CN108346841B - Power battery temperature control system and method - Google Patents

Power battery temperature control system and method Download PDF

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Publication number
CN108346841B
CN108346841B CN201810150170.6A CN201810150170A CN108346841B CN 108346841 B CN108346841 B CN 108346841B CN 201810150170 A CN201810150170 A CN 201810150170A CN 108346841 B CN108346841 B CN 108346841B
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temperature value
controlling
work
circulation loop
temperature control
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CN108346841A (en
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徐国胜
张欢欢
宋军
刘洪思
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a power battery temperature control system and a power battery temperature control method, wherein the power battery temperature control system comprises a temperature control unit, a first pipeline, a second pipeline, an air conditioning module and a radiator; the temperature control unit is formed by sequentially communicating a liquid-gas separator, a heater, a cooling plate and a water pump; the cooling plate is tightly attached to the power battery; two ends of the first pipeline are respectively communicated with two ends of the temperature control unit to form a heating circulation loop; two ends of the second pipeline are respectively communicated with two ends of the temperature control unit to form a first cooling circulation loop; the air conditioning module at least comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger is connected in series with the second pipeline; and two ends of the radiator are respectively communicated with two ends of the temperature control unit to form a second cooling circulation loop. The invention can control the temperature of the power battery in a smaller range, and is beneficial to improving the working efficiency of the power battery.

Description

Power battery temperature control system and method
Technical Field
The invention relates to the technical field of automobiles, in particular to a power battery temperature control system and method.
Background
With the increasing severity of energy and environmental problems, energy-saving and environment-friendly concepts are deeply enjoyed, and electric automobiles have the remarkable advantages of energy conservation, environmental protection and the like, and are highly concerned in the world. The power battery is one of the core components of the electric automobile as a power source, and due to the inherent characteristics of the power battery, the charging and discharging capacity of the power battery is greatly influenced by the temperature, so that the performance of the automobile is directly influenced, and the service life of the power battery is also influenced. The thermal management of the existing power battery system can be divided into natural cooling, air cooling and liquid cooling. Compare natural cooling and forced air cooling, the liquid cooling advantage is showing, and the cooling or the heating efficiency of battery is higher, can effectively control battery temperature in suitable within range, can guarantee that the temperature difference change of electric core is little, extension battery life.
In the existing liquid cooling battery system, a battery heating device adopts a cooling loop outside a battery box and is connected with an electric water heating device in parallel, and the power supply of the electric water heating device can be provided by a vehicle-mounted charger and a high-voltage battery. The battery cooling is cooling water that exchanges heat using a front compartment radiator. The temperature control only makes a cooling strategy according to the battery temperature collected by a Battery Management System (BMS), when the battery temperature is higher than a threshold value t1, quick cooling is started, when the battery temperature is lower than a threshold value t1 but higher than a threshold value t2, slow cooling is started, and when the battery temperature is lower than a threshold value t2, cooling is closed and heating is started.
How to arrange a simple liquid-cooling power battery system, perfect a heat management strategy, efficiently control the battery temperature within a narrow range, and improve the battery efficiency is a technical problem to be urgently solved by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a power battery temperature control system and a power battery temperature control method, which are used for solving the defects in the prior art, can control the temperature of a power battery within a narrow range and greatly improve the thermal efficiency.
The invention provides a power battery temperature control system, which comprises:
the temperature control unit is formed by sequentially communicating a liquid-gas separator, a heater, a cooling plate and a water pump; the cooling plate is tightly attached to the power battery;
the first pipeline and the pipelines in the temperature control unit and the temperature control unit form a heating circulation loop together;
the second pipeline and the pipelines in the temperature control unit and the temperature control unit form a first cooling circulation loop together;
the air conditioning module at least comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger is connected in series with the second pipeline; and
and the radiator and the pipelines in the temperature control unit and the temperature control unit jointly form a second cooling circulation loop.
The power battery temperature control system as described above, wherein preferably, the first pipeline, the second pipeline and the radiator are all communicated with the water pump through electromagnetic valves.
The power battery temperature control system as described above, wherein preferably, the first pipeline, the second pipeline and the radiator are communicated with the outlet of the water pump through the same four-way valve;
the four-way valve is provided with a water inlet, a first water outlet, a second water outlet and a third water outlet; the water inlet is communicated with the outlet of the water pump; the first water outlet is communicated with the first pipeline, the second water outlet is communicated with the second pipeline, and the third water outlet is communicated with the radiator.
The power battery temperature control system as described above, preferably, further includes a replenishment kettle disposed in the second cooling circulation circuit.
