Centralized multi-stage cooling system and energy storage power station

Abstract

The utility model provides a centralized multi-stage cooling system and an energy storage power station, and relates to the technical field of cooling equipment. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chilling unit, the battery box assembly comprises a plurality of battery boxes, each battery box comprises a plurality of battery cabinets, each battery box is provided with a cooling liquid main pipeline, the plurality of battery cabinets in the battery boxes are provided with cooling liquid pipelines which are communicated with one another, and the cooling liquid main pipelines are connected with the cooling liquid pipelines; the heat exchange module assembly comprises a plurality of internal heat exchange modules, each internal heat exchange module is provided with a first circulation port and a second circulation port, and the first circulation port of each internal heat exchange module is connected with a cooling liquid main pipeline of the corresponding battery box; and the water chilling unit is connected with a second circulating port of the internal heat exchange module. The centralized multi-stage cooling system can achieve the technical effects of reducing energy consumption and improving maintenance efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of cooling equipment, and in particular to a centralized multi-stage cooling system and an energy storage power station. Background Art

[0002] Liquid-cooled energy storage systems are a newly emerging energy storage technology, offering high temperature consistency, high integration, high volumetric energy density, and ease of maintenance. Liquid-cooled energy storage systems use liquid cooling to dissipate heat from the battery system. Generally speaking, a distributed design is currently the norm, with each energy storage battery cabinet or container equipped with a liquid cooling unit, located within the cabinet or container. The liquid cooling unit cools or heats the cooling medium, providing the battery with a suitable cooling temperature.

[0003] Generally speaking, as the energy density of energy storage battery cabinets / containers increases, more space inside the cabinets or containers is reserved for batteries. Liquid cooling units, as auxiliary equipment, are also increasingly being placed in smaller and smaller spaces. At the same time, the energy conversion efficiency of the energy storage system is crucial, and the lower the auxiliary power consumption, the higher the energy conversion efficiency. Liquid cooling unit power consumption often accounts for a large portion of auxiliary power consumption, so reducing this is crucial. When there are a large number of battery cabinets, each cabinet has its own independent thermal management system, requiring routine maintenance and annual inspections to be performed in each individual cabinet. This repetitive work consumes significant manpower, material resources, and time, and is energy-intensive. Utility Model Content

[0004] The purpose of this application is to provide a centralized multi-stage cooling system and energy storage power station, which can achieve the technical effects of reducing energy consumption and improving maintenance efficiency.

[0005] In a first aspect, the present application provides a centralized multi-stage cooling system, comprising a battery box assembly, a heat exchange module assembly, and a chiller;

[0006] The battery box assembly includes a plurality of battery boxes, each of which includes a plurality of battery cabinets, wherein the battery box is provided with a cooling liquid main pipeline, and the plurality of battery cabinets in the battery box are provided with cooling liquid pipes that are interconnected, and the cooling liquid main pipeline is connected to the cooling liquid pipes;

[0007] The heat exchange module assembly includes a plurality of internal heat exchange modules, each of which is provided with a first circulation port and a second circulation port, and the first circulation port of each internal heat exchange module is respectively connected to the coolant main pipeline of the corresponding battery box;

[0008] The chiller is connected to the second circulation port of the internal heat exchange module.

[0009] In the implementation process, the centralized multi-stage cooling system is designed by multiple battery boxes and multiple battery cabinets in each battery box, the thermal management system of the multiple battery boxes is designed in a multi-stage centralized manner, and a multi-stage intelligent control system is used for hierarchical regulation and control to cope with different operating conditions of the battery boxes. Therefore, the centralized multi-stage cooling system has a centralized and hierarchical thermal management system, so that the whole system is more energy-saving and efficient, and the energy efficiency ratio of the whole system is greater than 5, while the energy efficiency ratio of the conventional distributed liquid cooling unit is not greater than 3. The hierarchical design can more accurately control the temperature, help to prolong the service life of the battery and other energy storage devices, and stable temperature can maintain system performance, reduce performance decline caused by temperature fluctuations, and achieve the technical effects of reducing energy consumption and improving maintenance efficiency.

