Wireless communication device and charging device

Abstract

The application provides a wireless communication device and a charging device. The wireless communication device comprises a shell, a battery arranged in the shell, a wireless transmission module and a magnetic shielding member. The battery comprises a metal packaging layer. The wireless transmission module comprises a coil module, which is located between the metal packaging layer and the shell. The magnetic shielding member is arranged between the coil module and the metal packaging layer, and covers at least the surface of the coil module facing the metal packaging layer. The magnetic shielding member constructs a magnetic flux guiding physical structure between the coil module and the metal packaging layer of the battery, restructures a magnetic flux path, and physically avoids the generation of eddy current on the metal packaging layer of the battery, so that the reliability of wireless communication can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and in particular to a wireless communication device and a charging device. Background Technology

[0002] Near Field Communication (NFC) technology, with its convenient tap-to-connect feature, is widely used in consumer electronics. However, integrating NFC functionality into highly compact electronic devices inevitably requires the NFC antenna to be positioned close to a metal layer. For example, in a power bank, the NFC antenna needs to be positioned close to the outer surface of the battery pack, which is often a metal encapsulation layer. According to Faraday's law of electromagnetic induction and Lenz's law, when the high-frequency alternating magnetic field radiated by the NFC antenna penetrates perpendicularly through the metal encapsulation layer, it induces strong, opposite-direction eddy currents in the metal conductor. The secondary magnetic field generated by eddy currents can severely cancel out the original radiation field of the NFC antenna, causing a sharp drop in the quality factor (Q value) of the NFC antenna system and a drastic reduction in radiation energy. This can easily lead to NFC read / write failures or a "communication blind zone" with a communication distance of almost zero. Taking a typical mobile power bank using pouch cells as an example, the aluminum layer in the aluminum-plastic film on the outer layer of the pouch cell is about 40 micrometers thick. At the NFC operating frequency of 13.56MHz, the skin depth of the aluminum layer is only about 22 micrometers. The attenuation of the NFC near-field magnetic field by the aluminum layer can reach 15-20 dB, making NFC communication almost impossible without a magnetic shielding sheet.

[0003] Therefore, ensuring the reliability of NFC communication within the highly compact space of electronic devices is a technical challenge that urgently needs to be addressed. Summary of the Invention

[0004] To address the existing technical problems, this application provides a wireless communication device and a charging device that can effectively improve the reliability of NFC communication.

[0005] In a first aspect, a wireless communication device is provided, including a housing, a battery disposed within the housing, a wireless transmission module, and a magnetic shielding component; The battery includes a metal encapsulation layer; The wireless transmission module includes a coil module, which is located between the metal encapsulation layer and the outer shell; The magnetic shielding component is disposed between the coil module and the metal encapsulation layer, and the magnetic shielding component at least covers the surface of the coil module facing the metal encapsulation layer.

[0006] The material of the magnetic shielding component is ferrite or nanocrystalline soft magnetic alloy.

[0007] Wherein, if the material of the magnetic shielding component is ferrite, the magnetic shielding component has a permeability greater than 100 Henry / meter and a resistivity greater than Made of ferrite from Ohm-Mie; If the material of the magnetic shielding component is a nanocrystalline soft magnetic alloy, the magnetic shielding component is made of a nanocrystalline soft magnetic alloy with a magnetic permeability greater than 100 Henry / meter.

[0008] Wherein, the size of the magnetic shielding component is greater than or equal to the size of the outermost coil of the coil module, and the projection of the outermost coil onto the metal encapsulation layer is located within the projection range of the magnetic shielding component onto the metal encapsulation layer; and / or, The thickness of the magnetic shielding component is 0.05 mm to 0.5 mm.

[0009] The size of the magnetic shielding component is not less than 1.1 times the size of the outermost coil of the coil module.

[0010] The outer casing also contains a main control circuit board, on which a controller is mounted; The wireless transmission module also includes an NFC chip located on the main control circuit board; Under normal operating conditions of the wireless communication device, the controller acquires the battery status parameters of the battery and stores the battery status parameters in the NFC chip; the battery status parameters include at least one of the following: voltage, current, temperature, and remaining capacity.

