CN106953138A - A kind of electrokinetic cell water chiller system and its temperature difference intelligent control method - Google Patents
A kind of electrokinetic cell water chiller system and its temperature difference intelligent control method Download PDFInfo
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- CN106953138A CN106953138A CN201710330957.6A CN201710330957A CN106953138A CN 106953138 A CN106953138 A CN 106953138A CN 201710330957 A CN201710330957 A CN 201710330957A CN 106953138 A CN106953138 A CN 106953138A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
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- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Disclosed by the invention is a kind of electrokinetic cell water chiller system and its temperature difference intelligent control method, including water chiller and water chiller controller, water chiller includes compressor, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger, ptc heater, triple valve, inflow temperature sensor, electrokinetic cell casing, leaving water temperature sensors, water tank, electronic water pump, and compressor, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger series connection are set.The present invention not only improves the automaticity of electrokinetic cell water chiller control, and the control system, according to the difference for judging battery mean temperature and water chiller leaving water temperature, pass through intelligent control algorithm, real-time adaptive adjustment compressor, electronic water pump and condenser fan working speed, indirect control, battery are operated in optimum temperature range and temperature range, and predict battery temperature tendency in advance by ampere-hour integration.
Description
Technical field
The present invention relates to the application field of new-energy automobile power battery technology, more specifically a kind of power electric
The cold machine set system of water and its temperature difference intelligent control method.
Background technology
During electric automobile during traveling, the chemical reaction of complexity occurs in discharge and recharge for electrokinetic cell, easily in battery
The substantial amounts of heat of inner accumulation, causes battery temperature to rise, and causes the battery performance such as conversion efficiency, cycle life index to decline,
And traditional power battery cooling system uses natural air cooled and water-cooled, and high-power power battery uses water-cooling project.
It is general using shoulder rotation control in the control of traditional power battery water chiller, by design temperature and battery temperature
Compare, when battery temperature is higher than setting cryogenic temperature, water chiller starts refrigeration, compressor, electronic water pump and condenser fan
Operated with fixed rotating speed；When battery temperature is less than setting cryogenic temperature, compressor, electronic water pump and condenser fan are stopped,
The change of such loop control battery temperature.This control method is simple, but often has the following disadvantages：
First, compressor, electronic water pump and condenser fan frequent starting easily cause the inside battery temperature difference larger, temperature with stopping
It is harmonious poor, and the frequency conversion effect of compressor is not given full play to, cause the reduction of product service life, hundred kilometers of consumptions of vehicle
Electricity increase, so as to influence vehicle performance.
2nd, after water chiller is stopped, water pump is stopped immediately, causes cooling line temperature too low, it is impossible to obtain
Circulating cooling, causes refrigeration device to be easily damaged.
The content of the invention
Disclosed by the invention is a kind of electrokinetic cell water chiller system and its temperature difference intelligent control method, its main purpose
It is to overcome deficiencies of the prior art and shortcoming there is provided the temperature difference Based Intelligent Control side that a kind of battery water cooling unit system is united
Method, it not only effectively improves the automaticity of electrokinetic cell water chiller control, and the control system can be according to judgement
Battery mean temperature and the difference of water chiller leaving water temperature, by intelligent control algorithm, real-time adaptive adjustment compression is mechanical, electrical
Sub- water pump and condenser fan working speed, so that indirect control electrokinetic cell is operated in optimum temperature range and temperature range,
And battery temperature tendency is predicted by ampere-hour integration in advance, increase modifying factor can effectively solve the sluggishness of temperature acquisition
Property, the temperature equalization of more efficient control electrokinetic cell extends electrokinetic cell service life, and effectively reduces water chiller
Run power consumption.
