Welding-free thin film capacitor

Abstract

The utility model provides a welding-free film capacitor, which comprises a capacitor core in a cylindrical structure. The end faces of the two sides of the capacitor core are connected with leading-out terminals, and the leading-out terminals extend in the direction away from the capacitor core. The end, away from the capacitor core, of the leading-out terminal is a plugging end, the plugging end is of an annular structure, a first opening is formed in the middle of the plugging end, a plurality of point positions are distributed on the inner wall of the first opening along the circumferential surface, and a supporting piece of a support type structure is connected between the point positions. In the process of pressing the plug-in end into the lead hole, the plug-in end deforms to enable the plug-in end and the lead hole to form interference fit, so that tight connection between the leading-out terminal and the lead hole is realized. Since the leading-out terminal does not need to be welded in the lead hole by welding flux, the problem of splashing of the soldering flux can be avoided. The supporting member supports the plugging end of the leading-out terminal in a plurality of directions, thereby improving the supporting strength of the plugging end of the leading-out terminal, and enabling the leading-out terminal to be higher in firmness.

Description

TECHNICAL FIELD

[0001] The utility model relates to capacitor technical field especially relates to a welding free film capacitor. BACKGROUND

[0002] Film capacitor as basic passive component is widely used in electronic equipment and other fields, wherein the pin type film capacitor is particularly common in the field of electronic equipment, and the pin type film capacitor is composed of capacitor core, lead wire, capacitor shell and encapsulating resin.

[0003] The installation mode of film capacitor is generally that a plurality of capacitors are connected in series and parallel, and the circuit board is welded together through solder, and the film capacitor is required not to be loose due to vibration or other mechanical force. The film capacitor also provides electrical continuity, that is, the continuous conduction of the electrical system, so that the film capacitor can pass through the connection without interruption to meet the functional requirements. In the whole welding process, wave soldering and reflow soldering processes are adopted, if the welding process temperature fluctuates too much, the reliability of welding will be affected, and the welding cost is relatively high. In the welding process, the flux may splash, and cleaning operation is needed after the welding is completed. In addition, the firmness of the lead-out terminal of the capacitor core may be affected after being inserted into the lead-out hole of the circuit board for many times, and the lead-out terminal may be broken when being inserted into the lead-out hole of the circuit board next time.

[0004] Therefore, a film capacitor is needed, which can insert the lead-out terminal into the lead-out hole of the circuit board without welding, and the lead-out terminal still has strong firmness after being inserted into the lead-out hole of the circuit board for many times. Utility model content

[0005] In order to overcome the problems in the related art, the utility model aims at providing a welding free film capacitor, which can insert the lead-out terminal into the PCB hole without welding, and the lead-out terminal still has strong firmness after being inserted into the PCB hole for many times.

[0006] A welding free film capacitor, comprising a capacitor core, the capacitor core is a cylindrical structure, the end faces on both sides of the capacitor core are connected with lead-out terminals, the lead-out terminals extend away from the capacitor core, the end of the lead-out terminal away from the capacitor core is a plug-in end, the plug-in end is a ring structure, a first opening is formed in the middle of the plug-in end to provide a deformation allowance when the plug-in end is stressed, the inner wall of the first opening is distributed with a plurality of point positions along the circumference, and a support is connected between the plurality of point positions, all the point positions are arranged along the extension direction of the inner wall of the first opening to form a convex figure, and the support is a bracket type structure forming an included angle with the inner wall of the first opening.

[0007] In the preferable technical scheme of the utility model, the first opening comprises annular side wall and first horizontal part, the first horizontal part is located at the side of the first opening far from the capacitor core, and the first horizontal part is connected with the annular side wall.

[0008] In the preferable technical scheme of the utility model, the first opening further comprises second horizontal part, and the second horizontal part is located at the side of the first opening close to the capacitor core.

[0009] In the preferable technical scheme of the utility model, the support piece comprises first reinforcing rib and second reinforcing rib, the two opposite annular side walls are connected with the first end of the first reinforcing rib and the first end of the second reinforcing rib respectively, and the second end of the first reinforcing rib and the second end of the second reinforcing rib are connected to the first horizontal part.

[0010] In the preferable technical scheme of the utility model, the included angle between the first reinforcing rib and the second reinforcing rib is 12°-60°.

