Electric pile fault on-line monitoring method and equipment based on flow battery and medium

Abstract

The invention discloses an electric pile fault online monitoring method and device based on a redox flow battery and a medium, and the method comprises the steps: constructing a voltage operation curve of the redox flow battery in a charging and discharging operation process, and comparing the voltage operation curve with a voltage standard working curve of the redox flow battery; and according to the voltage change value, the coulombic efficiency and the voltage efficiency of the charge and discharge test, or the voltage change value, the coulombic efficiency, the activation overpotential of the current interruption test and the ohmic overpotential caused by the ohmic loss, identifying whether the galvanic pile component of the flow battery has a fault. Ohmic overpotential caused by voltage change, coulombic efficiency, activation overpotential and ohmic loss in the charge-discharge process of the flow battery is associated with a galvanic pile component, so that the performance of the flow battery can be effectively monitored, galvanic pile faults can be quickly monitored, and the reliability and the operation efficiency of the battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of liquid flow batteries, and in particular to a method, device and medium for online monitoring of a stack failure based on a liquid flow battery. Background Art

[0002] Liquid flow batteries work differently from conventional batteries. Their active materials are not stored inside the battery, but in a storage tank outside the battery. The stack structure of a liquid flow battery is composed of end plates, current collectors, bipolar plates, electrodes, membranes, electrodes, bipolar plates, current collectors, and end plates from the outside to the inside. Liquid flow battery stacks have many components, which brings certain difficulties to the online fault monitoring of liquid flow battery stacks.

[0003] At present, battery fault monitoring technologies are mainly focused on lithium batteries and other batteries. Although these technologies have achieved certain results in lithium battery fault monitoring, they are not suitable for flow batteries. The working principle and structure of flow batteries are significantly different from traditional lithium batteries. Therefore, online fault monitoring technology for flow battery stacks is needed.

[0004] However, there is currently a lack of relevant technologies for online fault monitoring of flow battery stacks, which limits the performance and reliability of flow batteries in practical applications. Summary of the invention

[0005] The embodiments of the present application provide a method, device and medium for online monitoring of a flow battery stack failure, which are used to solve the problem that a flow battery stack failure cannot be monitored online.

[0006] The present application embodiment adopts the following technical solutions:

[0007] On the one hand, an embodiment of the present application provides an online monitoring method for a flow battery stack fault, the method comprising: constructing a voltage operating curve of the flow battery during the charge and discharge operation, and comparing the voltage operating curve with the voltage standard working curve of the flow battery; identifying whether a fault occurs in the stack components of the flow battery based on the voltage change value, the coulombic efficiency and voltage efficiency of the charge and discharge test, or the voltage change value, coulombic efficiency, activation overpotential of the current interruption test, and the ohmic overpotential caused by ohmic loss.

[0008] In one example, whether a fault occurs in a stack component of a flow battery is identified based on the voltage change value, the coulomb efficiency and the voltage efficiency of the charge and discharge test, specifically including: when determining that the charging voltage is momentarily reduced or the discharge voltage is momentarily increased based on the voltage change value, comparing the coulomb efficiency with the coulomb standard value, and comparing the voltage efficiency with the voltage efficiency standard value; based on the comparison result, determining whether the diaphragm of the flow battery is faulty.

[0009] In one example, determining whether the diaphragm of the flow battery has a fault based on the comparison result specifically includes: if the coulomb efficiency is lower than the coulomb standard value and the voltage efficiency is higher than the voltage efficiency standard value, determining that the diaphragm of the flow battery has small hole damage.

[0010] In one example, whether a stack component of a liquid flow battery is faulty is identified based on the voltage change value, coulomb efficiency, activation overpotential of a current interruption test, and ohmic overpotential caused by ohmic loss, specifically including: obtaining a standard activation overpotential value and a standard ohmic overpotential value based on the current interruption voltage standard working curve of the liquid flow battery; when determining an instantaneous increase in charging voltage or an instantaneous decrease in discharge voltage based on the voltage change value, obtaining an activation overpotential of a current interruption test and an ohmic overpotential caused by ohmic loss by performing a current interruption test on the liquid flow battery; comparing the activation overpotential with the standard activation overpotential value, and comparing the ohmic overpotential with the standard ohmic overpotential value; determining whether a stack component of the liquid flow battery is faulty based on the potential comparison result and the coulomb efficiency.

[0011] In one example, the method of determining whether a flow battery stack component is faulty based on the potential comparison result and the coulomb efficiency specifically includes: when the coulomb efficiency is lower than the coulomb standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, determining that the flow battery diaphragm is aged.

