A centralized liquid-supply liquid-cooled energy storage power station and its control method

Abstract

The present application discloses a centralized liquid supply liquid-cooled energy storage power station and its control method. The solution includes a centralized liquid-cooled unit, a control system, a pipeline system, a measurement system, and an energy storage system. Among them, the centralized liquid-cooled unit exchanges heat and circulates with the energy storage system through the pipeline system; the parameters of the centralized liquid-cooled unit are adjusted through the control system, and the flow rate of the energy storage system is distributed. By means of the centralized liquid-cooled unit in the embodiments of the present application, the number of devices and costs can be reduced, and by adjusting the parameters of the centralized liquid-cooled unit through the control system and distributing the flow rate of the energy storage system, precise control can be achieved, the operating efficiency of the liquid-cooled unit is improved, and it can be widely applied to the technical field of energy storage systems.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and particularly to a centralized liquid supply liquid-cooled energy storage power station and a control method thereof. Background Art

[0002] A liquid-cooled energy storage system is a technology that uses a liquid medium for energy storage. This technology can effectively improve energy utilization efficiency, reduce energy costs, and is also beneficial to environmental protection and sustainable development. In related technologies, the liquid-cooled energy storage system basically adopts a distributed liquid-cooling scheme, that is, a liquid chiller is configured in each energy storage container. However, the distributed liquid-cooling scheme has low refrigeration efficiency and high cost, resulting in low thermal management efficiency of the liquid-cooled energy storage system and affecting the energy-saving operation efficiency of the system.

[0003] In summary, the technical problems existing in the related technologies need to be improved. Summary of the Invention

[0004] The main object of the embodiments of the present application is to propose a centralized liquid supply liquid-cooled energy storage power station and a control method thereof, which can improve the operation efficiency of the system.

[0005] To achieve the above object, on the one hand, an embodiment of the present application proposes a centralized liquid supply liquid-cooled energy storage power station, which includes: a centralized liquid-cooling unit, a control system, a pipeline system, a measurement system, and an energy storage system; the centralized liquid-cooling unit exchanges heat with the energy storage system through the pipeline system in a circulation manner, the measurement system is installed at the inlets and outlets of the centralized liquid-cooling unit and the energy storage system, and the control system is electrically connected to the centralized liquid-cooling unit;

[0006] Wherein, the centralized liquid-cooling unit is used for performing secondary heat exchange with each energy storage unit in the energy storage system;

[0007] The control system is used for adjusting the parameters of the centralized liquid-cooling unit and distributing the flow rate of the energy storage system;

[0008] The pipeline system is used for connecting the centralized liquid-cooling unit and the energy storage system;

[0009] The measurement system is used for measuring the centralized liquid-cooling unit and the energy storage system;

[0010] The energy storage system is used for storing thermal energy.

[0011] In some embodiments, the centralized liquid-cooling unit performs secondary heat exchange with each energy storage unit in the energy storage system through a secondary heat exchange loop, and the secondary heat exchange loop includes a chiller loop and a secondary coolant loop;

[0012] Among them, the refrigeration machine circuit forms a circulation loop consisting of a compressor, a condenser, an expansion valve, the primary side of a heat exchanger, and a storage tank;

[0013] The secondary coolant circuit forms a circulation loop consisting of the secondary side of the heat exchanger, a water pump, and the energy storage unit.

[0014] To achieve the above object, on the other hand, an embodiment of the present application proposes a control method for a centralized liquid supply liquid-cooled energy storage power station, which is applied to the centralized liquid supply liquid-cooled energy storage power station as described above. The method includes the following steps:

[0015] Obtain the state parameters of the energy storage system and the operating status of the centralized liquid-cooled unit;

[0016] Adjust and control the operating parameters of the centralized liquid-cooled unit according to the state parameters of the energy storage system to obtain a parameter adjustment and control strategy;

[0017] Allocate and adjust the flow rates of the respective energy storage units in the energy storage system according to the operating status of the centralized liquid-cooled unit to obtain a flow rate adjustment and control strategy.

[0018] In some embodiments, the adjusting and controlling the operating parameters of the centralized liquid-cooled unit according to the state parameters of the energy storage system to obtain a parameter adjustment and control strategy includes the following steps:

[0019] Obtain the number of operating energy storage units in the energy storage system;

[0020] Calculate the total heat generation power according to the number of operations and the state parameters;

[0021] Calculate the refrigeration power and the total coolant flow rate according to the total heat generation power;

[0022] Adjust the working parameters of the refrigeration machine according to the refrigeration power, and adjust the water pump speed according to the total coolant flow rate to obtain a parameter adjustment and control strategy.

[0023] In some embodiments, the calculating the refrigeration power and the total coolant flow rate according to the total heat generation power includes the following steps:

[0024] Obtain the temperature rise rate of the battery cells and the temperature difference between the inlet water temperature of the coolant;

[0025] Calculate the total heat absorption power of the battery cells according to the temperature rise rate of the battery cells;

[0026] Calculate the refrigeration power according to the total heat generation power and the total heat absorption power of the battery cells;

[0027] Calculate the total coolant flow rate according to the total heat generation power and the temperature difference between the inlet water temperature of the coolant.

[0028] In some embodiments, regulating the operating parameters of the refrigerator according to the refrigeration power and regulating the rotational speed of the water pump according to the total coolant flow rate to obtain a parameter regulation strategy, which includes the following steps:

[0029] Regulate the operating parameters of the refrigerator according to the refrigeration power and regulate the rotational speed of the water pump according to the total coolant flow rate to obtain a set of regulation parameters;

[0030] Based on the parameter update period, update the refrigeration power and the total coolant flow rate to obtain an update change rate;

[0031] Adjust the set of regulation parameters according to the update change rate to obtain a parameter regulation strategy.

