Electric vehicle wireless charging device and use method thereof

Abstract

The present invention provides a wireless charging device for electric vehicles and a method for using the same, comprising an electric vehicle and a receiving coil mounted on the bottom of the electric vehicle, a transmitting coil disposed on a charging surface, a control system disposed on the roadside, and a power supply. The power supply is connected to the transmitting coil via the control system. The charging surface is provided with a heat-insulating cavity for accommodating the transmitting coil, and a lifting assembly is disposed within the heat-insulating cavity for lifting the transmitting coil. The transmitting coil is normally flush with the charging surface, and the charging surface is provided with a limiting cavity for locking the tire on both sides of the heat-insulating cavity. When the front wheel of the electric vehicle is pressed against a support plate, the wheel and the support plate sink into the limiting cavity, causing the wheel to sink into the limiting cavity and complete the positioning of the electric vehicle. At this time, the transmitting coil at the bottom is aligned with the receiving coil. At the same time, when the support plate rotates downward, the linkage airbag expands, driving the transmitting coil upward, thereby shortening the distance between the transmitting coil and the receiving coil.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging of electric vehicles, and in particular to a wireless charging device for electric vehicles and a method for using the same. Background Art

[0002] As global resource and environmental pressures increase, new energy vehicles have been vigorously promoted and used, and many countries have set timetables for phasing out fuel vehicles.

[0003] Currently, new energy vehicles are primarily electric vehicles, powered by batteries. Most pure electric vehicles have a range of 150km to 300km. When the battery runs low, it requires immediate recharging. Furthermore, batteries contribute significantly to the cost and weight of electric vehicles, significantly hindering their widespread adoption.

[0004] Current charging methods mainly use wired charging piles, with a very small number of wireless charging piles. For example, a wireless charging highway with Chinese patent publication number CN107938462B includes "a pavement system and a wireless charging system. The pavement system includes a resin layer, a solar panel layer, a pavement layer, and a road base layer from top to bottom. It is divided into several wireless charging lanes according to the width of the highway pavement. The wireless charging system is arranged at the center line of each lane and embedded in the solar panel layer and the pavement layer. The wireless charging system includes a power supply grid and a wireless charging plate. The power supply grid is arranged below the wireless charging plate, and the wireless charging plate is an array composed of several rectangular wireless charging plates with arc-shaped protrusions on the surface."

[0005] The transmitting coil is configured as an arc-shaped protrusion. While this shortens the distance between the transmitting and receiving ends, the presence of this protrusion on the road or roadside can affect the safety of vehicles not requiring charging, other e-bikes, and pedestrians. Furthermore, without a reliable positioning device between the vehicle and the transmitting coil, the receiving coil on the vehicle's underside cannot be accurately aligned with the transmitting coil. When the receiving and transmitting coils are misaligned, the refraction area between the protruding transmitting coil and the receiving coil is smaller than that of a flat transmitting coil, resulting in poor charging efficiency. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In view of the deficiencies in the prior art, the present invention provides a wireless charging device for an electric vehicle and a method for using the same, which solves the problems raised in the above background technology.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a wireless charging device for electric vehicles, including an electric vehicle and a receiving coil installed at the bottom thereof, a transmitting coil arranged on the charging pavement, a control system arranged on the roadside, and a power supply, the power supply is connected to the transmitting coil through the control system, the charging pavement is provided with a heat-insulating cavity for accommodating the transmitting coil, the heat-insulating cavity is provided with a lifting assembly that can lift the transmitting coil, the transmitting coil is flush with the charging pavement under normal circumstances, and the charging pavement is provided with limiting cavities for clamping tires on the front and rear sides of the heat-insulating cavity, the top of the limiting cavity is rotatably connected to a support plate, and a retractable support mechanism is provided between the bottom of the support plate and the bottom of the limiting cavity, when the tire of the electric vehicle contacts the support plate, it will drive the support plate to rotate into the limiting cavity, and when the support mechanism is forced to shrink, it can link the lifting assembly to lift the transmitting coil.

