Non-stop replacement device for outdated batteries in DC battery packs of substations

Abstract

The present invention discloses a non-stop replacement device for lagging batteries in a DC battery pack of a substation, and relates to the technical field of power supply maintenance of substations. In order to solve the problems in the prior art, such as lack of comprehensive real-time monitoring and early warning functions, limited data processing and analysis capabilities, inability to deeply evaluate the operating status of the battery pack, low system integration and intelligence level, and inability to realize automated fault diagnosis and battery replacement processes; by integrating a battery monitoring unit, it is possible to collect and analyze the operating data of the battery pack in real time, determine the location of the faulty battery, and perform polarity testing to ensure the safety of the replacement process; the main pass unit maintains the main circuit path, and guides the current to the monitoring unit for sampling through a current shunt to realize continuous monitoring of the battery pack; it effectively improves the maintenance efficiency and safety of the battery pack, reduces the operation and maintenance costs, and provides a strong guarantee for the safe and stable operation of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply maintenance for transformer substations, and in particular to a device for replacing lagging batteries of a DC storage battery group in a transformer substation without power outage. Background Art

[0002] In the entire DC power supply system of the substation, the battery pack is the last line of defense for the network power supply of the equipment, and its importance in the substation is self-evident. For example, the Chinese patent with the announcement number: CN205861826U discloses a multifunctional DC battery junction box, including a junction box, which is provided with a set of test circuits, a main pass circuit, two parallel multi-head quick terminal blocks and a display circuit; the positive and negative poles of the test circuit are parallel to the positive and negative poles of the junction box, and are electrically independent of each other; there is also an audible and visual alarm connected in series with the test circuit; the positive and negative poles of the test circuit are parallel to the positive and negative poles of the main pass circuit and are electrically independent; the positive and negative poles of the main pass circuit each have two DC quick terminals, and a current shunt is connected in series in its circuit, and a display circuit is added in parallel with the shunt; the display circuit is connected to a display screen, and the display screen displays the current parameters passing through the main pass circuit, and monitors in real time whether the online battery pack is interrupted.

[0003] Although the above patent achieves efficient work load reduction through real-time display of current parameters and reduces the operating risk during the DC system battery maintenance process, the following problems still exist:

[0004] 1. In the prior art, although an audible and visual alarm is connected in series with the test circuit, it lacks comprehensive real-time monitoring and early warning functions for the operating status of the battery pack, especially in terms of temperature anomalies and fault diagnosis;

[0005] 2. The existing junction box has limited data processing and analysis capabilities, and cannot conduct in-depth analysis and evaluation of the operating data of the battery pack to determine whether there is a faulty battery and determine the location of the faulty battery;

[0006] 3. The existing junction box system has a low degree of integration and limited intelligence, and cannot realize automated fault diagnosis and battery replacement processes. Summary of the invention

[0007] The purpose of the present invention is to provide a device for replacing lagging batteries in a DC battery group of a substation without power outage. By displaying the current in real time, it achieves efficient work load reduction, improves work efficiency, reduces the operating risks of substation automation and protection equipment during the maintenance of DC system batteries, ensures the safe and stable operation of the power grid, and solves the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A non-stop replacement device for lagging batteries in a DC storage battery group of a substation comprises a junction box, in which a group of test circuits, a group of main circuits, two parallel multi-head quick terminal blocks and a display circuit are arranged; an overcurrent protection device is connected in series to the main circuit, and the output port of the overcurrent protection device is connected to the sound and light alarm system in the junction box;

[0010] The junction box further comprises:

[0011] A battery monitoring unit, used to collect the monitored battery pack operation data in real time based on the display circuit, and determine the location of the faulty battery based on the battery pack operation data;

[0012] A battery testing unit, used to test the polarity of the faulty battery before replacing the battery based on the determined location information of the faulty battery, and to feed back the test result to the sound and light alarm system;

[0013] The main pass unit is used to connect the battery to be replaced and the main power circuit based on two DC fast terminals, maintain the main circuit access, and lead the main pass circuit current to the battery monitoring unit for sampling based on the current shunt.

[0014] Furthermore, a temperature sensor is installed on one side of the junction box close to the main circuit, and the output end of the temperature sensor is connected to the temperature monitoring module. The temperature monitoring module interacts with the sound and light alarm system for data. When the temperature monitoring module detects abnormal temperature, an alarm is immediately sounded through the sound and light alarm system.

[0015] Furthermore, the temperature monitoring module is used to obtain the temperature data of the battery pack in real time, and can also predict the temperature distribution and thermal management requirements of the battery pack based on the temperature data of the battery pack in combination with the ambient temperature and the battery charging and discharging status.

[0016] Furthermore, the battery monitoring unit comprises:

[0017] An operation data sampling module is used to collect the operation data of the battery pack in real time and store the collected operation data of the battery pack in a database;

[0018] The data processing module is used to process and analyze the collected operating data, evaluate the performance status of the battery, determine whether there is a faulty battery based on the performance evaluation results, and determine the location of the faulty battery based on the fault diagnosis results.

