CN114447470A - Integrated cooling system of energy storage battery and control method - Google Patents
Integrated cooling system of energy storage battery and control method Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 411
- 238000004146 energy storage Methods 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 346
- 239000002826 coolant Substances 0.000 claims abstract description 111
- 239000003507 refrigerant Substances 0.000 claims abstract description 50
- 238000005057 refrigeration Methods 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
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- 230000008569 process Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 4
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- 210000000352 storage cell Anatomy 0.000 claims 3
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- 238000010438 heat treatment Methods 0.000 description 6
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- 238000011217 control strategy Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
Abstract
An integrated cooling system and a control method for an energy storage battery are provided, the system comprises: a liquid cooling loop, a refrigeration loop and an evaporator; the liquid cooling loop and the refrigeration loop are connected in parallel through the evaporator; the cooling system simultaneously cools the inverter cabinet and the energy storage battery cluster with different rated operating temperatures; the evaporator comprises a cooling medium branch and a refrigerant body branch; the cooling medium branch is connected in the liquid cooling loop in series, and the refrigerant body branch is connected in the refrigeration loop in series; a cooling medium flows through the cooling medium pipeline, and a cooling medium flows through the refrigerant branch; in the evaporator, after the cooling medium and a refrigerant body carry out first heat exchange, the cooling medium realizes cooling through heat release, and the refrigerant body realizes changing from low-temperature low-pressure liquid into low-temperature low-pressure gas through heat absorption; through cooperative control, cooling resources are fully used, the same liquid cooling loop and the same refrigerating loop are used for meeting the requirements of constant-temperature operation of the energy storage battery cluster and the operation temperature of the inverter cabinet, and the energy storage equipment can operate reliably, safely and stably.
Description
Technical Field
The invention relates to the technical field of cooling equipment of energy storage power stations, in particular to an energy storage battery integrated cooling system and a control method.
Background
The energy-saving and energy-saving control system has the advantages that important strategic measures of carbon peak reaching and carbon neutralization are realized, energy conservation and emission reduction are promoted, 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 an energy storage system is maintained.
Loss caused by thermal runaway of the energy storage battery cannot be estimated, 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 to flow through the module to achieve the purpose of heat dissipation, a fan, an inlet and outlet air duct and other components are generally needed, an independent system is needed to be established to provide the heating or cooling function, the battery state is independently controlled, and 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: the fan arranged in the cabinet body provides a wind pressure head and wind volume for the internal circulation; an axial flow fan is generally adopted, and the fan has the characteristics of large air quantity and small pressure head. Considering the spatial arrangement of other equipment in the cabinet, the air flow of the internal circulation is difficult to organize properly, and the problems of poor internal circulation effect and uneven heat dissipation exist; and after the internal circulation is well 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 is that the wind speed at some or even most heat sources is very low, only 1-2 m/s, and the low wind speed makes the air flow direction at the heat source not to exert the heat dissipation effect to the maximum extent. In addition, among the current air cooling system, the cooling air who accomplishes the heat exchange through heat exchanger gives off the environment in, heats the environment and makes air cooling system's cooling air can appear the phenomenon of mixing with the hot-air at the flow in-process for the cooling air that originally needs microthermal has been heated, and such defect has not only reduced energy storage battery's cooling efficiency, simultaneously because the unstability of coolant temperature, is difficult to satisfy the requirement of battery cluster constant temperature operation.
In the prior art 1(CN107444103B), "an electric vehicle integrated thermal management system" includes 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 pipe; 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 pipe; the refrigerating and heating circulating 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 a heat pump air conditioner refrigeration cycle and a heating cycle system through the phase change heat exchanger, when the heating cycle is carried out, the phase change heat exchanger transfers the stored energy to the evaporator for preheating, and when the refrigeration cycle is carried out, the evaporator transfers the heat to the phase change heat exchanger for storing the energy. In the prior art 1, the phase change heat exchanger is adopted, so that the characteristics of high phase change latent heat and heat conductivity of the phase change material are fully exerted, 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, phase change materials are filled in the two heat exchangers, and the phase change materials need to be filled in the corresponding branch pipes, so that the problems of durability and economy exist in the use process, firstly, the thermophysical properties of the phase change materials are degraded in the cyclic phase change process, secondly, the phase change materials leak out from the base materials, and the frost forms on the surfaces of the materials, and furthermore, the base materials are easily damaged due to the stress generated in the phase change process. And moreover, the phase-change material is used in a large amount, so that the construction cost of the cooling system is obviously improved, and from the perspective of the whole life cycle of the engineering, if the phase-change material is used in the high-power energy storage battery cooling system, the initial investment is high, and the maintenance cost is also high.
