Wireless charging system, wireless charging station, wireless charging method and electric vehicle charging method

Abstract

This invention discloses a wireless charging system, a wireless charging station, a wireless charging method, and a method for charging electric vehicles, belonging to the field of wireless charging technology. It includes: multiple wireless charging transmitters located within a wireless charging station; each transmitter receives a charging preparation request from an electric vehicle, guides the electric vehicle to a available location of the transmitter, obtains charging matching parameters corresponding to the charging request, and wirelessly charges the electric vehicle based on the matching parameters; and a wireless charging receiver located on the electric vehicle and communicatively connected to the available transmitters. The beneficial effects of this technical solution are: by adopting the above technical solution, each charging device can provide wireless charging services for different electric vehicles, improving the utilization rate of the wireless charging station.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and more particularly to wireless charging systems, wireless charging stations, wireless charging methods, and electric vehicle charging methods. Background Technology

[0002] Wireless charging technology is convenient and contactless, making it suitable for various application environments. It also facilitates automatic charging after automatic parking. Current wireless charging technology involves electric vehicles sending wireless connection authentication to a wireless charging transmitter at a fixed location. After successful authentication, it determines whether the electric vehicle needs wireless charging and activates the wireless charging function based on wireless communication authentication.

[0003] In existing technologies, wireless charging for electric vehicles can only be paired one-to-one, meaning that an electric vehicle with wireless charging can only be charged on the corresponding wireless charging and transmitting device. This makes it impossible for different charging devices within a wireless charging station to provide wireless charging services for different electric vehicles, resulting in low utilization of wireless charging stations. Summary of the Invention

[0004] The purpose of this invention is to provide a wireless charging system that solves the above-mentioned technical problems;

[0005] The present invention also aims to provide a wireless charging method for a wireless charging station, thereby solving the above-mentioned technical problems;

[0006] The present invention also aims to provide a wireless charging method for electric vehicles to solve the above-mentioned technical problems;

[0007] A wireless charging system, comprising:

[0008] Multiple wireless charging transmitters are installed in a wireless charging station. Each wireless charging transmitter receives a charging preparation request from an electric vehicle, guides the electric vehicle to an available location of the wireless charging transmitter, obtains charging matching parameters corresponding to the charging request, and performs wireless charging for the electric vehicle based on the charging matching parameters.

[0009] A wireless charging receiver is mounted on the electric vehicle and is communicatively connected to the available wireless charging transmitter.

[0010] Preferably, each of the wireless charging transmitters and the wireless charging receivers has different signal strengths and response time differences, and the wireless charging transmitter with the strongest signal strength and the shortest response time difference is used as the available wireless charging transmitter to communicate with the wireless charging receiver.

[0011] Preferably, the charging matching parameters include charging time and charging mode. The charging time is the charging time required by the electric vehicle based on the available state of the remaining battery power. The charging mode includes a fast charging mode and a slow charging mode. The input power of the fast charging mode is 11kW or 22kW, and the input power of the slow charging mode is 7.7kW.

[0012] Preferably, each of the wireless charging transmitters includes:

[0013] The wireless communication transmitter module transmits communication signals.

[0014] The position signal transmitting module transmits the first set of signals;

[0015] A power transmission control module controls the transmission power of the wireless charging transmitter.

[0016] The wireless charging transmitter is also connected to a power source for power supply.

[0017] Preferably, the wireless charging receiver further includes:

[0018] A power pickup module is connected to the vehicle battery, and the power pickup module and the wireless charging transmitter are electromagnetically induced.

[0019] A wireless communication receiving module receives communication signals transmitted by the wireless communication transmitting module and performs pairing.

[0020] The location signal feedback module receives the first set of signals transmitted by the location signal transmitting module and feeds back the second set of signals to determine the distance information between the electric vehicle and the available wireless charging transmitter.

[0021] Preferably, the wireless charging transmitter further includes a security detection unit, comprising:

[0022] The foreign object detection module detects whether there are foreign objects in the charging area;

[0023] The biological detection module issues a power reduction command or a pause command when it detects a biological object entering the charging area during the charging process.

[0024] Electromagnetic field environment monitoring module, which monitors the electromagnetic field strength in the charging area;

[0025] The safety detection unit is a combination of the foreign object detection module, the biological body detection module and the electromagnetic field environment monitoring module. When a foreign object or biological body is detected entering the charging area, the power transmission control module reduces the power based on the intensity of the electromagnetic field so that the intensity of the electromagnetic field is reduced to the point where charging stops.

