阅读说明：本技术 导电端子与电连接结构 (Conductive terminal and electric connection structure ) 是由 范宝秀 于 2019-04-29 设计创作，主要内容包括：一种导电端子,其包括固持部、定位部以及焊接部。定位部连接固持部。定位部包括由第一沟槽分隔开来的二个定位分支。焊接部连接定位部,且定位部位于固持部与焊接部之间。焊接部包括由第二沟槽分隔开来的二个焊接分支,其中第一沟槽与第二沟槽相连通,且每一个焊接分支连接一个定位分支。定位部具有第一外径,且焊接部的至少局部的第二外径大于第一外径。另提出一种电连接结构。(A conductive terminal includes a holding portion, a positioning portion and a soldering portion. The positioning part is connected with the fixing part. The positioning part comprises two positioning branches separated by a first groove. The welding part is connected with the positioning part, and the positioning part is positioned between the fixing part and the welding part. The welding part comprises two welding branches separated by a second groove, wherein the first groove is communicated with the second groove, and each welding branch is connected with one positioning branch. The positioning part is provided with a first outer diameter, and at least a partial second outer diameter of the welding part is larger than the first outer diameter. An electrical connection structure is also provided.)

1. An electrically conductive terminal, comprising:

a holding part;

the positioning part is connected with the holding part and comprises two positioning branches separated by a first groove; and

the welding part is connected with the positioning part and is positioned between the fixing part and the welding part, the welding part comprises two welding branches separated by a second groove, the first groove is communicated with the second groove, and each welding branch is connected with one positioning branch,

wherein the positioning portion has a first outer diameter, and at least a partial second outer diameter of the welding portion is larger than the first outer diameter.

2. The conductive terminal of claim 1, wherein the soldering portion comprises a first extension segment connected to the positioning portion and a second extension segment connected to the first extension segment, and a turn exists between the first extension segment and the second extension segment.

3. The conductive terminal as claimed in claim 2, wherein the second outer diameter of the soldering portion at the first extension section increases from the positioning portion to the turn, and the second outer diameter of the soldering portion at the second extension section decreases from the turn to a direction away from the first extension section.

4. The conductive terminal as claimed in claim 2, wherein the second outer diameter of the soldering portion at the first extension section increases from the positioning portion to the turn, and the second outer diameter of the soldering portion at the second extension section decreases from the turn to a direction away from the first extension section.

5. The conductive terminal as claimed in claim 2, wherein the second outer diameter of the soldering portion at the first extension section increases from the positioning portion to the turn, and the second outer diameter of the soldering portion at the second extension section decreases from the turn to a direction away from the first extension section.

6. The conductive terminal of claim 1, further comprising:

and the limiting convex part is positioned between the positioning part and the fixing part.

7. An electrical connection structure, comprising:

a circuit board having a through hole; and

an electrically conductive terminal, comprising:

a holding section for holding the core wire;

the positioning part is connected with the fixing part and penetrates through the through hole, and the positioning part comprises two positioning branches separated by a first groove; and

the welding part is connected with the positioning part, the positioning part is positioned between the fixing part and the welding part, the welding part and the fixing part are positioned outside the through hole and are respectively positioned at two opposite sides of the circuit board, the welding part comprises two welding branches separated by a second groove, wherein the first groove is communicated with the second groove, and each welding branch is connected with one positioning branch,

wherein the positioning portion has a first outer diameter, and at least a partial second outer diameter of the welding portion is larger than the first outer diameter.

8. The electrical connection structure according to claim 7, wherein the soldering portion includes a first extension section connecting the positioning portion and a second extension section connecting the first extension section, and a turn exists between the first extension section and the second extension section.

9. The electrical connection structure as claimed in claim 8, wherein the second outer diameter of the soldering portion at the first extension section increases from the positioning portion to the bend, and the second outer diameter of the soldering portion at the second extension section decreases from the bend to a direction away from the first extension section.

10. The electrical connection structure as claimed in claim 8, wherein the second extension of the soldering portion has a distal end away from the turn, and the second outer diameter of the soldering portion at the distal end is smaller than or equal to the first outer diameter of the positioning portion.

11. The electrical connection structure according to claim 8, wherein the second outer diameter of the soldering portion at the first extension and the turn is larger than the first outer diameter of the positioning portion.