[0010] Further, the internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater, the heat exchanger is provided with a first inlet and outlet port and a second inlet and outlet port, the first inlet and outlet port of the heat exchanger is connected with the cooling liquid main pipe of the corresponding battery box, the circulating water pump and the heater are arranged between the connecting pipe of the heat exchanger and the battery box, and the second inlet and outlet port of the heat exchanger is connected with the water chiller.

[0011] In the implementation process, the circulating water pump continuously provides circulating pressure for the cooling liquid, the heater is arranged to heat the cooling liquid, and the temperature of the batteries in each battery cabinet in the battery box is adjusted.

[0012] Further, the internal heat exchange module further comprises a pressure stabilizing device, and the pressure stabilizing device is arranged between the connecting pipe of the heat exchanger and the battery box.

[0013] In the implementation process, the first circulating port and the cooling liquid pipe of the battery box assembly form a first circulating pipe, and the pressure stabilizing device can keep the pressure in the closed first circulating pipe stable.

[0014] Further, the internal heat exchange module further comprises a regulating valve, and the regulating valve is arranged between the connecting pipe of the heat exchanger and the battery box.

[0015] In the implementation process, the two ends of the regulating valve are respectively connected to the inlet end and the outlet end of the first circulating port, and the regulating valve has the adaptive adjustment function that part of the cooling liquid can bypass the regulating valve when the corresponding battery cabinet is in a low load state.

[0016] Further, the centralized multi-stage cooling system further comprises a sensor assembly, the sensor assembly comprising a plurality of sensors respectively arranged in the connecting pipeline between the battery box and the internal heat exchange module and / or the connecting pipeline between the internal heat exchange module and the water chiller unit, the sensor assembly comprising one or more of a temperature sensor, a pressure sensor, and a flow sensor.

[0017] In the above implementation process, the overall operation state of the centralized multi-stage cooling system is monitored through the sensor assembly, and the output of the entire system is adjusted in real time by monitoring the temperature, pressure, flow, and other parameters of the outlet water and return water of each part in real time.

[0018] Further, the centralized multi-stage cooling system further comprises a module regulating valve arranged in the connecting pipeline between the internal heat exchange module and the water chiller unit.

[0019] In the above implementation process, the two ends of the module regulating valve are arranged at the inlet end and the outlet end of the second circulating port, respectively, and the bypass flow between the water chiller unit and the internal heat exchange module is adjusted through the module regulating valve, so that the different heat load requirements of each battery box are adaptively adjusted through the module regulating valve.

[0020] Further, the water chiller unit comprises a water chiller unit body and a cooling tower, one end of the water chiller unit body being connected to the second circulating port of the internal heat exchange module, and the other end of the water chiller unit body being connected to the cooling tower.

[0021] In the above implementation process, the water chiller unit is a water-cooled water chiller unit, which uses water as a cooling medium and dissipates heat through a cooling tower; the working principle of the cooling tower type water-cooled water chiller unit is based on a vapor compression refrigeration cycle, which includes four key steps of compression, condensation, throttling, and evaporation; the main components of the water chiller unit body include a compressor, a condenser, an evaporator, a throttling device (such as an expansion valve), etc. These components are connected by copper pipes to form a closed system and are filled with a certain amount of refrigerant in the system.

[0022] Further, the water chiller unit further comprises an external circulating water pump arranged in the connecting pipeline between the water chiller unit body and the cooling tower.

[0023] In the above implementation process, the external circulating water pump continuously provides circulating pressure for the cooling liquid between the water chiller unit body and the cooling tower.

[0024] Further, the water chiller unit is a magnetic suspension variable frequency centrifugal unit.

[0025] In a second aspect, the application provides an energy storage power station comprising the centralized multi-stage cooling system of any one of the first aspect.

[0026] Other features and advantages of the present application will be set forth in the following description, in part in terms of the descriptions of the application and in part will become apparent to those skilled in the art upon examination of the following or can be learned from the practice of the application. The features and advantages of the application can be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

[0027] In order to make the above objectives, features and advantages of the present application more apparent, the following will specifically describe preferred embodiments of the present application, and the accompanying drawings will be described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 The structural schematic diagram of the centralized multi-stage cooling system provided by the embodiments of the present application;

[0030] Figure 2 The structural schematic diagram of the internal heat exchange module provided by the embodiments of the present application.

