Centralized heat storage device and temperature adjusting system of flow battery energy storage power station

Abstract

The invention relates to a centralized heat storage device and a temperature adjusting system of a flow battery energy storage power station. The method comprises the steps that the source heat medium storage and supply system stores a source heat medium for heating an electrolyte or is used for storing a source heat medium for cooling the electrolyte; the waste heat medium storage and supply system is used for storing the waste heat medium after the electrolyte is heated or storing the waste heat medium after the electrolyte is cooled; the source heat medium storage and supply system heats or cools electrolyte in the at least one electrolyte storage tank, and the waste heat medium storage and supply system is used for storing waste heat media obtained after the electrolyte in the at least one electrolyte storage tank is heated or cooled. And the waste heat medium recovery system heats or cools the waste heat medium output by the waste heat medium storage and supply system, and transmits the heated or cooled waste heat medium to at least one source heat medium storage tank. By adopting the method, the reliability of the whole energy storage power station system can be improved, and the management and maintenance cost of equipment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of liquid flow battery energy storage, and in particular to a centralized heat storage device and a temperature regulation system for a liquid flow battery energy storage power station. Background Art

[0002] Compared with other energy storage methods, flow battery energy storage device systems have many advantages such as high safety, long cycle life, and the ability to store unstable energy from photovoltaics, wind power, etc. In addition, due to the needs of the "dual carbon" goals, green energy, and energy strategies, flow battery energy storage systems are receiving more and more attention. With the advancement of new energy strategies, the construction scale of flow battery energy storage device systems will continue to expand: from one or more scattered flow battery energy storage devices to large-scale energy storage power stations composed of many flow battery energy storage devices. During the operation of the flow battery energy storage device, the electrolyte used in it usually needs to be controlled within a certain process temperature range; according to the process requirements of the specific flow battery energy storage device, the electrolyte needs to be heated or cooled.

[0003] When there are a small number of flow battery energy storage devices in an area, due to the economic issues of equipment investment, it is generally considered to directly heat or cool the electrolyte in each tank separately. However, for large-scale energy storage systems such as independent energy storage power stations, which include multiple flow battery energy storage devices with multiple electrolyte storage tanks, the decentralized temperature control method of heating or cooling the electrolyte in each tank separately is not an ideal solution.

[0004] Specifically, when the number of energy storage devices in an independent energy storage power station is large, that is, the number of electrolyte storage tanks is large, the decentralized temperature control that directly heats or cools the electrolyte in each tank individually will increase the frequency of failures due to the increase in the number of related equipment, thereby reducing the reliability of the entire energy storage power station system and increasing the management and maintenance costs of the equipment. Summary of the invention

[0005] Based on this, it is necessary to provide a centralized heat storage device and temperature control system for a flow battery energy storage power station that can improve the reliability of the entire energy storage power station system and reduce the management and maintenance costs of the equipment to address the above technical problems.

[0006] In a first aspect, the present application provides a centralized heat storage device for a flow battery energy storage power station, the device comprising:

[0007] A source heat medium storage and supply system, used to store and provide a source heat medium for heating or cooling the electrolyte in at least one electrolyte storage tank, the source heat medium storage and supply system comprising a plurality of source heat medium storage tanks connected in parallel;

[0008] A waste heat medium storage and supply system, used to store waste heat medium after heating at least one of the electrolytes or to store waste heat medium after cooling the electrolyte, the waste heat medium storage and supply system comprising a plurality of waste heat medium storage tanks connected in parallel;

[0009] The heat medium before heat exchange with the electrolyte is called source heat medium, and the heat medium after heat exchange with the electrolyte is called waste heat medium;

[0010] A waste heat medium recovery system is used to heat or cool the waste heat medium output by the waste heat medium storage and supply system, and transmit the heated or cooled waste heat medium to at least one source heat medium storage tank of the source heat medium storage and supply system.

[0011] In one embodiment, the source heat medium storage and supply system further comprises:

[0012] The source heat medium output branch includes a first temperature sensor and a first liquid level measuring device. When the temperature measured by the first temperature sensor meets the first temperature requirement and the amount of the source heat medium measured by the first liquid level measuring device meets the first surplus requirement, the source heat medium is output to the electrolyte storage and temperature control system.

[0013] In one embodiment, the source heat medium output branch further includes a source heat medium first output branch, a source heat medium second output branch, a source heat medium third output branch, and a source heat medium fourth output branch;

[0014] The centralized heat storage device further comprises: a first source heat medium circuit, a second source heat medium circuit and a third source heat medium circuit, wherein the output end of the first source heat medium circuit, the output end of the second source heat medium circuit and the output end of the third source heat medium circuit are all connected to each of the source heat medium storage tanks;

[0015] Wherein, the output end of the first output branch of the source heat medium is respectively connected to the input end of the second output branch of the source heat medium and the input end of the first circuit of the source heat medium, the output end of the second output branch of the source heat medium, the input end of the third output branch of the source heat medium and the input end of the second circuit of the source heat medium are connected through a three-way valve, the output end of the third output branch of the source heat medium, the input end of the fourth output branch of the source heat medium and the input end of the third circuit of the source heat medium are connected, and the output end of the fourth output branch of the source heat medium outputs the electrolyte to the electrolyte storage and temperature control system;

[0016] Wherein, the first source heat medium circuit is used to return part of the source heat medium to the source heat medium storage tank based on a first proportional regulating valve controlled by a control system;

[0017] The second source heat medium circuit is used to output the source heat medium to the waste heat medium recovery system for heating when it is detected that the temperature of the source heat medium outputted from the second output branch of the source heat medium does not meet the first temperature requirement, and to reflux the source heat medium to the source heat medium storage tank when the temperature of the heated source heat medium still does not meet the first temperature requirement, and to output the heated source heat medium to the input end of the fourth output branch of the source heat medium through the third source heat medium circuit when the temperature of the heated source heat medium meets the first temperature requirement;

[0018] The source heat medium third circuit is used to return part of the source heat medium to the source heat medium storage tank based on a second proportional regulating valve controlled by a control system.

[0019] In one of the embodiments, the waste heat medium recovery system includes a first heat exchange branch and a second heat exchange branch;

[0020] Wherein, when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air meets the requirements, the waste heat medium is temperature-regulated by using the ambient air through the first heat exchange branch, and / or the waste heat medium is temperature-regulated by connecting the second heat exchange branch in series; when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air does not meet the requirements, the waste heat medium is temperature-regulated by the second heat exchange branch;

[0021] The second heat exchange branch includes a heat source device, and the heat source device includes an electric heat exchange device and other energy heat exchange devices. The priority of the other energy heat exchange devices is higher than that of the electric heat exchange device. The other energy heat exchange devices include at least one of a heat pump heater, a solar heater, and a heat pump refrigerator; and the use priority of the electric heat exchange device in the valley electricity stage is higher than that in the peak electricity stage.

[0022] In one embodiment, the first heat exchange branch comprises:

[0023] a flow measurement module, used for measuring the flow of waste heat medium flowing out of the waste heat medium storage and supply system, and opening a large flow branch when the waste heat medium flow is greater than or equal to a flow threshold, wherein the large flow branch and the initial flow branch are parallel branches, and when the waste heat medium flow is less than the flow threshold, controlling and adjusting the waste heat medium flow of the initial flow branch based on a control system;

[0024] The target heat exchanger is used to perform heat exchange between the air and the waste heat medium by forced convection to adjust the temperature of the waste heat medium.

[0025] In one embodiment, the second heat exchange branch includes a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are both connected in parallel with the heat source device, the first heat exchanger is used to regulate the temperature of the waste heat medium output by the waste heat medium storage and supply system, and the second heat exchanger is used to regulate the temperature of the source heat medium returning in the source heat medium storage and supply system.

[0026] In one of the embodiments, the waste heat medium storage and supply system further includes: a first waste heat medium output branch, a second waste heat medium output branch, and a waste heat medium loop;

[0027] The input end of the first output branch of the waste heat medium is connected to the output end of each of the waste heat medium storage tanks, the output end of the first output branch of the waste heat medium is connected to the input end of the second output branch of the waste heat medium and the input end of the waste heat medium circuit, the output end of the waste heat medium circuit is connected to the first input end of the waste heat medium storage and supply system, and the output end of the second output branch of the waste heat medium is connected to the input end of the waste heat medium recovery system;

[0028] The first waste heat medium output branch includes a second temperature sensor and a second liquid level measuring device, and when the temperature measured by the second temperature sensor meets the second temperature requirement and the waste heat medium quantity measured by the second liquid level measuring device meets the second surplus quantity requirement, the waste heat medium is output to the second waste heat medium output branch and the waste heat medium circuit;

[0029] The waste heat medium circuit is used to perform flow regulation based on the control of the control system to adjust the amount of waste heat medium flowing back to the waste heat medium storage tank.