12. The electrical connection structure as claimed in claim 8, wherein the second extension of the soldering portion has a distal end away from the turn, and the second outer diameter of the soldering portion at the distal end is smaller than the inner diameter of the through hole.

13. The electrical connection structure of claim 7, wherein the conductive terminal further comprises a limiting protrusion located between the positioning portion and the holding portion, the limiting protrusion is located outside the through hole, and the soldering portion and the limiting protrusion are located on two opposite sides of the circuit board, respectively.

14. The electrical connection structure as claimed in claim 7, wherein each of the positioning branches has an outer wall surface facing an inner wall surface of the through hole, and a ratio of an arc length of the outer wall surface of each of the positioning branches to a circumference of the inner wall surface of the through hole is greater than or equal to 40%.

15. The electrical connection structure as claimed in claim 7, wherein the second outer diameter of at least a part of the soldering portion is larger than the inner diameter of the through hole.

Technical Field

The present invention relates to a terminal and a connecting structure, and more particularly, to a conductive terminal and an electrical connecting structure.

Background

A conventional electrical connection structure includes a circuit board and a conductive terminal soldered to the circuit board, wherein the circuit board has a through hole, and the conductive terminal is disposed through the through hole. Further, the conductive terminal includes a heart-shaped (heart) holding portion for holding the core wire, and the heart-shaped (heart) holding portion is disposed through the through hole. In the process of soldering the conductive terminals to the circuit board, the conductive terminals must first pass through the through holes of the circuit board, the heart-shaped (heart) holding portion is approximately positioned in the through holes, then the solder is distributed corresponding to the through holes, and then the solder is heated to make the conductive terminals to be connected to the circuit board through the solder.

However, since an excessive gap exists between the heart-shaped (heart) holding portion and the inner wall surface of the through hole, a hole such as a tin hole (pin hole) is easily generated in the solder after the curing molding, and thus the reliability of the electrical connection structure is seriously affected. For example, the generation of the tin hole (pin hole) may cause insufficient bonding strength between the conductive terminal and the circuit board, so that the conductive terminal is easily separated from the through hole, or the generation of the tin hole (pin hole) may cause a great reduction in the stability of current or signal transmission between the conductive terminal and the circuit board. At present, most of the disposal methods for the tin hole (pin) are to fill the solder in the tin hole (pin), but such disposal methods will cause the working hours to be lengthened, resulting in low process efficiency.

Disclosure of Invention

The invention is directed to a conductive terminal, which is helpful for improving the yield and efficiency of the manufacturing process.

The present invention is directed to an electrical connection structure having good reliability.

According to an embodiment of the invention, the conductive terminal includes a holding portion, a positioning portion and a soldering portion. The positioning part is connected with the fixing part. The positioning part comprises two positioning branches separated by a first groove. The welding part is connected with the positioning part, and the positioning part is positioned between the fixing part and the welding part. The welding part comprises two welding branches separated by a second groove, wherein the first groove is communicated with the second groove, and each welding branch is connected with one positioning branch. The positioning part is provided with a first outer diameter, and at least a partial second outer diameter of the welding part is larger than the first outer diameter.

In an embodiment of the invention, the welding portion includes a first extending section connected to the positioning portion and a second extending section connected to the first extending section, and a turn exists between the first extending section and the second extending section.

In an embodiment of the invention, the welding portion is gradually increased from the positioning portion to the bend in the second outer diameter of the first extending section, and the welding portion is gradually decreased from the bend in the second outer diameter of the second extending section to a direction away from the first extending section.

In an embodiment of the invention, the second extending section of the welding portion has a distal end away from the bend, and a second outer diameter of the welding portion at the distal end is smaller than or equal to the first outer diameter of the positioning portion.

In an embodiment of the invention, the second outer diameter of the welding portion at the first extending section and the turn is larger than the first outer diameter of the positioning portion.

In an embodiment of the invention, the conductive terminal further includes a limit protrusion located between the positioning portion and the holding portion.

