Control method of flow battery container

Abstract

The invention discloses a control method of a flow battery container, and relates to the technical field of flow batteries, and the control method comprises the following steps: in a normal working mode, controlling circuits of a conventional electric pile and an auxiliary electric pile to be in grid connection, and performing electrolyte circulation between the conventional electric pile and a positive electrode liquid storage tank and between the auxiliary electric pile and a negative electrode liquid storage tank, charging or discharging the conventional electric pile and the auxiliary electric pile together; in the electric quantity adjusting mode, a circuit of the conventional electric pile is in grid connection, a circuit of the auxiliary electric pile is charged or discharged through a charging and discharging machine, and electrolyte circulation is carried out between the conventional electric pile and the positive electrode liquid storage tank and between the auxiliary electric pile and the negative electrode liquid storage tank; and the auxiliary electric pile adjusts the electrolyte concentration in the positive electrode liquid storage tank and the negative electrode liquid storage tank. And the real-time online regulation of the electric quantity of the flow battery is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow batteries, and in particular to a control method for a liquid flow battery container. Background Art

[0002] Flow batteries, with their advantages of energy and power decoupling, scalability, inherent safety of their water-based electrolytes, and long cycle life, are an ideal choice for large-scale, long-term energy storage. Furthermore, they offer fast response, rapid charge and discharge transitions, and no phase shifts. They can rapidly adjust power within a short period of time, making them suitable for a variety of applications, including frequency modulation, and ensuring the stable operation of the power grid.

[0003] When an electrochemical energy storage power station assists thermal power units in frequency regulation or participates in grid frequency regulation as an independent power source, when the state of charge (SOC) of the electrochemical energy storage power station reaches the preset cutoff condition, the corresponding protection mechanism will be triggered, and the upper and lower bilateral regulation capabilities will be lost. This limits the electrochemical energy storage power station's ability to execute primary and secondary frequency regulation instructions, thereby affecting the frequency regulation benefits of the energy storage power station.

[0004] Existing flow battery container systems primarily utilize stacks connected in series or parallel, using fixed-capacity liquid storage tanks. This design presents low reliability, and single-point failures can easily lead to system failure. Furthermore, a leak in the main tank disrupts the electrolyte supply, complicating maintenance procedures and requiring manual draining and cleaning of residual electrolyte. Summary of the Invention

[0005] The present application provides a control method for a flow battery container to at least solve one technical problem existing in the related art.

[0006] The embodiment of the present application provides a control method for a liquid flow battery container, wherein the liquid flow battery container includes a positive electrode liquid storage tank, a negative electrode liquid storage tank, and a plurality of conventional battery stacks respectively connected to the positive electrode liquid storage tank and the negative electrode liquid storage tank through liquid pipelines; further comprising: a plurality of auxiliary battery stacks respectively connected to the positive electrode liquid storage tank and the negative electrode liquid storage tank through the liquid pipelines; the liquid flow battery container further comprises: a normal operating mode and a power regulation mode; the control method comprises: in the normal operating mode, controlling the circuits of the conventional battery stack and the auxiliary battery stack The conventional fuel cell stack and the auxiliary fuel cell stack are connected to the grid, and the electrolyte circulates between the conventional fuel cell stack and the auxiliary fuel cell stack and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the conventional fuel cell stack and the auxiliary fuel cell stack are charged or discharged together; in the power regulation mode, the circuit of the conventional fuel cell stack is connected to the grid, and the circuit of the auxiliary fuel cell stack is charged or discharged through the charger and discharger, and the electrolyte circulates between the conventional fuel cell stack and the auxiliary fuel cell stack and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the auxiliary fuel cell stack adjusts the electrolyte concentration in the positive electrode liquid storage tank and the negative electrode liquid storage tank.

[0007] As an optional implementation, it includes: obtaining the power status of the liquid flow battery container; determining whether the power status is within a preset power range; if the power status is not within the preset power range, controlling the liquid flow battery container to enter the power regulation mode.

