Battery and terminal device

Abstract

This application provides a battery and a terminal device. The battery includes a cell, a battery protection board, and a panel. The battery protection board includes an extension. A contact detection part is provided at one end of the extension. The contact detection part is spaced apart from the panel. The contact detection part is electrically connected to the control terminal of a battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the contact detection part contacts the panel. Therefore, the battery and terminal device provided by this application can realize the charge / discharge protection function of the battery when the cell expansion is large, thereby improving the safety of the battery and the terminal device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery and a terminal device. Background Technology

[0002] Terminal devices typically require batteries for power. To accommodate the miniaturization of these devices, the energy density (ED) of batteries needs to be continuously improved. However, as battery energy density increases, the expansion of battery cells during charging and discharging becomes more pronounced. If the expansion of battery cells within a terminal device exceeds the internal allowance for expansion and charging cannot be stopped in time, it can lead to a decrease in the safety of the terminal device and pose a safety hazard. Summary of the Invention

[0003] In view of the above problems, this application provides a battery and a terminal device.

[0004] In a first aspect, this application provides a battery, which includes a battery cell, a battery protection board, and a panel. The battery protection board includes a circuit board body and an extension. One end of the extension is provided with a contact detection part, and the other end of the extension is electrically connected to the circuit board body. A battery charge / discharge switch is provided on the circuit board body, and the battery charge / discharge switch includes a control terminal. The panel, the extension, and the battery cell are stacked sequentially along a first direction, where the first direction is the thickness direction of the battery cell. The contact detection part is spaced apart from the panel and is electrically connected to the control terminal of the battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the contact detection part contacts the panel.

[0005] In conjunction with the first aspect, in one possible implementation, along the second direction, the extension is located between one-third and two-thirds of the length of the cell in the second direction, which is perpendicular to the first direction.

[0006] In conjunction with the first aspect, in one possible implementation, the battery further includes a first elastic adhesive and a second elastic adhesive. One side of each of the first and second elastic adhesives is bonded to the first surface of the battery cell, and the other side of each is bonded to the panel. Along the second direction, the first elastic adhesive, the extension segment, and the second elastic adhesive are sequentially arranged on the first surface, and when viewed along the first direction, the extension segment, the first elastic adhesive, and the second elastic adhesive do not overlap on the first surface, which is the surface of the battery cell facing the panel.

[0007] In conjunction with the first aspect, in one possible implementation, the thickness of the contact detection part is less than the thickness of the first elastic adhesive and the second elastic adhesive.

[0008] In conjunction with the first aspect, in one possible implementation, the thickness of the first elastic adhesive and the second elastic adhesive is 0.15mm-0.25mm, and the thickness of the extension is 0.08mm-0.17mm.

[0009] In conjunction with the first aspect, in one possible implementation, the battery cell is housed in a casing, the casing including a bottom wall, and the panel, battery cell, and bottom wall are sequentially stacked along a first direction. The battery also includes a first elastic adhesive and a second elastic adhesive, one side of which is adhered to the second surface of the battery cell, and the other side of which is adhered to the bottom wall. A contact detection unit is disposed on the surface of the battery cell facing the panel. Along a second direction, the first elastic adhesive and the second elastic adhesive are sequentially arranged on the second surface, which is the surface of the battery cell facing the bottom wall.

[0010] In conjunction with the first aspect, in one possible implementation, the thickness of the first elastic adhesive and the second elastic adhesive is 0.1mm-0.15mm.

[0011] In conjunction with the first aspect, in one possible implementation, the panel is a metal panel, and the contact detection unit includes a first conductive area and a second conductive area, both of which are exposed facing the panel. The first conductive area is electrically connected to the control terminal of the battery charge / discharge switch, and the second conductive area is grounded. The first and second conductive areas have different polarities. The battery charge / discharge switch is configured to disconnect when the first and second conductive areas make electrical contact with the panel.

[0012] In conjunction with the first aspect, in one possible implementation, the contact detection unit further includes a body region, wherein the first conductive region and the second conductive region are both recessed relative to the body region along a first direction, the recess depth of the first conductive region and / or the second conductive region is 0.01-0.05 mm, the length of the first conductive region and / or the second conductive region in a second direction is 1.5-3 mm, and the length of each first conductive region and / or the second conductive region in a third direction is 1.5-3 mm, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0013] In conjunction with the first aspect, in one possible implementation, the contact detection unit includes a piezoelectric sensor, the output of which is electrically connected to the control terminal of a battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the piezoelectric sensor contacts the panel.

[0014] In conjunction with the first aspect, in one possible implementation, the piezoelectric sensor includes a sensing region and a body region. The sensing region is recessed relative to the body region along a first direction, the recess depth of the sensing region is 0.01-0.05 mm, the length of the sensing region in a second direction is 1.5-3 mm, and the length of the sensing region in a third direction is 1.5-3 mm.

[0015] Secondly, this application provides a terminal device, which includes a battery and a housing. The battery includes a battery cell and a battery protection board. The battery protection board includes a circuit board body and an extension. One end of the extension is provided with a contact detection part, and the other end of the extension is electrically connected to the circuit board body. A battery charge / discharge switch is provided on the circuit board body, and the battery charge / discharge switch includes a control terminal. The housing includes a bottom wall and multiple side walls, which together form a hollow receiving groove in which the battery is housed. Along a first direction, the battery cell, the extension, and the bottom wall are stacked sequentially. A groove is recessed on the bottom wall along the first direction. When viewed along the first direction, the extension is located within the groove. The first direction is the thickness direction of the battery cell. The contact detection part is spaced apart from the bottom surface of the groove. The contact detection part is electrically connected to the control terminal of the battery charge / discharge switch, and the battery charge / discharge switch is configured to disconnect when the contact detection part contacts the bottom surface of the groove.

[0016] In conjunction with the second aspect, in one possible implementation, along the second direction, the extension is located between one-third and two-thirds of the length of the cell in the second direction, which is perpendicular to the first direction.