[0030] In a second aspect, the present application also provides a temperature regulation system for a flow battery energy storage power station, comprising:

[0031] The centralized heat storage device of the above-mentioned liquid flow battery energy storage power station; and

[0032] An electrolyte storage and temperature control system, wherein the input end of the electrolyte storage and temperature control system is connected to the output end of the source heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station, and the first output end of the electrolyte storage and temperature control system is connected to the second input end of the waste heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station;

[0033] The centralized heat storage device is used to heat or cool the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system, and the waste heat medium storage and supply system is used to store the waste heat medium after heating or cooling the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system.

[0034] In one of the embodiments, the electrolyte storage and temperature control system includes at least one heat exchange branch and a confluence branch;

[0035] Each of the heat exchange branches comprises an electrolyte storage tank, a heat exchange device and a flow regulating valve based on a control system, wherein the flow regulating valve is used to regulate the flow of the source heat medium in the heat exchange device flowing to the electrolyte storage tank, wherein the source heat medium in the heat exchange device is used to perform heat exchange with the electrolyte in the electrolyte storage tank;

[0036] The merging branch is used to merge the waste heat medium flowing out of each of the heat exchange branches and input the waste heat medium into the waste heat medium storage and supply system.

[0037] In one embodiment, the electrolyte storage and temperature control system also includes a source heat medium shunt branch and a source heat medium fourth loop, the input end of the source heat medium shunt branch is the input end of the electrolyte storage and temperature control system, each first output end of the source heat medium shunt branch is connected to the input end of each heat exchange branch in a one-to-one correspondence, the second output end of the source heat medium shunt branch is connected to the input end of the source heat medium fourth loop, the output end of the source heat medium fourth loop is connected to the input end of the source heat medium storage and supply system, the output end of the source heat medium fourth loop is the second output end of the electrolyte storage and temperature control system, and the source heat medium fourth loop is used to return excess source heat medium to the source heat medium storage and supply system.

[0038] The centralized heat storage device and temperature control system of the above-mentioned liquid flow battery energy storage power station include a source heat medium storage and supply system, a waste heat medium storage and supply system and a waste heat medium recovery system. The source heat medium storage and supply system includes a plurality of parallel source heat medium storage tanks, and the waste heat medium storage and supply system includes a plurality of parallel waste heat medium storage tanks, so that the source heat medium storage and supply system is used to store and provide source heat medium for heating or cooling the electrolyte in at least one electrolyte storage tank, the waste heat medium storage and supply system is used to store the waste heat medium after heating or cooling the electrolyte in at least one electrolyte storage tank, and the waste heat medium recovery system is used to heat or cool the waste heat medium output by the waste heat medium storage and supply system, and transmit the heated or cooled waste heat medium to at least one source heat medium storage tank of the source heat medium storage and supply system, thereby realizing a one-to-many function, which can improve the reliability of the entire energy storage power station system and reduce the management and maintenance costs of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a schematic diagram of a temperature regulation system of a flow battery energy storage power station in one embodiment;

[0041] Figure 2 is a control flow chart of a source heat medium storage and supply system in one embodiment;

[0042] Figure 3 A control flow chart of an electrolyte storage and temperature control system and a waste heat medium storage and supply system in one embodiment;

[0043] Figure 4 is a control flow chart of a waste heat medium recovery system in one embodiment;

[0044] Figure 5 is a control flow chart of a source heat medium storage and supply system in another embodiment;

[0045] Figure 6 A control flow chart of an electrolyte storage and temperature control system and a waste heat medium storage and supply system in another embodiment;

[0046] Figure 7 FIG. 4 is a control flow chart of a waste heat medium recovery system in another embodiment. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0048] For ease of understanding, the professional terms involved in this application are explained as follows:

[0049] RFB: Redox Flow Battery, redox flow battery, abbreviated as flow battery.

[0050] PFD: Process Flow Diagram, process flow diagram.

[0051] P&ID: Piping and Instrumentation Diagram, piping and instrumentation flow chart.

[0052] PLC or DCS: Programmable Logic Controller or Distributed Control System, programmable logic controller or distributed control system.

[0053] PID: Proportion Integration Differentiation, a computational control method for a process.

[0054] TES: Thermal Energy Storage, thermal storage or thermal energy storage, including: storage of high temperature medium (heat) and storage of low temperature medium (cold). A technology that stores thermal energy by heating or cooling the storage medium so that the stored energy can be used later for heating or cooling processes, etc.

[0055] Thermal Media, thermal medium or heat storage medium or heat carrier. In the field of thermal energy storage technology, it is a material used to store heat.

[0056] EE: Energy Efficiency. In energy utilization, the ratio of the amount of energy that is used to the amount of energy actually consumed.

[0057] Heat Pump: A highly efficient and energy-saving device that fully utilizes low-grade thermal energy. It is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It consumes only a small amount of reverse cycle net work to obtain a large amount of heat supply. It can effectively utilize the low-grade thermal energy that is difficult to use and achieve energy saving.

[0058] Electric heater: It is an electric heating device. Electric heating is the process of converting electrical energy into thermal energy. Compared with heat pump heating, direct electric heating is less efficient; and heat pumps also have cooling functions.

[0059] Original Thermal Energy Storage Media, source heat medium. Used to heat or cool the electrolyte; depending on the actual needs of heating or cooling, the temperature of the heat medium is significantly higher or lower than the electrolyte temperature; the temperature difference between it and the electrolyte is large.

[0060] Residual Heat Media, residual heat media (or as shown in the attached figure, residual heat media). The heat media after heating or cooling the electrolyte; the temperature difference between it and the electrolyte is small.

[0061] Heat Pump Media: The material used in a heat pump to transfer heat energy.

[0062] Thermal Energy Storage (TES): thermal storage or thermal energy storage; Energy Storage System: energy storage system, Energy Storage Power Station: energy storage power station, Electrolyte: electrolyte, Temperature Control: temperature control, Fluid Process and Control System: fluid process and control system.

[0063] For ease of understanding, the various creative points of this application are first explained. This application aims to improve the temperature control and management level of electrolyte in a liquid flow battery energy storage power station, including multiple liquid flow battery energy storage devices and multiple electrolyte storage tanks; so as to achieve energy saving in the electrolyte temperature control system of the liquid flow battery energy storage power station, reduce the frequency of equipment failures in the electrolyte storage and temperature control system, save the cost of equipment management and equipment maintenance, etc.

[0064] During the operation of the liquid flow battery energy storage device, the electrolyte therein usually needs to be controlled within a certain process temperature range; according to the process requirements of the specific liquid flow battery energy storage device, the electrolyte needs to be heated or cooled. The "heat storage" function involved in this application can be that the temperature of the source heat medium for heat storage is significantly higher than the temperature of the electrolyte, so that it has a temperature control function for heating the electrolyte when needed; it can also be that the temperature of the source heat medium for heat storage is significantly lower than the temperature of the electrolyte, so that it has a temperature control function for cooling the electrolyte when needed; the waste heat medium refers to the source heat medium after heat exchange with the electrolyte to heat or cool the electrolyte.

[0065] In order to achieve the above purpose, the solution provided by this application is: a centralized heat storage device and temperature control system for a liquid flow battery energy storage power station, including relevant P&ID examples. The centralized heat storage device and temperature control system for the liquid flow battery energy storage power station mainly includes four parts: a source heat medium (high temperature or low temperature) storage and supply system; an electrolyte storage and its temperature control system; a waste heat medium storage and supply system; and a waste heat medium recovery (high temperature or low temperature) system.

[0066] The centralized heat storage device and temperature control system of the flow battery energy storage power station in this application have at least the following advantages:

[0067] 1) For a liquid flow battery energy storage power station, a centralized heat storage device system is used to store heat or cold; according to the scale of the energy storage power station and other parameters, multiple heat storage medium tanks connected in parallel with pipelines are set, including a source heat medium tank and a waste heat medium recovery tank.

[0068] 2) According to the temperature process requirements of the electrolyte, use proportional control valves and flow transmitters to measure and control the source heat medium flow of each electrolyte storage tank, so as to control the temperature of the electrolyte in each tank within the process requirements.

[0069] 3) The control system calculates and adjusts the opening of the proportional control valve according to the electrolyte temperature in the storage tank, the source heat medium inlet temperature of the electrolyte storage tank and the waste heat medium outlet temperature, so as to control the minimized source heat medium flow rate that can meet the electrolyte temperature control requirements, thereby reducing the consumption of the source heat medium.

[0070] 4) When the temperature difference between the source heat medium and the electrolyte is not significant enough, the source heat medium passes through a supplementary heating or cooling heat exchanger piping system to increase the temperature difference between the source heat medium and the electrolyte, thereby improving the heat exchange capacity for the electrolyte.

[0071] 5) In order to increase the energy efficiency of the centralized heat storage device of the energy storage power station, that is, to save energy, the first consideration in the waste heat medium recovery system is to use a fin heat exchanger to initially exchange heat with the ambient air: the control system selects whether the waste heat medium should first pass through the fin heat exchanger for heat exchange with the ambient air based on the temperature of the waste heat medium and the demand for heating or cooling and the real-time measured ambient air temperature (which varies with the seasons and day and night).

