Welded FPC (Flexible Printed Circuit) flat cable

Abstract

The utility model discloses a welding type FPC (Flexible Printed Circuit) flat cable, which comprises a bottom FPC flat cable and an upper layer FPC flat cable, a plurality of rows of bottom bonding pads are arranged in the connecting part of the bottom FPC flat cable, the bottom bonding pads are transversely arranged at intervals, single surfaces of the bottom bonding pads are exposed, and first printed wires of the bottom FPC flat cable are not arranged in longitudinal interval intervals of all the bottom bonding pads. The two longitudinal ends of each row of bottom bonding pads in the connecting part are respectively provided with a fixed welding foot. The welding part and the connecting part of the upper-layer FPC flat cable are arranged oppositely, the welding part is internally provided with upper-layer bonding pads which are arranged oppositely to the plurality of rows of bottom bonding pads and have two exposed surfaces, and the longitudinal interval of all the upper-layer bonding pads is not provided with a second printed wire of the upper-layer FPC flat cable; fixing welding holes matched with the corresponding fixing welding pins are formed in the two longitudinal ends of each row of upper-layer bonding pads in the welding part, the transverse extending width of the upper-layer bonding pads is smaller than the width of the bottom bonding pads, the fixing welding pins are welded to the corresponding fixing welding holes, the upper-layer bonding pads are welded to the corresponding bottom bonding pads, and therefore the welding type FPC flat cable is formed.

Description

Technical Field

[0001] This utility model relates to the field of battery pack data acquisition harness processing technology, and in particular to welded FPC cables. Background Technology

[0002] In related technologies, power batteries need to be connected to CCS integrated busbars using FPC cables. The corresponding FPC cables are often made by splicing two parts together to meet the requirements of different connection structures. Some technologies use connectors on the FPC for mating, while others use hotbar soldering. Using connectors increases the cost of the FPC cable and requires compatibility with a PCB panel; therefore, most related technologies use hotbar soldering to produce FPC cables.

[0003] In related technologies, FPC cables using hotbar soldering have the following shortcomings: First, the solder joints of each FPC sub-cable are not firmly soldered and are prone to delamination and tearing; second, the traces between the solder pads of the FPC sub-cables are easily crushed, damaged, or burned during soldering, resulting in a high defect rate of the produced FPC cables; third, multiple soldering operations are required, making the processing difficult and inefficient.

[0004] There is currently no effective solution to the problems of weak welding, easy burn-in and breakage of circuits, and low processing efficiency in existing related technologies for welded FPC cables. Utility Model Content

[0005] In view of this, it is necessary to provide a welded FPC cable to at least solve the problems of weak welding, easy burning and breakage of circuits, and low processing efficiency of related welded FPC cables.

[0006] The present invention adopts the following technical solution: a solderable FPC cable, comprising a bottom FPC cable and an upper FPC cable. The connecting portion of the bottom FPC cable has multiple rows of horizontally spaced, single-sided exposed bottom pads. No first printed traces of the bottom FPC cable are provided within the longitudinal spacing of any of the bottom pads. Fixed solder feet are provided at both ends of the longitudinal direction of each row of bottom pads within the connecting portion. The soldering portion of the upper FPC cable is directly opposite the connecting portion, and the soldering portion contains upper pads that are directly opposite the multiple rows of bottom pads and exposed on both sides. No second printed trace of the upper FPC cable is set in the longitudinal interval of the upper pad. Each row of upper pads in the welding section has a fixing hole at both ends in the longitudinal direction that matches the corresponding fixing pin. The width of the upper pad extending laterally is shorter than the width of the bottom pad. After the bottom FPC cable is stacked with the upper FPC cable and the fixing pin is aligned with the corresponding fixing hole, the fixing pin is soldered to the corresponding fixing hole, and the upper pad is soldered to the corresponding bottom pad to form the welded FPC cable.

[0007] In some embodiments, the upper pad has a U-shaped groove at the end away from the connection with the second printed trace, and the upper pad has a through solder via.

[0008] In some embodiments, the upper pad is provided with a via near the end connected to the second printed trace, which has tinned connections to the upper and lower surfaces of the upper pad.

[0009] In some embodiments, the connecting portion and the welding portion are further bonded by adhesive tape, wherein the adhesive tape is disposed within the lateral spacing between two adjacent rows of bottom pads and two adjacent rows of upper pads.

[0010] In some embodiments, the width of the lateral spacing interval is 12mm to 15mm.

[0011] In some embodiments, the width of the longitudinal spacing between the bottom pad and the upper pad is 1 mm to 1.2 mm.

