CN119009251A - Liquid cooling unit for energy storage system and operation method thereof - Google Patents
Liquid cooling unit for energy storage system and operation method thereof Download PDFInfo
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- CN119009251A CN119009251A CN202411044404.0A CN202411044404A CN119009251A CN 119009251 A CN119009251 A CN 119009251A CN 202411044404 A CN202411044404 A CN 202411044404A CN 119009251 A CN119009251 A CN 119009251A
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- 239000007788 liquid Substances 0.000 title claims abstract description 363
- 238000004146 energy storage Methods 0.000 title claims abstract description 94
- 238000001816 cooling Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002826 coolant Substances 0.000 claims abstract description 281
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- -1 floccules Substances 0.000 description 1
- 239000012213 gelatinous substance Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01M10/61—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
- H01M10/63—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
- H01M10/65—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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
本发明公开了一种储能系统用液冷机组及其运行方法，其包括主循环泵、带有风机的散热器、第一换热器和第二换热器；液冷介质能够依次经过主循环泵的液冷介质通道、散热器的液冷介质通道，并分流至第一换热器的液冷介质通道和第二换热器的液冷介质通道，再汇流至主循环泵的液冷介质通道；液冷介质还能够依次经过主循环泵的液冷介质通道、散热器的液冷介质通道、第二换热器的液冷介质通道以及第一换热器的液冷介质通道，再回流至主循环泵的液冷介质通道。本发明主要解决如何为储能系统提供能够同时对电池组和变流器进行热管理的液冷机组的问题；本发明通过一组液冷机组，即可实现对储能系统中的电池组和电力转换装置(尤其是变流器)的集中供冷。
The present invention discloses a liquid cooling unit for an energy storage system and an operation method thereof, which includes a main circulation pump, a radiator with a fan, a first heat exchanger, and a second heat exchanger; the liquid cooling medium can sequentially pass through the liquid cooling medium channel of the main circulation pump and the liquid cooling medium channel of the radiator, and be diverted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then converge to the liquid cooling medium channel of the main circulation pump; the liquid cooling medium can also sequentially pass through the liquid cooling medium channel of the main circulation pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger, and the liquid cooling medium channel of the first heat exchanger, and then flow back to the liquid cooling medium channel of the main circulation pump. The present invention mainly solves the problem of how to provide a liquid cooling unit for an energy storage system that can simultaneously perform thermal management on a battery pack and a converter; the present invention can realize centralized cooling of a battery pack and a power conversion device (especially a converter) in an energy storage system through a group of liquid cooling units.
Description
Technical Field
The invention relates to the technical field of thermal management systems, in particular to a liquid cooling unit for an energy storage system and an operation method thereof.
Background
An energy storage system is a system for storing and releasing electrical energy, which involves the conversion between electrical energy and chemical energy, and also between electrical energy and electrical energy, during which, more heat can be generated, if the heat cannot be timely discharged, the temperature of the energy storage system can be increased, so that potential safety hazards are brought, and the performance, the service life and the normal operation of the energy storage system are further affected.
The lithium ion battery pack is one of the cores of an energy storage system, and can exert the maximum energy efficiency in a proper temperature zone, and in the past, the optimal energy efficiency temperature zone of the lithium ion battery pack is 15-45 ℃; in order to control the temperature of an energy storage system (especially a lithium ion battery pack), a heat dissipation system needs to be configured in the energy storage system so as to dissipate heat of the energy storage system, wherein a liquid cooling heat dissipation system adopting a phase change refrigeration technology is the most widely used heat dissipation scheme.
With the continuous development of battery technology, the optimal energy efficiency temperature area of the new generation battery cell can reach 60 ℃, the temperature area regulated and controlled by the traditional liquid cooling heat dissipation system is far lower than the optimal energy efficiency temperature area of the new generation battery cell, and the temperature control of the energy storage system can be completed by adopting the energy storage system of the new generation battery cell without adopting a phase change refrigeration technology and only using a liquid cooling heat dissipation system with air-water linkage (namely adopting a forced convection mode to dissipate heat of cooling liquid in the liquid cooling heat dissipation system) in consideration of the factors of environmental protection and energy conservation, system complexity reduction, overall cost control of the energy storage system and the like.
