Contactless plug charging equipment for electric bicycle and electric bicycle

Abstract

The utility model provides a contactless plug charging device for an electric bicycle and the electric bicycle. The contactless plug charging device for the electric bicycle comprises a charging transmitting end and a receiving end. The charging transmitting end converts the high-frequency alternating current into an electromagnetic field and focuses the electromagnetic field on the receiving coil; and the receiving end clings to the groove of the transmitting end through the embedding part, so that high-efficiency energy transmission is ensured. A rectifying device is arranged in the receiving end and comprises a rectifying inductor and a rectifying module, high-efficiency conversion from high-frequency alternating current to stable direct current is achieved, and a temperature sensing fuse is arranged to guarantee safety. In addition, the receiving end shell is provided with a charging state indicating lamp and a storage groove, and an automatic winder is arranged in the storage groove. The transmission efficiency of the device exceeds 85%, the operation process is simplified, the problem of poor contact is reduced, the safety is remarkably enhanced, the electric shock risk is reduced, the device has an overheating protection function, the device is suitable for various electric bicycle charging scenes, and the use experience of a user and the durability of the device are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wireless charging technical field relates to a kind of contactless plug charging equipment and electric bicycle for electric bicycle. BACKGROUND

[0002] Electric bicycle becomes the ideal traffic tool of congestion avoidance, convenient parking and short-distance travel in urban traffic network with its compact design and flexible control. Its electric drive system abandons traditional fossil fuel, thereby realizing zero direct emission, significantly reducing air pollution and carbon footprint, and meeting the concept of modern green travel. However, the traditional wired charging method exposes some limitations in practical application: exposed wires and plugs increase electrical safety hazards; Arc discharge can be generated by metal friction at the plug, which can cause great impact on the device battery at high power, high voltage and high current; The use of transformer and other adaptive devices makes the charging process complex; Moreover, this charging mode is difficult to seamlessly integrate with intelligent management system, limiting the improvement of intelligent level. Especially in the sharing economy mode, the safety risks of socket charging and battery compatibility problems are more prominent. Therefore, it is particularly necessary to develop a wireless charging system suitable for electric bicycles. SUMMARY

[0003] To achieve the above purpose, the utility model provides a kind of contactless plug charging equipment for electric bicycle, to solve the problem of electric bicycle charging cumbersome, safety hazard and battery compatibility;

[0004] The second purpose of the utility model is to provide a kind of electric bicycle.

[0005] To solve the above technical problems, the utility model adopts the technical scheme that the contactless plug charging equipment for electric bicycle comprises:

[0006] The charging transmitting end is connected with the electric energy output end, for converting high-frequency alternating current into high-frequency electromagnetic field;

[0007] The charging receiving end is arranged on the electric bicycle, for receiving the electromagnetic field and converting into direct current;

[0008] The charging transmitting end comprises transmitting coil, transmitting terminal and input lead wire, wherein the transmitting terminal adopts SMA fixed connector, the center conductor is copper material, the insulating medium is polytetrafluoroethylene, and the shell is ABS resin;The shell of charging transmitting end includes recess, the transmitting coil is fixed to the inner wall of recess in the shell of charging transmitting end, and is connected with transmitting terminal through fixed lead wire;

[0009] The charging receiving end comprises a receiving coil, a rectification inductor, a rectification module and an output wire, wherein the diameter of the receiving coil is smaller than that of the transmitting coil; the rectification module is composed of an FR4 substrate and electronic components, adopts a full-bridge or half-bridge topology structure, and is used for rectifying high-frequency alternating current into direct current output.

[0010] The output end of the receiving coil is directly input to the input end of the rectification module through a wire; the output end of the rectification module is connected in series to the input end of the rectification inductor; and the output end of the rectification inductor is connected to the output wire through a receiving terminal.

