FFC and terminal branch combined structure adaptive to precision die cutting process

Abstract

The invention discloses an FFC and terminal branch combined structure adaptive to a precision die cutting process, and relates to the technical field of circuit boards, the FFC and terminal branch combined structure comprises an FFC and a terminal branch, the FFC comprises a first insulating film, a second insulating film and a circuit layer, the circuit layer is located between the first insulating film and the second insulating film, and the terminal branch is located between the first insulating film and the second insulating film. The circuit layer comprises a plurality of circuit sections which are arranged at intervals, the first insulating film is provided with a first leakage window hole, the circuit sections are exposed through the first leakage window hole, the terminal branch comprises a first connecting section, a fuse section and a second connecting section which are connected in sequence, the first connecting section is provided with a welding hole, and the fuse section is connected with the second connecting section through the welding hole. The first connecting section is electrically connected with the circuit section at the first leakage window hole through the welding hole, and the second connecting section is used for being electrically connected with external equipment. According to the technical scheme provided by the invention, the branches are added on the FFC to expand more functions, so that the cost is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and in particular to a combined structure of an FFC and a terminal branch adapted to a precision die-cutting process. Background Art

[0002] FFC (Flexible Flat Cable) is widely used in various electronic devices because of its lower price than FPC (Flexible Printed Circuit). However, the existing FFC can only be an end-to-end structure, and cannot branch to achieve more functions. It also cannot achieve the fuse protection function and the battery pack expansion and contraction prevention function, which limits its scope of use. Its performance cannot meet the branching and multi-functional requirements of FPC and FDC. Summary of the invention

[0003] The main purpose of the present invention is to propose a combined structure of FFC and terminal branches adapted to the precision die-cutting process, aiming to add branches to the FFC to expand more functions, reduce costs and improve efficiency.

[0004] To achieve the above-mentioned purpose, the present invention proposes a combined structure of FFC and terminal branches adapted to the precision die-cutting process, including:

[0005] FFC, comprising a first insulating film, a second insulating film and a circuit layer, wherein the circuit layer is located between the first insulating film and the second insulating film, the circuit layer comprises a plurality of circuit segments arranged at intervals, the first insulating film is provided with a first leakage window hole, and the circuit segments are exposed to the outside through the first leakage window hole; and

[0006] The terminal branch includes a first connection section, a fuse section and a second connection section which are connected in sequence, the first connection section is provided with a welding hole, the first connection section is electrically connected to the circuit section at the first leakage window hole through the welding hole, and the second connection section is used to be electrically connected to an external device.

[0007] In one embodiment, the fuse section is located between the first connecting section and the second connecting section.

[0008] In one embodiment, the fuse segment includes a first connecting segment, a curved segment, and a second connecting segment connected in sequence, wherein one end of the first connecting segment away from the curved segment is connected to the first connecting segment, and one end of the second connecting segment away from the curved segment is connected to the second connecting segment, and the projections of the first connecting segment, the curved segment, and the second connecting segment in the width direction of the terminal branch at least partially overlap.

[0009] In one embodiment, the curved segment includes a plurality of first curved segments and a plurality of second curved segments connected to each other, the first curved segments and the second curved segments are alternately arranged one by one, and the width of the first curved segment is greater than the width of the second curved segment.

[0010] In one embodiment, the first connecting section, the fuse section, and the second connecting section are all wrapped with a protective film.

[0011] In one embodiment, the protective film includes a first protective film and a second protective film, the first protective film and the second protective film are respectively bonded to both sides of the first connecting section, the fuse section and the second connecting section, and the welding hole passes through the first protective film and the second protective film.

[0012] In one embodiment, the terminal branch also includes a plurality of connecting bridges, the protective film of the curved segment and the protective film of the first connecting segment are connected via the connecting bridges, and the protective film of the second connecting segment and the protective film of the second connecting segment are connected via another connecting bridge.

