CN108963379B - Temperature consistency control system and control method for power battery of new energy automobile - Google Patents
Temperature consistency control system and control method for power battery of new energy automobile Download PDFInfo
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- CN108963379B CN108963379B CN201810638427.2A CN201810638427A CN108963379B CN 108963379 B CN108963379 B CN 108963379B CN 201810638427 A CN201810638427 A CN 201810638427A CN 108963379 B CN108963379 B CN 108963379B
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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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- 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
- H01M10/615—Heating or keeping warm
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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
- H01M10/63—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
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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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
- H01M10/6554—Rods or plates
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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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- 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
Abstract
The invention relates to a temperature consistency control system and a control method for a power battery of a new energy automobile, wherein the system comprises a first expansion kettle, a first water pump, a first three-way water valve, a PTC water heating heater, a first cooling water temperature sensor, a battery cooling plate, a second cooling water temperature sensor, a battery cooler, a second three-way water valve and a first expansion kettle which are sequentially connected to form a battery heating/cooling water circulation loop, the battery cooling plate is arranged at the power battery, a plurality of battery temperature sensors which are respectively connected with each electric core inside the power battery are arranged in the power battery, a circulation branch which is connected with two ends of a series circuit of the first water pump and the first expansion kettle in parallel is also arranged between the first three-way water valve and the second three-way water valve, and a second expansion kettle and a second water pump are arranged on the circulation branch. Compared with the prior art, the water cooling plate water inlet and the water outlet are switched, so that the temperature of the power battery cell of the new energy automobile is kept to be consistent, and the service life of the battery is prolonged.
Description
Technical Field
The invention relates to a whole electric automobile heat management technology, in particular to a new energy automobile power battery temperature consistency control system and a control method.
Background
The technology of the electric automobile is changed day by day, and the power battery is used as a power source of the electric automobile and is an important core component of the electric automobile, so that the running state of the power battery is very important. It is well known that batteries are electrochemical products and that the quality of temperature control of the battery directly affects the operating state of the battery. If the temperature of the battery is too low, the activity of the battery is reduced, and the working efficiency is reduced; if the temperature of the battery is too high, the service life of the battery and the driving safety can be influenced; if the temperature difference of the battery inner cells is too large, the service life of the battery can be influenced. Therefore, the temperature control of the power battery is sensitive, heating is needed at low temperature, and cooling is needed at high temperature.
The main battery temperature control system in the market at present adopts a liquid cooling mode, and the heating and cooling of the power battery mainly depend on a high-pressure water heater and a battery cooler (a battery radiator), and the power battery is heated and cooled by heating and cooling liquid of a battery water cooling plate and using a water pump to enable the liquid to circularly flow. A common battery temperature control loop is shown in fig. 1, and a common battery cooling plate scheme is shown in fig. 2-4.
The power battery is integrated by a plurality of battery cells, the battery cells are often inconsistent in temperature distribution due to charge and discharge or self faults in the running process of the electric automobile, the water inlet and the water outlet of the battery water cooling plate with the traditional liquid cooling scheme are locked after the design is completed, the heat exchange efficiency of cooling liquid and the battery is ensured in the subsequent long-time battery heating and cooling process, the temperature distribution of the water cooling plate is uneven, so that the temperature distribution of the battery cells of different batteries is uneven, and particularly the battery cells close to the water inlet and the water outlet of the battery water cooling plate can have adverse effects on the service life of the battery and the consistency of the battery cells if a large temperature difference exists for a long time.