The technical solution adopted by the present invention is as follows：
A kind of electrokinetic cell water chiller system, water chiller and the water chiller controller, the water chiller includes pressure
Contracting machine, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger, ptc heater, triple valve,
Inflow temperature sensor, electrokinetic cell casing, leaving water temperature sensors, water tank, electronic water pump, the compressor, pressure switch,
Condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger series connection are set；The ptc heater, triple valve,
Inflow temperature sensor, electrokinetic cell casing, leaving water temperature sensors, water tank, electronic water pump series connection are set, and by described
Triple valve is in parallel with the plate heat exchanger and connects setting, and the water chiller controller passes through CAN and the water cooling unit
Vertical data communication connection is set up, the water chiller controller is provided with a timer, and timing cycle is W, and the water chiller is provided with four
Individual mode of operation, respectively standby mode, circulation pattern, refrigeration mode and heating mode；
The temperature difference intelligent control method of described electrokinetic cell water chiller system, including step in detail below：
Step one：In the water chiller low pressure after electricity, System self-test fault-free enters standby mode, the compressor, electronics
Water pump and condenser fan are stopped；
Step 2：The water chiller controller receives battery cell minimum temperature T1, battery list in the electrokinetic cell casing
Body maximum temperature T2 and each battery modules temperature, and a whole set of battery mean temperature T3 is calculated, while the water chiller is controlled
Device gathers the leaving water temperature T4 of the leaving water temperature sensors and the inflow temperature T5 of inflow temperature sensor respectively, calculates battery
Mean temperature T3 and water chiller leaving water temperature T4 the system temperature difference are T6, initialization system temperature range [T7, T8], and are divided into
Level Four temperature difference step, be respectively [T7,（3T7+T8）/4)、[（3T7+T8）/ 4,（T7+T8）/2)、[（T7+T8）/2,(T7+
4T8)/4)、[（3T7+T8）/4,T8]；Target refrigeration opening temperature T9, limit cryogenic temperature T10, target heating is set to open temperature
Degree T11, the limit heat temperature T12；
Step 3：It is higher than target refrigeration opening temperature T9 or warm less than target heating unlatching when meeting electrokinetic cell mean temperature T3
Spend T11 or the battery cell temperature difference exceed setting value, the water chiller enters circulation pattern, and control system opens electronic water pump,
Running speed is initial setting speed n10, controls the flow of electrokinetic cell cooling medium；
Step 4：Into after circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T9, by circulating
Pattern is cut into refrigeration mode；
Step 5：Into after circulation pattern, when meeting battery mean temperature T3 less than target heating opening temperature T11, by following
Ring mode is cut into heating mode；
Step 6：Into after circulation pattern, when the inflow temperature T5's and leaving water temperature sensors for meeting inflow temperature sensor
Leaving water temperature T4 reaches that battery cell temperature range exceedes design temperature in design temperature, or electrokinetic cell casing, by cyclic module
Formula is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7：Into after circulation pattern, it is less than when meeting battery dump energy in electrokinetic cell casing under 30% or vehicle high pressure
When electric, water chiller is jumped out circulation pattern and is stopped.
Further, the refrigeration mode of the step 4 includes step in detail below：
（1）Into after refrigeration mode, triple valve is closed, the condenser fan and compressor is then successively opened, the condenser fan
Initial launch rotating speed with compressor is respectively n20 and n30；
（2）When system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, the compressor is every 10 timing weeks
Phase W increases rotating speed, and each rotating speed incremental change is 200r/min, until reach that highest working speed is run, and condenser fan and electricity
Sub- water pump is operated in moderate rotation operating mode respectively；
（3）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, compressor is every 10 timings
Cycle W increases compressor rotary speed, and each rotating speed incremental change is 100r/min, until reaching that highest working speed is run, and condenses
Fan and electronic water pump increase speed every 20 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each portion
Part highest working speed is run；
（4）When system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, compressor is every 10 timings
Cycle W reduces rotating speed, and each rotating speed decrement is 100r/min, until initial launch rotating speed is dropped to, and condenser fan and electronics
Water pump increases speed every 10 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each part highest work
Rotating speed is run；
（5）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, compressor reduces every 5 timing cycle W
Rotating speed, each rotating speed decrement is 200r/min, until each part initial launch rotating speed is dropped to, and condenser fan and electronic water pump
Increase speed every 10 timing cycle W, each rotating speed incremental change is 100r/min, until reaching each part highest working speed
Operation；
（6）When the inflow temperature T5 of inflow temperature sensor is less than limit cryogenic temperature T10, system exits refrigeration mode, institute
It is respectively to be stopped after n30 and n20 continues 20 timing cycles to state compressor and condenser fan operation initial speed, and system is returned
To circulation pattern.
