Terminal device

Abstract

The embodiment of the invention provides terminal equipment, relates to the technical field of electronics, and is used for detecting whether a battery in the terminal equipment bulges or not under the condition of not sacrificing a battery expansion space. The terminal device comprises a first detection electrode and a flexible circuit board, the flexible circuit board comprises a second detection electrode, and the second detection electrode and the first detection electrode form a detection unit comprising a first capacitor. The detection unit may also include other capacitors connected in series with the first capacitor. In the detection unit, the second detection electrode is integrated in the flexible circuit board without additionally introducing other structures, so that the assembly gap between the battery and other parts is not influenced, and the safety of the battery is ensured. And the overall thickness of the terminal equipment is not influenced, and light and thin implementation is facilitated. Moreover, the second detection electrode is coupled with the first bonding pad, the coupling of the second detection electrode and the external detection circuit can be easily realized by means of the first bonding pad on the flexible circuit board, an additional switching path is not needed, and the structure is simple.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a terminal device. Background Art

[0002] Compared to traditional batteries like lead-acid batteries, lithium batteries have higher energy density and are lighter, making them widely used in mobile devices, new energy vehicles, and other fields. Lithium-ion batteries have gradually become the mainstream lithium battery product due to their low technical barriers, low manufacturing costs, and ease of large-scale promotion.

[0003] End devices are the most frequently used devices containing lithium-ion batteries. However, during use, lithium-ion batteries may swell, significantly increasing the probability of combustion and explosion, posing a significant threat to user safety and property. Therefore, real-time and effective battery bulge detection plays a vital role in reducing the risk of combustion and explosion and ensuring battery safety. Summary of the Invention

[0004] The present application provides a terminal device for detecting whether a battery in the terminal device is bulging or undergoing battery breathing without affecting the thickness direction of the electronic device.

[0005] According to a first aspect of an embodiment of the present application, a terminal device is provided, comprising: a battery, a first detection electrode, a flexible circuit board, and a third detection electrode. The first detection electrode is arranged on one side of the battery and is in a suspended state. The flexible circuit board is arranged between the battery and the first detection electrode, and the flexible circuit board comprises a first solder pad, a second detection electrode, and a first signal line. The second detection electrode and the first signal line are arranged on the same layer, one end of the second detection electrode is coupled to the first solder pad, and the other end of the second detection electrode is in a suspended state; the second detection electrode and the first detection electrode form a first capacitor, and the projection of the first capacitor on the plane where the battery is located overlaps with the battery. The third detection electrode and the first detection electrode form a second capacitor. The first capacitor and the second capacitor are connected in series through the first detection electrode as a detection unit for detecting battery bulging in the terminal device.

[0006] In the terminal device provided by the embodiment of the present application, the first detection electrode and the second detection electrode are correspondingly arranged to form a first capacitor, the first detection electrode and the third detection electrode are correspondingly arranged to form a second capacitor, and the first capacitor and the second capacitor are coupled in series through the first detection electrode to form a detection unit. One end of the second detection electrode is coupled to the first pad, and the other end of the second detection electrode is in a suspended state. The second detection electrode can serve as a variable acquisition electrode in the detection unit. The projection of the first capacitor on the plane where the battery is located overlaps with the battery, that is, the first capacitor is arranged corresponding to the battery, and the bulging of the battery can be fed back to the first capacitor, while the capacitance of the second capacitor remains fixed. Therefore, the battery bulging situation can be directly fed back through the change in the capacitance of the first capacitor. Then, by collecting the signal of the second detection electrode, it is possible to detect whether the battery is bulging and the battery breathing process, so that the terminal device has the ability to detect battery bulging and breathing process.

[0007] In addition, the second capacitor is coupled in series with the first capacitor, and the signal is coupled and transmitted through the second capacitor and the first capacitor, so that the first detection electrode does not need an external voltage signal and can be left in a suspended state. The first detection electrode, which is arranged in alignment with the battery, does not need to be coupled to other networks, which can reduce the limiting factors of the first detection electrode in terms of structure, position, interconnection and switching, and reduce the structural complexity of the first detection electrode and the risk of damage caused by interconnection and switching, thereby reducing costs and improving the reliability of the first detection electrode.

[0008] In addition, the second detection electrode is provided on the same layer as the first signal line of the flexible circuit board in the terminal device. The second detection electrode is integrated into the flexible circuit board, which simplifies the process and is easy to implement. Moreover, no additional structures are required, and the assembly clearance between the battery and other components is not affected, ensuring battery safety. It also does not affect the overall thickness of the terminal device, which facilitates lightweight and thinness. Furthermore, the second detection electrode is coupled to the first pad. With the help of the first pad on the flexible circuit board, the second detection electrode can be easily coupled to the external detection circuit without the need for additional switching paths, resulting in a simple structure.

[0009] In one possible implementation, the flexible circuit board further includes a shielding layer located on the surface of the flexible circuit board. The shielding layer includes a gap, and the projection of the second detection electrode on the shielding layer falls within the gap. The gap is arranged corresponding to the second detection electrode, so that the first detection electrode and the second detection electrode are directly opposite to each other to form a first capacitor. This prevents the shielding layer from forming a capacitor with the first detection electrode or the second detection electrode, reduces interference of the shielding layer on the second detection electrode, and improves detection accuracy.

[0010] In one possible implementation, the flexible circuit board further includes a second signal line, which is disposed between the second detection electrode and the first detection electrode; the second signal line is staggered with the second detection electrode. This staggered arrangement of the second signal line and the second detection electrode prevents capacitance from forming between the second signal line and the second detection electrode, reduces interference from the second signal line on the second detection electrode, and improves detection accuracy.

[0011] In one possible implementation, the projection of the third detection electrode on the plane where the battery resides does not overlap with the projection of the second detection electrode on the plane where the battery resides, i.e., they are offset. By offsetting the third detection electrode from the second detection electrode, capacitance between the third detection electrode and the second detection electrode can be avoided, reducing interference from the third detection electrode on the second detection electrode and improving detection accuracy.

[0012] In one possible implementation, the capacitance of the second capacitor is at least 0.5 times that of the first capacitor. When the capacitance of the second capacitor is at least 0.5 times that of the first capacitor and the capacitance remains unchanged, the effect of the second capacitor on the equivalent capacitance of the detection unit is almost negligible, and the sensitivity of battery bulge and breathing process detection depends on the capacitance change of the first capacitor C1.

[0013] In one possible implementation, the width of the second detection electrode is equal to the width of the first signal line. The second detection electrode and the first signal line have the same width, which can reduce the area of ​​the second detection electrode, thereby reducing the capacitance of the first capacitor and thus reducing the equivalent capacitance of the detection unit.

[0014] In one possible implementation, the third detection electrode is coupled to a fixed voltage terminal for receiving a fixed voltage. The third detection electrode serves as a fixed voltage electrode in the detection unit, the second detection electrode serves as a detection electrode, and the first and second capacitors connected in series serve as the detection unit, resulting in a simple structure.

[0015] In one possible implementation, the fixed voltage terminal is a reference ground. In this way, the third detection electrode can be a grounded conductive structure, which can reuse the existing grounded conductive structure in the terminal device without introducing a new conductive structure and increasing the complexity of the terminal device.

[0016] In one possible implementation, the third detection electrode includes a protective frame, a shielding cover, or an electronic device housing. The third detection electrode can reuse existing structures in the terminal device without introducing a new conductive structure and increasing the complexity of the terminal device.

[0017] In a possible implementation, the terminal device further includes a fourth detection electrode, and the fourth detection electrode and the third detection electrode form a third capacitor.

[0018] In one possible implementation, the length of the second detection electrode is less than the length of the first signal line. The capacitance of the first capacitor formed by the first detection electrode and the second detection electrode is positively correlated with the corresponding area of ​​the first detection electrode and the second detection electrode. By setting the length of the second detection electrode to be less than the length of the first signal line, the area of ​​the second detection electrode can be reduced, thereby reducing the corresponding area of ​​the first detection electrode and the second detection electrode, thereby reducing the capacitance of the first capacitor. Consequently, the equivalent capacitance of the detection unit including the first and second capacitors connected in series will ultimately decrease. Smaller equivalent capacitance can be detected using the existing capacitance detection circuit in the terminal device, eliminating the need for additional detection circuitry, thereby reducing costs.

[0019] In one possible implementation, the flexible circuit board includes multiple second detection electrodes, which, in conjunction with the first detection electrodes, form multiple first capacitors. That is, the terminal device includes multiple first capacitors. These first capacitors are spaced apart and distributed above the battery, with each first capacitor corresponding to a detection location. Multiple first capacitors can detect bulges at different locations on the battery, thereby improving detection coverage, increasing detection precision and accuracy, and reducing hardware implementation difficulty.

[0020] In one possible implementation, the terminal device further includes at least one detection circuit; each detection circuit is coupled to at least one second detection electrode, and the detection circuit is configured to determine whether the battery is bulging based on a detected signal. The detection circuit detects the signal on the second detection electrode and determines whether the battery is bulging by determining a capacitance value based on the detected signal.

[0021] In one possible implementation, the terminal device further includes a detection circuit and a second detection electrode, wherein the detection circuit is coupled to the second detection electrode. The number of detection units included in the terminal device is the same as the number of second detection electrodes. The terminal device includes a detection unit and a detection circuit, and has a simple structure.

