A safe charging operation method of a charging pile and the charging pile

Abstract

The application discloses a safe charging operation method of a charging pile and the charging pile, and the most effective charging gun temperature and internal temperature are determined through a multi-data value comparison mode; at least two heat dissipation strategies are preset; demand current information of a current charging vehicle is acquired, a current threshold, a charging gun temperature threshold and an internal temperature threshold are preset; whether the demand current information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold and whether the charging gun temperature is greater than the charging gun temperature threshold are judged, and a corresponding heat dissipation strategy is selected according to a judgment result. The charging gun temperature and the internal temperature are most effectively reflected by selecting the maximum value, and then different heating conditions of the charging pile are determined through the threshold section, and the corresponding heat dissipation strategy is selected, so that the safety of the charging operation of the charging pile is ensured while the energy consumption and resource waste of the charging pile are reduced.

Description

[0001] This case is a divisional application based on the invention patent filed on August 7, 2023, with application number 202310985445.9 and title "A heat dissipation control method for a charging pile and a charging pile". Technical Field

[0002] This invention relates to the field of charging pile technology, and in particular to a safe charging operation method for a charging pile and a charging pile. Background Technology

[0003] Traditional charging stations mostly use air cooling, which passively achieves cooling by exchanging heat with the air. However, in high-power charging stations, especially those that increase the charging current, air cooling cannot achieve the desired cooling effect. This leads to increased heat loss in the charging cable, overheating of the charging gun, and inability to achieve fast charging functionality.

[0004] However, a new type of cable, the liquid-cooled cable, has emerged. This cable reduces heat generation in the conductor under prolonged or high-power operation. With the same conductor cross-sectional area, the liquid-cooled cable not only increases current carrying capacity by several times but is also much lighter and less bulky than traditional cables. This significantly improves utilization. It is precisely this characteristic that has led to the widespread use of liquid-cooled cables in the field of new energy vehicle charging, especially in high-power charging. Consequently, a charging pile device combining air and water cooling has emerged, possessing comprehensive and powerful heat dissipation capabilities.

[0005] For this type of charging pile equipment, how to make more effective use of the combined air-cooling and water-cooling heat dissipation function, while reducing resource waste and ensuring the safe operation of the charging pile, has become a technical problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a safe charging operation method and a charging pile, which can reduce resource waste while ensuring the safe operation of the charging pile.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A safe charging operation method for a charging pile, applied to a charging pile with a liquid cooling mechanism and an air cooling mechanism, wherein the liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun, and includes the following steps: The DC positive port temperature, DC negative port temperature, DC positive cable temperature, DC negative cable temperature, internal ambient temperature of the gun housing, positive electrode temperature at the tail, and negative electrode temperature at the tail of the liquid-cooled charging gun are obtained, and the maximum value is selected as the charging gun temperature. The internal ambient temperature of the charging pile, the temperature above the main / negative and positive fuses, and the inlet / outlet temperature of the liquid cooler are obtained, and the maximum value is selected as the internal temperature. At least two heat dissipation strategies are preset; Obtain the current demand information of the vehicle currently being charged, and preset the current threshold, charging gun temperature threshold, and internal temperature threshold. Determine whether the required current information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold. Based on the determination results, select the corresponding heat dissipation strategy.

[0008] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows: A charging pile includes a charging pile body, a liquid cooling mechanism, an air cooling mechanism, and a main control board located inside the charging pile body. The liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun. The liquid cooler is located inside the charging pile body, and the liquid-cooled charging gun is connected to the charging pile body via a liquid-cooled cable. The liquid cooler controls the circulation of liquid in the liquid-cooled cable of the liquid-cooled charging gun. The charging pile body and the liquid-cooled charging gun are equipped with temperature sensors connected to the main control board. The main control board controls the air-cooling mechanism and the liquid-cooling mechanism, and can obtain the vehicle's required current information through the liquid-cooled charging gun, so as to realize the steps in the above-mentioned safe charging operation method of a charging pile.