The power battery temperature control system as described above, wherein preferably, the air conditioning module further includes a compressor, a condenser, a dryer, a first solenoid valve, and a first expansion valve;
the compressor, the condenser, the dryer, the first electromagnetic valve, the first expansion valve and the liquid-liquid heat exchanger are sequentially connected end to form an air-conditioning refrigeration loop.
The power battery temperature control system as described above, wherein preferably, the power battery comprises a plurality of closely arranged battery cells and an integrated housing;
the battery monomer with the cooling plate all sets up in the integration casing.
The invention also provides a power battery temperature control method, which comprises the following steps:
s1, collecting temperature values of set positions on the power battery and environmental temperature values; calculating a maximum temperature value and a minimum temperature value in the acquired temperature values of the power battery;
s2, judging whether the environmental temperature value is less than the preset environmental temperature value; if yes, go to step S3; if not, go to step S4;
s3, judging whether the minimum temperature value is less than a first preset battery temperature value; if yes, controlling the heating circulation loop to work;
s4, judging whether the maximum temperature value is less than a second preset battery temperature value; and if not, controlling the first cooling circulation loop or the second cooling circulation loop to work.
The method as described above, wherein, preferably, the step S3 specifically includes the following steps:
s301, judging whether the minimum temperature value is smaller than a first preset battery temperature value and larger than or equal to a third preset battery temperature value or not, and if so, controlling the heater to work at 50% of the maximum power;
s302, judging whether the minimum temperature value is less than a third preset battery temperature value and greater than or equal to a fourth preset battery temperature value or not, and if so, controlling the heater to work at 60% of the maximum power;
s303, judging whether the minimum temperature value is less than a fourth preset battery temperature value, if so, controlling the heater to work at the maximum power, and controlling the water pump to run at 60% of the maximum rotation speed; if not, go to step S304;
and S304, controlling the heater to stop working and controlling the water pump to stop working.
The method as described above, wherein, preferably, the step S4 specifically includes the following steps:
s401, judging whether the maximum temperature value is smaller than the second preset battery temperature value or not, and if so, entering a step S1;
s402, judging whether the maximum temperature value is smaller than a fifth preset battery temperature value or not, if so, controlling a second cooling circulation loop to work, controlling a water pump to work at a first rotating speed, and controlling a fan on a radiator to work;
s403, judging whether the maximum temperature value is smaller than a sixth preset battery temperature value, if so, controlling a second cooling circulation loop to work, and controlling a water pump to work at a second rotating speed; if not, go to step S404;
and S404, controlling the first cooling circulation loop to work, controlling the air conditioning module to work, and controlling the water pump to work at a second rotating speed.
The method as described above, wherein preferably, further comprising the steps of:
s5, judging whether the maximum temperature value is less than the preset emergency temperature value; if yes, go to step S1; if not, go to step S6;
and S6, controlling the second cooling circulation loop and the air conditioning module to work, and controlling the water pump to work at the highest rotating speed.
Compared with the prior art, the heating circulation loop is arranged, when the temperature of the power battery is too low, the liquid in the heating circulation loop is heated through the heater on the heating circulation loop, the liquid in the heating circulation loop is controlled to circularly flow through the water pump, and when the heated liquid passes through the cooling plate tightly attached to the power battery, the power battery can be heated. When the temperature of the power battery is too high, forced cooling is carried out through the first cooling circulation pipeline or ordinary heat dissipation is carried out through the second cooling circulation loop. Therefore, the temperature of the power battery can be accurately controlled through different circulation loops according to different requirements, the temperature of the power battery can be controlled within a narrow range, and the discharging efficiency of the power battery can be greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a power battery temperature control system according to the present invention;
FIG. 2 is a flow chart of the steps of the method proposed by the present invention;
FIG. 3 is a flowchart illustrating a specific step of step S3 according to the present invention;
FIG. 4 is a flowchart illustrating a specific step of step S4 according to the present invention;
fig. 5 is a flowchart of the steps of embodiment 3 of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Example 1
The embodiment of the invention comprises the following steps: as shown in fig. 1, fig. 1 is a schematic structural diagram of a power battery temperature control system according to the present invention; this embodiment specifically discloses a power battery temperature control system, wherein, includes: the temperature control unit, the first pipeline, the second pipeline, the air conditioning module and the radiator;
the temperature control unit is formed by sequentially communicating a liquid-gas separator, a heater, a cooling plate and a water pump; the cooling plate is tightly attached to the power battery;
two ends of the first pipeline are respectively communicated with two ends of the temperature control unit to form a heating circulation loop;
two ends of the second pipeline are respectively communicated with two ends of the temperature control unit to form a first cooling circulation loop;
the air conditioning module at least comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger is connected in series with the second pipeline;
and two ends of the radiator are respectively communicated with two ends of the temperature control unit to form a second cooling circulation loop.