[0022] In one possible implementation, the terminal device further includes a detection circuit and multiple second detection electrodes, wherein the detection circuit is coupled to the multiple second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Thus, one detection circuit can detect multiple detection units, thereby reducing the number of detection circuits.

[0023] In one possible implementation, the terminal device further includes multiple detection circuits and multiple second detection electrodes, and the multiple detection circuits are coupled to the multiple second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Then, different detection units are coupled to different detection circuits, and different detection circuits can detect the battery position corresponding to the coupled detection unit, thereby determining the location of the battery bulge.

[0024] In one possible implementation, the flexible printed circuit board further includes a detection circuit and a multiplexer; a first terminal of the multiplexer is coupled to the detection circuit, and multiple second terminals of the multiplexer are coupled to multiple second detection electrodes; the detection circuit is configured to determine whether the battery is bulging based on detected signals. A single multiplexer and a single detection circuit can detect multiple detection units corresponding to the multiple second detection electrodes. Furthermore, the terminal device does not need to include multiple detection circuits; the location of different detection units can be identified based on the time-sharing conduction function.

[0025] In a possible implementation, the terminal device further includes a rear housing, and the flexible circuit board and the first detection electrode are arranged between the battery and the rear housing. This is a possible application product.

[0026] In one possible implementation, the first detection electrode includes a wireless charging coil. The terminal device includes a wireless charging coil in a suspended state, and the wireless charging coil can be reused as the first detection electrode of the detection unit, so there is no need to add another electrode of the first capacitor. In other words, the presence of the first capacitor does not occupy additional thickness space of the terminal device, does not affect the assembly gap between the battery and other components, and ensures battery safety. It also does not affect the overall thickness of the terminal device, which is conducive to achieving lightweight and thinness. In addition, the wireless charging coil is used as a capacitor electrode in a suspended state, and there is no need to use a board-to-board connector or other methods to connect the wireless charging coil to an external signal, which can reduce costs.

[0027] In a possible implementation, the wireless charging coil includes a coil body and a first insulating layer, the first insulating layer covers the coil body, and the first insulating layer is attached to or bonded to the third detection electrode.

[0028] The first insulating layer is bonded or adhered to the third detection electrode. Then, the main medium of the second capacitor is the first insulating layer, and the capacitance medium of the second capacitor does not include air. The capacitance of the second capacitor is relatively large, and the impact on the capacitance of the detection unit can be almost ignored, so that the equivalent capacitance of the detection unit is almost linearly correlated with the capacitance of the first capacitor, thereby improving the detection sensitivity.

[0029] In one possible implementation, the first detection electrode includes a graphite layer. The terminal device includes a graphite layer in a suspended state, and the graphite layer can be reused as the first detection electrode of the detection unit, so the other electrode of the first capacitor does not need to be added. That is, the presence of the first capacitor will not take up additional thickness space of the terminal device, will not affect the assembly gap between the battery and other components, and ensure battery safety. It will not affect the overall thickness of the terminal device, which is conducive to achieving lightweight and thinness. In addition, the graphite layer is used as a capacitor electrode in a suspended state, and there is no need to use windowing and other processes to connect signals to the graphite layer, which reduces damage to the graphite layer and improves the reliability of the graphite layer.

[0030] In one possible implementation, the graphite layer includes a graphite body and a first insulating layer, the first insulating layer covering the graphite body, and the first insulating layer being bonded or adhered to the third detection electrode. The first insulating layer being bonded or adhered to the third detection electrode, the primary dielectric of the second capacitor is the first insulating layer, and the dielectric of the second capacitor does not include air. This results in a relatively large capacitance of the second capacitor, and a negligible effect on the capacitance of the detection unit. This results in an almost linear correlation between the equivalent capacitance of the detection unit and the capacitance of the first capacitor, thereby improving detection sensitivity.

[0031] In one possible implementation, a gap exists between the flexible circuit board and the first detection electrode. Because there is a gap between the first detection electrode and the flexible circuit board, the primary dielectric of the first capacitor is air. The relative dielectric constant of air (approximately 1) is smaller than that of the insulating medium, so the capacitance of the first capacitor is relatively small, and ultimately the equivalent capacitance of the detection unit is relatively small. The smaller equivalent capacitance can be detected using the existing capacitance detection circuit in the terminal device, eliminating the need for an additional detection circuit, thereby reducing costs.

[0032] In a possible implementation, the terminal device further includes a display module, and the flexible circuit board and the first detection electrode are arranged between the battery and the display module. This is a possible application product.

[0033] According to a second aspect of an embodiment of the present application, a terminal device is provided, comprising: a battery, a first detection electrode, and a flexible circuit board. The first detection electrode is disposed on one side of the battery, and the flexible circuit board is disposed between the battery and the first detection electrode. The flexible circuit board comprises a first solder pad, a second detection electrode, a first signal line, and a second insulating layer. The second detection electrode and the first signal line are disposed on the same layer. The second insulating layer is disposed on the side of the second detection electrode facing the first detection electrode, and the second insulating layer covers the second detection electrode. One end of the second detection electrode is coupled to the first solder pad, and the other end of the second detection electrode is suspended. The second detection electrode and the first detection electrode form a capacitor, and the projection of the capacitor on the second insulating layer overlaps with the projection of the battery on the second insulating layer.

[0034] In the terminal device provided in an embodiment of the present application, a second detection electrode is included within the flexible circuit board. One end of the second detection electrode is coupled to the first pad, while the other end of the second detection electrode is suspended. The second detection electrode can serve as a variable acquisition electrode. The first detection electrode and the second detection electrode are arranged in correspondence to form a capacitor. The first and second detection electrodes, which are arranged opposite each other, can serve as two detection electrodes within the same detection unit. The projection of the capacitor on the second insulating layer overlaps with the projection of the battery on the second insulating layer. That is, the detection unit is arranged in correspondence with the battery, and any bulging of the battery can be fed back to the detection unit. By collecting the signal from the second detection electrode, it is possible to detect whether the battery is bulging and the battery breathing process, thus enabling the terminal device to detect battery bulging and breathing processes. Furthermore, the second detection electrode is arranged on the same layer as the first signal line of the flexible circuit board in the terminal device, and the second detection electrode is integrated within the flexible circuit board, resulting in a simple process and easy implementation. Furthermore, no additional structures are required, and the assembly clearance between the battery and other components is not affected, thus ensuring battery safety. This also does not affect the overall thickness of the terminal device, facilitating a lightweight and thinner design. Furthermore, the second detection electrode is coupled to the first pad. The first pad on the flexible printed circuit can be used to easily couple the second detection electrode to an external detection circuit without adding an additional switching path, resulting in a simple structure.

[0035] In one possible implementation, the flexible circuit board includes multiple second detection electrodes, which, in conjunction with the first detection electrodes, form multiple capacitors. That is, the terminal device includes multiple capacitors. These capacitors are spaced apart above the battery, each corresponding to a detection location. Multiple capacitors can detect bulges at different locations on the battery, improving detection coverage, increasing detection precision and accuracy, and reducing hardware implementation complexity.

[0036] In one possible implementation, the terminal device further includes at least one detection circuit; each detection circuit is coupled to at least one second detection electrode, and the detection circuit is configured to determine whether the battery is bulging based on a detected signal. The detection circuit detects the signal on the second detection electrode and determines whether the battery is bulging by deriving a capacitance value based on the detected signal. The detection principle is well established.

[0037] In one possible implementation, the terminal device further includes a detection circuit and a second detection electrode, wherein the detection circuit is coupled to the second detection electrode. The number of detection units included in the terminal device is the same as the number of second detection electrodes. The terminal device includes a detection unit and a detection circuit, and has a simple structure.

[0038] In one possible implementation, the terminal device further includes a detection circuit and multiple second detection electrodes, wherein the detection circuit is coupled to the multiple second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Thus, one detection circuit can detect multiple detection units, thereby reducing the number of detection circuits.

[0039] In one possible implementation, the terminal device further includes multiple detection circuits and multiple second detection electrodes, and the multiple detection circuits are coupled to the multiple second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Then, different detection units are coupled to different detection circuits, and different detection circuits can detect the battery position corresponding to the coupled detection unit, thereby determining the location of the battery bulge.

[0040] In one possible implementation, the flexible printed circuit board further includes a detection circuit and a multiplexer; a first terminal of the multiplexer is coupled to the detection circuit, and multiple second terminals of the multiplexer are coupled to multiple second detection electrodes; the detection circuit is configured to determine whether the battery is bulging based on detected signals. A single multiplexer and a single detection circuit can detect multiple detection units corresponding to the multiple second detection electrodes. Furthermore, the terminal device does not need to include multiple detection circuits; the location of different detection units can be identified based on the time-sharing conduction function.

[0041] In a possible implementation, the terminal device further includes a rear housing, and the flexible circuit board and the first detection electrode are arranged between the battery and the rear housing. This is a possible application product.

[0042] In one possible implementation, the first detection electrode includes a wireless charging coil or a graphite layer. The first detection electrode can reuse the existing structure of the terminal device, without introducing a new conductive structure and without increasing the complexity of the terminal device.

[0043] In a possible implementation, the terminal device further includes a display module, and the flexible circuit board and the first detection electrode are arranged between the battery and the display module. This is a possible application product.

