A water-cooled charging pile system and a water-cooling control method thereof

Abstract

The application provides a water-cooled charging pile system and a water-cooled control method thereof, which comprises a pile body, a control mainboard, a water-cooled unit, a high-voltage loop and a water-cooled gun head; the control mainboard, the water-cooled unit and the high-voltage loop are located in the pile body; the water-cooled gun head is located outside the pile body and is connected with the output end of the water-cooled unit and the high-voltage loop through a water-cooled pipeline and a water-cooled gun line respectively; the input end of the high-voltage loop is used for being connected with commercial power; a temperature sensor is arranged at the water-cooled gun head; the water-cooled gun head and the water-cooled unit are in communication and control connection with the control mainboard, and the control mainboard is used for being in communication and control connection with a vehicle BMS; and the safety problem caused by the increase of the charging current of the high-power charging pile is solved through the water-cooled gun head and the corresponding water-cooled control strategy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging piles, in particular to a charging pile system with water cooling and a water cooling control method thereof. BACKGROUND

[0002] With the development of the new energy industry, electric vehicles are becoming more and more popular in the market, and the charging piles for electric vehicles are also increasing. However, with the popularity of electric vehicles, the charging time of electric vehicles has not been significantly improved, which is mainly limited by the charging power. According to the existing national standard, the maximum current of the single gun charging of most charging piles on the market is 250A, and the charging voltage is generally not more than 750V. The power of a single charging pile generally does not exceed 180kw.

[0003] In order to improve the charging power of the charging pile, either the charging voltage is increased or the charging current is increased. The maximum charging voltage of the current charging pile is 750V, which is already relatively large. The electric vehicles on the market basically cannot reach 750V, so the effect of increasing the charging voltage is limited. The charging current can be increased, such as from 250A to 500A, and the power can reach more than 350kw or even higher.

[0004] In the face of such high-power charging piles with increased charging current, safety protection strategy is a key part. How to provide a sound protection mechanism to protect personnel and equipment safety has gradually become a problem to be solved. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a charging pile system with water cooling and a water cooling control method, to provide a water-cooled charging gun head for the charging pile, and to solve the safety problems brought by high-power charging piles by combining the corresponding water cooling control strategy.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] A charging pile system with water cooling, comprising a pile body, a control mainboard, a water cooling unit, a high-voltage loop and a water-cooled gun head;

[0008] The control mainboard, the water cooling unit and the high-voltage loop are located in the pile body;

[0009] The water-cooled gun head is located outside the pile body and is connected to the output end of the water cooling unit and the high-voltage loop through a water cooling pipeline and a water cooling gun line respectively, and the input end of the high-voltage loop is used to be connected to the commercial power;

[0010] A temperature sensor is arranged at the water-cooled gun head;

[0011] The water-cooled gun head and the water-cooled unit are in communication and control connection with the control mainboard.

[0012] To solve the above technical problems, another technical solution provided by the present application is:

[0013] A water-cooled control method of a water-cooled charging pile system is applied to the water-cooled charging pile system, and includes the following steps:

[0014] S1, when the vehicle is charging, the control mainboard in the charging pile body acquires the temperature collected by the temperature sensor at the water-cooled gun head in real time;

[0015] S2, the control mainboard sends corresponding working instructions to the water-cooled unit according to the temperature collected by the temperature sensor and the electric quantity parameters fed back by the vehicle BMS;

[0016] S3, the water-cooled unit receives the working instructions and controls the flow size of the cooling liquid in the water-cooled pipeline.

[0017] The present application has the advantages that the present application provides a water-cooled charging pile system and a water-cooled control method thereof. Since the charging gun head of the traditional high-power charging pile often has the problem of high temperature during charging, which leads to charging safety hazards, the present application transforms the traditional charging gun head into a water-cooled gun head, connects the water-cooled pipeline and the water-cooled gun line with the water-cooled unit and the high-voltage loop in the charging pile body, and sets a temperature sensor at the water-cooled gun head. The temperature at the gun head is collected in real time during vehicle charging and fed back to the control mainboard of the charging pile. The control mainboard sends working instructions to the water-cooled unit according to the charging temperature of the gun head and the charging electric quantity fed back by the vehicle BMS. The water-cooled unit adjusts the flow size of the cooling liquid in the water-cooled pipeline in real time, thereby adjusting the working temperature of the water-cooled gun head, and effectively solves the safety problem caused by the high-power charging pile. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure diagram of a water-cooled charging pile system of the embodiment of the present application.

[0019] Figure 2 It is a water-cooled control schematic diagram of a water-cooled charging pile system of the embodiment of the present application.

[0020] Figure 3 It is a transverse sectional view of a water-cooled gun line in a water-cooled charging pile system of the embodiment of the present application.

[0021] Figure 4 It is a communication block diagram of a water-cooled charging pile system of the embodiment of the present application.

