Mobile power supply cell information transmission method and device based on wireless charging coil

Abstract

The invention relates to a mobile power supply cell information transmission method and device based on a wireless charging coil, and relates to the technical field of wireless charging and battery management, and the method comprises the steps: determining a data transmission time period when a mobile power supply device transmits a wireless power signal; acquiring real-time parameters of a plurality of battery cells of the battery pack, and packaging the real-time parameters into a battery cell data packet in a preset format; and in the data transmission period, modulating the cell data packet by controlling the electrical parameters of the resonant circuit coupled with the transmitting coil, and generating and transmitting a modulated magnetic field signal carrying the cell data packet. And the terminal equipment with the coil obtains the modulation magnetic field signal induced by wireless charging coupling through the receiving coil, demodulates the cell data packet, extracts the real-time parameters of the cell in the cell data packet and visually displays the real-time parameters of the cell. According to the invention, on the premise of not adding extra communication hardware, the cost of reliable transmission and visualization of the battery cell state information to the user equipment can be reduced.

Description

Method and device for transmitting information about mobile power bank cells based on wireless charging coils Technical Field

[0001] This application relates to the fields of wireless charging technology and battery management technology, and in particular to a method and device for transmitting information about mobile power cell based on a wireless charging coil. Background Technology

[0002] With the increasing popularity of portable power banks, users' demand for their safety and status visualization is growing. China's new national standard for portable power banks requires them to display key parameters of the battery cells, such as voltage, current, temperature, state of charge, and health status of single / multiple cells. Displaying these parameters helps users understand the working status of the power bank in a timely manner, ensuring safe use. It also drives continuous improvement in the functionality and performance of portable power banks, transforming them not only into charging devices but also into intelligent accessories that provide detailed information, meeting the market's demand for high-quality, highly safe portable power banks.

[0003] Currently, the mainstream methods for displaying key battery cell parameters in power banks are Bluetooth / USB communication solutions and integrated display solutions. The Bluetooth / USB communication solution involves integrating a Bluetooth module or USB communication chip into the power bank, then displaying the data on a terminal device via a dedicated app. Current power bank data transmission methods utilize mature wireless or wired communication technologies, which can meet data transmission needs to a certain extent. The integrated display solution, on the other hand, integrates a TFT or OLED screen onto the power bank itself to directly display data, allowing users to view information without the need for additional devices.

[0004] However, these existing technologies have significant drawbacks. Bluetooth / USB communication solutions increase hardware costs, power consumption, and design complexity. Additional Bluetooth modules or USB communication chips increase material costs, consume more power, and require more wiring and space considerations in the design. Integrated display solutions significantly increase costs and power consumption, and also affect product size and aesthetics. Displays are expensive and occupy internal space in the power bank, leading to a larger product size and limiting its appearance. Furthermore, existing wireless charging standards are mainly designed for unidirectional power transmission and simple bidirectional control communication. Their communication load modulation methods and data packet formats do not support the active transmission of custom, non-charging control-related, and relatively large amounts of application-layer data from the transmitter to the receiver, thus failing to directly meet the power bank's need for active, periodic reporting of cell monitoring data. Summary of the Invention

[0005] The purpose of this application is to provide a method for transmitting information about the battery cell of a mobile power supply based on a wireless charging coil, which can reduce the cost of reliably transmitting and visualizing the battery cell status information to user devices without adding additional communication hardware.

[0006] In a first aspect, this application provides a method for transmitting battery cell information in a mobile power bank based on a wireless charging coil, employing the following technical solution: A method for transmitting battery cell information in a mobile power bank based on a wireless charging coil includes: when a mobile power bank device transmits a wireless power signal through a transmitting coil, it determines a data transmission period for transmitting battery cell data; the mobile power bank device acquires real-time parameters of multiple battery cells in a battery pack and encapsulates the real-time battery cell parameters into a battery cell data packet of a preset format; during the data transmission period, the mobile power bank device modulates the battery cell data packet by controlling the electrical parameters of a resonant circuit coupled to the transmitting coil, generating and transmitting a modulated magnetic field signal carrying the battery cell data packet; a terminal device with a coil acquires the modulated magnetic field signal sensed by the wireless charging coupling through a receiving coil and demodulates the battery cell data packet; the terminal device with a coil extracts the real-time battery cell parameters from the battery cell data packet and displays them visually.

[0007] By adopting the above technical solution, the real-time parameters of the mobile power cell can be transmitted by reusing the wireless charging coil during the wireless charging process. No additional communication hardware is required, which reduces product cost and design complexity. At the same time, the cell parameters can be visualized on the terminal device, making it convenient for users to monitor the cell status.

[0008] In a preferred embodiment, this application can be further configured as follows: when the mobile power device transmits a wireless power signal through a transmitting coil, the step of determining a data transmission period for transmitting battery cell data includes: during continuous wireless power transmission, the mobile power device uses the period during which the subcarrier and the power carrier are simultaneously transmitted to a terminal device with a coil as the data transmission period for transmitting battery cell data, wherein the battery cell data is modulated using a subcarrier with a frequency different from that of the power carrier.

