CN107425232B - A kind of power battery water chiller system and its intelligent control method - Google Patents
A kind of power battery water chiller system and its intelligent control method Download PDFInfo
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- CN107425232B CN107425232B CN201710330486.9A CN201710330486A CN107425232B CN 107425232 B CN107425232 B CN 107425232B CN 201710330486 A CN201710330486 A CN 201710330486A CN 107425232 B CN107425232 B CN 107425232B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
-
- 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
- F25B49/022—Compressor control arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
- H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
- H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
Disclosed by the invention is a kind of power battery water chiller system and its intelligent control method, including water chiller and water chiller controller, the 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, power battery cabinet, 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 setting.The present invention can not only effectively improve the degree of automation of power battery water chiller control, and the control system can adaptively adjust compressor, electronic water pump and condenser fan working speed, maintain power battery work in optimum temperature range and the temperature difference range, and battery temperature tendency is predicted by ampere-hour integral in advance, the hysteresis of temperature acquisition can effectively be solved by increasing modifying factor.
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 intelligent control method.
Background technique
During electric automobile during traveling, complicated chemical reaction occurs in charge and discharge for power battery, is easy in battery
The a large amount of heat of inner accumulation, causes battery temperature to rise, and the battery performances index such as transfer efficiency, cycle life is caused to decline,
And traditional power battery cooling system uses natural air cooled and water cooling, and high-power power battery is all made of water-cooling project.
In the control of traditional power battery water chiller, generally controlled using shoulder rotation, by set temperature and battery temperature
Compare, when battery temperature is higher than setting cryogenic temperature, water chiller starts to freeze, compressor, electronic water pump and condenser fan
It is operated with fixed rotating speed；When battery temperature is lower than setting cryogenic temperature, compressor, electronic water pump and condenser fan stop working,
The variation of such loop control battery temperature.This control method is simple, but often has the disadvantage in that
One, compressor, electronic water pump and condenser fan frequent starting and stopping, easily causing the inside battery temperature difference larger,
Temperature equalization is poor, and does not give full play to the frequency conversion effect of compressor, leads to the reduction of product service life, vehicle hundred is public
In power consumption increase, to influence vehicle service performance.
Two, after water chiller stops working, water pump stops working immediately, causes cooling line temperature too low, is unable to get
Circulating cooling causes refrigeration device to be easily damaged.
Summary of the invention
Disclosed by the invention is that a kind of power battery water chiller system and its intelligent control method, main purpose are
Overcome deficiencies of the prior art and disadvantage, provides a kind of power battery water chiller intelligent control method, it is not only
The degree of automation of power battery water chiller control can be effectively improved, and the control system can adaptively adjust compression
Mechanical, electrical sub- water pump and condenser fan working speed maintain power battery work in optimum temperature range and the temperature difference range, and
Battery temperature tendency is predicted in advance by ampere-hour integral, and the hysteresis of temperature acquisition can effectively be solved by increasing modifying factor, more
Added with the temperature equalization of effect control power battery, extend power battery service life, and effectively reduces water chiller operation
Power consumption.
The technical solution adopted by the invention is as follows:
A kind of power battery water chiller system, including water chiller and water chiller controller, the water chiller packet
Include compressor, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger, ptc heater, threeway
Valve, inflow temperature sensor, power battery cabinet, leaving water temperature sensors, water tank, electronic water pump, the compressor, pressure are opened
Pass, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger series connection setting；The ptc heater, threeway
Valve, inflow temperature sensor, power battery cabinet, leaving water temperature sensors, water tank, electronic water pump series connection setting, and pass through
The triple valve and the plate heat exchanger, which are in parallel, connects setting, and the water chiller controller passes through CAN bus and the water
Cold group establishes data communication connection, which is equipped with a timer, timing cycle W, which sets
There are four operating modes, respectively standby mode, circulation pattern, refrigeration mode and heating mode.