The main control method for heating and cooling the battery at present comprises the following steps: when the maximum value Tmax of the battery cell temperature is higher than the set value T1 of the battery cell, the battery cooling function is started and is closed until the maximum value Tmax of the battery cell temperature is lower than the set value T2 of the battery cell. When the minimum value Tmin in the battery cell temperature is lower than the cell set value T3, the battery heating function is started until the maximum value Tmin in the battery cell temperature is higher than the cell set value T4. During the cooling process of the battery, the influence of the consistency and service life of the battery cells caused by the lowest temperature of the battery cells and the temperature difference between the battery cells is ignored. Similarly, the cell consistency and life impact caused by the highest temperature of the cells and the temperature difference between the cells are ignored in the heating process of the battery.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a temperature consistency control system and a control method for a power battery of a new energy automobile.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a new energy automobile power battery temperature uniformity control system, includes the first expansion kettle, first water pump, first tee bend water valve, PTC hot-water heating heater, first cooling water temperature sensor, battery cooling plate, second cooling water temperature sensor, battery cooler, second tee bend water valve, first expansion kettle that connect gradually and form battery heating/cooling water circulation loop, battery cooling plate locates power battery department, be equipped with a plurality of battery temperature sensors that are connected with each electric core inside the power battery respectively in the power battery, still be equipped with the circulation branch way that connects in parallel with the both ends of first water pump and first expansion kettle serial line between first tee bend water valve and the second tee bend water valve, be equipped with second expansion kettle and second water pump on the circulation branch way, battery cooler still connects in the refrigerant circulation loop;
the battery temperature sensor, the first water pump, the first three-way water valve, the second water pump, the second three-way water valve, the battery cooler, the PTC water heating heater, the first cooling water temperature sensor and the second cooling water temperature sensor are all connected with the controller.
Preferably, the refrigerant circulation loop comprises a compressor, a pressure sensor, a battery radiating component, a first electromagnetic expansion valve, a battery cooler and a compressor which are sequentially connected to form the circulation loop, and the compressor, the pressure sensor, the condenser and the battery radiating component are all connected with the controller.
Preferably, the battery cooling assembly comprises a condenser and a cooling fan, and the condenser is respectively connected with the pressure sensor and the first electromagnetic expansion valve.
Preferably, the passenger cabin cooling assembly further comprises an evaporator, a blower and a second electromagnetic expansion valve, wherein one end of the evaporator is connected to a circuit between the battery cooler and the compressor, the other end of the evaporator is connected with one end of the second electromagnetic expansion valve, the other end of the second electromagnetic expansion valve is connected to a circuit between the first electromagnetic expansion valve and the battery radiating assembly, and the blower is arranged at the evaporator.
The control method of the new energy automobile power battery temperature control system comprises two battery cooling water circulation paths:
first battery cooling water flow path: the system comprises a first expansion kettle, a first water pump, a first three-way water valve, a PTC water heating heater, a first cooling water temperature sensor, a battery cooling plate, a second cooling water temperature sensor, a battery cooler, a second three-way water valve and a first expansion kettle;
second battery cooling water flow path: the second expansion kettle, a second water pump, a second three-way water valve, a battery cooler, a second cooling water temperature sensor, a battery cooling plate, a first cooling water temperature sensor, a PTC water heating heater, a first three-way water valve and a second expansion kettle;
the controller starts a battery heating or cooling function according to a temperature signal acquired by a battery temperature sensor, when the battery heating or cooling function is started, battery cooling water runs according to the first battery cooling water flow path, and the controller adjusts power according to a set temperature and the actual temperature of the power battery; in the process of opening and closing the battery heating or cooling function, when the difference value between the acquired highest temperature Tmax and the acquired lowest temperature Tmin of the battery core is larger than or equal to a set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference value between the highest temperature and the lowest temperature of the battery core is smaller than the set value.
Preferably, in the process of starting the battery heating or cooling function, when the difference between the highest temperature and the lowest temperature of the collected battery cell is greater than or equal to a set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference between the highest temperature and the lowest temperature of the battery cell is less than the set value, and the process specifically includes:
a) If the delta T=Tmax-Tmin is larger than or equal to eta, the battery cooling water flow path is switched to a second battery cooling water flow path; b) Detecting the delta T again after lasting for X minutes, if the delta T is smaller than eta, maintaining the current cooling water flow path, otherwise, switching to the other battery cooling water flow path; c) Repeating step b) until deltat is less than the set value; η is the maximum allowable temperature difference between each cell calibrated according to the cell characteristics during the start of the battery heating or cooling function.
