Container-based inter-container balance control method for large-scale flow battery box

Abstract

The invention belongs to the technical field of equipment inspection, and provides a container-based inter-container balance control method for a large-scale flow battery box, and the method comprises the following steps: when it is monitored that the electrolyte transmission difference of each flow battery unit exceeds a first threshold value, adjusting the transmission control parameter of each flow battery unit; when monitoring that the thermal management difference of each flow battery unit exceeds a second threshold value, adjusting the thermal management control parameter of each flow battery unit; and when it is monitored that the OCV difference of each flow battery unit exceeds a third threshold value, adjusting the transmission control parameter and the thermal management control parameter of each flow battery unit. According to the invention, the performance difference between the flow battery units is monitored, the corresponding performance parameters are controlled and adjusted, the balance operation control of the flow battery is realized based on the balance process, and the efficiency of the flow battery is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical energy storage, and in particular, relates to a container-based large-scale liquid flow battery box-to-box balancing control method. Background Art

[0002] Renewable energy sources such as solar energy and wind energy are random and intermittent, so energy storage technology is needed to ensure stable power output. Liquid flow batteries are a new type of energy storage battery that is currently developing rapidly. Compared with lead-acid batteries and nickel-hydrogen batteries, they have the advantages of large capacity, support for frequent high-current charging and discharging, strong scalability, and long life.

[0003] In large-scale liquid flow energy storage systems, in order to provide higher power supply voltage and energy storage capacity, it is necessary to connect multiple single cell stacks in series and parallel to form a liquid flow battery group, and configure corresponding storage tanks, modularize them into container products of certain specifications, and form container-type liquid flow batteries. Due to differences in internal materials and structures, the single cell stacks in container-type liquid flow batteries will lead to differences in flow resistance, internal resistance, etc., which will lead to inconsistent voltages of the stacks during charging and discharging, and ultimately cause overcharging or over-discharging of the battery. In order to prevent the battery from overcharging, when one of the containers in series reaches the cut-off voltage, the other stacks on the branch are also forced to stop, resulting in different depths of electrolyte charge and discharge between different containers, and the overall electrolyte utilization rate is reduced. In order to improve the utilization rate of the electrolyte and make the liquid flow battery operate efficiently, the existing technology will add a balancing control strategy to achieve voltage and capacity balance between containers.

[0004] At present, balancing control is usually studied and implemented from the perspective of balancing circuits, and there is no research and application from the perspective of process design, that is, to improve the balancing of large-scale liquid flow battery energy storage systems through measures such as process system and equipment transformation and process parameter adjustment. Therefore, how to achieve the operation control of the balancing of liquid flow batteries based on the balancing process to improve the efficiency of liquid flow batteries is a problem that needs to be solved in this field. Summary of the invention

[0005] To solve the above problems, the present disclosure provides a liquid flow battery balancing control method, device, electronic device and storage medium, which aims to achieve operational control of the balance of the liquid flow battery from the aspect of the balancing process to improve the efficiency of the liquid flow battery.

[0006] In order to achieve the above objectives, the present disclosure mainly provides the following technical solutions:

[0007] In a first aspect, the present disclosure provides a flow battery balancing control method, comprising:

[0008] When it is monitored that the electrolyte transmission difference of each flow battery unit exceeds a first threshold, adjusting the transmission control parameters of each flow battery unit;

[0009] When it is monitored that the thermal management difference of each liquid flow battery unit exceeds a second threshold, adjusting the thermal management control parameters of each liquid flow battery unit;

[0010] When it is monitored that the OCV difference of each flow battery unit exceeds a third threshold, the transmission control parameter and the thermal management control parameter of each flow battery unit are adjusted.

[0011] In a second aspect, the present disclosure provides a flow battery balancing control device, the device comprising: a first adjustment unit, configured to adjust a transmission control parameter of each flow battery unit when a difference in electrolyte transmission of each flow battery unit is detected to exceed a first threshold;

[0012] A second adjustment unit, configured to adjust the thermal management control parameters of each liquid flow battery unit when it is monitored that the thermal management difference of each liquid flow battery unit exceeds a second threshold;

[0013] The third adjustment unit is used to adjust the transmission control parameters and thermal management control parameters of each liquid flow battery unit when it is monitored that the OCV difference of each liquid flow battery unit exceeds a third threshold.

