Terminal device

Abstract

A terminal device (1), which relates to the technical field of electronics, and is used for detecting whether a battery (50) in the terminal device (1) has swollen without sacrificing an expansion space of the battery (50). The terminal device (1) comprises a first detection electrode (71) and a flexible circuit board (FPC), wherein the flexible circuit board (FPC) comprises a second detection electrode (72), and the second detection electrode (72) and the first detection electrode (71) form a detection unit comprising a first capacitor (C1). The detection unit may further comprise other capacitors connected in series to the first capacitor (C1). In the detection unit, the second detection electrode (72) is integrated in the flexible circuit board (FPC), without the need for additionally introducing other structures, so that assembly gaps between the battery (50) and other components are not affected, the safety of the battery (50) is ensured, and the overall thickness of the terminal device (1) is not affected, thereby facilitating lightening and thinning. Furthermore, the second detection electrode (72) is coupled to a first pad (P1), and the coupling between the second detection electrode (72) and an external detection circuit can be easily implemented by means of the first pad (P1) on the flexible circuit board (FPC), without the need for an additional routing path, thereby achieving a simple structure.

Description

terminal equipment

[0001] This application claims priority to Chinese Patent Application No. 202510373029.2, filed with the State Intellectual Property Office of China on March 25, 2025, entitled “Terminal Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic technology, and more particularly to a terminal device. Background Technology

[0003] Compared to traditional batteries such as 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. Among them, lithium-ion batteries have gradually become the mainstream lithium battery product due to their lower technological barriers, lower manufacturing costs, and ease of large-scale promotion.

[0004] Terminal devices are the most frequently used devices containing lithium-ion batteries. However, during use, lithium-ion batteries may bulge and expand, greatly increasing the probability of combustion and explosion, posing a significant threat to users' life and property safety. Therefore, real-time and effective detection of battery bulging status plays a crucial role in reducing the risk of battery combustion and explosion and ensuring battery safety. Summary of the Invention

[0005] This application provides a terminal device for detecting whether a battery in the terminal device is bulging or experiencing a breathing process without affecting the thickness direction of the electronic device.

[0006] A first aspect of this application provides a terminal device, comprising: a battery, a first detection electrode, a flexible circuit board, and a third detection electrode. The first detection electrode is disposed on one side of the battery and is in a suspended state. The flexible circuit board is disposed between the battery and the first detection electrode, and includes a first pad, a second detection electrode, and a first signal line. The second detection electrode and the first signal line are disposed on the same layer. 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 and the first detection electrode form a first capacitor, and the projection of the first capacitor onto the plane of the battery 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 and serve as a detection unit for detecting battery bulging in the terminal device.

[0007] In the terminal device provided in this application embodiment, a first detection electrode and a second detection electrode are correspondingly configured to form a first capacitor, and a first detection electrode and a third detection electrode are correspondingly configured to form a second capacitor. The first and second capacitors are connected in series through the first detection electrode to form a detection unit. One end of the second detection electrode is coupled to a first pad, and the other end of the second detection electrode is in a floating state. The second detection electrode can serve as a variable acquisition electrode in the detection unit. The projection of the first capacitor onto the plane where the battery is located overlaps with the battery, that is, the first capacitor is correspondingly configured with the battery. The bulging of the battery can be fed back to the first capacitor, while the capacitance value of the second capacitor remains constant. Therefore, the battery bulging status can be directly fed back through the change in the capacitance value of the first capacitor. Thus, by acquiring the signal from the second detection electrode, it is possible to detect whether the battery is bulging and the battery breathing process, enabling the terminal device to have the capability to detect battery bulging and the breathing process.

[0008] Furthermore, the second capacitor is connected in series with the first capacitor, and the signal is transmitted through the coupling between the second and first capacitors. This allows the first detection electrode to remain in a floating state without an external voltage signal. The first detection electrode, aligned with the battery, does not need to be coupled to other networks, reducing constraints on its structure, location, and interconnection, thus lowering its structural complexity and reducing the risk of damage from interconnection, thereby reducing costs and improving its reliability.

[0009] Furthermore, the second detection electrode is located on the same layer as the first signal line of the flexible circuit board in the terminal device. The second detection electrode is integrated within the flexible circuit board, simplifying the manufacturing process and making it easy to implement. Moreover, it eliminates the need for additional structures, ensuring the assembly clearance between the battery and other components and guaranteeing battery safety. It also does not affect the overall thickness of the terminal device, contributing to a thinner and lighter design. Furthermore, the second detection electrode is coupled to the first pad. The first pad on the flexible circuit board allows for easy coupling between the second detection electrode and external detection circuitry without requiring additional connection paths, resulting in a simple structure.

[0010] In one possible implementation, the flexible circuit board further includes a shielding layer located on its surface. The shielding layer includes gaps into which the projection of the second detection electrode onto the shielding layer falls. The gaps are positioned corresponding to the second detection electrode, allowing the first and second detection electrodes to directly form a first capacitor. This avoids the shielding layer forming a capacitor with either the first or second detection electrode, reducing interference from the shielding layer on the second detection electrode and improving detection accuracy.

[0011] In one possible implementation, the flexible circuit board further includes a second signal line disposed between the second detection electrode and the first detection electrode; the second signal line is offset from the second detection electrode. This offset arrangement prevents the second signal line from forming a capacitance with the second detection electrode, reducing interference from the second signal line to the second detection electrode and improving detection accuracy.

[0012] In one possible implementation, the projection of the third detection electrode onto the plane of the battery does not overlap with the projection of the second detection electrode onto the same plane; that is, they are misaligned. By misaligning the third and second detection electrodes, capacitance can be avoided between them, reducing interference from the third detection electrode to the second detection electrode and improving detection accuracy.

[0013] In one possible implementation, the capacitance of the second capacitor is at least 0.5 times that of the first capacitor. With the capacitance of the second capacitor at least 0.5 times that of the first capacitor and remaining constant, the effect of the second capacitor on the equivalent capacitance of the detection unit is almost negligible, and the sensitivity of detecting battery bulging and breathing processes depends on the capacitance change of the first capacitor C1.

[0014] In one possible implementation, the width of the second detection electrode is equal to the width of the first signal line. Having the second detection electrode and the first signal line of the same width reduces the area of ​​the second detection electrode, thereby reducing the capacitance of the first capacitor and consequently reducing the equivalent capacitance of the detection unit.

[0015] In one possible implementation, the third detection electrode is coupled to a fixed voltage terminal to receive a fixed voltage. The third detection electrode serves as the fixed voltage electrode in the detection unit, the second detection electrode serves as the detection electrode, and the first and second capacitors connected in series form the detection unit, resulting in a simple structure.

[0016] In one possible implementation, the fixed voltage terminal is used as the reference ground. In this way, the third detection electrode can be a grounded conductive structure, reusing the existing grounded conductive structure in the terminal device without introducing a new conductive structure, thus not increasing the complexity of the terminal device.

[0017] 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 new conductive structures, thus not increasing the complexity of the terminal device.

[0018] In one possible implementation, the terminal device further includes a fourth detection electrode, which together with the third detection electrode forms a third capacitor.

[0019] 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 and second detection electrodes is positively correlated with the corresponding area of ​​the first and second detection electrodes. 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 and second detection electrodes and thus reducing the capacitance of the first capacitor. Therefore, the equivalent capacitance of the detection unit, including the first and second capacitors connected in series, will ultimately decrease. The smaller equivalent capacitance can be detected using the existing capacitance detection circuit in the terminal device, eliminating the need for additional detection circuitry and reducing costs.