[0009] By adopting the above technical solution, charging and data transmission are synchronized during continuous wireless power transmission by using the subcarrier and power carrier to transmit simultaneously. Since the subcarrier frequency is different from the power carrier frequency, mutual interference can be avoided. At the same time, there is no need to interrupt power transmission to transmit data, which ensures the continuity of the charging process and reduces the impact on charging efficiency.

[0010] In a preferred embodiment, this application can be further configured as follows: when the mobile power device transmits a wireless power signal through a transmitting coil, the step of determining the data transmission period for transmitting battery cell data includes: during continuous wireless power transmission, the mobile power device uses a silent time window formed by pausing power transmission according to a preset period as the data transmission period for transmitting battery cell data.

[0011] By adopting the above technical solution, power transmission is paused at preset intervals during continuous wireless power transmission to form a silent time window for transmitting cell data. This enables periodic data updates without interrupting long-term charging, and the intermittent communication method reduces the impact on charging efficiency while also meeting the requirements for timed data transmission.

[0012] In a preferred embodiment, this application may be further configured as follows: when the mobile power device transmits a wireless power signal through a transmitting coil, the step of determining the data transmission period for transmitting battery cell data includes: after establishing a wireless charging connection with a terminal device with a coil, the mobile power device will use a preset period before the start of power transmission as the data transmission period for transmitting battery cell data.

[0013] By adopting the above technical solution, data exchange is performed after the power bank establishes a connection with the terminal device with the coil and before the high-power charging officially begins. This allows for reliable transmission of battery cell data without affecting the normal charging process.

[0014] In a preferred embodiment, this application can be further configured as follows: the step of the mobile power device acquiring real-time parameters of multiple cells in the battery pack and encapsulating the real-time parameters of the cells into a cell data packet of a preset format includes: the mobile power device encoding the real-time parameters of the cells according to a custom protocol and adding a synchronization header, frame type, length, payload and CRC check code to generate a modulation control signal for changing the resonant circuit to achieve modulation of the transmission magnetic field, wherein the frame type is marked as cell data.

[0015] By adopting the above technical solution, the mobile power supply device can encode the real-time parameters of the battery cell according to a custom protocol and add relevant fields to generate a modulation control signal, ensuring that the battery cell data packet can be accurately modulated and transmitted, which is convenient for terminal devices with coils to receive and parse. At the same time, the frame type is marked as battery cell data, enabling the terminal device to quickly identify the content of the data packet, realize reliable transmission and display of battery cell information, reduce hardware costs and power consumption, and meet the requirements of the new national standard for battery cell information display.

[0016] In a preferred embodiment, this application can be further configured as follows: the mobile power device, during the data transmission period, modulates the battery cell data packet by controlling the electrical parameters of the resonant circuit coupled to the transmitting coil, generating and transmitting a modulated magnetic field signal carrying the battery cell data packet. This includes: the mobile power device using amplitude shift keying (APS) modulation to modulate the amplitude of the transmitting magnetic field by changing the equivalent impedance of the resonant circuit, thereby generating a modulated magnetic field signal; and / or, the mobile power device using frequency shift keying (FSK) modulation to modulate the frequency of the transmitting magnetic field by changing the resonant frequency of the resonant circuit, thereby generating a modulated magnetic field signal.

[0017] By adopting the above technical solutions, mobile power devices can use amplitude keying modulation (AMT) to modulate the amplitude of the transmitting magnetic field by changing the equivalent impedance of the resonant circuit, or frequency shift keying (FPS) to modulate the frequency of the transmitting magnetic field by changing the resonant frequency of the resonant circuit. This generates and transmits a modulated magnetic field signal carrying battery cell data packets, enabling reliable transmission of battery cell data without the need for additional communication hardware, thus reducing costs and design complexity. Furthermore, the use of short-range electromagnetic coupling communication improves anti-interference capabilities and ensures stable communication.

[0018] In a preferred embodiment, this application can be further configured as follows: the step of the terminal device with a coil acquiring the modulated magnetic field signal sensed by wireless charging coupling through the receiving coil and demodulating the battery cell data packet includes: the terminal device with a coil using an envelope detector to demodulate the modulated magnetic field signal modulated by demodulation amplitude keying, using a frequency-to-voltage converter to demodulate the modulated magnetic field signal modulated by frequency shift keying, extracting the baseband modulation signal carrying the battery cell data packet, and converting it into a digital signal.

[0019] By adopting the above technical solutions, the terminal device can demodulate the modulated magnetic field signals generated by amplitude shift keying (APS) and frequency shift keying (FSK) of the mobile power device using an envelope detector and a frequency-to-voltage converter, respectively. This allows the baseband modulation signal carrying the battery cell data packet to be extracted and converted into a digital signal, laying the foundation for subsequent analysis of the battery cell's real-time parameters and enabling accurate demodulation of battery cell data packets under different modulation methods.

