Chip electrode and transformer

Abstract

The utility model provides a chip electrode and a transformer. The chip electrode is suitable for electromagnetic devices such as a transformer and comprises a main body part, an isolation part, a welding part and a bonding part which are sequentially connected in the first direction, the welding part is used for being welded to a lead of the electromagnetic device, and the isolation part is arranged between the main body part and the welding part so that the main body part and the welding part can be oppositely arranged; the first direction is the length direction of the chip electrode, and the bonding part is used for accommodating the end of the lead extending to the chip electrode and bonding and fixing the end of the lead. The welding flux loss and the lead retraction can be prevented when the electrode and the lead are welded, and the welding strength is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic devices, and in particular to a sheet electrode and a transformer. Background Art

[0002] With the rapid development of science and technology, especially the emergence of multifunctional equipment, the demand for passive devices as a whole is increasing. As one of the passive components, electromagnetic devices are also widely used. The requirements for large current, high frequency, and high reliability are constantly upgrading. In order to meet this, the application of electromagnetic devices is becoming more and more extensive. Electromagnetic devices include at least magnets, windings, and electrodes. The electrodes are mainly used for welding with the leads of the windings, so as to realize the electrical connection between the leads and the circuit board (such as PCB, i.e. Printed Circuit Board) when the electromagnetic device performs SMT (Surface Mounted Technology) patching. When the electrode is welded to the lead, the liquid or molten solder will flow toward other areas, that is, solder loss is likely to occur, thereby affecting the welding strength; in addition, the lead is likely to retract after the solder joint melts, that is, the lead will shrink toward the winding direction, which is also likely to affect the welding strength. Utility Model Content

[0003] In view of this, the present application provides a sheet electrode and a transformer, which can improve the problems of solder loss and lead shrinkage during welding of the electrode and the lead, and the resulting impact on welding strength.

[0004] The present application provides a sheet electrode for an electromagnetic device. The sheet electrode includes a main body portion, an isolating portion, a welding portion, and an adhesive portion connected in sequence along a first direction. The welding portion is used to be welded to the lead of the electromagnetic device. The isolating portion is arranged between the main body portion and the welding portion to arrange the main body portion and the welding portion relative to each other. The first direction is the length direction of the sheet electrode. The adhesive portion is used to accommodate the end of the lead extending thereto and to adhesively fix the end of the lead.

[0005] Optionally, the sheet electrode includes a conductive body, and a first plating layer and a second plating layer stacked in sequence outside the conductive body; the first plating layer and the second plating layer cover the main body and the welding part; the isolation part is not provided with the second plating layer, or the first plating layer and the second plating layer are not provided.

[0006] Optionally, the conductive body is a copper sheet, the first plating layer is a nickel layer, and the second plating layer is a tin layer.

[0007] Optionally, the bonding portion is not provided with the second plating layer, or the first plating layer and the second plating layer are not provided.

[0008] Optionally, along the first direction, the width of the isolation portion and / or the bonding portion is smaller than the width of the welding portion.

[0009] Optionally, the first side of the main body is connected to the second side of the isolation portion, and both are adjacent to the lead of the electromagnetic device; the welding portion is provided with a third side adjacent to the lead, the third side is an arc-shaped side and is connected to the second side, and the lead extends to the welding portion through the third side.

[0010] Optionally, the welding portion is used to weld to multiple leads of the electromagnetic device, and the first side of the main body is parallel to the most adjacent lead; or, the welding portion is used to weld to a lead of the electromagnetic device, and the first side of the main body is parallel to the lead.

[0011] Optionally, the maximum widths of the main body portion and the welding portion along the second direction are equal.

[0012] The present application provides a transformer, comprising the sheet-type electrode as described in any one of the above items.

[0013] Optionally, the leads of the electromagnetic device are arranged opposite to the corresponding sides of the isolation portion.

[0014] As described above, the sheet electrode of the present application includes a main body portion, an isolation portion, a welding portion and an adhesive portion connected in sequence along the length direction of the electrode. The isolation portion is set between the main body portion and the welding portion to set the main body portion and the welding portion relative to each other, that is, to isolate them, which is equivalent to locking the welding portion, thereby preventing the solder from flowing toward areas outside the welding portion, preventing solder loss, and ensuring welding strength; in addition, the end of the lead is extended to the adhesive portion and then bonded and fixed, which can avoid lead retraction during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a sheet electrode according to an embodiment of the present application;

[0016] Figure 2 is a schematic structural diagram of a sheet electrode according to another embodiment of the present application;

[0017] Figure 3 This is a schematic structural diagram of a transformer from a first perspective according to an embodiment of the present application;

[0018] Figure 4 is a schematic structural diagram of a transformer from a second perspective according to an embodiment of the present application;

[0019] Figure 5 3 is a schematic structural diagram of a transformer according to an embodiment of the present application from a third perspective.

