Flow battery energy storage system

Abstract

The invention provides a flow battery energy storage system. The flow battery energy storage system comprises a charging unit, a discharging unit and an electrolyte conveying unit, the charging unit is located on a power generation side. The discharging unit is located on a power utilization side. The charging end positive electrode energy storage tank is connected to the output end of the charging power bin through a positive electrode charging pipeline, the charging end negative electrode energy storage tank is connected to the output end of the charging power bin through a negative electrode charging pipeline, and the input end of the charging power bin is connected to a direct-current power source. The discharge end positive electrode energy storage tank is connected to the input end of the discharge power bin through a positive electrode discharge pipeline, the discharge end negative electrode energy storage tank is connected to the input end of the discharge power bin through a negative electrode discharge pipeline, and the output end of the discharge power bin is connected to a power utilization end. An outlet of the charging end positive electrode energy storage tank is communicated with an inlet of the discharging end positive electrode energy storage tank through a positive electrode conveying pipeline, and an outlet of the charging end negative electrode energy storage tank is communicated with an inlet of the discharging end negative electrode energy storage tank through a negative electrode conveying pipeline. The safety is high, and electric energy shortage and waste can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission networks, and in particular to a liquid flow battery energy storage system. Background Art

[0002] Existing power transmission mainly involves building high-voltage power grid transmission lines to transmit high-voltage and high-power electricity from power stations (thermal power plants, hydropower stations, nuclear power plants) to user locations (such as cities, industrial bases, etc.).

[0003] All high-voltage power transmission lines at home and abroad have always been under manual inspection and maintenance. For safety reasons, high-voltage power grids are usually built in places where few people go; the transmission of electricity in the power grid will consume a certain amount of electricity due to heat generation, resulting in a waste of electricity; at the same time, in order to ensure the safe operation of high-voltage power transmission lines, only a reliability maintenance system can be adopted, that is, using manual means to perform regular, preventive inspections and maintenance operations. Although the reliability maintenance system is the only maintenance method currently available, it is time-consuming, labor-intensive, costly, difficult to detect hidden dangers in time, and there are human factors such as negligence. It is impossible to predict the development of accident hazards, let alone predict potential dangers.

[0004] It can be seen that the existing power transmission has problems of energy waste and low safety. Summary of the invention

[0005] The present invention provides a liquid flow battery energy storage system, which solves the problems of power waste and low safety in the prior art.

[0006] The present invention provides a liquid flow battery energy storage system, comprising a charging unit, a discharging unit and an electrolyte transport unit; the charging unit is located on the power generation side, and the discharging unit is located on the power consumption side;

[0007] The charging unit includes a charging power bin, a positive energy storage tank at the charging end, and a negative energy storage tank at the charging end; the positive energy storage tank at the charging end is connected to the output end of the charging power bin through a positive charging pipeline, and the negative energy storage tank at the charging end is connected to the output end of the charging power bin through a negative charging pipeline, and the input end of the charging power bin is connected to a DC power supply to charge the positive electrolyte in the positive energy storage tank at the charging end and the negative electrolyte in the negative energy storage tank at the charging end;

[0008] The discharge unit includes a discharge power bin, a positive energy storage tank at the discharge end, and a negative energy storage tank at the discharge end. The positive energy storage tank at the discharge end is connected to the input end of the discharge power bin through a positive discharge pipeline, and the negative energy storage tank at the discharge end is connected to the input end of the discharge power bin through a negative discharge pipeline. The output end of the discharge power bin is connected to the power consumption end.

[0009] The electrolyte delivery unit includes a positive electrode delivery pipeline and a negative electrode delivery pipeline. The outlet of the positive electrode energy storage tank at the charging end is connected to the inlet of the positive electrode energy storage tank at the discharging end through the positive electrode delivery pipeline, and the outlet of the negative electrode energy storage tank at the charging end is connected to the inlet of the negative electrode energy storage tank at the discharging end through the negative electrode delivery pipeline.

[0010] Optionally, the electrolyte delivery unit further includes a positive electrode return pipeline and a negative electrode return pipeline;

[0011] The outlet of the positive energy storage tank at the discharge end is connected to the inlet of the positive energy storage tank at the charging end through the positive return line, and the outlet of the negative energy storage tank at the discharge end is connected to the inlet of the negative energy storage tank at the charging end through the negative return line.