Meanwhile, the converter (Power Conversion System, PCS) in the energy storage system comprises a controller, power electronic devices, necessary peripheral circuits and other components, and also has heat dissipation requirements, and the optimal energy efficiency temperature area of the converter is basically consistent with that of the new-generation battery cell.
In summary, how to provide a liquid cooling unit capable of simultaneously performing thermal management on a battery pack and a converter for an energy storage system is one of the problems to be solved.
Disclosure of Invention
The invention aims to provide a liquid cooling unit for an energy storage system and an operation method thereof, which can simultaneously carry out heat management on a battery pack and a power conversion device in the energy storage system.
In order to achieve the above purpose, the present invention provides the following technical solutions: the liquid cooling unit is used for radiating the energy storage system, and the energy storage system at least comprises a battery pack and an electric power conversion device; the heat exchanger comprises a main circulating pump, a radiator with a fan, and a first heat exchanger and a second heat exchanger which can exchange heat with a heating body; the first heat exchanger can exchange heat with a battery pack of the energy storage system, and the second heat exchanger can exchange heat with a power conversion device of the energy storage system; the liquid cooling medium can selectively pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator in sequence, and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation; the liquid cooling medium can also selectively pass through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger in sequence, and then flow back to the liquid cooling medium channel of the main circulating pump to form circulation.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a first three-way valve and a second three-way valve; the first three-way valve and the second three-way valve comprise an a port, a b port and a c port which are controlled by an upper computer to be opened/closed; after the liquid cooling medium channel of the main circulating pump is sequentially communicated with the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the main circulating pump is shunted and communicated to the liquid cooling medium channel of the second heat exchanger and the port a of the second three-way valve, the liquid cooling medium channel of the second heat exchanger is communicated to the port a of the first three-way valve, the port b of the second three-way valve is communicated to the liquid cooling medium channel of the first heat exchanger, the port c of the first three-way valve is communicated to the port c of the second three-way valve, and after the liquid cooling medium channel of the first heat exchanger and the port b of the first three-way valve are converged, the liquid cooling medium channel of the main circulating pump is communicated to the liquid cooling medium channel of the main circulating pump.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a heater for heating the liquid cooling medium; the heater is connected between the port b of the second three-way valve and the liquid cooling medium channel of the first heat exchanger.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a filter for filtering the liquid cooling medium; the filter is connected to any node of the liquid cooling unit for the energy storage system.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a first pressure sensor and a first temperature sensor; the first pressure sensor and the first temperature sensor are both connected to the liquid inlet end of the main circulating pump.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a surge tank for balancing the pressure of the liquid cooling medium; the surge tank is connected to any node of the liquid cooling unit for the energy storage system.
In the above technical scheme, the liquid cooling unit for the energy storage system further comprises a second pressure sensor and a second temperature sensor; the second pressure sensor and the second temperature sensor are both connected to the liquid outlet end of the radiator.
The operation method of the liquid cooling unit for the energy storage system is applied to the liquid cooling unit for the energy storage system; the method comprises the following steps:
Selectively entering one of the following modes of operation based on ambient temperature:
Cooling mode: the fan of the radiator operates, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
Self-circulation mode: the fan of the radiator is stopped, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
Heating mode: the fan of the radiator is stopped, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger, and then flows back to the liquid cooling medium channel of the main circulating pump to form circulation.
In the above technical solution, the operation conditions of the refrigeration mode are as follows: the ambient temperature is more than or equal to 30 ℃; the operating conditions of the self-circulation mode are: the ambient temperature is more than or equal to 0 ℃ and less than 30 ℃; the operation conditions of the heating mode are as follows: the ambient temperature is less than 0 ℃.