[0009] The beneficial effects of this invention are as follows: It provides a safe charging operation method and charging pile for charging stations. The method determines the most effective charging gun temperature and internal temperature through comparison of multiple data values; it presets at least two heat dissipation strategies; it acquires the current demand information of the vehicle currently being charged, and presets current thresholds, charging gun temperature thresholds, and internal temperature thresholds; it determines whether the current demand information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold; and selects the corresponding heat dissipation strategy based on the determination results. This invention selects the maximum value to most effectively reflect the charging gun temperature and internal temperature, and then determines different heating conditions of the charging pile through threshold ranges, selecting the corresponding heat dissipation strategy, thus reducing energy consumption and resource waste while ensuring the safe operation of the charging pile. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating the steps of a safe charging operation method for a charging pile according to an embodiment of the present invention; Figure 2 This is a structural example diagram of a charging pile according to an embodiment of the present invention; Figure 3 This is a structural example diagram of a liquid-cooled cable used in a charging pile according to an embodiment of the present invention; Figure 4This is a flowchart illustrating a specific method for safe charging operation of a charging pile according to an embodiment of the present invention. Detailed Implementation

[0011] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0012] Please refer to Figure 1 A safe charging operation method for a charging pile, applicable to a charging pile with a liquid cooling mechanism and an air cooling mechanism, wherein the liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun, and includes the following steps: The DC positive port temperature, DC negative port temperature, DC positive cable temperature, DC negative cable temperature, internal ambient temperature of the gun housing, positive electrode temperature at the tail, and negative electrode temperature at the tail of the liquid-cooled charging gun are obtained, and the maximum value is selected as the charging gun temperature. The internal ambient temperature of the charging pile, the temperature above the main / negative and positive fuses, and the inlet / outlet temperature of the liquid cooler are obtained, and the maximum value is selected as the internal temperature. At least two heat dissipation strategies are preset; Obtain the current demand information of the vehicle currently being charged, and preset the current threshold, charging gun temperature threshold, and internal temperature threshold. Determine whether the required current information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold. Based on the determination results, select the corresponding heat dissipation strategy.

[0013] As described above, the beneficial effects of this invention are as follows: It determines the most effective charging gun temperature and internal temperature through comparison of multiple data values; it presets at least two heat dissipation strategies; it acquires the current demand information of the currently charging vehicle, and presets current thresholds, charging gun temperature thresholds, and internal temperature thresholds; it determines whether the current demand information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold; and selects the corresponding heat dissipation strategy based on the determination results. This invention selects the maximum value to most effectively reflect the charging gun temperature and internal temperature, and then uses threshold ranges to determine different heating conditions of the charging pile, selecting the corresponding heat dissipation strategy, thereby reducing energy consumption and resource waste while ensuring the safe operation of the charging pile.

[0014] Furthermore, the heat dissipation strategy includes whether to turn on the inlet and outlet fans of the charging pile and the inlet and outlet fans of the liquid cooler, and whether to reduce the current limit of the charging pile.

[0015] The current threshold includes a first current threshold, a second current threshold, and a third current threshold, which are set sequentially from low to high. The internal temperature thresholds include a first internal temperature threshold, a second internal temperature threshold, and a third internal temperature threshold, set sequentially from low to high. The charging gun temperature threshold includes a first charging gun temperature threshold, a second charging gun temperature threshold, a third charging gun temperature threshold, and a fourth charging gun temperature threshold. All of the current threshold, the internal temperature threshold, and the charging gun temperature threshold can be adjusted.

[0016] The step of selecting the corresponding heat dissipation strategy based on the judgment result includes: If the required current is greater than the first current threshold, the internal temperature is greater than the first internal temperature threshold, or the charging gun temperature is greater than the second charging gun temperature threshold, then the liquid cooler is turned on. If the required current is greater than the second current threshold, then the air inlet fan and air outlet fan of the charging pile and the air inlet fan and air outlet fan of the liquid cooler are turned on. If the required current is greater than the third current threshold, the internal temperature is greater than the second internal temperature threshold, and the charging gun temperature is greater than the third charging gun temperature threshold, then the air inlet fan and air outlet fan of the charging pile and the air inlet fan and air outlet fan of the liquid cooler are turned on. If the temperature of the charging gun is greater than the fourth charging gun temperature threshold, the current limit of the charging pile is reduced to the third current limit.