[0044] In one possible implementation, the display module includes a backplane, which serves as a first detection electrode. The first detection electrode can reuse an existing structure in the terminal device, without introducing a new conductive structure and increasing the complexity of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1A and Figure 1B An architectural diagram of a terminal device provided in an embodiment of the present application;

[0046] Figure 2A and Figure 2B An architectural diagram of another terminal device provided in an embodiment of the present application;

[0047] Figure 3 An architectural diagram of another terminal device provided in an embodiment of the present application;

[0048] Figure 4A and Figure 4B This is a diagram illustrating the structure of a flexible circuit board and a first detection electrode provided in an embodiment of the present application;

[0049] Figure 5A An architectural diagram of another terminal device provided in an embodiment of the present application;

[0050] Figure 5B A method provided in the embodiment of this application Figure 5A Cross-sectional view along O1-O2 direction;

[0051] Figure 5C and Figure 5D An architectural diagram of another terminal device provided in an embodiment of the present application;

[0052] Figure 6A and Figure 6B An architectural diagram of another terminal device provided in an embodiment of the present application;

[0053] Figure 7A A three-dimensional diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of the present application;

[0054] Figure 7B This is a structural diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of the present application;

[0055] Figure 7C An equivalent structure diagram of a first capacitor and a second capacitor provided in an embodiment of the present application;

[0056] Figure 7D A circuit topology diagram of a first capacitor and a second capacitor provided in an embodiment of the present application;

[0057] Figure 7E A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0058] Figure 8A and Figure 8B An architectural diagram of another terminal device provided in an embodiment of the present application;

[0059] Figure 9 An architectural diagram of another terminal device provided in an embodiment of the present application;

[0060] Figure 10An architectural diagram of another terminal device provided in an embodiment of the present application;

[0061] Figure 11A A schematic structural diagram of a flexible circuit board provided in an embodiment of the present application;

[0062] Figure 11B A method provided in the embodiment of this application Figure 11A A cross-sectional view along the A1-A2 direction;

[0063] Figure 11C A schematic structural diagram of another flexible circuit board provided in an embodiment of the present application;

[0064] Figure 11D A method provided in the embodiment of this application Figure 11C A cross-sectional view along the B1-B2 direction;

[0065] Figure 12 Another equivalent structure diagram of a first capacitor and a second capacitor provided in an embodiment of the present application;

[0066] Figures 13A-13D A layout diagram of a terminal device provided in an embodiment of the present application;

[0067] Figure 14 A layout diagram of another terminal device provided in an embodiment of the present application;

[0068] Figure 15A and Figure 15B This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0069] Reference numerals:

[0070] 1-terminal device; 20-display module; 30-middle frame; 40-back cover; 50-battery; 60-motherboard;

[0071] 71 - first detection electrode; 711 - electrode body; 712 - first insulating layer; 72 - second detection electrode; 73 - third detection electrode; 74 - fourth detection electrode; 75 - first signal line; 76 - second signal line; 77 - shielding layer; 80 - detection circuit; 90 - multiplexer;

[0072] FPC-flexible circuit board; P1-first solder pad; P2-second solder pad; P3-third solder pad; P4-fourth solder pad; P5-fifth solder pad; L2-second insulating layer; L3-third insulating layer; C-capacitor; C1-first capacitor; C2-second capacitor; C3-third capacitor. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0074] Hereinafter, the terms "second," "first," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature qualified as "second," "first," etc., may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0075] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left", and "right" may be defined including but not limited to the orientation relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative descriptions and clarifications, and may change accordingly according to changes in the orientation of the components in the drawings.

[0076] In the embodiments of this application, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can mean fixed connection, detachable connection, or integration; it can mean direct connection or indirect connection through an intermediate medium. In addition, the term "coupling" can mean direct electrical connection or indirect electrical connection through an intermediate medium. The term "contact" can mean direct contact or indirect contact through an intermediate medium.

[0077] In the embodiments of the present application, "and / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0078] An embodiment of the present application provides a terminal device, such as a consumer electronic product or a household electronic product, which includes a battery. Consumer electronic products include mobile phones, tablet computers, laptop computers, e-readers, personal computers (PCs), personal digital assistants (PDAs), desktop displays, smart wearable products (e.g., smart watches, smart bracelets, watch faces), virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, drones, and automobiles. Household electronic products include smart door locks, rechargeable small household appliances (e.g., soymilk makers, robot vacuums), and the like.

[0079] The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned terminal device. For the convenience of explanation, the following embodiments are all illustrated by taking the terminal device as a mobile phone.

[0080] Figure 1A and Figure 1B An architectural diagram of a terminal device provided in an embodiment of the present application.

[0081] like Figure 1A As shown, the embodiment of the present application provides a terminal device 1, which is a terminal device including a battery. Figure 1A As shown, the terminal device 1 mainly includes a display module 20 , a middle frame 30 , a rear shell 40 (or called a battery cover, shell) and a battery 50 .

[0082] The middle frame 30 is located between the display module 20 and the rear housing 40. The space between the middle frame 30 and the rear housing 40 creates an installation space for electronic components such as a printed circuit board (PCB), a battery, a receiver, a speaker, and a camera. The PCB can integrate electronic components such as the terminal's main controller, storage unit, antenna module, and power management module. The battery provides power to these components, including the display module 20, the PCB, the receiver, the speaker, and the camera.

[0083] The display module 20 has a light-emitting side through which the display image can be viewed and a back side opposite the light-emitting side. The rear housing 40 is located on the back side of the display module 20. The display module 20 includes an active display area (AA) for displaying images and a non-display area surrounding the active display area. The active display area includes multiple subpixels (SP).

[0084] In one possible embodiment, the display module 20 is a liquid crystal display (LCD). Therefore, the terminal device 1 further includes a backlight unit (BLU) located on the back of the LCD. The backlight unit can provide light to the LCD so that each sub-pixel in the LCD can emit light to display an image.

[0085] In another possible embodiment, the display module 20 is a self-luminous display module such as an organic light-emitting diode (OLED) display module, an active-matrix organic light-emitting diode (AMOLED) display module, a mini organic light-emitting diode (Mini-OLED) display module, a micro light-emitting diode (Micro-LED) display module, a micro organic light-emitting diode (Micro-OLED) display module, or a quantum dot light-emitting diode (QLED) display module. In this case, the display module 20 can be a rigid display module or a flexible display module.

[0086] In some embodiments, the display module 20 includes a display panel and a display driver integrated circuit (DDIC). The terminal device 1 also includes a driver controller and a motherboard. The driver controller is connected to the display driver integrated circuit. The display driver integrated circuit receives signals output by the driver controller and provides display signals to the display panel. The driver controller includes, for example, a system on chips (SOC). The driver controller is, for example, disposed on the motherboard.

[0087] In some embodiments, the display module 20 is a display module with a touch function. The display panel included in the display module 20 is also a display panel with a touch function. The terminal device 1 also includes a touch panel driver integrated circuit (TPIC), which is used to transmit touch signals.

[0088] In some embodiments, as Figure 1AAs shown, the battery 50 may be disposed between the middle frame 30 and the rear case 40 .

[0089] For example, the terminal device 1 also includes a flexible printed circuit (FPC), which is arranged between the battery 50 and the rear shell 40. For example, one end of the flexible printed circuit FPC is coupled to the mainboard, and the other end is connected to the speaker, microphone, charging port and other devices of the terminal device 1.

[0090] In other embodiments, Figure 1B As shown, the battery 50 can be disposed between the middle frame 30 and the display module 20 .

[0091] For example, the terminal device 1 also includes a flexible circuit board FPC, which is arranged between the battery 50 and the middle frame 30. For example, one end of the flexible circuit board FPC is coupled to the mainboard, and the other end is connected to the speaker, microphone, charging port and other devices of the terminal device 1.

[0092] Compared to traditional batteries like lead-acid batteries, lithium batteries have higher energy density and are lighter, making them widely used in mobile devices, new energy vehicles, and other fields. Lithium-ion batteries have gradually become the mainstream lithium battery product due to their low technical barriers, low manufacturing costs, and ease of large-scale promotion.

[0093] Terminal devices are the most frequently used devices containing lithium-ion batteries at close range. However, during use, lithium-ion batteries may bulge, significantly increasing the probability of combustion and explosion, posing a significant threat to the safety of users' lives and property. The swelling and breathing of the battery 50 and the battery 50's breathing process are important indicators for assessing the health of the battery 50. Real-time, non-destructive detection of battery 50 swelling and breathing helps to assess the health of the battery 50 in real time and prevent problems such as battery 50 explosion or swelling on the rear housing 40, which could cause irreversible damage to consumers and terminal devices 1. The battery 50 breathing process can be understood as the expansion and contraction process of the battery 50 during a single charge and discharge cycle.

[0094] Figure 2A and Figure 2B This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0095] In some embodiments, as Figure 2A As shown, the terminal device 1 includes a battery 50, a rear shell 40, a display module 20, a flexible circuit board FPC, a first electrode and a second electrode.

[0096] For example, Figure 2AAs shown, the flexible circuit board FPC is arranged between the battery 50 and the rear shell 40. For example, one end of the flexible circuit board FPC is coupled to the mainboard, and the other end is connected to the speaker, microphone, charging port and other devices of the terminal device 1.

[0097] The first electrode and the second electrode are disposed between the battery 50 and the rear housing 40 , and the second electrode and the first electrode form a capacitor C. When the battery 50 swells, the distance between the first electrode and the second electrode changes, causing the capacitance of the capacitor C to change, thereby detecting a bulge in the battery 50 .

