CN114447470B - Integrated cooling system of energy storage battery and control method - Google Patents

Integrated cooling system of energy storage battery and control method Download PDF

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Publication number
CN114447470B
CN114447470B CN202111594394.4A CN202111594394A CN114447470B CN 114447470 B CN114447470 B CN 114447470B CN 202111594394 A CN202111594394 A CN 202111594394A CN 114447470 B CN114447470 B CN 114447470B
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energy storage
liquid cooling
liquid
storage battery
cooling system
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CN114447470A (en
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崔鹏飞
关胜利
周硕
沈新月
吴安兵
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Guangzhou Goaland Energy Conservation Tech Co Ltd
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Guangzhou Goaland Energy Conservation Tech Co Ltd
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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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
    • H05K7/20263—Heat dissipaters releasing heat from coolant
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
    • H05K7/20272—Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20309—Evaporators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20927—Liquid coolant without phase change
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20936—Liquid coolant with phase change
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20945—Thermal management, e.g. inverter temperature control
    • 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)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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

An integrated cooling system and control method for an energy storage battery, the system comprises: a liquid cooling loop, a refrigerating loop and an evaporator; the liquid cooling loop and the refrigerating loop are connected in parallel through an evaporator; the cooling system cools the inverter cabinets and the energy storage battery clusters with different rated operating temperatures at the same time; the evaporator comprises a cooling medium branch and a refrigerant body branch; the cooling medium branch is connected in series in the liquid cooling loop, and the refrigerant body branch is connected in series in the refrigeration loop; the cooling medium flows in the cooling medium pipeline, and the cooling medium flows in the refrigerant body branch; in the evaporator, after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium realizes cooling through heat release, and the refrigerant body realizes the change from low-temperature low-pressure liquid to low-temperature low-pressure gas through heat absorption; through cooperative control, the cooling resources are fully used, and the same liquid cooling loop and refrigeration loop are used for meeting the constant-temperature operation of the energy storage battery cluster and the operation temperature requirement of the inverter cabinet, so that the energy storage equipment can reliably, safely and stably operate.

Description

Integrated cooling system of energy storage battery and control method
Technical Field
The invention relates to the technical field of energy storage power station cooling equipment, in particular to an integrated cooling system of an energy storage battery and a control method.
Background
In order to realize the great strategic measures of carbon peak and carbon neutralization, the energy conservation and emission reduction are promoted, the comprehensive utilization of resources is enhanced, the total energy consumption is reasonably controlled, the energy utilization efficiency is greatly improved, and the safe and stable operation of the energy storage system is extremely important.
Loss caused by thermal runaway of the energy storage battery is immeasurable, and in the prior art, the cooling of the energy storage battery adopts an air cooling mode. The air is directly introduced as a heat transfer medium, so that the air flows through the module to achieve the aim of heat dissipation, and generally, components such as a fan, an inlet and outlet air duct and the like are needed, an independent system is needed to be established to provide a heating or cooling function, and the air is independently controlled according to the battery state, so that the energy consumption and the cost of the whole vehicle are increased.
The working mechanism of the air-cooled internal circulation system is as follows: a fan arranged in the cabinet body provides a wind pressure head and wind quantity for internal circulation; axial flow fans are generally adopted, and the fans are characterized by larger air quantity but smaller pressure head. Considering the spatial arrangement of other devices in the cabinet, the air flow of the internal circulation is difficult to be organized properly, and the problems of poor internal circulation effect and uneven heat dissipation exist; and after the internal circulation is organized, if the internal structure of the cabinet is changed, the original internal circulation is seriously influenced, namely the internal circulation is greatly influenced by the internal structure of the cabinet. The disadvantage of this internal circulation results in very low wind speeds at some, even most, heat sources, only 1m/s to 2m/s, and low wind speeds prevent the direction of air flow at the heat source from maximizing the heat dissipation. In addition, in the existing air cooling system, the cooling air which completes heat exchange through the heat exchanger is dispersed into the environment, the environment is heated, so that the cooling air of the air cooling system can be mixed with the hot air in the flowing process, the cooling air which originally needs to be heated at a low temperature is heated, the cooling efficiency of the energy storage battery is reduced, and meanwhile, the requirement of constant-temperature operation of the battery cluster is difficult to meet due to the instability of the temperature of the cooling medium.
Prior art 1 (CN 107444103B) "an integrated thermal management system for electric vehicles", including a battery integrated thermal management system, a motor integrated thermal management system, and a refrigeration and heating cycle system of a heat pump air conditioner; the battery integrated thermal management system comprises a first water pump, a first phase change heat exchanger, a first expansion kettle and a battery water cooling coil; the motor integrated heat management system comprises a second water pump, a second phase change heat exchanger, a second expansion kettle, a radiator and a first motor water cooling coil; the refrigerating and heating circulation system of the heat pump air conditioner comprises a condenser, the heat pump air conditioner, an evaporator and a dryer. The battery integrated heat management system and the motor integrated heat management system are connected with the heat pump air conditioner refrigerating cycle and the heating cycle system through the phase-change heat exchanger, when the heating cycle is performed, the phase-change heat exchanger transfers energy storage to the evaporator for preheating, and when the refrigerating cycle is performed, the evaporator transfers heat to the phase-change heat exchanger for energy storage. In the prior art 1, as the phase-change heat exchanger is adopted, the characteristics of high phase-change latent heat and heat conductivity of the phase-change material are fully exerted, so that the number of evaporators is reduced, the volume in the vehicle is enlarged, and the structural layout in the vehicle is reasonable. However, in the prior art 1, not only the two heat exchangers are filled with the phase-change material, but also the corresponding branch pipes are filled with the phase-change material, so that durability and economical efficiency are required to be improved in the use process, firstly, the thermal physical properties of the phase-change material are degraded in the cyclic phase-change process, secondly, the phase-change material leaks out of the matrix material to form frosting on the surface of the material, and furthermore, the matrix material is easily damaged due to stress generated in the phase-change process. In addition, the large amount of phase change materials are used, so that the engineering cost of the cooling system is obviously improved, and the initial investment and the maintenance cost are high when the phase change materials are used in the high-power energy storage battery cooling system from the aspect of the engineering life cycle.