[0011] The portion of the outer casing corresponding to the coil module is the NFC sensing area; the NFC sensing area is used so that when an NFC reading device approaches, the NFC reading device reads the battery status parameters from the NFC chip.

[0012] Specifically, when the wireless communication device is powered off or in a low-power state, and the NFC reader is near the NFC sensing area, the NFC chip receives power based on the radio frequency field of the NFC reader to enable the NFC reader to read the battery status parameters from the NFC chip.

[0013] When the wireless communication device detects a power-off command or when the current battery level is lower than a preset threshold, the controller immediately obtains the latest battery status parameters of the battery and stores the latest battery status parameters in the NFC chip.

[0014] The main control circuit board is also equipped with a battery management system, which is used to monitor and obtain the battery status parameters of the battery; the controller obtains the battery status parameters from the battery management system according to a set period.

[0015] The controller acquires battery performance data according to a preset strategy and stores the battery performance data in the NFC chip. The preset strategy includes at least one of the following: acquiring at a set time interval, or acquiring when a preset event is detected; The battery performance data includes at least one of the following: battery health, cumulative cycle count, historical highest temperature, historical lowest temperature, and fault code.

[0016] In a second aspect, a charging device is provided, including the wireless communication device described in any embodiment of this application, wherein the battery is a battery pack and the metal encapsulation layer is an aluminum-plastic film, or the battery is a cylindrical cell and the metal encapsulation layer is a steel shell.

[0017] In the above embodiments, a magnetic shielding component is provided between the metal encapsulation layer of the battery and the coil module of the wireless transmission module within the wireless communication device. The magnetic shielding component at least covers the surface of the coil module facing the metal encapsulation layer. The magnetic shielding component provides a conduction path for the alternating magnetic flux generated by the coil module that is lower than the magnetic resistance of the surrounding medium, thereby confining the magnetic flux primarily within the magnetic shielding component. Therefore, the magnetic shielding component constructs a magnetic flux guiding physical architecture between the coil module and the metal encapsulation layer of the battery, reconstructing the magnetic flux path and physically preventing eddy currents from being generated on the metal encapsulation layer of the battery. This effectively improves the reliability of wireless communication. The wireless transmission module can be an NFC module, making it suitable for solving the reliability problem of NFC communication within the space of highly compact electronic devices.

[0018] The charging device provided in the above embodiments belongs to the same concept as the various wireless communication device embodiments, and thus has the same technical effect as the corresponding wireless communication device embodiments, which will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a wireless communication device in one embodiment.

[0020] Figure 2 This is a schematic diagram illustrating the data interaction between an NFC reader and a wireless communication device to read battery status parameters in one embodiment.

[0021] Figure 3 This is a comparison diagram of magnetic flux paths with and without magnetic shielding.

[0022] Figure 4 This is a schematic diagram illustrating the data flow of an NFC reader reading battery status parameters from a wireless communication device in one embodiment.

[0023] Explanation of icon numbers Wireless communication device 10, housing 11, battery 13, metal encapsulation layer 132, magnetic shielding component 14, wireless transmission module 15, coil module 151, NFC chip 153, controller 16, battery management system 17, NFC reading device 20. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the following description, the phrase "some embodiments" refers to a subset of all possible embodiments. It should be noted that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0027] In the following description, the terms "first, second, and third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, and third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0028] In the following description, when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intermediate element present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element, or there may also be an intermediate element present. Furthermore, the terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions are used only for illustrative purposes based on the reference orientations shown in the accompanying drawings and do not represent the only possible implementation.

