Magnetic type wireless charging equipment and charging method for electric bicycle

Abstract

The invention provides an electric bicycle magnetic attraction type wireless charging device and a charging method.The electric bicycle magnetic attraction type wireless charging device comprises a magnetic attraction type wireless charging receiving end module and a magnetic attraction type wireless charging transmitting end module, and the magnetic attraction type wireless charging receiving end module is connected with an electric bicycle driving battery through an electric bicycle external charging port; the electric bicycle driving battery is arranged below an electric bicycle seat, the magnetic attraction wireless charging transmitting end module is arranged outside an electric bicycle through a supporting frame, and the magnetic attraction wireless charging transmitting end module and the magnetic attraction wireless charging receiving end module are connected in a magnetic attraction mode to charge the electric bicycle driving battery. The invention provides electric bicycle wireless charging equipment with a magnetic attraction function and a charging method. And the charging safety of the electric bicycle can be fundamentally improved. And safety accidents caused by mismatching of the charger and the battery or poor contact of the charger and the like are avoided.

Description

Technical Field

[0001] The present invention belongs to the field of electric bicycles and relates to a magnetic wireless charging device and a charging method for electric bicycles. Background Art

[0002] According to national mandatory standards, electric bicycles refer to vehicles that are driven by electric motors and have the ability to be pedaled, such as electric bicycles and electric scooters. Electric bicycles have brought great convenience to people's daily lives. However, on the other hand, problems such as improper charging have also brought many safety hazards and safety accidents. In 2021, there were as many as 18,000 fires caused by electric bicycles in my country. This is almost six times the number of fires caused by electric vehicles. In particular, the number of electric bicycle fire accidents continues to increase every year due to reasons such as illegal wiring, charging in corridors, aging batteries, charging port problems, and weather. According to statistics from the first quarter of 2022, it increased by 36% compared with the same period in 2021. Electric bicycles require safer charging methods.

[0003] Meanwhile, shared electric bikes are already widely used both domestically and internationally. Beyond the aforementioned charging safety risks, this sector also presents issues like random parking, significant operational costs, and a significant impact on urban appearance. Some cities have even banned electric bikes for this very reason. However, electric bikes do bring significant convenience to people's lives, especially for short-distance travel within three kilometers, and are irreplaceable for industries like express delivery and food delivery.

[0004] At the same time, in the past few years, wireless charging technology has been widely used in terminal devices such as mobile phones and wearable devices such as headphones and smart watches. This has greatly facilitated the convenience of charging and provided users with new and interesting charging options and charging experiences.

[0005] However, the biggest advantage of wireless charging lies in safety. This is especially true for power transmission exceeding hundreds of watts, especially in harsher environments like outdoors. This has made wireless charging for e-bikes a research and development hotspot in recent years.

[0006] It should be noted that some electric bicycle charging methods already use magnetic wireless charging. However, this method is similar to a car gas pump, that is, a charger is pulled out from the charging transmitter and magnetically attached to a certain position on the electric bicycle. The disadvantages of this method are quite obvious: 1) The electric bicycle needs to be modified to add a wireless charging receiving device. However, the present invention does not require modification of the electric bicycle. 2) Different electric bicycle battery models vary greatly. If a single lead is used, it will bring great safety risks. However, the present invention does not have this risk.

[0007] The present invention is based on safe charging, provides convenient charging, and takes into account requirements such as precise positioning, providing a complete solution. This will undoubtedly bring huge benefits to the electric bicycle industry. Summary of the Invention

[0008] 1. Technical problems to be solved: How to wirelessly charge an electric bicycle easily and safely.

[0009] 2. Technical solution: To solve the above problems, the present invention provides a magnetic wireless charging device for electric bicycles, including a magnetic wireless charging receiving end module and a magnetic wireless charging transmitting end module. The magnetic wireless charging receiving end module is connected to the electric bicycle driving battery through the external charging port of the electric bicycle. The electric bicycle driving battery is arranged under the electric bicycle seat. The magnetic wireless charging transmitting end module is arranged outside the electric bicycle through a support frame. The magnetic wireless charging transmitting end module and the magnetic wireless charging receiving end module are connected by magnetic attraction to charge the electric bicycle driving battery.

