CN116742189A - Multi-system energy storage liquid cooling unit - Google Patents
Multi-system energy storage liquid cooling unit Download PDFInfo
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- CN116742189A CN116742189A CN202310645164.9A CN202310645164A CN116742189A CN 116742189 A CN116742189 A CN 116742189A CN 202310645164 A CN202310645164 A CN 202310645164A CN 116742189 A CN116742189 A CN 116742189A
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- 239000007788 liquid Substances 0.000 title claims abstract description 145
- 238000001816 cooling Methods 0.000 title claims abstract description 114
- 238000004146 energy storage Methods 0.000 title claims abstract description 101
- 238000005057 refrigeration Methods 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003507 refrigerant Substances 0.000 claims description 40
- 238000003860 storage Methods 0.000 claims description 23
- 230000001502 supplementing effect Effects 0.000 claims description 19
- 239000002826 coolant Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 3
- 210000000352 storage cell Anatomy 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 description 20
- 238000000034 method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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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
-
- 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
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
-
- 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
-
- 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
- H01M10/6556—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
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
-
- 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
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a multi-system energy storage liquid cooling unit, which comprises a liquid cooling circulation loop, at least two refrigeration loops and corresponding plate evaporators; the liquid cooling circulation loop and the plurality of refrigeration loops are connected in parallel through the plate type evaporator; one end of the liquid cooling circulation loop is connected to one heat exchange end of the plate-type evaporator, and the other end of the liquid cooling circulation loop is connected to the water cooling plate of the energy storage battery cluster through a liquid cooling piping; one end of the refrigeration loop is respectively connected to other heat exchange ends of the plate-type evaporator, and the other end of the refrigeration loop is respectively connected to the corresponding condenser through soft copper tubes. The multi-system energy storage liquid cooling unit is characterized in that a refrigerating system is configured by at least 1+1, 2 sets of independent refrigerating systems are arranged, and when any refrigerating system fails, the whole liquid cooling system still has 50% refrigerating capacity. Meanwhile, through optimizing the control logic, the constant-temperature operation of the energy storage battery cluster can be ensured, and the reliability and stability of the continuous operation of the energy storage equipment can be greatly improved.
Description
Technical Field
The invention relates to the technical field of energy storage battery liquid cooling of energy storage power stations, in particular to a multi-system energy storage liquid cooling unit.
Background
The energy storage technology can solve the problems of peak regulation, peak-to-valley balance and the like of the power system. In the power generation of new energy sources such as wind power, photoelectricity and the like, the energy storage technology can relieve the intermittent power generation problem and improve the utilization rate of the new energy sources and the stability of power supply. Under the background that the electrochemical energy storage market represented by the lithium ion battery is walking into a development fast lane, the market continuously puts requirements on the service life, safety (battery thermal runaway) and efficiency (battery core temperature consistency) of the lithium ion battery energy storage, and particularly the problem of the thermal runaway of the lithium ion battery is accelerating the rapid development of the cooling technology of the energy storage industry.
At present, the common cooling mode of the energy storage system is mainly a natural cooling or forced air cooling mode, but the heat dissipation power of the energy storage system is limited, and the heat dissipation requirement of a high-capacity and high-power energy storage battery system cannot be met. In the existing air cooling system, heat-exchanged air is emitted to the surrounding environment through a heat exchanger. The long-term operation is surrounded by hot air between the energy storage battery containers, so that a heat island effect is formed, the cooling efficiency of the energy storage battery is reduced, the heat dissipation effect of the energy storage battery is affected, and meanwhile, the requirement of constant-temperature operation of the energy storage battery cluster is difficult to meet due to unstable temperature of cooling medium (air).
In addition, along with the development of energy storage cooling technology, the energy storage liquid cooling technology breaks through, but most of the existing energy storage liquid cooling systems adopt single circulation system and single refrigeration system configuration, when any equipment in the system fails, the whole liquid cooling system cannot work normally, the liquid cooling system loses cooling capacity, long-term safe, reliable and stable operation of energy storage equipment is affected, and meanwhile the service life of an energy storage unit is also not good.