[0011] In the preferable technical scheme of the utility model, a transition surface is arranged between the second horizontal part and the annular side wall, and the two sides of the transition surface are connected with the second horizontal part and the annular side wall respectively.

[0012] In the preferable technical scheme of the utility model, the end faces on the two sides of the capacitor core are provided with welding layers, and the lead-out terminals are welded on the welding layers.

[0013] In the preferable technical scheme of the utility model, one end of the lead-out terminal welded with the welding layer is a connecting end, the connecting end is annular structure, and a second opening is formed in the middle part of the connecting end.

[0014] In the preferable technical scheme of the utility model, the lead-out terminal further comprises an extension part, the extension part is located between the plug-in end and the connecting end, and the two ends of the extension part are connected with the plug-in end and the connecting end respectively, or the extension part, the plug-in end and the connecting end are integrally formed.

[0015] In the preferable technical scheme of the utility model, the welding-free film capacitor further comprises a shell, the capacitor core is arranged in the shell, a wire outlet is formed in the top of the shell, the capacitor core is filled with potting glue between the capacitor core and the wire outlet, a plurality of lead-out terminals pass through the potting glue and the wire outlet and extend out from the same side of the shell.

[0016] The utility model has the advantages of:

[0017] The utility model provides a kind of welding-free film capacitor, including capacitor core, the capacitor core is cylindrical structure;The end face of capacitor core two sides is connected with lead-out terminal, the lead-out terminal extends towards the direction away from the capacitor core;The end of lead-out terminal away from the capacitor core is plug-in terminal, the plug-in terminal is annular structure;The middle part of plug-in terminal is equipped with first opening, to provide the deformation allowance when plug-in terminal is stressed, the inner wall of first opening is distributed with multiple point positions along circumference surface, and the multiple point positions are connected with support piece;All the point positions are arranged along the extension direction of the inner wall of first opening, form convex figure;The support piece is the bracket type structure formed with the inner wall of first opening Angle.This utility model's plug-in terminal of lead-out terminal is annular structure, annular structure is adapted with lead hole on circuit board, in the process of pressing plug-in terminal of lead-out terminal into lead hole, plug-in terminal produces deformation and makes plug-in terminal and lead hole form interference fit, to realize the close connection of lead-out terminal and lead hole.The utility model does not need to use solder to weld lead-out terminal in lead hole, thus need not use flux, can avoid the problem that flux splashes in welding process, also need not clean flux after welding, save the cost required for welding.In first opening, support piece is arranged, and support piece is connected with multiple point positions of the inner wall of first opening, to support plug-in terminal of lead-out terminal in multiple directions, to improve the support strength of plug-in terminal of lead-out terminal, so that lead-out terminal still has strong firmness after being inserted into lead-out hole of circuit board multiple times. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic view of capacitor core of the utility model;

[0019] Figure 2 It is Figure 1 The enlarged view of A in

[0020] Figure 3 It is the structure schematic view of welding-free film capacitor of the utility model;

[0021] Figure 4 It is the front view of welding-free film capacitor of the utility model;

[0022] Figure 5 It is the plan view of welding-free film capacitor of the utility model;

[0023] Figure 6 It is Figure 5 The sectional view along A-A direction.

[0024] Reference numerals: 1. Capacitor core; 2. Lead-out terminal; 3. Plug-in terminal; 4. First opening; 5. Support member; 6. Annular sidewall; 7. First horizontal part; 8. Second horizontal part; 9. First reinforcing rib; 10. Second reinforcing rib; 11. Transition surface; 12. Welding layer; 13. Connection end; 14. Second opening; 15. Extension part; 16. Outer shell; 17. Outlet; 18. Encapsulating glue. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0026] Example 1

[0027] like Figures 1-6 As shown, this embodiment provides a solderless film capacitor, including a capacitor core 1, which is a cylindrical structure; lead terminals 2 are connected to the end faces on both sides of the capacitor core 1, and the lead terminals 2 extend away from the capacitor core 1; the end of the lead terminal 2 away from the capacitor core 1 is a plug-in end 3, which is an annular structure; a first opening 4 is provided in the middle of the plug-in end 3 to provide deformation allowance when the plug-in end 3 is subjected to force; multiple points are distributed along the circumference of the inner wall of the first opening 4, and a support member 5 is connected between the multiple points; all the points are arranged along the extension direction of the inner wall of the first opening 4 to form a convex shape; the support member 5 is a bracket-type structure that forms an angle with the inner wall of the first opening 4.

