WO2023124224A1 - 柔性电路板及电子设备 - Google Patents

柔性电路板及电子设备 Download PDF

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Publication number
WO2023124224A1
WO2023124224A1 PCT/CN2022/117912 CN2022117912W WO2023124224A1 WO 2023124224 A1 WO2023124224 A1 WO 2023124224A1 CN 2022117912 W CN2022117912 W CN 2022117912W WO 2023124224 A1 WO2023124224 A1 WO 2023124224A1
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WO
WIPO (PCT)
Prior art keywords
flexible unit
connection
flexible
positioning
connecting portion
Prior art date
Application number
PCT/CN2022/117912
Other languages
English (en)
French (fr)
Other versions
WO2023124224A9 (zh
Inventor
周亚伟
罗凡
Original Assignee
荣耀终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Priority to US18/004,165 priority Critical patent/US20240243498A1/en
Priority to EP22823305.2A priority patent/EP4228380A4/en
Publication of WO2023124224A1 publication Critical patent/WO2023124224A1/zh
Publication of WO2023124224A9 publication Critical patent/WO2023124224A9/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/147—Structural association of two or more printed circuits at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/61—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/613—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to flexible printed circuits, flat or ribbon cables or like structures by means of interconnecting elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits
    • H05K3/363—Assembling flexible printed circuits with other printed circuits by soldering
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
    • H05K2201/10954—Other details of electrical connections
    • H05K2201/10977—Encapsulated connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/16—Inspection; Monitoring; Aligning
    • H05K2203/167—Using mechanical means for positioning, alignment or registration, e.g. using rod-in-hole alignment

Definitions

  • the present application relates to the technical field of communications, and in particular to a flexible circuit board and electronic equipment.
  • Flexible printed circuit is widely used in electronic devices such as mobile phones and tablets due to its advantages of softness, free bending and folding, and thin thickness.
  • the FPC in existing electronic equipment is generally of an integrated structure (integrated molding).
  • the size is large, the preparation is difficult, and the preparation cost is high; and the FPCs of different electronic devices have different sizes, and the FPCs cannot be reused.
  • the present application provides a flexible circuit board and electronic equipment.
  • the preparation difficulty can be reduced, and the preparation cost can be saved.
  • the embodiment of the present application provides a flexible circuit board, the flexible circuit board includes: a first flexible unit and a second flexible unit; the first flexible unit includes a first connection part and a plurality of first wirings, each The first wiring includes welding points located at the first connection part; each welding point is provided with a first connection structure, and the welding points are electrically connected to the first connection structure; the second flexible unit includes a first surface and a second surface, The first surface is located on the side of the second flexible unit away from the first flexible unit; the second flexible unit also includes a second connection part and a plurality of second wirings; a plurality of through holes are opened on the second connection part, and the plurality of through holes The holes are provided in one-to-one correspondence with multiple second wirings; a second connection structure is provided around the side wall of each through hole, and the second connection structure extends to the first surface and the second surface, and is electrically connected to the second wiring. Connection: the first connection structure passes through the through hole and is electrically connected with the second connection structure,
  • the flexible circuit board provided in the embodiment of the present application is formed by combining at least two flexible units. Since the size of the flexible unit is smaller than that of a flexible circuit board with an integrated structure, it reduces the difficulty of preparation, saves the cost of preparation, and improves the efficiency of preparation; and when preparing multiple flexible units with smaller sizes on a large board, it is beneficial Typesetting, compared to preparing multiple flexible circuit boards with an integrated structure on a large board of the same size, improves the utilization rate of the large board (the proportion of the actually used large board in the entire large board), and avoids large boards. waste and cost savings. In addition, it is conducive to the reuse of flexible units.
  • first connection part and the second connection part can be electrically connected through the electrical connection between the first connection structure and the second connection structure, and the structure is simple.
  • the first connection structure includes a first connection subsection, an intermediate subsection and a second connection subsection connected in sequence; the first connection subsection is located between the first flexible unit and the second flexible unit, And it is electrically connected with the second connection structure located on the second surface, the middle subsection is located in the through hole, is in contact with and electrically connected with the second connection structure located in the through hole, the second connection subsection protrudes from the first surface, and is in contact with the second connection structure located in the through hole.
  • the second connection structure located on the first surface is electrically connected. That is, the contact area between the first connection structure and the second connection structure increases, which can better electrically connect the first connection structure and the second connection structure, ensuring that the first wiring of the first flexible unit and the first wiring of the second flexible unit The electrical connection of the two traces.
  • first connection structure and the second connection structure are electrically connected by welding.
  • first connection structure and the second connection structure are electrically connected by laser welding. It should be noted that the first connection structure and the second connection structure are electrically connected by welding including but not limited to laser welding.
  • the thickness of the first connection subsection is H1, wherein H1 is greater than or equal to 0.02mm , and less than or equal to 0.04mm; the thickness of the second connection subsection is H2, wherein H2 is greater than or equal to 0.03mm and less than or equal to 0.05mm; the first direction is the direction in which the first connection part points to the second connection part.
  • the flexible circuit board further includes an adhesive layer; the adhesive layer is located between the first connecting portion and the second connecting portion.
  • the adhesive layer can pre-fix the first flexible unit and the second flexible unit, preventing the first flexible unit and the second flexible unit from being welded (for example, There is movement during laser welding).
  • the setting of the adhesive layer can make the first flexible unit and the second flexible unit firmly fixed together, avoiding the flexible circuit board
  • the stress is all integrated on the first connection structure, causing the first connection structure to separate from the welding point, and/or, the first connection structure is separated from the second connection structure, affecting the first flexible unit and
  • the electrical connection of the second flexible unit further affects the transmission of signals.
  • the adhesive layer is disposed around the plurality of first connection structures.
  • the advantage of this arrangement is that the adhesive layer can fix the first flexible unit and the second flexible unit in all directions, avoiding the movement of the first flexible unit and the second flexible unit, and preventing the first flexible unit and the second flexible unit from moving. separate.
  • the first positioning structure is provided on the first connecting part; the second positioning structure is provided on the second connecting part; the orthographic projection of the first positioning structure and the second positioning structure on the first connecting part are the same or complementary in shape.
  • the setting of the first positioning structure and the second positioning structure can improve the efficiency and accuracy of positioning when the first flexible unit and the second flexible unit are aligned.
  • the first positioning structure is provided on the first connecting part; on the basis of the second positioning structure being provided on the second connecting part, the shortest distance from the first positioning structure to the first connecting structure is W1, wherein W1 is greater than 0.5mm; the shortest distance from the second positioning structure to the through hole is W2, wherein W2 is greater than 0.5mm. That is, the first positioning structure is farther away from the first connection structure, and the second positioning structure is farther away from the through hole. In this way, the influence on the original structure during the formation of the first positioning structure and the second positioning structure can be avoided.
  • a first positioning structure is provided on the first connection part; a second positioning structure is provided on the second connection part, the first positioning structure includes a positioning column; The second positioning structure includes a positioning hole.
  • the first positioning structure and the second positioning structure are simple in structure, do not occupy too much area of the first connecting part and the second connecting part, and the forming process is simple, which improves the manufacturing efficiency.
  • the second positioning structure includes a positioning hole
  • the shortest distance from the positioning hole to the edge of the second connecting part is W3, wherein W3 is greater than 0.5mm .
  • the shape of the positioning column includes a cylinder, a cone or a truncated cone; along the first direction, The shape of the positioning hole matches the shape of the positioning post; the first direction is a direction in which the first connecting portion points to the second connecting portion.
  • the shape of the positioning post includes a cone or a truncated cone, alignment efficiency can be improved.
  • a first positioning structure is provided on the above-mentioned first connecting part; on the basis of a second positioning structure being provided on the second connecting part, the first positioning structure includes a positioning column, and the second positioning structure includes The positioning groove; the second flexible unit also includes a side surface connecting the first surface and the second surface; the positioning groove runs through the first surface and the second surface, and the opening of the positioning groove is located on the side surface. Since the positioning groove is located at the edge of the second connecting part, there is no need to set more areas in the second connecting part to open the positioning groove, so the size of the second connecting part can be reduced, thereby reducing the size of the second flexible unit.
  • both the first surface and the second surface include second wiring; and along the first direction, the second wiring on the first surface overlaps the second wiring on the second surface;
  • the first direction is a direction in which the first connecting portion points to the second connecting portion. In this way, the design area of the second flexible unit is reduced.
  • the flexible circuit board further includes an insulating layer; the side of the second connecting portion away from the first connecting portion is provided with an insulating layer.
  • the arrangement of the insulating layer can prevent the second connection subsection from short-circuiting with other metal structures in the electronic device.
  • an embodiment of the present application provides an electronic device, including any one of the above flexible circuit boards. All the effects of the above-mentioned flexible circuit board can be realized.
  • the electronic device further includes a battery and a battery compartment for accommodating the battery; a receiving groove is provided on a side of the battery compartment close to the flexible circuit board; the receiving groove is used to accommodate the first connecting part and the second connecting part, which can Completely avoiding the overlapping of the first connecting portion and the second connecting portion leads to an increase in the thickness of the whole machine.
  • the shortest distance from the edge of the accommodating groove to the side wall of the battery compartment is W4, wherein W4 is greater than or equal to 4mm. That is, the accommodating groove is far away from the edge of the battery. In this way, the edge of the battery can be prevented from causing stress concentration on the edge of the accommodating groove, resulting in deformation of the edge of the battery, which in turn leads to a short circuit between the positive and negative electrodes of the battery, resulting in battery safety issues.
