG C/s to 1 DEG C/s, often increase by 0.1 DEG C/s, u2 is 0 to 2, u2 from the span of zero corresponding increase by 0.1, u2 is coefficient of correction, therefore without unit.
2, the temperature control coefficients R of system can be obtained through above-mentioned steps and judge whether the temperature control coefficients R obtained is zero.The calculating formula of temperature control 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 coefficient of correction, 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 box internal temperature coefficient of correction, and span is 0 to 2;
U2 is battery surface rate of temperature change coefficient of correction, 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 need inactive power battery pack cooling line and select to blow the need of crew module to heat power battery pack according to the size that crew module comes air temperature and battery-efficient operating temperature lower limit.
1) inactive power battery pack cooling line, close by No. two electromagnetic valves 11, an air door 19 is closed, and No. two evaporators 15 do not freeze and cut out an air channel 17.
2) according to the numerical value of No. two temperature sensors 27 judge crew module 16 come air temperature whether higher than preset higher than battery-efficient operating temperature lower limit (definite value 3).
3) if crew module 16 carrys out air temperature higher than battery-efficient operating temperature lower limit (definite value 3), then No. two air door 20 standard-sized sheets, enabling No. two air channels 18 makes passenger cabin the wind comes from, and regulates the rotating speed preheating battery pack of induced draught fan 25 and air ejector fan 26; If crew module 16 carrys out air temperature lower than battery-efficient operating temperature lower limit (definite value 3), then close No. two air doors 20 and close down induced draught fan 25 and air ejector fan 26.
If step 3 temperature control coefficients R is non-vanishing, show that power battery pack has radiating requirements, now need to resolve the EAT T needed for battery box air intake, and the EAT needed for battery box selects radiating mode to dispel the heat to power battery pack.
1) the EAT T needed for battery box is resolved according to temperature control coefficients R air intake.Analytic formula is as follows:
N cfor the scope of temperature control coefficients R,
N c = k soc max &times; Q max &times; u 1 max &times; u 2 max - k soc min &times; Q min &times; u 1 min &times; u 2 min , Without unit;
Wherein, with be need obtain by experiment 0 to 2 between definite value, without unit;
Q max＝8，Q min＝0； u 1 max = 2 , u 1 min = 0 ; u 2 m a x = 2 , u 2 min = 0 ;
T maxfor EAT maxim (definite value 4), can be set to 30, unit is degree Celsius (DEG C);
T minfor EAT minimum value (definite value 5), can be set to 10, unit is degree Celsius (DEG C);
T air intakeeAT needed for power battery box, unit is degree Celsius (DEG C).
2) if EAT T needed for the battery box through extrapolating air intakehigher than the temperature T when the first two number air channel 18 2, now, No. two evaporators 15 still do not work, and close an air door 19 completely, and maintain the rotating speed of now induced draught fan 25 and air ejector fan 26.
3) for energy-conservation object, if work as the EAT T in the first two number air channel 18 2with the EAT T extrapolated through temperature control coefficients R air intakewhen difference is less than 10%, No. two evaporators 15 now will not be made to work, suitably increase the rotating speed of induced draught fan 25 and air ejector fan 26, improve charge air to make up the deficiency of EAT.