[0072] 6) In order to increase the energy efficiency of the centralized thermal storage device of the energy storage power station, priority should be given to using high-efficiency equipment systems such as heat pumps or solar energy to heat or cool the waste heat medium, and less efficient direct electric heating methods should be avoided as much as possible.

[0073] 7) In order to improve the power regulation capability of the energy storage power station, valley electricity is used as much as possible, that is, during the charging period of the flow battery energy storage device, the waste heat medium is heated or cooled to restore it, and then stored in the source heat medium storage tank. When needed, the temperature of the electrolyte is controlled by using the heat storage source heat medium.

[0074] 8) Use heat storage medium to indirectly heat or cool the electrolyte, so that the local temperature of the electrolyte will not be too high or too low, and will not cause abnormalities such as local electrolyte decomposition or crystallization; and consider using corrosion-resistant materials to manufacture heat exchange devices, which have a long service life and low failure rate.

[0075] 9) When there are a large number of energy storage devices, that is, a large number of electrolyte storage tanks, the centralized heat storage device and electrolyte temperature control system of the present application are used to facilitate the management and maintenance of the electrolyte temperature control equipment system. Because there are multiple electrolyte energy storage devices to share the equipment costs of the centralized heat storage device, the economic efficiency of the centralized heat storage device is also within an acceptable range.

[0076] 10) The selection of a suitable thermal storage medium is also very important; this application uses an ethylene glycol / water (EG / H2O) solution of suitable concentration as a thermal storage medium for illustration.

[0077] For ease of understanding, combined Figure 1 As shown, Figure 1 It is a schematic diagram of a temperature regulation system of a liquid flow battery energy storage power station in an embodiment, wherein the temperature regulation system of the liquid flow battery energy storage power station comprises: a centralized heat storage device of the liquid flow battery energy storage power station and an electrolyte storage and temperature control system (the electrolyte storage and temperature control system comprises an electrolyte storage system and an electrolyte temperature control system, wherein the electrolyte storage system comprises an electrolyte storage tank for storing electrolyte and realizing heat exchange between the electrolyte and the source heat medium through a heat exchange device, and the electrolyte temperature control system comprises corresponding pipelines for realizing the flow of the source heat medium and the electrolyte through the heat exchange device, and a heat exchange device for realizing heat exchange between the source heat medium and the electrolyte, etc.), an input end of the electrolyte storage and temperature control system is connected to an output end of the source heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station, and a first output end of the electrolyte storage and temperature control system is connected to a second input end of the waste heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station.

[0078] The centralized heat storage device is used to store and provide source heat medium for heating or cooling the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system, and the waste heat medium storage and supply system is used to store the waste heat medium after heating or cooling the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system.

[0079] Among them, the centralized heat storage device of the liquid flow battery energy storage power station in the present application can adjust the temperature of the electrolyte in each electrolyte storage tank in the liquid flow battery energy storage power station, combined with Figure 1 As shown, the flow battery energy storage power station includes an electrolyte storage and temperature control system, which includes an electrolyte storage system, which may include multiple electrolyte storage tanks 215.1~215.n2, and each electrolyte storage tank 215.1~215.n2 may be connected in parallel or in series, which is not specifically limited here. In this way, the electrolyte temperature in multiple electrolyte storage tanks 215.1~215.n2 can be controlled by a set of centralized heat storage devices, which facilitates the management and maintenance of the electrolyte storage and temperature control system. And only the equipment cost of one centralized heat storage device is required, so the equipment economy of the centralized heat storage device is also within an affordable range.

[0080] In one of the optional embodiments, the electrolyte storage and temperature control system includes at least one heat exchange branch and a merging branch; each heat exchange branch includes a storage tank heat exchange device and a flow regulating valve based on a control system, the flow regulating valve is used to regulate the flow of the source heat medium in the heat exchange device flowing to the electrolyte storage tank, and the source heat medium in the heat exchange device is used to exchange heat with the electrolyte in the electrolyte storage tank; the merging branch is used to merge the waste heat medium flowing out of each heat exchange branch, and input the waste heat medium into the waste heat medium storage and supply system.

[0081] The heat exchange device can be located in the outer jacket of the electrolyte storage tank or built into the tank.

[0082] Continue to combine Figure 1 As shown, one of the heat exchange branches includes branch 210.1, flow transmitter 211.1, branch 212.1, proportional (flow) control valve 213.1, branch 214.1, tank temperature sensor 216.1, branch 217.1, temperature sensor 218.1 and branch 219.1. Other heat exchange branches can refer to the listed heat exchange branches.

[0083] When the source heat medium passes through branch 201 and branch 203, temperature measurement is performed to detect whether the temperature meets the temperature requirements. The temperature requirements here include temperature requirements during heating or temperature requirements during cooling. The temperature requirement during heating is that the temperature must be greater than the lower temperature limit, which is higher than the temperature of the electrolyte stored in the electrolyte storage tank. The temperature requirement during cooling is that the temperature must be less than the upper temperature limit, which is lower than the temperature of the electrolyte stored in the electrolyte storage tank.

[0084] When the temperature meets the temperature requirements, the source heat medium enters each heat exchange branch through the source heat medium shunt branch 208.1~208.n2. In each heat exchange branch, the control system PID adjusts the proportional (flow) regulating valve 213.1~213.n2 so that the initial flow is approximately equal to the minimum flow. The control system PID obtains the target flow based on the real-time measurement values ​​of the temperature sensor 202, the temperature sensor 216.1~216.n2 and the temperature sensor 218.1~218.n2. The source heat medium makes the measurement value of the temperature sensor 216.1~216.n2 meet the temperature requirements and makes the flow of the proportional (flow) regulating valve 213.1~213.n2 greater than or equal to the minimum flow. In this way, when the source heat medium passes through the heat exchange device corresponding to the electrolyte storage tank 215.1~215.n2, the electrolyte stored in the electrolyte storage tank 215.1~215.n2 is adjusted in temperature, and finally flows into each waste heat medium storage tank through the confluence branch.

[0085] In one of the optional embodiments, the electrolyte storage and temperature control system also includes a source heat medium shunt branch and a source heat medium fourth loop, the input end of the source heat medium shunt branch is the input end of the electrolyte storage and temperature control system, the first output ends of the source heat medium shunt branch are connected one-to-one with the input ends of the heat exchange branches, the second output end of the source heat medium shunt branch is connected to the input end of the source heat medium fourth loop, the output end of the source heat medium fourth loop is connected to the input end of the source heat medium storage and supply system, the output end of the source heat medium fourth loop is the second output end of the electrolyte storage and temperature control system, and the source heat medium fourth loop is used to return excess source heat medium to the source heat medium storage and supply system.

[0086] Among them, when the temperature measured by the temperature sensor 202 does not meet the temperature requirement, or when the temperature requirement is met but the flow rate is large, it is necessary to return the source heat medium whose temperature does not meet the requirement to the source heat medium storage and supply system, and / or return the source heat medium with excess flow to the source heat medium storage and supply system.

[0087] The fourth circuit of the source heat medium includes a branch 290, a flow transmitter 291, a branch 292, a proportional control valve 293, a branch 294, a check valve 295 and a branch 296. The branch 296 is connected to the waste heat medium recovery system, for example, to the output end of the first heat exchange branch, so that at least the heat exchanger in the second heat exchange branch can be used to adjust the temperature of the source heat medium whose temperature does not meet the requirements. The first output ends of the source heat medium shunt branches 208.1~208.n2 are connected to the input ends of the heat exchange branches, the second output ends of the source heat medium shunt branches 208.1~208.n2 are connected to the input end of the branch 290 of the fourth circuit of the source heat medium, and the input ends of the source heat medium shunt branches 208.1~208.n2 are the input ends of the electrolyte storage and temperature control system.

[0088] in, Figure 1 There are multiple electrolyte storage tanks 215.1~215.n2 in the flow battery energy storage power station shown. According to the process requirements of the flow battery system, the electrolyte in each tank needs to be independently controlled within a certain temperature range. The high-temperature source heat medium or low-temperature source heat medium from the source heat medium storage and supply system reaches the pipeline 203 after temperature measurement 202, and then exchanges heat with the electrolyte in the electrolyte storage tanks 215.1~215.n2 respectively.

[0089] Take one of the electrolyte storage tank systems 215.1 as an example: the high-temperature source heat medium 210.1 distributed by pipeline 203 reaches the proportional control valve 213.1 for flow regulation after flow measurement 211.1; then reaches the outer jacket or built-in coil of the electrolyte storage tank 215.1 to heat the electrolyte in the electrolyte storage tank, and 216.1 is used to monitor the temperature of the electrolyte in the electrolyte storage tank 215.1 in real time; then the heat medium passes through pipeline 217.1 and temperature measurement 218.1, and then merges with the heat medium passing through the outer jacket or built-in coil of other electrolyte storage tanks, and then reaches pipeline 220, and after temperature measurement 221, flows from the pipe mouth 307 to the residual heat medium storage tanks 301.1~301.n3. In order to reduce the consumption of high-temperature source heat medium, the PLC or DCS calculates and adjusts the opening of the proportional control valve 213.1 according to the real-time measurement values ​​of the temperature sensors 202, 216.1, and 218.1 and other process parameters to control the minimized source heat medium flow that can meet the electrolyte heating requirements.

