Intelligent direct-current charging pile with fault judgment function and charging method of intelligent direct-current charging pile

Abstract

The invention relates to the field of charging piles, and discloses an intelligent direct-current charging pile with a fault judgment function and a charging method thereof.The intelligent direct-current charging pile comprises a direct-current charging pile body and a charging cable, the rear side wall of the direct-current charging pile body is fixedly connected with a cover plate, and a take-up and pay-off assembly is installed in the cover plate; the take-up and pay-off assembly comprises a plurality of upper column bodies and lower column bodies which are distributed in a crossed mode, one end of each upper column body is fixedly installed on the upper side wall of the direct current charging pile body, a balance weight sliding block is fixedly installed and connected to one end of each lower column body, and the balance weight sliding blocks are slidably connected with the direct current charging pile body in the vertical direction. And the charging cable is wound and passes through the lower column body and the upper column body in sequence. The lower column body is driven by the gravity of the counterweight sliding block to slide downwards, and the charging cable is pulled by the lower column body to be distributed in a snake shape, so that the charging cable is stored in the cover plate, and compared with a winding storage mode in the prior art, the charging cable can be effectively prevented from being wound and distributed unevenly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging piles, in particular to an intelligent direct-current charging pile with fault judgment and a charging method thereof. BACKGROUND

[0002] The charging pile is similar in function to the oil dispenser in the gas station, can be fixed on the ground or wall, installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations, can charge various types of electric vehicles according to different voltage levels, the input end of the charging pile is directly connected with the AC power grid, and the output end is provided with a charging plug for charging electric vehicles. The charging pile generally provides two charging modes of conventional charging and fast charging. People can use a specific charging card to swipe on the human-computer interaction operation interface provided by the charging pile, and perform corresponding operations such as charging mode, charging time, and fee data printing. The charging pile display screen can display charging capacity, cost, charging time and other data.

[0003] The charging gun matched with the charging pile provided by the prior art is of an external hanging type, the charging cable between the charging gun and the charging pile body is arranged outside the charging pile body, and the user needs to manually hang the charging gun outside the charging pile body after completing charging. The charging pile is internally provided with a take-up roller, the take-up roller rotates along a central connecting shaft, and drags the charging cable to be wound on the roller shaft. In the process of being dragged and wound, the charging cable is prone to be concentratedly wound on one end of the take-up roller shaft due to small change in the trend of movement, thereby causing uneven distribution of the charging cable winding. SUMMARY

[0004] The present application provides an intelligent direct-current charging pile with fault judgment and a charging method thereof, which solves the problem of uneven distribution of the charging cable winding in the process of being dragged and wound.

[0005] To achieve the above object, the present application is implemented by the following technical scheme: an intelligent direct-current charging pile with fault judgment and a charging method thereof, comprising a direct-current charging pile body and a charging cable, the rear side wall of the direct-current charging pile body is fixedly connected with a cover plate, the cover plate is internally provided with a take-up and pay-off assembly, the take-up and pay-off assembly comprises a plurality of upper columns and lower columns which are cross-distributed, one end of the upper column is fixedly installed on the upper side wall of the direct-current charging pile body, one end of the lower column is fixedly installed and connected with a counterweight sliding block, the counterweight sliding block is slidingly connected with the direct-current charging pile body in the vertical direction, the charging cable is sequentially wound through the lower column and the upper column, one end of the charging cable penetrates the inside of the direct-current charging pile body, and the other end of the charging cable penetrates the cover plate and is electrically connected with the charging gun.

[0006] By adopting the technical scheme, the bottom of the counterweight sliding block is fixedly provided with a pressure sensor, the pressure sensor is electrically connected with the charging pile control system, the counterweight sliding block extrudes the pressure sensor when sliding to the bottom to generate a pressure signal, and the position of the counterweight sliding block is detected to detect the sliding position of the counterweight sliding block when the wire is reeled in.

[0007] Preferably, the lower column body comprises a cylinder body, a convex channel is formed in the inside of the cylinder body, a T-shaped limiting column is slidably connected in the inside of the channel, an elastic member is sleeved on the area of the limiting column in the inside of the cylinder body, and a magnetic ring is fixedly connected to one end of the limiting column outside the cylinder body.