[0032] In some embodiments, regulating the flow rate distribution of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy, which includes the following steps:

[0033] When the operating state of the centralized liquid cooling unit is before the centralized liquid cooling unit starts, open the return pipe valve of the centralized liquid cooling unit, and then open the primary inlet pipe valve;

[0034] Adjust the opening degree of the inlet pipe valve of the energy storage unit according to the distance of the primary inlet pipe to obtain a flow rate regulation strategy.

[0035] In some embodiments, regulating the flow rate distribution of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy further includes the following steps:

[0036] When the operating state of the centralized liquid cooling unit is in the initial operation stage, collect the flow rates of each energy storage unit in the energy storage system to obtain a flow rate set;

[0037] Obtain the maximum flow rate from the flow rate set, and perform a difference calculation on the flow rate set according to the maximum flow rate to obtain a difference set;

[0038] Adjust the opening degree of the inlet pipe valve of each energy storage unit in the energy storage system according to the difference set to obtain a flow rate regulation strategy.

[0039] In some embodiments, regulating the flow rate distribution of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy further includes the following steps:

[0040] When the operating state of the centralized liquid cooling unit is in the operating temperature control stage, collect the temperatures of each energy storage unit in the energy storage system to obtain a temperature set;

[0041] Analyze and process the temperature set according to a preset temperature relationship formula to obtain an analysis result;

[0042] Adjust the opening degrees of the inlet pipeline valves of each energy storage unit in the energy storage system according to the analysis result to obtain a flow rate control strategy.

[0043] In some embodiments, the analyzing and processing the temperature set according to a preset temperature relationship formula to obtain an analysis result includes the following steps:

[0044] Determine the maximum temperature and average temperature of each energy storage unit according to the temperature set;

[0045] When the maximum temperature or average temperature of the energy storage unit meets the temperature relationship formula, determine that the analysis result is to perform flow regulation on the energy storage unit.

[0046] To achieve the above object, another aspect of the embodiments of the present application provides a control device, which is applied to the control method of the centralized liquid supply liquid cooling energy storage power station as described above. The device includes the following modules:

[0047] The first module is used to obtain the state parameters of the energy storage system and the operating state of the centralized liquid cooling unit;

[0048] The second module is used to adjust and control the operating parameters of the centralized liquid cooling unit according to the state parameters of the energy storage system to obtain a parameter control strategy;

[0049] The third module is used to allocate and control the flow rates of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate control strategy.

[0050] To achieve the above object, another aspect of the embodiments of the present application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the method described above is implemented.

[0051] To achieve the above object, another aspect of the embodiments of the present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0052] The embodiments of the present application at least include the following beneficial effects: The present application provides a centralized liquid supply liquid-cooled energy storage power station and its control method. The solution includes a centralized liquid-cooled unit, a control system, a pipeline system, a measurement system, and an energy storage system. Among them, the centralized liquid-cooled unit exchanges heat through the pipeline system with the energy storage system in a cycle; the parameters of the centralized liquid-cooled unit are adjusted through the control system, and the flow rate of the energy storage system is distributed. Through the centralized liquid-cooled unit in the embodiments of the present application, the number of devices and costs can be reduced, and through the control system to adjust the parameters of the centralized liquid-cooled unit and distribute the flow rate of the energy storage system, precise control can be achieved, and the operating efficiency of the liquid-cooled unit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 FIG. is a schematic structural diagram of a centralized liquid supply liquid-cooled energy storage power station provided by an embodiment of the present application;

[0054] Figure 2 FIG. is a schematic structural diagram of a secondary heat exchange loop provided by an embodiment of the present application;

[0055] Figure 3 FIG. is a flowchart of a control method for a centralized liquid supply liquid-cooled energy storage power station provided by an embodiment of the present application;

[0056] Figure 4 FIG. is a flowchart of regulating and controlling the operating parameters of a centralized liquid-cooled unit provided by an embodiment of the present application;

[0057] Figure 5 FIG. is a flowchart of regulating the flow rate of an energy storage unit before starting a liquid-cooled system provided by an embodiment of the present application;

[0058] Figure 6 FIG. is a flowchart of regulating the flow rate of an energy storage unit at the initial stage of operation of a liquid-cooled system provided by an embodiment of the present application;

[0059] Figure 7 FIG. is a flowchart of regulating the flow rate of an energy storage unit in the temperature control stage of operation of a liquid-cooled system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application detailed in the appended claims.

[0061] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if", "when" as used herein may be interpreted as "when...", "while...", or "in response to determining".

[0062] The terms "at least one", "a plurality of", "each", "any one", etc. used in this application, at least one includes one, two, or more than two, a plurality of includes two or more than two, each refers to each of the corresponding plurality, and any one refers to any one of the plurality.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0064] Before elaborating on the embodiments of this application in detail, some nouns and terms involved in the embodiments of this application are first explained, and the nouns and terms involved in the embodiments of this application are subject to the following explanations.

[0065] Liquid-cooled energy storage is a technology that uses a liquid medium for energy storage. When electric power is sufficient, electrical energy is converted into chemical energy, and the liquid medium is stored in an energy storage tank. In this process, heat is also converted into the internal energy of the liquid for storage. When electric power is needed, the liquid medium in the energy storage tank is released through a heat exchanger and cooled using a refrigerant to turn it back into a liquid. In this process, the stored energy is released. The application scenarios of liquid-cooled energy storage systems are extensive, including new energy power stations and microgrids, industrial electricity, integration of renewable energy, and electric vehicle charging stations, etc. In these fields, liquid-cooled energy storage systems can help improve energy utilization efficiency, reduce energy costs, and are also conducive to environmental protection and sustainable development.

[0066] The coolant distribution unit (CDU) is a device used to manage and distribute coolant. It can ensure that the coolant is evenly distributed in various parts of the CDU, improving the cooling effect. The CDU can be integrated into an intelligent controller, and through the combination of operation logic and intelligent control, it can manage the performance of server and data center cooling systems.