[0020] In one possible implementation, the flexible circuit board includes multiple second detection electrodes, which, together with the first detection electrode, form multiple first capacitors. That is, the terminal device includes multiple first capacitors. These first capacitors are spaced apart above the battery, with each first capacitor corresponding to a detection position. The multiple first capacitors can detect bulging at different locations on the battery, improving detection coverage, increasing detection accuracy and precision, and reducing hardware implementation complexity.

[0021] 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 used to determine whether the battery is bulging based on the detected signal. The detection circuit detects the signal on the second detection electrode and obtains the capacitance value based on the detected signal to determine whether bulging has occurred.

[0022] In one possible implementation, the terminal device further includes a detection circuit and a second detection electrode, the detection circuit being 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 one detection unit and one detection circuit, resulting in a simple structure.

[0023] In one possible implementation, the terminal device further includes a detection circuit and multiple second detection electrodes, with the detection circuit 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. Therefore, one detection circuit can detect multiple detection units, reducing the number of detection circuits required.

[0024] In one possible implementation, the terminal device further includes multiple detection circuits and multiple second detection electrodes, with the detection circuits correspondingly coupled to the second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Thus, 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.

[0025] In one possible implementation, the flexible circuit board further includes a detection circuit and a multiplexer; the first terminal of the multiplexer is coupled to the detection circuit, and multiple second terminals of the multiplexer are correspondingly coupled to multiple second detection electrodes; the detection circuit is used to determine whether the battery has bulged based on the detected signal. A single multiplexer and a single detection circuit can detect multiple detection units corresponding to multiple second detection electrodes. Moreover, the terminal device does not need to be equipped with multiple detection circuits; it can identify the location of different detection units based on the time-division multiplexing function.

[0026] In one possible implementation, the terminal device also includes a back cover, a flexible circuit board, and a first detection electrode disposed between the battery and the back cover. This is one possible application product.

[0027] In one possible implementation, the first detection electrode includes a wireless charging coil. Since the terminal device includes a wireless charging coil in a suspended state, this coil can be reused as the first detection electrode of the detection unit, eliminating the need for an additional electrode for the first capacitor. That is, the presence of the first capacitor does not occupy additional thickness space in the terminal device, does not affect the assembly clearance between the battery and other components, ensuring battery safety. It also does not affect the overall thickness of the terminal device, contributing to a thinner and lighter design. Furthermore, using the wireless charging coil as a suspended capacitor electrode eliminates the need for board-to-board connectors or other methods to connect external signals to the wireless charging coil, reducing costs.

[0028] In one possible implementation, the wireless charging coil includes a coil body and a first insulating layer covering the coil body, and the first insulating layer is attached or bonded to a third detection electrode.

[0029] If the first insulating layer is bonded or adhered to the third detection electrode, then the main dielectric of the second capacitor is the first insulating layer. Since the dielectric of the second capacitor does not include air, the capacitance value of the second capacitor is relatively large, and its influence on the capacitance value of the detection unit is almost negligible. This makes the equivalent capacitance value of the detection unit almost linearly related to the capacitance value of the first capacitor, thereby improving the detection sensitivity.

[0030] In one possible implementation, the first detection electrode includes a graphite layer. Since the terminal device includes a suspended graphite layer, this layer can be reused as the first detection electrode of the detection unit, eliminating the need for an additional electrode for the first capacitor. That is, the presence of the first capacitor does not occupy additional thickness space in the terminal device, does not affect the assembly clearance between the battery and other components, and ensures battery safety. It also does not affect the overall thickness of the terminal device, contributing to a thinner and lighter design. Furthermore, using the graphite layer as a suspended capacitor electrode eliminates the need for processes such as windowing to externally connect the graphite layer to the signal, reducing damage to the graphite layer and improving its reliability.

[0031] In one possible implementation, the graphite layer includes a graphite body and a first insulating layer, which covers the graphite body and is attached or bonded to the third detection electrode. Since the first insulating layer is attached or bonded to the third detection electrode, the primary dielectric of the second capacitor is the first insulating layer. The dielectric of the second capacitor does not include air, resulting in a relatively large capacitance value. This negligible impact on the capacitance value of the detection unit makes the equivalent capacitance value of the detection unit almost linearly related to the capacitance value of the first capacitor, thereby improving detection sensitivity.

[0032] In one possible implementation, a gap exists between the flexible circuit board and the first detection electrode. Because of this gap, the primary dielectric of the first capacitor is air. The relative permittivity of air (around 1) is smaller than that of the insulating dielectric, resulting in a smaller capacitance value for the first capacitor and consequently a smaller equivalent capacitance value for the detection unit. This smaller equivalent capacitance value can be detected using the existing capacitance detection circuit in the terminal device, eliminating the need for additional detection circuitry and reducing costs.

[0033] In one possible implementation, the terminal device further includes a display module, a flexible circuit board, and a first detection electrode disposed between the battery and the display module. This is one possible application product.

[0034] A second aspect of this application provides a terminal device, 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 includes a first 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 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 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 onto the second insulating layer overlaps with the projection of the battery onto the second insulating layer.

[0035] In the terminal device provided in this application embodiment, the flexible circuit board includes a second detection electrode. One end of the second detection electrode is coupled to a first pad, and the other end is suspended. The second detection electrode can serve as a variable acquisition electrode. The first and second detection electrodes are correspondingly configured to form a capacitor. The oppositely configured first and second detection electrodes can serve as two detection electrodes in the same detection unit. The projection of the capacitor onto the second insulating layer overlaps with the projection of the battery onto the second insulating layer; that is, the detection unit is correspondingly configured with the battery, and battery bulging can be fed back to the detection unit. Therefore, by acquiring the signal from the second detection electrode, it is possible to detect whether the battery is bulging and the battery's breathing process, enabling the terminal device to detect battery bulging and breathing. Furthermore, the second detection electrode is configured 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, simplifying the process and making it easy to implement. Moreover, no additional structures are required, and the assembly gap between the battery and other components is not affected, ensuring battery safety. It also does not affect the overall thickness of the terminal device, contributing to a thinner and lighter design. Furthermore, the second detection electrode is coupled to the first pad. The second detection electrode can be easily coupled to the external detection circuit by means of the first pad on the flexible circuit board, without the need for additional transfer paths, resulting in a simple structure.

[0036] In one possible implementation, the flexible circuit board includes multiple second detection electrodes, which, together with the first detection electrode, form multiple capacitors. That is, the terminal device includes multiple capacitors. These capacitors are spaced apart above the battery, with each capacitor corresponding to a detection position. The multiple capacitors can detect bulging at different locations on the battery, improving detection coverage, increasing detection accuracy and precision, and reducing hardware implementation complexity.

[0037] 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 used to determine whether the battery has bulged based on the detected signal. The detection circuit detects the signal on the second detection electrode, and determines whether bulging has occurred based on the capacitance value obtained from the detected signal; the detection principle is mature.

[0038] In one possible implementation, the terminal device further includes a detection circuit and a second detection electrode, the detection circuit being 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 one detection unit and one detection circuit, resulting in a simple structure.

[0039] In one possible implementation, the terminal device further includes a detection circuit and multiple second detection electrodes, with the detection circuit 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. Therefore, one detection circuit can detect multiple detection units, reducing the number of detection circuits required.

[0040] In one possible implementation, the terminal device further includes multiple detection circuits and multiple second detection electrodes, with the detection circuits correspondingly coupled to the second detection electrodes. The number of detection units included in the terminal device is the same as the number of second detection electrodes. Thus, 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.

