Flexible circuit board assembly with good reliability

Abstract

A flexible circuit board assembly with good reliability comprises a board body and a plurality of electric connecting pieces arranged on the board body, each electric connecting piece comprises a nickel sheet and a reinforcing sheet, the reinforcing sheets and the nickel sheets are arranged on the upper side and the lower side of the board body respectively, the reinforcing sheets are connected to the nickel sheets, the upper surfaces and the lower surfaces of the reinforcing sheets are horizontally arranged, and the upper surfaces and the lower surfaces of the reinforcing sheets are horizontally arranged. The reinforcing sheet is made of a metal material; the reinforcing piece comprises a bottom plate and more than two protruding parts arranged on the bottom plate, through holes are formed in the positions, corresponding to the protruding parts, of the plate body, and the protruding parts are arranged in the through holes in a penetrating mode. A tin layer is also arranged on the top surface of the lug boss; and the bottom surface of the nickel sheet is connected to the tin layer on the top surface of the lug boss. The flexible circuit board assembly provided by the utility model is high in installation stability, good in flatness and strong in practicability, and has relatively strong popularization significance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circuit board, and specifically relates to a flexible circuit board assembly with good reliability. BACKGROUND

[0002] Flexible circuit board has the advantages of high wiring density, light weight, thin thickness, small wiring space limitation and high flexibility, and is widely used in PC and peripheral products, communication products, electric vehicle battery management systems and consumer electronic products and other fields in existing life. The existing part of flexible circuit board needs to be connected with nickel sheet during production. At present, the flexible circuit board and the nickel sheet are usually connected by bonding method, however, the bonding method is not tight enough, and there is a problem of easy falling off. In addition, some nickel sheets are provided with insertion ends, the insertion ends are inserted into the flexible circuit board and then pressed, and the irregular bottom end protrudes outside the flexible circuit board, which affects the pressing effect. SUMMARY

[0003] Therefore, the purpose of the utility model is to provide a flexible circuit board assembly with good reliability to solve the problems in the background art.

[0004] A flexible circuit board assembly with good reliability, characterized by comprising a board body and a plurality of electrical connecting pieces arranged on the board body, the electrical connecting pieces comprising a nickel sheet and a reinforcing sheet, the reinforcing sheet and the nickel sheet being arranged on the upper and lower sides of the board body respectively, the reinforcing sheet being connected to the nickel sheet, the upper and lower surfaces of the reinforcing sheet being arranged horizontally, and the reinforcing sheet being a metal material; the reinforcing sheet comprises a bottom plate and two or more than two protruding parts arranged on the bottom plate, the board body is provided with a through hole corresponding to the position of the protruding part, and the protruding part is arranged in the through hole; a tin layer is also arranged on the top surface of the protruding part, and the bottom surface of the nickel sheet is connected to the tin layer on the top surface of the protruding part.

[0005] Further, a metal layer is arranged on the hole wall of the through hole, a tin layer is arranged on the outer surface of the protruding part, and the tin layer is connected to the metal layer of the hole wall.

[0006] Further, a glue layer is arranged between the nickel sheet and the board body, and the glue layer is arranged on the outer side of the tin layer on the bottom surface of the nickel sheet.

[0007] Further, a groove is arranged on the top surface of the protruding part of the reinforcing sheet, a boss is arranged on the reinforcing sheet corresponding to the position of the groove, the boss is embedded in the groove, and a connecting tin layer is arranged between the boss and the groove.

[0008] Further, a limiting groove is arranged on the bottom surface of the boss of the nickel sheet, and a tin layer connected to the reinforcing sheet is arranged in the limiting groove.

[0009] Furthermore, the convex ring is composed of multiple extension pieces, the top end of which is integrally connected to the bottom surface of the nickel sheet, and the bottom end of which extends downward; a tin layer is provided between the convex ring and the groove of the reinforcing piece.

[0010] In summary, this invention improves the stability of the nickel sheet installation and reduces the risk of detachment by using a tin-thermal-press welding method to form a stable connection between the metal reinforcing sheet and the nickel sheet on both sides of the flexible circuit board. Furthermore, the flatness of both sides of the reinforcing sheet ensures overall flatness and improves pressing stability during the thermal-press welding process. This invention is highly practical and has significant potential for widespread application. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the flexible circuit board assembly with high reliability proposed in this utility model.

[0012] Figure 2 This is a partial cross-sectional structural diagram of the present invention;

[0013] Figure 3 This is a partial cross-sectional structural diagram of the second embodiment of the present invention;

[0014] Figure 4 for Figure 3 A partial three-dimensional structural diagram. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0016] like Figures 1 to 2 As shown, this is the first embodiment of the flexible circuit board assembly with high reliability provided by the present invention. The flexible circuit board assembly with high reliability includes a board body 10 and a plurality of electrical connectors 20 disposed on the board body 10. The electrical connectors 20 include nickel sheets 21 and reinforcing sheets 22. The reinforcing sheets 22 and nickel sheets 21 are respectively disposed on the upper and lower sides of the board body 10, and the reinforcing sheets 22 are connected to the nickel sheets 21.

