CN115000541A - Thermal management system and method for energy storage container - Google Patents
Thermal management system and method for energy storage container Download PDFInfo
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- CN115000541A CN115000541A CN202210749002.5A CN202210749002A CN115000541A CN 115000541 A CN115000541 A CN 115000541A CN 202210749002 A CN202210749002 A CN 202210749002A CN 115000541 A CN115000541 A CN 115000541A
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H01M10/63—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
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
The invention relates to a thermal management system and method for an energy storage container, and belongs to the field of energy storage battery containers. The system comprises a cooling water loop and a refrigerant loop, wherein the refrigerant loop comprises a compressor, a fluorine pump, a four-way valve, a condenser, an expansion valve, a second stop valve, a battery cooler, a first stop valve, an evaporator, an electronic fan, a gas-liquid separator, a third stop valve and a fourth stop valve, and pipelines of the refrigerant loop are connected with all parts. The cooling water loop comprises a water pump, a three-way valve with two branches of an energy storage battery pack, a high-pressure PTC and a low-temperature radiator. The invention can efficiently and accurately manage the temperature of the battery of the energy storage container, meet the requirements of economy and environmental protection, simultaneously expand the use scenes of the energy storage container and prolong the service life.
Description
Technical Field
The invention belongs to the field of energy storage battery containers, and relates to a thermal management system and method of an energy storage container.
Background
In recent years, energy storage power stations have been promoted to develop opportunities due to various factors such as domestic green environmental protection requirements, implementation of peak-valley electricity price policies, new energy power generation rise, and requirements of productive enterprises for stable power utilization. However, in battery energy storage power stations, especially in battery energy storage containers, such as devices with high energy density and closed structures, due to the characteristics of high heat dissipation capacity, full-season operation and the like, accurate management of the battery pack temperature and long-term stable operation of an air conditioning system are required, and meanwhile, the air conditioning system needs to be as economical and energy-saving as possible in operation, which provides a new challenge for the air conditioning system of the battery energy storage container.
Each module laminating of energy storage battery is inseparable in the energy storage container, container inner space is narrow and small, simultaneously because of its energy density is big, factor of safety requires highly, need carry out accurate management to the heat that gives off in battery charge-discharge and the storage process, avoids too big because of battery temperature variation, leads to the internal resistance of battery to increase the life who harms the battery and then influence energy storage equipment, can arouse even when serious that battery thermal unbalance leads to spontaneous combustion, explosion to take place. In cold weather places, the battery capacity is reduced due to the increase in the flow resistance of positive and negative ions because the activity of the internal substances of the battery in the energy storage container is reduced due to the low-temperature environment. At the moment, the battery needs to be subjected to heating and heat preservation treatment, so that the condition that the function of the energy storage container is weakened or invalid due to the fact that the power failure at low temperature exceeds the standard in the electric quantity storage process is avoided; or in the early charging and discharging stage of the energy storage battery, the activity of ions in the battery is reduced due to low temperature, so that the charging and discharging efficiency does not meet the requirement of quick charging and quick discharging. Therefore, in cold weather, it becomes very important to heat up, preserve heat and insulate the energy storage battery. At present, the environment protection, energy conservation and emission reduction are advocated, and how to make the heat management of the energy storage container more economic and environment-friendly and prolong the service life of the energy storage container is very important.
The existing energy storage container mainly has two modes of air cooling and liquid cooling for heat management. The air duct and the air distribution device occupying a large space in the air-cooled heat management method can extrude the storage space of the battery in the container to reduce the capacity of the battery, and the air-cooled heat management method is high in energy consumption, low in energy efficiency, high in difficulty in accurate management of the temperature of the battery and high in development difficulty. The existing liquid cooling system has the defects of single function, low COP energy efficiency and poor economic and environmental protection performance.
Disclosure of Invention
In view of this, the present invention provides a thermal management system and a method for an energy storage container, which perform efficient and accurate management on the temperature of a battery of the energy storage container, meet the requirements of economy and environmental protection, and simultaneously expand the use scenarios of the energy storage container and prolong the service life.