[0029] Please see Figure 1 and Figure 2 A wireless communication device 10 provided in one embodiment of this application includes a housing 11, a battery 13 disposed within the housing 11, a wireless transmission module 15, and a magnetic shielding member 14. The battery 13 includes a metal encapsulation layer 132. The wireless transmission module 15 includes a coil module 151, which is located between the metal encapsulation layer 132 and the housing 11. The magnetic shielding member 14 is disposed between the coil module 151 and the metal encapsulation layer 132, and the magnetic shielding member 14 at least covers the surface of the coil module 151 facing the metal encapsulation layer 132.

[0030] Wireless communication device 10 refers to any electronic product that integrates wireless communication functions and is powered by its own battery 13. Wireless transmission module 15 refers to a functional unit that integrates and packages wireless communication functions. Depending on the degree of integration, the wireless control chip and induction coil in wireless transmission module 15 can be separate components or integrated as a whole. Taking wireless communication module 15 as an NFC module as an example, coil module 151 is the NFC antenna. The NFC chip 153 and the NFC antenna can be separate components or integrated as a whole. Coil module 151 is located close to the outer casing 11 to form a corresponding sensing area, facilitating proximity interconnection with NFC reading device 20. Magnetic shielding component 14 is located between coil module 151 and the metal encapsulation layer 132 on the outside of the battery pack.

[0031] The magnetic shielding component 14 at least covers the surface of the coil module 151 facing the metal encapsulation layer 132. This can mean that the magnetic shielding component 14 has the same shape and size as the coil module 151 and is perfectly aligned, thereby covering the surface of the coil module 151 facing the metal encapsulation layer 132. Alternatively, it can mean that the magnetic shielding component 14 has the same or different shape as the coil module 151, but its shape and size are designed to be sufficient to cover the surface of the coil module 151 facing the metal encapsulation layer 132.

[0032] It should be noted that the coil module 151 may include an induction coil portion and a portion electrically connecting the induction coil to the wireless control chip. In this case, the magnetic shielding member 14 may be configured to at least cover the coil region 150 in the coil module 151 where the induction coil is disposed. For example, when the coil module 151 is an NFC antenna, the NFC antenna includes a coil region 150 and a conductive portion located outside the coil region 150. A metal conductive layer may be disposed on the conductive portion, and the NFC antenna extends through the conductive portion to be electrically connected to the NFC chip. In this case, the magnetic shielding member 14 may at least cover the surface of the coil region 150 facing the metal encapsulation layer 132.

[0033] The wireless communication device 10 provided in the above embodiment provides a magnetic shielding member 14 between the metal encapsulation layer 132 of the battery 13 and the coil module 151. The magnetic shielding member 14 at least covers the surface of the coil module 151 facing the metal encapsulation layer 132. The magnetic shielding member 14 can provide a conduction path for the alternating magnetic flux generated by the coil module 151 that is lower than the magnetic resistance of the surrounding medium, thereby confining the magnetic flux mainly within the magnetic shielding member 14. Therefore, the magnetic shielding member 14 is equivalent to constructing a magnetic flux guiding physical architecture between the coil module 151 and the metal encapsulation layer 132 of the battery 13, reconstructing the magnetic flux path, thereby physically avoiding the generation of eddy currents in the metal encapsulation layer 132 of the battery 13, which can effectively improve the reliability of wireless communication.

[0034] Please see Figure 3 Taking a wireless communication device 10 as an example of a charging device with a highly compact internal space, in order to achieve high energy density, the coil module 151 is positioned close to the lithium-ion battery group 13 inside the charging device. Figure 3 (a) Without the magnetic shielding component 14, the high-frequency alternating magnetic field radiated by the coil module 151 penetrates perpendicularly through the metal encapsulation layer 132 outside the battery 13, thereby inducing eddy currents in the opposite direction on the metal conductor. These eddy currents generate a reverse magnetic field, opposite in direction to the alternating magnetic field generated by the coil module 151, weakening the effective magnetic field strength of the coil module 151, resulting in a drastic reduction in NFC communication distance or even failure to communicate. Secondly, electromagnetic energy is converted into heat energy lost due to eddy currents inside the metal encapsulation layer 132 of the battery 13, rather than being used for signal transmission, further reducing the effective communication distance. Figure 3 (b) When the magnetic shielding component 14 is provided, the magnetic shielding component 14 provides a conduction path for the alternating magnetic flux generated by the coil module 151 that is lower than the magnetic resistance of the surrounding medium (air), thereby confining the alternating magnetic flux inside the magnetic shielding component 14 and forming a horizontal conduction path inside the magnetic shielding component 14 along its own plane. This changes the direction of magnetic flux propagation to be approximately parallel to the surface of the metal encapsulation layer 132 outside the battery 13, physically avoiding the vertical penetration of magnetic flux through the metal outside the battery 13, thereby fundamentally suppressing the generation of eddy currents in the metal encapsulation layer 132.