[0012] In one example, the method further includes: determining that a fault occurs in an electrode of the flow battery when the activation overpotential increases and the ohmic overpotential remains unchanged or increases.

[0013] In one example, the determination of whether a stack component of a flow battery is faulty is made based on the potential comparison result and the coulomb efficiency, specifically including: when the coulomb efficiency is equal to the coulomb standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, it is determined that a bipolar plate of the flow battery is faulty; the fault types include corrosion and aging.

[0014] In one example, the method further includes: determining that a fault occurs in an electrode of the flow battery when the activation overpotential increases and the ohmic overpotential remains unchanged or increases.

[0015] On the other hand, an embodiment of the present application provides an online monitoring device for a battery stack fault based on a liquid flow battery, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute any one of the above-mentioned methods for online monitoring of a battery stack fault based on a liquid flow battery.

[0016] On the other hand, an embodiment of the present application provides a non-volatile computer storage medium for online monitoring of battery stack faults based on a liquid flow battery, which stores computer executable instructions, and the computer executable instructions can execute any of the above-mentioned methods for online monitoring of battery stack faults based on a liquid flow battery.

[0017] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0018] The present application links the voltage change, coulomb efficiency, and voltage efficiency of the liquid flow battery during the charge and discharge process with the battery stack components, or links the voltage change, coulomb efficiency, activation overpotential obtained from the current interruption test, and ohmic overpotential caused by ohmic loss of the liquid flow battery during the charge and discharge process with the battery stack components. It can accurately determine the fault point of the battery stack component without the need to add other related monitoring equipment. The operation is simple and convenient, and the maintenance cost is reduced. It can effectively monitor the performance of the liquid flow battery, quickly monitor the battery stack failure, and improve the reliability and operating efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of a flow chart of an online monitoring method for a stack failure based on a flow battery provided in an embodiment of the present application;

[0021] Figure 2 A flow chart of an online fault monitoring technology for a flow battery provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of an online monitoring device for stack failure based on a flow battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. 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 the field without creative work are within the scope of protection of the present application.

[0024] Some embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] Figure 1A schematic diagram of a flow chart of an online monitoring method for a flow battery stack fault provided in an embodiment of the present application. The method can be applied to different business fields. Certain input parameters or intermediate results in the process allow manual intervention and adjustment to help improve accuracy.

[0026] The analysis method involved in the embodiments of the present application can be implemented by a terminal device or a server, and the present application does not impose any special restrictions on this. For the convenience of understanding and description, the following embodiments are described in detail by taking a server as an example.

[0027] Figure 1 The process in may include the following steps:

[0028] S101: constructing a voltage operation curve of the liquid flow battery during the charge and discharge operation process, and comparing the voltage operation curve with the voltage standard working curve of the liquid flow battery.

[0029] It should be noted that the active materials of flow batteries and ordinary batteries are contained in solid electrodes. Different positive and negative active materials are mainly present in electrolytes, which are respectively stored in two liquid storage tanks. When working, they are circulated through the battery by a liquid pump. The positive and negative electrolytes in the battery are separated by an ion exchange membrane. When the flow battery is working, hydrogen ions migrate in the electrolyte that separates the two half reactions, and electrons flow in a directed manner through the external circuit to do work, forming a total electrical circuit.

[0030] In some embodiments of the present application, before constructing the voltage operating curve of the flow battery during the charge and discharge operation, it is necessary to obtain the voltage standard operating curve of the flow battery, and the process is as follows:

[0031] The voltage standard working curve of the flow battery is extracted from the standard working curve library of the flow battery. It should be noted that the standard working curve library of the flow battery includes voltage standard working curves under different working conditions. That is, the voltage standard working curve with the same working condition as the flow battery is extracted.

[0032] It should be noted that the standard working curves of liquid flow battery voltage under different working conditions include the standard working curves of liquid flow battery voltage under different operating temperatures, different current densities, and different electrolyte concentrations. Because the performance of liquid flow batteries will change with the changes in these operating conditions, the standard working curves under different working conditions will be different. For example: the operating temperature is 25°C, the current density is 10mA / cm 2 , the electrolyte concentration is 1M and the operating temperature is 30°C, the current density is 10mA / cm 2 Under the two working conditions with the electrolyte concentration of 1M, the standard working curve of the flow battery voltage obtained will be different due to the influence of temperature conditions.