[0020] In a preferred embodiment, this application can be further configured as follows: the step of the terminal device with coil extracting the real-time battery parameters from the battery data packet and displaying them visually includes: the terminal device with coil identifying the data frame synchronization header in the battery data packet, parsing the data packet according to a custom protocol corresponding to the power bank device, and restoring the real-time battery parameters in the battery data packet; the terminal device with coil visually displaying the parsed real-time battery parameters.

[0021] By adopting the above technical solution, the terminal device can accurately identify and parse the battery cell data packet, restore the real-time parameters of the battery cell, and display them visually, so that users can intuitively obtain detailed information about the power bank battery cell and improve the user's visibility of the power bank status.

[0022] Secondly, this application provides a mobile power supply device, employing the following technical solution: A mobile power supply device includes: a battery pack and a battery management unit, wherein the battery management unit is electrically connected to the battery pack and is used to collect real-time parameters of the cells in the battery pack; a microcontroller unit, communicatively connected to the battery management unit, to acquire all real-time parameters of the cells, wherein the microcontroller unit includes a cell data encoding and modulation module, which encodes the real-time parameters of the cells according to a custom protocol and generates a modulation control signal; a wireless power transmission circuit for generating high-frequency alternating current; a transmitting coil, connected to the wireless power transmission circuit, for transmitting an alternating magnetic field; and an active modulation switch circuit, connected between the cell data encoding and modulation module of the microcontroller unit and the resonant circuit of the wireless power transmission circuit, for responding to the modulation control signal to change the equivalent impedance or resonant frequency of the resonant circuit, thereby modulating the magnetic field generated by the transmitting coil to carry data containing the real-time parameters of the cells.

[0023] Thirdly, this application provides a terminal device with a coil, employing the following technical solution: A terminal device with a coil includes: a receiving coil for coupling the magnetic field generated by the transmitting coil of a mobile power supply to induce alternating current, and the receiving coil also serves as a receiving antenna for battery cell data; a wireless power receiving circuit electrically connected to the receiving coil for converting the induced alternating current into direct current to charge the battery of the terminal device with the coil; a signal demodulation circuit communicatively connected to the receiving coil for extracting the baseband modulation signal carrying battery cell data from the received modulation magnetic field signal and converting it into a digital signal, wherein the signal demodulation circuit includes at least one of an envelope detector and a frequency-to-voltage converter; an application processor communicatively connected to the signal demodulation circuit for receiving the digital signal from the signal demodulation circuit, wherein the application processor includes a battery cell data demodulation and parsing module for identifying the data frame synchronization header and parsing the data packet according to a custom protocol corresponding to the mobile power supply device to restore the real-time battery cell parameters in the battery cell data packet; and a display screen connected to the application processor for displaying the parsed real-time battery cell parameters.

[0024] In summary, this application has the following beneficial technical effects: 1. By reusing the wireless charging coil and circuit, this application avoids the additional integration of Bluetooth modules, USB communication chips, or displays, reducing hardware costs, power consumption, and design complexity, and solving the problem of increased cost and complexity in existing solutions; 2. This application actively transmits cell information through a mobile power bank, and the terminal device with the coil automatically receives and displays the information visually. Users do not need to perform any extra operations; they can obtain information simply by placing the terminal device, thus meeting the user's need for status visualization; 3. This application modulates the cell data packets by controlling the electrical parameters of the resonant circuit, utilizing short-range electromagnetic coupling communication, which has strong anti-interference capabilities and can reliably transmit data. The method of modulating the transmission and demodulation magnetic field signals ensures reliable transmission of cell data. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the communication method between a mobile power supply device and a terminal device with a coil, according to one embodiment of this application.

[0026] Figure 2 is a flowchart of a mobile power cell information transmission method based on a wireless charging coil in one embodiment of this application.

[0027] Figure 3 is a flowchart of a sub-step of step S1 in one embodiment of this application.

[0028] Figure 4 is a flowchart of the sub-step of step S1 in one embodiment of this application.

[0029] Figure 5 is a flowchart of the sub-steps of step S1 in one embodiment of this application.

[0030] Figure 6 is a flowchart of the sub-steps of step S2 in one embodiment of this application.

[0031] Figure 7 is a flowchart of the sub-step of step S3 in one embodiment of this application.

[0032] Figure 8 is a flowchart of the sub-step of step S4 in one embodiment of this application.

[0033] Figure 9 is a flowchart of the sub-step of step S5 in one embodiment of this application.

[0034] Reference numerals: 1. Battery pack; 2. Battery management unit; 3. Microcontroller unit; 4. Wireless power transmission circuit; 5. Transmitting coil; 6. Active modulation switching circuit; 7. Receiving coil; 8. Wireless power receiving circuit; 9. Signal demodulation circuit; 10. Application processor; 11. Display screen. Detailed Implementation

[0035] The present application will be further described in detail below with reference to Figures 1-9.