[0026] A wireless charging method for a wireless charging station, applied to the aforementioned wireless charging system, includes:

[0027] Step S101: The wireless charging transmitter performs power-on initialization;

[0028] Step S102: The wireless charging transmitter establishes a wireless network connection with the wireless charging receiver of the electric vehicle. If the wireless network connection is successfully detected, step S103 is executed; otherwise, step S102 is repeated.

[0029] Step S103: Perform communication initialization service. If the charging preparation request of the electric vehicle is received, execute step S104; otherwise, repeat step S103.

[0030] Step S104: Perform a position guidance alignment operation on the electric vehicle. If the alignment operation is completed, proceed to step S105; otherwise, repeat step S104.

[0031] Step S105: The wireless charging system performs pairing. When successful pairing is detected, it receives the charging request sent by the electric vehicle and performs a security check, then executes step S106. Otherwise, it sends a charging rejection message to the electric vehicle and repeats step S104.

[0032] Step S106: Determine whether charging is allowed. If yes, proceed to step S107. If no, send a message indicating the end of the charging process and re-execute step S103.

[0033] Step S107: Perform alignment confirmation detection again to determine whether the alignment is complete. If yes, enter the charging state; otherwise, proceed to step S104.

[0034] Preferably, after the alignment confirmation detection in step S107 is completed, and the electric vehicle enters the charging state until charging is complete, step S106 is executed, and if the wireless charging transmitter is detected to be not allowed to charge, the charging process ends.

[0035] A wireless charging method for electric vehicles, applied to the aforementioned wireless charging system, includes:

[0036] Step S201: The electric vehicle enters the signal coverage area of ​​the wireless charging station;

[0037] Step S202: Activate the wake-up mechanism of the wireless charging transmitter and enter the system power-on initialization state;

[0038] Step S203: The system enters wireless terminal mode;

[0039] In step S204, the electric vehicle scans the surrounding SSIDs and signal strengths, and selects the WPT system AP with the strongest signal to connect. If the connection is successful, step S205 is executed; otherwise, step S204 is repeated.

[0040] Step S205: The electric vehicle communicates according to the communication process to determine whether the pairing is successful. If yes, proceed to step S206. If no, set the AP to the blacklist and repeat step S204.

[0041] Step S206: Lock the AP's SSID and WLAN reset connection, and determine whether the access is successful. If yes, proceed to step S207; if no, repeat step S206.

[0042] Step S207: The electric vehicle communicates according to the communication process, switches to the charging preparation process, and starts charging;

[0043] In step S208, charging ends, the system is reset, and step S206 is repeated.

[0044] Preferably, after the electric vehicle charging is completed in step S208, the electric vehicle drives away from the charging area, and step S203 is repeated.

[0045] The beneficial effects of the present invention are as follows: by adopting the above technical solutions, the present invention provides a wireless charging system, a wireless charging station, a wireless charging method, and a vehicle charging method, enabling each charging device to provide wireless charging services for different electric vehicles and improving the utilization rate of wireless charging stations. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the modules of the wireless charging system in a preferred embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a preferred embodiment of the present invention, taking one of a plurality of wireless charging transmitters as an example;

[0048] Figure 3 This is a schematic diagram of a wireless charging receiver in a preferred embodiment of the present invention.

[0049] Figure 4 This is a preferred embodiment of the present invention, showing the steps of a wireless charging method for a wireless charging station.

[0050] Figure 5 This is a preferred embodiment of the present invention, showing the steps of a wireless charging method for electric vehicles.

[0051] Figure 6This is a preferred embodiment of the present invention, showing a charging flowchart of a wireless charging method for a wireless charging station.

[0052] Figure 7 This is a preferred embodiment of the present invention, showing a charging flowchart of a wireless charging method for electric vehicles.

[0053] In the attached diagram: 1. Electric vehicle; 11. Wireless charging receiver; 12. Wireless communication receiving module; 13. Position signal feedback module; 14. Power pickup module; 15. Vehicle battery; 2. Wireless charging station; 21. Wireless charging transmitter; 22. Power transmission control module; 23. Wireless communication transmission module; 24. Position signal transmission module; 25. Foreign object detection module; 26. Biological object detection module; 27. Electromagnetic field environment monitoring module. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0056] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0057] A wireless charging system, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes:

[0058] Multiple wireless charging transmitters 21: wireless charging transmitter 21a, wireless charging transmitter 21b, and wireless charging transmitter 21c are installed in the wireless charging station 2. The wireless charging transmitter 21 receives a charging preparation request from an electric vehicle, guides the electric vehicle to the available wireless charging transmitter 21, obtains the charging matching parameters corresponding to the charging request, and performs wireless charging for the electric vehicle based on the charging matching parameters.