When the temperature of the power battery is low, the heating circulation loop is controlled to work, the first cooling circulation loop and the second cooling circulation loop do not work, namely the heating circulation loop circulates, and the first cooling circulation loop and the second cooling circulation loop do not circulate; and controlling the heater and the water pump to work, heating the liquid in the heating circulation loop, and heating the power battery when the heated liquid passes through the cooling plate tightly attached to the power battery, so that the power battery reaches a proper temperature and the charge-discharge efficiency of the power battery is ensured. When the temperature of the power battery is higher, the second cooling circulation loop is controlled to work, the heating circulation loop and the first cooling circulation loop do not work, namely, the second cooling circulation loop circulates, the heating circulation loop and the first cooling circulation loop do not circulate, meanwhile, a fan on the radiator is controlled to work, the heater does not work, and the water pump works. At the moment, the liquid flowing through the cooling plate can cool the power battery; when the liquid passes through the radiator, the liquid exchanges heat with the outside air, the temperature of the liquid is reduced, and when the liquid flows onto the cooling plate again, the temperature of the power battery can be reduced, so that the circulation is repeated, and the power battery can perform common heat dissipation. When the temperature of the movable battery is too high, the first cooling circulation loop is controlled to work, the heating circulation loop and the second cooling circulation loop do not work, namely, the first cooling circulation loop circulates, the second cooling circulation loop and the heating circulation loop do not circulate, meanwhile, the air conditioning module is controlled to work, the water pump is controlled to work, liquid in the first cooling circulation loop is forcibly cooled through the liquid-liquid heat exchanger in the air conditioning module, the heat transfer efficiency is high, the refrigerating effect of the air conditioning module is good, and when the liquid in the first cooling circulation loop enters the cooling plate, the temperature of the movable battery can be rapidly reduced. So, can utilize different cooling circuit to cool down to the high temperature of difference, can enough guarantee that the power temperature can not be too high, can guarantee again that the in-process of cooling can not produce the waste of energy. The temperature of the power battery is always kept within a certain temperature range, and the efficiency of the power battery can be greatly improved.
Preferably, the first pipeline, the second pipeline and the radiator are all communicated with the water pump through electromagnetic valves. Further, the first pipeline, the second pipeline and the radiator are communicated with an outlet of the water pump through a four-way valve; the four-way valve is provided with a water inlet, a first water outlet, a second water outlet and a third water outlet; the water inlet is communicated with the outlet of the water pump; the first water outlet is communicated with the first pipeline, the second water outlet is communicated with the second pipeline, and the third water outlet is communicated with the radiator. In this way, the working states of the heating circulation circuit, the first cooling circulation circuit and the second cooling circulation circuit can be simultaneously controlled by one four-way valve, namely, one circulation circuit is controlled to work by the four-way valve according to different conditions, and the other two circulation circuits do not work. So that the switching between the different loops is controlled. The four-way valve is characterized by further comprising a water supply kettle, wherein the water supply kettle is communicated with a pipeline which is used for connecting the radiator and the four-way valve. Therefore, the liquid in the system can be ensured to be sufficient, and the control effect of the temperature of the power battery is ensured. In specific implementation, the liquid in the system may be water or a mixture of water and other substances.
In specific implementation, the heater may also be disposed on the first pipeline, so that when the first cooling circulation loop and the second cooling circulation loop work, the liquid in the system does not need to pass through the heater.
As a preferable mode, the air conditioning module further includes a compressor, a condenser, a dryer, a first solenoid valve, and a first expansion valve; the compressor, the condenser, the dryer, the first electromagnetic valve, the first expansion valve and the liquid-liquid heat exchanger are sequentially connected end to form an air-conditioning refrigeration loop. So, through air conditioning module, can directly utilize air conditioning module's refrigeration effect to cool down power battery, be favorable to improving cooling speed, guarantee that power battery reaches suitable operating temperature fast.
As a preferable mode, the power battery comprises a plurality of battery cells which are closely arranged and an integrated shell; the battery monomer with the cooling plate all sets up in the integration casing. Thus, the heat transfer efficiency between the cooling plate and the battery cell can be ensured.