[0031] The drawings are as follows: battery box assembly 10; battery box 11; heat exchange module assembly 20; internal heat exchange module 21; circulating water pump 211; heat exchanger 212; heater 213; voltage stabilizing device 214; regulating valve 215; water chiller 30; water chiller body 31; cooling tower 32; external circulating water pump 33; module regulating valve 40. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely in the following in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0035] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0036] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0037] Generally, the existing commonly used liquid cooling system is mainly composed of a water chiller and a fan, and the liquid cooling system includes three heat exchange processes: first, the cold water enters the battery liquid cooling system and exchanges heat with the battery, and the battery heat is transferred to the cold water; second, the heated water enters the evaporator of the water chiller and exchanges heat with the refrigerant, and the heat of the cold water is transferred to the refrigerant; finally, the refrigerant enters the condenser, and the heat is taken out to the environment under the action of the fan; the condenser in the liquid cooling system is cooled by air cooling, and the heating function is realized by a separate electric heater in the liquid cooling system. When the winter or the ambient temperature is low, the electric heater heats the cold water to a temperature suitable for the operation of the battery; in addition, the energy storage power station often has multiple battery cabins arranged in clusters, and when each battery cabin is equipped with a fan, the heat island effect is easy to occur, thereby further reducing the cooling effect;

[0038] However, as the energy density of the energy storage battery cabinet / container becomes larger, more space in the cabinet or inside the container is reserved for the battery; as an auxiliary device, the liquid cooling unit has less and less space for arrangement; at the same time, the energy conversion efficiency of the energy storage system is crucial. Among them, the smaller the auxiliary power consumption, the higher the energy conversion efficiency, and the power consumption of the liquid cooling unit often accounts for a large part of the auxiliary power consumption. Therefore, it is of great significance to reduce the power consumption of the liquid cooling unit. When the number of battery boxes is large, the internal thermal management system of each box is independent, and daily maintenance, annual inspection and other work need to be done in each individual box, which requires a lot of manpower, material resources and time cost, and high energy consumption.

[0039] To solve the above-mentioned technical problems, the embodiment of the present application provides a centralized multi-stage cooling system and an energy storage power station, which can be applied to the process of battery cooling / cooling / temperature regulation of the energy storage power station; please see Figure 1 and Figure 2 , Figure 1 The structure diagram of the centralized multi-stage cooling system provided by the embodiment of the present application, Figure 2 The structure diagram of the internal heat exchange module provided by the embodiment of the present application; the centralized multi-stage cooling system comprises a battery box assembly 10, a heat exchange module assembly 20 and a water chiller 30;

[0040] Exemplarily, the battery box assembly 10 comprises a plurality of battery boxes 11, and the battery box 11 comprises a plurality of battery cabinets, wherein the battery box 11 is provided with a cooling liquid main pipe, and the plurality of battery cabinets in the battery box 11 are provided with cooling liquid pipes that communicate with each other, and the cooling liquid main pipe is connected with the cooling liquid pipes;

[0041] Exemplarily, the battery box assembly 10 comprises a plurality of battery boxes 11, and each battery box 11 comprises a plurality of battery cabinets, the specific number of which can be set according to actual needs; each battery box 11 is provided with a cooling liquid main pipe, and the cooling liquid of the internal heat exchange module is communicated by the cooling liquid main pipe, so as to deliver the cooling liquid of the internal heat exchange module to the cooling liquid pipes of each battery cabinet, and adjust the temperature of the battery in the battery cabinet by the cooling liquid.

[0042] In some embodiments, the cooling liquid provided by the embodiment of the present application can be cooling water or other medium, which is only an example and not a limitation.