Preferably, in the process of closing the battery heating or cooling function, when the difference between the highest temperature and the lowest temperature of the collected battery cell is greater than or equal to the set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference between the highest temperature and the lowest temperature of the battery cell is less than the set value, and the process specifically includes:
if the delta T is detected to be more than or equal to theta, the battery cooling water runs according to the first battery cooling water flow path; b') detecting the DeltaT again after lasting for Y minutes, if DeltaT is smaller than theta, turning off the water pump, and if DeltaT is larger than or equal to theta and the positions of the electric cores to which Tmax and Tmin belong are changed, switching the battery cooling water circulation path to the other one; c ') repeating step b') until Δt is less than the set value; θ is the maximum allowable temperature difference between each cell calibrated according to the cell characteristics during the shutdown of the battery heating or cooling function.
Compared with the prior art, the invention provides a scheme and a switching method for the water inlet and outlet switching system of the water cooling plate, which are used for adjusting the temperature distribution of the water cooling plate and the rotating speed of the water pump by switching the water inlet and the water outlet of the water cooling plate and balancing the temperature difference of inlet and outlet water when the temperature inconsistency occurs in the battery core, and the invention is used for solving the problem of poor consistency of the temperature of the battery core caused by overlarge difference between the highest temperature and the lowest temperature of the battery core on the basis of the heating and cooling functions of the conventional battery, so that the temperature of the battery core at the water inlet and the water outlet of the water cooling plate is prevented from being unevenly distributed for a long time, the good consistency of the temperature of the battery core of the power battery of the new energy automobile is maintained, and the service life of the battery is prolonged.
Drawings
FIG. 1 is a schematic diagram of a prior art battery temperature control loop;
FIG. 2 is a schematic view of a prior art harmonica-type battery cooling plate;
FIG. 3 is a schematic diagram of a 18650-type battery cooling panel according to the prior art;
FIG. 4 is a schematic view of a prior art extruded panel battery cooling panel;
fig. 5 is a schematic diagram of a temperature control system for a power battery according to the present invention.
The drawing is marked: 1. the power battery, 2, a second cooling water temperature sensor, 3, a battery cooler, 4, a second three-way water valve, 5, a first expansion kettle, 6, a first water pump, 7, a first three-way water valve, 8, a PTC water heating heater, 9, a first cooling water temperature sensor, 10, a battery temperature sensor, 11, a second expansion kettle, 12, a second water pump, 13, a compressor, 14, a pressure sensor, 15, a condenser, 16, a cooling fan, 17, a first electromagnetic expansion valve, 18, a second electromagnetic expansion valve, 19, an evaporator, 20 and a blower.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Examples
As shown in fig. 5, the power battery temperature consistency control system of the new energy automobile comprises a first expansion kettle 5, a first water pump 6, a first three-way water valve 7, a PTC water heating heater 8, a first cooling water temperature sensor 9, a battery cooling plate, a second cooling water temperature sensor 2, a battery cooler 3, a second three-way water valve 4 and a first expansion kettle 5 which are sequentially connected to form a battery heating/cooling water circulation loop. The battery cooling plate is arranged at the power battery 1, and a plurality of battery temperature sensors 10 respectively connected with each battery cell inside the power battery 1 are arranged in the power battery 1. A circulation branch connected with the two ends of the serial circuit of the first water pump 6 and the first expansion kettle 5 in parallel is also arranged between the first three-way water valve 7 and the second three-way water valve 4, and a second expansion kettle 11 and a second water pump 12 are arranged on the circulation branch.