In addition, if liquid is used as a medium to conduct heat transfer and cooling on 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 conduct indirect heating and cooling in two modes of convection and heat conduction, the heat transfer medium can be water, glycol or even refrigerant, the structure is too large and complex due to the need of a fan, a water pump, a heat exchanger, a heater, a pipeline and other accessories, 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 is mature in technology and accurate in temperature control, and can meet the technical requirements of accurate temperature control and constant-temperature operation of the energy storage battery, the liquid cooling system cannot be integrated with the energy storage battery due to a complex heat exchange structure and a complex medium channel.
Therefore, a cooling system capable of being integrated with the energy storage battery needs to be researched, so that the accurate temperature control and constant temperature operation of the energy storage battery are met.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an integrated cooling system of an energy storage battery and a control method.
The invention adopts the following technical scheme.
An energy storage battery integrated cooling system is used for cooling an inverter cabinet and an energy storage battery cluster in an energy storage battery system.
A cooling system is integrated in the energy storage battery system, the cooling system comprising: a liquid cooling circuit, a refrigeration circuit and an evaporator; the liquid cooling loop and the refrigeration loop are arranged in parallel through the evaporator; the cooling system simultaneously cools the inverter cabinet and the energy storage battery cluster, wherein the 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 refrigerating loop; a cooling medium flows through the cooling medium pipeline, a cooling medium flows through the refrigerant branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
in the evaporator, after the cooling medium and a refrigerant body carry out first heat exchange, the cooling medium realizes cooling through heat release, and the refrigerant body realizes changing from low-temperature low-pressure liquid into low-temperature low-pressure gas through heat absorption;
wherein the cooling medium is liquid.
The liquid cooling loop includes: the cooling system 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, after flowing out of the main circulating pump, a cooling medium flows into the evaporator through a first cooling medium pipeline; in a cooling medium branch of the evaporator, after the cooling medium and the refrigerant body carry out first heat exchange, the cooling medium flows into a liquid cooling inlet end of the cooled part through a second cooling medium pipeline; and in the cooled piece, after the cooling medium and the cooled piece carry out secondary heat exchange, the cooling medium flows out from the liquid cooling outlet end of the cooled piece and flows into the main circulating pump through a third cooling medium pipeline.
The refrigeration circuit comprises: the system comprises a compressor, a condenser, a throttle valve and a cold medium pipeline;
in the refrigeration loop, a refrigerant body flows into an evaporator, and in a refrigerant body branch of the evaporator, a cold medium and a cooling medium perform primary heat exchange and then sequentially flow into a compressor, a condenser and a throttle valve through a refrigerant body pipeline.
In the refrigeration loop, the refrigerant flowing into the evaporator is low-temperature low-pressure liquid, and the refrigerant flowing out of the evaporator is low-temperature low-pressure gas; the compressor compresses low-temperature and low-pressure gas to obtain high-temperature and high-pressure gas; condensing the high-temperature high-pressure gas into medium-temperature high-pressure liquid in a condenser; the medium-temperature high-pressure liquid forms low-temperature low-pressure liquid at the throttling valve.
The refrigeration loop also comprises a gas-liquid separator and a gas-liquid filter;
the refrigerant flowing out of the evaporator enters a gas-liquid separator to realize gas-liquid separation in low-temperature and low-pressure gas; the low-temperature and low-pressure gas after gas-liquid separation enters a compressor;
the refrigerant flowing out of the condenser enters a gas-liquid filter to realize gas-liquid filtration in the medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid after gas-liquid filtration enters the throttle valve.
The filter is connected in series on a first cooling medium pipeline connecting the outlet end of the main circulating pump and the inlet end of the evaporator;
the second cooling medium pipeline connecting the outlet end of the evaporator and the liquid cooling inlet end of the cooled part is sequentially connected with the heater in series; and a third cooling medium pipeline connecting the liquid cooling outlet end of the cooled part and the inlet end of the main circulating pump and connected with the high-level water tank in parallel.
After the cooling medium flows into the liquid cooling inlet end of the cooling part, the cooling medium sequentially passes through the liquid cooling pipeline and the first liquid cooling branch to reach the inlet end of a liquid cooling system of the inverter cabinet and further sequentially passes through the liquid cooling pipeline and the second liquid cooling branch to reach the outlet end of the liquid cooling system of the energy storage battery cluster;
a third ball valve is connected in series on the liquid cooling pipeline; a first ball valve is connected in series on the second liquid cooling branch;
the outlet end of the liquid cooling system of the inverter cabinet is connected with the outlet end of the liquid cooling system of the cooling part 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 part through a fourth liquid cooling branch;
the second liquid cooling branch is also connected with a liquid cooling outlet end of the cooled part through a fifth liquid cooling branch, and a connecting point A of the fifth liquid cooling branch connected to the second liquid cooling branch is positioned between the first ball valve and the outlet end of the liquid cooling system of the energy storage battery cluster; and the fifth liquid cooling branch is connected with a second ball valve in series.