Moreover, to ensure that the heat dissipation needs of the energy storage system are met, a large capacity refrigeration system is configured in excess of the needs, and for general situations (non-maximum heat dissipation needs), starting such a refrigeration system can result in energy waste, while configuring a variable frequency or other form of power-adjustable refrigeration system can result in higher costs of the refrigeration system.
Disclosure of Invention
The invention aims to provide a multi-system energy storage liquid cooling unit, which is used for solving the problems of low reliability, energy waste or higher cost of the existing energy storage liquid cooling system.
In order to achieve the above object, the present invention provides a method comprising:
the technical scheme of the multi-system energy storage liquid cooling unit comprises a liquid cooling circulation loop and at least two refrigeration circulation loops; an energy storage battery cluster water cooling plate for radiating the energy storage power station battery clusters and a heat exchange end of the evaporator are connected in series in the liquid cooling circulation loop; the evaporator also comprises heat exchange ends which are in one-to-one correspondence with the refrigeration cycle loops and are respectively connected in series with the corresponding refrigeration cycle loops to play a role of the evaporator, and the refrigeration cycle loops and the corresponding heat exchange ends form refrigerant circulation.
The invention carries out forced refrigeration on the battery liquid cooling circulation by a plurality of sets of parallel refrigeration loops which share the same evaporator with a plurality of heat exchange ends, and compared with the refrigeration capacity or efficiency (refrigeration power) of a single refrigeration system in the prior art, the equipment selection of the plurality of sets of refrigeration circulation can be reduced by at least more than half, and the cost of a single equipment is reduced.
The refrigeration equipment of the plurality of sets can independently operate respectively, any equipment in any set fails, the heat dissipation operation of the system is not affected, the reliability of the system is improved, and the operation of the single refrigeration equipment under the non-maximum refrigeration requirement avoids the energy waste that the refrigeration power is larger than the heat dissipation requirement when the existing single refrigeration system high-capacity equipment operates.
Further, when the temperature of the energy storage battery cluster is greater than a set threshold value, starting the liquid cooling circulation of the liquid cooling circulation loop; after the set time, if the temperature of the energy storage battery cluster is still greater than the set threshold value, starting the refrigerant circulation of a refrigeration circulation loop; and after the set time, if the temperature of the energy storage battery cluster is still greater than the set threshold value, restarting the refrigerant circulation of the next refrigeration cycle.
The liquid cooling unit comprises a liquid cooling cycle and a plurality of sets of refrigeration cycles, and is started in stages according to different starting criteria when active heat dissipation demands exist, namely, different numbers of devices are correspondingly started according to the heat dissipation demands, so that heat dissipation is more targeted according to the demands, and the energy consumption of heat dissipation is further reduced.
Further, the start-up sequence of the refrigeration cycle is to preferentially start up the refrigeration cycle with a shorter total usage period.
The refrigeration cycle loop is preferentially started according to the length of the history use when the total operation time is selected preferentially, so that the running balance of the total refrigeration equipment is ensured, the service lives of the equipment tend to be consistent, the operation and maintenance or replacement of a single equipment are prevented from being required when the service life of the single equipment is reached prematurely, the service life of the whole equipment is prolonged, and the operation and maintenance period is reduced.
Further, when two or more refrigeration cycle loops are started, if the temperature of the energy storage battery cluster is smaller than a preset closing threshold value, one of the refrigeration cycle loops is closed first.
According to different battery temperature criteria, the refrigeration cycle is exited in a gradient manner, the battery clusters are subjected to heat dissipation in a targeted manner, the number of equipment input is further selected according to heat dissipation requirements, and heat dissipation control is accurately achieved.
Further, the two or more refrigeration cycle circuits are turned off in such a manner that the refrigeration cycle circuit having the longest total time of use is preferentially turned off.