4) if work as the EAT T in the first two number air channel 18 2with the EAT T extrapolated through temperature control coefficients R air intakewhen differing by more than 10%, will open forced heat radiation pattern, as shown in Figure 4, make in EAT control process, cooling system intake remains constant:
Step 401, No. two evaporators 15 start refrigeration, and regulate the intake in an air channel 17 and No. two air channels 18, ensure the EAT T needed for power battery box 31 air intake: open an air channel 17 and make it be in maximum air intake state (air door 19 aperture is maximum) and make No. two evaporators 15 start refrigeration, regulate No. two air channel 18 intakes (regulating the aperture of No. two air doors 20), now the leaving air temp of No. two evaporators 15 is T simultaneously 1(i.e. the gas temperature in an air channel 17), the gas temperature in No. two air channels 18 is T 2, in order to be mixed into required EAT, all regard air in air channel as perfect condition gas, gas density is considered as equal and constancy of volume before and after gas and vapor permeation, can obtain formula as follows by the Ideal-Gas Equation:
V 1t 1+ V 2t 2=(V 1+ V 2) T air intake,
Wherein V i=v i× A i, i=1,2, V iair channel charge air, V 1the charge air in an air channel 17, V 2be the charge air in No. two air channels 18, unit is m 3/ s; A 1the sectional area in an air channel 17, A 2be the sectional area in No. two air channels 18, unit is m 2; v 1the wind speed in an air channel 17, v 2be the wind speed in No. two air channels 18, unit is m/s.T 1the gas temperature in an air channel 17, T 2be the gas temperature in No. two air channels 18, unit is degree Celsius (DEG C).Because two air channels adopt same fan, so wind speed is equal, i.e. v 1=v 2.The maximum secting area sum in an air channel 17 and No. two air channels 18 equals the sectional area in No. three air channels 23, i.e. A 1max+ A 2max=A 3, A 3be that No. three duct cross-sections amass, unit is m 2.
Therefore the EAT T needed for battery box air intakecontrol process in, first set the leaving air temp T of No. two evaporators 15 1(i.e. the gas temperature in an air channel 17), then regulates the aperture of No. two air doors 20 according to required EAT, now an air door 19 keeps full-gear, the air quantity ratio needed for formation.Such as, required EAT is 20 degree, i.e. T air intake=20, now regulate the leaving air temp of No. two evaporators 15 to be 15 degree by No. two expansion valves 12, i.e. T 1=15, if the air themperature T in now No. two air channels 18 2=30 degree, so can obtain according to bringing above data into formula mentioned above:
V 1×15＋V 2×30＝(V 1＋V 2)×20
V 1＝v 1×A 1
V 2＝v 2×A 2
Can obtain if now the maximum secting area in an air channel 17 and No. two air channels 18 is equal, therefore when air door 19 standard-sized sheet, No. two air door 20 apertures are 50%, could meet EAT demand.The leaving air temp scope of No. two evaporators 15 is 5 DEG C to 15 DEG C, therefore for different EAT demands, throttle opening size can have multiple change, but for energy-conservation consideration, when demand EAT is higher than 15 DEG C, the leaving air temp of No. two evaporators 15 is 15 DEG C; When demand EAT is lower 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 are in closed condition, and namely the aperture of No. two air doors 20 is zero.Wherein an air door 19 and No. two air doors 20 are controlled by a stepping motor 21 and No. two stepping motors 22 respectively, and air door can be longitudinally also can for horizontal around tween drive shaft hand of rotation.
Step 402, control the EAT T needed for battery box at completing steps 401 air intakeafter, regulate the rotating speed of induced draught fan 25 and air ejector fan 26, constant to ensure the intake of battery box: when an air channel 17 and No. two air channel 18 standard-sized sheets, rotation speed of the fan is definite value 8, now intake equals the product (definite value 9) of the sectional area in wind speed and No. three air channels 23.In order to meet the demand of EAT, air door need start action, and namely the sectional area in an air channel 17 and No. two air channels 18 changes, the incoming air area (A of Battery case 1+ A 2) also just corresponding reduction, in order to ensure that Battery case intake is still definite value 9, just need to increase rotation speed of the fan, the change of now air velocity transducer 24 perception wind speed and then the real-time rotating speed controlling fan.Cooling system control unit 35 controls frequency converter and realizes fan speed-regulating.
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, then again an air door 19 and the aperture of No. two air doors 20 and the evaporating temperature of No. two evaporators 15 are controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, then again implement to control to induced draught fan 25 and air ejector fan 26.