[0008] As an optional embodiment, the liquid flow battery container also includes a battery stack failure mode; in the battery stack failure mode: the circuit of the faulty conventional battery stack and / or the auxiliary battery stack is controlled to be bypassed, the circuits of the non-faulty conventional battery stack and the auxiliary battery stack are connected to the grid, and the circuit voltages of the non-faulty conventional battery stack and the auxiliary battery stack are redistributed; electrolyte circulation is performed between the conventional battery stack and the auxiliary battery stack and the positive electrode storage tank and the negative electrode storage tank, so that the non-faulty conventional battery stack and the auxiliary battery stack can be charged or discharged normally.

[0009] As an optional implementation, the plurality of conventional fuel cell stacks and the plurality of auxiliary fuel cell stacks are respectively provided with a cascade module; the control method further comprises: in the fuel cell stack failure mode, the cascade module controls the circuit bypass of the faulty fuel cell stack.

[0010] As an optional implementation, the control method also includes: controlling each cascade module to obtain real-time operating data of the conventional fuel cell stack and the auxiliary fuel cell stack; judging whether the conventional fuel cell stack or the auxiliary fuel cell stack has a fault based on the real-time operating data of the cascade module; if there is a fault in the conventional fuel cell stack, controlling the flow battery container to enter the fuel cell stack fault mode.

[0011] As an optional embodiment, multiple conventional fuel cell stacks are provided with a first cascade module, and multiple first cascade modules are connected in series and grid-connected to form a circuit of a conventional fuel cell stack; multiple auxiliary fuel cell stacks are provided with a second cascade module, and multiple second cascade modules are connected in series to form a circuit of an auxiliary fuel cell stack; the auxiliary fuel cell stack circuit is connected in parallel with the connecting line between two of the first cascade modules, and the connecting line is provided with a first controllable switch.

[0012] As an optional implementation, a second controllable switch and a third controllable switch are respectively provided at two ends of the auxiliary stack circuit connected to the connecting line.

[0013] As an optional embodiment, it also includes a charging and discharging circuit arranged in parallel with the auxiliary battery stack circuit; the charging and discharging circuit includes the charger and discharger, and the positive and negative poles of the charger and discharger are respectively connected to a fourth controllable switch and a fifth controllable switch.

[0014] As an optional embodiment, the first controllable switch, the fourth controllable switch, and the fifth controllable switch are turned on or off synchronously, and the second controllable switch and the third controllable switch are turned on or off synchronously; and when the first controllable switch, the fourth controllable switch, and the fifth controllable switch are in the on state, the second controllable switch and the third controllable switch are in the off state; when the second controllable switch and the third controllable switch are in the on state, the first controllable switch, the fourth controllable switch, and the fifth controllable switch are in the off state.

[0015] As an optional embodiment, the liquid flow battery container also includes a positive auxiliary liquid storage tank and a negative auxiliary liquid storage tank, and the liquid flow battery container also includes a maintenance mode; in the maintenance mode: disconnect the circuit connection between the conventional battery stack and the auxiliary battery stack; control the electrolyte in the conventional battery stack and the auxiliary battery stack to flow to the positive auxiliary liquid storage tank and the negative auxiliary liquid storage tank; control the electrolyte in the positive auxiliary liquid storage tank and the negative auxiliary liquid storage tank to flow to the positive liquid storage tank and the negative liquid storage tank.