[0012] Optionally, there are multiple positive energy storage tanks at the charging end, and the number of positive energy storage tanks at the discharging end matches the number of positive energy storage tanks at the charging end; there are multiple negative energy storage tanks at the charging end, and the number of negative energy storage tanks at the discharging end matches the number of negative energy storage tanks at the charging end.

[0013] Optionally, the inlet of the positive electrode energy storage tank at the discharge end and the inlet of the negative electrode energy storage tank at the discharge end are both provided with liquid inlet control valves.

[0014] Optionally, both the inlet of the positive electrode energy storage tank at the charging end and the inlet of the negative electrode energy storage tank at the charging end are provided with a liquid inlet control valve.

[0015] Optionally, the outlet of the positive electrode energy storage tank at the discharge end and the outlet of the negative electrode energy storage tank at the discharge end are both provided with liquid outlet control valves.

[0016] Optionally, the charging end positive electrode energy storage tank includes a first charging end positive electrode energy storage tank and a second charging end positive electrode energy storage tank, and the discharging end positive electrode energy storage tank includes a first discharging end positive electrode energy storage tank and a second discharging end positive electrode energy storage tank;

[0017] The positive electrode delivery pipeline includes a positive electrode delivery main pipe section, a positive electrode delivery first branch pipe section and a positive electrode delivery second branch pipe section which are connected;

[0018] The positive energy storage tank at the first charging end is connected to the positive energy storage tank at the first discharging end through the positive transport main pipe section, and the positive energy storage tank at the second charging end is connected to the positive energy storage tank at the second discharging end through the positive transport first branch pipe section, the positive transport main pipe section and the positive transport second branch pipe section.

[0019] Optionally, the positive electrode reflux pipeline includes a connected positive electrode reflux main pipe section, a positive electrode reflux first branch pipe section, and a positive electrode reflux second branch pipe section;

[0020] The positive energy storage tank at the first charging end is connected to the positive energy storage tank at the first discharging end through the positive reflux main pipe section, and the positive energy storage tank at the second charging end is connected to the positive energy storage tank at the second discharging end through the positive reflux main pipe section, the positive reflux first branch pipe section and the positive reflux second branch pipe section.

[0021] Optionally, the charging end negative electrode energy storage tank includes a first charging end negative electrode energy storage tank and a second charging end negative electrode energy storage tank, and the discharging end negative electrode energy storage tank includes a first discharging end negative electrode energy storage tank and a second discharging end negative electrode energy storage tank;

[0022] The negative electrode transport pipeline includes a connected negative electrode transport main pipe section, a negative electrode transport first branch pipe section and a negative electrode transport second branch pipe section;

[0023] The first charging end negative energy storage tank is connected to the first discharging end negative energy storage tank through the negative electrode transport main pipe section, and the second charging end negative energy storage tank is connected to the second discharging end negative energy storage tank through the negative electrode transport first branch pipe section, the negative electrode transport main pipe section and the negative electrode transport second branch pipe section.

[0024] Optionally, the negative electrode return pipeline includes a negative electrode return main pipe section, a negative electrode return first branch pipe section and a negative electrode return second branch pipe section that are connected;

[0025] The first charging end negative energy storage tank is connected to the first discharging end negative energy storage tank through the negative reflux main pipe section, and the second charging end negative energy storage tank is connected to the second discharging end negative energy storage tank through the negative reflux main pipe section, the negative reflux first branch pipe section and the negative reflux second branch pipe section.

[0026] The present invention is based on the principle of liquid flow battery. On the power generation side, the generated electric energy is stored in the electrolyte through the charging unit. The positive and negative electrolytes storing the electric energy are transported to the power consumption side through the electrolyte transport unit, and then the electric energy is released through the discharge unit. Since the electrolyte itself is not charged, the present invention can reduce the cost of building the network and safety maintenance. In addition, the present invention can fully allocate electric energy during peak and valley times by setting up electrolyte storage tanks (including positive energy storage tanks at the discharge end and negative energy storage tanks at the discharge end) on the power consumption side and storing the electrolyte in the storage tanks. For example, electric energy is released at peak power consumption and stored at valley power consumption, thereby enabling the power generation side to generate electricity at a stable constant power and avoid power shortage and waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The structure of the liquid flow battery energy storage system according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The structure of the liquid flow battery energy storage system according to the embodiment of the present invention is shown in FIG. Figure 2 .