5) finally will judge the battery surface temperature scope whether between the definite value 6 and definite value 7 of setting in advance, described definite value 7 is less than definite value 6, if go beyond the scope, revises, recalculate radiating requirements to temperature control coefficients R.
The above fuzzy reasoning temperature control coefficients R and according to temperature control coefficients R calculate EAT all carry out in BMS.Conditioning control unit and radiating control unit is passed to after drawing EAT, conditioning control unit controls evaporator temperature according to EAT demand according to control law, and radiating control unit carrys out air temperature according to current EAT demand, evaporator temperature and crew module and controls throttle opening and rotation speed of the fan.In addition the parameter such as the sectional area in the minimum EAT of power battery box (definite value 5), each air channel and fan maximum speed all needs to utilize hydrodynamic simulation to set, namely according to the maximum radiating requirements setting under electrokinetic cell limit service conditions.

Claims (10)

1. a Vehicular dynamic battery group active air cooling cooling system, comprise crew module's a/c system (100), it comprises condenser (1), motor driven compressor (2), fluid reservoir (3), blowing engine (4), an evaporator (5), an electric expansion valve (9), a temperature sensor (10), condensator outlet enters condenser inlet more successively after an electric expansion valve (9), evaporator (5), fluid reservoir (3), compressor 2, forms the cooling-liquid cycle of crew module's a/c system;
It is characterized in that, described Vehicular dynamic battery group active air cooling cooling system also comprises power battery pack cooling line, ducting system and control system; Described power battery pack cooling line comprises and is connected to No. two electromagnetic valves (11) between described condenser (1) outlet with fluid reservoir (3) entrance, No. two electric expansion valves (12), No. two evaporators (15), No. two evaporating pressure regulating valves (14), No. two check valves (13) in turn, the cooling-liquid cycle outside formation crew module a/c system; The entrance of described ducting system connects No. two evaporators (15) and passenger cabin (16) respectively, and the outlet of ducting system connects power battery box (31); Described control system comprises the battery management system (32), conditioning control unit (34) and the cooling system control unit (35) that are communicated with entire car controller (33) by CAN.
2. a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 1, it is characterized in that, described crew module's a/c system (100) also comprises a check valve (6), an evaporating pressure regulating valve (7) and an electromagnetic valve (8), before an electromagnetic valve (8) is arranged on described condenser (1) outlet and electric expansion valve (9) entrance, evaporating pressure regulating valve (7) entrance connects an evaporator (5), evaporating pressure regulating valve (7) outlet connection check valve (6) entrance, check valve (6) outlet connects described fluid reservoir (3) entrance.
3. a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 1, it is characterized in that, described ducting system comprises an air channel (17), No. two air channels (18) and No. three air channels (23), No. two air channel (18) entrances connect passenger cabin (16), air channel (17) entrance connects No. two evaporators (15), air channel (17) outlet is connected No. three air channel (23) entrances jointly with No. two air channel (18) outlets, No. three air channel (23) ends connect the ventilation inlet of power battery box (31), the air inlet of Battery case is provided with induced draught fan (25), the opposite side of casing is provided with air outlet and air ejector fan (26).
4. a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 3, it is characterized in that, the entrance of No. two air channels (18) is provided with No. two temperature sensors (27) and No. two air doors (20), and No. two air doors (20) pass through spline joint with No. two stepping motors (22); Be provided with an air door (19) in an air channel (17), an air door (19) and a stepping motor (21) pass through spline joint; The wind outlet of No. two evaporators (15) is provided with No. three temperature sensors (28), and the air inlet of power battery box (31) is also provided with No. four temperature sensors (29) and air velocity transducer (24).
