Soldering structure and coil component

Abstract

A welding structure includes a conductive base, a wire, and a welding portion. The conductive base includes a first limiting member and a second limiting member, the second limiting member being spaced apart from the first limiting member. The wire includes a conductive portion and an insulating layer covering the conductive portion. The conductive portion includes an exposed portion exposed by the insulating layer. The wire passes through the first limiting member, the exposed portion is located between the first limiting member and the second limiting member, and the second limiting member clamps one end of the wire. The welding portion at least partially covers the exposed portion, the first limiting member, and the second limiting member, thereby electrically connecting the wire to the conductive base.

Description

Welding structure and coil components The present disclosure relates to a welding structure and a coil component, and more particularly to a welding structure with improved reliability and a coil component including the welding structure. Soldering is the process of joining two metal surfaces using solder. During the soldering process, solder is placed on the two metal surfaces to be joined and heated to melt the solder. The melted solder cools and solidifies, forming a solder joint that connects the two metal surfaces. Soldering is widely used in the electronics industry. For example, soldering can be used to connect wires in circuits and to connect electronic components to printed circuit boards (PCBs). However, conventional solder joints have relatively weak structural strength. For example, when soldering a wire to a metal surface, the wire can be damaged during the insulation removal process or subjected to the reciprocating pull of the connected component due to thermal expansion and contraction, easily causing breakage at or near the solder joint. Therefore, improving solder joints to enhance their reliability has become a major goal for relevant industry players. According to one embodiment of the present disclosure, a welding structure is provided, comprising a conductive base, a conductive wire, and a welding portion. The conductive base comprises a first retaining member and a second retaining member, the second retaining member being spaced apart from the first retaining member. The conductive wire comprises a conductive portion and an insulating layer covering the conductive portion, the conductive portion comprising an exposed portion exposed from the insulating layer. The conductive wire passes through the first retaining member, the exposed portion being located between the first and second retaining members, and the second retaining member clamping one end of the conductive wire. The welding portion at least partially covers the exposed portion, the first retaining member, and the second retaining member, thereby electrically connecting the conductive wire to the conductive base. According to another embodiment of the present disclosure, a coil element is provided, comprising a core member, a conductive base, a wire, and a welding portion. The conductive base is disposed on the core member, wherein the conductive base comprises a first stopper and a second stopper spaced apart from the first stopper. The wire is wound around the core member, wherein the wire comprises a conductive portion and an insulating layer covering the conductive portion, the conductive portion comprising an exposed portion exposed from the insulating layer, the wire passing through the first stopper, the exposed portion being located between the first stopper and the second stopper, and the second stopper clamping one end of the wire. The welding portion at least partially covers the exposed portion, the first stopper, and the second stopper, thereby electrically connecting the wire to the conductive base. Compared to prior art, the present disclosure utilizes both a first and a second stopper in the conductive base, effectively confining the exposed portion of the wire between the first and second stoppers. This helps maintain the structural strength of the wire's connection adjacent to the first stopper and reduces the effects of external forces on the electrical connection between the soldering portion and the exposed portion. By at least partially covering the exposed portion, the first and second stoppers with the soldering portion, the present disclosure prevents the soldering portion from shrinking toward a single stopper, thereby improving coverage of the exposed portion. Consequently, the disclosed soldering structure exhibits enhanced reliability. The aforementioned and other technical contents, features and effects of the present disclosure will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. In order to make the contents of the present disclosure clearer and easier to understand, the following figures may be simplified schematic diagrams, and the elements therein may not be drawn to scale. In addition, the number and size of each element in the drawings are for illustration only and do not limit the present disclosure. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, bottom, top, etc., are only reference to the directions of the drawings. Therefore, the directional terms used are for illustration, not for limitation of the present disclosure. In addition, in the following embodiments, the same or similar elements will use the same or similar reference numerals. The description below of "a first feature is formed on or above a second feature" may mean "the first feature is in direct contact with the second feature" or "there are other features between the first feature and the second feature", so that the first feature and the second feature are not in direct contact. This disclosure uses terms such as "first," "second," and so on to describe elements, regions, layers, and / or sections, but it should be understood that these terms are merely used to distinguish one element, region, layer, and / or section from another element, region, layer, and / or section, and do not imply or represent any prior ordinal number of the elements, nor do they represent the order in which one element is arranged relative to another element, or the order in which they are manufactured. Therefore, without departing from the scope of the specific embodiments of this disclosure, the first element, region, layer, and / or section discussed below may also be referred to as the second element, region, layer, and / or section. These terms in the claims may differ from those in the specification and may be replaced with "first," "second," "third," and so on, according to the order in which the elements are declared in the claims. In this disclosure, for ease of explanation, the following figures are described with reference to an XYZ rectangular coordinate system. In the present disclosure, terms such as “electrical connection”, “electrical contact” or “coupling” include any direct or indirect electrical connection means. It should be understood that the following embodiments may be implemented by replacing, recombining, or combining features from various different embodiments to create other embodiments without departing from the spirit of the present disclosure. Features from various embodiments may be mixed and matched as needed, as long as they do not violate the spirit of the disclosure or conflict with each other. Please refer to Figures 1 to 6. Figure 1 is a schematic perspective view of a coil component 10 according to one embodiment of the present disclosure. Figure 2 is another schematic perspective view of the coil component 10 in Figure 1. Figure 3 is a schematic perspective view of the coil component 10 in Figure 1 omitting the plate 130. Figure 4 is a partially enlarged view of the coil component 10 in Figure 3 , omitting the soldering portion 400 in Figure 1 to clearly illustrate the connection between the conductive base 200 and the conductive wire 300. Figure 5 is a schematic plan view of a portion of the coil component 10 in Figure 1 , primarily illustrating the connection between the conductive base 200, the conductive wire 300, and the soldering portion 400. Figure 6 is a schematic cross-sectional view taken along line AA' in Figure 5 , primarily illustrating the connection between the conductive base 200, the conductive wire 300, and the soldering portion 400. The coil component 10 includes a core member 100, a conductive base 200, a conductive wire 300, and a soldering portion 400. The coil element 10 may be applied as an inductor element, such as a common mode choke (CMC), but is not limited thereto. The core member 100 may include a winding portion 110 and two flange portions 120. The winding portion 110 may define an axial direction (herein, direction X). The two flange portions 120 are disposed at opposite ends of the winding portion 110 in the axial direction. The two flange portions 120 protrude outward relative to the winding portion 110 in a direction perpendicular to the axial direction (e.g., a direction located on the XY plane). Therefore, the projection of the winding portion 110 on a plane perpendicular to the axial direction (herein, the XY plane) lies within the projection of each flange portion 120 on a plane perpendicular to the axial direction. Each flange portion 120 includes an inner surface 121A, an outer surface 121B, and side surfaces 122A, 122B, 123A, and 123B connected between the inner surface 121A and the outer surface 121B. The inner surface 121A and the outer surface 121B are axially opposed to each other, with the inner surface 121A facing the winding portion 110 and the outer surface 121B facing away from the winding portion 110. The side surfaces 122A and 122B are opposed to each other in a first direction (herein, direction Y) perpendicular to the axial direction, and the side surfaces 123A and 123B are opposed to each other in a second direction (herein, direction Z) perpendicular to the axial direction. The first and second directions may be perpendicular to each other. The two flange portions 120 may