[0017] As described above, different heat dissipation strategies can be adopted to reduce the power consumption of the charging pile itself, thus saving energy. When charging with a small current, according to Joule's law, the heat generated inside the charging pile is relatively small, and air cooling can meet the cooling needs. However, when charging with a large current, water cooling alone can only meet the heat exchange of the charging cable, and the residual heat in the charging pile space cannot be exchanged in time, so air cooling is also required.

[0018] Furthermore, it also includes: If the temperature of the charging gun is greater than or equal to the first charging gun temperature threshold, a fault shutdown is triggered. The rate of temperature rise of the charging gun is calculated to obtain the temperature rise rate. It is then determined whether the charging gun temperature is greater than a preset sixth charging gun temperature threshold or whether the temperature rise rate is greater than a preset rate threshold. If so, a fault shutdown is triggered.

[0019] As described above, the liquid cooling mechanism also needs to be tested for liquid cooling during operation. In the event of leakage, a fault shutdown will be triggered directly to avoid safety accidents.

[0020] Furthermore, it also includes: The second current threshold is preset to 300A; Provided that the liquid chiller is started and the required current is less than the second current threshold, determine whether the required current is less than 250A, the charging gun temperature is less than 65℃, and the internal temperature is less than 65℃. If so, keep the inlet / outlet fans of the charging pile and the inlet / outlet fans of the liquid chiller in the off state; otherwise, turn on the inlet / outlet fans of the charging pile and the inlet / outlet fans of the liquid chiller.

[0021] As described above, proper adjustment of the liquid cooler and the inlet / outlet fans is necessary to ensure optimal heat dissipation.

[0022] Please refer to Figure 2 A charging pile includes a charging pile body, a liquid cooling mechanism, an air cooling mechanism, and a main control board located inside the charging pile body; The liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun. The liquid cooler is located inside the charging pile body, and the liquid-cooled charging gun is connected to the charging pile body via a liquid-cooled cable. The liquid cooler controls the circulation of liquid in the liquid-cooled cable of the liquid-cooled charging gun. The charging pile body and the liquid-cooled charging gun are equipped with temperature sensors connected to the main control board. The main control board controls the air-cooling mechanism and the liquid-cooling mechanism, and can obtain the vehicle's required current information through the liquid-cooled charging gun, so as to realize the steps in the above-mentioned safe charging operation method of a charging pile.

[0023] As described above, the beneficial effects of this invention are as follows: It determines the most effective charging gun temperature and internal temperature through comparison of multiple data values; it presets at least two heat dissipation strategies; it acquires the current demand information of the currently charging vehicle, and presets current thresholds, charging gun temperature thresholds, and internal temperature thresholds; it determines whether the current demand information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold; and selects the corresponding heat dissipation strategy based on the determination results. This invention selects the maximum value to most effectively reflect the charging gun temperature and internal temperature, and then uses threshold ranges to determine different heating conditions of the charging pile, selecting the corresponding heat dissipation strategy, thereby reducing energy consumption and resource waste while ensuring the safe operation of the charging pile.

[0024] Furthermore, the air-cooling mechanism includes an air inlet and an air outlet on the charging pile body, as well as a fan located at the air inlet and the air outlet. The air inlet and the air outlet are located on opposite sides of the charging pile.

[0025] As described above, the air-cooling mechanism specifically consists of an air inlet and an air outlet, i.e., a corresponding fan, installed on the charging pile itself. The air inlet and air outlet are arranged opposite each other, forming an air duct that runs through the charging pile itself, thereby effectively dissipating heat from the charging pile.

[0026] Furthermore, the liquid cooler is also provided with air inlets, air outlets, and fans located at the air inlets and air outlets on opposite sides. The air duct formed by the air inlet and outlet of the liquid chiller has the same airflow direction as the air duct formed by the air inlet and outlet of the charging pile. As described above, the liquid cooler is also equipped with opposing air ducts, which effectively dissipates heat from the liquid cooler. At the same time, the air ducts of the liquid cooler and the charging pile body are in the same direction, which avoids airflow collision and can enhance the airflow speed and improve the heat dissipation effect.