[0014] On the other hand, the present disclosure further provides a storage medium, which is used to store a computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method of the first aspect above.

[0015] On the other hand, the present disclosure also provides an electronic device, comprising at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; and the processor is used to call program instructions in the memory to execute the method of the first aspect as described above.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present disclosure monitors whether the electrolyte transmission difference, thermal management difference, and OCV difference of each liquid flow battery unit exceed the corresponding threshold value. If exceeded, the corresponding performance parameters are adjusted to reduce the electrolyte transmission delay difference, thermal management control difference, and OCV difference between each liquid flow battery unit. By reducing the performance differences, the overall balance of each liquid flow battery unit is ensured. The present disclosure sets an electrical master control unit in the liquid flow battery energy storage system, and uses the electrical master control unit to monitor and adjust the performance parameters of each liquid flow battery unit to achieve balanced operation of each liquid flow battery. The present disclosure realizes the balance control of the liquid flow battery energy storage system from the perspective of the balance process.

[0018] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of a flow battery energy storage system according to an embodiment of the present disclosure is shown;

[0021] Figure 2 A schematic diagram of a flow battery balancing control method according to an embodiment of the present disclosure is shown;

[0022] Figure 3 A schematic diagram of the in-box balancing control steps according to an embodiment of the present disclosure is shown;

[0023] Figure 4 A performance difference diagram of the No. 1 box flow battery cell and the No. 2 box flow battery cell according to an embodiment of the present disclosure is shown;

[0024] Figure 5 shows a transmission control parameter difference performance diagram according to an embodiment of the present disclosure;

[0025] Figure 6 A schematic structural diagram of a flow battery balancing control device according to an embodiment of the present disclosure is shown;

[0026] Figure 7 A schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] Existing large-scale liquid flow battery energy storage systems usually achieve the balance of liquid flow battery voltage or capacity through a balancing circuit. The embodiment of the present disclosure provides an operation control method for the balance within and between containers of a liquid flow battery energy storage system from the aspect of the balancing process. The embodiment of the present disclosure is generally applicable to aqueous liquid flow batteries (supporting electrolytes are neutral or acidic, such as sulfuric acid, hydrochloric acid, and mixed acid systems), and is applicable to liquid flow battery energy storage systems of various sizes. The liquid flow battery energy storage system of the embodiment of the present disclosure includes one electrical master control unit and multiple liquid flow battery cells, and the electrical master control unit and each liquid flow battery cell are respectively located in their own containers. Figure 1 As shown, the electrical master control unit T1 controls the No. 1 box flow battery unit and the No. 2 box flow battery unit to achieve balanced operation between the flow battery units (between boxes) and inside the flow battery units (inside boxes). The No. 1 box flow battery unit includes positive and negative electrolyte storage tanks (TK0101, TK0102), battery stacks (CS0101, CS0102), positive and negative electrolyte circulation pumps (PU0101, PU0102), electrolyte delayed transmission control components (FL01), capacity balance control components (AH0101, AH0102), thermal management control components (TE0101, TE0102), flow battery unit OCV (O1), measuring instruments and corresponding pipelines and fittings. Similarly, the No. 2 box of liquid flow battery units includes positive and negative electrolyte storage tanks (TK0201, TK0202), battery stacks (CS0201, CS0202), positive and negative electrolyte circulation pumps (PU0201, PU0202), electrolyte delayed transmission control components (FL02), capacity balancing control components (AH0201, AH0202), thermal management control components (TE0201, TE0202), liquid flow battery unit OCV (O2), measuring instruments and corresponding pipelines and fittings.

[0029] It should be noted that Figure 1 It is only a schematic diagram, and the number of flow battery units and the number of devices in the flow battery units can be increased according to the actual scenario. In addition, the flow battery energy storage system of the embodiment of the present disclosure can be a containerized modular process system or a non-containerized modular process system.