[0035] The magnetic shielding element 14 allows the alternating magnetic flux generated by the coil module 151 to preferentially flow through the magnetic shielding element 14 itself, rather than through air or metal. Therefore, the material of the magnetic shielding element 14 is further preferably high permeability. The material of the magnetic shielding element 14 is as follows. In some embodiments, the magnetic permeability of the material is greater than a first preset value, specifically, the first preset value is 100 Henry / meter. In an optional specific example, the material of the magnetic shielding element 14 is ferrite or nanocrystalline soft magnetic alloy, and the magnetic shielding element 14 is made of ferrite or nanocrystalline soft magnetic alloy with a magnetic permeability greater than 100 Henry / meter. The magnetic shielding element 14 reconstructs the magnetic flux path, so that the alternating magnetic flux generated by the coil module 151 is confined within it and forms a horizontal conduction path to radiate outward. Preferably, soft magnetic ferrite is used as the ferrite, which allows for a significant reduction in the thickness of the magnetic shielding element 14. For example, the thickness of soft magnetic ferrite ranges from 0.05mm to 0.5mm, making it more suitable for use in power bank products and meeting the requirements of thin design.

[0036] In some embodiments, the material of the soft magnetic ferrite is preferably nickel-zinc ferrite (NiZn), which has a high resistivity (approximately 5 × 10⁻⁶). 4Its high ohm-cm and low magnetic loss characteristics make it perform exceptionally well in the high-frequency operating environments commonly used in power banks (such as 100 kHz to 300 MHz). This effectively reduces energy loss caused by eddy currents and hysteresis, thereby improving the overall conversion efficiency of wireless charging and extending the power bank's battery life.

[0037] When the material of the magnetic shielding component 14 is ferrite, in order to form a more reliable horizontal conduction path, the material of the magnetic shielding component 14 is further preferably high resistivity. The material. In some embodiments, the resistivity of the material of the magnetic shielding element 14 is greater than a second preset value, specifically, the second preset value is... Ohm-meter, that is, the magnetic shielding element 14 is made of a magnetic permeability greater than 100 Henry / meter and a resistivity greater than It is made of ferrite with an ohm-meter thickness. When the material of the magnetic shielding component 14 is a nanocrystalline soft magnetic alloy, the nanocrystalline soft magnetic alloy itself is a good conductor, and its resistivity value is not limited. That is to say, when the material of the magnetic shielding component 14 is a nanocrystalline soft magnetic alloy, although the bulk resistivity of the nanocrystalline soft magnetic alloy is low (approximately 115-120 micro-ohm-cm), it suppresses eddy currents through the following structural design: using ultra-thin strips (approximately 18-25 micrometers thick) for interlayer insulating lamination, and mechanically fragmenting the continuous strip into millimeter-sized discrete fragments, each fragment being electrically isolated by an adhesive layer, thus macroscopically equivalent to a high-resistivity material. Therefore, for nanocrystalline soft magnetic alloy materials, the focus should be on its effective permeability after fragmentation, rather than its bulk resistivity.