[0041] In one possible implementation, the flexible circuit board further includes a detection circuit and a multiplexer; the first terminal of the multiplexer is coupled to the detection circuit, and multiple second terminals of the multiplexer are correspondingly coupled to multiple second detection electrodes; the detection circuit is used to determine whether the battery has bulged based on the detected signal. A single multiplexer and a single detection circuit can detect multiple detection units corresponding to multiple second detection electrodes. Moreover, the terminal device does not need to be equipped with multiple detection circuits; it can identify the location of different detection units based on the time-division multiplexing function.

[0042] In one possible implementation, the terminal device also includes a back cover, a flexible circuit board, and a first detection electrode disposed between the battery and the back cover. This is one possible application product.

[0043] 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 in the terminal device without introducing a new conductive structure, thus not increasing the complexity of the terminal device.

[0044] In one possible implementation, the terminal device further includes a display module, a flexible circuit board, and a first detection electrode disposed between the battery and the display module. This is one possible application product.

[0045] In one possible implementation, the display module includes a backplane, which serves as a first detection electrode. The first detection electrode can reuse existing structures in the terminal device without introducing new conductive structures, thus not increasing the complexity of the terminal device. Attached Figure Description

[0046] Figures 1A and 1B are architectural diagrams of a terminal device provided in an embodiment of this application;

[0047] Figures 2A and 2B are architectural diagrams of another terminal device provided in the embodiments of this application;

[0048] Figure 3 is an architecture diagram of another terminal device provided in an embodiment of this application;

[0049] Figures 4A and 4B are architectural diagrams of a flexible circuit board and a first detection electrode provided in an embodiment of this application;

[0050] Figure 5A is an architecture diagram of another terminal device provided in an embodiment of this application;

[0051] Figure 5B is a cross-sectional view along the O1-O2 direction in Figure 5A provided by an embodiment of this application;

[0052] Figures 5C and 5D are architectural diagrams of another terminal device provided in the embodiments of this application;

[0053] Figures 6A and 6B are architectural diagrams of another terminal device provided in the embodiments of this application;

[0054] Figure 7A is a perspective view of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of this application;

[0055] Figure 7B is a structural diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of this application;

[0056] Figure 7C is an equivalent structural diagram of a first capacitor and a second capacitor provided in an embodiment of this application;

[0057] Figure 7D is a circuit topology diagram of a first capacitor and a second capacitor provided in an embodiment of this application;

[0058] Figure 7E is a schematic diagram of a battery bulge structure provided in an embodiment of this application;

[0059] Figures 8A and 8B are architectural diagrams of another terminal device provided in the embodiments of this application;

[0060] Figure 9 is an architecture diagram of another terminal device provided in an embodiment of this application;

[0061] Figure 10 is an architecture diagram of another terminal device provided in an embodiment of this application;

[0062] Figure 11A is a schematic diagram of a flexible circuit board provided in an embodiment of this application;

[0063] Figure 11B is a cross-sectional view along the A1-A2 direction in Figure 11A provided in an embodiment of this application;

[0064] Figure 11C is a schematic diagram of another flexible circuit board provided in an embodiment of this application;

[0065] Figure 11D is a cross-sectional view along the B1-B2 direction in Figure 11C provided by an embodiment of this application;

[0066] Figure 12 is an equivalent structural diagram of another first capacitor and second capacitor provided in an embodiment of this application;

[0067] Figures 13A-13D are layout diagrams of a terminal device provided in an embodiment of this application;

[0068] Figure 14 is a layout diagram of another terminal device provided in an embodiment of this application;

[0069] Figures 15A and 15B are architectural diagrams of another terminal device provided in the embodiments of this application.

[0070] Reference numerals: 1-Terminal device; 20-Display module; 30-Middle frame; 40-Back cover; 50-Battery; 60-Main board; 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; FPC-Flexible circuit board; P1-First pad; P2-Second pad; P3-Third pad; P4-Fourth pad; P5-Fifth pad; L2-Second insulating layer; L3-Third insulating layer; C-Capacitor; C1-First capacitor; C2-Second capacitor; C3-Third capacitor. Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0072] 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 indicated technical features. Therefore, a feature defined with "second," "first," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0073] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" may be defined relative to the orientation in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly based on the orientation of the components in the accompanying drawings.

[0074] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "coupled connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium. The term "contact" can be direct contact or indirect contact through an intermediate medium.

[0075] In this embodiment of the application, "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0076] This application provides a terminal device, which may be a battery-powered terminal device such as a consumer electronics product or a home electronics product. Consumer electronics products include mobile phones, tablets, laptops, e-readers, personal computers (PCs), personal digital assistants (PDAs), desktop monitors, smart wearable products (e.g., smartwatches, smart bracelets, watch faces), virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, drones, and automobiles. Home electronics products include smart door locks and rechargeable small household appliances (e.g., soymilk makers, robot vacuum cleaners).

[0077] This application does not impose any special restrictions on the specific form of the terminal device described above. For ease of explanation, the following embodiments all use mobile phones as an example for illustration.

[0078] Figures 1A and 1B are architectural diagrams of a terminal device provided in an embodiment of this application.

[0079] As shown in Figure 1A, this application embodiment provides a terminal device 1, which is a terminal device including a battery. As shown in Figure 1A, the terminal device 1 mainly includes a display module 20, a middle frame 30, a back cover 40 (or battery cover, housing) and a battery 50.

[0080] The mid-frame 30 is located between the display module 20 and the rear shell 40, forming an installation space to accommodate electronic components such as the printed circuit board (PCB), battery, receiver, speaker, and camera. The PCB can integrate electronic components such as the terminal's main controller, storage unit, antenna module, and power management module, while the battery powers the display module 20, PCB, receiver, speaker, and camera.

[0081] The display module 20 has a light-emitting side from which the displayed image can be seen and a back side opposite to the light-emitting side. The rear cover 40 is located on the back side of the display module 20. The display module 20 includes an active display area (AA) and a non-display area located around the active display area. The active display area is used to display images and includes multiple sub-pixels (SP).

[0082] In one possible embodiment, the display module 20 is a liquid crystal display (LCD). Based on this, the terminal device 1 also includes a backlight unit (BLU) located behind the LCD. The backlight unit can provide a light source to the LCD, enabling each sub-pixel in the LCD to emit light for image display.

[0083] In another possible embodiment, the display module 20 is a self-emissive 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.

[0084] 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 drive controller and a motherboard. The drive controller is connected to the DDIC, which receives signals output by the drive controller and provides display signals to the display panel. The drive controller may include, for example, a system-on-chip (SOC). The drive controller may be mounted on the motherboard, for example.

[0085] In some embodiments, the display module 20 is a touch-enabled display module. The display panel included in the display module 20 is also a touch-enabled display panel. The terminal device 1 further includes a touch panel driver integrated circuit (TPIC), which is used to transmit touch signals.

[0086] In some embodiments, as shown in FIG1A, the battery 50 may be disposed between the middle frame 30 and the rear cover 40.

[0087] For example, terminal device 1 also includes a flexible printed circuit (FPC) disposed between battery 50 and rear cover 40. The flexible printed circuit FPC is coupled to the motherboard at one end and connected to devices such as speaker, microphone, and charging port of terminal device 1 at the other end.

[0088] In some other embodiments, as shown in FIG1B, the battery 50 may be disposed between the mid-frame 30 and the display module 20.

[0089] For example, the terminal device 1 also includes a flexible circuit board (FPC) disposed between the battery 50 and the mid-frame 30. The flexible circuit board (FPC) is coupled to the motherboard at one end and connected to devices such as the speaker, microphone, and charging port of the terminal device 1 at the other end.

[0090] Compared to traditional batteries such as 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. Among them, lithium-ion batteries have gradually become the mainstream lithium battery product due to their lower technological barriers, lower manufacturing costs, and ease of large-scale promotion.

