CN114512740A - Modular energy storage battery cooling system and control method - Google Patents
Modular energy storage battery cooling system and control method Download PDFInfo
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- CN114512740A CN114512740A CN202111629371.2A CN202111629371A CN114512740A CN 114512740 A CN114512740 A CN 114512740A CN 202111629371 A CN202111629371 A CN 202111629371A CN 114512740 A CN114512740 A CN 114512740A
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- 238000001816 cooling Methods 0.000 title claims abstract description 176
- 238000004146 energy storage Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000498 cooling water Substances 0.000 claims abstract description 86
- 238000005057 refrigeration Methods 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 80
- 238000013461 design Methods 0.000 claims description 14
- 230000017525 heat dissipation Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000008400 supply water Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
- 238000007789 sealing Methods 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
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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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
- H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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Abstract
A cooling system and a control method for a modular energy storage battery are provided, wherein the cooling system cabinet is internally provided with: an electric cabinet; the control mode of the electric cabinet comprises: remote control and local control; wherein the control logic for in-place control comprises: an automatic mode, a forced cooling mode, a forced heating mode, a standby mode, a shutdown mode and a manual control mode; in the standby mode, the electric cabinet starts the cooling system to enter an automatic mode according to the battery cluster state signal; in an automatic mode, the electric cabinet controls the cooling system to enter a refrigeration cycle or a heating cycle according to a cooling water supply temperature signal, so that the cooling water supply temperature is adjusted within a cooling water supply temperature setting range, and the refrigerating capacity of the cooling system is equal to the sum of the heat productivity of the battery cluster and the self-heat productivity of the refrigerating unit; the invention adjusts the refrigeration or heating of the cooling system according to the refrigeration quantity required by the battery in the running state of the battery in the high-temperature environment so as to ensure that the system is in a constant-temperature controllable state.
Description
Technical Field
The invention belongs to the technical field of cooling of high-power electrical equipment, and particularly relates to a modular energy storage battery cooling system and a control method.
Background
In response to the national "3060 dual-carbon target", the energy storage industry will meet the rapid development demand, and the market demand for energy storage battery systems will be higher and higher. The energy storage battery system generally has the problems of large battery capacity and power, uneven heat generation and temperature distribution of an internal battery, high heat dissipation requirements and the like, most of conventional energy storage systems adopt an air-cooled heat dissipation system, the power consumption is high, the service life is short, the temperature difference is large and the like, which are not beneficial to equipment operation and storage, and compared with the air-cooled liquid-cooled energy storage system, the system design directions and concepts of low temperature difference, double-layer flame-retardant and explosion-proof design, modular system design, intelligent cloud monitoring and the like caused by high energy density, low power consumption and high-efficiency heat management tend to become a standard in the energy storage industry.
In the prior art, the operated centralized energy storage power stations all adopt an air-cooled heat exchange mode, and have the problems of uneven battery heat exchange, large battery core temperature fluctuation and difference and low cooling efficiency; in addition, in order to meet the development requirement of energy storage capacity, the existing energy storage power stations are all based on the modular design of battery packs, so that the reservation of an extension port is realized; considering the modular design requirement of the battery cluster, and simultaneously meeting the operation and maintenance requirements of the energy storage battery cluster, the cooling system is generally required to be arranged near the cooled device and is subjected to comprehensive modular design with the cooled device; in addition, since the construction site is limited, a cooling system is required to have a high space utilization rate. When the cooling system is arranged in the energy storage battery cluster, the cooling device is intensively arranged at one end of the battery cluster for the convenience of control, maintenance and pipeline arrangement. According to the design scheme of the battery cluster, the arrangement position of the cooling device is fixed, and the external dimension is limited by the size of the battery cluster; meanwhile, an interface between the cooling device and the battery cluster liquid cooling system needs to be designed close to the battery cluster side; in addition, a battery cluster control system and a cooling device are arranged in the container at the same time, and the equipment is limited by taking the inner size of the container as a fixed closed surface; combine cooling device self operation demand, cooling device's fan needs air inlet, air-out, consequently need reserve necessary ventilation hole on the container, and the fan must be towards the ventilation hole when arranging. The energy storage power station environment is often remote and the equipment is in an open outdoor environment. Due to the heat dissipation requirement, if a fan, a cooling tower and the like are adopted, the equipment needs to be provided with a ventilation opening, and the sealing protection condition in the same room can not be achieved even if the equipment is placed in a container. Therefore, the device has certain requirements on wind resistance, dust resistance, lightning protection and insect prevention capabilities. On one hand, the system comprehensively considers the protection grade when the type of the parts is selected, and the IP protection grade of some key parts is determined according to the use environment. And a mesh enclosure is arranged at a necessary vent of the cooling device. In addition, the system blocks each interface and opening position of the equipment, so as to prevent mosquitoes and the like from entering.