The system heats the battery by heating the liquid in the water cooling plate through the PTC water heating heater 8, and cools the battery by cooling the liquid in the water cooling plate through the battery cooler 3. The battery temperature sensor 10, the first water pump 6, the first three-way water valve 7, the second water pump 12, the second three-way water valve 4, the battery cooler 3, the PTC water heating heater 8, the first cooling water temperature sensor 9 and the second cooling water temperature sensor 2 are all connected with a controller. Wherein the rotational speed of the first water pump 6 and the second water pump 12 is adjustable. The controller starts the battery heating or cooling function according to the temperature signal collected by the battery temperature sensor 10: when the maximum value Tmax of the battery cell temperature is monitored to be higher than the set value T1 of the battery cell, the battery cooling function is started until the maximum value Tmax of the battery cell temperature is lower than the set value T2 of the battery cell; when the minimum value Tmin in the battery cell temperature is monitored to be lower than the cell set value T3, the battery heating function is started until the maximum value Tmin in the battery cell temperature is monitored to be higher than the cell set value T4.
The battery cooler 3 is further connected to a refrigerant circulation loop, in this embodiment, the refrigerant circulation loop includes a compressor 13, a pressure sensor 14, a battery heat dissipation assembly, a first electromagnetic expansion valve 17, the battery cooler 3, and the compressor 13, which are sequentially connected to form a circulation loop, and the compressor 13, the pressure sensor 14, the condenser 15, and the battery heat dissipation assembly are all connected to a controller. The battery heat dissipation assembly includes a condenser 15 and a cooling fan 16, the condenser 15 is connected with the pressure sensor 14 and the first electromagnetic expansion valve 17, respectively, and the cooling fan 16 is provided at the condenser 15.
In this embodiment, the system further comprises a passenger cabin cooling assembly, the passenger cabin cooling assembly comprises an evaporator 19, a blower 20 and a second electromagnetic expansion valve 18, one end of the evaporator 19 is connected to a line between the battery cooler 3 and the compressor 13, the other end of the evaporator is connected to one end of the second electromagnetic expansion valve 18, the other end of the second electromagnetic expansion valve 18 is connected to a line between the first electromagnetic expansion valve 17 and the battery cooling assembly, and the blower 20 is disposed at the evaporator 19. Opening the second electromagnetic expansion valve 18 may effect cooling of the passenger compartment.
The control method of the power battery temperature control system of the new energy automobile establishes two circulation paths of battery cooling water, and controls the opening and closing of the water pump and the valve through a reasonable switching control method, so that good consistency of the temperature distribution of the battery cooling plate is achieved. The two battery cooling water flow paths are as follows:
the first battery cooling water flow path starts the first water pump 6 to run, the second water pump 12 does not work, the first three-way water valve 7 is led to the direction of the PTC water heating heater 8, the second three-way water valve 4 is led to the direction of the first expansion kettle 5, and the cooling water flow loop is formed as follows: the water heating device comprises a first expansion kettle 5, a first water pump 6, a first three-way water valve 7, a PTC water heating heater 8, a first cooling water temperature sensor 9, a battery cooling plate, a second cooling water temperature sensor 2, a battery cooler 3, a second three-way water valve 4 and a first expansion kettle 5.
The second battery cooling water flow path starts the second water pump 12 to operate, the first water pump 6 does not work, the second three-way water valve 4 is led to the direction of the second expansion kettle 11, the second three-way water valve 4 is led to the direction of the battery cooler 3, and the cooling water flow loop is formed as follows: the second expansion kettle 11, the second water pump 12, the second three-way water valve 4, the battery cooler 3, the second cooling water temperature sensor 2, the battery cooling plate, the first cooling water temperature sensor 9, the PTC water heating heater 8, the first three-way water valve 7 and the second expansion kettle 11.
