Liquid mixing control method and device, flow battery system and storage medium

Abstract

The invention relates to the technical field of flow batteries, and provides a liquid mixing control method and device, a flow battery system and a storage medium. The flow battery comprises a positive electrode electrolyte circulating pipeline, a negative electrode electrolyte circulating pipeline, an electric pile, an electrolyte tank and a partition plate for partitioning the electrolyte tank into a positive electrode electrolyte tank and a negative electrode electrolyte tank, and the positive electrode electrolyte tank and the negative electrode electrolyte tank share the electrolyte tank. The liquid mixing control method comprises the following steps: determining an electrolyte volume difference in a positive electrode electrolyte tank and a negative electrode electrolyte tank; determining a liquid mixing control strategy according to the volume difference of the electrolyte; and the separator is controlled to move according to the liquid mixing control strategy for liquid mixing, so that ions in the positive and negative electrolyte rapidly recover balance, the activity of the electrolyte is improved, the effective active couple concentration in the electrolyte is increased, the battery capacity is recovered, and the charging and discharging efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid flow batteries, and in particular to a liquid mixing control method and device, a liquid flow battery system, and a storage medium. Background Art

[0002] A flow battery is an electrochemical energy storage device that utilizes separate, circulating positive and negative electrolytes. It is a high-performance battery with high capacity, wide application range, and long cycle life, making it a new energy product. A flow battery primarily consists of a stack, a reservoir (for storing the positive and negative electrolytes), and a circulation pump. The stack includes an ion exchange membrane, bipolar plates, and electrodes. The positive and negative reservoirs contain vanadium ion solutions of varying valences. When the flow battery is operating, the positive and negative electrolytes are introduced into the stack via a circulation pump, where redox reactions occur at the electrodes. The positive and negative electrodes of the battery are separated by an ion exchange membrane.

[0003] In related technologies, during the charge and discharge process, ions in the positive and negative electrolytes (such as vanadium ions and hydrogen ions) carry different amounts of water molecules through the ion exchange membrane to the other electrode, resulting in an imbalance in the ions in the electrolyte. The concentration of effective active electrodes in the electrolyte decreases, causing capacity decay, the electrolyte becomes passivated, the electrolyte is not active, and the charge and discharge efficiency becomes low. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a liquid mixing control method, device, flow battery system and storage medium to solve the problems in the related art.

[0005] To achieve the above objectives, a first aspect of an embodiment of the present disclosure provides a liquid mixing control method, which is applied to a controller connected to a flow battery. The flow battery includes a positive electrolyte circulation pipeline, a negative electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrolyte tank and a negative electrolyte tank. The positive electrolyte tank and the negative electrolyte tank share the same electrolyte tank. The liquid mixing control method includes:

[0006] determining a volume difference between the positive electrode electrolyte tank and the negative electrode electrolyte tank;

[0007] determining a liquid mixing control strategy based on the electrolyte volume difference;

[0008] The movement of the partition is controlled according to the liquid mixing control strategy to mix the liquid.

[0009] Optionally, the liquid mixing control strategy includes: a connectivity range and a liquid mixing speed, wherein the connectivity range includes a first connectivity range and a second connectivity range, the first connectivity range being larger than the second connectivity range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed being larger than the second liquid mixing speed;

[0010] The determining of the liquid mixing control strategy according to the electrolyte volume difference includes:

[0011] Obtaining a volume difference ratio according to the electrolyte volume difference and the maximum volume difference;

[0012] comparing the volume difference ratio with a first preset value;

[0013] When the volume difference ratio is greater than the first preset value, determining whether the fuel cell stack is supplying power to the outside;

[0014] When the stack is not powered externally, the connectivity range in the liquid mixing control strategy is determined according to the volume difference ratio, and the liquid mixing speed in the liquid mixing control strategy is determined according to the liquid mixing demand time and the liquid mixing given time.

[0015] Optionally, determining the connectivity range in the mixed liquid control strategy according to the volume difference ratio includes:

[0016] comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value;

[0017] When the volume difference ratio is less than the second preset value, determining the communication range in the liquid mixing control strategy as the second communication range;

[0018] When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range.

[0019] Optionally, determining the liquid mixing speed in the liquid mixing control strategy according to the liquid mixing demand time and the liquid mixing given time includes:

[0020] Compare the required mixing time with the given mixing time;

[0021] When the required liquid mixing time is less than the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined to be the second liquid mixing speed;

[0022] When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined as the first liquid mixing speed.

[0023] Optionally, before determining whether the fuel cell stack is supplying external power, the mixed liquid control method further includes:

[0024] comparing the volume difference ratio and the warning ratio;

[0025] When the volume difference ratio is greater than the warning ratio, determining the connection range in the liquid mixing control strategy as the first connection range, and determining the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed;

[0026] When the volume difference ratio is less than or equal to the warning ratio, the step of determining whether the fuel cell stack supplies external power is performed.

[0027] Optionally, controlling the movement of the partition to mix the liquid according to the liquid mixing control strategy includes:

[0028] According to the connectivity range in the liquid mixing control strategy, controlling the partition to contract and / or fold to mix the liquid;

[0029] According to the liquid mixing speed in the liquid mixing control strategy, the partition is controlled to rotate and / or stir to mix the liquid.

[0030] According to a second aspect of an embodiment of the present disclosure, there is provided a liquid mixing control device, which is applied to a controller connected to a liquid flow battery. The liquid flow battery further includes a positive electrolyte circulation pipeline, a negative electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrolyte tank and a negative electrolyte tank. The positive electrolyte tank and the negative electrolyte tank share the electrolyte tank. The liquid mixing control device includes:

[0031] a first processing module, configured to determine a volume difference between the positive electrode electrolyte tank and the negative electrode electrolyte tank;

[0032] A second processing module is used to determine a liquid mixing control strategy according to the electrolyte volume difference;

[0033] The third processing module is used to control the movement of the partition to mix the liquid according to the liquid mixing control strategy.