[0038] To meet the high compactness requirements of the internal space of the wireless communication device 10, the coil module 151 typically employs an on-board antenna. For example, it could be an on-board antenna with a coil etched onto a flexible printed circuit board (FPC), or an on-board antenna with a copper wire-wound coil mounted on the FPC. Correspondingly, the coil region 150 can refer only to the area on the FPC where the coil is etched or the copper wire-wound coil is mounted. Similarly, the magnetic shielding member 14 disposed between the coil module 151 and the metal encapsulation layer 132 of the battery 13 has a sheet-like structure. The magnetic shielding member 14 is a magnetic shielding sheet corresponding to the side of the coil module 151 facing the battery 13, and is made of high magnetic permeability. and high resistivity It is made of flexible magnetic material.

[0039] The magnetic shielding component 14 at least covers the surface of the coil module 151 facing the metal encapsulation layer 132. The coil region 150 can be determined based on the outermost coil of the etched coil and copper wire wound coil in the onboard antenna. The size of the magnetic shielding component 14 is greater than or equal to the size of the outermost coil of the coil module 151, and the projection of the outermost coil on the metal encapsulation layer 132 is within the projection range of the magnetic shielding component 14 on the metal encapsulation layer 132. The size of the magnetic shielding component 14 is not less than the projected area of ​​the outermost coil of the coil module 151, and it is used to isolate the magnetic flux path of the coil module 151 facing the metal encapsulation layer 132 of the battery 13.

[0040] In a specific example, the size of the magnetic shielding component 14 is not less than 1.1 times the size of the outermost coil of the coil module 151. Specifically, the size of the magnetic shielding component 14 is not less than 1.1 times the outer diameter of the outermost coil of the coil module, that is, the size of each side of the magnetic shielding component is approximately 5% larger than the size of the corresponding side of the outermost coil. Considering that the alternating magnetic flux generated by the coil module 151 usually diverges outward, the size of the magnetic shielding component 14 is set to be not less than 1.1 times the size of the outermost coil to prevent magnetic leakage at the edges of the coil module 151.

[0041] To ensure that the magnetic shielding component 14 reliably isolates the magnetic flux path of the coil module 151, in addition to designing the dimensions of the magnetic shielding component 14 to meet the specified ratio requirements of the coil region 150 of the coil module 151, the thickness of the magnetic shielding component 14 is further designed. Optionally, the thickness of the magnetic shielding component 14 is between 0.05 mm and 0.5 mm to balance the shielding effect on the coil module 151 with the requirement for a highly compact internal space of the wireless communication device 10.

[0042] In summary, the design of the size, thickness, and relative position of the magnetic shielding component 14 with the coil module 151 ensures the reliability of NFC communication in a highly compact metal environment. Testing has shown that, under high electromagnetic noise conditions with the battery 13 fully loaded and operating at high current, the magnetic shielding component 14, compared to a non-magnetic shielding solution, reduces the NFC false trigger rate to below 5% when using a wireless transmission module as an example. With the coil module 151 in close contact with the metal encapsulation layer 132 of the battery 13, the effective communication distance can exceed 20mm, thus supporting more types of NFC reading devices 20, such as mobile phones. By constructing a magnetic flux guiding physical architecture between the coil module 151 and the metal encapsulation layer 132 on the outside of the battery 13 using the magnetic shielding component 14, the magnetic flux path is reconstructed, suppressing the generation of eddy currents in the metal encapsulation layer 132 on the battery 13's surface. This improves NFC communication reliability and increases the success rate of NFC read / write operations on mobile phones with cases.

[0043] Optionally, the magnetic shielding element 14 is disposed between the coil module 151 and the metal encapsulation layer 132 of the battery 13 to isolate the magnetic flux of the coil module 151, and further detects the increase L in the coil inductance of the coil module 151 caused by the introduction of the magnetic shielding element 14. Based on the increase L in the coil inductance, the compensation capacitor value C is calculated according to the following formula: ; In the formula, f is the target operating frequency, 13.56MHz; This represents the inductance value of the coil module without the introduction of a magnetic shielding component. This represents the increase in inductance caused by the introduction of the magnetic shielding component. Specifically, the compensation capacitor value C is calculated based on the sum of the "coil inductance" and the "magnetic shielding component inductance".