[0017] In conjunction with the second aspect, in one possible implementation, the battery further includes a first elastic adhesive and a second elastic adhesive. One side of each of the first and second elastic adhesives is bonded to the second surface of the battery cell, and the other side of each is bonded to the bottom walls on either side of the groove. Along the second direction, the first elastic adhesive, the extension segment, and the second elastic adhesive are sequentially arranged on the second surface. When viewed along the first direction, the extension segment, the first elastic adhesive, and the second elastic adhesive do not overlap on the first surface, which is the surface of the battery cell facing the bottom wall.

[0018] In conjunction with the second aspect, in one possible implementation, the thickness of the first elastic adhesive and the second elastic adhesive is 0.1mm-0.15mm.

[0019] In conjunction with the second aspect, in one possible implementation, the recess depth of the groove is 0.05-0.1 mm.

[0020] In conjunction with the second aspect, in one possible implementation, the housing is a metal housing, and the contact detection unit includes a first conductive region and a second conductive region. Both the first and second conductive regions are exposed facing the bottom wall. The first conductive region is electrically connected to the control terminal of the battery charge / discharge switch, and the second conductive region is grounded. The first and second conductive regions have different polarities. The battery charge / discharge switch is configured to disconnect when the first and second conductive regions make electrical contact with the bottom surface of the groove.

[0021] In conjunction with the second aspect, in one possible implementation, the contact detection unit further includes a body region, wherein the first conductive region and the second conductive region are both recessed relative to the body region along the fourth direction, the recess depth of the first conductive region and / or the second conductive region is 0.01-0.05 mm, the length of the first conductive region and / or the second conductive region in the second direction is 1.5-3 mm, the length of the first conductive region and / or the second conductive region in the third direction is 1.5-3 mm, the first direction, the second direction and the third direction are perpendicular to each other, and the fourth direction is the opposite direction of the first direction.

[0022] In conjunction with the second aspect, in one possible implementation, the contact detection unit includes a piezoelectric sensor, the output of which is electrically connected to the control terminal of a battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the piezoelectric sensor contacts the bottom surface of the groove.

[0023] In conjunction with the second aspect, in one possible implementation, the piezoelectric sensor includes a sensing region and a body region. The sensing region is recessed relative to the body region along a first direction, with a recess depth of 0.01-0.05 mm. The length of the sensing region in a second direction is 1.5-3 mm, and the length of the sensing region in a third direction is 1.5-3 mm.

[0024] In the first aspect, this application provides an extension section on the battery protection board and a contact detection part at one end of the extension section. When the battery cell expands during charging and discharging, the extension section and the contact detection part move closer to the panel. Therefore, when the battery cell expands significantly during charging and discharging, the contact detection part contacts the panel, thereby controlling the battery charging and discharging switch to open, and thus cutting off the charging and discharging circuit. This achieves the charging and discharging protection function for the battery when the battery cell expands significantly, improving the safety of the battery and terminal equipment.

[0025] In the second aspect, this application provides an extension section on the battery protection board and a contact detection unit at one end of the extension section. When the battery cell expands during charging and discharging, the extension section and the contact detection unit move closer to the bottom wall of the terminal device's casing. Therefore, when the battery cell expands significantly during charging and discharging, the contact detection unit contacts the panel, thereby controlling the battery charging and discharging switch to open and cutting off the charging and discharging circuit. This achieves the charging and discharging protection function for the battery when the battery cell expands significantly, improving the safety of the battery and the terminal device. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a terminal device provided in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of a battery provided in one embodiment of this application.

[0028] Figure 3 for Figure 2 The structural diagram of the battery along the Z-direction.

[0029] Figure 4 This is a schematic diagram of a battery provided in one embodiment of this application.

[0030] Figure 5 This is a schematic diagram of a terminal device provided in an embodiment of this application.

[0031] Figure 6 This is a schematic diagram of a contact detection unit provided in an embodiment of this application.

[0032] Figure 7 A circuit diagram of a circuit board body provided in one embodiment of this application.

[0033] Figure 8 This is a schematic diagram of a contact detection unit provided in an embodiment of this application.

[0034] Figure 9 A circuit diagram of a circuit board body provided in one embodiment of this application.

[0035] Figure 10 A circuit diagram of a circuit board body provided in one embodiment of this application.

[0036] Figure 11 A circuit diagram of a circuit board body provided in another embodiment of this application.

[0037] Figure 12 A circuit diagram of a circuit board body provided in another embodiment of this application.

[0038] Figure 13 A circuit diagram of a circuit board body provided in another embodiment of this application. Detailed Implementation

[0039] The technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings.

[0040] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, A can be directly connected to C, and C can be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connects to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0041] In the description of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0042] In the description of this application, the words "first," "second," etc., are used only to distinguish different objects and do not limit the quantity or order of execution, nor do they imply that they must be different. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of a terminal device 10 provided in an embodiment of this application.

[0044] The terminal device 10 includes a housing 11 and a battery 13. The housing 11 includes a receiving groove 12. The battery 13 includes a battery cell 131, a battery protection board 132, and a panel 134. The receiving groove 12 is recessed along a first direction (i.e., the Z direction). The Z direction is the thickness direction of the housing 11, which is also the thickness direction of the battery cell 131.

[0045] The battery protection board 132 is electrically connected to the battery cell 131 and the connector 133. Both the battery cell 131 and the battery protection board 132 are housed within a receiving groove 12. The connector 133 extends from one side of the receiving groove 12. The panel 134 is detachably fixed to the housing 11. The panel 134 covers and seals the opening side of the receiving groove 12. The battery protection board 132 protects the battery cell 131, providing charge and discharge protection. The connector 133 connects to the motherboard of the terminal device 10, allowing the battery cell 131 to supply power to the terminal device 10 via the battery protection board 132 and the connector 133, or for the mobile terminal 10 to charge the battery cell 131 via the connector 133 and the battery protection board 132.

[0046] Thus, since the panel 134 covers and closes the opening side of the groove 114, the integration and aesthetics of the terminal device 10 can be improved. At the same time, since the battery 13 is housed in the groove 114 and the panel 134 is detachably fixed to the housing 11, the battery 13 can be detachably installed in the terminal device 10, facilitating flexible replacement, maintenance, and fault detection of the battery 13.

[0047] In some embodiments, the housing 11 may be the lower cover of the terminal device 10, and the lower cover is the side facing away from the display surface of the terminal device 10. The panel 134 may be detachably fixed to the housing 11 by means of fasteners, such as screws, pins, clips, keys, etc.

