JP2018206846A - Electronic component - Google Patents

Abstract

To provide an electronic component having vibration resistance, durability and resistance to short circuit.SOLUTION: An electronic component comprises a capacitor element 2, an external case, and a sealing body. When wound together with a separator while covering a lead tab 8 on an electrode of one of an anode foil 5 and a cathode foil 6, the capacitor element 2 has a length from at least one lead tab 8 to the other lead tab 8, and has a pair of protective sheets 9A, 9B arranged such that respective semi-circular arcuate recessed surfaces are opposite each other when the capacitor element 2 is viewed from the direction of a winding shaft. The protective sheets 9A, 9B are narrower than the width of the separator 7 and formed so as to be accommodated in the separator. The outer peripheral surface of the external case has, on an inner peripheral surface of the external case located on the rear surface of a first recessed part, a first protruding part formed in a tapering shape, which protrudes toward the center in a radial direction, due to formation of a plurality of first tapering recessed parts radially shallowing toward the opening from the bottom face of a bottomed cylindrical shape.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electronic component used in an electric device and a vehicle.

  In recent years, the environment in which electronic components are used not only in vehicles but also in electrical equipment has been diversified. For this reason, environmental resistance is also strongly required for electronic components used in electrical equipment. Specifically, an electronic component having high mechanical strength and excellent vibration resistance is required. However, cylindrical electronic components such as electrolytic capacitors, electric double layer capacitors, and lithium ion capacitors tend to be vulnerable to vibration because they are held upright on a circuit board and the electrode terminals are fixed with solder or the like.

  Therefore, in order to satisfy the request, the following forms are implemented. For example, after winding the tape around the outer periphery of the capacitor element in multiple layers and storing it in a metal case with a small gap with the case, press the two places on the outer periphery of the metal case with curling means to form a recess. Then, the entire circumference of the capacitor element is in contact with and supported by a convex portion protruding on the back side of the concave portion (see Patent Document 1).

  In addition, in the connection part connecting the lead terminal to each of the anode foil and the cathode foil constituting the capacitor element, a cut burr generated when the connection part is formed (hereinafter referred to as “burr” as appropriate) breaks through the separator. Causes a short circuit. Then, the structure which coat | covers a connection part with an insulating material for a short circuit prevention is proposed and implemented (refer patent document 2).

JP 2008-109074 A JP 2012-169575 A

  However, in the case described in Patent Document 1, the entire circumference of the element is pressed and fixed by a plurality of annular protrusions formed on the inner peripheral surface, but the vibration on the bottom side of the case where the vibration width of the element is the largest In order to suppress this, it is necessary to increase the pressing force. Therefore, if the element shape varies, an excessive pressing force tends to act on a portion having a large outer dimension. In addition, when a capacitor element provided with an insulating material covering the connecting portion as in Patent Document 2 is used, the thickness of the connecting portion in the plate thickness direction is thicker than other portions, and the size of the outer dimensions of the capacitor element is large. Variation occurs. Therefore, an excessive pressing force is likely to act on the portion having a large outer dimension, which may damage the capacitor element.

  Further, in Patent Document 2, after manufacturing the capacitor element, in order to make it possible to visually recognize whether or not the position of the insulating material is appropriate, the insulating material protrudes from both electrode foils and both ends of the separator. . Therefore, when the lead terminal is inserted into the sealing body and stored in the exterior case, a gap is generated by the insulating material sandwiched between the sealing body and the capacitor element, so that the holding state of the capacitor element in the exterior case becomes unstable. Become.

  The present invention has been made in view of the above problems, and an object thereof is to provide an electronic component having vibration resistance, durability, and short-circuit resistance.

  The present invention provides the following electronic components.