According to an embodiment of the present invention, the electrical connection structure includes a circuit board and a conductive terminal. The circuit board is provided with a through hole. The conductive terminal comprises a fixing part, a positioning part and a welding part. The holding portion holds the core wire. The positioning part is connected with the fixing part and penetrates through the through hole. The positioning part comprises two positioning branches separated by a first groove. The welding part is connected with the positioning part, and the positioning part is positioned between the fixing part and the welding part. The welding part and the fixing part are positioned outside the through hole and are respectively positioned at two opposite sides of the circuit board. The welding part comprises two welding branches separated by a second groove, wherein the first groove is communicated with the second groove, and each welding branch is connected with one positioning branch. The positioning part is provided with a first outer diameter, and at least a partial second outer diameter of the welding part is larger than the first outer diameter.

In an embodiment of the invention, the position-limiting protrusion is located outside the through hole, and the soldering portion and the position-limiting protrusion are located on two opposite sides of the circuit board respectively.

In an embodiment of the invention, each of the positioning branches has an outer wall surface facing an inner wall surface of the through hole, and a ratio of an arc length of the outer wall surface of each of the positioning branches to a circumference of the inner wall surface of the through hole is greater than or equal to 40%.

In an embodiment of the invention, the second outer diameter of at least a part of the welding portion is larger than the inner diameter of the through hole.

In an embodiment of the invention, the second extending section of the welding portion has a distal end away from the bend, and a second outer diameter of the welding portion at the distal end is smaller than an inner diameter of the through hole.

Based on the above, the conductive terminal of the present invention is provided with the groove, and the groove can be used as a flow path of the solder in the process of mounting and soldering the conductive terminal on the circuit board, so as to make the filling of the solder more complete, and prevent the cured and formed solder from generating holes, such as tin holes (pin holes), thereby being beneficial to improving the yield and efficiency of the manufacturing process. Therefore, the bonding strength between the conductive terminals and the circuit board can be improved, and the stability of current or signal transmission between the conductive terminals and the circuit board can also be improved, so that the electric connection structure has good reliability.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1A is a schematic view of an electrical connection structure according to an embodiment of the present invention.

FIG. 1B is a schematic view of the electrical connection structure of FIG. 1A from another perspective.

Fig. 2 is a disassembled schematic view of the electrical connection structure of fig. 1A.

Fig. 3A and 3B are schematic views of the electrical connection structure of fig. 1A on two different cross-sections.

Fig. 4 is a schematic view of the electrical connection structure of fig. 3A after soldering.

Reference numerals:

10: a core wire;

20: welding flux;

100: an electrical connection structure;

110: a circuit board;

111: through holes are formed;

111 a: an inner wall surface;

120: a conductive terminal;

121: a holding part;

122: a positioning part;

122 a: positioning the branch;

122 b: an outer wall surface;

123: welding the part;

123 a: welding branches;

1231: a first extension section;

1232: a second extension section;

1232 a: a terminal end;

1233: turning;

124: a trench;

124 a: a first trench;

124 b: a second trench;

125: a limiting convex part;

AX: a central axis;

d1: a first outer diameter;

d2, D21, D22, D23: a second outer diameter;

i1: an inner diameter.

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts

Fig. 1A is a schematic view of an electrical connection structure according to an embodiment of the present invention. FIG. 1B is a schematic view of the electrical connection structure of FIG. 1A from another perspective. Fig. 2 is a disassembled schematic view of the electrical connection structure of fig. 1A. Referring to fig. 1A, fig. 1B and fig. 2, in the present embodiment, the electrical connection structure 100 can be applied to various electronic devices, such as a notebook computer, a personal computer, a server or a power supply, for transmitting current or signals. The electrical connection structure 100 may include a circuit board 110 and a conductive terminal 120, wherein the circuit board 110 may be a hard circuit board, a soft circuit board or a composite circuit board, and has a through hole 111 for mounting the conductive terminal 120.

The conductive terminals 120 may be a one-piece structure and may be made of metal or alloy with good conductivity. Specifically, the conductive terminal 120 includes a holding portion 121, a positioning portion 122 and a soldering portion 123, wherein the holding portion 121 is used for clamping the core wire 10, and the holding portion 121 may be a heart-shaped (heart-shaped) holding portion. On the other hand, the positioning portion 122 is connected to the holding portion 121 and extends from one side of the holding portion 121. The soldering portion 123 is connected to the positioning portion 122, wherein the soldering portion 123 extends from one side of the positioning portion 122, and the positioning portion 122 is located between the holding portion 121 and the soldering portion 123.