[0048] Please see Figure 2 , Figure 2 This is a schematic diagram of a battery 13 provided in an embodiment of this application.

[0049] The battery protection board 132 includes a circuit board body 1321 and an extension 1322. A contact detection unit 1323 is provided at one end of the extension 1322. The other end of the extension 1322 is electrically connected to the circuit board body 1321. A battery charge / discharge switch is provided on the circuit board body 1321. The battery charge / discharge switch includes a control terminal. The contact detection unit 1323 is used to detect whether the extension 1322 is in contact with other structures. If contact occurs, the contact detection unit 1323 generates a contact signal and outputs it to the control terminal of the battery charge / discharge switch through the extension 1322. Thus, when the extension 1322 is in contact with other structures, the signal parameters of the control terminal of the battery charge / discharge switch, such as voltage, current, and level values, may change, thereby changing the conduction state and operating mode of the battery charge / discharge switch, thus achieving contact detection between the extension 1322 and other structures.

[0050] In some embodiments, the extension 1322 may be a flexible printed circuit board (FPC).

[0051] In some embodiments, the battery charge / discharge switch includes a charging switch and a discharging switch. Both the charging switch and the discharging switch are MOSFETs, and correspondingly, the control terminals of the charging switch and the discharging switch are their respective gates. In other embodiments, the charging switch and the discharging switch can be other controlled switches, and the corresponding control terminals of the charging switch and the discharging switch can be determined according to the actual situation, which will not be elaborated here.

[0052] The battery 13 also includes a first elastic adhesive member 135 and a second elastic adhesive member 136. Along the width direction of the cell 131, the first elastic adhesive member 135 and the second elastic adhesive member 136 are symmetrically spaced apart with respect to the width centerline of the cell 131, and one end of each is bonded to the first surface of the cell 131. The first surface is the surface of the cell 131 facing the panel 134. The Z-direction is also the thickness direction of the cell 131.

[0053] In some embodiments, the first elastic adhesive member 135 and the second elastic adhesive member 136 may be arranged symmetrically or asymmetrically in the second direction of the battery cell 131. The second direction is perpendicular to the first direction (i.e., the Z direction), for example, the second direction can be the X direction or the Y direction, i.e., the width direction or the length direction of the battery cell 131. This application does not limit the specific direction of the second direction. That is, when viewed along the first direction, the first elastic adhesive member 135 and the second elastic adhesive member 136 do not overlap on the first surface.

[0054] In some embodiments, the first elastic adhesive 135 and the second elastic adhesive 136 may be double-sided adhesive.

[0055] Please see Figure 3 , Figure 3 for Figure 2 Structural diagram of the middle battery 13 along the Z direction.

[0056] The housing 11 includes a bottom wall 111 and multiple side walls 112. The bottom wall 111 and the multiple side walls 112 enclose a hollow receiving groove 12. Along the Z direction, the panel 134, the extension section 1322, the battery cell 131, and the bottom wall 111 are stacked sequentially. The panel 134 and the extension section 1322 are spaced apart. One end of the first elastic adhesive member 135 and the second elastic adhesive member 136 are both bonded to the first surface of the battery cell 131, and the other end of the first elastic adhesive member 135 and the second elastic adhesive member 136 are both bonded to the panel 134.

[0057] The extension segment 1322 is disposed on the first surface and is located between the first elastic adhesive member 135 and the second elastic adhesive member 136. That is, along the second direction, the first elastic adhesive member 135, the extension segment 1322, and the second elastic adhesive member 136 are arranged sequentially on the first surface, and when viewed along the first direction, the first elastic adhesive member 135, the extension segment 1322, and the second elastic adhesive member 136 do not overlap on the first surface.

[0058] The thickness of the contact detection unit 1323 is less than the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state, so as to avoid accidental contact between the contact detection unit 1323 and the panel 134 in their natural state.

[0059] In this embodiment, the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state is 0.15mm-0.25mm. The thickness of the extension section 1322 can be set to 0.08mm-0.17mm. The thickness in the natural state refers to the thickness when neither compressed nor stretched. When the battery cell 131 does not expand along the Z direction, the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 is the thickness in their natural state. When the battery cell 131 expands along the Z direction, it compresses the first elastic adhesive 135 and the second elastic adhesive 136 along the Z direction, causing the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 to be less than their thickness in their natural state. Since the thickness of the contact detection part 1323 is less than the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state, when the battery cell 131 does not expand along the Z direction, the contact detection part 1323 and the panel 134 are spaced apart, and the contact detection part 1323 will not contact the panel 134.

[0060] Based on the structure of the battery 13 described above, when the cell 131 expands during charging and discharging, it will extend and expand in the Z direction. Since the first elastic adhesive 135 and the second elastic adhesive 136 are elastic and compressible, and the panel 134 is fixedly connected to the housing 11, the cell 131, relative to the surface of the panel 134 (i.e., the first surface), will press against the first elastic adhesive 135 and the second elastic adhesive 136, simultaneously causing the contact detection unit 1323 to move closer to the panel 134. When the expansion is significant, the contact detection unit 1323 contacts the panel 134, thereby outputting a contact signal to the control terminal of the battery charging / discharging switch. When the control terminal of the battery charging / discharging switch receives the contact signal, the corresponding charging / discharging switch is disconnected; that is, the battery charging / discharging switch is configured to disconnect when the contact detection unit 1323 contacts the panel 134. At this time, the charging and discharging circuit of battery 13 is cut off, realizing the charging and discharging protection function of battery 13 when the cell 131 expands to a large extent, thereby improving the safety of battery 13 and terminal device 10.

[0061] In some embodiments, along the second direction, the extension segment 1322 is located between one-third and two-thirds of the length of the cell 131 in the second direction. Taking the second direction as the X direction as an example, that is, the extension segment 1322 is located between one-third and two-thirds of the length of the cell 131 in the X direction. That is, L2 is the length of the cell 131 in the X direction, L1 is the distance between the extension segment 1322 and one side of the cell 131 in the X direction, and 1 / 3×L2≤L1≤2 / 3×L2. Since the degree of expansion of the battery 13 during charging and discharging varies depending on the position of the cell 131 surface, and the position with a larger and more obvious expansion in the Z direction is approximately the center region of the cell 131 relative to the surface of the panel 134, or away from the surface of the panel 134, providing the contact detection part 1323 in the center region of the cell 131 relative to the surface of the panel 134 can improve the detection accuracy of the cell 131 expansion. Here, the central region can be defined as the area enclosed by one-third to two-thirds of the length of the cell 131 in the X direction.

