A charging pile preventive dehumidification control method and system

Abstract

The application discloses a charging pile preventive dehumidification control method and system. The method comprises the following steps: acquiring the internal environment temperature and the environment humidity of the charging pile in real time, and simultaneously acquiring the temperature of the inner wall of the shell of the charging pile; calculating the dew point temperature of the current internal air of the charging pile according to the internal environment temperature and the environment humidity; calculating the temperature difference between the temperature of the inner wall of the shell of the charging pile and the dew point temperature; comparing the temperature difference with a preset early warning threshold value, and if the temperature difference is less than or equal to the preset early warning threshold value, determining the condensation risk level according to the temperature difference; executing a grading control strategy based on the condensation risk level, controlling the corresponding dehumidification execution unit to start, so as to increase the temperature of the inner wall of the shell and / or reduce the dew point temperature of the internal air, and increase the temperature difference; and when the temperature difference is greater than the sum of the preset early warning threshold value and a preset return difference, stopping the dehumidification execution unit or reducing the operation power thereof. The application can effectively avoid the generation of condensation, reduce energy consumption and prolong the service life of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of charging pile technology, and more specifically, relates to a preventive dehumidification control method and system for charging piles. Background Technology

[0002] With the increasing popularity of electric vehicles, charging stations, as a crucial basic charging infrastructure, have been widely deployed in various scenarios such as urban public parking lots, highway service areas, and residential communities. Charging stations typically operate in open outdoor environments for extended periods, inevitably facing the challenges of complex climatic conditions such as high temperatures, high humidity, large temperature differences between day and night, and rain and snow.

[0003] In areas with high temperature and humidity or large diurnal temperature variations, condensation easily forms inside the charging pile casing due to the temperature difference between the inside and outside. The physical mechanism is as follows: when the temperature of the inner wall of the charging pile casing drops below the dew point temperature of the internal air, water vapor in the air condenses into liquid water on the wall surface. Condensation adhering to electrical components, circuit boards, or connectors can cause serious safety hazards such as electrical short circuits, component corrosion, and decreased insulation performance. Especially in low-temperature and frigid environments, even a slight deviation between the PCB surface temperature and the dew point temperature can lead to condensation, causing instantaneous damage to the circuit board or power module and internal corrosion. Therefore, how to effectively prevent condensation inside charging piles has become a crucial technical problem that urgently needs to be solved in this field.

[0004] Currently, common anti-condensation solutions for charging piles can be mainly divided into the following two categories.

[0005] One type is the passive anti-condensation solution. These solutions primarily address condensation through structural design, such as creating drainage holes at the bottom of the casing, installing water collection tanks or drainage systems to expel condensed water droplets; or using desiccants on the inner walls of the casing for physical adsorption; or promoting air circulation through air inlets and outlets. However, these passive solutions cannot fundamentally prevent condensation; drainage or adsorption only occurs after condensation has already formed, making it a "post-event" solution. Furthermore, drainage holes are easily clogged by dust and insects, and may even allow humid air or ground water to enter the charging station through them. Desiccants also require periodic replacement once saturated, resulting in high maintenance costs.

[0006] Another type is reactive dehumidification solutions. These solutions install humidity sensors inside the charging station cabinet. When the humidity exceeds a fixed threshold (e.g., 80% RH), heaters, fans, or semiconductor cooling dehumidifiers are activated. For example, some solutions use temperature and humidity detection modules at the air inlet to acquire ambient temperature and humidity and calculate the dew point temperature, then activate the heating module based on the relationship between the cabinet temperature and ambient humidity. Other solutions collect internal and external humidity data, calculate the humidity difference and rate of change, and output control signals to the fan and heating module after fuzzification processing. Still other solutions use differentiated sensor arrays to monitor ambient temperature and humidity and PCB surface temperature, calculating the dew point temperature and using a tiered heating control strategy to prevent condensation. However, these reactive solutions have significant latency: condensation may occur before the humidity reaches the threshold; continuous high-threshold operation leads to energy waste, and frequent start-stop cycles may reduce device lifespan. Furthermore, some solutions rely on post-condensation detection, i.e., first determining if dew has formed and then performing decondensation if so, essentially remaining a passive "condensation first, then treatment" approach, failing to achieve true prevention.

[0007] In summary, existing technologies lack a dehumidification control solution that can accurately predict condensation risk, intervene before condensation actually occurs, and is energy-efficient. Summary of the Invention

[0008] The purpose of this invention is to propose a preventative dehumidification control method and system for charging piles, addressing the problems of existing passive drainage and reactive dehumidification schemes being unable to proactively intervene before condensation actually occurs, exhibiting latency and energy waste. This method proactively predicts condensation risks and initiates tiered dehumidification control in advance before condensation occurs, effectively preventing condensation while reducing energy consumption and extending equipment lifespan.

[0009] To achieve the above objectives, in a first aspect, the present invention proposes a preventative dehumidification control method for charging piles, comprising: Real-time acquisition of the internal ambient temperature and humidity of the charging pile, as well as the temperature of the inner wall of the charging pile casing; Calculate the dew point temperature of the air inside the charging pile based on the internal ambient temperature and humidity. Calculate the temperature difference between the inner wall temperature and the dew point temperature of the charging pile housing; The temperature difference is compared with a preset warning threshold. If the temperature difference is less than or equal to the preset warning threshold, the condensation risk level is determined based on the temperature difference. Based on the condensation risk level, a graded control strategy is implemented to control the corresponding dehumidification execution unit to start, so as to increase the temperature of the inner wall of the shell and / or decrease the dew point temperature of the internal air, thereby increasing the temperature difference; When the temperature difference exceeds the sum of the preset warning threshold and the preset hysteresis, the dehumidification unit is stopped or its operating power is reduced.

[0010] Optionally, the expression for calculating the dew point temperature is:

[0011] in,

[0012] In the formula, This refers to the dew point temperature of the air inside the charging station. The internal ambient temperature of the charging station. Humidity of the charging station's internal environment. and This is an empirical constant.

[0013] Optionally, the preset warning threshold is a configurable parameter with a value range of 1℃ to 5℃.

[0014] Optionally, the dehumidification unit includes at least one of the following: PTC heaters are installed near the inner wall of the charging pile housing or on the air duct to increase the temperature of the inner wall of the housing. A variable-speed cooling fan is installed at the ventilation opening or in the air duct of the charging pile housing to introduce external air to replace the air inside the charging pile, thereby reducing the absolute humidity of the air inside the charging pile.