[0030] Accordingly, the present disclosure provides a flow battery balancing control method, such as Figure 2 As shown, the flow battery balancing control method of the embodiment of the present disclosure includes:

[0031] 101. When it is monitored that the electrolyte transmission difference of each liquid flow battery unit exceeds a first threshold, adjust the transmission control parameters of each liquid flow battery unit.

[0032] Among them, the liquid flow battery of the embodiment of the present disclosure can be various liquid flow batteries such as all-vanadium, zinc-iron, iron-chromium, etc. The liquid flow battery unit includes: a battery stack, an electrolyte delayed transmission control component, a capacity balancing control component, a thermal management control component, etc. The electrolyte delayed transmission control component is used to control the transmission control parameters of the corresponding battery stack. The capacity balancing control component is used to control the capacity management parameters of the corresponding battery stack, and the thermal management control component is used to control the thermal management control parameters of the corresponding battery stack. The transmission control parameters of the liquid flow battery unit are the sum of the transmission control parameters of each battery stack in the corresponding liquid flow battery unit.

[0033] In this step, the electrical master control unit reads the transmission control parameters in all electrolyte delayed transmission control components for each liquid flow battery cell, and determines whether the electrolyte transmission difference of each liquid flow battery cell exceeds the first threshold based on all the transmission control parameters. If exceeded, the transmission control parameters in all electrolyte delayed transmission control components are adjusted.

[0034] Specifically, the electrical master control unit reads the total transmission control parameters K1, K2, ..., K of each flow battery unit. q ,K q It is the sum of the transmission control parameters in each electrolyte delayed transmission control component in the qth box. The energy storage system transmission balance index is calculated according to the total transmission control parameters of each liquid flow battery unit. The energy storage system transmission balance index is used to indicate the electrolyte transmission difference between each liquid flow battery unit.

[0035] The formula for the energy storage system transmission balance index is:

[0036]

[0037] In the formula, σ3 is the transmission balance index of the energy storage system, q is the number of flow battery units, i is the i-th container flow battery unit, K i is the transmission control parameter of the i-th container flow battery unit, is the average value of the transmission control parameters of each flow battery unit.

[0038] The electrical control unit determines whether σ3 is greater than or equal to the first threshold ε. If so, it is determined according to ΔK i The transmission control parameter K value of each flow battery unit is adjusted in order from large to small until the value of σ3 is less than ε. ΔK i The formula is:

[0039]

[0040] In the formula, K i is the transmission control parameter of the i-th container flow battery unit, is the average value of the transmission control parameters of each flow battery unit.

[0041] 102. When it is monitored that the thermal management difference of each liquid flow battery unit exceeds a second threshold, adjust the thermal management control parameters of each liquid flow battery unit.

[0042] The thermal management control parameters of the flow battery unit are the sum of the thermal management control parameters of each battery stack in the corresponding flow battery unit. The thermal management control parameters of the battery stack are the parameters of the corresponding thermal management control components.

[0043] In this step, the electrical master control unit reads the thermal management control parameters of each liquid flow battery unit, calculates the sum of the thermal management control parameters for each liquid flow battery unit, and obtains the total thermal management control parameters T1, T2, ..., T of the corresponding liquid flow battery unit. q , T q is the sum of the thermal management control parameters in box q. The total thermal management control parameter is used to calculate the thermal management balance index of the energy storage system, which is used to indicate the thermal management differences between the flow battery units.

[0044] The thermal management balance index formula of the energy storage system is:

[0045]

[0046] Where σ4 is the thermal management balance index of the energy storage system, q is the number of flow battery units, i is the i-th container flow battery unit, T i is the thermal management control parameter of the i-th container flow battery unit, is the average value of the thermal management control parameters of each flow battery unit.

[0047] The electrical master control unit determines whether σ4 is greater than or equal to the second threshold λ. If so, it is determined according to ΔT i The thermal management control parameter T value of each flow battery unit is adjusted in order from large to small until the σ4 value is less than ε.

[0048] ΔT i The formula is:

[0049]

[0050] Where, T i is the thermal management control parameter of the i-th container flow battery unit, is the average value of the thermal management control parameters of each flow battery unit.

