Surface-mounted aluminum electrolytic capacitor

Abstract

A surface-mounted aluminum electrolytic capacitor comprises a capacitor body and a base, the base comprises a base body and a back plate, and the back plate is arranged on the base body; the seat body and the back plate form an accommodating space of the capacitor body, a lead groove is formed in the bottom of the seat body, the lead groove is in butt joint with a lead through hole in the seat body, and an arc-shaped protruding step is arranged at one end, close to the lead through hole, of the lead groove. According to the surface-mounted aluminum electrolytic capacitor of the utility model, one end, close to the aperture, of each of the two lead grooves of the base plate is provided with an arc-shaped protruding step, so that the stress area at the break angle of the lead is increased, right-angle bending is avoided, and the break angle is in a curved surface shape; therefore, the problems of poor stress resistance, lead tail end height difference and the like in the traditional design are effectively improved; meanwhile, the arc-shaped protruding steps can effectively reduce the tilting of the tail end of the lead after reflow soldering of the surface-mounted electrolytic capacitor.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of aluminum electrolytic capacitors, especially a kind of aluminum electrolytic capacitor of patch type. BACKGROUND

[0002] In electronic equipment, aluminum electrolytic capacitors are widely used in circuits due to their high capacitance values and relatively low cost. Traditional patch-type aluminum electrolytic capacitors usually include a metal lead, which needs to be fixed by a seat plate during installation. However, after the lead is flattened through the seat plate, especially at the corner, there may be a problem of insufficient stress resistance. This poor stress resistance is mainly manifested in stress concentration at the lead corner, which can cause the lead corner to bend or break, affecting the reliability and welding quality of the capacitor.

[0003] To solve this problem, the prior art usually improves the design of the seat plate. For example, some seat plates attempt to optimize the shape of the lead slot during design to reduce stress concentration at the corner, but there is still room for improvement. Therefore, a new seat plate design is needed that can effectively disperse stress at the corner, improve the stress resistance of the lead, and reduce the height difference between the end of the lead and the corner to improve the overall performance and welding quality of the capacitor. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a patch-type aluminum electrolytic capacitor that improves the stress resistance of the lead and prevents the lead from warping.

[0005] To solve the above technical problems, the technical solution proposed by the utility model is as follows: a patch-type aluminum electrolytic capacitor includes a capacitor body and a base, the base includes a seat body and a back plate, the back plate is arranged on the seat body, the seat body and the back plate form a containing space for the capacitor body, a lead slot is arranged on the bottom of the seat body, the lead slot is connected to a lead through hole on the seat body, and an arc-shaped protruding step is arranged at one end of the lead slot near the lead through hole.

[0006] Preferably, the height of the protruding step in the lead slot is one-tenth to one-fifth of the depth of the lead slot.

[0007] Preferably, both ends of the protruding step are provided with arc-shaped connecting parts connected to the lead through hole and the bottom of the lead slot, respectively.

[0008] Preferably, an arc-shaped part that supports the aluminum electrolytic capacitor body is arranged at the junction between the inner side of the back plate and the base; the arc-shaped part is in the shape of an arc-shaped strip.

[0009] Compared with the prior art, the patch type aluminum electrolytic capacitor has the advantages that the patch type aluminum electrolytic capacitor is provided with an arc-shaped protruding step at one end of the seat plate close to the aperture of the lead slot, so that the stress area at the lead bending corner is increased, the right-angle bending is avoided, and the bending corner is in a curved surface type, thereby effectively improving the problems of poor stress resistance, height difference of the lead end and the like in the traditional design; meanwhile, the arc-shaped protruding step can effectively reduce the end lifting of the lead after the reflow soldering of the patch capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structural schematic view of the base in Embodiment 1.

[0011] Figure 2 is a structural schematic view of the base in Embodiment 1.

[0012] Figure 3 is Figure 2 is a sectional structural schematic view of A-A in Embodiment 1.

[0013] Figure 4 is Figure 3 is an enlarged structural schematic view of B in Embodiment 1.

[0014] LEGEND

[0015] 1, seat body; 11, lead through hole; 12, lead slot; 13, protruding step; 131, arc-shaped connecting part; 2, back plate; 21, arc-shaped part. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present application, the present application will be described in more detail and in a more complete and specific manner in the following with reference to the accompanying drawings and preferred embodiments, but the protection scope of the present application is not limited to the following specific embodiments.