[0015] Optionally, determining the condensation risk level based on the temperature difference includes: If 1℃ < ≤ The condensation risk level is low. If 0℃ < ≤1℃, the condensation risk level is medium risk; like ≤0℃, the condensation risk level is high risk; in, For temperature difference, , This refers to the temperature of the inner wall of the charging pile casing. This refers to the dew point temperature of the air inside the charging station. The preset warning threshold is used.

[0016] Optionally, implementing a graded control strategy based on the condensation risk level includes: When the risk level is low, the speed-regulating cooling fan is started and runs at the first fan speed. When the risk level is medium, the speed-regulating cooling fan is started and runs at the second wind speed, and the PTC heater is controlled to operate at the first power. When the risk level is high, the PTC heater is controlled to operate at a second power. Wherein, the second wind speed is greater than the first wind speed, and the second power is greater than the first power.

[0017] Optionally, it also includes: Obtain external weather forecast data; When rainfall and / or increased humidity are predicted within a preset time period, the preset warning threshold is increased.

[0018] Optionally, the preset hysteresis is 1°C.

[0019] Secondly, this invention proposes a preventive dehumidification control system for charging piles, comprising: The data acquisition module includes an ambient temperature and humidity sensor installed inside the charging pile, and a temperature sensor installed on the inner wall of the casing; it is used to collect the ambient temperature and humidity inside the charging pile, as well as the temperature of the inner wall of the charging pile casing. The control module, electrically connected to the acquisition module, is configured to execute the charging pile preventive dehumidification control method as described in any of the first aspects; The dehumidification unit is electrically connected to the control module and is used to increase the temperature of the inner wall of the housing and / or decrease the dew point temperature of the internal air under the control of the control module, thereby increasing the temperature difference.

[0020] Optionally, it also includes: The data communication module is connected to the control module and is used to receive external weather forecast data and upload local temperature and humidity data and condensation warning status to the cloud management platform.

[0021] The beneficial effects of this invention are as follows: By acquiring the internal ambient temperature and humidity of the charging pile in real time and simultaneously monitoring the temperature of the inner wall of the casing, the dew point temperature of the internal air can be accurately calculated, thereby obtaining the temperature difference between the inner wall temperature and the dew point temperature. This temperature difference is dynamically compared with a preset warning threshold, allowing for accurate prediction of condensation risk before the physical conditions for condensation are fully formed, achieving a fundamental shift from passive response to proactive prevention. By determining the condensation risk level based on the temperature difference and implementing a graded control strategy, the start-up timing and operating intensity of the dehumidification unit are precisely matched with the real-time risk level. This avoids the problem of untimely dehumidification caused by the lag in the traditional fixed threshold method and overcomes the energy waste caused by continuous high-energy-consumption operation, significantly improving dehumidification efficiency. By combining the increase in the inner wall temperature of the casing with the decrease in the dew point temperature of the internal air, the temperature difference margin between the wall temperature and the dew point is increased simultaneously from both positive and negative directions. This system can quickly and reliably eliminate condensation conditions, fundamentally preventing the generation of condensate and ensuring that electrical components are in a dry and safe working environment for a long time. Simultaneously, by introducing a hysteresis control mechanism, it effectively avoids frequent start-stops of the dehumidification unit at threshold boundaries by stopping the dehumidification actuator or reducing its operating power when the temperature difference exceeds the sum of the preset warning threshold and the preset hysteresis. This reduces the switching impact and mechanical wear of actuators such as heaters and fans, significantly extending the service life of the equipment and further optimizing system energy consumption. Furthermore, the risk-level-based hierarchical control strategy enables the system to maintain a safe state with low-power ventilation in low-risk conditions, quickly reverse the temperature difference trend with a combination of ventilation and heating in medium-risk conditions, and rapidly resolve the condensation crisis with full-power heating in high-risk conditions. It can achieve precise, efficient, and stable preventative dehumidification control under all operating conditions, demonstrating good environmental adaptability and engineering application value.

[0022] The system of the present invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0024] Figure 1 A flowchart illustrating the steps of a preventive dehumidification control method for charging piles according to Embodiment 1 of the present invention is shown.

[0025] Figure 2 A schematic diagram of the hierarchical control strategy state according to Embodiment 1 of the present invention is shown.

[0026] Figure 3 A schematic diagram of a preventive dehumidification control system for a charging pile according to Embodiment 2 of the present invention is shown. Detailed Implementation

[0027] The invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides a preventative dehumidification control method for charging piles, including: S1. Real-time acquisition of the internal ambient temperature and humidity of the charging pile, and simultaneously acquisition of the inner wall temperature of the charging pile casing; Specifically, real-time acquisition of the internal temperature and humidity of the charging pile is performed by a temperature and humidity sensor installed in the central airflow area of ​​the cabinet. The sensor's installation location must avoid direct radiation areas from heat-generating components such as PTC heaters and power modules, as well as air duct outlets, to ensure that the collected air parameters accurately reflect the overall environmental conditions inside the cabinet, rather than distorted values ​​from localized hot or cold areas. The sensor should ideally be fixed in a well-ventilated location on a bracket or mounting plate inside the cabinet, ensuring its temperature and humidity sensing elements are in full contact with the surrounding air. The sampling frequency can be set according to actual control requirements, typically updated every 1 to 5 seconds to ensure rapid system response to changes in temperature and humidity.

[0030] Meanwhile, real-time acquisition of the inner wall temperature of the housing is performed by a temperature sensor attached to the surface of the inner wall. The sensor should preferably be a negative temperature coefficient thermistor or a thin-film platinum resistance temperature sensor. Its sensing surface is tightly attached to the condensation-prone area of ​​the inner wall using thermally conductive silicone grease or adhesive. Typically, the central area of ​​the side wall or the inner surface of the top plate is chosen as the attachment location. These areas are far from the bottom drainage structure and heat sources, making them more sensitive to temperature changes and more likely to reach the dew point temperature. The attachment method of the temperature sensor must ensure that there are no air gaps between the sensing surface and the inner wall surface of the housing to avoid measurement deviations caused by contact thermal resistance. To ensure the accuracy of the wall temperature measurement, the sensor leads should be routed along the inner wall surface of the housing and fixed in place to prevent the sensor from detaching from the attachment surface due to suspended force.