[0022] Figure 5 A water cooling control method for a water-cooled charging pile system according to an embodiment of the present application is shown in the flowchart of Fig. 1.

[0023] Figure 6 A specific flowchart of a water cooling control method for a water-cooled charging pile system according to an embodiment of the present application is shown in the flowchart of Fig. 2.

[0024] Label explanation:

[0025] 1, pile body; 2, control mainboard; 3, water cooling unit; 4, water cooling gun head; 5, high-voltage loop; 6, water cooling pipeline; 7, water cooling gun wire; 71, positive cable; 72, negative cable; 73, gun wire internal environment. DETAILED DESCRIPTION

[0026] To explain the technical content, purposes and effects of the present application in detail, the following will be described in conjunction with the accompanying drawings.

[0027] Please refer to Figures 1 to 4 A water-cooled charging pile system, comprising a pile body, a control mainboard, a water cooling unit, a high-voltage loop and a water cooling gun head;

[0028] The control mainboard, the water cooling unit and the high-voltage loop are all located in the pile body;

[0029] The water cooling gun head is located outside the pile body and is connected with the output end of the water cooling unit and the high-voltage loop through a water cooling pipeline and a water cooling gun wire respectively, and the input end of the high-voltage loop is used to be connected with the commercial power supply;

[0030] A temperature sensor is arranged at the water cooling gun head;

[0031] The water cooling gun head and the water cooling unit are both in communication and control connection with the control mainboard, and the control mainboard is used to be in communication and control connection with the vehicle BMS.

[0032] From the above description, the beneficial effects of the present application are that, since the charging gun head of the traditional high-power charging pile often has the problem of temperature being too high during charging, leading to charging safety hazards, the present application transforms the traditional charging gun head into a water cooling gun head, connects the water cooling gun head with the water cooling unit and the high-voltage loop located in the pile body of the charging pile through a water cooling pipeline and a water cooling gun wire, and arranges a temperature sensor at the water cooling gun head, so that the temperature at the gun head during vehicle charging is collected in real time and fed back to the control mainboard of the charging pile, and the control mainboard issues a working instruction to the water cooling unit according to the charging temperature of the gun head and the charging capacity fed back by the vehicle BMS, so that the water cooling unit adjusts the flow rate of the cooling liquid in the water cooling pipeline in real time, thereby adjusting the working temperature of the water cooling gun head, and effectively solving the safety problem caused by the high-power charging pile.

[0033] Further, the water-cooled gun line includes a positive cable and a negative cable;

[0034] The part of the water-cooled pipeline outside the pile body is located in the water-cooled gun line;

[0035] The input ends of the positive cable and the negative cable are connected to the positive output end and the negative output end of the high-voltage loop, respectively;

[0036] The output ends of the positive cable and the negative cable are connected to DC+ and DC- of the water-cooled gun head, respectively.

[0037] As can be seen from the above description, the positive cable and the negative cable connected to the positive output end and the negative output end of the high-voltage loop are integrated in the water-cooled gun line, so that the water-cooled gun head outside the pile body and the water-cooled gun line form an integrated structure, which is convenient for charging the vehicle and can effectively protect the positive cable, the negative cable and the water-cooled pipeline outside the pile body.

[0038] Further, one temperature sensor is arranged at DC+ and DC- of the water-cooled gun head, respectively;

[0039] One temperature sensor is arranged at the position of the positive cable and the negative cable outside the pile body and away from the water-cooled gun head, respectively;

[0040] The two temperature sensors are arranged at the positions of the positive cable and the negative cable outside the pile body and away from the water-cooled gun head, respectively.

[0041] As can be seen from the above description, as the key part of charging, one temperature sensor is arranged at DC+ and DC- of the water-cooled gun head for real-time collection of the charging temperature of the water-cooled gun head, which is accurate. At the same time, as the cable through which the current passes, the cable temperature of the positive cable and the negative cable has a great influence on the charging performance of the charging pile, so temperature sensors are arranged at the positive cable and the negative cable, which not only consider the temperature of the water-cooled gun head, but also consider the temperature of the cable, so as to control the water cooling more intelligently. In addition, on the basis of considering the temperature of the water-cooled gun head and the cable, two temperature sensors are arranged at the environment of the water-cooled gun line except the cable and the water-cooled pipeline, so as to collect and consider the environmental temperature of the water-cooled gun line, and the temperatures of the three places are comprehensively controlled to further control the water cooling, which is more accurate.

[0042] Further, voltage samplers are arranged at DC+ and DC- of the water-cooled gun head and the positive output end and the negative output end of the high-voltage loop, respectively;

[0043] The voltage samplers are in communication connection with the control mainboard, and the high-voltage loop is in control connection with the control mainboard.

