A method and device for operation and maintenance monitoring of a direct current charging pile

Abstract

The application provides a DC charging pile operation and maintenance monitoring method and device, comprising: obtaining the output current and output power provided by a target DC charging pile to a vehicle battery during charging; based on the output current and output power, estimating the heat dissipation efficiency of the current target DC charging pile in dissipating heat to the outside; determining whether the estimated heat dissipation efficiency meets the heat dissipation requirement, and when the estimated heat dissipation efficiency does not meet the heat dissipation requirement, sending a notification to an operation and maintenance terminal associated with the target DC charging pile indicating that the target DC charging pile needs operation and maintenance. In this way, the DC charging pile that needs maintenance can be maintained in time, improving the efficiency and accuracy of operating and maintaining the DC charging pile, avoiding over-maintenance of unnecessary maintenance DC charging piles, thereby improving the operation and maintenance manpower efficiency and reducing the operation and maintenance manpower investment of the charging pile operator.

Description

Technical Field

[0001] This application relates to the field of charging pile technology, and in particular to a method and device for operation and maintenance monitoring of DC charging piles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the number of DC charging piles providing power to new energy vehicles is also growing exponentially. DC charging piles generate a large amount of heat when charging new energy vehicles, making a cooling system essential. However, as DC charging piles are used over time, various problems can arise that affect the cooling efficiency of the system, thus impacting the performance of the charging pile. Therefore, maintenance and upkeep of DC charging piles are necessary.

[0003] Currently, existing operation and maintenance methods for DC charging piles mainly include scheduled maintenance and random inspection. Scheduled maintenance requires dedicated personnel to regularly maintain and inspect specific DC charging piles. However, with the rapid increase in the number of DC charging piles, simply relying on scheduled maintenance not only fails to detect charging pile faults promptly but also wastes human resources on maintaining fault-free charging piles, leading to low maintenance efficiency. Random inspection, on the other hand, requires maintenance personnel to randomly select DC charging piles for maintenance. This method is highly random and cannot scientifically and rationally manage the operation and maintenance of DC charging piles, easily leading to safety risks due to untimely maintenance. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a method and device for monitoring the operation and maintenance of DC charging piles. This method and device can estimate the heat dissipation efficiency of the target DC charging pile based on the output current and output power provided by the target DC charging pile to the vehicle battery during charging. It then determines whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the requirements, a notification requiring maintenance is sent to the relevant maintenance terminal. This approach allows for timely maintenance of DC charging piles that require upkeep, improving the efficiency and accuracy of DC charging pile maintenance, avoiding over-maintenance of unnecessary DC charging piles, thereby improving the efficiency of maintenance manpower and reducing the manpower investment required by charging pile operators.

[0005] This application provides a method for monitoring the operation and maintenance of DC charging piles. The method is applied to a charging pile operation and maintenance system, which includes multiple independently configured DC charging piles. The method includes:

[0006] The system acquires the output current and output power supplied by the target DC charging pile to the vehicle battery during the charging process; the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current demanded by the target DC charging pile as indicated by the vehicle-side communication protocol message; the output power is obtained by detecting the actual power output by the target DC charging pile or by calculating the output current.

[0007] Based on the output current and output power, the heat dissipation efficiency of the target DC charging pile is estimated.

[0008] Determine whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the heat dissipation requirements, send a notification to the maintenance terminal associated with the target DC charging pile indicating that the target DC charging pile needs maintenance.

[0009] Furthermore, the step of estimating the heat dissipation efficiency of the current target DC charging pile based on the output current and output power includes:

[0010] Based on the output current and output power, a pre-fitted specific relationship is used to estimate the heat dissipation efficiency of the current target DC charging pile; the heat dissipation efficiency is a certain function relationship with the nth power of the output current and the output power, respectively.

[0011] Furthermore, the specific relation is obtained by fitting in the following way:

[0012] For a first DC charging pile of the same model as the target DC charging pile, historical charging data of the first DC charging pile at different times under different charging orders within at least one predetermined time period is obtained; the historical charging data includes output current, output power, air inlet temperature and air outlet temperature; the air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile; the air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile; the aging degree of the first DC charging pile is less than or equal to the aging threshold.

[0013] For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point.

[0014] Using the pre-defined factory parameter mapping relationship of the DC charging pile, the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment is determined.

[0015] By fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time, a specific relationship is obtained.

[0016] Furthermore, the step of fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time point to obtain a specific relationship includes:

[0017] For each order, based on the output current, output power, and heat dissipation efficiency at each moment under that order, calculate the root mean square of the output current, output power, and heat dissipation efficiency for that order respectively;

[0018] By fitting and calibrating the data using the root mean square of the output current, output power, and heat dissipation efficiency corresponding to each order, a specific relationship is obtained.

[0019] Furthermore, the specific relation includes:

[0020]

[0021] Where p represents the order; t represents the time. This represents the heat dissipation efficiency at time t under order p; This represents the output current at time t under order p; This represents the output power at time t under order p; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer representing the order of the specific relation obtained by fitting.

[0022] This application embodiment also provides an operation and maintenance monitoring device for DC charging piles. The operation and maintenance monitoring device is applied to a charging pile operation and maintenance system, which includes multiple independently installed DC charging piles. The operation and maintenance monitoring device includes:

[0023] The acquisition module is used to acquire the output current and output power provided by the target DC charging pile to the vehicle battery during the charging process; the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current required to be output to the vehicle battery according to the vehicle-side communication protocol message; the output power is obtained by detecting the actual power output by the target DC charging pile or calculated based on the output current;

[0024] The estimation module is used to estimate the heat dissipation efficiency of the current target DC charging pile's outward heat dissipation based on the output current and output power.