[0044] In response to the increase in the equivalent inductance of the coil module 151 due to the introduction of the magnetic shielding element 14, the total capacitance value of the dynamic capacitance compensation network connected to the coil module 151 is adjusted according to the compensation capacitance value C, so that the resonant slope of the coil module 151 can be locked within the target operating frequency band. In an optional example, the target operating frequency band is the international standard NFC communication band, specifically 13.56MHz. z200kHz.

[0045] In some embodiments, a main control circuit board is further provided inside the housing 11, and a controller 16 is provided on the main control circuit board. The wireless transmission module 15 also includes a wireless control chip disposed on the main control circuit board. When the wireless transmission module 15 is an NFC module, the wireless control chip refers to the NFC chip 153. Under normal operating conditions of the wireless communication device 10, the controller 16 acquires the battery status parameters of the battery 13 and stores the battery status parameters in the NFC chip 153; the battery status parameters include at least one of the following: voltage, current, temperature, and remaining capacity. Specifically, the controller 16 stores the battery status parameters of the battery 13 in the non-volatile storage area of ​​the NFC chip 153. In this embodiment, when the wireless communication device 10 is in normal operating conditions, the NFC chip 153 is uniformly powered by the main control circuit board, and the controller 16 periodically acquires the battery status parameters of the battery 13 and writes them into the non-volatile storage area of ​​the NFC chip 153. Thus, when the wireless communication device 10 is in normal working condition, the NFC reader 20 can read the battery status parameters from the NFC chip 153 in real time. Utilizing the one-touch connection feature of NFC technology, users can use the NFC reader 20 to read the battery status parameters of the wireless communication device 10 in real time. This real-time readability of the battery status parameters of the wireless communication device 10 allows its design to meet the requirements of intelligence, information technology, and full lifecycle safety traceability. Taking the wireless communication device 10 as a charging device as an example, a user can read the battery status parameters of the charging device in real time via the NFC reader 20, such as a mobile phone, which meets the standard requirements of the charging device safety technical specifications.

[0046] In some embodiments, to improve the accuracy of the parameters, the controller 16 may also be configured to acquire the battery status parameters of the battery 13 in real time.

[0047] The portion of the housing 11 of the wireless communication device 10 corresponding to the coil module 151 is the NFC sensing area. This NFC sensing area allows the NFC reader 20 to read battery status parameters from the non-volatile storage area of ​​the NFC chip 153 when the device approaches it. Optionally, the NFC sensing area can be marked on the housing 11 of the wireless communication device 10. The NFC reader 20 can read data from the non-volatile storage area of ​​the NFC chip 153 by activating a radio frequency field when it approaches or touches the NFC sensing area.

[0048] Optionally, the main control circuit board also includes a battery management system 17, which monitors and obtains the battery status parameters of the battery 13. The controller 16 obtains the battery status parameters from the battery management system 17 according to a set period. In this embodiment, the battery management system 17 is introduced into the wireless communication device 10 to monitor the working status of the battery 13 in real time. This allows for real-time monitoring of the battery 13's working status parameters using the mature battery management system 17. The controller 16 connects to the battery management system 17 via a communication interface, such as an I2C interface or a UART interface. When the wireless communication device 10 is in normal working condition, the controller 16 can directly read the battery status parameters from the battery management system 17 periodically using the communication interface and store them in the non-volatile storage area of ​​the NFC chip 153. Please refer to [link to relevant documentation]. Figure 4 The diagram below illustrates the data flow between the NFC module 15 and the NFC reader 20, as shown in a specific example. S1 represents the battery management system 17 collecting basic battery status parameters. These parameters may include, but are not limited to, battery status parameters such as voltage, current, temperature, and remaining capacity. The battery management system 17 also calculates battery performance parameters such as battery health and cumulative cycle count in real time based on the collected basic status parameters. S2 represents the controller 16 reading data from the battery management system 17. S3 represents the controller 16 storing the read data into the non-volatile storage area of ​​the NFC chip 153. S4 represents the NFC reader 20 reading data from the NFC chip 153 by activating a radio frequency field sensor.