[0027] The present invention provides a heat dissipation control method for a charging pile and a charging pile, which is applicable to scenarios where the vehicles targeted by the charging pile have fast charging requirements.

[0028] Please refer to Figure 1 and Figure 4 Embodiment 1 of the present invention is as follows: A safe charging operation method for a charging pile includes the following steps: S1. Real-time monitoring and acquisition of the internal temperature of the charging pile and the temperature of the charging gun; S2. Obtain the current demand information of the current charging vehicle, and adjust the output current limit of the charging pile according to the current demand information, the internal temperature and the charging gun temperature, and perform comprehensive control of the liquid cooling mechanism and the air cooling mechanism.

[0029] Specifically, steps S1 and S2 include: S102. Obtain the DC positive port temperature, DC negative port temperature, DC positive cable temperature, DC negative cable temperature, internal ambient temperature of the gun housing, positive electrode temperature at the tail, and negative electrode temperature at the tail of the liquid-cooled charging gun, and select the maximum value as the charging gun temperature. S104. Obtain the internal ambient temperature of the charging pile, the temperature above the main / negative and positive fuses, and the inlet / outlet temperature of the liquid cooler, and select the maximum value as the internal temperature; S106, with at least two preset heat dissipation strategies; S108. Obtain the current demand information of the current charging vehicle, and preset the current threshold, charging gun temperature threshold and internal temperature threshold. S110. Determine whether the required current information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold. Based on the determination results, select the corresponding heat dissipation strategy.

[0030] In some embodiments, a safe charging operation method for a charging pile further includes the following: S01. Obtain leakage information and determine if there is a leakage. If so, trigger a fault shutdown. The acquisition of the leakage information specifically involves: Obtain the leakage status of the charging cable of the liquid-cooled charging gun and the liquid level status of the liquid cooler to determine whether leakage exists.

[0031] In this embodiment, the liquid cooling mechanism has an autonomous detection function, capable of feeding back the liquid level status (high / low level) of the liquid cooler and the leakage status of the liquid cooling gun (1: no leakage; 2: liquid present (not coolant); 3: leakage detected; 4: timeout range value). In this embodiment, leakage detection is performed based on the leakage status of the charging cable of the liquid cooling charging gun and the liquid level status of the liquid cooler. A high level liquid level in the liquid cooler indicates leakage, or a leakage status of either 3 (leakage detected) or 4 (timeout range value) in the charging cable of the liquid cooling gun indicates leakage.

[0032] S02. Detect and determine whether the communication of the liquid chiller is normal. If it is normal, proceed to step S1; otherwise, proceed to step S03. S03. Turn off the liquid cooler, adjust the current limit of the charging pile to the preset first current limit, and turn on the air inlet fan and air outlet fan of the charging pile to obtain the temperature of the charging gun in real time. If the temperature of the charging gun reaches the preset first charging gun temperature threshold, a fault shutdown is triggered.

[0033] In this embodiment, it is determined whether the control communication of the liquid chiller is normal. If it is normal, the subsequent steps are performed; otherwise, the liquid chiller unit is shut down and the water pump operating voltage is 0V. Then, the charging pile current limit is set to 180A, and the inlet / outlet fans inside the charging pile are turned on. Then, the charging gun temperature is monitored and determined. If the charging gun temperature is greater than or equal to 60°C, a fault shutdown is triggered.

[0034] In this embodiment, the first current limit is 180A and the first charging gun temperature threshold is 60℃. In other equivalent embodiments, these can be adjusted according to actual needs.

[0035] The internal temperature of the charging pile and the temperature of the charging gun can be collected before S01 or between any two adjacent steps from S01 to S03. In this embodiment, it is performed between step S01 and step S02.

[0036] Combination Figure 4 As shown, steps S106 to S108 are as follows: Determine whether the required current is greater than a preset first current threshold, the internal temperature is greater than a preset first internal temperature threshold, or the charging gun temperature is greater than a preset second charging gun temperature threshold. If so, turn on the liquid cooler, and the water pump of the liquid cooler runs at the first power to increase the current limit of the charging pile to the preset second current limit. Otherwise, proceed to step S03. The first current threshold is less than or equal to the second current limit.