[0098] Or, for example, Figure 2B As shown, a flexible circuit board (FPC) is disposed between the battery 50 and the display module 20. A first electrode and a second electrode are disposed between the battery 50 and the display module 20, and the second electrode and the first electrode form a capacitor C. When the battery 50 swells, the distance between the first electrode and the second electrode changes, causing the capacitance of the capacitor C to change, thereby detecting a bulge in the battery 50.

[0099] Figure 2A and Figure 2B Although the terminal device 1 shown can monitor whether the battery 50 has expanded, it requires the use of a first electrode and a second electrode, which results in the need to introduce two additional conductive layers into the terminal device 1, resulting in a complex structure and increased cost. Moreover, under normal circumstances, a certain amount of expansion space needs to be reserved between the battery 50 and the rear shell 40 or the display module 20. Under the current trend of ultra-thin design, after adding the first electrode and the second electrode, the gap will inevitably be reduced without affecting the thickness of the entire device. In the case of reducing the gap, the thickness of the entire device will inevitably increase. Furthermore, when the area of ​​the added first electrode and the second electrode is relatively large, the capacitance of the capacitor C will be relatively large, which will cause the existing capacitance detection circuit in the terminal device 1 to be unable to be applied to detect the capacitance of the capacitor C. It is necessary to add an additional detection circuit with greater capacitance detection capability, resulting in increased cost.

[0100] Figure 3 This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0101] The present application embodiment provides a terminal device, such as Figure 3 As shown, the terminal device 1 includes a battery 50, a first detection electrode 71 and a flexible circuit board FPC.

[0102] The first detection electrode 71 is disposed on one side of the battery 50. The first detection electrode 71 can be disposed on the side of the battery 50 facing the rear housing 40, or on the side of the battery 50 facing the display module 20. When the terminal device 1 further includes a middle frame 30, the first detection electrode 71 and the battery 50 can be located on the same side of the middle frame 30.

[0103] The flexible circuit board (FPC) and first detection electrode 71 are disposed between the battery 50 and the first detection electrode 71. For example, the flexible circuit board (FPC) may be the same flexible circuit board used to connect the speaker and the motherboard in the terminal device 1. The flexible circuit board (FPC) includes a second detection electrode 72. The second detection electrode 72 and the first detection electrode 71 form a first capacitor C1, which serves as a detection unit for detecting bulges in the battery 50. The projection of the first capacitor C1 onto the plane where the battery 50 resides overlaps with the battery 50. For example, the projection of the first capacitor C1 onto the plane where the battery 50 resides lies within the outline of the battery 50.

[0104] Figure 4A and Figure 4B This is a structural diagram of a flexible circuit board and a first detection electrode provided in an embodiment of the present application.

[0105] For example, Figure 4A As shown, the flexible circuit board FPC includes a first pad P1, a second detection electrode 72 and a first signal line 75. The second detection electrode 72 and the first signal line 75 are arranged on the same layer. For example, the first signal line and the second detection electrode 72 are insulated from each other.

[0106] The second detection electrode 72 and the first signal line 75 are disposed on the same layer. The second detection electrode 72 and the first signal line 75 can be formed simultaneously and made of the same material. Alternatively, the second detection electrode 72 and the first signal line 75 can be formed asynchronously and made of different materials. As long as the second detection electrode 72 and the first signal line 75 are located on the same insulating layer, they are considered to be disposed on the same layer in the embodiments of the present application. For example, a flexible circuit board (FPC) includes a wiring layer, and the wiring layer includes the second detection electrode 72 and the first signal line 75.

[0107] The second detection electrode 72 and the first detection electrode 71 form a first capacitor C1, for example, Figure 4A In the embodiment, the second detection electrode 72 and the first detection electrode 71 have opposing portions, and these opposing portions serve as the two electrodes of the first capacitor C1. The portions of the second detection electrode 72 and the first detection electrode 71 that are not positioned opposite each other, for example, may not serve as the capacitive electrodes of the first capacitor C1. For example, the flexible circuit board (FPC) further includes a third insulating layer L3, and the projection of the first detection electrode 71 on the third insulating layer L3 overlaps with the projection of the second detection electrode 72 on the third insulating layer L3. The overlapping portion corresponds to the portion of the first capacitor C1. The projection of the second detection electrode 72 on the third insulating layer L3 may be within the projection of the first detection electrode 71 on the third insulating layer L3, or may overlap with the projection of the first detection electrode 71 on the third insulating layer L3.

[0108] The embodiment of the present application is not limited to the first capacitor C1 being composed of the first detection electrode 71 and the second detection electrode 72. Figure 3 As shown, the portion between the first detection electrode 71 and the second detection electrode 72 (eg, an insulating layer, an air gap, etc.) can also be considered as a structural portion of the first capacitor C1. The first capacitor C1 serves as a detection unit of the terminal device.

[0109] The embodiments of the present application do not limit the physical position relationship between the first capacitor C1 and the battery 50. For example, when the display side of the terminal device 1 faces the user, regardless of whether the first capacitor C1 is located on the side of the battery 50 facing the user, or the first capacitor C1 is located on the side of the battery 50 away from the user, as long as the projection of the first capacitor C1 overlaps with the battery 50, the first capacitor C1 in the embodiments of the present application is located directly above the battery 50.

[0110] The flexible circuit board FPC further includes a first pad P1, one end of the second detection electrode 72 is coupled to the first pad P1, and the other end of the second detection electrode 72 is in a suspended state. When one end of the conductive structure is not connected to any electrical component, this end is said to be in a suspended state.

[0111] For example, Figure 4A In the embodiment, the other end of the second detection electrode 72 is not coupled to a pad on the flexible circuit board (FPC). For example, the other end of the second detection electrode 72 is retracted relative to the edge of the flexible circuit board (FPC). In other words, the second detection electrode 72 does not extend from one end of the flexible circuit board (FPC) to the other end, and the length of the second detection electrode 72 is shorter than the length of the first signal line 75. Alternatively, for example, the length of the second detection electrode 72 is the same as the length of the first signal line 75, but the other end of the second detection electrode 72 is suspended in the air.

[0112] The capacitance of the first capacitor C1 formed by the first detection electrode 71 and the second detection electrode 72 is positively correlated with the corresponding area of ​​the first detection electrode 71 and the second detection electrode 72. By setting the length of the second detection electrode 72 to be smaller than the length of the first signal line 75, the area of ​​the second detection electrode 72 can be reduced, thereby reducing the corresponding area of ​​the first detection electrode 71 and the second detection electrode 72, thereby reducing the capacitance of the first capacitor C1. As a result, the equivalent capacitance of the detection unit including the first capacitor C1 and the second capacitor C2 connected in series will ultimately be reduced. The smaller equivalent capacitance can be detected using the existing capacitance detection circuit in the terminal device 1, eliminating the need for additional detection circuitry, thereby reducing costs.

[0113] For example, the other end of the second detection electrode 72 is coupled to a pad in the flexible circuit board FPC, which is not coupled to a device port, that is, the pad is not used to connect the device. Therefore, the second detection electrode 72 is a whole trace and does not produce an antenna effect, thereby reducing interference with other signal lines.

[0114] The embodiment of the present application does not limit the structure of the first detection electrode 71 . The first detection electrode 71 may reuse an existing conductive structure in the terminal device 1 , or may be a newly added conductive structure.

[0115] In some embodiments, the flexible circuit board (FPC) further includes a second pad P2 and a third pad P3, and a first signal line 75 is coupled between the second pad P2 and the third pad P3 for transmitting a signal. The signal transmitted by the first signal line 75 can be a reference signal or other signal.

[0116] In some embodiments, as Figure 4A As shown, the flexible circuit board (FPC) further includes a second insulating layer L2, which covers the second detection electrode 72. The second insulating layer L2 is located between the second detection electrode 72 and the first detection electrode 71, serving as a capacitor dielectric and protecting the second detection electrode 72. The projection of the first capacitor C1 on the second insulating layer L2 overlaps with the projection of the battery 50 on the second insulating layer L2.

[0117] In some embodiments, as Figure 4B As shown, the terminal device further includes a detection circuit 80, which is used to determine whether the battery 50 is swollen based on the detected signal.

[0118] For example, the first detection electrode 71 is used to receive a fixed voltage, and the second detection electrode 72 is used as a detection electrode to feed back the capacitance change of the first capacitor C1.

[0119] For example, the first detection electrode 71 is coupled to a fixed voltage terminal of the detection circuit 80. Alternatively, for example, the first detection electrode 71 is coupled to another fixed voltage terminal in the terminal device 1. The fixed voltage terminal is, for example, a reference ground.

[0120] The first pad P1 is used to couple with the detection circuit 80, and the second detection electrode 72 serves as the detection electrode of the first capacitor C1. The detection circuit 80 detects the signal on the second detection electrode 72 through the first pad P1, thereby determining whether the battery 50 is bulging. For example, when the battery 50 is not bulging, the spacing between the first detection electrode 71 and the second detection electrode 72 is the first spacing, and the detection circuit 80 detects the first signal. In the case of a bulge in the battery 50, the battery 50 pushes the flexible circuit board FPC to deform, the flexible circuit board FPC is lifted up, and the spacing between the first detection electrode 71 and the second detection electrode 72 becomes the second spacing (smaller than the first spacing), and the detection circuit 80 detects the second signal. By determining whether the signal detected by the detection circuit 80 is the first signal or the second signal, it is possible to determine whether the battery 50 is bulging, thereby enabling monitoring of whether the battery 50 is bulging.