[0049] Optionally, the wireless communication device 10 also supports the NFC reader 20 reading data from the NFC chip 153 in passive interaction mode. For example, when the wireless communication device 10 is powered off or in a low-power state, when the NFC reader 20 approaches the NFC sensing area, the NFC chip 153 receives instant power based on the radio frequency field of the NFC reader 20, enabling the NFC reader 20 to read battery status parameters from the NFC chip 153. In this embodiment, when the wireless communication device 10 is low on power or experiences a power failure, the NFC reader 20 can activate the radio frequency field to instantly power the NFC chip 153 when it approaches the NFC sensing area, enabling the NFC reader 20 to read preset key data from the non-volatile storage area of ​​the NFC chip 153, thereby achieving fault tracing and life cycle status assessment. The key data can be the battery status parameters mentioned in the previous embodiment; or it can be other preset parameters that facilitate fault tracing and life cycle status assessment of the battery 13, such as battery health, cumulative cycle count, historical highest temperature, historical lowest temperature, fault codes, and other battery performance parameters. It should be noted that the instantaneous power supply provided by the NFC reader 20 to the NFC chip 153 by exciting a radio frequency field when it approaches the NFC sensing area is only sufficient for the power required to read data from the NFC chip 153 once. During normal operation of the wireless communication device 10, when the NFC reader 20 approaches the NFC sensing area to read data, the switching circuit at the power supply end of the NFC chip 153 will automatically select the higher power supply voltage provided by the power supply on the main control circuit board of the wireless communication device 10. When the wireless communication device 10 is powered off, lacks power, or malfunctions, the switching circuit at the power supply end of the NFC chip 153 will select the lower power supply voltage excited by the radio frequency field to obtain instantaneous power supply to support the data reading operation.

[0050] Optionally, the key data that the wireless communication device 10 supports reading in passive interaction mode includes battery status parameters. In some embodiments, when the wireless communication device 10 detects a power-off command or when the current battery level is lower than a preset threshold, the controller 16 immediately obtains the latest battery status parameters of the battery 13 and stores them in the non-volatile storage area of ​​the NFC chip 153. Therefore, when the wireless communication device 10 is powered off or in a low-power state, the NFC reader 20 can read the latest battery status parameters stored in the NFC chip 153 before the wireless communication device 10 was powered off or lost power when it approaches the NFC sensing area.

[0051] In other embodiments, the key data that the wireless communication device 10 supports reading in passive interaction mode includes battery performance data. During normal operation of the wireless communication device 10, the controller 16 can acquire battery performance data at set time intervals; or acquire battery performance data when the controller 16 detects a preset event, and store the battery performance data in the non-volatile storage area of ​​the NFC chip 153. It should be noted that in the embodiment using the battery management system 17, the controller 16 can directly acquire battery performance data from the battery management system 17 according to a preset strategy. This preset data is not limited to acquiring at set time intervals or acquiring when a preset event is detected, so that when the wireless communication device 10 is powered off or in a low-power state, the NFC reader 20 can read the battery performance data stored in the NFC chip 153 before the wireless communication device 10 was powered off or before it lost power when it approaches the NFC sensing area. Taking the wireless communication device 10 as a charging device as an example, the passive interaction mode of the wireless communication device 10 enables the charging device to meet the requirements for full life cycle testing of the battery 13 in the charging device safety technical specifications.

[0052] In summary, the wireless communication device 10 provided in this application embodiment has at least the following characteristics: First, by setting up the magnetic shielding component 14, the magnetic flux of the coil module 151 facing the outer metal of the battery is isolated. The magnetic shielding component 14 reconstructs the magnetic flux path and avoids the alternating magnetic flux of the coil module 151 penetrating the outer metal of the battery vertically and generating eddy currents in the metal. The magnetic shielding component 14 supports the stacking of the NFC chip 153 and the outer metal of the battery in a highly compact space environment, which effectively improves the reliability of NFC communication and is also conducive to the miniaturization and thinning of the product.