In the technical scheme, the first three-way valve and the second three-way valve of the liquid cooling unit for the energy storage system; the first three-way valve and the second three-way valve comprise an a port, a b port and a c port which are controlled by an upper computer to be opened/closed; after the liquid cooling medium channel of the main circulating pump is sequentially communicated with the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the port a of the second three-way valve are in shunt communication, the liquid cooling medium channel of the second heat exchanger is communicated with the port a of the first three-way valve, the port b of the second three-way valve is communicated with the liquid cooling medium channel of the first heat exchanger, the port c of the first three-way valve is communicated with the port c of the second three-way valve, and after the liquid cooling medium channel of the first heat exchanger and the port b of the first three-way valve are converged, the liquid cooling medium channel of the first heat exchanger is communicated with the liquid cooling medium channel of the main circulating pump; when entering the refrigeration mode or the self-circulation mode: the port a and the port b of the first three-way valve are opened, the port c of the first three-way valve is closed, the port a and the port b of the second three-way valve are opened, and the port c of the second three-way valve is closed, so that a liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator, is split into the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation; when entering the heating mode: the port a and the port c of the first three-way valve are opened, the port b of the first three-way valve is closed, the port b and the port c of the second three-way valve are opened, and the port a of the second three-way valve is closed, so that a liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger and then flows back to the liquid cooling medium channel of the main circulating pump to form circulation.
Compared with the prior art, the invention has the beneficial effects that: according to the liquid cooling unit for the energy storage system and the operation method thereof, a phase change refrigerating mechanism is not required to be arranged, concentrated cooling of the battery pack and the power conversion device (particularly the converter) in the energy storage system can be realized through one group of liquid cooling units in a medium-high temperature environment, so that the temperatures of the battery pack and the power conversion device are reduced, the number, the complexity and the economic cost of components of the liquid cooling unit and the energy storage system are reduced, and the operation stability of the liquid cooling unit and the energy storage system is improved; and in a low-temperature environment, the heat generated by the power conversion device can be used for heating the battery pack, so that waste heat can be effectively utilized, and the energy storage system is more energy-saving and environment-friendly while the normal operation of the energy storage system is maintained.
Drawings
Fig. 1 is a system configuration view of the present invention.
FIG. 2 is a schematic diagram showing the flow of the liquid cooling medium in the cooling mode or the self-circulation mode according to the present invention.
FIG. 3 is a schematic diagram showing the flow direction of the liquid cooling medium in the heating mode according to the present invention.
The reference numerals are: 1. a main circulation pump; 2. a heat sink; 3. a blower; 4. a filter; 5. a first heat exchanger; 6. a heater; 7. a second heat exchanger; 8. a surge tank; 9-1, a first three-way valve; 9-2, a second three-way valve; TT1, a first temperature sensor; TT2, a second temperature sensor; PT1, a first pressure sensor; PT2, a second pressure sensor; 10. a battery pack; 20. a current transformer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a liquid cooling unit for an energy storage system, which is used for radiating heat for the energy storage system.
The energy storage system at least comprises a battery pack 10 and a power conversion device 20, and in this embodiment, a current transformer (Power Conversion System, PCS) commonly used in the energy storage system is used as a typical case of the power conversion device 20, and the technical scheme of the present invention is specifically described.
Referring to fig. 1, the liquid cooling unit for an energy storage system of the present embodiment includes a main circulation pump 1, a radiator 2 with a fan 3, and a first heat exchanger 5 and a second heat exchanger 7 capable of heat exchange with a heating element; the main circulation pump 1 is a liquid pump capable of driving a liquid cooling medium to flow, the radiator 2 is a metal radiator with a plurality of liquid flow channels, and radiating fins are arranged between the liquid flow channels, and the radiator can radiate heat for the liquid cooling medium flowing through the radiator in a forced convection or natural convection mode.
The first heat exchanger 5 can exchange heat with the battery pack 10 of the energy storage system, in this embodiment, the first heat exchanger 5 is a metal plate with good heat conduction performance and an internal flow channel, and is attached/built in the battery pack 10 of the energy storage system; the second heat exchanger 7 is capable of exchanging heat with the power conversion device 20 of the energy storage system, in some possible embodiments, the second heat exchanger 7 is a metal plate with good heat conduction performance and an internal flow channel, which is attached/built-in at the power conversion device 20 of the energy storage system, in other possible embodiments, the second heat exchanger 7 is a liquid cooling heat dissipation flow channel integrated by the power conversion device 20, and can be communicated to the second heat exchanger 7 through a liquid cooling medium interface integrated by the power conversion device 20.
