CN115494404B - Online monitoring method for storage battery pack - Google Patents
Online monitoring method for storage battery pack Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 51
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
- G01R31/379—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to an on-line monitoring method of a storage battery pack, which comprises the steps of obtaining voltage information, temperature information, liquid leakage information, bulge information, pack voltage information and pack current information of a single storage battery; comparing the single storage battery voltage information, the temperature information, the liquid leakage information, the bulge information, the group voltage information and the group current information with a set single storage battery voltage threshold value, a set temperature threshold value, a set current threshold value, a set liquid leakage threshold value, a set bulge threshold value, a set voltage threshold value and a set current threshold value respectively; and if any comparison result meets the condition, triggering an alarm signal and displaying corresponding alarm information. The application can monitor the storage battery more perfectly and comprehensively, and avoid serious consequences caused by the continued use of the abnormal battery.
Description
Technical Field
The application relates to the technical field of battery monitoring, in particular to an on-line monitoring method for a storage battery pack.
Background
The lead-acid storage battery is widely applied to the power backup system in the fields of communication, electric power, banks and the like as a core part in the energy storage power backup system. The chemical energy storage mode of the storage battery is necessarily influenced by various factors such as environment, external power supply conditions and the like, and the storage battery is in a standby state for a long time, so that the performance of the storage battery is not easy to find in time and take corresponding measures after being changed, and further standby power failure is caused.
In the existing storage battery monitoring mode, maintenance personnel need to be regularly arranged to go to a storage battery machine room to check the performance of a storage battery pack in order to ensure power supply, and the problems of large checking workload, high labor cost, long checking period, inaccurate data and the like exist.
Aiming at the related technology, the inventor finds that the performance of the whole storage battery pack can be influenced after the abnormality such as capacity reduction, bulge, rupture, liquid leakage and the like occurs in a certain single battery in the storage battery pack, and the existing storage battery monitoring mode has the problems that the monitoring of battery parameters is imperfect and the state of the storage battery is difficult to comprehensively monitor.
Disclosure of Invention
Therefore, the embodiment of the application provides an on-line monitoring method for the storage battery, which can monitor the voltage information, the current information, the temperature information, the internal resistance information, the leakage information and the bulge information of the single storage battery and the storage battery on line, is beneficial to grasping the actual working state of the storage battery more fully, and timely processing when abnormality is found, prevents hidden danger, realizes intelligent and fine management of the storage battery state, and ensures the electricity use safety and property safety of a machine room.
In a first aspect, the present application provides a method for on-line monitoring of a battery pack.
The application is realized by the following technical scheme:
acquiring single battery voltage information, single battery temperature information, single battery current information, single battery leakage information, single battery bulge information, battery pack voltage information and battery pack current information;
comparing the single battery voltage information, the single battery temperature information, the single battery current information, the single battery drain information, the single battery bulge information, the battery pack voltage information and the battery pack current information with a single battery voltage threshold, a single battery temperature threshold, a single battery current threshold, a single battery drain threshold, a single battery bulge threshold, a battery pack voltage threshold and a battery pack current threshold which are preset values respectively;
when any comparison result meets the condition, triggering an alarm signal and displaying corresponding alarm information.
In a preferred example of the present application, it may be further configured to correct an initial state of charge value of the battery based on the cell voltage information and the cell current information in combination with a battery state of charge data graph;
Identifying the charge and discharge state of the battery, timing the charge and discharge process, and calculating the integral of current to time to obtain the current charge state value of the storage battery;
and correcting the current state of charge value of the storage battery according to the voltage information of the storage battery, the current information of the storage battery and the SOC data curve of the state of charge of the battery.
In a preferred embodiment of the present application, the step of identifying a charge and discharge state of the battery, counting time of the charge and discharge process, calculating an integral of current with respect to time, and obtaining a current state of charge value of the battery further includes:
when the battery is identified as being in a discharged state, the current state of charge value of the battery is:SOC in 1 SOC is the current state of charge value at the current time 0 The initial state of charge value at the initial time is Q, the rated capacity of the battery, eta, the coulombic efficiency and I, the discharge current.
In a preferred embodiment of the present application, the step of identifying a charge and discharge state of the battery, counting time of the charge and discharge process, calculating an integral of current with respect to time, and obtaining a current state of charge value of the battery further includes:
when the battery is identified as being in a charged state, the current charge of the storage battery is: In SOC 1 SOC is the state of charge value at the current time 0 The initial state of charge value at the start time is Q, the rated capacity of the battery, eta, the coulombic efficiency and I, the charging current.
In a preferred example of the present application, it may be further configured to acquire the cell voltage information and the battery voltage information by polling at preset intervals;
judging whether the voltage information of the single storage battery and the voltage information of the storage battery pack meet preset conditions or not;
and if the voltage information of the single storage battery and the voltage information of the storage battery pack do not meet the preset conditions, identifying that the terminals of the single storage battery are loose.
In a preferred example of the present application, it may be further configured to acquire the temperature information of the single battery cell by polling at preset intervals;
judging whether the temperature information of the single storage battery reaches a preset temperature value or not;
and if the temperature information of the single storage battery reaches a preset temperature value, identifying that the temperature rise of the terminal of the single storage battery is abnormal.