[0028] A cylindrical capacitor core 1 is vertically arranged, and the lead-out terminals 2 of the capacitor core 1 extend along the height direction. One end of the lead-out terminal 2 is connected to the end face of the capacitor core 1, and the other end is a plug-in terminal 3. The lead-out terminal 2 has a ring-shaped structure, and its shape is elliptical or circular.

[0029] Because the connector 3 has an arc-shaped surface, it is compatible with the lead hole of the circuit board. When the connector 3 is inserted into the lead hole of the circuit board, it deforms and abuts against the inner wall of the lead hole, forming an interference fit.

[0030] The lead-out terminal 2 is made of one or more materials selected from brass, copper, and oxygen-free copper, and is conductive. The torque of the insertion end 3 of the lead-out terminal 2 into the lead hole is controlled to ensure a tight connection between the insertion end 3 and the lead hole, thereby connecting the capacitor core 1 to the circuit on the circuit board.

[0031] The middle part of the plug-in end 3 is provided with a first opening 4, and a supporting piece 5 is arranged in the first opening 4. The supporting piece 5 is connected with a plurality of point positions of the inner wall of the first opening 4, so that the supporting piece 5 supports the plug-in end 3 in multiple directions, thereby improving the supporting strength of the plug-in end 3. After the plug-in end 3 of the lead-out terminal 2 is inserted into the lead hole on the circuit board for multiple times, the lead-out terminal 2 still has strong firmness, and the plug-in end 3 can be prevented from being broken.

[0032] The convex figure includes a triangle and a trapezoid, and the number of point positions can be 3 or more than 3, for example, 5. The number of point positions is set according to the needs of the application scene. When the number of point positions is 3, one point position is randomly selected from the 3 point positions, and the point position is taken as a starting point position. All point positions are connected in a head-tail manner along the extension direction of the inner wall of the first opening 4 from the starting point position, and a triangle is obtained. When the number of point positions is 5, one point position is randomly selected from the 5 point positions, and the point position is taken as a starting point position. All point positions are connected in a head-tail manner along the extension direction of the inner wall of the first opening 4 from the starting point position, and a trapezoid is obtained.

[0033] The supporting piece 5 is connected between the plurality of point positions, that is, the point at which the supporting piece 5 contacts the inner wall of the first opening 4 is a point position, and different parts of the supporting piece 5 form different angles with the inner wall of the first opening 4. When the plug-in end 3 is inserted into the lead hole on the circuit board, the inner wall of the lead hole will extrude the outer side of the plug-in end 3, and the plug-in end 3 will be displaced towards the center of the first opening 4, so that the plug-in end 3 will be deformed. The first opening 4 provides a deformation allowance for the plug-in end 3 under stress. The supporting piece 5 is a bracket type structure. When the outer side of the plug-in end 3 is stressed, the supporting piece 5 is extruded inward, and the supporting piece 5 applies a counterforce to the inner wall of the first opening 4 to reduce the deformation of the plug-in end 3 and prevent the plug-in end 3 from being broken due to excessive deformation. Therefore, the supporting piece 5 can improve the supporting strength of the plug-in end 3 when the lead-out terminal 2 is inserted into the lead hole of the circuit board.

[0034] When the plug-in end 3 is inserted into the lead hole of the circuit board, the plug-in end 3 abuts against the inner wall of the lead hole, and the inner wall of the lead hole extrudes the outer side of the plug-in end 3, that is, the inner wall of the lead hole applies a force to the outer side of the plug-in end 3. At this time, the supporting piece 5 applies a supporting force to the inner side of the plug-in end 3 to balance the force applied by the inner wall of the lead hole, so as to prevent the outer side of the plug-in end 3 from being deformed too much and broken when subjected to a large force, thereby prolonging the service life of the film capacitor.