[0016] In an embodiment of the present application, a control method for a liquid flow battery container is provided, wherein the liquid flow battery container includes a positive electrode liquid storage tank, a negative electrode liquid storage tank and a plurality of conventional battery stacks respectively connected to the positive electrode liquid storage tank and the negative electrode liquid storage tank through liquid pipelines; and further includes: a plurality of auxiliary battery stacks; in the normal working mode, the circuits of the conventional battery stacks and the auxiliary battery stacks are controlled to be connected to the grid, and electrolyte circulation is performed between the conventional battery stacks and the auxiliary battery stacks and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the conventional battery stacks and the auxiliary battery stacks are charged or discharged together; in the power regulation mode, the circuits of the conventional battery stacks are connected to the grid, and the circuits of the auxiliary battery stacks are charged or discharged through a charger and discharger, and electrolyte circulation is performed between the conventional battery stacks and the auxiliary battery stacks and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the auxiliary battery stacks adjust the electrolyte concentration in the positive electrode liquid storage tank and the negative electrode liquid storage tank. Through the setting of the auxiliary fuel cell stack and the setting of the power regulation mode, the auxiliary fuel cell stack is in normal working state under normal working mode. Under the power regulation mode, the electrolyte concentration in the positive and negative electrode storage tanks can be adjusted online in real time by connecting to the charger and discharger for charging or discharging, so that the liquid flow battery can achieve real-time online regulation of power. To a certain extent, it no longer limits the ability of the electrochemical energy storage power station to execute primary and secondary frequency regulation instructions, thereby ensuring the frequency regulation benefits of the energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a flow chart of a control method for a flow battery container provided in accordance with an embodiment of the present application.

[0020] Figure 2 It is a structural schematic diagram of a flow battery container provided according to an embodiment of the present application.

[0021] Figure 3 This is a schematic diagram of the electrical connection structure of a flow battery container provided according to an embodiment of the present application.

[0022] Reference numerals

[0023] 11 conventional fuel cell stack, 12 first cascade module;

[0024] 21 auxiliary fuel cell stack, 22 second cascade module, 23 first controllable switch, 24 second controllable switch, 25 third controllable switch, 26 charger / discharger, 27 fourth controllable switch, 28 fifth controllable switch;

[0025] 3 positive electrode liquid storage tank, 4 negative electrode liquid storage tank, 5 positive electrode auxiliary liquid storage tank, 6 negative electrode auxiliary liquid storage tank; 7 circulation pump; 8 control valve. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] like Figure 1-3 As shown, according to one aspect of an embodiment of the present application, a control method for a liquid flow battery container is provided, wherein the liquid flow battery container includes a positive electrode liquid storage tank 3, a negative electrode liquid storage tank 4, and a plurality of conventional battery stacks 11 respectively connected to the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 4 through liquid pipelines; and further includes: a plurality of auxiliary battery stacks 21 respectively connected to the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 4 through the liquid pipelines; the liquid flow battery container also includes: a normal operating mode and a power regulation mode;

[0029] The control method includes:

[0030] In the normal working mode, the circuits of the conventional fuel cell stack 11 and the auxiliary fuel cell stack 21 are controlled to be connected to the grid, and electrolyte circulation is performed between the conventional fuel cell stack 11 and the auxiliary fuel cell stack 21 and the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 4, so that the conventional fuel cell stack 11 and the auxiliary fuel cell stack 21 are charged or discharged together;

[0031] In the power regulation mode, the circuit of the conventional battery stack 11 is connected to the grid, and the circuit of the auxiliary battery stack 21 is charged or discharged through the charger and discharger 26. The electrolyte circulates between the conventional battery stack 11 and the auxiliary battery stack 21 and the positive electrode storage tank 3 and the negative electrode storage tank 4, so that the auxiliary battery stack 21 adjusts the electrolyte concentration in the positive electrode storage tank 3 and the negative electrode storage tank 4.

[0032] By setting the auxiliary stack 21 and the power regulation mode, the auxiliary stack 21 is in a normal working state in the normal working mode. In the power regulation mode, by connecting to the charger and discharger 26 for charging or discharging, the electrolyte concentration in the positive and negative electrode storage tanks can be adjusted online in real time, so that the flow battery can achieve real-time online power regulation. To a certain extent, the ability of the electrochemical energy storage power station to execute primary and secondary frequency regulation instructions is no longer restricted, thereby ensuring the frequency regulation benefits of the energy storage power station. Moreover, in the normal working mode, the auxiliary stack 21 is also the same as the conventional stack 11, participating in charging and discharging normally, ensuring the normal working state of the flow battery container in the normal working mode. At the same time, the auxiliary stack 21 is used to transport electrolyte with the positive electrode storage tank 3 and the negative electrode storage tank 4 in the power regulation mode to adjust the power state of the flow battery container. While ensuring the power regulation capability of the flow battery, the auxiliary stack 21 can also operate normally, thereby ensuring the normal operation of the flow battery container.