[0059] A wireless charging receiver 11 is installed on an electric vehicle and is communicatively connected to a usable wireless charging transmitter 21.

[0060] Specifically, the present invention provides a wireless charging system, which is mainly used for wireless charging. The system receives a charging preparation request from an electric vehicle 1 through a wireless charging transmitter 21 in a wireless charging station 2. The electric vehicle 1 and the wireless charging transmitter 21 are positioned to guide each other. The wireless charging transmitter 21 obtains charging matching parameters corresponding to the charging request according to the charging request, thereby realizing wireless charging for the electric vehicle.

[0061] In a preferred embodiment, each wireless charging transmitter 21 and the wireless charging receiver 11 have different signal strengths and response time differences, and the wireless charging transmitter 21 with the strongest signal strength and the shortest response time difference is used as the available wireless charging transmitter 21 to communicate with the wireless charging receiver 11.

[0062] In a preferred embodiment, the charging matching parameters include charging time and charging mode. The charging time is the charging time required for the electric vehicle based on the available state of the remaining battery power. The charging mode includes a fast charging mode and a slow charging mode. The input power of the fast charging mode is 11kW or 22kW, and the input power of the slow charging mode is 7.7kW.

[0063] In a preferred embodiment, taking one of the plurality of wireless charging transmitters 21, for example, wireless charging transmitter 21b, as an example, it includes:

[0064] Wireless communication transmitter module 23 transmits communication signals;

[0065] Position signal transmitting module 24 transmits the first set of signals;

[0066] The power transmission control module 22 controls the transmission power of the wireless charging transmitter 21.

[0067] The wireless charging transmitter 21 is also connected to a power source for power supply.

[0068] Specifically, when electric vehicle 1 enters the wireless communication range of each wireless charging transmitter 21 within wireless charging station 2, it initiates a scan of the SSID of each wireless charging transmitter 21 within wireless charging station 2. Based on the strength of the information, it determines the distance between the wireless charging transmitter 21 and electric vehicle 1, optimizing for the closest and most convenient SSID that can be simultaneously assigned to the wireless charging area. After a successful connection, communication is performed according to the communication process. Once a handshake is successful, electric vehicle 1 locks the SSID of the corresponding wireless charging transmitter 21 within wireless charging station 2 and hides its SSID as a Wi-Fi hotspot during charging. At this time, other electric vehicles 1 with wireless charging capabilities cannot scan the SSID of this transmitter, thus fulfilling the network security requirements between the transmitters of wireless charging station 2 and electric vehicle 1.

[0069] Furthermore, the charging preparation request is matched with the charging permissions pre-stored in each transmitter in the wireless charging station 2. If the charging request information issued by electric vehicle 1 matches the pre-stored charging permissions of the transmitter in the wireless charging station 2, the preparation work before wireless charging is started. If it is found that the charging request issued by electric vehicle 1 does not match the pre-stored charging permissions of each transmitter in the wireless charging station 2, the communication initialization service is restarted. The communication initialization service feeds back to electric vehicle 1 that the charging permissions do not match, and electric vehicle 1 then handles the matter itself to restart the connection work of other transmitters in the new wireless charging station, or does not execute the wireless charging preparation request.

[0070] In a preferred embodiment, the wireless charging receiver 11 further includes:

[0071] The power pickup module 14 is connected to the vehicle battery 15 and outputs a stable DC power to charge the vehicle power battery. The power pickup module 14 and the wireless charging transmitter 21 perform electromagnetic induction. In the communication method between the receiving device of the electric vehicle 1 and the transmitter in the wireless charging station 2, the electric vehicle 1 achieves the power transmission function by aligning the receiving device of the vehicle with the transmitter in the wireless charging station 2 during the charging process.

[0072] The wireless communication receiving module 12 receives the communication signals transmitted by the wireless communication transmitting module 23 and performs pairing.