[0025] The sending module is used to determine whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the heat dissipation requirements, it sends a notification to the maintenance terminal associated with the target DC charging pile, indicating that the target DC charging pile needs maintenance.

[0026] Furthermore, when the estimation module is used to estimate the heat dissipation efficiency of the current target DC charging pile's outward heat dissipation based on the output current and output power, the estimation module is used to:

[0027] Based on the output current and output power, a pre-fitted specific relationship is used to estimate the heat dissipation efficiency of the current target DC charging pile; the heat dissipation efficiency is a certain function relationship with the nth power of the output current and the output power, respectively.

[0028] Furthermore, the estimation module is used to fit the specific relational expression in the following manner:

[0029] For a first DC charging pile of the same model as the target DC charging pile, historical charging data of the first DC charging pile at different times under different charging orders within at least one predetermined time period is obtained; the historical charging data includes output current, output power, air inlet temperature and air outlet temperature; the air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile; the air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile; the aging degree of the first DC charging pile is less than or equal to the aging threshold.

[0030] For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point.

[0031] Using the pre-defined factory parameter mapping relationship of the DC charging pile, the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment is determined.

[0032] By fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time, a specific relationship is obtained.

[0033] Furthermore, when the estimation module is used to fit and calibrate the output current, output power, and heat dissipation efficiency corresponding to each order at each time point to obtain a specific relationship, the estimation module is used to:

[0034] For each order, based on the output current, output power, and heat dissipation efficiency at each moment under that order, calculate the root mean square of the output current, output power, and heat dissipation efficiency for that order respectively;

[0035] By fitting and calibrating the data using the root mean square of the output current, output power, and heat dissipation efficiency corresponding to each order, a specific relationship is obtained.

[0036] Furthermore, the specific relation includes:

[0037]

[0038] Where p represents the order; t represents the time. This represents the heat dissipation efficiency at time t under order p; This represents the output current at time t under order p; This represents the output power at time t under order p; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer representing the order of the specific relation obtained by fitting.

[0039] This application also provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the operation and maintenance monitoring method for a DC charging pile described above are performed.

[0040] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the operation and maintenance monitoring method for a DC charging pile as described above.

[0041] This application provides a method and device for monitoring the operation and maintenance of a DC charging pile. The method acquires the output current and output power provided by the target DC charging pile to the vehicle battery during charging. The output current is obtained by detecting the actual current output by the target DC charging pile, which is the current demand indicated by the vehicle-side communication protocol message. The output power is obtained by detecting the actual power output by the target DC charging pile or by calculating based on the output current. Based on the output current and output power, the method estimates the heat dissipation efficiency of the target DC charging pile. It then determines whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the requirements, a notification indicating that the target DC charging pile needs maintenance is sent to the operation and maintenance terminal associated with the target DC charging pile.

[0042] This allows for the estimation of the target DC charging pile's heat dissipation efficiency based on the output current and power supplied to the vehicle battery during charging. It then determines whether the estimated efficiency meets the heat dissipation requirements. If the estimated efficiency fails to meet the requirements, a notification requesting maintenance is sent to the relevant maintenance terminals. This method enables timely maintenance of DC charging piles requiring upkeep, improving the efficiency and accuracy of DC charging pile maintenance. It avoids over-maintenance of unnecessary DC charging piles, thereby increasing the efficiency of maintenance manpower and reducing the manpower required by charging pile operators.

[0043] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This paper shows a schematic diagram of the structure of a DC charging pile provided in an embodiment of this application;

[0046] Figure 2 A flowchart of an operation and maintenance monitoring method for a DC charging pile provided in an embodiment of this application is shown;

[0047] Figure 3 This paper shows a schematic diagram of the operation and maintenance monitoring device for a DC charging pile provided in an embodiment of this application;

[0048] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0050] The methods, apparatus, electronic devices, or computer-readable storage media described in this application can be applied to any scenario where a DC charging pile charges a vehicle. This application does not limit the specific application scenario. Any scheme using the operation and maintenance monitoring method and operation and maintenance monitoring device of the DC charging pile provided in this application is within the protection scope of this application.

[0051] It is worth noting that prior to this application, with the rapid development of the new energy vehicle industry, the number of DC charging piles providing power to new energy vehicles has also grown exponentially. DC charging piles generate a large amount of heat when charging new energy vehicles, making a cooling system essential. However, as the usage time of DC charging piles increases, various problems can arise that affect the cooling efficiency of the cooling system, thereby impacting the performance of the DC charging pile. Therefore, maintenance of DC charging piles is necessary.

[0052] Currently, existing operation and maintenance methods for DC charging piles mainly include scheduled maintenance and random inspection. Scheduled maintenance requires dedicated personnel to regularly maintain and inspect specific DC charging piles. However, with the rapid increase in the number of DC charging piles, simply relying on scheduled maintenance not only fails to detect charging pile faults promptly but also wastes human resources on maintaining fault-free charging piles, leading to low maintenance efficiency. Random inspection, on the other hand, requires maintenance personnel to randomly select DC charging piles for maintenance. This method is highly random and cannot scientifically and rationally manage the operation and maintenance of DC charging piles, easily leading to safety risks due to untimely maintenance.