[0020] First direction x Second direction y Third direction z Preset direction L

[0021] Sheet electrode 1

[0022] Main body 11 Isolation part 12 Soldering part 13 Adhesive part 14 Lead part 15

[0023] Welding surface 130 Same side 110

[0024] First side 111 Second side 121 Third side 131 Fourth side 132

[0025] Electromagnetic devices 2

[0026] Winding 21 Magnet 22 Lead 210 DETAILED DESCRIPTION

[0027] In order to solve the above-mentioned technical problems existing in the prior art, in the sheet-type electrode and transformer of the present application, a main body, an isolation part, a welding part and a bonding part are provided, which are connected in sequence along the length direction of the electrode. By providing the isolation part between the main body and the welding part, the main body and the welding part are arranged relative to each other, that is, isolated, which is equivalent to locking the welding part. In this way, when the electrode and the lead are welded, it is helpful to avoid the solder flowing toward the area outside the welding part, prevent the solder from being lost, and ensure the welding strength; in addition, the end of the lead can be bonded and fixed after extending to the bonding part, so as to avoid the lead from shrinking during welding.

[0028] The specific form of the parameters such as shape, quantity, size, etc. of any of the main body, welding part, isolation part and bonding part can be determined according to the adaptability required in the actual scene.

[0029] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only some of the embodiments of this application, not all of them. Unless there is a conflict, the following embodiments and their technical features can be combined with each other and also belong to the technical solutions of this application.

[0030] In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0031] See also Figures 1 to 5 The sheet electrode 1 of this example is provided with a main body portion 11 , an isolation portion 12 , a welding portion 13 and an adhesive portion 14 , and the sheet electrode 1 is suitable for an electromagnetic device 2 .

[0032] The electromagnetic device 2 also includes a winding 21 and a magnet 22. The winding 21 can be formed by winding a lead wire 210 of a type such as an enameled wire in a circle, and the winding method is determined by adaptability; the winding 21 is set in the magnet 22, and each end of the lead wire 210 can extend outside the magnet 22 and be welded to the corresponding sheet electrode 1. For example, in Figures 3 to 5 In the example shown, the electromagnetic device 2 is a pulse transformer, the winding 21 is provided with eight terminals, and the electromagnetic device 2 is provided with six sheet electrodes 1, four of which are welded to four sheet electrodes 1 one by one, two of the remaining four terminals are welded to one sheet electrode 1, and the remaining two of the other two terminals are welded to another sheet electrode 1.

[0033] For ease of description and understanding, Figures 3 to 5 In the placement orientation shown, the height direction of the electromagnetic device 2 is referred to as the first direction x, the width direction is referred to as the second direction y, and the thickness direction is referred to as the third direction z. The first direction x, the second direction y, and the third direction z are perpendicular to each other and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the so-called perpendicularity in the entire application does not require that the angle between the two must be 90°, but rather allows for a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the angle between any two directions being 80° to 100°. Similarly, the so-called parallelism in the entire application does not require that the angle between the two must be 0° or 180°, but rather allows for a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0034] The main body 11 , the isolating portion 12 , the welding portion 13 and the adhesive portion 14 are sequentially connected along a first direction x. For the sheet electrode 1 , the first direction x is the length direction of the sheet electrode 1 .

[0035] The welding portion 13 is provided with a welding surface 130, which is used to weld to the end of the lead 210 of the electromagnetic device 2. In one example, the welding surface 130 can be the entire outer surface of the welding portion 13, that is, the xy surface. After the lead 210 of the electromagnetic device 2 extends from the magnet 22, it extends along a predetermined direction L to the welding surface 130 of the welding portion 13 and welds to the welding surface 130.

[0036] The isolation portion 12 is disposed between the main body 11 and the soldering portion 13 to position them relative to each other. This relative positioning means that the distance between the main body 11 and the soldering portion 13 along the first direction x is greater than zero, i.e., the two are isolated. The isolation portion 12 between the main body 11 and the soldering portion 13 effectively locks the soldering portion. This helps prevent solder from flowing outside of the soldering portion 13 when soldering the lead 210 to the soldering portion 13, preventing solder loss and ensuring solder strength.