  • the electronic device further includes a support structure; the support structure is located on a side of the first connection part away from the second connection part.
  • the setting of the support structure can ensure the flatness of the welding between the first flexible unit and the second flexible unit, and avoid unevenness leading to poor welding.
  • the electronic device further includes a heat insulation structure; the heat insulation structure is located on a side of the first connection part away from the second connection part.
  • the display panel is protected by the heat insulation structure to prevent the display panel from being damaged by high temperature during the welding process.
  • FIG. 1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
  • FIG. 2 is a three-dimensional exploded schematic diagram of the electronic device shown in FIG. 1;
  • FIG. 3 is a schematic structural diagram of an FPC provided in an embodiment of the present application.
  • Fig. 4 is the sectional view of Fig. 3 along AA ' direction;
  • Fig. 5 is a schematic structural view of a first flexible unit in Fig. 3;
  • Fig. 6 is a partial enlarged view of the QQ area in Fig. 5;
  • Fig. 7 is a schematic structural diagram of a second flexible unit in Fig. 3;
  • Fig. 8 is the sectional view of Fig. 7 along BB ' direction;
  • Fig. 9 is a schematic structural diagram of a first flexible unit provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a process for preparing FPC provided in an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a process for preparing FPC provided in an embodiment of the present application.
  • Figure 12 is a schematic diagram of a process for preparing FPC provided in the embodiment of the present application.
  • Figure 13 is a schematic diagram of a process for preparing FPC provided by the related art
  • Fig. 14 is the sectional view of Fig. 3 along CC ' direction;
  • Fig. 15 is a schematic structural diagram of another FPC provided by the embodiment of the present application.
  • Fig. 16 is a schematic structural diagram of another first flexible unit provided by the embodiment of the present application.
  • Fig. 17 is a schematic structural diagram of another FPC provided by the embodiment of the present application.
  • Fig. 18 is a schematic structural diagram of a display panel and a middle frame provided by an embodiment of the present application.
  • Fig. 19 is a sectional view of Fig. 18 along DD' direction;
  • FIG. 20 is a schematic structural diagram of a display panel and an FPC provided by an embodiment of the present application.
  • Fig. 21 is a sectional view of Fig. 20 along EE' direction.
  • 10-display panel 20-back cover; 30-middle frame; 40-button; 50-main board; 60-battery; 70-FPC; 80-battery compartment;
  • first and second in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of objects.
  • first target object, the second target object, etc. are used to distinguish different target objects, rather than describing a specific order of the target objects.
  • words such as “exemplary” or “for example” are used as examples, illustrations or illustrations. Any embodiment or design scheme described as “exemplary” or “for example” in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as “exemplary” or “such as” is intended to present related concepts in a concrete manner.
  • multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.
  • the embodiment of the present application provides an electronic device.
  • the electronic device provided in the embodiment of the present application may be a mobile phone, a computer, a tablet computer, a personal digital assistant (PDA for short), a vehicle-mounted computer, a TV, a smart wearable device, a smart Electronic equipment including flexible printed circuit (FPC) such as household equipment.
  • PDA personal digital assistant
  • FPC flexible printed circuit
  • the embodiment of the present application does not specifically limit the specific form of the foregoing electronic device.
  • the electronic device is a mobile phone as an example for description below.
  • the positional relationship of each structure in the mobile phone is specified in the X-axis direction, the Y-axis direction and the Z-axis direction.
  • the X-axis direction is the width direction of the mobile phone
  • the Y-axis direction is the length direction of the mobile phone
  • the Z-axis direction (also called the first direction) is the thickness direction of the mobile phone.
  • a mobile phone 100 includes a display panel 10 , a rear cover 20 , a middle frame 30 , and buttons 40 .
  • the display panel 10 and the rear cover 20 are disposed opposite to each other, and the middle frame 30 is located between the display panel 10 and the rear cover 20 .
  • the display panel 10 , the middle frame 30 and the rear cover 20 may enclose an accommodating cavity. 2 structures such as a mainboard 50, a battery 60, at least one FPC 70, a battery compartment 80 for accommodating the battery 60, and a camera (front camera and/or rear camera) are arranged in the housing cavity.
  • the display panel 10 includes, for example, a liquid crystal display (Liquid Crystal Display, LCD) panel, an organic light emitting diode (Organic Light Emitting Diode, OLED) display panel, an LED display panel, etc., wherein the LED display panel includes, for example, a Micro-LED display panel, a Mini- LED display panel, etc.
  • LCD Liquid Crystal Display
  • OLED Organic Light Emitting Diode
  • LED display panel includes, for example, a Micro-LED display panel, a Mini- LED display panel, etc.
  • the embodiment of the present application does not limit the type of the display panel 10 .
  • the material of the back cover 20 may include, for example, opaque materials such as plastic, plain leather, and glass fiber; or may include light-transmitting materials such as glass.
  • the embodiment of the present application does not limit the material of the rear cover 20 .
  • Buttons 40 are arranged on the middle frame 30 .
  • the key 40 may be a volume key for adjusting the volume, or a power key for waking up and turning off the screen, which is not specifically limited in this embodiment of the present application.
  • the display panel 10 may be electrically connected to the main board 50 through the FPC 70, for example.
  • FIG. 2 only uses the FPC 70 connecting the display panel 10 and the main board 50 as an example, but it does not constitute a limitation to the present application.
  • the FPC 70 can also be connected to other electronic components and the main board 50 to realize the electrical connection between other electronic components and the main board 50, wherein the other electronic components can be, for example, a front camera, a rear camera, buttons 40, etc.
  • the embodiment of the present application provides an FPC 70, which is formed by combining at least two flexible units. Since the size of the flexible unit is smaller than that of the FPC with an integrated structure, the difficulty of preparation is reduced, the production cost is saved, and the production efficiency is improved; and when multiple flexible units with smaller sizes are prepared on a large board, it is conducive to typesetting. Compared with preparing multiple FPCs with an integrated structure on a large board of the same size, the utilization rate of the large board (the proportion of the actually used large board in the entire large board) is improved, and the waste of the large board is avoided, saving cost. In addition, it is conducive to the reuse of each flexible unit. For different electronic devices, it is not necessary to replace the entire FPC, only part of the flexible units need to be replaced; and the position between the flexible units can be changed at will, which improves the flexibility of the FPC 70. .
  • the specific structure of the FPC 70 will be introduced in detail below in conjunction with the mobile phone 100.
  • the FPC 70 connecting the display panel 10 and the motherboard 50 is taken as an example.
  • the embodiment of the present application does not limit the shape of the FPC 70.
  • the shape of the FPC 70 can be set according to the actual situation, and is not limited to the shape shown in FIG. 2 .
  • the shape of the FPC 70 can be changed accordingly according to the actual situation.
  • FPC 70 includes at least two flexible units 71, at least two flexible units 71 include a first flexible unit 711 and a second flexible unit 712, the first flexible unit 711 and the second flexible unit 712 are electrically connected.
  • the first flexible unit 711 is, for example, electrically connected to the display panel 10
  • the second flexible unit 712 is, for example, electrically connected to the main board 50 .
  • the first flexible unit 711 in the Z-axis direction, includes a first surface 7111 and a second surface 7112 , and also includes a first connecting portion 7113 .
  • the second flexible unit 712 includes a first surface 7121 and a second surface 7122 , and also includes a second connecting portion 7123 .
  • the first connecting portion 7113 and the second connecting portion 7123 overlap, that is, in the thickness direction of the FPC 70, the first connecting portion 7113 and the second connecting portion 7123 intersect, in other words, the first connecting portion 7123 overlaps.
  • the orthographic projection of the portion 7113 on the XY plane overlaps with the orthographic projection of the second connecting portion 7123 on the XY plane.
  • the second surface 7112 of the first flexible unit 711 is located on the side of the first flexible unit 711 away from the second flexible unit 712, and the first surface 7121 of the second flexible unit 712 is located on the side of the second flexible unit 712 away from the first flexible unit 711. side.
  • the first flexible unit 711 includes a plurality of first wires 7114 and a protective layer 7115 on the first wires 7114, the protective layer 7115 is provided with a plurality of hollow parts 71151, and the hollow parts 71151 expose the first In the part of the wiring 7114 , the first wiring 7114 exposed through the hollow part 71151 is the soldering point 71141 .
  • FIG. 6 only shows the protection layer 7115 and the first wiring 7114 .
  • each welding point 71141 is provided with a first connecting structure 7116 on the first surface 7111 away from the first flexible unit 711 , wherein one first connecting structure 7116 is electrically connected to one welding point 71141 .
  • a plurality of through holes 7124 are opened on the second connecting portion 7123 .
  • the second flexible unit 712 includes a plurality of second wires (not shown in the figure).
  • a plurality of through holes 7124 are provided in one-to-one correspondence with a plurality of second traces, that is, one through hole 7124 corresponds to one second trace.
  • a second connection structure 7125 is provided around the sidewall of each through hole 7124 .
  • the second connection structure 7125 extends to the first surface 7121 and the second surface 7122 of the second flexible unit 712 , and is electrically connected to the second wiring.
  • the second wiring of the second flexible unit 712 may only be located on one surface (the first surface 7121 or the second surface 7122); a part of the second wiring may also be located on the first surface 7121, and another part of the second wiring may be located on the first surface 7121.