[0044] From the above description, the DC+ and DC- of the water-cooled gun head are additionally provided with voltage samplers for real-time collection of the charging voltage at the water-cooled gun head, and the positive and negative output ends of the high-voltage loop in the charging pile body are also provided with voltage samplers for collection of the voltage output by the high-voltage loop, so that the main board can compare the voltages at the high-voltage loop end and the water-cooled gun head end of the positive and negative poles, calculate the line resistance of the positive and negative cables (which will change due to temperature or line aging), further judge the heat generation of the cable, and further control the cooling capacity of the water cooling, and also reduce the capacity or protect the charging pile in time.

[0045] Further, the water-cooled gun head and the water-cooled unit are connected with the control main board in communication and control through the first CAN bus.

[0046] The control main board is connected with the vehicle BMS in communication and control through the second CAN bus.

[0047] From the above description, the CAN bus is used to realize the communication and control between the water-cooled gun head and the water-cooled unit and the control main board, and the CAN bus is also used to realize the communication between the BMS of the vehicle being charged and the control main board, so as to ensure the effectiveness and immediacy of the water-cooled control strategy.

[0048] Further, it further comprises a liquid leakage sensor.

[0049] The liquid leakage sensor is built in the water-cooled gun line and is connected with the control main board in communication, for detecting whether the water-cooled pipeline leaks.

[0050] From the above description, the liquid leakage sensor is added in the water-cooled gun line to detect in real time whether the water-cooled pipeline leaks, so that the control main board can be fed back in time when the liquid leakage occurs, and the control main board can timely issue instructions such as stopping the charging pile and the water-cooled unit, to avoid damage to the charging pile and the charging vehicle in time.

[0051] Further, it further comprises an electronic lock.

[0052] The electronic lock is built in the water-cooled gun head, for locking the water-cooled gun head and the charging socket of the vehicle when the water-cooled gun head charges the vehicle.

[0053] From the above description, the electronic lock is built in the water-cooled gun head to lock the water-cooled gun head in the charging process, so as to prevent personnel from plugging the water-cooled gun head with live wire and causing safety hazards.

[0054] Please refer to Figure 5 and Figure 6The application discloses a water cooling control method of a water-cooled charging pile system, and applies to the water-cooled charging pile system.

[0055] S1, when a vehicle is performing a charging operation, a control mainboard in a pile body of the charging pile acquires a temperature collected by a temperature sensor located at a water-cooled gun head in real time;

[0056] S2, the control mainboard issues corresponding working instructions to a water-cooled unit according to the temperature collected by the temperature sensor and an electric quantity parameter fed back by a vehicle BMS;

[0057] S3, the water-cooled unit receives the working instructions and controls the flow of cooling liquid in a water-cooled pipeline.

[0058] It can be known from the above description that the application has the beneficial effects that, based on the same technical concept, the water-cooled charging pile system is provided by the water-cooled control method of the water-cooled charging pile system, and the safety problem of the high-power charging pile caused by the high temperature of the charging gun head during the charging process is solved, the traditional charging gun head is transformed into the water-cooled gun head, the water-cooled pipeline and the water-cooled gun line are connected with the water-cooled unit and the high-voltage loop in the pile body of the charging pile, the temperature sensor is arranged at the water-cooled gun head, the temperature at the gun head is collected in real time during the charging process of the vehicle and is fed back to the control mainboard of the charging pile, the working instructions are issued to the water-cooled unit by the control mainboard according to the charging temperature of the gun head and the charging electric quantity fed back by the vehicle BMS, the flow of the cooling liquid in the water-cooled pipeline is adjusted in real time by the water-cooled unit, and then the working temperature of the water-cooled gun head is adjusted, so that the safety problem of the high-power charging pile is solved.

[0059] Further, the temperature sensor is arranged at each of the DC+ and the DC- of the water-cooled gun head.

[0060] Further, in the step S2, the control mainboard issues the corresponding working instructions to the water-cooled unit according to the temperature collected by the temperature sensor and the electric quantity parameter fed back by the vehicle BMS, and specifically,

[0061] when the temperature Tdc of the water-cooled gun head DC+ or DC- is less than or equal to 30 DEG C, the control mainboard issues the working instructions to the water-cooled unit to control the water-cooled pipeline to keep in a self-circulation state with low flow;

[0062] When 30℃ < Tdc≤ 45℃ or (△Tdc / △t) < V1 and lasts for 3s, the control mainboard issues a working instruction to the water cooling unit to control the flow F=0.5Fmax of the cooling liquid in the water cooling pipeline, wherein F is the real-time flow of the cooling liquid in the water cooling pipeline, Fmax is the maximum flow of the cooling liquid, △Tdc is the temperature change value of the temperature of the water cooling gun head DC+ or DC- within △t time, and V1 is the first preset temperature rise rate within △t time.