A first inlet pressure gauge is arranged on the first cooling medium pipeline between the main circulating pump and the filter;
a first temperature gauge 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;
on the second liquid cooling branch, a second thermometer and a second outlet pressure gauge are arranged 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 temperature gauge and a third outlet pressure gauge are arranged on the third cooling medium pipeline between the liquid cooling outlet end of the cooled part and the connecting point of the high-level water tank connected into the third cooling medium pipeline.
A second inlet pressure gauge and a fourth thermometer are arranged on a cold medium pipeline between the condenser and the gas-liquid filter;
and a fifth thermometer and a fourth outlet pressure gauge are arranged on a cold medium 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 a temperature signal, a pressure signal, a flow signal, a liquid level signal and a heater power signal by using an instrument and a sensor; wherein the content of the first and second substances,
the temperature signal includes: the inlet temperature of the liquid cooling system of the cooled part, 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 part, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of a compressor, the outlet pressure of a main circulating pump and the outlet pressure of a 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;
a heater power signal, being the input power to the heater;
and the control module is used for controlling the starting, stopping and protecting 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 operating temperature of an energy storage battery cluster and the operating 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 opening 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;
Preferably, in the step 2, in the self-circulation temperature-equalizing mode, the refrigeration system is not started, that is, the compressor is not started, and the fan of the condenser is not started; in the self-circulation temperature-equalizing mode, a heater in a cooling system is not started, and a cooling medium returns to a main circulating pump after sequentially passing through a main circulating pump, a filter, the heater and a liquid cooling system of a cooled part;
in the self-circulation temperature-equalizing mode, the cooling system operates for not less than 2 minutes.
Preferably, step 3 comprises:
step 3.1, 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 part and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled part, the refrigeration loop is not started, namely, the fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop self-circulates; at the moment, the operating temperature range of the energy storage battery cluster is 20-25 ℃, and the operating temperature of the inverter cabinet is 40 ℃;
3.2, when the operating temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled part, starting a refrigeration loop, namely starting a fan of the condenser and starting a compressor after the fan is started and runs for 30 s; during the starting process of the refrigeration loop, the main circulating pump keeps running.
Preferably, step 3.1 further comprises: when the operating temperature of the energy storage battery cluster is not more than the inlet temperature of the cooled part liquid cooling system and the operating temperature of the inverter cabinet is not more than the inlet temperature of the cooled part liquid cooling system, the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not more than the opening temperature limit value of the cooling system, the cooling system is powered off, and the operation is stopped.
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 close the channel, the first ball valve opens the channel, and at the moment, cooling media enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch in sequence and then enter the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch in sequence; cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a series connection mode, namely cooling the inverter cabinet again by using the cooling liquid after cooling the energy storage battery cluster;
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, the first ball valve closes the channel, and at the moment, after cooling media sequentially enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling media further sequentially enter 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 meters are used for collecting the flow in the liquid cooling system of the energy storage battery cluster and the flow in the liquid cooling system of the inverter cabinet respectively, and when the flow in the liquid cooling system of the energy storage battery cluster is the same as the flow in the liquid cooling system of the inverter cabinet, the first ball valve opens the channel, and the second ball valve closes the channel.
Compared with the prior art, the invention has the beneficial effects that:
the cooling system and the control method thereof adopt the refrigeration loop to replace an air cooling device or a cooling tower, and use the evaporator to connect the liquid cooling loop and the refrigeration loop in parallel so as to realize the cooling of a cooling medium by a cold medium; the cooling system adopting the structure can simultaneously cool a plurality of devices such as the inverter cabinet, the energy storage battery cluster and the like under the condition of using the same liquid cooling loop and the same refrigeration loop so as to meet the requirement difference of cooling temperature difference caused by different rated operating temperatures of the devices such as the inverter cabinet, the energy storage battery cluster and the like.