  • the second trace is located on the second side 7122.
  • the second routing located on the first surface 7121 and another part of the second routing located on the second surface 7122 may overlap, and in this way, the design area of the second flexible unit 712 is reduced.
  • the second flexible unit 712 is applied in the mobile phone 100 , it is beneficial to the arrangement of other structures in the mobile phone 100 . In this application, only the wiring of the second flexible unit 712 is located on the first surface 7121 for illustration.
  • the first connection structure 7116 includes a first connection subsection 71161, an intermediate subsection 71162 and a second connection subsection 71163 connected in sequence; the first connection subsection 71161 is located at the first connection part 7113 and the second connection part 7123 and electrically connected to the second connection structure 7125 on the second surface 7122.
  • the middle subsection 71162 is located in the through hole 7124 and is in contact with and electrically connected to the second connection structure 7125 located in the through hole 7124 .
  • the second connection subsection 71163 protrudes from the first surface 7121 of the second flexible unit 712 through the through hole 7124, and is electrically connected with the second connection structure 7125 on the first surface 7121, so that the first flexible unit 711
  • the wiring is electrically connected to the second wiring of the second flexible unit 712 .
  • the first flexible unit 711 electrically connected to the display panel 10 may be first bent to the back of the display panel 10 (with the display panel 10 The surface opposite to the light-emitting side), and then the first flexible unit 711 and the second flexible unit 712 are electrically connected.
  • the first flexible unit 711 electrically connected to the display panel 10 is electrically connected to the second flexible unit 712 , and then the first flexible unit 711 and the second flexible unit 712 are bent to the back of the display panel 10 .
  • the first flexible unit 711 when the first flexible unit 711 is electrically connected to the display panel 10, referring to FIG. etc., wherein a fingerprint identification sensor can be set in the fingerprint hole 7118, and fingerprint identification can be performed when using the mobile phone 100.
  • the first component can be, for example, a display driver chip that drives the display panel 10 to display
  • the second component can be, for example, a resistor and/or or capacitance.
  • the embodiment of the present application does not limit the material of the first connection structure 7116, as long as the first wiring of the first flexible unit 711 and the second wiring of the second flexible unit 712 can be electrically connected.
  • the material of the first connection structure 7116 may be tin, copper, silver, etc., for example.
  • connections can be, for example, copper, aluminum, or the like.
  • the material of the first connection structure 7116 is tin
  • the material of the second connection structure 7125 is copper as an example for illustration.
  • a plurality of first flexible units 711 and a plurality of second flexible units 712 are formed on a large board.
  • the first flexible unit 711 includes a plurality of first routings and a protective layer located on the first routings, the protective layer is provided with a plurality of hollow parts, the hollow parts expose the first routing parts, and the first routing parts exposed through the hollow parts
  • a trace is a soldering point (all are shown in FIG. 10 ).
  • Each soldering point is provided with a first connection point 7116', wherein the first connection point 7116' is, for example, a solder point.
  • the second flexible unit 712 includes a plurality of second wires (not shown in the figure) and a plurality of through holes 7124 located in the second connection portion 7123 .
  • a second connecting structure (not shown in the figure) is provided around the side wall of each through hole 7124 .
  • the second connection structure extends to the first surface 7121 and the second surface 7122 of the second flexible unit 712 , and is electrically connected to the second wiring.
  • first connection point 7116' includes but not limited to a solder point, and the first connection point 7116' can also be a bump or a columnar conductor, for example.
  • one of the first flexible unit 711 and one second flexible unit 712 are selected.
  • the second flexible unit 712 is disposed above the first flexible unit 711 in such a way that the second surface 7122 of the second flexible unit 712 faces the first surface 7111 of the first flexible unit 711 .
  • the first connecting part 7113 and the second connecting part 7123 overlap, and the through hole 7124 is set corresponding to the first connecting point 7116', completing the alignment of the first flexible unit 711 and the second flexible unit 712 .
  • the corresponding arrangement of the through hole 7124 and the first connection point 7116' may be: in the Z-axis direction, the orthographic projection of a through hole 7124 on the first surface 7111 of the first flexible unit 711 covers a first flexible unit 711 A connection point 7116', that is, in the Z-axis direction, a through hole 7124 exposes a first connection point 7116'.
  • first flexible unit 711 and the second flexible unit 712 are aligned, for example, they can be pressed together by a transparent cover plate, and the solder point is heated and melted by laser, and the solder point passes through the through hole 7124 (forming the first connection structure 7116 ) and the second flexible unit 7124.
  • the two connection structures are electrically connected to realize the electrical connection between the first flexible unit 711 and the second flexible unit 712 . That is, the electrical connection between the first flexible unit 711 and the second flexible unit 712 is realized by laser welding to form the FPC 70.
  • an FPC 70' with an integrated structure if an FPC 70' with an integrated structure is directly formed, four FPCs 70' can be formed. And if according to the method provided by the embodiment of the present application, that is, the FPC 70 is made up of a first flexible unit 711 and a second flexible unit 712, continue to refer to FIG. 10 , four first flexible units 711 and eight second flexible units can be formed For the unit 712, compared with Fig. 13, four more second flexible units 712 can be provided. It can be seen from this that the utilization rate of large boards can be improved, the waste of large boards can be avoided, and costs can be saved. It has been verified that the imposition rate of FPC can be increased by more than 30%.
  • first flexible unit 711 may be electrically connected to the display panel 10 first, and then electrically connected to the second flexible unit 712 . It may also be that the first flexible unit 711 is electrically connected with the second flexible unit 712 and then electrically connected with the display panel 10 .
  • the formation process of the above-mentioned FPC 70 only simply shows the process of the electrical connection of the first flexible unit 711 and the second flexible unit 712 , whether the first flexible unit 711 is electrically connected to the display panel 10 first, and then electrically connected to the second flexible unit 712, or the first flexible unit 711 is electrically connected to the second flexible unit 712, and then electrically connected to the display panel 10 , the process of electrically connecting the first flexible unit 711 to the display panel 10 is not shown.
  • the first connecting portion 7113 is provided with a first positioning structure 7117 .
  • the second connecting portion 7123 is provided with a second positioning structure 7126 .
  • the shapes of the first positioning structure 7117 and the second positioning structure 7126 are the same or complementary.
  • the so-called first positioning structure 7117 and the second positioning structure 7126 are complementary in shape, that is, when the first flexible unit 711 and the second flexible unit 712 are aligned, the first positioning structure 7117 can be located inside the second positioning structure 7126; in other words, the orthographic projection of the first positioning structure 7117 on the XY plane surrounds the orthographic projection of the second positioning structure 7126 on the XY plane; or, the orthographic projection of the second positioning structure 7126 on the XY plane surrounds the first positioning structure Orthographic projection of 7117 on the plane where XY is located.
  • first positioning structure 7117 and the second positioning structure 7126 have the same shape, that is, when the first flexible unit 711 and the second flexible unit 712 are aligned, the orthographic projection of the first positioning structure 7117 on the XY plane is the same as that of the second positioning structure.
  • the orthographic projection of the structure 7126 on the XY plane coincides.
  • the first positioning structure 7116 is a positioning column
  • Structure 7123 is a positioning hole.
  • the second flexible unit 712 is disposed on the first flexible unit 711 , it only needs to extend the positioning post into the positioning hole.
  • the positioning column may move in the direction of the X axis or the direction of the Y axis.
  • the second flexible unit 712 is very thin, therefore, the movement of the positioning post may tear the positioning hole.
  • the positioning hole can be set at a position away from the edge of the second connecting portion 7123 , that is, the shortest distance from the positioning hole to the edge of the second connecting portion 7123 is W3, wherein W3 is greater than 0.5 mm.
  • the shape of the positioning post includes cylinder, cone or truncated cone; along the Z-axis direction, the shape of the positioning hole matches the shape of the positioning post.
  • the first positioning structure 7117 includes a positioning column
  • the second positioning structure 7126 includes a positioning groove
  • the unit 712 also includes a side surface 7127 (a surface parallel to the Z-axis direction) connecting the first surface 7121 and the second surface 7122; Since the positioning groove is located at the edge of the second connecting part 7123, there is no need to set more areas in the second connecting part 7123 to open the positioning groove, reducing the size of the second connecting part 7123, thereby reducing the size of the second flexible unit 712 .
  • the first positioning structure 7117 is a positioning hole (not shown in the figure), and the second positioning structure 7123 is also a positioning hole .
  • the second flexible unit 712 is arranged on the first flexible unit 711, it can be positioned by using the positioning column on the jig.
  • the process of setting the first positioning structure 7117 may affect the position on the first connecting part 7113.
  • the structure is affected, and the process of setting the second positioning structure 7126 may affect the structure on the second connecting part 7123, thereby affecting the first routing of the first flexible unit 711 and the second routing of the second flexible unit 712 electrical connection.
  • the first positioning structure 7117 is a positioning column, and a welding process is required to install the positioning column on the first connecting portion 7113 .
  • the welding process may affect the structure on the first connecting portion 7113 .
  • the second positioning structure 7126 is a positioning hole, which requires an etching process.
  • the etching process may affect the structures on the second connecting portion 7123 . Therefore, continue to refer to FIG. 5, the shortest distance from the first positioning structure 7117 to the first connecting structure 7116 is W1, wherein W1 is greater than 0.5 mm; continue to refer to FIG. 7, the shortest distance from the second positioning structure 7126 to the through hole 7124 is W2 , wherein W2 is greater than 0.5mm. In this way, the process of forming the first positioning structure 7117 and the second positioning structure 7126 can be avoided from affecting the original structure.