[0031] S2. Calculate the dew point temperature of the air inside the charging pile based on the internal ambient temperature and humidity. In this step, the expression for calculating the dew point temperature is:

[0032] in,

[0033] In the formula, This refers to the dew point temperature of the air inside the charging station. The internal ambient temperature of the charging station. The humidity level inside the charging station. and This is an empirical constant.

[0034] Specifically, the dew point temperature is calculated based on the Magnus formula. Substituting the real-time collected internal ambient temperature and relative humidity into the following expression, the dew point temperature of the air inside the charging station is calculated:

[0035] in, For intermediate calculation variables, it is defined as:

[0036] In the above two formulas, This refers to the dew point temperature of the air inside the charging station (unit: °C). The internal ambient temperature of the charging station (unit: °C). The relative humidity (%RH) of the internal environment of the charging station. and Let be an empirical constant, and let take values ​​of respectively. =17.62、 =243.12. The above empirical constant value is based on the internationally accepted dew point calculation standard and is applicable to the accurate calculation of air dew point in the temperature range of 0℃ to 50℃, fully covering the ambient temperature range for normal operation of charging piles.

[0037] Let's take a typical operating condition as an example: Assume the internal ambient temperature of the charging pile is 25℃ and the relative humidity is 80%. =25、 =80 Substitute expression: =ln(80 / 100)+17.62×25 / (243.12+25)=ln(0.8)+440.5 / 268.12=-0.2231+1.6429=1.4198; Will Substituting 1.4198 into the dew point temperature expression: =243.12×1.4198 / (17.62-1.4198)=345.18 / 16.2002≈21.3℃; Under these environmental conditions, condensation will begin to form on the inner wall surface when the temperature drops to 21.3℃. This calculation result closely matches physical reality, verifying the accuracy and reliability of this calculation formula in charging pile application scenarios.

[0038] It should be noted that the selection of the aforementioned empirical constants, the precision of logarithmic operations, and the rounding error in division operations may all have a slight impact on the calculation results. Therefore, this embodiment uses floating-point arithmetic and retains two decimal places of precision to ensure that the accuracy of the dew point temperature calculation meets the requirements of engineering applications. The system's sampling and calculation cycle can be set according to actual control needs, typically between 1 and 5 seconds, to ensure rapid response to changes in temperature and humidity and to ensure that each graded control decision is based on the latest and most accurate calculation data.

[0039] In addition, when sensor data is abnormal (such as exceeding the measurement range or sudden change in the rate of change), the system can be configured to remove the current abnormal value and use the calculated value from the previous sampling period as the basis for control. At the same time, the abnormal event is recorded for maintenance personnel to trace and investigate, thereby ensuring the robustness and reliability of the system under non-ideal operating conditions.

[0040] S3. Calculate the temperature difference between the inner wall temperature and the dew point temperature of the charging pile casing; Specifically, the temperature difference between the real-time collected inner wall temperature of the charging pile casing and the current internal air dew point temperature calculated in step S2 is calculated, and the calculation expression is as follows: , This refers to the temperature of the inner wall of the charging pile casing. This refers to the dew point temperature of the air inside the charging station. The preset warning threshold is used.

[0041] This temperature difference is the core physical quantity characterizing the degree of condensation risk. When When the temperature is >0, it indicates that the temperature of the inner wall of the casing is higher than the dew point temperature. Water vapor in the air will not condense upon contact with the inner wall of the casing, and the charging station is in a safe state. When the temperature is 0, it indicates that the temperature of the inner wall of the shell is equal to the dew point temperature, the water vapor in the air has reached saturation on the surface of the inner wall of the shell, condensation is about to occur, and it is in a critical state; when... When the temperature is less than 0, it indicates that the temperature of the inner wall of the shell is lower than the dew point temperature, and condensation has already formed on the inner wall surface, indicating that it is in a state of condensation.

[0042] To illustrate with a typical operating condition in step S2: In the aforementioned example, when the internal ambient temperature of the charging pile is 25℃ and the relative humidity is 80%, the calculated dew point temperature is approximately 21.3℃. If the actual measured temperature of the inner wall of the casing is 23℃, then... =23-21.3=1.7℃, the inner wall temperature of the shell is 1.7℃ higher than the dew point temperature, which is a safe condition with no risk of condensation. If the inner wall temperature of the shell drops to 21.5℃, then... =21.5-21.3=0.2℃, the inner wall temperature of the shell is only 0.2℃ higher than the dew point temperature, close to the critical state, and there is a risk of condensation. If the inner wall temperature of the shell further drops to 20℃, then... =20-21.3=-1.3℃, the temperature of the inner wall of the shell is already lower than the dew point temperature, and condensation has begun to form on the inner wall surface.

[0043] Through the aforementioned temperature difference calculation, the system transforms the originally independent shell inner wall temperature parameter and air dew point temperature parameter into a quantitative indicator of condensation risk with clear physical meaning. This temperature difference directly reflects whether the shell inner wall surface possesses the physical conditions for condensation under the current environmental conditions. Its sign and magnitude precisely indicate the distance margin between the current wall surface and the condensation threshold, enabling the system to use this quantitative indicator as a basis for subsequent condensation risk level determination and the execution of graded dehumidification control strategies. Regardless of the magnitude of the shell inner wall temperature exceeding the dew point temperature, this temperature difference accurately quantifies the current safety margin or risk level, providing a unified and accurate physical quantitative standard for condensation risk assessment. It also provides a clear basis for setting thresholds for graded control strategies, ensuring that control decisions are reasonably explained and supported at the physical level.

[0044] S4. Compare the temperature difference with the preset warning threshold. If the temperature difference is less than or equal to the preset warning threshold, determine the condensation risk level based on the temperature difference. In this step, the preset warning threshold is a configurable parameter with a value range of 1℃ to 5℃.

[0045] In this step, determining the condensation risk level based on the temperature difference includes: If 1℃ < ≤ The risk level of condensation is low. If 0℃ < ≤1℃, the risk level of condensation is medium risk; like ≤0℃, the risk level of condensation is high; in, For temperature difference, , This refers to the temperature of the inner wall of the charging pile casing. This refers to the dew point temperature of the air inside the charging station. The preset warning threshold is used.