[0034] Optionally, the liquid mixing control strategy includes: a connectivity range and a liquid mixing speed, wherein the connectivity range includes a first connectivity range and a second connectivity range, the first connectivity range being larger than the second connectivity range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed being larger than the second liquid mixing speed;

[0035] The second processing module includes:

[0036] a first sub-processing module, configured to obtain a volume difference ratio according to the electrolyte volume difference and the maximum volume difference;

[0037] a second sub-processing module, configured to compare the volume difference ratio with a first preset value;

[0038] a third sub-processing module, configured to determine whether the fuel cell stack is to supply external power if the volume difference ratio is greater than the first preset value;

[0039] The fourth sub-processing module is used to determine the connectivity range in the mixed liquid control strategy according to the volume difference ratio when the fuel cell stack is not powered externally, and to determine the mixing speed in the mixed liquid control strategy according to the mixed liquid demand time and the mixed liquid given time.

[0040] Optionally, the fourth sub-processing module is specifically configured to:

[0041] comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value;

[0042] When the volume difference ratio is less than the second preset value, determining the communication range in the liquid mixing control strategy as the second communication range;

[0043] When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range.

[0044] Optionally, the fourth sub-processing module is specifically configured to:

[0045] Compare the required mixing time with the given mixing time;

[0046] When the required liquid mixing time is less than the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined to be the second liquid mixing speed;

[0047] When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined as the first liquid mixing speed.

[0048] Optionally, the liquid mixing control device further includes:

[0049] a fourth processing module, configured to compare the volume difference ratio with the warning ratio;

[0050] a fifth processing module, configured to, when the volume difference ratio is greater than the warning ratio, determine the connection range in the liquid mixing control strategy as the first connection range, and determine the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed;

[0051] The sixth processing module is configured to determine whether the fuel cell stack supplies power to the outside when the volume difference ratio is less than or equal to the warning ratio.

[0052] Optionally, the third processing module includes:

[0053] A fifth sub-processing module, configured to control the partition to contract and / or fold to mix the liquid according to the connectivity range in the liquid mixing control strategy;

[0054] The sixth sub-processing module is used to control the rotation and / or stirring of the partition to mix the liquid according to the liquid mixing speed in the liquid mixing control strategy.

[0055] According to a third aspect of an embodiment of the present disclosure, there is provided a flow battery system, comprising:

[0056] The liquid flow battery comprises a positive electrode electrolyte circulation pipeline, a negative electrode electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrode electrolyte tank and a negative electrode electrolyte tank, the positive electrode electrolyte tank and the negative electrode electrolyte tank sharing the electrolyte tank;

[0057] A controller is connected to the liquid flow battery and is used to execute a computer program to implement any step of the liquid mixing control method provided in the first aspect of the present disclosure.

[0058] According to a fourth aspect of an embodiment of the present disclosure, a non-temporary computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the program implements any step of the liquid mixing control method provided in the first aspect of the present disclosure.

[0059] By adopting the above technical solution, the volume difference of the electrolyte in the positive electrolyte tank and the negative electrolyte tank is determined, and then the mixing control strategy is determined based on the electrolyte volume difference. Finally, the movement of the partition is controlled according to the mixing control strategy to mix the electrolyte in the positive electrolyte tank and the negative electrolyte tank separated by the partition, so that the ions in the positive and negative electrolytes are quickly restored to balance, the activity of the electrolyte is improved, and the concentration of effective active electrodes in the electrolyte is increased, thereby restoring the battery capacity and improving the charging and discharging efficiency.

[0060] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0062] Figure 1The figure is a schematic structural diagram of a flow battery according to an exemplary embodiment.

[0063] Figure 2 The figure is a flow chart showing a liquid mixing control method according to an exemplary embodiment.

[0064] Figure 3 is a flowchart of sub-steps of step S2 according to an exemplary embodiment.

[0065] Figure 4 is a flow chart showing another liquid mixing control method according to an exemplary embodiment.

[0066] Figure 5 It is a schematic structural diagram of a partition according to an exemplary embodiment.

[0067] Figure 6 is a schematic diagram showing the movement direction of a partition according to an exemplary embodiment.

[0068] Figure 7 It is a schematic structural diagram of another partition according to an exemplary embodiment.

[0069] Figure 8 is a flowchart of sub-steps of step S3 according to an exemplary embodiment.

[0070] Figure 9 is a schematic diagram showing another direction of movement of a partition according to an exemplary embodiment.

[0071] Figure 10 is a schematic diagram showing another direction of movement of a partition according to an exemplary embodiment.

[0072] Figure 11 is a schematic diagram showing another direction of movement of a partition according to an exemplary embodiment.

[0073] Figure 12 It is a schematic structural diagram of another partition according to an exemplary embodiment.

[0074] Figure 13 is a flow chart showing another liquid mixing control method according to an exemplary embodiment.

[0075] Figure 14 is a block diagram of a liquid mixing control device according to an exemplary embodiment.

[0076] Figure 15 The figure is a schematic structural diagram of a flow battery system according to an exemplary embodiment. DETAILED DESCRIPTION

[0077] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0078] In the following description, words such as “first” and “second” are only used for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0079] Before introducing the specific implementation of the present disclosure, first, the application scenario of the present disclosure is described.