  • an adhesive layer 72 may also be provided where the first flexible unit 711 and the second flexible unit 712 overlap, that is, the adhesive layer 72 is located at the first connecting portion 7113 Between one surface 7111 and the second surface 7122 of the second connecting portion 7123 is used to connect the first surface 7111 of the first connecting portion 7113 and the second surface 7122 of the second connecting portion 7123 .
  • the adhesive layer 72 can pre-fix the first flexible unit 711 and the second flexible unit 712, so as to prevent the first flexible unit 711 and the second flexible unit from The flexible unit 712 moves during the laser welding process.
  • the setting of the adhesive layer 72 can make the first flexible unit 711 and the second flexible unit 712 firmly fixed together, avoiding
  • the stress is all integrated on the first connection structure 7116, causing the first connection structure 7116 to separate from the welding point 71141, and/or, the first connection structure 7116 to separate from the second connection structure 7125 , affecting the electrical connection between the first flexible unit 711 and the second flexible unit 712 , thereby affecting signal transmission.
  • the adhesive layer 72 may be provided on the first connecting portion 7113 first, and then the first flexible unit 711 and the second flexible unit 712 are assembled.
  • the adhesive layer 72 may also be provided on the second connecting portion 7123 first, and then the first flexible unit 711 and the second flexible unit 712 are assembled. It is also possible to arrange the adhesive layer 72 on both the first connecting part 7113 and the second connecting part 7123, and then assemble the first flexible unit 711 and the second flexible unit 712.
  • the embodiments of the present application are not limited this time.
  • the embodiment of the present application does not limit the position where the adhesive layer 72 is disposed on the first connecting portion 7113 and/or the second connecting portion 7123 .
  • the adhesive layer 72 when the adhesive layer is disposed on the first flexible unit 711 , the adhesive layer 72 partially surrounds the plurality of first connection structures 7116 .
  • the adhesive layer 72 is disposed around a plurality of first connection structures 7116 .
  • the advantage of this arrangement is that the adhesive layer 72 can fix the first flexible unit 711 and the second flexible unit 712 in all directions, avoiding the movement of the first flexible unit 711 and the second flexible unit 712, and avoiding the first flexible unit 711 and the second flexible unit 712 from moving. 711 and the second flexible unit 712 are separated.
  • the embodiment of the present application does not limit the material of the adhesive layer 72.
  • the adhesive layer 72 may be back adhesive or double-sided adhesive, for example.
  • the second connection subsection 71163 protrudes from the first surface 7121 of the second flexible unit 712 through the through hole 7124 and is electrically connected to the second connection structure 7125 on the first surface 7121 . And in order to prevent the second connection subsection 71163 from short circuiting with other metal structures in the mobile phone 100 .
  • an insulating layer 73 is disposed on the first surface 7121 of the second flexible board unit 712 , and the insulating layer 73 at least covers the exposed second connecting subsection 71163 .
  • the electrical connection between the first flexible unit 711 and the second flexible unit 712 can be realized by laser welding.
  • the thickness of the first connection subsection 71161 is H1, wherein H1 is greater than or It is equal to 0.02mm and less than or equal to 0.04mm;
  • the thickness of the second connecting subsection 71163 is H2, wherein H2 is greater than or equal to 0.03mm and less than or equal to 0.05mm.
  • the thicknesses of the first flexible unit 711 and the second flexible unit 712 are both greater than or equal to 0.1 mm and less than or equal to 0.15 mm.
  • the thickness H3 at the first connecting portion 7113 and the second connecting portion 7123 is greater than or equal to 0.25mm and less than or equal to 0.4mm.
  • the thickness of the FPC 70 provided by the embodiment of the present application is small, and does not occupy too much area of the accommodating cavity, which is beneficial to the setting of other structures in the mobile phone 100.
  • first flexible unit 711 and the second flexible unit 712 are electrically connected together through a BTB connector or a ZIF connector, in order to prevent the connector from falling off, it is necessary to add additional steel sheets on the connector for fixing. , and this application does not need to add steel sheets for fixing, so that the structure is simple and the cost can be reduced.
  • a receiving groove 81 is defined on the side of the battery compartment 80 close to the display panel 10 .