[0046] Specifically, the temperature difference calculated in step S3 Compared with the preset warning threshold A comparison is made to determine if there is a risk of condensation. A preset warning threshold is established. This is a configurable safety boundary parameter, which physically means that when the temperature of the inner wall of the casing exceeds the dew point temperature by a margin less than or equal to this threshold, the risk of condensation is considered to be approaching a critical state, requiring preventative intervention. This threshold can be flexibly set according to the climatic characteristics of the charging pile's location (such as the difference between humid southern regions and dry northern regions) and the charging pile's own protection level requirements, with a value range of 1°C to 5°C. For example, in high-temperature and high-humidity areas, the warning threshold can be set to 3°C or higher to allow the system to intervene earlier; while in dry climates or scenarios with higher protection levels, it can be set to 1°C to 2°C. In this embodiment, The typical value is 2℃, which balances the timeliness of early warning with the energy consumption of the execution equipment.

[0047] when > When the temperature of the inner wall of the shell is greater than the dew point temperature, it indicates that there is sufficient temperature margin between the current wall surface and the condensation critical point, the risk of condensation is low, and the risk level judgment is not triggered. The monitoring status will continue.

[0048] when ≤ When this occurs, it indicates that the temperature of the inner wall of the shell is close to or below the dew point temperature, increasing the risk of condensation. Further adjustments should be made based on the temperature difference. The specific numerical value determines the condensation risk level. For example... Figure 2 As shown, the specific divisions are as follows: If 1℃ < ≤ If the temperature is within this range, it is considered low risk. This range indicates that although the temperature of the inner wall of the shell is still higher than the dew point temperature (…), it is considered low risk. (The value is positive), but the temperature difference has narrowed to within the warning threshold, and the wall temperature is close to the condensation critical point. There is a trend of gradually developing in an unfavorable direction. If no intervention is taken, the wall temperature may further drop below the dew point temperature if the external environment continues to cool down or the internal humidity increases.

[0049] If 0℃ < A temperature ≤1℃ is classified as medium risk. This range indicates that the temperature difference between the inner wall temperature and the dew point temperature is less than 1℃. The wall temperature is very close to the condensation threshold, with minimal safety margin. Any slight temperature drop or humidity fluctuation in the environment could cause the wall temperature to drop below the dew point, leading to actual condensation. This risk level requires timely and effective intervention measures to reverse the temperature difference trend.

[0050] like A temperature ≤0℃ is considered high-risk. This range indicates that the internal wall temperature of the shell is below or equal to the dew point temperature, and the wall surface is at or below the critical condensation state. Water vapor in the air may condense into liquid water on the internal wall surface at any time. This level requires immediate and strongest intervention measures to rapidly raise the internal wall temperature of the shell or lower the internal air dew point temperature. It quickly recovered to a safe level.

[0051] Through the aforementioned grading determination, the system discretizes the continuously changing temperature difference into three risk levels with clear physical meaning and engineering operability, providing a decision-making basis for subsequent implementation of tiered control strategies. Different levels correspond to different dehumidification actions and operating intensities, making the control logic clear and the execution precise, while avoiding the problems of frequent start-stop or excessive intervention under single threshold control.

[0052] Taking the typical operating condition in step S2 as an example: when the internal ambient temperature of the charging pile is 25℃ and the relative humidity is 80%, the calculated internal air dew point temperature is approximately 21.3℃. The preset warning threshold is set to 2℃ in this embodiment.

[0053] When the measured temperature of the inner wall of the casing is 23℃, the temperature difference... =23-21.3=1.7℃. Because =1.7℃ less than =2℃ but greater than 1℃, satisfying 1℃ < If the temperature is ≤ΔT_th, the system determines the current condensation risk level to be low. At this time, although the temperature of the inner wall of the shell is still 1.7℃ higher than the dew point temperature, the temperature difference has entered the warning range, and the temperature of the inner wall of the shell is close to the condensation critical point, showing a trend of gradual deterioration. The system initiates corresponding preventive dehumidification measures under the low risk level.

[0054] If the ambient temperature of the charging station decreases further or the internal humidity increases, causing the temperature of the inner wall of the casing to drop to 21.5℃, the temperature difference... =21.5-21.3=0.2℃. At this time... Between 0℃ and 1℃, satisfying 0℃ < Under conditions of ≤1℃, the system determines that the risk of condensation has been upgraded to medium risk. At this point, the temperature of the inner wall of the shell is only 0.2℃ higher than the dew point temperature, with a very small safety margin. Any slight fluctuation in the environment may cause the wall temperature to drop below the dew point, requiring the system to take more proactive intervention measures in a timely manner to reverse the temperature difference trend.

[0055] If the temperature of the inner wall of the shell further drops to 20°C, the temperature difference... =20-21.3=-1.3℃. At this time... ≤0℃, the system determines the risk of condensation to be high. The temperature of the inner wall of the shell is already below the dew point temperature, and the wall surface has reached or fallen below the critical state for condensation. Water vapor in the air may condense into liquid water on the surface of the inner wall of the shell at any time. The system immediately activates the strongest intervention measures to rapidly increase the temperature of the inner wall of the shell or decrease the dew point temperature of the internal air, thus reducing the temperature difference. It quickly recovered to a safe level.

[0056] The risk level determination process for the above typical operating conditions shows that the system can determine the risk level based on real-time temperature difference. The system automatically and accurately identifies the current risk level based on the temperature difference, without requiring manual intervention. Under the same environmental conditions, different risk levels are automatically assigned based solely on the temperature of the inner wall of the shell (low risk corresponds to an inner wall temperature of 23°C, medium risk to 21.5°C, and high risk to 20°C), thereby implementing differentiated graded control strategies. This fully demonstrates the accuracy of the method in this embodiment, which uses temperature difference for quantitative graded judgment. It discretizes the continuously changing temperature difference into three risk levels with clear physical meaning and engineering operability, enabling the system to make accurate risk assessments and targeted control responses under different wall temperature conditions. This avoids the binary, coarse-grained control mode of traditional fixed threshold control schemes that only require "start or stop".

[0057] S5. Based on the condensation risk level, implement a graded control strategy to control the corresponding dehumidification execution unit to start up, so as to increase the temperature of the inner wall of the shell and / or reduce the dew point temperature of the internal air, thereby increasing the temperature difference. In this step, the dehumidification unit includes at least one of the following: PTC heaters are installed near the inner wall of the charging pile housing or on the air duct to increase the temperature of the inner wall of the housing. A variable-speed cooling fan is installed at the ventilation opening or in the air duct of the charging pile housing to introduce external air to replace the air inside the charging pile, thereby reducing the absolute humidity of the air inside the charging pile.