[0043] Exemplarily, the heat exchange module assembly 20 comprises a plurality of internal heat exchange modules 21, and the internal heat exchange module 21 is provided with a first circulation port and a second circulation port; the first circulation port of each internal heat exchange module 21 is connected with the cooling liquid main pipe of the corresponding battery box 11 respectively;

[0044] Exemplarily, the first circulation port and the second circulation port in the internal heat exchange module 21 are not communicated with each other, wherein the first circulation port and the cooling liquid pipeline of the battery box assembly 10 constitute a first circulation pipeline, the second circulation port and the cooling liquid pipeline in the water chiller 30 constitute a second circulation pipeline, and the first circulation pipeline and the second circulation pipeline exchange heat in the internal heat exchange module 21.

[0045] Exemplarily, the water chiller 30 is connected with the second circulation port of the internal heat exchange module 21.

[0046] In the present application, the water chiller 30 is a kind of device commonly used in refrigeration industry, mainly used for providing cooling capacity.

[0047] Optionally, the cooling liquid after heat exchange with the battery flows out from the plurality of battery cabinets (such as battery cabinets 1-1, 1-2, 1-n), is converged, passes through the internal heat exchange module 21, is heated or cooled in the internal heat exchange module 21 to reach a suitable set temperature, and returns to the battery box 11 to exchange heat with the battery in the liquid cooling plate in the battery box 11, so as to complete a cycle; n battery cabinets correspond to one internal heat exchange module 21, which is responsible for providing cooling liquid at a suitable temperature to the n battery cabinets.

[0048] In some embodiments, the centralized multi-stage cooling system adopts a design mode that a plurality of battery boxes 11 are configured with a plurality of battery cabinets, a multi-stage centralized design of the thermal management system of the plurality of battery boxes 11 is adopted, and a multi-stage intelligent control system is adopted for grading control to cope with different operating conditions of the battery boxes 11; thus, the centralized multi-stage cooling system has a centralized and graded design of the thermal management system, so that the whole centralized multi-stage cooling system is more energy-saving and efficient, and the energy efficiency ratio of the whole system is greater than 5, while the energy efficiency ratio of a conventional distributed liquid cooling unit is not greater than 3; meanwhile, the graded design can more accurately control the temperature, which helps to prolong the service life of the battery and other energy storage devices, the stable temperature can maintain the system performance, reduce the performance decline caused by temperature fluctuation, and achieve the technical effects of reducing energy consumption and improving maintenance efficiency.

[0049] Exemplarily, the internal heat exchange module 21 includes a circulating water pump 211, a heat exchanger 212, and a heater 213, the heat exchanger 212 is provided with a first inlet and outlet port and a second inlet and outlet port, the first inlet and outlet port of the heat exchanger 212 is connected with the cooling liquid main pipeline of the corresponding battery box 11, the circulating water pump 211 and the heater 213 are arranged between the connecting pipeline of the heat exchanger 212 and the battery box 11, and the second inlet and outlet port of the heat exchanger 212 is connected with the water chiller 30.

[0050] Exemplarily, the circulating water pump 211 constantly provides circulating pressure for the cooling liquid, the heater 213 is arranged to heat the cooling liquid, and thus the temperature of the battery in each battery cabinet in the battery box is adjusted.

[0051] Exemplarily, the internal heat exchange module 21 further comprises a pressure stabilizing device 214, which is arranged between the connecting pipeline of the heat exchanger 212 and the battery box 11.

[0052] Exemplarily, the first circulating port and the cooling liquid pipeline of the battery box assembly 10 constitute a first circulating pipeline, and the pressure stabilizing device 214 can keep the pressure in the closed first circulating pipeline stable.

[0053] Exemplarily, the internal heat exchange module 21 further comprises an adjusting valve 215, which is arranged between the connecting pipeline of the heat exchanger 212 and the battery box 11.

[0054] Exemplarily, the two ends of the adjusting valve 215 are connected to the inlet end and the outlet end of the first circulating port respectively, and the adjusting valve 215 can realize adaptive adjustment function by bypassing part of the cooling liquid when the corresponding battery cabinet is under load.

[0055] Exemplarily, the centralized multi-stage cooling system further comprises a sensor assembly, which comprises a plurality of sensors arranged in the connecting pipeline between the battery box 11 and the internal heat exchange module 21 and / or the connecting pipeline between the internal heat exchange module 21 and the water chiller 30, and the sensor assembly comprises one or more of a temperature sensor, a pressure sensor and a flow sensor.