[0010] Preferably, a forward limit mechanism and a reverse limit mechanism for limiting the forward and reverse rotation of the shaft are respectively provided between the two ends of the shaft of the support plate and the charging pavement, and a gravity sensor is provided on the charging pavement on the rear side of the front support plate, and the gravity sensor is connected to the control system; when the gravity sensor detects the front wheel of the vehicle for the first time, the forward limit mechanism is disconnected and the reverse limit mechanism is activated; when the gravity sensor detects the front wheel of the vehicle for the second time, the reverse limit mechanism is disconnected and the forward limit mechanism is activated.

[0011] Preferably, the forward limiting mechanism includes a ratchet, a pawl cooperating with the ratchet, a top plate and an electromagnet, the ratchet is coaxially sleeved on the rotating shaft, one end of the pawl is hinged on the charging pavement, the top plate is fixed on the charging pavement and is located above the pawl, a spring 2 is provided between the top surface of the pawl and the top plate, the electromagnet is provided at the bottom of the top plate and corresponds to the pawl, the electromagnet is connected to the control system, when the electromagnet is energized, the pawl and the electromagnet have the same magnetic pole corresponding to one side, the structure of the reverse limiting mechanism is consistent with that of the forward limiting mechanism, and the setting direction of the ratchet of the reverse limiting mechanism is opposite to that of the ratchet of the forward limiting mechanism.

[0012] Preferably, the lifting assembly includes a base, a guide rod, and an airbag, the transmitting coil is arranged on the base, the guide rod is vertically arranged in the insulation cavity, sliding sleeves are arranged on both sides of the base and are sleeved on the guide rod, and the airbag is arranged between the base and the bottom of the insulation cavity.

[0013] Preferably, the support mechanism includes a cylinder body and a telescopic rod telescopically connected to the cylinder body in a piston-like manner. The bottom of the cylinder body is hinged in the limiting cavity, the top of the telescopic rod is hinged to the support plate, a spring is provided between the bottom end of the telescopic rod and the bottom of the cylinder body, and the cylinder body and the airbag are connected by a hose.

[0014] Preferably, the cavity wall of the heat-insulating cavity is provided with a layer of insulating heat-conducting material.

[0015] Preferably, a soft buffer pad is provided on the front end of the limiting cavity.

[0016] Preferably, the control system on the roadside is provided with an infrared sensor for receiving vehicle entry signals.

[0017] A method for using a wireless charging device for an electric vehicle, the method comprising the following steps:

[0018] Step 1: The electric vehicle enters the charging road, the infrared sensor detects the electric vehicle, and the control system controls the gravity sensor to be powered on and enter the working state;

[0019] Step 2: When the gravity sensor detects the front wheel of the electric vehicle for the first time, the control system controls the electromagnet of the forward limit mechanism to be energized, so that the pawl of the forward limit mechanism disengages the ratchet; the electromagnet of the reverse limit mechanism is in a power-off state, so that the pawl of the reverse limit mechanism grips the ratchet; at this time, the support plate can only rotate into the limit cavity;

[0020] Step 3: After the wheel is pressed against the support plate, the wheel and the support plate sink into the limiting cavity, causing the wheel to sink into the limiting cavity and press against the buffer pad to complete the positioning of the electric vehicle. At this time, the transmitting coil at the bottom is just aligned with the receiving coil;

[0021] Step 4: The support plate rotates downward, driving the telescopic rod to retract into the cylinder and squeeze the cylinder. The gas in the cylinder is pressed into the airbag through the hose. The airbag expands and drives the transmitting coil to rise, shortening the distance between the transmitting coil and the receiving coil.

[0022] Step 5: The transmitting coil and the receiving coil work together to realize wireless dynamic charging.

[0023] (3) Beneficial effects

[0024] The present invention provides a wireless charging device for electric vehicles and a method for using the same. The device has the following beneficial effects:

[0025] 1. The electric vehicle wireless charging device and its use method: when the front wheel of the electric vehicle is pressed against the support plate, the wheel and the support plate sink into the limit cavity, causing the wheel to sink into the limit cavity to complete the positioning of the electric vehicle. At this time, the transmitting coil at the bottom is just aligned with the receiving coil. At the same time, when the support plate rotates downward, the linkage airbag expands and drives the transmitting coil to rise, shortening the distance between the transmitting coil and the receiving coil. At the same time, accurate positioning between the transmitting coil and the receiving coil is achieved and the distance between the two is shortened, so that the wireless charging effect is optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front cross-sectional view of the charging pavement of the present invention;

[0027] Figure 2 is a side view of the present invention;

[0028] Figure 3 This is an axonometric diagram of the charging pavement of the present invention;

[0029] Figure 4 Schematic diagram of the positive and negative limit mechanism of the present invention;

[0030] Figure 5 This is an axonometric view of the interior of the limiting cavity of the present invention;

[0031] Figure 6 It is a partial cross-sectional view of the limiting cavity of the present invention;

[0032] Figure 7 This is a diagram of the charging status of the electric vehicle of the present invention.