The beneficial effects of the invention are as follows:
1) an air cooling device or a cooling tower is cancelled, 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, the structures of the liquid cooling loop and the refrigerating loop are miniaturized, the liquid cooling loop and the refrigerating loop can be integrated in a single cabinet body, the occupied area and the space size are effectively reduced, and a technical support is provided for the integration of a cooling system and an energy storage battery system;
2) because the operating temperature of the battery pack is about 20-25 ℃, the operating temperature of the inverter cabinet is about 40 ℃, and the operating temperature requirements of the battery pack and the inverter cabinet are different, when the same liquid cooling loop and the same refrigerating loop are used for cooling, when the difference value between the outlet temperature of the liquid cooling system of the energy storage battery pack and the inlet temperature of the liquid cooling system of the inverter cabinet is not more than the limit value, cooling media sequentially enter the liquid cooling system of the energy storage battery pack through the fourth liquid cooling branch and then sequentially enter the liquid cooling system of the inverter cabinet through the second liquid cooling branch and the first liquid cooling branch; cooling an inverter cabinet and an energy storage battery cluster in the energy storage system in a series 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 the 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, cooling media sequentially enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch and then enter the inverter cabinet liquid cooling system through the liquid cooling pipeline and the first liquid cooling branch; cooling an inverter cabinet and an energy storage battery cluster in an energy storage system in a parallel connection mode, and simultaneously meeting the operating temperature requirements of two devices;
2) the main circulating pump in the liquid cooling loop is a shield pump, and the shield pump is easier to realize complete sealing compared with a dynamic seal used by a mechanical centrifugal pump, can realize complete leakage-free, has long service life, is easy to install, can realize maintenance-free, has low noise and can not cause sound pollution to the surrounding environment;
3) the cooling system accurately controls the difference of the inlet temperature of the liquid cooling system of the cooled part within the range of +/-2 ℃ by controlling the refrigeration loop;
4) on the premise that a pipeline system in the liquid cooling system of the cooled part is kept unchanged, the inlet pressure and the inlet flow of the liquid cooling system of the cooled part are accurately controlled by adjusting a pressure manual valve or a flow manual valve in the cooling system respectively.
Drawings
Fig. 1 is a schematic structural diagram of an integrated cooling system for an energy storage battery according to the 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 cluster;
6-gas-liquid separator;
7-a compressor;
8-a condenser comprising 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-temperature table, wherein 12-1 is a first temperature table, 12-2 is a second temperature table, 12-3 is a third temperature table, 12-4 is a fourth temperature table, and 12-5 is a fifth temperature table;
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 conduit; 23-a cold medium conduit;
100-a liquid cooling inlet end of the cooled piece; 200-a liquid cooling outlet end of the cooled piece;
4 a-inlet end of liquid cooling system of inverter cabinet; 4 b-the outlet end of the liquid cooling system of the inverter cabinet;
5 a-an inlet end of a liquid cooling system of the energy storage battery cluster; 5 b-an outlet end of the liquid cooling system of the energy storage battery cluster;
FIG. 2 is a schematic exterior view of a cooling system cabinet according to an embodiment of the present invention;
FIG. 3 is a schematic view of an energy storage system container with a cooling system cabinet integrated within the energy storage system container in an embodiment of the invention;
fig. 4 is a block diagram of the steps of a control method of an integrated cooling system for energy storage batteries according to the invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Referring to fig. 1, an integrated energy storage battery cooling system is used for cooling an inverter cabinet 4 and an energy storage battery cluster 5 in an 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 circuit, a refrigeration circuit and an evaporator; wherein, the liquid cooling loop and the refrigeration loop are arranged in parallel through the evaporator 3; the cooling system simultaneously cools the inverter cabinet and the energy storage battery cluster, wherein the 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 branch; the cooling medium branch is connected in the liquid cooling loop in series, and the refrigerant body branch is connected in the refrigeration loop in series; a cooling medium flows through the cooling medium pipeline, a cooling medium flows through the refrigerant branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
in the evaporator 3, after the cooling medium and the refrigerant body perform the first heat exchange, the cooling medium realizes cooling through heat release, and the refrigerant body realizes changing from low-temperature low-pressure liquid into low-temperature low-pressure gas through heat absorption;
wherein the cooling medium is liquid.
The liquid cooling loop includes: the cooling device comprises a main circulating pump 1, a cooled part liquid inlet end 100, a cooled part liquid outlet end 200, a first cooling medium pipeline 20, a second cooling medium pipeline 21 and a third cooling medium pipeline 22;
in the liquid cooling loop, after flowing out from the main circulating pump 1, the cooling medium flows into the evaporator 3 through the first cooling medium pipeline 20; in the cooling medium branch of the evaporator 3, after the cooling medium and the refrigerant body perform the first heat exchange, the cooling medium flows into the liquid cooling inlet end 100 of the cooled part through the second cooling medium pipeline 21; after the cooling medium exchanges heat with the cooled object for the second time in the cooled object, the cooling medium flows out from the liquid cooling outlet 200 of the cooled object and flows into the main circulation pump 1 through the third cooling medium pipeline 22, and thus a liquid cooling loop is formed by circulation.