[0063] When 45℃ < Tdc≤ 60℃ or V1 < (△Tdc / △t) < V2 and lasts for 3s, the control mainboard issues a working instruction to the water cooling unit to control the flow F=0.75Fmax of the cooling liquid in the water cooling pipeline, wherein V2 is the second preset temperature rise rate within △t time.

[0064] When 60℃ < Tdc≤ 90℃ or (△Tdc / △t) > V2 and lasts for 3s, the control mainboard issues a working instruction to the water cooling unit to control the flow F=Fmax of the cooling liquid in the water cooling pipeline.

[0065] When the control mainboard receives the feedback of the vehicle BMS that the vehicle battery is fully charged, the control mainboard controls the charging pile to stop charging.

[0066] As can be seen from the above description, as the key part of charging, a temperature sensor is arranged at DC+ and DC- of the water cooling gun head for real-time collection of the charging temperature of the water cooling gun head, and the accuracy is high.

[0067] The application discloses a charging pile system with water cooling and a water cooling control method thereof.

[0068] Please refer to Figure 1 and Figure 4 , the embodiment one of the application is:

[0069] A charging pile system with water cooling, as Figure 1 shown, comprising a pile body 1, a control mainboard 2, a water cooling unit 3, a high-voltage loop 5 and a water cooling gun head 4.

[0070] In this embodiment, the control mainboard 2, the water cooling unit 3 and the high-voltage loop 5 are located in the pile body 1; the water cooling gun head 4 is located outside the pile body 1 and is connected with the water cooling unit 3 and the output end of the high-voltage loop 5 not shown in the figure through a water cooling pipeline 6 and a water cooling gun line 7, and the input end of the high-voltage loop 5 is used to be connected with the commercial power.

[0071] Meanwhile, in this embodiment, a temperature sensor is arranged at the water cooling gun head 4; asFigure 4 As shown in the figure, the water-cooled gun head 4 and the water-cooled unit 3 are both in communication and control connection with the control mainboard 2, and the control mainboard 2 is also used for communication and control connection with the BMS of the vehicle being charged.

[0072] That is, in the embodiment, since the charging gun head of the traditional high-power charging pile often has the problem of temperature being too high during charging, leading to charging safety hazards, the embodiment reforms the traditional charging gun head into a water-cooled gun head 4, connects the water-cooled gun line 7 with the water-cooled unit 3 and the high-voltage loop 5 located in the charging pile body 1 through the water-cooled pipeline 6, and sets a temperature sensor at the water-cooled gun head 4, so as to collect the temperature at the gun head in real time during the charging of the vehicle and feed back to the control mainboard 2 of the charging pile, and then the control mainboard 2 issues a working instruction to the water-cooled unit 3 according to the charging temperature of the gun head and the charging power fed back by the vehicle BMS, so that the water-cooled unit 3 adjusts the flow of the cooling liquid in the water-cooled pipeline 6 in real time, and then adjusts the working temperature of the water-cooled gun head 4, thereby effectively solving the safety problem of the high-power charging pile.

[0073] It is worth mentioning that the water-cooled gun line 7 is a liquid-cooled pipeline integrated in the conventional charging gun line, which extends from the gun head to the inside of the charging pile and is connected with the pipeline of the heat exchanger inside. The existing charging gun line and charging gun head generate high heat when working with large current, and due to the reasons such as the size limitation of the conventional charging line combination cable, the connection position between the charging gun head and the vehicle, etc., it cannot meet the requirement of super-charging power density, and it is necessary to add a heat exchange device inside the cable, so the water-cooled gun line 7 provides a passage for the heat dissipation of the power cable and the connecting terminal inside the charging gun head. The water-cooled gun head 4 is compatible with the interface logic of the current conventional charging gun, and supports the vehicle charging with large current super-charging function.

[0074] In addition, in the embodiment, as shown in Figure 4 the water-cooled gun head 4 and the water-cooled unit 3 are in communication and control connection with the control mainboard 2 through the first CAN bus, and the control mainboard 2 is in communication and control connection with the BMS of the vehicle being charged through the second CAN bus. That is, through the two-way CAN bus, one way is used for communication between the water-cooled gun head 4, the water-cooled unit 3 and the control mainboard 2, and the other way is used for communication between the BMS of the vehicle being charged and the control mainboard 2 of the charging pile, so as to realize the control of each device in the charging pile and the information interaction between the charging pile and the vehicle, and ensure the effectiveness and immediacy of the water-cooled control strategy.

[0075] Please refer to Figure 2 and Figure 3 the second embodiment of the present application is:

[0076] A charging pile system with water cooling, based on the above-mentioned first embodiment, in the embodiment, as shown in Figure 3 the water-cooled gun line 7 includes a positive cable 71 and a negative cable 72.

