Wireless charging system for electric vehicle and electric vehicle

Abstract

The utility model discloses a wireless charging system for an electric automobile and the electric automobile. The wireless charging system comprises a charging transmitting module and a charging receiving module, the charging transmitting module comprises an H-shaped magnetic flux collector and a transmitting coil which are coupled with each other; the charging receiving module comprises a secondary winding with concentrated magnetic flux, and the secondary winding is close to the transmitting coil and is used for being coupled with the magnetic flux generated by the H-shaped magnetic flux collector and generating induction current; the transmitting coil comprises a transmitting coil winding and a coil framework, wherein the transmitting coil winding is wound on the coil framework. Compared with a traditional wireless charging system, the wireless charging system can charge more electric quantity for the battery of the electric vehicle, greatly shortens the charging time, improves the use convenience of a user, can be compatible with various electric vehicles of different types and models in the market, and provides powerful support for popularization of wireless charging of the electric vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile charging technical field especially relates to a wireless charging system for electric automobile and electric automobile. BACKGROUND

[0002] With the increasing popularity of electric vehicles, its charging convenience has become one of the key factors restricting its development. The traditional wired charging method has many inconveniences, such as the need to plug in and plug out the charging cord, the inconvenience of operation in bad weather conditions, and the easy damage of the charging interface due to long-term plugging and unplugging. Wireless charging technology, as a new charging method, has emerged as the times require, providing a more convenient and safer solution for electric vehicle charging.

[0003] Electric vehicle wireless charging technology is mainly based on the principle of electromagnetic induction, and realizes wireless transmission of electric energy through magnetic field coupling between the transmitting end and the receiving end. However, in actual application, this technology faces a series of challenges. On the one hand, in the traditional wireless charging system, the coupling between the transmitting and receiving coils is through air, and the magnetic permeability of air is low, resulting in low mutual inductance. In order to compensate for the impact of low inductance, it is often necessary to increase the working frequency. However, higher working frequency can cause a series of problems, such as increasing the system loss, including the resistance loss of the coil and the magnetic hysteresis loss of the magnetic core, which not only reduces the charging efficiency, but also causes the system to heat up seriously, affecting the stability and service life of the system. At the same time, high-frequency operation also increases the size of electronic devices related to the wireless charging system, increasing the cost and complexity of the system. On the other hand, the ground clearance of different electric vehicles varies. For electric vehicles with high ground clearance, the traditional wireless charging system is difficult to ensure a stable and efficient charging process. Due to the large change in distance between the transmitting and receiving coils, the magnetic field coupling effect is poor, the energy transmission efficiency is reduced, and even problems such as charging interruption may occur.

[0004] In addition to the above challenges, in the electric vehicle wireless charging system, the performance of the transmitting coil is crucial to the efficiency and reliability of the entire system. The traditional structure and material of the transmitting coil may not meet the requirements in a high-frequency working environment, such as the easy generation of eddy current effect, resulting in energy loss and heating problems. In summary, the development of an efficient, stable, and low-loss wireless charging system for electric vehicles that can adapt to different ground clearances and has good electromagnetic performance is of great significance to the development of the electric vehicle industry. SUMMARY

[0005] The utility model provides a wireless charging system for electric automobile and electric automobile for the deficiency that present technology exists, through the special transmission coil that has designed in the charging transmission module, cooperation H type magnetic flux concentrator, charging efficiency is improved obviously, make the process of wireless charging more stable, shorten the charging time, improve the use convenience of user.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] First, the utility model provides a wireless charging system for electric automobile, include: charging transmission module and charging receiving module, charging transmission module includes the H type magnetic flux concentrator and transmission coil of mutual coupling, charging receiving module includes the secondary winding with magnetic flux concentration, the position of secondary winding is close to transmission coil, for with the magnetic flux coupling of H type magnetic flux concentrator is generated, and the induced current is generated,

[0008] Transmission coil includes transmission coil winding and coil skeleton, wherein transmission coil winding is wound on coil skeleton.

[0009] As a further technical scheme, the charging transmission module further includes a power grid connection module and a charge transmission module, the output end of the power grid connection module is connected with the input end of the charge transmission module, and the output end of the charge transmission module is connected with the transmission coil. The power grid connection module is used for obtaining external power and supplying power to the transmission coil through the power grid connection module.

[0010] As a further technical scheme, the wireless charging system further includes a lifting device, and the charging transmission module is installed on the lifting device and used for adjusting the height of the charging transmission module according to the position of the charging receiving module.

[0011] As a further technical scheme, the transmission coil is an H-shaped transmission coil, wherein the coil skeleton is an H-shaped coil skeleton; the transmission coil further includes an outer shell and an upper cover plate, the upper cover plate covers the outer shell, and the transmission coil winding and the coil skeleton are arranged in the outer shell.