[0121] The detection circuit 80 obtains a first capacitance value based on the first signal and a second capacitance value based on the second signal. If the battery 50 bulges, the distance between the first detection electrode 71 and the second detection electrode 72 decreases, and the capacitance of the first capacitor C1 increases. If the second capacitance value is greater than the first capacitance value, the battery 50 is determined to be bulging. Alternatively, if the second capacitance value is greater than a set value, the battery 50 is determined to be bulging. The set value is greater than the first capacitance value. This allows the battery 50 to be detected only after the bulge reaches a certain level, thus reducing false positives.

[0122] In the terminal device 1 provided in an embodiment of the present application, a second detection electrode 72 is included within the flexible printed circuit board (FPC). One end of the second detection electrode 72 is coupled to the first pad P1, while the other end of the second detection electrode 72 is suspended. The second detection electrode 72 can serve as a variable acquisition electrode. The first detection electrode 71 and the second detection electrode 72 are arranged correspondingly to form a first capacitor C1. The first detection electrode 71 and the second detection electrode 72 arranged opposite each other can serve as two detection electrodes within the same detection unit. The first capacitor C1 falls within the contour of the battery 50, meaning that the detection unit is arranged correspondingly to the battery 50, and any bulging of the battery 50 can be fed back to the detection unit. Therefore, by collecting the signal from the second detection electrode 72, it is possible to detect whether the battery 50 is bulging and the breathing process of the battery 50, enabling the terminal device 1 to detect bulging and breathing processes of the battery 50. Furthermore, the second detection electrode 72 is arranged on the same layer as the first signal line 75 of the flexible printed circuit board (FPC) in the terminal device 1. The second detection electrode 72 is integrated within the flexible printed circuit board (FPC), simplifying the process and making it easy to implement. Furthermore, no additional structures are required, and the assembly clearance between the battery 50 and other components is not affected, ensuring the safety of the battery 50. This also does not affect the overall thickness of the terminal device 1, facilitating a lightweight and thinner design. Furthermore, the second detection electrode 72 is coupled to the first pad P1. This allows for easy coupling of the second detection electrode 72 to the external detection circuit via the first pad P1 on the flexible circuit board (FPC), eliminating the need for additional switching paths and maintaining a simple structure.

[0123] Figure 5A This is an architecture diagram of another terminal device provided in an embodiment of the present application. Figure 5B A method provided in the embodiment of this application Figure 5A Cross-sectional view along O1-O2 direction; Figure 5C and Figure 5D This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0124] In some embodiments, as Figure 5A As shown, the flexible circuit board FPC includes a plurality of second detection electrodes 72, for example, the plurality of second detection electrodes 72 are arranged at intervals. Figure 5BAs shown, the plurality of second detection electrodes 72 and the first detection electrodes 71 form a plurality of first capacitors C1 . For example, the flexible circuit board FPC includes a plurality of first pads P1 , and the plurality of first pads P1 are coupled to the plurality of second detection electrodes 72 in a one-to-one correspondence.

[0125] Each second detection electrode 72 forms a first capacitor C1 with the first detection electrode 71. The terminal device 1 includes multiple first capacitors C1. The first detection electrode 71 can be Figure 5A In the entire layer structure shown, the first detection electrode 71 may also include a plurality of substructures that are spaced apart or coupled to each other, and the plurality of substructures are arranged in a one-to-one correspondence with the plurality of second detection electrodes 72 .

[0126] When the terminal device 1 includes multiple first capacitors C1, the multiple first capacitors C1 are spaced apart above the battery 50, each first capacitor C1 can correspond to a detection position, and the multiple first capacitors C1 can detect bulging conditions at different positions of the battery 50, which can improve the detection coverage, increase the detection precision and accuracy, and reduce the difficulty of hardware implementation.

[0127] In some embodiments, the terminal device 1 further includes at least one detection circuit 80 , each detection circuit 80 is coupled to at least one first pad P1 , and the detection circuit 80 is used to determine whether the battery is bulging based on a detected signal.

[0128] For example, the terminal device 1 includes a first pad P1 and a detection circuit 80 , and the first pad P1 and the detection circuit 80 are coupled.

[0129] Or, for example, Figure 5A As shown, the terminal device 1 includes multiple second detection electrodes 72 and a detection circuit 80. One detection circuit 80 can be coupled to multiple second detection electrodes 72. Then, one detection circuit 80 can detect multiple detection units, which can save the number of detection circuits.

[0130] Or, for example, Figure 5C As shown, the terminal device 1 includes multiple second detection electrodes 72 and multiple detection circuits 80. The multiple second detection electrodes 72 can be coupled to the multiple detection circuits 80. Then, different detection units are coupled to different detection circuits 80, and different detection circuits 80 can detect the position of the battery 50 corresponding to the coupled detection unit, thereby determining the bulge position of the battery 50.

[0131] In some embodiments, as Figure 5DAs shown, the terminal device 1 includes a multiplexer 90, a plurality of second detection electrodes 72 and a detection circuit 80. A first terminal of the multiplexer 90 is coupled to the detection circuit 80, and a plurality of second terminals of the multiplexer 90 are coupled to the plurality of second detection electrodes 72 respectively.

[0132] The present embodiment does not limit the structure of the multiplexer 90. The structures of multiplexers in related art are applicable to the present embodiment. The multiplexer 90 can be set on the mainboard 60, and coupled with the plurality of first pads P1 and the detection circuit 80 through the mainboard 60.

[0133] The multiple second terminals of the multiplexer 90 are coupled to the multiple second detection electrodes 72. For example, at the same time, only one of the multiple second terminals is connected to the first terminal, so that the detection circuit 80 receives a signal from a first pad P1. At different times, the signals on different first pads P1 can be detected.

[0134] In this way, a multiplexer 90 and a detection circuit 80 can detect multiple detection units corresponding to multiple second detection electrodes 72. Moreover, there is no need to set up multiple detection circuits 80 in the terminal device 1. The locations of different detection units can be identified based on the time-sharing conduction function.

[0135] Figure 6A and Figure 6B This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0136] In some embodiments, as Figure 6A As shown, the terminal device 1 further includes a middle frame 30 and a rear shell 40 . A battery 50 is disposed on the middle frame 30 and between the middle frame 30 and the rear shell 40 . A flexible circuit board FPC and a first detection electrode 71 are disposed between the battery 50 and the rear shell 40 .

[0137] For example, a gap is provided between the battery 50 and the flexible printed circuit board (FPC). Alternatively, for example, the flexible printed circuit board (FPC) is disposed on the surface of the battery 50. Alternatively, for example, a gap is provided between the flexible printed circuit board (FPC) and the rear housing 40. This gap can be understood as providing space for the battery 50 to expand, and the specific size of the gap is not limited in this embodiment of the present application.

[0138] The terminal device 1 may further include a display module 20 , which is disposed on a side of the middle frame 30 away from the battery 50 .

[0139] The first detection electrode 71 can be, for example, a wireless charging coil or a graphite layer in the terminal device 1. The first detection electrode 71 can be coupled to a fixed voltage terminal (e.g., a reference ground) on the mainboard 60. The wireless charging coil or graphite layer can be windowed and coupled to the fixed voltage terminal on the mainboard 60 via a lead or a board-to-board (BTB) connector.

[0140] The second detection electrode 72 is coupled to the detection circuit 80 . The detection circuit 80 may be provided on the mainboard 60 , for example. The second detection electrode 72 is coupled to the detection circuit 80 via a circuit on the mainboard 60 .

[0141] In other embodiments, Figure 6B As shown, the terminal device 1 further includes a display module 20, a middle frame 30, and a rear cover 40. A battery 50 is disposed on the middle frame 30, and the battery 50 is located between the middle frame 30 and the display module 20. A flexible circuit board (FPC) and a first detection electrode 71 are disposed between the battery 50 and the display module 20.

[0142] In some embodiments, the display module includes touch electrodes, and the touch electrodes serve as the first detection electrodes 71 .

[0143] In some other embodiments, the display module 20 includes a back plate, and the back plate serves as the first detection electrode 71 .

[0144] The terminal device 1 includes a grounded backplane, which can be reused as the first detection electrode 71 of the detection unit. The second detection electrode 72 is coupled to the detection circuit 80, eliminating the need for additional electrodes for the first capacitor C1. In other words, the presence of the first capacitor C1 does not take up additional space in the thickness of the terminal device 1, nor does it affect the assembly clearance between the battery 50 and other components, ensuring battery safety. It also does not affect the overall thickness of the terminal device 1, facilitating its thinness and lightweight design.

[0145] Figure 7A A three-dimensional diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of the present application. Figure 7B This is a structural diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of the present application. Figure 7C An equivalent structure diagram of a first capacitor and a second capacitor provided in an embodiment of the present application, Figure 7D A circuit topology diagram of a first capacitor and a second capacitor provided in an embodiment of the present application. Figure 7E A schematic structural diagram of a battery pack provided in an embodiment of the present application.

[0146] In some embodiments, as Figure 7A and Figure 7BAs shown, both ends of the first detection electrode 71 are in a suspended state, and the terminal device 1 further includes a third detection electrode 73 , which forms a second capacitor C2 with the first detection electrode 71 .

[0147] The embodiment of the present application is not limited to the second capacitor C2 being composed of the first detection electrode 71 and the third detection electrode 73. The part located between the first detection electrode 71 and the third detection electrode 73 (such as the insulating layer, the air gap) can also be considered as a structural part of the second capacitor C2.