[0080] A flow battery is an electrochemical energy storage device that utilizes separate, circulating positive and negative electrolytes. It is a high-performance battery with high capacity, wide application range, and long cycle life, making it a new energy product. A flow battery primarily consists of a stack, a reservoir (for storing the positive and negative electrolytes), and a circulation pump. The stack includes an ion exchange membrane, bipolar plates, and electrodes. The positive and negative reservoirs contain vanadium ion solutions of varying valences. When the flow battery is operating, the positive and negative electrolytes are introduced into the stack via a circulation pump, where redox reactions occur at the electrodes. The positive and negative electrodes of the battery are separated by an ion exchange membrane.

[0081] In related technologies, during the charge and discharge process, ions in the positive and negative electrolytes (such as vanadium ions and hydrogen ions) carry different amounts of water molecules through the ion exchange membrane to the other electrode, resulting in an imbalance in the ions in the electrolyte. The concentration of effective active electrodes in the electrolyte decreases, causing capacity decay, the electrolyte becomes passivated, the electrolyte is not active, and the charge and discharge efficiency becomes low.

[0082] To solve the above technical problems, please refer to Figure 1 The electrolyte tank of the flow battery is divided into a positive electrolyte tank 12 and a negative electrolyte tank 13 by a separator 11 provided therein. The positive electrolyte tank 12 and the negative electrolyte tank 13 share a common electrolyte tank. The positive electrolyte tank 12 is used to store positive electrolyte, while the negative electrolyte tank 13 is used to store negative electrolyte. The flow battery also includes a positive electrolyte circulation line 14, a negative electrolyte circulation line 15, and a cell stack 16. The positive electrolyte in the positive electrolyte tank 12 flows into the cell stack 16 through the positive electrolyte circulation line 14, while the negative electrolyte in the negative electrolyte tank 13 flows into the cell stack 16 through the negative electrolyte circulation line 15. There, the positive electrolyte undergoes an oxidation-reduction reaction and then flows back to the positive electrolyte tank 12 and the negative electrolyte tank 13, respectively.

[0083] It should be understood that separator 11 effectively separates the positive and negative electrolytes, making them independent of each other. Separator 11 does not chemically react with the positive and negative electrolytes, nor does it adversely affect their performance. Separator 11 also provides excellent thermal insulation, preventing the temperatures inside the positive and negative electrolyte tanks from interfering with each other.

[0084] In other embodiments, a positive electrolyte pipeline valve 17 and a positive electrolyte circulation pump 18 may be provided in the positive electrolyte circulation pipeline 14, and a negative electrolyte pipeline valve 19 and a negative electrolyte circulation pump 20 may be provided in the negative electrolyte circulation pipeline 15. Whether the electrolyte flows into the battery stack 16 can be controlled by controlling the corresponding pipeline valves.

[0085] Figure 2 This is a flow chart showing a method for controlling a mixed liquid according to an exemplary embodiment. The mixed liquid control method can be applied to a controller connected to a flow battery. Figure 2 The mixed liquid control method may include steps S1 to S3.

[0086] Step S1 : determining the volume difference between the electrolyte in the positive electrode electrolyte tank 12 and the electrolyte in the negative electrode electrolyte tank 13 .

[0087] The volume of the positive electrolyte in the positive electrolyte tank 12 is measured, the volume of the negative electrolyte in the negative electrolyte tank 13 is measured, and then the difference between the volume of the positive electrolyte and the volume of the negative electrolyte is calculated to obtain the electrolyte volume difference.

[0088] The volume of the positive electrode electrolyte and the volume of the negative electrode electrolyte can be measured by pressure measurement or level measurement.

[0089] Step S2: determining a liquid mixing control strategy based on the electrolyte volume difference.

[0090] The liquid mixing control strategy includes the connectivity range and / or the liquid mixing speed. The liquid mixing control strategy may include only the connectivity range, only the liquid mixing speed, or both the connectivity range and the liquid mixing speed, which is not limited here.

[0091] The corresponding connection range and / or liquid mixing speed is determined according to the electrolyte volume difference.

[0092] Step S3: controlling the movement of the partition 11 to mix the liquid according to the liquid mixing control strategy.

[0093] The movement of the partition 11 is controlled to mix the liquid according to the connectivity range and / or the mixing speed in the mixing control strategy. It can be understood that the movement of the partition 11 is controlled to mix the liquid according to the connectivity range in the mixing control strategy, and / or the movement of the partition 11 is controlled to mix the liquid according to the mixing speed in the mixing control strategy.

[0094] Controlling the movement of the partition 11 to mix the liquid according to the connectivity range in the liquid mixing control strategy can be understood as controlling the partition 11 to contract and / or fold to mix the liquid according to the connectivity range in the liquid mixing control strategy.

[0095] Controlling the movement of the partition 11 to mix the liquid according to the liquid mixing speed in the liquid mixing control strategy can be understood as controlling the partition 11 to rotate and / or stir to mix the liquid according to the liquid mixing speed in the liquid mixing control strategy.

[0096] By determining the volume difference between the positive and negative electrolyte tanks 12 and 13, and then determining a mixing control strategy based on the volume difference, the separator 11 is controlled to move according to the mixing control strategy to mix the electrolytes in the positive and negative electrolyte tanks 12 and 13 separated by the separator 11, so that the ions in the positive and negative electrolytes are quickly restored to balance, the activity of the electrolyte is improved, the concentration of effective active pairs in the electrolyte is increased, and the battery capacity is restored, thereby improving the charge and discharge efficiency.