To even further equalize the equipment life, the cycle is also selected to be turned off preferentially for longer total run lengths when the refrigeration cycle is taken out of service.
Further, in order to reduce interference, the temperature of the battery cluster is more conveniently and accurately obtained, and the temperature of the battery cluster is reflected through the temperature of the cooling medium at the inlet of the water cooling plate of the battery cluster.
Further, a variable frequency circulating pump is adopted as the liquid cooling circulating pump in the liquid cooling circulating loop.
Further, a variable frequency compressor is adopted as a compressor in the refrigeration cycle loop, and an electronically adjustable expansion valve is adopted as an expansion valve.
According to the invention, the frequency conversion equipment is further selected, so that the heat dissipation control is more refined, the heat dissipation requirement is accurately met, and the energy waste caused by excessive heat dissipation capability input is avoided.
Further, the refrigerating circulation loop is also connected with a liquid storage device in series, and the liquid storage device is used for guaranteeing the supply of the refrigerant and realizing temporary storage of the refrigerant in the refrigerant circulation process.
When the refrigerating cycle of the system needs to reduce the supply amount of the refrigerant (refrigerant), the liquid storages connected in series in the cycle can store the refrigerant; when the refrigerating system stops working, the refrigerant in the system can be fully stored in the liquid storage device, so that the loss caused by the leakage of the system is avoided.
The device further comprises a liquid supplementing branch, wherein a liquid storage tank is connected in the liquid supplementing branch, the liquid below the liquid level of the liquid storage tank is connected with a liquid cooling cycle through a liquid supplementing pipe, and the liquid supplementing pipe is connected with an expansion water tank; the gas cavity above the liquid level of the liquid storage tank is connected with the atmosphere through a pressure relief pipe and an expansion valve.
According to the variable-frequency multi-system energy storage liquid cooling unit and the control method thereof, through optimizing control logic, constant-temperature operation of the energy storage battery cluster can be ensured, and the reliability and stability of continuous operation of energy storage equipment can be greatly improved.
Drawings
FIG. 1 is a schematic diagram of a multi-system energy storage liquid cooling unit according to an embodiment; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 2 is a flow chart illustrating a pump cycle mode control of a multi-system energy storage liquid cooling unit according to an embodiment;
FIG. 3 is a flow chart illustrating a refrigeration mode control of a multi-system energy storage liquid cooling unit according to an embodiment;
FIG. 4 is a flow chart of a heating mode control of a multi-system energy storage liquid cooling unit in an embodiment;
FIG. 5 is a flow chart illustrating control of a first compressor and a second compressor of a multi-system energy storage liquid cooling unit in accordance with an embodiment.
The drawings include: the system comprises a main circulating pump, a 2-fluid supplementing pump, a 3-electric heater, a 4-liquid storage tank, a 5-expansion tank, a 6-main filter, a 7-flowmeter, an 8-relief valve, a 9-liquid level meter, a 10-energy storage battery cluster water cooling plate, an 11-first compressor, a 12-first condenser, a 13-first liquid storage device, a 14-first electronic expansion valve, a 15-first air suction pressure sensor, a 16-first air suction temperature sensor, a 17-first air discharge pressure sensor, a 18-first air discharge temperature sensor, a 19-energy storage battery cluster inlet temperature sensor, a 20-energy storage battery cluster inlet pressure sensor, a 21-second compressor, a 22-second condenser, a 23-second liquid storage device, a 24-second electronic expansion valve, a 25-second air suction pressure sensor, a 26-second air suction temperature sensor, a 27-second air discharge pressure sensor, a 28-second air discharge temperature sensor, a 29-energy storage battery cluster outlet temperature sensor, a 30-energy storage battery cluster outlet pressure sensor and a 31-plate evaporator.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The multi-system energy-storage liquid cooling unit of the invention shown in fig. 1 comprises a liquid cooling circulation loop forming a liquid cooling circulation system, a first refrigeration loop and a second refrigeration loop forming a refrigeration system, wherein a plate evaporator 31 with three heat exchange ends (namely, three branches in the figure) is adopted in the embodiment; wherein the liquid cooling circulation loop, the first refrigeration loop and the second refrigeration loop are connected in parallel through three heat exchange ends of the plate evaporator 31.