[0067] Coefficient Of Performance (COP): It is an important indicator for evaluating the performance of refrigeration or heating equipment. It represents the ratio of the cooling capacity or heating capacity provided by the equipment per unit time to the consumed electric power.

[0068] In the related art, liquid-cooled energy storage systems basically adopt a distributed liquid-cooling scheme, that is, a liquid chiller is configured in each energy storage container. However, due to the large number of devices in the distributed liquid-cooling unit, the probability of problems increases, and the required equipment cost is relatively high. The distributed liquid-cooling scheme has a problem of lower refrigeration efficiency compared with the centralized liquid-cooling scheme. Among them, the COP of the distributed liquid chiller is generally between 2.0 and 2.8, while the COP of the centralized liquid-cooling scheme is generally between 5 and 8. At present, the centralized liquid-cooling scheme has received less attention in the field of energy storage systems. The related technologies have adopted the centralized liquid-cooling scheme in data centers, but each energy storage unit needs to be configured with a CDU to achieve uniform distribution of the flow rate, thus increasing the cost and complexity of the system. And the related centralized liquid-cooling schemes all adopt three-stage heat exchange, that is, the chiller loop and the primary water loop (deionized water), the primary water loop and the secondary coolant (50% ethylene glycol + 50% water), and the secondary coolant and the energy storage unit, reducing the heat exchange efficiency.

[0069] Exemplarily, for example, the related centralized liquid-cooling scheme is configured to configure a set of coolant distribution units for each energy storage unit, increasing the equipment cost, and there is a lack of a scheme for uniform distribution of the flow rate for the scheme without configuring the coolant distribution units. In addition, the related centralized liquid-cooling scheme adopting three-stage heat exchange will reduce the heat exchange efficiency, and it is mainly achieved by controlling the total inlet and outlet water temperatures. Since it is difficult to obtain the actual heating power, it is difficult to accurately control the cooling capacity of the liquid-cooling unit. Therefore, under different cooling capacity demand conditions, the liquid-cooling unit operates at the maximum cooling capacity, making it difficult to achieve energy-saving and efficient operation of the system.

[0070] In view of this, in the embodiments of the present application, a centralized liquid-supply liquid-cooled energy storage power station and its control method are provided. The solution includes a centralized liquid-cooling unit, a control system, a pipeline system, a measurement system, and an energy storage system. Among them, the centralized liquid-cooling unit exchanges heat with the energy storage system through the pipeline system; the parameters of the centralized liquid-cooling unit are adjusted through the control system, and the flow rate of the energy storage system is distributed. Through the centralized liquid-cooling unit in the embodiments of the present application, the number and cost of devices can be reduced, and through the control system to adjust the parameters of the centralized liquid-cooling unit and distribute the flow rate of the energy storage system, accurate control can be achieved, and the operating efficiency of the liquid-cooling unit is improved.

[0071] To achieve the above object, on the one hand, an embodiment of the present application proposes a centralized liquid supply liquid-cooled energy storage power station, which includes: a centralized liquid-cooled unit, a control system, a pipeline system, a measurement system, and an energy storage system; the centralized liquid-cooled unit exchanges heat with the energy storage system through the pipeline system in a circulation manner, the measurement system is installed at the inlets and outlets of the centralized liquid-cooled unit and the energy storage system, and the control system is electrically connected to the centralized liquid-cooled unit;

[0072] Among them, the centralized liquid-cooled unit is used for secondary heat exchange with each energy storage unit in the energy storage system;

[0073] The control system is used for adjusting the parameters of the centralized liquid-cooled unit and distributing the flow rate of the energy storage system;

[0074] The pipeline system is used for connecting the centralized liquid-cooled unit and the energy storage system;

[0075] The measurement system is used for measuring the centralized liquid-cooled unit and the energy storage system;

[0076] The energy storage system is used for storing thermal energy.

[0077] In the embodiment of the present application, the centralized liquid supply liquid-cooled energy storage power station is composed of a centralized liquid-cooled unit, a control system, a pipeline system, a measurement system, and an energy storage system. A centralized liquid-cooled unit simultaneously provides coolant for multiple energy storage units in the energy storage system, so as to perform secondary heat exchange with each energy storage unit in the energy storage system. The control system is used for adjusting the parameters of the centralized liquid-cooled unit and distributing the flow rate of the energy storage system, so as to achieve precise control of the heat cycle without using a coolant distribution unit, which not only ensures the temperature control requirements of the energy storage unit, but also meets the efficient operation of the liquid-cooled unit. The pipeline system includes a primary water inlet main pipe, a primary water return main pipe, a secondary water inlet pipe, and a secondary water return pipe, which are used to connect the centralized liquid-cooled unit and the energy storage system to realize heat exchange circulation; the measurement system includes components such as a flow meter, a pressure sensor, and a temperature sensor, which are installed at the inlets and outlets of the centralized liquid-cooled unit and the energy storage system; the energy storage system includes multiple energy storage units, which are used for storing thermal energy. Refer to Figure 1 , Figure 1It is a schematic structural diagram of a centralized liquid-cooled energy storage power station provided by an embodiment of the present application. Among them, a set of centralized liquid-cooling units simultaneously provides coolant for 20 energy storage units. The power parameter of a single energy storage unit is 2.5 MW / 5 MWh. The rated cooling power of the centralized liquid-cooling unit reaches 1500 kW, and the total rated liquid supply volume is 9600 l / min. The energy storage units are arranged in two rows, with 10 sets of energy storage units in each row. The centralized liquid-cooling unit is placed in the middle position of one of the rows. The coolant flows out from the primary inlet main pipe (the thick solid line in the figure) of the centralized liquid-cooling unit, then flows to both sides of the centralized liquid-cooling unit respectively, and then flows into each energy storage unit through the secondary inlet pipes respectively. After exchanging heat with each energy storage unit, it flows out through the secondary return pipes and converges at the primary return main pipe, and finally returns to the centralized liquid-cooling unit to form a flowing cycle. In the embodiment of the present application, automatic flow regulating valves and temperature sensors are respectively arranged at the inlet and outlet positions of the centralized liquid-cooling unit and each energy storage unit, pressure sensors are respectively arranged at the inlet and outlet positions of the centralized liquid-cooling unit, a flow meter is arranged at the inlet position of the centralized liquid-cooling unit, and a flow meter is arranged at the outlet position of each energy storage unit. By using the centralized liquid-cooling unit to simultaneously provide coolant for multiple energy storage units in the energy storage system, the embodiment of the present application can reduce the number of devices, thereby improving the operation efficiency of the energy storage power station.