[0035] This embodiment provides a solderless film capacitor, including a capacitor core 1, which is cylindrical in shape. Lead terminals 2 are connected to both ends of the capacitor core 1, extending away from the capacitor core 1. One end of the lead terminal 2 away from the capacitor core 1 is a plug-in end 3, which is annular in shape. A first opening 4 is provided in the middle of the plug-in end 3 to provide deformation allowance when the plug-in end 3 is subjected to force. Multiple points are distributed along the circumference of the inner wall of the first opening 4, and support members 5 are connected between these points. All the points are arranged along the extending direction of the inner wall of the first opening 4, forming a convex shape. The support member 5 is a bracket-type structure that forms an angle with the inner wall of the first opening 4. The insertion end 3 of the lead-out terminal 2 of this invention has a ring-shaped structure, which is adapted to the lead hole on the circuit board. During the process of pressing the insertion end 3 of the lead-out terminal 2 into the lead hole, the insertion end 3 deforms, forming an interference fit between the insertion end 3 and the lead hole, thereby achieving a tight connection between the lead-out terminal 2 and the lead hole. This invention eliminates the need for soldering the lead-out terminal 2 into the lead hole, thus eliminating the need for flux and avoiding flux splattering during soldering. It also eliminates the need to clean the flux after soldering, saving on soldering costs. A support member 5 is provided in the first opening 4, and the support member 5 is connected to multiple points on the inner wall of the first opening 4 to support the insertion end 3 of the lead-out terminal 2 in multiple directions, thereby improving the support strength of the insertion end 3 of the lead-out terminal 2 and ensuring that the lead-out terminal 2 still has strong stability after being inserted into the lead hole of the circuit board multiple times.

[0036] Example 2

[0037] like Figures 1-6 As shown, this embodiment provides a solderless film capacitor, including a capacitor core 1, which is a cylindrical structure; lead terminals 2 are connected to the end faces on both sides of the capacitor core 1, and the lead terminals 2 extend away from the capacitor core 1; the end of the lead terminal 2 away from the capacitor core 1 is a plug-in end 3, which is an annular structure; a first opening 4 is provided in the middle of the plug-in end 3 to provide deformation allowance when the plug-in end 3 is subjected to force; multiple points are distributed along the circumference of the inner wall of the first opening 4, and a support member 5 is connected between the multiple points; all the points are arranged along the extension direction of the inner wall of the first opening 4 to form a convex shape; the support member 5 is a bracket-type structure that forms an angle with the inner wall of the first opening 4.

[0038] The first opening 4 includes an annular sidewall 6 and a first horizontal portion 7. The first horizontal portion 7 is located on the side of the first opening 4 away from the capacitor core 1, and the first horizontal portion 7 is connected to the annular sidewall 6.

[0039] The first opening 4 further comprises a second horizontal part 8, which is located on the side of the first opening 4 close to the capacitor core 1.

[0040] The first opening 4 comprises two ring-shaped side walls 6 arranged oppositely, and the first horizontal part 7 is a plane, and the first horizontal part 7 and the second horizontal part 8 are arranged oppositely. The first horizontal part 7, the second horizontal part 8 and the two ring-shaped side walls 6 form the first opening 4, and after the plug-in end 3 is inserted into the lead hole of the circuit board, the plug-in end 3 is rotated to form an interference fit with the lead hole.

[0041] The first opening 4 provides a space for accommodating the support 5, and the support 5 is connected with the first horizontal part 7 and the two ring-shaped side walls 6 to support the plug-in end 3 of the lead-out terminal 2. When the plug-in end 3 is inserted into the lead hole, the inner wall of the lead hole extrudes the plug-in end 3, that is, the inner wall of the lead hole exerts a force on the outer side of the plug-in end 3, so that the plug-in end 3 deforms. At this time, the support 5 exerts a supporting force on the inner side of the plug-in end 3 to balance the force on the outer side of the plug-in end 3, thereby preventing the plug-in end 3 from being broken due to excessive deformation.

[0042] The multiple included angles formed between the support 5 and the inner wall of the first opening 4 are all acute angles. For example, the included angle formed between the first reinforcing rib 9 and the first horizontal part 7 is 70°, and the included angle formed between the ring-shaped side wall 6 connected with the first reinforcing rib 9 and the first reinforcing rib 9 is 30°. The included angle formed between the second reinforcing rib 10 and the first horizontal part 7 is 70°, and the included angle formed between the ring-shaped side wall 6 connected with the second reinforcing rib 10 and the second reinforcing rib 10 is 30°, and the included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is 40°.