[0017] It should be particularly noted that when one element is described as being "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to the other element, or indirectly fixed, fixedly connected, connected or communicated to the other element through other intermediate connecting elements.

[0018] Unless otherwise defined, all the professional terms used in the following have the same meanings as those commonly understood by those skilled in the art. The professional terms used in the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the protection scope of the present application. Embodiment 1

[0019] The patch type aluminum electrolytic capacitor of the present embodiment comprises a cylindrical capacitor body and a base; as shown in Figure 1As shown, the base comprises a seat body 1 and a back plate 2, the back plate 2 is arranged on the seat body 1; the seat body 1 and the back plate 2 form a containing space of the capacitor body. As shown in the figure, Figures 2-4 As shown, a lead slot 12 is arranged on the bottom of the seat body 1, the lead slot 12 is butted with the lead through hole 11 on the seat body 1, and an arc-shaped raised step 13 is arranged on one end of the lead slot 12 close to the lead through hole 11. In this embodiment, the height of the raised step 13 in the lead slot 12 is one tenth to one fifth of the depth of the lead slot 12.

[0020] In this embodiment, in order to prevent the raised step 13 from being arranged with a right angle structure with the lead through hole 11 and the bottom of the lead slot 12, arc-shaped connecting parts 131 are arranged on both ends of the raised step 13 to connect with the lead through hole 11 and the bottom of the lead slot 12 respectively.

[0021] In this embodiment, the arrangement of the arc-shaped raised step 13 can increase the stress area at the lead bending angle, so as to avoid the right angle bending at the bending angle, so that the bending angle presents a curved surface type, and the stress is not too concentrated at the bending angle, and the problem of poor stress resistance is avoided. At the same time, when the lead is arranged in the lead slot 12, the arc-shaped raised step 13 can prevent the lead from being arranged with an inclined angle at the joint part of the lead through hole 11 and the lead slot 12, so as to prevent the lead end from being raised, and the problem of the lead end being raised after the reflow soldering of the patch type aluminum electrolytic capacitor is improved.

[0022] In this embodiment, the stress on the lead is mostly caused by the shaking between the capacitor body and the base due to vibration; as shown in the figure, Figure 1 In this embodiment, in order to reduce the shaking of the capacitor body between the inside of the back plate 2 and the base, an arc-shaped part is arranged at the joint part to support the aluminum electrolytic capacitor body, and the arc-shaped part is in the form of an arc-shaped strip. In this embodiment, the arrangement of the arc-shaped part can make the crimped end of the capacitor body top on the arc-shaped part. In the actual production process, when the crimped end of the capacitor body is top on the arc-shaped part, the crimped end of the capacitor body is not horizontally top on the arc-shaped part, but has a certain angle; thereby effectively reducing the rotation of the capacitor body on the base, and reducing the shaking of the capacitor body on the base during vibration, so as to reduce the stress on the lead.

[0023] The patch type aluminum electrolytic capacitor of this embodiment can increase the stress area at the lead bending angle by arranging an arc-shaped raised step 13 at one end of the lead slot 12 close to the aperture, avoid the right angle bending, and make the bending angle present a curved surface type, thereby effectively improving the problems of poor stress resistance, height difference of the lead end and other problems existing in the traditional design; at the same time, the arc-shaped raised step 13 can effectively reduce the end of the lead of the patch type electrolytic capacitor being raised after the reflow soldering.

Claims

1. A chip aluminum electrolytic capacitor comprising a capacitor body and a base, wherein the base comprises a base and a back plate, and the back plate is disposed on the base; characterized in that: The base and the back plate form a storage space for the capacitor body. A lead groove is provided on the bottom of the base, and the lead groove is connected to the lead through hole on the base. An arc-shaped raised step is provided on one end of the lead groove close to the lead through hole.

2. The chip-type aluminum electrolytic capacitor according to claim 1, characterized in that: The height of the raised step in the wire guide groove is one tenth to one fifth of the depth of the wire guide groove.

3. The chip-type aluminum electrolytic capacitor according to claim 1, wherein: Both ends of the raised step are provided with arc-shaped connecting parts respectively connected to the lead through hole and the bottom of the lead groove.

4. The chip-type aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized in that: The joint between the inner side of the back plate and the base is provided with an arc portion for supporting the aluminum electrolytic capacitor body; the arc portion is in the shape of an arc strip.

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