In order to achieve the purpose, the invention provides the following technical scheme:
a thermal management system for an energy storage container, comprising;
the first loop comprises an energy storage battery pack, a three-way valve, a low-temperature radiator and a water pump which are sequentially arranged, and the first loop is connected to the energy storage battery pack in a return mode; the three-way valve is connected with a first branch which is connected with the low-temperature radiator in parallel; the first branch comprises a battery cooler and a PTC along the direction far away from the three-way valve;
the second loop is communicated to the battery cooler and sequentially comprises an evaporator, a first stop valve and a second stop valve; the second loop is connected with a second branch which sequentially comprises a four-way valve, a condenser and an expansion valve, and the second branch is connected with the evaporator and the first cut-off valve in parallel;
the third loop is communicated with the four-way valve and sequentially comprises a gas-liquid separator, a third stop valve and a fluorine pump; the third loop is connected with a third branch which sequentially comprises a fourth stop valve and a compressor;
the first loop is a cooling water loop, and the second loop and the third loop are refrigerant loops.
Optionally, the low-temperature radiator, the condenser, the evaporator and the electronic fan are sealed by the air duct and the controllable air doors, and the functions of air suction or air blowing inside or outside the container are realized by controlling the operation and combination of different air doors.
A heat management method of an energy storage container provides a heat management system of the energy storage container and provides a first refrigeration mode, and low-temperature cooling water enters an energy storage battery pack through a water pump; the heated antifreeze enters the low-temperature radiator through a three-way valve, and the low-temperature radiator discharges the antifreeze after convection with air through the operation of an electronic fan and then circularly enters a water pump.
Optionally, a second refrigeration mode is provided, in the second refrigeration mode, on the basis of the opening of the first refrigeration mode, a refrigerant is pumped into the four-way valve by the fluorine pump to enter the condenser to form medium-temperature high-pressure liquid, the medium circularly enters the expansion valve to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler forms low-temperature low-pressure gas through heat exchange, and the low-temperature low-pressure gas enters the gas-liquid separator through the four-way valve and then circularly enters the fluorine pump through the opened third stop valve; and high-temperature antifreeze liquid flowing out of the energy storage battery pack enters a battery cooler through a tee joint to be cooled into low-temperature antifreeze liquid, and circularly flows into the non-working PTC and then circularly enters the energy storage battery pack through a water pump to cool the battery pack.
Optionally, a third refrigeration mode is provided, in the third refrigeration mode, on the basis of starting the first refrigeration mode and the second refrigeration mode, low-temperature cooling water is pumped into the energy storage battery pack by a water pump, the heated antifreeze solution enters the low-temperature radiator and the battery cooler through the three-way valve at the same time for cooling, and the cooled antifreeze solution is collected and circulated into the water pump; the refrigerant is pumped into the four-way valve by the running fluorine pump, enters the condenser for heat convection and cooling with wind, then enters the expansion valve for expansion to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler forms low-temperature low-pressure gas through heat exchange, enters the gas-liquid separator through the four-way valve, and then circularly enters the fluorine pump through the opened third stop valve.
Optionally, a fourth refrigeration mode is provided, in the fourth refrigeration mode, on the basis of starting the first refrigeration mode, the second refrigeration mode and the third refrigeration mode, the high-temperature antifreeze solution which flows out of the energy storage battery pack and absorbs heat is adjusted by the three-way valve to enter the battery cooler to be cooled into the low-temperature antifreeze solution, and after circularly flowing into the non-working PTC, the antifreeze solution circularly enters the energy storage battery pack by the water pump to cool the battery pack; the refrigerant is pressurized by the compressor to form high-temperature high-pressure liquid, then enters the expansion valve to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler absorbs heat to form low-temperature low-pressure gas, then enters the gas-liquid separator through the four-way valve, and the refrigerant entering the gas-liquid separator circularly enters the compressor through the opened fourth stop valve.