[0010] The magnetic wireless charging receiving terminal module has a wireless charging receiving terminal with a magnetic function, including a coil part and a circuit part, which can be combined together or separated and connected via a charging cable.

[0011] The magnetic wireless charging transmitter module has a wireless charging transmitter with a magnetic function. The transmitter includes a coil part and a circuit part. These two parts can be combined together or separated and connected via a charging cable.

[0012] The present invention also provides a charging method for a magnetic wireless charging device for an electric bicycle, comprising the following steps: Step 1: The system starts working.

[0013] Step 2: Enter self-test.

[0014] Step 3: The system determines whether it is a new receiving end.

[0015] Step 4: The system obtains the battery information corresponding to the new receiving end.

[0016] Step 5: The system enters the wireless charging stage.

[0017] Step 6: Determine the battery type.

[0018] Step 7: During normal charging, it is necessary to determine whether the temperature changes abnormally.

[0019] Step 8: During normal charging, determine whether the voltage has reached the charging cut-off voltage.

[0020] Step 9: Inform the user.

[0021] In step 4, the battery information includes the battery type, the battery rated charging voltage, and the charging current.

[0022] In step 4, when obtaining the battery information corresponding to the new receiving end, the system will automatically determine whether the information is complete: if not, continue to supplement; if it is complete, the system will save the information to the system. In the subsequent charging process, the system will automatically recognize it without having to scan a QR code to bind the user each time.

[0023] In step 6, the specific method is: when the system enters the charging stage, it first charges with a lower current, obtains the voltage change curve under the low current charging, and then determines the battery type based on the big data.

[0024] The judgment method is: the system compares the judgment with the battery type stored in the system, specifically compares it with the voltage curve under low current conditions corresponding to different types of batteries stored in the system, and compares it with the battery types stored in the system to see whether they are consistent. Different types of batteries adopt different charging strategies. If the two are inconsistent, the system pushes information and asks the user to confirm whether the input battery information is correct; if the battery type is judged to be consistent, the system proceeds to the normal charging stage.

[0025] In step 7, the specific method is: if the temperature is abnormal, the system reduces the charging power: and records the number of times; compares the number with the maximum number preset by the system. If the number exceeds the set number, the system determines that there is an abnormality in the charging process, and forces the charging to stop and alarm.

[0026] In step 8, specifically: when the charging cut-off voltage is reached, the battery is considered fully charged; if the charging cut-off voltage is not reached, but the user-preset charging time is reached, charging is completed.

[0027] In step 8, if the charging cut-off voltage is not reached but the charging time preset by the user is reached, the charging is completed.

[0028] 3.Beneficial effects: This invention provides a wireless charging device and method for electric bicycles with a magnetic suction function. This can fundamentally improve the charging safety of electric bicycles, eliminating safety incidents caused by charger-battery mismatches or poor charger contact.

[0029] The innovation of the present invention is: 1Magnetic wireless charger based on the external charging port of electric bicycle.

[0030] 2. Autonomous identification algorithm, eliminating the need to scan the QR code every time, the charger can autonomously identify vehicle information and other information.

[0031] 3. Autonomous charging control algorithm, including determining battery type based on low current, and then charging with constant voltage, constant current, trickle current or constant power to meet different charging scenarios.

[0032] Furthermore, in practical use, this method not only addresses charging safety issues but also automatically monitors the entire charging process, including temperature. Dozens of charging stations can be wirelessly connected to a wireless router, with data transmitted to the cloud via the cellular network. This allows operators and individual users to obtain real-time information on vehicle parking and status at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention.

[0034] Figure 2 It is a schematic diagram of the charging method of the present invention.