[0033] In addition, the process of constructing the voltage operation curve of the flow battery during the charge and discharge operation is as follows:

[0034] During the charge and discharge test of the flow battery, the voltage change is monitored online in real time, and the voltage data is converted into points in the coordinate system to construct a voltage operation curve. The coordinate axes of the coordinate system are voltage data and time points.

[0035] S102: Identify whether a flow battery stack component is faulty based on the voltage change value, the coulombic efficiency and voltage efficiency of the charge and discharge test, or the voltage change value, coulombic efficiency, activation overpotential of the current interruption test, and ohmic overpotential caused by ohmic loss.

[0036] It should be noted that coulombic efficiency refers to the ratio of the actual amount of electricity discharged by the battery to the theoretical discharge capacity, while voltage efficiency refers to the ratio of the battery output voltage to the input voltage. The coulombic efficiency and voltage efficiency of each battery are different and are standard values ​​when the battery leaves the factory.

[0037] In some embodiments of the present application, it is necessary to obtain the current interruption voltage standard working curve of the flow battery, and the process is as follows:

[0038] From the standard working curve library of liquid flow batteries, extract the current interruption voltage standard working curve with the same working condition as the liquid flow battery.

[0039] In addition, it is necessary to construct the voltage operation working curve for the current interruption test. The process is as follows:

[0040] When conducting a current interruption test on a flow battery, the voltage change is monitored online in real time, the voltage data is converted into points in a coordinate system, and a current interruption voltage operation curve is constructed.

[0041] It should be noted that in the current interruption voltage operation curve, the sudden voltage increase during the current interruption time is the ohmic overpotential caused by ohmic loss, and the voltage increase during the slow increase to stability after a sudden increase is the activation overpotential.

[0042] In summary, by monitoring and analyzing the working voltage of the flow battery during the charge and discharge test and the working voltage of the current interruption test, online fault monitoring and diagnosis of the flow battery stack can be achieved without adding additional monitoring equipment. This helps to timely discover and solve battery faults, improve battery reliability and operating efficiency, and reduce maintenance costs.

[0043] In some embodiments of the present application, since the positive and negative electrodes of the flow battery are separated by a diaphragm, if the diaphragm is aged, the coulombic efficiency of the flow battery will inevitably decrease; in addition, the flow battery electrode is a porous material, as the site of electrochemical reaction, if there is a problem with the electrode, it will inevitably affect the electrode activity, thereby increasing the activation overpotential in the reaction; in addition, the bipolar plate of the flow battery is used as a current collecting plate, and if it ages, it will cause the ohmic internal resistance of the battery to increase. Based on this, according to the voltage change value, the coulombic efficiency and voltage efficiency of the charge and discharge test, the process of identifying whether the stack components of the flow battery are faulty is as follows:

[0044] When the instantaneous decrease in charging voltage or the instantaneous increase in discharging voltage is determined based on the voltage change value, the coulomb efficiency is compared with the coulomb standard value, and the voltage efficiency is compared with the voltage efficiency standard value.

[0045] If the coulombic efficiency is lower than the coulombic standard value and the voltage efficiency is higher than the voltage efficiency standard value, it is determined that the diaphragm of the flow battery has small pore damage.

[0046] It should be noted that when the voltage change value at the same time point is a voltage increase value higher than the preset increase threshold, it is determined to be an instantaneous increase. When the voltage change value at the same time point is a voltage decrease value higher than the preset decrease threshold, it is determined to be an instantaneous decrease. For example, the preset increase threshold and the preset decrease threshold are both 0.05V.

[0047] It should also be noted that the positive and negative electrodes of the flow battery are separated by a diaphragm, which prevents the positive and negative electrodes from directly contacting and short-circuiting, while allowing ions to pass through to complete the electrochemical reaction inside the battery. During normal charging and discharging, the diaphragm should not have any damage or defects. When small holes appear in the diaphragm, during charging, the oxygen generated by the positive electrode may pass through the small holes to the negative electrode and react with the hydrogen on the negative electrode. This reaction consumes electrical energy and generates heat, causing the charging voltage to suddenly decrease. During the discharge process, the hydrogen generated by the negative electrode may pass through the small holes to the positive electrode and react with the oxygen on the positive electrode. This also consumes electrical energy and generates heat, causing the discharge voltage to suddenly increase.