[0029] Description of reference numerals:

[0030] 1: Flow battery energy storage system;

[0031] 111: charging power bin; 112: positive energy storage tank at charging end; 112A: positive energy storage tank at first charging end; 112B: positive energy storage tank at second charging end; 113: negative energy storage tank at charging end; 113A: negative energy storage tank at first charging end; 113B: negative energy storage tank at second charging end; 114: positive charging circuit; 1141: positive charging bypass; 115: negative charging circuit; 1151: negative charging bypass;

[0032] 121: discharge power bin; 122: discharge end positive electrode energy storage tank; 122A: first discharge end positive electrode energy storage tank; 122B: second discharge end positive electrode energy storage tank; 123: discharge end negative electrode energy storage tank; 123A: first discharge end negative electrode energy storage tank; 123B: second discharge end negative electrode energy storage tank; 124: positive electrode discharge pipeline; 125: negative electrode discharge pipeline;

[0033] 131: positive electrode delivery pipeline; 1311: positive electrode delivery main pipe section; 1312: positive electrode delivery first branch pipe section; 1313: positive electrode delivery second branch pipe section; 132: negative electrode delivery pipeline; 1321: negative electrode delivery main pipe section; 1322: negative electrode delivery first branch pipe section; 1323: negative electrode delivery second branch pipe section;

[0034] 133: positive electrode return pipe; 1331: positive electrode return main pipe section; 1332: positive electrode return first branch pipe section; 1333: positive electrode return second branch pipe section;

[0035] 134: negative electrode return pipe; 1341: negative electrode return main pipe section; 1342: negative electrode return first branch pipe section; 1343: negative electrode return second branch pipe section;

[0036] 141: liquid inlet control valve; 142: liquid inlet control valve; 143: liquid inlet control valve; 144: liquid inlet control valve; 145: liquid inlet control valve; 146: liquid inlet control valve; 147: liquid inlet control valve; 148: liquid inlet control valve; 151: liquid outlet control valve; 152: liquid outlet control valve: 153: liquid outlet control valve; 154: liquid outlet control valve. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0038] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0041] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] The present invention provides a liquid flow battery energy storage system 1, such as Figure 1 As shown, it includes a charging unit, a discharging unit and an electrolyte transport unit. The charging unit is located on the power generation side, and the discharging unit is located on the power consumption side.

[0044] The power generation side may be, for example, power generation units such as power stations and power plants, and the power consumption side may be, for example, urban users, industrial bases, urban substations, etc.

[0045] The charging unit includes a charging power bin 111, a charging end positive energy storage tank 112, and a charging end negative energy storage tank 113. The charging end positive energy storage tank 112 is connected to the output end of the charging power bin 111 through a positive charging line 114, and the charging end negative energy storage tank 113 is connected to the output end of the charging power bin 111 through a negative charging line 115. The input end of the charging power bin 111 is connected to a DC power supply to charge the positive electrolyte in the charging end positive energy storage tank 112 and the negative electrolyte in the charging end negative energy storage tank 113.

[0046] It is understood by those skilled in the art that flow batteries achieve mutual conversion of electrical energy and chemical energy through reversible redox reactions (i.e., reversible changes in valence) of active substances in positive and negative electrolyte solutions. During charging, an oxidation reaction occurs at the positive electrode to increase the valence of the active substance, and a reduction reaction occurs at the negative electrode to reduce the valence of the active substance, and the discharge process is the opposite. The source of the DC power supply can be a DC power supply converted from thermal power generation, photovoltaic power generation, hydropower generation, wind power generation, and other power sources.

[0047] The discharge unit includes a discharge power bin 121, a discharge end positive energy storage tank 122, and a discharge end negative energy storage tank 123. The discharge end positive energy storage tank 122 is connected to the input end of the discharge power bin 121 through a positive discharge pipeline 124, and the discharge end negative energy storage tank 123 is connected to the input end of the discharge power bin 121 through a negative discharge pipeline 125. The output end of the discharge power bin 121 is connected to the power consumption end.