[0077] Wherein, in the embodiment, the part of the water cooling pipeline 6 outside the pile body 1 is located in the water cooling gun line 7, and the input ends of the positive electrode cable 71 and the negative electrode cable 72 are connected to the positive electrode output end and the negative electrode output end of the high-voltage loop 5 respectively, and the output ends of the positive electrode cable 71 and the negative electrode cable 72 are connected to DC+ and DC- of the water cooling gun head 4 respectively.

[0078] It is worth mentioning that the positive electrode output end and the negative electrode output end of the high-voltage loop 5 are not explicitly marked in the embodiment, and neither are the devices in the high-voltage loop 5. As should be known by those skilled in the art, the positive and negative electrodes of the charging pile will convert the alternating current of the power supply into direct current suitable for electric vehicle charging after rectification, voltage conversion and conversion by the high-voltage loop 5, and then output to the positive electrode cable 71 and the negative electrode cable 72 through the positive electrode output end and the negative electrode output end of the high-voltage loop 5, and then transmit the direct current to DC+ and DC- of the water cooling gun head 4 through the positive electrode cable 71 and the negative electrode cable 72, so as to charge the external electric vehicle. At the same time, in the embodiment, Figure 2 The high-voltage in the high-voltage loop 5 will only display simple components on the positive electrode loop and the negative electrode loop, that is, a shunt is also connected in series in the loop of the positive electrode cable 71 and the charging pile input +, wherein the shunt can be used to collect the current size of the high-voltage loop 5, and by collecting the current size of the high-voltage loop 5, the charging power and the heat generation can be calculated, which provides the basis for the calculation of the controller system strategy; while in the loop of the negative electrode cable 72 and the charging pile input -, a fuse FU is connected in series, which can be fused in time when the high-voltage loop 5 occurs short circuit or leakage, so as to protect the charging pile and the electric vehicle being charged; in addition, a relay K1 and K2 are connected in series in the positive and negative electrode loops, which can be controlled in connection with the control mainboard 2, and the opening and closing state of the contact can be controlled through the control mainboard 2, which can disconnect the charging loop in time when the charging pile occurs abnormity, so as to further protect the charging pile itself and the electric vehicle being charged.

[0079] That is, in the embodiment, the positive electrode cable 71 and the negative electrode cable 72 connected to the positive electrode output end and the negative electrode output end of the high-voltage loop 5 are integrated in the water cooling gun line 7, so that the water cooling gun head 4 and the water cooling gun line 7 outside the pile body 1 form an integrated structure, and at the same time, the water cooling pipeline 6 can adopt FEP heat shrink tube material, which can effectively protect the positive electrode cable 71, the negative electrode cable 72 and the water cooling pipeline 6 outside the pile body 1 while charging the vehicle.

[0080] Wherein, in the embodiment, a temperature sensor is arranged at DC+ and DC- of the water cooling gun head 4 respectively. That is, as the key part of charging, a temperature sensor is arranged at DC+ and DC- of the water cooling gun head 4 respectively for real-time collection of the charging temperature of the water cooling gun head 4, so as to facilitate the accuracy of the water cooling control instruction issued by the control panel to the water cooling unit 3 to control the flow size of the cooling liquid in the water cooling pipeline 6.

[0081] Meanwhile, in the embodiment, the temperature sensors are also arranged at positions where the positive electrode cable 71 and the negative electrode cable 72 are located outside the pile body 1 and away from the water-cooled gun head 4. That is, the positive electrode cable 71 and the negative electrode cable 72 serve as cables through which electric current passes, and the cable temperature has a great influence on the charging performance of the charging pile. Therefore, the temperature sensors are arranged at the positive electrode cable 71 and the negative electrode cable 72, so that the temperature of the water-cooled gun head 4 and the temperature of the cable are considered, and the water cooling is controlled more intelligently.

[0082] In addition, in the embodiment, a pair of temperature sensors are also arranged at positions outside the water-cooled gun cable 7 except the positive electrode cable 71, the negative electrode cable 72 and the water-cooled pipeline 6. That is, on the basis of considering the temperature of the water-cooled gun head 4 and the cable, two temperature sensors are also arranged in the gun cable internal environment 73 except the cable and the water-cooled pipeline 6 in the water-cooled gun cable 7, so that the ambient temperature of the water-cooled gun cable 7 is also collected and considered, and the temperature of three places is comprehensively controlled to further control the water cooling with higher accuracy.

[0083] In summary, in the embodiment, through the 6-way temperature collection of the water-cooled gun cable 7 (2-way gun head terminal temperature at the water-cooled gun head 4 DC+ and DC-, 2-way gun cable temperature at the positive electrode cable 71 and the negative electrode cable 72, and 2-way gun internal environment temperature in the gun cable internal environment 73), under normal circumstances, the gun head terminal temperature > the gun cable temperature > the gun internal environment temperature. The control panel compares the temperatures collected by the temperature collector at different positions to determine whether an abnormality occurs, such as the relationship between each temperature and the abnormal threshold, alarm when the abnormal threshold is exceeded, and whether a charging failure occurs by judging the temperature abnormality of each temperature collection point, so as to provide a basis for the water-cooled unit 3 to control the flow of the cooling liquid in the water-cooled pipeline 6, that is, to increase the flow when the temperature is high, and to decrease the flow when the temperature is low, so that the temperature in the water-cooled gun head 4 is controlled in a constant range or a constant value, and the water cooling control in the effective high-power charging pile charging process is realized.