[0012] As a further technical scheme, the bottom of the outer shell is provided with a magnetic shielding reflection plate made of iron oxide material, which is used for shielding electromagnetic field downward and emitting electromagnetic field upward, and the transmission coil and the coil skeleton are arranged above the magnetic shielding reflection plate.

[0013] As a further technical scheme, the inner space formed by the outer shell and the upper cover plate is filled with a filling material, the filling material is synthetic resin, which is used for increasing strength and heat conduction, and the upper cover plate is a convex arc structure made of non-metallic material.

[0014] As a further technical scheme, the shell is made of aluminum material; the H-shaped coil framework is stacked by long crystal grain oriented steel plates containing silicon and nickel; and the transmitting coil winding is made of multi-strand Litz enameled wire.

[0015] As a further technical scheme, insulating paint is coated on the outer surface of the coil framework after the transmitting coil winding is wound thereon, for insulation and heat conduction.

[0016] As a further technical scheme, the H-shaped magnetic flux concentrator is made of cold-rolled oriented steel plate.

[0017] In the second aspect, the utility model provides a kind of electric vehicle, including as any one of first aspect described kind of wireless charging system for electric vehicle, and the charging receiving module is installed on electric vehicle.

[0018] The one or more technical solutions of the utility model have the following beneficial effects:

[0019] (1) the utility model discloses a special transmitting coil in the design of charging transmitting module, including coil framework and the transmitting coil winding wound on the coil framework, transmitting coil and H-shaped magnetic flux concentrator combination, significantly improve charging efficiency.The coil framework stacked by long crystal grain oriented steel plates containing silicon and nickel has the characteristics of high permeability and low magnetic loss under high frequency, so that the transmitting coil can generate stronger and more stable magnetic field when energized.The H-shaped magnetic flux concentrator in the utility model is made of cold-rolled oriented steel plate, and its high magnetic permeability can effectively guide and concentrate magnetic flux to form a high-permeability magnetic flux path.This design greatly enhances the mutual inductive coupling between the charging transmitting module and the charging receiving module, thereby providing higher power to the load (electric vehicle battery) without increasing the mutual inductance between the primary (transmitting coil) and secondary winding, achieving faster and more stable charging of the electric vehicle.In the same charging time, compared with the traditional wireless charging system, the utility model can charge more electric quantity into the electric vehicle battery, greatly shortens the charging time and improves the user's convenience.

[0020] (2) the utility model also designs lifting device, and charging transmitting module is installed on lifting device, so that charging transmitting module can flexibly adjust height according to the ground clearance of electric vehicle, to ensure that the H-shaped magnetic flux concentrator of charging transmitting module maintains the best magnetic flux coupling state with the charging receiving module installed on electric vehicle.No matter the ground clearance of electric vehicle is high or low, the utility model can automatically adapt and realize maximum magnetic flux transmission, ensuring stable and efficient charging process.This makes the wireless charging system provided by the utility model have wide applicability, and can be compatible with various types and models of electric vehicles on the market, providing strong support for the popularization of electric vehicle wireless charging. BRIEF DESCRIPTION OF DRAWINGS

[0021] The description and drawings of the utility model constitute a part of the utility model, and are used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0022] Figure 1 It is the overall structure schematic diagram of the utility model wireless charging system;

[0023] Figure 2 It is the magnetic flux path schematic diagram in the utility model wireless charging system;

[0024] Figure 3 It is the structure schematic diagram of the transmitting coil in the utility model wireless charging system;

[0025] Among them: 100, wireless charging system;101, electric vehicle;102, charging transmitting module;102A, H type magnetic flux concentrator;102B, transmitting coil;102C, one end of magnetic flux concentrator;102D, the other end of magnetic flux concentrator;103, charging receiving module;103A, secondary winding;104, lifting device;105, magnetic flux path;105A, high permeability path;105B, low permeability path;401, shell;402, magnetic reflection plate;403, transmitting coil winding;404, coil skeleton;405, upper cover plate;406, filling material. Specific implementation

[0026] It should be pointed out that the following detailed description is all exemplary, and is aimed at providing further explanation to the utility model. Unless otherwise indicated, all technical and scientific terms used in the utility model have the same meaning as that understood by ordinary skilled person in the technical field to which the utility model belongs.