[0037] In one example, the sheet electrode 1 can define the isolating portion 12 by setting the area where the isolating portion 12 is located lower than the main body 11 and the welding portion 13. That is, the outer surfaces of the isolating portion 12 are not coplanar with those of the main body 11 and the welding portion 13. Instead, the outer surface of the isolating portion 12 is lower than the outer surfaces of the main body 11 and the welding portion 13, and the outer surfaces of the main body 11 and the welding portion 13 can be flush. For example, the sheet electrode 1 can include a conductive body and a first plating layer and a second plating layer stacked sequentially on the outside of the conductive body. Optionally, the conductive body is a copper sheet, the first plating layer is a nickel layer, and the second plating layer is a tin layer. The first and second plating layers cover the main body 11 and the welding portion 12, but do not cover the conductive body in the area where the isolating portion 12 is located, thereby forming the isolating portion 12. In this case, the isolating portion 12 is not provided with the first and second plating layers. Of course, in other examples, the isolating portion 12 can be defined by only the first or second plating layer not covering the conductive body in the area where the isolating portion 12 is located.

[0038] The bonding portion 14 is used to accommodate the end of the lead 210 extending therefrom and to bond and secure the end of the lead 210. For example, the end of the lead 210 can be bonded and secured using high-temperature insulating glue, which can be wrapped around the end of the lead 210. Therefore, when the lead 210 is welded to the welding portion 13, the end of the lead 210 is bonded and secured, thereby preventing the lead from retracting during welding.

[0039] In one example, the sheet electrode 1 can define the bonding portion 14 by setting the area where the bonding portion 14 is located lower than the welding portion 13. That is, the outer surface of the bonding portion 14 and the welding portion 13 are not on the same plane, but the outer surface of the bonding portion 14 is lower than the outer surface of the welding portion 13. For example, in a scenario where the sheet electrode 1 includes a conductive body, and a first plating layer and a second plating layer sequentially stacked outside the conductive body, the first plating layer and the second plating layer cover the welding portion 12, but do not cover the conductive body in the area where the bonding portion 14 is located, thereby forming the bonding portion 14, and at this time, the bonding portion 14 is not provided with the first plating layer and the second plating layer; of course, other examples can define the formation of the bonding portion 14 only by the first plating layer or the second plating layer not covering the conductive body in the area where the bonding portion 14 is located.

[0040] In one example, if Figures 1 to 5 As shown, the width of the isolation portion 12 (i.e., its length along the first direction x) can be smaller than the width of the soldering portion 13 (i.e., its length along the first direction x). Therefore, the smaller width of the isolation portion 12 prevents solder loss while not affecting the performance of the entire sheet electrode 1. Similarly, the width of the bonding portion 14 can also be smaller than the width of the soldering portion 13.

[0041] Please continue reading Figures 1 to 5 As shown, the side of the isolation portion 12 adjacent to the lead 210 can be recessed in the main body portion 13 and the welding portion 13. The so-called recess can be understood as: on the side adjacent to the lead 210, the side of the isolation portion 12 and the side of the main body portion 13 and the welding portion 13 are not a straight line parallel to the second direction y, and the side of the isolation portion 12 is recessed in the direction away from the lead 210.

[0042] For example, in Figures 1 to 5 In the example, the first side 111 of the main body 11 is connected to the second side 121 of the isolation portion 12, and both are adjacent to the lead 210 of the electromagnetic device 2; the welding portion 13 is provided with a third side 131 adjacent to the lead 210, and the third side 131 is an arc-shaped side and is connected to the second side 121 of the isolation portion 12, and the lead 210 extends to the welding portion 13 via the third side 131 of the welding portion 13.

[0043] The recessed design is equivalent to narrowing the heat transfer channel between the welding portion 13 and the main body 11, which can reduce the heat generated by the welding of the welding portion 13 and transferred to the main body 11 and the electromagnetic device 2, that is, achieving thermal isolation, improving or even eliminating the impact of this high temperature on the inductance performance.

[0044] Please continue reading Figures 1 to 5 The main body 11 can be flush with the welding portion 13 , so that when the sheet electrode 1 is assembled in the electromagnetic device 2 , the welding surface 130 of the welding portion 13 is flush with the same side surface 110 of the main body 11 .