[0019] Furthermore, the running data sampling module also includes:

[0020] The battery pack is left at a preset temperature for a preset time, the temperature difference between the battery pack and the preset temperature is controlled within a target difference allowable range, and the discharge time of the battery pack is set;

[0021] Based on the discharge time, the battery pack is discharged with a constant current until its voltage value reaches a cut-off voltage, thereby obtaining effective operation data of the battery pack;

[0022] The battery pack operation data collected and monitored in real time are filtered based on the effective operation data of the battery pack to obtain the target operation data of the battery pack, wherein the target operation data corresponds to the operation status of the battery pack one by one.

[0023] Furthermore, the data sampling module is operated to exchange data with the temperature monitoring module, and the temperature of the battery pack is acquired based on the temperature sensor.

[0024] Furthermore, the preset time length is determined by the following steps, including:

[0025] Extract the maximum and minimum tolerable temperatures of the entire battery pack;

[0026] Extracting the theoretical maximum temperature rise amplitude corresponding to the unit time of the battery pack; wherein the value range of the unit time is 2min-7min;

[0027] Obtaining a first time setting coefficient by using the maximum tolerance temperature and the minimum tolerance temperature of the battery pack in combination with a theoretical maximum temperature rise amplitude corresponding to a unit time of the battery pack;

[0028] The first time setting coefficient is obtained by the following formula:

[0029] ;

[0030] Among them, S 01 Indicates the first time setting coefficient; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the battery pack; W d Indicates the theoretical maximum temperature rise of the battery pack per unit time; W g Indicates the ambient temperature corresponding to the working environment of the battery pack; W c Indicates the maximum temperature difference of the working environment of the battery pack within 24 hours; V f Indicates the maximum theoretical voltage variation of the battery pack output voltage; V c Indicates the maximum allowable output voltage variation range that meets the operating requirements during the operation of the battery pack;

[0031] Acquire a second time setting coefficient using temperature information of each battery block included in the battery pack;

[0032] The first time setting coefficient and the second time setting coefficient are used to set a preset time length; wherein the preset time length is obtained by the following formula:

[0033] ;

[0034] Among them, T y Indicates the preset time length; T d Indicates the duration corresponding to a unit of time; S 01 Indicates the first time setting coefficient; S 02 Indicates the second time setting coefficient; INT() means rounding up the value in the brackets.

[0035] Further, the second time setting coefficient is obtained by using the temperature information of each battery block included in the battery pack, including:

[0036] Extract the maximum and minimum tolerable temperatures of each battery block contained in the battery pack;

[0037] Extracting a ratio value between the battery capacity of each battery block included in the battery pack and the overall battery capacity of the battery pack;

[0038] Obtaining a battery evaluation coefficient corresponding to each battery block by using the maximum and minimum tolerance temperatures of each battery block combined with a ratio of the battery capacity of each battery block to the overall battery capacity of the battery pack;

[0039] The battery evaluation coefficient corresponding to each battery block is obtained by the following formula:

[0040] ;

[0041] Where K represents the battery evaluation coefficient corresponding to each battery block; B represents the ratio between the battery capacity of each battery block and the overall battery capacity of the battery pack; W zmax and W zmin Respectively represent the maximum and minimum tolerable temperatures of each battery block; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the entire battery pack;

[0042] The battery evaluation coefficients corresponding to each battery block are integrated to obtain a second time setting coefficient, wherein the second time setting coefficient is obtained by the following formula:

[0043] ;

[0044] Among them, S 02 represents the second time setting coefficient; m represents the number of battery blocks contained in the battery pack; K i Indicates the battery evaluation coefficient corresponding to the i-th battery block in the battery pack; K b represents the standard deviation of the battery evaluation coefficient corresponding to m battery blocks; K p Represents the average value of the battery evaluation coefficients corresponding to m battery blocks.

[0045] Furthermore, the data processing module is specifically:

[0046] Performing statistical analysis on the target operating data to calculate the average voltage, average current and average temperature of each battery in the battery pack;

[0047] Determine target values ​​of the voltage operation data group and the capacitance operation data group of each storage battery, and draw voltage change curves and capacitance change curves of the voltage operation data group and the capacitance operation data group of each storage battery based on the target values;

[0048] Construct a battery performance degradation evaluation model, analyze the voltage change trend, current change trend and temperature change trend of each battery based on the battery performance degradation evaluation model, and obtain the performance evaluation value of each battery;

[0049] Based on the comparison between the performance evaluation value and the preset threshold, it is determined whether each battery is abnormal, and the abnormal battery is located based on the determination result;

[0050] The location information of the faulty battery is displayed on the display.