[0043] The first opening 4 of the embodiment comprises a ring-shaped side wall 6 and a first horizontal part 7, which is located on the side of the first opening 4 away from the capacitor core 1, and the first horizontal part 7 is connected with the ring-shaped side wall 6. The first opening 4 further comprises a second horizontal part 8, which is located on the side of the first opening 4 close to the capacitor core 1. When the plug-in end 3 is inserted into the lead hole, the inner wall of the lead hole extrudes the plug-in end 3, that is, the inner wall of the lead hole exerts a force on the outer side of the plug-in end 3, so that the plug-in end 3 deforms. At this time, the support 5 exerts a supporting force on the inner side of the plug-in end 3 to balance the force on the outer side of the plug-in end 3, thereby preventing the plug-in end 3 from being broken due to excessive deformation.

[0044] Embodiment 3

[0045] As Figures 1-6As shown, the embodiment provides a kind of welding-free film capacitor, including capacitor core 1, the capacitor core 1 is cylindrical structure;The end face of the capacitor core 1 both sides is connected with lead-out terminal 2, the lead-out terminal 2 extends in the direction away from the capacitor core 1;The end of the lead-out terminal 2 away from the capacitor core 1 is plug-in end 3, the plug-in end 3 is annular structure;First opening 4 is set in the middle part of the plug-in end 3, to provide the deformation allowance of plug-in end 3 when being stressed, the inner wall of the first opening 4 is distributed with multiple point positions along the circumferential surface, and the multiple point positions are connected with support piece 5;All the point positions are arranged along the extension direction of the inner wall of the first opening 4, form convex figure;The support piece 5 is the support type structure with the inner wall of the first opening 4 forms angle.

[0046] The first opening 4 includes annular side wall 6 and first horizontal part 7, and the first horizontal part 7 is located at the side of the first opening 4 away from the capacitor core 1, and the first horizontal part 7 is connected with the annular side wall 6.

[0047] The support piece 5 includes first reinforcing rib 9 and second reinforcing rib 10, and the first end of the first reinforcing rib 9 and the first end of the second reinforcing rib 10 are connected with the two opposite annular side walls 6 respectively, and the second end of the first reinforcing rib 9 and the second end of the second reinforcing rib 10 are connected to the first horizontal part 7.

[0048] The angle between the first reinforcing rib 9 and the second reinforcing rib 10 is 12°-60°, the first end of the first reinforcing rib 9 is connected with the first annular side wall 6, the first end of the second reinforcing rib 10 is connected with the second annular side wall 6, and the first annular side wall 6 and the second annular side wall 6 are opposite. The second end of the first reinforcing rib 9 and the second end of the second reinforcing rib 10 can be located at the same point on the first horizontal part 7, or can be located at two different points on the first horizontal part 7, that is, there is a gap between the second end of the first reinforcing rib 9 and the second end of the second reinforcing rib 10.

[0049] When the positions of the second end of the first reinforcing rib 9 and the second end of the second reinforcing rib 10 are fixed, and the heights of the first end of the first reinforcing rib 9 and the first end of the second reinforcing rib 10 are the same, the greater the angle between the first reinforcing rib 9 and the second reinforcing rib 10, the shorter the length of the first reinforcing rib 9 and the second reinforcing rib 10, that is, the first end of the first reinforcing rib 9 and the first end of the second reinforcing rib 10 are closer to the first horizontal part 7.

[0050] The included angle between the first reinforcing rib 9 and the second reinforcing rib 10 can be an integer multiple of 12°, and the maximum included angle is 60°, that is, the included angle is 12°, 24°, 36°, 48° or 60°, or the included angle can continuously vary within 12°-60°. When the included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is large, the first reinforcing rib 9 and the second reinforcing rib 10 will disperse the external force on the plug-in end 3 to the upper part of the annular side wall 6; when the included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is small, the first reinforcing rib 9 and the second reinforcing rib 10 will disperse the external force on the plug-in end 3 to the lower part of the annular side wall 6. The upper part of the annular side wall 6 is the part of the annular side wall 6 close to the first horizontal part 7, and the lower part of the annular side wall 6 is the part of the annular side wall 6 close to the second horizontal part 8.