be integrally formed with the winding portion 110. The core member 100 may be made of a magnetically permeable material, such as ferrite. The coil element 10 may optionally further include a plate 130 disposed axially on the side surfaces 123A of the two flange portions 120. Thus, the core member 100 and the plate 130 may together form a closed magnetic circuit. The wire 300 is wrapped around the core member 100. The wire 300 includes a conductive portion 310 and an insulating layer 320 covering the conductive portion 310. The conductive portion 310 may be made of a metal such as copper, silver, aluminum, or a combination thereof. The insulating layer 320 may be made of a resin such as polyurethane, polyester, polyamide-imide (PAI), or a combination thereof. In some embodiments, the wire 300 may be an enameled wire. The number of wires 300 is illustrated as two here, and the two wires 300 are magnetically coupled to each other but electrically insulated from each other. The middle portion P1 of each wire 300 is wound around the winding portion 110 of the core member 100, and the two end portions P2 of each wire 300 are respectively arranged on the outer surface 121B of the two flange portions 120, so that the coil element 10 is a four-terminal element. In some embodiments, the two wires 300 can be symmetrically wound around the winding portion 110, and the number of turns of the two wires 300 on the winding portion 110 can be the same. The flange portion 120 can form grooves 124 on the side surfaces 122A and 122B for the wires 300 to be arranged. In this way, the wires 300 do not protrude from the side surfaces 122A and 122B of the flange portion 120, which is beneficial to reducing the overall volume of the coil element 10 and reducing the probability of interference between the coil element 10 and other elements when the coil element 10 is assembled. The conductive base 200 is disposed on the core member 100. The conductive base 200 can serve as an end electrode of the coil element 10. The conductive base 200 can be, for example, a wire rack. The number of conductive bases 200 can be flexibly adjusted to match the number of wires 300. Here, the number of conductive bases 200 is four, and each is used to electrically connect to the four end portions P2 of the two wires 300. Two of the four conductive bases 200 can be spaced apart and symmetrically disposed on one of the flange portions 120, and the other two of the four conductive bases 200 can be spaced apart and symmetrically disposed on the other flange portion 120. The conductive seat 200 may include a main body 230, a first limiter 210 and a second limiter 220, and the main body 230 is connected to the first limiter 210 and the second limiter 220. The first limiter 210 and the second limiter 220 may be integrally formed on the main body 230. The main body 230 may include a first sheet 231 and a second sheet 232, the first sheet 231 is arranged on the outer surface 121B, the second sheet 232 is arranged on the side surface 123B, and the second sheet 232 is bent relative to the first sheet 231. Here, the second sheet 232 is bent vertically relative to the first sheet 231, but is not limited to this. The shape of the main body 230 can be flexibly adjusted according to actual needs. The coil element 10 can be electrically connected to other components, such as a printed circuit board (PCB), through the second sheet 232. As shown in Figures 4 to 6, the second stopper 220 is spaced apart from the first stopper 210. The conductive portion 310 includes an exposed portion 312 located at the end P2 of the conductive wire 300. The exposed portion 312 is not covered by the insulating layer 320 but is exposed by the insulating layer 320. The conductive wire 300 passes through the first stopper 210, and the exposed portion 312 is located between the first stopper 210 and the second stopper 220, and the second stopper 220 clamps one end of the conductive wire 300. The welding portion 400 at least partially covers the exposed portion 312, the first stopper 210, and the second stopper 220, thereby electrically connecting the conductive wire 300 to the conductive base 200. In this way, the conductive wire 300 can be electrically connected to other components, such as a printed circuit board, through the conductive base 200. Specifically, the end portion P2 of the wire 300 may include a first sub-portion P21, a second sub-portion P22, and a third sub-portion P23 (see FIG6 ). The first sub-portion P21 passes through the first retaining member 210, the third sub-portion P23 is held by the second retaining member 220, the second sub-portion P22 is located between the first and third sub-portions P21, P23, and the exposed portion 312 is located in the second sub-portion P22. The third sub-portion P23 may include the end 301 of the end portion P2 of the wire 300, or, among the first, second, and third sub-portions P21, P22, P23, the third sub-portion P23 is closest to the end 301 of the end portion P2. The aforementioned "third sub-portion P23 may include the end 301 of