  • the accommodating groove 81 is used for accommodating the first connecting portion 7113 and the second connecting portion 7123 .
  • the receiving groove 81 accommodates the first connecting portion 7113 and the second connecting portion 7123, which can completely avoid the overlap of the first connecting portion 7113 and the second connecting portion 7123 resulting in an increase in the thickness of the whole machine.
  • the accommodating groove 81 may or may not pass through the battery compartment 80 .
  • FIG. 18 is described by taking the accommodating groove 81 passing through the battery compartment 80 as an example.
  • the position of the battery compartment 80 in the accommodating groove 81 will have a level difference.
  • the edge of the battery 50 will cause stress concentration on the edge of the receiving groove 81, so that the edge of the battery 50 is deformed, which may As a result, the positive and negative poles of the battery 50 are short-circuited, causing battery safety problems. Based on this, continue to refer to FIG.
  • the receiving groove 81 is set at a relatively central position of the battery compartment 80 In this way, the edge of the battery 50 can be prevented from causing stress concentration on the edge of the receiving groove 81 , causing the edge of the battery 50 to be deformed.
  • the embodiment of the present application does not limit the material of the supporting structure, as long as it can play a supporting role.
  • the support structure 74 may include metal materials such as steel or copper alloy.
  • the embodiment of the present application does not limit the material of the heat insulation structure 75 , as long as it can prevent the display panel 10 from being damaged by high temperature.
  • the material of the thermal insulation structure 75 may be, for example, aerogel and other materials capable of insulating high temperature.
  • the heat insulation structure 75 can be set according to the welding scene of the FPC 70.
  • the first flexible unit 711 electrically connected to the display panel 10 is bent to the back of the display panel 10 and then laser-welded with the second flexible unit 712 , it is necessary to place the first flexible unit 711 on the side away from the second flexible unit 712
  • a heat insulating structure 75 is provided.
  • the heat insulating structure 75 is not required.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Structure Of Printed Boards (AREA)
  • Combinations Of Printed Boards (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)

Abstract

本申请提供一种柔性电路板及电子设备，涉及电路技术领域，可以降低制备难度，节省制备成本。柔性电路板包括第一柔性单元和第二柔性单元；第一柔性单元包括第一连接部和多条第一走线，每条第一走线包括位于第一连接部的焊接点；每个焊接点上设置有第一连接结构，且焊接点与第一连接结构电连接；第二柔性单元包括第一面和第二面，第一面位于第二柔性单元背离第一柔性单元的一侧；第二柔性单元还包括第二连接部和多条第二走线；第二连接部上开设有多个通孔，多个通孔与多条第二走线一一对应设置；每个通孔侧壁的四周设置有第二连接结构，且第二连接结构延伸至第一面和第二面，且与第二走线电连接；第一连接结构穿过通孔，与第二连接结构电连接。

Description

柔性电路板及电子设备
本申请要求于2021年12月28日提交中国国家知识产权局、申请号为202123339321.9、申请名称为“柔性电路板及电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种柔性电路板及电子设备。
背景技术
柔性电路板(flexible printed circuit，FPC)因具有柔软、随意弯曲折叠、厚度薄等优点，广泛应用于手机、平板等电子设备中。
现有电子设备中的FPC一般是一体结构(一体成型)。当FPC为一体结构时，尺寸较大，制备难度较大，制备成本较高；且不同的电子设备FPC的尺寸不同，FPC无法进行复用。
实用新型内容
为了解决上述技术问题，本申请提供一种柔性电路板及电子设备。可以降低制备难度，节省制备成本。
第一方面，本申请实施例提供一种柔性电路板，该柔性电路板包括：第一柔性单元和第二柔性单元；第一柔性单元包括第一连接部和多条第一走线，每条第一走线包括位于第一连接部的焊接点；每个焊接点上设置有第一连接结构，且焊接点与第一连接结构电连接；第二柔性单元包括第一面和第二面，第一面位于第二柔性单元背离第一柔性单元的一侧；第二柔性单元还包括第二连接部和多条第二走线；第二连接部上开设有多个通孔，多个通孔与多条第二走线一一对应设置；每个通孔侧壁的四周设置有第二连接结构，且第二连接结构延伸至第一面和第二面，且与第二走线电连接；第一连接结构穿过通孔，并与第二连接结构电连接，以使第一柔性单元的第一走线和第二柔性单元的第二走线电连接。
本申请实施例提供的柔性电路板由至少两个柔性单元组合形成。由于柔性单元相比于一体结构的柔性电路板尺寸较小，因此，降低制备难度，节省制备成本，提高制备效率；且当在一大板上制备多个尺寸较小的柔性单元时，有利于排版，相比于在同一尺寸的大板上制备多个一体结构的柔性电路板时，提高大板的利用率(实际利用的大板的部分在整个大板中占的比重)，避免大板的浪费，节约成本。此外，有利于各柔性单元的复用，针对不同的电子设备，无需更换整个柔性电路板，只需更换部分柔性单元即可；且柔性单元之间的位置可以随意的更改，提高柔性电路板使用的灵活性。此外，第一连接部和第二连接部通过第一连接结构和第二连接结构的电连接即可实现电连接，结构简 单。
在一些可能实现的方式中，第一连接结构包括依次连接的第一连接分部、中间分部和第二连接分部；第一连接分部位于第一柔性单元和第二柔性单元之间，且与位于第二面的第二连接结构电连接，中间分部位于通孔中，与位于通孔中的第二连接结构接触并电连接，第二连接分部突出于第一面，并与位于第一面的第二连接结构电连接。即第一连接结构与第二连接结构的接触面积增大，可以更好的将第一连接结构和第二连接结构电连接，保证第一柔性单元的第一走线和第二柔性单元的第二走线的电连接。
在一些可能实现的方式中，第一连接结构和第二连接结构通过焊接电连接。例如，第一连接结构和第二连接结构通过激光焊接的方式电连接，需要说明的是，第一连接结构和第二连接结构通过焊接电连接的方式包括但不限于激光焊接。
在一些可能实现的方式中，在上述第一连接结构和第二连接结构通过焊接电连接的基础上，沿第一方向，第一连接分部的厚度为H1，其中，H1大于或等于0.02mm，且小于或等于0.04mm；第二连接分部的厚度为H2，其中，H2大于或等于0.03mm，且小于或等于0.05mm；第一方向为第一连接部指向第二连接部的方向。通过焊接的方式将第一柔性单元的第一走线和第二柔性单元的第二走线电连接时，柔性电路板的厚度较小，不会占用电子设备容纳腔体太多的区域，有利于电子设备内其他结构的设置。且结构简单。且可以降低成本。
在一些可能实现的方式中，柔性电路板还包括粘合层；粘合层位于第一连接部和所述第二连接部之间。一方面，在将第一柔性单元和第二柔性单元进行组装时，粘合层可以对第一柔性单元和第二柔性单元进行预固定，避免第一柔性单元和第二柔性单元在焊接(例如激光焊接)过程中有移动。另一方面，当电子设备组装完成，在使用过程中，受到较大外力时，例如跌落，粘合层的设置可以使第一柔性单元和第二柔性单元稳固的固定在一起，避免柔性电路板在Z轴方向上有撕扯时，应力全部集成在第一连接结构上，导致第一连接结构与焊接点分离，和/或，第一连接结构与第二连接结构分离，影响第一柔性单元和第二柔性单元的电连接，进而影响信号的传输。
在一些可能实现的方式中，在上述柔性电路板还包括粘合层的基础上，粘合层环绕多个第一连接结构设置。这样设置的好处在于，粘合层可以在各方向将第一柔性单元和第二柔性单元进行固定，避免第一柔性单元和第二柔性单元有移动，以及避免第一柔性单元和第二柔性单元分离。