[0097] In one possible embodiment, the liquid mixing control strategy may include a connectivity range and a liquid mixing speed, wherein the connectivity range includes a first connectivity range and a second connectivity range, the first connectivity range is greater than the second connectivity range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed is greater than the second liquid mixing speed.

[0098] See also Figure 3 , step S2 may include steps S21 to S24.

[0099] Step S21 : obtaining a volume difference ratio according to the electrolyte volume difference and the maximum volume difference.

[0100] The maximum volume difference can be the maximum value of the theoretical volume difference between the volume of the positive electrode electrolyte and the negative electrode electrolyte. At the initial moment, the volume of the positive electrode electrolyte is the same as the volume of the negative electrode electrolyte. The theoretical maximum value of the volume difference is the volume of the initial positive electrode electrolyte*2.

[0101] The volume difference ratio is calculated based on the electrolyte volume difference and the maximum volume difference. This can be understood as calculating the ratio of the electrolyte volume difference to the maximum volume difference, which is the volume difference ratio. The theoretical range of the volume difference ratio is 0-100%, but the preset value is much less than 100% and should be greater than 0.

[0102] Step S22: comparing the volume difference ratio with a first preset value, that is, determining whether the volume difference ratio is greater than the first preset value.

[0103] The first preset value can represent the frequency of liquid mixing. The smaller the first preset value is, the more frequent the liquid mixing is.

[0104] When the volume difference ratio is greater than the first preset value, step S23 is executed; when the volume difference ratio is less than or equal to the first preset value, no operation is performed.

[0105] Step S23: determine whether the fuel cell stack 16 is supplying power to the outside.

[0106] When the battery stack 16 is not supplying power to the outside, step S24 is executed. When the battery stack 16 is supplying power to the outside, no operation is performed.

[0107] Step S24 : determining the connectivity range in the liquid mixing control strategy according to the volume difference ratio, and determining the liquid mixing speed in the liquid mixing control strategy according to the liquid mixing demand time and the liquid mixing given time.

[0108] In a possible implementation, determining the connectivity range in the mixed liquid control strategy based on the volume difference ratio in step S24 may include:

[0109] Comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value;

[0110] When the volume difference ratio is less than a second preset value, the connection range in the liquid mixing control strategy is determined to be the second connection range;

[0111] When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range, wherein the first communication range is greater than the second communication range.

[0112] When the volume difference ratio is small, the liquid is mixed by connecting with a smaller connection range to reduce energy loss.

[0113] When the volume difference ratio is large, the mixing is carried out by connecting with a larger connection range to speed up the completion of the mixing.

[0114] It should be understood that the first preset value and the second preset value can be adjusted according to actual working conditions. The first preset value is smaller than the second preset value, and the second preset value is smaller than the warning ratio.

[0115] In a possible implementation, determining the liquid mixing speed in the liquid mixing control strategy according to the liquid mixing required time and the liquid mixing given time in step S24 may include:

[0116] Compare the required mixing time with the given mixing time;

[0117] When the required mixing time is less than the given mixing time, the mixing speed in the mixing control strategy is determined to be the second mixing speed;

[0118] When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined to be the first liquid mixing speed, wherein the first liquid mixing speed is greater than the second liquid mixing speed. For example, the second liquid mixing speed may be zero.

[0119] The required mixing time can be determined based on the electricity user's needs and can be planned or temporarily scheduled, with no specific restrictions here. The required mixing time can be calibrated in advance based on experiments. The required mixing time is directly related to the mixing speed and can be related to the structure of the electrolyte tank.

[0120] In one possible implementation, see Figure 4 , Figure 4 FIG2 is a flow chart of another liquid mixing control method according to an exemplary embodiment. The liquid mixing control method can be applied to a controller and can include steps S201 to S208.

[0121] Step S201 : determining the electrolyte volume difference between the positive electrode electrolyte tank 12 and the negative electrode electrolyte tank 13 .

[0122] Step S202: Obtaining a volume difference ratio according to the electrolyte volume difference and the maximum volume difference.

[0123] Step S203 : comparing the volume difference ratio with a first preset value, ie, determining whether the volume difference ratio is greater than the first preset value.

[0124] When the volume difference ratio is greater than the first preset value, step S204 is executed; when the volume difference ratio is less than or equal to the first preset value, no operation is performed.

[0125] Step S204 : comparing the volume difference ratio with the warning ratio, ie, determining whether the volume difference ratio is greater than the warning ratio.

[0126] The early warning ratio is greater than the second preset value, and the second preset value is greater than the first preset value.

[0127] When the volume difference ratio is greater than the warning ratio, it indicates that liquid mixing is urgently needed, and step S205 is executed. When the volume difference ratio is less than or equal to the warning ratio, step S206 is executed.

[0128] Step S205 : determining the connection range in the liquid mixing control strategy as the first connection range, and determining the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed.

[0129] The liquid mixing control strategy includes a connectivity range and a liquid mixing speed. The connectivity range includes a first connectivity range and a second connectivity range, wherein the first connectivity range is greater than the second connectivity range. The liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, wherein the first liquid mixing speed is greater than the second liquid mixing speed.

[0130] Step S206 , determining whether the fuel cell stack 16 is supplying power to the outside.

[0131] When the fuel cell stack 16 is not supplying power to the outside, step S207 is executed. When the fuel cell stack 16 is supplying power to the outside, no operation is performed.

[0132] Step S207 : determining the connectivity range in the liquid mixing control strategy according to the volume difference ratio, and determining the liquid mixing speed in the liquid mixing control strategy according to the liquid mixing demand time and the liquid mixing given time.

[0133] Step S208 , controlling the movement of the partition 11 to mix the liquid according to the liquid mixing control strategy.