Therefore, a matched energy storage cooling system needs to be developed according to the requirement of energy storage battery modular design, and the working temperature of the battery is ensured within a reasonable range through control linkage.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a modular energy storage battery cooling system and a control method, so that various control logics are realized, cooling water within a temperature limit range is provided for a battery cluster, and the constant temperature controllability of the cooling system is realized.
The invention adopts the following technical scheme.
A cooling system for a modular energy storage battery is used for refrigerating all battery clusters in a distributed energy storage battery cabin and taking away heat of the modular energy storage battery by using cooling water.
The cooling system is arranged in a cabinet, the cooling system cabinet is arranged at one end of the battery cluster, and the cooling system cabinet is connected with the battery cluster liquid cooling system through a cooling water supply pipeline and a cooling water return pipeline;
the cooling system cabinet is internally provided with: an electric cabinet; the electric cabinet is used for providing a working power supply for the cooling system; the water pump, the heater, the compressor, the expansion valve, the fan and the valve are also controlled and protected; the cooling system is also used for monitoring the running state of the cooling system according to the running data collected by the temperature instrument, the pressure instrument and the flow instrument;
the control mode of the electric cabinet comprises: remote control and local control; wherein the control logic for in-place control comprises: an automatic mode, a forced cooling mode, a forced heating mode, a standby mode, a shutdown mode and a manual control mode;
in the standby mode, the electric cabinet starts the cooling system to enter an automatic mode according to the battery cluster state signal; in an automatic mode, the electric cabinet controls the cooling system to enter a refrigeration cycle or a heating cycle according to a cooling water supply temperature signal, so that the cooling water supply temperature is adjusted within a cooling water supply temperature setting range, and the refrigerating capacity of the cooling system is equal to the sum of the heat productivity of the battery cluster and the self-heat productivity of the refrigerating unit; wherein the battery cluster state signal includes: the cell temperature of the battery cluster and the switching signal of the battery cluster.
The equipment arranged inside the cooling system cabinet comprises: the system comprises a high-level water tank, a compressor, a plate heat exchanger, a filter, a pressure transmitter, a temperature transmitter, a butterfly valve, a water pump, a ball valve, a heater, an electric three-way valve, a condenser, a fan and an electric ball valve;
a natural heat dissipation coil pipe and a temperature and humidity transmitter are arranged outside the cooling system cabinet;
the electric cabinet is internally provided with: the system comprises a PLC, a power supply, a control module, an electronic expansion valve controller, a circuit breaker, a relay, a contactor, a signal module, an input module and an output module.
The refrigeration cycle of the cooling system includes: compressor refrigeration cycle and natural air cooling cycle;
the electric cabinet realizes the switching between the refrigeration cycle of the compressor and the natural air cooling cycle according to the environmental temperature; wherein, when the ambient temperature is not less than-12 ℃, a compressor is adopted for refrigeration cycle; when the ambient temperature is less than-12 ℃, natural air cooling circulation is adopted.
In the forced refrigeration mode, the water supply temperature of the cooling water is not lower than 10 ℃; otherwise, a shutdown mode is entered.