[0078] In some embodiments, the centralized liquid-cooling unit performs secondary heat exchange with each energy storage unit in the energy storage system through a secondary heat exchange circuit, and the secondary heat exchange circuit includes a refrigeration machine circuit and a secondary coolant circuit;

[0079] Among them, the refrigeration machine circuit forms a circulating circuit by a compressor, a condenser, an expansion valve, the primary side of a heat exchanger, and a storage tank;

[0080] The secondary coolant circuit forms a circulating circuit by the secondary side of the heat exchanger, a water pump, and the energy storage unit.

[0081] In the embodiment of the present application, the centralized liquid-cooling unit performs secondary heat exchange with each energy storage unit in the energy storage system through a secondary heat exchange circuit. The secondary heat exchange circuit includes a refrigeration machine circuit and a secondary coolant circuit. Refer to Figure 2 , Figure 2It is a schematic structural diagram of a secondary heat exchange circuit provided by an embodiment of the present application. Among them, the centralized liquid cooling system adopts secondary heat exchange, that is, the chiller circuit exchanges heat with the secondary coolant (50% ethylene glycol + 50% water), and the secondary coolant exchanges heat with the energy storage unit. Among them, the chiller circuit mainly consists of a condenser 201, an expansion valve 202, the primary side of a heat exchanger 203, a storage tank 204, a compressor 205, pipelines, sensors, etc. The secondary coolant circuit consists of a water pump 206, the secondary side of the heat exchanger 203, pipelines, sensors, etc. After the coolant and the refrigerant exchange heat in the heat exchanger, they directly enter the energy storage unit for heat exchange. In the related solution, the refrigerant and deionized water first exchange heat in the primary side heat exchanger, then the deionized water enters the CDU for secondary heat exchange with the coolant, and finally the coolant enters the energy storage unit for heat exchange. The centralized liquid cooling unit of the embodiment of the present application performs secondary heat exchange with each energy storage unit in the energy storage system through the secondary heat exchange circuit, reducing the intermediate heat exchange, thereby improving the heat exchange efficiency.

[0082] To achieve the above object, referring to Figure 3 , another aspect of the embodiment of the present application proposes a control method for a centralized liquid supply liquid cooling energy storage power station, which is applied to the centralized liquid supply liquid cooling energy storage power station as described above. The method includes the following steps:

[0083] Step S301, obtaining the state parameters of the energy storage system and the operating state of the centralized liquid cooling unit;

[0084] Step S302, performing regulation and control processing on the operating parameters of the centralized liquid cooling unit according to the state parameters of the energy storage system to obtain a parameter regulation strategy;

[0085] Step S303, performing distribution regulation and control processing on the flow rates of the respective energy storage units in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy.

[0086] In the embodiments of the present application, the control method of the centralized liquid supply liquid-cooled energy storage power station can be applied to the centralized liquid supply liquid-cooled energy storage power station described above. By obtaining the state parameters of the energy storage system and the operating status of the centralized liquid-cooled unit, the state parameters of the energy storage system include the number and location of the operating energy storage units, as well as the state of charge (SOC), temperature, charge and discharge rate, etc. of each energy storage unit. Specifically, in the initial startup and operation stage of the energy storage system, obtain the number and location of the energy storage units that need to operate this time. Under certain working conditions, not all 20 energy storage units work, and only some of them may operate, that is, determine which of the 20 energy storage units operate. By obtaining the state parameters of the energy storage single system, on the one hand, it is convenient to turn off the inlet and outlet valves of the non-operating energy storage units, and on the other hand, it is used to determine the number of battery cells n required for the calorific value. Then obtain the state parameters such as the SOC, temperature T, and charge and discharge rate R of the current energy storage unit. The operating status of the centralized liquid-cooled unit includes the pre-start stage, the initial operation stage, and the operation temperature control stage. Then, according to the state parameters of the energy storage system, the operating parameters of the centralized liquid-cooled unit are regulated to obtain a parameter regulation strategy; and according to the operating status of the centralized liquid-cooled unit, the flow rates of the individual energy storage units in the energy storage system are distributed and regulated to obtain a flow regulation strategy. The embodiments of the present application regulate the centralized liquid supply liquid-cooled energy storage power station through the parameter regulation strategy and the flow regulation strategy, thereby improving the operating efficiency of the centralized liquid supply liquid-cooled energy storage power station.

[0087] Referring to Figure 4 , in some embodiments, the regulating and processing the operating parameters of the centralized liquid-cooled unit according to the state parameters of the energy storage system to obtain a parameter regulation strategy includes the following steps:

[0088] Step S401, obtain the number of operating energy storage units in the energy storage system;

[0089] Step S402, calculate the total heat generation power according to the number of operations and the state parameters to obtain the total heat generation power;

[0090] Step S403, calculate the refrigeration power and the total coolant flow rate according to the total heat generation power;

[0091] Step S404, regulate the working parameters of the refrigerator according to the refrigeration power, and regulate the pump speed according to the total coolant flow rate to obtain a parameter regulation strategy.