[0134] By adding a volume difference ratio for comparison with the warning ratio, when liquid mixing is urgently needed, a large first connection range and a fast first liquid mixing speed are set to control the partition 11 to mix the liquid, so as to quickly restore the ions to a balanced state.

[0135] It should be noted that the detailed description of step S201, step S202, step S203, step S206, step S207 and step S208 can refer to step S1, step S21, step S22, step S23, step S24 and step S3 respectively, and will not be repeated here in this embodiment.

[0136] The partition 11 and the structural material of the electrolyte tank can be one or more of polyvinyl chloride (PVC), polycarbonate (PC), polymethyl methacrylate, and polypropylene (PPH). The partition 11 can be a deformable partition 11 with a rotating shaft 111, see Figure 5 The partition 11 includes a rotating shaft 111 and a plate surface 112. The plate surface 112 can rotate around the rotating shaft 111. The two ends of the rotating shaft 111 are fixed to the tank body of the electrolyte tank. The rotating shaft 111 and the plate surface 112 do not react with the electrolyte. The connection between the plate surface 112 and the rotating shaft 111 is well sealed. Before the plate surface 112 rotates, it can change its shape by folding, shrinking, etc. For shrinking as an example, please refer to Figure 6 The plate surface 112 can shrink in the radial direction of the rotation axis 111, shrink in the axial direction of the rotation axis 111, or expand and contract in the axial and radial directions at the same time.

[0137] The fixed end of the rotating shaft 111 can be placed inside the electrolyte tank (without penetrating the electrolyte tank) to improve the sealing of the tank, or it can be placed outside the electrolyte tank to improve the replacement efficiency. The outer surface of the rotating shaft 111 is provided with a track along the axial direction, and the plate 112 can slide along the track. The track does not affect the sealing of the connection between the plate 112 and the slide rail. Figure 7 The plate surface 112 can be arranged perpendicular to the base plate. A heating device 113 and a cooling device 114 are provided within the plate surface 112 to control the temperature within the positive and negative electrolyte tanks 12 and 13. The heating device 113 can be implemented by evenly distributing heating wires within the cavity of the plate surface 112. The heating wires can shrink with the separator 11 and are surrounded by a heat exchange area filled with a high thermal conductivity material. When the shape of the plate surface 112 changes, the heating section of the heating wires can be adjusted at any time. The cooling device 114 can be implemented by cooling water. The partition 11 can use a heating device 113 and a cooling device 114 to control the temperature of the electrolyte in the electrolyte tank in real time within a reasonable temperature range, which can achieve both heating and cooling. It should be understood that the temperature of the end faces on both sides in contact with the electrolyte can be independently controlled, and the temperatures of the end faces on both sides can be increased and decreased at the same time, and the temperature on one side can be increased and the temperature on the other side can be decreased. The partition has a good built-in insulation layer, and the temperatures of the positive electrode electrolyte tank 12 and the negative electrode electrolyte tank 13 will not affect each other.

[0138] In one possible implementation, see Figure 8 , step S3 may include step S31 and step S32.

[0139] Step S31 : According to the communication range in the liquid mixing control strategy, the partition 11 is controlled to shrink and / or fold to mix the liquid.

[0140] The partition 11 can be contracted by fixing one end surface and contracting the other end surface to form a small range of communication, or by contracting both end surfaces at the same time to form a large range of communication. Figure 9 , Figure 9 The lower end of the middle partition 11 is fixed, and it shrinks from the upper end to the lower end. Figure 9 When the upper end surface of the separator 11 is flush with the initial equilibrium liquid level of the electrolyte, the positive and negative electrolytes achieve a second range of communication; when the upper end surface of the separator drops to the lowest point, the positive and negative electrolytes achieve a first range of communication within this example. Figure 10 , Figure 10 The upper end of the middle partition 11 is fixed and shrinks from the lower end to the upper end. Figure 11 , Figure 11The upper end surface of the middle separator 11 shrinks toward the lower end surface, and the lower end surface of the separator 11 shrinks toward the upper end surface, so that both the positive electrode electrolyte and the negative electrode electrolyte can quickly achieve the first communication range.

[0141] The folding of the partition 11 can be done by fixing one end surface and folding the other end surface to form a small area of communication, or by folding both ends simultaneously to form a large area of communication. For example, the lower end surface of the partition 11 can be fixed and folded from the upper end surface toward the lower end surface; the upper end surface of the partition 11 can also be fixed and folded from the lower end surface toward the upper end surface; or the upper end surface of the partition 11 can be contracted toward the lower end surface, while the lower end surface of the partition 11 folds toward the upper end surface.

[0142] Step S32 , according to the liquid mixing speed in the liquid mixing control strategy, the partition 11 is controlled to rotate and / or stir to mix the liquid.

[0143] The control plate surface 112 is controlled to rotate and / or stir around the rotation axis 111 .

[0144] The separator 11 can fully mix the positive electrode electrolyte and the negative electrode electrolyte through actions such as rotation and stirring, thereby improving the mixing efficiency.