[0073] The location signal feedback module 13 receives the first set of signals transmitted by the location signal transmitting module 24 and feeds back the second set of signals, generating a time difference to determine the distance information between the electric vehicle and the available wireless charging transmitter 21.

[0074] Specifically, the transmitter emits a first set of signals via radio frequency, the electric vehicle 1 receives the first set of signals, and simultaneously feeds back a second set of signals. Based on the time difference between the first and second sets of signals, the system calculates the distance information between them and guides the electric vehicle 1 to move so that the receiving coil in the receiver of the electric vehicle 1 is aligned with the transmitting coil of the wireless charging transmitter 21.

[0075] Furthermore, after the electric vehicle 1 aligns with the wireless transmitter in the wireless charging station 2, system pairing is performed. The system pairing information includes: charging time and charging mode. The charging time is calculated by the electric vehicle 1 based on the remaining SOC of the battery. The charging mode refers to whether to select a three-phase 11kW / 22kW or even higher power fast charging mode or a single-phase 7.7kWmax slow charging mode. System information matching ensures that the system parameters of the two sides are consistent during wireless charging. If the system pairing between the two sides fails, such as when the battery is fully charged or the wireless charging device in the wireless charging station does not support the charging mode, the wireless charging step cannot be initiated further.

[0076] In a preferred embodiment, the wireless charging transmitter 21 further includes a safety detection unit for checking the wireless charging environment, comprising:

[0077] The foreign object detection module 25 detects whether there are foreign objects in the charging area that are easily heated in a strong magnetic field, such as metal coins, carbon fibers, etc.

[0078] The biological detection module 26 issues a power reduction command or a pause command when it detects a biological entity entering the charging area during the charging process.

[0079] Electromagnetic field environment monitoring module 27 monitors the electromagnetic field strength in the charging area;

[0080] The safety detection unit consists of a foreign object detection module 25, a biological object detection module 26, and an electromagnetic field environment monitoring module 27. When a foreign object or biological object enters the charging area, the power transmission control module 22 reduces the power based on the strength of the electromagnetic field, thereby reducing the intensity of the electromagnetic field or even pausing wireless charging to reduce the harm of the electromagnetic field to the biological object.

[0081] Specifically, the safety detection refers to checking whether the wireless charging environment is safe and meets safety requirements. It includes a foreign object detection module 25, a biological object detection module 26, and an electromagnetic field environment monitoring module 27 around the electric vehicle 1. If an abnormality is detected, it determines whether charging can be allowed. If it determines that wireless charging cannot be performed, the charging process ends and the system prompts the user to find another transmitter. The system continues to work until the electric vehicle 1 finishes charging and leaves the area of ​​the transmitter, connects to a new SSID, and then the transmitter initializes and releases the SSID signal again.

[0082] Furthermore, after the wireless charging transmitter and receiver pass the safety detection process, the system performs a final alignment confirmation to ensure that the center of the transmitting coil in the transmitter device and the center of the receiving coil in the receiver device are aligned, or that the alignment range between the two is within the range specified by national industry standards (e.g., X+ / -100mm, Y+ / -100mm). If there is a deviation, the electric vehicle needs to be readjusted. At that time, due to the further maturity of automatic parking technology, the automatic parking technology, combined with the position signal transmission module 24 of the transmitter device and the position signal feedback module 13 of the receiver device, can ensure the center positioning accuracy of the center of the transmitting coil in the transmitter device and the center of the receiving coil in the receiver device. The deviation is within a controllable range, thereby ensuring the charging efficiency during the charging process and reducing power loss during the charging process.

[0083] Furthermore, during the charging process, the foreign object detection module 25, the biological object detection module 26, and the electromagnetic field environment monitoring module 27 of the transmitting device, along with power transmission, ensure that no foreign objects enter the charging area at all times. Since wireless charging is based on the principle of converting magnetism into electricity, there is a risk that metallic foreign objects may overheat or even burn in a high magnetic field environment. At the same time, small animals or people may enter the charging area during the charging process. In this case, the biological object detection comes into play to protect living beings from harm. Meanwhile, the electromagnetic field environment monitoring module 27 also reduces the power of the charging system based on the intensity of the electromagnetic field after someone enters the charging radiation area, thereby reducing the intensity of the electromagnetic field to a level that does not cause harm to the human body.

