TW202011433A - Lead wire terminal and method for producing same - Google Patents

Abstract

A lead wire terminal (4) used for an electrolytic capacitor (1), wherein the lead wire terminal (4) is characterized in being provided with: a tab terminal (41), having a plate-shaped rolled part (41b) to be connected by caulking to an electrode foil (60) of an electrolytic capacitor (1); and a lead wire (42) connected to the tab terminal (41), the rolled part (41b) being provided with positioning holes (41c) for positioning the tip of a perforation needle (201) for producing a caulking connection with the electrode foil (60).

Description

Lead terminal and its manufacturing method

The present invention relates to a lead terminal used for an electrolytic capacitor and a method of manufacturing the same.

As is well known, lead terminals for electrolytic capacitors include: a connection sheet terminal having a plate-shaped rolled portion connected to the electrode foil; and a lead wire connected to the connection sheet terminal.

As a method of connecting the rolled portion of the connection tab terminal to the electrode foil, a method is known in which an electrode foil is superposed on one side of the rolled portion, and in this state, a perforated needle is inserted through the rolled portion and the electrode foil from the other side of the rolled portion, Burrs formed on one side of the rolled portion are crushed, and the rolled portion is riveted to the electrode foil.

Existing technical literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 7-106203

In the above caulking method, it is necessary to accurately position the tip of the piercing needle at a predetermined position on the other surface of the rolled portion. If the tip of the piercing needle deviates from the predetermined position, it may be difficult to obtain desired capacitor characteristics.

The present invention has been made in view of the above-mentioned problems, and an object of the invention is to accurately position the tip of a perforated needle for crimping a rolled portion of a lead terminal to an electrode foil of an electrolytic capacitor with respect to the rolled portion.

In order to achieve the above object, the first invention is a lead terminal (4) for an electrolytic capacitor (1), which is characterized by comprising: a tab terminal (41) having an electrode foil (60) riveted to the electrolytic capacitor (1) ) A plate-shaped rolled portion (41b); a lead (42), which is connected to the tab terminal (41), and a positioning hole (41c) is provided on at least one surface of the rolled portion (41b), which is used for riveting the electrode The tip of the perforated needle (201) of the foil (60) is positioned.

In addition, the second invention is a method of manufacturing a lead terminal according to the first invention, which includes a rolled portion forming step of punching a part of a metal rod of a predetermined length into a flat plate shape and cutting its outer periphery in the thickness direction to form The calendering portion 41b; and the perforating step, a positioning hole (41c) is perforated in the calendering portion (41b).

According to the present invention, the tip of the perforated needle for caulking the rolled portion of the lead terminal to the electrode foil of the electrolytic capacitor can be accurately positioned relative to the rolled portion.

1‧‧‧Electrolytic capacitor

2‧‧‧Housing

3‧‧‧Capacitor element

4‧‧‧Lead terminal

5‧‧‧sealing body

41a‧‧‧Bar

41b‧‧‧Rolling Department

41b1, 41b2

41c (41c1, 41c2) ‧‧‧ positioning hole

41d‧‧‧Glitch

41e‧‧‧Punch burr

42‧‧‧Lead

60‧‧‧electrode foil

201‧‧‧Pierced needle

300‧‧‧ stamping die

301‧‧‧protrusion

500‧‧‧Clamping parts

501‧‧‧protrusion

600‧‧‧Metal rod

FIG. 1 is a cross-sectional view of an electrolytic capacitor mounted with a lead terminal according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the lead terminal of FIG. 1.

Fig. 3 is a cross-sectional view of a main part of a die for punching a metal rod.

4A is an explanatory diagram of the step of swaging the rolled portion of the lead terminal to the electrode foil (Part 1).

4B is an explanatory diagram of the step of swaging the rolled portion of the lead terminal to the electrode foil (Part 2).

4C is an explanatory diagram of the step of crimping the rolled portion of the lead terminal to the electrode foil (Part 3).