[0008] Preferably, the take-up and pay-off assembly further comprises a cross slide, the cross slide is fixedly installed on the inner side wall of the cover plate, a U-shaped mounting bracket is fixedly connected to the side wall of the horizontal sliding seat of the cross slide, a plurality of limiting holes are formed in the surface of the mounting bracket and correspond to the movement track of the lower column body, an adsorption ring made of ferromagnetic material is fixedly connected in the inside of the limiting hole, and a magnetic block is fixedly connected to the side wall of the sliding block of the cross slide sliding in the horizontal direction.

[0009] Preferably, a cable support table is fixedly connected to the outer side wall of the horizontal sliding seat of the cross slide, and a notch is formed in the surface of the cable support table and corresponds to the movement track of the lower column body.

[0010] Preferably, the take-up and pay-off assembly further comprises an upper conveying wheel, a lower conveying wheel and a driving member, the upper conveying wheel and the lower conveying wheel are respectively rotatably installed on the outer side wall of the cover plate, the charging cable passes through the gap between the upper conveying wheel and the lower conveying wheel, and the driving member is used to drive the lower conveying wheel to rotate.

[0011] Preferably, the driving member comprises a high-pressure air pump, the high-pressure air pump is fixedly installed on the inner side wall of the cover plate, a gas guide pipe is fixedly connected to the gas inlet end of the high-pressure air pump, an opening is formed in the center of the lower conveying wheel, one end of the lower conveying wheel is rotatably communicated with the gas guide pipe through a rotary joint, and an impeller is fixedly connected in the inside of the opening.

[0012] Preferably, an annular groove is formed in the surface of the lower conveying wheel, an annular air bag is fixedly connected in the inside of the groove, a separation layer is fixedly connected to the center of the opening, an air inlet channel and an air outlet channel are formed in the inside of the lower conveying wheel, the air inlet channel is used to connect the air inlet end of the opening and the air bag, and the air outlet channel is used to connect the air outlet end of the opening and the air bag.

[0013] Preferably, a cleaning assembly is mounted outside the charging cable, the cleaning assembly comprising a ring-shaped nozzle and a gas conveying member, the nozzle being sleeved outside the charging cable, and a fixed frame being fixedly connected to the outer sidewall of the nozzle, two ends of the fixed frame being fixedly connected to a cover plate, the gas conveying member being used for connecting the nozzle and a gas guide pipe, the gas conveying member comprising a branch pipe, the branch pipe being fixedly arranged on the surface of the gas guide pipe and being in communication with the gas guide pipe, a trapezoidal sealing column being slidably connected to the inside of the branch pipe, a gas guide channel being formed in the inside of the sealing column, and a gas conveying pipe being fixedly connected between the bottom end of the gas guide channel and the gas inlet end of the nozzle.

[0014] Preferably, the direct-current charging pile body comprises a main control module, a charging module, a fault detection module, a communication module, a display module and a power module; the fault detection module comprises a voltage detection unit, a current detection unit, a temperature detection unit and an insulation resistance detection unit, and is used for collecting voltage, current, temperature and insulation resistance data of a charging loop and key components in real time and transmitting the data to the main control module; the main control module is internally provided with a fault judgment algorithm, the algorithm compares the real-time collected data with preset normal threshold ranges of voltage, current, temperature and insulation resistance, judges whether overvoltage, overcurrent, overheating or insulation fault exists, and according to the fault severity, divides the fault into an emergency fault and a general fault, immediately controls the charging module to stop charging and sends an emergency alarm when the emergency fault occurs, and reduces the charging current and voltage to a safe range and sends a fault prompt when the general fault occurs.

[0015] A charging method of an intelligent direct-current charging pile with fault judgment,

[0016] S1, after the charging gun is connected, the display module prompts success, and the user initiates a charging request;

[0017] S2, the main control module controls the fault detection module to perform initial detection, judges whether there is a fault, and if not, starts charging, and if yes, prohibits charging and prompts;

[0018] S3, in the charging process, the fault detection module collects data in real time, the main control module continuously judges faults, and according to battery SOC and temperature information fed back by the electric vehicle BMS, adopts a three-stage dynamic adjustment of constant current (SOC < 30%), constant voltage (30%≤SOC≤80%) and trickle current (SOC > 80%) to adjust the output voltage and current of the charging module;

[0019] S4, when a full-battery signal is received or the user stops the request, the charging is stopped and charging data is displayed.

[0020] The application provides an intelligent direct-current charging pile with fault judgment and a charging method thereof.

