Method and device for controlling pressure balance of electrolysis galvanic pile, medium and electronic equipment

Abstract

The invention discloses a method and a device for controlling pressure balance of an electrolysis galvanic pile, a medium and electronic equipment. The method comprises the following steps: acquiring an anode outlet pressure value of the electrolytic galvanic pile, and acquiring a cathode outlet pressure value of the electrolytic galvanic pile; according to the anode outlet pressure value, determining a preset value of a cathode outlet pressure value; and controlling the opening degree of a pressure control valve based on the cathode outlet pressure value and the preset cathode outlet pressure value so as to realize the pressure balance of the electrolysis galvanic pile. According to the technical scheme, the effect of balancing the pressure of the electrolysis galvanic pile can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery pressure control, and in particular, relates to a method, device, medium and electronic equipment for controlling the pressure balance of an electrolytic cell stack. Background Art

[0002] With the rapid development of energy storage technology, flow battery technology is widely regarded as the most promising large-scale energy storage technology. Among them, iron-chromium redox flow battery is expected to be widely used in the field of energy storage technology due to its low cost and other advantages. At the end of charging, hydrogen will be released at the negative electrode of the iron-chromium flow battery. The release of hydrogen will cause the Fe in the positive and negative electrolytes of the system to 3+ and Cr 2+ Valence imbalance, after long-term operation, a large amount of Fe will accumulate in the positive electrode of the battery 3+ , causing the battery capacity to decay. In order to restore the capacity of the iron-chromium flow battery, the continuously accumulated Fe 3+ Reduction to Fe 2+ , the iron-chromium flow battery system will be equipped with a rebalancing system.

[0003] The electrolytic cell stack in the rebalancing system has an ion-conducting membrane that separates the cathode and anode, which cannot withstand the high pressure difference between the cathode and anode. In practical applications, the pressure difference between the cathode electrolyte and the anode electrolyte in the electrolytic cell stack is usually large due to differences in the operating parameters of the relevant equipment and the different layout of the equipment and pipelines, causing damage to the ion-conducting membrane. The present invention provides a flexible solution that can be applied to different scenarios. Therefore, in order to solve the above problems, the present application provides a method for controlling the pressure balance of the electrolytic cell stack. Summary of the invention

[0004] Embodiments of the present application provide a method, device, medium, and electronic device for controlling the pressure balance of an electrolytic cell stack, wherein the method can improve the effect of balancing the pressure of an electrolytic cell stack.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a method for controlling the pressure balance of an electrolytic stack is provided, characterized in that the method comprises: obtaining an anode outlet pressure value of the electrolytic stack, and obtaining a cathode outlet pressure value of the electrolytic stack; determining a preset value of the cathode outlet pressure value according to the anode outlet pressure value; and controlling the opening of a pressure control valve based on the cathode outlet pressure value and the preset value of the cathode outlet pressure value, thereby achieving pressure balance of the electrolytic stack.

[0007] In some embodiments of the present application, based on the aforementioned scheme, the opening of the pressure control valve is controlled based on the cathode outlet pressure value and the cathode outlet pressure value preset value, including: if the cathode outlet pressure value is greater than the cathode outlet pressure value preset value, increasing the opening of the pressure control valve so that the cathode outlet pressure value is equal to the cathode outlet pressure value preset value.

[0008] In some embodiments of the present application, based on the aforementioned scheme, the pressure control valve opening is controlled based on the cathode outlet pressure value and the cathode outlet pressure value preset value, including: if the cathode outlet pressure value is less than the cathode outlet pressure value preset value, reducing the pressure control valve opening so that the cathode outlet pressure value is equal to the cathode outlet pressure value preset value.

[0009] In some embodiments of the present application, based on the aforementioned scheme, determining the preset value of the cathode outlet pressure value includes: obtaining the anode liquid tank level value and the cathode liquid tank level value; obtaining the anode liquid tank height value and the cathode liquid tank height value; calculating the pressure difference according to the anode liquid tank level value, the cathode liquid tank level value, the anode liquid tank height value, and the cathode liquid tank height value; determining the preset value of the cathode outlet pressure value according to the pressure difference and the anode outlet pressure value.

[0010] In some embodiments of the present application, based on the aforementioned scheme, the calculation of the pressure difference includes: calculating the anode liquid tank potential energy according to the anode liquid tank level value and the anode liquid tank height value; calculating the positive electrode liquid tank potential energy according to the positive electrode liquid tank level value and the positive electrode liquid tank height value; calculating the pressure difference based on the anode liquid tank potential energy and the positive electrode liquid tank potential energy.

[0011] In some embodiments of the present application, based on the aforementioned scheme, the method further includes: if the pressure difference is greater than the maximum pressure difference, an abnormal alarm is issued to prevent the ion conductive membrane from rupturing and the pressure balance of the electrolytic stack from being destroyed.