the end portion P2 of the conductive wire 300" may refer to the end 301 of the conductive wire 300 being clamped by the second retaining member 220. The aforementioned "end 301 of the third sub-portion P23 closest to the end portion P2" may refer to the end 301 not being clamped by the second retaining member 220 and being located on the side of the second retaining member 220 away from the second sub-portion P22. In other words, the aforementioned "the second retaining member 220 clamping one end of the conductive wire 300" may refer to the second retaining member 220 clamping the end 301 of the conductive wire 300, or the second retaining member 220 clamping a portion of the conductive wire 300 adjacent to the end 301. The conductive wire 300 may further include a connecting portion P3 connected between the end portion P2 and the middle portion P1. The first retaining member 210 may include a first extension portion 212 and a first covering portion 214. The first extension portion 212 extends from the main body 230, and the first covering portion 214 extends from the first extension portion 212 toward the main body 230. A first space 216 is defined between the first extension portion 212 and the first covering portion 214 of the first retaining member 210 for accommodating the first sub-portion P21 of the conductive wire 300. In other words, the first sub-portion P21 can be covered by the first covering portion 214 and is not exposed. In this embodiment, the first extension portion 212 and the first covering portion 214 together form a clamping structure that can be used to clamp and secure the first sub-portion P21 of the conductive wire 300, thereby providing an auxiliary effect of the second retaining member 220 in clamping and securing the conductive wire 300, but the present invention is not limited thereto. In some embodiments, the first extension portion 212 and the first covering portion 214 may only provide the first space 216 to accommodate the first sub-portion P21 of the conductive wire 300 without clamping the first sub-portion P21 of the conductive wire 300. For details, please refer to the relevant descriptions of Figures 7 and 8. In other words, before forming the soldering portion 400, the second retaining member 220 is primarily used to clamp and secure the conductive wire 300. The second retaining member 220 may include a second extension portion 222 and a second covering portion 224. The second extension portion 222 extends from the main body 230, and the second covering portion 224 extends from the second extension portion 222 toward the main body 230. A second space 226 is defined between the second extension portion 222 and the second covering portion 224 of the second retaining member 220 to accommodate the third sub-portion P23 of the wire 300. In other words, the third sub-portion P23 is covered by the second covering portion 224 and is not exposed. The second extension portion 222 and the second covering portion 224 together form a clamping structure that can be used to clamp and secure the third sub-portion P23 of the wire 300. The second retaining member 220 is used to secure the wire 300 during the welding process. When manufacturing the coil component 10, the wire 300 is first wound around the winding portion 110. Then, one end P2 of the wire 300 is passed through the groove 124 formed in the flange portion 120. The first sub-portion P21 of the wire 300 is then passed through the first retaining member 210, and the third sub-portion P23 is clamped by the second retaining member 220. In this embodiment, the first sub-portion P21 is also clamped by the first retaining member 210. Afterwards, a laser stripping process can be performed to remove a portion of the insulating layer 320 located at the second sub-portion P22 of the conductive line 300, i.e., the portion irradiated by the laser (not shown), thereby forming an exposed portion 312. The exposed portion 312 is located between the first retaining member 210 and the second retaining member 220 and on the outward side of the conductive line 300 (i.e., away from the flange portion 120). A soldering process can then be performed to form the soldered portion 400. For example, the exposed portion 312 can be covered with solder (not shown). A laser soldering process or a reflow soldering process is then used to melt the solder. The melted solder at least partially covers the exposed portion 312, the first retaining member 210, and the second retaining member 220. The melted solder cools and solidifies, resulting in the soldered portion 400 that at least partially covers the exposed portion 312, the first retaining member 210, and the second retaining member 220. According to an embodiment of the present invention, the solder may include tin, that is, the material of the soldering portion 400 may include tin. As shown in Figures 5 and 6 , the welding portion 400 can completely cover the exposed portion 312. This improves the stability of the electrical connection between the welding portion 400 and the exposed portion 312. The