[0036] It should be noted that, in the embodiments of this invention, the data related to object information, when applied to specific products or technologies, requires the permission or consent of the object. Furthermore, the collection, use, and processing of this data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. In other words, if the embodiments of this invention involve data related to an object, it must be obtained with the object's authorization and consent, the authorization and consent of relevant departments, and in accordance with the relevant laws, regulations, and standards of the country and region. If the embodiments involve personal information, the acquisition of all personal information requires the individual's consent. If sensitive information is involved, the separate consent of the information subject is required. The embodiments also need to be implemented with the object's authorization and consent.

[0037] Referring to Figures 1 and 2, a method for transmitting information about battery cells in a mobile power bank based on a wireless charging coil specifically includes: S1. When the mobile power bank device transmits a wireless power signal through the transmitting coil 5, it determines the data transmission period for transmitting battery cell data.

[0038] Specifically, by rationally planning dedicated data transmission periods during wireless power transmission, the need for additional independent communication channels is avoided. This allows battery cell information to be sent without interrupting the overall charging function, thus providing a clear time window for subsequent modulation and transmission and effectively utilizing existing wireless charging timing resources.

[0039] S2. The mobile power device acquires the real-time parameters of multiple cells in battery pack 1 and encapsulates the real-time parameters of the cells into a cell data packet of a preset format.

[0040] Specifically, the scattered cell status information is structured and integrated into a unified data packet format to facilitate subsequent modulation and parsing, ensuring information integrity and consistency. At the same time, it supports the efficient organization of multiple cell parameters, laying a data foundation for terminal devices with coils to accurately restore the cell status.

[0041] S3. During the data transmission period, the mobile power device modulates the battery cell data packet by controlling the electrical parameters of the resonant circuit coupled with the transmitting coil 5, and generates and transmits a modulated magnetic field signal carrying the battery cell data packet.

[0042] Specifically, by using the existing resonant circuit of the power bank as the modulation execution unit, the magnetic field loading of the cell data is achieved by actively adjusting the electrical parameters of the resonant circuit. Information embedding can be completed without additional radio frequency or communication modules, thereby reducing hardware costs while maintaining system integration.

[0043] S4. The terminal device with the coil obtains the modulated magnetic field signal sensed by the wireless charging coupling through the receiving coil 7, and demodulates the battery cell data packet.

[0044] Specifically, by reusing the induction coil and existing signal processing path in the wireless charging receiver link to complete the acquisition and demodulation of the modulated signal, it is possible to eliminate the need to introduce a dedicated receiving circuit. This allows the battery cell data recovery process and the charging function to share hardware resources, improving the system's economy and compatibility.

[0045] S5. The terminal device with the coil extracts the real-time parameters of the battery cells from the battery cell data packet and displays them visually.

[0046] Specifically, the demodulated cell parameters are presented in a user-readable format on the terminal device interface, allowing users to monitor the internal status of the power bank in real time without relying on a physical display screen 11 or third-party accessories. This enhances product safety and transparency, while also meeting the mandatory requirements of relevant regulations for the visualization of cell information.

[0047] Referring to Figures 1 and 3, further, in one embodiment, step S1 is refined into the following sub-steps: S10. During the continuous wireless power transmission process, the mobile power device transmits the subcarrier and the power carrier simultaneously to the terminal device with the coil as the data transmission period for transmitting battery cell data, wherein the battery cell data is modulated using a subcarrier with a frequency different from that of the power carrier.

[0048] Specifically, while continuously outputting a power carrier signal for charging terminal devices through transmitting coil 5, the power bank generates a subcarrier signal (e.g., 2.4MHz) with a frequency different from the power carrier frequency (e.g., 110-205kHz). Battery cell data packets are modulated onto this subcarrier. Subsequently, the modulated subcarrier signal and the unmodulated power carrier signal are superimposed in the circuit to form a composite electromagnetic signal, which is then synchronously transmitted through the same transmitting coil 5. During transmission, the entire power transmission process does not require interruption, and the data transmission period is logically defined as the continuous period during which power and data signals coexist.

[0049] In summary, frequency division multiplexing (FDM) technology enables parallel power transmission and data communication in the frequency domain. Because the subcarrier frequency and power carrier frequency are different, they can be effectively separated in the terminal device, thus avoiding mutual interference between signals and ensuring that charging efficiency is largely unaffected. Simultaneously, data transmission does not require interruption of power transmission, reducing potential charging delays or efficiency losses caused by periodic power pauses, ensuring the continuity of the charging process and a seamless user experience.

[0050] Furthermore, referring to Figures 1 and 4, in one embodiment, step S1 is further refined into the following sub-steps: S11. During continuous wireless power transmission, the mobile power device uses the silent time window formed by pausing power transmission according to a preset period as the data transmission period for transmitting battery cell data.

[0051] Specifically, during continuous wireless power transmission via the transmitting coil 5, the power carrier output is briefly interrupted according to a preset time period (e.g., 5 seconds), thus forming a very short silent time window (e.g., 1-10 milliseconds) without power transmission. This silent time window is specifically used for the transmission of battery cell data. Normal power transmission is immediately resumed after the window ends, and data communication periods are interspersed periodically during the charging process.