In a preferred embodiment of the present application, before the step of triggering the alarm signal, the method further includes:
obtaining battery information corresponding to the alarm signal at least once again;
Obtaining an average value according to the acquired battery information and the corresponding battery information acquired for the first time; calculating the difference between the battery information acquired for the first time and the average value;
adding a preset time deviation value to the ratio of the difference value to the average value to obtain a correction value;
judging whether a condition is satisfied again based on the correction value;
if so, an alarm signal is triggered.
In a preferred embodiment of the present application, before the step of triggering the alarm signal, the method further includes:
identifying the category of the alarm information corresponding to the alarm information; when at least two types of alarm information exist, the alarm information is subjected to priority sorting according to a preset priority list, wherein the priority list comprises three items of very urgent, sub-urgent and general urgent, and each item comprises at least two types of alarm information;
when the alarm information belongs to a very urgent priority, the alarm signal is triggered immediately.
In a preferred embodiment of the present application, it may be further configured to trigger the alarm signal when the alarm information belongs to a sub-emergency priority or a general emergency priority and the time interval reaches a first preset value.
In a preferred embodiment of the present application, it may be further configured to trigger the alarm signal when the alarm signal belongs to a sub-emergency priority or a general emergency priority and the number of alarm messages reaches a second preset value.
In a second aspect, the application provides an online monitoring system for leakage of a storage battery.
The application is realized by the following technical scheme:
a battery pack on-line monitoring system, the system comprising:
the system comprises an information acquisition module, a group voltage acquisition module, a group current acquisition module, a collecting unit and a background control center;
the information acquisition module is electrically connected with the anode and the cathode of the single storage battery, and is externally connected with a liquid induction belt, a temperature sensor and a resistance strain gauge, and is used for acquiring voltage information, leakage information, temperature information and swelling information of the single storage battery;
the liquid induction belt is arranged at the position of the pole of the single storage battery;
the temperature sensor is arranged at the position of a pole of the single storage battery;
the resistance strain gauge is arranged on the surface of the single storage battery;
the group voltage acquisition module is electrically connected with the anode and the cathode of the storage battery through the information acquisition module and is used for acquiring the voltage information of the storage battery;
The group current acquisition module is connected with the information acquisition module and the group voltage acquisition module in series and is used for acquiring current information of the lead acid battery;
the collecting unit is in communication connection with the information acquisition module, the group current acquisition module and the group voltage acquisition module and is used for collecting the single storage battery voltage information, the single storage battery temperature information, the single storage battery leakage information, the single storage battery bulge information, the storage battery voltage information and the storage battery current information and calculating the single storage battery internal resistance information;
the background control center is in communication connection with the collecting unit and is used for acquiring and displaying the total information of the collecting unit in real time.
In a preferred embodiment of the present application, the liquid sensing strip is fixedly connected to a position where the electrode post of the single battery is combined with the battery cover, and is configured to detect a leakage amount at the electrode post of the single battery and output a resistance change amount.
In a preferred embodiment of the application, it may be further provided that the resistance strain gauge has at least two pieces and is mounted on adjacent sides of the cell respectively.
In summary, compared with the prior art, the technical scheme provided by the embodiment of the application has the following beneficial effects:
The method comprises the steps of acquiring and monitoring single storage battery voltage information, single storage battery temperature information, single storage battery current information, single storage battery leakage information, single storage battery bulge information, storage battery voltage information and storage battery current information, timely monitoring abnormal conditions of capacity reduction, bulge, breakage and leakage of a certain single battery in the storage battery, comparing the abnormal conditions with preset thresholds respectively, triggering an alarm signal when any comparison result meets the conditions, reminding a manager to timely check and overhaul the battery, timely finding and taking corresponding measures after the change of the storage battery, guaranteeing the service performance of the whole storage battery, simultaneously displaying corresponding alarm information, helping the manager to find fault reasons, realizing online monitoring and acquisition of various state information of the storage battery, being beneficial to comprehensive and perfect monitoring, comprehensively grasping actual working states of the storage battery, carrying out early finding and early treatment on abnormal states of the storage battery, realizing intelligent and fine management of the storage battery state, and ensuring electricity safety and property safety of a machine room, and avoiding serious consequences caused by continuous use of the abnormal battery.
Drawings
FIG. 1 is a block diagram of an on-line monitoring system for a storage battery according to an embodiment of the present application;
fig. 2 is a graph showing a correspondence relationship between voltage and SOC of a battery pack in an on-line monitoring method according to another embodiment of the present application.
Fig. 3 is a flowchart of calculating the SOC of a single battery according to another embodiment of the present application.
Detailed Description
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application, may be made by those skilled in the art after reading the present specification, are provided within the scope of the patent law.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In addition, the term "and/or" in the present application is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, unless otherwise specified, the term "/" generally indicates that the associated object is an "or" relationship.
The terms "first," "second," and the like in this disclosure are used for distinguishing between similar items or items having substantially the same function and function, and it should be understood that there is no logical or chronological dependency between the terms "first," "second," and "n," and that neither the number nor the order of execution is limited.
Embodiments of the application are described in further detail below with reference to the drawings.
