Flow battery insulation resistance detection method, device, medium and system

Abstract

The invention belongs to the technical field of battery detection, and particularly relates to a method for detecting the insulation resistance of a flow battery, which controls the action of a relay through a special computer module, can randomly switch a to-be-detected electric pile in an electrified environment, realizes the detection of the insulation resistance of all electric piles in one set of device, and also can detect the insulation resistance of the to-be-detected electric pile. One-time or multi-time detection can be carried out on a local specific electric pile, manual operation is not needed on the flow battery site, and the flow is convenient and safe; by isolating electromagnetic interference and suppressing power grid surge, the detection sensitivity is high, and the method is suitable for on-line detection of the all-vanadium redox flow battery. Based on the same inventive concept, the invention further provides a flow battery insulation resistance detection device, a non-transient readable recording medium storing a program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

Description

Technical Field

[0001] The invention belongs to the technical field of battery detection, and discloses a method, a device, a system for detecting insulation resistance of a flow battery, and a recording medium storing a program capable of executing the method. Background Art

[0002] The energy storage medium of the all-vanadium liquid flow battery is an aqueous solution, which is safer and more reliable, without the risk of explosion or fire, and the liquid flow battery has good uniformity. Its principle is to use the reversible changes between vanadium ions of different valence states to realize the charging and discharging of the battery, thereby achieving the purpose of mutual conversion of chemical energy and electrical energy. The vanadium ions in the all-vanadium liquid flow battery are stored in an aqueous solution, and its electrolyte is an aqueous solution of dilute sulfuric acid and vanadium, which is completely different from the low-melting-point flammable organic solvent used in lithium-ion batteries. This characteristic enables the all-vanadium liquid flow battery to greatly reduce the risk of battery overheating and explosion compared to lithium-ion batteries. Therefore, as an important energy storage device, the all-vanadium liquid flow battery has broad application prospects in new energy, smart grids and other fields. However, when the liquid flow battery is working, the electrolyte is in a flowing state, and once leakage occurs, it may cause a short circuit. To solve the above problems, insulation resistance is one of the key indicators for evaluating the electrical safety of the battery system, and its detection accuracy and efficiency are crucial to the maintenance and management of the battery system. However, traditional insulation resistance detection devices require their own power supply, are complex to operate, and are susceptible to interference. They are difficult to meet the accuracy requirements for online detection of liquid flow batteries in a working state, and are also difficult to perform real-time detection on specific battery stacks in liquid flow batteries. Summary of the invention

[0003] In view of the above problems, the present invention provides a liquid flow battery insulation resistance detection device, comprising: a main circuit, a control circuit and a relay, the main circuit comprising a busbar electrically connected to the positive electrode of each battery stack in the liquid flow battery, a shunt bar electrically connected to the negative electrode of each battery stack in the liquid flow battery, and a voltmeter; the positive and negative measuring terminals of the voltmeter are respectively connected to the shunt bar and the busbar through wires; at least one of the electrical connections corresponding to the positive and negative electrodes of each battery stack is conducted through a relay contact; the control circuit comprises a relay control module, a battery stack voltage acquisition module, a DC input module, an insulation resistance detection circuit module, a communication circuit module, a liquid flow battery, and a relay. The battery energy storage system management modules are electrically connected in sequence to form a control loop; wherein the relay control module is electrically connected to the relay coil to control the relay contacts to be turned on, and the battery stack voltage acquisition module is electrically connected to the voltmeter; the DC input module serves as a battery stack voltage information processing channel, and is provided with an isolation electromagnetic interference circuit, a grid surge suppression circuit, a DC / DC transformer, an ammeter and a digital-to-analog converter; the insulation resistance detection circuit module is used to calculate the insulation resistance of the positive and negative electrodes of the battery stack through the obtained voltage and current information; the communication circuit module is used to transmit the calculated insulation resistance to the relay control module; and it also includes a grounding module for connecting the device casing to the ground.

[0004] Preferably, the voltmeter is placed in the battery stack voltage acquisition module and is connected to the outside world by extending the positive and negative measurement terminals.

[0005] Preferably, only the electrical connection corresponding to the positive electrode of each battery stack is conducted through the relay contact.