[0092] In the embodiments of the present application, the number of operating energy storage units in the energy storage system is obtained, and then the heat generation power is calculated based on the number of operations and the state parameters. It should be noted that in the present application, first, the heat generation power data q(SOC, T, R) of all battery cells in the energy storage system under different state of charge (SOC), different temperatures T, and different charge and discharge rates R is established, and a MAP data is constructed. The MAP data is key-value pair data and can find the corresponding heat generation power data according to different SOC, temperature T, and charge and discharge rate R. Among them, the heat generation power data can be obtained through experimental tests or calculated through the heat generation power calculation formula. The heat generation power calculation formula is as follows:

[0093]

[0094] Where I is the current, positive for charging and negative for discharging; Ri(SOC, T) is the internal resistance of the battery cell, obtained through experimental measurement, and interpolation through a program lookup table is required during calculation; T is the temperature of the battery cell; is the entropy change coefficient.

[0095] Then, the total heat generation power Q1 is calculated according to the total heat generation power calculation formula. The total heat generation power calculation formula is as follows:

[0096] Q1 = q(SOC, T, R) ⋅ n;

[0097] In the formula, Q1 represents the total heat generation power, q(SOC, T, R) represents the heat generation power data, and n represents the number of battery cells. The cooling power and the total coolant flow rate can be calculated based on the calculated total heat generation power. Finally, the operating parameters of the chiller are regulated according to the cooling power, and the pump speed is regulated according to the total coolant flow rate to obtain the parameter regulation strategy. Specifically, the parameter regulation strategy mainly includes adjusting 1) the cooling power and the total liquid supply volume of the centralized liquid cooling unit. The regulation of the cooling power mainly ensures that the cooling capacity of the liquid cooling unit meets the heat dissipation power requirements of the energy storage unit, and the parameters to be regulated are mainly the compressor speed, the speed of the cooling fan, etc. The regulation of the total liquid supply volume mainly ensures sufficient heat exchange with the energy storage unit to ensure that the heat of the energy storage unit is taken away, and the main regulation parameter is the pump speed. By regulating the operating parameters of the centralized liquid cooling unit in the embodiments of the present application to obtain the parameter regulation strategy, it can ensure that the cooling capacity of the liquid cooling unit meets the heat dissipation power requirements of the energy storage unit, accurately obtain the total heat generation power of the heat source at the initial stage of the operation of the liquid cooling system, so as to achieve precise control of the cooling capacity and the liquid supply flow rate, which not only ensures the temperature control requirements of the energy storage unit but also meets the efficient operation of the liquid cooling unit.

[0098] In some embodiments, calculating the cooling power and the total coolant flow rate according to the total heat generation power includes the following steps:

[0099] Obtain the temperature rise rate of the battery cell and the temperature difference between the inlet water temperature of the coolant.

[0100] Calculate the total heat absorption power of the battery cell based on the temperature rise rate of the battery cell.

[0101] Calculate the refrigeration power based on the total heat generation power and the total heat absorption power of the battery cell.

[0102] Calculate the total coolant flow rate based on the total heat generation power and the temperature difference between the inlet water temperature of the coolant.

[0103] In the embodiment of the present application, the temperature rise rate of the battery cell is preset as ΔTu in the control program, and the temperature difference between the total return water and the total inlet water temperature of the coolant is ΔT1. Then, calculate the total heat absorption power of the battery cell based on the temperature rise rate of the battery cell and the temperature difference between the inlet water temperature of the coolant. The total heat absorption power Q of the battery cell cell The calculation formula is as follows:

[0104] ΔTu = ΔT / t;

[0105] q cell = Q / t = C cell ﹒m cell ﹒ΔTu;

[0106] Q cell = q cell ﹒n;

[0107] Among them, q cell is the heat absorption power of the battery cell, Q is the heat absorption amount of the battery cell, t is the time, C cell is the specific heat of the battery cell, m cell is the mass of the battery cell, ΔT is the temperature rise of the battery cell, Q cell is the total heat absorption power of the battery cells in the operating energy storage unit. t is generally selected as 2h, that is, the duration when the battery cells charge and discharge at a 0.5C rate and the SOC rises from 0% to 100%. ΔT is generally selected as 3 to 8°C, preferably 5°C.

[0108] Then, calculate the refrigeration power Q2 based on the total heat generation power and the temperature difference between the inlet water temperature of the coolant. The calculation formula of the refrigeration power is as follows:

[0109] Q2 = (Q1 - Q cell )﹒k;

[0110] Among them, k is the safety factor, generally taken as 1.05 to 1.2, preferably 1.1.

[0111] Based on the determined refrigeration power, parameters such as the compressor speed and the fan speed can be adjusted and controlled by the refrigeration control system. Then, the total coolant flow rate is calculated based on the total heat generation power and the coolant inlet temperature difference. The total inlet temperature difference ΔT1 is generally selected to be 2 - 5°C, preferably 3°C, so that the required total coolant flow rate M can be determined. The formula for calculating the total coolant flow rate is as follows:

[0112] M = Q1 / (CM﹒ΔT1);

[0113] where CM is the specific heat capacity of the coolant. Then, the water pump speed is adjusted and controlled based on the total coolant flow rate. By adjusting the parameters of the centralized liquid cooling unit in the embodiments of the present application, precise control of the refrigeration capacity and the liquid supply flow rate can be achieved, improving the operating efficiency of the system.

[0114] In some embodiments, regulating the operating parameters of the refrigerator according to the refrigeration power and regulating the water pump speed according to the total coolant flow rate to obtain a parameter regulation strategy includes the following steps:

[0115] Regulating the operating parameters of the refrigerator according to the refrigeration power and regulating the water pump speed according to the total coolant flow rate to obtain a regulation parameter set;

[0116] Performing an update process on the refrigeration power and the total coolant flow rate based on a parameter update period to obtain an update change rate;

[0117] Adjusting the regulation parameter set according to the update change rate to obtain a parameter regulation strategy.