Optionally, a first heating mode is provided, wherein the refrigerant is pressurized by the compressor to form a high-temperature high-pressure gaseous refrigerant, circularly enters the four-way valve, enters the battery cooler to be cooled to form medium-temperature high-pressure liquid, and then enters the expansion valve to form low-temperature low-pressure liquid; the gas enters a condenser, forms low-temperature and low-pressure gas through air convection heat release, enters a gas-liquid separator through a four-way valve, and is circularly sucked into a compressor through a fourth cut-off valve which is opened; the low-temperature antifreeze fluid flowing into the battery cooler absorbs the heat of the refrigerant to form high-temperature antifreeze fluid, the high-temperature antifreeze fluid is pumped into the energy storage battery pack after being pressurized by the inactivated PTC inflow water pump, and the antifreeze fluid after releasing heat circulates and flows into the battery cooler through the three-way valve to form circulation.
Optionally, a second heating mode is provided, which activates the PTC based on the first heating mode being turned on.
Optionally, a dehumidification mode is provided, the refrigerant is pressurized by the compressor to form a high-temperature and high-pressure refrigerant, then enters the condenser through the four-way valve to form medium-temperature and high-pressure liquid, is expanded by the expansion valve to form low-temperature and low-pressure gas, and enters the evaporator through the first stop valve to absorb heat to form low-temperature and low-pressure gas, and then enters the gas-liquid separator through the four-way valve, and then circularly enters the compressor through the opened fourth stop valve to form refrigerant circulation.
Optionally, when the dehumidification mode is turned on, the humid air in the container is pressurized by the fan, and then returns to the inside of the container through the evaporator and the condenser, and the moisture separated from the air after passing through the evaporator is discharged to the outside of the container through the pipeline.
The invention has the beneficial effects that:
the invention develops a novel liquid-cooled energy storage container battery thermal management system under the conditions of different environmental temperatures and different battery pack heat dissipation requirements of energy storage batteries. The system adopts different modes to carry out accurate heat management, meets the temperature management requirement of the battery with the lowest energy consumption, and simultaneously improves the reliability of the heat management system. The system has the advantages that the system is designed for different heat dissipation grade conditions of the battery pack in the energy storage container and various heat dissipation scenes, the main functions of battery heat dissipation are considered in the modes, the energy consumption is low, the COP value is high, the frequency of starting and stopping the refrigerant loop is reduced, and the system operation reliability is improved.
The invention expands the application environment of the energy storage container, meets the requirements of heat preservation and temperature rise under different working conditions of the battery pack in the energy storage container by adopting two combined scenes of the heat pump system of the economical and energy-saving air conditioning system and the PTC heating unit under the low-temperature environment, reduces the influence of the low-temperature environment on the battery capacity, and avoids the function weakening or the failure of efficient charging of the energy storage container caused by the battery power failure caused by low-temperature factors. Under the condition that the battery pack of the energy storage container needs to be insulated and heated, the heat pump working mode of the air conditioning system is fully utilized to reduce energy consumption, so that low-carbon economy and environmental protection are realized. In consideration of the possible insufficient heating capacity, the water cooling system is connected with a high-voltage PTC with adjustable power in series to meet the requirements of different levels of heating capacity. Through the combined mode, the effects of rapid temperature rise of the battery pack in the early stage and low energy consumption and continuous heat preservation in the heat pump mode in the later stage can be achieved, and the optimal balance is achieved between economy and functionality.