在一些可能实现的方式中，第一连接部上设置有第一定位结构；第二连接部上设置有第二定位结构；第一定位结构和第二定位结构在第一连接部上的正投影的形状相同或互补。第一定位结构和第二定位结构的设置，在对第一柔性单元和第二柔性单元进行对 位时，可以提高对位的效率以及准确性。
在一些可能实现的方式中，在上述第一连接部上设置有第一定位结构；第二连接部上设置有第二定位结构的基础上，第一定位结构到第一连接结构的最近距离为W1，其中，W1大于0.5mm；第二定位结构到通孔的最近距离为W2，其中，W2大于0.5mm。即第一定位结构距离第一连接结构较远，第二定位结构距离通孔较远，这样一来，可以避免在形成第一定位结构和第二定位结构的过程中对原有结构造成影响。
在一些可能实现的方式中，在上述第一连接部上设置有第一定位结构；第二连接部上设置有第二定位结构的基础上，所述第一定位结构包括定位柱；所述第二定位结构包括定位孔。第一定位结构和第二定位结构结构简单，不会占用第一连接部和第二连接部太多区域，且形成过程简单，提高制备效率。
在一些可能实现的方式中，在上述第一定位结构包括定位柱；第二定位结构包括定位孔的基础上，定位孔到第二连接部的边缘的最近距离为W3，其中，W3大于0.5mm。这样一来，在对第一柔性单元711和第二柔性单元712进行对位时，即便定位柱会在X轴方向或Y轴方向有移动，使得定位孔出现裂纹，但是也不会延伸至第二连接部的边缘。
在一些可能实现的方式中，在上述第一定位结构包括定位柱；第二定位结构包括定位孔的基础上，沿第一方向，定位柱的形状包括圆柱、圆锥或圆台；沿第一方向，定位孔的形状与定位柱的形状相匹配；第一方向为第一连接部指向第二连接部的方向。当定位柱的形状包括圆锥或圆台时，可以提高对位效率。
在一些可能实现的方式中，在上述第一连接部上设置有第一定位结构；第二连接部上设置有第二定位结构的基础上，第一定位结构包括定位柱，第二定位结构包括定位槽；第二柔性单元还包括连接第一面和第二面的侧面；定位槽贯穿第一面和第二面，且定位槽的开口位于侧面。由于定位槽位于第二连接部的边缘，无需在第二连接部中设置较多的区域来开设定位槽，如此，可以减小第二连接部的尺寸，进而减小第二柔性单元的尺寸。
在一些可能实现的方式中，第一面和第二面均包括第二走线；且沿第一方向，位于第一面的第二走线与位于第二面的第二走线交叠；第一方向为第一连接部指向第二连接部的方向。这样一来，减小第二柔性单元的设计面积。当该第二柔性单元应用于电子设备中时，有利于电子设备内其他结构的设置。
在一些可能实现的方式中，柔性电路板还包括绝缘层；第二连接部背离第一连接部的一侧设置有绝缘层。绝缘层的设置可以防止第二连接分部与电子设备内的其他金属结 构短路。
第二方面，本申请实施例提供一种电子设备，包括上述任一项的柔性电路板。能够实现上述柔性电路板的所有效果。
在一些可能实现的方式中，电子设备还包括电池以及容纳电池的电池仓；电池仓靠近柔性电路板的一侧开设有容纳槽；容纳槽用于容纳第一连接部和第二连接部，可以完全避免第一连接部和第二连接部的交叠导致整机厚度增加。
在一些可能实现的方式中，在上述容纳槽用于容纳第一连接部和第二连接部的基础上，容纳槽的边缘到电池仓的侧壁的最近距离为W4，其中，W4大于或等于4mm。即容纳槽距离电池的边缘较远，这样一来，可以避免电池的边缘在容纳槽的边缘造成应力集中，导致电池的边缘发生形变，进而导致电池的正负极短路，造成电池安全的问题。
在一些可能实现的方式中，电子设备还包括支撑结构；支撑结构位于第一连接部背离第二连接部的一侧。支撑结构的设置可以保证第一柔性单元和第二柔性单元之间焊接的平坦度，避免不平坦导致焊接不良。
在一些可能实现的方式中，电子设备还包括隔热结构；隔热结构位于第一连接部背离第二连接部的一侧。通过隔热结构对显示面板进行保护，防止焊接过程中较高的温度损伤显示面板。
附图说明
图1为本申请实施例提供的一种电子设备的结构示意图；
图2为图1所示电子设备的立体分解示意图；
图3为本申请实施例提供的一种FPC的结构示意图；
图4为图3沿AA’方向的剖面图；
图5为图3中的一种第一柔性单元的结构示意图；
图6为图5中QQ区域的局部放大图；
图7为图3中的一种第二柔性单元的结构示意图；
图8为图7沿BB’方向的剖面图；
图9为本申请实施例提供的一种第一柔性单元的结构示意图；
图10为本申请实施例提供的一种制备FPC的过程示意图；
图11为本申请实施例提供的一种制备FPC的过程示意图；
图12为本申请实施例提供的一种制备FPC的过程示意图；
图13为相关技术提供的一种制备FPC的过程示意图；
图14为图3沿CC’方向的剖面图；
图15为本申请实施例提供的又一种FPC的结构示意图；
图16为本申请实施例提供的又一种第一柔性单元的结构示意图；
图17为本申请实施例提供的又一种FPC的结构示意图；
图18为本申请实施例提供的一种显示面板和中框的结构示意图；
图19为图18沿DD’方向的剖面图；
图20为本申请实施例提供的一种显示面板和FPC的结构示意图；
图21为图20沿EE’方向的剖面图。
附图标记：
10-显示面板；20-后盖；30-中框；40-按键；50-主板；60-电池；70-FPC；80-电池仓；
71-柔性单元；72-粘合层；73-绝缘层；74-支撑结构；75-隔热结构；81-容纳槽；
711-第一柔性单元；712-第二柔性单元；
7111-第一柔性单元的第一面；7112-第一柔性单元的第二面；7113-第一连接部；7114-第一走线；7115-保护层；7116-第一连接结构；7117-第一定位结构；7118-指纹孔；7119-第一元件；7120-第二元件；7121-第二柔性单元的第一面；7122-第二柔性单元的第二面；7123-第二连接部；7124-通孔；7125-第二连接结构；7126-第二定位结构；7127-第二柔性单元的侧面；7116’-第一连接点；
71141-焊接点；71151-镂空部；71161-第一连接分部；71162-中间分部；71163-第二连接分部。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本申请实施例的说明书和权利要求书中的术语“第一”和“第二”等是用于区别不同的对象，而不是用于描述对象的特定顺序。例如，第一目标对象和第二目标对象等是用于区别不同的目标对象，而不是用于描述目标对象的特定顺序。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
在本申请实施例的描述中，除非另有说明，“多个”的含义是指两个或两个以上。例如，多个处理单元是指两个或两个以上的处理单元；多个系统是指两个或两个以上的系统。
本申请实施例提供一种电子设备，本申请实施例提供的电子设备可以是手机、电脑、平板电脑、个人数字助理(personal digital assistant，简称PDA)、车载电脑、电视、智能穿戴式设备、智能家居设备等包含柔性电路板(flexible printed circuit，FPC)的电子设备。本申请实施例对上述电子设备的具体形式不作特殊限定。如图1所示，以下为了方便说明，以电子设备是手机为例进行说明。
需要说明的是，为了便于清楚描述后续各结构特征及结构特征的位置关系，以X轴方向、Y轴方向及Z轴方向来规定手机内各结构的位置关系。其中，X轴方向为手机的宽度方向，Y轴方向为手机的长度方向，Z轴方向(也称第一方向)为手机的厚度方向。
参见图1，手机100包括显示面板10、后盖20、中框30、按键40。显示面板10和后盖20相对设置，中框30位于显示面板10和后盖20之间。显示面板10、中框30和后盖20可以围成容纳腔体。结合图2，容纳腔体中设置有主板50、电池60、至少一个FPC 70、容纳电池60的电池仓80以及摄像头(前置摄像头和/或后置摄像头)等结构。
显示面板10例如包括液晶显示(Liquid Crystal Display，LCD)面板、有机发光二极管(Organic Light Emitting Diode，OLED)显示面板和LED显示面板等，其中，LED显示面板例如包括Micro-LED显示面板、Mini-LED显示面板等。本申请实施例不对显示面板10的类型进行限定。
后盖20的材料例如可以包括塑料、素皮、玻璃纤维等不透光材料；也可以包括玻璃等透光材料。本申请实施例不对后盖20的材料进行限定。
中框30上设置有按键40。按键40可以是调节音量大小的音量键，也可以是唤醒和灭屏的电源键，本申请实施例对此不作具体限定。
继续参见图2，显示面板10例如可以通过FPC 70与主板50电连接。
此处需要说明的是，图2仅以FPC 70连接显示面板10和主板50作为示例，但不构成对本申请的限定。FPC 70还可以连接其他电子元件和主板50，实现其他电子元件与主板50的电连接，其中，其他电子元件例如可以为前置摄像头、后置摄像头、按键40等。
基于背景技术中的问题，本申请实施例提供了一种FPC 70，该FPC 70由至少两个柔性单元组合形成。由于柔性单元相比于一体结构的FPC尺寸较小，因此，制备难度降低，节省制备成本，提高制备效率；且当在一大板上制备多个尺寸较小的柔性单元时，有利于排版，相比于在同一尺寸的大板上制备多个一体结构的FPC时，提高大板的利用率(实际利用的大板的部分在整个大板中占的比重)，避免大板的浪费，节约成本。此外，有利于各柔性单元的复用，针对不同的电子设备，无需更换整个FPC，只需更换部分柔性单元即可；且柔性单元之间的位置可以随意的更改，提高FPC 70使用的灵活性。
下面结合手机100对FPC 70的具体结构进行详细介绍。其中，以FPC 70连接显示面板10和主板50作为示例。
在介绍之前，需要说明的是，对于FPC 70的形状，本申请实施例不对FPC 70的形状进行限定。当FPC 70应用的场景相同(例如连接显示面板10和主板50)时，FPC 70 的形状可以根据实际情况设置，并不限于图2所示的形状。当FPC 70的应用场景不同(例如连接前置摄像头和主板50)时，FPC 70的形状可以根据实际情况做出相应改变。
参见图2和图3，FPC 70包括至少两个柔性单元71，至少两个柔性单元71包括第一柔性单元711和第二柔性单元712，第一柔性单元711和第二柔性单元712电连接。第一柔性单元711例如与显示面板10电连接，第二柔性单元712例如与主板50电连接。
参见图4，在Z轴方向上，第一柔性单元711包括第一面7111和第二面7112，还包括第一连接部7113。第二柔性单元712包括第一面7121和第二面7122，还包括第二连接部7123。在Z轴方向上，第一连接部7113和第二连接部7123交叠，即在FPC 70的厚度方向上，第一连接部7113和第二连接部7123有交叉，换句话说，第一连接部7113在XY面的正投影和第二连接部7123在XY面的正投影面有交叠。且第一柔性单元711的第二面7112位于第一柔性单元711背离第二柔性单元712的一侧，第二柔性单元712的第一面7121位于第二柔性单元712背离第一柔性单元711的一侧。
参见图5和图6，第一柔性单元711包括多条第一走线7114和位于第一走线7114上的保护层7115，保护层7115开设有多个镂空部71151，镂空部71151露出第一走线7114的部分，通过镂空部71151露出的第一走线7114即为焊接点71141。
此处需要说明的是，为了清楚的展示焊接点71141和第一走线7114的关系，图6仅示出了保护层7115和第一走线7114。
继续参见图4和图5，每个焊接点71141背离第一柔性单元711的第一面7111的上设置有第一连接结构7116，其中，一个第一连接结构7116与一个焊接点71141电连接。