[0006] Based on the same inventive concept, the present application also provides a method for detecting insulation resistance of a flow battery, using the above-mentioned device for detecting insulation resistance of a flow battery, comprising the following steps:

[0007] S1. Ground the housing of the flow battery insulation resistance detection device, number the relays connected to the battery stack to be tested in sequence and input the numbers into the flow battery energy storage system management module;

[0008] S2. The flow battery energy storage system management module sends instructions to the relay control module according to the preset program, so that the relay contacts with specific numbers are turned on, and the voltmeter obtains the voltage between the positive and negative electrodes of the corresponding battery stack;

[0009] S3. The voltage obtained in step S2 is isolated from electromagnetic interference through a DC input module and grid surge suppression is performed, DC / DC voltage conversion is performed, the main circuit current is measured and analog / digital conversion is performed, and the voltage and current data are input into the insulation resistance detection circuit module to calculate the insulation resistance of the positive and negative electrodes of the battery stack corresponding to the number;

[0010] S4. The communication circuit module transmits the calculated insulation resistance to the liquid flow battery energy storage system management module for archiving. The liquid flow battery energy storage system management module sends a command to the relay control module to start the insulation resistance measurement of the positive and negative electrodes of the battery stack corresponding to the next number.

[0011] Another embodiment of the present invention is to provide a non-transitory readable recording medium for storing one or more programs including a plurality of instructions. When the instructions are executed, the processor will execute the above-mentioned liquid flow battery insulation resistance detection method.

[0012] The present invention also provides a liquid flow battery insulation resistance detection system, including a processing circuit and a memory electrically coupled thereto, characterized in that the memory is configured to store at least one program, the program includes multiple instructions, and the processing circuit runs the program to execute the above-mentioned liquid flow battery insulation resistance detection method.

[0013] Compared with the prior art, the liquid flow battery insulation resistance detection device, method and system provided by the present invention can not only arbitrarily switch the battery stack to be tested in a live environment to complete the insulation resistance detection of all battery stacks in one set of equipment, but also perform single or multiple detections on local specific battery stacks. The detection device is powered by the liquid flow battery energy storage system and does not need to carry a power supply itself; the liquid flow battery does not require manual operation on site, and the process is convenient and safe; by isolating electromagnetic interference and performing grid surge suppression, the detection sensitivity is high, and it is suitable for online detection of all-vanadium liquid flow batteries, thereby improving the operating stability, safety and service life of the liquid flow battery energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the insulation resistance measurement process using the insulation resistance detection device for a flow battery in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making innovative efforts are within the scope of protection of the present invention.

[0016] The following technical solutions and attached Figure 1 , specifically describing the implementation process of the present invention, including building a flow battery insulation resistance detection platform (device embodiment) and using the platform to perform flow battery insulation resistance detection (method embodiment).

[0017] Preparation stage: First, place the all-vanadium liquid flow battery system in a stable working environment, including: main circuit, control circuit and relay. The main circuit includes a busbar electrically connected to the positive pole of each battery stack in the liquid flow battery, a shunt bar electrically connected to the negative pole of each battery stack in the liquid flow battery, and a voltmeter; the voltmeter is placed in the battery stack voltage acquisition module, and is connected to the shunt bar and the busbar through wires by extending the positive and negative measurement terminals; only the electrical connection corresponding to the positive pole of each battery stack is turned on through the relay contact; the control circuit includes a relay control module, a battery stack voltage acquisition module, a DC input module, an insulation resistance detection circuit module, a communication circuit module, and a liquid flow battery. The energy storage system management modules are electrically connected in sequence to form a control loop; wherein, the relay control module is electrically connected to the relay coil to control the relay contacts to be turned on, and the battery stack voltage acquisition module is electrically connected to the voltmeter; the DC input module serves as a battery stack voltage information processing channel, and is provided with an isolation electromagnetic interference circuit, a grid surge suppression circuit, a DC / DC transformer, an ammeter and a digital-to-analog converter; the insulation resistance detection circuit module is used to calculate the insulation resistance of the positive and negative electrodes of the battery stack through the obtained voltage and current information; the communication circuit module is used to transmit the calculated insulation resistance to the relay control module; the grounding unit of the insulation resistance detection circuit module is connected to the ground common terminal of the battery stack to be tested.

[0018] The flow battery energy storage system management module issues control instructions to the relay module, and the relay module controls the selection of the battery stack to be tested after receiving the instructions. Ensure that the connection is firm to avoid measurement errors caused by poor contact.

[0019] After the relay module selects the battery stack, the DC voltage value of the corresponding battery stack is collected through the battery stack voltage collection module.

[0020] The insulation resistance detection circuit module can obtain the DC voltage value output by the battery stack voltage acquisition module.

[0021] The positive sampling unit of the insulation resistance detection circuit module (short-circuited with the positive measurement terminal of the voltmeter) is connected to the busbar of the test stack.