[0090] The temperature adjustment and control processes of the remaining electrolyte storage tank systems 215.2~215.n2 are similar and will not be described in detail.

[0091] In addition, a portion of the source heat medium is distributed to the pipeline 290; after the flow measurement 291, it reaches the proportional control valve 293 for flow regulation; then after being heated by the check valve 295 and the heat exchanger 463, the excess source heat medium is returned to the source heat medium storage tanks 101.1~101.n1.

[0092] Among them, in order to facilitate understanding, continue to combine Figure 1 As shown, Figure 1 The centralized heat storage device of the flow battery energy storage power station includes a source heat medium storage and supply system, a waste heat medium storage and supply system, and a waste heat medium recovery system. The output end of the source heat medium storage and supply system is connected to the input end of the electrolyte storage and temperature control system, the first output end of the electrolyte storage and temperature control system is connected to the second input end of the waste heat medium storage and supply system, the second output end of the electrolyte storage and temperature control system is connected to the first input end of the waste heat medium recovery system, the output end of the waste heat medium storage and supply system is connected to the second input end of the waste heat medium recovery system, and the output end of the waste heat medium recovery system is connected to the input end of the source heat medium storage and supply system to realize the circulation of heat medium.

[0093] The source heat medium storage and supply system is used to provide source heat medium for heating or cooling electrolyte in at least one electrolyte storage tank, and the source heat medium storage and supply system includes a plurality of source heat medium storage tanks connected in parallel.

[0094] The waste heat medium storage and supply system is used to store waste heat medium after heating the electrolyte in at least one electrolyte storage tank or to store waste heat medium after cooling the electrolyte in at least one electrolyte storage tank, and the waste heat medium storage and supply system includes a plurality of waste heat medium storage tanks connected in parallel. The waste heat medium recovery system is used to heat or cool the waste heat medium output by the waste heat medium storage and supply system, and transmit the heated or cooled waste heat medium to at least one source heat medium storage tank of the source heat medium storage and supply system.

[0095] The heat medium before heat exchange with the electrolyte is called source heat medium, and the heat medium after heat exchange with the electrolyte is called waste heat medium.

[0096] Such a waste heat medium storage and supply system is used to store waste heat medium after heating or cooling the electrolyte in at least one electrolyte storage tank, realizing a one-to-many function, which can improve the reliability of the entire energy storage power station system and reduce the management and maintenance costs of the equipment.

[0097] In one of the optional embodiments, the source heat medium storage and supply system also includes: a source heat medium output branch, including a first temperature sensor and a first liquid level meter, and outputs the source heat medium to the electrolyte storage and temperature control system when the temperature measured by the first temperature sensor meets the first temperature requirement and the amount of source heat medium measured by the first liquid level meter meets the first surplus requirement.

[0098] Which continues to combine Figure 1 As shown, Figure 1 The source heat medium storage and supply system includes source heat medium storage tanks. The source heat medium storage tanks 101.1~101.n1 are used to store source heat medium (high temperature heat medium) for heating the electrolyte or source heat medium (low temperature heat medium) for cooling. Multiple source heat medium storage tanks are connected in parallel. According to actual project needs, the appropriate volume and number of source heat medium storage tanks are selected.

[0099] The required heat medium is stored in a certain volume of source heat medium storage tanks 101.1~101.n1 connected in parallel with one or more pipelines; according to the temperature control process requirements for heating the electrolyte in the flow battery energy storage device, the temperature of the source heat medium should be significantly higher than the temperature of the electrolyte, so that the electrolyte can be effectively heated by it. The source heat medium storage tank is equipped with a pressure transmitter 102, a liquid level transmitter 103, a temperature transmitter 104, etc., which are used to monitor the real-time working conditions of the source heat medium in the storage tank; the nozzle 105 can be used to add heat medium to the source heat medium storage tank, or to be used for functions such as opening the atmosphere and viewing windows; the nozzles 107, 108, and 109 are heat medium reflux ports, and there are corresponding pipelines in the source heat medium storage tank to fully mix the refluxed heat medium with the original heat medium in the source heat medium storage tank.

[0100] In one of the optional embodiments, the source heat medium output branch also includes a first source heat medium output branch, a second source heat medium output branch, a third source heat medium output branch and a fourth source heat medium output branch; the centralized heat storage device also includes: a first source heat medium circuit, a second source heat medium circuit and a third source heat medium circuit, wherein the output end of the first source heat medium circuit, the output end of the second source heat medium circuit and the output end of the third source heat medium circuit are all connected to each source heat medium storage tank; wherein, the output end of the first source heat medium output branch is respectively connected to the input end of the second source heat medium output branch and the input end of the first source heat medium circuit, the output end of the second source heat medium output branch, the input end of the third source heat medium output branch and the input end of the second source heat medium circuit are connected through a three-way valve, the output end of the third source heat medium output branch, the input end of the fourth source heat medium output branch and the third source heat medium circuit are connected to each source heat medium storage tank; The input ends of the three circuits are connected, and the output end of the fourth output branch of the source heat medium outputs electrolyte to the electrolyte storage and temperature control system; wherein, the first circuit of the source heat medium is used to return part of the source heat medium to the source heat medium storage tank based on the first proportional regulating valve controlled by the control system; the second circuit of the source heat medium is used to output the source heat medium to the waste heat medium recovery system for heating when it is detected that the temperature of the source heat medium output from the second output branch of the source heat medium does not meet the first temperature requirement, and return the source heat medium to the source heat medium storage tank when the temperature of the heated source heat medium still does not meet the first temperature requirement, and when the temperature of the heated source heat medium meets the first temperature requirement, the heated source heat medium is output to the input end of the fourth output branch of the source heat medium through the third circuit of the source heat medium; the third circuit of the source heat medium is used to return part of the source heat medium to the source heat medium storage tank based on the second proportional regulating valve controlled by the control system.

[0101] Continue to combine Figure 1 As shown, the first output branch of the source heat medium includes branches 110.1-110.n1, ball valves 111.1-111.n1, one of the branches composed of branches 112.1-112.n1, branch 113, filter 114, heat medium circulation pump 120, branch 121, pressure transmitter 122, branch 123, filter 124, branch 125, temperature sensor 126 and branch 127. The second output branch of the source heat medium includes branch 140, flow transmitter 141 and branch 142. The third output branch of the source heat medium includes branch 180, and the fourth output branch of the source heat medium includes branch 201.

[0102] The first source heat medium loop includes branch 130, flow transmitter 131, branch 132, proportional regulator 133 and branch 134. The second source heat medium loop includes branch 150, heat exchanger 151, branch 152, temperature sensor 153 and branch 154. The third source heat medium loop includes branch 170, branch 160, flow transmitter 161, proportional regulating valve 163 and branch 164. Branch 170 is a bidirectional flow branch.

[0103] The source heat medium is collected into pipeline 113 after passing through liquid outlets 110.1~110.n1 and ball valves 111.1~111.n1 installed in parallel at the bottom of multiple storage tanks; after the larger solid particles are removed by pre-pump filter 114, it enters source heat medium delivery pump 120.

[0104] The source heat medium at the outlet of the pump 120 passes through the pressure transmitter 122, the precision filter 124 to remove solid particles, and the temperature measurement 126 before reaching the pipeline 127.

[0105] After passing through the three-way connection, the pipeline 127 is divided into two fluid paths: the pipeline 130 passes through the flow transmitter 131, and the proportional control valve 133 adjusts the flow according to the PLC or DCS command, and then flows back from the pipe port 109 to the source heat medium storage tank. This pipeline is mainly used for the return of excess source heat medium and the mixing of the source heat medium in the storage tank to make its temperature uniform. In addition, the pipeline 140 passes through the flow transmitter 141 and reaches the three-way valve 143.

[0106] The three-way valve 143 selects one of the flow directions according to the working condition control logic, i.e., the PLC or DCS instruction: the pipeline 150 is heated by the heat exchanger 151 to supplement the heat, and reaches the pipeline 154 after the temperature measurement 153; the other flow direction of the three-way valve 143 is the pipeline 180.

[0107] After passing through the three-way connection, the pipeline 154 is divided into two fluid paths: the pipeline 160 passes through the flow transmitter 161, and the proportional control valve 163 adjusts the flow according to the PLC or DCS command, and then flows back from the pipe mouth 108 to the source heat medium storage tank. This pipeline is mainly used for the return of excess source heat medium and the mixing of the source heat medium in the storage tank to make its temperature uniform; another pipeline 170 of the pipeline 154 after passing through the three-way connection merges with another outlet pipeline 180 of the three-way valve 143 to the pipeline 201, providing high-temperature fluid to the electrolyte storage tank system for heating the electrolyte. Among them, the fluid in the pipeline 170 can flow in both directions. When the three-way valve selects the outlet pipeline 180, part of the source heat medium can also flow back from the pipe mouth 108 to the source heat medium storage tank after passing through the pipelines 170, 160, and the proportional control valve 163.