Further, the heating mode of the step 5 includes step in detail below：
（1）Into after heating mode, triple valve is opened, ptc heater is then turned on, water chiller heats skill using PTC-ceramic
Art, according to battery thermal management system scheme, four heating powers of system design are respectively P1, P2, P3 and P4, and meet P1 ＞ P2
＞ P3>P4 ＞ 0；
（2）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, PTC heating powers are P1, electronic water pump work
Make in moderate rotation operating mode；
（3）If system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, PTC heating powers are P2, electricity
Sub- water pump is every 20 timing cycle W increase rotating speeds, and each rotating speed incremental change is 50r/min, until reaching highest working speed
Operation；
（4）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, PTC heating powers are P3, electricity
Sub- water pump is every 10 timing cycle W increase rotating speeds, and each rotating speed incremental change is 100r/min, until reaching highest working speed
Operation；
（5）If system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, PTC heating powers are P4, and electronic water pump
Every 5 timing cycle W increase rotating speeds, each rotating speed incremental change is 200r/min, until reaching that highest working speed is run；
（6）If the inflow temperature T5 of inflow temperature sensor heats temperature T12 higher than the limit, system exits heating mode, closes
Ptc heater is closed, triple valve is closed, system returns to circulation pattern.
Further, battery operating current in the water chiller collection CAN, and being calculated using ampere-hour integration method
The current heat exchange ability of battery, predicts battery temperature tendency in advance.
By the above-mentioned description of this invention, compared to the prior art, the advantage of the invention is that：
The present invention can not only effectively improve the automaticity of electrokinetic cell water chiller control, and the control system can be certainly
Adjustment compressor, electronic water pump and condenser fan working speed are adapted to, maintains electrokinetic cell to be operated in optimum temperature range and temperature
In poor scope, and battery temperature tendency is predicted by ampere-hour integration in advance, increase modifying factor can effectively solve temperature and adopt
The hysteresis of collection, the temperature equalization of more efficient control electrokinetic cell extends electrokinetic cell service life, and effectively reduce
Water chiller runs power consumption.
Brief description of the drawings
Fig. 1 is the system architecture diagram of electrokinetic cell water chiller in invention.
Fig. 2 is water chiller control method schematic diagram.
Fig. 3 is refrigeration mode control method schematic diagram of the present invention.
Fig. 4 is heating mode control method schematic diagram of the present invention.
Embodiment
Illustrate further to illustrate the embodiment of the present invention with reference to the accompanying drawings.
As shown in Figures 1 to 4, a kind of electrokinetic cell water chiller system, water chiller and the water chiller controller,
The water chiller includes compressor 1, pressure switch 2, condenser 3, condenser fan 4, liquid storage drying chamber 5, expansion valve 6, board-like
Exchanger 7, ptc heater 8, triple valve 9, inflow temperature sensor 10, electrokinetic cell casing 11, leaving water temperature sensors 12,
Water tank 13, electronic water pump 14, the compressor 1, pressure switch 2, condenser 3, condenser fan 4, liquid storage drying chamber 5, expansion valve
6th, the series connection of plate heat exchanger 7 is set；The ptc heater 8, triple valve 9, inflow temperature sensor 10, electrokinetic cell casing
11st, leaving water temperature sensors 12, water tank 13, the series connection of electronic water pump 14 are set, and pass through the triple valve 9 and the board-like friendship
Parallel operation 7, which is in parallel, connects setting, and the water chiller controller is set up data communication by CAN and the water chiller and connected
Connect, the water chiller controller is provided with a timer, and timing cycle is W, the water chiller is respectively provided with four mode of operations
Standby mode, circulation pattern, refrigeration mode and heating mode；
The temperature difference intelligent control method of described electrokinetic cell water chiller system, including step in detail below：
Step one：In the water chiller low pressure after electricity, System self-test fault-free enters standby mode, the compressor, electronics
Water pump and condenser fan are stopped；
Step 2：The water chiller controller receives battery cell minimum temperature T1, battery list in the electrokinetic cell casing
Body maximum temperature T2 and each battery modules temperature, and a whole set of battery mean temperature T3 is calculated, while the water chiller is controlled
Device gathers the leaving water temperature T4 of the leaving water temperature sensors and the inflow temperature T5 of inflow temperature sensor respectively, calculates battery
Mean temperature T3 and water chiller leaving water temperature T4 the system temperature difference are T6, initialization system temperature range [T7, T8], and are divided into