[0051] 103. When it is monitored that the difference in the open circuit voltage (OCV) of each flow battery unit exceeds a third threshold, the transmission control parameter and the thermal management control parameter of each flow battery unit are adjusted.

[0052] In this step, the electrical master control unit reads the OCV value V1, V2, ..., Vq of each flow battery cell, and calculates the inter-box OCV difference ΔVmax according to each OCV value. The inter-box OCV difference is used to indicate the OCV difference between each flow battery cell.

[0053] The formula for ΔVmax is:

[0054] ΔVmax=|Vmax-Vmin|

[0055] Where Vmax is the maximum OCV voltage value in each flow battery cell, and Vmin is the minimum OCV voltage value in each flow battery cell.

[0056] The electrical control unit determines whether ΔVmax is greater than or equal to a third threshold value ψ. If so, the T value and K value of each flow battery unit are adjusted in order of OCV values ​​from large to small until ΔVmax is less than ψ. Each threshold in the embodiment of the present disclosure is determined according to the actual scenario.

[0057] In one feasible method, the specific method of balancing the OCV between each flow battery is as follows: the electrical master control unit reads the OCV of each flow battery cell, and obtains the OCV difference ΔVmax between boxes based on the difference between the maximum OCV and the minimum OCV in each OCV; determines whether the OCV difference between boxes exceeds a third threshold; if so, adjusts the transmission control parameters and thermal management control parameters of the corresponding flow battery cells in order from large to small according to each OCV, and reads the OCV of each flow battery cell, and calculates a new OCV difference between boxes, so that the new OCV difference between boxes does not exceed the third threshold; if not, reads the OCV of each flow battery cell to realize real-time monitoring of the OCV of each flow battery cell.

[0058] In the above embodiment, when adjusting the transmission control parameters or thermal management control parameters of the liquid flow battery unit, the electrical master control unit may send an adjustment instruction to the corresponding component of the liquid flow battery unit, and after receiving the adjustment instruction, the component adjusts the parameter according to the instruction.

[0059] It should be noted that there is no logical order for steps 101-103. In the method implemented in the present disclosure, first executing step 101 and then executing steps 102 and 103 is only one specific implementation method. No limitation on the order is made here.

[0060] The disclosed embodiment monitors whether the electrolyte transmission difference, thermal management difference, and OCV difference of each flow battery unit exceed the corresponding threshold value. If exceeded, the corresponding performance parameters are adjusted to reduce the electrolyte transmission delay difference, thermal management control difference, and OCV difference between each flow battery unit. By reducing the performance differences, the overall balance of each flow battery unit is ensured. The disclosed embodiment sets an electrical master control unit in the flow battery energy storage system, and uses the electrical master control unit to monitor and adjust the performance parameters of each flow battery unit to achieve balanced operation of each flow battery. The disclosed embodiment realizes the balance control of the flow battery energy storage system from the perspective of the balance process.

[0061] The disclosed embodiment can not only realize the balanced control between each liquid flow battery unit, but also realize the balanced control inside the liquid flow battery unit. Therefore, based on the above embodiment, the specific implementation steps of the balanced control inside the liquid flow battery unit are as follows: Figure 3 As shown, including:

[0062] 201. When it is monitored that the electrolyte transmission difference of each battery stack in the liquid flow battery unit exceeds a fourth threshold, adjust the transmission control parameters of each battery stack.

[0063] The transmission control parameter is a parameter of the electrolyte delay transmission control component. The electrolyte delay transmission control component is used to control the electrolyte transmission of each stack in the flow battery unit so that the electrolyte transmission of each stack tends to be consistent.

[0064] In one achievable method, the specific steps for balancing the electrolyte transmission of each stack within the flow battery unit are as follows:

[0065] Step 1: The electrical master control unit reads the transmission control parameters of each battery stack in the flow battery unit.

[0066] Step 2: The electrical master control unit calculates the transmission balance index of the flow battery unit using the transmission control parameters.