[0021] 1. The application drives the lower column to slide downward by the gravity of the counterweight slider, and the lower column pulls the charging cable to be distributed in a snake shape, so that the charging cable is stored inside the cover plate, compared with the winding storage mode of the prior art, which can effectively avoid uneven distribution of the charging cable.

[0022] 2. The application drives the counterweight slider to rise by the cross slide, so as to offset the gravity of the counterweight slider on the charging cable, and disperse the gravity of the drooping cable on the cable support table, which is more convenient to pull out the charging cable.

[0023] 3. The application drives the lower conveying wheel to rotate forward by the driving piece, and the lower conveying wheel pulls out the charging cable outward by the friction force when rotating, without manual pulling of the charging cable, which is convenient to use.

[0024] 4. The application can accurately and quickly identify faults through multi-dimensional fault detection and hierarchical processing, solve the problem of traditional charging pile alarm lag, greatly improve the charging safety; based on the battery BMS information, adopt three-stage dynamic charging, consider charging efficiency and battery life, and adapt to mainstream batteries. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the application;

[0026] Figure 2 It is a cover plate cross section schematic view of the application;

[0027] Figure 3 It is a wire winding and unwinding assembly structure schematic view of the application;

[0028] Figure 4 It is a lower column structure schematic view of the application;

[0029] Figure 5 It is a lower column cross section schematic view of the application;

[0030] Figure 6 It is a cable support table structure schematic view of the application;

[0031] Figure 7 It is an upper conveying wheel and lower conveying wheel schematic view of the application;

[0032] Figure 8 It is a lower conveying wheel cross section schematic view of the application;

[0033] Figure 9 It is a cleaning assembly structure schematic view of the application.

[0034] 1, direct current charging pile main body; 2, charging cable; 3, cover plate; 4, winding and unwinding assembly; 401, upper column body; 402, lower column body; 403, counterweight sliding block; 404, cross sliding table; 405, mounting frame; 406, adsorption ring; 407, magnetic block; 408, cable support table; 412, upper conveying wheel; 413, lower conveying wheel; 414, driving piece; 415, hole; 416, impeller; 417, air bag; 418, air inlet channel; 419, air outlet channel; 421, limiting hole; 4021, cylinder; 4022, limiting column; 4023, elastic piece; 4024, magnetic ring; 4141, high-pressure air pump; 4142, air guide pipe; 5, cleaning assembly; 51, nozzle; 52, fixing frame; 53, gas conveying piece; 531, branch pipe; 532, sealing column; 533, air guide channel; 534, gas conveying pipe. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below with reference to the drawings in the specification. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] Embodiment one, please refer to the attached Figures 1-4 The present application provides a kind of intelligent direct current charging pile with fault judgment, including direct current charging pile main body 1 and charging cable 2, the rear side wall of direct current charging pile main body 1 is fixedly connected with cover plate 3, cover plate 3 inside is installed with winding and unwinding assembly 4, winding and unwinding assembly 4 includes several upper column bodies 401 and lower column bodies 402 distributed in cross, one end of upper column body 401 is fixedly installed in the upper side wall of direct current charging pile main body 1, one end of lower column body 402 is fixedly installed and connected with counterweight sliding block 403, counterweight sliding block 403 is slidably connected with direct current charging pile main body 1 along vertical direction, charging cable 2 is sequentially wound through lower column body 402 and upper column body 401, one end of charging cable 2 penetrates inside direct current charging pile main body 1, and the other end of charging cable 2 penetrates cover plate 3 and is electrically connected with charging gun.

[0037] Specifically, install when charging cable 2 sequentially through lower column body 402 and upper column body 401, lower column body 402 is slid down by the gravity of counterweight sliding block 403, lower column body 402 pulls charging cable 2 to be distributed in serpentine, so that charging cable 2 is stored in cover plate 3 inside, when charging gun is needed, pull out charging cable 2 by pulling charging cable 2 and pulling lower column body 402 to rise, charging cable 2 can be pulled out, it is convenient to use, and compared with the winding storage mode of prior art, the present device can effectively avoid uneven distribution of charging cable 2 by pulling charging cable to be distributed in serpentine by upper column body 401 and lower column body 402 and storing in cover plate 3 inside.