[0084] Embodiment three of the application is:

[0085] A charging pile system with water cooling, based on the above-mentioned embodiment two, in the embodiment, the voltage samplers are arranged at the DC+ and DC- of the water-cooled gun head 4 and the positive electrode output end and the negative electrode output end of the high-voltage loop 5.

[0086] The voltage samplers are in communication connection with the control mainboard 2, and the high-voltage loop 5 is in control connection with the control mainboard 2.

[0087] That is, in the embodiment, the DC+ and DC- of the water-cooled gun head 4 are additionally provided with voltage samplers in addition to the temperature sensors, for collecting the charging voltage at the water-cooled gun head 4 in real time, and the positive output end and the negative output end of the high-voltage loop 5 in the charging pile body 1 are also provided with voltage samplers, so as to collect the voltage output by the high-voltage loop 5, so that the main board 2 can calculate the line resistance of the positive cable 71 and the negative cable 72 by comparing the voltages at the ends of the high-voltage loop 5 and the water-cooled gun head 4 (the line resistance will change due to temperature or line aging), and can further judge the heat generation of the cable according to the line resistance, so as to further control the cooling capacity of the water cooling, and also can timely reduce the capacity or protect the charging pile.

[0088] Meanwhile, in the embodiment, a liquid leakage sensor is also included, which is built in the water-cooled gun cable 7 and is in communication connection with the control main board 2, so as to detect the liquid leakage of the water-cooled pipeline in real time, so that the control main board 2 can be fed back in time when the liquid leakage occurs, and the control main board can timely issue the stop of the charging pile and the stop of the water-cooled unit 3, so as to timely avoid the damage of the charging pile and the electric vehicle being charged.

[0089] In addition, in the embodiment, an electronic lock is also included, which is built in the water-cooled gun head 4, for locking the water-cooled gun head 4 and the charging socket of the vehicle when the water-cooled gun head 4 is charging the vehicle, so as to prevent the personnel from unplugging the water-cooled gun head 4 under the electrified condition, and bring the safety hidden danger.

[0090] Please refer to Figure 5 and Figure 6 , the fourth embodiment of the application is:

[0091] A water-cooled control method of a charging pile system with water cooling, which adopts the charging pile system with water cooling in the third embodiment, as shown in Figure 5 , including the steps of:

[0092] S1, when the vehicle is charging, the control main board in the charging pile body acquires the temperature collected by the temperature sensor at the water-cooled gun head in real time.

[0093] S2, the control main board issues corresponding working instructions to the water-cooled unit according to the temperature collected by the temperature sensor and the electric quantity parameter fed back by the vehicle BMS.

[0094] S3, the water-cooled unit receives the working instructions and controls the flow of the cooling liquid in the water-cooled pipeline.

[0095] That is, in the present embodiment, based on the same technical concept, a water-cooled charging pile system is provided, and a water-cooled control method of the water-cooled charging pile system is provided. Since the charging gun head of the traditional high-power charging pile often has a problem of temperature being too high during charging, which leads to a charging safety hazard, the present embodiment reforms the traditional charging gun head into a water-cooled gun head, connects the water-cooled gun line and the water-cooled pipeline with the water-cooled unit and the high-voltage loop located in the charging pile body through the water-cooled pipeline and the water-cooled gun line, and sets a temperature sensor at the water-cooled gun head. The temperature at the gun head is collected in real time during the charging of the vehicle, and is fed back to the control mainboard of the charging pile. According to the charging temperature of the gun head and the charging capacity fed back by the vehicle BMS, the control mainboard issues a working instruction to the water-cooled unit. The water-cooled unit adjusts the flow rate of the cooling liquid in the water-cooled pipeline in real time, and then adjusts the working temperature of the water-cooled gun head, so as to effectively solve the safety problem caused by the high-power charging pile.

[0096] As shown in Figure 6 , the present embodiment illustrates a water-cooled control process of a water-cooled charging pile system:

[0097] Firstly, when the vehicle needs to be charged, the water-cooled gun head can be inserted into the socket of the vehicle first, and then the vehicle and the charging pile are connected through CAN, and the charging pile is started.

[0098] The power supply of the charging pile is turned on, and self-checking is performed. If there is no problem, the charging is started. If there is a problem, the fault is reported and the charging pile is stopped.