[0012] In some embodiments of the present application, based on the aforementioned scheme, the maximum pressure difference is 10 kPa.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] This application analyzes the reasons that affect the pressure balance of the electrolytic stack in the battery rebalancing system, and adds a pressure control valve to the pipeline at the cathode outlet of the electrolytic stack. By obtaining the anode outlet pressure value of the electrolytic stack and the cathode outlet pressure value of the electrolytic stack, the cathode outlet pressure value preset value is determined. Among them, the cathode outlet pressure value preset value is determined by the pressure difference between the anode outlet pressure value and the cathode outlet pressure value.

[0015] Then, after determining the preset value of the cathode outlet pressure value, the opening of the pressure control valve is controlled based on the cathode outlet pressure value and the preset value of the cathode outlet pressure value, thereby achieving pressure balance of the electrolytic cell stack.

[0016] Specifically, if the cathode outlet pressure value is greater than the cathode outlet pressure value preset value, the pressure control valve opening is increased so that the cathode outlet pressure value is equal to the cathode outlet pressure value preset value. Conversely, if the cathode outlet pressure value is less than the cathode outlet pressure value preset value, the pressure control valve opening is reduced so that the cathode outlet pressure value is equal to the cathode outlet pressure value preset value.

[0017] Based on the above method, the method for controlling the pressure balance of the electrolytic cell stack provided by the present invention can improve the effect of balancing the pressure of the electrolytic cell stack.

[0018] According to the second aspect of an embodiment of the present application, a device for controlling the pressure balance of an electrolytic stack is provided, characterized in that the device comprises: an acquisition unit for acquiring an anode outlet pressure value of the electrolytic stack and acquiring a cathode outlet pressure value of the electrolytic stack; a determination unit for determining a preset value of the cathode outlet pressure value based on the anode outlet pressure value; and a control unit for controlling the opening of a pressure control valve based on the cathode outlet pressure value and the preset value of the cathode outlet pressure value, thereby achieving pressure balance of the electrolytic stack.

[0019] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, characterized in that at least one program code is stored in the computer-readable storage medium, and the at least one program code is loaded and executed by a processor to implement the operations performed by the described method.

[0020] According to a fourth aspect of an embodiment of the present application, an electronic device is provided, characterized in that the electronic device includes one or more processors and one or more memories, at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method.

[0021] The beneficial effects of each embodiment of the second to fourth aspects mentioned above can refer to the beneficial effects of the first aspect and each embodiment of the first aspect mentioned above, and will not be repeated here.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 A flow chart showing a method for controlling pressure balance of an electrolytic cell stack in an embodiment of the present application is shown;

[0025] Figure 2 A schematic diagram of the structure of the iron-chromium liquid flow battery rebalancing system in an embodiment of the present application is shown;

[0026] Figure 3 A schematic diagram of the structure of a device for balancing the pressure of an electrolytic cell stack in an embodiment of the present application is shown;

[0027] Figure 4 A schematic diagram of the structure of an electronic device in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0032] The following is a detailed description of this application:

[0033] Figure 1 The flowchart of the method for controlling the pressure balance of the electrolytic stack in the embodiment of the present application is shown. The method for controlling the pressure balance of the electrolytic stack can be executed by a device with a computing and processing function, such as a device for controlling the pressure balance of the electrolytic stack. Figure 1 As shown, the method for controlling the pressure balance of the electrolytic stack includes at least steps 110 to 130, which are described in detail as follows:

[0034] Step 110, obtaining the anode outlet pressure value of the electrolytic cell stack, and obtaining the cathode outlet pressure value of the electrolytic cell stack.

[0035] Step 120: Determine a preset cathode outlet pressure value according to the anode outlet pressure value.

[0036] Step 130, based on the cathode outlet pressure value and the cathode outlet pressure preset value, control the opening of the pressure control valve to achieve pressure balance of the electrolytic cell stack.

[0037] In this application, reference is made to Figure 2 , shows a schematic diagram of the structure of the iron-chromium liquid flow battery rebalancing system in an embodiment of the present application. Figure 2 In the process, the rebalancing system is operated intermittently at regular intervals, and electric switch valves are respectively set at the outlets of the cathode liquid tank and the anode liquid tank. When a signal is received that the capacity of the main battery stack has decayed to a certain extent, the above-mentioned electric switch valve is opened, and the cathode pump and anode pump are started. When the capacity of the main battery stack is restored, the above-mentioned electric switch valve and the cathode and anode pumps are closed, and the rebalancing system is stopped.