In addition, if the liquid is used as a medium to conduct heat transfer and cooling to the energy storage battery, a heat transfer channel, such as a water jacket, needs to be established between the module and the liquid medium to indirectly heat and cool in a convection and heat conduction mode, and the heat transfer medium can be water, glycol or even refrigerant, so that the structure is too huge and complex due to the requirement of a fan, a water pump, a heat exchanger, a heater, a pipeline and other accessories, and meanwhile, the energy of the battery is consumed, and the power density and the energy density of the battery are reduced. Although the liquid cooling system has mature technology and accurate temperature control, and can meet the technical requirements of accurate temperature control, constant temperature operation and the like of the energy storage battery, the liquid cooling system cannot be designed with the energy storage battery in an integrated mode due to a complex heat exchange structure and a complex medium channel.
Therefore, a cooling system capable of being integrated with an energy storage battery needs to be studied, and the accurate temperature control and constant temperature operation of the energy storage battery are met.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an integrated cooling system for an energy storage battery and a control method.
The invention adopts the following technical scheme.
An integrated cooling system for an energy storage battery is used for cooling an inverter cabinet and an energy storage battery cluster in the energy storage battery system.
A cooling system is integrated in the energy storage battery system, the cooling system comprising: a liquid cooling loop, a refrigerating loop and an evaporator; wherein, the liquid cooling loop and the refrigerating loop are arranged in parallel through the evaporator; the cooling system is used for cooling the inverter cabinet and the energy storage battery cluster at the same time, wherein rated operating temperatures of the inverter cabinet and the energy storage battery cluster are different;
The evaporator comprises a cooling medium branch and a refrigerant body branch; the cooling medium branch is connected in series in the liquid cooling loop, and the refrigerant body branch is connected in series in the refrigeration loop; the cooling medium flows in the cooling medium pipeline, the cooling medium flows in the refrigerant body branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
In the evaporator, after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium realizes cooling through heat release, and the refrigerant body realizes the change from low-temperature low-pressure liquid to low-temperature low-pressure gas through heat absorption;
wherein the cooling medium is a liquid.
The liquid cooling loop comprises: the device comprises a main circulating pump, a cooled piece liquid cooling inlet end, a cooled piece liquid cooling outlet end, a first cooling medium pipeline, a second cooling medium pipeline and a third cooling medium pipeline;
In the liquid cooling loop, the cooling medium flows out of the main circulating pump and flows into the evaporator through the first cooling medium pipeline; in the cooling medium branch of the evaporator, after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium flows into the liquid cooling inlet end of the cooled piece through the second cooling medium pipeline; in the cooled member, the cooling medium performs the second heat exchange with the cooled member, and then flows out from the liquid cooling outlet end of the cooled member, and flows into the main circulation pump through the third cooling medium pipe.
The refrigeration circuit includes: the device comprises a compressor, a condenser, a throttle valve and a refrigerant body pipeline;
In the refrigeration loop, the refrigerant body flows into the evaporator, and in the refrigerant body branch of the evaporator, after the first heat exchange between the refrigerant medium and the cooling medium, the refrigerant body flows into the compressor, the condenser and the throttle valve in sequence through the refrigerant medium pipeline.
In the refrigeration loop, the refrigerant body flowing into the evaporator is low-temperature low-pressure liquid, and the refrigerant body flowing out of the evaporator is low-temperature low-pressure gas; the compressor compresses low-temperature low-pressure gas to obtain high-temperature high-pressure gas; in the condenser, the high-temperature high-pressure gas is condensed into medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid forms low-temperature low-pressure liquid at the throttle valve.
The refrigeration loop also comprises a gas-liquid separator and a gas-liquid filter;
the refrigerant body flowing out of the evaporator firstly enters a gas-liquid separator to realize gas-liquid separation in low-temperature low-pressure gas; the low-temperature low-pressure gas after gas-liquid separation enters the compressor again;
the refrigerant flowing out of the condenser firstly enters a gas-liquid filter to realize gas-liquid filtration in medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid after gas-liquid filtration enters the throttle valve.
A filter is connected in series on a first cooling medium pipeline connected with the outlet end of the main circulating pump and the inlet end of the evaporator;
A heater is connected in series in sequence on a second cooling medium pipeline which is connected with the outlet end of the evaporator and the liquid cooling inlet end of the cooled piece; and a third cooling medium pipeline connected with the liquid cooling outlet end of the cooled piece and the inlet end of the main circulating pump is connected in parallel with the high-level water tank.
After flowing into the liquid cooling inlet end of the cooling piece, the cooling medium sequentially passes through the liquid cooling pipeline and the first liquid cooling branch circuit to reach the liquid cooling system inlet end of the inverter cabinet, and sequentially passes through the liquid cooling pipeline and the second liquid cooling branch circuit to reach the liquid cooling system outlet end of the energy storage battery cluster;
a third ball valve is connected in series on the liquid cooling pipeline; the second liquid cooling branch is connected with a first ball valve in series;
the outlet end of the liquid cooling system of the inverter cabinet is connected with the liquid cooling outlet end of the cooling piece through a third liquid cooling branch;
The inlet end of the liquid cooling system of the energy storage battery cluster is connected with the liquid cooling inlet end of the cooled piece through a fourth liquid cooling branch;
the second liquid cooling branch is also connected with the liquid cooling outlet end of the cooled piece through a fifth liquid cooling branch, and a connection point A of the fifth liquid cooling branch connected to the second liquid cooling branch is positioned between the first ball valve and the liquid cooling system outlet end of the energy storage battery cluster; wherein, the second ball valve is connected in series on the fifth liquid cooling branch.