[0033] In the figure: 1 electric vehicle, 2 charging module, 3 battery, 4 support mechanism, 5 forward limit mechanism, 6 reverse limit mechanism, 7 charging pavement, 8 receiving coil, 9 transmitting coil, 10 heat insulation cavity, 11 base, 12 guide rod, 13 airbag, 14 limit cavity, 15 support plate, 16 hose, 17 buffer pad, 18 gravity sensor, 19 control system, 20 power supply, 21 infrared sensor, 41 cylinder, 42 telescopic rod, 43 spring 1, 51 ratchet, 52 pawl, 53 top plate, 54 spring 2, 55 electromagnet. DETAILED DESCRIPTION

[0034] The embodiment of the present invention provides a wireless charging device for electric vehicles and a method for using the same. Figure 1-7 As shown, the wireless charging device includes an electric vehicle 1, a receiving coil 8 mounted on its bottom, a transmitting coil 9 mounted on the charging surface 7, a control system 19 located on the roadside, and a power supply 20. Power supply 20 is connected to transmitting coil 9 via control system 19. Power supply 20 can be powered by the power grid, solar photovoltaic cells, or wind turbines. Power supply 20 is connected to control system 19 installed on the roadside. Control system 19 is a rectangular box with an infrared sensor 21 (an infrared diffuse reflection photoelectric position sensor) installed inside for vehicle position detection and analysis. Infrared sensor 21 is an infrared diffuse reflection photoelectric position sensor, a power relay that controls the power on / off, a primary power conversion device that converts industrial frequency AC power to high-frequency AC power, and a smart meter for collecting electrical parameters. In this example, each control system 19 controls the power on and off of four transmitting coils 9. The number of control systems 19 is determined by the length of the road surface.

[0035] The transmitting coil 9 is spirally wound into a rectangular shape using Litz wire and is fixed and sealed to a support frame composed of aluminum alloy profiles and Bakelite insulation boards. The coil's ends are led out with wires and sealed. The four coils are connected in series and connected to the output of the control system 19. The charging surface 7 is provided with an insulating cavity 10 that accommodates the transmitting coil 9. The cavity 10 is lined with a layer of insulating and thermally conductive material.

[0036] The receiving coil 8 has the same structure and appearance as the transmitting coil 9 and is installed at the bottom of the electric vehicle 1 . The wires at both ends of the coil are connected to the charging module 2 , and the charging module 2 is connected to the battery 3 .

[0037] like Figure 1 As shown, a lifting assembly capable of lifting and lowering the transmitting coil 9 is provided in the heat-insulating cavity 10. The transmitting coil 9 is normally flush with the charging pavement 7, which can reduce the impact on normally traveling vehicles and pedestrians compared to a protruding arrangement. A limiting cavity 14 for clamping the tire is provided on the charging pavement 7 at the front and rear sides of the heat-insulating cavity 10. A support plate 15 is rotatably connected to one end of the top of the limiting cavity 14, and a soft cushion 17 is provided on one side of the front end of the limiting cavity 14. The soft cushion 17 is used to reduce the contact stress between the tire and the wall of the limiting cavity 14. A retractable support mechanism 4 is provided between the bottom of the support plate 15 and the bottom of the limiting cavity 14. Under normal circumstances, the support plate 15 is supported by the support mechanism 4 and is flush with the charging pavement 7.

[0038] When the tire of the electric vehicle 1 contacts the support plate 15, the electric vehicle 1 drives the support plate 15 to rotate into the limiting cavity 14 due to its own weight. When the support mechanism 4 contracts under force, it can be linked to the lifting assembly to lift the transmitting coil 9, thereby shortening the distance between the transmitting coil 9 and the receiving coil 8.