[0048] Furthermore, the battery charge and discharge efficiency can be used to confirm whether the diaphragm has small holes. Because, when the coulomb efficiency is lower than the coulomb standard value, that is, the ratio of the actual amount of electricity discharged by the battery to the theoretical discharge capacity decreases, and the theoretical discharge capacity remains unchanged, it means that the actual amount of electricity released decreases. Based on the above description, when small holes appear in the diaphragm, the reaction between oxygen and hydrogen will consume electrical energy, which will cause the actual amount of electricity released to decrease. In addition, when the voltage efficiency is higher than the standard value, that is, the ratio of the battery output voltage to the input voltage becomes larger, and the positive and negative ions react more directly than in the standard state. Based on the above description, when small holes appear in the diaphragm, the oxygen generated by the positive electrode reaches the negative electrode through the small holes or the hydrogen generated by the negative electrode reaches the positive electrode through the small holes, that is, oxygen and hydrogen are more likely to contact and react when the diaphragm is damaged, which will cause the ratio of the battery output voltage to the input voltage to become larger and the positive and negative ions to react more directly than in the standard state.

[0049] In some embodiments of the present application, the process of identifying whether a stack component of a flow battery is faulty is as follows based on the voltage change value, coulomb efficiency, activation overpotential of a current interruption test, and ohmic overpotential caused by ohmic loss:

[0050] When the instantaneous increase in charging voltage or the instantaneous decrease in discharging voltage is determined based on the voltage change value, a current interruption test is performed on the liquid flow battery to obtain the activation overpotential of the current interruption test and the ohmic overpotential caused by ohmic loss; the activation overpotential is compared with the activation overpotential standard value, and the ohmic overpotential is compared with the ohmic overpotential standard value.

[0051] Specifically, when the coulombic efficiency is lower than the coulombic standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, it is determined that the diaphragm of the flow battery has aged.

[0052] It should be noted that when the diaphragm ages, the conductivity of the diaphragm will decrease, resulting in an increase in the resistance inside the battery, and then when the current passes through, the ohmic loss will also increase, resulting in an increase in the ohmic overpotential. However, there are still other reasons for the increase in ohmic overpotential. Therefore, it is necessary to verify whether the increase in ohmic overpotential is caused by diaphragm aging. The verification principle is as follows:

[0053] Because when the coulomb efficiency is lower than the coulomb standard value, the actual discharge amount of the battery is reduced, and then it can be inferred that the resistance increases or the electrode fails, that is, the diaphragm ages or the electrode fails. In addition, when the activation overpotential remains unchanged and the ohmic overpotential increases, it means that the electrochemical reaction in the battery is not affected, so the electrode failure can be ruled out. Therefore, when the coulomb efficiency is lower than the coulomb standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, the increase in the ohmic overpotential is caused by the aging of the diaphragm.

[0054] It should be noted that the activation overpotential is the voltage drop caused by the activation energy barrier of the electrochemical reaction. The aging of the diaphragm mainly affects the ion transport and the internal resistance of the battery, rather than directly affecting the activation process of the electrochemical reaction. Therefore, when the diaphragm ages, the activation overpotential will not change.

[0055] Specifically, when the coulombic efficiency is lower than the coulombic standard value, or when the coulombic efficiency is equal to the coulombic standard value, when the activation overpotential increases, and the ohmic overpotential remains unchanged or increases, it is determined that the electrode of the flow battery is faulty.

[0056] It should be noted that when an electrode fails, the following situations may occur: 1. The active material on the electrode surface falls off or changes in structure, which increases the resistance of the electrode and causes the ohmic overpotential to increase. 2. The conductivity inside the electrode deteriorates. For example, the pore structure inside the electrode is blocked or the conductivity of the electrode material decreases. This also increases the resistance and causes the ohmic overpotential to increase. 3. An impedance layer is formed on the electrode surface. For example, a layer of oxide or other impedance material may form on the electrode surface, which increases the resistance and causes the ohmic overpotential to increase.

[0057] However, in some cases, if the electrode fault mainly affects the activity of the electrode rather than its conductivity, the ohmic losses will not increase and the ohmic overpotential will remain unchanged.

[0058] When an electrode fails, the following situations may also occur: 1. Reduction of active substances on the electrode surface: This will reduce the reaction activity of the electrode, thereby increasing the activation energy barrier of the reaction and causing the activation overpotential to increase. 2. Changes in the electrode surface structure. For example, changes in the microstructure of the electrode surface cause the diffusion paths of reactants and products to become longer or more complex, thereby increasing the activation energy barrier and causing the activation overpotential to increase. 3. The formation of an impedance layer on the electrode surface. For example, oxides or other impedance substances formed on the electrode surface will increase the activation energy barrier of the reaction and cause the activation overpotential to increase.