[0051] Furthermore, the battery testing unit specifically comprises the following steps:

[0052] Marking the front and rear batteries of the faulty battery based on the location information thereof, and conducting a same-polarity test connection between the positive and negative electrodes of the faulty battery based on a test circuit, wherein the test circuit and the faulty battery form a closed circuit;

[0053] If the polarity of the wiring in the test loop is reversed, the sound and light alarm system is immediately triggered, and the sound and light alarm system indicates to the operator that the current wiring polarity is wrong based on sound and light signals;

[0054] If the current wiring polarity is correct, disconnect the test circuit from the faulty battery, connect the positive and negative terminals of the main pass circuit to the positive and negative terminals of the faulty battery, jumper the faulty battery from the front-end circuit, and disconnect the main pass circuit from the replacement battery.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] 1. The device for replacing lagging batteries in a DC battery pack of a substation without power outages proposed in the present invention realizes the rapid and safe replacement of faulty batteries by integrating a test circuit, a main circuit, a display circuit, and an audible and visual alarm system, effectively avoiding the risk of short circuit and equipment damage caused by wrong polarity connection, while improving operating efficiency and safety and reducing operation and maintenance costs. The device ensures uninterrupted power supply to the battery pack during the replacement process by real-time monitoring and displaying current parameters, ensuring the stable operation of the power grid, and improves the accuracy of fault diagnosis and maintenance efficiency through precise data analysis of the battery monitoring unit, providing strong support for the safe and stable operation of the power grid.

[0057] 2. The device for replacing lagging batteries of DC battery packs in substations proposed in the present invention can collect and analyze the operating data of the battery pack in real time, determine the location of the faulty battery, and perform polarity test to ensure the safety of the replacement process through an integrated battery monitoring unit; the main pass unit maintains the main circuit access and leads the current to the monitoring unit for sampling through a current shunt to achieve continuous monitoring of the battery pack; it effectively improves the maintenance efficiency and safety of the battery pack, reduces operation and maintenance costs, and provides a strong guarantee for the safe and stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a module diagram of the device for replacing lagging batteries in a DC battery pack of a substation without power outages according to the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In order to solve the technical problems in the existing technology, such as lack of comprehensive real-time monitoring and early warning functions, limited data processing and analysis capabilities, inability to deeply evaluate the operating status of the battery pack, low system integration and intelligence level, and inability to realize automated fault diagnosis and battery replacement process, please refer to Figure 1 , this embodiment provides the following technical solutions:

[0061] A non-stop replacement device for lagging batteries in a DC storage battery group of a substation comprises a junction box, in which a group of test circuits, a group of main circuits, two parallel multi-head quick terminal blocks and a display circuit are arranged; an overcurrent protection device is connected in series to the main circuit, and the output port of the overcurrent protection device is connected to the sound and light alarm system in the junction box;

[0062] In this embodiment, the polarity of the battery is detected through the test circuit to avoid short circuit caused by wrong connection, and the operator is reminded through sound and light alarm. The main circuit connects the battery to be replaced and the main power circuit to maintain the main circuit access, and the current data is collected through the current shunt. The quick terminal is convenient for connecting the power supply and the nuclear capacity meter, and the lead wire is protected for easy handling. The display circuit is connected to the display screen to display the current parameters in real time and monitor the working status of the battery pack.

[0063] The positive and negative poles of the test circuit are arranged in parallel with the positive and negative poles of the junction box, and an audible and visual alarm system is connected in series in the test circuit; the positive and negative poles of the test circuit are arranged in parallel with the positive and negative poles of the main circuit, and are electrically independent of each other;

[0064] The test circuit includes a polarity detection device, which is electrically connected to the sound and light alarm system for detecting the polarity during the test connection and controlling the activation of the alarm system; wherein the polarity detection device and the sound and light alarm system are integrated in the junction box to facilitate the operator to perform a quick and safe test before jumpering the battery;

[0065] The positive and negative poles of the main pass circuit are respectively provided with two DC fast terminals, and a current shunt is connected in series in the main pass circuit, and the display circuit is connected in parallel with the current shunt;

[0066] The two parallel multi-head quick terminal posts are used to electrically connect the power supply at the upper end of the main fuse at the bottom of the screen cabinet to the junction box to avoid arcing and voltage fluctuations during operation; construct at least one connection point for electrically connecting to the test clamp of the capacity tester during the battery capacity test process for sampling. Since the junction box quick connector is not incorporated into the temporary battery at this time, sparking and voltage instability are avoided during operation, and multiple terminals are provided to the capacity tester to meet the test clamp sampling. Based on the two parallel multi-head quick terminal posts, it is convenient to remove the outlet of the junction box and store the line inside the device to protect the junction box leads and facilitate transportation;

[0067] The display circuit is connected to a display screen and is used to display the current parameters passing through the main circuit and continuously monitor the working status of the online storage battery group.