[0058] In this step, implementing a tiered control strategy based on the condensation risk level includes: When the risk is low, the speed-controlled cooling fan starts and runs at the first fan speed. When the risk level is medium, the speed-regulating cooling fan is started and runs at the second fan speed, and the PTC heater is controlled to operate at the first power. When the risk level is high, control the PTC heater to operate at the second power. Among them, the second wind speed is greater than the first wind speed, and the second power is greater than the first power.

[0059] Specifically, based on the determined condensation risk level, the corresponding graded control strategy is implemented to control the activation of the corresponding dehumidification unit, so as to increase the temperature of the inner wall of the shell and / or reduce the dew point temperature of the internal air, thereby increasing the temperature difference to a safe range.

[0060] The dehumidification unit includes at least one of the following: PTC heaters, featuring positive temperature coefficient thermistor characteristics, are installed near the inner wall of the charging pile housing or in the air duct. When powered on, the PTC heater generates Joule heat, directly raising the temperature of the inner wall of the housing through heat conduction and radiation, thereby increasing the temperature difference between the inner wall temperature and the dew point temperature. Because the resistance of the PTC material increases sharply with temperature, it possesses automatic temperature control characteristics, automatically reducing its heating power after reaching the set temperature. This avoids the overheating risk that can occur with traditional resistance wire heaters due to continuous temperature increases, offering advantages such as high safety, fast response speed, and stable heating efficiency.

[0061] A variable-speed cooling fan, installed at the ventilation opening or within the air duct of the charging pile casing, forces airflow to replace the humid air inside the charging pile with relatively dry external air. When the absolute humidity of the external air is lower than that of the air inside the charging pile, ventilation effectively reduces the absolute humidity of the internal air, thereby lowering the dew point temperature and indirectly increasing the temperature difference. Compared to heating methods, ventilation dehumidification consumes less energy and offers good economy and dehumidification effect when the external environment is relatively dry.

[0062] The implementation of a tiered control strategy based on condensation risk levels specifically includes: When the condensation risk level is low, it indicates that although the inner wall temperature of the casing is still higher than the dew point temperature, the temperature difference has narrowed to within the warning threshold, and the wall temperature is approaching the critical point of condensation, showing a trend of gradual deterioration. At this time, the condensation risk is low, and there is no need to start high-power heating equipment. The system controls the variable-speed cooling fan to start and operate at the first fan speed. The first fan speed is 50% of the rated speed of the variable-speed cooling fan (medium speed). At this speed, the fan operates at a lower speed and power consumption, with less operating noise, making it suitable for long-term continuous operation. The fan introduces an appropriate amount of external air to replace the internal humid air, reducing the absolute humidity and dew point temperature of the internal air, thereby fine-tuning the temperature difference with minimal energy consumption, allowing the temperature difference to gradually rise back to a safe range. During this stage, only the fan is started, and the PTC heater is not activated, which can maintain a safe state with minimal energy consumption and avoid unnecessary heating power consumption.

[0063] When the condensation risk level is medium, it indicates that the temperature difference between the inner wall temperature and the dew point temperature is less than 1°C, with a very small safety margin. Any slight fluctuation in the environment (such as a sudden drop in external temperature or an increase in humidity) may cause the wall temperature to drop below the dew point, resulting in actual condensation. At this point, low-speed ventilation alone is insufficient to quickly reverse the temperature difference trend, and more proactive intervention measures are required. The variable-speed cooling fan is controlled to operate at the second fan speed, while the PTC heater is started and operates at its first power. The second fan speed is the rated speed (full speed) of the variable-speed cooling fan. Running the fan at full speed displaces the internal humid air with maximum air exchange, minimizing the absolute humidity of the internal air and thus lowering the dew point temperature. The first power is 50% of the rated power of the PTC heater (half power). The PTC heater operates in a half-power preheating mode, avoiding the instantaneous current surge to the power grid caused by full-power startup, and gradually increasing the inner wall temperature of the shell through heat conduction and radiation. The two methods work synergistically: the fan works to lower the dew point temperature, while the PTC heater works to raise the wall temperature. By simultaneously pushing the temperature difference ΔT from both directions towards the center, the system responds quickly enough to move the temperature difference ΔT out of the medium-risk range and back to a safe level. This two-way synergistic strategy of "ventilation to lower the dew point + heating to raise the wall temperature," compared to heating or ventilation alone, achieves the maximum temperature difference increase in the shortest time, effectively preventing further deterioration of condensation conditions.

[0064] When the condensation risk level is high, it indicates that the temperature of the inner wall of the casing is below or equal to the dew point temperature, and the wall surface has reached or fallen below the critical condensation state. Water vapor in the air may condense into liquid water on the inner wall surface at any time. If strong intervention measures are not taken immediately, condensation will be inevitable. At this time, the PTC heater is controlled to operate at its second power, and the variable-speed cooling fan is kept off. The second power is the rated power (full power) of the PTC heater. The PTC heater operates at full power to directly heat the inner wall of the casing with maximum heat output. Through heat conduction and heat radiation, the wall temperature is rapidly raised above the dew point temperature, quickly widening the temperature difference and allowing the system to move out of the high-risk range as soon as possible. At the same time, the variable-speed cooling fan is not started because: at high risk, the temperature of the inner wall of the casing is already below the dew point temperature. If outside air is continued to be introduced at this time, the outside air may come into contact with the cooler inner wall of the casing, accelerating condensation. Especially when the external ambient temperature is low or the humidity is high, ventilation may bring in more water vapor or further lower the wall temperature, exacerbating the condensation risk rather than alleviating it. Therefore, under high-risk conditions, the system prioritizes heating the enclosed space to ensure that all electrical energy is converted into heat and concentrated on the inner wall of the casing, rather than being used for ventilation. Once the temperature difference returns to a safe range, the system reverts to normal monitoring and repeats the aforementioned grading and control process based on the real-time temperature difference.

[0065] In the above-described hierarchical control strategy, the second wind speed is greater than the first wind speed, and the second power is greater than the first power. In this embodiment, the first wind speed is 50% of the rated speed of the variable-speed cooling fan (medium speed), and the second wind speed is the rated speed of the variable-speed cooling fan (full speed); the first power is 50% of the rated power of the PTC heater (half power), and the second power is the rated power of the PTC heater (full power). Through the above-described three-level progressive control strategy, the appropriate intensity of dehumidification methods can be accurately matched under different risk levels, achieving a smooth transition from light ventilation to bidirectional coordination and then to full-power heating. While ensuring that the risk of condensation is effectively controlled, the overall energy consumption of the system and the mechanical wear of the actuators are minimized. Compared with the binary control mode of "either full speed operation or complete shutdown" in the traditional fixed threshold control scheme, the hierarchical progressive strategy of this embodiment significantly improves control accuracy and energy efficiency, and has better environmental adaptability and long-term operating economy.

