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

Abstract

The utility model discloses a combined structure of an FFC and a terminal branch adapted to a precision die cutting technology, and relates to the technical field of circuit boards, the combined structure comprises the FFC and the terminal branch, the FFC comprises a first insulating film, a second insulating film and a circuit layer, the circuit layer is arranged between the first insulating film and the second insulating film, and the terminal branch is arranged 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 utility model, 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] This utility model relates to the technical field of circuit boards, and in particular to a combination structure of FFC and terminal branches adapted to precision die-cutting process. Background Technology

[0002] Flexible Flat Cable (FC) is widely used in various electronic devices due to its lower cost compared to Flexible Printed Circuit (FPC). However, existing FFCs are limited to end-to-end structures, unable to branch to achieve more functions, and cannot provide fuse protection or battery pack expansion / contraction protection, thus restricting their application scope and performance compared to FPCs and Flexible DC cables, which can meet the requirements for branching and multi-functionality. Utility Model Content

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

[0004] To achieve the above objectives, the present invention proposes a combined structure of FFC and terminal branches adapted to precision die-cutting processes, comprising:

[0005] An FFC (Fluidized Composite Film) comprises a first insulating film, a second insulating film, and a circuit layer. The circuit layer is located between the first and second insulating films. The circuit layer includes a plurality of spaced-apart circuit segments. The first insulating film has a first perforation, through which the circuit segments are exposed.

[0006] The terminal branch includes a first connecting segment, a fuse segment, and a second connecting segment connected in sequence. The first connecting segment has a welding hole and is electrically connected to the circuit segment at the first vent hole through the welding hole. The second connecting segment is used for electrical connection with external equipment.

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

[0008] In one embodiment, the fuse segment includes a first connecting segment, a curved segment, and a second connecting segment connected in sequence. The end of the first connecting segment away from the curved segment is connected to the first connecting segment, and the end of the second connecting segment away from the curved segment is connected to the second connecting segment. 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 curve segment includes a plurality of connected first curve segments and a plurality of second curve segments, wherein the first curve segments and the second curve segments are alternately arranged, and the width of the first curve segment is greater than the width of the second curve segment.

[0010] In one embodiment, the first connecting segment, the fuse segment, and the second connecting segment are all covered 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 being respectively adhered to both sides of the first connecting segment, the fuse segment and the second connecting segment, and the welding hole penetrating through the first protective film and the second protective film.

[0012] In one embodiment, the terminal branch further includes multiple connecting bridges, wherein the protective film of the curved segment and the protective film of the first connecting segment are connected by the connecting bridges, and the protective film of the second connecting segment and the protective film of the second connecting segment are connected by another connecting bridge.

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

[0014] In one embodiment, the protective membrane of the connecting bridge, the protective membrane of the first connecting segment, and the protective membrane of the curved segment enclose a first expansion cavity, and the protective membrane of the connecting bridge, the protective membrane of the second connecting segment, and the protective membrane of the curved segment enclose a second expansion 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, and 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, where S1 + S2 > 2 / 3S3.

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

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

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

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

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

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

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

[0023] In this invention, a first perforated window is provided on the first insulating film of the FFC, exposing the circuit segment at the first perforated window. Then, a first connecting segment on the terminal branch is soldered to the circuit segment at the first perforated window through a soldering hole, thus electrically connecting the terminal branch to the circuit segment at the first perforated window. This facilitates the installation of the terminal branch. The second connecting segment is used to connect external devices, such as battery cells and control boards within the battery pack that require electrical connection. Since the FFC has multiple circuit segments, first perforated windows can be provided on corresponding circuit segments according to actual needs, and terminal branches can be soldered at the corresponding first perforated windows. This allows multiple terminal branches connected to a single FFC to electrically connect multiple battery cells and / or control boards within the battery pack. This enables the addition of terminal branches to the FFC to expand its functionality, achieving the branching and multi-functionality of an FPC or FDC using a low-cost FFC + terminal branch combination structure. Meanwhile, by setting a fuse segment between the first and second connection segments, the entire battery pack and FFC are protected by blowing the fuse segment when the circuit is abnormal, thereby improving the safety of the entire circuit. After the fuse segment blows, 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 entire FFC and battery pack. This is simple and convenient, thereby reducing the daily use cost of the FFC and battery pack, further reducing costs, and improving the disassembly and assembly efficiency for users in daily use. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of an embodiment of the combination structure of FFC and terminal branches adapted to precision die-cutting process provided by this utility model;

[0026] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

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

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

[0029] Figure 5 for Figure 4 A magnified view of a section at point B.