In this embodiment, the present invention is described by taking two sets of refrigeration cycles as an example, and as other embodiments, more sets of refrigeration cycles may be obviously provided, and the total heat dissipation capacity of the refrigeration system may be enough to meet the maximum heat dissipation requirement of the battery system.
The first branch of the plate evaporator 31 is connected in series with one end of a liquid cooling circulation loop, the other end of the liquid cooling circulation loop is connected to the energy storage battery cluster water cooling plate 10 through a liquid cooling pipe, and the battery cluster water cooling plate 10 is used for exchanging heat with a battery cluster to dissipate heat of the battery cluster; the second branch of the plate evaporator 31 is connected in series with one end of a first refrigeration circuit, and the other end of the first refrigeration circuit is connected to the first condenser 12 through a soft copper pipe; the third branch of the plate evaporator 31 is connected in series at one end of the second refrigeration circuit, the other end of which is connected to the second condenser 22 via a soft copper tube.
The liquid cooling circulation loop comprises a main circulation loop, a water supplementing loop, an expansion tank 5, a pressure relief valve 8 and an instrument sensor. The main circulation loop comprises a main circulation pump 1, an electric heater 3, a main filter 6 and a cooling medium pipeline which are connected in series and are used for forming circulation; the liquid supplementing loop comprises a liquid storage tank 4, a liquid supplementing port is formed at the lower part of the liquid level of the liquid storage tank 4, for example, the bottom of the liquid supplementing port is connected with a certain section of cooling medium pipeline of the main circulation loop through a liquid supplementing pipeline connected with a liquid supplementing pump 2 in series, and an expansion tank 5 is further arranged on the liquid supplementing pipeline; a pressure relief pipeline is arranged above the liquid level of the liquid storage tank 4, such as at the top, and is communicated with the atmosphere through a pressure relief valve 8.
The liquid cooling circulation loop adopts a high-efficiency variable-frequency main circulation pump 1, and the rotating speed of the main circulation pump 1 can be adjusted according to pressure change and load conditions; the pipeline type PTC electric heater 3 is used for heating the circulating cooling medium in a low-temperature environment and providing a good running environment for the energy storage battery; the liquid supplementing box 4 is internally provided with a secondary refrigerant (cooling medium) and is provided with a liquid level meter 9, and when the liquid cooling circulation system needs to supplement the secondary refrigerant, the liquid supplementing pump 2 is started to supplement liquid; the expansion tank 5 is used for maintaining the pressure stability of the liquid cooling circulation system, and the liquid cooling circulation system is also provided with a safety pressure relief device 8 to ensure that the system reliably operates under the allowable pressure. In addition, the liquid cooling circulation system is provided with temperature, pressure and flow sensors for detecting system operation parameters, and because the secondary refrigerant is glycol and pure water mixed solution, the energy storage battery cluster water cooling plate 10 is made of aluminum materials, and in order to reduce the influence of electrochemical corrosion on the water cooling plate, all sensor liquid receiving materials adopt stainless steel 316.
As another embodiment, the main circulation pump 1 may be a constant frequency pump having no frequency conversion function.