[0039] like Figure 4 As shown, a forward limiter 5 and a reverse limiter 6 are respectively installed between the ends of the rotating shaft of the support plate 15 and the charging surface 7 to limit the forward and reverse rotation of the shaft. A gravity sensor 18 is installed on the charging surface 7 behind the front support plate 15 to detect the presence of a vehicle wheel. Gravity sensor 18 is connected to a control system 19. When gravity sensor 18 detects the front wheel of a vehicle for the first time, forward limiter 5 is disengaged and reverse limiter 6 is activated. When gravity sensor 18 detects the front wheel of a vehicle for the second time, reverse limiter 6 is disengaged and forward limiter 5 is activated.

[0040] like Figure 6As shown, the forward limiting mechanism 5 includes a ratchet 51, a pawl 52 mating with the ratchet 51, a top plate 53, and an electromagnet 55. The ratchet 51 is coaxially mounted on the rotating shaft. One end of the pawl 52 is hinged to the charging surface 7. The top plate 53 is fixed to the charging surface 7 and positioned above the pawl 52. A spring 54 is disposed between the top surface of the pawl 52 and the top plate 53. Under normal conditions, the pawl 52 is pressed against the teeth of the ratchet 51 by the action of the spring 54. The electromagnet 55 is disposed at the bottom of the top plate 53 and corresponds to the pawl 52. The pawl 52 is made of iron or magnet. The electromagnet 55 is connected to the control system 19. When the electromagnet 55 is energized, the magnetic poles of the pawl 52 and the electromagnet 55 are aligned. The structure of the reverse limiting mechanism 6 is the same as that of the forward limiting mechanism 5. The ratchet 51 of the reverse limiting mechanism 6 is arranged in the opposite direction to that of the ratchet 51 of the forward limiting mechanism 5.

[0041] When the control system 19 controls the electromagnet 55 of the forward limiting mechanism 5 to be energized and the electromagnet 55 of the reverse limiting mechanism 6 to be deenergized, the pawl 52 of the forward limiting mechanism 5 disengages from the ratchet 51 and the pawl 52 of the reverse limiting mechanism 5 is engaged with the ratchet 51, so that the support plate 15 can only rotate in the forward clockwise direction. When the control system 19 controls the electromagnet 55 of the forward limiting mechanism 5 to be deenergized and the electromagnet 55 of the reverse limiting mechanism 6 to be energized, the pawl 52 of the forward limiting mechanism 5 engages with the ratchet 51 and the pawl 52 of the reverse limiting mechanism 5 is disengaged from the ratchet 51, so that the support plate 15 can only rotate in the reverse counterclockwise direction.

[0042] like Figure 1 As shown, the lifting assembly includes a base 11, a guide rod 12, and an airbag 13. The transmitting coil 9 is mounted on the base 11. The guide rod 12 is vertically arranged within the heat-insulating cavity 10. Sliding sleeves are provided on both sides of the base 11 and fit over the guide rod 12. The airbag 13 is positioned between the base 11 and the bottom of the heat-insulating cavity 10. The contraction and expansion of the airbag 13 drives the base 11 up and down. A spring can be mounted on the guide rod 12 below the base 11. When the airbag 13 is fully contracted, the spring lowers the transmitting coil 9 until it is flush with the charging surface 7.

[0043] like Figure 6 As shown, support mechanism 4 includes a cylinder 41 and a telescopic rod 42 connected to cylinder 41 in a piston-like telescopic manner. The bottom of cylinder 41 is hinged within retaining cavity 14, and the top of telescopic rod 42 is hinged to support plate 15. A spring 143 is interposed between the bottom of telescopic rod 42 and the bottom of cylinder 41. Cylinder 41 is connected to airbag 13 via a hose 16. Under normal conditions, spring 143 acts to push telescopic rod 42 up to flush with charging surface 7. When support plate 15 is compressed, it rotates downward, driving telescopic rod 42 to squeeze cylinder 41, forcing the gas within cylinder 41 toward airbag 13.