[0066] S6. When the temperature difference exceeds the sum of the preset warning threshold and the preset hysteresis, stop the dehumidification unit or reduce its operating power.

[0067] In this step, the preset hysteresis is 1℃.

[0068] Specifically, when the temperature difference increases to more than the sum of the preset warning threshold and the preset hysteresis after adjustment by the graded control strategy, the operation of the dehumidification unit is stopped or its operating power is reduced to avoid energy waste caused by excessive dehumidification.

[0069] The preset hysteresis is a key control parameter introduced in this step. Its physical meaning is: after the dehumidification unit starts, the temperature difference is allowed to rise to a safe upper boundary above the start-up threshold before the stop operation is performed, thus forming a hysteresis interval between the start-up threshold and the stop threshold. In this embodiment, the preset hysteresis is fixed at 1℃. Referring to the typical value of the aforementioned preset warning threshold of 2℃: the start-up condition of the dehumidification unit is a temperature difference ≤ 2℃ (i.e., the inner wall temperature is close to the dew point temperature, increasing the risk of condensation), while the stop condition is a temperature difference > 2℃ + 1℃ = 3℃ (i.e., the inner wall temperature has risen to more than 3℃ above the dew point temperature, and the risk of condensation has been fully eliminated). The difference of 1℃ between the start-up threshold (2℃) and the stop threshold (3℃) constitutes a hysteresis interval with a width of 1℃.

[0070] The core function of this hysteresis interval is to prevent the dehumidification unit from frequently starting and stopping at the threshold boundary. If the start threshold and stop threshold are set to the same value (e.g., both 2℃), then when the temperature difference drops from 2.1℃ to 2.0℃, dehumidification will start. When the temperature difference rises back to 2.1℃, the dehumidification unit will stop immediately. After stopping, it will start again when the temperature drops back to 2.0℃, and so on, resulting in a high-frequency oscillation state of "start-stop-start-stop". This oscillation not only severely reduces the dehumidification effect, but also significantly increases the risk of damage to power devices caused by the switching inrush current of the PTC heater, as well as the wear and shortened lifespan of the motor caused by the frequent start and stop of the speed-regulating cooling fan. Long-term operation will significantly reduce the reliability of the equipment.

[0071] By introducing a preset hysteresis of 1℃, the stop threshold is raised to 3℃. Once the dehumidification unit starts, it will continue to run until the temperature difference reaches 3℃ before stopping. Because there is a 1℃ temperature difference buffer between the stop threshold (3℃) and the start threshold (2℃), after the dehumidification unit stops, the temperature of the inner wall of the casing will naturally drop below 2℃ for a considerable period. During this time, the system remains in a stable monitoring state and will not be frequently triggered to restart due to minor temperature fluctuations, fundamentally eliminating the occurrence of high-frequency oscillations. This mechanism is particularly crucial for the protection of PTC heaters. PTC heaters experience a large inrush current when starting from a cold state, and frequent start-stop cycles can impact power switching devices and power supply lines. Hysteresis control effectively reduces the number of starts, significantly extending the service life of the heater and its drive circuit.

[0072] After the dehumidification unit stops, it does not immediately shut down all monitoring functions. Instead, it continues to acquire the internal ambient temperature, humidity, and inner wall temperature of the charging pile in real time, continuously calculating the dew point temperature and temperature difference to maintain continuous monitoring of condensation risk. When the temperature difference falls back to less than or equal to the preset warning threshold, the condensation risk level is re-determined based on the real-time temperature difference value, triggering the corresponding graded control strategy again. This cycle repeats, forming a closed-loop control process of "monitoring-determination-execution-stopping-remonitoring," ensuring that the charging pile maintains effective control over condensation risk during long-term operation.

[0073] In this embodiment, it also includes: Obtain external weather forecast data; When rainfall and / or increased humidity are forecast within a preset time period, the preset warning threshold is increased.

[0074] Specifically, this method also includes the step of acquiring external weather forecast data. By connecting to an Internet meteorological service platform or a regional meteorological monitoring system via wired or wireless means, real-time meteorological information of the location of the charging pile and weather forecast data for a future preset time period are acquired periodically. The future preset time period can be set to 1 hour, 3 hours, 6 hours or 12 hours in the future according to actual needs.

[0075] Weather forecast data includes at least information such as the probability of rainfall, rainfall intensity, and the trend of relative humidity changes. When rainfall is predicted to occur within a preset time period, and / or when a significant increase in relative humidity is predicted within a preset time period, the existing warning threshold is automatically increased, so that the tiered control strategy is triggered under higher temperature difference conditions.

[0076] The physical logic behind increasing the preset warning threshold is as follows: Rainfall or increased humidity leads to a significant increase in external ambient humidity. External humid air seeps into the enclosure through the breathing effect or vents, causing a rapid rise in the absolute humidity and dew point temperature of the internal air. This quickly compresses the previously safe temperature margin. If the original warning threshold remains unchanged, intervention might only be triggered when the dew point temperature has already risen significantly and the wall temperature is about to drop below the dew point, resulting in a delayed response. By raising the preset warning threshold in advance, the intervention time is moved forward, compensating for the loss of temperature margin due to the increased dew point temperature caused by rising external humidity. This ensures that the humidity inside the cabinet is controlled at a safe level before rainfall or high humidity arrives.

[0077] For example, assuming the default setting for the early warning threshold is 2°C, when rainfall is forecast within the next 3 hours, the threshold is automatically increased to 3°C or 4°C. Even if the current temperature difference is between 2°C and 3°C, because the threshold has been pre-adjusted, as long as the temperature difference is below the increased threshold, a tiered control strategy will be triggered, causing dehumidification to start proactively before rainfall, reducing the absolute humidity inside the cabinet and increasing the temperature of the inner wall of the casing. After rainfall begins, even if external humid air seeps into the cabinet, causing the internal dew point temperature to rise, because preventative dehumidification has been completed before the rainfall, a sufficient safety margin remains between the inner wall temperature of the casing and the dew point temperature, effectively preventing condensation from actually occurring during rainfall.