[0030] Explanation of icon numbers:

[0031] 10. FFC; 11. First insulating film; 12. Second insulating film; 13. Circuit segment; 14. First vent hole; 15. Through-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 membrane; 25. Connecting bridge; 261. First expansion and contraction cavity; 262. Second expansion and contraction cavity; 27. Welding hole; 28. Second vent hole.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Reference Figures 1 to 3 This utility model proposes a combined structure of FFC10 and terminal branch 20 adapted to precision die-cutting process, including:

[0038] FFC10 includes a first insulating film 11, a second insulating film 12, and a circuit layer. The circuit layer is located between the first insulating film 11 and the second insulating film 12. The circuit layer includes a plurality of circuit segments 13 spaced apart. The first insulating film 11 has a first perforation 14 through which the circuit segments 13 are exposed.

[0039] Terminal branch 20 includes a first connecting section 21, a fuse section 23 and a second connecting section 22 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 vent hole 14 through the welding hole 27. The second connecting section 22 is used for electrical connection with external equipment.

[0040] In the technical solution of this utility model, a first window hole 14 is provided on the first insulating film 11 of FFC10, so that the circuit segment 13 at the first window hole 14 is exposed. Then, the first connecting segment 21 on the terminal branch 20 is welded to the circuit segment 13 at the first 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 window hole 14, thereby facilitating the installation of the terminal branch 20. The second connecting segment 22 is used to connect external devices, wherein the external devices are structures such as battery cells and control boards that need to be electrically connected in the battery pack. The FFC10 has multiple circuit segments 13. Therefore, according to actual needs, a first vent hole 14 can be set on the corresponding circuit segment 13, and then a terminal branch 20 can be welded at the corresponding first vent hole 14. Thus, a single FFC10 can be connected to multiple terminal branches 20 to electrically connect multiple cells and / or control boards in the battery pack. This enables the addition of terminal branches 20 to the FFC10 to expand its functions. In this way, the branching and multi-functional performance of the FPC or FDC can be achieved using a low-cost combination structure of FFC10 + terminal branches 20. Meanwhile, by setting a fuse segment 23 between the first connection segment 21 and the second connection segment 22, the fuse segment 23 is blown when the circuit is abnormal, thereby protecting the entire battery pack and FFC10 and improving the safety of the entire circuit. After the fuse segment 23 blows, only a new terminal branch 20 needs to be replaced to restore the normal operation of the circuit, so that the entire FFC10 and battery pack do not need to be replaced. This is simple and convenient, thereby reducing the daily use cost of FFC10 and battery pack, further reducing costs 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 vent hole 14 can still be used for soldering the terminal branch 20, then the first vent hole 14 can be used for soldering. If the first vent hole 14 cannot be used for soldering due to breakage or difficulty in soldering, then it is only necessary to open another first vent hole 14 upstream of the original first vent hole 14, and at the same time, cut off the circuit segment 13 at the original discarded first vent hole 14. Opening the first vent hole 14 only requires a blade, and cutting the circuit board only requires scissors, pliers, or other tools, which is simple and convenient, thereby facilitating daily maintenance and replacement, reducing the workload of daily maintenance, and lowering daily operating costs. Of course, it is also possible to increase the number of circuit segments 13 and then open first vent holes 14 in other circuit segments 13, which can be used as backups in emergencies. It should also 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] Understandably, multiple terminal branches 20 may be soldered simultaneously on an FFC10. In this case, the multiple terminal branches 20 will be arranged side by side. Therefore, if the width of the terminal branch 20 along the length direction of the FFC10 is too large, it will limit the number of terminal branches 20 that can be soldered on the same FFC10, or the length of the FFC10 needs to be increased to solder 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. This allows more terminal branches 20 to be soldered on an FFC10 of the same length, which in turn helps to reduce the length of the FFC10 and thus reduces 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 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, and 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, and thus reducing the space occupied by the circuit, which is conducive to miniaturization.