The liquid cooling medium can selectively pass through the liquid cooling medium channel of the main circulating pump 1 and the liquid cooling medium channel of the radiator 2 in sequence, and is split into the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, and then is converged to the liquid cooling medium channel of the main circulating pump 1 from the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 to form circulation.
The liquid cooling medium can also selectively pass through the liquid cooling medium channel of the main circulating pump 1, the liquid cooling medium channel of the radiator 2, the liquid cooling medium channel of the second heat exchanger 7 and the liquid cooling medium channel of the first heat exchanger 5 in sequence, and then flow back to the liquid cooling medium channel of the main circulating pump 1 to form circulation.
Specifically, the liquid cooling unit for an energy storage system of the present embodiment further includes a first three-way valve 9-1 and a second three-way valve 9-2, where the first three-way valve 9-1 and the second three-way valve 9-2 are both electric control valves, such as electric three-way valves or magnetic control three-way valves; the first three-way valve 9-1 and the second three-way valve 9-2 each include an a port, a b port and a c port which are opened/closed under the control of an upper computer (e.g., a programmable controller, an embedded system and an industrial computer); after the liquid cooling medium channel of the main circulating pump 1 is sequentially communicated with the liquid cooling medium channel of the radiator 2, the liquid cooling medium channel of the second heat exchanger 7 and the port a of the second three-way valve 9-2 are in shunt communication, the liquid cooling medium channel of the second heat exchanger 7 is communicated with the port a of the first three-way valve 9-1, the port b of the second three-way valve 9-2 is communicated with the liquid cooling medium channel of the first heat exchanger 5, the port c of the first three-way valve 9-1 is communicated with the port c of the second three-way valve 9-2, and after the liquid cooling medium channel of the first heat exchanger 5 and the port b of the first three-way valve 9-1 are converged, the liquid cooling medium channel of the second heat exchanger is communicated with the liquid cooling medium channel of the main circulating pump 1; it will be appreciated that the above-described nodes are all connected by a conduit adapted to pass a liquid cooling medium.
Further, the liquid cooling unit for an energy storage system of this embodiment further includes a heater 6 for heating the liquid cooling medium, where the heater 6 is an electrothermal liquid heater for avoiding the temperature of the liquid cooling medium being too low; the heater 6 is connected between the b port of the second three-way valve 9-2 and the liquid cooling medium passage of the first heat exchanger 5.
Further, the liquid cooling unit for an energy storage system of the embodiment further includes a filter 4 for filtering the liquid cooling medium, where the filter 4 is a special-purpose filter for the liquid cooling medium commonly used in the prior art, and can filter out impurities such as particles, floccules, and gelatinous substances in the liquid cooling medium, so that the liquid cooling medium can maintain good heat conduction performance and fluidity; the filter 4 is connected to any node of the liquid cooling unit for the energy storage system, and in this embodiment, the filter 4 is connected between the radiator 2 and the a port of the first three-way valve 9-1.
Further, the liquid cooling unit for an energy storage system of the embodiment further includes a first pressure sensor PT1 and a first temperature sensor TT1; the first pressure sensor PT1 and the first temperature sensor TT1 are both connected to the liquid inlet end of the main circulating pump 1; it can be understood that the first pressure sensor PT1 and the first temperature sensor TT1 are respectively connected with an upper computer (such as a programmable controller, an embedded system and an industrial computer) in a signal manner, so as to transmit the pressure and the temperature of the liquid cooling medium at the liquid inlet end of the main circulation pump 1 to the upper computer.