[0108] In one optional embodiment, the waste heat medium recovery system includes a first heat exchange branch and a second heat exchange branch.

[0109] Among them, when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air meets the requirements, the waste heat medium is temperature-regulated by utilizing the ambient air through the first heat exchange branch, and / or the waste heat medium is temperature-regulated by connecting the second heat exchange branch in series; when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air does not meet the requirements, the waste heat medium is temperature-regulated by the second heat exchange branch.

[0110] The second heat exchange branch includes a heat source device, the heat source device includes an electric heat exchange device and other energy heat exchange devices, the use priority of other energy heat exchange devices is higher than that of the electric heat exchange device, the other energy heat exchange devices include at least one of a heat pump heater, a solar heater, and a heat pump refrigerator; and the use priority of the electric heat exchange device in the valley power stage is higher than that in the peak power stage.

[0111] Among them, in order to increase the energy efficiency of the centralized heat storage device of the energy storage power station, that is, to save energy, the target heat exchanger (optionally, the target heat exchanger can be a fin heat exchanger) is first considered in the waste heat medium recovery system to initially exchange heat with the ambient air: the control system selects and determines whether the waste heat medium first passes through the target heat exchanger for heat exchange with the ambient air according to the temperature of the waste heat medium and the heating or cooling requirements and the real-time measured ambient air temperature (which changes with the seasons and day and night). In order to increase the energy efficiency of the centralized heat storage device of the energy storage power station, it is preferred to use high-efficiency equipment systems such as heat pumps or solar energy to heat or cool the waste heat medium, and try not to use the less efficient direct electric heating method. And in order to improve the power regulation capacity of the energy storage power station, valley electricity is used as much as possible, that is, during the charging period of the liquid flow battery energy storage device, the waste heat medium is heated or cooled, and then stored in the source heat medium storage tank, and the temperature of the electrolyte is controlled by the heat storage source heat medium when needed. By using the heat storage source heat medium to indirectly heat or cool the electrolyte, the local temperature of the electrolyte will not be too high or too low, and will not cause abnormal phenomena such as local decomposition or crystallization of the electrolyte; and it is possible to consider using corrosion-resistant materials to manufacture the heat exchange device, which has a long service life and a low failure rate.

[0112] In one of the optional embodiments, the first heat exchange branch includes: a flow measurement module for measuring the flow of waste heat medium flowing out of the waste heat medium storage and supply system, and when the waste heat medium flow is greater than or equal to a flow threshold, opening a large flow branch, the large flow branch and the initial flow branch are parallel branches, and when the waste heat medium flow is less than the flow threshold, the waste heat medium flow of the initial flow branch is controlled and adjusted based on the control system; a target heat exchanger, for performing heat exchange between air and the waste heat medium by forced convection, and regulating the temperature of the waste heat medium.

[0113] In some optional embodiments, the target heat exchanger includes a heat exchanger and a fan or a compressed air source. The heat exchanger uses air to heat the waste heat medium; the fan or compressed air source is used to blow air toward the target heat exchanger. The heat exchanger can be a fin heat exchanger.

[0114] The flow measurement module is a flow transmitter 402 , and the large flow branch includes a branch 410 , an electric ball valve 411 , and a branch 412 . The initial flow branch includes a branch 420 , a proportional control valve 421 , and a branch 422 .

[0115] The first heat exchange branch further includes branch 430 , temperature sensor 431 , branch 432 , three-way valve 433 , branch 440 , target heat exchanger 442 , branch 450 , fan 443 , branch 444 , branch 451 , check valve 452 , and branch 453 .

[0116] Among them, the waste heat medium in pipeline 401 reaches pipeline 403 after flow measurement 402, and is divided into two paths after passing through the three-way valve: one path 420 passes through proportional control valve 421 for flow regulation; the other path 410 passes through electric ball valve 411 for emergency high flow conditions. After passing through the two valves in parallel, the waste heat medium converges to pipeline 430, and reaches three-way valve 433 after temperature measurement 431: when the ambient air temperature 441 is higher than the waste heat medium temperature 431, the three-way valve 433 selects outlet 440, and the waste heat medium in pipeline 440 exchanges heat with the ambient air through the target heat exchanger 442 for preliminary heating, and the fan 443 blows the higher temperature air to the target heat exchanger to increase the heat exchange efficiency; when the ambient air temperature 441 is lower than the waste heat medium temperature 431, the three-way valve 433 selects outlet 450 and does not exchange heat with the ambient air. Then the residual heat medium flows into pipeline 451 , passes through check valve 452 , and then flows into pipeline 460 together with the source heat medium from check valve 295 and pipeline 296 .

[0117] In one of the optional embodiments, the second heat exchange branch includes a first heat exchanger and a second heat exchanger, both of which are connected in parallel with the heat source equipment, the first heat exchanger is used to regulate the temperature of the waste heat medium output by the waste heat medium storage and supply system, and the second heat exchanger is used to regulate the temperature of the source heat medium refluxed in the source heat medium storage and supply system.

[0118] Which continues to combine Figure 1 As shown, the output end of the first heat exchange branch is connected to branch 460, and a temperature sensor 461 is provided on branch 460 to collect the temperature of the waste heat medium. When the temperature meets the requirements, it will flow back to the source heat medium storage tank until it passes through the first heat exchanger 463 and reaches branch 464, temperature sensor 465 and branch 466.

[0119] The second heat exchange branch includes a first heat exchanger and a second heat exchanger, wherein the first heat exchanger 463 and the second heat exchanger 151 are respectively connected in parallel with the heat source device 470, the first heat exchanger is used to regulate the temperature of the waste heat medium output by the waste heat medium storage and supply system, and the second heat exchanger is used to regulate the temperature of the source heat medium refluxed in the source heat medium storage and supply system.

[0120] Specifically, the heat medium in the pipeline 460 reaches the first heat exchanger 463 for heating after temperature measurement 461; the heated heat medium flows out from the heat exchanger outlet 464, and flows back from the pipe port 107 to the source heat medium storage tanks 101.1~101.n1 for storage after temperature measurement 465.

[0121] Device 470 is used to provide a heat source (or cold source), which can be a heat pump, a solar heater or an electric heater, etc., and the device 470 integrates functional components such as a transmitter, a controller, and an actuator. It is preferred to use devices such as heat pumps or solar heaters to improve energy efficiency. And it should be considered to make full use of "valley electricity", that is, the charging period of the liquid flow battery energy storage device, to heat the waste heat medium and store it in the source heat medium storage tank; try not to use electricity to heat the waste heat medium during the "peak electricity" period. According to the process requirements and other parameters of the liquid flow battery system of the energy storage power station, the appropriate volume of the two heat medium storage tanks is calculated.

[0122] The high-temperature heating medium in the device 470 flows out from the outlet 471 and passes through the temperature measurement 472, and then reaches the three-way and is divided into two paths: one path of the high-temperature heating medium passes through the solenoid valve 481, enters the first heat exchanger 463 from the pipe port 482, performs heat exchange in 463 to heat the residual heat medium entering the pipe port 462, and then the heating medium flows out from the pipe port 486; the other path of the high-temperature heating medium passes through the solenoid valve 491, enters the heat exchanger 151 from the pipe port 492, performs heat exchange in 151 to supplement the source heat medium entering the pipe port 150, and then the heating medium flows out from the pipe port 496. The heating medium passing through the pipe ports 486 and 496 converges to the pipe port 476 and passes through the temperature measurement 477, and then flows back to the device 470 from the pipe port 478 to complete its circulation process.

[0123] In one of the optional embodiments, the waste heat medium storage and supply system also includes: a first output branch of waste heat medium, a second output branch of waste heat medium and a waste heat medium loop; wherein the input end of the first output branch of waste heat medium is connected to the output end of each waste heat medium storage tank, the output end of the first output branch of waste heat medium is connected to the input end of the second output branch of waste heat medium and the input end of the waste heat medium loop, the output end of the waste heat medium loop is connected to the first input end of the waste heat medium storage and supply system, and the output end of the second output branch of waste heat medium is connected to the input end of the waste heat medium recovery system; wherein the first output branch of waste heat medium includes a second temperature sensor and a second liquid level meter, and when the temperature measured by the second temperature sensor meets the second temperature requirement and the amount of waste heat medium measured by the second liquid level meter meets the second residual requirement, the waste heat medium is output to the second output branch of waste heat medium and the waste heat medium loop; the waste heat medium loop is used to control the flow regulation based on the control system to adjust the amount of waste heat medium flowing back to the waste heat medium storage tank.

[0124] Among them, continue to combine Figure 1 As shown, the first output branch of the waste heat medium includes branches 310.1~310.n3, ball valves 311.1~311.n3, branches 312.1~312.n3, branch 313, front filter 314, branch 315, heat medium circulation pump 320, branch 321, flow transmitter 322, branch 323, rear filter 324, branch 325, temperature sensor 326, and branch 327.

[0125] The second output branch of the waste heat medium includes branch 401 .

[0126] The waste heat medium circuit includes a branch 330 , a flow transmitter 331 , a branch 332 , a proportional control valve 333 , and a branch 334 .