[0056] Exemplarily, the running state of the whole centralized multi-stage cooling system is monitored through the sensor assembly, and the output of the whole system is adjusted in real time by real-time monitoring of the temperature, pressure and flow of the outlet water and return water of each part.

[0057] Exemplarily, the centralized multi-stage cooling system further comprises a module adjusting valve 40, which is arranged between the connecting pipeline of the internal heat exchange module 21 and the water chiller 30.

[0058] Exemplarily, the two ends of the module adjusting valve 40 are arranged at the inlet end and the outlet end of the second circulating port respectively, and the bypassing amount between the water chiller 30 and the internal heat exchange module 21 is adjusted through the module adjusting valve 40, so as to adaptively adjust the different heat load demands of each battery box through the module adjusting valve.

[0059] Exemplarily, the water chiller 30 comprises a water chiller body 31 and a cooling tower 32, one end of the water chiller body 31 is connected to the second circulating port of the internal heat exchange module 21, and the other end of the water chiller body 31 is connected to the cooling tower 32.

[0060] Exemplarily, the water chiller 30 adopts a water-cooled water chiller, uses water as a cooling medium, and dissipates heat through a cooling tower; the working principle of the cooling tower type water-cooled water chiller is based on a vapor compression refrigeration cycle, which includes four key steps of compression, condensation, throttling and evaporation; the main components of the water chiller body 31 include a compressor, a condenser, an evaporator, a throttling device (such as an expansion valve), etc. These components are connected by copper pipes to form a closed system, and a certain amount of refrigerant is filled in the system.

[0061] Exemplarily, the water chiller 30 further includes an external circulating water pump 33, which is arranged between the connecting pipeline of the water chiller body 31 and the cooling tower 32.

[0062] Exemplarily, the external circulating water pump 33 continuously provides circulating pressure for the cooling liquid between the water chiller body 31 and the cooling tower 32.

[0063] Exemplarily, the water chiller 30 is a magnetic suspension variable frequency centrifugal unit.

[0064] Exemplarily, the high-efficiency magnetic suspension variable frequency centrifugal unit is an advanced refrigeration equipment that combines magnetic suspension bearing technology and variable frequency drive technology. The magnetic suspension bearing technology makes the rotating parts of the compressor without physical contact, thereby reducing friction and wear, improving efficiency and reliability. Because there is no physical contact, no lubricating oil is needed, which further improves the energy efficiency ratio and reduces the maintenance requirement. The variable frequency drive technology refers to controlling the speed of the motor through the frequency converter, which can adjust the refrigerating capacity according to the actual demand, realize more accurate temperature control and higher energy efficiency. The frequency conversion technology also allows the unit to operate efficiently under different loads, further reducing energy consumption.

[0065] Exemplarily, the embodiment of the application provides a kind of energy storage power station, including Figure 1 And Figure 2 The centralized multi-stage cooling system shown in.

[0066] In some implementation scenarios, in combination with Figure 1 And Figure 2 The specific operation process example of the centralized multi-stage cooling system provided by the embodiment of the application is as follows:

[0067] The cooling water after heat exchange with the battery flows out from multiple battery cabinets (such as battery cabinets 1-1, 1-2, 1-n), converges, passes through the internal heat exchange module, is heated or cooled inside the internal heat exchange module to reach the appropriate set temperature, and returns to the battery box. The cooling water exchanges heat with the battery in the liquid cooling plate in the battery box to complete a cycle. The n battery cabinets correspond to one internal heat exchange module, which is responsible for providing cooling liquid at the appropriate temperature to the n battery cabinets;

[0068] The cooling liquid after heat exchange with the internal heat exchange module flows to the water chiller for secondary heat exchange. N internal heat exchange modules correspond to one water chiller. Each internal heat exchange module is designed with an adjusting valve outside to adapt to different heat load requirements of the battery;