When the humidity in the energy storage container is high, the air-conditioning refrigeration dehumidification mode is used, so that the adverse effect of wet air on an electronic circuit in the energy storage container is reduced, the service life of an electric element of the energy storage container is prolonged, and the stability and the reliability of the energy storage container in the operation process are enhanced. Under the environment of high humidity, moisture in the air is extremely easy to accelerate the internal corrosion of equipment facilities of the energy storage container, so that the service life of the energy storage container is shortened; and secondly, the electric devices in the energy storage container are easy to cause faults such as short circuit, spark, unstable operation and the like due to high-humidity air, so that the reliability of the system is reduced. Can carry out dehumidification processing through dehumidification mode to inside air this moment, complete inner loop can be accomplished through control air door to this kind of mode, does not trade wind or dispel the heat outward, guarantees the stability of the inside air temperature of energy storage container and humidity.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the first cooling mode operation;
FIG. 3 is a schematic view of a second cooling mode of operation;
FIG. 4 is a schematic view of a third cooling mode of operation;
FIG. 5 is a schematic view of a fourth cooling mode of operation;
FIG. 6 is a schematic view of the first heating mode;
FIG. 7 is a schematic view of the second heating mode;
fig. 8 is a schematic diagram of the dehumidification mode operation.
Reference numerals: the system comprises a compressor 1, a four-way valve 2, a condenser 3, an expansion valve 4, a first stop valve 5, an evaporator 6, a second stop valve 7, a battery cooler 8, a fan 9, a gas-liquid separator 10, a third stop valve 11, a fourth stop valve 12, a fluorine pump 13, a PTC14, a water pump 15, an energy storage battery pack 16, a three-way valve 17 and a low-temperature radiator 18.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and the specific meaning of the terms described above will be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 8, a heat management system for an energy storage container is shown, in which a refrigerant circuit includes a compressor 1, a fluorine pump 13, a four-way valve 2, a condenser 3, an expansion valve 4, a second stop valve 7, a battery cooler 8, a first stop valve 5, an evaporator 6, an electronic fan 9, a gas-liquid separator 10, a third stop valve 11, and a fourth stop valve 12, and pipelines of the refrigerant circuit are connected to each component. The cooling water circuit components are a water pump 15, an energy storage battery pack 16, a flow-adjustable three-way valve 17 with two branches 171 and 172, a high-pressure PTC14 and a low-temperature radiator 18, and a plurality of cooling water circuit pipelines are connected with the components. The coolant loop and the cooling water loop are associated by the battery cooler 8 for heat transfer and thermal management. The low-temperature radiator 18, the condenser 3, the evaporator 6 and the electronic fan 9 are sealed by an air duct and controllable air doors, and the functions of air suction or air blowing inside or outside the container can be realized by controlling the operation and combination of different air doors. The system uses environment-friendly safe refrigerants such as R134a, R410A, R22 and the like. The whole system can be integrated into a heat management cabinet with a compact structure which can be embedded in an energy storage container, the output interface of the container is only an inlet and outlet pipe of a water path and a control panel with control and display functions, and the external environment is mainly a window for exchanging air and heat with a heat exchanger.
In the charging, discharging and electric power storage heat preservation processes when the energy storage container is connected with a power grid, different heat dissipation or heat preservation requirements are met for batteries, and the operation working conditions of the heat management system of the energy storage container are complex due to the difference of environmental temperatures.
And in the first refrigeration mode, when the temperature of the external environment is lower than the temperature range required by the work of the battery and the temperature difference meet certain conditions, the refrigerant loop is closed, and the low-energy-consumption cooling water loop is opened. As shown in fig. 2, the operation logic of the cooling water loop is that low-temperature cooling water is pumped into the energy storage battery 16 by the water pump 15, the antifreeze solution after absorbing the heat of the energy storage battery pack enters the low-temperature radiator 18 by the branch 171 of the three-way valve 17, and the radiator discharges the low-temperature antifreeze solution after running through the electronic fan 9 and convecting with air, and then circulates into the water pump 15; the working mode reduces the working energy consumption of the refrigerant loop, is environment-friendly and energy-saving, and prolongs the service life of the refrigerant system.