[0127] The waste heat medium storage tanks 301.1~301.n3 are used to store waste heat medium from the outer jacket of the electrolyte storage tank or the built-in coil after heat exchange and cooling. The waste heat medium storage tank is equipped with a pressure transmitter 302, a liquid level transmitter 303, a temperature transmitter 304, etc., which are used to monitor the real-time working conditions of the waste heat medium in the storage tank; the nozzle 305 can be used to add heat medium to the storage tank, or to open the atmosphere, a window, etc.; the nozzles 307 and 309 are heat medium return ports, and there are corresponding pipelines in the storage tank to fully mix the return heat medium with the original heat medium in the storage tank.

[0128] The waste heat medium is collected into the pipeline 313 after passing through the liquid outlets 310.1~310.n3 and ball valves 311.1~311.n3 installed in parallel at the bottom of multiple storage tanks; after the larger solid particles are removed by the pre-pump filter 314, it enters the waste heat medium delivery pump 320.

[0129] The waste heat medium at the outlet of pump 320 passes through pressure transmitter 322, after filter or precision filter 324 to remove solid particles, and temperature sensor 326, and then reaches pipeline 327. Pipeline 327 is divided into two fluids after passing through a three-way: pipeline 330 passes through flow transmitter 331, proportional control valve 333 adjusts the flow according to PLC or DCS instructions, and then flows back from pipe mouth 309 to the waste heat medium storage tank. This pipeline is mainly used for the return of excess waste heat medium and the mixing and mixing of waste heat medium in the storage tank to make its temperature uniform. In addition, pipeline 401 transports the waste heat medium to the waste heat medium recovery system for heating, and then returns to the source heat medium storage tank 101.1~101.n1.

[0130] In order to avoid ambiguity, Figure 1 The symbols in are explained as follows:

[0131] Source heat medium storage tank: 101.1~101.n1, etc.; used to store high-temperature heat medium for heating the electrolyte or low-temperature heat medium for cooling; multiple storage tanks are connected in parallel, and the appropriate storage tank volume and quantity are selected according to actual project needs.

[0132] Temperature sensor TE: 104, 126, 153, 202, 216.1~216.n2, 218.1~218.n2, 221, 304, 326, 431, 441, 461, 465, 472, 477, etc. You can choose to use a suitable thermocouple or thermal resistor as a sensor; used for temperature measurement and transmission.

[0133] Pressure transmitter PIT: 102, 122, 302, 322, etc.; used for pressure measurement and transmission.

[0134] Liquid level transmitter LIT: 103, 303, etc.; used for liquid level measurement and transmission.

[0135] Ball valve: 111.1~111.n1, 311.1~311.n3, etc.; used for opening and closing pipelines.

[0136] Filters: 114, 124, 314, 324, etc.; used to remove solid particles from pipeline fluids.

[0137] Heat medium circulation pump: 120, 320, etc.; used for heat medium transportation.

[0138] Flow transmitter FIT: 131, 141, 161, 211.1~211.n2, 291, 331, 402, etc.; used for flow measurement and transmission.

[0139] Proportional control valve: 133, 163, 213.1~213.n2, 293, 333, 421, etc. You can choose to use electric valve or pneumatic valve, etc.; used for flow regulation control.

[0140] Check valve: 295, 452, etc.; used to prevent fluid backflow.

[0141] Three-way valve: 143, 433, you can choose to use an electric three-way valve or a pneumatic three-way valve, etc.; used to select the flow direction of the fluid.

[0142] Heat exchanger: 151, 463, you can choose to use shell and tube heat exchanger or plate heat exchanger, etc.; used for heat exchange of fluid medium.

[0143] Electrolyte storage tank: 215.1~215.n2, etc.; used to store and supply electrolyte used by various flow battery energy storage devices, and maintain the temperature of the electrolyte within a certain range. The tank shown in the figure has an outer jacket, and the heat medium in the jacket exchanges heat with the electrolyte in the tank; the tank can also be set with a built-in coil, etc., and the heat medium in the coil exchanges heat with the electrolyte in the tank.

[0144] Waste heat medium storage tank: 301.1~301.n3, etc.; used to store heat medium after heating or cooling the electrolyte; multiple storage tanks are connected in parallel, and the appropriate storage tank volume and quantity are selected according to actual project needs.

[0145] Fin heat exchanger and its fan: 442, 443, etc.; used to exchange heat with ambient air and perform preliminary heat exchange of the waste heat medium recovery system.

[0146] Heat pump heaters, solar heaters, and electric heaters, or heat pump refrigerators, and other cold source device systems, etc.: 470; used to provide heat source or cold source.

[0147] Solenoid valve: 481, 491, etc.; used to open or close fluid pipelines such as heat pump heat medium.

[0148] Figure 1 The containers, pumps, valves, pipelines, and equipment shown in the figure have insulation layers of appropriate type and thickness to reduce heat dissipation to the surrounding environment.

[0149] For ease of understanding, combined Figures 2 to 4 As shown. Figures 2 to 4 Generally, it is shown that in the working conditions where the electrolyte needs to be heated, Figure 1 The temperature regulation control system of the centralized heat storage device of the flow battery energy storage power station and the electrolyte in the storage tank, and the logic flow chart (PFD for Control Logic) of temperature and heat storage heat medium flow regulation are shown in the figure.

[0150] in, Figure 2 is a control flow chart of a source heat medium (high temperature) storage and supply system in one embodiment, Figure 3 A control flow chart of an electrolyte storage and temperature control system and a waste heat medium storage and supply system in one embodiment; Figure 4 The control flow chart of the waste heat medium recovery (heating) system in one embodiment.

[0151] Generally speaking, the electrolyte in a flow battery energy storage device needs to be kept within a certain temperature range to avoid crystallization and decomposition of the electrolyte and to ensure that the active substances in the electrolyte have a suitable electrochemical reaction rate. For the electrolyte in different types of flow battery energy storage devices, under different operating conditions during operation, the electrolyte may need to be heated or cooled to keep the temperature of the electrolyte within the range required by the process.

[0152] This application is explained by taking the process of heating the electrolyte in the storage tanks 215.1~215.n2 as an example, so that: the temperature of the source heat medium in the storage tanks 101.1~101.n1 needs to be significantly higher than the electrolyte temperature; the temperature of the waste heat medium in the storage tanks 301.1~301.n3 is lower than the source heat medium temperature, but also higher than the electrolyte temperature; when the ambient temperature 441 is higher than the waste heat medium temperature 431, the target heat exchanger is used to preliminarily heat the waste heat medium; the heat pump heater, electric heater or solar heater 470 is operated in the heating mode, and the heat medium is heated by the heat exchangers 151 and 463.

[0153] If it is necessary to cool the electrolyte in the storage tanks 215.1~215.n2, a source heat medium with a certain amount of cooling is used to exchange heat with the electrolyte. Since the process is similar, it will not be repeated here.

[0154] The selection of a suitable thermal storage medium is also very important. When selecting a thermal storage medium, various parameters related to it should be comprehensively considered, such as: specific heat capacity, freezing point or pour point, boiling point and volatility, flammability and explosiveness, toxicity and environmental factors, polymerization and other reaction properties, material corrosiveness, price, and geographical climate and ambient temperature of the flow battery energy storage power station. The present invention is described using a suitable concentration of ethylene glycol / water (EG / H2O) solution as a thermal medium.

[0155] Among them, combined Figure 2 As shown, the source heat medium (high temperature or low temperature) storage and supply system is described by taking the process of heating the electrolyte as an example:

[0156] The required heat medium is stored in one or more source heat medium storage tanks 101.1~101.n1 with a certain capacity and connected in parallel through output pipelines; according to the example, the electrolyte in the flow battery energy storage device needs to be heated and its temperature controlled to meet the process requirements. The temperature of the source heat medium should be significantly higher than the temperature of the electrolyte so that it can be used to effectively heat the electrolyte. The source heat medium storage tank is equipped with a pressure transmitter 102, a liquid level transmitter 103, a temperature transmitter 104, etc., which are used to monitor the real-time working conditions of the source heat medium in the storage tank; the nozzle 105 can be used to add heat medium to the storage tank, or to be used for functions such as opening the atmosphere and viewing windows; the nozzles 107, 108, and 109 are heat medium return ports, and there are corresponding pipelines in the storage tank to fully mix the refluxed heat medium with the original heat medium in the storage tank.

[0157] The source heat medium is collected into pipeline 113 through liquid outlets 110.1~110.n1 and ball valves 111.1~111.n1 installed in parallel at the bottom of multiple storage tanks; after the larger solid particles are removed by pre-pump filter 114, it enters source heat medium delivery pump 120.

[0158] The source heat medium at the outlet of the pump 120 passes through a pressure transmitter 122, a post-filter or precision filter 124 to remove solid particles, and a temperature measurement 126 before reaching a pipeline 127.