[0044] In one embodiment, the curved segment 233 includes multiple connected first curved segments 233a and multiple second curved segments 233b, which are alternately arranged. The width of the first curved segment 233a is greater than the width of the second curved segment 233b. By setting the first curved segments 233a and second curved segments 233b with different widths, the current distribution in the fuse is made more uniform. In the wider first curved segment 233a, the current density is relatively low. When the current abnormally increases, the narrower second curved segment 233b, due to its higher resistance, heats up faster and reaches the melting temperature. Therefore, the fuse designed in this way can melt faster when the current is abnormal, thus protecting the circuit more effectively and producing a high-quality fuse. Furthermore, setting the first curved segments 233a and second curved segments 233b to be curved allows the fuse to be used in more complex circuit environments, thereby reducing the size occupied by the curved segment 233. At the same time, the curved structure of the fuse helps to disperse stress, especially making it less prone to damage under mechanical or thermal stress. Of course, in other embodiments, the curved segment 233 can also be a straight segment, that is, the fuse segment 23 includes a first connected segment 231, a straight segment and a second connected segment 232 connected in sequence. The straight segment includes a first straight segment and a second straight segment connected in sequence. 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] Meanwhile, it should be noted that the connection between the first curved segment 233a and the second curved segment 233b is a rounded 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 thus improving the stability of the fuse segment 23.

[0046] In one embodiment, the first connecting segment 21, the fuse segment 23, and the second connecting segment 22 are all covered with a protective film 24. Understandably, the first connecting segment 21, the fuse segment 23, and the second connecting segment 22 are typically made of conductive materials such as tubing or aluminum. Therefore, the protective film 24 prevents the first connecting segment 21 from bending and deforming, while also providing insulation, thereby improving the installability of the terminal branch 20. The protective film 24 can be made of materials such as polyimide, polyester, polycarbonate, polyethylene, polypropylene, or epoxy resin, which possess good insulation properties, heat resistance, chemical corrosion resistance, and mechanical strength, while also being relatively inexpensive.

[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 adhered to both sides of the first connecting section 21, the fuse section 23, and the second connecting section 22. The welding hole 27 penetrates 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 between both sides of the first connecting section 21, the fuse section 23, and the second connecting section 22, the adhesion of the protective film 24 is facilitated, thereby facilitating the production and manufacturing of the terminal branch 20.

[0048] In one embodiment, the terminal branch 20 further includes a plurality of connecting bridges 25, wherein the protective film 24 of the curved segment 233 and the protective film 24 of the first connecting segment 21 are connected by the connecting bridges 25, and the protective film 24 of the second connecting segment 232 and the protective film 24 of the second connecting segment 22 are connected by another connecting bridge 25. Under normal circumstances, the first connecting segment 21 is soldered to the circuit segment 13 corresponding to FFC10, and the second connecting segment 22 is electrically connected to the circuit structure or wiring 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 FFC10. However, the battery pack may expand or contract under conditions such as high temperature or overcharging. Generally, the expansion or contraction range will not exceed 3mm. Therefore, the distance between the battery pack and the circuit segment 13 corresponding to FFC10 will change. If the distance change range is too large, it may break the fuse segment 23. Therefore, the width of the fuse segment 23 is the smallest. Therefore, by setting the connecting bridge 25, when the battery pack expands or contracts, the connecting bridge 25 is broken, thereby increasing the distance between the first connecting segment 21 and the second connecting segment 22, thus protecting the fuse segment 23 and improving the stability of the terminal branch 20.