[0084] More specifically, the wireless charging transmitter releases its SSID signal after power-on initialization. Electric vehicles (EVs) requiring wireless charging can scan the SSID and, based on signal strength and the optimal resource allocation principle within the wireless charging station (2), allocate parking spaces with wireless charging transmitters. At this point, EV1 establishes a wireless communication connection with the wireless charging transmitter (21), indicating successful pairing. This allows the system to proceed to the next step of checking for charging requests from EV1. Simultaneously, EV1 blacklists previously failed pairings of SSIDs to record instances where wireless charging services cannot be provided in a timely manner due to obstructions or other reasons. For example, if EV1 is only briefly charging at this wireless charging station (21),... The vehicle is temporarily parked, and cannot proceed to the next step of wireless charging. The wireless charging transmitter 21 does not perform alignment guidance. The electric vehicle 1 can park in this parking space, but cannot perform charging operations. At the same time, the foreign object detection module 25 and the biological object detection module 26 of the transmitter, together with the position signal transmission module 24, detect the electric vehicle 1 as a large foreign object and issue a parking space abnormality reminder function to remind the driver of the electric vehicle 1 to leave the parking space as soon as possible. After the communication signal of the electric vehicle 1 and the transmitter in the wireless charging station 2 are successfully paired, the vehicle receiver locks the SSID of this AP and resets the WLAN connection. At the same time, the SSID of the transmitter is hidden, and other electric vehicles 1 cannot obtain this SSID by scanning.

[0085] A wireless charging method for a wireless charging station, used in a wireless charging system, such as... Figure 4 , Figure 6 As shown, it includes:

[0086] Step S101: The wireless charging transmitter 21 performs power-on initialization;

[0087] In step S102, the wireless charging transmitter 21 establishes a wireless network connection with the wireless charging receiver 11 of the electric vehicle. If the wireless network connection is successfully detected, step S103 is executed; otherwise, step S102 is repeated.

[0088] Step S103: Perform communication initialization service. If a charging preparation request from an electric vehicle is received, proceed to step S104; otherwise, repeat step S103.

[0089] Step S104: Perform an alignment operation to guide the electric vehicle to a position. If the alignment operation is completed, proceed to step S105; otherwise, repeat step S104.

[0090] Step S105: The wireless charging system performs pairing. When successful pairing is detected, it receives the charging request sent by the electric vehicle and performs a security check, then executes step S106. Otherwise, it sends a charging rejection message to the electric vehicle and repeats step S104.

[0091] Step S106: Determine whether charging is allowed. If yes, proceed to step S107. If no, send a message indicating the end of the charging process and re-execute step S103.

[0092] Step S107: Perform alignment confirmation detection again to determine whether the alignment is complete. If yes, enter the charging state; otherwise, proceed to step S104.

[0093] Specifically, a wireless charging method for a wireless charging station is provided, which enables communication handshake connection between a new energy vehicle and a transmitter in the wireless charging station 2, and a method for system charging, as well as a corresponding wireless charging station 2 with a wireless receiver and a wireless transmitter.

[0094] In a preferred embodiment, after the alignment confirmation detection in step S107 is completed and the electric vehicle enters the charging state until charging is complete, step S106 is executed. If the wireless charging transmitter 21 is detected as not allowing charging, the charging process ends.

[0095] Specifically, when the transmitter in the wireless charging station 2 determines that the electric vehicle 1 has wireless communication capabilities, the electric vehicle 1 has a wireless charging receiver 11, and the electric vehicle 1 enters the WIFI signal coverage area of ​​the wireless charging station 2, generally when the electric vehicle 1 enters the range centered on the wireless charging station 2 (such as the 1000-meter range in the prior art), it activates the wake-up mechanism of the transmitter within the range of the wireless charging station 2, enters the system power-on initialization state to provide power and signals for the subsequent operation steps, and at this time the system enters STA mode.

[0096] Furthermore, in order to achieve the purpose of wireless charging between the transmitter in the wireless charging station 2 and the electric vehicle 1, a wireless communication connection is first required. The wireless communication connection method can be any of the existing technologies such as Bluetooth, WIFI, Zigbee, RFID, NFC, etc., or a combination of two or more technologies can be used to achieve this function.