welding portion 400 can also partially cover the body 230. This facilitates even placement of the welding portion 400 between the first retaining member 210, the second retaining member 220, and the body 230, further improving the stability of the electrical connection between the welding portion 400 and the exposed portion 312. As shown in FIG6 , the soldering portion 400 can be separated from the first extension portion 212 and the second extension portion 222. Specifically, a space 240 is defined between the first extension portion 212 and the second extension portion 222, and the soldering portion 400 is not disposed in the space 240. If solder is filled into the space 240, a cavity may be formed inside the solder after the reflow soldering process. When there is moisture in the cavity, during another reflow soldering process in which the coil element 10 is assembled to another element such as a printed circuit board, the cavity may explode and cause the solder to splash everywhere, thereby causing contamination and a short circuit. Therefore, by not disposing the soldering portion 400 in the space 240, the probability of contamination and a short circuit caused by solder splashing is reduced. In the present disclosure, the conductive base 200 includes both a first stopper 210 and a second stopper 220, thereby providing the following advantages. First, the exposed portion 312 can be confined between the first stopper 210 and the second stopper 220, thereby facilitating the maintenance of the structural strength of the connection portion P3. Specifically, the first covering portion 214 of the first stopper 210 and the second covering portion 224 of the second stopper 220 respectively cover the first sub-portion P21 and the third sub-portion P23 of the conductive line 300. When the insulating layer 320 of the second sub-portion P22 is removed by laser, the first covering portion 214 and the second covering portion 224 protect the first sub-portion P21 and the third sub-portion P23 from being irradiated by the laser. Thus, the exposed portion 312 can be confined between the first stopper 210 and the second stopper 220, thereby facilitating the maintenance of the structural strength of the portion outside the second sub-portion P22. For example, the structural strength of the connection portion P3 adjacent to the first sub-portion P21 can be maintained, thereby reducing the probability of the connection portion P3 breaking when the wire 300 is pulled by an external force F (see FIG. 6 ). For example, the core member 100 may pull on the connection portion P3 due to thermal expansion and contraction. Secondly, because the exposed portion 312 is located between the first and second stoppers 210, 220, the connection between the solder portion 400 and the exposed portion 312 is also located between the first and second stoppers 210, 220. As shown in FIG6 , when the wire 300 is pulled by an external force F (which may be caused by the thermal expansion and contraction of the core component 100), the external force F is transmitted to the first stopper 210. The first stopper 210 prevents the external force F from being transmitted to the area between the first and second stoppers 210, 220 (i.e., the second sub-portion P22). Therefore, the effect of the external force F on the electrical connection between the solder portion 400 and the exposed portion 312 is reduced. Furthermore, when forming the solder portion 400, the present disclosure simultaneously covers the first stopper 210 and the second stopper 220 with the molten solder. As the molten solder cools and solidifies, the solder portion 400 is less likely to shrink toward the stopper on one side, thereby facilitating the maintenance of the width of the solder portion 400 (here, the length of the solder portion 400 in direction Y). This improves the coverage of the exposed portion 312 by the solder portion 400. When there is a need to remelt the solder portion 400, the remelted solder portion 400 can maintain its width, as the solder portion 400 simultaneously covers the first stopper 210 and the second stopper 220, thereby maintaining the coverage of the exposed portion 312 by the remelted solder portion 400. Compared to a conductive base with only a single retaining member, that is, a conductive base with only the second retaining member 220 to secure the wire 300 during the welding process, the connection portion P3 of the wire 300 is adjacent to the exposed portion 312. When forming the exposed portion 312, due to the limitations of laser focusing accuracy, the connection portion P3 is also damaged by the laser, resulting in a weakened structural strength of the connection portion P3. When the wire 300 is pulled by external forces (which may be caused by the thermal expansion and contraction of the core member 100), it is easy to break at the connection portion P3. Furthermore, when the wire 300 is pulled by external forces, due to the lack of protection from the first retaining member 210, the external forces will directly act on the weld portion 400 and