The first refrigeration loop comprises a first compressor 11, a first condenser 12, a first liquid storage 13, a first electronic expansion valve 14 and a first instrument sensor which are sequentially connected in series; the second refrigeration circuit comprises a second compressor 21, a second condenser 22, a second liquid storage 23, a second electronic expansion valve 24 and a second instrument sensor which are sequentially connected in series. The refrigerating system is provided with liquid reservoirs 13 and 23 at the outlets of the condensers 12 and 22, and is used for adjusting and stabilizing the circulation quantity of the refrigerant in the system when the working condition of the refrigerating system changes; when the system circulation needs to increase the supply amount of the refrigerant, the liquid reservoirs 13 and 23 can ensure continuous supply; the accumulator 13, 23 is capable of temporarily storing refrigerant when the system cycle requires a reduced supply of refrigerant; when the refrigerating system stops working, the refrigerant in the system can be stored in the liquid storage tanks 13 and 23 completely, so that the loss caused by the leakage of the system can be avoided. The first refrigeration loop and the second refrigeration loop are independent of each other and do not affect each other, each refrigeration loop has at least 50% of refrigeration capacity required by refrigeration, and the fault of any refrigeration loop does not affect the normal operation of the other refrigeration loop.
The liquid cooling circulation system adopts glycol and pure water as the secondary refrigerant, the secondary refrigerant is cooled by the plate evaporator 31 and then enters the energy storage battery water cooling plate 10 through the liquid cooling piping under the power of the main circulation pump 1, the heat generated in the operation process of the energy storage battery is taken away, and the heated secondary refrigerant reenters the circulation pump 1, so that the heat dissipation and the cooling of the energy storage system are completed repeatedly.
The refrigerating system adopts environment-friendly refrigerants, the normal-temperature normal-pressure refrigerants are compressed by the high-efficiency variable-frequency compressors 11 and 21 to form high-temperature high-pressure gaseous refrigerants, the gaseous refrigerants enter the condensers 12 and 22 and are condensed into high-temperature liquid refrigerants by the environment air in the condensers 12 and 22 under the drive of the fans, the high-temperature liquid refrigerants are expanded by the electronic expansion valves 14 and 24 to become low-temperature low-pressure liquid refrigerants, the low-temperature low-pressure liquid refrigerants are evaporated at the heat exchange ends corresponding to the plate-type evaporators 31 with the heat of the secondary refrigerants to form the normal-temperature normal-pressure gaseous refrigerants, meanwhile, the heat of the plate-type evaporators 31 is absorbed, the temperature of the plate-type evaporators 31 is reduced to cool the secondary refrigerants passing through the first branch and corresponding to the heat ends, and the cooling of the secondary refrigerants is completed repeatedly.
As other embodiments, a fixed frequency compressor and a fixed ratio expansion valve are used for both the compressor and the expansion valve in the refrigeration system.
The dual-system energy storage liquid cooling unit of the embodiment further comprises a signal acquisition module, a control module and a display module.
The signal acquisition module is used for acquiring a temperature signal, a pressure signal, a flow signal and a liquid level signal by using the instrument sensor;
the temperature signal includes: the inlet temperature of the energy storage battery cluster water-cooling plate 10 collected by the energy storage battery cluster inlet temperature sensor 19, the outlet temperature of the energy storage battery cluster water-cooling plate 10 collected by the energy storage battery cluster outlet temperature sensor 29, the air suction temperature of the first compressor 11 collected by the first air suction temperature sensor 16, the air discharge temperature of the first compressor 11 collected by the first air discharge temperature sensor 18, the air suction temperature of the second compressor 21 collected by the second air suction temperature sensor 26, and the air discharge temperature of the second compressor 21 collected by the second air discharge temperature sensor 28.
The pressure signal includes: the inlet pressure of the energy storage battery cluster water-cooling plate 10 collected by the energy storage battery cluster inlet pressure sensor 20, the outlet pressure of the energy storage battery cluster collected by the outlet pressure sensor 30 of the energy storage battery cluster water-cooling plate 10, the suction pressure of the first compressor 11 collected by the first suction pressure sensor 15, the discharge pressure of the first compressor 11 collected by the first discharge pressure sensor 17, the suction pressure of the second compressor 21 collected by the second suction pressure sensor 25 and the discharge pressure of the second compressor 21 collected by the second discharge pressure sensor 27.
The flow signal includes: the flow rate of the liquid cooling circulation loop collected by the flowmeter 7.