[0013] In one embodiment, the width of the connecting bridge is w1, the width of the first connecting section is w2, and 0.5w2≤w1≤2w2.

[0014] In one embodiment, the protective membrane of the connecting bridge, the protective membrane of the first connecting section and the protective membrane of the curved section enclose a first expansion and contraction cavity, and the protective membrane of the connecting bridge, the protective membrane of the second connecting section and the protective membrane of the curved section enclose a second expansion and contraction cavity.

[0015] In one embodiment, the area of ​​the first expansion and contraction cavity is S1, the area of ​​the second expansion and contraction cavity is S2, the area of ​​the region enclosed by the first connecting segment, the second connecting segment, the first connecting segment and the second connecting segment is S3, and S1+S2>2 / 3S3.

[0016] In one embodiment, the welding holes are provided in a plurality of groups at intervals, and each group of the welding holes is provided with a plurality of the welding holes.

[0017] In one embodiment, the first protective film and the second protective film are both provided with the second leakage window holes, and each group of the welding holes corresponds to two of the second leakage window holes.

[0018] In one embodiment, the length of the terminal branch is L, the width of the FFC is w3, and L>1 / 2w3.

[0019] In one embodiment, a cut-off flow hole is provided on the FFC, the cut-off flow hole penetrates the first insulating film, the second insulating film and the circuit layer, and the cut-off flow hole is located downstream of the first leakage window hole.

[0020] In one embodiment, the width of the circuit segment is w4, the distance between two adjacent circuit segments is a, the diameter of the intercepting flow hole is R, and w4<R<w4+2a.

[0021] In one embodiment, the width of the first leakage window is w5, the width of the circuit segment is w4, the interval between two adjacent circuit segments is a, and w5<w4+2a.

[0022] In one embodiment, two copper leakage areas are provided on the first insulating film or the second insulating film, the two copper leakage areas are respectively located at two ends of the circuit layer, and the copper leakage areas extend along the width direction of the first insulating film.

[0023] In the technical solution of the present invention, a first leakage window hole is set on the first insulating film of the FFC, so that the circuit segment at the first leakage window hole is exposed to the outside, and then the first connecting section on the terminal branch is welded to the circuit segment at the first leakage window hole through the welding hole, so that the terminal branch is electrically connected to the circuit segment at the first leakage window hole, thereby facilitating the installation of the terminal branch, and the second connecting section is used to connect an external device, wherein the external device is a battery cell, a control board and other structures that need to be electrically connected in the battery pack; and a plurality of circuit segments are provided on the FFC, therefore, a first leakage window hole can be set on the corresponding circuit segment according to actual needs, and then the terminal branch is welded at the corresponding first leakage window hole, so that one FFC can be connected to a plurality of terminal branches to realize electrical connection to a plurality of battery cells and / or control boards and other structures in the battery pack, thereby realizing adding terminal branches on the FFC to expand more functions, thereby using a low-cost FFC+terminal branch combination structure to realize the branch and multi-functional performance of FPC or FDC. At the same time, by setting a fuse segment between the first connecting segment and the second connecting segment, when the circuit is abnormal, the fuse segment is blown to protect the entire battery pack and FFC, thereby improving the safety of the entire circuit. At the same time, when the fuse segment is blown, only a new terminal branch needs to be replaced to restore the normal operation of the circuit, so there is no need to replace the FFC and the battery pack as a whole. This is simple and convenient, thereby reducing the daily use cost of the FFC and the battery pack, thereby further reducing the cost and improving the disassembly and assembly efficiency of users in daily use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of an embodiment of a combined structure of an FFC and a terminal branch adapted to a precision die-cutting process provided by the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 for Figure 1 Schematic diagram of the structure of the middle terminal branch;

[0028] Figure 4 for Figure 3 Schematic diagram of the structure for removing the upper protective film;

[0029] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0030] Description of Figure Numbers:

[0031] 10. FFC; 11. first insulating film; 12. second insulating film; 13. circuit segment; 14. first leakage window hole; 15. cut-off flow hole; 16. copper leakage area;