The application provides an on-line monitoring system of a storage battery pack, which comprises:
the system comprises an information acquisition module, a group voltage acquisition module, a group current acquisition module, a collecting unit and a background control center;
the information acquisition module is electrically connected with the anode and the cathode of the single storage battery, and is externally connected with a liquid induction belt, a temperature sensor and a resistance strain gauge, and is used for acquiring voltage information, leakage information, temperature information and swelling information of the single storage battery;
The liquid induction belt is arranged at the position of the pole of the single storage battery;
the temperature sensor is arranged at the position of a pole of the single storage battery;
the resistance strain gauge is arranged on the surface of the single storage battery;
the group voltage acquisition module is electrically connected with the anode and the cathode of the storage battery through the information acquisition module and is used for acquiring the voltage information of the storage battery;
the group current acquisition module is connected with the information acquisition module and the group voltage acquisition module in series and is used for acquiring current information of the lead-acid battery group;
the collecting unit is connected with the information collecting module, the group current collecting module and the group voltage collecting module in a communication way and is used for collecting single storage battery voltage information, single storage battery current information, single storage battery temperature information, single storage battery leakage information, single storage battery bulge information, storage battery voltage information and storage battery current information and calculating single storage battery internal resistance information;
the background control center is in communication connection with the collecting unit and is used for acquiring and displaying the summarized information of the collecting unit in real time.
Preferably, the liquid sensing belt is fixedly connected to the position where the electrode post of the single storage battery is combined with the battery cover, and is used for detecting the liquid leakage amount at the position of the electrode post of the single storage battery and outputting the resistance variation.
Preferably, the resistance strain gauge has at least two pieces and is respectively mounted on adjacent sides of the case of the unit battery.
In this embodiment, as shown in fig. 1, an on-line monitoring system for a storage battery pack includes a liquid sensing belt, a temperature sensor, a resistance strain gauge, an information acquisition module, a pack current acquisition module, a pack voltage acquisition module, a collecting unit, a switch and a background control center.
Each single storage battery is provided with an information acquisition module. The information acquisition module can adopt a low-power consumption microcontroller to monitor the voltage, temperature, leakage and bulge data of the single storage battery, and meanwhile, the information acquisition module calculates the internal resistance value of the single storage battery based on a direct current discharge method and low leakage voltage by utilizing the monitored data information, and then the internal resistance value is communicated with the collecting unit through a MODBUS/RTU protocol through a UART communication interface.
The information acquisition module is connected with the positive electrode and the negative electrode of the single storage battery through two power supply lines and acquires voltage information of the single storage battery.
The liquid induction zone is provided with two, fixes the positive pole post and the negative pole post of monomer battery respectively and the junction position department of battery cover, and when the electrolyte leakage appears in monomer battery post, the resistance value that the liquid induction zone that contacts electrolyte can change, and different weeping can arouse the different resistance value variation in liquid induction zone, consequently can convert weeping into the signal transmission for information acquisition module, information acquisition module acquires monomer battery weeping information from the signal.
The working temperature of the storage battery is increased, the temperature of the electrolyte is increased, the diffusion speed of the electrolyte is increased, the internal resistance is reduced, and the capacity of the storage battery is further improved; conversely, a decrease in battery operating temperature, a decrease in electrolyte temperature, an increase in viscosity, and a decrease in electrolyte diffusion rate may result in a decrease in battery capacity. Therefore, the battery temperature has great influence on the performance of the storage battery, and the terminal post temperature of the single storage battery is monitored in real time, so that the analysis of the performance of the storage battery by utilizing temperature data is facilitated. In this embodiment, the temperature sensor is installed in the post position of the single storage battery, and each single storage battery is provided with a temperature sensor on the positive and negative poles, and the temperature sensor senses the temperature signal of the battery post and converts the temperature signal into an electrical signal, and the electrical signal is transmitted to the information acquisition module, from which the information acquisition module acquires the temperature information of the single storage battery.
The resistance strain gauge is used for collecting deformation of the single storage battery and converting the deformation into an electric signal to be transmitted to the information collecting module. When the pressure of the gas in the storage battery shell reaches a certain pressure threshold, a safety valve on the storage battery cover can be automatically opened to release part of the gas, so that the internal pressure is reduced, and the safety valve is automatically closed; however, when the safety valve is damaged or the performance fails, the internal gas of the storage battery cannot be discharged in time, the internal pressure is too high, and the storage battery shell is deformed and swelled. The resistance strain gauge adhered to the surface of the single storage battery can deform along with the deformation of the battery shell, the deformation of the resistance strain gauge can cause the resistance value of the resistance strain gauge to change, and then the deformation of the single storage battery can be converted into an electric signal to be transmitted to the information acquisition module, and the information acquisition module acquires swelling information of the single storage battery from the electric signal.
In this embodiment, the resistance strain gauge has four and installs respectively in four sides of battery, and the resistance strain gauge on the adjacent side of monomer battery sets up along horizontal/east-west, vertically/north-south respectively, and wherein the resistance strain gauge of two broad sides sets up with top surface and bottom surface is perpendicular, and the resistance strain gauge of two narrow sides sets up with top surface and bottom surface parallel to the swell condition of monitoring monomer battery surface different height positions department, and the monitoring effect is more comprehensive and more accurate.