[0053] To address the aforementioned issues, this application provides a method and device for monitoring the operation and maintenance of DC charging piles. Based on the output current and power supplied by the target DC charging pile to the vehicle battery during charging, the method estimates the heat dissipation efficiency of the target DC charging pile, determines whether the estimated heat dissipation efficiency meets the heat dissipation requirements, and sends a notification requiring maintenance to the relevant maintenance terminal when the estimated heat dissipation efficiency does not meet the requirements. This approach allows for timely maintenance of DC charging piles requiring upkeep, improving the efficiency and accuracy of DC charging pile maintenance, avoiding over-maintenance of unnecessary DC charging piles, thereby increasing the efficiency of maintenance manpower and reducing the manpower investment required by charging pile operators.

[0054] Please see Figure 1 , Figure 1 This is a schematic diagram of a DC charging pile provided in an embodiment of this application. Figure 1 As shown in the figure, the DC charging pile 100 provided in this application embodiment has an air inlet door 110 and an air outlet door 120 on its cabinet shell. The air inlet door 110 is provided with an air inlet, and the air outlet door 120 is provided with an air outlet.

[0055] During charging, a significant amount of heat is generated inside the cabinet of a DC charging station. To ensure the safety and performance of the DC charging station, a cooling system, such as multiple cooling fans, is typically installed inside to ventilate and dissipate heat. Figure 1As shown, when the DC charging pile 100 is running, the heat dissipation system inside the DC charging pile 100 is activated, which can dissipate the heat generated by the DC charging pile 100 through the air outlet provided on the air outlet 120. Specifically, cold air from outside the DC charging pile 100 enters through the air inlet provided on the air inlet 110, and hot air inside the DC charging pile 100 is discharged through the air outlet provided on the air outlet 120, thus forming a circulating airflow, which allows the DC charging pile to dissipate heat outward.

[0056] Below, we will combine the above... Figure 1 The content described in the DC charging pile 100 shown provides a detailed explanation of the operation and maintenance monitoring method provided in the embodiments of this application.

[0057] Figure 2 This document illustrates a flowchart of an operation and maintenance monitoring method for a DC charging pile according to an embodiment of this application. It should be noted that the operation and maintenance monitoring method proposed in this application can be applied to a charging pile operation and maintenance system, which may include multiple independently configured DC charging piles. Specifically, the operation and maintenance monitoring method provided in this application embodiment can be implemented by a device with operation and maintenance monitoring functions within the charging pile operation and maintenance system. For example, the operation and maintenance monitoring method can be implemented by a specific device with operation and maintenance monitoring functions included in the charging pile operation and maintenance system. For instance, the specific device may be a charging pile device with detection and processing functions, such as a DC charging pile included in the charging pile operation and maintenance system. Alternatively, the operation and maintenance monitoring method can be implemented entirely through a computer program. For example, the operation and maintenance monitoring method can be executed by an application for operation and maintenance monitoring installed in a charging pile monitoring cloud platform that is communicatively connected to each DC charging pile within the charging pile operation and maintenance system, or by a functional program implemented in the operating system of the charging pile cloud platform.

[0058] like Figure 2 As shown in the figure, the specific execution process of the operation and maintenance monitoring method provided in this application embodiment is as follows:

[0059] S101. Obtain the output current and output power provided by the target DC charging pile to the vehicle battery during the charging process.

[0060] It should be noted that the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current required to be output to the vehicle battery according to the vehicle-side communication protocol message; and the output power is obtained by detecting the actual power output by the target DC charging pile or calculated based on the output current. For example, after detecting the output current, the product of the output current and the output voltage can be determined as the output current.

[0061] Specifically, after the vehicle battery is connected to the target DC charging station, it will communicate with the target DC charging station by sending vehicle-to-vehicle communication protocol messages through the vehicle-to-vehicle communication protocol (e.g., GB / T 27930-2015 BMS communication protocol) to complete the charging process.

[0062] For example, after a vehicle battery establishes a connection with a DC charging station, during information exchange, the BMS (Battery Management System) reads the vehicle battery's State of Charge (SOC) and temperature to determine the battery's required current. This required current is then sent to the DC charging station via a vehicle-to-charger communication protocol message. The DC charging station uses this required current as feedback to adjust its output voltage to ensure the current output matches the required current. For instance, if the DC charging station's current output current is 50A, and the BMS reports a required current of 200A, the DC charging station will increase its output voltage through PI (Position Reduction) regulation, ensuring that the output current supplied to the vehicle battery reaches 200A within a certain timeframe. It should be noted that within the vehicle battery's voltage tolerance range, a higher output voltage results in a higher charging current. Consequently, a higher output current leads to higher output power. It should also be understood that due to factors such as the charging stage and state of charge of the vehicle battery, the required current and power change dynamically at different times during the charging process.

[0063] However, during vehicle charging, due to factors such as heating the battery, the heat generated by the DC charging station increases significantly with the increase in charging power. If the temperature is too high, the DC charging station will reduce the output current and output power, resulting in the actual current output by the DC charging station being slightly less than the current required by the vehicle.

[0064] S102. Based on the output current and output power, estimate the heat dissipation efficiency of the current target DC charging pile to dissipate heat outward.

[0065] Specifically, both output current and output power are related to heat dissipation efficiency. This is because output current and output power can generate heat loss during the charging process (this heat loss can be estimated by the power conversion efficiency of the DC charging pile), and this heat loss is related to the heat dissipation efficiency of the DC charging pile equipment.