Level Four temperature difference step, be respectively [T7,（3T7+T8）/4)、[（3T7+T8）/ 4,（T7+T8）/2)、[（T7+T8）/2,(T7+
4T8)/4)、[（3T7+T8）/4,T8]；Target refrigeration opening temperature T9, limit cryogenic temperature T10, target heating is set to open temperature
Degree T11, the limit heat temperature T12；
Step 3：It is higher than target refrigeration opening temperature T9 or warm less than target heating unlatching when meeting electrokinetic cell mean temperature T3
Spend T11 or the battery cell temperature difference exceed setting value, the water chiller enters circulation pattern, and control system opens electronic water pump,
Running speed is initial setting speed n10, controls the flow of electrokinetic cell cooling medium；
Step 4：Into after circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T9, by circulating
Pattern is cut into refrigeration mode；
Step 5：Into after circulation pattern, when meeting battery mean temperature T3 less than target heating opening temperature T11, by following
Ring mode is cut into heating mode；
Step 6：Into after circulation pattern, when the inflow temperature T5's and leaving water temperature sensors for meeting inflow temperature sensor
Leaving water temperature T4 reaches that battery cell temperature range exceedes design temperature in design temperature, or electrokinetic cell casing, by cyclic module
Formula is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7：Into after circulation pattern, it is less than when meeting battery dump energy in electrokinetic cell casing under 30% or vehicle high pressure
When electric, water chiller is jumped out circulation pattern and is stopped.
Further, the refrigeration mode of the step 4 includes step in detail below：
（1）Into after refrigeration mode, triple valve is closed, the condenser fan and compressor is then successively opened, the condenser fan
Initial launch rotating speed with compressor is respectively n20 and n30；
（2）When system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, the compressor is every 10 timing weeks
Phase W increases rotating speed, and each rotating speed incremental change is 200r/min, until reach that highest working speed is run, and condenser fan and electricity
Sub- water pump is operated in moderate rotation operating mode respectively；
（3）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, compressor is every 10 timings
Cycle W increases compressor rotary speed, and each rotating speed incremental change is 100r/min, until reaching that highest working speed is run, and condenses
Fan and electronic water pump increase speed every 20 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each portion
Part highest working speed is run；
（4）When system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, compressor is every 10 timings
Cycle W reduces rotating speed, and each rotating speed decrement is 100r/min, until initial launch rotating speed is dropped to, and condenser fan and electronics
Water pump increases speed every 10 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each part highest work
Rotating speed is run；
（5）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, compressor reduces every 5 timing cycle W
Rotating speed, each rotating speed decrement is 200r/min, until each part initial launch rotating speed is dropped to, and condenser fan and electronic water pump
Increase speed every 10 timing cycle W, each rotating speed incremental change is 100r/min, until reaching each part highest working speed
Operation；
（6）When the inflow temperature T5 of inflow temperature sensor is less than limit cryogenic temperature T10, system exits refrigeration mode, institute
It is respectively to be stopped after n30 and n20 continues 20 timing cycles to state compressor and condenser fan operation initial speed, and system is returned
To circulation pattern.
Further, the heating mode of the step 5 includes step in detail below：
（1）Into after heating mode, triple valve is opened, ptc heater is then turned on, water chiller heats skill using PTC-ceramic
Art, according to battery thermal management system scheme, four heating powers of system design are respectively P1, P2, P3 and P4, and meet P1 ＞ P2
＞ P3>P4 ＞ 0；
（2）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, PTC heating powers are P1, electronic water pump work
Make in moderate rotation operating mode；
（3）If system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, PTC heating powers are P2, electricity
Sub- water pump is every 20 timing cycle W increase rotating speeds, and each rotating speed incremental change is 50r/min, until reaching highest working speed
Operation；
（4）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, PTC heating powers are P3, electricity
Sub- water pump is every 10 timing cycle W increase rotating speeds, and each rotating speed incremental change is 100r/min, until reaching highest working speed
Operation；
（5）If system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, PTC heating powers are P4, and electronic water pump
Every 5 timing cycle W increase rotating speeds, each rotating speed incremental change is 200r/min, until reaching that highest working speed is run；
（6）If the inflow temperature T5 of inflow temperature sensor heats temperature T12 higher than the limit, system exits heating mode, closes
Ptc heater is closed, triple valve is closed, system returns to circulation pattern.