[0048] Those skilled in the art will appreciate that the output end of the discharge power bin 121 may be directly connected to the power consumption end, or may be indirectly connected to the power consumption end after being converted into alternating current by an inverter or other equipment.

[0049] The electrolyte delivery unit includes a positive electrode delivery pipeline 131 and a negative electrode delivery pipeline 132. The outlet of the positive electrode energy storage tank 112 at the charging end is connected to the inlet of the positive electrode energy storage tank 122 at the discharging end through the positive electrode delivery pipeline 131, and the outlet of the negative electrode energy storage tank 113 at the charging end is connected to the inlet of the negative electrode energy storage tank 123 at the discharging end through the negative electrode delivery pipeline 132.

[0050] The present invention is based on the principle of liquid flow battery. On the power generation side, the generated electric energy is stored in the electrolyte through the charging unit (including the charging power bin 111, the charging end positive electrode energy storage tank 112, and the charging end negative electrode energy storage tank 113). The positive and negative electrode electrolytes storing the electric energy are transported to the power consumption side through the electrolyte transport unit, and then the electric energy is released through the discharge unit to achieve long-distance power transmission. Since the electrolyte itself is not charged, the present invention can reduce the cost of building a network and safety maintenance. In addition, the present invention can fully allocate electric energy during peak and valley times by arranging electrolyte storage tanks (including the discharge end positive electrode energy storage tank 122 and the discharge end negative electrode energy storage tank 123) on the power consumption side and storing the electrolyte in the storage tank, for example, releasing electric energy at peak power consumption and storing electric energy at valley power consumption, thereby enabling the power generation side to generate electricity at a stable constant power to avoid power shortage and waste.

[0051] Those skilled in the art will appreciate that the energy storage tanks on the electricity consumption side may be located in a centralized station for distributing electricity to a large number of users, and then distributed to specific users through the centralized station, or they may be directly located at specific users. Therefore, the number of energy storage tanks on the power generation side may be the same as or different from the number of energy storage tanks on the available power side.

[0052] The present invention does not limit the shape and number of each electrolyte energy storage tank, and the energy storage tank can be cylindrical, rectangular cylindrical, spherical, etc. In one embodiment, there are multiple positive energy storage tanks 112 at the charging end, and the number of positive energy storage tanks 122 at the discharge end matches the number of positive energy storage tanks 112 at the charging end; there are multiple negative energy storage tanks 113 at the charging end, and the number of negative energy storage tanks 123 at the discharge end matches the number of negative energy storage tanks 113 at the charging end. Furthermore, the present invention has different pipeline designs corresponding to different numbers of energy storage tanks, and as long as the corresponding electrolyte transportation can be met, it does not depart from the scope of the embodiments of the present application.

[0053] In one embodiment, if Figure 1 As shown, the electrolyte delivery unit further includes a positive electrode return line 133 and a negative electrode return line 134. The outlet of the positive electrode energy storage tank 122 at the discharge end is connected to the inlet of the positive electrode energy storage tank 112 at the charging end through the positive electrode return line 133, and the outlet of the negative electrode energy storage tank 123 at the discharge end is connected to the inlet of the negative electrode energy storage tank 113 at the charging end through the negative electrode return line 134. Through the above-mentioned return lines, the embodiment of the present invention can return the discharged electrolyte to the power generation side, such as the positive electrode energy storage tank 112 at the charging end and the negative electrode energy storage tank 113 at the charging end, so as to realize the closed-loop operation of the charge and discharge system.

[0054] In an example implementation, see Figure 2 , and combined with Figure 1 It is understood that the charging end positive energy storage tank 112 includes a first charging end positive energy storage tank 112A and a second charging end positive energy storage tank 112B, and the discharging end positive energy storage tank 122 includes a first discharging end positive energy storage tank 122A and a second discharging end positive energy storage tank 122B.

[0055] The positive electrode transport pipeline 131 includes a positive electrode transport main pipe section 1311 , a positive electrode transport first branch pipe section 1312 , and a positive electrode transport second branch pipe section 1313 , which are connected to each other.