A first inlet pressure gauge is arranged on the first cooling medium pipeline between the main circulating pump and the filter;
a first thermometer and a first outlet pressure gauge are arranged between the heater and the liquid cooling inlet end of the cooled piece on the second cooling medium pipeline;
A second thermometer and a second outlet pressure gauge are arranged on the second liquid cooling branch and between a connection point A of the fifth liquid cooling branch connected to the second liquid cooling branch and the outlet end of the liquid cooling system of the energy storage battery cluster;
And a third thermometer and a third outlet pressure gauge are arranged between the liquid cooling outlet end of the cooled piece and the connecting point of the high-level water tank connected to the third cooling medium pipeline on the third cooling medium pipeline.
A second inlet pressure gauge and a fourth thermometer are arranged on a refrigerant body pipeline between the condenser and the gas-liquid filter;
and a fifth thermometer and a fourth outlet pressure gauge are arranged on a refrigerant body pipeline between the evaporator and the gas-liquid separator.
The high-level water tank is provided with a liquid level meter.
The cooling system further includes: an upper computer; the host computer includes: the signal acquisition module and the control module;
the signal acquisition module is used for acquiring temperature signals, pressure signals, flow signals, liquid level signals and heater power signals by using instruments and sensors; wherein,
The temperature signal includes: the inlet temperature of the liquid cooling system of the cooled piece, the outlet temperature of the liquid cooling system of the energy storage battery cluster, the outlet temperature of the condenser and the inlet temperature of the compressor;
the pressure signal includes: the inlet pressure of the liquid cooling system of the cooled piece, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of the compressor, the outlet pressure of the main circulating pump and the outlet pressure of the condenser;
the flow signal is the flow of the liquid cooling loop;
the liquid level signal is a liquid level signal of the high-level water tank;
The heater power signal is the input power of the heater;
And the control module is used for controlling the start, stop and protection of the compressor, the fan of the condenser and the heater by utilizing the PLC.
The control method of the integrated cooling system of the energy storage battery comprises the following steps:
step 1, collecting the operation temperature of an energy storage battery cluster and the operation temperature of an inverter cabinet; when the operating temperature of the energy storage battery cluster and/or the operating temperature of the inverter cabinet are/is greater than the starting temperature limit value of the cooling system, the cooling system is electrified and started; the cooling system starting temperature limit value is the minimum value of the rated operating temperature of the energy storage battery cluster and the rated operating temperature of the inverter cabinet;
Step 2, the main circulating pump in the liquid cooling loop is electrified and started, and the cooling system operates in a self-circulation uniform temperature mode;
Step 3, collecting the inlet temperature of a liquid cooling system of the cooled piece; when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting a refrigeration loop, and entering a step 4; when the operation temperature of the energy storage battery cluster and the operation temperature of the inverter cabinet are not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, and the step 2 is returned;
Step 4, after the refrigeration loop is started, collecting the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system; and controlling the first ball valve and the second ball valve according to the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system, and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system.
Preferably, in step 2, in the self-circulation temperature equalization mode, the refrigeration system is not started, i.e. the compressor is not started, and the fan of the condenser is not started; in the self-circulation temperature equalization mode, a heater in the cooling system is not started, and the cooling medium sequentially passes through the main circulation pump, the filter, the heater and the liquid cooling system of the cooled piece and then returns to the main circulation pump;
in the self-circulation temperature equalization mode, the cooling system is operated for not less than 2 minutes.
Preferably, step 3 comprises:
Step 3.1, when the operation temperature of the energy storage battery cluster is not more than the inlet temperature of the liquid cooling system of the cooled piece and the operation temperature of the inverter cabinet is not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, namely, fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop circulates automatically; at this time, the operating temperature range of the energy storage battery cluster is 20-25 ℃, and the operating temperature of the inverter cabinet is 40 ℃;
Step 3.2, when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting the refrigeration loop, namely starting a fan of the condenser, and starting the compressor after the fan is operated for 30 seconds; during the start-up of the refrigeration circuit, the main circulation pump remains in operation.
Preferably, step 3.1 further comprises: when the operating temperature of the energy storage battery cluster is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not greater than the starting temperature limit value of the cooling system, the cooling system is powered off and stops operating.
Preferably, step 4 comprises:
Step 4.1, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system does not exceed the limit value, the second ball valve and the third ball valve are closed, the first ball valve is opened, at the moment, a cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then sequentially enters the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a serial connection mode, namely, the inverter cabinet is cooled again by using cooling liquid after the energy storage battery cluster is cooled;
Step 4.2, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system exceeds the limit value, the second ball valve and the third ball valve both open the channel, and the first ball valve closes the channel, at this time, after the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling medium sequentially enters the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a parallel connection mode.
Preferably, the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system are respectively collected by using a flowmeter, and when the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system are the same, the first ball valve opens the channel, and the second ball valve closes the channel.
The invention has the beneficial effects that compared with the prior art:
According to the cooling system and the control method thereof, the refrigerating loop is adopted to replace an air cooling device or a cooling tower, and the liquid cooling loop and the refrigerating loop are connected in parallel by using the evaporator so as to realize the cooling of a cooling medium by a cooling medium; the cooling system with the structure can cool a plurality of devices such as the inverter cabinet and the energy storage battery cluster at the same time under the condition of using the same liquid cooling loop and the refrigerating loop, so as to meet the requirement difference of cooling temperature difference caused by different rated operating temperatures of the plurality of devices such as the inverter cabinet and the energy storage battery cluster.