The intelligent control method of the power battery water chiller system, comprising the following specific steps
Step 1: after the water chiller low pressure powers on, system enters standby mode, the pressure after detecting fault-free automatically
It contracts mechanical, electrical sub- water pump and condenser fan stops working；
Step 2: the water chiller controller receives battery cell minimum temperature T1, electricity in the power battery cabinet
The temperature of pond monomer maximum temperature T2 and each battery modules, and a whole set of battery mean temperature T3 is calculated, while the water chiller
Controller acquires the inflow temperature T4 of the inflow temperature sensor and the leaving water temperature T5 of leaving water temperature sensors respectively, setting
Target is freezed, and opening temperature T6, target refrigeration stop temperature T7, target heats opening temperature T8, heating stops temperature T9 and the limit
Temperature T10；
Step 3: it is higher than target refrigeration opening temperature T6 or warm lower than target heating unlatching when meeting battery mean temperature T3
The battery cell temperature difference for spending T8 or the Battery case is more than setting value, and the water chiller enters circulation pattern, control system
The electronic water pump is opened, running speed is initial setting speed n10, controls the flow of power battery cooling medium；
Step 4: after entering circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, by
Circulation pattern is cut into refrigeration mode；
Step 5: after entering circulation pattern, when meeting battery mean temperature T3 lower than target heating opening temperature T8, by
Circulation pattern is cut into heating mode；
Step 6: after entering circulation pattern, when inflow temperature T4 and the leaving water temperature sensing for meeting inflow temperature sensor
It is more than set temperature that the leaving water temperature T5 of device, which reaches battery cell the temperature difference range in set temperature or power battery cabinet, by following
Ring mode is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7: after entering circulation pattern, when meeting, battery dump energy is lower than 30% in power battery cabinet or vehicle is high
When pressure electricity, water chiller jumps out circulation pattern and stops working.
Further, the step 4 refrigeration mode comprising the following specific steps
(1) after entering refrigeration mode, triple valve is closed, then successively opens the condenser fan and compressor, the condensation
The initial launch revolving speed of fan and compressor is respectively n20 and n30；
(2) when meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, compressor is every 10 timing weeks
Phase W increases compressor rotary speed, and each incremental speed is 200r/min, until reach the operation of compressor highest working speed, and it is cold
Solidifying fan and electronic water pump work the high speed conditions in respectively；
(3) when meeting battery mean temperature T3 equal to target refrigeration opening temperature T6, compressor then keeps former revolving speed, and
Condenser fan and electronic water pump increase speed every 10 timing cycle W, and each revolving speed incremental change is 50r/min, until reaching
Each component highest working speed operation；
(4) when power battery mean temperature T3 is lower than target refrigeration opening temperature T6, compressor is every 20 timing cycle W
Compressor rotary speed is reduced, each revolving speed is reduced to 100r/min, and condenser fan and electronic water pump subtract every 20 timing cycle W
Small revolving speed, each revolving speed incremental change are 50r/min, until reaching each component initial speed operation；
(5) stop temperature T7, electronic water pump, condenser fan and compression when power battery mean temperature T3 reaches target refrigeration
Machine revolving speed is reduced to initial launch revolving speed n10, n20 and n30；
(6) when the inflow temperature T4 of inflow temperature sensor is lower than limiting temperature T10, control system exits refrigeration mode,
Compressor and condenser fan operation initial speed are respectivelyWithIt stops working after continuing 20 timing cycles, and returns to and follow
Ring mode.
Further, the step 5 heating mode comprising the following specific steps
(1) after entering heating mode, triple valve is opened, is then turned on ptc heater, water chiller is added using PTC ceramics
Thermal technology, according to battery thermal management system scheme, it is respectively P1, P2 and P3 that system, which designs four heating powers, and meets P1 >
P2 > P3 > 0；
(2) battery heating opening temperature T8 and heating stop setting a temperature threshold Z1 between temperature T9, work as power electric
For pond mean temperature T3 at (- 20, T8), PTC heating power is P1, and electronic water pump revolving speed is n13;
(3) when power battery mean temperature T3 is at (T8, Z1), PTC heating power is P2, and electronic water pump revolving speed is n12;
(4) when power battery mean temperature T3 is at (Z1, T9), PTC heating power is P3, and electronic water pump revolving speed is n11;
Wherein n13 > n12 > n11；
(3) PTC is then closed when power battery mean temperature T3 reaches heating stopping temperature T9, closes triple valve, system is returned
To circulation pattern.
Further, battery operating current in the water chiller acquisition CAN bus, and calculated using ampere-hour integration method
The current heat exchange capacity of battery predicts battery temperature tendency in advance.