[0069] The water chiller adopts a water-cooled water chiller. Water is used as a cooling medium, and heat is dissipated through a cooling tower. The working principle of the cooling tower type water-cooled water chiller is based on the vapor compression refrigeration cycle, which includes four key steps of compression, condensation, throttling and evaporation. The main components of the water chiller include a compressor, a condenser, an evaporator, a throttling device (such as an expansion valve), etc. These components are connected by copper pipes to form a closed system and are filled with a certain amount of refrigerant in the system;

[0070] During the refrigeration cycle, the compressor sucks in low-temperature and low-pressure refrigerant gas from the evaporator and compresses it into high-temperature and high-pressure gas. This high-pressure gas then flows through the condenser, where the refrigerant releases heat through heat exchange, thereby condensing into a liquid state. After passing through the throttling device (such as the expansion valve), the pressure and temperature of the liquid refrigerant are reduced, becoming low-temperature and low-pressure liquid. This low-temperature and low-pressure liquid refrigerant then flows into the evaporator, where it absorbs heat and evaporates into a gaseous state, thereby achieving the refrigeration effect. The gaseous refrigerant after evaporation is again sucked into the compressor for circulation and repetition;

[0071] The water-cooled water chiller uses water as a cooling medium. During the condensation process, cooling water flows through the condenser, absorbing the heat released by the refrigerant, allowing the refrigerant to condense into a liquid state. The warmed cooling water then flows into the cooling tower, where it exchanges heat with the atmosphere, and then flows back into the water chiller for recycling;

[0072] The internal heat exchange module mainly includes a circulating water pump, a pressure stabilizing device, a heat exchanger, a heater, an adjusting valve and a number of sensors for monitoring pressure, temperature and flow. The circulating water pump continuously provides circulating pressure for the cooling medium, the heater is responsible for heating the cooling liquid, and the pressure stabilizing device can keep the pressure in the closed system stable. The adjusting valve functions to adapt to low load work of the corresponding battery cabinet by bypassing part of the cooling liquid through the adjusting valve to realize the adjustment function;

[0073] Temperature, pressure and flow sensors are provided at each link to monitor the temperature, pressure and flow of the outlet and return water in real time, and to adjust the output of the entire system in real time through frequency conversion;

[0074] The centralized monitoring system is provided. The battery equipment is centrally managed, and automatic optimization control is performed according to process and energy saving requirements, so that unattended operation of the energy storage battery room is realized, the energy consumption of the system is minimized under the premise of meeting the cold demand of the equipment, and a data management cloud platform is provided. A visual, easy-to-manage, easy-to-statistics energy consumption statistics, analysis and evaluation management platform is provided for the operation of the entire cooling system, so as to improve the energy utilization efficiency; and a comprehensive management system of the energy storage power station is provided. According to the air conditioning system parameters required by the energy storage battery management system of the manufacturer, a corresponding data interface is provided;

[0075] The automatic control system adopts an active optimization strategy, takes the energy consumption and capacity of key components as basic data, and adopts an active optimization deep energy saving control system to actively optimize the control of cooling water return temperature, supply and return water temperature difference, water pump, main machine and cooling tower, analyzes the influence of the running frequency of each water pump and cooling tower on the energy efficiency of the main machine, finds the best coupling point from a large amount of data, and makes the whole cooling system run at the highest energy efficiency. The equipment can still maintain high efficiency under partial load conditions, and the energy consumption of the cooling system changes synchronously with the battery load and outdoor temperature and humidity conditions, so that the overall operation energy efficiency of the system is optimized;

[0076] In the design of the water chiller unit, a high-efficiency magnetic suspension variable frequency centrifugal unit is selected, and the energy efficiency ratio of the low load condition is 20% to 50% higher than that of the conventional variable frequency centrifugal unit, and the energy efficiency ratio of the high load condition is 5% to 15% higher than that of the conventional variable frequency centrifugal unit.