[0037] In this embodiment, it is determined whether there is a required current > 180A, Tamb > 20℃, or Tmax > 30℃. If so, the liquid chiller is turned on, the water pump operating voltage is 10V, and the current limit is increased to 400V. Otherwise, the liquid chiller is turned off, and the water pump operating voltage is 0V. Then, the charging pile current limit is set to 180A, the inlet / outlet fans in the charging pile are turned on, and the charging gun temperature is monitored and determined. If the charging gun temperature is greater than or equal to 60℃, a fault shutdown is triggered.

[0038] In this embodiment, the first current threshold is 180A, which is equal to the first current limit; the first internal temperature threshold is 25°C; the second charging gun temperature threshold is 30°C; and the second current limit is 400V. In other equivalent embodiments, each value can be adjusted according to actual needs.

[0039] Determine whether the required current is greater than a preset second current threshold. If so, turn on the air inlet and outlet fans of the charging pile and the air inlet and outlet fans of the liquid cooler.

[0040] In this embodiment, it is determined whether the required current is greater than 300A. If so, the air intake and exhaust fans of the charging pile and the liquid cooling unit are turned on to improve heat dissipation. In this embodiment, the second current threshold is 300A, which can be adjusted according to actual needs in other equivalent embodiments.

[0041] Determine whether the required current is greater than a preset third current threshold, the internal temperature is greater than a second internal temperature threshold, and the charging gun temperature is greater than a third charging gun temperature threshold. If so, turn on the air inlet fan and air outlet fan of the charging pile, as well as the air inlet fan and air outlet fan of the liquid cooler.

[0042] In this embodiment, based on the requirement current being less than 300A, it is further determined whether the requirements current <250A, Tamb <65℃, and Tmax <65℃ are simultaneously met. If so, it indicates that the charging current is small and the charging pile temperature is low. Since liquid cooling is already activated, no further increase in heat dissipation is needed; therefore, the inlet / outlet fans of the charging pile and the liquid cooler are turned off. Otherwise, the inlet and outlet fans of the charging pile and the liquid cooler must still be turned on.

[0043] In this embodiment, the third current threshold is 250A, and the second internal temperature threshold and the third charging gun temperature threshold are 64°C. In other equivalent embodiments, they can be adjusted according to actual needs.

[0044] Determine whether the temperature of the charging gun is greater than the preset fourth charging gun temperature threshold. If so, reduce the current limit of the charging pile to the third current limit until the temperature of the charging gun is reduced to below the preset fifth charging gun temperature threshold. The steps following the reduction of the charging station's current limit to the third current limit include: The rate of temperature rise of the charging gun is calculated to obtain the temperature rise rate. It is then determined whether the charging gun temperature is greater than a preset sixth charging gun temperature threshold or whether the temperature rise rate is greater than a preset rate threshold. If so, a fault shutdown is triggered.

[0045] In this embodiment, the system detects whether the charging gun temperature Tmax is greater than 70°C. If so, the current limit is adjusted to 180A until the charging gun temperature drops below 60°C. If the charging gun temperature continues to rise, reaching 90°C or the temperature rise rate reaches 0.5°C / min, a fault shutdown is triggered.

[0046] In this embodiment, the temperature threshold of the fourth charging gun is 70°C, the temperature threshold of the fifth charging gun is 60°C, the temperature threshold of the sixth charging gun is 90°C, the rate threshold is 0.5°C / min, and the third current limit is 180A. In other equivalent embodiments, each value can be adjusted according to actual needs.

[0047] Please refer to Figure 2 and Figure 3 Embodiment two of the present invention is as follows: A charging pile includes a charging pile body, a liquid cooling mechanism, an air cooling mechanism, and a main control board located within the charging pile body.

[0048] The liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun. The liquid cooler is located inside the charging pile body, and the liquid-cooled charging gun is connected to the charging pile body via a liquid-cooled cable. The liquid cooler controls the circulation of liquid in the liquid-cooled cable of the liquid-cooled charging gun.

[0049] In this embodiment, a liquid-cooled charging gun is used instead of a traditional charging gun. The liquid-cooled charging gun consists of a charging gun head and a liquid-cooled cable. The structure of the liquid-cooled cable can be found in [reference needed]. Figure 3 As shown. Additionally, a liquid cooling system needs to be added to the charging station to control the circulation of the liquid in the cable of the liquid-cooled charging gun.