[0032] 20. Terminal branch; 21. First connecting section; 22. Second connecting section; 23. Fuse section; 231. First connecting section; 232. Second connecting section; 233. Curved section; 233a. First curved section; 233b. Second curved section; 24. Protective film; 25. Connecting bridge; 261. First expansion and contraction cavity; 262. Second expansion and contraction cavity; 27. Welding hole; 28. Second leak window hole.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Reference Figures 1 to 3 The present invention proposes a combined structure of an FFC 10 and a terminal branch 20 adapted to a precision die-cutting process, comprising:

[0038] FFC10, comprising a first insulating film 11, a second insulating film 12 and a circuit layer, wherein the circuit layer is located between the first insulating film 11 and the second insulating film 12, the circuit layer comprises a plurality of circuit segments 13 arranged at intervals, the first insulating film 11 is provided with a first leakage window hole 14, and the circuit segments 13 are exposed to the outside through the first leakage window hole 14; and

[0039] The terminal branch 20 includes a first connecting section 21, a fuse section 23 and a second connecting section 22 which are connected in sequence. The first connecting section 21 is provided with a welding hole 27. The first connecting section 21 is electrically connected to the circuit section 13 at the first leakage window hole 14 through the welding hole 27. The second connecting section 22 is used to be electrically connected to an external device.

[0040] In the technical solution of the present invention, a first leakage window hole 14 is provided on the first insulating film 11 of the FFC 10, so that the circuit segment 13 at the first leakage window hole 14 is exposed to the outside, and then the first connecting segment 21 on the terminal branch 20 is welded to the circuit segment 13 at the first leakage window hole 14 through the welding hole 27, so that the terminal branch 20 is electrically connected to the circuit segment 13 at the first leakage window hole 14, thereby facilitating the installation of the terminal branch 20, and the second connecting segment 22 is used to connect an external device, wherein the external device is a structure such as a battery cell and a control board that need to be electrically connected in the battery pack; and A plurality of circuit segments 13 are provided on the FFC10, so a first leakage window hole 14 can be provided on the corresponding circuit segment 13 according to actual needs, and then the terminal branch 20 can be welded at the corresponding first leakage window hole 14, so that one FFC10 connected to a plurality of terminal branches 20 can realize electrical connection of a plurality of battery cells and / or control boards and other structures in a battery pack, thereby realizing the expanded functions by adding terminal branches 20 to the FFC10, and thus realizing the branching and multi-functional performance of FPC or FDC using a low-cost FFC10+terminal branch 20 combination structure. At the same time, by setting a fuse segment 23 between the first connecting segment 21 and the second connecting segment 22, when the circuit is abnormal, the fuse segment 23 is melted to protect the entire battery pack and FFC10, thereby improving the safety of the entire circuit. At the same time, after the fuse segment 23 is melted, only a new terminal branch 20 needs to be replaced to restore the normal operation of the circuit, so there is no need to replace the FFC10 and the battery pack as a whole. It is simple and convenient, thereby reducing the daily use cost of FFC10 and the battery pack, thereby further reducing the cost and improving the disassembly and assembly efficiency of users in daily use.

[0041] It should be noted that when replacing a new terminal branch 20, if the original first leakage window hole 14 can still be used to weld the terminal branch 20, then the first leakage window hole 14 can be used to continue welding. If the first leakage window hole 14 at this location cannot be welded due to a break or difficulty in welding, then it is only necessary to open another first leakage window hole 14 upstream of the first leakage window hole 14, and at the same time, the circuit segment 13 at the original abandoned first leakage window hole 14 can be cut off. The first leakage window hole 14 can be opened with a blade, and the circuit board can be cut off with tools such as scissors and pliers, which is simple and convenient, thereby facilitating daily maintenance and replacement, reducing the workload of daily maintenance, and reducing the daily use cost. Of course, it is also possible to increase the number of circuit segments 13, and then open first leakage windows 14 in other circuit segments 13. These circuit segments 13 are used as emergency backup. At the same time, it should be noted that the shape of the second connecting segment 232 can be changed according to the different circuits in the battery pack that need to be connected.