[0099] Before charging, the control mainboard will first detect the gun insertion signal of the water-cooled gun head. After detecting that the gun insertion is successful, the charging pile can first output current to the BMS of the vehicle to establish communication connection with it. If the BMS cannot interact with the control mainboard of the charging pile, an alarm of BMS communication failure is given, and the charging is stopped.

[0100] After the communication between the charging pile and the BMS is successfully established, the electronic lock of the water-cooled gun head can be started to make the water-cooled gun head in a locked state. The control panel controls the relays K1 and K2 of the high-voltage loop to be closed, and then the charging pile starts to charge the vehicle.

[0101] During the charging process, the BMS feeds back the charging capacity of the battery to the control mainboard in real time. At the same time, the temperature collector also collects the temperature of each collection point in the water-cooled gun head in real time, and feeds back to the control mainboard.

[0102] As shown in Figure 6 , taking the temperature at DC+ and DC- of the water-cooled gun head as an example:

[0103] When the temperature Tdc of the water-cooled gun head DC+ or DC- is ≤30℃, the water-cooling unit controls the water-cooling pipeline to keep a low-flow self-circulation state; when 30℃<Tdc≤45℃ or (△Tdc / △t)<V1 and lasts for 3s, the water-cooling unit controls the cooling liquid flow F=0.5Fmax in the water-cooling pipeline, wherein F is the real-time flow of the cooling liquid in the water-cooling pipeline, Fmax is the maximum flow of the cooling liquid, △Tdc is the temperature change value of the water-cooled gun head DC+ or DC- within △t time, V1 is the first preset temperature rise rate within △t time; when 45℃<Tdc≤60℃ or V1< (△Tdc / △t)<V2 and lasts for 3s, the water-cooling unit controls the cooling liquid flow F=0.75Fmax, wherein V2 is the second preset temperature rise rate within △t time; when 60℃<Tdc≤90℃ or (△Tdc / △t)>V2 and lasts for 3s, control F=Fmax.

[0104] Taking the temperature of the water-cooled gun head in combination with the environmental temperature Te in the gun wire and the cable resistance Rdcc as an example:

[0105] When 90℃<Tdc≤100℃ or 80℃<Te≤85℃ or Rdcc≥Rmax, the water-cooling unit controls the cooling liquid flow F=Fmax in the water-cooling pipeline, and reduces the charging power to 50%, wherein Rmax is the maximum value of the internal resistance of the positive electrode cable and the negative electrode cable.

[0106] Taking the temperature of the water-cooled gun head in combination with the cable temperature Tdcc and the environmental temperature Te in the gun wire as an example:

[0107] When Tdc>100℃ or Te>85℃ or Tdcc-Tdc>5℃ or Te>Tdcc or |T DC+ - DC |>20℃, stop charging and report a fault, wherein T DC+ is the temperature at DC+ of the water-cooled gun head, T DC- is the temperature at DC- of the water-cooled gun head.

[0108] When the liquid leakage sensor detects that the water-cooled gun head has liquid leakage, stop charging and report a fault.

[0109] Finally, the last control mainboard judges whether the charging is completed according to the electric quantity of the vehicle battery fed back by the BMS, and if yes, stops charging, disconnects the high-voltage loop, and the electronic lock is in the contact locking state, the water-cooled gun head is pulled out, and the next charging is waited.

[0110] In summary, the water-cooled charging pile system and the water-cooling control method thereof provided by the application have the following beneficial effects:

[0111] 1. The water cooling control method of the charging pile system makes the use of high-power charging piles with water cooling and the use of large current safer, and provides a feasible solution for the current charging current from 250A to 500A.

[0112] 2. The constant temperature control method is adopted, the cooling liquid flow is feedback adjusted through the collection of the main temperature point before the abnormal threshold is reached, so as to stabilize the temperature of the water cooling gun head at a point, fully exert the power of the charging pile, and minimize the charging time at the allowable temperature.

[0113] 3. The above strategy can not only be used for single pile single gun charging pile, but also be used for single pile double gun or single pile multiple gun, and the water cooling pipes between each water cooling gun line and the water cooling unit are independent and can be controlled independently. The mainboard of the charging pile collects the temperature, water cooling pipe flow and other parameter values of each single loop gun line, the safety protection strategy can be universal, each water cooling pipe can be independently controlled and operated, the number of charging piles and mainboards can be reduced, the cost can be reduced, the cost of the cooling unit of the liquid cooling pile and the charging pile of the station can be reduced, the occupation can be reduced, a new idea is provided for the construction of a charging station, and the construction cost is reduced.

[0114] 4. In addition to collecting temperature, the voltage on the cable in the water cooling gun head can also be collected, compared with the voltage of the high-voltage loop output end, the cable resistance is calculated, when the resistance reaches a certain value, it is judged that the line heat exceeds the cooling capacity, so as to reduce the capacity or protect in time.