[0050] The air-cooling mechanism includes an air inlet and an air outlet on the charging pile body, as well as a fan located at the air inlet and the air outlet. The air inlet and the air outlet are located on opposite sides of the charging pile.

[0051] The liquid chiller also has air inlets and outlets on opposite sides, as well as fans located at the air inlets and outlets. The air ducts formed by the air inlets and outlets of the liquid chiller have the same airflow direction as the air ducts formed by the air inlets and outlets of the charging pile.

[0052] In this embodiment, the charging pile body is equipped with an air outlet, an air inlet, and two fans facing each other to accelerate airflow and facilitate heat exchange. The liquid cooler is also equipped with an air outlet, an air inlet, and two fans, and their positions and directions correspond to those of the charging pile body.

[0053] The charging pile body and the liquid-cooled charging gun are equipped with temperature sensors connected to the main control board.

[0054] The main control board controls the air-cooling mechanism and the liquid-cooling mechanism, and can obtain the vehicle's required current information through the liquid-cooled charging gun, so as to realize the steps in the safe charging operation method of a charging pile in the above embodiment 1.

[0055] In summary, this invention combines liquid cooling and air cooling. Based on the current demand information of the charging vehicle and the temperature of the charging pile and charging gun, it controls the working power of the liquid cooling mechanism and the air cooling mechanism, and can adjust the current limit of the charging pile. This effectively controls the operating temperature of the charging pile, avoids overheating, and improves charging safety.

[0056] The charging pile collects real-time data on the DC positive / negative port temperature of the liquid cooling gun, the DC positive / negative cable temperature of the liquid cooling gun, the internal ambient temperature of the gun housing, the impact status of the charging cable of the liquid cooling gun, the leakage status of the charging cable of the liquid cooling gun, the liquid level status of the liquid cooler, the inlet / outlet temperature of the liquid cooler, the internal ambient temperature of the charging pile, the impact status of the charging pile, the temperature above the main / negative positive fuse, and the positive / negative electrode temperature at the tail of the liquid cooling gun. Based on this information, the charging pile system adjusts and controls the current and voltage during charging in real time, thereby making the charging time faster and more efficient, enhancing the charging safety and reliability, and extending the equipment life.

[0057] Different cooling strategies are adopted according to the current required by the vehicle, which can also reduce the power consumption of the charging pile itself and save energy. When charging with a small current, according to Joule's law, the heat generated inside the charging pile is small, and air cooling can meet the cooling needs. However, when charging with a large current, water cooling alone can only meet the heat exchange of the charging cable, and the residual heat in the charging pile space cannot be exchanged in time, so air cooling is also required.

[0058] This invention supports fast charging, fully charging electric vehicle batteries in a short time. The use of a liquid-cooled charging gun reduces its weight and facilitates user insertion and removal. It avoids problems such as overheating and leakage during charging, enhancing charging safety and reliability. Different heat dissipation strategies can be employed based on the charging current, while also reducing the power consumption of the charging station itself, thus saving energy. Furthermore, it extends the equipment's lifespan.

[0059] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A safe charging operation method for a charging pile, applied to a charging pile having a liquid cooling mechanism and an air cooling mechanism, wherein the liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun, characterized in that, Includes the following steps: The DC positive port temperature, DC negative port temperature, DC positive cable temperature, DC negative cable temperature, internal ambient temperature of the gun housing, positive electrode temperature at the tail, and negative electrode temperature at the tail of the liquid-cooled charging gun are obtained, and the maximum value is selected as the charging gun temperature. The internal ambient temperature of the charging pile, the temperature above the main / negative and positive fuses, and the inlet / outlet temperature of the liquid cooler are obtained, and the maximum value is selected as the internal temperature. At least two heat dissipation strategies are preset; Obtain the current demand information of the vehicle currently being charged, and preset the current threshold, charging gun temperature threshold, and internal temperature threshold. Determine whether the required current information is greater than the current threshold, whether the internal temperature is greater than the internal temperature threshold, and whether the charging gun temperature is greater than the charging gun temperature threshold. Based on the determination results, select the corresponding heat dissipation strategy.