The single storage batteries are connected in series to form a storage battery pack, and the pack voltage acquisition module is connected with the positive electrode and the negative electrode of the storage battery pack and is used for acquiring the voltage of the storage battery pack, namely the sum of the voltages of all the single storage batteries in the storage battery pack. The group voltage acquisition module transmits the acquired storage battery voltage information to the collecting unit in a wired or wireless communication transmission mode.
The group voltage acquisition module can be externally connected with a temperature sensor and is used for acquiring the ambient temperature of a machine room where the storage battery pack is located.
The group current acquisition module is connected with the group voltage acquisition module in series and is used for acquiring the series current of the storage battery. The group current acquisition module transmits the acquired current information of the storage battery group to the collecting unit in a wired or wireless communication mode.
In this embodiment, the group current collecting module collects the charging current, the discharging current and the floating charging current of the battery group through the external current sensor, and then communicates with the collecting unit through the MODBUS/RTU protocol through the UART communication interface.
In this embodiment, the collecting unit is a core of the online monitoring system of the storage battery, and is in communication connection with the information collecting modules of all the single storage batteries, the group voltage collecting module and the group current collecting module, and is used for collecting and collecting state information such as voltage information, current information, temperature information, leakage information, bulge information and the like of the collected single storage batteries, and the group voltage information and the group current information obtained by the group voltage collecting module and the group current collecting module are analyzed, stored, displayed, analyzed and uploaded to the background control center in a wired or wireless transmission mode.
In this embodiment, the main chip of the collecting unit adopts a new Tang ARM Cortex-M4 processor, M487SIDAE, the main frequency is 192MHz, and the battery information data acquired by the information acquisition module, such as the voltage of the single battery, the internal resistance of the single battery, the temperature of the single battery, the voltage of the battery pack, the charging and discharging current and the floating charging current of the battery pack, the indoor temperature of a machine room and the like, are read through a MODBUS/RTU protocol.
In this embodiment, the collecting unit may manage 4 battery packs, each battery pack may monitor 300 single batteries, may locally display various data information of the storage battery, support audible and visual alarm, WEB interface display, parameter configuration, and the like, and also support RS485, 4G, LAN port communication, MODBUS/RTU, and TCP protocol.
The background control center is in communication connection with the collecting unit and acquires and displays the summarized information of the collecting unit in real time.
The background control center can analyze the performance of the storage battery by utilizing the summarized information, is responsible for real-time display, inquiry, operation, board division, storage, intelligent control and the like of data, and informs maintenance personnel to process in time in a short message or telephone mode and the like when abnormal information is received.
The on-line monitoring system of the storage battery monitors the state information of the storage battery perfectly according to the characteristics and the service condition of the lead-acid storage battery, comprises voltage information, current information, temperature information, internal resistance information, leakage information, bulge information and the like, monitors various state information of the storage battery in use in real time, and monitors various state information in real time by setting the threshold value of the various state information so as to timely alarm and process when the storage battery is abnormal, is favorable for timely monitoring the abnormal condition of capacity reduction, bulge, rupture and leakage of a certain single battery in the storage battery, triggers an alarm signal when the abnormal condition occurs, reminds a manager to timely check and overhaul, further is favorable for timely finding and taking corresponding measures after the change of the storage battery occurs, ensures the service performance of the whole storage battery, simultaneously displays corresponding alarm information, is favorable for helping the manager to find fault reasons, realizes monitoring and acquisition of various state information of the storage battery on line, is favorable for more comprehensive and more perfect monitoring, grasps the actual working state of the storage battery, early finds and processes the abnormal state of the storage battery, realizes intelligent and fine management of the storage battery state in time, reminds the service safety and safety of a machine room, and service life of the storage battery, and safety loss of a property are avoided.
Each module in the above-mentioned on-line monitoring system for the storage battery pack can be implemented in whole or in part by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
The application also provides an on-line monitoring method of the storage battery pack, which comprises the following steps:
acquiring single battery voltage information, single battery temperature information, single battery current information, single battery leakage information, single battery bulge information, battery pack voltage information and battery pack current information;
the method comprises the steps of comparing single battery voltage information, single battery temperature information, single battery current information, single battery drain information, single battery bulge information, battery pack voltage information and battery pack current information with preset single battery voltage threshold, single battery temperature threshold, single battery current threshold, single battery drain threshold, single battery bulge threshold, battery pack voltage threshold and battery pack current threshold respectively;
When any comparison result meets the condition, triggering an alarm signal and displaying corresponding alarm information.
In this embodiment, the specific limitation of a method for online monitoring a battery pack may be referred to above as limitation of an online monitoring system for a battery pack, and will not be described herein. The information acquisition module acquires voltage information, temperature information, current information, leakage information, bulge information, group voltage information and group current information of the single storage battery, then transmits acquired data to the collecting unit in real time, and the collecting unit compares various state information of the storage battery with a preset voltage threshold value, a preset temperature threshold value, a preset current threshold value, a preset leakage threshold value, a preset bulge threshold value, a preset group voltage threshold value and a preset group current threshold value, judges whether the various state information is in a normal range or not, and if the comparison result of any state information shows that the single storage battery is in an abnormal state, the condition for triggering an alarm signal is met, the alarm signal is triggered, and meanwhile corresponding alarm information is displayed.