[0011] Further, the diameter of the transmitting coil and the receiving coil ranges from 5 to 200 mm, the wire diameter ranges from 0.4 to 20 mm, the wire spacing ranges from 0.2 to 20 mm, and the diameter of the receiving coil is smaller than that of the transmitting coil.

[0012] Further, the rectification module further comprises a temperature sensing fuse for starting temperature protection when overheating; and the charging receiving end is provided with a voltage and current sensor.

[0013] Further, one end of the charging receiving end shell is provided with a fitting part which is matched and nested with a groove of the charging transmitting end shell; the receiving coil is arranged close to the side wall of the fitting part; and the receiving terminal is an SMA connector which is used for connecting the rectification device and the output wire.

[0014] Further, the device further comprises a receiving groove which is arranged at the head of the electric bicycle and is provided with a groove for fixing the charging receiving end; the receiving groove is provided with a magnetic adsorption component and is integrated with an automatic wire winder.

[0015] Further, the automatic wire winder is provided with a self-locking mechanism.

[0016] Further, the rectification inductor adopts copper winding and iron powder magnetic core.

[0017] The electric bicycle is provided with the above-mentioned electric bicycle non-contact plug charging device.

[0018] Compared with the prior art, the electric bicycle non-contact plug charging device has the following advantages:

[0019] The utility model discloses a wireless charging technology simplifies the charging process of bicycle, and user only needs to park the car in the charging area to complete the charging, does not need to plug the cable, reduces the operation failure and the problem of poor contact, reduces the risk of electric shock simultaneously, especially under the condition of damp or bad weather. The utility model discloses have the overheat and short circuit protection function, further improve the security, and through reducing the interface wear and tear and the opportunity of exposure in the air, prolong the service life of battery and charging equipment, reduce the corrosion risk. In addition, the utility model discloses can be integrated with intelligent management system, realizes remote monitoring and data collection, optimizes the charging network and maintenance plan, and user can also view the charging state and battery health information in real time through mobile application or vehicle-mounted display screen, improves the intelligent degree. The utility model reduces the dependence of electrical equipment on physical cable, reduces the consumption and environmental influence of plastic and other materials, avoids the environmental problem caused by cable aging, fracture or loss. The traditional charging needs the charging line and interface of specific type to cause the compatibility problem between different equipment. The utility model discloses transmit electric energy through the non-contact mode, does not need direct physical connection, thereby avoiding the compatibility obstacle caused by the interface type difference. In conclusion, the utility model discloses not only improve the charging convenience and the riding experience, but also solve the compatibility obstacle in traditional wired charging mode. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, below description in the drawing only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0021] Figure 1 It is the schematic diagram of the closing charging state of the receiving and transmitting end of the non-contact plug charging equipment of the embodiment,

[0022] Figure 2 It is the separating state of the receiving and transmitting end of the non-contact plug charging equipment of the embodiment,

[0023] Figure 3 It is the sectional view of the non-contact plug charging equipment of the embodiment,

[0024] Figure 4 It is the storage schematic diagram of the non-contact plug charging equipment of the embodiment, wherein, (a) is the non-stored state, (b) is the stored state,

[0025] Figure 5 It is the charging pile of the non-contact plug charging equipment of the embodiment,

[0026] Figure 6is the charging power output and efficiency change chart of the contactless plug charging device of the embodiment;

[0027] Figure 7 is the schematic diagram of the transmitting and receiving coils of the embodiment;

[0028] In the figure, 1 is a charging transmitting end; 101 is a transmitting coil; 102 is a transmitting terminal; 103 is an input lead; 104 is a fixed part; 2 is a charging receiving end; 201 is a receiving coil; 202 is a receiving terminal; 203 is an output lead; 204 is a rectifying inductor; 205 is a rectifying module; 3 is a charging state indicator light; 4 is a storage groove; 5 is a charging pile. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] As Figures 1-5 , the embodiment discloses a contactless plug charging device for electric bicycles, which comprises a charging receiving end 2 arranged on an electric bicycle and a charging transmitting end 1 arranged on an electric energy output end.