[0042] It is understandable that multiple terminal branches 20 may be welded on one FFC10 at the same time, and the multiple terminal branches 20 will be arranged in parallel. Therefore, if the width of the terminal branch 20 along the length direction of the FFC10 is too large, the terminal branches 20 welded on the same FFC10 will be limited, or the length of the FFC10 needs to be increased to weld more terminal branches 20. Therefore, in one embodiment, the fuse segment 23 is located between the first connecting segment 21 and the second connecting segment 22, thereby reducing the width of the terminal branch 20 along the length direction of the FFC10, so that more terminal branches 20 can be welded on the FFC10 of the same length, which is beneficial to reduce the length of the FFC10, thereby reducing the material cost of the FFC10.

[0043] Reference Figures 3 to 5 Furthermore, the fuse segment 23 includes a first connecting segment 231, a curved segment 233 and a second connecting segment 232 which are connected in sequence, the end of the first connecting segment 231 away from the curved segment 233 is connected to the first connecting segment 21, the end of the second connecting segment 232 away from the curved segment 233 is connected to the second connecting segment 22, the projections of the first connecting segment 231, the curved segment 233 and the second connecting segment 232 in the width direction of the terminal branch 20 at least partially overlap, that is, the first connecting segment 231, the curved segment 233 and the second connecting segment 232 are bent, thereby reducing the length of the terminal branch 20, thereby reducing the space occupied by the terminal branch 20, thereby reducing the space occupied by the line, and thus facilitating miniaturization.

[0044] In one embodiment, the curve segment 233 includes a plurality of first curve segments 233a and a plurality of second curve segments 233b connected to each other, the first curve segments 233a and the second curve segments 233b are alternately arranged one by one, and the width of the first curve segment 233a is greater than the width of the second curve segment 233b. By setting the first curve segments 233a and the second curve segments 233b of different widths, the current distribution in the fuse can be more uniform. In the wider first curve segment 233a, the current density is relatively low. When the current increases abnormally, the narrower second curve segment 233b will heat up faster and reach the fusing temperature due to its larger resistance. Therefore, the fuse of this design can be blown faster when the current is abnormal, thereby protecting the circuit more effectively, so that an excellent fuse can be processed. Further, the first curve segment 233a and the second curve segment 233b are set to be curved so that the fuse can be applied to a more complex line environment, thereby reducing the size occupied by the curve segment 233; at the same time, the fuse of the curved structure helps to disperse stress, especially when subjected to mechanical stress or thermal stress, it is not easy to be damaged. Of course, in other embodiments, the curved segment 233 may also be a straight segment, that is, the fuse segment 23 includes a first connecting segment 231, a straight segment and a second connecting segment 232 connected in sequence, wherein the straight segment includes a first straight segment and a second straight segment connected to each other, and the width of the first straight segment is greater than the width of the second straight segment. By setting the fuse as a straight segment, the processing cost of the fuse is facilitated, thereby reducing the production cost of the fuse.

[0045] At the same time, it should be noted that the connection between the first curved segment 233a and the second curved segment 233b is an arc transition, which facilitates the processing and manufacturing of the curved segment 233 and reduces the risk of breakage at the connection between the first curved segment 233a and the second curved segment 233b due to external force, thereby improving the structural strength of the curved segment 233 and the stability of the fuse segment 23.

[0046] In one embodiment, the first connection section 21, the fuse section 23 and the second connection section 22 are all wrapped with a protective film 24. It can be understood that the first connection section 21, the fuse section 23 and the second connection section 22 are usually made of conductive materials such as tubes and aluminum. Therefore, the protective film 24 can prevent the first connection section 21 from bending and deformation, and at the same time play an insulating role, thereby improving the installation of the terminal branch 20. Among them, the material of the protective film 24 can be polyimide, polyester, polycarbonate, polyethylene, polypropylene, epoxy resin and other materials, which have good insulation performance, heat resistance, chemical corrosion resistance and mechanical strength. At the same time, the cost is low.