In the forced heating mode, the water supply temperature of the cooling water is not higher than 50 ℃; otherwise, a shutdown mode is entered.
The cooling system cabinet and the battery clusters are arranged in the container in a centralized manner, and a fan in the cooling system cabinet faces to a ventilation hole reserved on the container;
the cooling water supply pipeline and the cooling water return pipeline of the cooling system cabinet and the battery cluster liquid cooling system are both close to the battery cluster side;
a mesh enclosure is arranged at a fan hole on the cooling system cabinet; and the cooling water supply pipeline and the cooling water return pipeline of the cooling system cabinet are respectively provided with a plug.
A method of controlling a modular energy storage battery cooling system, comprising:
step 1, electrifying a water pump to run, and enabling a cooling system to enter a standby mode; pre-adjusting the water supply temperature of the cooling water in a standby mode;
Preferably, in the step 1, after the water pump is electrified and operated, the water supply temperature of the cooling water is collected; when the water supply temperature of the cooling water is not higher than 14.5 ℃, the cooling system enters a heating cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the heating cycle is stopped; when the water temperature is not lower than 17.5 ℃, the cooling system enters refrigeration cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the refrigeration cycle is stopped;
when the temperature of the cooling water supply water is between 14.5 and 15.5 ℃ and is kept for not less than 15min, the water temperature pre-adjusting state is stopped.
Preferably, in the step 2, the battery cluster management system sends the acquired battery core temperature of the battery cluster and the switching signal of the battery cluster to the electric cabinet at intervals of 30 s;
wherein, the cell temperature of the battery cluster includes: cell maximum temperature, cell minimum temperature, and cell average temperature.
Preferably, step 3 comprises:
step 3.1, the average temperature of the battery cell of the battery cluster received by the electric cabinet is increased, and when the highest temperature of the battery cell is not less than 28 ℃ and the lowest temperature of the battery cell is not less than 26 ℃, the electric cabinet controls the refrigeration cycle of the cooling system to be started;
step 3.2, the average temperature of the battery cell of the battery cluster received by the electric cabinet is reduced, and when the lowest temperature of the battery cell is less than 18 ℃, the electric cabinet gives an alarm; when the lowest temperature of the battery cell is less than 16 ℃, the heating cycle of the cooling system is controlled to be started by the electric cabinet;
and 3.3, when the average temperature of the battery cell of the battery cluster received by the electric cabinet is kept unchanged, the cooling system is kept in a state of pre-adjusting the water supply temperature of the cooling water.
Preferably, in step 4, the percentage of the operating capacity of the battery cluster is determined according to the switching signal of the battery cluster, and the target value of the cooling capacity of the cooling system is obtained according to the following relational expression:
Qs＝αQb+Qz
in the formula, QsAlpha is the ratio of the running capacity of the battery cluster, QbThe design peak value of the heat productivity of the battery cluster is 36kW and QzIs the self-heating value of the refrigerating unit.
Compared with the prior art, the invention has the beneficial effects that the refrigeration or heating of the cooling system is adjusted according to the refrigeration quantity required by the battery in the running state of the battery in the high-temperature environment so as to ensure that the system is in a constant-temperature controllable state.
The beneficial effects include:
1) according to the invention, the air-cooled water chilling unit is used for secondary heat dissipation, the plate heat exchanger is used as a heat dissipation component, the temperature of the cooled cooling water depends on the inlet water temperature of the cold water side of the plate heat exchanger, and the cooling water in a required temperature range can be still provided to achieve the heat dissipation effect when the environmental temperature is higher;
2) the system can accurately control the temperature of the cooling water, can control the running state of components and parts by monitoring the environmental temperature, the humidity, the temperature of the cooling water supply and return water and the like and acquiring information, and can adjust the temperature of the cooling water in time so as to keep the temperature of the cooling water in a reasonable range; if the temperature of the cooling water exceeds a set range, the system can send signals such as an alarm and the like to remind workers to check and operate in time;
3) the refrigeration unit is connected with a natural heat dissipation coil in parallel, and the system automatically switches the natural heat dissipation coil to refrigerate and cool under the condition of low ambient temperature; the natural heat dissipation coil pipe can effectively utilize the environment temperature to cool, saves electricity, is green and environment-friendly, and can protect the parts of the system;
4) the control logic of the distributed energy storage battery compartment is capable of adjusting the running states of components such as a water pump, a heater, a compressor, a fan and the like by acquiring signals such as the temperature, the pressure and the like of a cooling medium and a refrigerant in the equipment so as to achieve the required refrigerating and heating targets and control and protect the liquid cooling unit.