[0091] Terminal devices are the most frequently used lithium-ion battery-containing devices in close proximity applications. However, lithium-ion batteries may bulge during use, significantly increasing the probability of combustion and explosion, posing a significant threat to users' life and property safety. Battery bulging and the "breathing" process are important indicators for assessing battery health. Real-time, non-destructive detection of battery bulging and breathing helps to assess battery health in real time and prevent irreversible damage to consumers and terminal devices caused by battery explosions or bulging issues. The battery breathing process can be understood as the expansion and contraction of the battery during a single charge and discharge cycle.

[0092] Figures 2A and 2B are architectural diagrams of another terminal device provided in the embodiments of this application.

[0093] In some embodiments, as shown in FIG2A, the terminal device 1 includes a battery 50, a back cover 40, a display module 20, a flexible circuit board FPC, a first electrode, and a second electrode.

[0094] For example, as shown in Figure 2A, a flexible circuit board (FPC) is disposed between the battery 50 and the back cover 40. For example, one end of the flexible circuit board (FPC) is coupled to the motherboard, and the other end is connected to devices such as speakers, microphones, and charging ports of the terminal device 1.

[0095] The first and second electrodes are positioned between the battery 50 and the rear casing 40, forming a capacitor C. When the battery 50 expands, the distance between the first and second electrodes changes, causing a change in the capacitance C, thus detecting a bulge in the battery 50.

[0096] Alternatively, as shown in Figure 2B, a flexible printed 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, forming a capacitor C. When the battery 50 expands, the distance between the first and second electrodes changes, causing a change in the capacitance C, thereby detecting a bulge in the battery 50.

[0097] Although the terminal device 1 shown in Figures 2A and 2B can monitor whether the battery 50 has expanded, it requires the use of a first electrode and a second electrode. This necessitates the introduction of two additional conductive layers into the terminal device 1, resulting in a complex structure and increased cost. Furthermore, a certain expansion space is typically required between the battery 50 and the back cover 40 or the display module 20. In the current trend towards ultra-thin designs, adding a first electrode and a second electrode, without affecting the overall thickness, inevitably leads to a reduction in the gap. This reduction in the gap, in turn, increases the overall thickness. Moreover, when the area of ​​the added first electrode and second electrode is relatively large, the capacitance C will be relatively large. This means that the existing capacitance detection circuit in the terminal device 1 will be insufficient to detect the capacitance C, requiring the addition of an additional detection circuit with greater capacitance detection capability, thus increasing cost.

[0098] Figure 3 is an architecture diagram of another terminal device provided in an embodiment of this application.

[0099] This application provides a terminal device, as shown in FIG3. The terminal device 1 includes a battery 50, a first detection electrode 71, and a flexible circuit board FPC.

[0100] 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 cover 40, or on the side of the battery 50 facing the display module 20. If the terminal device 1 also includes a mid-frame 30, the first detection electrode 71 and the battery 50 can be located on the same side of the mid-frame 30.

[0101] A flexible circuit board (FPC) and a first detection electrode 71 are disposed between the battery 50 and the first detection electrode 71. The flexible circuit board FPC can be, for example, the flexible circuit board FPC used in the terminal device 1 for connecting the speaker and the motherboard. The flexible circuit board FPC includes a second detection electrode 72, which, together with the first detection electrode 71, forms a first capacitor C1. The first capacitor C1 serves as a detection unit for detecting bulging of the battery 50. The projection of the first capacitor C1 onto the plane of the battery 50 overlaps with the battery 50. For example, the projection of the first capacitor C1 onto the plane of the battery 50 lies within the outline of the battery 50.

[0102] Figures 4A and 4B are architectural diagrams of a flexible circuit board and a first detection electrode provided in an embodiment of this application.

[0103] For example, as shown in Figure 4A, 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 disposed on the same layer. For example, the first signal line and the second detection electrode 72 are insulated from each other.

[0104] The second detection electrode 72 and the first signal line 75 are disposed on the same layer. They can be formed simultaneously and made of the same material, or they 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 surface, they are considered to be disposed on the same layer in this embodiment. For example, a flexible printed circuit board (FPC) includes a wiring layer, which includes the aforementioned second detection electrode 72 and first signal line 75.

[0105] The second detection electrode 72 and the first detection electrode 71 form a first capacitor C1. For example, in Figure 4A, the second detection electrode 72 and the first detection electrode 71 have facing portions, which 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 facing each other may, for example, not serve as the capacitor electrodes of the first capacitor C1. For example, the flexible printed circuit board (FPC) also includes a third insulating layer L3. The projections of the first detection electrode 71 and the second detection electrode 72 on the third insulating layer L3 overlap, and the overlapping portion corresponds to the first capacitor C1. The projection of the second detection electrode 72 on the third insulating layer L3 may be located within the projection of the first detection electrode 71 on the third insulating layer L3, or it may overlap with the projection of the first detection electrode 71 on the third insulating layer L3.

[0106] The embodiments of this application are not limited to the first capacitor C1 being composed of the first detection electrode 71 and the second detection electrode 72. As shown in FIG3, the portion located between the first detection electrode 71 and the second detection electrode 72 (e.g., insulating layer, air gap, etc.) can also be considered as a structural part of the first capacitor C1. The first capacitor C1 serves as a detection unit of the terminal device.

[0107] The embodiments of this application do not limit the physical positional 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 side of the battery 50 away from the user, as long as the projection of the first capacitor C1 overlaps with the battery 50, it is considered that the first capacitor C1 is located directly above the battery 50 in the embodiments of this application.

[0108] The flexible printed circuit board (FPC) also includes a first pad P1, one end of a second detection electrode 72 is coupled to the first pad P1, and the other end of the second detection electrode 72 is in a floating state. When one end of the conductive structure is not connected to any electrical component, this end is said to be in a floating state.

[0109] For example, in Figure 4A, the other end of the second detection electrode 72 is not coupled to a pad in the flexible printed circuit board (FPC). For instance, the other end of the second detection electrode 72 is recessed relative to the edge of the FPC. That is, the second detection electrode 72 does not extend along one end of the FPC to the other, 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.

[0110] The capacitance value 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 less 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, and thus reducing the capacitance value of the first capacitor C1. Therefore, the equivalent capacitance value of the detection unit, including the first capacitor C1 and the second capacitor C2 connected in series, will ultimately decrease. The smaller equivalent capacitance value can be detected using the existing capacitance detection circuit in the terminal device 1, without the need for additional detection circuitry, thus reducing costs.

[0111] For example, the other end of the second detection electrode 72 is coupled to a pad in the flexible circuit board (FPC). This pad is not coupled to a device port, meaning it is not used to connect devices. Therefore, the second detection electrode 72 is a single trace and will not produce an antenna effect, thus reducing interference to other signal lines.

[0112] The embodiments of this application do not limit the structure of the first detection electrode 71. The first detection electrode 71 can reuse the existing conductive structure in the terminal device 1, or the first detection electrode 71 can be a newly added conductive structure.

[0113] In some embodiments, the flexible printed 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 signals. The signal transmitted by the first signal line 75 can be a reference signal or other signals.

[0114] In some embodiments, as shown in FIG4A, 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 onto the second insulating layer L2 overlaps with the projection of the battery 50 onto the second insulating layer L2.

[0115] In some embodiments, as shown in FIG4B, the terminal device further includes a detection circuit 80, which is used to determine whether the battery 50 is bulging based on the detected signal.

[0116] For example, the first detection electrode 71 is used to receive a fixed voltage. The second detection electrode 72 acts as a detection electrode to provide feedback on the capacitance change of the first capacitor C1.