[0118] In the embodiments of the present application, by regulating the operating parameters of the refrigerator and the rotational speed of the water pump, a corresponding set of regulation parameters can be obtained. Since the parameters SOC, temperature T, and charge-discharge rate R change in real time during the operation of the battery cells, the heat generation power also changes in real time. Therefore, it is necessary to update and regulate the refrigeration power and the total liquid supply volume. In the embodiments of the present application, the update period of the required parameters is set to 1 to 5 minutes, preferably 2 minutes, that is, recalculated every 2 minutes to obtain new data, so as to determine the total heat generation power Q1 of the energy storage system and the initial set battery cell temperature rise rate ΔTu according to the current operating time, and determine the total coolant flow rate M and the required refrigeration power Q2. After running for 2 minutes, the average battery cell temperature rise rate ΔTu' is measured, and the total heat generation power Q1', total coolant flow rate M', and required refrigeration power Q2' of the energy storage system are recalculated and determined. Then, the set of regulation parameters is adjusted according to the update change rate to obtain a parameter regulation strategy. Specifically, for the re-evaluated Q1', if the condition: |(Q2' - Q2) / Q2| ≥ 5% is met, the parameters such as the control compressor speed and the fan speed are readjusted. For example, if Q2' > Q2, the compressor speed and the fan speed need to be increased to increase the refrigeration power; if Q2' < Q2, the compressor speed and the fan speed are decreased to reduce the refrigeration power.

[0119] Similarly, the total required coolant flow rate M' is re-evaluated. If the condition: |(M' - M) / M| ≥ 5% is met, the water-cooling speed is readjusted to adjust the total coolant flow rate. If M' > M, the water pump speed needs to be increased to increase the liquid supply volume; if M' < M, the water pump speed is decreased to reduce the liquid supply volume. Based on the measured average battery cell temperature rise rate ΔTu', if the condition |(ΔTu' - ΔTu) / ΔTu| ≥ 5% is met, the safety factor k used to calculate the refrigeration power is readjusted, thereby adjusting the required refrigeration power value. The embodiments of the present application obtain a more accurate and real-time parameter regulation strategy by updating and adjusting the set of regulation parameters, which can better regulate the parameters of the centralized liquid cooling unit, achieve sufficient heat exchange with the energy storage unit, and improve the operating efficiency of the system.

[0120] In some embodiments, the flow rate of each energy storage unit in the energy storage system is allocated and regulated according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy, including the following steps:

[0121] When the operating state of the centralized liquid cooling unit is before the centralized liquid cooling unit starts, open the return pipe valve of the centralized liquid cooling unit, and then open the primary inlet pipe valve;

[0122] Adjust the opening degree of the inlet pipe valve of the energy storage unit according to the distance of the primary inlet pipe to obtain a flow rate regulation strategy.

[0123] In some embodiments, when the operating state of the liquid-cooled centralized liquid-cooling unit is before the centralized liquid-cooling unit starts, the opening degree of the water inlet pipeline valve of the energy storage unit is adjusted according to the distance of the primary water inlet pipeline. Specifically, referring to Figure 5 , first fully open all the water return pipeline valves, then open the primary water inlet pipeline valve, and then adjust the water inlet pipeline valves of each energy storage unit. The opening degrees are sequentially controlled between 100% and 80% from far to near along the primary pipeline. Among them, it is assumed that energy storage units 1, 6, 15, and 20 are the farthest units along the pipeline, and the initial valve opening degree is 100%. Energy storage units 5, 10, 11, and 16 are the nearest units along the pipeline, and the initial valve opening degree is 80%. The rest can be adjusted according to the difference, and then start the liquid-cooling unit. By adjusting the water inlet pipeline valves of the energy storage units according to the distance of the primary water inlet pipeline in the embodiments of the present application, the flow distribution efficiency of the energy storage units can be improved.

[0124] In some embodiments, the step of performing flow distribution regulation processing on the flows of the respective energy storage units in the energy storage system according to the operating state of the centralized liquid-cooling unit to obtain a flow regulation strategy further includes the following steps:

[0125] When the operating state of the centralized liquid-cooling unit is the initial operating stage, collect the flows of the respective energy storage units in the energy storage system to obtain a flow set;

[0126] Obtain the maximum flow from the flow set, and perform difference calculation processing on the flow set according to the maximum flow to obtain a difference set;

[0127] Adjust the opening degrees of the water inlet pipeline valves of the respective energy storage units in the energy storage system according to the difference set to obtain a flow regulation strategy.

[0128] In the embodiments of the present application, referring to Figure 6 , when the operating state of the centralized liquid-cooling unit is the initial operating stage, collect the flows of the respective energy storage units in the energy storage system to obtain a flow set, which includes (Mo1, Mo2, …… Mon), where Mo1 is the coolant flow rate entering the No. 1 energy storage unit, and Mon is the coolant flow rate entering the No. n energy storage unit. Then obtain the maximum flow from the flow set, and calculate the flow difference ΔM between each energy storage unit and it based on the maximum flow Mon i to obtain a difference set. The calculation formula of the difference set is as follows:

[0129] Energy storage unit 1: ΔM1 = Moi - Mo1;

[0130] Energy storage unit 2: ΔM2 = Moi - Mo2;

[0131] Energy storage unit n: ΔMn = Moi - Mon;

[0132] Wherein, Moi = max{Mo1, Mo2, …… Mon}. Then keep the inlet valve of the energy storage unit farthest from the tube side fully open, and adjust the opening degree of the water inlet valves of the remaining energy storage units so that ΔM ≈ 0. By regulating the flow rate of the energy storage units at the initial stage of operation in this embodiment of the application, it is possible to regulate the flow rate without using a coolant distribution unit, reduce equipment costs, and improve the operating efficiency of the system.