[0035] Explanation of the accompanying symbols: 1. Electric bicycle; 2. Electric bicycle seat; 3. Electric bicycle drive battery; 4. Charging cable; 5. Magnetic wireless charging receiver module; 6. Magnetic wireless charging transmitter module; 7. Support frame; 8. External charging port of the electric bicycle. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, it includes a magnetic wireless charging receiving end module 5 and a magnetic wireless charging transmitting end module 6. The magnetic wireless charging receiving end module 5 is connected to the electric bicycle driving battery 3 through the electric bicycle external charging port 8. The electric bicycle driving battery 3 is arranged under the electric bicycle seat 2. The magnetic wireless charging transmitting end module 6 is arranged outside the electric bicycle 1 through the support frame 7. The magnetic wireless charging transmitting end module 6 and the magnetic wireless charging receiving end module 5 are connected by magnetic attraction to charge the electric bicycle driving battery 3.

[0038] The magnetic wireless charging receiver module 5 is a wireless charging receiver with magnetic attraction. This receiver generally consists of a coil and a circuit. These two components can be combined or separated and connected via a charging cable. There is no difference in principle or function between the two. For ease of discussion, the present invention will be described as combining them together.

[0039] Magnetic wireless charging transmitter module 6. Similarly, this is a wireless charging transmitter with magnetic attraction. This transmitter generally consists of a coil and a circuit. These two components can be combined or separated, connected via a charging cable. There is no difference in principle or function between the two. For ease of discussion, this invention will be described as combining them together.

[0040] The support frame 7 is used to fix the magnetic wireless charging transmitter.

[0041] The electric bicycle has an external charging port 8, which is standard on electric bicycles and is typically located below the seat. The present invention utilizes this charging port. Therefore, in terms of usage, it is no different from a common charger, except that a magnetic charger without metal contacts replaces the physical connection.

[0042] like Figure 2 As shown, the present invention also provides a charging method for an electric bicycle magnetic wireless charging device, comprising the following steps: Step 1: Power on the magnetic wireless charging transmitter module 6, and the magnetic wireless charging receiver 5 is magnetically attracted to the transmitter. The system starts working.

[0043] Step 2: Enter self-test.

[0044] Step 3: The system determines whether it is a new receiving end. If it is a new receiving end (such as a new user), proceed to the next step.

[0045] Step 4: The system obtains the battery information corresponding to the new receiving end.

[0046] The system requires information about the battery corresponding to the new receiving end, such as battery type, rated charging voltage, and charging current. This information is presented as options. Immediately before submitting this information to the system, the system automatically determines whether it is complete. If not, it continues to supplement it; if so, it saves the information. During subsequent charging, the system will automatically recognize the user (not the battery) without having to scan a QR code each time to bind the user. The present invention prioritizes battery charging safety.

[0047] Step 5: The system enters the wireless charging stage.

[0048] Step 6: Determine the battery type.

[0049] In one embodiment, charging is first performed at a relatively low current (e.g., 2A). The voltage curve obtained under this low current charging is compared with the voltage curves corresponding to the low current conditions of different types of batteries stored in the system. The battery type is then determined based on the big data.

[0050] The system compares this determination with the battery type already stored in the system to see if they match (label 8 in Table 2). This is primarily for situations where the user has replaced the battery (e.g., replacing an existing ternary lithium battery with a cheaper lead-acid battery). As mentioned above, different battery types require different charging strategies, otherwise there will be safety risks. If the two do not match, the system pushes a message asking the user to confirm whether the battery information they entered is correct (i.e., whether the battery has been replaced). At this point, the information entry process, similar to that for first-time use, is repeated.

[0051] If the battery type is determined to be consistent, the system proceeds to the normal charging stage.

[0052] Step 7: During normal charging, you need to determine whether there are any abnormal temperature changes.

[0053] The system is in the normal charging stage, when the current is relatively large (such as 3.5A or higher). During the normal charging process, it is necessary to determine whether there are any abnormal temperature changes.

[0054] In one embodiment, the specific method for determining whether there is an abnormal temperature change is as follows: If the temperature is abnormal, such as rising by more than 20°C above normal, the system reduces the charging power and records the number of times. This number is then compared with a preset maximum number of times, such as 3. If the preset number of times is exceeded, the system determines that the charging process is abnormal, forcibly stops charging, and issues an alarm.