[0148] The third detection electrode 73 is used to couple with other networks to form a detection loop. Figure 7C As shown, the aforementioned other networks are fixed voltage providing networks (which can be voltage terminals or circuit modules), and the third detection electrode 73 is coupled to the fixed voltage terminal, which is, for example, the reference ground GND. The second detection electrode 72 is used as a detection electrode and is coupled to the detection circuit 80. Figure 7D As shown, the first capacitor C1 and the second capacitor C2 are two capacitors connected in series, and the detection unit includes the first capacitor C1 and the second capacitor C2 connected in series.

[0149] According to the calculation formula of series capacitance, the equivalent capacitance of the first capacitor C1 and the second capacitor C2 in series in the detection unit is c1 is the capacitance of the first capacitor C1, and c2 is the capacitance of the second capacitor C2. ε is a constant, S1 is the area facing each other between the first detection electrode 71 and the second detection electrode 72, d1 is the distance between the first detection electrode 71 and the second detection electrode 72, and k is the electrostatic force constant. S2 is the area facing each other between the first detection electrode 71 and the third detection electrode 73, and d2 is the distance between the first detection electrode 71 and the third detection electrode 73.

[0150] like Figure 7B As shown, when the battery 50 is not bulging, the distance between the first detection electrode 71 and the second detection electrode 72 is d1, and the distance between the first detection electrode 71 and the third detection electrode 73 is d2. Figure 7E As shown, in the case of a bulge in the battery 50, the distance from the first detection electrode 71 to the second detection electrode 72 becomes d1', and the distance from the first detection electrode 71 to the third detection electrode 73 remains d2. In the case of a bulge in the battery 50, the other parameters of the first capacitor C1 and the second capacitor C2 remain unchanged or hardly change. Therefore, only the capacitance c1 of the first capacitor C1 changes, and the capacitance c2 of the second capacitor C2 does not change. That is to say, during the entire detection process, the capacitance c2 of the second capacitor C2 remains unchanged, while the capacitance c1 of the first capacitor C1 changes, causing the equivalent capacitance c of the detection unit to change. Then, when the detection circuit 80 detects a change in capacitance, it can be concluded that the battery 50 has bulged.

[0151] The present embodiment does not limit the specific structure of the detection circuit 80. Any existing capacitance detection sensor in the terminal device 1 is applicable to the present embodiment. For example, a specific absorption rate sensor (SAR sensor), a microcontroller unit (MCU), a touch control chip, etc. in the terminal device 1 can all be used as the detection circuit 80.

[0152] In the terminal device 1 provided in the embodiment of the present application, the first detection electrode 71 and the second detection electrode 72 are correspondingly arranged to form a first capacitor C1, and the first detection electrode 71 and the third detection electrode 73 are correspondingly arranged to form a second capacitor C2. The first capacitor C1 and the second capacitor C2 are coupled in series via the first detection electrode 71 to form a detection unit. One end of the second detection electrode 72 is coupled to the first pad P1, and the other end of the second detection electrode 72 is suspended. The second detection electrode 72 can serve as a variable acquisition electrode in the detection unit. The projection of the first capacitor C1 on the plane where the battery 50 is located overlaps with the battery 50. That is, the first capacitor C1 is arranged corresponding to the battery 50. The bulging of the battery 50 can be fed back to the first capacitor C1, while the capacitance of the second capacitor C2 remains fixed. Therefore, the bulging status of the battery 50 can be directly fed back by the change in the capacitance of the first capacitor C1. Then, by collecting the signal from the second detection electrode 72, it is possible to detect whether the battery 50 is bulging and the breathing process of the battery 50, enabling the terminal device 1 to detect bulging and breathing of the battery 50. In addition, the second capacitor C2 is coupled in series with the first capacitor C1, and the signal is coupled and transmitted through the second capacitor C2 and the first capacitor C1, so that the first detection electrode 71 does not need an external voltage signal and can be in a suspended state. The first detection electrode 71 arranged in alignment with the battery 50 does not need to be coupled with other networks, which can reduce the limiting factors of the first detection electrode 71 in terms of structure, position, interconnection and transfer, reduce the structural complexity of the first detection electrode 71 and the risk of damage caused by interconnection and transfer, thereby reducing costs and improving the reliability of the first detection electrode 71. On this basis, the second detection electrode 72 is arranged on the same layer as the first signal line 75 of the flexible circuit board FPC in the terminal device 1, and the second detection electrode 72 is integrated in the flexible circuit board FPC, which is simple in process and easy to implement. Moreover, there is no need to introduce other additional structures, which will not affect the assembly gap between the battery 50 and other components, thereby ensuring the safety of the battery 50. It will not affect the overall thickness of the terminal device 1, which is conducive to achieving lightness and thinness. Furthermore, the second detection electrode 72 is coupled to the first pad P1 , and the first pad P1 on the flexible circuit board FPC can be used to easily couple the second detection electrode 72 to an external detection circuit without adding an additional switching path, resulting in a simple structure.

[0153] In some embodiments, the third detection electrode 73 is configured to receive a fixed voltage. For example, the third detection electrode 73 is coupled to a fixed voltage terminal. For example, the fixed voltage terminal is a reference ground or a voltage terminal that provides another voltage value. For example, the third detection electrode 73 is configured to receive a reference ground voltage, and the third detection electrode 73 is a grounded conductive structure in the terminal device 1.

[0154] Figure 8A and Figure 8B This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0155] For example, Figure 8A As shown, the third detection electrode 73 is a protection frame in the terminal device 1. For example, the protection frame includes a mainboard protection frame, a battery protection frame, etc. The protection frame is used to receive the reference ground voltage on the mainboard 60.

[0156] Or, for example, Figure 8A As shown, the third detection electrode 73 is a shielding cover in the terminal device 1. The present embodiment does not limit the specific type of shielding cover; the shielding cover can be any shielding cover in the terminal device 1. For example, the shielding cover includes a mainboard shielding cover, a small board shielding cover, etc., and is used to receive the reference ground voltage on the mainboard 60.

[0157] Or, for example, Figure 8B As shown, the third detection electrode 73 is an electronic device housing in the terminal device 1. For example, the electronic device housing includes a speaker housing, etc., which is used to receive the reference ground voltage.

[0158] The third detection electrode 73 can reuse the existing grounding conductive structure in the terminal device 1 , and no additional conductive structure is required. It has a simple structure, low cost, and does not affect the thickness of the terminal device 1 .

[0159] In some embodiments, as Figure 8B As shown, there is a gap between the flexible circuit board FPC and the first detection electrode 71, and the air in the gap serves as the capacitance medium of the first capacitor C1. The embodiment of the application does not limit the size of the gap, and it can be set in combination with the thickness requirement of the terminal device 1.

[0160] There is a gap between the first detection electrode 71 and the flexible circuit board FPC, so the main medium of the first capacitor C1 is air. The relative dielectric constant of air (about 1) is smaller than the relative dielectric constant of the insulating medium, so the constant ε of the first capacitor C1 is relatively small, and the capacitance c1 of the first capacitor C1 is relatively small. The smaller equivalent capacitance c can be detected by the existing capacitance detection circuit in the terminal device 1, without adding an additional detection circuit 80, thus reducing costs.

[0161] In some embodiments, as Figure 8A and Figure 8B As shown, the third detection electrode 73 is offset from the second detection electrode 72. Alternatively, the projection of the third detection electrode 73 on the plane where the battery 50 is located does not overlap with the projection of the second detection electrode 72 on the plane where the battery 50 is located. The third detection electrode 73 may overlap with the flexible circuit board (FPC), but the third detection electrode 73 does not overlap with the second detection electrode 72.

[0162] By staggering the third detection electrode 73 and the second detection electrode 72 , the formation of capacitance between the third detection electrode 73 and the second detection electrode 72 can be avoided, thereby reducing interference of the third detection electrode 73 on the second detection electrode 72 and improving detection accuracy.

[0163] Figure 9 This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0164] In some embodiments, as Figure 9 As shown, the first detection electrode 71 includes an electrode body 711 and a first insulating layer 712 , and the first insulating layer 712 covers the electrode body 711 . For example, the first insulating layer 712 wraps the electrode body 711 .

[0165] For example, the first insulating layer 712 is attached to the third detection electrode 73 , no other device structure is provided therebetween, and there is no gap therebetween. The first insulating layer 712 is in direct contact with the third detection electrode 73 .

[0166] Alternatively, for example, the first insulating layer 712 is bonded to the third detection electrode 73 .

[0167] Regardless of whether the first insulating layer 712 and the third detection electrode 73 are bonded or attached, there is no other structure between the first insulating layer 712 and the third detection electrode 73. The main dielectric of the second capacitor C2 is the first insulating layer 712. The dielectric of the second capacitor C2 does not include air. Therefore, ε of the second capacitor C2 is relatively large, and the capacitance value c2 of the second capacitor C2 is relatively large. It is relatively small and can be almost ignored, so that the equivalent capacitance c of the detection unit is almost linearly correlated with the capacitance c1 of the first capacitor C1, thereby improving the detection sensitivity.

[0168] For example, the first detection electrode 71 is a wireless charging coil, and the electrode body 711 is a coil body. For example, the coil body is a disk-shaped structure of a metal wire winding layer.