The beneficial effects of the invention are as follows:
1) The air cooling device or the cooling tower is omitted, and the requirements of different cooling temperature differences of all equipment are met only by using the same liquid cooling loop and the same refrigerating loop, so that the liquid cooling loop and the refrigerating loop are miniaturized in structure, can be integrated in a single cabinet body, effectively reduces occupied area and space size, and provides technical support for the integration of a cooling system and an energy storage battery system;
2) Because the operating temperature of the battery cluster is about 20-25 ℃, the operating temperature of the inverter cabinet is about 40 ℃, and the operating temperatures of the battery cluster and the inverter cabinet are different, when the same liquid cooling loop and the refrigeration loop are used for cooling, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system does not exceed the limit value, a cooling medium sequentially enters the energy storage battery cluster liquid cooling system through a fourth liquid cooling branch and then sequentially enters the inverter cabinet liquid cooling system through a second liquid cooling branch and a first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a serial connection mode; the inverter cabinet is cooled again by using the cooling liquid after cooling the battery clusters, so that the cooling medium resources are fully utilized, and the utilization rate and the working efficiency of a cooling system are improved; when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system exceeds the limit value, the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then enters the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a parallel connection mode, and meanwhile, the operating temperature requirements of the two devices are met;
2) The main circulating pump in the liquid cooling loop is a shielding pump, and compared with a dynamic seal used by a mechanical centrifugal pump, the shielding pump is easier to realize complete seal, can realize complete leak-free, has long service life and easy installation, can realize maintenance-free, and meanwhile, has low noise of the shielding pump and can not cause acoustic pollution to the surrounding environment;
3) The cooling system precisely controls the difference value of the inlet temperature of the liquid cooling system of the cooled piece within the range of +/-2 ℃ by controlling the refrigerating loop;
4) On the premise that a pipeline system in the liquid cooling system of the cooled piece is kept unchanged, the inlet pressure and the inlet flow of the liquid cooling system of the cooled piece are accurately controlled by adjusting a pressure manual valve or a flow manual valve in the cooling system.
Drawings
FIG. 1 is a schematic diagram of an integrated cooling system for an energy storage battery according to the present invention;
The reference numerals in fig. 1 are explained as follows:
1-a main circulation pump;
2-a filter;
3-an evaporator;
4-an inverter cabinet;
5-energy storage battery clusters;
6-a gas-liquid separator;
7-a compressor;
8-a condenser containing a fan;
9-a throttle valve;
10-a liquid level meter;
11-outlet pressure gauge, wherein 11-1 is a first outlet pressure gauge and 11-2 is a second outlet pressure gauge;
12-thermometer, wherein 12-1 is the first thermometer, 12-2 is the second thermometer, 12-3 is the third thermometer, 12-4 is the fourth thermometer, 12-5 is the fifth thermometer;
13-inlet pressure gauge, wherein 13-1 is a first inlet pressure gauge, 13-2 is a second inlet pressure gauge, 13-3 is a third inlet pressure gauge, and 13-4 is a fourth inlet pressure gauge;
14-high level water tank;
15-a heater;
16-a gas-liquid filter;
17-a first ball valve; 18-a second ball valve; 19-a third ball valve;
20-a first cooling medium conduit; 21-a second cooling medium conduit; 22-a third cooling medium duct; 23-refrigerant body piping;
100-a liquid cooling inlet end of a cooled piece; 200-a liquid cooling outlet end of the cooled piece;
4 a-an inlet end of the liquid cooling system of the inverter cabinet; 4 b-an outlet end of the liquid cooling system of the inverter cabinet;
5 a-an inlet end of the energy storage battery cluster liquid cooling system; 5 b-an outlet end of the energy storage battery cluster liquid cooling system;
FIG. 2 is a schematic view of the appearance of a cooling system cabinet according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of an energy storage system container in which a cooling system cabinet is integrated in an embodiment of the invention;
Fig. 4 is a block diagram illustrating steps of a method for controlling an integrated cooling system for an energy storage battery according to the present invention.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in fig. 1, an integrated cooling system for an energy storage battery is used for cooling an inverter cabinet 4 and an energy storage battery cluster 5 in the energy storage battery system; in a preferred embodiment of the invention, the cooling system is integrated in a single cabinet, as shown in fig. 2, which may be integrated in an energy storage system container as shown in fig. 3.
A cooling system is integrated in the energy storage battery system, the cooling system comprising: a liquid cooling loop, a refrigerating loop and an evaporator; wherein the liquid cooling loop and the refrigerating loop are arranged in parallel through the evaporator 3; the cooling system is used for cooling the inverter cabinet and the energy storage battery cluster at the same time, wherein rated operating temperatures of the inverter cabinet and the energy storage battery cluster are different;
The evaporator 3 comprises a cooling medium branch and a refrigerant body branch; the cooling medium branch is connected in series in the liquid cooling loop, and the refrigerant body branch is connected in series in the refrigeration loop; the cooling medium flows in the cooling medium pipeline, the cooling medium flows in the refrigerant body branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
In the evaporator 3, after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium cools by releasing heat, and the refrigerant body changes from low-temperature low-pressure liquid into low-temperature low-pressure gas by absorbing heat;
wherein the cooling medium is a liquid.