[0033] The present application does not limit the specific number of the conventional fuel cell stack 11 and the auxiliary fuel cell stack 21. Figure 2-3 The arrangement shown is provided with 12 conventional fuel cell stacks 11 and 2 auxiliary fuel cell stacks 21, which can also be selected according to actual conditions (such as parameters such as container size). For example, an equal number of conventional fuel cell stacks 11 and auxiliary fuel cell stacks 21 can be provided, or the number of conventional fuel cell stacks 11 can be greater than the number of auxiliary fuel cell stacks 21.

[0034] At the same time, the present application does not limit the volumes of the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 4 and the capacity of the liquid pipeline, and the figures are only examples.

[0035] As an optional implementation, it includes: obtaining the power status of the liquid flow battery container; determining whether the power status is within a preset power range; if the power status is not within the preset power range, controlling the liquid flow battery container to enter the power regulation mode.

[0036] Specifically, in conditions where a flow battery assists a thermal power unit in frequency regulation or participates in grid frequency regulation as an independent power source, when the SOC of the flow battery reaches a preset minimum power value or a preset maximum power value, a corresponding protection mechanism is triggered, causing the flow battery to stop charging or discharging. This results in the flow battery having no upper or lower bilateral regulation capability, limiting the electrochemical energy storage power station's ability to execute primary and secondary frequency regulation instructions, thereby affecting the energy storage power station's frequency regulation benefits. The above-mentioned embodiment, in addition to being provided with a power regulation mode, can also make its own judgment based on the relationship between the power state and the preset power range, automatically controlling the flow battery to enter the power regulation mode when the power state is not within the preset power range. This improves the intelligence level of the flow battery container and also improves the practicality of the flow battery container.

[0037] It should be noted that the present application does not limit the specific numerical value of the preset power range, which can be determined based on the power of the flow battery itself.

[0038] In addition, it should be understood that if the power state is not within the preset power range, controlling the flow battery container to enter the power regulation mode may include: if the power state is less than or equal to the minimum preset power value, controlling the auxiliary battery stack 21 to charge so that the flow battery can continue to work; if the power state is greater than or equal to the minimum preset power value, controlling the auxiliary battery stack 21 to discharge so that the flow battery can continue to work.

[0039] As an optional embodiment, the liquid flow battery container also includes a battery stack failure mode; in the battery stack failure mode: the circuit of the faulty conventional battery stack 11 and / or the auxiliary battery stack 21 is controlled to be bypassed, the circuits of the non-faulty conventional battery stack 11 and the auxiliary battery stack 21 are connected to the grid, and the circuit voltages of the non-faulty conventional battery stack 11 and the auxiliary battery stack 21 are redistributed; electrolyte circulation is performed between the conventional battery stack 11 and the auxiliary battery stack 21 and the positive electrode storage tank 3 and the negative electrode storage tank 4, so that the non-faulty conventional battery stack 11 and the auxiliary battery stack 21 can be charged or discharged normally.

[0040] Specifically, the liquid flow battery can operate normally in normal working mode. If there is a fault in the conventional battery stack 11, the faulty battery stack will not be used, and the circuits of the non-faulty conventional battery stack 11 and the auxiliary battery stack 21 will be connected to the grid, and the circuit voltages of the non-faulty conventional battery stack 11 and the auxiliary battery stack 21 will be redistributed, which can ensure that the circuit of the liquid flow battery container maintains normal operation when the input voltage remains unchanged, and can achieve instantaneous bypass of the faulty battery stack while ensuring the normal operation of the entire liquid flow container. This design ensures that the system can still operate stably when a single or multiple battery stacks fail, significantly reducing the risk of overall downtime due to local failures.