[0055] Step 8: During normal charging, determine whether the voltage has reached the charging cut-off voltage.

[0056] If the voltage reaches the charge cut-off voltage during normal charging, the battery is considered fully charged. If the charge cut-off voltage is not reached, but the user-set charging time is reached, charging is also considered complete.

[0057] Step 9: Inform the user.

[0058] The entire charging process ensures safety. It can not only autonomously identify the battery, but also ensure charging safety by controlling the charging power, thus preventing fire and other accidents in a timely manner.

Claims

1. A magnetic wireless charging device for an electric bicycle, characterized by: The invention comprises a magnetic wireless charging receiving end module (5) and a magnetic wireless charging transmitting end module (6), wherein the magnetic wireless charging receiving end module (5) is connected to the electric bicycle driving battery (3) via an external charging port (8) of the electric bicycle, wherein the electric bicycle driving battery (3) is arranged under the electric bicycle seat (2), and the magnetic wireless charging transmitting end module (6) is arranged outside the electric bicycle (1) via a support frame (7). The magnetic wireless charging transmitting end module (6) and the magnetic wireless charging receiving end module (5) are connected by magnetic attraction to charge the electric bicycle driving battery (3).

2. The magnetic wireless charging device for electric bicycles according to claim 1, characterized in that: The magnetic wireless charging receiving end module (5) has a wireless charging receiving end with a magnetic attraction function, including a coil part and a circuit part, which are connected by a charging line (4); the magnetic wireless charging transmitter end module (6) has a wireless charging transmitting end with a magnetic attraction function, which includes a coil part and a circuit part, which are connected by a charging line (4).

3. A charging method for the magnetic wireless charging device for an electric bicycle as claimed in claim 1 or 2, comprising the following steps: Step 1: The system starts working; Step 2: Enter self-test; Step 3: The system determines whether it is a new receiving end. If it is a new receiving end, it proceeds to step 4; Step 4: The system obtains the battery information corresponding to the new receiving end; Step 5: The system enters the wireless charging stage. Step 6: Determine the battery type; Step 7: During normal charging, you need to determine whether the temperature changes abnormally; Step 8: During normal charging, determine whether the voltage has reached the charging cut-off voltage. Step 9: Inform the user.

4. The charging method according to claim 3, wherein: In step 4, the battery information includes the battery type, the battery rated charging voltage, and the charging current.

5. The charging method according to claim 3, wherein: In step 6, when obtaining the battery information corresponding to the new receiving end, the system will automatically determine whether the information is complete: if not, continue to supplement; if it is complete, the system will save the information to the system. In the subsequent charging process, the system will automatically recognize it without having to scan a QR code to bind the user each time.

6. The charging method according to claim 3, wherein: In step 6, the specific method is: when the system enters the charging stage, it first charges with a lower current, obtains the voltage change curve under the low current charging, and then determines the battery type based on the big data.

7. The charging method according to claim 6, wherein: The judgment method is: the system compares the judgment with the battery type stored in the system, specifically compares it with the voltage curve under low current conditions corresponding to different types of batteries stored in the system, and compares it with the battery types stored in the system to see whether they are consistent. Different types of batteries adopt different charging strategies. If the two are inconsistent, the system pushes information and asks the user to confirm whether the input battery information is correct; if the battery type is judged to be consistent, the system proceeds to the normal charging stage.

8. The charging method according to claim 3, wherein: In step 7, the specific method is: if the temperature is abnormal, the system reduces the charging power: and records the number of times; compares the number with the maximum number preset by the system. If the number exceeds the set number, the system determines that there is an abnormality in the charging process, and forces the charging to stop and alarm.

9. The charging method according to claim 3, wherein: In step 8, specifically: when the charging cut-off voltage is reached, the battery is considered fully charged; if the charging cut-off voltage is not reached, but the user-preset charging time is reached, charging is completed.

10. The charging method as described in claim 3, characterized in that: In step 8, if the charging cut-off voltage is not reached but the charging time preset by the user is reached, the charging is completed.

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