参见图4、图7和图8，第二连接部7123上开设有多个通孔7124。第二柔性单元712包括多条第二走线(图中未示出)。多个通孔7124与多条第二走线一一对应设置，即一个通孔7124对应一条第二走线。
参见图4，每个通孔7124侧壁的四周设置有第二连接结构7125。第二连接结构7125延伸至第二柔性单元712的第一面7121和第二面7122，与第二走线电连接。
此处需要说明的是，第二柔性单元712的第二走线可以仅位于一个面(第一面7121或第二面7122)；也可以一部分第二走线位于第一面7121，另一部分第二走线位于第二面7122。当通孔7124对应的第二走线在第一面7121时，那么第二连接结构7125延伸后可以和第一面7121的第二走线电连接；当通孔7124对应的第二走线在第二面7122时，那么第二连接结构7125延伸后可以和第二面7122的第二走线电连接。当一部分第二走线位于第一面7121，另一部分第二走线位于第二面7122时，在Z轴方向上，位于第一面7121的第二走线和位于第二面7122的第二走线可以交叠，这样一来，减小第二柔性单元712的设计面积。当该第二柔性单元712应用于手机100中时，有利于手机100内其他结构的设置。本申请均仅以第二柔性单元712的走线位于第一面7121为例进行的说明。
继续参见图4，第一连接结构7116包括依次连接的第一连接分部71161、中间分部 71162和第二连接分部71163；第一连接分部71161位于第一连接部7113和第二连接部7123之间，且与位于第二面7122上的第二连接结构7125电连接。中间分部71162位于通孔7124中，且与位于通孔7124中的第二连接结构7125接触并电连接。第二连接分部71163穿过通孔7124突出于第二柔性单元712的第一面7121，并与位于第一面7121上的第二连接结构7125电连接，使得第一柔性单元711的第一走线和第二柔性单元712的第二走线电连接。
可以理解的是，当第一柔性单元711和第二柔性单元712电连接时，可以是先将与显示面板10电连接的第一柔性单元711弯折至显示面板10的背面(与显示面板10的出光侧相反的面)，然后再将第一柔性单元711与第二柔性单元712电连接。也可以是，先将与显示面板10电连接的第一柔性单元711与第二柔性单元712电连接，然后再将第一柔性单元711和第二柔性单元712弯折至显示面板10的背面。还可以是，先将第一柔性单元711的一端和第二柔性单元712电连接，再将第一柔性单元711的另一端与显示面板10电连接，然后将第一柔性单元711和第二柔性单元712弯折至显示面板10的背面。本申请实施例对此不作限定。
可选的，当第一柔性单元711与显示面板10电连接时，参见图9，第一柔性单元711的第一面7111上例如可以设置有指纹孔7118、第一元件7119和第二元件7120等，其中，指纹孔7118内可以设置指纹识别传感器，当使用手机100时可以进行指纹识别，第一元件例如可以为驱动显示面板10进行显示的显示驱动芯片，第二元件例如可以为电阻和/或电容。
对于第一连接结构7116的材料，本申请实施例不对第一连接结构7116的材料进行限定，只要可以实现第一柔性单元711的第一走线和第二柔性单元712的的第二走线电连接即可。示例性的，第一连接结构7116的材料例如可以是锡、铜、银等。
对于第二连接结构7125的材料，本申请实施例不对第二连接结构7125的材料进行限定，只要可以实现第一柔性单元711的第一走线和第二柔性单元712的第二走线的电连接，例如可以是铜、铝等。
下面对第一柔性单元711的第一走线和第二柔性单元712的第二走线电连接的过程进行介绍。其中，以第一连接结构7116的材料为锡，第二连接结构7125的材料为铜为例进行说明。
参见图10，在一大板上形成多个第一柔性单元711和多个第二柔性单元712。其中，第一柔性单元711包括多条第一走线和位于第一走线上的保护层，保护层开设有多个镂空部，镂空部露出第一走线的部分，通过镂空部露出的第一走线即为焊接点(图10中均为示出)。每个焊接点上设置有第一连接点7116’，其中，第一连接点7116’例如为焊锡点。第二柔性单元712包括多条第二走线(图中未示出)和位于第二连接部7123的多个通孔7124。每个通孔7124侧壁的四周设置有第二连接结构(图中未示出)。第二连接结构延伸至第二柔性单元712的第一面7121和第二面7122，与第二走线电连接。
此处需要说明的是，第一连接点7116’包括但不限于焊锡点，第一连接点7116’例如还可以是凸起或柱形导体等。
参见图11，选取其中一个第一柔性单元711和一个第二柔性单元712。
参见图12，沿Z轴方向，以第二柔性单元712的第二面7122朝向第一柔性单元711的第一面7111的方式将第二柔性单元712设置于第一柔性单元711的上方。其中，在Z轴方向上，第一连接部7113和第二连接部7123交叠，通孔7124与第一连接点7116’对应设置，完成第一柔性单元711和第二柔性单元712的对位。
此处需要说明的是，通孔7124与第一连接点7116’对应设置可以是：在Z轴方向上，一个通孔7124在第一柔性单元711的第一面7111上的正投影覆盖一个第一连接点7116’，即在Z轴方向上，一个通孔7124露出一个第一连接点7116’。
第一柔性单元711和第二柔性单元712对位好后，例如可以通过透明盖板压紧，使用激光将焊锡点加热熔融，焊锡点穿过通孔7124(形成第一连接结构7116)和第二连接结构电连接，实现第一柔性单元711和第二柔性单元712的电连接。即通过激光焊接的方式实现第一柔性单元711和第二柔性单元712的电连接，以形成FPC 70。
通过图10可知，由于柔性单元71相比于一体结构的FPC尺寸较小，因此，制备难度降低，节省制备成本，提高制备效率；且当在一大板上制备多个尺寸较小的柔性单元时，有利于排版，相比于在同一尺寸的大板上制备多个一体结构的FPC时，提高大板的利用率(实际利用的大板的部分在整个大板中占的比重)，避免大板的浪费，节约成本。下面通过与相关技术进行对比来说明该有益效果。
参见图13，在相同的大板上，如果直接形成一体结构的FPC 70’，那么可形成四个FPC 70’。而如果按照本申请实施例提供的方式，即FPC 70由一个第一柔性单元711和一个第二柔性单元712组成，继续参见图10，可以形成4个第一柔性单元711和8个第二柔性单元712，相比于图13，可以多设置4个第二柔性单元712。如此可见，提高大板的利用率，避免大板的浪费，节约成本。经验证，FPC的拼版率可以提高30％以上。
需要说明的是，由前述内容可知，第一柔性单元711可以先与显示面板10电连接后，再与第二柔性单元712电连接。也可以是第一柔性单元711与第二柔性单元712电连接后，再与显示面板10电连接。可以理解的是，为了便于说明第一柔性单元711和第二柔性单元712的电连接，上述FPC 70的形成过程仅简单的示出了第一柔性单元711和第二柔性单元712电连接的过程，不论是第一柔性单元711先与显示面板10电连接后，再与第二柔性单元712电连接，还是第一柔性单元711与第二柔性单元712电连接后，再与显示面板10电连接，均未示出第一柔性单元711与显示面板10电连接的过程。
在对第一柔性单元711和第二柔性单元712进行对位时，为了提高对位的效率以及准确性。继续参见图5，第一连接部7113设置有第一定位结构7117。继续参见图7和图8，第二连接部7123设置有第二定位结构7126。当第二柔性单元712设置于第一柔性单元711的上方时，只需将第一柔性单元711上的第一定位结构7117和第二柔性单元712上的第二定位结构7126进行对位即可。
示例性的，第一定位结构7117和第二定位结构7126的形状相同或互补。
所谓第一定位结构7117和第二定位结构7126的形状互补，即当第一柔性单元711和第二柔性单元712对位时，第一定位结构7117可以位于第二定位结构7126的内部；换句话说，第一定位结构7117在XY所在的平面的正投影环绕第二定位结构7126在 XY所在的平面的正投影；或者，第二定位结构7126在XY所在的平面的正投影环绕第一定位结构7117在XY所在的平面的正投影。
所谓第一定位结构7117和第二定位结构7126的形状相同，即当第一柔性单元711和第二柔性单元712对位时，第一定位结构7117在XY所在的平面的正投影与第二定位结构7126在XY所在的平面的正投影重合。
当第一定位结构7117和第二定位结构7126的形状互补时，在一些可能实现的方式中，继续参见图5，第一定位结构7116为定位柱，继续参见图7和图8，第二定位结构7123为定位孔。当第二柔性单元712设置于第一柔性单元711上时，定位柱伸入定位孔即可。
在此情况下，考虑到在对第一柔性单元711和第二柔性单元712进行对位时，定位柱可能会在X轴方向或Y轴方向有移动。而第二柔性单元712很薄，因此，定位柱的移动可能会将定位孔撕裂。基于此，继续参见图7，可以将定位孔设置在远离第二连接部7123边缘的位置，即定位孔到第二连接部7123的边缘的最近距离为W3，其中，W3大于0.5mm。
此外，为了提高对位效率，参见图14，沿Z轴方向，定位柱的形状包括圆柱形、圆锥或圆台；沿Z轴方向，定位孔的形状与定位柱的形状相匹配。
当第一定位结构7117和第二定位结构7126的形状互补时，又一些可能实现的方式中，参见图15，第一定位结构7117包括定位柱，第二定位结构7126包括定位槽；第二柔性单元712还包括连接第一面7121和第二面7122的侧面7127(平行于Z轴方向的面)；定位槽贯穿第一面7121和第二面7122，且定位槽的开口位于侧面7127。由于定位槽位于第二连接部7123的边缘，无需在第二连接部7123中设置较多的区域来开设定位槽，减小第二连接部7123的尺寸，进而减小第二柔性单元712的尺寸。
当第一定位结构7117和第二定位结构7126的形状相同时，在一些可能实现的方式中，第一定位结构7117为定位孔(图中未示出)，第二定位结构7123也为定位孔。当第二柔性单元712设置于第一柔性单元711上时，可以利用治具上的定位柱进行定位。
考虑到，当在第一柔性单元711上设置第一定位结构7117，在第二柔性单元712上设置第二定位结构7123时，设置第一定位结构7117工艺可能会对第一连接部7113上的结构造成影响，以及，设置第二定位结构7126工艺可能会对第二连接部7123上的结构造成影响，进而影响第一柔性单元711的第一走线和第二柔性单元712的第二走线电连接。例如，第一定位结构7117是定位柱，需要采用焊接的工艺将定位柱设置于第一连接部7113。而焊接工艺可能会对第一连接部7113上的结构造成影响。第二定位结构7126是定位孔，需要采用蚀刻工艺。而蚀刻工艺可能会对第二连接部7123上的结构造成影响。因此，继续参见图5，第一定位结构7117到第一连接结构7116的最近距离为W1，其中，W1大于0.5mm；继续参见图7，第二定位结构7126到通孔7124的最近距离为W2，其中，W2大于0.5mm。这样一来，可以避免形成第一定位结构7117和第二定位结构7126的工艺对原有结构造成影响。