[0027] Embodiment one

[0028] The utility model provides a kind of wireless charging system for electric vehicle, such as Figure 1As shown, the wireless charging system 100 includes a charging transmitting module 102 and a charging receiving module 103; wherein the charging transmitting module 102 includes an H-shaped magnetic flux concentrator 102A and a transmitting coil 102B coupled with each other, the magnetic flux concentrator is made of a material with a magnetic permeability greater than that of air, and in this embodiment, the H-shaped magnetic flux concentrator is made of a cold-rolled grain-oriented steel sheet (CRGO). The charging receiving module 103 includes a secondary winding 103A with magnetic flux concentration, and the secondary winding 103A is located close to the transmitting coil 102B, for coupling with the magnetic flux generated by the magnetic flux concentrator 102A, and generating an induced current. And the charging transmitting module further includes a power grid connection module and a charge transmission module, wherein the output end of the power grid connection module is connected to the input end of the charge transmission module, and the output end of the charge transmission module is connected to the transmitting coil, the power grid connection module is used to obtain external power, and the transmitting coil is powered through the power grid connection module. The wireless charging system 100 further includes a lifting device 104, and the charging transmitting module 102 is installed on the lifting device 104, for adjusting the height of the charging transmitting module according to the position of the charging receiving module, thereby allowing the H-shaped magnetic flux concentrator of the charging transmitting module to increase and / or decrease the proximity to the charging receiving module based on the ground clearance of the electric vehicle and the magnetic flux coupled between them, so as to couple the maximum magnetic flux, i.e. the maximum energy transmission occurs between them. No matter whether the ground clearance of the electric vehicle is high or low, the system can automatically adapt and achieve maximum magnetic flux transmission, ensuring a stable and efficient charging process. This makes the wireless charging system in this embodiment have wide applicability, and can be compatible with various different types and models of electric vehicles on the market, providing strong support for the popularization of wireless charging for electric vehicles.

[0029] The principle of the magnetic flux path 105 generated in the wireless charging system in this embodiment is as follows: as shown, Figure 2 After the transmitting coil 102B is powered on, magnetic flux is generated in the H-shaped magnetic flux concentrator 102A of the charging transmitting module 102, and the magnetic flux flows through the magnetic flux path shown in Figure 2 The magnetic flux path flowing in the H-shaped magnetic flux concentrator 102A is a high permeability path 105A, Figure 2105B represents a low permeability path, also known as the edge magnetic flux. Since the H-shaped magnetic flux concentrator 102A is made of materials such as cold-rolled grain-oriented (CRGO) steel sheet, its magnetic resistance is lower than that of the surrounding air, so that the magnetic flux is concentrated at the two ends 102C and 102D of the H-shaped magnetic flux concentrator 102A and flows between the air magnetic flux path 105B and the magnetic flux path 103A in the receiving module. The magnetic flux generates an induced current through the secondary winding 103A, achieving the purpose of energy transmission. Compared with the low permeability medium, this arrangement increases the magnetic flux through the high permeability medium, thereby increasing the mutual inductance between the charging transmitting module and the charging receiving module. Therefore, without increasing the loss and increasing the mutual inductance between the transmitting coil 102B and the secondary winding 103A, higher power can be provided to the load, thereby achieving faster charging of the electric vehicle.

[0030] In the present embodiment, as shown in Figure 3 The transmitting coil 102B includes a transmitting coil winding 403 and a coil skeleton 404, wherein the transmitting coil winding 403 is wound on the coil skeleton 404, specifically: the transmitting coil 102B is an H-shaped transmitting coil, and the coil skeleton is an H-shaped coil skeleton, which is stacked by long-grain-oriented steel sheets containing silicon and nickel. Such silicon-nickel steel sheets have the characteristics of high permeability and low magnetic loss at high frequencies, so that the transmitting coil can generate a stronger and more stable magnetic field when energized. The transmitting coil winding 403 is made of multiple strands of Litz enameled wire, and after the transmitting coil winding is wound on the coil skeleton, it is subjected to high-temperature drying and then immersed in insulating paint, and the outer surface of the transmitting coil winding is coated with insulating paint. The insulating paint plays the role of insulation and heat conduction. In the present embodiment, the transmitting coil 102B further includes a shell 401 and an upper cover plate 405, and the upper cover plate 405 covers the shell 401, and the transmitting coil winding 403 and the coil skeleton 404 are arranged inside the shell 401. Specifically, the shell is made of aluminum material, or other high polymer materials, which can effectively avoid the eddy current effect. In the high-frequency alternating current environment, the traditional metal shell is easy to generate eddy current due to electromagnetic induction, resulting in energy loss and shell heating. The shell material selection in the present embodiment solves this problem, reduces the unnecessary loss of energy in the transmission process, and improves the overall efficiency of the system.