[0097] This embodiment further illustrates the use of WIFI technology: Electric vehicle 1 scans the SSID and signal strength of surrounding APs, connects to the optimized transmitting device area within wireless charging station 2 based on the signal strength, and initiates wireless communication between electric vehicle 1 and wireless charging station 2. Electric vehicle 1 communicates according to the communication process. After successful pairing, the system locks the SSID of wireless charging station 2 and resets the current WLAN. This reset connection is only performed between the transmitting devices of electric vehicle 1 and wireless charging station 2 to disable the SSID signal previously transmitted by wireless charging station 2 and to disable the scanning action of electric vehicle 1. After successful access, communication will proceed according to the communication process, switching to the communication initialization service. If the charging preparation permissions identified by the communication process are inconsistent, the system will switch back to the initial state of the electric vehicle.

[0098] After receiving the charging command from the electric vehicle 1, the transmitter in the wireless charging station 2 performs an alignment operation. To enhance the signal strength between the electric vehicle 1 and the transmitter in the wireless charging station 2, and the coupling coefficient between the transmitting and receiving coils of the wireless charging, thereby achieving the optimal state of wireless charging, the alignment of the electric vehicle 1 relative to the transmitter in the wireless charging station 2 can be limited to infrared sensors, ultrasonic radar, cameras, etc. The example disclosed in this invention adds signal transmitters and feedback devices to both ends of the electric vehicle 1 and the transmitter in the wireless charging station 2. Specifically, the wireless charging station 2 emits a first set of signals, the electric vehicle 1 receives the first set of signals, and simultaneously feeds back a second set of signals. Based on the time difference between the first and second sets of signals, the system calculates the distance information between them and guides the electric vehicle 1 to move, so that the receiving coil on the electric vehicle 1 is aligned with the transmitting coil on the wireless charging station 2.

[0099] After the alignment is completed, the wireless charging system performs a pairing operation. Electric vehicle 1 aligns with the transmitter and performs system pairing. The system pairing information includes: charging time and charging mode. The charging time is calculated by electric vehicle 1 based on the remaining battery SOC. The charging mode refers to whether to select a three-phase 11kW or 22kW or even higher power charging mode or a single-phase 7.7kWmax charging mode. The system information is matched to ensure the consistency of system parameters for wireless charging on both sides. If the system pairing on both sides fails, such as when the battery is fully charged or the wireless charging station 2 does not support the charging mode, the wireless charging process cannot be initiated further. At this time, the wireless charging station 2 will send a wireless charging refusal message to electric vehicle 1. In future commercial development, a remote APP can be developed to display this information on mobile phones and computers for easy reminders to users.

[0100] Safety verification refers to checking whether the wireless charging environment is safe and meets safety requirements. It includes metal foreign object detection, biological object detection, and the electromagnetic field environment around the electric vehicle. If an abnormality is detected, it is determined whether charging can be allowed. If wireless charging cannot be performed, the entire charging process ends, and the system prompts to search for other transmitting device resources. This continues until the electric vehicle 1 finishes charging and leaves the transmitting device area. The position signal, combined with the foreign object detection module 25, detects that the electric vehicle is no longer above the transmitting device. The system then concludes that the vehicle has left the transmitting device area, and the transmitting device initializes and re-releases the SSID signal to meet the charging needs of the next electric vehicle 1. In addition, the departing electric vehicle 1 also initializes and can scan the surrounding SSID signals.

[0101] If the safety check is passed and charging is allowed, and a charging request instruction is received from electric vehicle 1, the system will proceed to the final alignment confirmation of wireless charging to ensure the optimal coupling coefficient between the wireless charging station 2 and the coil of electric vehicle 1. If the alignment is incorrect, the system will re-enter the alignment operation process. After confirming the optimal charging position of the system, the system will enter the charging state, and the monitoring steps will also be performed simultaneously.

[0102] It should also be noted that, in addition to power selection, the charging mode between electric vehicle 1 and the transmitter in wireless charging station 2 can also be limited to temporary charging of the system, charging modes with lower power requirements (such as 3.3kW, 2kW, 1kW), and various auxiliary functions can be further developed in wireless charging, such as adaptive economic charging function (charging during off-peak hours) and bidirectional wireless charging function (for outdoor operation needs).

[0103] Once charging is complete, electric vehicle 1 enters a charging permission check. Wireless charging station 2 can determine whether charging is permitted based on whether charging is allowed. If the electric vehicle's battery is full and does not meet the requirements for permitted charging, the charging process ends. At the same time, the wireless communication (such as WIFI) between electric vehicle 1 and wireless charging station 2 is automatically disconnected. At this time, the WIFI signal remains hidden. Only when electric vehicle 1 leaves the area of ​​the transmitting device, the position signal inside the transmitting device, combined with the foreign object detection module 25, detects that the electric vehicle is no longer above the transmitting device. The system then concludes that the vehicle has left the area of ​​the transmitting device, and the transmitting device initializes and releases the SSID signal again so that the next electric vehicle 1 can charge.