[0049] Furthermore, since the fuse segment 23 and the protective film 24 surrounding it are in the form of a long strip with multiple segments, the fuse segments 23 between adjacent ends are prone to bending during handling or installation. Therefore, the connecting bridge 25 connects different positions of the fuse segment 23 to the protective film 24 of the first connecting segment 21 and the second connecting segment 22, thereby avoiding the possibility of the fuse segment 23 breaking due to continuous bending deformation during installation and handling. Therefore, by setting 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, and the width of the first connecting segment 231 is w2, where 0.5w2 ≤ w1 ≤ 2w2. Understandably, if w1 > 2w2, the connecting bridge 25 will be difficult to break when the battery pack expands or contracts, potentially causing the fuse segment 23 to break and the terminal branch 20 to fail. If w1 < 0.5w2, the width of the connecting bridge 25 will be too small, meaning that even slight excessive force applied during handling or installation of the terminal branch 20 could cause it to break, thus rendering the connecting bridge 25 ineffective.

[0051] In one embodiment, the protective film 24 of the connecting bridge 25, the protective film 24 of the first connecting segment 231, and the protective film 24 of the curved segment 233 enclose to form 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 segment 232, and the protective film 24 of the curved segment 233 enclose to form a second expansion and contraction cavity 262. Understandably, by providing the first expansion and contraction cavity 261 and the second expansion and contraction cavity 262, a certain degree of deformation can still occur between the first connecting segment 231, the curved segment 233, and the second connecting segment 232 after the connecting bridge 25 breaks, thereby increasing the distance between the first connecting segment 21 and the second connecting segment 22 and preventing the fuse segment 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, and the area of ​​the region enclosed by the first connecting segment 21, the second connecting segment 22, the first connecting segment 231, and the second connecting segment 232 is S3, where S1 + S2 > 2 / 3S3. Understandably, if S1 + S2 ≤ 2 / 3S3, it indicates that the areas of the first expansion and contraction cavity 261 and the second expansion and contraction cavity 262 are too small. This results in a smaller expansion and contraction space for the fuse segment 23 after the connecting bridge 25 breaks, making it difficult to accommodate the increased distance between the battery pack and the corresponding circuit segment 13 on the FFC10 due to battery pack expansion and contraction. Therefore, by reasonably setting the area 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 arranged in multiple groups at intervals, and each group of welding holes 27 has 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 select a new group of welding holes 27 for welding; of course, it is also possible to select a new group of welding holes 27 after an initial welding error. Of course, in other embodiments, each group of welding holes 27 has only one welding hole 27, but the welding hole 27 is arranged in an elongated shape to increase the area of ​​the welding hole 27.

[0054] Specifically, both the first protective film 24 and the second protective film 24 are provided with second perforated holes 28, and each group of welding holes 27 corresponds to two second perforated holes 28. By providing second perforated holes 28, welding of the welding holes 27 is facilitated.

[0055] Reference Figure 1 and Figure 2 In one embodiment, the length of the terminal branch 20 is L, and the width of the FFC10 is w3, where L > 1 / 2 w3. It is understood that if L ≤ 1 / 2 w3, the second connection segment 22 of the terminal branch 20 will be unable to be soldered to the internal wiring or circuit structure of the battery pack when the first connecting segment 21 of the terminal branch 20 is soldered to the circuit segment 13 in the middle of the FFC10.

[0056] In one embodiment, the first insulating film 11 or the second insulating film 12 is provided with two copper leakage areas 16, which are respectively located at both 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 this application is connected to an external device through the copper leakage areas 16 at both ends, thereby realizing the circuit connection between the devices at both ends of the FFC10, which facilitates the installation of the FFC10 and is simple and convenient.

[0057] Specifically, the FFC10 is provided with a flow-blocking 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 vent hole 14. Since the FFC10 in this application is plug-in, if the flow-blocking hole 15 is not provided, the devices at both ends of the FFC10 will still be connected through the circuit segment 13, which may result in insufficient current at the terminal branch 20, thereby affecting the normal operation of the internal circuitry of the battery pack.

[0058] Furthermore, the width of the circuit segment 13 is w4, the distance between two adjacent circuit segments 13 is a, and the diameter of the flow-blocking orifice 15 is R, where w4 < R < w4 + 2a. Understandably, if R ≥ w4 + 2a, the diameter of the flow-blocking orifice 15 will be too large, thus cutting off part of the circuit in other circuit segments 13 and affecting the operation of other circuits. If R ≤ w4, the flow-blocking orifice 15 will not be able to completely cut off the circuit downstream of the circuit segment 13 at the first vent hole 14, resulting in current still flowing downstream and thus causing the current in the terminal branch 20 to be too small.