[0012] In some embodiments, at least two positioning holes are provided on the periphery of both the connecting portion and the welding portion.

[0013] In some embodiments, the welded portion of the upper FPC cable is coated with a UV-protective adhesive layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This application provides a solderable FPC cable, including a bottom FPC cable and an upper FPC cable. The connecting part of the bottom FPC cable has multiple rows of horizontally spaced bottom pads that are exposed on one side. No first printed traces of the bottom FPC cable are provided within the longitudinal spacing intervals of all the bottom pads. Fixed solder feet are provided at both ends of the longitudinal direction of each row of bottom pads in the connecting part. The soldering part of the upper FPC cable is directly opposite the connecting part, and the soldering part has upper pads that are directly opposite the multiple rows of bottom pads and exposed on both sides. No second printed traces of the upper FPC cable are provided within the longitudinal spacing intervals of all the upper pads. Each row of upper pads in the soldering part has fixed solder feet at both ends that are adapted to the corresponding fixed solder feet. The fixed solder holes are provided, and the width of the upper solder pad extending laterally is shorter than the width of the bottom solder pad. Fixed solder feet and fixed solder holes are correspondingly set above and below each row of bottom and upper solder pads. The fixed solder feet and fixed solder holes work together to ensure a robust and tear-resistant overall structure for the bottom and upper FPC cables, resulting in good welding performance. There are no traces within the longitudinal intervals between adjacent solder pads, preventing short circuits, breakage, and solder burns. By making the width of the upper solder pad extending laterally shorter than the width of the bottom solder pad, a portion of the bottom solder pad is exposed relative to the upper solder pad. During welding, the solder overlaps between the bottom and upper solder pads, resulting in a strong weld without any cold solder joints or false solder joints. The solder pads are set in multiple rows, and welding one row at a time improves welding efficiency, solving the problems of weak welding, easy burn-out, breakage, and low processing efficiency associated with related welded FPC cables. Attached Figure Description

[0015] Figure 1 This is a perspective view of an embodiment of this application;

[0016] Figure 2 This is a partial exploded view of an embodiment of this application;

[0017] Figure 3 This is a planar perspective view of the upper-layer FPC cabling in an embodiment of this application;

[0018] Figure 4 yes Figure 3 Enlarged diagram of section A in the middle;

[0019] Figure 5 This is a schematic diagram of a planar perspective display according to an embodiment of this application;

[0020] Figure 6 yes Figure 5 Enlarged schematic diagram of section B in the middle.

[0021] Attached Figure

[0022] 100. Bottom FPC cable; 101. Connector; 11. Bottom pad; 12. First printed trace; 13. Fixing solder pad;

[0023] 200. Upper FPC cable; 201. Soldering section; 21. Upper pad; 22. Second printed circuit trace; 23. Fixed solder hole; 211. U-groove; 212. Through hole; 213. Via;

[0024] 300. Positioning hole. Detailed Implementation

[0025] 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 protection scope of the present utility model.

[0026] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] See Figures 1 to 4This application provides a solderable FPC cable, including a bottom FPC cable 100 and an upper FPC cable 200. The bottom FPC cable 100 has multiple rows of horizontally spaced, single-sided exposed bottom pads 11 within its connecting portion 101. No first printed traces 12 of the bottom FPC cable 100 are provided within the longitudinal spacing of any of the bottom pads 11. Each row of bottom pads 11 within the connecting portion 101 has fixed solder feet 13 at both ends of its longitudinal direction. The upper FPC cable 200... The soldering part 201 and the connecting part 101 are positioned opposite each other. The soldering part 201 contains upper pads 21 that are positioned opposite multiple rows of bottom pads 11 and exposed on both sides. No second printed traces 22 of the upper FPC cable 200 are provided within the longitudinal intervals of any of the upper pads 21. Each row of upper pads 21 within the soldering part 201 has fixing holes 23 at both ends of its longitudinal direction that mate with the corresponding fixing feet 13. The lateral width of the upper pads 21 is shorter than the width of the bottom pads 11.

[0029] After stacking the bottom FPC cable 100 with the upper FPC cable and connecting the fixed solder feet 13 with the corresponding fixed solder holes 23, the fixed solder feet 13 are soldered to the corresponding fixed solder holes 23, and the upper solder pad 21 is soldered to the corresponding bottom solder pad 11 to form a soldered FPC cable.