[0117] 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, reference ground.

[0118] The first pad P1 is used to couple with the detection circuit 80, and the second detection electrode 72 serves as the detection electrode for 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 distance between the first detection electrode 71 and the second detection electrode 72 is a first distance, and the detection circuit 80 detects a first signal. When the battery 50 is bulging, the battery 50 pushes the flexible circuit board (FPC) to deform, the FPC is lifted, and the distance between the first detection electrode 71 and the second detection electrode 72 becomes a second distance (smaller than the first distance), and the detection circuit 80 detects a 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, thus achieving monitoring of whether the battery 50 is bulging.

[0119] The detection circuit 80 obtains a first capacitance value based on a first signal and a second capacitance value based on a second signal. When the battery 50 is bulging, the distance between the first detection electrode 71 and the second detection electrode 72 decreases, and the capacitance value of the first capacitor C1 increases. If the second capacitance value is greater than the first capacitance value, the battery 50 can be determined to be bulging. Alternatively, if the second capacitance value is greater than a set value, the battery 50 can be determined to be bulging. Setting the set value greater than the first capacitance value allows for detection of the bulge only after the battery 50 has bulged to a certain extent, reducing false positives.

[0120] In the terminal device 1 provided in this application embodiment, the flexible circuit board (FPC) includes a second detection electrode 72. 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 can serve as a variable acquisition electrode. The first detection electrode 71 and the second detection electrode 72 are correspondingly arranged to form a first capacitor C1. The first detection electrode 71 and the second detection electrode 72, which are arranged opposite each other, can serve as two detection electrodes in the same detection unit. The first capacitor C1 falls within the outline of the battery 50, that is, the detection unit is correspondingly arranged with the battery 50, and the bulging of the battery 50 can be fed back to the detection unit. Therefore, by acquiring the signal of the second detection electrode 72, it is possible to detect whether the battery 50 is bulging and the breathing process of the battery 50, so that the terminal device 1 has the ability to detect the bulging of the battery 50 and the breathing process. 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. The second detection electrode 72 is integrated into the flexible circuit board (FPC), which is simple in process and easy to implement. Furthermore, no additional structures are needed, and the assembly clearance between the battery 50 and other components will not be affected, ensuring the safety of the battery 50. It will also not affect the overall thickness of the terminal device 1, contributing to a thinner and lighter design. Moreover, the second detection electrode 72 is coupled to the first pad P1. The first pad P1 on the flexible printed circuit board (FPC) allows for easy coupling of the second detection electrode 72 to the external detection circuit without requiring additional connection paths, resulting in a simple structure.

[0121] Figure 5A is an architecture diagram of another terminal device provided in the embodiments of this application; Figure 5B is a cross-sectional view along the O1-O2 direction in Figure 5A provided in the embodiments of this application; Figures 5C and 5D are architecture diagrams of another terminal device provided in the embodiments of this application.

[0122] In some embodiments, as shown in FIG5A, the flexible circuit board (FPC) includes a plurality of second detection electrodes 72, for example, the plurality of second detection electrodes 72 are spaced apart. As shown in FIG5B, the plurality of second detection electrodes 72 and the first detection electrode 71 correspond to 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.

[0123] Each second detection electrode 72 forms a first capacitor C1 with the first detection electrode 71, and the terminal device 1 includes multiple first capacitors C1. The first detection electrode 71 can be a whole-layer structure as shown in Figure 5A, or it can include multiple substructures that are spaced apart or coupled to each other, with each substructure corresponding to one of the multiple second detection electrodes 72.

[0124] In the case where 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 the bulging situation at different positions of the battery 50, which can improve the detection coverage, increase the detection accuracy and precision, and reduce the difficulty of hardware implementation.

[0125] In some embodiments, the terminal device 1 further includes at least one detection circuit 80, each detection circuit 80 being coupled to at least one first pad P1, and the detection circuit 80 being used to determine whether the battery is bulging based on the detected signal.

[0126] For example, terminal device 1 includes a first pad P1 and a detection circuit 80, the first pad P1 and the detection circuit 80 being coupled together.

[0127] Alternatively, as shown in Figure 5A, terminal device 1 includes a plurality of second detection electrodes 72 and a detection circuit 80, which can be coupled to the plurality of second detection electrodes 72. In this case, one detection circuit 80 can detect multiple detection units, thus reducing the number of detection circuits required.

[0128] Alternatively, as shown in Figure 5C, the terminal device 1 includes multiple second detection electrodes 72 and multiple detection circuits 80, with the multiple second detection electrodes 72 being coupled to the multiple detection circuits 80 respectively. 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 bulging position of the battery 50.

[0129] In some embodiments, as shown in FIG5D, 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 respectively coupled to the plurality of second detection electrodes 72.

[0130] The structure of the multiplexer 90 is not limited in this application embodiment, and the structures of multiplexers in related technologies are applicable to this application embodiment. For example, the multiplexer 90 can be disposed on the motherboard 60, and the motherboard 60 can be used to couple with multiple first pads P1 and the detection circuit 80.

[0131] Multiple second terminals of the multiplexer 90 are coupled to multiple second detection electrodes 72. For example, at any given 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. Signals on different first pads P1 can be detected at different times.

[0132] In this way, a multiplexer 90 and a detection circuit 80 can detect multiple detection units corresponding to multiple second detection electrodes 72. Moreover, the terminal device 1 does not need to set up multiple detection circuits 80, and can identify the location of different detection units based on the time-division conduction function.

[0133] Figures 6A and 6B are architectural diagrams of another terminal device provided in the embodiments of this application.

[0134] In some embodiments, as shown in FIG6A, the terminal device 1 further includes a mid-frame 30 and a rear shell 40. A battery 50 is disposed on the mid-frame 30 and located between the mid-frame 30 and the rear shell 40, and a flexible circuit board FPC and a first detection electrode 71 are disposed between the battery 50 and the rear shell 40.

[0135] For example, there is a gap between the battery 50 and the flexible circuit board (FPC). Alternatively, for example, the flexible circuit board (FPC) is disposed on the surface of the battery 50. Alternatively, for example, there is a gap between the flexible circuit board (FPC) and the rear cover 40. The aforementioned gaps can be understood as expansion space for the battery 50, and the specific size of the gaps is not limited in the embodiments of this application.

[0136] The terminal device 1 may also include a display module 20, which is disposed on the side of the middle frame 30 away from the battery 50.

[0137] The first detection electrode 71 may be, for example, a wireless charging coil or a graphite layer in the terminal device 1. The first detection electrode 71 may be coupled to a fixed voltage terminal (e.g., reference ground) on the motherboard 60. The wireless charging coil or graphite layer may be windowed and coupled to the fixed voltage terminal on the motherboard 60 via a lead or a board-to-board (BTB) connector.

[0138] The second detection electrode 72 is coupled to the detection circuit 80, which can be, for example, set on the motherboard 60. The second detection electrode 72 is coupled to the detection circuit 80 through the lines on the motherboard 60.

[0139] In some other embodiments, as shown in FIG6B, the terminal device 1 further includes a display module 20, a mid-frame 30, and a back cover 40. A battery 50 is disposed on the mid-frame 30 and is located between the mid-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.

[0140] In some embodiments, the display module includes a touch electrode, which serves as a first detection electrode 71.

[0141] In other embodiments, the display module 20 includes a backplate that serves as a first detection electrode 71.

[0142] 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. Therefore, neither of the two electrodes of the first capacitor C1 needs to be added separately. That is, the presence of the first capacitor C1 will not occupy additional thickness space of the terminal device 1, will not affect the assembly clearance between the battery 50 and other components, and will ensure battery safety. It will also not affect the overall thickness of the terminal device 1, which is beneficial for achieving a thinner and lighter design.