the exposed portion 312, which can easily cause the weld portion 400 and the exposed portion 312 to separate. Furthermore, for a conductive base provided with only the second stopper 220 and without the first stopper 210, when forming the solder portion 400, as the molten solder cools and solidifies, the molten solder is easily influenced by the second stopper 220 and shrinks toward the second stopper 220, causing the solder portion 400 to be concentrated on the second stopper 220, thereby reducing the area covered by the solder portion 400 on the exposed portion 312. In some instances, the solder portion 400 may not even cover the exposed portion 312, resulting in a failure to form an electrical connection between the solder portion 400 and the exposed portion 312. In other words, the present disclosure facilitates maintaining the structural strength of the connection portion P3 and improving the stability of the electrical connection between the soldering portion 400 and the exposed portion 312 by having the conductive base 200 include both the first limiting member 210 and the second limiting member 220 , thereby improving the reliability of the coil element 10 . 7 , which is a partial side view of a coil element 10a according to another embodiment of the present disclosure. The main difference between the coil element 10a and the coil element 10 is that the structure of the first stopper 210a is different from that of the first stopper 210 . In Figure 7 , the end T21 of the second covering portion 224 of the second retaining member 220 is positioned toward the main body 230 to provide a clamping and securing function for the wire 300 during the soldering process. The end T11 of the first covering portion 214a of the first retaining member 210a is positioned away from the main body 230. Specifically, the first covering portion 214a has an end T11 and a connection end T12 connected to the first extension portion 212a, with the end T11 being further away from the first extension portion 212a than the connection end T12. Thus, the first retaining member 210a only provides a first space 216a to accommodate the first sub-portion P21 of the wire 300 (see Figure 6 ) without clamping the first sub-portion P21 of the wire 300. This prevents the first sub-portion P21 from being clamped by the first retaining member 210a and reducing its tensile strength, further improving the reliability of the coil component 10a. A first distance SD1 is defined between the first extension portion 212a and the first covering portion 214a, and a second distance SD2 is defined between the second extension portion 222 (see FIG. 4 ) and the second covering portion 224. The first distance SD1 may be greater than the second distance SD2. The first distance SD1 may refer to the minimum distance between the end T11 of the first covering portion 214a and the first extension portion 212a in the direction X. The second distance SD2 may refer to the minimum distance between the end T21 of the second covering portion 224 and the second extension portion 222 in the direction X. The direction X may be, for example, parallel to the normal direction of the outer surface of the first sheet 231 (not shown). An angle A1 is defined between the first extension portion 212a and the first covering portion 214a. The angle A1 may be greater than or equal to 5 degrees and less than or equal to 60 degrees. Please refer to FIG8 , which is a partial side view of a coil element 10b according to another embodiment of the present disclosure. The main difference between the coil element 10b and the coil element 10 is that the structure of the first stopper 210b is different from that of the first stopper 210. In this embodiment, the first space 216b defined between the first extension portion 212b and the first covering portion 214b of the first stopper 210b is an arc-shaped space. The shape of the first space 216b can match the shape of the wire 300, so that the first stopper 210b only provides the first space 216b to accommodate the first sub-portion P21 of the wire 300 (see FIG6 ) without clamping the first sub-portion P21 of the wire 300. This can prevent the first sub-portion P21 from being clamped by the first stopper 210b and reducing its tensile strength, thereby further improving the reliability of the coil element 10b. As shown in FIG8 , the first covering portion 214b includes an arc segment 2142 corresponding to the arc space and an end segment 2144 connected to the arc segment 2142, and the end segment 2144 is parallel to the first extension portion 212b. The aforementioned "end segment 2144 is parallel to the first extension portion 212b" may include the end segment 2144 being parallel to the first extension portion 212b or substantially parallel. Specifically, the end segment 2144 defines a first extension direction (i.e., parallel to its length direction), the first extension portion 212b defines a second extension direction (i.e., parallel to its length direction), and there is an angle between the first extension direction of the end segment 