[0059] It should be noted that when an electrode fails, it will not significantly affect the charge transfer process of the battery, so the Coulombic efficiency can remain normal.

[0060] Therefore, through the above phenomenon, it is determined that the electrode of the flow battery is faulty.

[0061] Specifically, when the coulomb efficiency is equal to the coulomb standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, it is determined that the bipolar plate of the flow battery is faulty; the fault types include corrosion and aging.

[0062] It should be noted that the bipolar plate, as a current collecting plate, is responsible for collecting and conducting current. If the bipolar plate fails, such as aging or damage (for example, corrosion), the ohmic internal resistance inside the battery will increase. The increase in ohmic internal resistance will cause a greater voltage drop when current passes through, that is, the ohmic loss increases, thereby increasing the ohmic overpotential caused by the ohmic loss. However, the failure of the bipolar plate mainly affects the current conduction, and does not directly affect the electrochemical reaction process on the electrode. Therefore, the activation overpotential remains unchanged. In addition, when the bipolar plate fails, it will not directly affect the chemical reaction process of the electrode, so the coulomb efficiency can remain normal. Therefore, the coulomb efficiency and the coulomb standard value need to be equal.

[0063] In some embodiments of the present application, after comparing the voltage operating curve with the voltage standard operating curve of the liquid flow battery, a charge and discharge test is continued to verify the error of the first charge and discharge test. When there is no error, the first charge and discharge test is used as the charge and discharge test process in the above-mentioned S101 process. When there is an error, the charge and discharge test is repeated in a cycle.

[0064] It should be noted that although the embodiments of the present application are based on Figure 1 Steps S101 to S102 are described in sequence, but this does not mean that steps S101 and S102 must be performed in a strict order. Figure 1 The order shown in the figure is to introduce and explain step S101 to step S102 in sequence, in order to facilitate those skilled in the art to understand the technical solution of the embodiment of the present application. In other words, in the embodiment of the present application, the order between step S101 and step S102 can be appropriately adjusted according to actual needs.

[0065] pass Figure 1 By using the method, the voltage change, coulomb efficiency and voltage efficiency of the liquid flow battery during the charge and discharge process are linked with the battery stack components, or the voltage change, coulomb efficiency, activation overpotential obtained from the current interruption test and ohmic overpotential caused by ohmic loss of the liquid flow battery during the charge and discharge process are linked with the battery stack components. The fault point of the battery stack component can be accurately determined without the need to add other related monitoring equipment. The operation is simple and convenient, and the maintenance cost is reduced. The performance of the liquid flow battery can be effectively monitored, the battery stack fault can be quickly monitored, and the reliability and operation efficiency of the battery can be improved.

[0066] In addition, real-time monitoring and fault warning: By online real-time monitoring of the operating voltage changes of the flow battery, abnormal conditions of the battery during the charging and discharging process can be discovered in time, such as sudden changes in voltage, which may be an early signal of battery failure.

[0067] Figure 2A flow chart of an online fault monitoring technology for a flow battery provided in an embodiment of the present application.

[0068] exist Figure 2 In the test, from top to bottom, the liquid flow battery is operated, and then the voltage operation curve is compared with the voltage standard working curve (charge and discharge standard curve) of the liquid flow battery. The comparison results are divided into two situations: charging voltage increase / discharging voltage decrease (charging voltage instantaneously increases or discharging voltage instantaneously decreases) and charging voltage decrease / discharging voltage increase (charging voltage instantaneously decreases or discharging voltage instantaneously increases). For the case of charging voltage increase / discharging voltage decrease, a current interruption test is required.

[0069] If the Coulomb efficiency is lower than the standard value (Coulomb standard value), the activation overpotential remains unchanged, and the ohmic overpotential increases, it indicates that the diaphragm is aged. If the Coulomb efficiency is lower than the standard value, the activation overpotential increases, and the ohmic overpotential increases or remains unchanged, it indicates that the electrode is faulty.

[0070] If the Coulomb efficiency is normal (the Coulomb efficiency is equal to the standard value), and the activation overpotential remains unchanged, but the ohmic overpotential increases, it indicates that the bipolar plate is faulty (aging or corrosion). If the Coulomb efficiency is normal, and the activation overpotential increases, but the ohmic overpotential increases or remains unchanged, it indicates that the electrode is faulty.

[0071] In the case of a decrease in charging voltage / increase in discharging voltage, it indicates that small holes appear in the diaphragm. Then the battery charging and discharging efficiency is confirmed, that is, the coulomb efficiency is lower than the standard value and the voltage efficiency is higher than the standard value (voltage efficiency standard value).