In this embodiment, the preset voltage threshold, temperature threshold, current threshold, drain threshold, bulge threshold, group voltage threshold and group current threshold may be set by human experience, or may be obtained automatically by a machine learning algorithm.
Preferably, as shown in fig. 2, the initial state of charge value of the battery is corrected based on the cell voltage information and the cell current information in combination with the battery state of charge SOC data map. The lead-acid storage battery is charged or discharged by adopting fixed current such as 0.2C or 0.5C, and a corresponding relation curve of voltage and the state of charge (SOC) of the battery, namely a battery state of charge data curve, can be obtained respectively. And combining the voltage obtained by charging and discharging the lead-acid storage battery with various fixed currents and the corresponding relation curve of the state of charge (SOC) of the battery, and simulating a data curve diagram of the current, the voltage and the state of charge (SOC) of the battery so as to provide a more accurate data basis for correcting the initial state of charge value of the battery.
Identifying the charge and discharge state of the battery, timing the charge and discharge process, and calculating the integral of current to time to obtain the current charge state value of the storage battery;
and correcting the current state of charge value of the storage battery according to the voltage information of the single storage battery, the current information of the single storage battery and the state of charge data curve of the battery. Specifically, before the battery is charged and discharged, detecting a data graph of the battery voltage and the battery state of charge (SOC) according to the simulated battery current, calculating a battery state of charge (SOC) value according to the battery state of charge data graph, and taking an average value of the two battery state of charge (SOCs) as an initial SOC value together with the last stored SOC value of the device. And when the charge and discharge are finished, the calculated state of charge SOC value of the battery is integrated, then a curve diagram of the corresponding relation between the battery voltage and the state of charge SOC of the battery is detected according to the charge and discharge current and the simulated battery current, the state of charge SOC value of the battery is calculated according to the battery state of charge data diagram, and the average value of the two state of charge SOC values is taken as the state of charge SOC value of the battery after the charge and discharge of the battery are finished, so that the current state of charge value of the storage battery is corrected.
Preferably, the step of identifying the charge and discharge state of the battery, counting the time of the charge and discharge process, and calculating the integral of the current to the time to obtain the current state of charge value of the storage battery further comprises:
when the battery is identified as being in a discharged state, the current state of charge value of the battery is:SOC in 1 SOC is the current state of charge value at the current time 0 The initial state of charge value at the initial time is Q, the rated capacity of the battery, eta, the coulombic efficiency and I, the discharge current.
Preferably, the step of identifying the charge and discharge state of the battery, counting the time of the charge and discharge process, and calculating the integration of the current to the time to obtain the current state of charge value of the storage battery further includes:
when the battery is identified as being in a state of charge, the current state of charge value of the battery is:in SOC 1 SOC is the state of charge at the current time 0 For the state of charge at the start time, Q is the battery rated capacity, η is the coulombic efficiency, and I is the charging current.
SOC (State of charge) represents the remaining capacity of a battery, which is defined numerically as the ratio of the remaining capacity to the battery capacity, and is usually expressed as a percentage, and ranges from 0 to 1. When the state of charge (SOC) of the battery is 0, the battery is completely discharged; when the battery state of charge SOC is 1, it indicates that the battery is fully charged.
In this embodiment, the collecting unit is built with an advanced algorithm model, so that the battery state of charge SOC and the battery state of health SOH of the single battery and the whole battery can be accurately calculated.
Specifically, as shown in fig. 3, the charge and discharge states of the battery can be identified by acquiring the working state mode information of the battery, and if the battery is in the working mode, the battery is identified as the discharge state; if the battery is in the charging mode, the battery is identified as being in a charging state.
And calculating the SOC of the battery by adopting an ampere-hour integration method, timing the charging and discharging process, calculating the integration of current and time to obtain the current SOC value of the storage battery, wherein the charging state is a negative value, the discharging state is a positive value, and measuring the current of the main circuit of the battery in real time. The charging process, the initial electric quantity is used to add the integral result to obtain the current state of charge value; and in the discharging process, subtracting the integral result from the initial electric quantity to obtain the current state of charge value.
By reading the voltage information and the charge-discharge current information of the single storage battery, the initial state-of-charge value SOC of the current battery is estimated according to the corresponding relation between the voltage information and the charge-discharge current information of the single storage battery and the state-of-charge SOC of the battery 0 . The initial value SOC of the charge state of the battery is calibrated by adopting the voltage of the single battery cell and the charge-discharge current 0 The method can organically combine the safe time integration method with the single battery voltage, overcomes the defect of accumulated error of the traditional safe time integration method by using the single battery voltage, realizes accurate estimation of the SOC of the battery, is favorable for timely monitoring the abnormal conditions of capacity reduction, bulge, rupture and leakage of a certain single battery in the battery pack, and triggers an alarm signal to remind a manager when the abnormal conditions occurChecking and overhauling are carried out, and then corresponding measures are found and taken in time after the change of the storage battery pack is caused, so that the service performance of the whole storage battery pack is ensured, and the real-time state of the storage battery is monitored more accurately.