The liquid level signal comprises: the liquid level of the liquid storage tank collected by the liquid level meter 9.
The control module is used for controlling the start, stop, speed regulation (aiming at corresponding equipment adopting frequency conversion or electric control) and protection of equipment such as the main circulating pump 1, the liquid supplementing pump 2, the heater 3, the compressors 11 and 21, the condenser fans 12 and 22 and the like by utilizing controllers such as a PLC (programmable logic controller), an ARM (advanced RISC machine) and the like.
And a display module: the system is used for displaying the running state, parameters and alarm information of the energy storage liquid cooling unit and providing a man-machine interaction interface for parameter setting.
As shown in fig. 2 and 3, the control flow of the pump circulation mode and the refrigeration mode is that the control method of the dual-system energy storage liquid cooling unit working in the refrigeration mode is as follows:
step 1: collecting the temperature of an energy storage battery cluster inlet, and starting the liquid cooling unit after starting delay when the temperature of the energy storage battery cluster inlet is larger than a starting temperature threshold of the liquid cooling unit;
step 2: after the liquid cooling unit is started, a main circulating pump 1 of the liquid cooling circulating system is started, and the liquid cooling unit enters a pump circulating mode to operate;
step 3: after the liquid cooling unit enters a pump circulation mode, collecting the inlet temperature of the energy storage battery cluster, and starting a refrigeration loop and entering the step 4 if the inlet temperature 19 of the energy storage battery cluster is still higher than the starting temperature of the liquid cooling unit within the equipment starting delay time; in the equipment starting delay time, if the temperature of the inlet of the energy storage battery cluster is not more than the temperature of the liquid cooling unit during starting, a refrigeration loop is not started, and the step 2 is returned;
step 4: after one refrigeration loop is started, the temperature 19 of the inlet of the energy storage battery cluster is continuously collected, and when the temperature 19 of the inlet of the energy storage battery cluster is larger than the temperature threshold value of the rest refrigeration loops, the other refrigeration loop is started.
As shown in fig. 4, the control method of the dual-system energy storage liquid cooling unit in the heating mode comprises the following steps:
step 1: collecting the temperature of an energy storage battery cluster inlet, and starting a main circulating pump 1 of the liquid cooling unit after time delay when the temperature of the energy storage battery cluster inlet is not greater than the starting temperature threshold of the electric heater;
step 2: when the operation time of the main circulating pump 1 is longer than the equipment start-up delay and the energy storage battery cluster inlet temperature 19 is not longer than the electric heater start-up temperature threshold, the electric heater is started up.
As shown in FIG. 5, the control method of the first compressor and the second compressor of the dual-system energy storage liquid cooling unit which both adopt frequency conversion or electric control equipment is as follows:
the first refrigeration loop corresponds to the first compressor 11, the second refrigeration loop corresponds to the second compressor 21, and the liquid cooling unit judges whether to start the compressors or not and the number of the started compressors according to the refrigerating demands of the system. As for the priority of starting the first or second compressor, it is necessary to judge according to the fault state and the operation time of the compressors, to start the non-faulty compressor preferentially, and if both compressors are non-faulty, to operate the compressor with short operation time preferentially, so as to ensure that the service lives of the compressors are close. When the compressors are closed, judging whether the compressors are closed or not and whether the compressors are closed or not according to the refrigerating demands of the unit. As for the preferential shut-down of the first or second compressor, it is necessary to judge according to the operation time of the compressor, to preferentially shut down the compressor having a long operation time.
According to the double-system energy storage liquid cooling unit and the corresponding control method, the refrigerating system is configured by 1+1, and by arranging 2 sets of independent refrigerating systems, when any refrigerating system fails, the whole liquid cooling system still has 50% refrigerating capacity, so that the redundancy capacity and reliability of the liquid cooling system are improved. Meanwhile, through optimizing the control logic, the constant-temperature operation of the energy storage battery cluster can be ensured, and the continuous operation stability of the energy storage equipment can be greatly improved. In addition, in the liquid cooling circulation system, all the sensor liquid receiving materials are made of stainless steel 316, so that the metal types in the liquid cooling circulation pipeline, which are in contact with the secondary refrigerant, are not more than 1, the leakage of the water cooling plates of the energy storage battery clusters caused by electrochemical corrosion can be effectively avoided, and the reliability of the energy storage equipment is further improved.