[0052] In summary, by employing a time-division multiplexing strategy, charging and communication are separated in the time dimension. Since data transmission occurs only within a very short silent window, its impact on the continuity of the overall charging process is negligible. This allows for the periodic reporting of battery cell status information while ensuring that users are unaware of any charging interruption. This intermittent communication achieves the ability to update data periodically at a lower cost in charging efficiency, meeting users' needs for continuous and stable monitoring of battery cell status.

[0053] Furthermore, referring to Figures 1 and 5, in one embodiment, step S1 is further refined into the following sub-steps: S12. After the mobile power device establishes a wireless charging connection with the terminal device with the coil, it will use a preset period before the start of power transmission as the data transmission period for transmitting battery cell data.

[0054] Specifically, after the power bank device completes the initial wireless charging protocol handshake and connection establishment with the terminal device with the coil, it does not immediately enter the full-power energy transfer phase. Instead, it first activates a pre-set preparation period to create an interference-free, independent communication window. During the preparation period, the power bank device will pause or maintain a low power output level and transmit the packaged battery cell data packet completely to the terminal device through the transmitting coil 5. After the data transmission is confirmed, it switches to normal charging power for energy transfer. This directly avoids the overlap and mutual interference between data transmission and energy transfer in time, ensuring the integrity and high reliability of the initial data report. It provides users with an experience where they can check the power status immediately after connection, and this is achieved entirely based on the existing connection establishment process without the need for any additional communication timing negotiation mechanisms.

[0055] Furthermore, referring to Figures 1 and 6, in one embodiment, step S2 is further refined into the following sub-steps: S20. The mobile power device encodes the real-time parameters of the battery cell according to a custom protocol, and adds a synchronization header, frame type, length, payload and CRC check code to generate a modulation control signal for changing the resonant circuit to achieve modulation of the transmission magnetic field, wherein the frame type is marked as battery cell data.

[0056] Specifically, the microcontroller unit 3 of the power bank device collects real-time parameters such as voltage and temperature of multiple battery cells and organizes and encodes them according to a preset custom communication protocol. The encoding process includes adding a fixed synchronization header for bit synchronization at the beginning of the data sequence, a frame type field to identify the purpose of this data packet, a field to indicate the length of subsequent valid data, and a payload containing all core data of the battery cell parameters. To ensure transmission reliability, a cyclic redundancy check (CRC) code is calculated and appended to the end of the data sequence, ultimately forming a complete and standardized binary data frame. The generated data frame will be further converted into modulation control signals used to control the operation of subsequent modulation circuits.

[0057] By defining a custom protocol frame format specifically optimized for cell status reporting, the magnetic field channel originally used for wireless charging can stably transmit structured battery management data. The added synchronization header and length field ensure that the receiver can correctly delimit and parse the frames, the dedicated frame type identifier avoids confusion with other possible data packets, and the CRC check mechanism effectively ensures data integrity during transmission. This encapsulation method makes full use of limited communication bandwidth and is a key software foundation for reusing wireless charging hardware to achieve reliable data communication.

[0058] Furthermore, referring to Figures 1 and 7, in one embodiment, step S3 is further refined into the following sub-steps: S30. The mobile power device adopts amplitude keying modulation to modulate the amplitude of the transmitting magnetic field by changing the equivalent impedance of the resonant circuit, thereby generating a modulated magnetic field signal.

[0059] Specifically, when the mobile power supply device uses amplitude shift keying (APS) modulation, the modulation control signal output by the microcontroller drives a switching element, which is connected in parallel with the resonant circuit in the wireless power transmission circuit 4. By controlling the switching element's on and off states, the equivalent parallel impedance of the resonant circuit can be quickly changed. Specifically, when the switch is on, the circuit impedance decreases, resulting in a decrease in the current amplitude flowing through the transmitting coil 5; when the switch is off, the circuit impedance recovers, and the current amplitude increases. This operation, which controls the current amplitude based on the "0" and "1" values ​​encoded in the battery cell data packet, achieves modulation of the transmitting magnetic field amplitude.

[0060] In summary, by adding only one controlled switching element to change the impedance of the resonant circuit, the digital signal can be converted into a change in the magnetic field amplitude. This requires minimal modification to the original wireless power transmission main circuit, is low in cost, and the resulting amplitude change can be reliably demodulated by the mature envelope detection technology of the terminal equipment. This provides a practical and effective technical path for achieving low-cost data loading at the transmitting end.

[0061] S31. and / or, the mobile power supply device uses frequency shift keying modulation to modulate the frequency of the transmitting magnetic field by changing the resonant frequency of the resonant circuit, thereby generating a modulated magnetic field signal.

[0062] Specifically, when the mobile power supply device uses frequency shift keying (FSK) modulation, the modulation control signal output by the microcontroller drives a switching circuit. This circuit can change the parameters of the capacitors or inductors connected to the wireless power transmission resonant circuit. By switching the resonant circuit to different capacitor or inductor configurations during different data bit periods, the circuit can have two or more different resonant frequencies. The frequency of the current in the transmitting coil 5 will jump between multiple preset frequencies according to the encoding of the battery cell data packet, thereby achieving modulation of the transmitting magnetic field frequency.