In the liquid cooling unit for the energy storage system, due to factors such as temperature change, small leakage or evaporation of the liquid cooling medium, too little/too much filling amount of the liquid cooling medium, operation fluctuation of the main circulating pump 1 and the like, the pressure of the liquid cooling medium in the liquid cooling unit for the energy storage system can change, the normal operation in the liquid cooling unit for the energy storage system can be influenced, and even a pipeline is damaged and falls off; in order to solve the above problems, the liquid cooling unit for an energy storage system of the present embodiment further includes a surge tank 8 for balancing the pressure of the liquid cooling medium; the surge tank 8 is connected to any node of the liquid cooling unit for the energy storage system, and in this embodiment, the surge tank 8 is connected to the liquid inlet end of the main circulation pump 1; the pressure stabilizing tank 8 is arranged and can provide pressure for the liquid cooling unit for the energy storage system, so that the pressure of the liquid cooling unit for the energy storage system is ensured to be maintained in a proper interval; in some possible embodiments, the electric control device of the surge tank 8 is in signal connection with an upper computer (such as a programmable controller, an embedded system and an industrial computer), and the upper computer controls the electric control device of the surge tank 8 to operate according to the liquid cooling medium pressure transmitted by the first pressure sensor PT1, so as to realize closed-loop control.
Further, the liquid cooling unit for an energy storage system of the embodiment further includes a second pressure sensor PT2 and a second temperature sensor TT2; the second pressure sensor PT2 and the second temperature sensor TT2 are both connected to the liquid outlet end of the radiator 2; it can be understood that the second pressure sensor PT2 and the second temperature sensor TT2 are respectively connected with an upper computer (such as a programmable controller, an embedded system and an industrial computer) in a signal manner, so as to transmit the pressure and the temperature of the liquid cooling medium at the liquid outlet end of the radiator 2 to the upper computer.
The embodiment also provides an operation method of the liquid cooling unit for the energy storage system, which is applied to the liquid cooling unit for the energy storage system.
Referring to fig. 1-3, the method includes:
Selectively entering one of the following modes of operation based on ambient temperature:
Cooling mode (as shown in fig. 2): the fan 3 of the radiator 2 operates, the main circulating pump 1 operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump 1 and the liquid cooling medium channel of the radiator 2 and is shunted to the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, and then is converged to the liquid cooling medium channel of the main circulating pump 1 from the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 to form circulation.
The cooling mode is suitable for a high temperature environment, at this time, the fan 3 of the radiator 2 is operated to radiate the high temperature liquid cooling medium flowing through the radiator 2 in a forced convection mode, so that the high temperature liquid cooling medium flowing through the radiator 2 can be rapidly cooled.
Self-circulation mode (as shown in fig. 2): the fan 3 of the radiator 2 is stopped, the main circulating pump 1 operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump 1 and the liquid cooling medium channel of the radiator 2 and is shunted to the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, and then is converged to the liquid cooling medium channel of the main circulating pump 1 from the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 to form circulation.
The self-circulation mode is suitable for medium temperature environment, at this moment, the fan 3 of the radiator 2 is stopped, and the natural heat exchange between the radiator 2 and the air is enough to radiate the high-temperature liquid cooling medium flowing through the radiator 2, so that the high-temperature liquid cooling medium flowing through the radiator 2 is cooled; the fan 3 is stopped, so that the electric energy consumed by the liquid cooling unit for the energy storage system can be saved.
Heating mode (as shown in fig. 3): the fan 3 of the radiator 2 is stopped, the main circulating pump 1 runs, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump 1, the liquid cooling medium channel of the radiator 2, the liquid cooling medium channel of the second heat exchanger 7 and the liquid cooling medium channel of the first heat exchanger 5, and then flows back to the liquid cooling medium channel of the main circulating pump 1 to form circulation.
The battery pack 10 of the energy storage system and the battery pack in the cold environment have insufficient heat generated by the operation of the battery pack, the performance of the battery pack 10 can be influenced by the excessively low temperature, and in addition, if the temperature of the liquid cooling medium is reduced below the freezing point of the liquid cooling medium to freeze, the liquid cooling unit can be damaged; the heating mode is suitable for a cold environment, and at the moment, the fan 3 of the radiator 2 is stopped (an upper computer can be used for prohibiting the fan 3 from running in a software mode); the power electronics of the power conversion device 20 can be normally used even in a cold environment, and generate heat, and the heat of the power conversion device 20 is absorbed by the second heat exchanger 7, so that the liquid cooling medium can be heated by the heat of the power conversion device 20 while maintaining the temperature of the power conversion device 20, and when the liquid cooling medium having a relatively high temperature flows to the first heat exchanger 5, the heat can be transferred to the battery pack 10 by the first heat exchanger 5, thereby maintaining the temperature of the battery pack 10.