Example 2
Referring to fig. 2 to 4, fig. 2 is a flowchart illustrating steps of a method according to the present invention; FIG. 3 is a flowchart illustrating a specific step of step S3 according to the present invention; FIG. 4 is a flowchart illustrating a specific step of step S4 according to the present invention; the invention also provides a method for the power battery temperature control system provided by the embodiment of the invention, wherein the method comprises the following steps:
s1, collecting temperature values and environmental temperature values of a plurality of positions on the power battery; calculating a maximum temperature value and a minimum temperature value in the acquired temperature values of the power battery; specifically, temperature sensors are arranged at all positions on the battery and outside the vehicle, the temperature and the environment temperature value of all positions of the power battery are collected through the temperature sensors, and the maximum temperature value and the minimum temperature value are obtained by comparing the temperature values of all positions of the power battery; s2, judging whether the environmental temperature value is less than a preset environmental temperature value; if yes, go to step S3; if not, go to step S4; in particular, said preset ambient temperature value is comprised between 7 ℃ and 30 ℃, preferably 15 ℃. S3, judging whether the minimum temperature value is less than a first preset battery temperature value; if yes, controlling the heating circulation loop to work; in particular, the first preset battery temperature value is comprised between 6 ℃ and 8 ℃, preferably 7 ℃. More specifically, the step S3 specifically includes the following steps: s301, judging whether the minimum temperature value is smaller than a first preset battery temperature value and larger than or equal to a third preset battery temperature value or not, and if so, controlling the heater to work at 50% of the maximum power; specifically, the third preset battery temperature value is preferably 3 ℃. Namely, when the minimum temperature value is between 3 ℃ and 7 ℃, the heater is controlled to work at 50% of the maximum power, and the maximum power refers to the maximum rated power. S302, judging whether the minimum temperature value is less than a third preset battery temperature value and greater than or equal to a fourth preset battery temperature value or not, and if so, controlling the heater to work at 60% of the maximum power; specifically, the fourth preset battery temperature value is preferably 0 ℃, that is, when the minimum temperature value is between 0 ℃ and 3 ℃, the heater is controlled to operate at 60% of the maximum power, and the water pump is controlled to operate at the same time. S303, judging whether the minimum temperature value is less than a fourth preset battery temperature value, if so, controlling the heater to work at the maximum power, and controlling the water pump to run at 60% of the maximum rotation speed; if not, go to step S304; at this time, the power battery is at a more appropriate temperature. And S304, controlling the heater to stop working, and controlling the water pump to stop working. S4, judging whether the maximum temperature value is less than a second preset battery temperature value; and if not, controlling the first cooling circulation loop or the second cooling circulation loop to work. Further, the step S4 specifically includes a step S401 of determining whether the maximum temperature value is less than the second preset battery temperature value, and if so, entering step S1; s402, judging whether the maximum temperature value is smaller than a fifth preset battery temperature value or not, if so, controlling the second cooling circulation loop to work, controlling the water pump to work at a first rotating speed, and controlling a fan on the radiator to work; specifically, the second preset temperature value is preferably 30 ℃, the fifth preset battery temperature value is preferably 35 ℃, that is, when the maximum temperature value is between 30 ℃ and 35 ℃, the second cooling circulation loop is controlled to circulate, the water pump is controlled to operate at a first rotation speed, the first rotation speed is preferably 1500rpm, and the fan on the radiator is controlled to operate. S403, judging whether the maximum temperature value is smaller than a sixth preset battery temperature value, if so, controlling the second cooling circulation loop to work, and controlling the water pump to work at a second rotating speed; if not, go to step S404; specifically, the sixth preset battery temperature value is preferably 40 ℃, that is, when the maximum temperature value is between 35 ℃ and 40 ℃, the second cooling circulation loop is controlled to circulate, and the water pump is controlled to operate at a second rotation speed, wherein the second rotation speed is preferably 3000 rpm. S404, controlling the first cooling circulation loop to work, controlling the air conditioning module to work, and controlling the water pump to work at a second rotating speed;
example 3
Referring to fig. 5, fig. 5 is a flowchart illustrating steps of embodiment 3 according to the present invention. The method comprises the following steps: s1, collecting temperature values and environmental temperature values of a plurality of positions on the power battery; calculating a maximum temperature value and a minimum temperature value in the acquired temperature values of the power battery; s2, judging whether the environmental temperature value is less than the preset environmental temperature value; if yes, go to step S3; if not, go to step S4; s3, judging whether the minimum temperature value is less than a first preset battery temperature value; if yes, controlling the heating circulation loop to work; s4, judging whether the maximum temperature value is less than a second preset battery temperature value; and if not, controlling the first cooling circulation loop or the second cooling circulation loop to work. In this embodiment, the first preset battery temperature value and the second preset battery temperature value may be the same as the selected values in embodiment 2.