And in the second refrigeration mode, when the external environment temperature is close to the temperature range required by the battery work and the temperature difference meets a certain condition, the refrigeration mode 1 is started, the water flow or the air quantity is simply increased, the heat dissipation effect of the low-temperature radiator is not ideal, and the refrigerant fluorine pump refrigeration mode is required to be started at the moment. In this case, the refrigerant in the refrigerant loop is pumped into the four-way valve 2 by the running fluorine pump 13, is regulated to enter the condenser 3 to form a medium-temperature high-pressure liquid, is circulated to enter the expansion valve to expand to form a low-temperature low-pressure liquid, the refrigerant entering the battery cooler 8 is subjected to heat exchange to form a low-temperature low-pressure gas, is regulated by the four-way valve 2 to enter the gas-liquid separator 10, and the refrigerant entering the gas-liquid separator is circulated to enter the fluorine pump 13 by the opened third stop valve 11. In the water circuit, the high-temperature antifreeze solution flowing out of the energy storage battery module 16 is adjusted by the three-way valve 17 to enter the battery cooler 8 to be cooled into low-temperature antifreeze solution, and then circularly flows into the PTC14 in the non-operating state, and then circularly enters the energy storage battery pack 16 by the water pump to cool the battery pack, as shown in detail in fig. 3. The mode has obvious energy-saving effect compared with the running working condition of the electric compressor with low rotating speed, avoids frequently starting and stopping the compressor, and prolongs the service life of the compressor.
And in the third refrigeration mode, when the external environment temperature is lower than the temperature range required by the work of the battery and the temperature difference meets a certain condition, the first refrigeration mode and the second refrigeration mode, namely the low-temperature heat dissipation cycle and the fluorine pump refrigeration cycle, are started simultaneously. The operation logic of the cooling water loop is that low-temperature cooling water is pumped into the energy storage battery module 16 by the water pump 15, the antifreeze heated by absorbed heat enters the low-temperature radiator 18 and the battery cooler 8 for cooling by the three-way valve 17, and the cooled low-temperature antifreeze is collected and circulated into the water pump 15. The refrigerant loop operation line is that the refrigerant is pumped into the four-way valve 2 by the operating fluorine pump 13, is regulated to enter the condenser 3 for heat convection and cooling with wind, then circularly enters the expansion valve 4 for expansion to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler 8 is subjected to heat exchange to form low-temperature low-pressure gas, the low-temperature low-pressure gas is regulated by the four-way valve 2 to enter the gas-liquid separator 10, and the refrigerant entering the gas-liquid separator 10 is circulated into the fluorine pump 13 through the opened third stop valve 11, as shown in detail in fig. 4.
And the fourth refrigeration mode is used for starting the refrigeration cycle when the external environment temperature is higher and the refrigeration capacity demand of the battery module cannot be met by starting the third refrigeration mode. In the water loop circulating system, the antifreeze solution flowing out of the energy storage battery pack 16 and absorbing heat to raise the temperature is adjusted by the three-way valve 17 to enter the battery cooler 8 to be cooled into low-temperature antifreeze solution, and flows into the high-pressure PTC14 which is not started in a circulating mode, and then flows into the energy storage battery pack 16 by the water pump 15 in a circulating mode to start cooling the energy storage battery pack 16. The refrigerant in the refrigerant loop is pressurized by the running electric compressor 1 to form a high-temperature and high-pressure refrigerant, then circularly enters the four-way valve 2 to be regulated and enters the condenser 3 to form medium-temperature and high-pressure liquid, then enters the expansion valve 4 to be expanded to form low-temperature and low-pressure liquid, the refrigerant entering the battery cooler 8 absorbs heat to form low-temperature and low-pressure gas, the gas enters the gas-liquid separator 10 through the four-way valve 2 to be regulated, and the refrigerant entering the gas-liquid separator 10 is circularly enters the electric compressor 1 through the opened stop valve 12 as shown in detail in fig. 5.