[0068] In this embodiment, the device has a built-in polarity detection device and an audible and visual alarm system, so that the battery can be replaced without powering off, thereby avoiding battery short circuit and equipment damage caused by human judgment errors, and effectively ensuring the safety of personnel and equipment. The external terminal design leads the crowded internal DC wiring position to the external wiring box, which improves the safety of operations and equipment, shortens the wiring time, improves the operating efficiency, reduces the difficulty and risk of workers operating in live equipment, and improves the safety of operations. The display screen displays current parameters in real time, saving manpower and material resources, and improving work efficiency. In the process of DC system battery maintenance, the operating risks of DC load substation automation and protection equipment are reduced.

[0069] In this embodiment, the junction box further includes:

[0070] The battery monitoring unit is used to collect the monitored battery pack operation data in real time based on the display circuit, and determine the location of the faulty battery based on the battery pack operation data, including:

[0071] The operation data sampling module is used to collect the operation data of the battery pack in real time, including parameters such as voltage, current, temperature, etc., and store the collected battery pack operation data in the database;

[0072] The data sampling module is operated to perform data interaction with the temperature monitoring module, and the temperature of the battery pack is acquired based on the temperature sensor;

[0073] A data processing module is used to process and analyze the collected operating data, evaluate the performance status of the battery, determine whether there is a faulty battery based on the performance evaluation results, and determine the location of the faulty battery based on the fault diagnosis results;

[0074] Troubleshooting results include:

[0075] Single battery failure: The performance evaluation value shows that the voltage, current or temperature index of a battery is far below the normal threshold; the voltage change curve and capacitance change curve show that the battery has obvious abnormal changes; the fault location shows the specific location information of the battery;

[0076] Multiple battery failures: Performance evaluation values ​​show that the indicators of multiple batteries are below normal thresholds; voltage change curves and capacitance change curves show that these batteries have similar abnormal patterns; fault location displays the location information of all affected batteries;

[0077] Unbalanced battery pack: The performance evaluation value shows that there are obvious performance differences in the battery pack; the voltage change curve and the capacitance change curve show that the performance of this battery is significantly lower than that of other batteries. The fault location may show the location information of multiple batteries, indicating that balanced charging is required;

[0078] Battery aging: The performance evaluation value shows that the average performance of the entire battery pack is lower than the specified aging threshold; the voltage change curve and the capacitance change curve show a downward trend in overall performance; this indicates that the entire battery pack needs to be replaced;

[0079] External circuit failure: The voltage change curve and the capacitance change curve show sudden or irregular fluctuations; the fault location indicates external circuit or connection problems;

[0080] Environmental factors: If the performance evaluation value shows that the average temperature exceeds the normal operating range; if the voltage change curve and the capacitance change curve show abnormalities due to temperature changes, it indicates that the environmental control system of the battery pack needs to be checked;

[0081] A battery testing unit, used to test the polarity of the faulty battery before replacing the battery based on the determined location information of the faulty battery, and to feed back the test result to the sound and light alarm system;

[0082] The main pass unit is used to connect the battery to be replaced and the main power circuit based on two DC fast terminals, maintain the main circuit access, and lead the main pass circuit current to the battery monitoring unit for sampling based on the current shunt.

[0083] In this embodiment, by integrating the battery monitoring unit, the operating data of the battery pack can be collected and analyzed in real time, the location of the faulty battery can be determined, and the polarity test can be performed to ensure the safety of the replacement process; the main pass unit maintains the main circuit access and leads the current to the monitoring unit for sampling through the current shunt to achieve continuous monitoring of the battery pack; the maintenance efficiency and safety of the battery pack are effectively improved, the operation and maintenance costs are reduced, and a strong guarantee is provided for the safe and stable operation of the power grid.

[0084] In this embodiment, a temperature sensor is installed in the junction box near the main circuit. The output end of the temperature sensor is connected to the temperature monitoring module. The temperature monitoring module exchanges data with the sound and light alarm system. When the temperature monitoring module detects abnormal temperature, the sound and light alarm system immediately issues an alarm and provides detailed information about the abnormal temperature so that the operator can quickly take corresponding measures.

[0085] The temperature monitoring module is used to obtain the temperature data of the battery pack in real time. It can also predict the temperature distribution and thermal management requirements of the battery pack based on the temperature data of the battery pack, combined with the ambient temperature and the battery charging and discharging status, and perform real-time analysis on the temperature data of the battery pack to prevent overheating or overcooling, thereby extending the service life of the battery and ensuring the stable operation of the system;

[0086] In this embodiment, the data sampling module is run, and further includes:

[0087] The battery pack is left at a preset temperature for a preset time, the temperature difference between the battery pack and the preset temperature is controlled within a target difference allowable range, and the discharge time of the battery pack is set;

[0088] Based on the discharge time, the battery pack is discharged with a constant current until its voltage value reaches the cut-off voltage, and the voltage, current, temperature and other data of the battery during the discharge process are recorded to obtain the effective operation data of the battery pack;

[0089] The real-time collected and monitored operating data of the battery pack is filtered based on the effective operating data of the battery pack to obtain the target operating data of the battery pack, wherein the target operating data corresponds to the operating state of the battery pack one by one.