The refrigeration circuit comprises: a compressor 7, a condenser 8, a throttle valve 9 and a refrigerant pipeline 23;
in the refrigeration circuit, a refrigerant flows into the evaporator 3, and in a refrigerant branch of the evaporator 3, a refrigerant undergoes first heat exchange with a cooling medium and then flows into the compressor 7, the condenser 8, and the throttle valve 9 in this order through a refrigerant pipe 23.
In the refrigeration loop, the cold medium flowing into the evaporator 3 is low-temperature low-pressure liquid, and the refrigerant flowing out of the evaporator 3 is low-temperature low-pressure gas; the compressor 7 compresses low-temperature and low-pressure gas to obtain high-temperature and high-pressure gas; in the condenser 8, the high-temperature high-pressure gas is condensed into medium-temperature high-pressure liquid; the medium temperature and high pressure liquid forms a low temperature and 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 a gas-liquid separator 6 to realize gas-liquid separation in low-temperature and low-pressure gas; the low-temperature and low-pressure gas after gas-liquid separation enters the compressor 7;
the refrigerant fluid flowing out of the condenser 8 enters a gas-liquid filter 16 to realize gas-liquid filtration in the medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid after gas-liquid filtration enters the throttle valve 9.
A filter 2 is connected in series on a first cooling medium pipeline 20 which connects the outlet end of the main circulating pump 1 and the inlet end of the evaporator 3;
the heater 15 is connected in series on the second cooling medium pipeline 21 connecting the outlet end of the evaporator 3 and the liquid cooling inlet end 100 of the cooled part; and a third cooling medium pipeline 22 for connecting the liquid cooling outlet end 200 of the cooled part with the inlet end of the main circulating pump 1 is connected with the high-level water tank 14 in parallel.
After the cooling medium flows into the liquid cooling inlet end 100 of the cooling part, 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 further 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 outlet end 200 of the cooling element liquid cooling system 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 part through a fourth liquid cooling branch 34;
the second liquid cooling branch 32 is also connected with the liquid cooling outlet end 200 of the cooled part through a fifth liquid cooling branch 35, and a connection point a of the fifth liquid cooling branch 35 connected 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 second ball valve 18 is connected in series on the fifth liquid cooling branch 35.
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 temperature gauge 12-1 and a first outlet pressure gauge 13-1 are arranged on the second cooling medium pipeline 21 between the heater 15 and the liquid cooling inlet end 100 of the cooled part;
a second thermometer 12-2 and a second outlet pressure gauge 13-2 are arranged on the second liquid cooling branch 32 between a connection point A of the fifth liquid cooling branch 35 connected to the second liquid cooling branch 32 and a liquid cooling system outlet end 5b of the energy storage battery cluster 5;
and a third thermometer 12-3 and a third outlet pressure gauge 13-3 are arranged on the third cooling medium pipeline 22 between the liquid cooling outlet end 200 of the cooled part and the connection 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 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 pipeline 23 between the evaporator 3 and the gas-liquid separator 6.
The high-level water tank 14 is provided with a liquid level meter 10.
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 a temperature signal, a pressure signal, a flow signal, a liquid level signal and a heater power signal by using an instrument and a sensor; wherein the content of the first and second substances,
the temperature signal includes: the inlet temperature of the liquid cooling system of the cooled part, 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 part, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of a compressor, the outlet pressure of a main circulating pump and the outlet pressure of a 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;
a heater power signal, being the input power to the heater;
and the control module is used for controlling the starting, stopping and protecting 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 the premise of ensuring the normal operation of the liquid cooling unit and is the control basis of the automatic operation of the unit, the system is provided with a sensor, the acquisition module of the PLC acquires signals including temperature signals, pressure signals, flow signals and liquid level signals, and also acquires signals such as the state of a thermal relay for protecting the motor equipment, and the perfect acquisition sensor lays the foundation for the good operation of the unit. And the control system finishes the starting, stopping and protecting of equipment such as a compressor, a fan, a liquid supply pump, electric heating 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, emergency manual operation can be used, a selection switch on a door plate of the electric cabinet is set to be in an emergency manual position, the air-cooled water valve is automatically opened at the moment, the refrigerating water valve is automatically closed, then a protective cover of a manual button of the water pump is opened, the button is pressed, the water pump forcibly works to shield all faults influencing the work of the water pump, the water pump keeps running as long as the water pump does not trip, the protective cover of the manual button of the fan is opened, the button is pressed, the fan forcibly works to shield all faults influencing the work of the fan, and the fan keeps running as long as the fan does not trip, so that the emergency starting function is realized.