[0063] By modulating the frequency of the magnetic field rather than its amplitude to carry information, the communication process becomes less sensitive to amplitude attenuation along the transmission path, potentially providing better anti-interference performance and offering a feasible technical option for pursuing higher communication reliability in specific application scenarios.

[0064] Furthermore, referring to Figures 1 and 8, in one embodiment, step S4 is further refined into the following sub-steps: S40. The terminal device with coil uses an envelope detector to demodulate the modulation magnetic field signal modulated by demodulation amplitude keying, uses a frequency-to-voltage converter to demodulate the modulation magnetic field signal modulated by frequency shift keying, extracts the baseband modulation signal carrying the battery cell data packet, and converts it into a digital signal.

[0065] Specifically, the terminal device with the coil selects the appropriate demodulation circuit for processing based on the type of the received modulated magnetic field signal. When the signal is amplitude-keyed, an envelope detector is used to detect and track the envelope changes of the amplitude of the sensed composite signal, converting these amplitude changes into corresponding voltage change waveforms. When the signal is frequency-shift keying (FSK) modulated, a frequency-to-voltage converter is used to detect the periodic jumps in the frequency of the sensed signal and convert different frequency values ​​into different DC voltage levels. Finally, the modulation information contained in the magnetic field is recovered as an analog voltage waveform representing the original baseband digital signal. This analog voltage waveform is then used by a comparator or analog-to-digital converter to determine or sample a digital bitstream signal.

[0066] In summary, by reusing the signal conditioning circuit in the wireless charging receiving path of a terminal device with a coil and integrating envelope detection or frequency discrimination functions, effective data separation and extraction of the composite signal transmitted from the multiplexed coil can be achieved without the need to add an independent RF receiving chip, ensuring the accuracy and reliability of information conversion.

[0067] Furthermore, referring to Figures 1 and 9, in one embodiment, step S5 is further refined into the following sub-steps: S50. The terminal device with the coil identifies the data frame synchronization header in the battery cell data packet, parses the data packet according to the custom protocol corresponding to the mobile power device, and restores the real-time battery cell parameters in the battery cell data packet.

[0068] Specifically, the application processor 10 of the terminal device scans the demodulated and recovered digital bitstream to find and locate the bit sequence that perfectly matches the preset synchronization header. After successfully locating the start of the frame, the processor parses the subsequent fields sequentially according to a custom communication protocol format agreed upon with the power bank device, including the device identifier, the number of battery cells, and the corresponding number of battery cell voltage and temperature data blocks, until all fields of the entire data packet have been read and verified. Through this process, the binary information encoded in the bitstream is accurately restored into real-time parameters with physical meaning, such as battery cell voltage and temperature values.

[0069] Through rigorous frame synchronization and protocol parsing, it is ensured that even in interference-prone transmission environments, the independent state parameters of each cell and the overall state parameters of battery pack 1 can be accurately extracted.

[0070] S51. The terminal device with coils displays the real-time parameters of the battery cells in a visual manner.

[0071] Specifically, the terminal device's application or system service will parse the obtained real-time battery cell parameters and call the graphical user interface for rendering and presentation. The display format includes, but is not limited to, directly displaying the total remaining battery percentage in numerical form in a specific area of ​​the screen, displaying the voltage values ​​of each battery cell side-by-side in a bar chart to intuitively reflect the balance, and displaying temperature information in curve or numerical form. This information will be integrated into user-accessible interfaces such as the lock screen, notification center, or dedicated application windows.

[0072] In summary, by fully utilizing the high-performance, high-resolution display screen 11 and powerful graphics processing capabilities of the terminal device itself, the battery cell status can be displayed in a rich and intuitive manner, making it convenient for users to view in real time.

[0073] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0074] This application also provides a mobile power device, which is applied to the mobile power cell information transmission method based on wireless charging coil in the embodiments.

[0075] Referring to Figure 1, a mobile power device includes: a battery pack 1 and a battery management unit 2. The battery management unit 2 is electrically connected to the battery pack 1 and is used to collect real-time parameters of the cells in the battery pack 1.

[0076] The microcontroller unit 3 is communicatively connected to the battery management unit 2 to obtain all real-time parameters of the battery cells. The microcontroller unit 3 includes a battery cell data encoding and modulation module, which encodes the real-time parameters of the battery cells according to a custom protocol and generates modulation control signals.

[0077] Wireless power transmission circuit 4 is used to generate high-frequency alternating current.

[0078] The transmitting coil 5 is connected to the wireless power transmitting circuit 4 and is used to transmit an alternating magnetic field.

[0079] The active modulation switching circuit 6 is connected between the cell data encoding and modulation module of the microcontroller unit 3 and the resonant circuit of the wireless power transmission circuit 4. It is used to change the equivalent impedance or resonant frequency of the resonant circuit in response to the modulation control signal, thereby modulating the magnetic field generated by the transmitting coil 5 to carry data containing real-time cell parameters.