[0062] Please see Figure 4 , Figure 4 This is a schematic diagram of a battery 13a provided in an embodiment of this application.

[0063] The battery 13a provided in this embodiment and Figure 2 , 3The difference in the battery 13 is that, in this embodiment, one end of both the first elastic adhesive 135 and the second elastic adhesive 136 is bonded to the second surface of the cell 131. That is, along the second direction, the first elastic adhesive 135 and the second elastic adhesive 136 are arranged sequentially on the second surface, while the other end of both the first elastic adhesive 135 and the second elastic adhesive 136 is bonded to the bottom wall 111. The second surface is the surface of the cell 131 facing the bottom wall 111. The extension segment 1322 is disposed on the surface of the cell 131 facing the panel 134, that is, on the first surface.

[0064] In this embodiment, the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state is 0.1mm-0.15mm. Since the first elastic adhesive 135, the second elastic adhesive 136, and the extension section 1322 are disposed on different surfaces of the battery cell 131, the thickness of the larger of the extension section 1322 and the contact detection part 1323 does not need to be less than the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state; only the extension section 1322 needs to be spaced apart from the panel 134. Compared to... Figure 2 , 3 The thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in the battery 13 in the natural state can be set to be lower in the battery 13a provided in this embodiment. This can reduce the amount of the first elastic adhesive 135 and the second elastic adhesive 136 used and the manufacturing cost, improve the miniaturization of the battery, and save the space occupied by the battery.

[0065] Please see Figure 5 , Figure 5 This is a schematic diagram of a terminal device 10a provided in an embodiment of this application.

[0066] The terminal device 10a provided in this embodiment and Figure 1The difference in the terminal device 10 is that, in this embodiment, the bottom wall 111 of the housing 11 is recessed along the Z direction with a groove 114. Viewed along the Z direction, the extension 1322 is at least partially located within the groove 114, and the bottom wall 111 and the extension 1322 are spaced apart. The contact detection unit 1323 is spaced apart from the bottom surface 113 of the groove 114. A first elastic adhesive 135 and a second elastic adhesive 136 are symmetrically spaced on both sides outside the groove 114, and one end of each is bonded to the second surface of the battery cell 131, while the other ends are bonded to the bottom walls 111 on both sides outside the groove 114. The second surface is the surface of the battery cell 131 that is opposite to the bottom wall 111. An extension segment 1322 is disposed on the second surface and is located between the first elastic adhesive member 135 and the second elastic adhesive member 136. The extension segment 1322 is spaced apart from the first elastic adhesive member 135. The extension segment 1322 is spaced apart from the second elastic adhesive member 136.

[0067] Based on the structure of the terminal device 10a described above, when the battery cell 131 expands during charging and discharging, it will extend and expand in the Z direction. Since the first elastic adhesive 135 and the second elastic adhesive 136 are elastic and compressible, the surface of the battery cell 131 relative to the bottom wall 111 will press against the first elastic adhesive 135 and the second elastic adhesive 136, simultaneously causing the extension section 1322 and the contact detection section 1323 to move towards the bottom surface 113 of the groove 114. When the expansion is significant, the contact detection section 1323 contacts the bottom surface 113 of the groove 114, thereby outputting a contact signal to the control terminal of the battery charging and discharging switch. When the control terminal of the battery charging and discharging switch receives the contact signal, the corresponding charging and discharging switch is disconnected, thereby cutting off the charging and discharging circuit. This achieves the charging and discharging protection function for the battery 13 and / or battery 13a when the battery cell 131 expands significantly, improving the safety of the battery 13 and / or battery 13a and the terminal device 10a.

[0068] In this embodiment, the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state is 0.1mm-0.15mm. Since the first elastic adhesive 135 and the second elastic adhesive 136 are bonded to the portion of the bottom wall 111 outside the groove 114, and the extension section 1322 and the contact detection section 1323 are spaced apart relative to the groove 114, the thickness of the larger of the two sections, 1322 and 1323, does not need to be less than the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state; only the extension section 1322 needs to be spaced apart from the bottom surface 113 of the groove 114. Therefore, the thickness of the first elastic adhesive 135 and the second elastic adhesive 136 in their natural state in the terminal device 10a provided in this embodiment can be set lower, thereby reducing the amount of the first elastic adhesive 135 and the second elastic adhesive 136 used and the manufacturing cost, improving battery miniaturization, and saving battery space.

[0069] In some embodiments, the recess depth of the groove 114 can be set to 0.05-0.1 mm. In this way, there is a certain safe distance between the contact detection unit 1323 and the bottom surface 113 of the groove 114, making it difficult for the contact detection unit 1323 to contact the bottom surface 113 of the groove 114, thereby improving the safety of the battery 13 and / or battery 13a and terminal device 10a.

[0070] Please see Figure 6 , Figure 6 This is a schematic diagram of a contact detection unit 1324 provided in an embodiment of this application.

[0071] The contact detection unit 1324 includes a body region, a first conductive region 1323a, and a second conductive region 1323b. The first conductive region 1323a and the second conductive region 1323b are exposed facing the panel 134. The first conductive region 1323a is electrically connected to the control terminal of the battery charge / discharge switch, and at least the second conductive region 1323b is grounded. The polarity of each first conductive region 1323a is different from that of each second conductive region 1323b.

[0072] When the contact detection unit 1324 is Figures 1 to 4 When the contact detection unit 1323 is in the middle, Figures 1 to 4 Panel 134 is a metal panel. When the contact detection unit 1324 is... Figure 5 When the contact detection unit 1323 is in the middle, Figure 5 The shell 11 is a metal shell, that is, the bottom surface 113 of the groove 114 is metal.