Drawings
Fig. 1 is a right side schematic view of a modular energy storage battery cooling system of the present invention;
FIG. 2 is a schematic diagram of a left side structure of a cooling system of a modular energy storage battery according to the present invention
The reference numerals in fig. 1 and 2 are explained as follows:
1-high level water tank
2-compressor
3-plate heat exchanger
4-filter
5-pressure transmitter
6-temperature transmitter
7-butterfly valve
8-water pump
9-ball valve
10-heater
11-electric three-way valve
12-condenser
13-blower
Fig. 3 is a block diagram of the steps of a control method of a modular energy storage battery cooling system 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.
A cooling system for a modular energy storage battery is used for refrigerating all battery clusters in a distributed energy storage battery cabin and taking away heat of the modular energy storage battery by using cooling water.
The cooling system is arranged in the cabinet, the cooling system cabinet is arranged at one end of the battery cluster, and the cooling system cabinet is connected with the battery cluster liquid cooling system through a cooling water supply pipeline and a cooling water return pipeline.
As shown in fig. 1 and 2, inside the cooling system cabinet are arranged: an electric cabinet; the electric cabinet is used for providing a working power supply for the cooling system; the water pump, the heater, the compressor, the expansion valve, the fan and the valve are also controlled and protected; the cooling system is also used for monitoring the running state of the cooling system according to the running data collected by the temperature instrument, the pressure instrument and the flow instrument;
the control mode of the electric cabinet comprises: remote control and local control; all remote controls fail under the local control, and only receive remote control commands but do not execute.
Wherein the control logic for in-place control comprises: an automatic mode, a forced cooling mode, a forced heating mode, a standby mode, a shutdown mode and a manual control mode;
in the standby mode, the electric cabinet starts the cooling system to enter an automatic mode according to the battery cluster state signal; in an automatic mode, the electric cabinet controls the cooling system to enter a refrigeration cycle or a heating cycle according to a cooling water supply temperature signal, so that the cooling water supply temperature is adjusted within a cooling water supply temperature setting range, and the refrigerating capacity of the cooling system is equal to the sum of the heat productivity of the battery cluster and the self-heat productivity of the refrigerating unit; wherein the battery cluster state signal includes: the cell temperature of the battery cluster and the switching signal of the battery cluster.
Under the automatic mode, all actions of the cooling system are automatically executed after the water chilling unit judges according to the actual water supply temperature change condition, and the water supply temperature is ensured to be stabilized within a reasonable range. The starting of the automatic mode is started by a manual or upper computer transmission signal, and the closing is closed by a manual or upper computer transmission signal.
In the preferred embodiment of the invention, the cooling system is started on site by the panel and enters an automatic mode, receives signals given by the battery clusters and signals of the water temperature of the cooling water, and realizes the control of the refrigerating capacity of the system by adjusting the water temperature of the cooling system; during the automatic mode, the received battery pack electric core temperature signal is used as the basis for the refrigeration and heating start of the cooling system, and the received cooling water supply temperature signal is used as the basis for adjusting the refrigeration capacity. Under the automatic mode, the state information and the control information of each equipment are uploaded to the upper computer, so that the condition of the cooling equipment can be known in real time by the energy storage power station main control system.