[0145] In some embodiments, see Figure 12 The partition includes a rotating shaft 31, a first partition 32 and a second partition 33. The first partition 32 and the second partition 33 are perpendicular to the bottom plate of the electrolyte tank. The rotating shaft 31 is parallel to the bottom plate of the electrolyte tank. Two slide rails 34 are arranged along the rotating shaft 31. The first partition 32 can slide on one of the slide rails, and the second partition 33 can slide on the other slide rail. The rotating shaft 31 is used to drive the first partition 32 and the second partition 33 to rotate. The controller is connected to the rotating shaft 31, the first partition 32, and the second partition 33 respectively. The controller can control the transmission device through the driving device to fold and shrink the first partition 32 and the second partition 33. The first partition 32 and the second partition 33 can be wider as they are closer to the rotating shaft 31 and narrower as they are farther away from the rotating shaft 31. The dotted lines in the first partition 32 and the second partition 33 can represent the folding creases. The controller can control the rotating shaft 31 to drive the first partition 32 and the second partition 33 to rotate so that the positive electrode electrolyte and the negative electrode electrolyte are mixed. In this embodiment, the rotating shaft 31 does not react with the electrolyte, and the connection between the first partition 32, the second partition 33 and the rotating shaft 31 is well sealed. The slide rail 34 does not affect the sealing of the connection between the partition and the slide rail 34.

[0146] Exemplarily, the first separator 32 includes a first plate and a second plate, and the second separator 33 includes a third plate and a fourth plate. The controller can control the first plate to move along the slide rail to overlap with the second plate, or control the third plate to move along the slide rail to overlap with the fourth plate, and control the rotating shaft to drive the overlapping plates to rotate so that the positive electrode electrolyte and the negative electrode electrolyte are mixed.

[0147] For example, the first preset value is 1%, the second preset value is 3%, and the warning ratio is 8%. Figure 13 , Figure 13 FIG. 1 is a flow chart of another liquid mixing control method according to an exemplary embodiment. The liquid mixing control method may include steps S501 to S513:

[0148] Step S501: determine the volume difference ratio.

[0149] The volume difference ratio can be calculated based on the electrolyte volume difference and the maximum volume difference.

[0150] Step S502: determine whether the volume difference ratio is greater than 1%.

[0151] When the volume difference ratio is greater than 1%, step S503 is executed; when the volume difference is less than or equal to 1%, step S512 is executed.

[0152] Step S503: determine whether the volume difference ratio is greater than 8%.

[0153] When the volume difference ratio is greater than 8%, step S504 and step S505 are executed; when the volume difference ratio is less than or equal to 8%, step S506 is executed.

[0154] In step S504 , the battery stack 16 stops charging and supplying power.

[0155] Step S505: large-scale communication and rapid liquid mixing.

[0156] Step S506 , determining whether the fuel cell stack 16 is supplying power to the outside.

[0157] When the fuel cell stack 16 does not supply power to the outside, step S507 is executed. When the fuel cell stack 16 supplies power to the outside, step S512 is executed.

[0158] Step S507 : the battery stack 16 stops charging (if any).

[0159] Step S508: determine whether the volume difference ratio is less than 3%.

[0160] When the volume difference ratio is less than 3%, step S509 is executed; when the volume difference ratio is greater than or equal to 3%, step S510 is executed.

[0161] Step S509: small-scale connectivity.

[0162] Step S510: large-scale connectivity.

[0163] Step S511, determining whether the given mixing time is sufficient.

[0164] If the given mixing time for liquid mixing is sufficient, step S512 is executed; if the given mixing time for liquid mixing is insufficient, step S513 is executed.

[0165] Step S512: no operation.

[0166] Step S513: rapid liquid mixing.

[0167] Step S514: Control the movement of the partition 11 to mix the liquid.

[0168] When the volume difference ratio of the positive and negative electrolytes exceeds the preset value and the stack does not need to be powered externally, the stack stops charging (if any) and other operations, the control pipeline valves are closed, the partition is activated, the positive and negative electrolyte tanks are connected, and the mixing operation begins; if the stack needs to be powered externally, the power supply continues without mixing. The specific action of the partition is related to the volume difference ratio. When the volume difference ratio is small, the partition moves in a small range, and the positive and negative electrolyte storage tanks are connected in a small range to reduce energy loss; when the volume difference ratio is large, the partition moves in a large range, and the positive and negative electrolyte storage tanks are connected in a large range to quickly complete capacity recovery. When the volume difference ratio of the positive and negative electrolytes exceeds the warning ratio, the stack stops charging and power supply operations, and immediately starts large-scale electrolyte connection and rapid mixing operations.

[0169] Based on the same inventive concept, in order to implement the above method embodiment, this embodiment provides a mixed liquid control device 800, which can be applied to a controller connected to a flow battery, see Figure 14 , the liquid mixing control device 800 may include:

[0170] The first processing module 801 is used to determine the electrolyte volume difference between the positive electrode electrolyte tank 12 and the negative electrode electrolyte tank 13;

[0171] The second processing module 802 is used to determine a liquid mixing control strategy according to the electrolyte volume difference;

[0172] The third processing module 803 is used to control the movement of the partition 11 to mix the liquid according to the liquid mixing control strategy.

[0173] Optionally, the liquid mixing control strategy includes: a connection range and a liquid mixing speed, wherein the connection range includes a first connection range and a second connection range, the first connection range is larger than the second connection range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed is larger than the second liquid mixing speed;

[0174] The second processing module 802 includes:

[0175] A first sub-processing module is configured to obtain a volume difference ratio based on the electrolyte volume difference and the maximum volume difference;

[0176] a second sub-processing module, configured to compare the volume difference ratio with a first preset value;

[0177] A third sub-processing module is configured to determine whether the fuel cell stack 16 is supplying power to the outside when the volume difference ratio is greater than a first preset value;

[0178] The fourth sub-processing module is used to determine the connectivity range in the mixed liquid control strategy according to the volume difference ratio when the fuel cell stack 16 is not powered externally, and to determine the mixing speed in the mixed liquid control strategy according to the mixed liquid demand time and the mixed liquid given time.