[0047] Specifically, the protective film 24 includes a first protective film 24 and a second protective film 24, the first protective film 24 and the second protective film 24 are respectively bonded to the first connection section 21, the fuse section 23 and the second connection section 22, and the welding hole 27 passes through the first protective film 24 and the second protective film 24. By sandwiching the first protective film 24 and the second protective film 24 on both sides of the first connection section 21, the fuse section 23 and the second connection section 22, the bonding of the protective film 24 is facilitated, and the production of the terminal branch 20 is facilitated.

[0048] In one embodiment, the terminal branch 20 also includes a plurality of connecting bridges 25 , the protective membrane 24 of the curved segment 233 and the protective membrane 24 of the first connecting segment 21 are connected via the connecting bridges 25 , and the protective membrane 24 of the second connecting segment 232 and the protective membrane 24 of the second connecting segment 22 are connected via another connecting bridge 25 . It can be understood that, under normal circumstances, the first connecting segment 21 is welded to the circuit segment 13 corresponding to the FFC10, and the second connecting segment 22 is electrically connected to the circuit structure or line structure corresponding to the battery pack. The distance between the first connecting segment 21 and the second connecting segment 22 is exactly the distance between the battery pack and the circuit segment 13 corresponding to the FFC10. However, the battery pack may expand and shrink when the temperature is high or overcharged, and the expansion and contraction range generally does not exceed 3mm. Therefore, the distance between the battery pack and the circuit segment 13 corresponding to the FFC10 will change. At this time, if the distance change range is too large, the fuse segment 23 may be broken. Therefore, the width of the fuse segment 23 is the smallest. Therefore, by setting the connecting bridge 25, when the battery pack expands or shrinks, the connecting bridge 25 is broken, thereby increasing the distance between the first connecting segment 21 and the second connecting segment 22, thereby protecting the fuse segment 23, thereby improving the stability of the terminal branch 20.

[0049] Furthermore, since the fuse segment 23 and the protective film 24 wrapped around it are in the shape of a long strip arranged in multiple sections, the fuse segments 23 between the adjacent two ends are easily bent during transportation or installation. Therefore, different positions of the fuse segment 23 are connected to the protective films 24 of the first connection segment 21 and the second connection segment 22 through the connecting bridge 25, so as to avoid the possibility of the fuse segment 23 being bent, deformed and broken during installation and transportation. Therefore, by providing the connecting bridge 25, the stability and reliability of the fuse segment 23 are improved.

[0050] Specifically, the width of the connecting bridge 25 is w1, the width of the first connecting section 231 is w2, and 0.5w2≤w1≤2w2. It can be understood that if w1>2w2, it will make it difficult for the connecting bridge 25 to break when the battery pack expands or contracts, and then the fuse section 23 will still be torn off when the battery pack expands or contracts, and then the terminal branch 20 will fail. If w1<0.5w2, the width of the connecting bridge 25 will be too small, so that when the user is carrying or installing the terminal branch 20, the connecting bridge 25 may break if the user uses a little too much force, and then the function of the connecting bridge 25 will fail.

[0051] In one embodiment, the protective film 24 of the connecting bridge 25, the protective film 24 of the first connecting section 231, and the protective film 24 of the curved section 233 enclose a first expansion and contraction cavity 261, and the protective film 24 of the connecting bridge 25, the protective film 24 of the second connecting section 232, and the protective film 24 of the curved section 233 enclose a second expansion and contraction cavity 262. It can be understood that by providing the first expansion and contraction cavity 261 and the second expansion and contraction cavity 262, when the connecting bridge 25 is broken, a certain deformation can be generated between the first connecting section 231, the curved section 233, and the second connecting section 232, thereby increasing the distance between the first connecting section 21 and the second connecting section 22, and preventing the fuse section 23 from breaking due to the expansion and contraction of the battery pack.