As shown in fig. 1 and 2, a high-level water tank 1, a compressor 2, a plate heat exchanger 3, a filter 4, a pressure transmitter 5, a temperature transmitter 6, a butterfly valve 7, a water pump 8, a ball valve 9, a heater 10, an electric three-way valve 11, a condenser 12 and a fan 13 are further arranged inside the cooling system cabinet;
a natural heat dissipation coil pipe and a temperature and humidity transmitter are arranged outside the cooling system cabinet;
the electric cabinet is internally provided with: the system comprises a PLC, a power supply, a control module, an electronic expansion valve controller, a circuit breaker, a relay, a contactor, a signal module, an input module and an output module.
The refrigeration cycle of the cooling system includes: compressor refrigeration cycle and natural air cooling cycle;
the electric cabinet realizes the switching between the refrigeration cycle of the compressor and the natural air cooling cycle according to the environmental temperature; wherein, when the ambient temperature is not less than-12 ℃, a compressor is adopted for refrigeration cycle; when the ambient temperature is less than-12 ℃, natural air cooling circulation is adopted.
In the forced refrigeration mode, the water supply temperature of the cooling water is not lower than 10 ℃; otherwise, a shutdown mode is entered.
In the forced heating mode, the water supply temperature of the cooling water is not higher than 50 ℃; otherwise, a shutdown mode is entered.
In the preferred embodiment of the invention, after the water cooling system is started, the natural air cooling circulation is started at-12 ℃, the natural air cooling circulation is stopped at-10 ℃, and the return difference value of 2 ℃ is set; meanwhile, the refrigerant enters a compressor for refrigeration cycle at the temperature of minus 10 ℃, exits the compressor for refrigeration cycle at the temperature of minus 12 ℃, and is also set with a return difference value of 2 ℃. And frequent switching and starting and stopping of the compressor are avoided by setting the return difference value of the temperature.
In the forced refrigeration mode, the water supply temperature of the cooling water is not lower than 10 ℃; otherwise, a shutdown mode is entered. In the preferred embodiment of the invention, the forced refrigeration mode is a manual mode, and after entering the forced refrigeration mode, the cooling system firstly starts the water pump and then sequentially starts the refrigeration devices in sequence; in the forced refrigeration mode, the water supply temperature of the cooling system which is required to be reached can be set, but the lowest water supply temperature is not lower than 10 ℃; especially, when the ambient temperature is in a low-temperature state, the cooling system automatically switches the cooling coil to a natural cooling coil for cooling.
In the forced heating mode, the water supply temperature of the cooling water is not higher than 50 ℃; otherwise, a shutdown mode is entered. In the preferred embodiment of the invention, the forced heating mode is a manual mode, after the forced heating mode is entered, the cooling system firstly starts the water pump, then sequentially starts the heaters according to the sequence to heat the cooling water, the heating target temperature can be set, but the maximum setting value cannot exceed 50 ℃.
In addition, in a preferred embodiment of the invention, in a standby mode, after the upper computer gives a self-running instruction, the water pump is started, the water pump is ensured to run continuously, other devices are not started, the water pump stops running until the electric cabinet sends a stop instruction, and the electric cabinet automatically uploads a state signal of the device to the upper computer in the period.
In the shutdown mode, all equipment is shut down, but the power supply is not cut off; and all protection states fail.
Except for the shutdown mode, all modes have the following common features:
1) real-time detection and uploading of the numerical value of the instrument;
2) the high-value and low-value alarm of the temperature instrument is effective;
3) when the water pump does not operate, the pressure instrument gives an alarm and is invalid. Pressure alarm cannot be generated;
4) the fault alarm function of all instruments is effective;
5) uploading corresponding states in real time when the external communication works normally, and receiving a working instruction;
6) locking within 3 minutes after any compressor is stopped, and not starting;
7) the main circulating pump is locked within 1 minute after being stopped and cannot be started;
8) the main circulating pump is in a starting state before the heater operates.
9) Before the compressor runs, the main circulating pump and the fan are in a starting state.