[0179] Optionally, the fourth sub-processing module is specifically configured to:

[0180] Comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value;

[0181] When the volume difference ratio is less than a second preset value, the connection range in the liquid mixing control strategy is determined to be the second connection range;

[0182] When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range.

[0183] Optionally, the fourth sub-processing module is specifically configured to:

[0184] Compare the required mixing time with the given mixing time;

[0185] When the required mixing time is less than the given mixing time, the mixing speed in the mixing control strategy is determined to be the second mixing speed;

[0186] When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined as the first liquid mixing speed.

[0187] Optionally, the liquid mixing control device 800 further includes:

[0188] a fourth processing module, configured to compare the volume difference ratio with the warning ratio;

[0189] a fifth processing module, configured to, when the volume difference ratio is greater than the warning ratio, determine the connection range in the liquid mixing control strategy as the first connection range and determine the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed;

[0190] The sixth processing module is used to determine whether the fuel cell stack 16 is supplying power to the outside when the volume difference ratio is less than or equal to the warning ratio.

[0191] Optionally, the third processing module 803 may include:

[0192] A fifth sub-processing module, configured to control the partition 11 to contract and / or fold to mix the liquid according to the connectivity range in the liquid mixing control strategy;

[0193] The sixth sub-processing module is used to control the partition 11 to rotate and / or stir to mix the liquid according to the liquid mixing speed in the liquid mixing control strategy.

[0194] Regarding the liquid mixing control device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the liquid mixing control method, and will not be elaborated here.

[0195] In another exemplary embodiment, a flow battery system is provided, comprising a flow battery and a controller:

[0196] The liquid flow battery includes a positive electrode electrolyte circulation pipeline 14, a negative electrode electrolyte circulation pipeline 15, a battery stack 16, an electrolyte tank, and a separator 11 that separates the electrolyte tank into a positive electrode electrolyte tank 12 and a negative electrode electrolyte tank 13. The positive electrode electrolyte tank 12 and the negative electrode electrolyte tank 13 share a common electrolyte tank;

[0197] The controller is connected to the liquid flow battery and is used to execute the computer program to realize the steps of the above-mentioned liquid mixing control method.

[0198] In other embodiments, the flow battery system may further include a memory having a computer program stored therein.

[0199] In other embodiments, see Figure 15 The flow battery system may further include an electrolytic cell device, a new electrolyte replenishing device, and a chemical additive replenishing device.

[0200] The electrolytic cell device includes a positive electrolytic cell pipeline valve 61 provided on the positive electrolyte circulation pipeline 14, an electrolytic cell 63, and a negative electrolytic cell pipeline valve 62 provided on the negative electrolyte circulation pipeline 15. The electrolytic cell 63 is connected to the positive electrolytic cell pipeline valve 61 via an electrolyte inlet pipeline, and the electrolytic cell 63 is connected to the negative electrolytic cell pipeline valve 62 via an electrolyte outlet pipeline. The controller can control whether the electrolyte flows into the electrolytic cell 63 by controlling the positive electrolytic cell pipeline valve 61, and the controller can control whether the electrolyte flows out of the electrolytic cell 63 by controlling the negative electrolytic cell pipeline valve 62.

[0201] The new electrolyte replenishing device includes a new electrolyte storage container 64, a new electrolyte flow controller 65 and a new electrolyte pipeline valve 66. The new electrolyte in the new electrolyte storage container 64 can reach the positive electrode electrolyte tank 12 through the new electrolyte flow controller 65 and the new electrolyte pipeline valve 66 in sequence. The controller can control the flow rate of the new electrolyte during replenishment by controlling the new electrolyte flow controller 65. The controller can control whether to replenish the positive electrode electrolyte tank 12 with new electrolyte through the new electrolyte pipeline valve 66.

[0202] The chemical additive replenishing device includes a chemical additive storage container 67, a chemical additive flow controller 68 and a chemical additive pipeline valve 69. The chemical additives in the chemical additive storage container 67 can reach the negative electrode electrolyte tank 13 through the chemical additive flow controller 68 and the chemical additive pipeline valve 69 in sequence. The controller can control the flow rate of new electrolyte when replenishing through the chemical additive flow controller 68, and the controller can control whether to replenish the chemical additives to the negative electrode electrolyte tank 13 through the chemical additive pipeline valve 69.

[0203] In another exemplary embodiment, a non-transitory computer-readable storage medium is further provided, on which a computer program is stored. When the program is executed by a processor, the steps of any of the above-mentioned liquid mixing control methods are implemented.

[0204] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned liquid mixing control method when executed by the programmable device.

[0205] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0206] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0207] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for controlling a mixed liquid, characterized in that: A controller is applied to a flow battery, the flow battery including a positive electrode electrolyte circulation pipeline, a negative electrode electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrode electrolyte tank and a negative electrode electrolyte tank, the positive electrode electrolyte tank and the negative electrode electrolyte tank sharing the electrolyte tank, the mixed liquid control method comprising: determining a volume difference between the positive electrode electrolyte tank and the negative electrode electrolyte tank; determining a liquid mixing control strategy based on the electrolyte volume difference; The movement of the partition is controlled according to the liquid mixing control strategy to mix the liquid.

2. The liquid mixing control method according to claim 1, wherein: The liquid mixing control strategy includes: a communication range and a liquid mixing speed, wherein the communication range includes a first communication range and a second communication range, the first communication range is larger than the second communication range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed is larger than the second liquid mixing speed; The determining of the liquid mixing control strategy according to the electrolyte volume difference includes: Obtaining a volume difference ratio according to the electrolyte volume difference and the maximum volume difference; comparing the volume difference ratio with a first preset value; When the volume difference ratio is greater than the first preset value, determining whether the fuel cell stack is supplying power to the outside; When the stack is not powered externally, the connectivity range in the liquid mixing control strategy is determined according to the volume difference ratio, and the liquid mixing speed in the liquid mixing control strategy is determined according to the liquid mixing demand time and the liquid mixing given time.