That is, the electronic component according to the embodiment of the present invention has the following configuration.
An element in which an anode foil and a cathode foil connected to one end of a lead tab are overlapped and wound via a separator,
A cylindrical outer case with a bottom that houses the element;
A sealing body for sealing the opening of the outer case, and an electronic component comprising:
The element has a length from at least one lead tab to the other lead tab when wound together with the separator while covering a lead tab on one electrode of the anode foil and the cathode foil, Including a pair of protective sheets arranged with the semicircular arc-shaped recessed surfaces facing each other when viewed from the winding axis direction,
The protective sheet is narrower than the separator and is formed to fit within the separator.
The outer peripheral surface of the outer case is formed with a plurality of tapered first concave portions whose depth in the radial direction decreases from the bottom surface of the bottomed cylindrical shape toward the opening. It has the 1st protruding part formed in the taper shape which protrudes toward the radial direction center in the inner peripheral surface of the exterior case located in the back surface of this.

  According to this configuration, since the pair of protective sheets covering the lead tabs have the semicircular arc-shaped recessed surfaces facing each other, when viewed from the winding axis direction of the element (the cross section of the element was visually observed) When), it is almost circular. Therefore, since the thickness of the protective sheet contributes substantially uniformly in the radial direction of the element, the element can be brought close to a perfect circle. The substantially rounded element is given a substantially uniform pressure from the first raised portion. Therefore, even when the connecting portion has a burr, it is possible to avoid the burr from penetrating the protective sheet due to an excessive pressing force acting on the protective sheet.

  Furthermore, since the protective sheet is contained in the separator, the protective sheet protruding from the separator is caught between the element end face on the lead tab side and the sealing body as in the case of assembling the conventional electronic component, so that there is a gap. It is never formed. Therefore, according to this configuration, the element is stably held in the outer case.

  Further, even when the element has a part having a large external dimension, the part is guided so as to enter between the adjacent first ridges apart from the first ridges in contact. Be guided. That is, it is possible to avoid an excessive pressing force acting on the element due to contact with the first raised portion.

  As described above, the vibration resistance, durability, and short-circuit resistance of the electronic component can be improved by the configuration of the protective sheet and the first recess.

An annular second ridge formed on the inner circumferential surface located on the back surface of the second recess by the annular second recess formed along the outer circumferential surface,
It is preferable that the element is abutted and supported by the first raised portion and the second raised portion.

  According to this configuration, when the diameter of the element is small, the first raised portion tends to have a lower holding force because the contact area in the circumferential direction is small. However, the annular second raised portion causes the circle of the element to be reduced. The entire circumference can be contacted and supported. Therefore, the holding power of the element can be increased.

  In addition, in the said structure, you may form a 2nd recessed part and a 2nd protruding part in an exterior case as follows, for example.

  The second recessed portion and the second raised portion are formed between a tip of the first recessed portion and the first raised portion facing the opening of the exterior case and the sealing body.

  According to this configuration, since the second recessed portion and the second raised portion are formed between the first raised portion and the sealing body, the interval at which the element is not held in the outer case is shortened. Therefore, since the element can be stably held by the first raised portion and the second raised portion, the vibration resistance of the electronic component can be improved.

  The second recessed portion and the second raised portion are in contact with or intersect with the first recessed portion and the first raised portion.

  According to this configuration, the portion where the first raised portion and the second raised portion cross each other holds the element in a two-dimensional manner, so that the holding force increases, and consequently the vibration resistance of the electronic component can be improved. it can.

The second recessed portion and the second raised portion are composed of a plurality of pieces,
The plurality of second recesses and second ridges between the first recess and the first ridges toward the opening of the exterior case and the sealing body, the first recesses and the first ridges It forms so that it may touch or cross.

  According to this configuration, since the element is abutted and supported by the plurality of second raised portions, the vibration resistance is further improved.

  In addition, the above configuration may be configured as follows.

  For example, the bottom surface of the exterior case is formed by extending from the outer peripheral end of the bottom surface toward the center of the bottom surface, and by forming a third recess recessed in the axial direction of the exterior case. A third raised portion that rises toward the opening is formed on the back surface of the bottom surface located on the back surface of the third recess.