[0073] Based on the structure of the contact detection unit 1324 and the surface in contact with it, when the battery cell 131 expands during charging and discharging, the contact detection unit 1324 moves towards the contact surface. Here, for Figures 1 to 4 For the provided batteries 13 and / or 13a, the contact surface is a metal panel 134. Figure 5 In the provided terminal device 10a, the contact surface is the bottom surface 113 of a metal groove 114. When the expansion is significant, the contact detection unit 1324 contacts the contact surface. At this time, the first conductive region 1323a and the second conductive region 1323b are electrically connected through the contact surface, grounding the first conductive region 1323a, and the contact detection unit 1324 outputs a contact signal to the control terminal of the battery charge / discharge switch. Here, the contact signal is a low-level grounded signal. At this time, the control terminal level of the battery charge / discharge switch becomes low, thereby causing the battery charge / discharge switch to disconnect. That is, for application scenarios where the contact surface is a metal panel 134, the battery charge / discharge switch is configured to disconnect when the first conductive area 1323a and the second conductive area 1323b make electrical contact with the metal panel 134. For application scenarios where the contact surface is the bottom surface 113 of the groove 114, the battery charge / discharge switch is configured to disconnect when the first conductive area 1323a and the second conductive area 1323b make electrical contact with the bottom surface 113 of the groove 114, thereby cutting off the charge / discharge circuit of the three batteries 13 and / or battery 13a, realizing the charge / discharge protection function of battery 13 and / or battery 13a when the cell 131 expands to a large extent, and improving the safety of battery 13 and / or battery 13a and terminal device 10.

[0074] In some embodiments, the first conductive region 1323a and the second conductive region 1323b are both recessed relative to the body region along the thickness direction of the extension 1322. That is, for Figures 1 to 4 For the provided battery 13 or battery 13a, the thickness direction of the extension 1322 is the Z direction. Figure 5 In the provided terminal device 10a, the thickness direction of the extension 1322 is opposite to the Z direction. The recess depth of each first conductive region 1323a and / or second conductive region 1323b is 0.01-0.05mm. Therefore, when the contact detection unit 1324 contacts the contact surface, it indicates that the battery 13 and / or battery 13a has significantly expanded during charging and discharging. This reduces the possibility of design errors in the distance between the contact detection unit 1324 and the contact surface, preventing the contact detection unit 1324 from easily contacting the contact surface even when the cell 131 has not expanded significantly or has almost no expansion, thus reducing the probability of misjudgment and improving the detection accuracy of the contact detection unit 1324.

[0075] In some embodiments, the length L3 of each first conductive region 1323a and / or second conductive region 1323b in the second direction is 1.5-3 mm, and the length L4 of each first conductive region 1323a and / or second conductive region 1323b in the third direction is 1.5-3 mm. The first direction, second direction, and third direction are perpendicular to each other. Taking the second direction as the X direction and the third direction as the Y direction as an example, the X direction is the width direction of the cell 131, and the Y direction is the length direction of the cell 131. Therefore, the length, width, and area of ​​each first conductive region 1323a and / or second conductive region 1323b are reasonably set, allowing for sufficient contact with the contact surface when the battery 13 and / or battery 13a has a large expansion degree, while also reducing the probability of accidental contact with the contact surface when the cell 131 has a small expansion degree, thus improving the detection accuracy of the contact detection unit 1324.

[0076] Please see Figure 7 , Figure 7 The circuit diagram is provided for a circuit board body 1321 according to an embodiment of this application.

[0077] The circuit board body 1321 includes a control circuit U1 and charge / discharge switches. The charge / discharge switches include a charging switch M2 and a discharging switch M1. The control circuit U1 outputs control signals to the control terminals of the charging and discharging switches M2 and M1 to control their on / off states. When the charging and discharging switches M2 and M1 are on, the battery cell 131 can charge and discharge normally. When the control circuit U1 detects overcurrent, overvoltage, or overtemperature conditions in the battery cell 131 during charging and discharging, it controls the charging and discharging switches M2 and M1 to disconnect, thereby protecting the battery cell 131.

[0078] When the contact detection unit 1323 is Figure 6 When the contact detection unit 1324 is in place, the second conductive region 1323b is connected to the ground terminal of the circuit board body 1321 to ground. The first conductive region 1323a is electrically connected to the control terminal of the charge / discharge switch. For example, when there is one first conductive region 1323a, it is electrically connected to the control terminal of the charging switch M2 or the control terminal of the discharging switch M1. As another example, when there are two first conductive regions 1323a, they are electrically connected to the control terminals of the charging switch M2 and the discharging switch M1, respectively. Here, we will explain using the example of two first conductive regions 1323a being electrically connected to the control terminals of the charging switch M2 and the discharging switch M1, respectively.

[0079] When cell 131 expands significantly during charging and discharging, the first conductive region 1323a and the second conductive region 1323b are electrically connected through contact surfaces, allowing the first conductive region 1323a to be grounded through the second conductive region 1323b. At this time, the control terminals of charging switch M2 and discharging switch M1 both receive low-level signals, causing charging switch M2 and discharging switch M1 to open, cutting off the battery's charging and discharging circuit. This achieves the charging and discharging protection function for battery 13 and / or 13a when cell 131 expands significantly, improving the safety of battery 13 and / or battery 13a and terminal device 10 and / or terminal device 10a.

[0080] Please see Figure 8 , Figure 8 This is a schematic diagram of a contact detection unit 1325 provided in an embodiment of this application.

[0081] The contact detection unit 1325 provided in this embodiment and Figure 6 The difference between the contact detection unit 1324 and the one provided in this embodiment is that the contact detection unit 1325 includes a piezoelectric sensor 1324a. The output terminal of the piezoelectric sensor 1324a is electrically connected to the control terminal of the battery charge / discharge switch.

[0082] When the contact detection unit 1325 is Figures 1 to 4 When the contact detection unit 1323 is in the middle, Figures 1 to 4 Panel 134 does not need to be a metal panel. When the contact detection unit 1325 is Figure 5 When the contact detection unit 1323 is in the middle, Figure 5 The housing 11 in the groove does not need to be a metal housing, that is, the bottom surface 113 of the groove 114 does not need to be metal.