When the battery heating or cooling function is started, the battery cooling water runs according to the first battery cooling water flow path, and the controller adjusts the power of the compressor 13 or the PTC water heating heater 8 according to the set temperature and the actual temperature of the power battery 1; in the process of opening and closing the battery heating or cooling function, when the difference value between the acquired highest temperature Tmax and the acquired lowest temperature Tmin of the battery core is larger than or equal to a set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference value between the highest temperature and the lowest temperature of the battery core is smaller than the set value.
The method for switching the first and second battery cooling water circulation paths during the starting of the battery heating or cooling function specifically comprises the following steps:
a) If the fact that delta T=Tmax-Tmin is larger than or equal to eta is detected, the fact that the temperature difference between the electric cores of the power battery 1 is large is indicated, a battery cooling water flow path is switched to a second battery cooling water flow path, and the rotating speed of the second water pump 12 is adjusted; b) Detecting the delta T again after lasting for X minutes, if the delta T is smaller than eta, maintaining the current cooling water flow path, otherwise, switching to the other battery cooling water flow path; c) Repeating step b) until deltat is less than the set point.
When the battery has no heating and cooling requirements, temperature deviation caused by uneven charging and discharging and the like can also exist among the battery cells of the power battery 1, and in the process of closing the battery heating or cooling function, the method for switching the first battery cooling water flow path and the second battery cooling water flow path comprises the following steps:
a') if the delta T is larger than or equal to theta, starting the first water pump 6, running the battery cooling water according to the first battery cooling water flow path, and adjusting the rotating speed of the first water pump 6; b') detecting the DeltaT again after lasting for Y minutes, if DeltaT is smaller than theta, turning off the water pump, and if DeltaT is larger than or equal to theta and the positions of the electric cores to which Tmax and Tmin belong are changed, switching the battery cooling water circulation path to the other one; c ') repeating step b') until Δt is less than the set value. θ is the maximum allowable temperature difference between each cell calibrated according to the cell characteristics during the shutdown of the battery heating or cooling function.
In the embodiment, the switching process of the water inlet and the water outlet of the battery cooling plate is successfully simulated according to the simulation result of Computer Aided Engineering (CAE) software on the temperature field of the water cooling plate and the actual temperature distribution test.
The switching time intervals X and Y and the rotating speed of each water pump are calibrated and calculated through the simulation result of the water cooling plate temperature field and the actual temperature distribution test.
Claims (6)
1. The power battery temperature consistency control system of the new energy automobile is characterized by comprising a first expansion kettle, a first water pump, a first three-way water valve, a PTC water heating heater, a first cooling water temperature sensor, a battery cooling plate, a second cooling water temperature sensor, a battery cooler and a second three-way water valve which are sequentially connected to form a battery heating/cooling water circulation loop, wherein the battery cooling plate is arranged at a power battery, a plurality of battery temperature sensors which are respectively connected with each electric core inside the power battery are arranged in the power battery, a circulation branch which is connected with two ends of a series circuit of the first water pump and the first expansion kettle in parallel is further arranged between the first three-way water valve and the second three-way water valve, a second expansion kettle and a second water pump are arranged on the circulation branch, and the battery cooler is further connected in a refrigerant circulation loop;
the battery temperature sensor, the first water pump, the first three-way water valve, the second water pump, the second three-way water valve, the battery cooler, the PTC water heating heater, the first cooling water temperature sensor and the second cooling water temperature sensor are all connected with the controller;
the control method of the system comprises two battery cooling water circulation paths:
first battery cooling water flow path: the system comprises a first expansion kettle, a first water pump, a first three-way water valve, a PTC water heating heater, a first cooling water temperature sensor, a battery cooling plate, a second cooling water temperature sensor, a battery cooler, a second three-way water valve and a first expansion kettle;
second battery cooling water flow path: the second expansion kettle, a second water pump, a second three-way water valve, a battery cooler, a second cooling water temperature sensor, a battery cooling plate, a first cooling water temperature sensor, a PTC water heating heater, a first three-way water valve and a second expansion kettle;
the controller starts a battery heating or cooling function according to a temperature signal acquired by a battery temperature sensor, when the battery heating or cooling function is started, battery cooling water runs according to the first battery cooling water flow path, and the controller adjusts power according to a set temperature and the actual temperature of the power battery; in the process of opening and closing the battery heating or cooling function, when the difference value between the acquired highest temperature Tmax and the acquired lowest temperature Tmin of the battery core is larger than or equal to a set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference value between the highest temperature and the lowest temperature of the battery core is smaller than the set value.