[0038] The cathode electrolyte is stored in the cathode liquid tank. The cathode electrolyte is pumped out by the cathode pump, pressurized, and transported to the cathode of the electrolytic cell. The cathode pump is a variable frequency magnetic pump. A flow transmitter is provided on the cathode pump outlet pipe. The frequency converter of the cathode pump is controlled by the flow transmitter to adjust the flow of the cathode electrolyte. After the DC power supply is turned on, the cathode electrolyte reacts at the cathode of the electrolytic cell: Fe 3+ +e - →Fe 2+ After the reaction is completed, the positive electrode electrolyte returns to the positive electrode liquid tank through the pipeline from the cathode outlet of the electrolytic cell.

[0039] The anode electrolyte is stored in the anode liquid tank. The anode electrolyte is pumped out by the anode pump, pressurized, and transported to the anode of the electrolytic cell stack. The anode pump is a variable frequency magnetic pump. A flow transmitter is installed on the outlet pipe of the anode pump. The frequency converter motor of the anode pump is controlled by the flow transmitter to adjust the flow of the anode electrolyte. After the DC power supply is turned on, the anode electrolyte reacts at the anode of the electrolytic cell stack: 2Cl - →Cl 2 +2e - After the reaction is completed, the anolyte is returned from the anode outlet of the electrolytic cell stack to the anolyte tank through the pipeline.

[0040] In the existing iron-chromium liquid flow battery rebalancing system, since the cathode outlet pressure value and the anode outlet pressure value of the electrolytic cell stack are not controlled during the process of the positive electrode electrolyte and the anode electrolyte returning to the positive electrode liquid tank and the anode liquid tank respectively, some abnormal conditions may cause the pressure difference in the electrolytic cell stack to be too large, causing damage to the ion conduction membrane, thereby affecting the stability of the rebalancing system and the pressure balance effect.

[0041] At the same time, in the existing iron-chromium liquid flow battery rebalancing system, due to the size problem of the cathode liquid tank, there is a certain height difference between the cathode liquid tank and the anode liquid tank, as well as a certain liquid level difference. This will cause the pressure difference in the electrolytic cell stack to be too large during the process of the cathode electrolyte and the anode electrolyte returning to the cathode liquid tank and the anode liquid tank respectively, causing damage to the ion conduction membrane, thereby affecting the stability of the rebalancing system and the pressure balance effect.

[0042] Taking the above two reasons into consideration, a pressure control valve is added in the pipeline where the positive electrode electrolyte returns to the positive electrode liquid tank to control the cathode outlet pressure of the electrolytic cell stack, thereby ensuring the pressure balance inside the electrolytic cell stack.

[0043] Specifically, pressure measurement points are set on the pipeline for returning the cathode electrolyte to the cathode liquid tank and the pipeline for returning the anode electrolyte to the anode liquid tank, respectively. Then, the anode outlet pressure value of the electrolytic cell stack and the cathode outlet pressure value of the electrolytic cell stack are obtained through the established pressure measurement points.

[0044] According to the obtained anode outlet pressure value, the preset value of the cathode outlet pressure value of the electrolytic stack can be determined. The preset value of the cathode outlet pressure value can be determined according to the following steps: obtaining the anode liquid tank level value and the cathode liquid tank level value; obtaining the anode liquid tank height value and the cathode liquid tank height value; calculating the pressure difference according to the anode liquid tank level value, the cathode liquid tank level value, the anode liquid tank height value, and the cathode liquid tank height value; determining the preset value of the cathode outlet pressure value according to the pressure difference and the anode outlet pressure value.

[0045] Furthermore, in the process of calculating the pressure difference, the following steps may be included: calculating the anode liquid tank potential energy according to the anode liquid tank level value and the anode liquid tank height value; calculating the positive electrode liquid tank potential energy according to the positive electrode liquid tank level value and the positive electrode liquid tank height value; calculating the pressure difference based on the anode liquid tank potential energy and the positive electrode liquid tank potential energy.

[0046] After obtaining the preset value of the cathode outlet pressure value, the opening of the pressure control valve can be controlled to achieve the control of the cathode outlet pressure value of the electrolytic stack. If the cathode outlet pressure value is greater than the preset value of the cathode outlet pressure value, the opening of the pressure control valve is increased so that the cathode outlet pressure value is equal to the preset value of the cathode outlet pressure value. Conversely, if the cathode outlet pressure value is less than the preset value of the cathode outlet pressure value, the opening of the pressure control valve is reduced so that the cathode outlet pressure value is equal to the preset value of the cathode outlet pressure value.

[0047] In addition, during the operation of the iron-chromium liquid flow battery rebalancing system, the pressure in the electrolytic stack can be detected in real time. If the pressure difference is greater than the maximum pressure difference, an abnormal alarm is issued to prevent the ion conduction membrane from rupturing and the pressure balance of the electrolytic stack from being destroyed. The maximum pressure difference is 10 kPa.