[0044] A method for using a wireless charging device, the method comprising the following steps:

[0045] Step 1: When the battery 3 in the electric vehicle 1 is low on power and needs to be charged, it enters the charging road 7. After the infrared sensor 21 detects the electric vehicle 1, it controls the power switch to open the power relay, and the primary power conversion device starts to convert the industrial frequency AC power input by the power supply 20 into high-frequency AC power. The high-frequency AC power is then injected into the transmitting coil 9 after resonance compensation. At the same time, the control system controls the gravity sensor 18 to be energized and enter the working state.

[0046] Step 2: When the gravity sensor 18 detects the front wheel of the electric vehicle 1 for the first time, the control system 19 controls the electromagnet 55 of the forward limiting mechanism 5 to be energized, so that the pawl 52 of the forward limiting mechanism 5 disengages the ratchet 51; the electromagnet 55 of the reverse limiting mechanism 5 is in a de-energized state, so that the pawl 52 of the reverse limiting mechanism 5 grips the ratchet 51; at this time, the support plate 15 can only rotate into the limiting cavity 14;

[0047] Step three, such as Figure 7 As shown, the electric vehicle 1 is moving slowly at this time. After the front wheel of the electric vehicle 1 gradually presses on the support plate 15, the wheel and the support plate 15 sink into the limiting cavity 14, so that the wheel is trapped in the limiting cavity 14 and presses on the buffer pad 17 to complete the positioning of the electric vehicle 1. At this time, the transmitting coil 9 at the bottom is just aligned with the receiving coil 8;

[0048] Step 4: The support plate 15 rotates downward, driving the telescopic rod 42 to retract into the cylinder 41 and squeeze the cylinder 41. The gas in the cylinder 41 is pressed into the airbag 13 through the hose 16. The airbag 13 expands and drives the transmitting coil 9 to rise, shortening the distance between the transmitting coil 9 and the receiving coil 8.

[0049] In step 5, a high-frequency alternating magnetic field is generated within a certain spatial range around the transmitting coil 9. The receiving coil 8 at the bottom of the vehicle captures part of the high-frequency alternating magnetic field and generates a high-frequency induced voltage. The secondary power conversion device in the charging module 2 converts and regulates the high-frequency AC voltage to form direct current to charge the battery 3.

[0050] Step 6: When the electric vehicle 1 is fully charged, it reverses and drives out of the limiting cavity 14. At this time, the gravity sensor 18 detects the front wheel of the electric vehicle 1 for the second time, and the control system 19 controls the electromagnet 55 of the forward limiting mechanism 5 to be de-energized, so that the pawl 52 of the forward limiting mechanism 5 engages the ratchet 51; the control system 19 controls the electromagnet 55 of the reverse limiting mechanism 5 to be energized, so that the pawl 52 of the reverse limiting mechanism 5 disengages the ratchet 51; at this time, the support plate 15 can only rotate counterclockwise toward the outside of the limiting cavity 14, and after losing the gravity of the electric vehicle 1, the support plate 15 returns upward under the action of the spring 1 43 to be flush with the charging surface 7;