[0041] As an optional embodiment, the plurality of conventional fuel cell stacks 11 and the plurality of auxiliary fuel cell stacks 21 are respectively provided with cascade modules; the control method further comprises: in the fuel cell stack failure mode, the cascade module controls the circuit bypass of the faulty fuel cell stack.

[0042] By providing a cascade module in each conventional fuel cell stack 11 and auxiliary fuel cell stack 21, it is possible to quickly bypass the faulty fuel cell stack and quickly redistribute the circuit voltage of the non-faulty conventional fuel cell stack 11 and the auxiliary fuel cell stack 21 when a fuel cell stack fails.

[0043] As an optional implementation, the control method also includes: controlling each cascade module to obtain real-time operating data of the conventional fuel cell stack 11 and the auxiliary fuel cell stack 21; judging whether the conventional fuel cell stack 11 or the auxiliary fuel cell stack 21 is faulty based on the real-time operating data of the cascade module; if there is a fault in the conventional fuel cell stack 11, controlling the flow battery container to enter the fuel cell stack fault mode.

[0044] Through the setting of the cascade module, the real-time operating data of each conventional battery stack 11 and the auxiliary battery stack 21 can be quickly obtained. At the same time, the faulty battery stack can be quickly identified, and the liquid flow battery container can be controlled to enter the battery stack failure mode in time, thereby improving the intelligence and practicality of the liquid flow battery.

[0045] At the same time, the cascade module can be a DC / DC cascade module or an AC / DC cascade module. This application does not limit this. The DC / DC cascade module can be connected to the PCS grid and is suitable for efficient energy management on the DC side; the AC / DC cascade module is directly connected to the AC three-phase grid, which simplifies the topology. Users can freely choose the configuration according to the grid scenario, and it has strong compatibility. By increasing or decreasing the number of battery stacks or the capacity of the liquid storage tank (such as the design of the auxiliary liquid storage tank), the system can quickly expand or adjust the energy storage scale to adapt to the volatility of new energy power stations.

[0046] As an optional embodiment, multiple conventional fuel cell stacks 11 are provided with a first cascade module 12, and multiple first cascade modules 12 are connected in series and grid-connected to form a circuit of the conventional fuel cell stack 11; multiple auxiliary fuel cell stacks 21 are provided with a second cascade module 22, and multiple second cascade modules 22 are connected in series to form a circuit of the auxiliary fuel cell stack 21; the auxiliary fuel cell stack 21 circuit is connected in parallel with the connecting line between two of the first cascade modules 12, and the connecting line is provided with a first controllable switch 23.

[0047] Multiple first cascade modules 12 and multiple second cascade modules 22 are simply arranged in series, and at the same time, the auxiliary battery stack 21 circuit is connected in parallel with the connecting line between two of the first cascade modules 12. The connecting line is provided with a first controllable switch 23. Through a simple connection method, a circuit can be realized to control whether the auxiliary battery stack 21 participates in normal operation, that is, when the first controllable switch 23 is closed, the auxiliary battery stack 21 does not participate in the normal charging and discharging of the conventional battery stack 11, and when the first controllable switch 23 is disconnected, the auxiliary battery stack 21 participates in the normal charging and discharging of the conventional battery stack 11, that is, the liquid flow battery is in a normal working state.

[0048] As an optional implementation, a second controllable switch 24 and a third controllable switch 25 are respectively provided at two ends of the auxiliary fuel cell stack 21 circuit connected to the connection line.

[0049] like Figure 3 As shown, in the normal operating mode and the battery stack failure mode, the first controllable switch 23 is disconnected, the second controllable switch 24 and the third controllable switch 25 are closed, and the auxiliary battery stack 21 and the conventional battery stack 11 are charged and discharged normally; in the power regulation mode, the first controllable switch 23 is closed, the second controllable switch 24 and the third controllable switch 25 are disconnected, and the auxiliary battery stack 21 is bypassed and connected to the charger and discharger 26 for charging and discharging.