4D is an explanatory diagram of the step of swaging the rolled portion of the lead terminal to the electrode foil (Part 4).

FIG. 5 is an explanatory diagram of a burr removing step.

6 is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

7A is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

7B is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

8 is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

9 is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

10 is a cross-sectional view of a main part of a rolled portion of a lead terminal according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the electrolytic capacitor mounted with the lead terminal of this embodiment will be described.

As shown in FIG. 1, the electrolytic capacitor 1 includes a bottomed cylindrical case 2, a capacitor element 3, a pair of lead terminals 4, and a sealing body 5 that closes the opening of the case 2. In the capacitor element 3, an electrode foil (described later) is wound into a cylindrical shape. The capacitor element 3 is housed inside the case 2. The pair of lead terminals 4 protrudes from one end surface of the cylindrical capacitor element 3, and a part of them is located outside the case 2 via the sealing body 5.

As shown in FIG. 2, the lead terminal 4 includes a tab terminal 41 made of a metal bar such as aluminum, and a lead 42 connected to one end thereof. The metal rod is chemically treated with a chemical solution containing boric acid or adipic acid in advance, and the outer surface is covered with an oxidation protective film. The tab terminal 41 is formed by pressing and cutting a part of the metal rod of a predetermined length in the axial direction in the radial direction, and has a rod-shaped portion 41a at one end and a rolled portion 41b at the other end.

The rod-shaped portion 41a is a portion of the above-mentioned metal rod that has not been subjected to press working and cutting. A lead 42 is connected to one end of the rod-shaped portion 41a by welding or the like. The axis of the lead 42 is coaxial with the axis of the rod portion 41a. The lead 42 is formed of, for example, a CP wire provided with a copper layer on the outer peripheral surface of the iron wire. The rolled portion 41b is formed by punching a part of the metal rod into a flat plate shape and cutting the outer periphery in the thickness direction. When the lead terminal 4 is viewed from the thickness direction of the rolled portion 41b, the rod-shaped portion 41a extends from the center position in the width direction of the rolled portion 41b. Therefore, when the lead terminal 4 is viewed from the same direction, the lead 42 also extends from the center position in the width direction of the rolled portion 41b via the rod-shaped portion 41a. In addition, the positional relationship between the stamping die for stamping (detailed in FIG. 3) and the cutting machine for cutting is uniquely determined in advance.

A part of the metal rod is press-processed so that the center position in the thickness direction of the rolled portion 41b is located on a plane passing through the axis of the rod-shaped portion 41a. Therefore, the center position in the thickness direction of the rolled portion 41b is located on a plane passing through the axis of the rod portion 41a. In other words, the lead 42 extends from the center position in the thickness direction of the rolled portion 41b via the rod-shaped portion 41a.

The rolling portion 41b is formed with a plurality of positioning holes 41c. These positioning holes 41c can be formed at the same time when the rolled portion 41b is formed by press working. That is, when forming the rolled portion 41b, as shown in FIG. 3, a part of the metal rod 600 of a predetermined length in the axial direction is pressed between the stamping die 300 and the bracket 400 to be pressed into a flat plate shape. The mold 300 is provided with a protrusion that perforates the positioning hole 41c in advance, and the rolled portion 41b and the positioning hole 41c can be formed at the same time. In this way, the rolled portion forming step of forming the rolled portion 41b also serves as a perforating step of perforating the positioning hole 41c, so that the positioning hole 41c can be formed without increasing the number of steps.

The positioning holes 41c are located at the central portion in the width direction of the rolled portion 41b on one surface 41b1 of the rolled portion 41b, and are formed at predetermined intervals in the axial direction of the lead terminal 4. As shown in FIGS. 4A and 4B, the positioning hole 41 c has a truncated cone shape, and is formed into a shape that fits the conical tip of the perforated needle 201 that crimps the rolled portion 41 b to the electrode foil 60, and penetrates the rolled portion 41 b in the thickness direction . In other words, the positioning hole 41c has a shape that is reduced in diameter (tapered) from one surface 41b1 to the other surface 41b2 of the rolled portion 41b. In addition, the positioning hole is not limited to a truncated cone shape as long as it can be fitted into the tip of the piercing needle 201, and may be, for example, a cone shape.