5. the control method of a Vehicular dynamic battery group active air cooling cooling system, it is characterized in that, Vehicular dynamic battery group active air cooling cooling system comprises crew module's a/c system (100), power battery pack cooling line, ducting system and control system, described power battery pack cooling line is connected between condenser (1) outlet of described crew module's a/c system (100) and fluid reservoir (3) entrance, it comprises No. two evaporators (15), described ducting system comprises an air channel (17), No. two air channels (18) and No. three air channels (23), No. two air channel (18) entrances connect passenger cabin (16), air channel (17) entrance connects No. two evaporators (15), air channel (17) outlet is connected No. three air channel (23) entrances jointly with No. two air channel (18) outlets, No. three air channel (23) ends connect the ventilation inlet of power battery box (31), the air inlet of Battery case is provided with induced draught fan (25), the opposite side of Battery case is provided with air ejector fan (26),
This control method comprises the following steps:
Step one, utilize fuzzy control and leveling factor method to combine, obtain system temperature control coefficients R and also judge whether temperature control coefficients 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 need inactive power battery pack cooling line and select to blow the need of crew module to heat power battery pack according to the size that crew module comes air temperature and battery-efficient operating temperature lower limit;
If step 3 temperature control coefficients R is non-vanishing, show that power battery pack has radiating requirements, now need to resolve the EAT T needed for battery box air intake, and the EAT needed for battery box selects radiating mode to dispel the heat to power battery pack.
6. the control method of a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 5, it is characterized in that, described step one utilizes fuzzy control and leveling factor method to combine, and obtains system temperature control coefficients R, specifically comprises following process:
1) first determine according to fuzzy control method the compound influence coefficient Q reflecting power battery pack radiating requirements:
1.1) input and the output of fuzzy controller is determined: input is current power battery set charge/discharge current value and present battery surface temperature value, and output is compound influence coefficient Q;
1.2) input of fuzzy controller, the value of output and domain scope is determined;
1.3) obfuscation is carried out to the input of fuzzy controller and output, determine the quantizing factor of charging and discharging currents, battery surface temperature and compound influence coefficient Q, be respectively Ki=2/C, Kt=1/10 and Kc=1; Wherein, C is charge-discharge magnification; Actual value is multiplied by quantizing factor and is domain value; Determine membership function, namely in function, σ is respectively 0.15,3 and 0.3; C is normal distribution intermediate value, and span is the actual value of variable of above-mentioned fuzzy controller, and x value is system input value, is charge-discharge magnification and battery surface temperature;
1.4) determine fuzzy inference rule, formulate fuzzy matrix table based on fuzzy inference rule;
2) factor of utilization revised law will through above-mentioned steps 1) the influence coefficient Q that meets that determines of fuzzy control method revises through three times successively, obtains system temperature control coefficients R:
R＝W×u1×u2＝Q×Ksoc×u1×u2
Wherein,
Q is compound influence coefficient;
Ksoc is SOC coefficient of correction;
W is temperature prediction coefficient, and span is determined by Q and Ksoc;
U1 is battery box internal temperature coefficient of correction;
U2 is battery surface rate of temperature change coefficient of correction.
7. the control method of a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 5, is characterized in that, described step 2 is when temperature control coefficients R is zero, and power battery pack temperature is too low and without control process during radiating requirements be:
1) inactive described power battery pack cooling line, No. two evaporators (15) are not freezed and close an air channel (17);
2) judge that air temperature is carried out higher than the battery-efficient operating temperature lower limit preset in passenger cabin (16) whether;
3) if passenger cabin (16) carry out air temperature higher than battery-efficient operating temperature lower limit, then enabling No. two air channels (18) makes passenger cabin (16) the wind comes from, and regulates the rotating speed preheating battery pack of induced draught fan (25) and air ejector fan (26); If passenger cabin (16) carry out air temperature lower than battery-efficient operating temperature lower limit, then close No. two air channels (18) and close down induced draught fan (25) and air ejector fan (26).