The liquid cooling loop comprises: a main circulation pump 1, a cooled member liquid cooling inlet port 100, a cooled member liquid cooling outlet port 200, a first cooling medium pipe 20, a second cooling medium pipe 21, and a third cooling medium pipe 22;
In the liquid cooling circuit, the cooling medium flows out of the main circulation pump 1 and then flows into the evaporator 3 through the first cooling medium pipe 20; in the cooling medium branch of the evaporator 3, the cooling medium exchanges heat with the refrigerant body for the first time, and then flows into the liquid cooling inlet end 100 of the cooled member through the second cooling medium pipe 21; in the cooling target, the cooling medium performs the second heat exchange with the cooling target, and then flows out of the cooling target liquid cooling outlet port 200, flows into the main circulation pump 1 through the third cooling medium pipe 22, and circulates in this way to form a liquid cooling circuit.
The refrigeration circuit includes: a compressor 7, a condenser 8, a throttle valve 9, and a refrigerant pipe 23;
in the refrigeration circuit, the refrigerant flows into the evaporator 3, and after the first heat exchange between the refrigerant and the cooling medium in the refrigerant branch of the evaporator 3, the refrigerant flows into the compressor 7, the condenser 8 and the throttle valve 9 in this order through the refrigerant pipe 23.
In the refrigeration circuit, the cold medium flowing into the evaporator 3 is low-temperature low-pressure liquid, and the cold medium flowing out of the evaporator 3 is low-temperature low-pressure gas; the compressor 7 compresses low-temperature low-pressure gas to obtain high-temperature high-pressure gas; in the condenser 8, the high-temperature and high-pressure gas is condensed into a medium-temperature and high-pressure liquid; the medium-temperature high-pressure liquid forms a low-temperature low-pressure liquid at the throttle valve 9, thus forming a refrigeration circuit.
The refrigeration circuit also comprises a gas-liquid separator 6 and a gas-liquid filter 16;
The refrigerant flowing out of the evaporator 3 firstly enters the gas-liquid separator 6 to realize gas-liquid separation in low-temperature low-pressure gas; the low-temperature low-pressure gas subjected to gas-liquid separation enters the compressor 7 again;
The refrigerant flowing out of the condenser 8 firstly enters the gas-liquid filter 16 to realize gas-liquid filtration in medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid subjected to gas-liquid filtration enters the throttle valve 9 again.
A filter 2 is connected in series on a first cooling medium pipeline 20 which is connected with the outlet end of the main circulating pump 1 and the inlet end of the evaporator 3;
A heater 15 is connected in series in sequence on a second cooling medium pipeline 21 connecting the outlet end of the evaporator 3 and the liquid cooling inlet end 100 of the cooled piece; a third cooling medium pipe 22 connecting the liquid cooling outlet end 200 of the cooled piece and the inlet end of the main circulating pump 1 is connected in parallel with the head tank 14.
After flowing into the cooling member liquid cooling inlet end 100, the cooling medium sequentially passes through the liquid cooling pipeline 30 and the first liquid cooling branch 31 to reach the liquid cooling system inlet end 4a of the inverter cabinet 4, and sequentially passes through the liquid cooling pipeline 30 and the second liquid cooling branch 32 to reach the liquid cooling system outlet end 5b of the energy storage battery cluster 5;
the liquid cooling pipeline 30 is connected with a third ball valve 19 in series; the second liquid cooling branch 32 is connected with a first ball valve 17 in series;
The outlet end 4b of the liquid cooling system of the inverter cabinet 4 is connected with the liquid cooling outlet end 200 of the cooling piece through a third liquid cooling branch 33;
the inlet end 5a of the liquid cooling system of the energy storage battery cluster 5 is connected with the liquid cooling inlet end 100 of the cooled piece through a fourth liquid cooling branch 34;
The second liquid cooling branch 32 is further connected with the liquid cooling outlet end 200 of the cooled member through a fifth liquid cooling branch 35, and a connection point a of the fifth liquid cooling branch 35 to the second liquid cooling branch 32 is located between the first ball valve 17 and the liquid cooling system outlet end 5b of the energy storage battery cluster 5; wherein the fifth liquid cooling branch 35 is connected with the second ball valve 18 in series.
A first inlet pressure gauge 11-1 is installed on the first cooling medium pipe 20 between the main circulation pump 1 and the filter 2;
A second cooling medium pipe 21 is provided with a first thermometer 12-1 and a first outlet pressure gauge 13-1 between the heater 15 and the liquid cooling inlet end 100 of the cooled member;
A second thermometer 12-2 and a second outlet pressure gauge 13-2 are arranged between a connection point A of the fifth liquid cooling branch 35 connected to the second liquid cooling branch 32 and the outlet end 5b of the liquid cooling system of the energy storage battery cluster 5 on the second liquid cooling branch 32;
On the third cooling medium pipeline 22, a third thermometer 12-3 and a third outlet pressure gauge 13-3 are arranged between the liquid cooling outlet end 200 of the cooled piece and the connecting point of the high-level water tank 14 connected into the third cooling medium pipeline 22.
A second inlet pressure gauge 11-2 and a fourth thermometer 12-4 are arranged on a refrigerant body pipeline 23 between the condenser 8 and the gas-liquid filter 16;
a fifth thermometer 12-5 and a fourth outlet pressure gauge 13-4 are arranged on a refrigerant body pipeline 23 between the evaporator 3 and the gas-liquid separator 6.
The head tank 14 has a level gauge 10 mounted thereon.
The cooling system further includes: an upper computer; the host computer includes: the signal acquisition module and the control module;
the signal acquisition module is used for acquiring temperature signals, pressure signals, flow signals, liquid level signals and heater power signals by using instruments and sensors; wherein,
The temperature signal includes: the inlet temperature of the liquid cooling system of the cooled piece, the outlet temperature of the liquid cooling system of the energy storage battery cluster, the outlet temperature of the condenser and the inlet temperature of the compressor;
the pressure signal includes: the inlet pressure of the liquid cooling system of the cooled piece, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of the compressor, the outlet pressure of the main circulating pump and the outlet pressure of the condenser;
the flow signal is the flow of the liquid cooling loop;
the liquid level signal is a liquid level signal of the high-level water tank;
The heater power signal is the input power of the heater;
and the control module is used for controlling the start, stop and protection of the compressor 7, the fan of the condenser 8 and the heater 15 by utilizing the PLC.