[0169] Alternatively, for example, the first detection electrode 71 is a graphite layer, and the electrode body 711 is a graphite body. For example, the graphite body is a layered structure formed of graphite.

[0170] In some embodiments, the capacitance c2 of the second capacitor C2 is greater than or equal to 0.5 times the capacitance c1 of the first capacitor C1. That is, c2>0.5c1. For example, c2>0.5c1, c2>1.0c1, c2>1.5c1, c2>2.0c1, c2>2.5c1, c2>3.0c1, c2>3.5c1, or c2>4.0c1.

[0171] The capacitance c2 of the second capacitor C2 is more than 0.5 times the capacitance c1 of the first capacitor C1. When the capacitance remains unchanged, the effect of the second capacitor C2 on the equivalent capacitance c of the detection unit is almost negligible. The sensitivity of battery bulging (or breathing process) detection depends on the change in the capacitance of the first capacitor C1.

[0172] Figure 10 This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0173] In some embodiments, as Figure 10 As shown, the terminal device 1 further includes a fourth detection electrode 74 , and the fourth detection electrode 74 and the third detection electrode 73 form a third capacitor C3 .

[0174] The third detection electrode 73 can be, for example, any conductive structure in the terminal device 1 that is suspended in the air. The fourth detection electrode 74 can be used to receive a fixed voltage. The fourth detection electrode 74 can also be suspended in the air to form a capacitor with other networks. The embodiment of the present application does not limit the number of capacitors included in the detection unit.

[0175] Illustratively, the fourth detection electrode 74 is a speaker housing or other grounded conductive structure.

[0176] At this time, the detection unit includes a first capacitor C1, a second capacitor C2 and a third capacitor C3 connected in series, and the equivalent capacitance of the detection unit is c3 is the capacitance of the third capacitor C3. S3 is the area of ​​the third detection electrode 73 and the fourth detection electrode 74 facing each other, and d4 is the distance between the third detection electrode 73 and the fourth detection electrode 74. Regardless of whether the battery 50 is bulging or not, the capacitance of the third capacitor C3 remains unchanged, and the equivalent capacitance c of the detection unit is still affected by the capacitance c1 of the first capacitor C1.

[0177] When the third detection electrode 73 is inconveniently coupled to a fixed voltage terminal, a fourth detection electrode 74 or a multi-stage conductive structure is added to transfer the signal to the fixed voltage terminal. The third detection electrode 73 and the fourth detection electrode 74 can both be conductive structures already in the terminal device 1, leveraging the existing architecture of the terminal device 1 to complete signal transfer without the need for additional device structures.

[0178] Figure 11AA schematic structural diagram of a flexible circuit board provided in an embodiment of the present application; Figure 11B A method provided in the embodiment of this application Figure 11A Cross-sectional view along A1-A2 direction.

[0179] In some embodiments, as Figure 11A As shown, the flexible circuit board FPC further includes a shielding layer 77, which is located on the surface of the flexible circuit board FPC. The shielding layer 77 includes a gap, and the projection of the second detection electrode 72 on the shielding layer 77 falls into the gap.

[0180] Or understand it as Figure 11B As shown, the projection of the gap on the third insulating layer L3 overlaps the projection of the second detection electrode 72 on the third insulating layer L3. Alternatively, shielding layer 77 is hollowed out directly above second detection electrode 72. Shielding layer 77 provides shielding for the flexible printed circuit board (FPC). For example, shielding layer 77 is copper foil located on the surface of the flexible printed circuit board (FPC).

[0181] The gap is provided corresponding to the second detection electrode 72 , so that the first detection electrode 71 and the second detection electrode 72 are directly opposite to each other to form a first capacitor C1 , which can reduce the interference of the shielding layer 77 on the second detection electrode 72 and improve detection accuracy.

[0182] In some embodiments, as Figure 11B As shown, the width of the second detection electrode 72 is equal to the width of the first signal line 75. The width of the first signal line 75 can be understood as the dimension of the first signal line 75 perpendicular to the extension direction.

[0183] The second detection electrode 72 and the first signal line 75 have the same width, which can reduce the difficulty of patterning and reduce the area of ​​the second detection electrode 72 to reduce the capacitance c1 of the first capacitor C1 and thus reduce the equivalent capacitance c of the detection unit.

[0184] exist Figure 11A From a viewing angle, the first detection electrode 71 may be disposed on a side of the shielding layer 77 away from the second detection electrode 72 , for example.

[0185] Figure 11C A schematic structural diagram of another flexible circuit board provided in an embodiment of the present application; Figure 11D A method provided in the embodiment of this application Figure 11C Cross-sectional view along B1-B2 direction.

[0186] In some embodiments, as Figure 11C As shown, the flexible circuit board FPC further includes a second signal line 76, and the second signal line 76 is arranged on the second detection electrode 72 toward the first detection electrode ( Figure 11COn one side (not shown), the second signal line 76 and the second detection electrode 72 are staggered.

[0187] Or understand it as Figure 11D As shown, the projection of the second signal line 76 on the third insulating layer L3 does not overlap with the projection of the second detection electrode 72 on the third insulating layer L3. Alternatively, a second wiring layer is provided on the side of the second detection electrode 72 facing the first detection electrode 71, and the second wiring layer includes the second signal line. The second wiring layer has a gap located above the second detection electrode 72, and the projection of this gap on the second insulating layer L2 overlaps the projection of the second detection electrode 72 on the second insulating layer L2. In other words, the second wiring layer has no conductive structure above the second detection electrode 72, and there is no space directly above the second detection electrode 72.

[0188] For example, Figure 11C As shown, the flexible circuit board FPC further includes a fourth pad P4 and a fifth pad P5 , and the second signal line 76 is coupled between the fourth pad P4 and the fifth pad P5 for transmitting signals.

[0189] The second signal line 76 and the second detection electrode 72 are staggered, which can reduce the interference of the second signal line 76 on the second detection electrode 72 and improve the detection accuracy.

[0190] Figure 12 This is another equivalent structure diagram of a first capacitor and a second capacitor provided in an embodiment of the present application.

[0191] In some embodiments, as Figure 12 As shown, the flexible circuit board (FPC) includes multiple second detection electrodes 72. These multiple second detection electrodes 72 and the first detection electrodes 72 form multiple first capacitors C1. Each first capacitor C1 and second capacitor C2 form a detection unit, and the terminal device includes multiple detection units. Alternatively, multiple detection units share the same second capacitor C2.

[0192] In some embodiments, the terminal device includes at least one detection circuit 80 , and each detection circuit 80 is coupled to at least one second detection electrode 72 .

[0193] Figures 13A-13D A layout diagram of a terminal device provided in an embodiment of the present application.

[0194] In some embodiments, as Figure 13A As shown, the terminal device 1 includes a second detection electrode. Then, the terminal device 1 includes a detection unit and a detection circuit 80.

[0195] In other embodiments, Figure 13BAs shown, the terminal device 1 includes a plurality of second detection electrodes. Then, the terminal device 1 includes a plurality of detection units and a detection circuit 80.

[0196] In some other embodiments, Figure 13C As shown, the terminal device 1 includes a plurality of second detection electrodes. Then, the terminal device 1 includes a plurality of detection units and a plurality of detection circuits 80 coupled accordingly.

[0197] In some further embodiments, Figure 13D As shown, the terminal device 1 includes multiple second detection electrodes. Therefore, the terminal device 1 includes multiple detection units, a multiplexer 90, and a detection circuit 80. For example, a first terminal of the multiplexer 90 is coupled to the detection circuit 80, and multiple second terminals of the multiplexer 90 are respectively coupled to the multiple second detection electrodes 72.

[0198] The detection unit in the terminal device 1 can be the detection unit including the first capacitor C1 described above, or the detection unit can be the detection unit including the first capacitor C1 and the second capacitor C2 connected in series, which is not limited in this embodiment of the present application. When the terminal device 1 includes multiple detection units, the structures of the multiple detection units can be the same or different.

[0199] Figure 14 A layout diagram of another terminal device provided in an embodiment of the present application.

[0200] In some embodiments, as Figure 14 As shown, the terminal device 1 includes a plurality of the above-mentioned flexible circuit boards FPC.

[0201] The second detection electrodes 72 on multiple flexible circuit boards (FPCs) can form a first capacitor C1 with the same first detection electrode 71, or with different first detection electrodes 71. The detection units where the multiple second detection electrodes 72 are located can be coupled to the same detection circuit 80, or to different detection circuits 80. Alternatively, the detection units where the multiple second detection electrodes 72 are located can be coupled to the same or different multiplexers 90.

[0202] Figure 15A and Figure 15B This is an architectural diagram of another terminal device provided in an embodiment of the present application.

[0203] Based on any of the above structures, in the first implementation, if Figure 15A As shown, the terminal device 1 further includes a middle frame 30 and a rear shell 40 . A battery 50 is disposed on the middle frame 30 and between the middle frame 30 and the rear shell 40 . A flexible circuit board FPC and a first detection electrode 71 are disposed between the battery 50 and the rear shell 40 .

[0204] For example, a gap is provided between the battery 50 and the flexible printed circuit board (FPC). Alternatively, for example, the flexible printed circuit board (FPC) is disposed on the surface of the battery 50. Alternatively, for example, a gap is provided between the flexible printed circuit board (FPC) and the rear housing 40. This gap can be understood as providing space for the battery 50 to expand, and the specific size of the gap is not limited in this embodiment of the present application.

[0205] In some embodiments, the first detection electrode 71 includes a wireless charging coil.