[0052] Specifically, the area of ​​the first expansion and contraction cavity 261 is S1, the area of ​​the second expansion and contraction cavity 262 is S2, the area of ​​the area enclosed by the first connecting section 21, the second connecting section 22, the first connecting section 231 and the second connecting section 232 is S3, and S1+S2>2 / 3S3. It can be understood that if S1+S2≤2 / 3S3, it means that the area of ​​the first expansion and contraction cavity 261 and the second expansion and contraction cavity 262 is too small, which leads to a small expansion and contraction space for the fuse segment 23 after the connecting bridge 25 is broken, and it is difficult to meet the increase in the distance between the battery pack and the corresponding circuit segment 13 on the FFC10 caused by the expansion and contraction of the battery pack. Therefore, by reasonably setting the area size of the first expansion and contraction cavity 261 and the second expansion and contraction cavity 262, the stability and reliability of the fuse segment 23 are improved.

[0053] Preferably, the welding holes 27 are provided in multiple groups at intervals, and each group of the welding holes 27 is provided with multiple welding holes 27. By providing multiple groups of welding holes 27, when the original welding holes 27 cannot be used after the terminal branch 20 is disassembled, it is only necessary to reselect a new group of welding holes 27 for welding; of course, it is also possible to reselect a new group of welding holes 27 after the initial welding error. Of course, in other embodiments, each group of welding holes 27 has only one welding hole 27, but the welding holes 27 are arranged in a long strip shape to increase the area of ​​the welding holes 27.

[0054] Specifically, the first protective film 24 and the second protective film 24 are both provided with second leakage windows 28, and each group of welding holes 27 corresponds to two second leakage windows 28. The second leakage windows 28 are provided to facilitate welding of the welding holes 27.

[0055] Reference Figure 1 and Figure 2 In one embodiment, the length of the terminal branch 20 is L, the width of the FFC10 is w3, and L>1 / 2w3. It can be understood that if L≤1 / 2w3, when the first connection segment 21 of the terminal branch 20 is welded to the middle circuit segment 13 of the FFC10, the second connection segment 22 of the terminal branch 20 cannot be welded to the circuit structure or circuit structure inside the battery pack.

[0056] In one embodiment, two copper leakage areas 16 are provided on the first insulating film 11 or the second insulating film 12, and the two copper leakage areas 16 are respectively located at the two ends of the circuit layer, and the copper leakage areas 16 extend along the width direction of the first insulating film 11. It can be understood that the FFC10 in the technical solution of the present application is plugged into an external device through the copper leakage areas 16 at both ends, thereby realizing the circuit connection of the devices at both ends of the FFC10, thereby facilitating the installation of the FFC10, which is simple and convenient.

[0057] Specifically, the FFC 10 is provided with a cut-off flow hole 15, which penetrates the first insulating film 11, the second insulating film 12 and the circuit layer, and is located downstream of the first leakage window 14. Since the FFC 10 in the technical solution of the present application is plug-in, if the cut-off flow hole 15 is not provided, the devices at both ends of the FFC 10 will still be connected through the circuit segment 13, which may cause the current at the terminal branch 20 to be too small, thereby affecting the normal operation of the internal circuit of the battery pack.

[0058] Furthermore, the width of the circuit segment 13 is w4, the spacing between two adjacent circuit segments 13 is a, and the diameter of the cut-off flow hole 15 is R, w4<R<w4+2a. It can be understood that if R≥w4+2a, the diameter of the cut-off flow hole 15 will be too large, which will cut off part of the circuit of other circuit segments 13, thereby affecting the operation of other circuits. If R≤w4, the cut-off flow hole 15 will not be able to completely cut off the circuit downstream of the circuit segment 13 at the first leakage window hole 14, resulting in current still passing downstream, which will cause the current in the terminal branch 20 to be too small.