[0056] The first charging end positive energy storage tank 112A is connected to the first discharging end positive energy storage tank 122A through the positive electrode transport main pipe section 1311, and the second charging end positive energy storage tank 112B is connected to the second discharging end positive energy storage tank 122B through the positive electrode transport first branch pipe section 1312, the positive electrode transport main pipe section 1311 and the positive electrode transport second branch pipe section 1313. Those skilled in the art can understand that, the positive electrode transport first branch pipe section 1312 and the positive electrode transport second branch pipe section 1313 can be understood as bypasses of the positive electrode transport main pipe section 1311, and the three are connected. Therefore, the positive electrode energy storage tank 112A at the first charging end can not only be connected to the positive electrode energy storage tank 122A at the first discharging end through the positive electrode transport main pipe section 1311, but also can be connected to the positive electrode energy storage tank 112B at the second charging end through the positive electrode transport main pipe section 1311 and the positive electrode transport second branch pipe section 1313. The positive electrode energy storage tank 112B at the second charging end can be connected to the positive electrode energy storage tank 122B at the second discharging end through the positive electrode transport main pipe section 1311, the positive electrode transport first branch pipe section 1312 and the positive electrode transport second branch pipe section 1313, and can also be connected to the positive electrode energy storage tank 122A at the first discharging end through the positive electrode transport second branch pipe section 1313 and the positive electrode transport main pipe section 1311.

[0057] Further, such as Figure 2 As shown, the positive electrode return pipeline 133 includes a positive electrode return main pipe section 1331 , a positive electrode return first branch pipe section 1332 , and a positive electrode return second branch pipe section 1333 , which are connected to each other.

[0058] The first charging end positive energy storage tank 112A is connected to the first discharging end positive energy storage tank 122A through the positive return main pipe section 1331, and the second charging end positive energy storage tank 112B is connected to the second discharging end positive energy storage tank 122B through the positive return main pipe section 1331, the positive return first branch pipe section 1332, and the positive return second branch pipe section 1333. Among them, the connection relationship between the positive return pipeline 133 (including the positive return main pipe section 1331, the positive return first branch pipe section 1332, and the positive return second branch pipe section 1333) and the four energy storage tanks (the first charging end positive energy storage tank 112A, the second charging end positive energy storage tank 112B, the first discharging end positive energy storage tank 122A, and the second discharging end positive energy storage tank 122B) is similar to the connection relationship of the aforementioned positive delivery pipeline 131, which will not be repeated here.

[0059] Further, please combine Figure 1 and Figure 2 It is understood that the charging end negative energy storage tank 113 includes a first charging end negative energy storage tank 113A and a second charging end negative energy storage tank 113B, and the discharging end negative energy storage tank 123 includes a first discharging end negative energy storage tank 123A and a second discharging end negative energy storage tank 123B.

[0060] The negative electrode transport pipeline 132 includes a negative electrode transport main pipe section 1321 , a negative electrode transport first branch pipe section 1322 , and a negative electrode transport second branch pipe section 1323 , which are connected to each other.

[0061] The first charging end negative electrode energy storage tank 113A is connected to the first discharging end negative electrode energy storage tank 123A through the negative electrode transport main pipe section 1321, and the second charging end negative electrode energy storage tank 113B is connected to the second discharging end negative electrode energy storage tank 123B through the negative electrode transport first branch pipe section 1322, the negative electrode transport main pipe section 1321 and the negative electrode transport second branch pipe section 1323. Among them, the connection relationship between each pipe section of the negative electrode transport pipeline 132 and each energy storage tank is similar to the connection relationship of the aforementioned positive electrode transport pipeline 131, which will not be repeated here.

[0062] Furthermore, the negative electrode return pipeline 134 includes a negative electrode return main pipe section 1341 , a negative electrode return first branch pipe section 1342 , and a negative electrode return second branch pipe section 1343 , which are connected to each other.

[0063] The first charging end negative energy storage tank 113A is connected to the first discharging end negative energy storage tank 123A through the negative electrode reflux main pipe section 1341, and the second charging end negative energy storage tank 113B is connected to the second discharging end negative energy storage tank 123B through the negative electrode reflux main pipe section 1341, the negative electrode reflux first branch pipe section 1342, and the negative electrode reflux second branch pipe section 1343. Among them, the connection relationship between each pipe section of the negative electrode reflux pipeline 134 and each energy storage tank is similar to the connection relationship of the aforementioned positive electrode delivery pipeline 131, which will not be repeated here.