[0067] The formula for the transmission balance index of a flow battery unit is:

[0068]

[0069] In the formula, σ 1,x is the transmission balance index of the x-th container flow battery unit, K x,i is the electrolyte transmission control parameter of the i-th stack of the x-th container flow battery unit, is the average value of the electrolyte transmission control parameters of the xth container, K=F(α, β, γ), α is related to the flow rate, β is related to the set pipe length, γ is related to the set pipe diameter, and n is the total number of battery stacks.

[0070] Step 3: The electrical master control unit determines whether the transmission balance index of the flow battery unit exceeds a fourth threshold ξ.

[0071] In this step, it is determined whether the transmission balance index of the flow battery unit exceeds the fourth threshold value. If so, step 4 is executed; if not, step 5 is executed.

[0072] Step 4: The electrical master control unit calculates the transmission control deviation value ΔKx,i of each fuel cell stack, and adjusts the transmission control parameters of the corresponding fuel cell stack in descending order of the transmission control deviation value until the σ1 value is less than ξ.

[0073] The formula for ΔKx,i is:

[0074]

[0075] Where ΔKx,i is the transmission control deviation value of the i-th stack of the x-th container flow battery unit, K x,i is the electrolyte transmission control parameter of the i-th stack of the x-th container flow battery unit, is the average value of the electrolyte transmission control parameters of the xth container.

[0076] It should be noted that when the electrical master control unit sends a transmission control parameter instruction to each electrolyte delay transmission control component, the corresponding instructions can be sent in order from large to small according to each transmission control deviation value, or in other orders. Similarly, the electrical master control unit can also send control instructions to each capacity balancing control component and thermal management control component in other orders.

[0077] Step 5: The electrical master control unit reads the transmission control parameters of each battery stack.

[0078] In this step, when the electrical master control unit determines that σ1 is less than ξ, it indicates that the electrolyte transmission of each battery stack in the flow battery unit is in a consistent state, so only continuous monitoring is required, and no auxiliary regulation of the transmission control parameters is required.

[0079] 202. When it is monitored that the thermal management difference of each battery stack in the liquid flow battery unit exceeds a fifth threshold, adjust the thermal management control parameters of each battery stack.

[0080] Exemplarily, the electrical master control unit reads the thermal management control parameters T in each thermal management control component in the xth box of liquid flow battery cells. x，1 、T x，2 …T x，n , and calculate the thermal management balance index σ of the x-th box flow battery unit 2，x .

[0081] The thermal management balance index formula of a flow battery cell is:

[0082]

[0083] In the formula, σ 2，x is the thermal management balance index of the xth container flow battery unit, T x，i is the thermal management control parameter of the ith stack of the xth container flow battery unit, is the average value of the thermal management control parameters of the x-th container, T=F(a, b, c), a is related to the heater setting temperature, b is related to the insulation material parameters, c is related to the temperature set inside the box, and n is the total number of battery stacks.

[0084] Electric master control unit judgment σ 2，x Whether it exceeds the fifth threshold ζ, if it exceeds, the thermal management control parameters of the x-th container flow battery unit are adjusted in descending order according to the value of ΔTx,i until σ 2，x The value of is less than ζ.

[0085] ΔT x，i The formula is:

[0086]

[0087] Where, T x，i is the thermal management control parameter of the ith stack of the xth container flow battery unit, is the average value of the thermal management control parameters of the xth container.

[0088] 203. When it is monitored that the capacity difference of each battery stack in the liquid flow battery unit exceeds a sixth threshold, adjust the capacity management parameters of each battery stack.

[0089] In one achievable method, the specific steps for balancing the capacity of each battery stack within a flow battery unit are as follows:

[0090] Step 1: After the electrical master control unit monitors m charge and discharge cycles of the liquid flow battery unit, it reads the current charge cut-off voltage of each battery stack in the liquid flow battery unit.

[0091] Wherein, m is a positive integer.

[0092] Step 2: The electrical master control unit determines the minimum current charging medium voltage among the current charging cut-off voltages. If the difference between the preset charging cut-off voltage of the flow battery unit and the minimum current charging medium voltage exceeds a sixth threshold, the capacity management parameters of each battery stack are adjusted.