In this embodiment, the method further includes the following steps: s5, judging whether the maximum temperature value is less than the preset emergency temperature value; if yes, go to step S1; if not, go to step S6; in particular, the preset emergency temperature value is preferably 60 ℃. And S6, controlling the second cooling circulation loop and the air conditioning module to work, specifically controlling the compressor to work, and controlling the water pump to work at the highest rotating speed. Therefore, the power battery can be quickly cooled under the condition that the temperature of the power battery is quickly increased due to abnormal conditions.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (7)

1. A power cell temperature control system, comprising:
the temperature control unit is formed by sequentially communicating a liquid-gas separator, a heater, a cooling plate and a water pump; the cooling plate is tightly attached to the power battery;
the first pipeline and the pipelines in the temperature control unit and the temperature control unit form a heating circulation loop together;
the second pipeline and the pipelines in the temperature control unit and the temperature control unit form a first cooling circulation loop together;
the air conditioning module at least comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger is connected in series with the second pipeline; and
the radiator and the pipelines in the temperature control unit form a second cooling circulation loop together;
the second cooling circulation loop is arranged in the first cooling circulation loop;
the control system comprises the following steps:
s1, collecting temperature values of set positions on the power battery and environmental temperature values; calculating a maximum temperature value and a minimum temperature value in the acquired temperature values of the power battery;
s2, judging whether the environmental temperature value is less than the preset environmental temperature value; if yes, go to step S3; if not, go to step S4;
s3, judging whether the minimum temperature value is less than a first preset battery temperature value; if yes, controlling the heating circulation loop to work;
s4, judging whether the maximum temperature value is less than a second preset battery temperature value; if not, controlling the first cooling circulation loop or the second cooling circulation loop to work;
the step S3 specifically includes the following steps:
s301, judging whether the minimum temperature value is smaller than a first preset battery temperature value and larger than or equal to a third preset battery temperature value or not, and if so, controlling the heater to work at 50% of the maximum power;
s302, judging whether the minimum temperature value is less than a third preset battery temperature value and greater than or equal to a fourth preset battery temperature value or not, and if so, controlling the heater to work at 60% of the maximum power;
s303, judging whether the minimum temperature value is less than a fourth preset battery temperature value, if so, controlling the heater to work at the maximum power, and controlling the water pump to run at 60% of the maximum rotation speed; if not, go to step S304;
and S304, controlling the heater to stop working and controlling the water pump to stop working.
2. The power battery temperature control system of claim 1, wherein the first pipeline, the second pipeline and the radiator are all in communication with the water pump through solenoid valves.
3. The power battery temperature control system of claim 2, wherein the first pipeline, the second pipeline and the radiator are communicated with an outlet of the water pump through the same four-way valve;
the four-way valve is provided with a water inlet, a first water outlet, a second water outlet and a third water outlet; the water inlet is communicated with the outlet of the water pump; the first water outlet is communicated with the first pipeline, the second water outlet is communicated with the second pipeline, and the third water outlet is communicated with the radiator.
4. The power battery temperature control system of claim 1, wherein the air conditioning module further comprises a compressor, a condenser, a dryer, a first solenoid valve, and a first expansion valve;
the compressor, the condenser, the dryer, the first electromagnetic valve, the first expansion valve and the liquid-liquid heat exchanger are sequentially connected end to form an air-conditioning refrigeration loop.
5. The power battery temperature control system of claim 1, wherein the power battery comprises a plurality of closely packed battery cells and an integrated housing;
the battery monomer with the cooling plate all sets up in the integration casing.
6. The power battery temperature control system according to claim 5, wherein the step of S4 specifically comprises the following steps:
s401, judging whether the maximum temperature value is smaller than the second preset battery temperature value or not, and if so, entering a step S1;
s402, judging whether the maximum temperature value is smaller than a fifth preset battery temperature value or not, if so, controlling a second cooling circulation loop to work, controlling a water pump to work at a first rotating speed, and controlling a fan on a radiator to work;
s403, judging whether the maximum temperature value is smaller than a sixth preset battery temperature value, if so, controlling a second cooling circulation loop to work, and controlling a water pump to work at a second rotating speed; if not, go to step S404;
and S404, controlling the first cooling circulation loop to work, controlling the air conditioning module to work, and controlling the water pump to work at a second rotating speed.
7. The power battery temperature control system of claim 6, further comprising the steps of:
s5, judging whether the maximum temperature value is less than the preset emergency temperature value; if yes, go to step S1; if not, go to step S6;
and S6, controlling the second cooling circulation loop and the air conditioning module to work, and controlling the water pump to work at the highest rotating speed.
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