At colder ambient temperatures (e.g., the ambient temperature is already below the freezing point of the liquid cooling medium, and/or the temperature of the liquid cooling medium transmitted by the first temperature sensor TT1 and/or the second temperature sensor TT2 is already below the freezing point thereof), the heat generated by the normal operation of the power conversion device 20 is insufficient to heat the liquid cooling medium to a suitable temperature region, so that the battery pack 10, the power conversion device 20 and the liquid cooling unit of the energy storage system are at risk of shutdown and damage; at this time, the heater 6 may be turned on, and more heat is provided to the liquid cooling medium by the heater 6, so that the liquid cooling medium is heated to a suitable temperature zone, thereby maintaining the normal operation of the battery pack 10, the power conversion device 20 and the liquid cooling unit of the energy storage system.
Specifically, the operating conditions for the cooling mode are: the ambient temperature is more than or equal to 30 ℃; the operating conditions of the self-circulation mode are: the ambient temperature is more than or equal to 0 ℃ and less than 30 ℃; the operating conditions of the heating mode are: the ambient temperature is less than 0 ℃.
When the refrigerating mode or the self-circulation mode is entered, the above-mentioned mode: the port a and the port b of the first three-way valve 9-1 are opened, the port c of the first three-way valve 9-1 is closed, the port a and the port b of the second three-way valve 9-2 are opened, and the port c of the second three-way valve 9-2 is closed, so that the liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump 1 and the liquid cooling medium channel of the radiator 2, and is split into the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, and then the liquid cooling medium channels of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 are converged to the liquid cooling medium channel of the main circulating pump 1 to form circulation; when entering a heating mode: the port a and the port c of the first three-way valve 9-1 are opened, the port b of the first three-way valve 9-1 is closed, the port b and the port c of the second three-way valve 9-2 are opened, and the port a of the second three-way valve 9-2 is closed, so that the liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump 1, the liquid cooling medium channel of the radiator 2, the liquid cooling medium channel of the second heat exchanger 7 and the liquid cooling medium channel of the first heat exchanger 5, and then flows back to the liquid cooling medium channel of the main circulating pump 1 to form circulation.
The liquid cooling unit for the energy storage system and the operation method thereof in the embodiment have the working principle that: in the refrigeration mode or the self-circulation mode, the liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulation pump 1 and the liquid cooling medium channel of the radiator 2, and is distributed by the first three-way valve 9-1 and the second three-way valve 9-2, so that the liquid cooling medium is split into the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, at the moment, the first heat exchanger 5 absorbs the heat of the battery pack 10, the second heat exchanger 7 absorbs the heat of the power conversion device 20, and the liquid cooling medium with higher temperature is converged to the liquid cooling medium channel of the main circulation pump 1 from the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 and then enters the liquid cooling medium channel of the radiator 2, so that the liquid cooling medium in the radiator 2 can be radiated by a forced convection mode or through natural heat exchange between the radiator 2 and air; in the heating mode, the liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulation pump 1 and the liquid cooling medium channel of the radiator 2, and is distributed through the first three-way valve 9-1 and the second three-way valve 9-2, so that the liquid cooling medium sequentially passes through the liquid cooling medium channel of the second heat exchanger 7 and the liquid cooling medium channel of the first heat exchanger 5, and then flows back to the liquid cooling medium channel of the main circulation pump 1 to form circulation, and in the process, the liquid cooling medium passes through the second heat exchanger 7 to absorb the heat of the power conversion device 20, so that the temperature of the power conversion device 20 is maintained, the liquid cooling medium can be heated by the heat of the power conversion device 20, and when the liquid cooling medium with higher temperature flows to the first heat exchanger 5, the heat can be transferred to the battery pack 10 by the first heat exchanger 5, so that the temperature of the battery pack 10 is maintained.