[0077] Exemplarily, the centralized multi-stage cooling system and energy storage equipment provided by the embodiment of the application at least have the following beneficial effects:

[0078] 1. The thermal management system of the energy storage power station is centrally and hierarchically designed, so that the entire liquid cooling system is more energy-saving and efficient, and the energy efficiency ratio of the entire system is greater than 5, while the energy efficiency ratio of the conventional distributed liquid cooling unit is not greater than 3. The hierarchical design can more accurately control the temperature, which helps to prolong the service life of the battery and other energy storage equipment. Stable temperature can also maintain system performance and reduce performance degradation caused by temperature fluctuations;

[0079] 2. Each part is designed in a modular manner: each part is designed in a modular manner, which is convenient for installation, maintenance and upgrading;

[0080] 3. Intelligent control system adopts high efficiency operation strategy, which is very important for energy saving. Through the early energy consumption, capacity data input of each module, and the comparison of historical data and the regularity of load change analysis, etc., to ensure that the water chiller runs in the high efficiency area of its full load performance curve, which can significantly improve the energy saving effect. Research shows that the high efficiency operation strategy will increase the energy saving rate of the water chiller by an average of 32%. At the same time, with the intelligent control system and energy consumption and energy efficiency evaluation system, for high efficiency machine room, there must be a perfect and accurate monitoring and energy consumption and energy efficiency evaluation system, which can clearly understand the energy efficiency of each device and system, compare and analyze the difference between design efficiency and actual operation efficiency, use the intelligent control system to analyze the data and optimize the operation strategy in real time, to ensure the continuous and efficient and healthy operation of the air conditioning system. Through digital wisdom management, reduce system loss, get rid of the dependence on people, and achieve predictive maintenance;

[0081] 4. Reliability and life: the graded liquid cooling system control reduces the independent load regulation capability of each part of the battery cabinet, improves the overall reliability and life of the system. At the same time, it can also better operate in various environmental conditions and is not affected by external temperature changes, which is especially important for energy storage systems in extreme climate conditions.

[0082] In all embodiments of the present application, "large", "small" are relative, "more", "less" are relative, "up", "down" are relative, and the application examples will not be described again.

[0083] It should be understood that "in the present embodiment", "in the present application embodiment" or "as an optional embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in the present embodiment", "in the present application embodiment" or "as an optional embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0084] In various embodiments of the present application, it should be understood that the size of the serial number of the above processes does not mean the inevitable sequence of execution, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0085] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A centralized multi-stage cooling system, characterized by, The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module.

2. The centralized multi-stage cooling system of claim 1, wherein, The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater.

3. The centralized multi-stage cooling system of claim 2, wherein, The internal heat exchange module further comprises a pressure stabilizing device.

4. The centralized multi-stage cooling system of claim 2 or 3, wherein, The internal heat exchange module further comprises a regulating valve.

5. The centralized multi-stage cooling system of claim 1, wherein, The centralized multi-stage cooling system further comprises a sensor assembly.

6. The centralized multi-stage cooling system of claim 1, wherein, The centralized multi-stage cooling system further comprises a module regulating valve.

7. The centralized multi-stage cooling system of claim 1, wherein, The water chiller unit comprises a water chiller unit body and a cooling tower.

8. The centralized multi-stage cooling system of claim 7, wherein, The water chiller unit further comprises an external circulating water pump.

9. The centralized multi-stage cooling system of claim 1, wherein, The water chiller unit is a magnetic suspension variable frequency centrifugal unit.

10. An energy storage power plant characterized by, The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system further comprises a sensor assembly. The centralized multi-stage cooling system further comprises a module regulating valve. The water chiller unit comprises a water chiller unit body and a cooling tower. The water chiller unit further comprises an external circulating water pump. The water chiller unit is a magnetic suspension variable frequency centrifugal unit. The centralized multi-stage cooling system comprises a battery box assembly, a heat exchange module assembly and a water chiller unit. The battery box assembly comprises a plurality of battery boxes, and each battery box comprises a plurality of battery cabinets. The heat exchange module assembly comprises a plurality of internal heat exchange modules. The water chiller unit is connected to the second circulation port of the internal heat exchange module. The internal heat exchange module comprises a circulating water pump, a heat exchanger and a heater. The internal heat exchange module further comprises a pressure stabilizing device. The internal heat exchange module further comprises a regulating valve. The centralized multi-stage cooling system

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