Preferably, the voltage information of the single storage battery and the voltage information of the storage battery pack are acquired in a polling mode according to preset interval time;
judging whether the voltage information of the single storage battery and the voltage information of the storage battery pack meet preset conditions or not;
And if the voltage information of the single storage battery and the voltage information of the storage battery pack do not meet the preset conditions, identifying that the terminals of the single storage battery are loose.
Specifically, the collecting unit polls and acquires voltage information of the single storage battery and voltage information of the storage battery at intervals of 20ms, and judges whether the voltage information of the single storage battery and the voltage information of the storage battery meet preset conditions, such as whether the voltage information of the storage battery and the voltage information of the single storage battery are larger than corresponding preset thresholds; when voltage information of a single storage battery and voltage information of a storage battery pack do not meet preset conditions, the fact that the terminals of the single storage battery are loose can be identified, so that contact conditions of connecting wires of the terminals of the battery can be monitored and identified on line, poor loose contact of the terminals can be found, maintenance can be conducted in time, and the fact that the terminals heat due to the fact that the terminals are loose is avoided, and other potential safety hazards are caused. Meanwhile, the storage battery pack of the single storage battery with loose terminals can be identified, and convenience is brought to maintenance personnel for checking and processing.
Preferably, the temperature information of the single storage battery is obtained through polling according to a preset interval time;
judging whether the temperature information of the single storage battery reaches a preset temperature value or not;
And if the temperature information of the single storage battery reaches a preset temperature value, identifying that the temperature rise of the terminal of the single storage battery is abnormal.
Specifically, the collecting unit polls and acquires temperature information of the single storage battery at intervals of 20ms, judges whether the temperature of the storage battery reaches a preset temperature value, and can identify that the temperature rise of the terminals of the single storage battery is abnormal when the temperature of the single storage battery reaches the preset temperature value, namely the temperature of the single storage battery exceeds the value of the normal working temperature range of the preset storage battery. Poor contact of the terminal parts of the single storage battery can lead to poor conduction, and the contact part can generate heat seriously, so that the output voltage is lower. Meanwhile, the combination of the terminal component and the sealant can be influenced, and the liquid leakage phenomenon can occur, so that the service life of the storage battery is influenced. Therefore, the monitoring of the temperature information of the storage battery is necessary, and once the abnormal temperature rise is found, the storage battery can be timely checked and repaired, so that the storage battery can be ensured to be used under normal conditions, and the service life of the storage battery is prolonged.
The collecting unit adopts a polling mode to read state data of the single storage battery and current and voltage data of the storage battery pack, and polls an acquisition submodule at intervals of 20ms, wherein the data comprises: the method comprises the steps of analyzing, storing, displaying and uploading data to a network monitoring platform, wherein the voltage, the temperature, the internal resistance, the liquid leakage, the bulge, the group voltage, the charge-discharge current, the floating charge current and the like of the single battery; the built-in advanced algorithm model can accurately calculate the SOC and SOH of the single battery and the whole battery, accurately identify the current state of the battery, and intelligently identify the loosening of the battery terminal and the abnormal temperature rise of the battery terminal. The intelligent early warning battery thermal runaway, battery open circuit, short circuit, liquid leakage, bulge and the like support online program version rising, realize networking and intelligent remote online centralized monitoring and management, and ensure safe operation of the battery.
Preferably, the step of triggering the alarm signal further comprises, before: obtaining battery information corresponding to the alarm signal at least once again; obtaining an average value according to the acquired battery information and the corresponding battery information acquired for the first time; calculating the difference between the battery information acquired for the first time and the average value; adding a preset time deviation value to the ratio of the difference value to the average value to obtain a correction value; based on the correction value, whether the condition is satisfied is judged again; if so, an alarm signal is triggered.
Specifically, taking the case that the temperature information of the single storage battery exceeds the preset temperature threshold value of the single storage battery, and before triggering the temperature alarm signal, the battery information corresponding to the alarm signal is acquired once again for illustration, and when the temperature information T of the single storage battery is acquired for the first time 1 When the temperature threshold value of the single storage battery exceeds the preset temperature threshold value, acquiring the temperature information of the single storage battery again before triggering the temperature alarm signal to obtain T 2 Indicating the cell temperature information T to be acquired again 2 With the temperature information T of the single accumulator obtained for the first time 1 Adding to averageI.e. < ->Calculating temperature information T of the single storage battery obtained for the first time 1 Mean value- >Difference DeltaT of->Finally, the difference delta T is compared with the average valueIn this embodiment, the time deviation value t is set according to human experience to obtain a final correction value +.>I.e. < ->Based on the temperature correction value->The temperature information T of the single storage battery obtained again 2 And the obtained temperature correction value->Comparing, judging whether the condition is satisfied again, if so, obtaining the temperature information T of the monomer battery again 2 Exceeding the temperature correction value->I.e. the condition is fulfilled,at this point an alarm signal is triggered. The secondary judgment is carried out by acquiring the battery information corresponding to the alarm signal again, and the preset threshold value is corrected according to the actual condition of the storage battery, so that the accuracy of the alarm result is effectively improved, the condition that the alarm signal is triggered due to accidental fluctuation of the acquired battery information can be avoided, and the false alarm rate of the system is reduced. Meanwhile, the use of the battery is required to be interrupted after the alarm signal is generated and before the maintenance and overhaul of the storage battery are carried out, so that unnecessary alarm signals can be eliminated through the technical means, the interference to the storage battery caused by the interruption of the maintenance of the battery is reduced, and the workload of related maintenance personnel is reduced.