[0031] In some possible embodiments, the electric energy output end is a charging pile 5.

[0032] In some specific embodiments, as Figure 2 , the charging transmitting end 1 converts high-frequency alternating current into a high-frequency electromagnetic field and focuses the electromagnetic field on the receiving coil 201; the charging receiving end 2 converts the received electromagnetic field into charging direct current and transmits the charging direct current to a power consumption end. The transmitting end comprises a transmitting end shell, one end of the transmitting end shell is provided with a groove, and the other end is provided with an opening.

[0033] In some specific embodiments, the charging transmitting end 1 further comprises a transmitting terminal 102, the transmitting terminal 102 specifically adopts an SMA (SubMiniature version A) type connector, the material of the transmitting terminal 102 comprises copper as a center conductor, polytetrafluoroethylene (PTFE, commonly known as Teflon) as an insulating medium, and ABS resin for shell protection.

[0034] In some possible embodiments, the polytetrafluoroethylene can also be replaced by other fluoroplastics with similar properties as the insulating layer, such as fluorinated ethylene propylene (FEP), perfluoroalkoxy polymer (PFA) or ethylene-tetrafluoroethylene copolymer (ETFE) and the like.

[0035] In some possible embodiments, the SMA type connector can also be replaced by other similar functional connectors according to design needs; for example, MB (SubMiniature version B), 2.92mm (also known as K type) connector, N type connector, etc.

[0036] The transmitting terminal 102 penetrates the opening provided on the transmitting end shell and is stably fixed in place. One side of the transmitting terminal 102 extends to the internal space of the transmitting end shell, and the other side is connected with the input wire 103. The input wire 103 is responsible for being connected with the external charging pile 5, i.e., the power output end, so as to provide a power transmission path for the charging transmitting end 1 and ensure that the electric energy can be smoothly transmitted from the charging pile 5 to the transmitting end, thereby realizing the charging process of the target device.

[0037] In some possible embodiments, the transmitting terminal 102 penetrates the opening provided on the transmitting end shell and is stably fixed in place. One side of the transmitting terminal 102 extends to the internal space of the transmitting end shell, and the other side is connected with the input wire 103. The input wire 103 is responsible for being connected with the external charging pile 5, i.e., the power output end, so as to provide a power transmission path for the charging transmitting end 1 and ensure that the electric energy can be smoothly transmitted from the charging pile 5 to the transmitting end, thereby realizing the charging process of the target device.

[0038] In some specific embodiments, the transmitting coil 101 is connected as shown in FIG. 1B; specifically, a copper coil is wound and wrapped on the inner wall of the recess of the transmitting end shell; the transmitting coil 101 is fixed by the fixing part 104, and the transmitting terminal 102 penetrates the fixing shell and is connected with the transmitting coil 101 through the fixing wire. Figure 7

[0039] In some possible embodiments, the diameter of the transmitting coil 101 and the receiving coil 201 ranges from 5 to 200 mm, the wire diameter ranges from 0.4 to 20 mm, and the wire spacing ranges from 0.2 to 20 mm. The specific parameters can be adjusted according to the size of the product. The design of the receiving coil 201 needs to match the transmitting coil 101, and the diameter of the receiving coil 201 must be smaller than that of the transmitting coil 101, and the receiving coil 201 is usually nested inside the transmitting coil 101 to optimize the coupling efficiency.

[0040] In some specific embodiments, the input voltage of the input end is 0-200V alternating current, which is adjusted according to the required power.

[0041] In some specific embodiments, the receiving end includes a receiving end shell, and one end of the charging receiving end 2 shell is provided with a fitting part that can be embedded in the recess of the charging transmitting end 1 shell. Inside the shell of the charging transmitting device, the receiving coil 201 is tightly attached around the side wall of the fitting part. The specifications of the receiving coil 201 are the same as those of the transmitting coil 101, but the diameter of the receiving coil 201 must be smaller than that of the transmitting coil 101.