[0038] Embodiment two, please refer to the attached Figures 4-5 Because the counterweight slider 403 exerts a downward pulling force on the charging cable 2 and the charging cable 2 sags, it is difficult to pull out the charging cable 2, so the embodiment provides the following technical solutions to solve the above problems. The lower column body 402 includes a cylinder body 4021, a convex channel is formed in the inside of the cylinder body 4021, a T-shaped limiting column 4022 is slidably connected inside the channel, an elastic member 4023 is sleeved on the area of the limiting column 4022 inside the cylinder body 4021, one end of the limiting column 4022 outside the cylinder body 4021 is fixedly connected with a magnetic ring 4024, the winding and unwinding assembly 4 further includes a cross slide 404 electrically connected with the charging pile control system, fixedly installed on the inner side wall of the cover plate 3, a U-shaped mounting bracket 405 is fixedly connected on the horizontal direction slide seat side wall of the cross slide 404, a plurality of limiting holes 421 are formed on the surface of the mounting bracket 405 and correspond to the movement track of the lower column body 402, a ferromagnetic material made adsorption ring 406 is fixedly connected inside the limiting hole 421, a magnetic block 407 is fixedly connected on the slide block side wall of the cross slide 404 sliding in the horizontal direction, and the opposite faces of the magnetic block 407 and the magnetic ring 4024 repel each other.

[0039] Specifically, the elastic member 4023 is used to apply an elastic force to the limiting column 4022 to slide and accommodate it into the inner barrel 4021, the magnetic ring 4024 is used to drive the limiting column 4022 to slide outward and insert into the limiting hole 421 by the suction force of the adsorption ring 406, thereby achieving the plug-in cooperation between the lower column 402 and the mounting frame 405, and the cross slide 404 is controlled to operate by the charging pile control system after the user initiates a charging request, the mounting frame 405 is driven to rise by the cross slide 404, and the counterweight sliding block 403 is pulled up by the lower column 402, thereby offsetting the gravity of the counterweight sliding block 403 on the charging cable 2, and the charging cable 2 is more convenient to pull out, and when the charging is completed and the charging cable 2 needs to be accommodated, the magnetic block 407 is driven to move transversely by the cross slide 404, and the magnetic block 407 passes through the limiting hole 421 after a certain time interval and the pressure sensor detects a pressure signal, the limiting column 4022 slides into the inner barrel 4021 by the magnetic repulsion of the magnetic ring 4024, thereby canceling the plug-in cooperation between the lower column 402 and the mounting frame 405, and the plurality of counterweight sliding blocks 403 are sequentially lowered from left to right to pull the charging cable 2 to be accommodated into the cover plate 3, and after the magnetic block 407 passes through all the limiting holes 421, the cross slide 404 is controlled to move transversely to restore to the original position, the mounting frame 405 is driven to descend to correspond to the lower column 402 that is moved to the lower side, and the lower column 402 is again plug-in cooperated with the mounting frame 405 by the magnetic force of the adsorption ring 406 and the magnetic ring 4024, thereby achieving the effect of automatically connecting and separating the lower column 402 and the mounting frame 405, and avoiding the interference between the plurality of lower columns 402 when they move downward to pull the charging cable 2.

[0040] Please refer to the accompanying drawings Figure 6 The outer side wall of the cross slide 404 is fixedly connected with the cable support table 408, and the surface of the cable support table 408 is provided with a notch corresponding to the movement track of the lower column 402, and the notch is used for the lower column 402 to pass through the cable support table 408 when it slides downward.

[0041] Specifically, the cable support table 408 is used to bear the drooping charging cable 2, and the drooping charging cable 2 is lifted synchronously when the mounting frame 405 is lifted, so that the gravity of the drooping charging cable 2 is dispersed on the cable support table 408, thereby making it more convenient to pull out the charging cable 2.

[0042] Please refer to the accompanying drawings Figures 7-8 The winding and unwinding assembly 4 further comprises an upper conveying wheel 412, a lower conveying wheel 413 and a driving member 414, the upper conveying wheel 412 and the lower conveying wheel 413 are respectively rotatably installed on the outer side wall of the cover plate 3, the charging cable 2 passes through the gap between the upper conveying wheel 412 and the lower conveying wheel 413, and the driving member 414 is used to drive the lower conveying wheel 413 to rotate.

[0043] Specific, when the wire is pulled out, the lower conveying wheel 413 is driven to rotate forward by the driving member 414, and the lower conveying wheel 413 is pulled out outward by the friction with the charging cable 2, so that the charging cable 2 is conveniently pulled out without manual pulling.