Since the tip of the punching needle 201 is fitted into the positioning hole 41c, the punching needle 201 is accurately positioned with respect to the rolling portion 41b, so the punching needle 201 does not deviate from the rolling portion 41b. In addition, since the positioning hole 41c is formed at the same time when the rolled portion 41b is formed by press working and cutting, it does not deviate from the rolled portion 41b.

In addition, as shown in FIGS. 4A and 4B, the positioning hole 41 c may be configured to penetrate the rolled portion 41 b or may not be configured to penetrate the rolled portion 41 b (described later). When the positioning hole 41c penetrates the rolled portion 41b, compared with the non-penetrating structure, the stress acting on the piercing needle 201 during piercing becomes smaller, and the abrasion or breakage of the piercing needle 201 is less likely to occur.

The electrolytic capacitor 1 is manufactured according to the following procedure. First, the electrode foil on the anode side, the electrode foil on the cathode side, and the separator are cut to a certain width and length. The electrode foil is made of aluminum, and a dielectric layer of an alumina protective film is formed on the surface of the electrode foil on the anode side. Then, the rolled portion 41b of the anode lead terminal 4 is crimped to the anode-side electrode foil, and the rolled portion 41b of the cathode lead terminal 4 is crimped to the cathode-side electrode foil.

In this case, first, as shown in FIG. 4A, the lower mold 100 supports one surface of the electrode foil 60, and the other surface 41 b 2 of the rolled portion 41 b of the lead terminal 4 is superposed on the other surface of the electrode foil 60.

Then, as shown in FIG. 4B, the upper mold 200 disposed above the rolled portion 41 b is lowered, and the rolled portion 41 b and the electrode foil 60 are sandwiched between the upper mold 200 and the lower mold 100. At this time, the relative position of the upper die 200 and the positioning hole 41c is adjusted so that the tip of the riveting punch 201 equipped with the upper die 200 coincides with the central axis of the positioning hole 41c in a plan view. In addition, "plan view" indicates the direction in which the rolled portion 41b is viewed from the thickness direction of the rolled portion 41b.

Then, as shown in FIG. 4C, the piercing needle 201 for riveting provided on the upper mold 200 is lowered, and its tip is inserted into the positioning hole 41 c of the calender 41 b to lower the piercing needle 201 to the top of the piercing needle 201 to pierce the electrode foil 60, thereby forming a burr 41d on the rolled portion 41b. In more detail, the portion of the rolled portion 41b located on the outer periphery of the positioning hole 41c is pushed out in the insertion direction due to the insertion of the perforated needle 201, and finally protrudes to the back surface of one side of the electrode foil 60. This protruding portion corresponds to the aforementioned burr 41d.

Then, as shown in FIG. 4D, after raising the perforated needle 201, the burr 41 d is pushed up and crushed by the ejector pin 101 provided in the lower mold 100, thereby fixing the rolled portion 41 b to the electrode foil 60.

In this way, the separator is interposed between the electrode foil 60 on the anode side and the electrode foil 60 on the cathode side to which the lead terminal 4 is connected, and the pair of electrode foils 60 and the separator are wound into a roll shape and formed into a substantially cylindrical shape. The insulating tape fixes the top end of the electrode foil 60 to form the capacitor element 3. A pair of lead terminals 4 protrudes from one end surface of the cylindrical capacitor element 3 formed in this way.

Then, the pair of lead terminals 4 protruding from the capacitor element 3 are inserted into the pair of through holes 51 provided in the sealing body 5 (refer to FIG. 1 ), and the sealing body 5 is mounted on the capacitor element 3. Then, the capacitor element 3 is inserted into the case 2 and the capacitor element 3 is immersed in the electrolytic solution, and the sealing body 5 attached to the capacitor element 3 is arranged on the opening side of the case 2.