[0048] Based on the same inventive concept, the present application also provides a device for controlling the pressure balance of an electrolytic cell stack, referring to Figure 3 , showing a schematic diagram of the structure of the device for controlling the pressure balance of the electrolytic stack in the embodiment of the present application. The device 300 for controlling the pressure balance of the electrolytic stack includes: an acquisition unit 301, used to acquire the anode outlet pressure value of the electrolytic stack, and to acquire the cathode outlet pressure value of the electrolytic stack; a determination unit 302, used to determine the cathode outlet pressure value preset value according to the anode outlet pressure value; a control unit 303, used to control the opening of the pressure control valve based on the cathode outlet pressure value and the cathode outlet pressure value preset value, so as to achieve the pressure balance of the electrolytic stack.

[0049] For details not disclosed in the embodiments of the device of the present application, please refer to the embodiments of the above method of the present application.

[0050] Based on the same inventive concept, the present application may also provide a computer-readable storage medium, characterized in that at least one program code is stored in the computer-readable storage medium, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method described.

[0051] Based on the same inventive concept, the present application also provides an electronic device, referring to Figure 4 , Figure 4A schematic diagram of the structure of an electronic device in an embodiment of the present application is shown.

[0052] The electronic device includes one or more memories 404, one or more processors 402, and at least one computer program (program code) stored in the memory 404 and executable on the processor 402. When the processor 402 executes the computer program, the method described above is implemented.

[0053] Among them, Figure 4 In the embodiment of the present invention, a bus architecture (represented by bus 400) is shown, which may include any number of interconnected buses and bridges, and bus 400 links various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 may be used to store data used by processor 402 when performing operations.

[0054] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0055] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0056] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0057] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program code.

[0058] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for controlling the pressure balance of an electrolytic cell stack, characterized in that: The method comprises: Obtaining an anode outlet pressure value of an electrolytic cell stack, and obtaining a cathode outlet pressure value of an electrolytic cell stack; Determining a preset value of a cathode outlet pressure value according to the anode outlet pressure value; Based on the cathode outlet pressure value and the cathode outlet pressure preset value, the opening of the pressure control valve is controlled to achieve pressure balance of the electrolytic cell stack.

2. The method according to claim 1, characterized in that: The controlling the opening of the pressure control valve based on the cathode outlet pressure value and the cathode outlet pressure preset value comprises: If the cathode outlet pressure value is greater than the cathode outlet pressure preset value, the pressure control valve opening is increased so that the cathode outlet pressure value is equal to the cathode outlet pressure preset value.

3. The method according to claim 1, characterized in that The controlling the opening of the pressure control valve based on the cathode outlet pressure value and the cathode outlet pressure preset value comprises: If the cathode outlet pressure value is less than the cathode outlet pressure preset value, the pressure control valve opening is reduced so that the cathode outlet pressure value is equal to the cathode outlet pressure preset value.

4. The method according to claim 1, characterized in that: The step of determining a preset cathode outlet pressure value comprises: Obtain the liquid level value of the anode liquid tank and the liquid level value of the cathode liquid tank; Get the height value of the anode liquid tank and the cathode liquid tank; Calculating a pressure difference according to the anode liquid tank level value, the cathode liquid tank level value, the anode liquid tank height value, and the cathode liquid tank height value; A preset cathode outlet pressure value is determined according to the pressure difference and the anode outlet pressure value.

5. The method according to claim 4, characterized in that The calculating of the pressure difference comprises: Calculating the potential energy of the anode liquid tank according to the anode liquid tank liquid level value and the anode liquid tank height value; Calculating the potential energy of the cathode liquid tank according to the cathode liquid tank level value and the cathode liquid tank height value; The pressure difference is calculated based on the anolyte tank potential and the catholyte tank potential.

6. The method according to claim 4, characterized in that The method further comprises: If the pressure difference is greater than the maximum pressure difference, an abnormal alarm is issued to prevent the ion conductive membrane from rupturing and the pressure balance of the electrolytic stack from being destroyed.

7. The method according to claim 6, characterized in that The maximum pressure difference is 10 kPa.

8. A device for controlling the pressure balance of an electrolytic cell stack, characterized in that: The device comprises: An acquisition unit, used to acquire an anode outlet pressure value of an electrolytic cell stack, and to acquire a cathode outlet pressure value of an electrolytic cell stack; A determination unit, configured to determine a preset cathode outlet pressure value according to the anode outlet pressure value; The control unit is used to control the opening of the pressure control valve based on the cathode outlet pressure value and the cathode outlet pressure preset value, so as to achieve pressure balance of the electrolytic cell stack.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 7.

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