  According to this configuration, the insertion tip of the element comes into contact with the third raised portion formed on the back side of the bottom surface of the exterior case, so that the element is more stably contacted and supported by the inner peripheral surface and the back surface of the exterior case. can do. As a result, the vibration resistance is further improved as compared with the case where only the outer periphery of the element is supported by a raised portion.

  Further, in the above configuration, the element is wound in a state in which the cathode foil and the separator are protruded in the axial direction of the outer case from the anode foil, and the third raised portion is the cathode foil and the separator. It is preferable that it contacts.

  According to this configuration, since the cathode foil and the separator protruding from the anode foil to the bottom surface side are in contact with the raised portion on the bottom surface side of the outer case, the outer case can function as a heat sink via the raised portion. . Therefore, an electronic component having an excellent heat dissipation effect can be configured.

In addition, the present invention provides an element in which an anode foil and a cathode foil connected to one end of a lead tab are overlapped and wound via a separator,
A cylindrical outer case with a bottom that houses the element;
A sealing body for sealing the opening of the outer case, and an electronic component comprising:
The element has a length from at least one lead tab to the other lead tab when wound together with the separator while covering a lead tab on one electrode of the anode foil and the cathode foil, When viewed from the winding axis direction, it comprises a pair of protective sheets arranged with the semicircular arc-shaped recessed surfaces facing each other,
The protective sheet is narrower than the separator and is formed to fit within the separator.
The outer case has a plurality of second recessed portions formed along the outer peripheral surface, and has an annular second raised portion that protrudes toward the center in the radial direction on the inner peripheral surface located on the back surface of the second recessed portion,
The element is configured to abut and support the element by the second raised portion.

  According to this configuration, since the element is abutted and supported by the plurality of second raised portions, the vibration resistance is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic component which has vibration resistance, durability, and short circuit resistance can be provided.

It is sectional drawing which shows the structure of an electrolytic capacitor. It is a perspective view of the capacitor | condenser element used with an electrolytic capacitor. It is a cross-sectional schematic diagram which shows the position of a lead tab and a protection sheet in the XX arrow view of FIG. It is a longitudinal cross-sectional view of FIG. It is an expanded view of the capacitor | condenser element which fractured | ruptured the protective sheet partially. It is a perspective view of the exterior case used with an electrolytic capacitor. It is a perspective view of the exterior case used for the electrolytic capacitor of a modification. It is a perspective view of the exterior case used for the electrolytic capacitor of a modification. It is a fragmentary sectional view of the electrolytic capacitor shown in the modification of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, an aluminum electrolytic capacitor (hereinafter referred to as “electrolytic capacitor” as appropriate) will be described as an example of the electronic component.

<Electrolytic capacitor>
As shown in FIG. 1, the electrolytic capacitor 1 of this embodiment includes a capacitor element 2, an elastic sealing material 3, and an outer case 4. The capacitor element 2 corresponds to the element of the present invention, and the elastic sealing material 3 corresponds to the sealing body of the present invention.

  As shown in FIG. 2, the capacitor element 2 is formed by winding an anode foil 5 and a cathode foil 6 via a separator (electrolytic paper) 7. As shown in FIGS. 3 and 4, a protective sheet 9 is attached so as to cover the lead tabs 8 connected to the anode foil 5 and the cathode foil 6. In addition, the separator 7 is wound around the outer periphery of the capacitor element 2, and the outer periphery is fixed by winding an element stop tape (not shown).

  Flat lead tabs 8 are connected to the anode foil 5 and the cathode foil 6, and lead portions 10 are drawn from the anode foil 5 and the cathode foil 6 through the lead tabs 8, respectively. The two lead portions 10 are led out from one end face of the capacitor element 2. Each lead portion 10 is composed of a round bar-like connecting portion 10A connected to the tip of the lead tab 8, and a lead wire 10B welded to the tip of the connecting portion 10A.

  The anode foil 5 is made of a valve metal such as aluminum, tantalum, or niobium. The surface of the anode foil 5 is roughened by an etching process, and an anodized film (not shown) is formed by anodization (chemical conversion).