In the preferred embodiment of the invention, the liquid cooling unit is a relatively complex system, the monitoring of the unit parameters is not only the premise of ensuring the normal operation of the liquid cooling unit, but also the control basis of the automatic operation of the unit, the sensor is arranged in the system, the acquisition module of the PLC is used for acquiring the signals including the temperature signal, the pressure signal, the flow signal and the liquid level signal, the signals of the state of a thermal relay and the like for protecting motor equipment are also acquired, and the perfect acquisition sensor lays a foundation for the good operation of the unit. The control system completes the start, stop and protection of the compressor, the fan, the liquid supply pump, the electric heating equipment and the like according to the control requirement and the working logic of the system. The control of the liquid cooling unit is completed by taking a PLC as a core, the unit enters an automatic operation state according to a self control strategy after receiving a starting instruction, the unit can ensure the automatic control of the liquid supply temperature, and the pressure and the flow can ensure the state after the last adjustment when the position of a valve is unchanged.
When the controller breaks down, can use emergent manual operation, put the selection switch on the electric cabinet door plant "emergent manual" position, automatically open the forced air cooling water valve this moment, automatically close the refrigeration water valve, then open "water pump manual button" protective cover, press the button, then the water pump forced-operation, shield all trouble that influences the water pump work, as long as do not trip, the water pump just keeps running, open "fan manual button" protective cover, press the button, then the fan forced-operation, shield all trouble that influences the fan work, as long as do not trip, the fan just keeps running, realize emergent start-up function.
As shown in fig. 4, a control method of an integrated cooling system of an energy storage battery includes:
step 1, collecting the operation temperature of an energy storage battery cluster and the operation temperature of an inverter cabinet; when the operating temperature of the energy storage battery cluster and/or the operating temperature of the inverter cabinet are/is greater than the starting temperature limit value of the cooling system, the cooling system is electrified and started; the cooling system starting temperature limit value is the minimum value of the rated operating temperature of the energy storage battery cluster and the rated operating temperature of the inverter cabinet;
Step 2, the main circulating pump in the liquid cooling loop is electrified and started, and the cooling system operates in a self-circulation uniform temperature mode;
Specifically, in step 2, in the self-circulation temperature equalization mode, the refrigeration system is not started, i.e. the compressor is not started, and the fan of the condenser is not started; in the self-circulation temperature equalization mode, a heater in the cooling system is not started, and the cooling medium sequentially passes through the main circulation pump, the filter, the heater and the liquid cooling system of the cooled piece and then returns to the main circulation pump;
in the self-circulation temperature equalization mode, the cooling system is operated for not less than 2 minutes.
Step 3, collecting the inlet temperature of a liquid cooling system of the cooled piece; when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting a refrigeration loop, and entering a step 4; when the operation temperature of the energy storage battery cluster and the operation temperature of the inverter cabinet are not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, and the step 2 is returned;
Specifically, step 3 includes:
Step 3.1, when the operation temperature of the energy storage battery cluster is not more than the inlet temperature of the liquid cooling system of the cooled piece and the operation temperature of the inverter cabinet is not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, namely, fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop circulates automatically; at this time, the operating temperature range of the energy storage battery cluster is 20-25 ℃, and the operating temperature of the inverter cabinet is 40 ℃;
Further, step 3.1 further comprises: when the operating temperature of the energy storage battery cluster is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not greater than the starting temperature limit value of the cooling system, the cooling system is powered off and stops operating.
Step 3.2, when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting the refrigeration loop, namely starting a fan of the condenser, and starting the compressor after the fan is operated for 30 seconds; during the start-up of the refrigeration circuit, the main circulation pump remains in operation.
Step 4, after the refrigeration loop is started, collecting the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system; and controlling the first ball valve and the second ball valve according to the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system, and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system.
Specifically, step 4 includes:
Step 4.1, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system does not exceed the limit value, the second ball valve and the third ball valve are closed, the first ball valve is opened, at the moment, a cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then sequentially enters the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a serial connection mode, namely, the inverter cabinet is cooled again by using cooling liquid after the energy storage battery cluster is cooled;
Step 4.2, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system exceeds the limit value, the second ball valve and the third ball valve both open the channel, and the first ball valve closes the channel, at this time, after the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling medium sequentially enters the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a parallel connection mode.
Further, the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system are respectively collected by using the flow meter, and when the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system are the same, the first ball valve opens the channel, and the second ball valve closes the channel.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.