2. The system of claim 1, wherein the refrigerant circulation loop comprises a compressor, a pressure sensor, a battery heat dissipation assembly, a first electromagnetic expansion valve, and a battery cooler, all connected in sequence to form a circulation loop, and the compressor, the pressure sensor, and the battery heat dissipation assembly are connected to the controller.
3. The system of claim 2, wherein the battery cooling assembly comprises a condenser and a cooling fan, the condenser is respectively connected with the pressure sensor and the first electromagnetic expansion valve, and the condenser is connected with the controller.
4. The system of claim 2, further comprising a passenger compartment cooling assembly comprising an evaporator, a blower and a second electromagnetic expansion valve, wherein one end of the evaporator is connected to a line between the battery cooler and the compressor, and the other end of the evaporator is connected to one end of the second electromagnetic expansion valve, and the other end of the second electromagnetic expansion valve is connected to a line between the first electromagnetic expansion valve and the battery heat sink assembly, and the blower is disposed at the evaporator.
5. The system according to claim 1, wherein, in the process of starting the battery heating or cooling function, when the difference between the highest temperature and the lowest temperature of the collected battery cells is greater than or equal to a set value, the controller continuously switches the first battery cooling water circulation path and the second battery cooling water circulation path until the difference between the highest temperature and the lowest temperature of the battery cells is less than the set value, the process specifically comprises:
a) If the delta T=Tmax-Tmin is larger than or equal to eta, the battery cooling water flow path is switched to a second battery cooling water flow path; b) Detecting the delta T again after lasting for X minutes, if the delta T is smaller than eta, maintaining the current cooling water flow path, otherwise, switching to the other battery cooling water flow path; c) Repeating step b) until deltat is less than the set value; η is the maximum allowable temperature difference between each cell calibrated according to the cell characteristics during the start of the battery heating or cooling function.
6. The system according to claim 1, wherein the controller continuously switches the first battery cooling water flow path and the second battery cooling water flow path until the difference between the highest temperature and the lowest temperature of the battery cells is smaller than the set value when the difference between the highest temperature and the lowest temperature of the collected battery cells is greater than or equal to the set value during the closing of the battery heating or cooling function, and the method specifically comprises:
if the delta T is detected to be more than or equal to theta, the battery cooling water runs according to the first battery cooling water flow path; b') detecting the DeltaT again after lasting for Y minutes, if DeltaT is smaller than theta, turning off the water pump, and if DeltaT is larger than or equal to theta and the positions of the electric cores to which Tmax and Tmin belong are changed, switching the battery cooling water circulation path to the other one; c ') repeating step b') until Δt is less than the set value; θ is the maximum allowable temperature difference between each cell calibrated according to the cell characteristics during the shutdown of the battery heating or cooling function.
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| CN201810638427.2A CN108963379B (en) | 2018-06-20 | 2018-06-20 | Temperature consistency control system and control method for power battery of new energy automobile |
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| CN201810638427.2A CN108963379B (en) | 2018-06-20 | 2018-06-20 | Temperature consistency control system and control method for power battery of new energy automobile |
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| CN109768347A (en) * | 2018-12-10 | 2019-05-17 | 山东国金汽车制造有限公司 | One kind being based on bicirculating power battery pack heat management system |
| CN109659633B (en) * | 2018-12-17 | 2021-08-27 | 青岛港国际股份有限公司 | Automatic dock AGV battery temperature maintenance device and method |
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