[0051] The second horizontal part 8 and the annular side wall 6 are provided with a transition surface 11, and the two sides of the transition surface 11 are connected with the second horizontal part 8 and the annular side wall 6, respectively.

[0052] The transition surface 11 can be perpendicular to the second horizontal part 8, or form an included angle less than 90° with the second horizontal part 8, which is not limited here. One side of the transition surface 11 is connected with the annular side wall 6, and the other side is connected with the second horizontal part 8. The two sides of the second horizontal part 8 are respectively connected with one transition surface 11. The second horizontal part 8 is arranged opposite to the first horizontal part 7, and preferably, the second horizontal part 8 is parallel to the first horizontal part 7.

[0053] The first end of the first reinforcing rib 9 of the embodiment is located at the junction of the first annular side wall 6 and the corresponding transition surface 11, and the first end of the second reinforcing rib 10 is located at the junction of the second annular side wall 6 and the corresponding transition surface 11. The transition surface 11 and the annular side wall 6 jointly support the first reinforcing rib 9 and the second reinforcing rib 10.

[0054] The support 5 of the embodiment includes the first reinforcing rib 9 and the second reinforcing rib 10, and the two opposite annular side walls 6 are respectively connected with the first end of the first reinforcing rib 9 and the first end of the second reinforcing rib 10. The second end of the first reinforcing rib 9 and the second end of the second reinforcing rib 10 are both connected to the first horizontal part 7. The included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is 12°-60°. When the included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is large, the first reinforcing rib 9 and the second reinforcing rib 10 will disperse the external force on the plug-in end 3 to the upper part of the annular side wall 6; when the included angle between the first reinforcing rib 9 and the second reinforcing rib 10 is small, the first reinforcing rib 9 and the second reinforcing rib 10 will disperse the external force on the plug-in end 3 to the lower part of the annular side wall 6. The upper part of the annular side wall 6 is the part of the annular side wall 6 close to the first horizontal part 7, and the lower part of the annular side wall 6 is the part of the annular side wall 6 close to the second horizontal part 8.

[0055] Example 4

[0056] like Figures 1-6 As shown, this embodiment provides a solderless film capacitor, including a capacitor core 1, which is a cylindrical structure; lead terminals 2 are connected to the end faces on both sides of the capacitor core 1, and the lead terminals 2 extend away from the capacitor core 1; the end of the lead terminal 2 away from the capacitor core 1 is a plug-in end 3, which is an annular structure; a first opening 4 is provided in the middle of the plug-in end 3 to provide deformation allowance when the plug-in end 3 is subjected to force; multiple points are distributed along the circumference of the inner wall of the first opening 4, and a support member 5 is connected between the multiple points; all the points are arranged along the extension direction of the inner wall of the first opening 4 to form a convex shape; the support member 5 is a bracket-type structure that forms an angle with the inner wall of the first opening 4.

[0057] The capacitor core 1 has a welding layer 12 on both sides of its end face, and the lead-out terminal 2 is welded to the welding layer 12.

[0058] The end of the lead-out terminal 2 that is welded to the welding layer 12 is the connection end 13. The connection end 13 has a ring structure and a second opening 14 is provided in the middle of the connection end 13.

[0059] The lead-out terminal 2 also includes an extension 15, which is located between the plug-in terminal 3 and the connecting terminal 13. The two ends of the extension 15 are respectively connected to the plug-in terminal 3 and the connecting terminal 13, or the extension 15, the plug-in terminal 3 and the connecting terminal 13 are integrally formed.

[0060] Metal material is applied to the two end faces of the capacitor core 1 using a spraying method, forming two solder layers 12. Each solder layer 12 has K leads 2 soldered onto it, where K ≥ 1 and K is a positive integer; in this embodiment, K = 1 is used as an example. The leads 2 connect the capacitor core 1 to the circuitry on the circuit board, with each lead 2 electrically connected to a different location on the circuit board.

[0061] Both the connecting end 13 and the plug-in end 3 of the lead-out terminal 2 have the same annular structure. The difference is that the second opening 14 of the connecting end 13 does not have a support member 5, while the first opening 4 of the plug-in end 3 has a first reinforcing rib 9 and a second reinforcing rib 10.