As shown in fig. 4, the control method of the energy storage battery integrated cooling system includes:
step 1, collecting the operating temperature of an energy storage battery cluster and the operating 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 opening 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;
specifically, in the step 2, in the self-circulation temperature-equalizing mode, the refrigeration system is not started, that is, the compressor is not started, and the fan of the condenser is not started; in the self-circulation temperature equalizing mode, a heater in the cooling system is not started, and a cooling medium returns to the main circulation pump after sequentially passing through the main circulation pump, the filter, the heater and the liquid cooling system of the cooled part;
in the self-circulation temperature-equalizing mode, the cooling system operates for not less than 2 minutes.
specifically, step 3 includes:
step 3.1, 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 part and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled part, the refrigeration loop is not started, namely, the fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop self-circulates; at the moment, 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 also includes: when the operating temperature of the energy storage battery cluster is not more than the inlet temperature of the cooled part liquid cooling system and the operating temperature of the inverter cabinet is not more than the inlet temperature of the cooled part liquid cooling system, the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not more than the opening temperature limit value of the cooling system, the cooling system is powered off, and the operation is stopped.
3.2, when the operating temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled part, starting a refrigeration loop, namely starting a fan of the condenser and starting a compressor after the fan is started and runs for 30 s; during the starting process of the refrigeration loop, the main circulating pump keeps running.
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 close the channel, the first ball valve opens the channel, and at the moment, cooling media enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch in sequence and then enter the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch in sequence; cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a series connection mode, namely cooling the inverter cabinet again by using cooling liquid after cooling the energy storage battery cluster;
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, the first ball valve closes the channel, and at the moment, after cooling media sequentially enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling media further sequentially enter 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, flow in the liquid cooling system of the energy storage battery cluster and flow in the liquid cooling system of the inverter cabinet are collected by using a flow meter respectively, and when the flow in the liquid cooling system of the energy storage battery cluster is the same as the flow in the liquid cooling system of the inverter cabinet, the first ball valve opens the channel, and the second ball valve closes the channel.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely 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 for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (17)
1. An energy storage battery integrated cooling system is used for cooling an inverter cabinet (4) and an energy storage battery cluster (5) in an energy storage battery system; it is characterized in that the preparation method is characterized in that,
a cooling system is integrated in the energy storage battery system, the cooling system comprising: a liquid cooling circuit, a refrigeration circuit and an evaporator; wherein the liquid cooling loop and the refrigeration loop are arranged in parallel through the evaporator (3); the cooling system simultaneously cools the inverter cabinet and the energy storage battery cluster, wherein the 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 the liquid cooling loop in series, and the refrigerant body branch is connected in the refrigeration loop in series; a cooling medium flows through the cooling medium pipeline, a cooling medium flows through the refrigerant branch, and the flow direction of the cooling medium is opposite to that of the cooling medium;
in the evaporator (3), after the cooling medium and the refrigerant body carry out first heat exchange, the cooling medium realizes cooling through heat release, and the refrigerant body realizes changing low-temperature low-pressure liquid into low-temperature low-pressure gas through heat absorption;
wherein the cooling medium is liquid.
2. The integrated cooling system for energy storage batteries according to claim 1,
the liquid cooling loop includes: the cooling device comprises a main circulating pump (1), a liquid cooling inlet end (100) of a cooled part, a liquid cooling outlet end (200) of the cooled part, a first cooling medium pipeline (20), a second cooling medium pipeline (21) and a third cooling medium pipeline (22);
in the liquid cooling loop, after flowing out from the main circulating pump (1), the cooling medium flows into the evaporator (3) through a first cooling medium pipeline (20); in a cooling medium branch of the evaporator (3), after the cooling medium and a refrigerant body carry out primary heat exchange, the cooling medium flows into a liquid cooling inlet end (100) of a cooled part through a second cooling medium pipeline (21); in the cooled material, the cooling medium exchanges heat with the cooled material for the second time, flows out from the cooled material liquid outlet port (200), and flows into the main circulation pump (1) through the third cooling medium pipe (22).
3. The integrated cooling system for energy storage batteries according to claim 1,
the refrigeration circuit comprises: the system comprises a compressor (7), a condenser (8), a throttle valve (9) and a refrigerant pipeline (23);
in the refrigeration circuit, a refrigerant flows into the evaporator (3), and in a refrigerant branch of the evaporator (3), a refrigerant and a cooling medium perform primary heat exchange and then sequentially flow into the compressor (7), the condenser (8) and the throttle valve (9) through a refrigerant pipeline (23).