[0064] Further, such as Figure 2 As shown, the second charging end positive energy storage tank 112B is connected to the positive charging circuit 114 through the positive charging bypass 1141, and the second charging end negative energy storage tank 113B is connected to the negative charging circuit 115 through the negative charging bypass 1151. The second discharging end positive energy storage tank 122B is connected to the positive discharge circuit 124 through a bypass, and the second discharging end negative energy storage tank 123B is connected to the negative discharge circuit 125 through a bypass.

[0065] In one embodiment, if Figure 1 and Figure 2 As shown, the inlet of the discharge end positive electrode energy storage tank 122 and the inlet of the discharge end negative electrode energy storage tank 123 are both provided with liquid inlet control valves, such as liquid inlet control valve 141 and liquid inlet control valve 142 (such as Figure 1 As shown), in a further embodiment, as Figure 2As shown, the inlet of the positive energy storage tank 122A at the first discharge end is provided with a liquid inlet control valve 141, the inlet of the positive energy storage tank 122B at the second discharge end is provided with a liquid inlet control valve 143, the inlet of the negative energy storage tank 123A at the first discharge end is provided with a liquid inlet control valve 142, and the inlet of the negative energy storage tank 123B at the second discharge end is provided with a liquid inlet control valve 144.

[0066] In one embodiment, the inlet of the positive energy storage tank 112 at the charging end and the inlet of the negative energy storage tank 113 at the charging end are both provided with a liquid inlet control valve for controlling the on-off of the positive electrode return line 133, such as a liquid inlet control valve 145 and a liquid inlet control valve 146. Figure 2 As shown, the inlet of the positive energy storage tank 112A at the first charging end is provided with a liquid inlet control valve 145, the inlet of the positive energy storage tank 112B at the second charging end is provided with a liquid inlet control valve 147, the inlet of the negative energy storage tank 113A at the first charging end is provided with a liquid inlet control valve 146, and the inlet of the negative energy storage tank 113B at the second charging end is provided with a liquid inlet control valve 148.

[0067] In one embodiment, the outlet of the discharge end positive electrode energy storage tank 122 and the outlet of the discharge end negative electrode energy storage tank 123 are both provided with a liquid outlet control valve, such as a liquid outlet control valve 151 and a liquid outlet control valve 152, a liquid outlet control valve 153 and a liquid outlet control valve 154 (such as Figure 1 Specifically, in one implementation, as Figure 2 As shown, the outlet of the positive energy storage tank 122A at the first discharge end is provided with a liquid outlet control valve 151 and a liquid outlet control valve 152, the positive energy storage tank 122B at the second discharge end shares the above-mentioned liquid outlet control valve with the first positive energy storage tank 122A at the first discharge end, and the outlet of the negative energy storage tank 123A at the first discharge end is provided with a liquid outlet control valve 153 and a liquid outlet control valve 154, and the negative energy storage tank 123B at the second discharge end shares the above-mentioned liquid outlet control valve with the negative energy storage tank 123A at the first discharge end.

[0068] For an example of a working process, see Figure 2 The charging power tank 111 on the power generation side receives charging from an external power source, and charges the electrolyte in the positive energy storage tank 112A at the first charging end through the positive charging line 114, and charges the electrolyte in the negative energy storage tank 113A at the first charging end through the negative charging line 115. After the above two energy storage tanks are fully charged, switch to the second charging end positive energy storage tank 112B and the second charging end negative energy storage tank 113B, and charge through the positive charging bypass 1141 and the negative charging bypass 1151 respectively. After the above four energy storage tanks are fully charged, if there are other energy storage tanks, switch to the next group of charged energy storage tanks to achieve continuous and uninterrupted charging. Figure 2Only four energy storage tanks are used as an example for explanation. The fully charged first charging end positive energy storage tank 112A injects electrolyte into the first discharge end positive energy storage tank 122A on the power consumption side through the positive electrode delivery pipeline 131 (e.g., the positive electrode delivery main section 1311), and the fully charged first charging end negative energy storage tank 113A injects electrolyte into the first discharge end negative energy storage tank 123A on the user side through the negative electrode delivery pipeline 132 (e.g., the negative electrode delivery main section 1321). When the electrolyte in the first charging end positive energy storage tank 112A and the first charging end negative energy storage tank 113A is used up, switch to the fully charged second charging end positive energy storage tank 112B and the second charging end negative energy storage tank 113B to inject electrolyte into the user side respectively. Among them, the positive energy storage tank 112B at the second charging end injects electrolyte into the positive energy storage tank 122B at the second discharging end through the positive electrode delivery main section 1311, the first positive electrode delivery branch section 1312, and the second positive electrode delivery branch section 1312, and the negative energy storage tank 113B at the second charging end injects electrolyte into the negative energy storage tank 123B at the second discharging end through the negative electrode delivery main section 1321, the first negative electrode delivery branch section 1322, and the second negative electrode delivery branch section 1323. When this group of energy storage tanks is emptied, switch to the next group of fully charged energy storage tanks (if any) to deliver electrolyte to the user side. After the energy storage tanks on the user side are full, the next group of energy storage tanks (if any) can still be switched to fill the electrolyte.