[0031] In this embodiment, the bottom of the shell 401 is provided with a magnetic shielding reflector 402 made of iron oxide material for shielding electromagnetic field downward and emitting electromagnetic field upward, and the emitting coil winding 403 and the coil skeleton 404 are arranged above the magnetic shielding reflector 402, which is made of ferrite material, not only can shield electromagnetic field downward to prevent electromagnetic interference to underground facilities or surrounding environment, but also can reflect electromagnetic field upward to enhance the upper electromagnetic field emission, further optimize the magnetic field distribution, improve the coupling efficiency between the emitting coil and the secondary winding in the charging receiving module, help to maintain the stability of the system during charging, reduce the risk of energy fluctuation and charging interruption. And the internal space formed by the shell 401 and the upper cover plate 405 is filled with a filling material 406, which is a synthetic resin, for increasing strength and heat conduction, during the driving of the electric vehicle, the vibration of the ground, the extrusion of foreign objects and the like may affect the underground wireless charging system, and the internal filling material can effectively buffer these external forces to protect the key components such as the emitting coil and the magnetic flux concentrator inside from being damaged. In addition, the synthetic resin material also has good heat conductivity, which can help to dissipate the heat generated during system operation, further improving the reliability and durability of the system. In this embodiment, the upper cover plate 405 is a raised arc structure made of non-metallic material, which has good compression resistance and can withstand the pressure generated during driving or parking of the vehicle to prevent the upper cover from deforming or being damaged. At the same time, the arc structure can also prevent foreign matter from existing on the surface to avoid foreign matter entering the system and affecting its normal work, further improving the protection ability of the system and prolonging the service life of the system.

[0032] Embodiment two

[0033] The utility model provides a kind of electric vehicle, including a kind of wireless charging system for electric vehicle as provided in embodiment one, and charging receiving module is installed on electric vehicle. Other technical solutions and effects are same with embodiment one, and here no longer be described in detail.

[0034] The above only is preferred embodiment of the utility model, and is not used to limit the utility model, for the skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A wireless charging system for electric vehicles, characterized in that: include: A charging transmitter module and a charging receiver module; the charging transmitter module includes an H-shaped magnetic flux concentrator and a transmitting coil coupled to each other; the charging receiver module includes a secondary winding with a magnetic flux concentration, the secondary winding is located near the transmitting coil and is used to couple with the magnetic flux generated by the H-shaped magnetic flux concentrator to generate an induced current; The transmitting coil includes a transmitting coil winding and a coil frame, wherein the transmitting coil winding is wound on the coil frame.

2. A wireless charging system for electric vehicles according to claim 1, characterized in that: The charging and transmitting module also includes a grid connection module and a charge transfer module. The output end of the grid connection module is connected to the input end of the charge transfer module, and the output end of the charge transfer module is connected to the transmitting coil. The grid connection module is used to obtain external electrical energy and power the transmitting coil through the grid connection module.

3. A wireless charging system for electric vehicles according to claim 1, characterized in that: The wireless charging system further includes a lifting device, on which the charging transmitter module is mounted, and is configured to adjust the height of the charging transmitter module according to the position of the charging receiver module.

4. A wireless charging system for electric vehicles according to claim 1, characterized in that: The transmitting coil is an H-shaped transmitting coil, wherein the coil skeleton is an H-shaped coil skeleton; the transmitting coil further comprises a shell and an upper cover plate, the upper cover plate is covered on the shell, and the transmitting coil and the coil skeleton are inside the shell.

5. A wireless charging system for electric vehicles as claimed in claim 4, characterized in that: The bottom of the shell is provided with a magnetic isolation reflector made of iron oxide material, which is used to isolate the electromagnetic field downward and transmit the electromagnetic field upward. The transmitting coil winding and coil frame are arranged above the magnetic isolation reflector.

6. A wireless charging system for electric vehicles as claimed in claim 4, characterized in that: The inner space formed by the shell and the upper cover is filled with a filling material, which is a synthetic resin for increasing strength and heat conduction, and the upper cover is a convex arc structure made of non-metallic material.

7. A wireless charging system for electric vehicles as claimed in claim 4, characterized in that: The shell is made of aluminum; the H-shaped coil skeleton is made of long-grain oriented steel plates containing silicon and nickel; and the transmitting coil winding is made of multiple strands of Litz enameled wire.

8. The wireless charging system for electric vehicles according to claim 1, wherein: The outer surface of the transmitting coil winding after being wound around the coil frame is coated with insulating paint for insulation and heat conduction.

9. The wireless charging system for electric vehicles according to claim 1, wherein: The H-shaped magnetic flux concentrator is made of cold-rolled oriented steel plate.

10. An electric vehicle, characterized in that: It comprises a wireless charging system for an electric vehicle as described in any one of claims 1 to 9, and the charging receiving module is installed on the electric vehicle.

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