3. The liquid mixing control method according to claim 2, wherein: Determining the connectivity range in the mixed liquid control strategy according to the volume difference ratio includes: comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value; When the volume difference ratio is less than the second preset value, determining the communication range in the liquid mixing control strategy as the second communication range; When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range.

4. The liquid mixing control method according to claim 2, wherein: Determining the liquid mixing speed in the liquid mixing control strategy according to the liquid mixing demand time and the liquid mixing given time includes: Compare the required mixing time with the given mixing time; When the required liquid mixing time is less than the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined to be the second liquid mixing speed; When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined as the first liquid mixing speed.

5. The liquid mixing control method according to claim 2, wherein: Before determining whether the fuel cell stack supplies power to the outside, the mixed liquid control method further includes: comparing the volume difference ratio and the warning ratio; When the volume difference ratio is greater than the warning ratio, determining the connection range in the liquid mixing control strategy as the first connection range, and determining the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed; When the volume difference ratio is less than or equal to the warning ratio, the step of determining whether the fuel cell stack supplies external power is performed.

6. The liquid mixing control method according to claim 2, characterized in that: The controlling the movement of the partition to mix the liquid according to the liquid mixing control strategy includes: According to the connectivity range in the liquid mixing control strategy, controlling the partition to contract and / or fold to mix the liquid; According to the liquid mixing speed in the liquid mixing control strategy, the partition is controlled to rotate and / or stir to mix the liquid.

7. A liquid mixing control device, characterized in that: A controller for use in connection with a flow battery, wherein the flow battery includes a positive electrolyte circulation pipeline, a negative electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrolyte tank and a negative electrolyte tank, wherein the positive electrolyte tank and the negative electrolyte tank share the same electrolyte tank, and the liquid mixing control device includes: a first processing module, configured to determine a volume difference between the positive electrode electrolyte tank and the negative electrode electrolyte tank; A second processing module is used to determine a liquid mixing control strategy according to the electrolyte volume difference; The third processing module is used to control the movement of the partition to mix the liquid according to the liquid mixing control strategy.

8. The liquid mixing control device according to claim 7, characterized in that: The liquid mixing control strategy includes: a communication range and a liquid mixing speed, wherein the communication range includes a first communication range and a second communication range, the first communication range is larger than the second communication range, and the liquid mixing speed includes a first liquid mixing speed and a second liquid mixing speed, the first liquid mixing speed is larger than the second liquid mixing speed; The second processing module includes: a first sub-processing module, configured to obtain a volume difference ratio according to the electrolyte volume difference and the maximum volume difference; a second sub-processing module, configured to compare the volume difference ratio with a first preset value; a third sub-processing module, configured to determine whether the fuel cell stack is to supply external power if the volume difference ratio is greater than the first preset value; The fourth sub-processing module is used to determine the connectivity range in the mixed liquid control strategy according to the volume difference ratio when the fuel cell stack is not powered externally, and to determine the mixing speed in the mixed liquid control strategy according to the mixed liquid demand time and the mixed liquid given time.

9. The liquid mixing control device according to claim 8, characterized in that: The fourth sub-processing module is specifically configured to: comparing the volume difference ratio with a second preset value, wherein the second preset value is greater than the first preset value; When the volume difference ratio is less than the second preset value, determining the communication range in the liquid mixing control strategy as the second communication range; When the volume difference ratio is greater than or equal to the second preset value, the communication range in the liquid mixing control strategy is determined to be the first communication range.

10. The liquid mixing control device according to claim 8, characterized in that: The fourth sub-processing module is specifically configured to: Compare the required mixing time with the given mixing time; When the required liquid mixing time is less than the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined to be the second liquid mixing speed; When the required liquid mixing time is greater than or equal to the given liquid mixing time, the liquid mixing speed in the liquid mixing control strategy is determined as the first liquid mixing speed.

11. The liquid mixing control device according to claim 8, characterized in that: The mixed liquid control device also includes: a fourth processing module, configured to compare the volume difference ratio with the warning ratio; a fifth processing module, configured to, when the volume difference ratio is greater than the warning ratio, determine the connection range in the liquid mixing control strategy as the first connection range, and determine the liquid mixing speed in the liquid mixing control strategy as the first liquid mixing speed; The sixth processing module is configured to determine whether the fuel cell stack supplies power to the outside when the volume difference ratio is less than or equal to the warning ratio.

12. The liquid mixing control device according to claim 8, characterized in that: The third processing module includes: A fifth sub-processing module, configured to control the partition to contract and / or fold to mix the liquid according to the connectivity range in the liquid mixing control strategy; The sixth sub-processing module is used to control the rotation and / or stirring of the partition to mix the liquid according to the liquid mixing speed in the liquid mixing control strategy.

13. A liquid flow battery system, characterized in that: include: The liquid flow battery comprises a positive electrode electrolyte circulation pipeline, a negative electrode electrolyte circulation pipeline, a battery stack, an electrolyte tank, and a separator that separates the electrolyte tank into a positive electrode electrolyte tank and a negative electrode electrolyte tank, the positive electrode electrolyte tank and the negative electrode electrolyte tank sharing the electrolyte tank; A controller is connected to the liquid flow battery and is used to execute a computer program to implement the steps of the liquid mixing control method according to any one of claims 1 to 6.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the liquid mixing control method according to any one of claims 1 to 6 are implemented.

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