[0050] As an optional embodiment, it also includes a charging and discharging circuit arranged in parallel with the auxiliary battery stack 21 circuit; the charging and discharging circuit includes the charger and discharger 26, and the positive and negative poles of the charger and discharger 26 are respectively connected to the fourth controllable switch 27 and the fifth controllable switch 28.

[0051] Specifically, in the power regulation mode, when adjusting the power SOC, the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are closed, and the second controllable switch 24 and the third controllable switch 25 are opened. That is, the auxiliary battery stack 21 is connected to the charger and discharge machine 26 through the second cascade module 22 to access the station power supply, and the electrolyte concentration in the positive and negative electrode storage tanks 4 is adjusted by controlling the charging and discharging of the auxiliary battery stack 21 to achieve the effect of adjusting the SOC. By controlling the connection between the auxiliary battery stack 21 and the station power supply, the positive and negative electrode electrolyte concentrations can be adjusted independently, realizing real-time dynamic management of the system state of charge (SOC), and avoiding the problem of limited frequency modulation capability caused by the SOC reaching the cut-off condition during the frequency modulation process.

[0052] As an optional embodiment, the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are turned on or off synchronously, and the second controllable switch 24 and the third controllable switch 25 are turned on or off synchronously; and when the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are in the on state, the second controllable switch 24 and the third controllable switch 25 are in the off state; when the second controllable switch 24 and the third controllable switch 25 are in the on state, the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are in the off state.

[0053] By setting the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 to be turned on or off synchronously, and the second controllable switch 24 and the third controllable switch 25 to be turned on or off synchronously, when the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are in the on state, the second controllable switch 24 and the third controllable switch 25 are in the off state; when the second controllable switch 24 and the third controllable switch 25 are in the on state, the first controllable switch 23, the fourth controllable switch 27 and the fifth controllable switch 28 are in the off state, which can ensure the normal operation of the power regulation mode, the normal working mode and the battery stack failure mode, thereby improving the working stability of the liquid flow battery container.

[0054] As an optional embodiment, the liquid flow battery container also includes a positive auxiliary liquid storage tank 5 and a negative auxiliary liquid storage tank 6, and the liquid flow battery container also includes a maintenance mode; in the maintenance mode: disconnect the circuit connection between the conventional battery stack 11 and the auxiliary battery stack 21; control the electrolyte in the conventional battery stack 11 and the auxiliary battery stack 21 to flow to the positive auxiliary liquid storage tank 5 and the negative auxiliary liquid storage tank 6; control the electrolyte in the positive auxiliary liquid storage tank 5 and the negative auxiliary liquid storage tank 6 to flow to the positive liquid storage tank 3 and the negative liquid storage tank 4.

[0055] Specifically, the flow battery container is also equipped with a positive electrode auxiliary liquid storage tank 5 and a negative electrode auxiliary liquid storage tank 6. The flow battery container also includes a maintenance mode; during maintenance, the electrolyte is completely drained from the battery stack into the auxiliary liquid storage tanks and then transferred to the main tank. This design avoids the complex process of manually handling residual electrolyte during flow battery maintenance, reduces operational risks, and shortens downtime.

[0056] As an optional embodiment, the liquid flow battery container also includes a positive auxiliary liquid storage tank 5 and a negative auxiliary liquid storage tank 6. The multiple conventional battery stacks 11 and the multiple auxiliary battery stacks 21 are connected to the positive auxiliary liquid storage tank 5 and the negative auxiliary liquid storage tank 6 through liquid pipelines. The positive auxiliary liquid storage tank 5 and the negative auxiliary liquid storage tank 6 are also connected to the positive liquid storage tank 3 and the negative liquid storage tank 4 respectively through liquid pipelines.