The cooling system cabinet and the battery clusters are arranged in the container in a centralized manner, and a fan in the cooling system cabinet faces towards a ventilation hole reserved in the container;
the cooling water supply pipeline and the cooling water return pipeline of the cooling system cabinet and the battery cluster liquid cooling system are both close to the battery cluster side;
a mesh enclosure is arranged at a fan hole on the cooling system cabinet; and a cooling water supply pipeline and a cooling water return pipeline of the cooling system cabinet are provided with plugs.
Referring to fig. 3, a method for controlling a cooling system of a modular energy storage battery includes:
step 1, electrifying a water pump to run, and enabling a cooling system to enter a standby mode; and pre-adjusting the supply water temperature of the cooling water in the standby mode.
Specifically, in the step 1, after a water pump is electrified to operate, the water supply temperature of cooling water is collected; when the water supply temperature of the cooling water is not higher than 14.5 ℃, the cooling system enters a heating cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the heating cycle is stopped; when the water temperature is not lower than 17.5 ℃, the cooling system enters refrigeration cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the refrigeration cycle is stopped; when the temperature of the cooling water supply water is between 14.5 and 15.5 ℃ and is maintained for not less than 15min, the water temperature pre-adjustment state is stopped, meanwhile, the electric cabinet sends a signal to the upper computer to inform that the preheating or pre-cooling of the water supply in the cooling system is finished, and the battery cluster can be charged or discharged after 3 minutes.
Specifically, in the step 2, at intervals of 30s, the battery cluster management system sends the acquired cell temperature of the battery cluster and the switching signal of the battery cluster to the electric cabinet;
wherein, the cell temperature of the battery cluster includes: cell maximum temperature, cell minimum temperature, and cell average temperature.
It is noted that in the preferred embodiment of the present invention, the acquisition time interval for the signal is a non-limiting preferred choice.
And 3, controlling a cooling system to enter a refrigeration cycle or a heating cycle by the electric cabinet according to the cell temperature of the battery cluster.
Specifically, step 3 includes:
step 3.1, the average temperature of the battery cell of the battery cluster received by the electric cabinet is increased, and when the highest temperature of the battery cell is not less than 28 ℃ and the lowest temperature of the battery cell is not less than 26 ℃, the electric cabinet controls the refrigeration cycle of the cooling system to be started;
step 3.2, the average temperature of the battery cell of the battery cluster received by the electric cabinet is reduced, and when the lowest temperature of the battery cell is less than 18 ℃, the electric cabinet gives an alarm; when the lowest temperature of the battery cell is less than 16 ℃, the heating cycle of the cooling system is controlled to be started by the electric cabinet;
and 3.3, when the average temperature of the battery cell of the battery cluster received by the electric cabinet is kept unchanged, the cooling system is kept in a state of pre-adjusting the water supply temperature of the cooling water. Namely, the cell temperature of the battery cluster is not continuously increased, and no instruction is sent by the upper computer, the cooling system keeps a preheating state, and the water supply temperature of the cooling system is maintained between 15 and 17.5 ℃. If the communication fault of the upper computer occurs and the battery core of the battery cluster is put into operation, the water supply temperature is controlled to be 15-21 ℃.
Specifically, in step 4, the duty ratio of the operation capacity of the battery cluster is determined according to the switching signal of the battery cluster, and the target value of the cooling capacity of the cooling system is obtained according to the following relational expression:
Qs＝αQb+Qz
in the formula, QsAlpha is the ratio of the running capacity of the battery cluster, QbThe design peak value of the heat productivity of the battery cluster is 36kW and QzIs the self-heating value of the refrigerating unit.
The cooling system also requires the three-way valve/electric valve to act according to the temperature signal collected by the outdoor ambient temperature sensor or the ambient temperature signal obtained by the conversion calculation of the condenser pressure signal, and the cooling water in the system is switched between the refrigeration cycle and the natural cooling cycle.