[0093] For example, the electrical control unit monitors the number of cycles of the xth box of liquid flow battery cells. When it is detected that the liquid flow battery cells have been cycled m times, the electrical control unit reads the current charging cut-off voltage V of each battery stack. x,1 、V x,2 …Vx,n , and calculate whether the difference ΔV between the preset charging cut-off voltage and the minimum current charging medium voltage is less than the sixth threshold δ.

[0094] The formula for ΔV is:

[0095] ΔV=V0-min[V x,1 ,V x,2 …V x,n ]

[0096] In the formula, V0 is the preset charging cut-off voltage, that is, the charging cut-off voltage preset by the flow battery energy storage system.

[0097] The electrical master control unit determines whether ΔV exceeds δ. If so, it sends a capacity management parameter adjustment instruction to each capacity balancing control component in turn. After receiving the corresponding instruction, each capacity balancing control component adjusts its own capacity management parameter C so that the actual charging cut-off voltage of each battery stack is equal to V0. Where: C = F (α1, α2), α1 is related to the liquid content of the positive electrode storage tank, and α2 is related to the liquid content of the negative electrode storage tank.

[0098] The operation control process for the balance within and between containers of the flow battery energy storage system of the disclosed embodiment is composed of two layers and three sub-control systems. The electrical master control unit not only assists in regulating the balance of various performances between containers, but also assists in regulating the balance of various performances within the box. That is, the disclosed embodiment improves the differences between the battery stack within the system box and the subsystems between boxes, further improves the system efficiency, achieves more efficient use of electrolyte, and extends the service life of the energy storage system.

[0099] According to the process of the above embodiment, a set of liquid flow battery energy storage system with parallel liquid circuits and series circuits was built and tested and verified. During the test, the system process, electrical and instrument parameters were analyzed and adjusted according to the actual operation of the supporting liquid flow battery unit. The system capacity parameters and system efficiency were normalized to 100% with the value when the system transmission control parameter difference was 0. Figure 4 It can be seen that the smaller the absolute value of the transmission control parameter difference is, the smaller the performance gap between the No. 1 liquid flow battery unit and the No. 2 liquid flow battery unit is; Figure 5 It can be seen that the smaller the absolute value of the transmission control parameter difference is, the higher the overall performance of the No. 1 liquid flow battery unit is.

[0100] Based on the above method, the embodiment of the present disclosure provides a liquid flow battery balancing control device, which is used to realize the operation control of the liquid flow battery balancing from the aspect of the balancing process. The embodiment of the device corresponds to the aforementioned method embodiment. For the convenience of reading, this embodiment will no longer repeat the details of the aforementioned method embodiment one by one, but it should be clear that the device in this embodiment can correspond to all the contents of the aforementioned method embodiment. Specifically, Figure 6 As shown, the device comprises:

[0101] A first adjustment unit 31, configured to adjust a transmission control parameter of each flow battery unit when it is detected that the electrolyte transmission difference of each flow battery unit exceeds a first threshold;

[0102] A second adjustment unit 32, configured to adjust the thermal management control parameters of each flow battery unit when it is monitored that the thermal management difference of each flow battery unit exceeds a second threshold;

[0103] The third adjustment unit 33 is used to adjust the transmission control parameters and thermal management control parameters of each liquid flow battery unit when it is monitored that the OCV difference of each liquid flow battery unit exceeds a third threshold.

[0104] Furthermore, the device also includes:

[0105] A fourth adjustment unit, configured to adjust a transmission control parameter of each battery stack when it is detected that a transmission difference of the electrolyte of each battery stack in the flow battery unit exceeds a fourth threshold;

[0106] a fifth adjustment unit, configured to adjust the thermal management control parameters of each battery stack when it is monitored that the thermal management difference of each battery stack in the flow battery unit exceeds a fifth threshold;

[0107] The sixth adjustment unit is used to adjust the capacity management parameters of each battery stack when it is monitored that the capacity difference of each battery stack in the liquid flow battery unit exceeds a sixth threshold.