[0059] In one embodiment, the width of the first leakage window 14 is w5, the width of the circuit segment 13 is w4, the spacing between two adjacent circuit segments 13 is a, and w5<w4+2a. If w5≥w4+2a, the first leakage window 14 will expose the adjacent circuit segment 13, and the terminal branch 20 may be welded together with the adjacent circuit segment 13 after welding, thereby affecting the normal operation of the terminal branch 20 and other circuit segments 13, and reducing the stability and reliability of the welding of the terminal branch 20.

[0060] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A combined structure of an FFC (10) and a terminal branch (20) adapted for a precision die-cutting process, characterized in that: include: The FFC (10) comprises a first insulating film (11), a second insulating film (12) and a circuit layer, wherein the circuit layer is located between the first insulating film (11) and the second insulating film (12), the circuit layer comprises a plurality of circuit segments (13) arranged at intervals, a first leakage window hole (14) is provided on the first insulating film (11), and the circuit segments (13) are exposed to the outside through the first leakage window hole (14); and A terminal branch (20), the terminal branch (20) comprising a first connection section (21), a fuse section (23) and a second connection section (22) connected in sequence, the first connection section (21) being provided with a welding hole (27), the first connection section (21) being electrically connected to the circuit section (13) at the first leakage window hole (14) through the welding hole (27), and the second connection section (22) being used for electrically connecting to an external device.

2. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 1, characterized in that: The fuse section (23) is located between the first connecting section (21) and the second connecting section (22).

3. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 1, characterized in that: The fuse section (23) comprises a first connecting section (231), a curved section (233) and a second connecting section (232) which are connected in sequence, wherein one end of the first connecting section (231) away from the curved section (233) is connected to the first connecting section (21), and one end of the second connecting section (232) away from the curved section (233) is connected to the second connecting section (22), and projections of the first connecting section (231), the curved section (233) and the second connecting section (232) in the width direction of the terminal branch (20) at least partially overlap.

4. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 3, characterized in that: The first connecting section (21), the fuse section (23) and the second connecting section (22) are all wrapped with a protective film (24).

5. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 4, characterized in that: The terminal branch (20) further comprises a plurality of connecting bridges (25), the protective membrane (24) of the curved section (233) and the protective membrane (24) of the first connecting section (21) being connected via the connecting bridges (25), and the protective membrane (24) of the second connecting section (232) and the protective membrane (24) of the second connecting section (22) being connected via another connecting bridge (25).

6. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 5, characterized in that: The width of the connecting bridge (25) is w1, the width of the first connecting section (231) is w2, and 0.5w2≤w1≤2w2.

7. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 5, characterized in that: The protective film (24) of the connecting bridge (25), the protective film (24) of the first connecting section (231) and the protective film (24) of the curved section (233) together form a first expansion and contraction cavity (261); the protective film (24) of the connecting bridge (25), the protective film (24) of the second connecting section (232) and the protective film (24) of the curved section (233) together form a second expansion and contraction cavity (262).

8. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 7, characterized in that: The area of ​​the first expansion and contraction cavity (261) is S1, the area of ​​the second expansion and contraction cavity (262) is S2, the area of ​​the region enclosed by the first connecting section (21), the second connecting section (22), the first connecting section (231) and the second connecting section (232) is S3, and S1+S2>2 / 3S3.

9. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process as claimed in claim 1, characterized in that: The length of the terminal branch (20) is L, the width of the FFC (10) is w3, and L>1 / 2w3.

10. The combined structure of the FFC (10) and the terminal branch (20) adapted for the precision die-cutting process according to claim 1, characterized in that: The FFC (10) is provided with a cut-off flow hole (15), the cut-off flow hole (15) penetrates the first insulating film (11), the second insulating film (12) and the circuit layer, and the cut-off flow hole (15) is located downstream of the first leakage window hole (14).

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