[0051] Step 7: The electric vehicle 1 leaves the charging road surface 7, and the control system 19 resets all electrical components.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A wireless charging device for an electric vehicle, comprising an electric vehicle (1) and a receiving coil (8) mounted on the bottom of the electric vehicle, a transmitting coil (9) disposed on a charging surface (7), a control system (19) disposed on the roadside, and a power supply (20), wherein the power supply (20) is connected to the transmitting coil (9) via the control system (19), and is characterized in that: The charging pavement (7) is provided with a heat-insulating cavity (10) for accommodating a transmitting coil (9), and a lifting assembly for lifting the transmitting coil (9) is provided in the heat-insulating cavity (10). The transmitting coil (9) is flush with the charging pavement (7) under normal conditions. The charging pavement (7) is provided with a limit cavity (14) for clamping a tire on both the front and rear sides of the heat-insulating cavity (10). The top of the limit cavity (14) is rotatably connected to a support plate (15), and a retractable support mechanism (4) is provided between the bottom of the support plate (15) and the bottom of the limit cavity (14). When the tire of the electric vehicle (1) contacts the support plate (15), the support plate (15) is driven into the limit cavity (14). The support mechanism (4) is rotated, and when the support mechanism (4) is contracted by force, the lifting assembly can be linked to lift the transmitting coil (9); a forward limiting mechanism (5) and a reverse limiting mechanism (6) for limiting the forward and reverse rotation of the rotating shaft are respectively provided between the two ends of the rotating shaft of the support plate (15) and the charging road surface (7); a gravity sensor (18) is provided on the charging road surface (7) on the rear side of the front support plate (15); the gravity sensor (18) is connected to the control system (19); when the gravity sensor (18) detects the front wheel of the vehicle for the first time, the forward limiting mechanism (5) is disconnected and the reverse limiting mechanism (6) is activated; when the gravity sensor (18) detects the front wheel of the vehicle for the second time, the reverse limiting mechanism (6) is disconnected. , the positive limit mechanism (5) is actuated; the positive limit mechanism (5) comprises a ratchet (51), a pawl (52) matched with the ratchet (51), a top plate (53) and an electromagnet (55), the ratchet (51) is coaxially sleeved on the rotating shaft, one end of the pawl (52) is hinged on the charging pavement (7), the top plate (53) is fixed on the charging pavement (7) and is located above the pawl (52), a spring 2 (54) is provided between the top surface of the pawl (52) and the top plate (53), the electromagnet (55) is provided at the bottom of the top plate (53) and corresponds to the pawl (52), the electromagnet (55) is connected to the control system (19), and when the electromagnet (55) ) when power is turned on, the pawl (52) and the electromagnet (55) have the same magnetic pole on one side, the structure of the reverse limiting mechanism (6) is consistent with that of the forward limiting mechanism (5), and the setting direction of the ratchet (51) of the reverse limiting mechanism (6) is opposite to that of the ratchet (51) of the forward limiting mechanism (5); the lifting assembly includes a base (11), a guide rod (12), and an airbag (13), the transmitting coil (9) is arranged on the base (11), the guide rod (12) is vertically arranged in the heat insulation cavity (10), and sliding sleeves are arranged on both sides of the base (11) and are mounted on the guide rod (12), and the airbag (13) is arranged between the base (11) and the bottom of the heat insulation cavity (10).

2. The wireless charging device for electric vehicles according to claim 1, characterized in that: The support mechanism (4) includes a cylinder (41) and a telescopic rod (42) connected to the cylinder (41) in a piston-type telescopic manner. The bottom of the cylinder (41) is hinged in the limiting cavity (14). The top of the telescopic rod (42) is hinged to the support plate (15). A spring (43) is provided between the bottom end of the telescopic rod (42) and the bottom of the cylinder (41). The cylinder (41) and the airbag (13) are connected via a hose (16).

3. The wireless charging device for electric vehicles according to claim 1, characterized in that: The cavity wall of the heat-insulating cavity (10) is provided with a layer of insulating heat-conducting material.

4. The wireless charging device for electric vehicles according to claim 1, characterized in that: A soft buffer pad (17) is provided on the front end of the limiting cavity (14).

5. The wireless charging device for electric vehicles according to claim 1, characterized in that: The control system (19) on the roadside is provided with an infrared sensor (21) for receiving a vehicle entry signal.

6. A method for using a wireless charging device for an electric vehicle, characterized in that: Using the wireless charging device according to any one of claims 1 to 5, the method comprises the following steps: Step 1: The electric vehicle enters the charging road, the infrared sensor detects the electric vehicle, and the control system controls the gravity sensor to be powered on and enter the working state; Step 2: When the gravity sensor detects the front wheel of the electric vehicle for the first time, the control system controls the electromagnet of the forward limit mechanism to be energized, so that the pawl of the forward limit mechanism disengages the ratchet; the electromagnet of the reverse limit mechanism is in a power-off state, so that the pawl of the reverse limit mechanism grips the ratchet; at this time, the support plate can only rotate into the limit cavity; Step 3: After the wheel is pressed against the support plate, the wheel and the support plate sink into the limiting cavity, causing the wheel to sink into the limiting cavity and press against the buffer pad to complete the positioning of the electric vehicle. At this time, the transmitting coil at the bottom is just aligned with the receiving coil; Step 4: The support plate rotates downward, driving the telescopic rod to retract into the cylinder and squeeze the cylinder. The gas in the cylinder is pressed into the airbag through the hose. The airbag expands and drives the transmitting coil to rise, shortening the distance between the transmitting coil and the receiving coil. Step 5: The transmitting coil and the receiving coil work together to realize wireless dynamic charging.

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