[0017] The upper and lower surfaces of the reinforcing sheet 22 are horizontally arranged, so that the flatness can be ensured during pressing. In the embodiment, the reinforcing sheet 22 is made of metal material. The reinforcing sheet 22 comprises a bottom plate 221 and a plurality of protruding portions 222 arranged on the bottom plate 221. The plate body 10 is provided with a through hole 11 corresponding to the positions of the protruding portions 222, and the protruding portions 222 are arranged in the through hole 11. Further, a metal wall is arranged in the through hole 11, and a tin layer 223 is arranged on the outer surface of the protruding portion 222 and the top surface of the protruding portion 222. The tin layer 223 is connected to the hole wall of the through hole 11 of the plate body 10 and the bottom surface of the nickel sheet 21 by hot pressing. Further, the area of the nickel sheet 21 except the welding point is provided with a glue layer 211, which plays a role of bonding, filling and buffering.

[0018] In the embodiment, the top surface of the protruding portion 222 of the reinforcing sheet 22 is provided with a groove 224, and the nickel sheet 21 is provided with a boss 212 corresponding to the position of the groove 224. The boss 212 is embedded in the groove 224, and a tin layer is arranged between the boss 212 and the groove 224 to improve the stability of the connection by hot pressing.

[0019] As shown in Figure 3 With Figure 4 As shown in FIG. 6, which is a second embodiment of the utility model, the structure of the embodiment is basically the same as that of the first embodiment, and the difference lies in that the boss of the nickel sheet 21 is a convex ring 213, and the bottom surface of the convex ring 213 is provided with a limiting groove 214. The convex ring 213 is composed of a plurality of extension sheets 215, the top end of the extension sheet 215 is integrally connected to the bottom surface of the nickel sheet 21, and the bottom end of the extension sheet 215 extends downward. A filling layer is arranged between the convex ring 213 and the groove 224 of the reinforcing sheet 22, and the filling layer is a tin layer which is filled in the inner and outer sides of the convex ring 213. The contact area is increased, and the stability is improved.

[0020] In summary, the utility model discloses a metal reinforcing sheet and a nickel sheet, and the two are stably connected on both sides of a flexible circuit board by hot pressing welding of tin, so that the stability of the nickel sheet installation is improved, and the risk of falling off is reduced. The double-sided flatness of the reinforcing sheet can ensure the overall flatness during hot pressing welding, and improve the pressing stability. The utility model has strong practicability and strong popularization significance.

[0021] The above-described embodiments only express some implementation manners of the present application, which are described in more detail and in more specifically, but cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for the ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A flexible circuit board assembly with high reliability, characterized in that: The application relates to a plate body and a plurality of electric connecting pieces arranged on the plate body, wherein the electric connecting pieces comprise nickel sheets and reinforcing sheets, the reinforcing sheets and the nickel sheets are arranged on the upper and lower sides of the plate body respectively, the reinforcing sheets are connected to the nickel sheets, the upper and lower surfaces of the reinforcing sheets are horizontally arranged, the reinforcing sheets are metallic materials, the reinforcing sheets comprise bottom plates and two or more than two protruding parts arranged on the bottom plates, the plate body is provided with through holes corresponding to the positions of the protruding parts, and the protruding parts are arranged in the through holes; the top surfaces of the protruding parts are also provided with tin layers, and the bottom surfaces of the nickel sheets are connected to the tin layers on the top surfaces of the protruding parts.

2. The flexible circuit board assembly of claim 1, wherein: the first and second flexible circuit boards are formed of a polyimide material. The hole walls of the through holes are provided with metal layers, the outer surfaces of the protruding parts are provided with tin layers, and the tin layers are connected to the metal layers of the hole walls.

3. The flexible circuit board assembly of claim 1, wherein: the first and second flexible circuit boards are formed of a polyimide material. The nickel sheets and the plate body are further provided with a glue layer, and the glue layer is arranged outside the tin layer on the bottom surface of the nickel sheet.

4. The flexible circuit board assembly of claim 1, wherein: the first and second flexible circuit boards are formed of a polyimide material. The top surfaces of the protruding parts of the reinforcing sheets are provided with grooves, the nickel sheets are provided with protrusions corresponding to the positions of the grooves, the protrusions are embedded in the grooves, and a connecting tin layer is arranged between the protrusions and the grooves.

5. The flexible circuit board assembly of claim 4, wherein: the first and second flexible circuit boards are formed of a polyimide material. The bottom surfaces of the protrusions of the nickel sheets are provided with limiting grooves, and the limiting grooves are provided with tin layers connected to the reinforcing sheets.

6. The flexible circuit board assembly of claim 5, wherein: the first and second flexible circuit boards are formed of a polyimide material. The protrusions of the nickel sheets are convex rings, the convex rings are combined by a plurality of extending sheets, the top ends of the extending sheets are integrally connected to the bottom surfaces of the nickel sheets, and the bottom ends of the extending sheets extend downward; and a tin layer is arranged between the convex rings and the grooves of the reinforcing sheets.

Images