[0078] The increased preset warning threshold should not exceed its preset range. In this embodiment, the basic range of the preset warning threshold is 1°C to 5°C, so the increased threshold should still be within this range. When the predicted rainfall or high humidity ends and the external humidity returns to normal, the increased preset warning threshold will be automatically restored to the normal setting value to avoid excessively high thresholds that would trigger dehumidification operations too frequently under normal weather conditions, resulting in energy waste.

[0079] Example 2

[0080] like Figure 3 As shown, this embodiment provides a preventive dehumidification control system for charging piles, including: The data acquisition module includes an ambient temperature and humidity sensor installed inside the charging pile, and a temperature sensor installed on the inner wall of the casing; it is used to collect the ambient temperature and humidity inside the charging pile, as well as the temperature of the inner wall of the charging pile casing. The control module, electrically connected to the acquisition module, is configured to execute the preventive dehumidification control method for charging piles as described in Example 1. The dehumidification unit is electrically connected to the control module and is used to increase the temperature of the inner wall of the housing and / or decrease the dew point temperature of the internal air under the control of the control module, thereby increasing the temperature difference.

[0081] Specifically, the acquisition module includes two parts: an ambient temperature and humidity sensor and a shell inner wall temperature sensor, which are used to acquire the temperature and humidity parameters of the air inside the charging pile and the surface temperature parameters of the shell inner wall, respectively.

[0082] The ambient temperature and humidity sensor adopts an industrial-grade digital integrated temperature and humidity sensor, with built-in capacitive humidity sensing element and bandgap temperature sensing element. It directly converts the collected analog signals into digital signals for output via an internal analog-to-digital converter, featuring high measurement accuracy, good long-term stability, and strong anti-interference capability. The sensor's measurement range meets the full operating requirements of the charging pile: temperature measurement range covers -40℃ to +125℃ with an accuracy of ±0.5℃; relative humidity measurement range covers 0%RH to 100%RH with an accuracy of ±3%RH. The sensor has a protection rating of no less than IP67, possessing dustproof, moisture-proof, and shockproof capabilities, and can adapt to harsh environmental conditions such as condensation and dust that may exist inside the charging pile.

[0083] The sensor is installed in a well-ventilated area in the middle of the charging station cabinet, specifically fixed to a well-ventilated bracket or mounting plate within the cabinet. During installation, care should be taken to avoid direct radiation areas from heat-generating components such as PTC heaters, power modules, and charging modules, as well as from air duct outlets, to prevent distortion of the collected air parameters due to interference from local heat or cold sources. The sensor should have full contact with the surrounding air, and the temperature and humidity sensing elements should not be obstructed or sealed to ensure that the collected temperature and humidity data accurately reflect the overall environmental conditions inside the cabinet. The sensor can be fixed using mounting holes or wall-mounted, secured to the cabinet wall or beam using brackets or clips, ensuring stable installation and facilitating subsequent maintenance and replacement. The sensor leads are routed through shielded cables via the cabinet's cable trays to the corresponding interface on the control module, with sufficient lead length to avoid pulling stress. To prevent dust accumulation from affecting measurement accuracy after long-term operation, a dust filter or breathable protective cover can be installed on the outside of the sensor's humidity sensing element, ensuring smooth airflow while preventing large dust particles from directly adhering to the sensitive element surface.

[0084] The internal temperature sensor of the housing employs either a negative temperature coefficient (NTC) thermistor or a thin-film platinum resistance thermometer (Pt100 / Pt1000). NTC thermistors offer advantages such as high sensitivity, fast response, and low cost, making them suitable for applications requiring high responsiveness to temperature changes. Platinum resistance thermometers, on the other hand, feature high accuracy and good long-term stability, making them suitable for applications demanding even higher measurement precision. The sensor's measurement range covers -40℃ to +150℃, with an accuracy of at least ±1℃. The sensor is encapsulated using either plastic molding or epoxy resin potting, providing moisture resistance, shock resistance, and resistance to high and low temperatures, with a protection rating of at least IP67.

[0085] The sensor is attached to the central area of ​​the side wall or the inner surface of the top plate of the charging pile housing. These areas are far from the bottom drainage structure and heat source, making them more sensitive to temperature changes and the most prone to condensation. During installation, the sensor's temperature-sensing surface is tightly adhered to the inner wall surface of the housing using thermally conductive silicone grease or adhesive, ensuring no air gaps between the temperature-sensing surface and the inner wall surface. This minimizes contact thermal resistance and avoids measurement deviations caused by air gaps. The thermally conductive silicone grease has excellent thermal conductivity and insulation properties, enabling it to quickly and accurately conduct the temperature of the inner wall surface to the sensor's temperature-sensing element, ensuring the real-time and accurate measurement of wall temperature. The sensor housing can be fixed to the wall surface using thermally conductive adhesive or spring brackets, ensuring that the temperature-sensing surface does not detach or loosen due to thermal expansion and contraction during long-term operation. The sensor leads should run along the inner wall surface of the housing and be secured with wire clips to prevent the sensor from detaching from the bonding surface or the leads from breaking due to unsupported force. The ends of the leads are connected to the corresponding interface of the control module using connectors or soldering.

[0086] The ambient temperature and humidity sensor and the housing inner wall temperature sensor are electrically connected to the analog input interface or digital bus interface of the control module via shielded cables. If the ambient temperature and humidity sensor has a digital output (such as I²C or a single-bus interface), it can be directly connected to the digital interface of the control module; if it has an analog output, the analog signal needs to be converted to a digital signal by the built-in analog-to-digital converter of the control module. If the housing inner wall temperature sensor is an NTC thermistor, it is usually combined with a fixed resistor to form a voltage divider circuit, and the temperature value is calculated by measuring the voltage divider value; if it is a platinum resistance thermometer, a bridge circuit or a dedicated temperature sensing chip is usually used for signal conditioning before inputting to the control module. The sampling frequency of the control module can be set according to actual control requirements, typically set to complete data acquisition and update of all sensor channels every 1 to 5 seconds to ensure rapid system response to changes in temperature, humidity, and wall temperature.

[0087] The control module is electrically connected to the acquisition module and serves as the core processor. Specifically, it can be a microcontroller (MCU), digital signal processor (DSP), or embedded processor—a chip with data processing and control logic capabilities. The control module receives the temperature and humidity signals output by the acquisition module and is configured to execute the preventative dehumidification control method for the charging pile as described in Example 1. This involves calculating the dew point temperature based on the internal ambient temperature and humidity, calculating the temperature difference between the inner wall temperature of the casing and the dew point temperature, comparing this temperature difference with a preset warning threshold to determine the condensation risk level, and executing a graded control strategy based on the condensation risk level to generate corresponding control commands.