[0062] The welding layer 12 on both sides of the capacitor core 1 is welded with the connecting end 13 of the lead terminal 2, the first end of the extension part 15 is connected with or integrally formed with the connecting end 13, and the second end of the extension part 15 is connected with or integrally formed with the plug-in end 3. The extension part 15 is in the shape of I, the part of the extension part 15 connected with or integrally formed with the plug-in end 3 is a straight plate, and the part of the extension part 15 connected with or integrally formed with the connecting end 13 is another straight plate. A vertical plate is arranged between the two straight plates, the first end of the vertical plate is connected with the first straight plate, i.e., the straight plate away from the welding layer 12, the second end of the vertical plate is connected with the second straight plate, i.e., the straight plate close to the welding layer 12, and the two sides of the vertical plate are enclosed with the two straight plates to form a C-shaped opening.

[0063] The extension part 15 can not be welded on the welding layer 12, or can be partially welded on the welding layer 12, which is not limited here. The extension part 15 extends from the part welded with the connecting end 13 in the direction away from the capacitor core 1. The extension part 15 is used to lengthen the lead terminal 2 and lead out the plug-in end 3. According to the model of the capacitor core 1 and the relative position of the capacitor core 1 and the circuit board, the length of the corresponding extension part 15 is designed to adapt the capacitor core 1 to the application scenario.

[0064] The end surface on both sides of the capacitor core 1 in the embodiment is provided with the welding layer 12, and the lead terminal 2 is welded on the welding layer 12. The end of the lead terminal 2 welded with the welding layer 12 is the connecting end 13, the connecting end 13 is in the shape of a ring, and a second opening 14 is arranged in the middle of the connecting end 13. The lead terminal 2 further includes the extension part 15, the extension part 15 is located between the plug-in end 3 and the connecting end 13, and the two ends of the extension part 15 are respectively connected with the plug-in end 3 and the connecting end 13, or the extension part 15, the plug-in end 3 and the connecting end 13 are integrally formed. The connecting end 13 can lead out the lead terminal 2 while firmly welding the lead terminal 2 on the welding layer 12. The extension part 15 is used to lengthen the lead terminal 2, so as to connect the capacitor core 1 to the circuit on the circuit board.

[0065] Embodiment 5

[0066] As Figures 1-6As shown, the embodiment provides a welding-free film capacitor, which comprises a capacitor core 1, the capacitor core 1 is a cylindrical structure; the end faces of the capacitor core 1 are connected with lead terminals 2, the lead terminals 2 extend away from the capacitor core 1; the end of the lead terminal 2 away from the capacitor core 1 is a plug-in end 3, the plug-in end 3 is a ring structure; a first opening 4 is arranged in the middle of the plug-in end 3 to provide a deformation allowance when the plug-in end 3 is stressed, the inner wall of the first opening 4 is provided with a plurality of point positions distributed along the circumference, and a support 5 is connected between the plurality of point positions; all the point positions are arranged along the extension direction of the inner wall of the first opening 4 to form a convex pattern; the support 5 is a bracket type structure forming an angle with the inner wall of the first opening 4.

[0067] The welding-free film capacitor further comprises a shell 16, the capacitor core 1 is arranged in the shell 16, a wire outlet 17 is arranged at the top of the shell 16; the capacitor core 1 and the wire outlet 17 are filled with potting glue 18, a plurality of lead terminals 2 pass through the potting glue 18 and the wire outlet 17 and extend out of the same side of the shell 16.

[0068] The shell 16 is made of PBT, PC or PPS engineering plastic and is used for accommodating the capacitor core 1. The capacitor core 1 of the utility model is a thin film capacitor core 1 made of PP, PET or PPS stretchable plastic film through a series of production processes. The metal material is attached to the two end faces of the capacitor core 1 in a spraying manner, the lead terminal 2 is made of one or more materials selected from brass, red copper and oxygen-free copper, the connecting end 13 of the lead terminal 2 is welded on the welding layer 12 in a resistance welding or soldering manner, and the plug-in end 3 of the lead terminal 2 has a certain elasticity.