[0022] The negative sampling unit of the insulation resistance detection circuit module (short-circuited with the positive measurement terminal of the voltmeter) is connected to the shunt bar of the battery stack to be tested.

[0023] The flow battery energy storage system management module issues a DC insulation resistance detection instruction to start the insulation resistance measurement function of the insulation resistance detection circuit module.

[0024] Measure insulation resistance: After the test voltage stabilizes, read the insulation resistance value returned by the insulation resistance detection circuit module on the flow battery energy storage system management module. Record this value and use it as the test result of the battery system insulation resistance.

[0025] Data processing and analysis: According to the insulation requirements, the preset threshold of insulation resistance is set, and the insulation performance of the battery system is evaluated according to the test results. If the insulation resistance value is lower than the preset threshold, it indicates that there is an insulation fault in the battery system, which needs further investigation and repair.

[0026] It will be appreciated by those skilled in the art 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 computers, available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0027] 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.

[0028] 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.

[0029] 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 A step that specifies a function in one or more boxes.

[0030] Compiling the above method steps into a program and then storing it on a hard disk or other non-transitory storage medium constitutes an embodiment of "a non-transitory readable recording medium" of the present invention; and electrically connecting the storage medium to a computer processor and completing the insulation resistance detection of the flow battery through data processing constitutes an embodiment of "a flow battery insulation resistance detection system" of the present invention.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow battery insulation resistance detection device, characterized in that include: The main circuit, the control circuit and the relay, the main circuit includes a busbar electrically connected to the positive pole of each battery stack in the liquid flow battery, a shunt bar electrically connected to the negative pole of each battery stack in the liquid flow battery, and a voltmeter; the positive and negative measuring terminals of the voltmeter are respectively connected to the shunt bar and the busbar through wires; at least one of the electrical connections corresponding to the positive and negative poles of each battery stack is conducted through the relay contact; the control circuit includes a relay control module, a battery stack voltage acquisition module, a DC input module, an insulation resistance detection circuit module, a communication circuit module, and a liquid flow battery energy storage system management module, which are electrically connected in sequence A control loop is formed; wherein the relay control module is electrically connected to the relay coil to control the relay contact to be turned on, and the battery stack voltage acquisition module is electrically connected to the voltmeter; the DC input module serves as a battery stack voltage information processing channel, and is provided with an electromagnetic interference isolation circuit, a power grid surge suppression circuit, a DC / DC transformer, an ammeter and a digital-to-analog converter; the insulation resistance detection circuit module is used to calculate the insulation resistance of the positive and negative electrodes of the battery stack through the obtained voltage and current information; the communication circuit module is used to transmit the calculated insulation resistance to the relay control module; and it also includes a grounding module for conducting the device casing with the ground.

2. A flow battery insulation resistance detection device according to claim 1, characterized in that: The voltmeter is placed in the battery stack voltage acquisition module and is connected to the outside world by extending the positive and negative measurement terminals.

3. A flow battery insulation resistance detection device according to claim 2, characterized in that: Only the electrical connection corresponding to the positive pole of each battery stack is conducted through the relay contacts.

4. A method for detecting insulation resistance of a flow battery, using the device for detecting insulation resistance of a flow battery according to claim 1, characterized in that The following steps are involved: S1. Ground the housing of the flow battery insulation resistance detection device, number the relays connected to the battery stack to be tested in sequence and input the numbers into the flow battery energy storage system management module; S2. The flow battery energy storage system management module sends instructions to the relay control module according to the preset program, so that the relay contacts with specific numbers are turned on, and the voltmeter obtains the voltage between the positive and negative electrodes of the corresponding battery stack; S3. The voltage obtained in step S2 is isolated from electromagnetic interference through a DC input module and grid surge suppression is performed, DC / DC voltage conversion is performed, the main circuit current is measured and analog / digital conversion is performed, and the voltage and current data are input into the insulation resistance detection circuit module to calculate the insulation resistance of the positive and negative electrodes of the battery stack corresponding to the number; S4. The communication circuit module transmits the calculated insulation resistance to the liquid flow battery energy storage system management module for archiving. The liquid flow battery energy storage system management module sends a command to the relay control module to start the insulation resistance measurement of the positive and negative electrodes of the battery stack corresponding to the next number.

5. A non-transitory readable recording medium for storing one or more programs including a plurality of instructions, characterized in that: When the instructions are executed, the processor will be caused to execute the method for detecting insulation resistance of a flow battery as described in claim 4.

6. A flow battery insulation resistance detection system, characterized in that It includes a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program includes a plurality of instructions, and the processing circuit runs the program to execute a flow battery insulation resistance detection method as described in claim 4.

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