After the cooling mode is switched, the system controls the temperature by adjusting the rotating speed of a fan of the condenser according to the collected signals of the system outlet water temperature sensor; note that the refrigeration system is not turned on at this point, but the plate heat exchanger can still pass liquid.
The cooling mode switching is mainly based on the ambient temperature at the time, and all the switching needs to review the operation conditions of other key elements of the system before switching.
The signal of the condenser pressure sensor can also judge the cooling mode, mainly considers the specific condensing temperature corresponding to the specific pressure, and then inversely calculates the environmental temperature, so the system has the calculation logic to check the actually measured environmental temperature.
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 (11)
1. A cooling system of a modularized energy storage battery is provided, which refrigerates all battery clusters in a distributed energy storage battery cabin and uses cooling water to take away the heat of the modularized energy storage battery,
the cooling system is arranged in a cabinet, the cooling system cabinet is arranged at one end of the battery cluster, and the cooling system cabinet is connected with the battery cluster liquid cooling system through a cooling water supply pipeline and a cooling water return pipeline;
the cooling system cabinet is internally provided with: an electric cabinet; the electric cabinet is used for providing a working power supply for the cooling system; the water pump, the heater, the compressor, the expansion valve, the fan and the valve are also controlled and protected; the cooling system is also used for monitoring the running state of the cooling system according to the running data collected by the temperature instrument, the pressure instrument and the flow instrument;
the control mode of the electric cabinet comprises: remote control and local control; wherein the control logic for in-place control comprises: an automatic mode, a forced cooling mode, a forced heating mode, a standby mode, a shutdown mode and a manual control mode;
in the standby mode, the electric cabinet starts the cooling system to enter an automatic mode according to the battery cluster state signal; in an automatic mode, the electric cabinet controls the cooling system to enter a refrigeration cycle or a heating cycle according to a cooling water supply temperature signal, so that the cooling water supply temperature is adjusted within a cooling water supply temperature setting range, and the refrigerating capacity of the cooling system is equal to the sum of the heat productivity of the battery cluster and the self-heat productivity of the refrigerating unit; wherein the battery cluster state signal includes: the cell temperature of the battery cluster and the switching signal of the battery cluster.
2. Modular energy storage battery cooling system according to claim 1,
the equipment arranged inside the cooling system cabinet comprises: the system comprises a high-level water tank, a compressor, a plate heat exchanger, a filter, a pressure transmitter, a temperature transmitter, a butterfly valve, a water pump, a ball valve, a heater, an electric three-way valve, a condenser, a fan and an electric ball valve;
a natural heat dissipation coil pipe and a temperature and humidity transmitter are arranged outside the cooling system cabinet;
the electric cabinet is internally provided with: the system comprises a PLC, a power supply, a control module, an electronic expansion valve controller, a circuit breaker, a relay, a contactor, a signal module, an input module and an output module.
3. Modular energy storage battery cooling system according to claim 1,
the refrigeration cycle of the cooling system includes: compressor refrigeration cycle and natural air cooling cycle;
the electric cabinet realizes the switching between the refrigeration cycle of the compressor and the natural air cooling cycle according to the environmental temperature; wherein, when the ambient temperature is not less than-12 ℃, a compressor is adopted for refrigeration cycle; when the ambient temperature is lower than-12 ℃, natural air cooling circulation is adopted.
4. Modular energy storage battery cooling system according to claim 1,
in the forced refrigeration mode, the water supply temperature of the cooling water is not lower than 10 ℃; otherwise, a shutdown mode is entered.
5. Modular energy storage battery cooling system according to claim 1,
in the forced heating mode, the water supply temperature of the cooling water is not higher than 50 ℃; otherwise, a shutdown mode is entered.
6. Modular energy storage battery cooling system according to any of the claims 1-5,
the cooling system cabinet and the battery clusters are arranged in the container in a centralized manner, and a fan in the cooling system cabinet faces towards a ventilation hole reserved in the container;
the cooling water supply pipeline and the cooling water return pipeline of the cooling system cabinet and the battery cluster liquid cooling system are both close to the battery cluster side;
a mesh enclosure is arranged at a fan hole on the cooling system cabinet; and a cooling water supply pipeline and a cooling water return pipeline of the cooling system cabinet are provided with plugs.