[0059] In one embodiment, the width of the first vent hole 14 is w5, the width of the circuit segment 13 is w4, and the distance between two adjacent circuit segments 13 is a, where w5 < w4 + 2a. If w5 ≥ w4 + 2a, the first vent hole 14 will expose the adjacent circuit segment 13, which may cause the terminal branch 20 to be soldered together with the adjacent circuit segment 13 after soldering, thereby affecting the normal operation of the terminal branch 20 and other circuit segments 13, and thus reducing the stability and reliability of the soldering of the terminal branch 20.

[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A combination structure of a FFC (10) and a terminal branch (20) adapted to a precision die cutting process, characterized by, The application relates to a terminal branch (20) of a fuse link (10) and a fuse link (10) comprising the terminal branch (20). The terminal branch (20) comprises a first connecting section (21), a fuse section (23) and a second connecting section (22) connected in sequence, the first connecting section (21) is provided with a welding hole (27), the first connecting section (21) is electrically connected with the circuit section (13) at the first leakage window hole (14) through the welding hole (27), and the second connecting section (22) is used for being electrically connected with external equipment. The fuse section (23) is located between the first connecting section (21) and the second connecting section (22). The fuse section (23) comprises a first communication section (231), a curved section (233) and a second communication section (232) connected in sequence, one end of the first communication section (231) away from the curved section (233) is connected to the first connecting section (21), one end of the second communication section (232) away from the curved section (233) is connected to the second connecting section (22), and the projections of the first communication section (231), the curved section (233) and the second communication section (232) in the width direction of the terminal branch (20) at least partially overlap.

2. The combination of FFC (10) adapted to a precision die-cutting process and terminal branch (20) as claimed in claim 1, 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).

3. The combination of FFC (10) adapted to a precision die-cutting process and terminal branch (20) as claimed in claim 1, wherein, The terminal branch (20) further comprises a plurality of connecting bridges (25), the protective film (24) of the curved section (233) and the protective film (24) of the first connecting section (21) are connected through the connecting bridges (25), and the protective film (24) of the second communication section (232) and the protective film (24) of the second connecting section (22) are connected through another connecting bridge (25).

4. The combination of FFC (10) adapted to the precision die-cutting process and terminal branch (20) according to claim 3, characterized in that, The width of the connecting bridge (25) is w1, the width of the first communication section (231) is w2, and 0.5w2<=w1<=2w2.

5. The combination of a FFC (10) adapted to a precision die-cutting process and a terminal branch (20) according to claim 4, characterized in that, The protective film (24) of the connecting bridge (25), the protective film (24) of the first communication section (231) and the protective film (24) of the curved section (233) form a first expansion cavity (261), and the protective film (24) of the connecting bridge (25), the protective film (24) of the second communication section (232) and the protective film (24) of the curved section (233) form a second expansion cavity (262).

6. The combination of a FFC (10) adapted to a precision die-cutting process and a terminal branch (20) according to claim 5, characterized in that, ​ 7. The combination structure of the FFC (10) adapted to the precision die cutting process and the terminal branch (20) according to claim 5, characterized by, ​ 8. The combination of a FFC (10) adapted to a precision die-cutting process and a terminal branch (20) according to claim 7, characterized in that, The first expansion cavity (261) has an area S1, the second expansion cavity (262) has an area S2, and the first connecting section (21), the second connecting section (22), the first communication section (231), and the second communication section (232) enclose an area S3, S1+S2>2 / 3S3.

9. The combination structure of FFC (10) and terminal branch (20) adapting the precision die cutting process as claimed in claim 1, wherein, The length of the terminal branch (20) is L, and the width of the FFC (10) is w3, L>1 / 2w3.

10. The combination structure of FFC (10) and terminal branch (20) adapting a precision die cutting process according to claim 1, characterized by, The FFC (10) is provided with a through hole (15) for cutting off current, the through hole (15) penetrates the first insulating film (11), the second insulating film (12), and the circuit layer, and the through hole (15) is located downstream of the first leakage window hole (14).

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