[0042] ​The receiving end shell is also provided with a rectifier device, specifically including a rectifier inductor 204 and a rectifier module 205; wherein the rectifier inductor 204 is specifically a copper-wound iron powder magnetic core, used for suppressing high-frequency harmonics and smoothing current ripple; between the rectifier inductor 204 and the receiving coil 201, a rectifier module 205 composed of an FR4 substrate and electronic components is arranged, specifically an AC-DC rectifier circuit module. The rectifier module 205 adopts a high-frequency full-bridge or half-bridge topology structure, and the topology form is optimized and selected according to the power demand of the wireless energy transmission system. In this embodiment, the rectifier module 205 efficiently rectifies the high-frequency alternating current coupled by the receiving coil 201 into stable direct current output, realizing the adaptation to the charging characteristics of the energy storage battery.

[0043] In some specific embodiments, the high-frequency alternating current (AC) output by the receiving coil 201 is directly input to the AC input end of the rectifier module 205 through a wire; the DC output end of the rectifier module 205 is connected in series to the rectifier inductor 204; the filtered stable direct current is connected to the output wire through the receiving terminal 202 from the output end of the rectifier inductor 204.

[0044] In some possible embodiments, the rectifier module 205 is also provided with a temperature-sensitive fuse, which starts temperature protection when the device overheats.

[0045] In some specific embodiments, the charging receiving end 2 is connected with the battery system of the electric bicycle via an output wire 203, which is responsible for transmitting direct current to complete the energy transfer process from the wireless charging device to the vehicle energy storage unit. The output wire 203 is connected with the rectifier device arranged inside the charging receiving end 2 shell through the receiving terminal 202;

[0046] In some possible embodiments, the output wire 203 outputs voltage and current according to the battery characteristics, and the output specifications are: voltage range 0-72V, current range 0-70A.

[0047] In some specific embodiments, the receiving terminal 202 is specifically an SMA connector, used for protecting the rectifier device. The material thereof selects copper with high conductivity as the center conductor, and polytetrafluoroethylene (PTFE, commonly known as Teflon) as the insulating medium.

[0048] In some possible embodiments, the polytetrafluoroethylene can also be replaced by other fluoroplastics with similar properties as the insulating layer, such as fluorinated ethylene propylene (FEP), perfluoroalkoxy polymer (PFA), or ethylene-tetrafluoroethylene copolymer (ETFE), etc.

[0049] In some possible implementations, the charging receiver 2 is further provided with a current and voltage sensor for real-time detection of the current and voltage status; the receiving end housing of the charging receiver 2 is also provided with a charging status indicator light 3; the charging status is indicated according to the status of the current and voltage sensor.

[0050] In some possible implementations, the contactless plug charging device also includes a storage slot 4, such as Figure 5 The storage slot 4 is installed on the electric bicycle, and its position and form can be specifically designed according to design needs. In this embodiment, the storage slot 4 is located at the front of the electric bicycle; and the storage slot 4 has a groove that matches the size and shape of the fitting part of the charging receiver 2's outer shell. In addition, the storage slot 4 has a built-in magnetic adsorption component, which provides a stable fixing force during riding, effectively preventing the charging receiver 2 from loosening due to vehicle vibration or other external forces, thereby ensuring the safety and reliability of the device. In some specific embodiments, the magnetic adsorption component is specifically a neodymium iron boron magnet adsorption component.