[0072] Figure 3 A schematic diagram of the structure of an online monitoring device for a flow battery stack failure provided in an embodiment of the present application includes:

[0073] at least one processor; and,

[0074] a memory communicatively connected to the at least one processor; wherein,

[0075] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute any of the above-mentioned methods for online monitoring of stack faults based on liquid flow batteries.

[0076] Some embodiments of the present application provide a non-volatile computer storage medium for online monitoring of a flow battery stack fault, which stores computer executable instructions, and the computer executable instructions can execute any of the above-mentioned methods for online monitoring of a flow battery stack fault.

[0077] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0078] The devices and media provided in the embodiments of the present application correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0079] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0080] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0084] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM), and non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0085] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0086] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0087] The above 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 changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical principle of the present application should all fall within the protection scope of the present application.

Claims

1. A method for online monitoring of stack failure based on flow battery, characterized in that: The method comprises: Constructing a voltage operating curve of the liquid flow battery during the charge and discharge operation process, and comparing the voltage operating curve with a voltage standard operating curve of the liquid flow battery; Whether a fault occurs in the stack components of the flow battery is identified based on the voltage change value, the coulombic efficiency and voltage efficiency of the charge and discharge test, or the voltage change value, the coulombic efficiency, the activation overpotential of the current interruption test and the ohmic overpotential caused by ohmic loss.

2. The method according to claim 1, characterized in that Identify whether a stack component of the flow battery fails based on the voltage change value, the coulomb efficiency and the voltage efficiency of the charge and discharge test, specifically including: When determining that the charging voltage is instantaneously reduced or the discharging voltage is instantaneously increased according to the voltage change value, comparing the coulomb efficiency with the coulomb standard value, and comparing the voltage efficiency with the voltage efficiency standard value; According to the comparison result, it is determined whether the separator of the flow battery has a fault.

3. The method according to claim 2, characterized in that Determining whether the diaphragm of the flow battery has a fault according to the comparison result specifically includes: If the coulombic efficiency is lower than the coulombic standard value and the voltage efficiency is higher than the voltage efficiency standard value, it is determined that the diaphragm of the flow battery has small pore damage.

4. The method according to claim 1, characterized in that: Identifying whether a stack component of the flow battery fails according to the voltage change value, the coulombic efficiency, the activation overpotential of the current interruption test, and the ohmic overpotential caused by ohmic loss, specifically includes: According to the current interruption voltage standard working curve of the liquid flow battery, an activation overpotential standard value and an ohmic overpotential standard value are obtained; When determining that the charging voltage is instantaneously increased or the discharging voltage is instantaneously decreased according to the voltage change value, performing a current interruption test on the flow battery to obtain an activation overpotential of the current interruption test and an ohmic overpotential caused by ohmic loss; Comparing the activation overpotential with the activation overpotential standard value, and comparing the ohmic overpotential with the ohmic overpotential standard value; Whether a fault occurs in a battery stack component of the flow battery is determined based on the potential comparison result and the coulombic efficiency.

5. The method according to claim 4, characterized in that The determining, based on the potential comparison result and the coulombic efficiency, whether a fault occurs in the battery stack component of the flow battery specifically includes: When the coulombic efficiency is lower than the coulombic standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, it is determined that the diaphragm of the flow battery is aged.

6. The method according to claim 5, characterized in that The method further comprises: When the activation overpotential increases and the ohmic overpotential remains unchanged or increases, it is determined that a fault occurs in the electrode of the flow battery.

7. The method according to claim 4, characterized in that The determining, based on the potential comparison result and the coulombic efficiency, whether a fault occurs in the battery stack component of the flow battery specifically includes: When the coulomb efficiency is equal to the coulomb standard value, when the activation overpotential remains unchanged and the ohmic overpotential increases, it is determined that the bipolar plate of the flow battery is faulty; fault types include corrosion and aging.

8. The method according to claim 7, characterized in that The method further comprises: When the activation overpotential increases and the ohmic overpotential remains unchanged or increases, it is determined that a fault occurs in the electrode of the flow battery.

9. An online monitoring device for stack faults based on a flow battery, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the online monitoring method for stack faults based on a flow battery as described in any one of claims 1 to 8.

10. A non-volatile computer storage medium for online monitoring of stack faults based on a flow battery, storing computer executable instructions, characterized in that: The computer executable instructions can execute the online monitoring method for stack faults based on a flow battery as described in any one of claims 1 to 8.

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