[0143] Figure 7A is a perspective view of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of this application. Figure 7B is an architectural diagram of a flexible circuit board, a first detection electrode, and a third detection electrode provided in an embodiment of this application. Figure 7C is an equivalent structural diagram of a first capacitor and a second capacitor provided in an embodiment of this application. Figure 7D is a circuit topology diagram of a first capacitor and a second capacitor provided in an embodiment of this application. Figure 7E is a schematic diagram of a battery bulge provided in an embodiment of this application.

[0144] In some embodiments, as shown in Figures 7A and 7B, the two 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.

[0145] The embodiments of this application are not limited to the second capacitor C2 being composed of the first detection electrode 71 and the third detection electrode 73. The portion located between the first detection electrode 71 and the third detection electrode 73 (e.g., an insulating layer, an air gap) can also be considered as a structural part of the second capacitor C2.

[0146] The third detection electrode 73 is used to couple with other networks to form a detection loop. For example, as shown in FIG7C, the aforementioned other networks are fixed voltage supply networks (which can be voltage terminals or circuit modules), and the third detection electrode 73 is coupled to the fixed voltage terminal, such as reference ground GND. The second detection electrode 72 is used as a detection electrode and is coupled to the detection circuit 80. As shown in FIG7D, 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.

[0147] According to the formula for calculating series capacitance, the equivalent capacitance of the first capacitor C1 and the second capacitor C2 connected in series in the detection unit is... c1 is the capacitance value of the first capacitor C1, and c2 is the capacitance value of the second capacitor C2. ε is a constant, S1 is the area of ​​the first detection electrode 71 and the second detection electrode 72 facing each other, d1 is the distance from the first detection electrode 71 to the second detection electrode 72, and k is an electrostatic constant. S2 is the area of ​​the first detection electrode 71 and the third detection electrode 73 facing each other, and d2 is the distance from the first detection electrode 71 to the third detection electrode 73.

[0148] As shown in Figure 7B, when battery 50 is not bulging, the distance from the first detection electrode 71 to the second detection electrode 72 is d1, and the distance from the first detection electrode 71 to the third detection electrode 73 is d2. As shown in Figure 7E, when battery 50 is bulging, the distance from the first detection electrode 71 to the second detection electrode 72 becomes d1', while the distance from the first detection electrode 71 to the third detection electrode 73 remains d2. When battery 50 is bulging, the other parameters of the first capacitor C1 and the second capacitor C2 remain unchanged or almost unchanged. Therefore, only the capacitance value c1 of the first capacitor C1 changes, while the capacitance value c2 of the second capacitor C2 remains unchanged. That is to say, throughout the entire detection process, the capacitance value c2 of the second capacitor C2 remains constant, while the capacitance value c1 of the first capacitor C1 changes, causing a change in the equivalent capacitance value c of the detection unit. Therefore, when the detection circuit 80 detects a change in capacitance value, it can be concluded that battery 50 has bulged.

[0149] This application does not limit the specific structure of the detection circuit 80. Any capacitance detection sensor already present in the terminal device 1 is applicable to this application embodiment. For example, a specific absorption rate sensor (SAR sensor), microcontroller unit (MCU), touch chip, etc., in the terminal device 1 can all be used as the detection circuit 80.

[0150] In the terminal device 1 provided in this embodiment, a first detection electrode 71 and a second detection electrode 72 are correspondingly configured to form a first capacitor C1, and a second detection electrode 71 and a third detection electrode 73 are correspondingly configured to form a second capacitor C2. The first capacitor C1 and the second capacitor C2 are connected in series through 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 in a suspended state. The second detection electrode 72 can serve as a variable acquisition electrode in the detection unit. The projection of the first capacitor C1 onto the plane where the battery 50 is located overlaps with the battery 50, that is, the first capacitor C1 is correspondingly configured with the battery 50. The bulging of the battery 50 can be fed back to the first capacitor C1, while the capacitance value of the second capacitor C2 remains unchanged. Therefore, the bulging status of the battery 50 can be directly fed back through the change in the capacitance value of the first capacitor C1. Thus, by acquiring the signal of 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 have the ability to detect the bulging and breathing process of the battery 50. Furthermore, the second capacitor C2 is connected in series with the first capacitor C1, and the signal is transmitted through the coupling between the second capacitor C2 and the first capacitor C1. This allows the first detection electrode 71 to remain in a floating state without an external voltage signal. The first detection electrode 71, aligned with the battery 50, does not need to be coupled to other networks, reducing constraints on its structure, location, and interconnection, lowering its structural complexity, and reducing the risk of damage due to interconnection, thereby reducing costs and improving its reliability. Based on this, 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. The second detection electrode 72 is integrated within the FPC, simplifying the process and making it easy to implement. Moreover, it eliminates the need for additional structures, ensuring the assembly clearance between the battery 50 and other components and guaranteeing the safety of the battery 50. It also does not affect the overall thickness of the terminal device 1, contributing to a thinner and lighter design. Furthermore, the second detection electrode 72 is coupled to the first pad P1. The second detection electrode 72 can be easily coupled to the external detection circuit by means of the first pad P1 on the flexible circuit board FPC, without the need to add an extra connection path, and the structure is simple.

[0151] In some embodiments, the third detection electrode 73 is used 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 providing other voltage values. For instance, the third detection electrode 73 is used to receive a reference ground voltage, and the third detection electrode 73 is a grounded conductive structure in the terminal device 1.

[0152] Figures 8A and 8B are architectural diagrams of another terminal device provided in the embodiments of this application.

[0153] For example, as shown in Figure 8A, the third detection electrode 73 is a protective frame in the terminal device 1. For example, the protective frame includes a motherboard protective frame, a battery protective frame, etc., and the protective frame is used to receive the reference ground voltage on the motherboard 60.

[0154] Alternatively, as shown in Figure 8A, the third detection electrode 73 is a shielding cover in the terminal device 1. This application 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 motherboard shielding cover, a small board shielding cover, etc., used to receive the reference ground voltage on the motherboard 60.

[0155] Alternatively, as shown in Figure 8B, the third detection electrode 73 is an electronic device housing in the terminal device 1. For example, the electronic device housing may include a speaker housing, etc., for receiving a reference ground voltage.

[0156] The third detection electrode 73 can reuse the existing grounding conductive structure in the terminal device 1, without the need to add an additional conductive structure. The structure is simple, the cost is low, and it will not affect the thickness of the terminal device 1.

[0157] In some embodiments, as shown in FIG8B, 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 capacitor medium of the first capacitor C1. The size of the gap is not limited in this embodiment; it can be set according to the thickness requirements of the terminal device 1.

[0158] There is a gap between the first detection electrode 71 and the flexible circuit board (FPC), so the main dielectric of the first capacitor C1 is air. The relative permittivity of air (around 1) is smaller than that of the insulating dielectric, therefore the permittivity ε of the first capacitor C1 is relatively small, and thus the capacitance value c1 of the first capacitor C1 is relatively small. The capacitance is relatively large, resulting in a smaller equivalent capacitance value c for the final detection unit. This smaller equivalent capacitance value c can be detected using the existing capacitance detection circuit in terminal device 1, eliminating the need for an additional detection circuit 80 and reducing costs.

[0159] In some embodiments, as shown in Figures 8A and 8B, the third detection electrode 73 is offset from the second detection electrode 72. Alternatively, this can be understood as the projection of the third detection electrode 73 onto the plane of the battery 50 not overlapping with the projection of the second detection electrode 72 onto the plane of the battery 50. The third detection electrode 73 may overlap with the flexible printed circuit board (FPC), but the third detection electrode 73 and the second detection electrode 72 do not overlap.