[0030] In the aforementioned welded FPC cable, fixed solder feet 13 and fixed solder holes are correspondingly set on the bottom pad 11 and the upper pad 21 of each row. Through the cooperation of the fixed solder feet and fixed solder holes, the overall structure of the bottom FPC cable and the upper FPC cable is strong and tear-resistant, and the welding effect is good. There are no traces in the longitudinal interval between adjacent pads, which can avoid short circuits, breakage, and welding burns. By extending the width of the upper pad 21 laterally shorter than the width of the bottom pad 11, the bottom pad 11 exposes part of the pad on the side opposite to the upper pad 21. During welding, the solder overlaps between the bottom pad 11 and the upper pad 21, and there are no cold solder joints or false solder joints, resulting in a strong weld. The pads are set in multiple rows, and the welding efficiency is improved by welding one row at a time. This solves the problems of weak welding, easy burns and breakage of traces, and low processing efficiency in related welded FPC cables.

[0031] It should be noted that when the bottom FPC cable 100 is equipped with bottom pads 11, the bottom pads 11 are exposed on the upper surface of the bottom FPC cable. This means that windows are created at the bottom pads 11 in each row to allow soldering and bonding with the upper pads 21. Simultaneously, when the upper PFC cable 200 is equipped with upper pads 21, the upper pads 21 are exposed on both the upper and lower bottom surfaces of the upper FPC cable. This means that slots are created on the upper and lower bottom surfaces at the location of each row of upper pads 21. The lower bottom surface is used for soldering between the upper pads 21 and the bottom pads 11, and the upper bottom surface is used for brazing. Essentially, windows are created on the upper FPC cable 200. The size of the window is greater than the width of the horizontal extension of the upper pad 21, and the corresponding window size is not less than the width of the horizontal extension of the lower pad 11, so that the lower pad 11 is exposed to the side relative to the upper pad 21, which facilitates soldering with the upper pad 21 after soldering. It should also be noted that there are no corresponding traces between the pads in the same row. The first printed trace 12 and the second printed trace 22 both extend along one side of the setting direction (horizontal) of the corresponding pad and then are routed on the corresponding FPC cable. In this way, the solder head is not directly pressed on the corresponding trace during soldering, and the trace will not be broken or burned, reducing the risk of short circuit or open circuit.

[0032] For easier tinning and exhaust, please refer to... Figures 1 to 6 In some embodiments, the upper pad 21 has a U-shaped groove 211 at the end away from the connection with the second printed trace 22, and the upper pad 21 has a through solder via 212.

[0033] Understandably, with this setup, the solder paste on the upper pad 21 is guided by the solder through the ...

[0034] To improve the reliability of the soldering connection between the upper pad 21 and the lower pad 11, refer to Figures 1 to 6 In some embodiments, the upper pad 21 is provided with a via 213 near the end connected to the second printed trace 22, which has tinned connection to the upper and lower end faces of the upper pad 21.

[0035] It is understandable that this configuration, by setting a via 213 on one side near the second printed trace 22, electrically connects the upper and lower end faces of the upper pad 21. When a cold solder joint, false solder joint, or detachment occurs at the solder joint (opposite end face) between the upper pad 21 and the lower pad 11, the solder on the lower pad 11 will climb from its exposed side to the upper end face of the upper pad 21, and then connect to the lower end face of the upper pad 21. In this way, the upper pad 21 and the lower pad 11 are always electrically connected, improving the reliability of the solder joint between the upper pad and the lower pad 11.

[0036] To prevent the upper FPC cable 200 from tearing and falling off from the lower FPC cable 100, in some embodiments, the connecting part 101 and the soldering part 201 are also bonded by adhesive tape (not shown in the figure), wherein the adhesive tape is disposed in the lateral interval between two adjacent rows of bottom pads 11 and two adjacent rows of upper pads 21.

[0037] In this embodiment, double-sided adhesive is applied in the lateral interval between two adjacent rows of bottom pads 11 and two adjacent rows of top pads 21, i.e., the row interval, to bond and fix the upper FPC cable 200 and the bottom FPC cable 100, preventing the two FPC cables from tearing and delaminating.

[0038] To avoid mutual interference between adjacent rows of pads during single-row soldering, in some embodiments, the width of the lateral spacing between two adjacent bottom pads 11 and two adjacent top pads 21 is set to 12mm to 15mm; in this embodiment, 12mm is preferred.

[0039] To avoid the generation of solder dross, solder balls, and condensation within the FPC cable, in some embodiments, the width of the longitudinal spacing between the bottom pad 11 and the upper pad 21 is 1 mm to 1.2 mm.