[0051] In some possible implementations, an automatic cable reel is integrated inside the housing of the storage slot 4 to automatically organize and retract excess output cable 203 when the charging receiver 2 is inserted into the storage slot 4. The automatic cable reel, installed inside the housing of the storage slot 4, ensures orderly cable storage, improving aesthetics and preventing cable tangling or external damage, while also ensuring the overall aesthetics and safety of the vehicle. In some possible implementations, the operation mechanism of the automatic cable reel is synchronized with the insertion and removal of the charging receiver 2, providing a convenient user experience. In some possible implementations, this synchronization is achieved through a self-locking mechanism within the automatic cable reel, or through electrical control via signals from current and voltage sensors. In some possible implementations, the self-locking mechanism specifically includes a ratchet-type self-locking mechanism, a friction plate-type self-locking mechanism, a snap-on self-locking mechanism, a spring-loaded self-locking mechanism, a button-triggered self-locking mechanism, a magnetic self-locking mechanism, or other self-locking mechanisms capable of preventing and releasing cable retraction.

[0052] like Figure 6 The contactless plug charging device of this embodiment is used to charge the battery of electric bicycles. It has a large charging power and exhibits high efficiency in the constant current charging stage, with an overall system efficiency of over 85%.

[0053] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0054] The above merely describes preferred embodiments of the present application, and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A contactless plug charging device for electric bicycles, characterized in that, include: The charging transmitter (1) is connected to the power output terminal and is used to convert high-frequency AC power into high-frequency electromagnetic field. A charging receiver (2) is installed on an electric bicycle to receive the electromagnetic field and convert it into direct current. The charging transmitter (1) includes a transmitting coil (101), a transmitting terminal (102) and an input wire (103). The outer shell of the charging transmitter (1) includes a groove. The transmitting coil (101) is fixed to the inner wall of the groove inside the outer shell of the charging transmitter (1) and is connected to the transmitting terminal (102) through a fixed wire. The charging receiver (2) includes a receiving coil (201), a rectifier, a receiving terminal (202), and an output wire (203). The rectifier includes a rectifier inductor (204) and a rectifier module (205); wherein the rectifier module (205) is composed of an FR4 substrate and electronic components, and adopts a full-bridge or half-bridge topology to rectify high-frequency AC power into DC power output; The output of the receiving coil (201) is directly input to the input of the rectifier module (205) via a wire; the output of the rectifier module (205) is connected in series to the input of the rectifier inductor (204); the output of the rectifier inductor (204) is connected to the output wire (203) via the receiving terminal (202).

2. The device according to claim 1, characterized in that, The diameters of the transmitting coil (101) and the receiving coil (201) range from 5 to 200 mm, the wire diameters range from 0.4 to 20 mm, and the wire spacing ranges from 0.2 to 20 mm. The diameter of the receiving coil (201) is smaller than that of the transmitting coil (101).

3. The device according to claim 1, characterized in that, The rectifier module (205) also includes a temperature sensing fuse for activating temperature protection when overheating; the charging receiver (2) is equipped with a voltage and current sensor.

4. The device according to claim 1, characterized in that, The charging receiver (2) has a fitting part at one end of its housing, which is matched and nested with the groove of the charging transmitter (1) housing; the receiving coil (201) is set close to the side wall of the fitting part; the receiving terminal (202) adopts an SMA connector, the center conductor is made of copper, and the insulating medium is polytetrafluoroethylene; the receiving terminal (202) is used to connect the rectifier and the output wire (203).

5. The device according to claim 1, characterized in that, The device also includes a storage slot (4) located at the front of the electric bicycle, with a groove inside for fixing the charging receiver (2); the storage slot (4) has a built-in magnetic adsorption component and an integrated automatic cable winder.

6. The device according to claim 5, characterized in that, The automatic reel is equipped with a self-locking mechanism.

7. The device according to claim 1, characterized in that, The rectifier inductor (204) uses a copper-wound iron powder core.

8. The device according to claim 1, characterized in that, The transmitting terminal (102) adopts an SMA connector, with its center conductor made of copper, its insulating medium made of polytetrafluoroethylene, and its shell made of ABS resin.

9. An electric bicycle, characterized in that, It is equipped with a contactless plug charging device for electric bicycles as described in any one of claims 1 to 8.

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