[0133] In some embodiments, the step of allocating and regulating the flow rates of the respective energy storage units in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow rate regulation strategy further includes the following steps:

[0134] When the operating state of the centralized liquid cooling unit is the operating temperature control stage, collect the temperatures of the respective energy storage units in the energy storage system to obtain a temperature set;

[0135] Analyze and process the temperature set according to a preset temperature relationship formula to obtain an analysis result;

[0136] Adjust the opening degrees of the inlet pipeline valves of the respective energy storage units in the energy storage system according to the analysis result to obtain a flow rate regulation strategy.

[0137] In the embodiment of the present application, referring to Figure 7 , when the operating state of the centralized liquid cooling unit is the operating temperature control stage, also collect the temperatures of the respective energy storage units in the energy storage system to obtain a temperature set, and then analyze each energy storage unit according to the temperature set to determine whether the opening degree of the water inlet valve needs to be adjusted, so as to obtain a flow rate regulation strategy.

[0138] In some embodiments, the step of analyzing and processing the temperature set according to a preset temperature relationship formula to obtain an analysis result includes the following steps:

[0139] Determine the highest temperature and average temperature of each energy storage unit according to the temperature set;

[0140] When the highest temperature or average temperature of the energy storage unit conforms to the temperature relationship formula, determine the analysis result as to perform flow regulation on the energy storage unit.

[0141] In the embodiment of the present application, specifically, first collect the highest temperature Tmax and average temperature Tavg of each energy storage unit, and then analyze the collected temperature data. If there are the following conditions:

[0142] Tmaxi – min{Tmax1, Tmax2, …… Tmaxn} ≥ 5°C;

[0143] or Tavgi – min{Tavg1, Tavg2, …… Tavgn} ≥ 3°C;

[0144] Wherein, Tmaxi is the maximum temperature of the i-th energy storage unit, and Tavgi is the average temperature of the i-th energy storage unit. Then, the opening of the inlet valve of the corresponding i-th energy storage unit is increased by 3% - 5%. If the valve opening has reached 100%, then for the energy storage unit with a lower temperature, the opening of the inlet valve is decreased by 3% - 5%. After each adjustment, it runs for 3 - 8 min and then makes the next determination. The preferred running time is 5 min. If the above temperature relationship still exists, then continue the next adjustment. If there are the following conditions:

[0145] Tmaxi – min{Tmax1, Tmax2, …… Tmaxn} < 3°C;

[0146] or Tavgi – min{Tavg1, Tavg2, …… Tavgn} < 2°C;

[0147] Then maintain the current state and continue to run, and continue to collect the maximum temperature Tmax and average temperature Tavg of each energy storage unit, and then analyze the collected temperature data. Through the operation status of the centralized liquid cooling unit, the flow rate of each energy storage unit in the energy storage system is distributed and regulated to obtain a flow rate regulation strategy. The present application embodiment can simplify the architecture of the liquid cooling system and reduce the system cost without the need to distribute the flow rate through an intermediate coolant distribution unit.

[0148] Next, combined with specific application examples, the solution of the embodiment of the present application will be introduced and described in detail:

[0149] The embodiments of the present application can be applied to fields such as new energy power stations, microgrids, charging pile energy storage, power batteries and the grid side, data centers, and new energy vehicle swapping stations. Through the centralized liquid supply liquid-cooled energy storage power station of the embodiments of the present application, the overall energy storage thermal management efficiency can be greatly improved, and the auxiliary energy consumption can be greatly reduced. Among them, the centralized liquid-cooling unit of the embodiments of the present application performs secondary heat exchange with each energy storage unit in the energy storage system through a secondary heat exchange loop, that is, through the chiller loop to exchange heat with the secondary coolant (50% ethylene glycol + 50% water), and the secondary coolant exchanges heat with the energy storage unit. Compared with the 3-stage heat exchange in the related art, the heat exchange efficiency is greatly improved. In addition, the embodiments of the present application obtain a parameter regulation strategy by regulating the operating parameters of the centralized liquid-cooling unit, and perform flow distribution regulation on the flow rates of the respective energy storage units in the energy storage system according to the operating state of the centralized liquid-cooling unit to obtain a flow regulation strategy. It can couple the regulation of the centralized liquid-cooling unit with the core heating power parameter, accurately learn the total heating power of the heat source at the initial stage of the operation of the liquid-cooling system, so as to realize the precise control of the cooling capacity and the liquid supply flow rate, which not only ensures the temperature control requirements of the energy storage unit, but also meets the efficient operation of the liquid-cooling unit, and there is no need to perform flow distribution through an intermediate coolant distribution unit, thereby simplifying the architecture of the liquid-cooling system and reducing the cost of the system.

[0150] The embodiments of the present application also provide a control device, which can implement the control method of the above-mentioned centralized liquid supply liquid-cooled energy storage power station. The device includes:

[0151] A first module, configured to obtain the state parameters of the energy storage system and the operating state of the centralized liquid-cooling unit;

[0152] A second module, configured to perform regulation processing on the operating parameters of the centralized liquid-cooling unit according to the state parameters of the energy storage system to obtain a parameter regulation strategy;

[0153] A third module, configured to perform flow distribution regulation on the flow rates of the respective energy storage units in the energy storage system according to the operating state of the centralized liquid-cooling unit to obtain a flow regulation strategy.

[0154] It can be understood that the content in the above method embodiments is applicable to the device embodiments of the present application. The functions specifically implemented by the device embodiments of the present application are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0155] The embodiments of the present application also provide an electronic device. The electronic device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the control method of the above-mentioned centralized liquid supply liquid-cooled energy storage power station. The electronic device can be any intelligent terminal including a tablet computer, an in-vehicle computer, etc.

[0156] It can be understood that the content in the above method embodiments is applicable to the device embodiments of the present application. The functions specifically implemented by the device embodiments of the present application are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those of the above method embodiments.