Fig. 3A and 3B are schematic views of the electrical connection structure of fig. 1A on two different cross-sections. Fig. 4 is a schematic view of the electrical connection structure of fig. 3A after soldering. Referring to fig. 1A, fig. 1B and fig. 3A, after the conductive terminal 120 is mounted in the through hole 111, the positioning portion 122 passes through the through hole 111, wherein the soldering portion 123 and the holding portion 121 are located outside the through hole 111, and the soldering portion 123 and the holding portion 121 are located on two opposite sides of the circuit board 110, respectively. On the other hand, the core wire 10 is clamped by the holding portion 121, so the core wire 10 is also located outside the through hole 111. Further, the positioning portion 122 has a first outer diameter D1, wherein the first outer diameter D1 is slightly smaller than the inner diameter I1 of the through hole 111, and the second outer diameter D2 of at least a part of the welding portion 123 is larger than the first outer diameter D1 and the inner diameter I1. Therefore, when the soldering portion 123 penetrates through the circuit board 110 and the positioning portion 122 penetrates through the through hole 111, if the soldering portion 123 moves toward the circuit board 110, the soldering portion 123 may interfere with the circuit board 110, so that the conductive terminal 120 may not easily separate from the through hole 111.

In the present embodiment, the conductive terminal 120 is provided with a groove 124, wherein the groove 124 penetrates from the end of the soldering portion 123 to the positioning portion 122 and ends in front of the holding portion 121. Specifically, the groove 124 can be roughly divided into a first groove 124a and a second groove 124b which are communicated with each other, wherein the first groove 124a divides the positioning portion 122 into two separated positioning branches 122a, and the second groove 124b divides the welding portion 123 into two separated welding branches 123 a. The two positioning branches 122a and the two welding branches 123a are arranged in a one-to-one manner, that is, each welding branch 123a connects to one positioning branch 122 a.

In the process of mounting and soldering the conductive terminals 120 on the circuit board 110, the grooves 124 can serve as a flow path for the solder 20, so as to complete the filling of the solder 20 and prevent the cured solder 20 from generating voids, such as tin holes (pinholes), thereby improving the yield and efficiency of the manufacturing process, as shown in fig. 3A and 4. Therefore, not only the bonding strength between the conductive terminals 120 and the circuit board 110 can be enhanced, but also the stability of the current or signal transmission between the conductive terminals 120 and the circuit board 110 can be enhanced, so that the electrical connection structure 100 of the present invention has good reliability.

As shown in fig. 3A and fig. 4, the solder 20 completely covers the soldering portion 123 and the positioning portion 122, wherein the solder 20 not only fills the through hole 111 and the trench 124, but also fills the holding portion 121 to cover the core wire 10. Therefore, the bonding area and bonding strength between the conductive terminals 120 and the solder 20 can be greatly improved.

Referring to fig. 3A, the welding portion 123 includes a first extending portion 1231 connected to the positioning portion 122 and a second extending portion 1232 connected to the first extending portion 1231, and a turn 1233 exists between the first extending portion 1231 and the second extending portion 1232. Specifically, the conductive terminal 120 is a hollow structure, wherein the conductive terminal 120 has a central axis AX, and the first extension 1231 and the second extension 1232 are both inclined to the central axis AX. In the present embodiment, the welding portion 123 increases from the positioning portion 122 toward the turn 1233 at the second outer diameter D21 of the first extension 1231, wherein the second outer diameter D22 of the welding portion 123 at the turn 1233 is greater than the second outer diameter D21. On the other hand, the second outer diameter D22 and the second outer diameter D21 can be regarded as a portion of the second outer diameter D2, and are larger than the inner diameter I1 of the through hole 111 and the first outer diameter D1 of the positioning portion 122.

In succession to the above, the maximum outer diameter of the welding portion 123 substantially falls at the turn 1233, and the welding portion 123 gradually decreases from the turn 1233 toward the direction away from the first extension 1231 at the second outer diameter D23 of the second extension 1232. In other words, the outer diameter of the soldering portion 123 of the conductive terminal 120 gradually increases from the end 1232a of the second extension 1232 to the turn 1233, and gradually decreases from the turn 1233 to the positioning portion 122, and the outer diameter design is favorable for the process of inserting the conductive terminal 120 to the circuit board 110.