By the above-mentioned description of this invention it is found that compared to the prior art, the present invention has the advantages that
The present invention can not only effectively improve the degree of automation of power battery water chiller control, and flat according to battery
Equal temperature and target temperature real time contrast analyze, and adaptively adjust compressor, electronic water pump and condenser fan working speed, more
Directly locking power battery works long hours in optimum temperature range and the temperature difference range, and is predicted in advance by ampere-hour integral
Battery temperature tendency, the hysteresis of temperature acquisition can effectively be solved by increasing modifying factor, more efficient control power battery
Temperature equalization extends power battery service life, and effectively reduces water chiller operation power consumption.
Detailed description of the invention
Fig. 1 is the system architecture diagram of power battery 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.
Specific embodiment
Explanation is with reference to the accompanying drawings to further explain a specific embodiment of the invention.
As shown in Figures 1 to 4, a kind of power battery water chiller system, including water chiller and 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, power battery cabinet 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
6,7 series connection of plate heat exchanger is arranged；The ptc heater 8, triple valve 9, inflow temperature sensor 10, power battery cabinet
11, leaving water temperature sensors 12, water tank 13,14 series connection of electronic water pump setting, 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 established data communication by CAN bus and the water chiller and connected
It connects, which is equipped with a timer, timing cycle W, which sets there are four operating mode, respectively
Standby mode, circulation pattern, refrigeration mode and heating mode.
Further, the intelligent control method of the power battery water chiller system, comprising the following specific steps
Step 1: after the water chiller low pressure powers on, system enters standby mode, the pressure after detecting fault-free automatically
It contracts mechanical, electrical sub- water pump and condenser fan stops working；
Step 2: the water chiller controller receives battery cell minimum temperature T1, electricity in the power battery cabinet
The temperature of pond monomer maximum temperature T2 and each battery modules, and a whole set of battery mean temperature T3 is calculated, while the water chiller
Controller acquires the inflow temperature T4 of the inflow temperature sensor and the leaving water temperature T5 of leaving water temperature sensors respectively, setting
Target is freezed, and opening temperature T6, target refrigeration stop temperature T7, target heats opening temperature T8, heating stops temperature T9 and the limit
Temperature T10；
Step 3: it is higher than target refrigeration opening temperature T6 or warm lower than target heating unlatching when meeting battery mean temperature T3
The battery cell temperature difference for spending T8 or the Battery case is more than setting value, and the water chiller enters circulation pattern, control system
The electronic water pump is opened, running speed is initial setting speed n10, controls the flow of power battery cooling medium；
Step 4: after entering circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, by
Circulation pattern is cut into refrigeration mode；
Step 5: after entering circulation pattern, when meeting battery mean temperature T3 lower than target heating opening temperature T8, by
Circulation pattern is cut into heating mode；
Step 6: after entering circulation pattern, when inflow temperature T4 and the leaving water temperature sensing for meeting inflow temperature sensor
It is more than set temperature that the leaving water temperature T5 of device, which reaches battery cell the temperature difference range in set temperature or power battery cabinet, by following
Ring mode is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7: after entering circulation pattern, when meeting, battery dump energy is lower than 30% in power battery cabinet or vehicle is high
When pressure electricity, water chiller jumps out circulation pattern and stops working.
Further, the step 4 refrigeration mode comprising the following specific steps
(1) after entering refrigeration mode, triple valve is closed, then successively opens the condenser fan and compressor, the condensation
The initial launch revolving speed of fan and compressor is respectively n20 and n30；
(2) when meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, compressor is every 10 timing weeks
Phase W increases compressor rotary speed, and each incremental speed is 200r/min, until reach the operation of compressor highest working speed, and it is cold
Solidifying fan and electronic water pump work the high speed conditions in respectively；
(3) when meeting battery mean temperature T3 equal to target refrigeration opening temperature T6, compressor then keeps former revolving speed, and
Condenser fan and electronic water pump increase speed every 10 timing cycle W, and each revolving speed incremental change is 50r/min, until reaching
Each component highest working speed operation；
(4) when power battery mean temperature T3 is lower than target refrigeration opening temperature T6, compressor is every 20 timing cycle W
Compressor rotary speed is reduced, each revolving speed is reduced to 100r/min, and condenser fan and electronic water pump subtract every 20 timing cycle W
Small revolving speed, each revolving speed incremental change are 50r/min, until reaching each component initial speed operation；
(5) stop temperature T7, electronic water pump, condenser fan and compression when power battery mean temperature T3 reaches target refrigeration
Machine revolving speed is reduced to initial launch revolving speed n10, n20 and n30；
(6) when the inflow temperature T4 of inflow temperature sensor is lower than limiting temperature T10, control system exits refrigeration mode,
Compressor and condenser fan operation initial speed are respectivelyWithIt stops working after continuing 20 timing cycles, and returns to and follow
Ring mode.