Claims (10)
1. The multi-system energy storage liquid cooling unit is characterized by comprising a liquid cooling circulation loop and at least two refrigeration circulation loops; an energy storage battery cluster water cooling plate for radiating the energy storage power station battery clusters and a heat exchange end of the evaporator are connected in series in the liquid cooling circulation loop; the evaporator also comprises heat exchange ends which are in one-to-one correspondence with the refrigeration cycle loops and are respectively connected in series with the corresponding refrigeration cycle loops to play a role of the evaporator, and the refrigeration cycle loops and the corresponding heat exchange ends form refrigerant circulation.
2. The multi-system energy storage and liquid cooling unit according to claim 1, wherein when the temperature of the energy storage battery cluster is greater than a set threshold value, the liquid cooling circulation of the liquid cooling circulation loop is started; after the set time, if the temperature of the energy storage battery cluster is still greater than the set threshold value, starting the refrigerant circulation of a refrigeration circulation loop; and after the set time, if the temperature of the energy storage battery cluster is still greater than the set threshold value, restarting the refrigerant circulation of the next refrigeration cycle.
3. The multi-system energy storage and fluid cooling unit of claim 2, wherein the refrigeration cycle is started in a sequence that preferentially starts the refrigeration cycle having the shorter total duration of use.
4. The multi-system energy storage and liquid cooling unit of claim 3, wherein when two or more refrigeration cycle loops are activated, one of the refrigeration cycle loops is first turned off if the energy storage battery cluster temperature is less than a preset shutdown threshold.
5. A multi-system energy storage and liquid cooling unit as claimed in claim 3 wherein the order of closing two or more refrigeration cycle circuits is such that the refrigeration cycle circuit having the longest total time of use is preferentially closed.
6. The multi-system energy storage and fluid cooling unit of claim 5, wherein the energy storage cell cluster temperature is reflected by the temperature of the energy storage cell cluster water cooling plate inlet cooling medium.
7. The multi-system energy storage liquid cooling unit of claim 1, wherein the liquid cooling circulation pump in the liquid cooling circulation loop is a variable frequency circulation pump.
8. The multi-system energy-storage liquid-cooling unit of claim 6, wherein the compressor in the refrigeration cycle is a variable frequency compressor and the expansion valve is an electronically adjustable expansion valve.
9. The multi-system energy-storing liquid cooling unit as set forth in claim 7, wherein the refrigerating circulation loop is further connected with a liquid storage device in series for ensuring the supply of the refrigerant and realizing temporary storage of the refrigerant during the circulation of the refrigerant.
10. The multi-system energy storage liquid cooling unit according to claim 1, further comprising a liquid supplementing branch, wherein a liquid storage tank is connected in the liquid supplementing branch, liquid cooling circulation is connected below the liquid level of the liquid storage tank through a liquid supplementing pipe, and an expansion water tank is connected on the liquid supplementing pipe; the gas cavity above the liquid level of the liquid storage tank is connected with the atmosphere through a pressure relief pipe and an expansion valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117438700A (en) * | 2023-12-21 | 2024-01-23 | 常州博瑞电力自动化设备有限公司 | Efficient energy-saving split type water chiller system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117438700A (en) * | 2023-12-21 | 2024-01-23 | 常州博瑞电力自动化设备有限公司 | Efficient energy-saving split type water chiller system and control method thereof |
| CN117438700B (en) * | 2023-12-21 | 2024-03-29 | 常州博瑞电力自动化设备有限公司 | Efficient energy-saving split type water chiller system and control method thereof |
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