Further, battery operating current in the water chiller collection CAN, and being calculated using ampere-hour integration method
The current heat exchange ability of battery, predicts battery temperature tendency in advance.
The present invention can not only effectively improve the automaticity of electrokinetic cell water chiller control, and the control system
Can self-adaptative adjustment compressor, electronic water pump and condenser fan working speed, maintain electrokinetic cell be operated in optimum temperature range
Battery temperature tendency is predicted in advance in temperature range, and by ampere-hour integration, and increase modifying factor can effectively solve temperature
The hysteresis of collection is spent, the temperature equalization of more efficient control electrokinetic cell extends electrokinetic cell service life, and effectively
Reduce water chiller operation power consumption.
The embodiment of the present invention is above are only, but the design concept of the present invention is not limited merely to this, every profit
The present invention is improved with carrying out unsubstantiality with this design, should belong to the behavior for invading the scope of the present invention.
Claims (4)
1. a kind of electrokinetic cell water chiller system, it is characterised in that：Including water chiller and water chiller controller, the water
Cold group includes compressor, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger, PTC and added
Hot device, triple valve, inflow temperature sensor, electrokinetic cell casing, leaving water temperature sensors, water tank, electronic water pump, the compression
Machine, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger series connection are set；The PTC adds
Hot device, triple valve, inflow temperature sensor, electrokinetic cell casing, leaving water temperature sensors, water tank, electronic water pump series connection are set
Put, and be in parallel by the triple valve and the plate heat exchanger and connect setting, the water chiller controller passes through CAN
Data communication is set up with the water chiller to be connected, the water chiller controller is provided with a timer, and timing cycle is W, the water
Cold group is provided with four mode of operations, respectively standby mode, circulation pattern, refrigeration mode and heating mode；
The temperature difference intelligent control method of described electrokinetic cell water chiller system, including step in detail below：
Step one：In the water chiller low pressure after electricity, System self-test fault-free enters standby mode, the compressor, electronics
Water pump and condenser fan are stopped；
Step 2：The water chiller controller receives battery cell minimum temperature T1, battery list in the electrokinetic cell casing
Body maximum temperature T2 and each battery modules temperature, and a whole set of battery mean temperature T3 is calculated, while the water chiller is controlled
Device gathers the leaving water temperature T4 of the leaving water temperature sensors and the inflow temperature T5 of inflow temperature sensor respectively, calculates battery
Mean temperature T3 and water chiller leaving water temperature T4 the system temperature difference are T6, initialization system temperature range [T7, T8], and are divided into
Level Four temperature difference step, be respectively [T7,（3T7+T8）/4)、[（3T7+T8）/ 4,（T7+T8）/2)、[（T7+T8）/2,(T7+
4T8)/4)、[（3T7+T8）/4,T8]；Target refrigeration opening temperature T9, limit cryogenic temperature T10, target heating is set to open temperature
Degree T11, the limit heat temperature T12；
Step 3：It is higher than target refrigeration opening temperature T9 or warm less than target heating unlatching when meeting electrokinetic cell mean temperature T3
Spend T11 or the battery cell temperature difference exceed setting value, the water chiller enters circulation pattern, and control system opens electronic water pump,
Running speed is initial setting speed n10, controls the flow of electrokinetic cell cooling medium；
Step 4：Into after circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T9, by circulating
Pattern is cut into refrigeration mode；
Step 5：Into after circulation pattern, when meeting battery mean temperature T3 less than target heating opening temperature T11, by following
Ring mode is cut into heating mode；
Step 6：Into after circulation pattern, when the inflow temperature T5's and leaving water temperature sensors for meeting inflow temperature sensor
Leaving water temperature T4 reaches that battery cell temperature range exceedes design temperature in design temperature, or electrokinetic cell casing, by cyclic module
Formula is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7：Into after circulation pattern, it is less than when meeting battery dump energy in electrokinetic cell casing under 30% or vehicle high pressure
When electric, water chiller is jumped out circulation pattern and is stopped.