Preferably, before the step of triggering the alarm signal, the method further comprises:
identifying the category of the alarm information corresponding to the alarm information; when at least two types of alarm information exist, the alarm information is subjected to priority sorting according to a preset priority list, wherein the priority list comprises three items of very urgent, sub-urgent and general urgent, and each item comprises at least two types of alarm information;
when the alarm information belongs to a very urgent priority, the alarm signal is triggered immediately.
Preferably, the alarm signal is triggered when the alarm information belongs to a secondary or general emergency priority and the time interval reaches a first preset value.
Preferably, the alarm signal is triggered when the alarm signal belongs to a secondary or general emergency priority and the number of alarm messages reaches a second preset value.
Specifically, the category of the alert signal is identified prior to triggering the alert signal. In this embodiment, the alarm signal is classified into a single battery voltage alarm signal, a single battery temperature alarm signal, a single battery current alarm signal, a single battery leakage alarm signal, a single battery bulge alarm signal, a battery voltage alarm signal, and a battery current alarm signal. All alarm signal categories are prioritized, such as being classified into very urgent, sub-urgent and general urgent. The emergency list contains a single storage battery leakage alarm signal and a single storage battery bulge alarm signal; the secondary emergency list comprises a single storage battery temperature alarm signal, a single storage battery current alarm signal and a single storage battery voltage alarm signal; the emergency list typically contains battery voltage warning signals and battery current warning signals. The priority ordering of the alarm signals of different categories can be adjusted according to the requirements of different situations.
If the alarm signal is a single battery leakage alarm signal and/or a single battery bulge alarm signal, the alarm signal belongs to a very urgent priority, and needs to be triggered immediately to inform maintenance personnel to immediately check and maintain.
If the alarm signal is of secondary emergency or general emergency priority, triggering the alarm signal when the time interval reaches a first preset value after the alarm information appears. In this embodiment, the first preset value may be set to 3h.
If the alarm signal belongs to the secondary emergency or general emergency priority, and when the number of the alarm information under the priority reaches a second preset value, triggering the alarm signal. In this embodiment, the second preset value may be 30 pieces.
By the technical means, the alarm is carried out according to the priority order, and the current workload of the system can be reduced under the condition of better ensuring the service performance of the whole storage battery pack, so that the problems of downtime and the like caused by overload work of the system are prevented, and the monitoring performance is further influenced.
In summary, the method for on-line monitoring the storage battery pack is beneficial to timely monitoring the abnormal conditions of capacity reduction, swelling, breakage and leakage of a certain single battery in the storage battery pack by acquiring and monitoring single battery voltage information, single battery temperature information, single battery current information, single battery leakage information, single battery swelling information, storage battery voltage information and storage battery current information, comparing the abnormal conditions with preset thresholds respectively, triggering an alarm signal at the moment when any comparison result meets the conditions, reminding a manager to timely check and overhaul, further facilitating finding out and taking corresponding measures after the storage battery pack changes, ensuring the service performance of the whole storage battery pack, simultaneously displaying corresponding alarm information, helping the manager to find out fault reasons, realizing on-line monitoring and collecting various state information of the storage battery, being beneficial to more comprehensive and perfect monitoring, more comprehensively grasping the actual working state of the storage battery, carrying out early finding out early treatment on the abnormal state of the storage battery, realizing intelligent and refined management of the storage battery state, and avoiding the continuous use of the seriously-appearing battery in a machine room.
It should be understood that the order of execution of the processes in the above embodiments should be determined by the functions and internal logic thereof, and should not be construed as limiting the implementation of the embodiments of the present application.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the system of the present application is divided into different functional units or modules to perform all or part of the above-described functions.
Claims (9)
1. An on-line monitoring method for a storage battery pack, comprising the steps of:
acquiring single battery voltage information, single battery temperature information, single battery current information, single battery leakage information, single battery bulge information, battery pack voltage information and battery pack current information;
comparing the single battery voltage information, the single battery temperature information, the single battery current information, the single battery drain information, the single battery bulge information, the battery pack voltage information and the battery pack current information with a preset single battery voltage threshold, a preset single battery temperature threshold, a preset single battery current threshold, a preset single battery drain threshold, a preset single battery bulge threshold, a preset battery pack voltage threshold and a preset battery current threshold respectively;
When any comparison result meets the condition, triggering an alarm signal and displaying corresponding alarm information at the same time; before the step of triggering the alarm signal, the method further comprises the following steps:
obtaining battery information corresponding to the alarm signal at least once again;
obtaining an average value according to the acquired battery information and the corresponding battery information acquired for the first time;
calculating the difference between the battery information acquired for the first time and the average value;
adding a preset time deviation value to the ratio of the difference value to the average value to obtain a correction value;
judging whether a condition is satisfied again based on the correction value; and
identifying the category of the alarm information corresponding to the alarm information; when at least two types of alarm information exist, the alarm information is subjected to priority sorting according to a preset priority list, wherein the priority list comprises three items of very urgent, sub-urgent and general urgent, and each item comprises at least two types of alarm information;
the emergency list comprises single storage battery leakage alarm information and single storage battery bulge alarm information; the secondary emergency list comprises single storage battery temperature alarm information, single storage battery current alarm information and single storage battery voltage alarm information; the general emergency list contains battery voltage alarm information and battery current alarm information;
And triggering an alarm signal when the correction value meets the condition and the alarm information belongs to the secondary emergency priority or the general emergency priority and the time interval reaches a first preset value and the number of the alarm information reaches a second preset value.