8. the control method of a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 5, is characterized in that, if described step 3 temperature control coefficients R is non-vanishing, power battery pack has control process during radiating requirements to be:
1) the EAT T needed for battery box is resolved according to system temperature control coefficients R air intake, analytic formula is as follows:
Wherein, N cfor the scope of temperature control coefficients R,
N c = k soc max &times; Q max &times; u 1 max &times; u 2 max - k soc min &times; Q min &times; u 1 min &times; u 2 min ;
with get the definite value between 0 to 2;
Q max＝8，Q min＝0； u 1 max = 2 , u 1 min = 0 ; u 2 max = 2 , u 2 min = 0 ;
T maxfor the EAT maxim preset, unit: DEG C;
T minfor the EAT minimum value preset, unit: DEG C;
T air intakeeAT needed for battery box, unit: DEG C.
2) if through above-mentioned steps 1) EAT T needed for the battery box that parses air intakehigher than the temperature T when the first two number air channel (18) 2, then No. two evaporators (15) still do not work, and close an air door (19) completely, maintain the rotating speed of now induced draught fan (25) and air ejector fan (26);
3) if work as the EAT T of the first two number air channel (18) 2with through above-mentioned steps 1) the EAT T that extrapolates air intakewhen difference is less than 10%, i.e. (T 2-T air intake)/T air intake<10%, does not still make No. two evaporator (15) work, increases the rotating speed of induced draught fan (25) and air ejector fan (26), improve charge air to make up the deficiency of EAT;
4) if work as the EAT T of the first two number air channel (18) 2with through above-mentioned steps 1) EAT extrapolated differ by more than 10% time, i.e. (T 2-T air intake)/T air intake>10%, then open forced heat radiation pattern, and ensure that the intake of cooling system in EAT control process is constant;
5) finally by judging battery surface temperature whether in the scope of setting in advance, if go beyond the scope, system temperature control coefficients R being revised, recalculates radiating requirements.
9. the control method of a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 8, it is characterized in that, step 4 in described step 3) open forced heat radiation pattern, and ensure that the control process that the intake of cooling system in EAT control process is constant is:
Step 401, No. two evaporators (15) start refrigeration, and regulate the intake of an air channel (17) and No. two air channels (18), ensure the EAT T needed for battery box air intake: open an air channel (17) and make it be in maximum air intake state and make No. two evaporators (15) start refrigeration, regulate No. two air channel (18) intakes simultaneously;
Step 402, the EAT T completing described step 401 and control needed for battery box air intakeafter, regulate the rotating speed of induced draught fan (25) and air ejector fan (26), constant to ensure the intake of battery box;
Step 403, judge whether EAT meets setting range, if EAT does not meet setting range, then again an air channel (17) and the intake of No. two air channels (18) and the evaporating temperature of No. two evaporators (15) are controlled;
Step 404, judge whether intake meets setting range, if intake does not meet setting range, then again implement to control to induced draught fan (25) and air ejector fan (26).
10. the control method of a kind of Vehicular dynamic battery group active air cooling cooling system as claimed in claim 9, is characterized in that, the EAT T in described step 401 needed for battery box air intakecontrol process in, first the gas temperature of an air channel (17) is set, then the aperture of No. two air doors (20) arranged in No. two air channels (18) is regulated according to required EAT, the air door (19) now arranged in an air channel (17) keeps full-gear, the air quantity ratio needed for formation;
Can formula be obtained as follows by the Ideal-Gas Equation:
V 1t 1+ V 2t 2=(V 1+ V 2) T air intake,
Wherein, V i=v i× A i, i=1,2, V iair channel charge air, V 1the charge air of an air channel (17), V 2the charge air of No. two air channels (18), unit: m 3/ s; A 1the sectional area of an air channel (17), A 2the sectional area of No. two air channels (18), unit: m 2; v 1the wind speed of an air channel (17), v 2the wind speed of No. two air channels (18), and v 1=v 2, unit: m/s; T 1the gas temperature of an air channel (17), T 2the gas temperature of No. two air channels (18), unit: DEG C; A 3that No. three duct cross-sections amass, and A 1max+ A 2max=A 3, unit: m 2.
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