[0080] The battery pack 1 consists of multiple cells connected in series or parallel. The battery management unit 2 collects the voltage and temperature of each cell, as well as the total current and voltage of the battery pack 1, in real time, and calculates the State of Charge (SOC) and State of Harshness (SOH). The microcontroller unit 3 communicates with the battery management unit 2 to obtain parameters. The cell data encoding and modulation module of the microcontroller unit 3 encodes the parameters according to a custom protocol and generates modulation control signals. The wireless power transmission circuit 4 includes a DC-AC inverter and a resonant matching network to generate high-frequency alternating current. The transmitting coil 5 is connected to the wireless power transmission circuit 4 and also serves as a data transmission antenna. The active modulation switching circuit 6 receives the modulation control signals and changes the impedance or frequency of the resonant circuit by switching MOSFETs or a small inductor to achieve ASK / FSK modulation, loading the cell data into the magnetic field.

[0081] This application also provides a terminal device with a coil, which is applied to the mobile power cell information transmission method based on wireless charging coil in the embodiments.

[0082] Referring to Figure 1, a terminal device with a coil includes: a receiving coil 7, used to couple the magnetic field generated by the transmitting coil 5 of the mobile power supply to induce alternating current, and the receiving coil 7 also serves as a receiving antenna for battery data.

[0083] The wireless power receiving circuit 8, electrically connected to the receiving coil 7, is used to convert the induced alternating current into direct current to charge the battery of the terminal device with the coil.

[0084] The signal demodulation circuit 9 is communicatively connected to the receiving coil 7 and is used to extract the baseband modulation signal carrying the cell data from the received modulation magnetic field signal and convert it into a digital signal. The signal demodulation circuit 9 includes at least one of an envelope detector and a frequency-to-voltage converter.

[0085] Application processor 10 is communicatively connected to signal demodulation circuit 9 and is used to receive digital signals from signal demodulation circuit 9. Application processor 10 includes a cell data demodulation and parsing module, which is used to identify data frame synchronization headers and parse data packets according to a custom protocol corresponding to the mobile power device to restore the real-time parameters of the cell in the cell data packet.

[0086] The display screen 11 is connected to the application processor 10 and is used to display the real-time parameters of the battery cell.

[0087] The receiving coil 7 and a resonant capacitor are connected in parallel to form a resonant circuit at the receiving end, used to selectively couple the magnetic field of a specific frequency from the transmitting coil 5 of the mobile power supply. The wireless power receiving circuit 8 includes a full-bridge rectifier circuit composed of four diodes, followed by a filter capacitor and a voltage regulator circuit, used to convert the induced AC current into a stable DC current. The signal demodulation circuit 9 is electrically connected to the input of the receiving coil 7 or the rectifier bridge. In one embodiment, the included envelope detector is composed of a detector diode, a load resistor, and a filter capacitor, used to extract amplitude changes from the received signal; in another embodiment, the included frequency-to-voltage converter is a frequency discriminator or a phase-locked loop circuit, used to convert the frequency changes of the received signal into voltage changes; the finally demodulated analog voltage signal is converted into a digital signal by a voltage comparator or an analog-to-digital converter. The application processor 10 is connected to the output of the signal demodulation circuit 9 through a general-purpose input / output interface or a dedicated data interface. The internally running cell data demodulation and parsing module is implemented through software or firmware, responsible for bit synchronization, frame header identification, field extraction, and cyclic redundancy check of the input digital bit stream. The display screen 11 is connected to the application processor 10 via a display interface, and is used to receive the processed cell parameter data and render it into a graphical user interface for display.

[0088] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

Claims

1. A method for transmitting information about a mobile power bank cell based on a wireless charging coil, characterized in that, include: When the mobile power device transmits a wireless power signal through the transmitting coil (5), it determines the data transmission period for transmitting cell data; The mobile power device acquires real-time parameters of multiple cells in the battery pack (1) and encapsulates the real-time parameters of the cells into a cell data packet of a preset format. During the data transmission period, the mobile power device modulates the battery cell data packet by controlling the electrical parameters of the resonant circuit coupled to the transmitting coil (5), thereby generating and transmitting a modulated magnetic field signal carrying the battery cell data packet. The terminal device with a coil obtains the modulated magnetic field signal sensed by the wireless charging coupling through the receiving coil (7), and demodulates the battery cell data packet; the terminal device with a coil extracts the real-time battery cell parameters in the battery cell data packet and displays them visually.

2. The method according to claim 1, characterized in that, The step of determining the data transmission period for transmitting battery cell data when the mobile power device transmits a wireless power signal through the transmitting coil (5) includes: during the continuous wireless power transmission process, the mobile power device transmits the subcarrier and the power carrier to the terminal device with the coil at the same time as the data transmission period for transmitting battery cell data, wherein the battery cell data is modulated using a subcarrier with a frequency different from that of the power carrier.