2144 and the second extension direction of the first extension portion 212b, and the angle is between 0 degrees and negative 10 degrees ( degrees) or within the range of 180 degrees plus or minus 10 degrees ( degrees). Please refer to Figures 1 to 6. The present disclosure further provides a welding structure (not otherwise numbered). The welding structure includes a conductive base 200, a wire 300, and a welding portion 400. The conductive base 200 includes a first limiting member 210 and a second limiting member 220, and the second limiting member 220 is spaced apart from the first limiting member 210. The wire 300 includes a conductive portion 310 and an insulating layer 320 covering the conductive portion 310. The conductive portion 310 includes an exposed portion 312 exposed by the insulating layer 320. The wire 300 passes through the first limiting member 210, and the exposed portion 312 is located between the first limiting member 210 and the second limiting member 220. The second limiting member 220 clamps one end of the wire 300. The welding portion 400 at least partially covers the exposed portion 312, the first limiting member 210, and the second limiting member 220, so that the wire 300 is electrically connected to the conductive base 200. The conductive base 200 includes both the first stopper 210 and the second stopper 220, thereby improving the reliability of the soldering structure. For details about the soldering structure, please refer to the above description and will not be repeated here. In some embodiments, the first stopper 210 can be replaced with the first stopper 210a in FIG. 7. In other embodiments, the first stopper 210 can be replaced with the first stopper 210b in FIG. 8. The embodiments shown in Figures 1 through 8 illustrate the soldering structure applied to coil components 10, 10a, and 10b. However, these are merely examples, and the present disclosure is not limited thereto. The soldering structure disclosed herein can be applied to other types of electronic components. By providing improved reliability through the soldering structure, electronic components incorporating the disclosed soldering structure can also achieve improved reliability. Compared to the prior art, the present disclosure, by virtue of the conductive base including both the first and second limiters, is advantageous in limiting the exposed portion of the conductor between the first and second limiters, thereby facilitating the maintenance of the structural strength of the connection portion of the conductor adjacent to the first limiter, and reducing the influence of external forces on the electrical connection between the welding portion and the exposed portion. The present disclosure, by virtue of the welding portion at least partially covering the exposed portion, the first and second limiters, can prevent the welding portion from shrinking toward a single side limiter, thereby facilitating the improvement of the coverage of the exposed portion by the welding portion. Thus, the welding structure of the present disclosure has enhanced reliability. The above description is merely a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention. 10, 10a, 10b: Coil element 100: Core 110: Winding portion 120: Flange 121A: Inner surface 121B: Outer surface 122A, 122B, 123A, 123B: Side surface 124: Groove 130: Plate 200: Conductive seat 210, 210a, 210b: First stopper 212, 212a, 212b: First extension 214, 214a, 214b: First covering portion 2142: Arc segment 2144: End segment 216, 216a, 216b: First space 220: First Second limiting member 222: Second extension portion 224: Second covering portion 226: Second space 230: Main body 231: First sheet 232: Second sheet 240: Space 300: Wire 301: End 310: Conductive portion 312: Exposed portion 320: Insulating layer 400: Welding portion A1: Angle F: External force P1: Middle portion P2: End P21: First sub-portion P22: Second sub-portion P23: Third sub-portion P3: Connecting portion SD1: First distance SD2: Second distance T11, T21: End T12: Connecting end X, Y, Z: Direction FIG1 is a schematic perspective view of a coil element according to an embodiment of the present disclosure. FIG2 is another schematic perspective view of the coil element in FIG1. ​​FIG3 is a schematic perspective view of the coil element in FIG1 with the plate omitted. FIG4 is a partially enlarged view of the coil element in FIG3. FIG5 is a schematic partial plan view of the coil element in FIG1. ​​FIG6 is a schematic cross-sectional view along section line A-A' in FIG5. FIG7 is a schematic partial side view of a coil element according to another embodiment of the present disclosure. FIG8 is a schematic partial side view of a coil element according to yet another embodiment of the present disclosure. 10: Coil element 100: core parts 110: Winding part 120: flange 121A: Inner surface 121B: Outer surface 122A, 122B, 123A, 123B: Side surface 124: Groove 130: Plate 200: Conductive seat 210: First limiter 220: Second limiter 230:Ontology 300: Wire 400: welding department P1: Middle part X, Y, Z: direction