[0108] Further, the fourth adjustment unit includes:

[0109] A first reading module is used to read the transmission control parameters of each battery stack in the flow battery unit;

[0110] A calculation module, used to calculate a transmission balance index of the flow battery unit using the transmission control parameter, wherein the transmission balance index is used to indicate the electrolyte transmission difference of each battery stack;

[0111] A judging module, configured to judge whether the transmission balance index exceeds a fourth threshold;

[0112] The adjustment module is used to calculate the transmission control deviation value of each battery stack when the judgment module judges that it is yes, and adjust the transmission control parameters of the corresponding battery stack in order from large to small according to the transmission control deviation values;

[0113] The second reading module is used to read the transmission control parameters of each battery stack when the judgment module determines that the transmission control parameters of each battery stack are negative.

[0114] Furthermore, the transmission balance index formula is:

[0115]

[0116] In the formula, σ 1,x is the transmission balance index of the x-th container flow battery unit, K x,i is the electrolyte transmission control parameter of the i-th stack of the x-th container flow battery unit, is the average value of the electrolyte transmission control parameters of the xth container, K=F(α, β, γ), α is related to the flow rate, β is related to the set pipe length, γ is related to the set pipe diameter, and n is the total number of battery stacks.

[0117] Further, the sixth adjustment unit includes:

[0118] A monitoring module, configured to read the current charging cut-off voltage of each battery stack in the liquid flow battery unit after monitoring m charge-discharge cycles of the liquid flow battery unit, where m is a positive integer;

[0119] A determination module is used to determine the minimum current charging medium voltage among the current charging cut-off voltages, and if the difference between the preset charging cut-off voltage of the liquid flow battery unit and the minimum current charging medium voltage exceeds a sixth threshold, the capacity management parameters of each battery stack are adjusted.

[0120] Further, the third adjustment unit includes:

[0121] A first reading module, used to read the OCV of each flow battery cell;

[0122] A calculation module, used for obtaining an inter-box OCV difference according to a difference between a maximum OCV and a minimum OCV among the OCVs, wherein the inter-box OCV difference is used for indicating an OCV difference between each flow battery unit;

[0123] A judging module, used to judge whether the OCV difference between the boxes exceeds a third threshold;

[0124] An adjustment module, configured to adjust the transmission control parameters and thermal management control parameters of the corresponding flow battery cells in order of the OCVs from large to small when the judgment module judges that the value is yes, and read the OCVs of the flow battery cells so that the new inter-box OCV difference does not exceed the third threshold value;

[0125] The second reading module is used to read the OCV of each flow battery cell if the judgment module determines that the OCV is yes.

[0126] Furthermore, the liquid flow battery unit includes: an electrolyte delayed transmission control component, a capacity balancing control component, and a thermal management control component. The electrolyte delayed transmission control component is used to control the transmission control parameters of the corresponding battery stack, the capacity balancing control component is used to control the capacity management parameters of the corresponding battery stack, and the thermal management control component is used to control the thermal management control parameters of the corresponding battery stack.

[0127] Furthermore, the embodiment of the present disclosure also provides a processor, the processor is used to run a program, wherein the program executes the above Figure 1-5 The method described in .

[0128] Furthermore, the embodiment of the present disclosure also provides a storage medium, wherein the storage medium is used to store a computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the above Figure 1-5 The method described in .

[0129] Furthermore, the present disclosure provides an electronic device 4, such as Figure 7 As shown, the device includes at least one processor 41, at least one memory 42 and a bus 43 connected to the processor 41; wherein the processor 41 and the memory 42 communicate with each other through the bus 43; the processor 41 is used to call the program instructions in the memory 42 to execute the above-mentioned liquid flow battery balancing control method. The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0130] Furthermore, the present disclosure also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that initializes the steps of the inspection method for network devices as described above.

[0131] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A flow battery balancing control method, characterized in that: The method comprises: When it is monitored that the electrolyte transmission difference of each flow battery unit exceeds a first threshold, adjusting the transmission control parameters of each flow battery unit; When it is monitored that the thermal management difference of each liquid flow battery unit exceeds a second threshold, adjusting the thermal management control parameters of each liquid flow battery unit; When it is monitored that the OCV difference of each flow battery unit exceeds a third threshold, the transmission control parameter and the thermal management control parameter of each flow battery unit are adjusted.