4. The integrated cooling system for energy storage batteries according to claim 3,
in the refrigeration loop, the refrigerant flowing into the evaporator (3) is low-temperature low-pressure liquid, and the refrigerant flowing out of the evaporator (3) is low-temperature low-pressure gas; the compressor (7) compresses low-temperature and low-pressure gas to obtain high-temperature and high-pressure gas; in the condenser (8), 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 throttling valve (9).
5. The integrated cooling system for energy storage batteries according to claim 4,
the refrigeration circuit further comprises a gas-liquid separator (6) and a gas-liquid filter (16);
the refrigerant flowing out of the evaporator (3) enters a gas-liquid separator (6) to realize gas-liquid separation in low-temperature and low-pressure gas; the low-temperature and low-pressure gas after gas-liquid separation enters a compressor (7);
the refrigerant fluid flowing out of the condenser (8) enters a gas-liquid filter (16) to realize gas-liquid filtration in the medium-temperature high-pressure liquid; the medium-temperature high-pressure liquid after gas-liquid filtration enters a throttle valve (9).
6. The integrated cooling system for energy storage batteries according to claim 2,
a filter (2) is connected in series on a first cooling medium pipeline (20) which connects the outlet end of the main circulating pump (1) and the inlet end of the evaporator (3);
a heater (15) is sequentially connected in series 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 pipeline (22) connecting the liquid cooling outlet end (200) of the cooled part and the inlet end of the main circulating pump (1) and connected with the high-level water tank (14) in parallel.
7. The integrated cooling system for energy storage batteries according to claim 6,
after the cooling medium flows into a liquid cooling inlet end (100) of the cooling part, the cooling medium sequentially passes through a liquid cooling pipeline (30) and a first liquid cooling branch (31) to reach an inlet end (4a) of a liquid cooling system of the inverter cabinet (4), and further sequentially passes through the liquid cooling pipeline (30) and a second liquid cooling branch (32) to reach an outlet end (5b) of the liquid cooling system of the energy storage battery cluster (5);
a third ball valve (19) is connected in series on the liquid cooling pipeline (30); a first ball valve (17) is connected in series on the second liquid cooling branch (32);
the outlet end (4b) of the liquid cooling system of the inverter cabinet (4) is connected with the outlet end (200) of the liquid cooling of the cooling part 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 part through a fourth liquid cooling branch (34);
the second liquid cooling branch (32) is also connected with a liquid cooling outlet end (200) of the cooled part through a fifth liquid cooling branch (35), and a connection point A of the fifth liquid cooling branch (35) connected into the second liquid cooling branch (32) is positioned between the first ball valve (17) and a liquid cooling system outlet end (5b) of the energy storage battery cluster (5); and the fifth liquid cooling branch (35) is connected with a second ball valve (18) in series.
8. Integrated cooling system for energy storage cells according to claim 6 or 7,
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 on the second cooling medium pipeline (21) between the heater (15) and the liquid cooling inlet end (100) of the cooled part;
a second thermometer (12-2) and a second outlet pressure gauge (13-2) are arranged on the second liquid cooling branch (32) between a connection point A of the fifth liquid cooling branch (35) connected to the second liquid cooling branch (32) and a liquid cooling system outlet end (5b) of the energy storage battery cluster (5);
and 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 part and the connecting point of the high-level water tank (14) connected to the third cooling medium pipeline (22) on the third cooling medium pipeline (22).
9. Integrated cooling system for energy storage cells according to one of claims 3 to 5,
a second inlet pressure gauge (11-2) and a fourth thermometer (12-4) are arranged on a cold medium pipeline (23) between the condenser (8) and the gas-liquid filter (16);
a cold medium pipeline (23) between the evaporator (3) and the gas-liquid separator (6) is provided with a fifth thermometer (12-5) and a fourth outlet pressure gauge (13-4).
10. The integrated cooling system for energy storage batteries according to claim 6,
the high-level water tank (14) is provided with a liquid level meter (10).
11. Integrated cooling system for energy storage cells according to one of claims 1 to 3,
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 a temperature signal, a pressure signal, a flow signal, a liquid level signal and a heater power signal by using an instrument and a sensor; wherein the content of the first and second substances,
the temperature signal includes: the inlet temperature of the liquid cooling system of the cooled part, 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 part, the outlet pressure of the liquid cooling system of the energy storage battery cluster, the inlet pressure of a compressor, the outlet pressure of a main circulating pump and the outlet pressure of a 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;
a heater power signal, being the input power to the heater;
and the control module is used for controlling the starting, stopping and protecting of the compressor (7), the fan of the condenser (8) and the heater (15) by utilizing the PLC.