[0083] Based on the structure of the contact detection unit 1325 and the surface in contact with it, when the battery cell 131 expands during charging and discharging, the contact detection unit 1325 moves towards the contact surface. Here, for Figures 1 to 4 For the provided battery 13 or battery 13a, the contact surface is panel 134. Figure 5In the provided terminal device 10a, the contact surface is the bottom surface 113 of the groove 114. When the expansion degree is large, the contact detection unit 1325 contacts the contact surface. At this time, the piezoelectric sensor 1324a responds to the contact pressure applied thereon and outputs a contact signal to the control terminal of the battery charge / discharge switch. This causes the battery charge / discharge switch to open. That is, in the application scenario where the contact surface is the panel 134, the battery charge / discharge switch is configured to open when the piezoelectric sensor 1324a contacts the panel 134, and in the application scenario where the contact surface is the bottom surface 113 of the groove 114, the battery charge / discharge switch is configured to open when the piezoelectric sensor 1324a contacts the bottom surface 113 of the groove 114, thereby cutting off the charge / discharge circuit of the battery 13 and / or the battery 13a, realizing the charge / discharge protection function of the battery 13 and / or the battery 13a when the cell 131 expands to a large degree, and improving the safety of the battery 13 and / or the battery 13a and the terminal device 10 and / or the terminal device 10a.

[0084] In some embodiments, the piezoelectric sensor 1324a includes a body region and a sensing region 1325a. The sensing region 1325a is recessed relative to the body region along the thickness direction of the extension 1322. That is, for Figures 1 to 4 For the provided battery 13 or battery 13a, the thickness direction of the extension 1322 is the Z direction. Figure 5 In the provided terminal device 10a, the thickness direction of the extension 1322 is opposite to the Z-direction. The recess depth of the sensing area 1325a is 0.01-0.05mm. Therefore, when the contact detection unit 1325 contacts the contact surface, it indicates that the battery cell 131 has significantly expanded during charging and discharging. This reduces the possibility of design errors in the distance between the contact detection unit 1325 and the contact surface, preventing the contact detection unit 1325 from easily contacting the contact surface even when the battery cell 131 has not expanded significantly or has almost no expansion, thus reducing the probability of misjudgment and improving the detection accuracy of the contact detection unit 1325.

[0085] In some embodiments, the length of the sensing area 1325a in the X direction is 1.5-3 mm, and the length of the sensing area 1325a in the Y direction is 1.5-3 mm. Therefore, the length, width, and area of ​​the sensing area 1325a are reasonably set, allowing it to fully contact the contact surface when the battery cell 131 has a large degree of expansion, while also reducing the probability of accidental contact when the battery cell 131 has a small degree of expansion, thus improving the detection accuracy of the contact detection unit 1325.

[0086] Please see Figure 9 , Figure 9 A circuit diagram of a circuit board body 1321a provided in an embodiment of this application.

[0087] The circuit board body 1321a provided in this embodiment and Figure 7 The difference between the circuit board body 1321 and the circuit board body 1321 is that when the contact detection unit 1323 is... Figure 8 When the contact detection unit 1325 is in operation, the control terminals of the charging switch M2 and the discharging switch M1 are electrically connected to the output terminal of the voltage comparator U2, and the input terminal of the voltage comparator U2 is electrically connected to the output terminal of the piezoelectric sensor 1324a.

[0088] When the battery cell 131 expands significantly during charging and discharging, the piezoelectric sensor 1324a comes into contact with the contact surface. Since the output voltage of the piezoelectric sensor 1324a increases with the applied contact pressure, its output voltage also gradually increases as the battery cell 131 expands during charging and discharging. The voltage comparator U2 compares the received output voltage of the piezoelectric sensor 1324a with a preset voltage threshold. When the output voltage of the piezoelectric sensor 1324a exceeds the preset voltage threshold, the voltage comparator U2 outputs a low-level signal, indicating that the expansion of the battery cell 131 during charging and discharging has exceeded the preset expansion level. At this time, the control terminals of charging switch M2 and discharging switch M1 both receive a low-level signal output from voltage comparator U2, thereby causing charging switch M2 and discharging switch M1 to open, cutting off the charging and discharging circuit of the battery, realizing the charging and discharging protection function of battery 13 and / or battery 13a when the cell 131 expands to a large extent, and improving the safety of battery 13 and / or battery 13a and terminal equipment 10 and / or 10a.

[0089] Please see Figure 10 , Figure 10 A circuit diagram of a circuit board body 1321b provided in an embodiment of this application.

[0090] The circuit board body 1321b provided in this embodiment and Figure 7 The difference between the circuit board body 1321 and the circuit board body 1321b is that the circuit board body 1321b includes two control circuits U1 and two pairs of charge / discharge switches. One pair of charge / discharge switches includes a charging switch M2 and a discharging switch M1 controlled by one of the control circuits U1, and the other pair of charge / discharge switches includes a charging switch M2 and a discharging switch M1 controlled by the other control circuit U1. Figure 10 As shown, the current detection terminals Is of both control circuits U1 are electrically connected to one end of the detection resistor Rs. The electrical connections between the two control circuits U1 and other electronic components are as follows: Figure 7The electrical connections of the control circuit U1 with other electronic components are the same and will not be described again here. Thus, the circuit board body 1321b includes two control circuits U1 and two pairs of charge / discharge switches, which can form dual protection. When one of the control circuits U1 fails, the remaining control circuits U1 can still protect the cell module 131 normally, improving the safety of the battery 13 and / or battery 13a and terminal device 10 and / or 10a.

[0091] Correspondingly, the battery protection board 132 may include two extension sections 1322, each of which is provided with a contact detection section 1324. The first conductive area 1323a in each contact detection section 1324 is electrically connected to the control terminal of the charging switch M2 or the discharging switch M1. The second conductive area 1323b in each contact detection section 1324 is electrically connected to the ground terminal of the circuit board body 1321b for grounding.

[0092] Please see Figure 11 , Figure 11 A circuit diagram of a circuit board body 1321c provided in an embodiment of this application.

[0093] The circuit board body 1321c provided in this embodiment and Figure 10 The difference between the circuit board body 1321b and the circuit board body 1321c is that in the circuit board body 1321c, the control terminal of each pair of charge / discharge switches is electrically connected to the output terminal of a voltage comparator U2. The input terminal of each voltage comparator U2 is electrically connected to a piezoelectric sensor 1324a. Thus, when the contact detection unit 1323 is... Figure 8 When the contact detection unit 1325 is in use, the piezoelectric sensor 1324a and voltage comparator U2 can achieve charge and discharge protection for battery 13 and / or battery 13a when the cell 131 expands significantly. For details, please refer to [reference needed]. Figure 9 The relevant explanations will not be repeated here.