[0066] On the other hand, due to different output currents and output power, the speed of the cooling fan (adjustable speed fan) included in the heat dissipation system of the DC charging pile will also be different. The fan speed is positively correlated with the output power. However, if the dustproof cotton of the charging pile is blocked, the heat dissipation effect of the charging pile will decrease, thereby affecting the heat dissipation capacity of the DC charging pile to dissipate heat. Therefore, this paper estimates the heat dissipation efficiency of the target charging pile to dissipate heat to the outside based on the actual operating indicators such as the output current, output voltage, and output power of the DC charging pile, combined with the output caliber of the charging pile equipment, in order to determine whether there is a certain degree of blockage in the dustproof net of the charging pile.

[0067] As an example, the heat dissipation efficiency of the current target DC charging pile can be estimated using a pre-fitted specific relationship based on the output current and output power.

[0068] Here, the heat dissipation efficiency is functionally related to the nth power of the output current and output power, for example, this functional relationship can be positively correlated. Positive correlation means that the variables change in the same direction; that is, when the independent variable changes from small to large, the dependent variable also changes from small to large. Accordingly, in the specific relationship, when the output current and output power increase, and the nth power of the output current and output power increases, the heat dissipation efficiency increases accordingly. In other words, the specific relationship can characterize the relationship between the output current, output power, and heat dissipation efficiency of a DC charging pile of the same model as the target DC charging pile. Therefore, in this step, as an example, in specific implementation, the obtained output current and output power can be directly substituted into the specific relationship, and the heat dissipation efficiency of the current target DC charging pile can be estimated through mathematical calculations.

[0069] The following will explain in detail how to fit the specific relational expression using concrete steps:

[0070] The first step is to acquire historical charging data for the first DC charging pile of the same model as the target DC charging pile under a predetermined usage environment, at different times under different charging orders within at least one predetermined time period after the first DC charging pile leaves the factory. The historical charging data may include output current, output power, air inlet temperature and air outlet temperature. The air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile. The air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile.

[0071] It should be noted that, as mentioned above, based on the relationship between the output current, output power, and heat dissipation efficiency of a DC charging pile, a relational formula reflecting the relationship among these three factors can be pre-constructed. Therefore, a fitting method can be used to construct this formula. Here, since the parameter performance of DC charging piles of the same model is relatively consistent, the fitted specific relationship will better match the charging performance of the DC charging pile, thereby making the heat dissipation efficiency of the target DC charging pile estimated using the specific relationship more accurate. Therefore, historical charging data of a DC charging pile of a certain model under a certain usage environment can be used to fit a specific relationship representing the usability of that model of DC charging pile under that usage environment.

[0072] Specifically, it should be noted that in this application, the first DC charging pile is preferably a brand new DC charging pile with the expected charging capabilities. As an example, the aging level of a brand new DC charging pile can be 0. Alternatively, the aging level of the DC charging pile can be set using any existing method. Accordingly, historical charging data at different times under different charging orders within at least one predetermined time period can be obtained when the aging level of the first DC charging pile is less than or equal to the aging threshold. Here, the aging threshold can be set based on actual conditions, and this application does not impose any limitations on it.

[0073] Generally, with the use of DC charging piles, their overall performance and functionality are affected by factors such as the natural environment of the installation location and the performance of the components. To ensure the accuracy of specific relationships, historical charging data from different charging orders at different times within at least one predetermined time period after the first DC charging pile leaves the factory can be collected under a predetermined usage environment. Here, the predetermined usage environment can be obtained based on experience or set according to actual conditions. For example, the predetermined usage environment may be an environment with an average temperature range of 15°C to 20°C or an environment with an average temperature range of 23°C to 29°C. Furthermore, at least one predetermined time period can be any time period after the first DC charging pile leaves the factory. Since the overall performance and functionality of the DC charging pile are affected over time as described above, it is preferable to select different stages of the entire lifespan of the first DC charging pile after it leaves the factory. For example, if the estimated lifespan of the first DC charging pile is 5 years, a representative time period within those 5 years can be selected that reflects the performance of the first DC charging pile. For example, the predetermined time period could be after the first DC charging pile has just been put into use, after half a month of operation, after one month of operation, or after six months of operation, or it could be any period of the life cycle of the first DC charging pile. This application does not make any restrictions here.

[0074] Here, statistics are compiled from the moment the first DC charging pile leaves the factory and is put into use. This is because the new DC charging piles are designed to minimize issues such as clogged dust filters, dust settling, lint buildup, and malfunctioning heat dissipation components. If the first DC charging pile can complete charging orders under these conditions, it indicates that its charging function is normal and without faults. Therefore, fitting a specific relationship using historical charging data from the new DC charging piles avoids the influence of redundant variables and special cases on heat dissipation efficiency, making the fitted relationship more standardized and universal.

[0075] On the other hand, historical charging data (output current, output power, inlet temperature, and outlet temperature) can be collected by relevant modules equipped with acquisition and / or calculation functions installed on the first DC charging pile. For example, the relevant modules included in the controller of the DC charging pile can obtain the current inlet and outlet temperatures of the DC charging pile collected by the temperature acquisition device. As an example, the temperature acquisition device can be installed at the inlet and outlet of the DC charging pile respectively, or the temperature acquisition device can be installed at both ends of the power rectifier module of the DC charging pile. Here, the temperature acquisition device can be an independently installed temperature sensor or thermocouple.

[0076] In addition, the relevant modules included in the controller of the DC charging pile can also read the output current and / or output power provided by the DC charging pile to the vehicle battery in real time according to a predetermined communication protocol.

[0077] Step 2: For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile under the corresponding output current and output power at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point.

[0078] Step 3: Using the pre-defined factory parameter mapping relationship of the DC charging pile, determine the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment.