3. The method according to claim 1, characterized in that, The step of determining the data transmission period for transmitting battery cell data when the mobile power device transmits a wireless power signal through the transmitting coil (5) includes: during the continuous wireless power transmission process, the mobile power device uses the silent time window formed by pausing power transmission according to a preset period as the data transmission period for transmitting battery cell data.

4. The method according to claim 1, characterized in that, The step of determining the data transmission period for transmitting battery cell data when the mobile power device transmits a wireless power signal through the transmitting coil (5) includes: after the mobile power device establishes a wireless charging connection with a terminal device with a coil, it will use a preset period before the start of power transmission as the data transmission period for transmitting battery cell data.

5. The method according to claim 1, characterized in that, The step of the mobile power device acquiring real-time parameters of multiple cells in the battery pack (1) and encapsulating the real-time parameters of the cells into a cell data packet of a preset format includes: the mobile power device encoding the real-time parameters of the cells according to a custom protocol and adding a synchronization header, frame type, length, payload and CRC check code to generate a modulation control signal for changing the resonant circuit to achieve modulation of the transmission magnetic field, wherein the frame type is marked as cell data.

6. The method according to claim 1, characterized in that, The mobile power device modulates the battery cell data packet by controlling the electrical parameters of the resonant circuit coupled to the transmitting coil (5) during the data transmission period, generating and transmitting a modulated magnetic field signal carrying the battery cell data packet. The steps include: the mobile power device uses amplitude shift keying modulation to modulate the amplitude of the transmitting magnetic field by changing the equivalent impedance of the resonant circuit to generate a modulated magnetic field signal; and / or, the mobile power device uses frequency shift keying modulation to modulate the frequency of the transmitting magnetic field by changing the resonant frequency of the resonant circuit to generate a modulated magnetic field signal.

7. The method according to claim 6, characterized in that, The step of the terminal device with coil acquiring the modulated magnetic field signal sensed by wireless charging coupling through the receiving coil (7) and demodulating the battery cell data packet includes: the terminal device with coil using an envelope detector to demodulate the modulated magnetic field signal modulated by demodulation amplitude keying, using a frequency-to-voltage converter to demodulate the modulated magnetic field signal modulated by frequency shift keying, extracting the baseband modulation signal carrying the battery cell data packet, and converting it into a digital signal.

8. The method according to claim 7, characterized in that, The step of the terminal device with coil extracting real-time battery parameters from the battery data packet and displaying them visually includes: the terminal device with coil identifying the data frame synchronization header in the battery data packet, parsing the data packet according to a custom protocol corresponding to the power bank device, and restoring the real-time battery parameters in the battery data packet; and the terminal device with coil visually displaying the parsed real-time battery parameters.

9. A portable power bank device, characterized in that, include: A battery pack (1) and a battery management unit (2), wherein the battery management unit (2) is electrically connected to the battery pack (1) and the battery management unit (2) is used to collect real-time parameters of the cells in the battery pack (1) in real time; a microcontroller unit (3), which is communicatively connected to the battery management unit (2) to obtain all real-time parameters of the cells, wherein the microcontroller unit (3) includes a cell data encoding and modulation module, which encodes the real-time parameters of the cells according to a custom protocol and generates a modulation control signal; a wireless power transmission circuit (4), which is used to generate high-frequency alternating current; a transmitting coil (5), which is connected to the wireless power transmission circuit (4) and is used to transmit an alternating magnetic field; an active modulation switch circuit (6), which is connected between the cell data encoding and modulation module of the microcontroller unit (3) and the resonant circuit of the wireless power transmission circuit (4), and is used to change the equivalent impedance or resonant frequency of the resonant circuit in response to the modulation control signal, thereby modulating the magnetic field generated by the transmitting coil (5) to carry data containing the real-time parameters of the cells.

10. A terminal device with a coil, characterized in that, include: A receiving coil (7) is used to couple the magnetic field generated by the transmitting coil (5) of the mobile power supply to induce alternating current. Simultaneously, the receiving coil (7) serves as a receiving antenna for the battery cell data. A wireless power receiving circuit (8) is electrically connected to the receiving coil (7) and is used to convert the induced alternating current into direct current to charge the battery of the terminal device with the coil. A signal demodulation circuit (9) is communicatively connected to the receiving coil (7) and is used to extract the baseband modulation signal carrying the battery cell data from the received modulated magnetic field signal and convert it into a digital signal. The signal demodulation circuit (9) includes an envelope detector. The device includes at least one of a detector and a frequency-to-voltage converter; an application processor (10), communicatively connected to the signal demodulation circuit (9), for receiving digital signals from the signal demodulation circuit (9), wherein the application processor (10) includes a cell data demodulation and parsing module, the cell data demodulation and parsing module being used to identify the data frame synchronization header and parse the data packet according to a custom protocol corresponding to the mobile power device, and restore the real-time cell parameters in the cell data packet; and a display screen (11), connected to the application processor (10), for displaying the parsed real-time cell parameters.

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