It can be understood that the liquid cooling unit for the energy storage system of this embodiment is configured with an upper computer (for example, a programmable controller, an embedded system, and an industrial computer); the actuators of the first three-way valve 9-1 and the second three-way valve 9-2 are connected with the upper computer through a general input/output interface or a communication interface, so that the first three-way valve 9-1 and the second three-way valve 9-2 can be controlled by the upper computer, and further the independent opening/closing of an a port, a b port and a c port is realized; the first temperature sensor TT1, the second temperature sensor TT2, the first pressure sensor PT1 and the second pressure sensor PT2 are connected with a signal of an upper computer through a general input/output interface, an analog quantity interface or a communication interface.
It can be understood that the detection of the ambient temperature can be realized by a temperature sensor arranged near the energy storage system or in the machine room/machine box, and the temperature sensor is connected with the upper computer through an analog output interface or a communication interface, so that the detection and the transmission of the ambient temperature are realized.
According to the liquid cooling unit for the energy storage system and the operation method thereof, liquid cooling medium can selectively pass through the liquid cooling medium channel of the main circulating pump 1 and the liquid cooling medium channel of the radiator 2 in sequence, and is shunted to the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7, and then is converged to the liquid cooling medium channel of the main circulating pump 1 from the liquid cooling medium channel of the first heat exchanger 5 and the liquid cooling medium channel of the second heat exchanger 7 to form circulation; the liquid cooling medium can also selectively pass through the liquid cooling medium channel of the main circulating pump 1, the liquid cooling medium channel of the radiator 2, the liquid cooling medium channel of the second heat exchanger 7 and the liquid cooling medium channel of the first heat exchanger 5 in sequence, and then flow back to the liquid cooling medium channel of the main circulating pump 1 to form circulation; according to the liquid cooling unit for the energy storage system and the operation method thereof, a phase change refrigerating mechanism is not required to be arranged, concentrated cooling of the battery pack 10 and the power conversion device 20 (particularly the converter) in the energy storage system can be realized through one group of liquid cooling units in a medium-high temperature environment, so that the temperatures of the battery pack 10 and the power conversion device 20 are reduced, the number of components, the complexity and the economic cost of the liquid cooling unit and the energy storage system are reduced, and the operation stability of the liquid cooling unit and the energy storage system is improved; in the low-temperature environment, the heat generated by the power conversion device 20 can be used for heating the battery pack 10, so that the waste heat can be effectively utilized, and the energy storage system is more energy-saving and environment-friendly while the normal operation of the energy storage system is maintained.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The liquid cooling unit is used for radiating the energy storage system, and the energy storage system at least comprises a battery pack and an electric power conversion device; it is characterized in that the method comprises the steps of,
The heat exchanger comprises a main circulating pump, a radiator with a fan, and a first heat exchanger and a second heat exchanger which can exchange heat with a heating body;
the first heat exchanger can exchange heat with a battery pack of the energy storage system, and the second heat exchanger can exchange heat with a power conversion device of the energy storage system;
The liquid cooling medium can selectively pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator in sequence, and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
The liquid cooling medium can also selectively pass through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger in sequence, and then flow back to the liquid cooling medium channel of the main circulating pump to form circulation.
2. The liquid cooling unit for an energy storage system according to claim 1, further comprising a first three-way valve and a second three-way valve;
the first three-way valve and the second three-way valve comprise an a port, a b port and a c port which are controlled by an upper computer to be opened/closed;
After the liquid cooling medium channel of the main circulating pump is sequentially communicated with the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the main circulating pump is shunted and communicated to the liquid cooling medium channel of the second heat exchanger and the port a of the second three-way valve, the liquid cooling medium channel of the second heat exchanger is communicated to the port a of the first three-way valve, the port b of the second three-way valve is communicated to the liquid cooling medium channel of the first heat exchanger, the port c of the first three-way valve is communicated to the port c of the second three-way valve, and after the liquid cooling medium channel of the first heat exchanger and the port b of the first three-way valve are converged, the liquid cooling medium channel of the main circulating pump is communicated to the liquid cooling medium channel of the main circulating pump.