[0079] It should be noted that the predetermined factory parameter mapping relationship for DC charging piles pre-calibrates the heat dissipation efficiency of a DC charging pile (of the same model as the first DC charging pile) using SOP process, when providing different output currents and output power to the vehicle battery, at different outlet and inlet temperatures. Accordingly, the predetermined factory parameter mapping relationship can indicate the correspondence between output current, output power, heat dissipation temperature rise, and heat dissipation efficiency.

[0080] Accordingly, after determining the output current, output power, and heat dissipation temperature rise at a certain moment, the heat dissipation efficiency corresponding to the output current, output power, and heat dissipation temperature rise at that moment can be obtained by consulting the predetermined factory parameter mapping relationship of the DC charging pile.

[0081] Here, the predetermined factory parameter mapping relationship of DC charging piles can be obtained by calibrating the output current and / or output power, inlet temperature, outlet temperature, and heat dissipation efficiency of DC charging piles under different loads and experimental environments through experiments. This data is then integrated using specific rules to obtain a reference relationship suitable for all DC charging piles of the same model. During the experiment, the output current and / or output power can be determined using electricity meter readings. It should be noted that experiments can be conducted from two dimensions, choosing only one. For example, when only the output current is measured, the output power can be obtained by multiplying the output current and output voltage. Alternatively, both output current and output power can be obtained simultaneously from another dimension.

[0082] Step 4: After obtaining the historical charging data corresponding to each order at each time, the output current, output power and heat dissipation efficiency corresponding to each order at each time can be used for fitting and calibration to obtain a specific relationship.

[0083] Specifically, any existing method can be used to fit a specific relationship characterizing the relationship between output current, output power and heat dissipation efficiency based on the acquired data.

[0084] As an example, during fitting, a specific relationship can be set between the output current and output power and the heat dissipation efficiency. By using the output current, output power and heat dissipation efficiency corresponding to each order at each time for fitting calibration, the values ​​of each undetermined coefficient in the specific relationship can be fitted, thereby fitting the above specific relationship.

[0085] In practice, data analysis can be performed using computer software, and the polynomial can be fitted. Specifically, the degree of the polynomial can be adjusted, from higher-degree polynomials to lower-degree polynomials or from lower-degree polynomials to higher-degree polynomials, to gradually fit a specific relationship.

[0086] For example, the following formula (1) can be established in advance as a specific relation:

[0087]

[0088] Where p represents the order; t represents the time. This represents the heat dissipation efficiency at time t under order p; This represents the output current at time t under order p; This represents the output power at time t under order p; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer representing the order of the specific relation obtained by fitting.

[0089] In practical implementation, the output current, output power and heat dissipation efficiency corresponding to each order at each time can be substituted into the fitting formula (i.e., formula (1)) to fit the coefficients a, b and c of the specific relationship, thereby obtaining the specific relationship that can truly characterize the relationship between output current, output power and heat dissipation efficiency.

[0090] In addition, as another example, the effective value of output current (i.e., the root mean square value of output current), effective value of output power (i.e., the effective value of output power), and effective value of heat dissipation efficiency (i.e., the effective value of heat dissipation efficiency) corresponding to each order can be directly obtained, and a specific relationship can be fitted using the effective values ​​of output current, output power, and heat dissipation efficiency corresponding to each order in multiple orders.

[0091] Specifically, firstly, for each order, based on the output current, output power, and heat dissipation efficiency at each time point under that order, the root mean square (RMS) of the output current, output power, and heat dissipation efficiency for that order can be calculated. Then, the RMS of the output current, output power, and heat dissipation efficiency for each order are used for fitting and calibration to obtain a specific relationship.

[0092] It should be noted here that the specific relationship expressed above is merely an example. Other fitting relationships and other methods set according to actual conditions can also be used in this application. For example, heat dissipation efficiency can be predicted by machine learning models through output current and output power. This application is not limited here.

[0093] Return to reference Figure 2 After estimating the heat dissipation efficiency of the target DC charging pile:

[0094] S103. Determine whether the estimated heat dissipation efficiency meets the heat dissipation requirements.

[0095] S104. When the estimated heat dissipation efficiency does not meet the heat dissipation requirements, send a notification to the maintenance terminal associated with the target DC charging pile indicating that the target DC charging pile needs maintenance.

[0096] S105. When the estimated heat dissipation efficiency meets the heat dissipation requirements, return to execute S102.

[0097] Here, regarding the step of determining whether the estimated heat dissipation efficiency meets the heat dissipation requirements, as an example, in specific implementation, the ratio of the estimated heat dissipation efficiency to the ideal heat dissipation efficiency of the outward heat dissipation can be obtained, and it can be determined whether the ratio is less than a first threshold. When the ratio is less than the first threshold, it is determined that the estimated heat dissipation efficiency does not meet the heat dissipation requirements; the first threshold is matched with the predetermined use environment of the target DC charging pile.

[0098] It should be noted that due to the product attributes of DC charging piles, the environments in which they are used cannot be completely consistent. For example, the application environment of a DC charging pile may be in the south where temperatures are mostly above freezing, or in the north where temperatures are low most of the time. Therefore, the operating state of DC charging piles differs in different application environments. Thus, the application of the first threshold needs to be matched with the current usage environment of the DC charging pile. For example, if the average temperature range of the DC charging pile's usage environment is 15 to 20 degrees Celsius, then the first threshold corresponding to this average temperature range needs to be used to determine the heat dissipation efficiency of the DC charging pile. Those skilled in the art should understand that there are corresponding first thresholds for different usage environments, which are obtained through prior experiments.