Claims (13)

1. An integrated cooling system of energy storage batteries is used for cooling an inverter cabinet (4) and an energy storage battery cluster (5) in the energy storage battery system; it is characterized in that the method comprises the steps of,
A cooling system is integrated in the energy storage battery system, the cooling system comprising: a liquid cooling loop, a refrigerating loop and an evaporator; wherein the liquid cooling loop and the refrigerating loop are arranged in parallel through the evaporator (3); the cooling system is used for cooling the inverter cabinet and the energy storage battery cluster at the same time, wherein rated operating temperatures of the inverter cabinet and the energy storage battery cluster are different;
The evaporator (3) comprises a cooling medium branch and a refrigerant body branch; the cooling medium branch is connected in series in the liquid cooling loop, and the refrigerant body branch is connected in series in the refrigeration loop; the cooling medium flows in the cooling medium pipeline, the cooling medium flows in the refrigerant body branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
the liquid cooling loop comprises: a main circulation pump (1), a cooled member liquid cooling inlet end (100), a cooled member liquid cooling outlet end (200), a first cooling medium pipe (20), a second cooling medium pipe (21), and a third cooling medium pipe (22); in the liquid cooling loop, the cooling medium flows out of the main circulating pump (1) and then flows into the evaporator (3) through the first cooling medium pipeline (20); in the cooling medium branch of the evaporator (3), after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium flows into the liquid cooling inlet end (100) of the cooled piece through the second cooling medium pipeline (21); in the cooled piece, after the second heat exchange between the cooling medium and the cooled piece, the cooling medium flows out from the liquid cooling outlet end (200) of the cooled piece and flows into the main circulating pump (1) through the third cooling medium pipeline (22);
The refrigeration circuit includes: a compressor (7), a condenser (8), a throttle valve (9), a refrigerant pipe (23); in the refrigeration circuit, a refrigerant body flows into an evaporator (3), and after first heat exchange between a cooling medium and a cooling medium in a refrigerant body branch of the evaporator (3), the refrigerant body flows into a compressor (7), a condenser (8) and a throttle valve (9) in sequence through a refrigerant body pipeline (23);
After flowing into the liquid cooling inlet end (100) of the cooling piece, the cooling medium sequentially passes through the liquid cooling pipeline (30) and the first liquid cooling branch (31) to reach the liquid cooling system inlet end (4 a) of the inverter cabinet (4), and sequentially passes through the liquid cooling pipeline (30) and the second liquid cooling branch (32) to reach the liquid cooling system outlet end (5 b) of the energy storage battery cluster (5);
A third ball valve (19) is connected in series on the liquid cooling pipeline (30); the second liquid cooling branch (32) is connected with a first ball valve (17) in series; the outlet end (4 b) of the liquid cooling system of the inverter cabinet (4) is connected with the liquid cooling outlet end (200) of the cooling piece through a third liquid cooling branch (33); the inlet end (5 a) of the liquid cooling system of the energy storage battery cluster (5) is connected with the liquid cooling inlet end (100) of the cooled piece through a fourth liquid cooling branch (34); the second liquid cooling branch circuit (32) is also connected with the liquid cooling outlet end (200) of the cooled piece through a fifth liquid cooling branch circuit (35), and a connection point A of the fifth liquid cooling branch circuit (35) connected to the second liquid cooling branch circuit (32) is positioned between the first ball valve (17) and the liquid cooling system outlet end (5 b) of the energy storage battery cluster (5); wherein, the fifth liquid cooling branch (35) is connected with a second ball valve (18) in series;
in the evaporator (3), after the first heat exchange between the cooling medium and the refrigerant body, the cooling medium realizes cooling through heat release, and the refrigerant body realizes the change from low-temperature low-pressure liquid to low-temperature low-pressure gas through heat absorption;
wherein the cooling medium is a liquid;
when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system does not exceed the limit value, the second ball valve and the third ball valve close the channel, and the first ball valve opens the channel, at the moment, the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then sequentially enters the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a serial connection mode, namely, the inverter cabinet is cooled again by using cooling liquid after the energy storage battery cluster is cooled;
When the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system exceeds the limit value, the second ball valve and the third ball valve both open the channel, and the first ball valve closes the channel, at the moment, after the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling medium sequentially enters the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a parallel connection mode.
2. The integrated cooling system of an energy storage battery of claim 1, wherein,
In the refrigeration circuit, the refrigerant body flowing into the evaporator (3) is low-temperature low-pressure liquid, and the refrigerant body flowing out of the evaporator (3) is low-temperature low-pressure gas; the compressor (7) compresses low-temperature low-pressure gas to obtain high-temperature high-pressure gas; in the condenser (8), the high-temperature and high-pressure gas is condensed into medium-temperature and high-pressure liquid; the medium-temperature high-pressure liquid forms low-temperature low-pressure liquid at the throttle valve (9).
3. The integrated cooling system of an energy storage battery of claim 2, wherein,
The refrigeration loop also comprises a gas-liquid separator (6) and a gas-liquid filter (16);
the refrigerant flowing out of the evaporator (3) firstly enters a gas-liquid separator (6) to realize gas-liquid separation in low-temperature low-pressure gas; the low-temperature low-pressure gas after gas-liquid separation enters a compressor (7);
The refrigerant flowing out of the condenser (8) firstly enters a gas-liquid filter (16) to realize gas-liquid filtration in medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid which is filtered by the gas-liquid enters a throttle valve (9).
4. The integrated cooling system of an energy storage battery of claim 1, wherein,
The filter (2) is connected in series on a first cooling medium pipeline (20) which is connected with the outlet end of the main circulating pump (1) and the inlet end of the evaporator (3);
A second cooling medium pipeline (21) for connecting the outlet end of the evaporator (3) and the liquid cooling inlet end (100) of the cooled piece is sequentially connected with a heater (15) in series; and a third cooling medium pipeline (22) connected with the liquid cooling outlet end (200) of the cooled piece and the inlet end of the main circulating pump (1) is connected in parallel with the high-level water tank (14).
5. The integrated cooling system of an energy storage battery of claim 4,
A first inlet pressure gauge (11-1) is arranged on the first cooling medium pipeline (20) between the main circulating pump (1) and the filter (2);
a first thermometer (12-1) and a first outlet pressure gauge (13-1) are arranged between the heater (15) and the liquid cooling inlet end (100) of the cooled piece on the second cooling medium pipeline (21);
A second thermometer (12-2) and a second outlet pressure gauge (13-2) are arranged between a connection point A of a fifth liquid cooling branch (35) connected to the second liquid cooling branch (32) and an outlet end (5 b) of a liquid cooling system of the energy storage battery cluster (5);
On the third cooling medium pipeline (22), a third thermometer (12-3) and a third outlet pressure gauge (13-3) are arranged between the liquid cooling outlet end (200) of the cooled piece and the connecting point of the high-level water tank (14) connected to the third cooling medium pipeline (22).