[0044] Please refer to the accompanying drawings Figure 8 The driving member 414 comprises a high-pressure air pump 4141 electrically connected with the charging pile control system, the high-pressure air pump 4141 is fixedly installed on the inner side wall of the cover plate 3, the gas delivery end of the high-pressure air pump 4141 is fixedly connected with a gas guide pipe 4142, the center of the lower conveying wheel 413 is provided with an opening 415, one end of the lower conveying wheel 413 is in rotational communication with the gas guide pipe 4142 through a rotary joint, and the inside of the opening 415 is fixedly connected with an impeller 416.

[0045] Specifically, the high-pressure air pump 4141 is operated to deliver gas into the opening 415 through the gas guide pipe 4142, and the gas drives the lower conveying wheel 413 to rotate when passing through the impeller 416.

[0046] Please refer to the accompanying drawings Figure 8 The surface of the lower conveying wheel 413 is provided with an annular groove, the annular groove is fixedly connected with an annular air bag 417, the outer surface of the air bag 417 is provided with rough textures for increasing the friction, the center of the opening 415 is fixedly connected with a partition layer, the inside of the lower conveying wheel 413 is provided with an air inlet channel 418 and an air outlet channel 419, the air inlet channel 418 is used to connect the air inlet end of the opening 415 and the air bag 417, the air outlet channel 419 is used to connect the air outlet end of the opening 415 and the air bag 417, and the minimum distance between the lower conveying wheel 413 and the upper conveying wheel 412 is slightly greater than the diameter of the charging cable 2.

[0047] Specifically, the opening 415 is disconnected by the partition layer to form two channels in front and back, the airflow enters the air bag 417 through the air inlet channel 418 when passing through the front channel of the opening 415, and is discharged after entering the rear channel of the opening 415 through the air outlet channel 419, the air bag 417 is inflated and expanded after being filled with air, so as to tightly fit the charging cable 2, thereby increasing the friction with the charging cable 2 and providing the conveying effect of the charging cable 2, and when the wire is retracted, the high-pressure air pump 4141 stops running to make the rear air bag 417 contract, so as not to tightly fit the charging cable 2, thereby reducing the friction between the charging cable 2 and the charging cable 2, and making it more convenient to store the charging cable 2.

[0048] Please refer to the accompanying drawings Figures 7-9 The charging cable 2 is provided with a cleaning assembly 5 outside, the cleaning assembly 5 comprises an annular nozzle 51 and a gas delivery member 53, the nozzle 51 is sleeved outside the charging cable 2, the outer side wall of the nozzle 51 is fixedly connected with a fixing frame 52, the two ends of the fixing frame 52 are fixedly connected with the cover plate 3, and the gas delivery member 53 is used to connect the nozzle 51 and the gas guide pipe 4142.

[0049] Specifically, when winding, the airflow in the air guide pipe 4142 enters the nozzle 51 through the gas conveying part 53, and the high-pressure gas is sprayed out of the nozzle 51 to blow the impurities on the surface of the charging cable 2, thereby achieving the effect of automatically cleaning the charging cable 2.

[0050] Please refer to the attached drawings Figure 9 The gas conveying part 53 includes a branch pipe 531 fixedly arranged on the surface of the air guide pipe 4142 and in communication with the air guide pipe 4142. The branch pipe 531 is slidably connected with a trapezoidal sealing column 532. The sealing column 532 includes a piston block and a piston rod. A gas guide channel 533 is arranged in the sealing column 532. A gas conveying pipe 534 is fixedly connected between the bottom end of the gas guide channel 533 and the gas inlet end of the nozzle 51.

[0051] Specifically, when winding, the mounting frame 405 rises to the lower side of the sealing column 532, and the sealing column 532 slides downward under the action of gravity, thereby opening the air guide pipe 4142, so that the airflow drives the lower conveying wheel 413 to rotate for winding. When winding, the mounting frame 405 is driven to rise again by the cross slide 404, and the sealing column 532 is pushed to slide upward to block the air guide pipe 4142. The airflow generated by the high-pressure air pump 4141 enters the nozzle 51 through the gas guide channel 533 and the gas conveying pipe 534 to clean the charging cable 2.