[0099] In other words, the first threshold can be set comprehensively based on factors such as the charging performance of the target DC charging pile, its service life, the natural environment of the installation location of the target DC charging pile, and the standards for operation and maintenance of the target DC charging pile. For example, considering the influence of temperature, the preset threshold can be set relatively low for target DC charging piles installed in hot environments or during summer. Or, considering that the service life will cause the charging pile performance to naturally degrade, the first threshold can be set relatively low for target DC charging piles with a long service life.

[0100] Ideally, under optimal performance and without adverse factors, the ideal heat dissipation efficiency of a DC charging pile is considered to be 100%. Adverse factors include, but are not limited to: ventilation blockage of the dustproof netting on the DC charging pile, dust settling, and the adhesion of fibrous material; overheating failure of internal components, etc. Therefore, in this application, the ideal heat dissipation efficiency of the DC charging pile can be defined as K. Thus, the range of the estimated heat dissipation efficiency is [0, K], and the range of the ratio of the estimated heat dissipation efficiency to the ideal heat dissipation efficiency is [0, 1]. The larger the ratio of the estimated heat dissipation efficiency to the ideal heat dissipation efficiency, the better the current heat dissipation capacity of the target DC charging pile; conversely, the smaller the ratio of the estimated heat dissipation efficiency to the standard heat dissipation efficiency, the worse the current heat dissipation capacity of the target DC charging pile.

[0101] For example, if the first threshold is 0.6 (the intended operating environment is an environment with an average temperature range of 15 to 20 degrees Celsius), and the resulting ratio is 0.5, then the heat dissipation efficiency of the target DC charging pile does not meet the heat dissipation requirements. It is necessary to send a notification to the maintenance terminal associated with the target DC charging pile, indicating that the target DC charging pile requires maintenance. Exemplary methods for sending the notification to the maintenance terminal may include software push messages, SMS notifications, terminal vibration, and terminal alarm ringing, etc., and this application does not impose any limitations on these methods.

[0102] Regarding the step of determining whether the estimated heat dissipation efficiency meets the heat dissipation requirements, as another example, in specific implementation, it can be determined whether the estimated heat dissipation efficiency is less than a second threshold. When the estimated heat dissipation efficiency is less than the second threshold, it is determined that the current heat dissipation efficiency of the target DC charging pile does not meet the heat dissipation requirements; the second threshold also matches the predetermined usage environment of the target DC charging pile. Here, the predetermined usage environment has the same meaning as explained above, and will not be repeated here.

[0103] Here, the second threshold can also be set comprehensively based on factors such as the charging performance of the target DC charging pile, its service life, the natural environment of the installation location of the target DC charging pile, and the standards for operation and maintenance of the target DC charging pile.

[0104] In this way, regardless of whether the target DC charging pile's heat dissipation efficiency is insufficient due to dust net settling and blockage or flocculation, a malfunction in the target DC charging pile's heat dissipation components, or a malfunction in other electrical components that generate excessive heat, a notification indicating that the target DC charging pile requires maintenance can be sent to the associated maintenance terminal when the heat dissipation efficiency is insufficient. This improves the comprehensiveness of DC charging pile maintenance.

[0105] The following is a specific example of the operation and maintenance monitoring method for DC charging piles provided in the embodiments of this application.

[0106] The output current A1 and output power P1 provided by the target DC charging pile to the vehicle battery at a specific moment under a specific order during the charging process are obtained; based on the output current A1 and output power P1, a pre-fitted specific relationship is used. The estimated heat dissipation efficiency of the target DC charging pile is η1. The ideal heat dissipation efficiency η2 corresponding to the operating environment of the target DC charging pile is determined. Considering factors such as the charging performance, service life, natural environment of the installation location, and maintenance standards of the target DC charging pile, the comprehensive heat dissipation requirement for the target DC charging pile is set as follows: η1 / η2 must not be less than m. Therefore, by comparing the relationship between η1 / η2 and m, it can be determined whether the current heat dissipation efficiency of the target DC charging pile meets the heat dissipation requirements. When the current heat dissipation efficiency of the target DC charging pile does not meet the heat dissipation requirements, i.e., η1 / η2 < m, a notification that the target DC charging pile needs maintenance is sent to the maintenance terminal associated with the target DC charging pile.

[0107] It should be noted that, in the above example, directly using the form η1 / η2 to represent the ratio of the estimated heat dissipation efficiency η1 to the ideal heat dissipation efficiency η2 is only one possible implementation of this application; based on the disclosure of this application, any modifications or substitutions to the form η1 / η2 of the ratio of the estimated heat dissipation efficiency η1 to the ideal heat dissipation efficiency η2 can be used to represent the ratio of the estimated heat dissipation efficiency η1 to the ideal heat dissipation efficiency η2. For example, the ratio of the estimated heat dissipation efficiency η1 to the ideal heat dissipation efficiency η2 can also be expressed as η2 / η1, or 1-η1 / η2, or (η2-η1) / η2, etc., and this application does not impose any limitations on this.

[0108] According to an embodiment of this application, a method for monitoring and maintaining DC charging piles can estimate the heat dissipation efficiency of a target DC charging pile based on the output current and output power provided by the target DC charging pile to the vehicle battery during charging. This allows for the determination of the target DC charging pile's current heat dissipation capacity (i.e., heat dissipation efficiency), and when the heat dissipation capacity does not meet the heat dissipation requirements, a notification requiring maintenance is sent to the relevant maintenance terminal. This method enables timely maintenance of DC charging piles requiring upkeep, improving the efficiency and accuracy of DC charging pile maintenance, avoiding over-maintenance of unnecessary DC charging piles, thereby improving maintenance manpower efficiency and reducing the manpower investment required by charging pile operators.