[0159] After passing through the three-way connection, the pipeline 127 is divided into two fluid paths: the pipeline 130 passes through the flow transmitter 131, and the proportional control valve 133 adjusts the flow according to the PLC or DCS command, and then flows back from the pipe port 109 to the source heat medium storage tank. This pipeline is mainly used for the return of excess source heat medium and the mixing of the source heat medium in the storage tank to make its temperature uniform. In addition, the pipeline 140 passes through the flow transmitter 141 and reaches the three-way valve 143.

[0160] The three-way valve 143 selects one of the flow directions according to the working condition control logic, i.e., the PLC or DCS instruction: the pipeline 150 is heated by the heat exchanger 151 to supplement the heat, and reaches the pipeline 154 after the temperature measurement 153; the other flow direction of the three-way valve 143 is the pipeline 180.

[0161] After passing through the three-way connection, the pipeline 154 is divided into two fluid paths: the pipeline 160 passes through the flow transmitter 161, and the proportional control valve 163 adjusts the flow according to the PLC or DCS command, and then flows back from the pipe mouth 108 to the source heat medium storage tank. This pipeline is mainly used for the return of excess source heat medium and mixing with the source heat medium in the storage tank to make its temperature uniform; another pipeline 170 of the pipeline 154 after passing through the three-way connection and another outlet pipeline 180 of the three-way valve 143 merges into the pipeline 201, providing high-temperature fluid to the electrolyte storage tank storage and temperature control system for heating the electrolyte. Among them, the fluid in the pipeline 170 can flow in both directions. When the three-way valve selects the outlet pipeline 180, part of the source heat medium can also flow back from the pipe mouth 108 to the source heat medium storage tank after passing through the pipelines 170, 160, and the proportional control valve 163.

[0162] Combination Figure 3 As shown in the figure, the electrolyte storage and temperature control system is described by taking the process of heating the electrolyte as an example:

[0163] Figure 1 There are multiple electrolyte storage tanks 215.1~215.n2 in the flow battery energy storage power station shown. According to the process requirements of the flow battery system, it is necessary to independently control the electrolyte in each tank within a certain temperature range. The high-temperature source heat medium 201 from the source heat medium storage and supply system reaches the pipeline 203 after temperature measurement 202, and then is supplied to the electrolyte storage tanks 215.1~215.n2 respectively.

[0164] Take one of the electrolyte storage tank systems 215.1 as an example: the high-temperature source heat medium 210.1 distributed by pipeline 203 reaches the proportional control valve 213.1 for flow regulation after flow measurement 211.1; then reaches the outer jacket or built-in coil of the electrolyte storage tank 215.1 to heat the electrolyte in the tank, and 216.1 is used to monitor the temperature of the electrolyte in the tank 215.1 in real time; then the heat medium passes through pipeline 217.1 and temperature measurement 218.1, and then merges with the heat medium passing through the outer jacket or built-in coil of other electrolyte storage tanks, and then reaches pipeline 220, and after temperature measurement 221, flows from the pipe mouth 307 to the waste heat medium storage tanks 301.1~301.n3. In order to reduce the consumption of high-temperature source heat medium, the PLC or DCS calculates and adjusts the opening of the proportional control valve 213.1 according to the real-time measurement values ​​of the temperature sensors 202, 216.1, and 218.1 and other process parameters to control the minimized source heat medium flow that can meet the electrolyte heating requirements.

[0165] The temperature adjustment and control processes of the remaining electrolyte storage tank systems 215.2~215.n2 are similar and will not be described in detail.

[0166] In addition, pipeline 203 also distributes a part of the source heat medium to pipeline 290; after flow measurement 291, it reaches proportional control valve 293 for flow regulation; then after heating through check valve 295 and heat exchanger 463, the excess source heat medium is returned to source heat medium storage tanks 101.1~101.n1.

[0167] Combination Figure 3 As shown in the figure, the waste heat medium storage and supply system is described by taking the process of heating the electrolyte as an example:

[0168] The waste heat medium storage tanks 301.1~301.n3 are used to store the waste heat medium after heat exchange and cooling through the outer jacket of the electrolyte storage tank or the internal coil. The waste heat medium storage tank is equipped with a pressure transmitter 302, a liquid level transmitter 303, a temperature transmitter 304, etc., which are used to monitor the real-time working conditions of the waste heat medium in the storage tank; the nozzle 305 can be used to add heat medium to the storage tank, or to open the atmosphere, a window, etc.; the nozzles 307 and 309 are heat medium return ports, and there are corresponding pipelines in the storage tank to fully mix the returned heat medium with the original heat medium in the storage tank.

[0169] The waste heat medium is collected into the pipeline 313 after passing through the liquid outlets 310.1~310.n3 and ball valves 311.1~311.n3 installed in parallel at the bottom of multiple storage tanks; after the larger solid particles are removed by the pre-pump filter 314, it enters the waste heat medium delivery pump 320.

[0170] The waste heat medium at the outlet of the pump 320 passes through a pressure transmitter 322, a post-filter or precision filter 324 to remove solid particles, and a temperature measurement 326 before reaching a pipeline 327.

[0171] After passing through the three-way connection, pipeline 327 is divided into two fluid paths: pipeline 330 passes through flow transmitter 331, and proportional control valve 333 adjusts the flow according to PLC or DCS instructions, and then flows back to the waste heat medium storage tank from pipe port 309. This pipeline is mainly used for the return of excess waste heat medium and mixing with the waste heat medium in the storage tank to make its temperature uniform. In addition, pipeline 401 transports the waste heat medium to the waste heat medium recovery system for heating, and then returns to the source heat medium storage tank 101.1~101.n1.

[0172] Combination Figure 4 As shown in the figure, the waste heat medium recovery (heating or cooling) system is described by taking the process of heating the electrolyte as an example:

[0173] The waste heat medium in pipeline 401 reaches pipeline 403 after flow measurement 402, and is divided into two paths after passing through three-way valves: one path 420 passes through proportional control valve 421 for flow regulation; the other path 410 passes through electric ball valve 411 for emergency high flow conditions. After passing through the two valves in parallel, the waste heat medium converges to pipeline 430, and reaches three-way valve 433 after temperature measurement 431: when the ambient air temperature 441 is higher than the waste heat medium temperature 431, the three-way valve 433 selects outlet 440, and the waste heat medium in pipeline 440 exchanges heat with the ambient air through the target heat exchanger 442 for preliminary heating, and the fan 443 blows the higher temperature air to the target heat exchanger to increase the heat exchange efficiency; when the ambient air temperature 441 is lower than the waste heat medium temperature 431, the three-way valve 433 selects outlet 450 and does not exchange heat with the ambient air. Then the waste heat medium flows to pipeline 451, passes through check valve 452, and then flows back to pipeline 460 with the source heat medium from check valve 295 and pipeline 296. The heat medium in pipeline 460 reaches heat exchanger 463 for heating after temperature measurement 461; the heated heat medium flows out from heat exchanger outlet 464, and flows back from pipe port 107 to source heat medium storage tanks 101.1~101.n1 for storage after temperature measurement 465.

[0174] Device 470 is used to provide a heat source (or cold source), which can be a heat pump, a solar heater or an electric heater, etc., and the device 470 integrates functional components such as a transmitter, a controller, and an actuator. The use of heat pumps or solar heaters is preferred to improve energy efficiency. And it should be considered to make full use of "valley electricity", that is, the charging period of the liquid flow battery energy storage device, to heat the waste heat medium and store it in the source heat medium storage tank; try not to use electricity to heat the waste heat medium during the "peak electricity" period. According to the process requirements and other parameters of the liquid flow battery system of the energy storage power station, the appropriate volume of the two heat medium storage tanks is calculated.

[0175] The high-temperature heating medium in the device 470 flows out from the outlet 471 and passes through the temperature measurement 472, and then reaches the three-way and is divided into two paths: one path of the high-temperature heating medium passes through the solenoid valve 481, enters the heat exchanger 463 from the pipe port 482, performs heat exchange in 463 to heat the residual heat medium entering the pipe port 462, and then the heating medium flows out from the pipe port 486; the other path of the high-temperature heating medium passes through the solenoid valve 491, enters the heat exchanger 151 from the pipe port 492, performs heat exchange in 151 to supplement the source heat medium entering the pipe port 150, and then the heating medium flows out from the pipe port 496. The heating medium passing through the pipe ports 486 and 496 converges to the pipe port 476 and passes through the temperature measurement 477, and then flows back to the device 470 from the pipe port 478, completing its circulation process.

[0176] For ease of understanding, combined Figures 5 to 7 As shown. Figures 5 to 7 It is generally shown that in conditions where electrolyte cooling is required, Figure 1 The temperature control system of the centralized heat storage device of the flow battery energy storage power station and the electrolyte in the storage tank, and the logic flow chart of temperature and heat storage heat medium flow control (PFD for Control Logic)

[0177] in, Figure 5 This is a control flow chart of a source heat medium (low temperature) storage and supply system in another embodiment. Figure 6 A control flow chart of an electrolyte storage and temperature control system and a waste heat medium storage and supply system in another embodiment; Figure 7 This is a control flow chart of a waste heat medium recovery (cooling) system in another embodiment. The definition of the cooling working condition can refer to the definition of the heating working condition above, and will not be repeated here.