Then, the vicinity of the opening of the housing 2 is wound from the outer peripheral side surface and tightened to seal the opening of the housing 2. Furthermore, a cylindrical shrink film (not shown) in which the product name, manufacturer name, etc. are written is inserted into the outer periphery of the case 2, and the shrink film is thermally shrunk to complete the electrolytic capacitor 1.

The specific embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments.

For example, the position, shape, number, etc. of the positioning holes 41c are not limited to this embodiment.

In addition, the positioning hole 41c may be formed in the rolled portion 41b in a step different from the rolled portion forming step. That is, the rolled portion 41b is formed by punching a part of the metal rod 600 (see FIG. 3) into a flat shape in the rolled portion forming step and cutting the outer periphery in the thickness direction by a cutter, but the outer periphery of the flat portion When cutting in only one direction in the thickness direction, as shown in FIG. 5, a punching burr 41 e protruding from the peripheral edge of the one surface 41 b 1 of the rolled portion 41 b in one direction in the thickness direction (in other words, the cutting direction of the cutter) is formed. Therefore, depending on the required quality of the lead terminal 4, a burr removing step for removing the punching burr 41e may be additionally provided. In such a case, the burr removing step may also serve as a punching step for punching the positioning hole 41c.

That is, in the burr removal step, as shown in FIG. 5, the pressing burr 41e is crushed by sandwiching the rolled portion 41b in the thickness direction with the two clamping members 500, 500. The protrusion 501 which perforates the positioning hole 41c is provided so that the pressing burrs 41e of the rolled portion 41b can be crushed by the pinching members 500 and 500, and the positioning hole 41c can be formed in the rolled portion 41b. In addition, the protrusion 501 perforating the positioning hole 41c may be provided on both of the clamping member members 500, 500. The position where the rolled portion 41b is arranged with respect to the pinching members 500, 500 is uniquely determined. Therefore, the positioning hole 41c is not misaligned with the rolling portion 41b.

In addition, the positioning holes 41c may be formed only on one surface 41b1 of the rolled portion 41b, or may be formed on both surfaces 41b1 and 41b2 of the rolled portion 41b.

When the positioning hole 41c is formed only on one surface 41b1 of the rolled portion 41b, the positioning hole 41c may be a through hole (see FIGS. 4A and 4B ), or may be a non-through hole as shown in FIG. 6.

The positioning hole 41c shown in FIG. 6 is formed by processing from only one surface 41b1 of the rolled portion 41b so that the positioning hole 41c does not penetrate the rolled portion 41b. The burr formed when the perforated needle 201 for riveting (see FIGS. 4A to 4D) penetrates the rolled portion 41b by changing the distance d1 between the tip of the positioning hole 41c and the other surface (the surface in contact with the electrode foil) 41b2 of the rolled portion 41b The size of 41d changes. Therefore, by adjusting the distance d1, the burr 41d can have a desired size.

On the other hand, when the positioning holes 41c are formed on both surfaces 41b1, 41b2 of the rolled portion 41b, the positioning holes 41c1 formed on the surface 41b1 and the positioning holes 41c2 formed on the surface 41b2 may be connected as shown in FIG. 7A ( In other words, it may be a through hole), or it may be separated as shown in FIG. 7B (in other words, it may be formed separately).

As shown in FIGS. 7A and 7B, the positioning hole 41c1 and the positioning hole 41c2 face each other in the thickness direction of the rolled portion 41b. That is, the positioning hole 41c1 and the positioning hole 41c2 are provided at the same position when viewed from the thickness direction (in plan view of the rolled portion 41b). In more detail, the positioning hole 41c1 and the positioning hole 41c2 have the same shape and size, and their central axes are coaxial.