[0157] The embodiments of the present application also provide a computer-readable storage medium storing a computer program, which when executed by a processor implements the control method of the above centralized liquid supply liquid-cooled energy storage power station.

[0158] It can be understood that the content in the above method embodiments is applicable to the storage medium embodiments of the present application. The functions specifically implemented by the storage medium embodiments of the present application are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those of the above method embodiments.

[0159] As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory may optionally include memories remotely disposed relative to the processor, and these remote memories can be connected to the processor through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0160] A centralized liquid supply liquid-cooled energy storage power station and its control method provided by the embodiments of the present application. The solution includes a centralized liquid-cooling unit, a control system, a pipeline system, a measurement system, and an energy storage system. Among them, the centralized liquid-cooling unit exchanges heat with the energy storage system through the pipeline system; the parameters of the centralized liquid-cooling unit are adjusted through the control system, and the flow rate of the energy storage system is distributed. Through the centralized liquid-cooling unit in the embodiments of the present application, the number of devices and costs can be reduced, and through the control system to adjust the parameters of the centralized liquid-cooling unit and distribute the flow rate of the energy storage system, precise control can be achieved, and the operating efficiency of the liquid-cooling unit is improved.

[0161] The embodiments described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0162] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than those shown in the figures, or combine some steps, or different steps.

[0163] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0164] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations.

[0165] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0166] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or a similar expression means any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0167] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0168] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0169] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0170] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store programs.

[0171] The preferred embodiments of the embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of rights of the embodiments of the present application. Any modifications, equivalent replacements, and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall be within the scope of rights of the embodiments of the present application.

Claims

1. A control method for a centralized liquid supply and liquid cooling energy storage power station, characterized in that: The method comprises the following steps: Obtaining the state parameters of the energy storage system and the operating state of the centralized liquid cooling unit; the state parameters include at least the number and location of the operating energy storage units, and the charge state, temperature, and charge and discharge rate of each energy storage unit; the operating state includes the pre-startup stage, the operation start stage, and the operation temperature control stage; Regulating and processing the operating parameters of the centralized liquid cooling unit according to the state parameters of the energy storage system to obtain a parameter regulation strategy; According to the operating status of the centralized liquid cooling unit, the flow of each energy storage unit in the energy storage system is distributed and regulated to obtain a flow control strategy; The step of regulating and processing the operating parameters of the centralized liquid cooling unit according to the state parameters of the energy storage system to obtain a parameter regulation strategy comprises the following steps: Obtaining the operating quantity of energy storage units in the energy storage system; Calculate the heating power according to the running quantity and the state parameter to obtain the total heating power; Calculate the cooling power and the total flow rate of the coolant according to the total heating power; The operating parameters of the refrigerator are regulated according to the refrigeration power, and the speed of the water pump is regulated according to the total flow rate of the coolant to obtain a parameter regulation strategy; The method of regulating the working parameters of the refrigerator according to the refrigeration power and regulating the speed of the water pump according to the total flow rate of the coolant to obtain a parameter regulation strategy includes the following steps: The operating parameters of the refrigerator are regulated according to the refrigeration power, and the speed of the water pump is regulated according to the total flow rate of the coolant to obtain a set of regulation parameters; Based on a parameter update cycle, the refrigeration power and the total flow rate of the coolant are updated to obtain an update change rate; The control parameter set is adjusted according to the update change rate to obtain a parameter control strategy.

2. The method according to claim 1, characterized in that The step of calculating the cooling power and the total flow rate of the coolant according to the total heating power comprises the following steps: Obtain the battery cell heating rate and coolant inlet temperature difference; The total heat absorption power of the battery cell is calculated according to the heating rate of the battery cell; Calculate the cooling power according to the total heat generation power and the total heat absorption power of the battery core; The total coolant flow rate is calculated based on the total heating power and the coolant inlet temperature difference.

3. The method according to claim 1, characterized in that The method of distributing and regulating the flow of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow regulation strategy includes the following steps: When the operation state of the centralized liquid cooling unit is before the centralized liquid cooling unit is started, the return water pipeline valve of the centralized liquid cooling unit is opened, and then the first-level water inlet pipeline valve is opened; The opening of the water inlet pipeline valve of the energy storage unit is adjusted according to the distance of the primary water inlet pipeline to obtain a flow control strategy.

4. The method according to claim 1, characterized in that The method of distributing and regulating the flow of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow control strategy also includes the following steps: When the operation state of the centralized liquid cooling unit is in the initial operation stage, the flow of each energy storage unit in the energy storage system is collected to obtain a flow set; Obtaining a maximum flow from the flow set, and performing difference calculation processing on the flow set according to the maximum flow to obtain a difference set; The opening of the water inlet pipeline valve of each energy storage unit in the energy storage system is adjusted according to the difference set to obtain a flow control strategy.

5. The method according to claim 1, characterized in that The method of distributing and regulating the flow of each energy storage unit in the energy storage system according to the operating state of the centralized liquid cooling unit to obtain a flow control strategy also includes the following steps: When the operation state of the centralized liquid cooling unit is the operation temperature control stage, the temperature of each energy storage unit in the energy storage system is collected to obtain a temperature set; Analyze and process the temperature set according to a preset temperature relationship formula to obtain an analysis result; According to the analysis result, the opening of the water inlet pipeline valve of each energy storage unit in the energy storage system is adjusted to obtain a flow control strategy.

6. The method according to claim 5, characterized in that The step of analyzing and processing the temperature set according to a preset temperature relationship formula to obtain an analysis result comprises the following steps: Determine the maximum temperature and average temperature of each energy storage unit according to the temperature set; When the maximum temperature or the average temperature of the energy storage unit meets the temperature relationship formula, the analysis result is determined to be flow regulation for the energy storage unit.

Images