[0160] By misaligning the third detection electrode 73 with the second detection electrode 72, the formation of capacitance between the third detection electrode 73 and the second detection electrode 72 can be avoided, reducing the interference of the third detection electrode 73 on the second detection electrode 72 and improving the detection accuracy.

[0161] Figure 9 is an architecture diagram of another terminal device provided in an embodiment of this application.

[0162] In some embodiments, as shown in FIG9, the first detection electrode 71 includes an electrode body 711 and a first insulating layer 712, the first insulating layer 712 covering the electrode body 711. For example, the first insulating layer 712 wraps around the electrode body 711.

[0163] For example, the first insulating layer 712 is attached to the third detection electrode 73, and no other device structure is provided between them, nor is there a gap between them. The first insulating layer 712 and the third detection electrode 73 are in direct contact.

[0164] Alternatively, for example, the first insulating layer 712 is bonded to the third detection electrode 73.

[0165] Regardless of whether the first insulating layer 712 is bonded or attached to the third detection electrode 73, there are no other structures 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, so the capacitance 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, almost negligible, so that the equivalent capacitance c of the detection unit is almost linearly related to the capacitance c1 of the first capacitor C1, thereby improving the detection sensitivity.

[0166] For example, the first detection electrode 71 is a wireless charging coil, and the electrode body 711 is the coil body, for example, the coil body is a disc-shaped structure with metal wire winding.

[0167] 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.

[0168] In some embodiments, the capacitance value c2 of the second capacitor C2 is more than 0.5 times the capacitance value 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.

[0169] If the capacitance value of the second capacitor C2 is more than 0.5 times that of the capacitance value of the first capacitor C1, and the capacitance value remains unchanged, the influence of the second capacitor C2 on the equivalent capacitance value c of the detection unit can be almost ignored. The sensitivity of the battery bulging (or breathing process) detection depends on the capacitance change of the first capacitor C1.

[0170] Figure 10 is an architecture diagram of another terminal device provided in an embodiment of this application.

[0171] In some embodiments, as shown in FIG10, the terminal device 1 further includes a fourth detection electrode 74, which together with the third detection electrode 73 forms a third capacitor C3.

[0172] The third detection electrode 73 can be any floating conductive structure in the terminal device 1. The fourth detection electrode 74 can be used to receive a fixed voltage, and can also be floating, forming a capacitor with other networks. This application embodiment does not limit the number of capacitors included in the detection unit.

[0173] For example, the fourth detection electrode 74 is a speaker housing or other grounded conductive structure.

[0174] 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 value 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 from the third detection electrode 73 to the fourth detection electrode 74. Regardless of whether the battery 50 is bulging, the capacitance value of the third capacitor C3 remains unchanged, and the equivalent capacitance value c of the detection unit is still affected by the capacitance value c1 of the first capacitor C1.

[0175] When the third detection electrode 73 is inconvenient to couple to a fixed voltage terminal, a fourth detection electrode 74 or more conductive stages can be added to transfer the signal to the fixed voltage terminal. Both the third detection electrode 73 and the fourth detection electrode 74 can be existing conductive structures in the terminal device 1, and the signal transfer can be completed using the existing architecture of the terminal device 1 without the need to add additional device structures.

[0176] Figure 11A is a schematic diagram of a flexible circuit board provided in an embodiment of this application; Figure 11B is a cross-sectional view along A1-A2 in Figure 11A provided in an embodiment of this application.

[0177] In some embodiments, as shown in FIG11A, the flexible circuit board (FPC) further includes a shielding layer 77 located on the surface of the FPC. The shielding layer 77 includes gaps, and the projection of the second detection electrode 72 onto the shielding layer 77 falls into the gaps.

[0178] Alternatively, as shown in Figure 11B, the projection of the gap onto the third insulating layer L3 covers the projection of the second detection electrode 72 onto the third insulating layer L3. Or, the shielding layer 77 is hollowed out directly above the second detection electrode 72. The shielding layer 77 serves as a shield for the flexible printed circuit board (FPC); for example, the shielding layer 77 is a copper foil located on the surface of the FPC.

[0179] The gap is positioned corresponding to the second detection electrode 72, so that the first detection electrode 71 and the second detection electrode 72 directly face 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 the detection accuracy.

[0180] In some embodiments, as shown in FIG11B, 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 along the direction perpendicular to its extension.

[0181] The second detection electrode 72 and the first signal line 75 have the same width. On the one hand, this reduces the difficulty of patterning, and on the other hand, it reduces the area of ​​the second detection electrode 72, thereby reducing the capacitance value c1 of the first capacitor C1, and thus reducing the equivalent capacitance value c of the detection unit.

[0182] From the perspective of Figure 11A, the first detection electrode 71 can be disposed, for example, on the side of the shielding layer 77 away from the second detection electrode 72.

[0183] Figure 11C is a schematic diagram of another flexible circuit board provided in an embodiment of this application; Figure 11D is a cross-sectional view along the B1-B2 direction in Figure 11C provided in an embodiment of this application.

[0184] In some embodiments, as shown in FIG11C, the flexible circuit board FPC further includes a second signal line 76, which is disposed on the side of the second detection electrode 72 facing the first detection electrode (not shown in FIG11C), and the second signal line 76 is offset from the second detection electrode 72.

[0185] Alternatively, as shown in Figure 11D, the projection of the second signal line 76 onto the third insulating layer L3 does not overlap with the projection of the second detection electrode 72 onto the third insulating layer L3. Alternatively, it can be understood that a second wiring layer is provided on the side of the second detection electrode 72 facing the first detection electrode 71, and this 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 onto the second insulating layer L2 covers the projection of the second detection electrode 72 onto the second insulating layer L2. That is, the second wiring layer has no conductive structure above the second detection electrode 72, and there is clearance directly above the second detection electrode 72.

[0186] As shown in Figure 11C, the flexible circuit board (FPC) also includes a fourth pad P4 and a fifth pad P5, and a second signal line 76 is coupled between the fourth pad P4 and the fifth pad P5 for transmitting signals.

[0187] The second signal line 76 and the second detection electrode 72 are misaligned, which can reduce the interference of the second signal line 76 to the second detection electrode 72 and improve the detection accuracy.

[0188] Figure 12 is an equivalent structural diagram of another first capacitor and second capacitor provided in an embodiment of this application.

[0189] In some embodiments, as shown in FIG12, the flexible printed circuit board (FPC) includes a plurality of second detection electrodes 72, and the plurality of second detection electrodes 72 and the first detection electrode 72 correspondingly form a plurality of first capacitors C1. Each first capacitor C1 and each second capacitor C2 form a detection unit, and the terminal device includes a plurality of detection units. Alternatively, it can be understood that the plurality of detection units share the same second capacitor C2.

[0190] In some embodiments, the terminal device includes at least one detection circuit 80, each detection circuit 80 being coupled to at least one second detection electrode 72.

[0191] Figures 13A-13D are layout diagrams of a terminal device provided in an embodiment of this application.

[0192] In some embodiments, as shown in FIG13A, the terminal device 1 includes a second detection electrode. Therefore, the terminal device 1 includes a detection unit and a detection circuit 80.

[0193] In some other embodiments, as shown in FIG13B, the terminal device 1 includes a plurality of second detection electrodes. Therefore, the terminal device 1 includes a plurality of detection units and a detection circuit 80.