[0090] In this embodiment, effective operating data of the battery pack is obtained through static standing and constant current discharge, and target operating data is screened, thereby improving the accuracy and reliability of data acquisition and being able to more truly reflect the actual operating status of the battery pack. The static standing process helps to eliminate temporary state changes that may be caused by previous charging and discharging operations, allowing parameters such as the temperature and voltage of the battery pack to gradually stabilize, thereby filtering and screening real-time monitoring data based on the effective operating data of the battery pack, more accurately reflecting the actual operating status of the battery pack, and providing a more reliable data basis for subsequent battery performance evaluation and fault diagnosis, thereby improving the maintenance efficiency of the battery pack and the operating safety of the power grid.

[0091] Specifically, the preset time length is determined by the following steps, including:

[0092] Extract the maximum and minimum tolerable temperatures of the entire battery pack;

[0093] Extracting the theoretical maximum temperature rise amplitude corresponding to the unit time of the battery pack; wherein the value range of the unit time is 2min-7min;

[0094] Obtaining a first time setting coefficient by using the maximum tolerance temperature and the minimum tolerance temperature of the battery pack in combination with a theoretical maximum temperature rise amplitude corresponding to a unit time of the battery pack;

[0095] The first time setting coefficient is obtained by the following formula:

[0096] ;

[0097] Among them, S 01 Indicates the first time setting coefficient; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the battery pack; W dIndicates the theoretical maximum temperature rise of the battery pack per unit time; W g Indicates the ambient temperature corresponding to the working environment of the battery pack; W c Indicates the maximum temperature difference of the working environment of the battery pack within 24 hours; V f Indicates the maximum theoretical voltage variation of the battery pack output voltage; V c Indicates the maximum allowable output voltage variation range that meets the operating requirements during the operation of the battery pack;

[0098] Acquire a second time setting coefficient using temperature information of each battery block included in the battery pack;

[0099] The first time setting coefficient and the second time setting coefficient are used to set a preset time length; wherein the preset time length is obtained by the following formula:

[0100] ;

[0101] Among them, T y Indicates the preset time length; T d Indicates the duration corresponding to a unit of time; S 01 Indicates the first time setting coefficient; S 02 Indicates the second time setting coefficient; INT() means rounding up the value in the brackets.

[0102] The technical effect of the above technical solution is: by extracting the maximum and minimum tolerable temperatures of the battery pack, as well as the theoretical maximum temperature rise corresponding to a unit time, the technical solution can more accurately understand the thermal behavior characteristics of the battery pack. This helps to more accurately predict and control the temperature change of the battery pack in practical applications, thereby avoiding performance degradation or safety accidents caused by overheating or overcooling. By calculating the first time setting coefficient (S01), the technical solution comprehensively considers multiple factors such as the maximum tolerable temperature, the minimum tolerable temperature, the theoretical maximum temperature rise per unit time, the working environment temperature, the maximum temperature difference of the working environment, the maximum theoretical change range of the output voltage, and the maximum allowable output voltage change range that meets the operating requirements of the battery pack. This comprehensive consideration makes the determination of the time setting coefficient more scientific and reasonable, and helps to better balance the battery performance and safety. By using the temperature information of each battery block contained in the battery pack to obtain the second time setting coefficient (S02), the technical solution can take into account the temperature difference between each battery block inside the battery pack. This consideration of individual differences helps to more accurately control the working state of each battery block and prevent the performance and safety of the entire battery pack from being affected by overheating or overcooling of individual battery blocks. By combining the first time setting coefficient and the second time setting coefficient, the technical solution can flexibly set the preset time length (Ty). This flexibility enables the battery management system to dynamically adjust according to the actual working state of the battery pack and external environmental conditions, thereby more effectively protecting the battery pack and extending its service life. By accurately controlling the temperature change and working state of the battery pack, the technical solution helps to reduce the safety risks caused by abnormal conditions such as overheating, overcooling or voltage fluctuations in the battery pack. This is of great significance for ensuring the reliability and safety of application fields such as electric vehicles and energy storage systems.

[0103] In summary, this technical solution achieves efficient and accurate management of the battery pack and improves the performance and safety of the battery pack by comprehensively considering multiple factors, accurately calculating the time setting coefficient, and flexibly setting the preset time length.