In the first heating mode, when the battery pack in the energy storage container needs to be heated to keep a reasonable working temperature range, the four-way valve 2 loop is adjusted, and the refrigerant loop heat pump working condition mode is started. The operation principle diagram is shown in fig. 6. The refrigerant loop operation flow is that the refrigerant is pressurized by the running electric compressor 1 to form a high-temperature high-pressure gaseous refrigerant, then circularly enters the four-way valve 2 to be regulated, enters the battery cooler 8 to be cooled to form medium-temperature high-pressure liquid, then enters the expansion valve 4 to form low-temperature low-pressure liquid, enters the condenser 3 to form low-temperature low-pressure gas through air convection heat absorption, circularly enters the gas-liquid separator 10 through the four-way valve 2 to be regulated, and the refrigerant entering the gas-liquid separator 10 is circularly sucked into the electric compressor 1 through the opened stop valve 12. In the water loop circulation, the antifreeze solution flowing into the battery cooler 8 at a low temperature absorbs heat removed by the refrigerant to form high-temperature antifreeze solution, the antifreeze solution flows into the water pump 15 through the high-pressure PTC14 which is not started to be pressurized and then is pumped into the energy storage battery pack 16, and the antifreeze solution after heat release circulates through the three-way valve 17 and is regulated to flow into the battery cooler 8 again through the branch 172 to form complete circulation.
A second heating mode, where the high voltage PTC14 is enabled during the first heating mode cycle when the ambient temperature is low while the energy storage container battery pack requires more heat to ensure a reasonable temperature range for the battery. The high-voltage PTC14 can adjust the heating power according to the battery heat preservation and temperature rise requirement level, and meets different requirements of rapid temperature rise and heat preservation, and the operation principle diagram is shown in figure 7.
The high-efficient dehumidification mode, when the air humidity is great, because of the harsh operational environment demand of many electrical components inside the energy storage container, need to handle the air dehumidification. When the control system detects the input signal, the dehumidification mode of the refrigerant circuit is started. The operation principle diagram is shown in fig. 8, the refrigerant is pressurized by the started electric compressor 1 to form a high-temperature and high-pressure refrigerant, then the refrigerant circularly enters the four-way valve 2 to be regulated and enters the condenser 3 to form medium-temperature and high-pressure liquid, then enters the expansion valve 4 to be expanded to form low-temperature and low-pressure liquid, the refrigerant entering the evaporator 6 through the first stop valve 5 absorbs heat to form low-temperature and low-pressure gas, the gas is regulated by the four-way valve 2 to enter the gas-liquid separator 10, and the refrigerant entering the gas-liquid separator 10 is circularly entered into the electric compressor 1 through the opened stop valve 12 to form complete refrigerant circulation. Meanwhile, when the system operates, the air in the container is pressurized by the fan, then passes through the evaporator 6 and the condenser 3 in sequence and returns to the interior of the container through the control air door, when the air passes through the evaporator 6, the dew point temperature is reduced due to the reduction of the temperature of the air, and moisture separated out from the air passing through the evaporator 6 is discharged to the exterior of the container through the pipeline. The system is repeatedly operated until the internal air humidity meets a certain criterion and then the mode is closed.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A thermal management system for an energy storage container, comprising;
the first circuit comprises an energy storage battery pack (16), a three-way valve (17), a low-temperature radiator (18) and a water pump (15) which are arranged in sequence and connected back to the energy storage battery pack; the three-way valve (17) is connected with a first branch which is connected with a low-temperature radiator (18) in parallel; the first branch comprises a battery cooler (8) and a PTC (14) in a direction away from the three-way valve;
a second circuit which is communicated with the battery cooler and sequentially comprises an evaporator (6), a first stop valve (5) and a second stop valve (7); the second loop is connected with a second branch which sequentially comprises a four-way valve (2), a condenser (3) and an expansion valve (4), and the second branch is connected with the evaporator and the first cut-off valve in parallel;
the third loop is communicated with the four-way valve and sequentially comprises a gas-liquid separator (10), a third stop valve (11) and a fluorine pump (13); the third loop is connected with a third branch which sequentially comprises a fourth stop valve (12) and a compressor (1);
the first loop is a cooling water loop, and the second loop and the third loop are refrigerant loops.