[0109] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a DC charging pile operation and maintenance monitoring device provided in an embodiment of this application. The operation and maintenance monitoring device is applied to a charging pile operation and maintenance system, which includes multiple independently installed DC charging piles, such as... Figure 4 As shown, the operation and maintenance monitoring device 400 includes:

[0110] The acquisition module 410 is used to acquire the output current and output power provided by the target DC charging pile to the vehicle battery during the charging process; the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current required to be output to the vehicle battery according to the vehicle-side communication protocol message; the output power is obtained by detecting the actual power output by the target DC charging pile or calculated based on the output current.

[0111] The estimation module 420 is used to estimate the heat dissipation efficiency of the current target DC charging pile's outward heat dissipation based on the output current and output power.

[0112] The sending module 430 is used to determine whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the heat dissipation requirements, it sends a notification to the maintenance terminal associated with the target DC charging pile indicating that the target DC charging pile needs maintenance.

[0113] Furthermore, when the estimation module 420 estimates the heat dissipation efficiency of the current target DC charging pile based on the output current and output power, the estimation module 420 is used to:

[0114] Based on the output current and output power, a pre-fitted specific relationship is used to estimate the heat dissipation efficiency of the current target DC charging pile; the heat dissipation efficiency is a certain function relationship with the nth power of the output current and the output power, respectively.

[0115] Furthermore, the estimation module 420 is used to fit the specific relational expression in the following manner:

[0116] For a first DC charging pile of the same model as the target DC charging pile, historical charging data of the first DC charging pile at different times under different charging orders within at least one predetermined time period is obtained; the historical charging data includes output current, output power, air inlet temperature, and air outlet temperature; the air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile; the air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile; the aging degree of the first DC charging pile is less than or equal to the aging threshold.

[0117] For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile under the corresponding output current and output power at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point.

[0118] Using the pre-defined factory parameter mapping relationship of the DC charging pile, the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment is determined.

[0119] By fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time, a specific relationship is obtained.

[0120] Furthermore, when the estimation module 420 is used to perform fitting and calibration using the output current, output power, and heat dissipation efficiency corresponding to each order at each time moment to obtain a specific relationship, the estimation module 420 is used to:

[0121] For each order, based on the output current, output power, and heat dissipation efficiency at each moment under that order, calculate the root mean square of the output current, output power, and heat dissipation efficiency for that order.

[0122] By fitting and calibrating the data using the root mean square of the output current, output power, and heat dissipation efficiency corresponding to each order, a specific relationship is obtained.

[0123] Furthermore, the specific relation includes:

[0124]

[0125] Where p represents the order; t represents the time. This represents the heat dissipation efficiency at time t under order p; This represents the output current at time t under order p; This represents the output power at time t under order p; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer representing the order of the specific relation obtained by fitting.

[0126] According to an embodiment of this application, a DC charging pile operation and maintenance monitoring device can estimate the heat dissipation efficiency of the target DC charging pile based on the output current and output power provided by the target DC charging pile to the vehicle battery during charging. It then determines whether the estimated heat dissipation efficiency meets the heat dissipation requirements. If the estimated heat dissipation efficiency does not meet the requirements, it sends a notification requiring maintenance to the relevant operation and maintenance terminal. This method allows for timely maintenance of DC charging piles that require upkeep, improving the efficiency and accuracy of DC charging pile operation and maintenance. It avoids over-maintenance of unnecessary DC charging piles, thereby improving the efficiency of operation and maintenance manpower and reducing the manpower investment of charging pile operators.

[0127] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 500 includes a processor 510, a memory 520, and a bus 530.

[0128] The memory 520 stores machine-readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 and the memory 520 communicate via the bus 530. When the machine-readable instructions are executed by the processor 510, they can perform the operations described above. Figure 2 The steps of the operation and maintenance monitoring method for a DC charging pile shown in the method embodiment can be found in the method embodiment for specific implementation, and will not be repeated here.

[0129] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 2 The steps of the operation and maintenance monitoring method for a DC charging pile shown in the method embodiment can be found in the method embodiment for specific implementation, and will not be repeated here.

[0130] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0132] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0133] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0134] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0135] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for operation and maintenance monitoring of a DC charging pile, characterized in that, The operation and maintenance monitoring method is applied to a charging pile operation and maintenance system, which includes multiple independently configured DC charging piles. The operation and maintenance monitoring method includes: The system acquires the output current and output power supplied by the target DC charging pile to the vehicle battery during the charging process; the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current demanded by the target DC charging pile as indicated by the vehicle-side communication protocol message; the output power is obtained by detecting the actual power output by the target DC charging pile or by calculating the output current. Based on the output current and output power, the heat dissipation efficiency of the target DC charging pile is estimated. Obtain the ratio of the estimated heat dissipation efficiency to the ideal heat dissipation efficiency of the outward heat dissipation, and determine whether the ratio is less than a first threshold. If the ratio is less than the first threshold, it is determined that the estimated heat dissipation efficiency does not meet the heat dissipation requirements. The first threshold is matched with the predetermined use environment of the target DC charging pile. If the estimated heat dissipation efficiency does not meet the heat dissipation requirements, a notification indicating that the target DC charging pile needs maintenance is sent to the maintenance terminal associated with the target DC charging pile.

2. The operation and maintenance monitoring method according to claim 1, characterized in that, The step of estimating the heat dissipation efficiency of the target DC charging pile based on the output current and output power includes: Based on the output current and output power, a pre-fitted specific relationship is used to estimate the heat dissipation efficiency of the current target DC charging pile; the heat dissipation efficiency is a certain function relationship with the nth power of the output current and the output power, respectively.