12. Control method of an energy storage battery integrated cooling system adapted for use in an energy storage battery integrated cooling system according to any one of claims 1 to 11,
the control method comprises the following steps:
step 1, collecting the operating temperature of an energy storage battery cluster and the operating 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 opening 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, firstly, a main circulating pump in the liquid cooling loop is electrified and started, and the cooling system runs in a self-circulation temperature-equalizing mode;
step 3, collecting the inlet temperature of the liquid cooling system of the cooled part; when the operating temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled part, starting a refrigerating loop, and entering the step 4; when the running temperature of the energy storage battery cluster and the running temperature of the inverter cabinet are not more than the inlet temperature of the liquid cooling system of the cooled part, the refrigerating loop is not started, and the step 2 is returned;
step 4, collecting the outlet temperature of the liquid cooling system of the energy storage battery cluster and the inlet temperature of the liquid cooling system of the inverter cabinet after the refrigeration loop is started; and controlling the first ball valve and the second ball valve according to the outlet temperature of the liquid cooling system of the energy storage battery cluster and the inlet temperature of the liquid cooling system of the inverter cabinet to cool the inverter cabinet and the energy storage battery cluster in the energy storage system.
13. The control method of the integrated cooling system for energy storage batteries according to claim 12,
in the step 2, in the self-circulation temperature-equalizing 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-equalizing mode, a heater in a cooling system is not started, and a cooling medium returns to a main circulating pump after sequentially passing through a main circulating pump, a filter, the heater and a liquid cooling system of a cooled part;
in the self-circulation temperature-equalizing mode, the cooling system operates for not less than 2 minutes.
14. The control method of the integrated cooling system for energy storage batteries according to claim 12,
the step 3 comprises the following steps:
step 3.1, 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 part and the operating temperature of the inverter cabinet is not greater than the inlet temperature of the liquid cooling system of the cooled part, the refrigeration loop is not started, namely, the fans of the compressor and the condenser are not started; the main circulating pump keeps running, and the liquid cooling loop self-circulates; at the moment, the operating temperature range of the energy storage battery cluster is 20-25 ℃, and the operating temperature of the inverter cabinet is 40 ℃;
3.2, when the operating temperature of the energy storage battery cluster is higher than the inlet temperature of the liquid cooling system of the cooled part, starting a refrigeration loop, namely starting a fan of the condenser and starting a compressor after the fan is started and runs for 30 s; during the starting process of the refrigeration loop, the main circulating pump keeps running.
15. The control method of the integrated cooling system for energy storage batteries according to claim 14,
step 3.1 also includes: and when the operating temperature of the energy storage battery cluster is not more than the inlet temperature of the liquid cooling system of the cooled part and the operating temperature of the inverter cabinet is not more than the inlet temperature of the liquid cooling system of the cooled part, and the operating temperature of the energy storage battery cluster and the operating temperature of the inverter cabinet are not more than the opening temperature limit value of the cooling system, the cooling system is powered off and stops operating.
16. The control method of the integrated cooling system for energy storage batteries according to claim 12,
step 4 comprises the following steps:
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 close the channel, the first ball valve opens the channel, and at the moment, cooling media enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch in sequence and then enter the inverter cabinet liquid cooling system through the second liquid cooling branch and the first liquid cooling branch in sequence; cooling the inverter cabinet and the energy storage battery cluster in the energy storage system in a series connection mode, namely cooling the inverter cabinet again by using cooling liquid after cooling the energy storage battery cluster;
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, the first ball valve closes the channel, and at the moment, after cooling media sequentially enter the energy storage battery cluster liquid cooling system through the fourth liquid cooling branch, the cooling media further sequentially enter 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.
17. The control method of the integrated cooling system for energy storage batteries according to claim 16,
the flow meter is used for collecting the flow in the liquid cooling system of the energy storage battery cluster and the flow in the liquid cooling system of the inverter cabinet respectively, when the flow in the liquid cooling system of the energy storage battery cluster is the same as the flow in the liquid cooling system of the inverter cabinet, the first ball valve opens the channel, and the second ball valve closes the channel.
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| CN116683085A (en) * | 2023-05-27 | 2023-09-01 | 广东合瑞盛科技有限公司 | Liquid cooling system for cooling energy storage variable frequency cabinet |
| CN117039269A (en) * | 2023-10-10 | 2023-11-10 | 深圳市德兰明海新能源股份有限公司 | Energy storage system, temperature control method thereof and computer readable storage medium |
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