  The cathode foil 6 is also made of aluminum or the like, like the anode foil 5, and its surface is roughened and a natural oxide film (not shown) is formed. The cathode foil 6 may be a foil having an anodized film, a foil having titanium, titanium nitride or the like deposited on its surface, or a foil carrying carbon, titanium or the like.

  The separator 7 holds a driving electrolyte. As a result, the driving electrolyte is held between the anode foil 5 and the separator 7, and the driving electrolyte is also held between the cathode foil 6 and the separator 7. The driving electrolyte is held by impregnating the capacitor element 2 in the driving electrolyte.

  The protective sheet 9 has a length that covers from one lead tab 8 to the other lead tab 8 when wound in a state of being fixed to the separator located on the back surface of the electrode to which the one lead tab 8 is connected, When the capacitor element 2 is viewed from the winding axis direction, the capacitor element 2 is composed of a pair of insulating sheets whose semicircular arc-shaped recessed surfaces face each other. That is, as shown in FIG. 3, one protective sheet 9A covers the lead tab 8 (+) on the surface side of the anode foil, and covers the lead tab 8 (−) with the separator 7 sandwiched on the back side of the cathode foil. It is wound to do. The other protective sheet 9B is wound so as to cover the lead tab 8 (-) on the surface side of the cathode foil and to cover the lead tab 8 (+) with the separator 7 sandwiched on the back side of the anode foil. That is, in the cross section taken along the line XX of the capacitor element 2 shown in FIG. 3, each of the protective sheets 9A and 9B has a semicircular arc shape, and has a substantially circular shape with the recessed surfaces facing each other.

  Further, as shown in FIGS. 4 and 5, the protective sheet 9 has a width smaller than the width of the separator 7, and the protective sheet 9 is disposed so as to be accommodated in the separator 7. In FIG. 5, the protective sheet 9 is illustrated by partially cutting the periphery of the lead tab 8, but the lead tab 8 is actually covered with the protective sheet 9. The protective sheet 9 is an insulating material and is fixed to the separator 7 by an adhesive or pressure bonding. When an adhesive is used, an adhesive that does not affect the characteristics of the capacitor is selected. For example, phenol type, epoxy type, cyanoacrylate type, polyimide type, acrylic type, silicone type, rubber type, hot melt type and the like can be mentioned.

  As shown in FIG. 1, the capacitor | condenser element 2 is accommodated in the exterior case 4 formed in the bottomed cylindrical shape.

  The outer case 4 is made of aluminum or the like. Although the exterior case 4 is illustrated in FIG. 6, the bottom surface is directed upward for convenience of explanation. The outer case 4 has a tapered first concave portion 11 whose depth becomes shallower from the bottomed cylindrical bottom surface 4A toward the opening obliquely downward, at a predetermined interval on the outer peripheral surface 4B (equal intervals in this embodiment). A plurality of them are formed. Moreover, the 1st recessed part 11 is a concave curve shape. Further, as shown in FIG. 1, the inner peripheral surface located on the back surface of the first recess 11 has a tapered shape that is inclined obliquely downward from the bottom surface 4A to the opening and has a raised height toward the radial center. The first raised portion 12 is formed. Therefore, a plurality of first raised portions 12 are also formed at a predetermined interval similarly to the first recessed portion 11. The top of the first raised portion 12 faces the center of the outer case 4. At this time, the width of the first recess 11 on the circumference of the bottom surface of the outer case 4 is set to be, for example, [circumference of outer case / number of recesses] × N%. Note that N is appropriately set in the range of 1 to 30% according to the outer dimensions such as the size of the outer case 4. Further, the number of the first recesses 11 is preferably 3 or more, and if it is 6 or more, the vibration resistance is improved no matter where the lead portion 10 of the capacitor element 2 is located with respect to the first recess 11. Can do.