[0040] In this embodiment, the so-called longitudinal spacing interval refers to the distance between two adjacent pads, rather than the row spacing; at the same time, in this embodiment, the width of the longitudinal spacing interval is preferably 1mm, that is, the distance between pads in the same row is 1mm.

[0041] Understandably, this setup avoids the formation of solder dross and solder balls between the pads during soldering by setting a smaller spacing. At the same time, by setting a smaller spacing, the amount of air in the space between the pads is relatively small, making it difficult to generate condensation or moisture, thereby avoiding the risk of short circuits between the pads due to solder dross or moisture.

[0042] In some embodiments, the width of the longitudinal spacing between the bottom pad 11 and the upper pad 21 is 1 mm to 1.2 mm.

[0043] To achieve rapid positioning and assembly of the upper FPC cable 200 and the lower FPC cable 100 onto the assembly fixture, refer to Figures 1 to 6 In some embodiments, at least two positioning holes 300 are provided on the periphery of both the connecting part 101 and the welding part 201.

[0044] Understandably, this setup, through the positioning hole 300, enables the upper FPC cable 200 and the lower FPC cable 100 to be quickly assembled onto the corresponding assembly fixture, while also enabling the positioning and docking of the upper solder pad 21 and the lower solder pad 11, ensuring the reliability of the welding, improving processing efficiency and the quality of the processed products.

[0045] To protect the solder pads from oxidation and corrosion after soldering, in some embodiments, the solder portion 201 of the upper FPC cable 200 is coated with a UV protective adhesive layer.

[0046] In this embodiment, the UV protective adhesive layer is applied to the upper end face of the upper FPC cable 200, that is, the end face pressed by the solder head. At the same time, the UV protective adhesive layer is applied after the soldering is completed.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A soldered FPC flat cable comprising a bottom FPC flat cable (100) and an upper FPC flat cable (200), characterized in that, The connecting part (101) of the bottom FPC flat cable (100) is internally provided with a plurality of rows of bottom pads (11) which are transversely spaced and externally exposed on one side, no first printed trace (12) of the bottom FPC flat cable (100) is arranged in the longitudinal interval of all the bottom pads (11), and the longitudinal two ends of each row of the bottom pads (11) in the connecting part (101) are respectively provided with a fixed soldering leg (13); the welding part (201) of the upper FPC flat cable (200) is arranged opposite to the connecting part (101), and the welding part (201) is internally provided with a plurality of rows of upper pads (21) which are arranged opposite to the plurality of rows of bottom pads (11) and externally exposed on two sides, no second printed trace (22) of the upper FPC flat cable (200) is arranged in the longitudinal interval of all the upper pads (21), and the longitudinal two ends of each row of the upper pads (21) in the welding part (201) are respectively provided with a fixed soldering hole (23) which is adapted to the corresponding fixed soldering leg (13), and the width of the upper pads (21) in the transverse direction is shorter than the width of the bottom pads (11), wherein, After the bottom FPC flat cable (100) is stacked with the upper FPC flat cable and the fixed soldering leg (13) is connected with the corresponding fixed soldering hole (23), the fixed soldering leg (13) is welded in the corresponding fixed soldering hole (23), and the upper pad (21) is welded with the corresponding bottom pad (11) to form the welded FPC flat cable.

2. The soldered FPC cord according to claim 1, characterized by, The upper pad (21) is provided with a U-shaped groove (211) away from one end connected with the second printed trace (22), and the upper pad (21) is provided with a through-tin hole (212).

3. The soldered FPC cable of claim 2, wherein, The upper pad (21) is provided with a through hole (213) which communicates the upper and lower end faces of the upper pad (21) near one end connected with the second printed trace (22).

4. The soldered FPC cable of claim 1, wherein, The connecting part (101) and the welding part (201) are further bonded by adhesive tape, wherein the adhesive tape is arranged in the transverse interval of the adjacent two rows of bottom pads (11) and the adjacent two rows of upper pads (21).

5. The soldered FPC flat cable according to claim 4, characterized by, The width of the transverse interval is 12mm to 15mm.

6. The soldered FPC cable of claim 5, wherein, The width of the longitudinal interval of the bottom pad (11) and the upper pad (21) is 1mm to 1.2mm.

7. The soldered FPC cable of claim 1, wherein, The connecting part (101) and the welding part (201) are respectively provided with at least two positioning holes (300) on the circumferential side.

8. The soldered FPC cable of claim 1, wherein, The welding part (201) of the upper FPC flat cable (200) is coated with a UV protective adhesive protective layer.

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