[0104] A wireless charging method for electric vehicles, applied to a wireless charging system, such as... Figure 5 , Figure 7 As shown, it includes:

[0105] Step S201: The electric vehicle enters the signal coverage area of ​​the wireless charging station 2;

[0106] Step S202: Activate the wake-up mechanism of the wireless charging transmitter 21 and enter the system power-on initialization state;

[0107] Step S203: The system enters wireless terminal mode;

[0108] Step S204: The electric vehicle scans the surrounding SSIDs and signal strengths, and selects the WPT system AP with the strongest signal to connect. If the connection is successful, proceed to step S205; otherwise, repeat step S204.

[0109] Step S205: The electric vehicle communicates according to the communication process to determine whether the pairing is successful. If yes, proceed to step S206. If no, set the AP to the blacklist and repeat step S204.

[0110] Step S206: Lock the AP's SSID and reset the WLAN connection. Determine if the connection is successful. If yes, proceed to step S207. If no, repeat step S206.

[0111] In step S207, the electric vehicle communicates according to the communication process, switches to the charging preparation process, and starts charging;

[0112] In step S208, charging ends, the system is reset, and step S206 is repeated.

[0113] Specifically, a wireless charging method for electric vehicles is provided, which can match the charging preparation request of electric vehicle 1 with the charging permission information pre-stored in wireless charging station 2 to achieve wireless charging, thereby increasing the security of wireless charging and ensuring that wireless charging station 2 is not stolen.

[0114] In a preferred embodiment, after the electric vehicle finishes charging in step S208, the electric vehicle leaves the charging area, and step S203 is repeated.

[0115] In summary, this application provides a wireless charging system, a wireless charging station, a wireless charging method, and a vehicle charging method. It simply realizes the functions of positioning alignment, communication handshake, security check, environmental monitoring, and power transmission between the transmitter in the wireless charging station and the receiver in the electric vehicle. It matches the electric vehicle's charging preparation request with the charging permission information pre-stored in the wireless charging station to achieve wireless charging, increasing the security of wireless charging and ensuring that the wireless charging station is not subject to power theft. It also optimizes the resources within the wireless charging station, guiding the electric vehicle to position itself with the transmitter in an empty parking space to achieve power transmission charging, realizing resource sharing and maximizing the utilization of the wireless charging station. Through guidance information within the wireless charging system, the vehicle is connected to the wireless transmitter within the charging station that can release data, and charging is performed in an appropriate manner, thereby enabling the widespread application of wireless charging for electric vehicles and avoiding resource waste in the wireless charging station. Furthermore, the composition of each functional module is not limited to this; in actual implementation, these functional modules can be described in other ways or with other names, and the wireless charging method and functional modules can be freely combined.

[0116] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A wireless charging system, characterized in that, include: Multiple wireless charging transmitters are installed in a wireless charging station. Each wireless charging transmitter receives a charging preparation request from an electric vehicle, guides the electric vehicle to an available location of the wireless charging transmitter, obtains charging matching parameters corresponding to the charging request, and performs wireless charging for the electric vehicle based on the charging matching parameters. A wireless charging receiver is mounted on the electric vehicle and is communicatively connected to the available wireless charging transmitter. Each wireless charging transmitter and the wireless charging receiver have different signal strengths and response time differences. The wireless charging transmitter with the strongest signal strength and the shortest response time difference is used as the wireless charging transmitter and the wireless charging receiver for communication connection. Each of the wireless charging transmitters includes: The wireless communication transmitter module transmits communication signals. The position signal transmitting module transmits the first set of signals; A power transmission control module controls the transmission power of the wireless charging transmitter. The wireless charging transmitter is also connected to a power source for power supply. When the electric vehicle enters the wireless communication range of each wireless charging transmitter in the wireless charging station, it initiates a scan of the SSIDs of each wireless charging transmitter in the wireless charging station and determines the distance between each wireless charging transmitter and the electric vehicle based on the strength of the information. It then optimizes the allocation of SSIDs to the nearest and most convenient area where wireless charging can be performed. After a successful connection, communication is performed according to the communication process. After a successful handshake, the electric vehicle locks the SSID of the corresponding wireless charging transmitter in the wireless charging station. During the charging process, the locked SSID is hidden as a Wi-Fi hotspot to prevent other electric vehicles from scanning the locked SSID.