Further, the step 5 heating mode comprising the following specific steps
(1) after entering heating mode, triple valve is opened, is then turned on ptc heater, water chiller is added using PTC ceramics
Thermal technology, according to battery thermal management system scheme, it is respectively P1, P2 and P3 that system, which designs four heating powers, and meets P1 >
P2 > P3 > 0；
(2) battery heating opening temperature T8 and heating stop setting a temperature threshold Z1 between temperature T9, work as power electric
For pond mean temperature T3 at (- 20, T8), PTC heating power is P1, and electronic water pump revolving speed is n13;
(3) when power battery mean temperature T3 is at (T8, Z1), PTC heating power is P2, and electronic water pump revolving speed is n12;
(4) when power battery mean temperature T3 is at (Z1, T9), PTC heating power is P3, and electronic water pump revolving speed is n11;
Wherein n13 > n12 > n11；
(3) PTC is then closed when power battery mean temperature T3 reaches heating stopping temperature T9, closes triple valve, system is returned
To circulation pattern.
Further, battery operating current in the water chiller acquisition CAN bus, and calculated using ampere-hour integration method
The current heat exchange capacity of battery predicts battery temperature tendency in advance.
The present invention can not only effectively improve the degree of automation of power battery water chiller control, and flat according to battery
Equal temperature and target temperature real time contrast analyze, and adaptively adjust compressor, electronic water pump and condenser fan working speed, more
Directly locking power battery works long hours in optimum temperature range and the temperature difference range, and is predicted in advance by ampere-hour integral
Battery temperature tendency, the hysteresis of temperature acquisition can effectively be solved by increasing modifying factor, more efficient control power battery
Temperature equalization extends power battery service life, and effectively reduces water chiller operation power consumption.
The above is only a specific embodiment of the present invention, but design concept of the invention is not limited merely to this, all benefits
The present invention is improved with carrying out unsubstantiality with this design, should be belonged to behavior that violates the scope of protection of the present invention.
Claims (3)
1. a kind of power battery water chiller system, it is characterised in that: including water chiller and water chiller controller, the water
Cold group includes that compressor, pressure switch, condenser, condenser fan, liquid storage drying chamber, expansion valve, plate heat exchanger, PTC add
Hot device, triple valve, inflow temperature sensor, power battery cabinet, 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 setting；The PTC adds
Hot device is set with triple valve, inflow temperature sensor, power battery cabinet, leaving water temperature sensors, water tank, electronic water pump series connection
It sets, and is in parallel by the triple valve and the plate heat exchanger and connects setting, the water chiller controller passes through CAN bus
It establishes data communication with the water chiller to connect, which is equipped with a timer, timing cycle W, the water
Cold group is set there are four operating mode, respectively standby mode, circulation pattern, refrigeration mode and heating mode；
The intelligent control method of the power battery water chiller system, comprising the following specific steps
Step 1: after the water chiller low pressure powers on, system enters standby mode, the compression after detecting fault-free automatically
Mechanical, electrical sub- water pump and condenser fan stop working；
Step 2: the water chiller controller receives battery cell minimum temperature T1, battery list in the power battery cabinet
The temperature of body maximum temperature T2 and each battery modules, and a whole set of battery mean temperature T3 is calculated, while the water chiller controls
Device acquires the inflow temperature T4 of the inflow temperature sensor and the leaving water temperature T5 of leaving water temperature sensors respectively, and target is arranged
Freezing, opening temperature T6, target refrigeration stop temperature T7, target heats opening temperature T8, heating stops temperature T9 and limiting temperature
T10；
Step 3: it is higher than target refrigeration opening temperature T6 or lower than target heating opening temperature T8 when meeting battery mean temperature T3
Or the battery cell temperature difference of the power battery cabinet is more than setting value, the water chiller enters circulation pattern, control system