Further, the second extension 1232 of the welding part 123 is a forward guiding structure, wherein the second outer diameter D23 of the second extension 1232 at the end 1232a is smaller than or equal to the first outer diameter D1 of the positioning part 122, and the second outer diameter D23 of the second extension 1232 at the end 1232a is smaller than the inner diameter I1 of the through hole 111. Therefore, in the process of passing the soldering portion 123 through the through hole 111, the end 1232a of the soldering portion 123 does not interfere with the circuit board 110 or the through hole 111, the outer diameter of the soldering portion 123 gradually increases from the end 1232a of the second extension 1232 to the turn 1233, and the soldering portion 123 can elastically deform due to the groove 124 as the depth of the soldering portion 123 passing through the through hole 111 increases, so that the soldering portion 123 smoothly passes through the through hole 111. After the welding portion 123 passes through the through hole 111, the welding portion 123 elastically returns to the state before the deformation due to the force, and the positioning portion 122 passes through the through hole 111.

Referring to fig. 1A, fig. 1B and fig. 3B, in the present embodiment, each positioning branch 122a of the positioning portion 122 has an outer wall surface 122B facing the inner wall surface 111A of the through hole 111, and a ratio of an arc length of the outer wall surface 122B of each positioning branch 122a to a circumference of the inner wall surface 111A of the through hole 111 is greater than or equal to 40%. Accordingly, if the positioning portion 122 deviates within the through hole 111, the positioning portion 122 can be driven to reset by the pushing action of the two positioning branches 122a and the inner wall surface 111a of the through hole 111, so that the positioning portion 122 is substantially maintained at the center of the through hole 111.

Referring to fig. 1A, fig. 1B and fig. 2, the conductive terminal 120 further includes a limiting protrusion 125, wherein the limiting protrusion 125 is located between the positioning portion 122 and the holding portion 121, and the number of the limiting protrusions 125 can be two or can be increased or decreased according to design requirements. After the positioning portion 122 penetrates the through hole 111, the limiting protrusion 125 can function as a stopper to prevent the holding portion 121 from penetrating the through hole 111. At this time, the position-limiting protrusion 125 is located outside the through hole 111, and the soldering portion 123 and the position-limiting protrusion 125 are located on two opposite sides of the circuit board 110, respectively.

Specifically, the number of the positioning branches 122a of the positioning portion 122 is the same as the number of the welding branches 123a of the welding portion 123, wherein the number of the positioning branches 122a and the number of the welding branches 123a of the welding portion 123 are at least two, and the positioning branches 122a and the welding portion 123 are symmetrically arranged, equidistantly arranged, or annularly arranged based on the central axis AX of the conductive terminal 120.

In summary, the conductive terminal of the present invention has the groove, and the groove can be used as a flow path of the solder in the process of mounting and soldering the conductive terminal on the circuit board, so as to make the filling of the solder more complete, and prevent the cured and formed solder from generating holes, such as tin holes (pin holes), thereby contributing to the improvement of the yield and efficiency of the manufacturing process. Therefore, the bonding strength between the conductive terminals and the circuit board can be improved, and the stability of current or signal transmission between the conductive terminals and the circuit board can also be improved, so that the electric connection structure has good reliability.

On the other hand, the outer diameter of the welding part of the conductive terminal is gradually increased from the tail end to the turning part and is gradually reduced from the turning part to the positioning part, and the outer diameter design is favorable for the process of inserting the conductive terminal to the circuit board. Furthermore, because the second outer diameter of at least part of the welding part is larger than the inner diameter of the through hole, when the welding part penetrates through the circuit board and the positioning part penetrates through the through hole, if the welding part moves towards the circuit board, the welding part 1 can generate structural interference with the circuit board, so that the conductive terminal cannot be easily separated from the through hole. In addition, because the ratio of the arc length of the outer wall surface of each positioning branch of the positioning part to the perimeter of the inner wall surface of the through hole is more than or equal to 40%, if the positioning part deviates in the through hole, the pushing action of the two positioning branches and the inner wall surface of the through hole can drive the positioning part to reset, so that the positioning part is substantially kept at the center of the through hole.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.