[0057] Specifically, if Figure 2-3As shown, multiple conventional battery stacks 11 are connected to the positive electrode liquid storage tank 3 through the first positive electrode liquid pipeline, and are connected to the negative electrode liquid storage tank 4 through the first negative electrode liquid pipeline; multiple conventional battery stacks 11 are provided with a first cascade module 12, and multiple first cascade modules 12 are connected in series and grid-connected to form a conventional battery stack 11 circuit; the auxiliary battery stack 21 includes multiple auxiliary battery stacks 21, and multiple auxiliary battery stacks 21 are connected to the positive electrode liquid storage tank 3 through the second positive electrode liquid pipeline, and are connected to the negative electrode liquid storage tank 4 through the second negative electrode liquid pipeline; multiple auxiliary battery stacks 21 are provided with a second cascade module 22, and multiple second cascade modules 22 are connected in series to form an auxiliary battery stack 21 circuit.

[0058] The plurality of conventional battery stacks 11 are connected to the positive auxiliary liquid storage tank 5 via a third positive liquid pipeline and to the negative auxiliary liquid storage tank 6 via a third negative liquid pipeline. The plurality of auxiliary battery stacks 21 are connected to the positive auxiliary liquid storage tank 5 via a fourth positive liquid pipeline and to the negative auxiliary liquid storage tank 6 via a fourth negative liquid pipeline. The positive auxiliary liquid storage tank 5 and the negative auxiliary liquid storage tank 6 are connected to the positive liquid storage tank 3 and the negative liquid storage tank 4, respectively, via a positive connection pipeline and a negative connection pipeline. A circulation pump 7 is provided at the output ends of the positive auxiliary liquid storage tank 5, the negative auxiliary liquid storage tank 6, the positive liquid storage tank 3, and the negative liquid storage tank 4.

[0059] The first positive electrode liquid pipeline and the second positive electrode liquid pipeline, the third positive electrode liquid pipeline and the fourth positive electrode liquid pipeline, the first negative electrode liquid pipeline and the second negative electrode liquid pipeline, and the third negative electrode liquid pipeline and the fourth negative electrode liquid pipeline are all connected in series. A plurality of control valves 8 are also included, which are respectively arranged between the first positive electrode liquid pipeline and the second positive electrode liquid pipeline, the third positive electrode liquid pipeline and the fourth positive electrode liquid pipeline, the first negative electrode liquid pipeline and the second negative electrode liquid pipeline, and the third negative electrode liquid pipeline and the fourth negative electrode liquid pipeline.

[0060] Specifically, multiple pipelines are connected in series, such as Figure 2 As shown, it is possible to ensure that the system can still operate stably, dynamically adjust the power, and ensure maintenance risks when a single or multiple battery stacks fail, while greatly shortening the length of the liquid pipeline and the space occupied, further improving the space utilization of the container, reducing production costs, and improving the practicality of the liquid flow battery.

[0061] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0062] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above-mentioned computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling one or more electronic devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application.

[0063] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, and can be electrical or other forms.

[0065] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected based on actual needs to achieve the purpose of the solution provided in this embodiment.

[0066] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0067] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0068] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A control method for a flow battery container, characterized in that: The flow battery container includes a positive electrode liquid storage tank, a negative electrode liquid storage tank, and a plurality of conventional battery stacks respectively connected to the positive electrode liquid storage tank and the negative electrode liquid storage tank through liquid pipelines; and further includes: a plurality of auxiliary battery stacks respectively connected to the positive electrode liquid storage tank and the negative electrode liquid storage tank through the liquid pipelines; the flow battery container also includes: a normal operating mode and a power regulation mode; the control method includes: In the normal working mode, the circuits of the conventional fuel cell stack and the auxiliary fuel cell stack are controlled to be connected to the grid, and electrolyte is circulated between the conventional fuel cell stack and the auxiliary fuel cell stack and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the conventional fuel cell stack and the auxiliary fuel cell stack are charged or discharged together; In the power regulation mode, the circuit of the conventional fuel cell stack is connected to the grid, the circuit of the auxiliary fuel cell stack is charged or discharged through a charger and discharger, and electrolyte circulation is performed between the conventional fuel cell stack and the auxiliary fuel cell stack and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the auxiliary fuel cell stack can adjust the electrolyte concentration in the positive electrode liquid storage tank and the negative electrode liquid storage tank in real time online.