[0053] Second, during normal operation, when powered off, or when the battery is low on power, the wireless communication device 10 supports the NFC reader 20 in reading battery status parameters and / or battery performance parameters. These battery status parameters and / or battery performance parameters serve as crucial black box data for the wireless communication device 10 in safety assessment or fault tracing, providing important support for the wireless communication device 10 to meet the safety requirements throughout the product lifecycle.

[0054] In a typical application example, the wireless communication device 10 in the aforementioned embodiments is a charging device, such as a power bank or portable charger. The battery 13 is a battery pack (or a pouch battery), and the metal encapsulation layer 132 is an aluminum-plastic film; alternatively, the battery 13 is a cylindrical cell, and the metal encapsulation layer 132 is a steel casing.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wireless communication device, characterized in that, Includes a housing, a battery disposed within the housing, a wireless transmission module, and a magnetic shielding component; The battery includes a metal encapsulation layer; The wireless transmission module includes a coil module, which is located between the metal encapsulation layer and the outer shell; The magnetic shielding component is disposed between the coil module and the metal encapsulation layer, and the magnetic shielding component at least covers the surface of the coil module facing the metal encapsulation layer.

2. The wireless communication device according to claim 1, characterized in that, The material of the magnetic shielding component is ferrite or nanocrystalline soft magnetic alloy.

3. The wireless communication device according to claim 1, characterized in that, The size of the magnetic shielding component is greater than or equal to the size of the outermost coil of the coil module, and the projection of the outermost coil on the metal encapsulation layer is located within the projection range of the magnetic shielding component on the metal encapsulation layer.

4. The wireless communication device according to claim 3, characterized in that, The thickness of the magnetic shielding component is 0.05 mm to 0.5 mm.

5. The wireless communication device according to claim 3, characterized in that, The size of the magnetic shielding component is not less than 1.1 times the size of the outermost coil of the coil module.

6. The wireless communication device according to claim 1, characterized in that, The outer casing also contains a main control circuit board, on which a controller is mounted; The wireless transmission module also includes an NFC chip located on the main control circuit board; Under normal operating conditions of the wireless communication device, the controller acquires the battery status parameters of the battery and stores the battery status parameters in the NFC chip; the battery status parameters include at least one of the following: voltage, current, temperature, and remaining capacity.

7. The wireless communication device according to claim 6, characterized in that, The portion of the outer casing corresponding to the coil module is the NFC sensing area; the NFC sensing area is used for the NFC reading device to read the battery status parameters from the NFC chip when the NFC reading device is near it.

8. The wireless communication device according to claim 7, characterized in that, When the wireless communication device is powered off or in a low-power state, and the NFC reader is near the NFC sensing area, the NFC chip receives power based on the radio frequency field of the NFC reader to enable the NFC reader to read the battery status parameters from the NFC chip.

9. The wireless communication device according to claim 8, characterized in that, When the wireless communication device detects a power-off command or when the current battery level is lower than a preset threshold, the controller immediately obtains the latest battery status parameters of the battery and stores the latest battery status parameters in the NFC chip.

10. The wireless communication device according to claim 6, characterized in that, The main control circuit board is also equipped with a battery management system, which is used to monitor and obtain the battery status parameters of the battery; the controller obtains the battery status parameters from the battery management system according to a set period.

11. The wireless communication device according to claim 6, characterized in that, The controller acquires battery performance data according to a preset strategy and stores the battery performance data in the NFC chip. The preset strategy includes at least one of the following: acquiring at a set time interval, or acquiring when a preset event is detected; The battery performance data includes at least one of the following: battery health, cumulative cycle count, historical highest temperature, historical lowest temperature, and fault code.

12. A charging device, characterized in that, Includes the wireless communication device as described in any one of claims 1 to 11; wherein the battery is a battery pack and the metal encapsulation layer is an aluminum-plastic film; or, the battery is a cylindrical cell and the metal encapsulation layer is a steel shell.

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