The electronic water pump is opened, running speed is initial setting speed n10, controls the flow of power battery cooling medium；
Step 4: after entering circulation pattern, when meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, by recycling
Mode is cut into refrigeration mode；
Step 5: after entering circulation pattern, when meeting battery mean temperature T3 lower than target heating opening temperature T8, by recycling
Mode is cut into heating mode；
Step 6: after entering circulation pattern, when the inflow temperature T4's and leaving water temperature sensors for meeting inflow temperature sensor
It is more than set temperature that leaving water temperature T5, which reaches battery cell the temperature difference range in set temperature or power battery cabinet, by cyclic module
Formula is cut into the electronic water pump and condenser fan all runs at high speed；
Step 7: after entering circulation pattern, it is lower than under 30% or vehicle high pressure when meeting battery dump energy in power battery cabinet
When electric, water chiller jumps out circulation pattern and stops work；
After the refrigeration mode of the step 4 is comprising the following specific steps (1) enter refrigeration mode, triple valve is closed, then first
After open the condenser fan and compressor, the initial launch revolving speed of the condenser fan and compressor is respectively n20 and n30；(2)
When meeting battery mean temperature T3 higher than target refrigeration opening temperature T6, compressor increases compression every 10 timing cycle W
Machine revolving speed, each incremental speed are 200r/min, until reach the operation of compressor highest working speed, and condenser fan and electronics
Water pump is worked respectively in middle high speed conditions；
(3) when meeting battery mean temperature T3 equal to target refrigeration opening temperature T6, compressor then keeps former revolving speed, and condenses
Fan and electronic water pump increase speed every 10 timing cycle W, and each revolving speed incremental change is 50r/min, until reaching each portion
The operation of part highest working speed；
(4) when power battery mean temperature T3 is lower than target refrigeration opening temperature T6, compressor is reduced every 20 timing cycle W
Compressor rotary speed, each revolving speed is reduced to 100r/min, and condenser fan and electronic water pump turn every 20 timing cycle W reductions
Speed, each revolving speed decrement are 50r/min, until reaching each component initial speed operation；
(5) stop temperature T7 when power battery mean temperature T3 reaches target refrigeration, electronic water pump, condenser fan and compressor turn
Prompt drop is as low as initial launch revolving speed n10, n20 and n30；
(6) when the inflow temperature T4 of inflow temperature sensor is lower than limiting temperature T10, control system exits refrigeration mode, compresses
Machine and condenser fan operation initial speed are respectively to stop working after n30 and n20 continues 20 timing cycles, and return to cyclic module
Formula.
2. the intelligent control method of power battery water chiller system according to claim 1, it is characterised in that: the step
Rapid five heating mode comprising the following specific steps
(1) after entering heating mode, triple valve is opened, is then turned on ptc heater, water chiller heats skill using PTC ceramics
Art, according to battery thermal management system scheme, it is respectively P1, P2 and P3 that system, which designs three heating powers, and meets P1 > P2 >
P3 > 0；
(2) battery heating opening temperature T8 and heating stop setting a temperature threshold Z1 between temperature T9, when power battery is flat
For equal temperature T3 at (- 20 °C, T8), PTC heating power is P1, and electronic water pump revolving speed is n13;
(3) when power battery mean temperature T3 is at (T8, Z1), PTC heating power is P2, and electronic water pump revolving speed is n12;
(4) when power battery mean temperature T3 is at (Z1, T9), the heating power of ptc heater is P3, and electronic water pump revolving speed is
n11 ;Wherein n13 > n12 > n11；
(5) ptc heater is then closed when power battery mean temperature T3 reaches heating stopping temperature T9, closes triple valve, system
Return to circulation pattern.
3. the intelligent control method of power battery water chiller system according to claim 1, it is characterised in that: the water
Cold group acquires battery operating current in CAN bus, and calculates the current heat exchange capacity of battery using ampere-hour integration method,
Battery temperature tendency is predicted in advance.
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