2. The control method of the flow battery container according to claim 1, characterized in that: include: Obtaining the power status of the flow battery container; Determining whether the power state is within a preset power range; If the power state is not within the preset power range, the flow battery container is controlled to enter the power regulation mode.

3. The control method of the flow battery container according to claim 1, characterized in that: The flow battery container also includes a stack failure mode; in the stack failure mode: Control the circuit bypass of the faulty conventional fuel cell stack and / or the auxiliary fuel cell stack, connect the circuits of the non-faulty conventional fuel cell stack and the auxiliary fuel cell stack to the grid, and redistribute the circuit voltages of the non-faulty conventional fuel cell stack and the auxiliary fuel cell stack; circulate electrolyte between the conventional fuel cell stack and the auxiliary fuel cell stack and the positive electrode liquid storage tank and the negative electrode liquid storage tank, so that the non-faulty conventional fuel cell stack and the auxiliary fuel cell stack can be charged or discharged normally.

4. The control method of the flow battery container according to claim 3, characterized in that: The plurality of conventional fuel cell stacks and the plurality of auxiliary fuel cell stacks are respectively provided with cascade modules; The control method further includes: In the stack failure mode, the cascade module controls the circuit bypass of the faulty stack.

5. The control method of the flow battery container according to claim 4, characterized in that: The control method further includes: Control each cascade module to obtain real-time operating data of conventional fuel cell stacks and auxiliary fuel cell stacks; Determining whether the conventional fuel cell stack or the auxiliary fuel cell stack has a fault based on real-time operating data of the cascade module; If there is a fault in the conventional battery stack, the flow battery container is controlled to enter the battery stack fault mode.

6. The control method of the flow battery container according to claim 4, characterized in that: Multiple conventional fuel cell stacks are provided with a first cascade module, and multiple first cascade modules are connected in series and grid-connected to form a circuit of a conventional fuel cell stack; multiple auxiliary fuel cell stacks are provided with a second cascade module, and multiple second cascade modules are connected in series to form a circuit of an auxiliary fuel cell stack; the auxiliary fuel cell stack circuit is connected in parallel with the connecting line between two of the first cascade modules, and the connecting line is provided with a first controllable switch.

7. The control method of the flow battery container according to claim 6, characterized in that: A second controllable switch and a third controllable switch are respectively provided at two ends of the auxiliary stack circuit connected to the connecting line.

8. The control method of the flow battery container according to claim 7, characterized in that: It also includes a charging and discharging circuit arranged in parallel with the auxiliary battery stack circuit; the charging and discharging circuit includes the charging and discharging machine, and the positive and negative poles of the charging and discharging machine are respectively connected to a fourth controllable switch and a fifth controllable switch.

9. The control method for a flow battery container according to claim 8, wherein: The first controllable switch, the fourth controllable switch, and the fifth controllable switch are turned on or off synchronously, and the second controllable switch and the third controllable switch are turned on or off synchronously; and when the first controllable switch, the fourth controllable switch, and the fifth controllable switch are in the on state, the second controllable switch and the third controllable switch are in the off state, and when the second controllable switch and the third controllable switch are in the on state, the first controllable switch, the fourth controllable switch, and the fifth controllable switch are in the off state.

10. The control method of the flow battery container according to claim 1, characterized in that: The flow battery container further includes a positive auxiliary liquid storage tank and a negative auxiliary liquid storage tank, and the flow battery container further includes a maintenance mode; in the maintenance mode: Disconnecting the circuit connection between the conventional fuel cell stack and the auxiliary fuel cell stack; Controlling the electrolyte in the conventional fuel cell stack and the auxiliary fuel cell stack to flow to the positive electrode auxiliary liquid storage tank and the negative electrode auxiliary liquid storage tank; The electrolyte in the positive electrode auxiliary liquid storage tank and the negative electrode auxiliary liquid storage tank is controlled to flow to the positive electrode storage tank and the negative electrode storage tank.

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