  Further, the outer case 4 is formed with an annular second concave portion 14 extending in the circumferential direction of the outer peripheral surface 4 </ b> B between the opening end of the first concave portion 11 and the elastic sealing material 3. A second raised portion 15 is formed on the inner peripheral surface of the exterior case 4 located on the back surface of the second recess 14 with the top portion facing the center of the exterior case 4.

  These first raised portion 12 and second raised portion 15 abut and support the capacitor element 2 as shown in FIG.

  Further, the depth D of the first concave portion 11 and the second concave portion 14 causes the capacitor element 2 to bite part of the contact portion of the first raised portion 12 within a range in which the capacitor element 2 is not damaged or disconnected. Is set. For example, when the outer case 4 has a diameter of 18 mm and a length of 40 mm, the first raised portion 12 is set to bite into the capacitor element 2. The depth D at which the first raised portion 12 bites into the capacitor element 2 is desirably 10% or less of the diameter of the capacitor element 2 so as not to apply stress to the capacitor element 2. In addition, the depth D of the 1st recessed part 11 and the 2nd recessed part 14 may differ.

  The first raised portion 12 is a length of the first raised portion 12 from the insertion distal end side of the outer peripheral surface of the capacitor element 2 toward the proximal end on the lead portion side in the process of housing the capacitor element 2 from the opening side of the outer case 4. The capacitor element 2 is abutted and supported while gradually increasing the contact area in the width direction and the width direction. In other words, the first raised portion 12 abuts and supports the capacitor element 2 while elastically deforming the capacitor element 2 to a slight extent.

  Further, the first raised portion 12 functions as follows in the process of storing the capacitor element 2. When the capacitor element 2 has a portion having a large external dimension such as a diameter or a shape, the pressing force acting on the portion by contact with the first raised portion 12 becomes larger than the pressing force acting on other portions. Therefore, when a portion having a large outer dimension of the capacitor element 2 is in contact with the chamfer of the top portion of the first raised portion 12, the portion is raised by the restoring force (repulsive force) accompanying the elastic deformation of the capacitor element 2. Guided and guided between the adjacent first raised portions 12 while sliding the portion 12.

  As shown in FIG. 1, the opening of the outer case 4 is sealed with the elastic sealing material 3 in a state where the two lead portions 10 are pulled out. The elastic sealing material 3 is disposed in a compressed state by a winding fastening portion 16 formed in the opening of the exterior case 4. Note that a valve (not shown) is provided at the bottom of the exterior case 4 so that when the internal pressure rises, the valve opens to release the internal pressure to the outside.

  The elastic sealing material 3 is formed with two through holes 17 through which the two lead portions 10 respectively penetrate. The inner diameter of the through hole 17 in a no-load state where no force is applied to the elastic sealing material 3 is slightly smaller than the outer diameter of the connecting portion 10A.

  The elastic sealing material 3 is formed of a composition based on rubber or thermoplastic elastomer. Specifically, EPT (ethylene propylene terpolymer), EPDM (ethylene propylene diene monomer copolymer), IIR (isoprene isobutylene rubber) and the like are used as the rubber constituting the elastic sealing material 3.

  As described above, according to the configuration of the electrolytic capacitor 1 according to the present embodiment, the tapered first concave portion 11 whose depth becomes shallower from the bottomed cylindrical bottom surface 4A toward the opening perpendicular to the outer peripheral surface. By forming a plurality on 4B, the capacitor element 2 is supported in the vertical direction and the width direction by the first raised portion 12 having the same shape as the first recess 11 formed on the back surface side of the outer peripheral surface. Further, the capacitor element 2 is supported by the entire circumference by the second raised portion 15. Therefore, since the support location and area of the capacitor element 2 are increased, the vibration resistance of the electrolytic capacitor 1 can be increased, and the strength of the exterior case itself can be increased by the first recess 11 and the second recess 14.