2. The thermal management system of the energy storage container of claim 1, wherein: the low-temperature radiator, the condenser, the evaporator and the electronic fan are sealed by the air duct and the controllable air doors, and the functions of air suction or air blowing inside or outside the container are realized by controlling the operation and combination of different air doors.
3. A method of thermal management of an energy storage container, characterized by: providing a thermal management system for an energy storage container as claimed in claim 1 or claim 2 and providing a first cooling mode, wherein low-temperature cooling water is pumped into the energy storage battery pack by a water pump; the heated antifreeze enters the low-temperature radiator through a three-way valve, and the low-temperature radiator discharges the antifreeze after convection with air through the operation of an electronic fan and then circularly enters a water pump.
4. A method of thermal management of an energy storage container as claimed in claim 3, wherein: providing a second refrigeration mode, wherein in the second refrigeration mode, on the basis of the starting of the first refrigeration mode, a refrigerant is pumped into the four-way valve by the fluorine pump to enter the condenser to form medium-temperature high-pressure liquid, the medium circularly enters the expansion valve to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler forms low-temperature low-pressure gas through heat exchange, and the low-temperature low-pressure gas enters the gas-liquid separator through the four-way valve and then circularly enters the fluorine pump through the opened third stop valve; and high-temperature antifreeze liquid flowing out of the energy storage battery pack enters a battery cooler through a tee joint to be cooled into low-temperature antifreeze liquid, and circularly flows into the non-working PTC and then circularly enters the energy storage battery pack through a water pump to cool the battery pack.
5. The method of thermal management of an energy storage container of claim 4, wherein: providing a third refrigeration mode, wherein in the third refrigeration mode, on the basis of starting the first refrigeration mode and the second refrigeration mode, low-temperature cooling water is pumped into the energy storage battery pack by a water pump, the heated antifreeze enters the low-temperature radiator and the battery cooler through the three-way valve at the same time for cooling, and the cooled low-temperature antifreeze is collected and circulated into the water pump; the refrigerant is pumped into the four-way valve by the running fluorine pump, enters the condenser for heat convection and cooling with wind, then enters the expansion valve for expansion to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler forms low-temperature low-pressure gas through heat exchange, enters the gas-liquid separator through the four-way valve, and then circularly enters the fluorine pump through the opened third stop valve.
6. The method of thermal management of an energy storage container of claim 5, wherein: providing a fourth refrigeration mode, wherein in the fourth refrigeration mode, on the basis of starting the first refrigeration mode, the second refrigeration mode and the third refrigeration mode, the high-temperature antifreezing solution which flows out of the energy storage battery pack and absorbs heat is regulated by a three-way valve to enter a battery cooler to be cooled into low-temperature antifreezing solution, and the low-temperature antifreezing solution circularly flows into the non-working PTC and then circularly enters the energy storage battery pack by a water pump to cool the battery pack; the refrigerant is pressurized by the compressor to form high-temperature high-pressure liquid, then enters the expansion valve to form low-temperature low-pressure liquid, the refrigerant entering the battery cooler absorbs heat to form low-temperature low-pressure gas, then enters the gas-liquid separator through the four-way valve, and the refrigerant entering the gas-liquid separator circularly enters the compressor through the opened fourth stop valve.
7. The method of thermal management of an energy storage container of claim 3, wherein: providing a first heating mode, wherein a refrigerant is pressurized by a compressor to form a high-temperature high-pressure gaseous refrigerant, circularly enters a four-way valve, enters a battery cooler to be cooled to form medium-temperature high-pressure liquid, and then enters an expansion valve to form low-temperature low-pressure liquid; the gas enters a condenser, then is subjected to heat convection through air to form low-temperature and low-pressure gas, enters a gas-liquid separator through a four-way valve, and is circularly sucked into a compressor through a fourth cut-off valve which is opened; the low-temperature antifreeze liquid flowing into the battery cooler absorbs heat of the refrigerant to form high-temperature antifreeze liquid, the high-temperature antifreeze liquid flows into the water pump through the started PTC, is pressurized and then is pumped into the energy storage battery pack, and the antifreeze liquid after heat release circulates through the three-way valve and flows into the battery cooler to form circulation.