First, the effects common to the configurations shown in FIGS. 7A and 7B will be described. As described above, the lead terminal 4 is configured such that the lead 42 extends from the center position in the thickness direction of the rolled portion 41b via the rod-shaped portion 41a. Therefore, as shown in FIGS. 7A and 7B, if positioning holes 41c1 and 41c2 facing each other in the thickness direction are formed on both surfaces 41b1 and 41b2 of the rolled portion 41b, no matter which surface of the rolled portion 41b is connected to the electrode When the foil 60 overlaps, both of the rolled portions 41b can be caulked to the electrode foil 60.

Here, in the configuration in which the positioning hole 41c is formed only on one surface 41b1 of the rolled portion 41b, the other surface 41b2 of the rolled portion 41b needs to overlap with the electrode foil 60, so a step of identifying the surface 41b1 and the surface 41b2 of the rolled portion 41b is required . However, according to the configuration shown in FIGS. 7A and 7B, since either of the surfaces of the rolled portion 41b can be overlapped with the electrode foil 60, there is no need to identify the surface 41b1 and the surface 41b2 of the rolled portion 41b, thereby improving productivity . However, in this case, if the pressing burr 41 e (see FIG. 5) remains on the peripheral edge of any one surface of the rolled portion 41 b, there is a possibility that the electrode foil 60 or the separator may be damaged by the pressing burr 41 e. For example, when the electrode foil 60 overlaps the surface where the punching burr 41e remains, the electrode foil 60 may be damaged by the punching burr 41e. Therefore, in order to allow the rolled portion 41b to be properly caulked to the electrode foil 60 regardless of which surface of the rolled portion 41b overlaps the electrode foil 60, it is important that the pressing burr 41e is not formed.

That is, the rolled portion 41b is formed by punching a part of the metal rod 600 (see FIG. 3) into a flat plate shape in the rolled portion forming step and cutting the outer periphery in the thickness direction. However, in this step, the rolled portion 41b is formed in the thickness direction. Cutting the outer periphery of the flat plate-shaped portion in each direction can suppress the formation of punching burrs 41e on the peripheral edges of both surfaces 41b1, 41b2 of the rolled portion 41b. For example, as in the connection terminal manufacturing apparatus disclosed in Japanese Patent Laid-Open No. 2003-347174, a pair of upper and lower cutting edges are used, first, the upper cutting edge is lowered, and the flat-shaped portion is cut to approximately half the thickness, and then , The lower cutting edge having a width slightly wider than the upper cutting edge is raised, and the flat-shaped portion is cut to the remaining half of the thickness, whereby the cross-sectional shape of the rolled portion 41b becomes as shown in FIG. The peripheral edges of both surfaces 41b1, 41b2 of the rolled portion 41b no longer have punching burrs 41e protruding in the thickness direction, and damage to the electrode foil 60 or the separator can be suppressed.

In addition, as shown in FIG. 9, using the method for manufacturing a tab terminal disclosed in Japanese Patent Laid-Open No. 2006-147703, even if the four corners of the rolled portion 41b are chamfered or rounded in the rolling portion forming step In this case, since there is no pressing burr 41e, damage to the electrode foil 60 or the separator can be suppressed.

In addition, the pressing burr 41e may not be protruded from the peripheral edges of both surfaces 41b1 and 41b2 of the rolled portion 41b by a method other than the above.

In addition, the relative positional relationship between the positioning hole 41c1 and the positioning hole 41c2 is not limited to the configuration shown in FIGS. 7A and 7B. For example, the positioning hole 41c1 and the positioning hole 41c2 may be a positional relationship where at least a part of them overlap when viewed in the thickness direction of the rolled portion 41b.

Next, the effect of the configuration shown in FIG. 7B will be described. As shown in FIG. 7B, when the tip of the positioning hole 41c1 is separated from the tip of the positioning hole 41c2 (in other words, when the positioning hole 41c1 and the positioning hole 41c2 are separately formed), by changing the two positioning holes 41c1, 41c2 The distance d2 between the distal ends of the tip changes the size of the burr 41d formed when the perforated needle 201 (see FIGS. 4A to 4D) for caulking passes through the rolled portion 41b. Therefore, by adjusting the distance d2, the burr 41d can have a desired size.