  In particular, the capacitor element 2 is in a non-holding state between the tip of the first raised portion 12 and the elastic sealing material 3. However, by forming the second raised portion 15 between the leading end of the first raised portion 12 and the elastic sealing material 3, the distance that the capacitor element 2 is not held in the exterior case is shortened, so that the impact is received. The vibration of the capacitor element 2 is reduced. Therefore, it is possible to suppress damage due to the bending of the capacitor element 2 due to vibration, and to improve the vibration resistance of the electrolytic capacitor 1.

  In addition, when there is a part having a large external dimension in the capacitor element 2, the part is guided and guided so as to enter between the first raised parts that are separated from the first raised part 12. Therefore, according to the electrolytic capacitor 1 of the present embodiment, it is possible to avoid an excessive pressing force from acting on the capacitor element 2 due to the contact between the capacitor element 2 and the first raised portion 12. Can be prevented from being damaged.

  Furthermore, since the outer peripheral surface from the insertion distal end side of the capacitor element 2 toward the lead portion side proximal end is in contact with the top of the first raised portion 12 with a predetermined length and a predetermined area, the pressing force to the capacitor element 2 is reduced. It is possible to prevent the capacitor element 2 from being damaged by being dispersed.

  The present invention will be described more specifically with reference to the following examples.

Assuming three types of capacitor element structures for electrolytic capacitors, the flatness of each capacitor element was measured by simulation. Comparative product 1 is a type that does not have a protective sheet. Comparative product 2 is a type in which the lead tab is sandwiched between short protective sheets covering one lead tab. The example product has the element structure of the above embodiment. A protective sheet having a density of 0.750 g / cm ³ and a tensile strength of 63.1 N / mm was used. The characteristics of the electrolytic capacitor are a rated voltage of 400 V, a capacitance of 90 μF, a diameter of 18 mm, and a height of 31.5 mm.

  In the simulation, when the free end of the capacitor element before fixing is gripped with the winding tape and pulled with 1N, the two lead tabs are horizontally aligned with the horizontal diameter a and the diameter as shown in FIG. Measure the diameter b perpendicular to a. The flatness was obtained by substituting the measurement result into flatness = 1−b / a × 100. The stress value acting on the lead tab at this time was also obtained.

  As is apparent from Table 1 as a result of the simulation, the example product has a significantly improved flatness compared to the comparative products 1 and 2, and approximates a perfect circle. Further, the stress value of the example product is improved by about 18% for the comparative product 1 and by about 15% for the comparative product 2.

  Therefore, each of the pair of protective sheets covering the lead tabs has a semicircular arc shape when viewed from the winding axis direction of the capacitor element, and the recessed surfaces face each other. Therefore, the thickness of the protective sheet is in the radial direction of the capacitor element. It contributes uniformly, and the capacitor element can be brought close to a perfect circle. Furthermore, the substantially rounded capacitor element is given substantially uniform pressure from the first and second raised portions. Therefore, even if the lead tab has a cut burr, an excessive pressing force does not act on the protective sheet, so that the cut burr can be prevented from penetrating the protective sheet.

  Furthermore, since the protective sheet is contained in the separator, the protective sheet protruding from the separator is not caught between the capacitor element end face on the lead tab side and the elastic sealing material, so that no gap is formed. Therefore, the electrolytic capacitor of the product of the above example can stably hold the capacitor element in the outer case.

  In addition, this invention is not limited to the structure of the electrolytic capacitor 1 of the said embodiment, You may comprise as follows.

  (1) In the electrolytic capacitor 1 of the above-described embodiment, the second concave portion 14 and the second raised portion 15 are formed between the distal end of the first concave portion 11 on the insertion side and the elastic sealing material 3. However, it may be configured as follows.

  For example, the first recess 11 is formed so as to intersect the second recess 14. That is, the annular second concave portion 14 is formed in contact with the opening-side tip of the first concave portion 11. Alternatively, the annular second recess 14 intersects the first recess 11. According to this configuration, the first raised portion 12 and the second raised portion 15 formed on the inner peripheral surfaces of the first concave portion 11 and the second concave portion 14 extend along the central axis (winding axis) of the capacitor element 2. Since the capacitor element 2 is abutted and supported two-dimensionally from the vertical direction and the horizontal direction along the circumference of the capacitor element 2, the holding force of the capacitor element 2 increases. Therefore, the vibration resistance of the electrolytic capacitor 1 can be improved.