[0094] Please see Figure 12 , Figure 12 A circuit diagram of a circuit board body 1321d provided in an embodiment of this application.

[0095] The circuit board body 1321d includes a metering chip U4, a secondary protection chip U5, a fuse F, a discharge switch M1, a charging switch M2, a first connector P1, a second connector P2, and a detection resistor Rs.

[0096] The metering chip U4 may include a control output terminal, a communication terminal, a cell detection terminal, a first circuit detection terminal, and a second circuit detection terminal. The control output terminal is electrically connected to the control terminals of the discharge switch M1 and the charging switch M2, used to output control signals to control the on / off state of the discharge switch M1 and the charging switch M2. The communication terminal is electrically connected to the first connector P1 and communicates with other external devices, such as the host of a Battery Management System (BMS), through the first connector P1 to establish and communicate with other external devices. The cell detection terminal is electrically connected to the cell 131. When the cell 131 is a cell module composed of multiple individual cells, the number of cell detection terminals can be set according to the number of individual cells, so that the metering chip U4 can obtain the parameters of each individual cell, such as voltage and current, more accurately through the cell detection terminals. The first end of the detection resistor Rs is electrically connected to the first end of the cell 131 and the first circuit detection terminal of the metering chip U4, and the second end of the detection resistor Rs is electrically connected to the second connector P2 and the second circuit detection terminal of the metering chip U4. Thus, the metering chip U4 can obtain the current in one end of the circuit of the battery cell 131 through its first circuit detection terminal and second circuit detection terminal. The metering chip U4 can output control signals according to the current in one end of the circuit of the battery cell 131 and / or the parameters of each individual battery cell to control the discharge switch M1 and the charging switch M2 to disconnect, thereby protecting the battery cell 131.

[0097] The secondary protection chip U5 includes a detection terminal and a control terminal. The detection terminal of the secondary protection chip U5 is electrically connected to the second terminal of the battery cell 131, which is the other end of the first terminal of the battery cell 131. The control terminal of the secondary protection chip U5 is electrically connected to the fuse F. The fuse F is also electrically connected between the second terminal of the battery cell 131 and the discharge switch M2. The secondary protection chip U5 can obtain the parameters of the battery cell 131 through the detection terminal and control the fuse F to blow according to the parameters of the battery cell 131, thereby protecting the battery cell 131. In this way, the metering chip U4 and the secondary protection chip U5 can also form dual protection, improving the safety of battery 13 and / or battery 13a and terminal equipment 10 and / or 10a.

[0098] When the contact detection unit 1323 is Figure 6When the contact detection unit 1324 is in place, the second conductive region 1323b is connected to the first end of the battery cell 131. The first conductive region 1323a is electrically connected to the control terminal of the charge / discharge switch. For example, when there is one first conductive region 1323a, it is electrically connected to the control terminal of the charging switch M2 or the control terminal of the discharging switch M1. As another example, when there are two first conductive regions 1323a, they are respectively electrically connected to the control terminals of the charging switch M2 and the discharging switch M1. Taking the example of two first conductive regions 1323a being electrically connected to the control terminals of the charging switch M2 and the discharging switch M1, the first conductive region 1323a and the second conductive region 1323b can achieve charge / discharge protection for the battery 13 and / or battery 13a when the battery cell 131 has a large degree of expansion. For detailed explanation, please refer to... Figure 7 The relevant explanations will not be repeated here.

[0099] Please see Figure 13 , Figure 13 A circuit diagram of a circuit board body 1321e provided in an embodiment of this application.

[0100] The circuit board body 1321e provided in this embodiment and Figure 12 The difference between the circuit board body 1321d and the circuit board body 1321e is that in the circuit board body 1321e, the control terminals of the charging switch M2 and the discharging switch M1 are both electrically connected to the output terminal of a voltage comparator U2. The input terminals of the voltage comparator U2 are both electrically connected to the piezoelectric sensor 1324a. Thus, when the contact detection unit 1323 is... Figure 8 When the contact detection unit 1325 is in use, the piezoelectric sensor 1324a and voltage comparator U2 can achieve charge and discharge protection for battery 13 and / or battery 13a when the cell 131 expands significantly. For details, please refer to [reference needed]. Figure 9 The relevant explanations will not be repeated here.

[0101] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A battery, characterized in that, The battery includes a cell, a battery protection board, and a panel. The battery protection board includes a circuit board body and an extension. One end of the extension is provided with a contact detection part, and the other end of the extension is electrically connected to the circuit board body. The circuit board body is provided with a battery charge / discharge switch, and the battery charge / discharge switch includes a control terminal. Along a first direction, the panel, the extension section, and the battery cell are stacked sequentially, where the first direction is the thickness direction of the battery cell; The contact detection unit is spaced apart from the panel, and the contact detection unit is electrically connected to the control terminal of the battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the contact detection unit contacts the panel.

2. The battery as described in claim 1, characterized in that, Along the second direction, the extension is located between one-third and two-thirds of the length of the cell in the second direction, which is perpendicular to the first direction.

3. The battery as described in claim 1, characterized in that, The battery further includes a first elastic adhesive and a second elastic adhesive. One side of the first elastic adhesive and the second elastic adhesive are both bonded to the first surface of the battery cell, and the other side of the first elastic adhesive and the second elastic adhesive are both bonded to the panel. Along the second direction, the first elastic adhesive, the extension segment, and the second elastic adhesive are arranged sequentially on the first surface, and when viewed along the first direction, the extension segment, the first elastic adhesive, and the second elastic adhesive do not overlap on the first surface, which is the surface of the battery cell facing the panel.

4. The battery as described in claim 3, characterized in that, The thickness of the contact detection part is less than the thickness of the first elastic adhesive and the second elastic adhesive.

5. The battery as described in claim 4, characterized in that, The thickness of the first elastic adhesive and the second elastic adhesive is 0.15mm-0.25mm, and the thickness of the extension section is 0.08mm-0.17mm.