Claims

1. A welding structure comprising: a conductive base, including: a first limiting member; and a second limiting member spaced apart from the first limiting member; a wire including a conductive portion and an insulating layer covering the conductive portion, wherein the conductive portion includes an exposed portion exposed by the insulating layer, the wire passing through the first limiting member, the exposed portion being located between the first limiting member and the second limiting member, and the second limiting member clamping one end of the wire; and a welding portion completely covering the exposed portion, the first limiting member, and the second limiting member, thereby electrically connecting the wire to the conductive base.

2. The welding structure as described in claim 1, wherein the first limiting member clamps the wire.

3. The welding structure as described in claim 1, wherein the conductive base further comprises a body connected to the first limiting member and the second limiting member.

4. The welded structure as described in claim 3, wherein the welded portion more partially covers the body.

5. The welding structure as described in claim 3, wherein the first limiting member and the second limiting member are integrally formed on the body.

6. The welding structure as described in claim 3, wherein the first limiting member includes a first extension extending from the body and a first covering extending from the first extension toward the body, and the second limiting member includes a second extension extending from the body and a second covering extending from the second extension toward the body.

7. The welding structure as described in claim 6, wherein the welded portion is separate from the first extension and the second extension.

8. The welding structure as described in claim 7, wherein a space is defined between the first extension and the second extension, and the welding portion is not disposed in the space.

9. The welding structure as described in claim 6, wherein the first extension and the first cover have a first distance, the second extension and the second cover have a second distance, and the first distance is greater than the second distance.

10. The welding structure as described in claim 6, wherein the first extension and the first cover have an included angle, and the included angle is greater than or equal to 5 degrees and less than or equal to 60 degrees.

11. The welding structure as described in claim 6, wherein an arcuate space is defined between the first extension and the first cover for accommodating the wire.

12. The welding structure as described in claim 11, wherein the first covering portion includes an arcuate segment corresponding to the arcuate space and an end segment connected to the arcuate segment, and the end segment is parallel to the first extension portion.

13. The welding structure as described in claim 1, wherein the material of the conductive part comprises copper and the material of the weld part comprises tin.

14. A coil element, comprising: a core component; a conductive base disposed on the core component, wherein the conductive base includes a first limiting member and a second limiting member spaced apart from the first limiting member; a wire wound around the core component, wherein the wire includes a conductive portion and an insulating layer covering the conductive portion, the conductive portion including an exposed portion exposed by the insulating layer, the wire passing through the first limiting member, the exposed portion being located between the first limiting member and the second limiting member, and the second limiting member clamping one end of the wire; and a welding portion completely covering the exposed portion, the first limiting member, and the second limiting member, thereby electrically connecting the wire to the conductive base.

15. The coil element as described in claim 14, wherein the core component is made of a magnetically conductive material.

16. The coil element as described in claim 14, wherein the first limiting member clamps the wire.

17. The coil element as claimed in claim 14, wherein the conductive base further comprises a body, the first limiting member comprises a first extension extending from the body and a first covering portion extending from the first extension toward the body, and the second limiting member comprises a second extension extending from the body and a second covering portion extending from the second extension toward the body.

18. The coil element as claimed in claim 17, wherein the first extension and the first cover have a first distance, the second extension and the second cover have a second distance, and the first distance is greater than the second distance.

19. The coil element as claimed in claim 17, wherein an arcuate space is defined between the first extension and the first cover for accommodating the conductor.

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