[0052] The working principle is that when installing, the charging cable 2 is sequentially arranged through the lower column body 402 and the upper column body 401. The lower column body 402 is driven to slide downward by the gravity of the counterweight sliding block 403, and the charging cable 2 is pulled to be arranged in a snake shape, so that the charging cable 2 is arranged in the cover plate 3. When the charging gun is needed, the charging pile control system controls the cross slide 404 to operate after the user initiates a charging request. The cross slide 404 drives the mounting frame 405 to rise, and the counterweight sliding block 403 is pulled to rise through the lower column body 402, thereby offsetting the gravity applied by the counterweight sliding block 403 to the charging cable 2, so that the charging cable 2 is more convenient to pull out. When the charging is completed and the charging cable 2 needs to be arranged, the cross slide 404 drives the magnetic block 407 to move transversely and sequentially pass through the limiting holes 421 at intervals. When the magnetic block 407 passes through the limiting holes 421, the limiting column 4022 is slid to the inside of the barrel 4021 through the magnetic repulsive force of the magnetic ring 4024, thereby canceling the insertion of the lower column body 402 and the mounting frame 405, so that the plurality of counterweight sliding blocks 403 sequentially slide downward from left to right to pull the charging cable 2 to be arranged in the cover plate 3. After the magnetic block 407 passes through all the limiting holes 421, the cross slide 404 controls the adsorption ring 406 to move transversely to restore to the original position, drives the mounting frame 405 to descend to correspond to the lower column body 402 that slides to the lower side, and again inserts and cooperates the lower column body 402 and the mounting frame 405 through the magnetic force of the adsorption ring 406 and the magnetic ring 4024, thereby achieving the effects of automatically connecting and separating the lower column body 402 and the mounting frame 405.

[0053] When the wire is unwound, the high-pressure air pump 4141 is operated and air is delivered into the opening 415 by the air guide pipe 4142, and the air drives the lower conveying wheel 413 to rotate when passing through the impeller 416. The lower conveying wheel 413 is pulled outwards by the friction with the charging cable 2 when rotating, and the charging cable 2 is pulled out without manual pulling, which is convenient to use. When the air flows through the front passage of the opening 415, it enters the air bag 417 through the air inlet passage 418, and is discharged after entering the rear passage of the opening 415 through the air outlet passage 419. The air bag 417 is inflated and expanded after being filled with air, and can tightly fit the charging cable 2, thereby increasing the friction with the charging cable 2 and providing the conveying effect on the charging cable 2. When the wire is wound, the high-pressure air pump 4141 is stopped, and the rear air bag 417 is contracted, so that it does not tightly fit the charging cable 2, thereby reducing the friction with the charging cable 2 and making it more convenient to store the charging cable 2.

[0054] When the wire is wound, the air flow in the air guide pipe 4142 enters the nozzle 51 through the air conveying member 53, and high-pressure air is sprayed out of the nozzle 51 to blow the impurities on the surface of the charging cable 2, thereby achieving the effect of automatically cleaning the charging cable 2.

[0055] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An intelligent direct current charging pile with fault judgment, comprising a direct current charging pile body (1) and a charging cable (2), characterized in that, The rear side wall of the direct current charging pile body (1) is fixedly connected with a cover plate (3), the inside of the cover plate (3) is provided with a winding and unwinding assembly (4), the winding and unwinding assembly (4) comprises a plurality of upper column bodies (401) and lower column bodies (402) which are cross-distributed, one end of the upper column body (401) is fixedly installed on the upper side wall of the direct current charging pile body (1), one end of the lower column body (402) is fixedly connected with a counterweight sliding block (403), the counterweight sliding block (403) is slidably connected with the direct current charging pile body (1) in the vertical direction, the charging cable (2) is wound through the lower column body (402) and the upper column body (401) in sequence, one end of the charging cable (2) penetrates through the inside of the direct current charging pile body (1), and the other end of the charging cable (2) penetrates through the cover plate (3) and is electrically connected with the charging gun. 2.The intelligent direct-current charging pile with fault judgment of claim 1, wherein The lower column body (402) comprises a cylinder body (4021), a convex channel is formed in the inside of the cylinder body (4021), a T-shaped limiting column (4022) is slidably connected in the inside of the channel, an elastic member (4023) is sleeved on the area of the limiting column (4022) in the inside of the cylinder body (4021), and a magnetic ring (4024) is fixedly connected to one end of the limiting column (4022) outside the cylinder body (4021). 3.The intelligent direct-current charging pile with fault judgment of claim 1, wherein The winding and unwinding assembly (4) further comprises a cross sliding table (404) which is fixedly installed on the inner side wall of the cover plate (3), a U-shaped mounting rack (405) is fixedly connected to the horizontal sliding seat side wall of the cross sliding table (404), a plurality of limiting holes (421) are formed in the surface of the mounting rack (405) and correspond to the movement track of the lower column body (402), an adsorption ring (406) made of ferromagnetic material is fixedly connected in the limiting hole (421), and a magnetic block (407) is fixedly connected to the horizontal sliding block side wall of the cross sliding table (404).