6. The integrated cooling system for an energy storage battery of any of claims 1 to 5,
A second inlet pressure gauge (11-2) and a fourth thermometer (12-4) are arranged on a refrigerant body pipeline (23) between the condenser (8) and the gas-liquid filter (16);
A fifth thermometer (12-5) and a fourth outlet pressure gauge (13-4) are arranged on a refrigerant body pipeline (23) between the evaporator (3) and the gas-liquid separator (6).
7. The integrated cooling system of an energy storage battery of claim 6, wherein,
A liquid level meter (10) is arranged on the high-level water tank (14).
8. The integrated cooling system of an energy storage battery of claim 1, wherein,
The cooling system further includes: an upper computer; the host computer includes: the signal acquisition module and the control module;
the signal acquisition module is used for acquiring temperature signals, pressure signals, flow signals, liquid level signals and heater power signals by using instruments and sensors; wherein,
The temperature signal includes: the inlet temperature of the liquid cooling system of the cooled piece, the outlet temperature of the liquid cooling system of the energy storage battery cluster, the outlet temperature of the condenser and the inlet temperature of the compressor;
the pressure signal includes: the inlet pressure of the liquid cooling system of the cooled piece, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of the compressor, the outlet pressure of the main circulating pump and the outlet pressure of the condenser;
the flow signal is the flow of the liquid cooling loop;
the liquid level signal is a liquid level signal of the high-level water tank;
The heater power signal is the input power of the heater;
And the control module is used for controlling the start, stop and protection of the compressor (7), the fan of the condenser (8) and the heater (15) by utilizing the PLC.
9. A control method suitable for an energy storage battery integrated cooling system according to any one of claim 1 to 8, characterized in that,
The control method comprises the following steps:
step 1, collecting the operation temperature of an energy storage battery cluster and the operation temperature of an inverter cabinet; when the operating temperature of the energy storage battery cluster and/or the operating temperature of the inverter cabinet are/is greater than the starting temperature limit value of the cooling system, the cooling system is electrified and started; the cooling system starting temperature limit value is the minimum value of the rated operating temperature of the energy storage battery cluster and the rated operating temperature of the inverter cabinet;
Step 2, the main circulating pump in the liquid cooling loop is electrified and started, and the cooling system operates in a self-circulation uniform temperature mode;
Step 3, collecting the inlet temperature of a liquid cooling system of the cooled piece; when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting a refrigeration loop, and entering a step 4; when the operation temperature of the energy storage battery cluster and the operation temperature of the inverter cabinet are not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, and the step 2 is returned;
Step 4, after the refrigeration loop is started, collecting the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system; controlling a first ball valve and a second ball valve according to the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system, and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system;
Step 4 comprises:
Step 4.1, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system does not exceed the limit value, the second ball valve and the third ball valve are closed, the first ball valve is opened, at the moment, a cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then sequentially enters the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch; the inverter cabinet and the energy storage battery cluster in the energy storage system are cooled in a serial connection mode, namely, the inverter cabinet is cooled again by using cooling liquid after the energy storage battery cluster is cooled;
Step 4.2, when the difference value between the outlet temperature of the energy storage battery cluster liquid cooling system and the inlet temperature of the inverter cabinet liquid cooling system exceeds the limit value, the second ball valve and the third ball valve both open the channel, and the first ball valve closes the channel, at this time, after the cooling medium sequentially enters the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling medium sequentially enters the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; and cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a parallel connection mode.
10. The method for controlling an integrated cooling system for an energy storage battery of claim 9,
In the step 2, under the self-circulation temperature equalization mode, the refrigerating system is not started, namely the compressor is not started, and the fan of the condenser is not started; in the self-circulation temperature equalization mode, a heater in the cooling system is not started, and the cooling medium sequentially passes through the main circulation pump, the filter, the heater and the liquid cooling system of the cooled piece and then returns to the main circulation pump;
in the self-circulation temperature equalization mode, the cooling system is operated for not less than 2 minutes.
11. The method for controlling an integrated cooling system for an energy storage battery of claim 9,
The step 3 comprises the following steps:
Step 3.1, when the operation temperature of the energy storage battery cluster is not more than the inlet temperature of the liquid cooling system of the cooled piece and the operation temperature of the inverter cabinet is not more than the inlet temperature of the liquid cooling system of the cooled piece, a refrigeration loop is not started, namely, fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop circulates automatically; at this time, the operating temperature range of the energy storage battery cluster is 20-25 ℃, and the operating temperature of the inverter cabinet is 40 ℃;
Step 3.2, when the operation temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled piece, starting the refrigeration loop, namely starting a fan of the condenser, and starting the compressor after the fan is operated for 30 seconds; during the start-up of the refrigeration circuit, the main circulation pump remains in operation.
12. The method for controlling an integrated cooling system for an energy storage battery of claim 11,
Step 3.1 further comprises: when the operating temperature of the energy storage battery cluster is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled piece, and the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not greater than the starting temperature limit value of the cooling system, the cooling system is powered off and stops operating.
13. The method for controlling an integrated cooling system for an energy storage battery of claim 9,
And respectively acquiring the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system by using a flowmeter, and closing the channel by using a second ball valve when the first ball valve is opened when the flow in the energy storage battery cluster liquid cooling system and the flow in the inverter cabinet liquid cooling system are the same.
CN202111594394.4A 2021-12-23 2021-12-23 Integrated cooling system of energy storage battery and control method Active CN114447470B (en)

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