2. The safe charging operation method for a charging pile according to claim 1, characterized in that, The heat dissipation strategy includes whether to turn on the inlet and outlet fans of the charging pile and the inlet and outlet fans of the liquid cooler, and whether to reduce the current limit of the charging pile.

3. The safe charging operation method for a charging pile according to claim 2, characterized in that, The current threshold includes a first current threshold, a second current threshold, and a third current threshold, which are set sequentially from low to high. The internal temperature thresholds include a first internal temperature threshold, a second internal temperature threshold, and a third internal temperature threshold, set sequentially from low to high. The charging gun temperature threshold includes a first charging gun temperature threshold, a second charging gun temperature threshold, a third charging gun temperature threshold, and a fourth charging gun temperature threshold. All of the current threshold, the internal temperature threshold, and the charging gun temperature threshold can be adjusted.

4. The safe charging operation method for a charging pile according to claim 3, characterized in that, The step of selecting the corresponding heat dissipation strategy based on the judgment result includes: If the required current is greater than the first current threshold, the internal temperature is greater than the first internal temperature threshold, or the charging gun temperature is greater than the second charging gun temperature threshold, then the liquid cooler is turned on. If the required current is greater than the second current threshold, then the air inlet fan and air outlet fan of the charging pile and the air inlet fan and air outlet fan of the liquid cooler are turned on. If the required current is greater than the third current threshold, the internal temperature is greater than the second internal temperature threshold, and the charging gun temperature is greater than the third charging gun temperature threshold, then the air inlet fan and air outlet fan of the charging pile and the air inlet fan and air outlet fan of the liquid cooler are turned on. If the temperature of the charging gun is greater than the fourth charging gun temperature threshold, the current limit of the charging pile is reduced to the third current limit.

5. A safe charging operation method for a charging pile according to claim 4, characterized in that, Also includes: If the temperature of the charging gun is greater than or equal to the first charging gun temperature threshold, a fault shutdown is triggered. The rate of temperature rise of the charging gun is calculated to obtain the temperature rise rate. It is then determined whether the charging gun temperature is greater than a preset sixth charging gun temperature threshold or whether the temperature rise rate is greater than a preset rate threshold. If so, a fault shutdown is triggered.

6. A safe charging operation method for a charging pile according to claim 4, characterized in that, Also includes: The second current threshold is preset to 300A; Provided that the liquid chiller is started and the required current is less than the second current threshold, determine whether the required current is less than 250A, the charging gun temperature is less than 65℃, and the internal temperature is less than 65℃. If so, keep the inlet / outlet fans of the charging pile and the inlet / outlet fans of the liquid chiller in the off state; otherwise, turn on the inlet / outlet fans of the charging pile and the inlet / outlet fans of the liquid chiller.

7. A charging pile, characterized in that, It includes the charging pile body, liquid cooling mechanism, air cooling mechanism, and main control board located inside the charging pile body; The liquid cooling mechanism includes a liquid cooler and a liquid-cooled charging gun. The liquid cooler is located inside the charging pile body, and the liquid-cooled charging gun is connected to the charging pile body via a liquid-cooled cable. The liquid cooler controls the circulation of liquid in the liquid-cooled cable of the liquid-cooled charging gun. The charging pile body and the liquid-cooled charging gun are equipped with temperature sensors connected to the main control board. The main control board controls the air-cooling mechanism and the liquid-cooling mechanism, and can obtain the vehicle's required current information through the liquid-cooled charging gun, so as to implement the steps in the safe charging operation method of a charging pile as described in any one of claims 1-6.

8. A charging pile according to claim 7, characterized in that, The air-cooling mechanism includes an air inlet and an air outlet on the charging pile body, as well as a fan located at the air inlet and air outlet. The air inlet and the air outlet are located on opposite sides of the charging pile.

9. A charging pile according to claim 8, characterized in that, The liquid chiller also has air inlets and air outlets on opposite sides, as well as fans located at the air inlets and air outlets; The air duct formed by the air inlet and outlet of the liquid chiller has the same airflow direction as the air duct formed by the air inlet and outlet of the charging pile.

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