[0104] Specifically, obtaining the second time setting coefficient using the temperature information of each battery block included in the battery pack includes:

[0105] Extract the maximum and minimum tolerable temperatures of each battery block contained in the battery pack;

[0106] Extracting a ratio value between the battery capacity of each battery block included in the battery pack and the overall battery capacity of the battery pack;

[0107] Obtaining a battery evaluation coefficient corresponding to each battery block by using the maximum and minimum tolerance temperatures of each battery block combined with a ratio of the battery capacity of each battery block to the overall battery capacity of the battery pack;

[0108] The battery evaluation coefficient corresponding to each battery block is obtained by the following formula:

[0109] ;

[0110] Where K represents the battery evaluation coefficient corresponding to each battery block; B represents the ratio between the battery capacity of each battery block and the overall battery capacity of the battery pack; W zmax and W zmin Respectively represent the maximum and minimum tolerable temperatures of each battery block; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the entire battery pack;

[0111] The battery evaluation coefficients corresponding to each battery block are integrated to obtain a second time setting coefficient, wherein the second time setting coefficient is obtained by the following formula:

[0112] ;

[0113] Among them, S 02 represents the second time setting coefficient; m represents the number of battery blocks contained in the battery pack; K i Indicates the battery evaluation coefficient corresponding to the i-th battery block in the battery pack; K b represents the standard deviation of the battery evaluation coefficient corresponding to m battery blocks; K p Represents the average value of the battery evaluation coefficients corresponding to m battery blocks.

[0114] The technical effect of the above technical solution is: by extracting the maximum and minimum tolerable temperatures of each battery block, and the ratio of the battery capacity of each battery block to the overall battery capacity of the battery pack, the technical solution can more accurately evaluate the working state and performance of each battery block. This individualized evaluation method helps to discover performance bottlenecks or safety hazards that may exist in the battery pack. By calculating the battery evaluation coefficient (K) corresponding to each battery block, the technical solution can comprehensively consider multiple factors such as the temperature tolerance range and capacity ratio of the battery block to obtain a comprehensive evaluation index. This index can more intuitively reflect the relative performance and importance of each battery block in the battery pack. By calculating the standard deviation (Kb) and average value (Kp) of the battery evaluation coefficients corresponding to m battery blocks, the technical solution can more comprehensively understand the performance differences between the battery blocks within the battery pack. This difference consideration helps to formulate a more accurate battery management strategy to optimize the overall performance of the battery pack. Combined with the battery evaluation coefficient of each battery block, by calculating the second time setting coefficient (S02), the technical solution can more flexibly adjust the management strategy of the battery pack. This coefficient can reflect the performance differences and overall status of the battery blocks within the battery pack, thereby helping managers better control the operation and maintenance of the battery pack. By finely managing and optimizing each battery block, this technical solution can reduce the risk of damage to the performance of the entire battery pack due to performance degradation or failure of individual battery blocks. This helps to improve the safety and reliability of the battery pack and extend its service life. Because the technical solution can comprehensively consider the overall performance and individual differences of the battery pack, it can better adapt to different working environments and load conditions. This helps to improve the adaptability and flexibility of the battery pack, enabling it to be more widely used in various fields.

[0115] In summary, this technical solution achieves fine management and optimization of each battery block in the battery pack by introducing the battery evaluation coefficient and the second time setting coefficient. This helps to improve the performance and safety of the battery pack, extend its service life, and enhance its adaptability and flexibility.

[0116] In this embodiment, the data processing module is specifically:

[0117] Performing statistical analysis on the target operating data, calculating the average voltage, average current and average temperature of each battery in the battery pack, indicating the average levels of voltage, current and temperature of the battery over a period of time;

[0118] Determine the target values ​​of the voltage operation data group and the capacitance operation data group of each battery, and draw the voltage change curve and the capacitance change curve of the voltage operation data group and the capacitance operation data group of each battery based on the target values, showing the change trend of the battery voltage and capacitance over time;

[0119] Construct a battery performance degradation evaluation model, analyze the voltage change trend, current change trend and temperature change trend of each battery based on the battery performance degradation evaluation model, and obtain the performance evaluation value of each battery;

[0120] Based on the comparison between the performance evaluation value and the preset threshold, it is determined whether each storage battery is abnormal, and the storage battery with the abnormality is located based on the determination result, and the preset threshold includes a preset normal threshold and a fault threshold;

[0121] The location information of the faulty battery is displayed on the display.

[0122] Among them, each battery is evaluated based on the battery performance attenuation evaluation model, and the evaluation results include:

[0123] Normal state: The average values ​​of voltage, current and temperature are within the preset normal range; the voltage change curve and capacitance change curve are stable without abnormal fluctuations;

[0124] Performance degradation: The voltage average value is slightly lower than the normal range, but not reaching the fault level; the voltage change curve and the capacitance change curve show slight fluctuations;

[0125] Maintenance required: The average voltage is significantly lower than the normal range, but the battery can still work; the voltage change curve and the capacitance change curve show large fluctuations;

[0126] Impending failure: The average voltage approaches or reaches the cut-off voltage; the voltage change curve and the capacitance change curve show a rapid downward trend;

[0127] Based on the quantification of each numerical weight, the performance evaluation value of each battery is obtained. If the performance evaluation value is higher than the preset normal threshold, it indicates a normal state. If the performance evaluation value is close to but not lower than the preset normal threshold, it indicates performance degradation. If the performance evaluation value is lower than the normal threshold but higher than the fault threshold, it indicates that maintenance is required. If the performance evaluation value is close to or reaches the fault threshold, it indicates an impending fault.