[0069] After the user side tanking is completed, the liquid inlet control valve is closed, and the liquid flows through the positive discharge pipeline 124 and the negative discharge pipeline 125 through the discharge power bin 121 to discharge to the user. First, discharge is performed through the first discharge end positive energy storage tank 122A and the first discharge end negative energy storage tank 123A. After the power is exhausted, the second discharge end positive energy storage tank 122B and the second discharge end negative energy storage tank 123B are switched to continue discharging. When the power of this group of energy storage tanks is emptied, it is switched to the next group of fully charged energy storage tanks (if any) to discharge to the user.

[0070] After the energy storage tank on the user side is exhausted, the electrolyte is refluxed to the energy storage tank on the power generation side through the positive return pipe 133 and the negative return pipe 134. First, the positive energy storage tank 122A at the first discharge end refluxes to the positive energy storage tank 112A at the first charging end through the positive return main section 1331, and the negative energy storage tank 123A at the first discharge end refluxes to the negative energy storage tank 113A at the first charging end through the negative return main section 1341. After all reflux is completed, Then the positive energy storage tank 122B at the second discharge end refluxes to the positive energy storage tank 112B at the second charging end through the positive reflux main section 1331, the first positive reflux branch section 1332, and the second positive reflux branch section 1333, and the negative energy storage tank 123B at the second discharge end refluxes to the negative energy storage tank 113B at the second charging end through the negative reflux main section 1341, the first negative reflux branch section 1342, and the second negative reflux branch section 1343. When this group of energy storage tanks is emptied, switch to the next group of exhausted energy storage tanks to reflux electrolyte to the power generation side. After the energy storage tanks on the power generation side are full, the next group of empty energy storage tanks (if any) can still be switched to fill the electrolyte. After the above exhausted electrolyte flows back to the power generation side, charging can continue, thereby realizing the closed-loop operation of the entire charging and discharging system.

[0071] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A liquid flow battery energy storage system, characterized in that: It includes a charging unit, a discharging unit and an electrolyte transport unit; the charging unit is located on the power generation side, and the discharging unit is located on the power consumption side; The charging unit includes a charging power bin, a positive energy storage tank at the charging end, and a negative energy storage tank at the charging end; the positive energy storage tank at the charging end is connected to the output end of the charging power bin through a positive charging pipeline, and the negative energy storage tank at the charging end is connected to the output end of the charging power bin through a negative charging pipeline, and the input end of the charging power bin is connected to a DC power supply to charge the positive electrolyte in the positive energy storage tank at the charging end and the negative electrolyte in the negative energy storage tank at the charging end; The discharge unit includes a discharge power bin, a discharge end positive energy storage tank, and a discharge end negative energy storage tank. The discharge end positive energy storage tank is connected to the input end of the discharge power bin through a positive discharge pipeline, and the discharge end negative energy storage tank is connected to the input end of the discharge power bin through a negative discharge pipeline. The output end of the discharge power bin is connected to the power consumption end. The electrolyte delivery unit includes a positive electrode delivery pipeline and a negative electrode delivery pipeline. The outlet of the positive electrode energy storage tank at the charging end is connected to the inlet of the positive electrode energy storage tank at the discharging end through the positive electrode delivery pipeline, and the outlet of the negative electrode energy storage tank at the charging end is connected to the inlet of the negative electrode energy storage tank at the discharging end through the negative electrode delivery pipeline.