In the above example, in the configuration in which the positioning holes 41c are formed on both sides of the rolled portion 41b, the rolled portion 41b is formed so as not to cause punching burrs 41e, and when the rolled portion 41b is riveted to the electrode foil 60, even if rolling is not recognized Since the surface 41b1 and the surface 41b2 of the portion 41b can also form the capacitor element 3 without damaging the electrode foil 60 and the separator, the productivity is improved.

In the configuration in which positioning holes 41c are formed on both surfaces of the rolled portion 41b, in addition to the above-described example, the following configuration may be adopted. That is, as shown in FIG. 10, a press burr 41e may remain on the peripheral edge of any one surface of the rolled portion 41b (the surface 41b1 in FIG. 10). Furthermore, by intentionally making the positioning hole 41c1 and the positioning hole 41c2 different in size from each other, the surface 41b1 and the surface 41b2 can be identified. In the example of FIG. 10, the positioning hole 41c1 and the positioning hole 41c2 have a conical shape similar to each other, and the size of the positioning hole 41c2 is larger than the size of the positioning hole 41c1.

The above configuration is useful in the following cases. That is, when crimping the rolled portion 41b to the electrode foil 60, the electrode foil 60 may be damaged by the punching burr 41e. In order to avoid such a situation, it is preferable to overlap the electrode foil 60 with the surface (the surface 41b2 in FIG. 10) where the punching burr 41e is not generated. According to the above configuration, the surface 41b1 and the surface 41b2 can be appropriately identified based on the difference in the size of the positioning hole 41c1 and the positioning hole 41c2, so that the possibility that the surface where the punching burr 41e is generated will erroneously overlap with the electrode foil 60 can be greatly reduced. The damage of the electrode foil 60 can be suppressed.

Alternatively, there may be no particular problem even if the punching burr contacts the electrode foil 60 41e. In addition, there may be a problem when the punching burr 41e comes into contact with the diaphragm. As described above, the capacitor element 3 is formed by sandwiching the separator between the electrode foil 60 connected to the lead terminal 4 on the anode side and the electrode foil 60 connected to the lead terminal 4 on the cathode side, and winding them into a roll shape. . Therefore, one side of the rolled portion 41b of the one lead terminal 4 is in contact with the electrode foil 60, and the other side is in contact with the separator. Therefore, in this case, it is preferable to intentionally overlap the surface on which the punching burr 41e is formed (the surface 41b1 in FIG. 10) with the electrode foil 60, so that the surface on which the punching burr 41e is not formed (in FIG. In 10, the surface 41b2) is in contact with the diaphragm. According to the above configuration, the surface 41b1 and the surface 41b2 can be appropriately recognized based on the difference in the size of the positioning hole 41c1 and the positioning hole 41c2, so that the possibility that the surface where the punching burr 41e is generated is erroneously contacted with the diaphragm can be greatly reduced, and it is possible to Inhibit membrane damage.

That is, it is possible to determine in advance which surface of the rolled portion 41b is connected to the electrode foil 60, and recognize the surface 41b1 and the surface 41b2 of the rolled portion 41b based on the positioning holes 41c1 and 41c2 so that the desired surface overlaps the electrode foil 60 The lead terminal 4 is arranged on the electrode foil 60.

In addition, it may be so configured that the shapes of the positioning hole 41c1 and the positioning hole 41c2 are intentionally different from each other, so that the surface 41b1 and the surface 41b2 can be recognized. For example, the positioning hole 41c1 may be conical and the positioning hole 41c2 may be truncated. Alternatively, the configuration may be such that the shapes and sizes of the positioning holes 41c1 and 41c2 are intentionally different from each other, so that the surfaces 41b1 and 41b2 can be recognized.