[0128] In this embodiment, the data processing module uses statistical analysis, curve drawing, performance degradation evaluation model and other methods to conduct in-depth analysis on the operating data of the battery pack. Based on the battery voltage data set and capacitance data set recorded over a period of time, the changes in voltage and capacitance are analyzed. A battery performance degradation model is constructed based on historical data and the physical and chemical properties of the battery. The performance status of each battery is accurately evaluated, and abnormal batteries are identified. The specific location of the abnormal battery in the battery pack is determined. By displaying the location information of the faulty battery on the display screen, the operation and maintenance personnel can quickly locate and replace the faulty battery, effectively extending the service life of the battery pack, reducing maintenance costs, and improving the reliability of the power grid.

[0129] In this embodiment, the battery testing unit specifically includes the following steps:

[0130] Based on the location information of the faulty battery, the batteries before and after it are marked to facilitate identification and operation during the test process, and the positive and negative electrodes of the faulty battery are tested for the same polarity based on the test loop, wherein the test loop and the faulty battery form a closed loop;

[0131] If the polarity of the wiring in the test loop is reversed, the sound and light alarm system is immediately triggered, and the sound and light alarm system indicates to the operator that the current wiring polarity is wrong based on the sound and light signals, thereby ensuring that the operator can correct the wiring error in time to avoid damage to the battery pack or the operator;

[0132] If the current wiring polarity is correct, disconnect the test circuit from the faulty battery, connect the positive and negative terminals of the main circuit to the positive and negative terminals of the faulty battery, jumper the faulty battery from the front-end circuit, disconnect the main circuit from the replacement battery, and replace it with another battery that is working normally, ensuring uninterrupted power maintenance of the battery.

[0133] In this embodiment, the battery test unit performs a trial connection test and sound and light alarm. During the test, the wiring terminal of the test loop is connected to the positive pole of the faulty battery, and the negative pole is connected to the negative pole to ensure the polarity of the wiring is consistent, thereby realizing polarity detection of the faulty battery, avoiding battery short circuit and equipment damage caused by wiring errors, and ensuring the safety of personnel and equipment. It has a high degree of automation and is easy to operate, which reduces the labor intensity of operation and maintenance personnel and improves work efficiency. In the power supply system of the substation, uninterrupted power maintenance can ensure uninterrupted power supply, avoid business losses caused by power problems, reduce downtime maintenance costs, and maintain the best working condition of the battery pack, which helps to optimize energy use and reduce unnecessary energy waste.

[0134] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A non-stop replacement device for backward batteries in a DC battery pack of a substation, including a junction box, characterized in that: The junction box is provided with a set of test circuits, a set of main circuits, two parallel multi-head fast terminal blocks and a display circuit. An overcurrent protection device is connected in series to the main circuit, and the output port of the overcurrent protection device is connected to the sound and light alarm system in the junction box; The junction box further comprises: A battery monitoring unit, used to collect the monitored battery pack operation data in real time based on the display circuit, and determine the location of the faulty battery based on the battery pack operation data; A battery testing unit, used to test the polarity of the faulty battery before replacing the battery based on the determined location information of the faulty battery, and to feed back the test result to the sound and light alarm system; The main pass unit is used to connect the battery to be replaced and the main power circuit based on two DC fast terminals, maintain the main circuit access, and lead the main pass circuit current to the battery monitoring unit for sampling based on the current shunt; The battery monitoring unit comprises: An operation data sampling module is used to collect the operation data of the battery pack in real time and store the collected operation data of the battery pack in a database; A data processing module is used to process and analyze the collected operating data, evaluate the performance status of the battery, determine whether there is a faulty battery based on the performance evaluation results, and determine the location of the faulty battery based on the fault diagnosis results; Running the data sampling module also includes: The battery pack is left at a preset temperature for a preset time, the temperature difference between the battery pack and the preset temperature is controlled within a target difference allowable range, and the discharge time of the battery pack is set; Based on the discharge time, the battery pack is discharged with a constant current until its voltage value reaches a cut-off voltage, thereby obtaining effective operation data of the battery pack; Based on the effective operation data of the battery pack, the operation data of the battery pack collected and monitored in real time is filtered to obtain the target operation data of the battery pack, wherein the target operation data corresponds to the operation state of the battery pack one by one; The preset time length is determined by the following steps, including: Extract the maximum and minimum tolerable temperatures of the entire battery pack; Extracting the theoretical maximum temperature rise amplitude corresponding to the unit time of the battery pack; wherein the value range of the unit time is 2min-7min; Obtaining a first time setting coefficient by using the maximum tolerance temperature and the minimum tolerance temperature of the battery pack in combination with a theoretical maximum temperature rise amplitude corresponding to a unit time of the battery pack; The first time setting coefficient is obtained by the following formula: Among them, S 01 Indicates the first time setting coefficient; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the battery pack; W d Indicates the theoretical maximum temperature rise of the battery pack per unit time; W g Indicates the ambient temperature corresponding to the working environment of the battery pack; W c Indicates the maximum temperature difference of the working environment of the battery pack within 24 hours; V f Indicates the maximum theoretical voltage variation of the battery pack output voltage; V c Indicates the maximum allowable output voltage variation range that meets the operating requirements during the operation of the battery pack; Acquire a second time setting coefficient using temperature information of each battery block included in the battery pack; The first time setting coefficient and the second time setting coefficient are used to set a preset time length; wherein the preset time length is obtained by the following formula: T y =[1+INT(S 01 +S 02 )]·T d Among them, T y Indicates the preset time length; T d Indicates the duration corresponding to a unit of time; S 01 Indicates the first time setting coefficient; S 02 Indicates the second time setting coefficient; INT() means rounding up the value in the brackets; The second time setting coefficient is obtained by using the temperature information of each battery block included in the battery pack, including: Extract the maximum and minimum tolerable temperatures of each battery block contained in the battery pack; Extracting a ratio value between the battery capacity of each battery block included in the battery pack and the overall battery capacity of the battery pack; Obtaining a battery evaluation coefficient corresponding to each battery block by using the maximum and minimum tolerance temperatures of each battery block combined with a ratio of the battery capacity of each battery block to the overall battery capacity of the battery pack; The battery evaluation coefficient corresponding to each battery block is obtained by the following formula: Where K represents the battery evaluation coefficient corresponding to each battery block; B represents the ratio between the battery capacity of each battery block and the overall battery capacity of the battery pack; W zmax and W zmin Respectively represent the maximum and minimum tolerable temperatures of each battery block; W max and W min Respectively represent the maximum and minimum tolerable temperatures of the entire battery pack; The battery evaluation coefficients corresponding to each battery block are integrated to obtain a second time setting coefficient, wherein the second time setting coefficient is obtained by the following formula: Among them, S 02 represents the second time setting coefficient; m represents the number of battery blocks contained in the battery pack; K i Indicates the battery evaluation coefficient corresponding to the i-th battery block in the battery pack; K b represents the standard deviation of the battery evaluation coefficient corresponding to m battery blocks; K p Represents the average value of the battery evaluation coefficients corresponding to m battery blocks.