2. The liquid flow battery energy storage system according to claim 1, characterized in that: The electrolyte delivery unit also includes a positive electrode return pipeline and a negative electrode return pipeline; The outlet of the positive energy storage tank at the discharge end is connected to the inlet of the positive energy storage tank at the charging end through the positive return pipeline, and the outlet of the negative energy storage tank at the discharge end is connected to the inlet of the negative energy storage tank at the charging end through the negative return pipeline.

3. The liquid flow battery energy storage system according to claim 1, characterized in that: There are multiple positive energy storage tanks at the charging end, and the number of positive energy storage tanks at the discharging end matches the number of positive energy storage tanks at the charging end; there are multiple negative energy storage tanks at the charging end, and the number of negative energy storage tanks at the discharging end matches the number of negative energy storage tanks at the charging end.

4. The liquid flow battery energy storage system according to claim 1, characterized in that: The inlet of the positive electrode energy storage tank at the discharge end and the inlet of the negative electrode energy storage tank at the discharge end are both provided with liquid inlet control valves.

5. The liquid flow battery energy storage system according to claim 2, characterized in that: The inlet of the positive electrode energy storage tank at the charging end and the inlet of the negative electrode energy storage tank at the charging end are both provided with liquid inlet control valves.

6. The liquid flow battery energy storage system according to claim 5, characterized in that: The outlet of the positive electrode energy storage tank at the discharge end and the outlet of the negative electrode energy storage tank at the discharge end are both provided with liquid outlet control valves.

7. The liquid flow battery energy storage system according to claim 3, characterized in that: The charging end positive electrode energy storage tank includes a first charging end positive electrode energy storage tank and a second charging end positive electrode energy storage tank, and the discharging end positive electrode energy storage tank includes a first discharging end positive electrode energy storage tank and a second discharging end positive electrode energy storage tank; The positive electrode delivery pipeline comprises a positive electrode delivery main pipe section, a positive electrode delivery first branch pipe section and a positive electrode delivery second branch pipe section which are connected; The first charging end positive energy storage tank is connected to the first discharging end positive energy storage tank through the positive electrode transport main pipe section, and the second charging end positive energy storage tank is connected to the second discharging end positive energy storage tank through the positive electrode transport first branch pipe section, the positive electrode transport main pipe section and the positive electrode transport second branch pipe section.

8. The liquid flow battery energy storage system according to claim 7, characterized in that: The positive electrode reflux pipeline comprises a positive electrode reflux main pipe section, a positive electrode reflux first branch pipe section and a positive electrode reflux second branch pipe section which are connected; The first charging end positive energy storage tank is connected to the first discharging end positive energy storage tank through the positive reflux main pipe section, and the second charging end positive energy storage tank is connected to the second discharging end positive energy storage tank through the positive reflux main pipe section, the positive reflux first branch pipe section and the positive reflux second branch pipe section.

9. The liquid flow battery energy storage system according to claim 3, characterized in that: The charging end negative electrode energy storage tank includes a first charging end negative electrode energy storage tank and a second charging end negative electrode energy storage tank, and the discharging end negative electrode energy storage tank includes a first discharging end negative electrode energy storage tank and a second discharging end negative electrode energy storage tank; The negative electrode delivery pipeline comprises a connected negative electrode delivery main pipe section, a negative electrode delivery first branch pipe section and a negative electrode delivery second branch pipe section; The first charging end negative energy storage tank is connected to the first discharging end negative energy storage tank through the negative electrode transport main pipe section, and the second charging end negative energy storage tank is connected to the second discharging end negative energy storage tank through the negative electrode transport first branch pipe section, the negative electrode transport main pipe section and the negative electrode transport second branch pipe section.

10. The liquid flow battery energy storage system according to claim 9, characterized in that: The negative electrode return pipeline comprises a negative electrode return main pipe section, a negative electrode return first branch pipe section and a negative electrode return second branch pipe section which are connected; The first charging end negative energy storage tank is connected to the first discharging end negative energy storage tank through the negative reflux main pipe section, and the second charging end negative energy storage tank is connected to the second discharging end negative energy storage tank through the negative reflux main pipe section, the negative reflux first branch pipe section and the negative reflux second branch pipe section.

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