In addition, the configuration in which the surfaces 41b1 and 41b2 of the rolled portion 41b can be recognized from the positioning holes 41c1 and 41c2 is not limited to this. For example, when at least a portion of the positioning hole 41c1 does not overlap with the positioning hole 41c2 when the rolled portion 41b is viewed from the thickness direction, or the number of positioning holes 41c formed on one surface of the rolled portion 41b and the rolled portion 41b are formed When the number of positioning holes 41c on the other surface is different, the surfaces 41b1 and 41b2 of the rolled portion 41b can also be recognized from the positioning holes 41c1 and 41c2. In addition, when at least a part of the positioning hole 41c1 does not overlap the positioning hole 41c2 when the rolled portion 41b is viewed from the thickness direction, when the surface 41b1 overlaps the electrode foil 60 and when the surface 41b2 overlaps the electrode foil 60 The position where the rolled portion 41b is caulked to the electrode foil 60 will be different. That is, by selecting the surface where the rolled portion 41b overlaps the electrode foil 60, any one of two types of caulking positions can be arbitrarily selected.

In addition, various changes can be made to the above-described embodiment without departing from the gist of the present invention.

1‧‧‧Electrolytic capacitor

2‧‧‧Housing

3‧‧‧Capacitor element

4‧‧‧Lead terminal

5‧‧‧sealing body

41a‧‧‧Bar

42‧‧‧Lead

51‧‧‧Through hole

Claims (8)

A lead terminal (4) for an electrolytic capacitor (1), the lead terminal being characterized by comprising: a tab terminal (41) having an electrode foil (60) riveted to the electrolytic capacitor (1) A plate-shaped rolling portion (41b); and a lead (42) connected to the connection piece terminal (41), the rolling portion (41b) is provided with a positioning hole (41c) on at least one surface, the positioning hole Position the tip of the perforated needle (201) for riveting the electrode foil (60). The lead terminal according to claim 1, wherein the positioning hole (41c) penetrates the rolled portion (41b). The lead terminal according to claim 1, wherein the positioning holes (41c) are formed on both sides of the rolled portion (41b). The lead terminal according to claim 3, wherein the center position in the thickness direction of the rolled portion (41b) is located on a plane passing through the axis of the lead (42), and is formed on the rolled portion ( The positioning hole (41c1) on the one surface (41b1) of the 41b) and the positioning hole (41c2) formed on the other surface (41b2) of the rolling portion (41b) are in the rolling portion (41b) ) Are opposed in the thickness direction. The lead terminal according to claim 4, wherein the rolling part (41b) is formed by punching a part of the metal rod (600) into a flat plate shape, and cutting the outer periphery of the metal bar from only one direction in the thickness direction. The positioning holes (41c1, 41c2) are provided so that one side (41b1) and the other side (41b2) of the rolling portion (41b) can be recognized based on the positioning holes (41c1, 41c2). A method for manufacturing a lead terminal, the lead terminal being the lead terminal according to claim 1, characterized in that the method for manufacturing the lead terminal includes the steps of forming a rolled portion and forming a metal rod (600) of a predetermined length A part of is pressed into a flat plate shape, and the outer periphery is cut in the thickness direction to form the rolled portion (41b); and a punching step is performed to punch the rolled portion (41b) to form the positioning hole (41c). The method for manufacturing a lead terminal according to claim 6, characterized in that a protrusion (301) for piercing the positioning hole (41c) is provided in the stamping die (300) for performing the stamping process, so that the rolling The part forming process doubles as the perforating process. The method for manufacturing a lead terminal according to claim 6, further comprising a burr removing step, which clamps the rolled portion (41b) between two clamping members (500, 500) so that In the rolling part forming step, a punching burr formed on the periphery of the rolling part (41b) is crushed, and at least one of the clamping members (500, 500) is provided with a protrusion (501) for piercing the positioning hole ), the burr removal step also serves as the perforation step.

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