7. A method of controlling a modular energy storage battery cooling system adapted to be used in a modular energy storage battery cooling system according to any of claims 1 to 6,
the control method comprises the following steps:
step 1, electrifying a water pump to run, and enabling a cooling system to enter a standby mode; pre-adjusting the water supply temperature of the cooling water in a standby mode;
step 2, collecting a battery cluster state signal and a cooling water supply temperature signal; wherein the battery cluster state signal includes: the cell temperature of the battery cluster and the switching signal of the battery cluster;
step 3, the electric cabinet controls the cooling system to enter a refrigeration cycle or a heating cycle according to the cell temperature of the battery cluster;
step 4, when the cooling system enters a refrigeration cycle, determining the heat productivity of the battery cluster according to the switching signal of the battery cluster and the design peak value of the heat productivity of the battery cluster; the water supply temperature of the cooling water is adjusted by the electric cabinet within the set range of the water supply temperature of the cooling water, so that the refrigerating capacity of the cooling system is equal to the sum of the heat productivity of the battery cluster and the self-heating productivity of the refrigerating unit; the set range of the water supply temperature of the cooling water takes the designed minimum value of the cell temperature of the battery cluster as the lower limit, and the temperature minus 1 ℃ of the cell temperature of the battery cluster as the upper limit.
8. The method of controlling a modular energy storage battery cooling system according to claim 7,
step 1, collecting the water supply temperature of cooling water after a water pump is electrified and operated; when the water supply temperature of the cooling water is not higher than 14.5 ℃, the cooling system enters a heating cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the heating cycle is stopped; when the water temperature is not lower than 17.5 ℃, the cooling system enters refrigeration cycle, and when the water supply temperature of the cooling water reaches 15.5 ℃, the refrigeration cycle is stopped;
when the temperature of the cooling water supply water is between 14.5 and 15.5 ℃ and is kept for not less than 15min, the water temperature pre-adjusting state is stopped.
9. The method of controlling a modular energy storage battery cooling system according to claim 7,
in the step 2, at intervals of 30s, the battery cluster management system sends the acquired cell temperature of the battery cluster and the switching signal of the battery cluster to the electric cabinet;
wherein, the cell temperature of the battery cluster includes: cell maximum temperature, cell minimum temperature, and cell average temperature.
10. The method of controlling a modular energy storage battery cooling system according to claim 9,
the step 3 comprises the following steps:
step 3.1, the average temperature of the battery cell of the battery cluster received by the electric cabinet is increased, and when the highest temperature of the battery cell is not less than 28 ℃ and the lowest temperature of the battery cell is not less than 26 ℃, the electric cabinet controls the refrigeration cycle of the cooling system to be started;
step 3.2, the average temperature of the battery cell of the battery cluster received by the electric cabinet is reduced, and when the lowest temperature of the battery cell is less than 18 ℃, the electric cabinet gives an alarm; when the lowest temperature of the battery cell is less than 16 ℃, the heating cycle of the cooling system is controlled to be started by the electric cabinet;
and 3.3, when the average temperature of the battery cell of the battery cluster received by the electric cabinet is kept unchanged, the cooling system is kept in a state of pre-adjusting the water supply temperature of the cooling water.
11. The method of controlling a modular energy storage battery cooling system according to claim 10,
in step 4, determining the proportion of the operation capacity of the battery cluster according to the switching signal of the battery cluster, and obtaining the target value of the refrigerating capacity of the cooling system according to the following relational expression:
Qs＝αQb+Qz
in the formula, QsAlpha is the ratio of the running capacity of the battery cluster, QbThe design peak value of the heat productivity of the battery cluster is 36kW and QzIs the self-heating value of the refrigerating unit.
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