8. The method of thermal management of an energy storage container of claim 7, wherein: a second heating mode is provided, which enables the PTC on the basis of the activation of the first heating mode.
9. The method of thermal management of an energy storage container of claim 3, wherein: and providing a dehumidification mode, wherein the refrigerant is pressurized by the compressor to form a high-temperature and high-pressure refrigerant, then enters the condenser through the four-way valve to form medium-temperature and high-pressure liquid, is expanded by the expansion valve to form low-temperature and low-pressure gas, and then enters the evaporator through the first stop valve to absorb heat to form low-temperature and low-pressure gas, and then enters the gas-liquid separator through the four-way valve, and finally circularly enters the compressor through the opened fourth stop valve to form refrigerant circulation.
10. The method of thermal management of an energy storage container of claim 9, wherein: when the dehumidification mode is started, air in the container is pressurized by the fan, then returns to the interior of the container after passing through the evaporator and the condenser, and moisture separated out from the air passing through the evaporator is discharged to the exterior of the container through the pipeline.
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| CN202210749002.5A CN115000541A (en) | 2022-06-28 | 2022-06-28 | Thermal management system and method for energy storage container |
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| CN202210749002.5A CN115000541A (en) | 2022-06-28 | 2022-06-28 | Thermal management system and method for energy storage container |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780030A (en) * | 2023-07-28 | 2023-09-19 | 苏州酷吉制冷技术有限公司 | Cooling and heat-preserving integrated system for container energy storage |
| CN116885332A (en) * | 2023-07-07 | 2023-10-13 | 苏州黑盾环境股份有限公司 | Variable-frequency multi-connected energy storage refrigerating system |
| CN117117387A (en) * | 2023-10-19 | 2023-11-24 | 深圳市首航新能源股份有限公司 | Energy storage thermal management system |
| CN117293449A (en) * | 2023-11-27 | 2023-12-26 | 豫新汽车热管理科技有限公司 | Refrigerant direct-cooling and direct-heating type heat management system for energy storage cabinet and flow distribution structure of refrigerant direct-cooling and direct-heating type heat management system |
| CN118248999A (en) * | 2024-05-28 | 2024-06-25 | 常州博瑞电力自动化设备有限公司 | Method and system for thermal management of net-structured energy storage cabinet |
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2022
- 2022-06-28 CN CN202210749002.5A patent/CN115000541A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885332A (en) * | 2023-07-07 | 2023-10-13 | 苏州黑盾环境股份有限公司 | Variable-frequency multi-connected energy storage refrigerating system |
| CN116885332B (en) * | 2023-07-07 | 2024-02-06 | 苏州黑盾环境股份有限公司 | Variable-frequency multi-connected energy storage refrigerating system |
| CN116780030A (en) * | 2023-07-28 | 2023-09-19 | 苏州酷吉制冷技术有限公司 | Cooling and heat-preserving integrated system for container energy storage |
| CN117117387A (en) * | 2023-10-19 | 2023-11-24 | 深圳市首航新能源股份有限公司 | Energy storage thermal management system |
| CN117117387B (en) * | 2023-10-19 | 2024-02-06 | 深圳市首航新能源股份有限公司 | Energy storage thermal management system |
| CN117293449A (en) * | 2023-11-27 | 2023-12-26 | 豫新汽车热管理科技有限公司 | Refrigerant direct-cooling and direct-heating type heat management system for energy storage cabinet and flow distribution structure of refrigerant direct-cooling and direct-heating type heat management system |
| CN118248999A (en) * | 2024-05-28 | 2024-06-25 | 常州博瑞电力自动化设备有限公司 | Method and system for thermal management of net-structured energy storage cabinet |
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