[0045] The chip electrode 1 may further include a pin portion 15, which is connected to one end of the main body 11 facing away from the isolation portion 12, and the pin portion 15 extends along the third direction z. When the chip electrode 1 is assembled on the magnet 22, the pin portion 15 can serve as a patch electrode of the electromagnetic device 2, or a patch pin. For a scenario where a single chip electrode 1 (referred to as the "first chip electrode 1") is connected to multiple leads 210, for example Figure 1 、 Figures 3 to 5 When the single chip electrode 1 shown is connected to two leads 210, the number of the pin portion 15 can be one, and the pin portion 15 is relatively arranged along the second direction y. Figure 2In the illustrated one-piece electrode 1 (referred to as “second-piece electrode 1 ”) connected to a single lead 210 , the width of the lead portion 15 of the second-piece electrode 1 is smaller than the width of the lead portion 15 of the first-piece electrode 1 .

[0046] Optionally, for any one-piece electrode 1, the maximum widths of the main body 11 and the welding portion 13 (i.e., the maximum width along the second direction y) may be equal. When the welding portion 13 is used to weld to multiple leads 210 of the electromagnetic device 2, the first side 111 of the main body 11 is parallel to the most adjacent lead 210. When the welding portion 13 is used to weld to a single lead 210 of the electromagnetic device 2, the first side 111 of the main body 11 is parallel to the lead 210.

[0047] The embodiment of the present application also provides a transformer, comprising a magnet and a sheet electrode 1 as described in any of the above examples, so the transformer at least has the beneficial effects produced by the sheet electrode 1 of the corresponding example, which will not be described in detail here. Figures 1 to 5 As shown, in an electromagnetic device 2 such as a transformer, a device having Figure 1 The first sheet electrode 1 and Figure 2 The second sheet electrode 1 is shown; in addition, when the sheet electrode 1 of any of the aforementioned examples is assembled on the magnet 22, the main body 11, the isolation portion 12, the welding portion 13 and the adhesive portion 14 of the single sheet electrode 1 are located on the same side of the magnet 22, and the lead 210 of the electromagnetic device 2 is arranged relative to the side corresponding to the isolation portion 12 (i.e., the second side 121).

[0048] The above descriptions are only some embodiments of the present application and do not limit the patent scope of the present application. For ordinary technicians in this field, any equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0049] Although the terms "first," "second," and the like are used herein to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. In addition, the singular forms "a," "an," and "the" are intended to include the plural forms as well. The terms "or" and "and / or" are to be interpreted as inclusive, meaning any one or any combination. Exceptions to this definition occur only when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

Claims

1. A sheet electrode for an electromagnetic device, characterized in that: It includes a main body part, an isolation part, a welding part and an adhesive part connected in sequence along a first direction, the welding part is used to be welded to the lead of the electromagnetic device, the isolation part is arranged between the main body part and the welding part to arrange the main body part and the welding part relative to each other, the first direction is the length direction of the sheet electrode, and the adhesive part is used to accommodate the end of the lead extended thereto and adhesively fix the end of the lead.

2. The sheet electrode according to claim 1, characterized in that The sheet electrode comprises a conductive body, and a first plating layer and a second plating layer sequentially stacked outside the conductive body; The first plating layer and the second plating layer cover the main body and the welding portion; The isolation portion is not provided with the second plating layer, or is not provided with the first plating layer and the second plating layer.

3. The sheet electrode according to claim 2, characterized in that: The conductive body is a copper sheet, the first plating layer is a nickel layer, and the second plating layer is a tin layer.

4. The sheet electrode according to claim 2, characterized in that: The bonding portion is not provided with the second plating layer, or is not provided with the first plating layer and the second plating layer.

5. The sheet electrode according to any one of claims 1 to 4, characterized in that: Along the first direction, the width of the isolation portion and / or the bonding portion is smaller than the width of the welding portion.

6. The sheet electrode according to claim 5, characterized in that: The first side of the main body is connected to the second side of the isolation part, and both are adjacent to the lead of the electromagnetic device; the welding part is provided with a third side adjacent to the lead, the third side is an arc-shaped side and is connected to the second side, and the lead extends to the welding part through the third side.

7. The sheet electrode according to claim 6, characterized in that: The welding portion is used to weld to a plurality of leads of the electromagnetic device, and the first side of the main body is parallel to the most adjacent lead; or, The welding portion is used for welding to a lead of the electromagnetic device, and the first side of the main body is parallel to the lead.

8. The sheet electrode according to claim 5, characterized in that: The main body portion and the welding portion have the same maximum width along a second direction, where the second direction is a width direction of the electromagnetic component and is perpendicular to the first direction.

9. A transformer, characterized in that: A sheet electrode comprising the sheet electrode according to any one of claims 1 to 8.

10. The transformer according to claim 9, characterized in that The leads of the electromagnetic device are arranged opposite to the corresponding sides of the isolation portion.

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