2. The method for on-line monitoring of a battery pack according to claim 1, further comprising:
based on the single storage battery voltage information and the single storage battery current information, correcting an initial state of charge value of the battery by combining a battery state of charge data graph;
identifying the charge and discharge state of the battery, timing the charge and discharge process, and calculating the integral of current to time to obtain the current state of charge value of the storage battery;
and correcting the current state of charge value of the storage battery according to the voltage information of the single storage battery, the current information of the single storage battery and the state of charge data curve of the battery.
3. The method for on-line monitoring a battery pack according to claim 2, wherein the steps of identifying the charge and discharge states of the battery, counting the time of the charge and discharge processes, and calculating the integral of the current with respect to time, and obtaining the present state of charge value of the battery further comprise:
when the battery is identified as being in a discharged state, the current state of charge value of the battery is: SOC (State of Charge) 1 = SOC 0 -1/QIn-flight SOC 1 SOC is the current state of charge value at the current time 0 The initial state of charge value at the initial time is Q, the rated capacity of the battery, eta, the coulombic efficiency and I, the discharge current.
4. The method for on-line monitoring a battery pack according to claim 2, wherein the steps of identifying the charge and discharge states of the battery, counting the time of the charge and discharge processes, and calculating the integral of the current with respect to time, and obtaining the present state of charge value of the battery further comprise:
when the battery is identified as being in a charged state, the current charge of the storage battery is: SOC (State of Charge) 1 = SOC 0 +1/QIn SOC 1 SOC is the state of charge value at the current time 0 The initial state of charge value at the initial time is Q the rated capacity of the battery, eta the coulombic efficiency and I the charging current.
5. The method for on-line monitoring of a battery pack according to claim 1, further comprising:
polling according to preset interval time to acquire the voltage information of the single storage battery and the voltage information of the storage battery pack;
judging whether the voltage information of the single storage battery and the voltage information of the storage battery pack meet preset conditions or not;
and if the voltage information of the single storage battery and the voltage information of the storage battery pack do not meet the preset conditions, identifying that the terminals of the single storage battery are loose.
6. The method for on-line monitoring of a battery pack according to claim 5, wherein,
polling according to preset interval time to acquire the temperature information of the single storage battery;
judging whether the temperature information of the single storage battery reaches a preset temperature value or not;
and if the temperature information of the single storage battery reaches a preset temperature value, identifying that the temperature rise of the terminal of the single storage battery is abnormal.
7. A battery pack on-line monitoring system, characterized in that it is applied to the battery pack on-line monitoring method according to any one of claims 1 to 6, the system comprising:
the system comprises an information acquisition module, a group voltage acquisition module, a group current acquisition module, a collecting unit and a background control center;
the information acquisition module is electrically connected with the anode and the cathode of the single storage battery, and is externally connected with a liquid induction belt, a temperature sensor and a resistance strain gauge, and is used for acquiring voltage information, leakage information, temperature information and swelling information of the single storage battery;
the liquid induction belt is arranged at the position of the pole of the single storage battery;
the temperature sensor is arranged at the position of a pole of the single storage battery;
The resistance strain gauge is arranged on the surface of the single storage battery;
the group voltage acquisition module is electrically connected with the anode and the cathode of the storage battery through the information acquisition module and is used for acquiring the voltage information of the storage battery;
the group current acquisition module is connected with the information acquisition module and the group voltage acquisition module in series and is used for acquiring current information of the lead-acid battery group;
the collecting unit is in communication connection with the information acquisition module, the group current acquisition module and the group voltage acquisition module and is used for collecting the single storage battery voltage information, the single storage battery temperature information, the single storage battery leakage information, the single storage battery bulge information, the storage battery voltage information and the storage battery current information and calculating the single storage battery internal resistance information;
the background control center is in communication connection with the collecting unit and is used for acquiring and displaying the summarized information of the collecting unit in real time.
8. The battery pack on-line monitoring system according to claim 7, wherein the liquid sensing strip is fixedly connected to a position where the post of the single battery is combined with the battery cover, and is configured to detect a leakage amount at the position of the post of the single battery and output a resistance variation.
9. The battery pack on-line monitoring system of claim 7 wherein the resistive strain gauge is at least two and is mounted on adjacent sides of the cell respectively.
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| CN116936978B (en) * | 2023-09-19 | 2023-11-21 | 广州杉和信息科技有限公司 | Intelligent monitoring method and system for storage battery bulge |
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