4. The intelligent direct-current charging pile with fault judgment according to claim 3, characterized in that, A cable supporting table (408) is fixedly connected to the horizontal sliding seat outer side wall of the cross sliding table (404), and a notch is formed in the surface of the cable supporting table (408) and corresponds to the movement track of the lower column body (402).

5. The intelligent direct-current charging pile with fault judgment according to claim 1, characterized in that, The winding and unwinding assembly (4) further comprises an upper conveying wheel (412), a lower conveying wheel (413) and a driving member (414), the upper conveying wheel (412) and the lower conveying wheel (413) are rotatably installed on the outer side wall of the cover plate (3), the charging cable (2) passes through the gap between the upper conveying wheel (412) and the lower conveying wheel (413), and the driving member (414) is used for driving the lower conveying wheel (413) to rotate. 6.The intelligent direct-current charging pile with fault judgment of claim 5, wherein The driving member (414) comprises a high-pressure air pump (4141), the high-pressure air pump (4141) is fixedly installed on the inner side wall of the cover plate (3), a gas guide pipe (4142) is fixedly connected to the gas inlet of the high-pressure air pump (4141), an opening (415) is formed in the center of the lower conveying wheel (413), one end of the lower conveying wheel (413) is rotatably communicated with the gas guide pipe (4142) through a rotary joint, and an impeller (416) is fixedly connected in the opening (415).

7. The intelligent direct-current charging pile with fault judgment according to claim 6, characterized in that, The surface of the lower conveying wheel (413) is provided with an annular groove, the inside of the groove is fixedly connected with an annular air bag (417), the center of the opening (415) is fixedly connected with a separation layer, the inside of the lower conveying wheel (413) is provided with an air inlet channel (418) and an air outlet channel (419), the air inlet channel (418) is used for connecting the air inlet end of the opening (415) and the air bag (417), and the air outlet channel (419) is used for connecting the air outlet end of the opening (415) and the air bag (417). 8.The intelligent direct-current charging pile with fault judgment of claim 6, wherein The cleaning assembly (5) is installed outside the charging cable (2), the cleaning assembly (5) comprises an annular nozzle (51) and a gas conveying piece (53), the nozzle (51) is sleeved outside the charging cable (2), and the outer wall of the nozzle (51) is fixedly connected with a fixing frame (52); the two ends of the fixing frame (52) are fixedly connected with the cover plate (3); the gas conveying piece (53) is used for connecting the nozzle (51) and the air guide pipe (4142); the gas conveying piece (53) comprises a branch pipe (531), the branch pipe (531) is fixedly arranged on the surface of the air guide pipe (4142) and communicates with the air guide pipe (4142); the inside of the branch pipe (531) is slidably connected with a trapezoidal sealing column (532); the inside of the sealing column (532) is provided with a gas guide channel (533); and the bottom end of the gas guide channel (533) and the air inlet end of the nozzle (51) are fixedly connected with a gas conveying pipe (534). 9.The intelligent direct-current charging pile with fault judgment of claim 1, wherein The direct current charging pile body (1) comprises a main control module, a charging module, a fault detection module, a communication module, a display module and a power module, the fault detection module comprises a voltage detection unit, a current detection unit, a temperature detection unit and an insulation resistance detection unit, and the main control module is provided with a fault judgment algorithm.

10. A method for charging an intelligent direct-current charging pile with fault judgment, characterized in that, The intelligent direct current charging pile with fault judgment comprises the following steps: S1, the display module prompts success after the charging gun is connected, and the user initiates a charging request; S2, the main control module controls the initial detection of the fault detection module, determines whether there is a fault, starts charging if there is no fault, and prohibits charging and prompts if there is a fault; S3, the fault detection module collects data in real time during charging, the main control module continuously judges faults, and simultaneously adjusts the output voltage and current of the charging module in a constant current, constant voltage and trickle three-stage mode according to the battery SOC and temperature information fed back by the electric vehicle BMS; S4, when the battery full signal or the user stop request is received, stop charging and display charging data.

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