[0088] The dehumidification unit is electrically connected to the control module and receives control commands from the control module. Under the control of the control module, it starts or stops operation to increase the temperature of the inner wall of the charging pile housing and / or decrease the dew point temperature of the internal air, thereby increasing the temperature difference. The dehumidification unit includes at least one of the following: a PTC heater, installed near the inner wall of the charging pile housing or on the air duct, for increasing the temperature of the inner wall of the housing; and a speed-regulating cooling fan, installed at the ventilation opening of the charging pile housing or in the air duct, for introducing external air to replace the air inside the charging pile, thereby reducing the absolute humidity of the air inside the charging pile.

[0089] The data acquisition module, control module, and dehumidification execution unit are electrically connected via internal cables. The data acquisition module converts the real-time temperature and humidity signals into electrical signals and transmits them to the control module. The control module calculates, compares, and makes logical judgments on the received signals to generate control commands, which are then sent to the dehumidification execution unit. The dehumidification execution unit executes the corresponding dehumidification actions according to the control commands, forming a closed-loop control circuit of "data acquisition-calculation-judgment-execution".

[0090] In this embodiment, it also includes: The data communication module communicates with the control module to receive external weather forecast data and upload local temperature and humidity data and condensation warning status to the cloud management platform.

[0091] Specifically, it also includes a data communication module, which communicates with the control module to receive external weather forecast data and upload local temperature and humidity data and condensation warning status to the cloud management platform.

[0092] The data communication module can use wired communication methods (such as Ethernet, RS485) or wireless communication methods (such as 4G / 5G, Wi-Fi, LoRa, NB-IoT), supporting IoT communication protocols such as HTTP / HTTPS and MQTT. In the data receiving direction, the module periodically obtains weather forecast data (including rainfall probability, humidity trends, etc.) for the charging pile's location from an internet meteorological service platform and transmits it to the control module as a basis for correcting preset warning thresholds. In the data sending direction, the module periodically or in real-time uploads local temperature and humidity data and condensation warning status to the cloud management platform for remote monitoring and warning management by maintenance personnel. In case of communication failure, the module can cache unsuccessfully transmitted data and re-upload it after communication is restored, ensuring data integrity. Through the configuration of the data communication module, centralized monitoring and intelligent operation and maintenance management of the charging pile cluster can be achieved.

[0093] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A preventative dehumidification control method for charging piles, characterized in that, include: Real-time acquisition of the internal ambient temperature and humidity of the charging pile, as well as the temperature of the inner wall of the charging pile casing; Calculate the dew point temperature of the air inside the charging pile based on the internal ambient temperature and humidity. Calculate the temperature difference between the inner wall temperature and the dew point temperature of the charging pile housing; The temperature difference is compared with a preset warning threshold. If the temperature difference is less than or equal to the preset warning threshold, the condensation risk level is determined based on the temperature difference. Based on the condensation risk level, a graded control strategy is implemented to control the corresponding dehumidification execution unit to start, so as to increase the temperature of the inner wall of the shell and / or decrease the dew point temperature of the internal air, thereby increasing the temperature difference; When the temperature difference exceeds the sum of the preset warning threshold and the preset hysteresis, the dehumidification unit is stopped or its operating power is reduced.

2. The preventive dehumidification control method for charging piles according to claim 1, characterized in that, The expression for calculating the dew point temperature is: in, In the formula, This refers to the dew point temperature of the air inside the charging station. The internal ambient temperature of the charging station. The humidity level inside the charging station. and This is an empirical constant.

3. The preventive dehumidification control method for charging piles according to claim 1, characterized in that, The preset warning threshold is a configurable parameter with a value range of 1℃ to 5℃.

4. The preventive dehumidification control method for charging piles according to claim 1, characterized in that, The dehumidification unit includes at least one of the following: PTC heaters are installed near the inner wall of the charging pile housing or on the air duct to increase the temperature of the inner wall of the housing. A variable-speed cooling fan is installed at the ventilation opening or in the air duct of the charging pile housing to introduce external air to replace the air inside the charging pile, thereby reducing the absolute humidity of the air inside the charging pile.

5. The preventive dehumidification control method for charging piles according to claim 4, characterized in that, The determination of the condensation risk level based on the temperature difference includes: If 1℃ < ≤ The condensation risk level is low. If 0℃ < ≤1℃, the condensation risk level is medium risk; like ≤0℃, the condensation risk level is high risk; in, For temperature difference, , This refers to the temperature of the inner wall of the charging pile casing. This refers to the dew point temperature of the air inside the charging station. The preset warning threshold is used.

6. The preventive dehumidification control method for charging piles according to claim 5, characterized in that, The graded control strategy based on the aforementioned condensation risk level includes: When the risk level is low, the speed-regulating cooling fan is started and runs at the first fan speed. When the risk level is medium, the speed-regulating cooling fan is started and runs at the second wind speed, and the PTC heater is controlled to operate at the first power. When the risk level is high, the PTC heater is controlled to operate at a second power. Wherein, the second wind speed is greater than the first wind speed, and the second power is greater than the first power.

7. The preventive dehumidification control method for charging piles according to claim 1, characterized in that, Also includes: Obtain external weather forecast data; When rainfall and / or increased humidity are predicted within a preset time period, the preset warning threshold is increased.

8. The preventive dehumidification control method for charging piles according to claim 1, characterized in that, The preset hysteresis is 1℃.

9. A preventive dehumidification control system for charging piles, characterized in that, include: The data acquisition module includes an ambient temperature and humidity sensor installed inside the charging pile, and a temperature sensor installed on the inner wall of the housing. Used to collect the internal ambient temperature and humidity of the charging pile, as well as the temperature of the inner wall of the charging pile casing. The control module, electrically connected to the acquisition module, is configured to execute the charging pile preventive dehumidification control method as described in any one of claims 1-8; The dehumidification unit is electrically connected to the control module and is used to increase the temperature of the inner wall of the housing and / or decrease the dew point temperature of the internal air under the control of the control module, thereby increasing the temperature difference.

10. The preventive dehumidification control system for charging piles according to claim 9, characterized in that, Also includes: The data communication module is connected to the control module and is used to receive external weather forecast data and upload local temperature and humidity data and condensation warning status to the cloud management platform.

Images