[0115] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, any equivalent transformation or direct or indirect application in related technical fields by using the content of the specification and drawings of the present application is also included in the patent protection range of the present application.

Claims

1. A water cooling control method of a water-cooled charging pile system, characterized by, The charging pile system includes a charging pile body, a control main board, a water-cooled unit, a high-voltage circuit, and a water-cooled charging nozzle. The control main board, the water-cooled unit, and the high-voltage circuit are all located inside the charging pile body. The water-cooled charging nozzle is located outside the charging pile body and is connected to the output terminals of the water-cooled unit and the high-voltage circuit respectively through water-cooled pipes and water-cooled gun wires. The input terminal of the high-voltage circuit is used to connect to the mains power. A temperature sensor is installed at the water-cooled charging nozzle, with one temperature sensor at each of the DC+ and DC- terminals. Both the water-cooled charging nozzle and the water-cooled unit are connected to the control main board for communication and control. The control main board is used for communication and control with the vehicle's BMS. Including the following steps: S1. When the vehicle is charging, the control board inside the charging pile obtains the temperature from the temperature sensor located at the water-cooled gun head in real time. S2. The control motherboard sends corresponding operating instructions to the water-cooled unit based on the temperature collected by the temperature sensor and the power parameters fed back by the vehicle BMS. S3. The water-cooled unit receives the working command and controls the flow rate of the coolant in the water-cooled pipeline. In step S2, the control motherboard issues corresponding operating instructions to the water-cooled unit based on the temperature collected by the temperature sensor and the power parameters fed back by the vehicle BMS. Specifically: When the temperature Tdc of the DC+ or DC- of the water-cooling nozzle is ≤30℃, the control motherboard sends a working instruction to the water-cooling unit to control the water-cooling pipeline to maintain a low-flow self-circulation state. When 30℃<Tdc≤45℃ or (△Tdc / △t)<V1 and lasts for 3s, the control motherboard sends a working instruction to the water-cooled unit to control the coolant flow rate F=0.5Fmax in the water-cooled pipeline, where F is the real-time flow rate of the coolant in the water-cooled pipeline, Fmax is the maximum flow rate of the coolant, △Tdc is the temperature change value of the DC+ or DC- of the water-cooling nozzle within △t time, and V1 is the first preset temperature rise rate within △t time. When 45℃<Tdc≤60℃ or V1<(△Tdc / △t)<V2 and this continues for 3s, the control motherboard sends a working instruction to the water-cooled unit to control the flow rate of the coolant in the water-cooled pipeline F=0.75Fmax, where V2 is the second preset temperature rise rate within the time △t. When 60℃<Tdc≤90℃ or (△Tdc / △t)>V2 and lasts for 3s, the control motherboard sends a working command to the water-cooled unit to control the flow rate of the coolant in the water-cooled pipeline F=Fmax. When the control motherboard receives feedback from the vehicle's BMS that the vehicle battery is fully charged, it controls the charging station to stop charging.

2. The water cooling control method of the charging pile system with water cooling according to claim 1, characterized in that, The water-cooled gun cable includes a positive cable and a negative cable; The portion of the water-cooled pipeline located outside the pile body is located inside the water-cooled gun line; The input terminals of the positive and negative cables are respectively connected to the positive and negative output terminals of the high-voltage circuit. The output ends of the positive and negative cables are respectively connected to the DC+ and DC- of the water-cooling nozzle.

3. The water-cooling control method for a water-cooled charging pile system according to claim 2, characterized in that, The positive electrode cable and the negative electrode cable are each provided with a temperature sensor at a position outside the pile body and away from the water-cooling gun head; A pair of temperature sensors are disposed opposite each other in the water-cooled gun line, except for the positive cable, the negative cable and the water-cooling pipeline.

4. The water-cooling control method for a water-cooled charging pile system according to claim 2, characterized in that, Voltage samplers are provided at the DC+ and DC- terminals of the water-cooled gun head, as well as at the positive and negative output terminals of the high-voltage circuit. The voltage sampler is communicatively connected to the control motherboard, and the high-voltage circuit is controlled by the control motherboard.

5. The water-cooling control method for a water-cooled charging pile system according to claim 1, characterized in that, The water-cooling nozzle and the water-cooling unit communicate and are connected to the control motherboard via the first CAN bus. The control board is used for communication and control connection with the vehicle BMS via the second CAN bus.

6. The water-cooling control method for a water-cooled charging pile system according to claim 1, characterized in that, It also includes a leak sensor; The leakage sensor is built into the water-cooling gun line and communicates with the control motherboard to detect whether leakage has occurred in the water-cooling pipeline.

7. The water-cooling control method for a water-cooled charging pile system according to claim 1, characterized in that, It also includes electronic locks; The electronic lock is built into the water-cooling nozzle and is used to lock the water-cooling nozzle to the vehicle's charging socket when the water-cooling nozzle is charging the vehicle.

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