[0069] The potting glue 18 is a filling material of the welding-free film capacitor and is made of epoxy resin and polyurethane materials. After the capacitor core 1 is placed in the shell 16 in a vertical manner, the potting glue 18 is poured into the area between the capacitor core 1 and the wire outlet 17, so that the capacitor core 1 is packaged inside the shell 16, and the process manufacturing of the welding-free film capacitor is completed.

[0070] K lead terminals 2 are welded on each welding layer 12, K≥1 and K is a positive integer, and the embodiment takes K=1 as an example. Two lead terminals 2 pass through the potting glue 18 and the wire outlet 17 and are led out from the wire outlet side of the shell 16. The two lead terminals 2 are electrically connected to different positions of the circuit on the circuit board to connect the welding-free film capacitor to the circuit on the circuit board.

[0071] The solderless film capacitor of the embodiment further comprises a shell 16, the capacitor core 1 is arranged in the shell 16, a top of the shell 16 is provided with a wire outlet 17, the capacitor core 1 and the wire outlet 17 are filled with potting glue 18, a plurality of the lead-out terminals 2 pass through the potting glue 18 and the wire outlet 17 and extend out from the same side of the shell 16.

[0072] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the application unless otherwise specifically stated. In all examples shown and discussed herein, any specific value should be interpreted as merely an example and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like numbers and letters refer to like items throughout the several views of the drawings, and therefore, once an item is defined in one view, it is not necessary to discuss it further in subsequent views.

[0073] It will be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device is inverted in the figures, a device described as on other device or construction is above or on other device or construction would then be oriented below or under the other device or construction. Accordingly, the exemplary term "above" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0074] In addition, it should be noted that the use of "first", "second", and the like words of similar meaning in connection with describing components does not imply a special order or significance but is used for convenience only and should not be construed as limiting the application.

[0075] The above only is the preferred embodiment of the present application, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A solderless thin film capacitor, characterized by, The capacitor core is in a cylindrical structure, and the end faces on both sides of the capacitor core are connected with lead terminals which extend away from the capacitor core; the end of the lead terminal away from the capacitor core is a plug-in end which is in a ring structure; a first opening is formed in the middle of the plug-in end to provide a deformation allowance when the plug-in end is stressed, and a plurality of points are distributed along the inner wall of the first opening, and a support member is connected between the plurality of points; all the points are arranged along the extension direction of the inner wall of the first opening to form a convex pattern; The support member is in a bracket type structure which forms an angle with the inner wall of the first opening; The end faces on both sides of the capacitor core are provided with a welding layer, and the lead terminal is welded on the welding layer; The end of the lead terminal welded with the welding layer is a connecting end which is in a ring structure, and a second opening is formed in the middle of the connecting end; The lead terminal further includes an extension part which is located between the plug-in end and the connecting end; the two ends of the extension part are respectively connected with the plug-in end and the connecting end, or the extension part, the plug-in end and the connecting end are integrally formed.

2. The solderless film capacitor of claim 1, wherein, The first opening includes a ring-shaped side wall and a first horizontal part, and the first horizontal part is located on the side of the first opening away from the capacitor core, and the first horizontal part is connected with the ring-shaped side wall.

3. The solderless film capacitor of claim 2, wherein, The first opening further includes a second horizontal part, and the second horizontal part is located on the side of the first opening close to the capacitor core.

4. The solderless film capacitor of claim 2, wherein, The support member includes a first reinforcing rib and a second reinforcing rib, and the two opposite ring-shaped side walls are respectively connected with the first end of the first reinforcing rib and the first end of the second reinforcing rib, and the second end of the first reinforcing rib and the second end of the second reinforcing rib are both connected to the first horizontal part.

5. The solderless film capacitor of claim 4, wherein, The angle between the first reinforcing rib and the second reinforcing rib is 12°-60°.

6. The solderless film capacitor of claim 3, wherein, A transition surface is arranged between the second horizontal part and the ring-shaped side wall, and the two sides of the transition surface are respectively connected with the second horizontal part and the ring-shaped side wall.

7. The solderless film capacitor of claim 1, wherein, Further including an outer shell, the capacitor core is arranged in the outer shell, and a wire outlet is formed in the top of the outer shell; the capacitor core and the wire outlet are filled with potting glue, a plurality of lead terminals pass through the potting glue and the wire outlet, and extend out from the same side of the outer shell.

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