可选的，继续参见图4和图5，还可以在第一柔性单元711和第二柔性单元712存在交叠的地方设置粘合层72，即粘合层72位于第一连接部7113的第一面7111和第二 连接部7123的第二面7122之间，用于连接第一连接部7113的第一面7111和第二连接部7123的第二面7122。一方面，在将第一柔性单元711和第二柔性单元712进行组装时，粘合层72可以对第一柔性单元711和第二柔性单元712进行预固定，避免第一柔性单元711和第二柔性单元712在激光焊接过程中有移动。另一方面，当手机100组装完成，在使用过程中，受到较大外力时，例如跌落，粘合层72的设置可以使第一柔性单元711和第二柔性单元712稳固的固定在一起，避免FPC 70在Z轴方向上有撕扯时，应力全部集成在第一连接结构7116上，导致第一连接结构7116与焊接点71141分离，和/或，第一连接结构7116与第二连接结构7125分离，影响第一柔性单元711和第二柔性单元712的电连接，进而影响信号的传输。
此处需要说明的是，继续参见图4和图5，可以先在第一连接部7113上设置粘合层72，然后再将第一柔性单元711和第二柔性单元712进行组装。也可以先在第二连接部7123上设置粘合层72，然后再将第一柔性单元711和第二柔性单元712进行组装。还可以是在第一连接部7113和第二连接部7123上均设置粘合层72，然后然后再将第一柔性单元711和第二柔性单元712进行组装。本申请实施例此次不作限定。
此外，本申请实施例不对粘合层72设置在第一连接部7113和/或第二连接部7123的位置进行限定。例如，继续参见图5，当粘合层设置于第一柔性单元711上时，粘合层72部分环绕多个第一连接结构7116。再如，参见图16，粘合层72围绕多个第一连接结构7116设置。这样设置的好处在于，粘合层72可以在各方向将第一柔性单元711和第二柔性单元712进行固定，避免第一柔性单元711和第二柔性单元712有移动，以及避免第一柔性单元711和第二柔性单元712分离。
对于粘合层72的材料，本申请实施例不对粘合层72的材料进行限定，示例性的，粘合层72例如可以为背胶或双面胶等。
由前述内容可知，第二连接分部71163穿过通孔7124突出于第二柔性单元712的第一面7121，并与位于第一面7121上的第二连接结构7125电连接。而为了防止第二连接分部71163与手机100内的其他金属结构短路。参见图17，第二柔板单元712的第一面7121上设置有绝缘层73，该绝缘层73至少覆盖露出的第二连接分部71163。
由前述内容可知，例如可以通过激光焊接的方式实现第一柔性单元711和第二柔性单元712的电连接。继续参见图4，当通过激光焊接的方式将第一柔性单元711和第二柔性单元712电连接在一起时，沿Z轴方向，第一连接分部71161的厚度为H1，其中，H1大于或等于0.02mm，且小于或等于0.04mm；第二连接分部71163的厚度为H2，其中，H2大于或等于0.03mm，且小于或等于0.05mm。第一柔性单元711和第二柔性单元712的厚度均大于或等于0.1mm，且小于或等于0.15mm。因此，第一连接部7113和第二连接部7123处的厚度H3大于或等于0.25mm，且小于或等于0.4mm。相比于通过板对板(board to board，BTB)连接器或者零插入力(Zero inserttion force，ZIF)连接器将第一柔性单元711和第二柔性单元712电连接(厚度均为1.1mm)在一起，本申请实施例提供的FPC 70的厚度较小，不会占用容纳腔体太多的区域，有利于手机100内其他结构的设置。此外，当通过BTB连接器或者ZIF连接器将第一柔性单元711和第二柔性单元712电连接在一起时，为了防止连接器的脱落，还需在连接器上 额外在增加钢片等进行固定，而本申请无需增加钢片等进行固定，这样一来，结构简单，且可以降低成本。
在此情况下，为了确保手机100厚度不增加，参见图18和图19，电池仓80靠近显示面板10的一侧开设有一容纳槽81。该容纳槽81用于容纳第一连接部7113和第二连接部7123。这样一来，在Z轴方向，即便第一连接部7113和第二连接部7123的交叠使得第一连接部7113和第二连接部7123处的厚度在0.25mm到0.4之间，通过容纳槽81对第一连接部7113和第二连接部7123进行容纳，可以完全避免第一连接部7113和第二连接部7123的交叠导致整机厚度增加。
需要说明的是，沿Z轴方向，该容纳槽81可以贯穿电池仓80，也可以不贯穿电池仓80。其中，图18以容纳槽81贯穿电池仓80为例进行的说明。
此外，考虑到容纳槽81设置之后，电池仓80在容纳槽81的位置会有段差。当容纳槽81设置在电池仓80的边缘时，且当手机100受到较大的外力时，例如跌落，电池50的边缘在容纳槽81的边缘造成应力集中，使得电池50的边缘发生形变，可能导致电池50的正负极短路，造成电池安全问题。基于此，继续参见图18，可以通过设置容纳槽81的边缘到电池仓80的侧壁的最近距离为W4，其中，W4大于或等于4mm，即将容纳槽81设置在电池仓80较为中心的位置，这样，可以避免电池50的边缘在容纳槽81的边缘造成应力集中，导致电池50的边缘发生形变。
当采用焊接(例如激光焊接)的方式实现第一柔性单元711的第一走线和第二柔性单元712的第二走线电连接时。为了保证第一柔性单元711和第二柔性单元712之间焊接的平坦度，参见图20和21，第一柔性单元711背离第二柔性单元712的一侧设置有支撑结构74，支撑结构74例如可以固定于中框30上。支撑结构74的设置，可以避免当与显示面板10电连接的第一柔性单元711弯折至显示面板10的背面后再与第二柔性单元712电连接时，显示面板10的背面会设置泡棉等较软的结构，在焊接时，导致焊接不良，影响第一柔性单元711和第二柔性单元712的电连接。
对于支撑结构74的材料，本申请实施例不对支撑结构的材料进行限定，只要可以起到支撑作用即可。示例性的，支撑结构74例如可以包括钢或铜合金等金属材料。
此外，由于激光焊接时的温度较高(高达200℃)，因此，为了防止较高的温度损伤显示面板10，继续参见图20和图21，第一柔性单元711背离第二柔性单元712的一侧设置有隔热结构75，通过隔热结构75对显示面板10进行保护，防止较高的温度损伤显示面板10。
对于隔热结构75的材料，本申请实施例不对隔热结构75的材料进行限定，只要可以防止高温损伤显示面板10即可。示例性的，隔热结构75的材料例如可以为气凝胶等具有隔离高温的材料。
可以理解的是，隔热结构75可以根据FPC 70的焊接场景设置。当与显示面板10电连接的第一柔性单元711弯折至显示面板10的背面后再与第二柔性单元712进行激光焊接时，需要在第一柔性单元711背离第二柔性单元712的一侧设置有隔热结构75。当将第一柔性单元711的一端和第二柔性单元712电连接后，再将第一柔性单元711和第二柔性单元712弯折至显示面板10的背面时，则无需设置隔热结构75。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (19)

  1. 一种柔性电路板，其特征在于，包括：第一柔性单元和第二柔性单元；
    所述第一柔性单元包括第一连接部和多条第一走线，每条所述第一走线包括位于所述第一连接部的焊接点；每个所述焊接点上设置有第一连接结构，且所述焊接点与所述第一连接结构电连接；
    所述第二柔性单元包括第一面和第二面，所述第一面位于所述第二柔性单元背离所述第一柔性单元的一侧；
    所述第二柔性单元还包括第二连接部和多条第二走线；所述第二连接部上开设有多个通孔，多个所述通孔与多条所述第二走线一一对应设置；每个所述通孔侧壁的四周设置有第二连接结构，且所述第二连接结构延伸至所述第一面和所述第二面，且与所述第二走线电连接；
    所述第一连接结构穿过所述通孔，并与所述第二连接结构电连接，以使所述第一柔性单元的第一走线和所述第二柔性单元的第二走线电连接。
  2. 根据权利要求1所述的柔性电路板，其特征在于，所述第一连接结构包括依次连接的第一连接分部、中间分部和第二连接分部；
    所述第一连接分部位于所述第一柔性单元和所述第二柔性单元之间，且与位于所述第二面的所述第二连接结构电连接，所述中间分部位于所述通孔中，与位于所述通孔中的第二连接结构接触并电连接，所述第二连接分部突出于所述第一面，并与位于所述第一面的所述第二连接结构电连接。
  3. 根据权利要求2所述的柔性电路板，其特征在于，所述第一连接结构和所述第二连接结构通过焊接电连接。
  4. 根据权利要求3所述的柔性电路板，其特征在于，沿第一方向，所述第一连接分部的厚度为H1，其中，H1大于或等于0.02mm，且小于或等于0.04mm；所述第二连接分部的厚度为H2，其中，H2大于或等于0.03mm，且小于或等于0.05mm；
    所述第一方向为所述第一连接部指向所述第二连接部的方向。
  5. 根据权利要求1所述的柔性电路板，其特征在于，所述柔性电路板还包括粘合层；所述粘合层位于所述第一连接部和所述第二连接部之间。
  6. 根据权利要求5所述的柔性电路板，其特征在于，所述粘合层环绕多个第一连接结构设置。
  7. 根据权利要求1所述的柔性电路板，其特征在于，所述第一连接部上设置有第一定位结构；
    所述第二连接部上设置有第二定位结构；
    所述第一定位结构和所述第二定位结构在所述第一连接部上的正投影的形状相同或互补。
  8. 根据权利要求7所述的柔性电路板，其特征在于，所述第一定位结构到所述第一连接结构的最近距离为W1，其中，W1大于0.5mm；
    所述第二定位结构到所述通孔的最近距离为W2，其中，W2大于0.5mm。
  9. 根据权利要求7所述的柔性电路板，其特征在于，所述第一定位结构包括定位柱；所述第二定位结构包括定位孔。
  10. 根据权利要求9所述的柔性电路板，其特征在于，所述定位孔到所述第二连接部的边缘的最近距离为W3，其中，W3大于0.5mm。
  11. 根据权利要求9所述的柔性电路板，其特征在于，沿第一方向，所述定位柱的形状包括圆柱、圆锥或圆台；
    沿所述第一方向，所述定位孔的形状与所述定位柱的形状相匹配；
    所述第一方向为所述第一连接部指向所述第二连接部的方向。
  12. 根据权利要求7所述的柔性电路板，其特征在于，所述第一定位结构包括定位柱，所述第二定位结构包括定位槽；
    所述第二柔性单元还包括连接所述第一面和所述第二面的侧面；
    所述定位槽贯穿所述第一面和所述第二面，且所述定位槽的开口位于所述侧面。
  13. 根据权利要求1所述的柔性电路板，其特征在于，所述第一面和所述第二面均包括所述第二走线；且沿第一方向，位于所述第一面的所述第二走线与位于所述第二面的第二走线交叠；
    所述第一方向为所述第一连接部指向所述第二连接部的方向。
  14. 根据权利要求1所述的柔性电路板，其特征在于，所述柔性电路板还包括绝缘层；
    所述第二连接部背离所述第一连接部的一侧设置有所述绝缘层。
  15. 一种电子设备，其特征在于，包括权利要求1-14任一项所述的柔性电路板。
  16. 根据权利要求15所述的电子设备，其特征在于，所述电子设备还包括电池以及容纳所述电池的电池仓；
    所述电池仓靠近所述柔性电路板的一侧开设有容纳槽；
    所述容纳槽用于容纳所述第一连接部和所述第二连接部。
  17. 根据权利要求16所述的电子设备，其特征在于，所述容纳槽的边缘到所述电池仓的侧壁的最近距离为W4，其中，W4大于或等于4mm。
  18. 根据权利要求15所述的电子设备，其特征在于，所述电子设备还包括支撑结构；
    所述支撑结构位于所述第一连接部背离所述第二连接部的一侧。
  19. 根据权利要求15所述的电子设备，其特征在于，所述电子设备还包括隔热结构；
    所述隔热结构位于所述第一连接部背离所述第二连接部的一侧。
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