[0178] The present application has at least the following advantages: 1) It can fully consider using valley electricity to heat or cool the heat medium and store heat in advance, and use the heat storage source heat medium to control the temperature of the electrolyte when needed. 2) It can consider using the temperature difference between the ambient air and the waste heat medium for preliminary heat exchange, thereby saving energy. 3) Compared with direct electrical heating of the electrolyte, the energy efficiency ratio of heating using a heat pump system or a solar heating system is high. 4) The electrolyte is indirectly heated or cooled using a heat storage heat medium, and the local temperature of the electrolyte will not be too high or too low; and it can be considered to use corrosion-resistant materials to manufacture the heat exchange device, which has a long life and low failure rate. 5) When the number of energy storage devices is large, that is, the number of electrolyte storage tanks is large, the centralized heat storage device and electrolyte temperature regulation and control system described in the present invention are used to facilitate the management and maintenance of the electrolyte temperature control equipment system; because there are multiple electrolyte energy storage devices to share the equipment cost of the centralized heat storage device, the economy of the centralized heat storage device equipment is also within an acceptable range.

[0179] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0180] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0181] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0182] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A centralized heat storage device for a flow battery energy storage power station, characterized in that: The device comprises: A source heat medium storage and supply system, used to store and provide a source heat medium for heating or cooling the electrolyte in at least one electrolyte storage tank, the source heat medium storage and supply system comprising a plurality of source heat medium storage tanks connected in parallel; A waste heat medium storage and supply system, used to store waste heat medium after heating at least one of the electrolytes or to store waste heat medium after cooling the electrolyte, the waste heat medium storage and supply system comprising a plurality of waste heat medium storage tanks connected in parallel; The heat medium before heat exchange with the electrolyte is called source heat medium, and the heat medium after heat exchange with the electrolyte is called waste heat medium; A waste heat medium recovery system is used to heat or cool the waste heat medium output by the waste heat medium storage and supply system, and transmit the heated or cooled waste heat medium to at least one source heat medium storage tank of the source heat medium storage and supply system.

2. The device according to claim 1, characterized in that The source heat medium storage and supply system further includes: The source heat medium output branch includes a first temperature sensor and a first liquid level measuring device. When the temperature measured by the first temperature sensor meets the first temperature requirement and the amount of the source heat medium measured by the first liquid level measuring device meets the first surplus requirement, the source heat medium is output to the electrolyte storage and temperature control system.

3. The device according to claim 2, characterized in that The source heat medium output branch also includes a source heat medium first output branch, a source heat medium second output branch, a source heat medium third output branch and a source heat medium fourth output branch; The centralized heat storage device further comprises: a first source heat medium circuit, a second source heat medium circuit and a third source heat medium circuit, wherein the output end of the first source heat medium circuit, the output end of the second source heat medium circuit and the output end of the third source heat medium circuit are all connected to each of the source heat medium storage tanks; Wherein, the output end of the first output branch of the source heat medium is respectively connected to the input end of the second output branch of the source heat medium and the input end of the first circuit of the source heat medium, the output end of the second output branch of the source heat medium, the input end of the third output branch of the source heat medium and the input end of the second circuit of the source heat medium are connected through a three-way valve, the output end of the third output branch of the source heat medium, the input end of the fourth output branch of the source heat medium and the input end of the third circuit of the source heat medium are connected, and the output end of the fourth output branch of the source heat medium outputs the electrolyte to the electrolyte storage and temperature control system; Wherein, the first source heat medium circuit is used to return part of the source heat medium to the source heat medium storage tank based on a first proportional regulating valve controlled by a control system; The second source heat medium circuit is used to output the source heat medium to the waste heat medium recovery system for heating when it is detected that the temperature of the source heat medium outputted from the second output branch of the source heat medium does not meet the first temperature requirement, and to reflux the source heat medium to the source heat medium storage tank when the temperature of the heated source heat medium still does not meet the first temperature requirement, and to output the heated source heat medium to the input end of the fourth output branch of the source heat medium through the third source heat medium circuit when the temperature of the heated source heat medium meets the first temperature requirement; The source heat medium third circuit is used to return part of the source heat medium to the source heat medium storage tank based on a second proportional regulating valve controlled by a control system.

4. The device according to claim 2, characterized in that The waste heat medium recovery system includes a first heat exchange branch and a second heat exchange branch; Wherein, when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air meets the requirements, the waste heat medium is temperature-regulated by using the ambient air through the first heat exchange branch, and / or the waste heat medium is temperature-regulated by connecting the second heat exchange branch in series; when the temperature difference between the waste heat medium output by the waste heat medium storage and supply system and the ambient air does not meet the requirements, the waste heat medium is temperature-regulated by the second heat exchange branch; The second heat exchange branch includes a heat source device, and the heat source device includes an electric heat exchange device and other energy heat exchange devices. The priority of the other energy heat exchange devices is higher than that of the electric heat exchange device. The other energy heat exchange devices include at least one of a heat pump heater, a solar heater, and a heat pump refrigerator; and the use priority of the electric heat exchange device in the valley electricity stage is higher than that in the peak electricity stage.

5. The device according to claim 4, characterized in that The first heat exchange branch comprises: a flow measurement module, used for measuring the flow of waste heat medium flowing out of the waste heat medium storage and supply system, and opening a large flow branch when the waste heat medium flow is greater than or equal to a flow threshold, wherein the large flow branch and the initial flow branch are parallel branches, and when the waste heat medium flow is less than the flow threshold, controlling and adjusting the waste heat medium flow of the initial flow branch based on a control system; The target heat exchanger is used to perform heat exchange between the air and the waste heat medium by forced convection to adjust the temperature of the waste heat medium.

6. The device according to claim 4, characterized in that The second heat exchange branch includes a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are both connected in parallel with the heat source equipment, the first heat exchanger is used to regulate the temperature of the waste heat medium output by the waste heat medium storage and supply system, and the second heat exchanger is used to regulate the temperature of the source heat medium refluxed in the source heat medium storage and supply system.

7. The device according to claim 1, characterized in that The waste heat medium storage and supply system further includes: a first waste heat medium output branch, a second waste heat medium output branch and a waste heat medium circuit; The input end of the first output branch of the waste heat medium is connected to the output end of each of the waste heat medium storage tanks, the output end of the first output branch of the waste heat medium is connected to the input end of the second output branch of the waste heat medium and the input end of the waste heat medium circuit, the output end of the waste heat medium circuit is connected to the first input end of the waste heat medium storage and supply system, and the output end of the second output branch of the waste heat medium is connected to the input end of the waste heat medium recovery system; The first waste heat medium output branch includes a second temperature sensor and a second liquid level measuring device, and when the temperature measured by the second temperature sensor meets the second temperature requirement and the waste heat medium quantity measured by the second liquid level measuring device meets the second surplus quantity requirement, the waste heat medium is output to the second waste heat medium output branch and the waste heat medium circuit; The waste heat medium circuit is used to control flow regulation based on a control system to adjust the amount of waste heat medium flowing back to the waste heat medium storage tank.

8. A temperature control system for a flow battery energy storage power station, characterized in that: include: A centralized heat storage device for a flow battery energy storage power station as claimed in any one of claims 1 to 7; as well as An electrolyte storage and temperature control system, wherein the input end of the electrolyte storage and temperature control system is connected to the output end of the source heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station, and the first output end of the electrolyte storage and temperature control system is connected to the second input end of the waste heat medium storage and supply system of the centralized heat storage device of the liquid flow battery energy storage power station; The centralized heat storage device is used to store and provide heating or cooling for the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system, and the waste heat medium storage and supply system is used to store the waste heat medium after heating or cooling the electrolyte in at least one electrolyte storage tank in the electrolyte storage and temperature control system.

9. The system according to claim 8, characterized in that The electrolyte storage and temperature control system includes at least one heat exchange branch and a confluence branch; Each of the heat exchange branches comprises a heat exchange device and a flow regulating valve based on a control system, wherein the flow regulating valve is used to regulate the flow of the source heat medium flowing to the heat exchange device, wherein the source heat medium in the heat exchange device is used to perform heat exchange with the electrolyte in the electrolyte storage tank; The merging branch is used to merge the waste heat medium flowing out of each of the heat exchange branches and input the waste heat medium into the waste heat medium storage and supply system.

10. The system according to claim 9, characterized in that The electrolyte storage and temperature control system also includes a source heat medium shunt branch and a source heat medium fourth loop. The input end of the source heat medium shunt branch is the input end of the electrolyte storage and temperature control system. The first output ends of the source heat medium shunt branches are connected one-to-one with the input ends of the heat exchange branches. The second output end of the source heat medium shunt branch is connected to the input end of the source heat medium fourth loop. The output end of the source heat medium fourth loop is connected to the input end of the source heat medium storage and supply system. The output end of the source heat medium fourth loop is the second output end of the electrolyte storage and temperature control system. The source heat medium fourth loop is used to return excess source heat medium to the source heat medium storage and supply system.

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