3. The liquid cooling unit for an energy storage system according to claim 2, further comprising a heater for heating the liquid cooling medium;
the heater is connected between the port b of the second three-way valve and the liquid cooling medium channel of the first heat exchanger.
4. A liquid cooling unit for an energy storage system according to any one of claims 1 to 3, further comprising a filter for filtering a liquid cooling medium;
The filter is connected to any node of the liquid cooling unit for the energy storage system.
5. A liquid cooling unit for an energy storage system according to any one of claims 1 to 3, further comprising a first pressure sensor and a first temperature sensor;
The first pressure sensor and the first temperature sensor are both connected to the liquid inlet end of the main circulating pump.
6. The liquid cooling unit for an energy storage system according to claim 5, further comprising a surge tank for balancing the pressure of the liquid cooling medium;
the surge tank is connected to any node of the liquid cooling unit for the energy storage system.
7. A liquid cooling unit for an energy storage system according to any one of claims 1 to 3, further comprising a second pressure sensor and a second temperature sensor;
the second pressure sensor and the second temperature sensor are both connected to the liquid outlet end of the radiator.
8. A method of operating a liquid cooling unit for an energy storage system, characterized in that it is applied to the liquid cooling unit for an energy storage system according to any one of claims 1 to 7; the method comprises the following steps:
Selectively entering one of the following modes of operation based on ambient temperature:
Cooling mode: the fan of the radiator operates, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
Self-circulation mode: the fan of the radiator is stopped, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator and is shunted to the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and then is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
Heating mode: the fan of the radiator is stopped, the main circulating pump operates, and the liquid cooling medium is driven to sequentially pass through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger, and then flows back to the liquid cooling medium channel of the main circulating pump to form circulation.
9. The method of claim 8, wherein the operating conditions of the cooling mode are: the ambient temperature is more than or equal to 30 ℃;
The operating conditions of the self-circulation mode are: the ambient temperature is more than or equal to 0 ℃ and less than 30 ℃;
The operation conditions of the heating mode are as follows: the ambient temperature is less than 0 ℃.
10. The method according to claim 8, wherein the first three-way valve and the second three-way valve of the liquid cooling unit for an energy storage system;
the first three-way valve and the second three-way valve comprise an a port, a b port and a c port which are controlled by an upper computer to be opened/closed;
After the liquid cooling medium channel of the main circulating pump is sequentially communicated with the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the port a of the second three-way valve are in shunt communication, the liquid cooling medium channel of the second heat exchanger is communicated with the port a of the first three-way valve, the port b of the second three-way valve is communicated with the liquid cooling medium channel of the first heat exchanger, the port c of the first three-way valve is communicated with the port c of the second three-way valve, and after the liquid cooling medium channel of the first heat exchanger and the port b of the first three-way valve are converged, the liquid cooling medium channel of the first heat exchanger is communicated with the liquid cooling medium channel of the main circulating pump;
When entering the refrigeration mode or the self-circulation mode: the port a and the port b of the first three-way valve are opened, the port c of the first three-way valve is closed, the port a and the port b of the second three-way valve are opened, and the port c of the second three-way valve is closed, so that a liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump and the liquid cooling medium channel of the radiator, is split into the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger, and is converged to the liquid cooling medium channel of the main circulating pump from the liquid cooling medium channel of the first heat exchanger and the liquid cooling medium channel of the second heat exchanger to form circulation;
When entering the heating mode: the port a and the port c of the first three-way valve are opened, the port b of the first three-way valve is closed, the port b and the port c of the second three-way valve are opened, and the port a of the second three-way valve is closed, so that a liquid cooling medium sequentially passes through the liquid cooling medium channel of the main circulating pump, the liquid cooling medium channel of the radiator, the liquid cooling medium channel of the second heat exchanger and the liquid cooling medium channel of the first heat exchanger and then flows back to the liquid cooling medium channel of the main circulating pump to form circulation.
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| CN119292378A (en) * | 2024-12-16 | 2025-01-10 | 四川川润液压润滑设备有限公司 | Energy storage temperature control system and control method |
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