2. the temperature difference intelligent control method of electrokinetic cell water chiller system according to claim 1, it is characterised in that：Institute
Stating the refrigeration mode of step 4 includes step in detail below：
（1）Into after refrigeration mode, triple valve is closed, the condenser fan and compressor is then successively opened, the condenser fan
Initial launch rotating speed with compressor is respectively n20 and n30；
（2）When system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, the compressor is every 10 timing weeks
Phase W increases rotating speed, and each rotating speed incremental change is 200r/min, until reach that highest working speed is run, and condenser fan and electricity
Sub- water pump is operated in moderate rotation operating mode respectively；
（3）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, compressor is every 10 timings
Cycle W increases compressor rotary speed, and each rotating speed incremental change is 100r/min, until reaching that highest working speed is run, and condenses
Fan and electronic water pump increase speed every 20 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each portion
Part highest working speed is run；
（4）When system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, compressor is every 10 timings
Cycle W reduces rotating speed, and each rotating speed decrement is 100r/min, until initial launch rotating speed is dropped to, and condenser fan and electronics
Water pump increases speed every 10 timing cycle W, and each rotating speed incremental change is 50r/min, until reaching each part highest work
Rotating speed is run；
（5）When system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, compressor reduces every 5 timing cycle W
Rotating speed, each rotating speed decrement is 200r/min, until each part initial launch rotating speed is dropped to, and condenser fan and electronic water pump
Increase speed every 10 timing cycle W, each rotating speed incremental change is 100r/min, until reaching each part highest working speed
Operation；
（6）When the inflow temperature T5 of inflow temperature sensor is less than limit cryogenic temperature T10, system exits refrigeration mode, institute
It is respectively to be stopped after n30 and n20 continues 20 timing cycles to state compressor and condenser fan operation initial speed, and system is returned
To circulation pattern.
3. the temperature difference intelligent control method of electrokinetic cell water chiller system according to claim 1, it is characterised in that：Institute
Stating the heating mode of step 5 includes step in detail below：
（1）Into after heating mode, triple valve is opened, ptc heater is then turned on, water chiller heats skill using PTC-ceramic
Art, according to battery thermal management system scheme, four heating powers of system design are respectively P1, P2, P3 and P4, and meet P1 ＞ P2
＞ P3>P4 ＞ 0；
（2）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4, T8] condition, PTC heating powers are P1, electronic water pump work
Make in moderate rotation operating mode；
（3）If system temperature difference T6 meet temperature difference step [（T7+T8）/ 2, (T7+4T8)/4) condition, PTC heating powers are P2, electricity
Sub- water pump is every 20 timing cycle W increase rotating speeds, and each rotating speed incremental change is 50r/min, until reaching highest working speed
Operation；
（4）If system temperature difference T6 meet temperature difference step [（3T7+T8）/ 4,（T7+T8）/ 2) condition, PTC heating powers are P3, electricity
Sub- water pump is every 10 timing cycle W increase rotating speeds, and each rotating speed incremental change is 100r/min, until reaching highest working speed
Operation；
（5）If system temperature difference T6 meet temperature difference step [T7,（3T7+T8）/ 4) condition, PTC heating powers are P4, and electronic water pump
Every 5 timing cycle W increase rotating speeds, each rotating speed incremental change is 200r/min, until reaching that highest working speed is run；
（6）If the inflow temperature T5 of inflow temperature sensor higher than the limit less than when heating temperature T12, system, which is exited, heats mould
Formula, closes ptc heater, closes triple valve, and system returns to circulation pattern.
4. the temperature difference intelligent control method of electrokinetic cell water chiller system according to claim 1, it is characterised in that：Institute
Battery operating current in water chiller collection CAN is stated, and the current heat exchange of battery is calculated using ampere-hour integration method
Ability, predicts battery temperature tendency in advance.
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