2. The wireless charging system according to claim 1, characterized in that, The charging matching parameters include charging time and charging mode. The charging time is the charging time required by the electric vehicle based on the available state of the remaining battery power. The charging mode includes fast charging mode and slow charging mode. The input power of fast charging mode is 11kW or 22kW, and the input power of slow charging mode is 7.7kW.

3. The wireless charging system according to claim 1, characterized in that, The wireless charging receiver also includes: A power pickup module is connected to the vehicle battery, and the power pickup module and the wireless charging transmitter are electromagnetically induced. A wireless communication receiving module receives communication signals transmitted by the wireless communication transmitting module and performs pairing. The location signal feedback module receives the first set of signals transmitted by the location signal transmitting module and feeds back the second set of signals to determine the distance information between the electric vehicle and the available wireless charging transmitter.

4. The wireless charging system according to claim 1, characterized in that, The wireless charging transmitter also includes a security detection unit, comprising: The foreign object detection module detects whether there are foreign objects in the charging area; The biological detection module issues a power reduction command or a pause command when it detects a biological object entering the charging area during the charging process. Electromagnetic field environment monitoring module, which monitors the electromagnetic field strength in the charging area; The safety detection unit is a combination of the foreign object detection module, the biological body detection module and the electromagnetic field environment monitoring module. When a foreign object or biological body is detected entering the charging area, the power transmission control module reduces the power based on the intensity of the electromagnetic field so that the intensity of the electromagnetic field is reduced to the point where charging stops.

5. A wireless charging method for a wireless charging station, characterized in that, The wireless charging system according to any one of claims 1-4 includes: Step S101: The wireless charging transmitter performs power-on initialization; Step S102: The wireless charging transmitter establishes a wireless network connection with the wireless charging receiver of the electric vehicle. If the wireless network connection is successfully detected, step S103 is executed; otherwise, step S102 is repeated. Step S103: Perform communication initialization service. If the charging preparation request of the electric vehicle is received, execute step S104; otherwise, repeat step S103. Step S104: Perform a position guidance alignment operation on the electric vehicle. If the alignment operation is completed, proceed to step S105; otherwise, repeat step S104. Step S105: The wireless charging system performs pairing. When successful pairing is detected, it receives the charging request sent by the electric vehicle and performs a security check, then executes step S106. Otherwise, it sends a charging rejection message to the electric vehicle and repeats step S104. Step S106: Determine whether charging is allowed. If yes, proceed to step S107. If no, send a message indicating the end of the charging process and re-execute step S103. Step S107: Perform alignment confirmation detection again to determine whether the alignment is complete. If yes, enter the charging state; otherwise, proceed to step S104.

6. The wireless charging method for a wireless charging station according to claim 5, characterized in that, Once the alignment confirmation detection in step S107 is completed, and the electric vehicle enters the charging state until charging is complete, step S106 is executed. If the wireless charging transmitter is detected to be not allowed to charge, the charging process ends.

7. A wireless charging method for electric vehicles, characterized in that, The wireless charging system according to any one of claims 1-4 includes: Step S201: The electric vehicle enters the signal coverage area of ​​the wireless charging station; Step S202: Activate the wake-up mechanism of the wireless charging transmitter and enter the system power-on initialization state; Step S203: The system enters wireless terminal mode; In step S204, the electric vehicle scans the surrounding SSIDs and signal strengths, and selects the WPT system AP with the strongest signal to connect. If the connection is successful, step S205 is executed; otherwise, step S204 is repeated. Step S205: The electric vehicle communicates according to the communication process to determine whether the pairing is successful. If yes, proceed to step S206. If no, set the AP to the blacklist and repeat step S204. Step S206: Lock the AP's SSID and WLAN reset connection, and determine whether the access is successful. If yes, proceed to step S207; if no, repeat step S206. Step S207: The electric vehicle communicates according to the communication process, switches to the charging preparation process, and starts charging; In step S208, charging ends, the system is reset, and step S206 is repeated.

8. The wireless charging method for electric vehicles according to claim 7, characterized in that, After the electric vehicle finishes charging in step S208, the electric vehicle leaves the charging area, and step S203 is repeated.

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