6. The battery as claimed in claim 1, characterized in that, The battery cell is housed in a housing, the housing including a bottom wall, and the panel, the battery cell, and the bottom wall are stacked sequentially along the first direction; The battery further includes a first elastic adhesive and a second elastic adhesive. One side of the first elastic adhesive and the second elastic adhesive are both bonded to the second surface of the battery cell, and the other side of the first elastic adhesive and the second elastic adhesive are both bonded to the bottom wall. The contact detection part is disposed on the surface of the battery cell facing the panel. Along the second direction, the first elastic adhesive and the second elastic adhesive are arranged sequentially on the second surface, which is the surface of the battery cell facing the bottom wall.

7. The battery as described in claim 6, characterized in that, The thickness of the first elastic adhesive and the second elastic adhesive is 0.1mm-0.15mm.

8. The battery as claimed in any one of claims 1 to 7, characterized in that, The panel is a metal panel, and the contact detection part includes a first conductive area and a second conductive area. Both the first conductive area and the second conductive area are exposed facing the panel. The first conductive area is electrically connected to the control terminal of the battery charge and discharge switch, and the second conductive area is grounded. The polarities of the first conductive area and the second conductive area are different. The battery charge / discharge switch is configured to disconnect when the first conductive area and the second conductive area are in electrical contact with the panel.

9. The battery as claimed in claim 8, characterized in that, The contact detection unit further includes a body region. The first conductive region and the second conductive region are both recessed relative to the body region along the first direction. The recess depth of the first conductive region and / or the second conductive region is 0.01-0.05 mm. The length of the first conductive region and / or the second conductive region in the second direction is 1.5-3 mm. The length of each first conductive region and / or the second conductive region in the third direction is 1.5-3 mm. The first direction, the second direction and the third direction are perpendicular to each other.

10. The battery as claimed in any one of claims 1 to 7, characterized in that, The contact detection unit includes a piezoelectric sensor, and the output terminal of the piezoelectric sensor is electrically connected to the control terminal of the battery charge / discharge switch; The battery charge / discharge switch is configured to disconnect when the piezoelectric sensor comes into contact with the panel.

11. The battery as claimed in claim 10, characterized in that, The piezoelectric sensor includes a sensing area and a body area. The sensing area is recessed relative to the body area along the first direction. The recess depth of the sensing area is 0.01-0.05 mm. The length of the sensing area in the second direction is 1.5-3 mm. The length of the sensing area in the third direction is 1.5-3 mm.

12. A terminal device, characterized in that, The terminal device includes a battery and a housing. The battery includes a cell and a battery protection board. The battery protection board includes a circuit board body and an extension. One end of the extension is provided with a contact detection part, and the other end of the extension is electrically connected to the circuit board body. The circuit board body is provided with a battery charge / discharge switch, and the battery charge / discharge switch includes a control terminal. The housing includes a bottom wall and multiple side walls, which together form a hollow receiving groove, in which the battery is housed. Along the first direction, the battery cell, the extension section, and the bottom wall are stacked sequentially. A groove is recessed on the bottom wall along the first direction. When viewed along the first direction, the extension section is located in the groove. The first direction is the thickness direction of the battery cell. The contact detection unit is spaced apart from the bottom surface of the groove. The contact detection unit is electrically connected to the control terminal of the battery charge / discharge switch. The battery charge / discharge switch is configured to disconnect when the contact detection unit contacts the bottom surface of the groove.

13. The terminal device as described in claim 12, characterized in that, Along the second direction, the extension is located between one-third and two-thirds of the length of the cell in the second direction, which is perpendicular to the first direction.

14. The terminal device as described in claim 12, characterized in that, The battery also includes a first elastic adhesive and a second elastic adhesive. One side of the first elastic adhesive and the second elastic adhesive are both bonded to the second surface of the battery cell, and the other side of the first elastic adhesive and the second elastic adhesive are respectively bonded to the bottom wall on both sides of the groove. Along the second direction, the first elastic adhesive, the extension segment, and the second elastic adhesive are arranged sequentially on the second surface, and when viewed along the first direction, the extension segment, the first elastic adhesive, and the second elastic adhesive do not overlap on the first surface, which is the surface of the battery cell facing the bottom wall.

15. The terminal device as described in claim 14, characterized in that, The thickness of the first elastic adhesive and the second elastic adhesive is 0.1mm-0.15mm.

16. The terminal device as described in claim 14, characterized in that, The groove has a depth of 0.05-0.1 mm.

17. The terminal device as described in any one of claims 12 to 16, characterized in that, The housing is a metal housing. The contact detection part includes a first conductive area and a second conductive area. Both the first conductive area and the second conductive area are exposed facing the bottom wall. The first conductive area is electrically connected to the control terminal of the battery charge and discharge switch. The second conductive area is grounded. The polarities of the first conductive area and the second conductive area are different. The battery charge / discharge switch is configured to disconnect when the first conductive region and the second conductive region make electrical contact with the bottom surface of the groove.

18. The terminal device as described in claim 17, characterized in that, The contact detection unit further includes a body region. The first conductive region and the second conductive region are both recessed relative to the body region along a fourth direction. The recess depth of the first conductive region and / or the second conductive region is 0.01-0.05 mm. The length of the first conductive region and / or the second conductive region in the second direction is 1.5-3 mm. The length of the first conductive region and / or the second conductive region in the third direction is 1.5-3 mm. The first direction, the second direction, and the third direction are perpendicular to each other. The fourth direction is the opposite direction of the first direction.

19. The terminal device as described in any one of claims 12 to 16, characterized in that, The contact detection unit includes a piezoelectric sensor, and the output terminal of the piezoelectric sensor is electrically connected to the control terminal of the battery charge / discharge switch; The battery charge / discharge switch is configured to disconnect when the piezoelectric sensor contacts the bottom surface of the groove.

20. The terminal device as described in claim 19, characterized in that, The piezoelectric sensor includes a sensing area and a body area. The sensing area is recessed relative to the body area along the first direction. The recess depth of the sensing area is 0.01-0.05 mm. The length of the sensing area in the second direction is 1.5-3 mm. The length of the sensing area in the third direction is 1.5-3 mm.

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