[0206] The terminal device 1 includes a wireless charging coil in a suspended state. The wireless charging coil can be reused as the first detection electrode 71 of the detection unit, so there is no need to add another electrode of the first capacitor C1. In other words, the presence of the first capacitor C1 does not occupy additional thickness space of the terminal device 1, does not affect the assembly gap between the battery 50 and other components, and ensures battery safety. It also does not affect the overall thickness of the terminal device 1, which is conducive to achieving lightweight and thinness. In addition, the wireless charging coil is used as a capacitor electrode in a suspended state, and there is no need to use a BTB connector or other methods to connect the wireless charging coil to an external signal, which can reduce costs.

[0207] In other embodiments, the first detection electrode 71 includes a graphite layer. The terminal device 1 includes a graphite layer in a suspended state, and the graphite layer can be reused as the first detection electrode 71 of the detection unit, so the other electrode of the first capacitor C1 does not need to be added. That is, the existence of the first capacitor C1 will not take up additional thickness space of the terminal device 1, will not affect the assembly gap between the battery 50 and other components, and ensure battery safety. It will not affect the overall thickness of the terminal device 1, which is conducive to achieving lightness and thinness. In addition, the graphite layer is used as a capacitor electrode in a suspended state, and there is no need to use windowing and other processes to connect signals to the graphite layer, which reduces damage to the graphite layer and improves the reliability of the graphite layer.

[0208] In the second implementation, Figure 15B As shown, the terminal device 1 further includes a display module 20 , and the flexible circuit board FPC and the first detection electrode 71 are arranged between the battery 50 and the display module 20 .

[0209] Compared with the first implementation, the setting position of the flexible circuit board FPC in the terminal device 1 in the second implementation is changed, and other structures can be the same as those in the first implementation, which will not be repeated here.

[0210] The first detection electrode 71 can be any conductive structure provided on the side of the flexible circuit board FPC of the terminal device 1 away from the battery 50. The first detection electrode 71 is suspended in the air. For example, the first detection electrode 71 can be a graphite layer or a metal heat sink.

[0211] The structure of the second capacitor C2 can be any of the above methods. Figure 15A and Figure 15B The above is only an illustration and does not constitute any limitation.

[0212] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A terminal device (1), characterized in that: The terminal device (1) comprises: Battery (50); A first detection electrode (71) is provided on one side of the battery (50), with both ends of the first detection electrode (71) in a suspended state; A flexible circuit board (FPC) is arranged between the battery (50) and the first detection electrode (71); the flexible circuit board (FPC) includes a first pad (P1), a second detection electrode (72) and a first signal line (75); the second detection electrode (72) and the first signal line (75) are arranged in the same layer, one end of the second detection electrode (72) is coupled to the first pad (P1), and the other end of the second detection electrode (72) is in a suspended state; the second detection electrode (72) and the first detection electrode (71) form a first capacitor (C1), and the projection of the first capacitor (C1) on the plane where the battery (50) is located overlaps with the battery (50); The third detection electrode (73) forms a second capacitor (C2) with the first detection electrode (71).

2. The terminal device (1) according to claim 1, characterized in that The flexible printed circuit (FPC) further includes a second signal line (76), which is arranged between the second detection electrode (72) and the first detection electrode (71); the second signal line (76) and the second detection electrode (72) are staggered.

3. The terminal device (1) according to claim 1 or 2, characterized in that The projection of the third detection electrode (73) on the plane where the battery (50) is located does not overlap with the projection of the second detection electrode (72) on the plane where the battery (50) is located.

4. The terminal device (1) according to any one of claims 1 to 3, characterized in that The capacitance of the second capacitor (C2) is more than 0.5 times the capacitance of the first capacitor (C1).

5. The terminal device (1) according to any one of claims 1 to 4, characterized in that: The width of the second detection electrode (72) is equal to the width of the first signal line (75).

6. The terminal device (1) according to any one of claims 1 to 5, characterized in that: The flexible circuit board (FPC) further includes a shielding layer (77), which is located on the surface of the flexible circuit board (FPC); the shielding layer (77) includes a gap, and the projection of the second detection electrode (72) on the shielding layer (77) falls into the gap.

7. The terminal device (1) according to any one of claims 1 to 6, characterized in that: The third detection electrode (73) is coupled to a fixed voltage terminal.

8. The terminal device (1) according to claim 7, characterized in that The fixed voltage terminal is a reference ground.

9. The terminal device (1) according to any one of claims 1 to 8, characterized in that: The third detection electrode (73) includes a protection frame, a shielding cover or an electronic device housing.

10. The terminal device (1) according to any one of claims 1 to 9, characterized in that: The terminal device (1) further comprises a fourth detection electrode (74), wherein the fourth detection electrode (74) and the third detection electrode (73) form a third capacitor (C3).

11. The terminal device (1) according to any one of claims 1 to 10, characterized in that: The length of the second detection electrode (72) is shorter than the length of the first signal line (75).

12. The terminal device (1) according to any one of claims 1 to 11, characterized in that: The flexible printed circuit (FPC) comprises a plurality of second detection electrodes (72), and the plurality of second detection electrodes (72) and the first detection electrodes (71) correspondingly form a plurality of first capacitors (C1).

13. The terminal device (1) according to any one of claims 1 to 12, characterized in that: The terminal device (1) further includes at least one detection circuit (80); Each detection circuit (80) is coupled to at least one of the second detection electrodes (72), and the detection circuit (80) is used to determine whether the battery (50) has a bulge based on a detected signal.

14. The terminal device (1) according to claim 12, characterized in that The terminal device (1) further includes a detection circuit (80) and a multiplexer (90); The first end of the multiplexer (90) is coupled to the detection circuit (80), and the plurality of second ends of the multiplexer (90) are coupled to the plurality of second detection electrodes (72) in a one-to-one correspondence; The detection circuit (80) is used to determine whether the battery (50) is bulging based on the detected signal.

15. The terminal device (1) according to any one of claims 1 to 14, characterized in that: The terminal device (1) further includes a rear housing (40), and the flexible printed circuit board (FPC) and the first detection electrode (71) are arranged between the battery (50) and the rear housing (40).

16. The terminal device (1) according to claim 15, characterized in that The first detection electrode (71) includes a wireless charging coil or a graphite layer.

17. The terminal device (1) according to claim 16, characterized in that The wireless charging coil comprises a coil body and a first insulating layer (712), wherein the first insulating layer (712) covers the coil body, and the first insulating layer (712) is attached or bonded to the third detection electrode (73).

18. The terminal device (1) according to claim 16, characterized in that The graphite layer comprises a graphite body and a first insulating layer (712), wherein the first insulating layer (712) covers the graphite body, and the first insulating layer (712) is attached or bonded to the third detection electrode (73).

19. The terminal device (1) according to any one of claims 1 to 16, characterized in that: The terminal device (1) further includes a display module (20), and the flexible printed circuit board (FPC) and the first detection electrode (71) are arranged between the battery (50) and the display module (20).

20. A terminal device (1), characterized in that The terminal device (1) comprises: Battery (50); a first detection electrode (71), disposed on one side of the battery (50); A flexible circuit board (FPC) is arranged between the battery (50) and the first detection electrode (71); the flexible circuit board (FPC) comprises a first solder pad (P1), a second detection electrode (72), a first signal line (75) and a second insulating layer (L2); the second detection electrode (72) and the first signal line (75) are arranged on the same layer, the second insulating layer (L2) is arranged on the side of the second detection electrode (72) facing the first detection electrode (71), and the second insulating layer (L2) covers the second detection electrode (72); one end of the second detection electrode (72) is coupled to the first solder pad (P1), and the other end of the second detection electrode (72) is in a suspended state; the second detection electrode (72) and the first detection electrode (71) form a capacitor, and the projection of the capacitor on the second insulating layer (L2) overlaps with the projection of the battery (50) on the second insulating layer (L2).

21. The terminal device (1) according to claim 20, characterized in that The flexible printed circuit (FPC) includes a plurality of the second detection electrodes (72), and the plurality of the second detection electrodes (72) and the first detection electrodes (71) correspondingly form a plurality of the capacitors.

22. The terminal device (1) according to claim 20 or 21, characterized in that The terminal device (1) further includes at least one detection circuit (80); Each detection circuit (80) is coupled to at least one of the second detection electrodes (72), and the detection circuit (80) is used to determine whether the battery (50) has a bulge based on a detection signal.

23. The terminal device (1) according to claim 21, characterized in that The flexible circuit board (FPC) further includes a detection circuit (80) and a multiplexer (90); One end of the multiplexer (90) is coupled to the detection circuit (80), and the other end of the multiplexer (90) is coupled to a plurality of the second detection electrodes (72); The detection circuit (80) is used to determine whether the battery (50) is bulging based on the detected signal.

24. The terminal device (1) according to any one of claims 20 to 23, characterized in that The terminal device (1) further includes a rear shell (40), the flexible printed circuit board (FPC) and the first detection electrode (71) are arranged between the battery (50) and the rear shell (40); the first detection electrode (71) includes a wireless charging coil or a graphite layer.

25. The terminal device (1) according to any one of claims 20 to 23, characterized in that: The terminal device (1) further includes a display module (20), the flexible printed circuit board (FPC) and the first detection electrode (71) are arranged between the battery (50) and the display module (20); the display module (20) includes a backplane, and the backplane serves as the first detection electrode (71).

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