2. The device for replacing lagging batteries in a DC battery pack of a substation without power outage as claimed in claim 1, characterized in that: A temperature sensor is installed in the junction box near the main circuit. The output end of the temperature sensor is connected to the temperature monitoring module. The temperature monitoring module interacts with the sound and light alarm system. When the temperature monitoring module detects abnormal temperature, an alarm is sounded through the sound and light alarm system.

3. The device for replacing lagging batteries of a DC battery pack in a substation without power outage as claimed in claim 2, characterized in that: The temperature monitoring module is used to obtain the temperature data of the battery pack in real time, and predict the temperature distribution and thermal management requirements of the battery pack based on the temperature data of the battery pack in combination with the ambient temperature and the battery charging and discharging status.

4. The device for replacing lagging batteries in a DC storage battery pack of a substation without power outage as claimed in claim 3, characterized in that: The operation data sampling module exchanges data with the temperature monitoring module, and obtains the temperature of the battery pack based on the temperature sensor.

5. The device for replacing lagging batteries in a DC battery pack of a substation without power outage as claimed in claim 4, characterized in that: Data processing module, specifically: Performing statistical analysis on the target operating data to calculate the average voltage, average current and average temperature of each battery in the battery pack; Determine target values ​​of the voltage operation data group and the capacitance operation data group of each storage battery, and draw voltage change curves and capacitance change curves of the voltage operation data group and the capacitance operation data group of each storage battery based on the target values; Construct a battery performance degradation evaluation model, analyze the voltage change trend, current change trend and temperature change trend of each battery based on the battery performance degradation evaluation model, and obtain the performance evaluation value of each battery; Based on the comparison between the performance evaluation value and the preset threshold, it is determined whether each battery is abnormal, and the abnormal battery is located based on the determination result; The location information of the faulty battery is displayed on the display.

6. The device for replacing lagging batteries in a DC battery pack of a substation without power outage as claimed in claim 5, characterized in that: The battery testing unit specifically comprises the following steps: Marking the front and rear batteries of the faulty battery based on the location information thereof, and conducting a same-polarity test connection between the positive and negative electrodes of the faulty battery based on a test circuit, wherein the test circuit and the faulty battery form a closed circuit; If the polarity of the wiring in the test loop is reversed, the sound and light alarm system is immediately triggered, and the sound and light alarm system indicates to the operator that the current wiring polarity is wrong based on sound and light signals; If the current wiring polarity is correct, disconnect the test circuit from the faulty battery, connect the positive and negative terminals of the main pass circuit to the positive and negative terminals of the faulty battery, jumper the faulty battery from the front-end circuit, and disconnect the main pass circuit from the replacement battery.

Images