  As another embodiment, a plurality of second concave portions 14 and second raised portions 15 may be formed in the outer case 4. For example, an annular second recess 14 is formed on the tip of the first recess 11 and the second recess 14 is formed between the tip of the first recess 11 and the elastic sealing material 3. That is, the pitch of the capacitor element 2 in contact with and supported by the two second raised portions 15 formed by the two second recesses 14 becomes narrow, so that the deflection due to the vibration of the capacitor element itself when subjected to an impact. Is suppressed, and as a result, damage to the capacitor element 2 can be suppressed.

  (2) Although the 1st recessed part 11 formed in the exterior case 4 of the said embodiment was formed so that it might go diagonally toward the opening of the exterior case 4, it is not limited to the said form, It forms as follows. May be.

  As shown in FIG. 7, the first recess 11 may have a curved shape such that the tip of the first recess 11 wraps around the lower side of the adjacent first recess 11.

  (3) Although the 1st recessed part 11 formed in the exterior case 4 of said each embodiment was a concave curve shape, it is a rectangle seeing from the bottom face of the exterior case 4, and it tapers toward the opening from the bottom face 4A. It may be tapered.

  (4) As shown in FIG. 8, the exterior case 4 has a first recess 11A that tapers from the outer periphery of the bottom surface 4A toward the opening, and has the same shape as the first recess 11A and is connected to the first recess 11A. The structure provided with the 3rd recessed part 11B which becomes a taper shape toward the center from the outer periphery of bottom face 4A in the aspect may be sufficient. That is, the tapered first concave portion 11A whose radial depth becomes shallower from the bottomed cylindrical bottom surface 4A toward the opening, and the first concave portion 11A on the outer peripheral side of the bottom surface 4A are connected to the center of the bottom surface 4A. The third concave portion 11B is formed in a tapered shape with a depth that becomes shallower. A first raised portion 12A and a third raised portion 12B are formed on the back side of the first recessed portion 11A and the third recessed portion 11B.

  When the electrolytic capacitor 1 is produced using the outer case 4, the capacitor element 2 is preferably configured as follows.

  As shown in FIG. 9, for example, the tips of the cathode foil 6 and the separator 7 protrude from the anode foil 5 and come into contact with the third raised portion 12 </ b> B formed on the back surface of the bottom surface 4 </ b> A of the exterior case 4. In this configuration, the width of the cathode foil 6 (the length in the axial direction) may be longer than the width of the anode foil 5, or when the width of the cathode foil 6 is the same as that of the anode foil 5, What is necessary is just to comprise so that the cathode foil 6 may be shifted to the bottom face side of the exterior case 4 with respect to the foil 5. FIG. The capacitor element 2 is formed by winding the anode foil 5, the cathode foil 6 and the separator 7. Needless to say, the separator 7 has such a width that the anode foil 5 and the cathode foil 6 do not contact each other.

  According to this configuration, since the tip end side of the capacitor element 2 and the outer case 4 are in contact with each other, not only the vibration resistance of the electrolytic capacitor 1 can be improved, but also the cathode foil 6 and the outer case 4 are in contact with each other. Therefore, the outer case 4 functions as a heat sink. Therefore, the electrolytic capacitor 1 excellent in heat dissipation can be configured. Note that a part of the third raised portion 12 </ b> B formed on the bottom surface of the outer case 4 may be configured to be parallel to the upper portion of the capacitor element 2.

  Alternatively, the first recess 11 may not be provided, and only the plurality of second recesses 14 and the second raised portions 15 may be formed in the exterior case 4. That is, the capacitor element 2 is abutted and supported by the plurality of second raised portions 15 formed by the plurality of second recesses 14, so that bending due to vibration of the capacitor element itself when subjected to an impact is suppressed. As a result, damage to the capacitor element 2 can be suppressed.