2. The method according to claim 1, characterized in that The method further comprises: When it is monitored that the electrolyte transmission difference of each battery stack in the liquid flow battery unit exceeds a fourth threshold, adjusting the transmission control parameters of each battery stack; When it is monitored that the thermal management difference of each battery stack in the flow battery unit exceeds a fifth threshold, adjusting the thermal management control parameters of each battery stack; When it is monitored that the capacity difference of each battery stack in the liquid flow battery unit exceeds a sixth threshold, the capacity management parameters of each battery stack are adjusted.

3. The method according to claim 2, characterized in that When it is monitored that the electrolyte transmission difference of each battery stack in the liquid flow battery unit exceeds a fourth threshold, adjusting the transmission control parameters of each battery stack includes: Read the transmission control parameters of each battery stack in the flow battery unit; Calculating a transmission balance index of the flow battery unit using the transmission control parameter, wherein the transmission balance index is used to indicate a difference in electrolyte transmission of each battery stack; Determining whether the transmission balance index exceeds a fourth threshold; If so, calculate the transmission control deviation value of each battery stack, and adjust the transmission control parameters of the corresponding battery stack in descending order according to the transmission control deviation value; If not, read the transmission control parameters of each battery stack.

4. The method according to claim 3, characterized in that The transmission balance index formula is: In the formula, σ 1,x is the transmission balance index of the x-th container flow battery unit, K x,i is the electrolyte transmission control parameter of the i-th stack of the x-th container flow battery unit, is the average value of the electrolyte transmission control parameter of the xth container, and n is the total number of battery stacks.

5. The method according to claim 2, characterized in that: When it is monitored that the capacity difference of each battery stack in the flow battery unit exceeds a sixth threshold, adjusting the capacity management parameters of each battery stack includes: After monitoring m charge-discharge cycles of the liquid flow battery unit, reading the current charge cut-off voltage of each battery stack in the liquid flow battery unit, where m is a positive integer; The minimum current charging medium voltage among the current charging cut-off voltages is determined, and if the difference between the preset charging cut-off voltage of the flow battery unit and the minimum current charging medium voltage exceeds a sixth threshold, the capacity management parameters of the battery stacks are adjusted.

6. The method according to claim 1, characterized in that When it is monitored that the OCV difference of each flow battery unit exceeds the third threshold, the transmission control parameters and thermal management control parameters of each flow battery unit are adjusted, including: Read the OCV of each flow battery cell; According to the difference between the maximum OCV and the minimum OCV among the OCVs, the inter-box OCV difference is obtained, and the inter-box OCV difference is used to indicate the OCV difference between the flow battery cells; Determining whether the inter-tank OCV difference exceeds a third threshold; If yes, then adjust the transmission control parameters and thermal management control parameters of the corresponding flow battery cells in order from large to small OCVs, and read the OCVs of the flow battery cells so that the new inter-box OCV difference does not exceed the third threshold; If not, read the OCV of each flow battery cell.

7. The method according to any one of claims 1 to 6, characterized in that: The liquid flow battery unit includes: an electrolyte delayed transmission control component, a capacity balancing control component, and a thermal management control component. The electrolyte delayed transmission control component is used to control the transmission control parameters of the corresponding battery stack, the capacity balancing control component is used to control the capacity management parameters of the corresponding battery stack, and the thermal management control component is used to control the thermal management control parameters of the corresponding battery stack.

8. A flow battery equalization control device, characterized in that: The device comprises: A first adjustment unit, configured to adjust a transmission control parameter of each flow battery unit when it is monitored that the electrolyte transmission difference of each flow battery unit exceeds a first threshold; A second adjustment unit, configured to adjust the thermal management control parameters of each liquid flow battery unit when it is monitored that the thermal management difference of each liquid flow battery unit exceeds a second threshold; The third adjustment unit is used to adjust the transmission control parameters and thermal management control parameters of each liquid flow battery unit when it is monitored that the OCV difference of each liquid flow battery unit exceeds a third threshold.

9. An electronic device, characterized in that: The device includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; and the processor is used to call program instructions in the memory to execute the method described in any one of claims 1-7.

10. A computer storage medium, characterized in that: The storage medium is used to store a computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

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