[0194] In some other embodiments, as shown in FIG13C, the terminal device 1 includes a plurality of second detection electrodes. Therefore, the terminal device 1 includes a plurality of detection units and a plurality of detection circuits 80 correspondingly coupled together.

[0195] In some embodiments, as shown in FIG13D, the terminal device 1 includes a plurality of second detection electrodes. Therefore, the terminal device 1 includes a plurality of 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 a plurality of second terminals of the multiplexer 90 are respectively coupled to a plurality of second detection electrodes 72.

[0196] The detection unit in terminal device 1 can be the detection unit including the first capacitor C1 as described above, or the detection unit can be the detection unit including the first capacitor C1 and the second capacitor C2 connected in series. This application embodiment does not limit this. When terminal device 1 includes multiple detection units, the structures of the multiple detection units can be the same or different.

[0197] Figure 14 is a layout diagram of another terminal device provided in an embodiment of this application.

[0198] In some embodiments, as shown in FIG14, the terminal device 1 includes a plurality of the above-described flexible circuit boards (FPCs).

[0199] In multiple flexible printed circuit boards (FPCs), the second detection electrode 72 can form a first capacitor C1 with the same first detection electrode 71, or it can form a first capacitor C1 with different first detection electrodes 71. The detection unit containing multiple second detection electrodes 72 can be coupled to the same detection circuit 80, or it can be coupled to different detection circuits 80. Alternatively, the detection unit containing multiple second detection electrodes 72 can be coupled to the same or different multiplexers 90.

[0200] Figures 15A and 15B are architectural diagrams of another terminal device provided in the embodiments of this application.

[0201] Based on any of the above structures, in the first implementation, as shown in FIG15A, the terminal device 1 further includes a middle frame 30 and a rear shell 40. The battery 50 is disposed on the middle frame 30 and is located between the middle frame 30 and the rear shell 40. The flexible circuit board FPC and the first detection electrode 71 are disposed between the battery 50 and the rear shell 40.

[0202] For example, there is a gap between the battery 50 and the flexible circuit board (FPC). Alternatively, for example, the flexible circuit board (FPC) is disposed on the surface of the battery 50. Alternatively, for example, there is a gap between the flexible circuit board (FPC) and the rear cover 40. The aforementioned gaps can be understood as expansion space for the battery 50, and the specific size of the gaps is not limited in the embodiments of this application.

[0203] In some embodiments, the first detection electrode 71 includes a wireless charging coil.

[0204] The terminal device 1 includes a wireless charging coil in a suspended state. This wireless charging coil can be reused as the first detection electrode 71 of the detection unit, eliminating the need for an additional electrode for the first capacitor C1. That is, the presence of the first capacitor C1 does not occupy additional thickness space in the terminal device 1, does not 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, contributing to a thinner and lighter design. Furthermore, using the wireless charging coil as a suspended capacitor electrode eliminates the need for external signal connection via BTB connectors or similar methods, reducing costs.

[0205] In some embodiments, the first detection electrode 71 includes a graphite layer. Since the terminal device 1 includes a suspended graphite layer, this graphite layer can be reused as the first detection electrode 71 of the detection unit, eliminating the need for an additional electrode for the first capacitor C1. That is, the presence of the first capacitor C1 does not additionally occupy the 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 beneficial for achieving a thinner and lighter design. Furthermore, using the graphite layer as a suspended capacitor electrode eliminates the need for processes such as windowing to externally connect the graphite layer to the signal, reducing damage to the graphite layer and improving its reliability.

[0206] In the second implementation, as shown in Figure 15B, the terminal device 1 further includes a display module 20, with a flexible circuit board (FPC) and a first detection electrode 71 disposed between the battery 50 and the display module 20.

[0207] Compared with the first implementation, the location of the flexible circuit board (FPC) in the terminal device 1 changes in the second implementation. Other structures can be the same as in the first implementation, and will not be described in detail here.

[0208] The first detection electrode 71 can be any conductive structure of the terminal device 1 disposed on the side of the flexible circuit board (FPC) away from the battery 50, and the first detection electrode 71 is in a suspended state. For example, the first detection electrode 71 can be a graphite layer or a metal heat sink.

[0209] The structure of the second capacitor C2 can be any of the above-mentioned methods. Figures 15A and 15B are only schematic diagrams and are not limited in any way.

[0210] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A terminal device (1), characterized in that, The terminal device (1) includes: Battery (50); The first detection electrode (71) is disposed on one side of the battery (50), and both ends of the first detection electrode (71) are suspended. A flexible printed circuit board (FPC) is disposed between the battery (50) and the first detection electrode (71); the flexible printed 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 disposed on 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 circuit board (FPC) further includes a second signal line (76), which is disposed between the second detection electrode (72) and the first detection electrode (71); the second signal line (76) is offset from the second detection electrode (72).

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

4. The terminal device (1) according to any one of claims 1-3, 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 1-4, 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 1-5, characterized in that, The flexible circuit board (FPC) further includes a shielding layer (77) 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 1-6, 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 the reference ground.

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

10. The terminal device (1) according to any one of claims 1-9, characterized in that, The terminal device (1) further includes a fourth detection electrode (74), which forms a third capacitor (C3) with the third detection electrode (73).

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

12. The terminal device (1) according to any one of claims 1-11, characterized in that, The flexible circuit board (FPC) includes a plurality of second detection electrodes (72), and the plurality of second detection electrodes (72) and the first detection electrode (71) respectively form a plurality of first capacitors (C1).

13. The terminal device (1) according to any one of claims 1-12, characterized in that, The terminal device (1) further includes at least one detection circuit (80); Each of the detection circuits (80) is coupled to at least one of the second detection electrodes (72), and the detection circuits (80) are used to determine whether the battery (50) is bulging based on the 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 terminal of the multiplexer (90) is coupled to the detection circuit (80), and the multiple second terminals of the multiplexer (90) are coupled one-to-one with the multiple second detection electrodes (72); 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 1-14, characterized in that, The terminal device (1) also includes a back cover (40), and the flexible circuit board (FPC) and the first detection electrode (71) are disposed between the battery (50) and the back cover (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 includes a coil body and a first insulating layer (712), 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 includes a graphite body and a first insulating layer (712), 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 1-16, characterized in that, The terminal device (1) further includes a display module (20), and the flexible circuit board (FPC) and the first detection electrode (71) are disposed between the battery (50) and the display module (20).

20. A terminal device (1), characterized in that, The terminal device (1) includes: Battery (50); The first detection electrode (71) is disposed on one side of the battery (50); A flexible printed circuit board (FPC) is disposed between the battery (50) and the first detection electrode (71). The FPC includes a first 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 disposed on the same layer. The second insulating layer (L2) is disposed on the side of the second detection electrode (72) facing the first detection electrode (71) and covers the second detection electrode (72). 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) and the first detection electrode (71) form a capacitor. 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 circuit board (FPC) includes a plurality of second detection electrodes (72), and the plurality of second detection electrodes (72) and the first detection electrode (71) respectively form a plurality of 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 of the detection circuits (80) is coupled to at least one of the second detection electrodes (72), and the detection circuits (80) are used to determine whether the battery (50) is bulging based on the detected signal.

23. The terminal device (1) according to claim 21, characterized in that, The flexible printed circuit board (FPC) also 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 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 20-23, characterized in that, The terminal device (1) also includes a back cover (40), and the flexible circuit board (FPC) and the first detection electrode (71) are disposed between the battery (50) and the back cover (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 20-23, characterized in that, The terminal device (1) further includes a display module (20), the flexible circuit board (FPC) and the first detection electrode (71) are disposed between the battery (50) and the display module (20); the display module (20) includes a back plate, the back plate serving as the first detection electrode (71).

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