  (5) In the above embodiment, the electrolytic capacitor has been described as an example. However, the present invention is not limited to the electrolytic capacitor. For example, in an electronic component that seals an element with a cylindrical outer case such as an electric double layer capacitor or a lithium ion capacitor, Needless to say, the outer case 4 described in each of the above embodiments can be applied.

DESCRIPTION OF SYMBOLS 1 Electrolytic capacitor 2 Capacitor element 3 Elastic sealing material 4 Exterior case 5 Anode foil 6 Cathode foil 7 Separator 8 Lead tab 9, 9A, 9B Protection sheet 10 Lead part 10A Connection part 10B Lead wire 11, 11A, 11B 1st recessed part 12, 12A , 12B First raised portion 14 Second recessed portion 15 Second raised portion 16 Winding portion

Claims (8)

An element in which an anode foil and a cathode foil connected to one end of a lead tab are overlapped and wound via a separator,
A cylindrical outer case with a bottom that houses the element;
A sealing body for sealing the opening of the outer case, and an electronic component comprising:
The element has a length from at least one lead tab to the other lead tab when wound together with the separator while covering a lead tab on one electrode of the anode foil and the cathode foil, When viewed from the winding axis direction, it comprises a pair of protective sheets arranged with the semicircular arc-shaped recessed surfaces facing each other,
The protective sheet is narrower than the separator and is formed to fit within the separator.
The outer peripheral surface of the outer case is formed with a plurality of tapered first concave portions whose depth in the radial direction decreases from the bottom surface of the bottomed cylindrical shape toward the opening. An electronic component comprising: a first raised portion formed in a tapered shape protruding toward the radial center on an inner peripheral surface of an outer case located on the back surface of the outer case. An annular second ridge formed on the inner circumferential surface located on the back surface of the second recess by the annular second recess formed along the outer circumferential surface,
The electronic component according to claim 1, wherein the element is configured to contact and support the first raised portion and the second raised portion. The said 2nd recessed part and the said 2nd protruding part are formed between the front-end | tip toward the opening of the exterior case of the said 1st recessed part and the said 1st protruding part, and the said sealing body. Or the electronic component of Claim 2. The electronic component according to claim 3, wherein the second concave portion and the second raised portion are in contact with or intersect with the first concave portion and the first raised portion. The second recessed portion and the second raised portion are composed of a plurality of pieces,
The plurality of second recesses and second ridges between the first recess and the first ridges toward the opening of the exterior case and the sealing body, the first recesses and the first ridges The electronic component according to claim 3, wherein the electronic component is formed so as to be in contact with or intersecting with each other. The bottom surface of the exterior case is formed by extending from the outer peripheral end of the bottom surface toward the center of the bottom surface, and the third recess is formed by being recessed in the axial direction of the exterior case. The electronic component according to any one of claims 3 to 5, wherein a third raised portion that is raised toward the opening is formed on the back surface of the bottom surface located on the back surface of the recess. The element is wound in a state in which the cathode foil and the separator protrude in the axial direction of the outer case from the anode foil, and the third raised portion is in contact with the cathode foil and the separator. The electronic component according to claim 6. An element in which an anode foil and a cathode foil connected to one end of a lead tab are overlapped and wound via a separator,
A cylindrical outer case with a bottom that houses the element;
A sealing body for sealing the opening of the outer case, and an electronic component comprising:
The element has a length from at least one lead tab to the other lead tab when wound together with the separator while covering a lead tab on one electrode of the anode foil and the cathode foil, When viewed from the winding axis direction, it comprises a pair of protective sheets arranged with the semicircular arc-shaped recessed surfaces facing each other,
The protective sheet is narrower than the separator and is formed to fit within the separator.
The outer case has a plurality of second recessed portions formed along the outer peripheral surface, and has an annular second raised portion that protrudes toward the center in the radial direction on the inner peripheral surface located on the back surface of the second recessed portion,
An electronic component configured to abut and support the element by the second raised portion.