3. The operation and maintenance monitoring method according to claim 2, characterized in that, The specific relation is obtained by fitting in the following way: For a first DC charging pile of the same model as the target DC charging pile, historical charging data of the first DC charging pile at different times under different charging orders within at least one predetermined time period is obtained; the historical charging data includes output current, output power, air inlet temperature and air outlet temperature; the air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile; the air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile; the aging degree of the first DC charging pile is less than or equal to the aging threshold. For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point. Using the pre-defined factory parameter mapping relationship of the DC charging pile, the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment is determined. By fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time, a specific relationship is obtained.

4. The operation and maintenance monitoring method according to claim 3, characterized in that, The step of fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time point to obtain a specific relationship includes: For each order, based on the output current, output power, and heat dissipation efficiency at each moment under that order, calculate the root mean square of the output current, output power, and heat dissipation efficiency for that order respectively; By fitting and calibrating the data using the root mean square of the output current, output power, and heat dissipation efficiency corresponding to each order, a specific relationship is obtained.

5. The operation and maintenance monitoring method according to claim 2, characterized in that, The specific relational expressions include: ； in, Indicates an order; Indicates time; Indicates in Order Placement The heat dissipation efficiency at any given moment; Indicates in Order Placement The output current at that moment; Indicates in Order Placement The output power corresponding to the time; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer, representing the order of the specific relation obtained by fitting.

6. A monitoring and maintenance device for a DC charging pile, characterized in that, The operation and maintenance monitoring device is applied to the charging pile operation and maintenance system, which includes multiple independently installed DC charging piles. The operation and maintenance monitoring device includes: The acquisition module is used to acquire the output current and output power provided by the target DC charging pile to the vehicle battery during the charging process; the output current is obtained by detecting the actual current output by the target DC charging pile; the actual current is the current required to be output to the vehicle battery according to the vehicle-side communication protocol message; the output power is obtained by detecting the actual power output by the target DC charging pile or calculated based on the output current; The estimation module is used to estimate the heat dissipation efficiency of the current target DC charging pile's outward heat dissipation based on the output current and output power. The sending module is used to obtain the ratio of the estimated heat dissipation efficiency to the ideal heat dissipation efficiency of the outward heat dissipation, and to determine whether the ratio is less than a first threshold. If the ratio is less than the first threshold, it is determined that the estimated heat dissipation efficiency does not meet the heat dissipation requirements. The first threshold is matched with the predetermined use environment of the target DC charging pile. When the estimated heat dissipation efficiency does not meet the heat dissipation requirements, a notification indicating that the target DC charging pile needs maintenance is sent to the maintenance terminal associated with the target DC charging pile.

7. The operation and maintenance monitoring device according to claim 6, characterized in that, When the estimation module is used to estimate the heat dissipation efficiency of the current target DC charging pile's outward heat dissipation based on the output current and output power, the estimation module is used to: Based on the output current and output power, a pre-fitted specific relationship is used to estimate the heat dissipation efficiency of the current target DC charging pile; the heat dissipation efficiency is a certain function of the nth power of the output current and output power.

8. The operation and maintenance monitoring device according to claim 7, characterized in that, The estimation module is used to fit the specific relational expression in the following manner: For a first DC charging pile of the same model as the target DC charging pile, historical charging data of the first DC charging pile at different times under different charging orders within at least one predetermined time period is obtained; the historical charging data includes output current, output power, air inlet temperature and air outlet temperature; the air inlet temperature is the temperature obtained by detecting the air inlet installed on the cabinet of the first DC charging pile; the air outlet temperature is the temperature obtained by detecting the air outlet installed on the cabinet of the first DC charging pile; the aging degree of the first DC charging pile is less than or equal to the aging threshold. For each charging order at each time point, determine the heat dissipation temperature rise value of the first DC charging pile at that time point; the heat dissipation temperature rise value is the difference between the air outlet temperature and the air inlet temperature at that time point. Using the pre-defined factory parameter mapping relationship of the DC charging pile, the heat dissipation efficiency corresponding to the heat dissipation temperature rise value under the output current and output power of the first DC charging pile at that moment is determined. By fitting and calibrating the output current, output power, and heat dissipation efficiency corresponding to each order at each time, a specific relationship is obtained.

9. The operation and maintenance monitoring device according to claim 7, characterized in that, When the estimation module is used to fit and calibrate the output current, output power, and heat dissipation efficiency corresponding to each order at each time point to obtain a specific relationship, the estimation module is used for: For each order, based on the output current, output power, and heat dissipation efficiency at each moment under that order, calculate the root mean square of the output current, output power, and heat dissipation efficiency for that order respectively; By fitting and calibrating the data using the root mean square of the output current, output power, and heat dissipation efficiency corresponding to each order, a specific relationship is obtained.

10. The operation and maintenance monitoring device according to claim 8, characterized in that, The specific relational expressions include: ； in, Indicates an order; Indicates time; Indicates in Order Placement The heat dissipation efficiency at any given moment; Indicates in Order Placement The output current at that moment; Indicates in Order Placement The output power corresponding to the time; a, b, and c represent the coefficients of the specific relation obtained by fitting; n is a positive integer, representing the order of the specific relation obtained by fitting.

11. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the operation and maintenance monitoring method for a DC charging pile as described in any one of claims 1 to 5.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, performs the steps of the operation and maintenance monitoring method for a DC charging pile as described in any one of claims 1 to 5.

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