JP2016046387A - Capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of a capacitor, while enhancing the support strength of a capacitor element, by blocking intensive action of stress on a part of a case, for the caulking, thereby preventing impairment of an electrode foil, and the like.SOLUTION: In a capacitor (2) including a capacitor element (6), a case(outer case 4) in which a housing section (14) for housing the capacitor element is formed, and a sealing body (10) for sealing the case where the capacitor element is housed in the housing section, a caulking section (12) is formed by pressing and deforming a part of the case, and the caulking section includes a plane part (20) for pressing the peripheral surface of the capacitor element in the housing section in the central direction of the case by a plane of a predetermined width, and bends (22) formed on the opposite end sides of the plane part, by being bent between the exterior surface of the case and the plane part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a capacitor having a structure for supporting a capacitor element housed in a case.

  In capacitors such as an electrolytic capacitor and an electric double layer capacitor, a capacitor element is housed in a case. Capacitors are increasingly mounted on automobiles and the like, and intense vibrations continue to act. In a vehicle-mounted capacitor, for example, a case and a capacitor element, or a terminal component connected to the capacitor element may be damaged by vibration. Therefore, there are known capacitors in which a fixing material is sealed inside the case and those in which the case and the capacitor element are integrated and fixed by caulking the side of the case.

  With respect to such a capacitor, there is a capacitor in which a capacitor element and a case are brought into contact and fixed by pressing and crimping a part of a side surface of a metal case (for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 64-026830 JP 2008-109074 A

  By the way, in the caulking process of the capacitor, for example, a caulking sesame as a processing means is brought into contact with the outer side of the outer case, and the outer case is deformed by pressing with a predetermined pressing force along the peripheral surface of the case. In this caulking process, for example, as shown in FIG. 6, a caulking groove 50 having a curved surface is formed in a part of the outer case 4 deformed by pressing, and the apex Po of the pressing surface of the caulking groove 50 is the exterior. The shape protrudes inside the case 4. That is, as an example of the caulking portion of the capacitor, for example, the caulking groove 50 having a shape in which the apex angle of the contact surface with respect to the outer case 4 is an obtuse angle is formed. In addition, the caulking portion may be formed in a shape in which the apex angle of the contact surface is an acute angle, for example.

  In the capacitor, for example, the apex Po of the caulking groove 50 and its peripheral side bite into the storage portion 14 of the outer case 4. In this caulking portion, for example, with respect to the capacitor element 6 supported by caulking, the pressing force F in the direction orthogonal to the side surface from the apex portion Po and the pressing force F in the direction along the curved surface portion that is a contact portion other than the apex Po. Occurs. At this time, the pressing force F at the vertex Po acts on the capacitor element 6 most greatly. Thus, when one point is pressed intensively, the capacitor element 6 may be subjected to an excessive load on a part of the electrode foil or the separator, and the pressed portion may be damaged.

  Further, in the caulking portion where the vertex Po is formed, even if the caulking depth is the same, the degree of concentration of stress varies depending on the contact angle of the vertex Po. In the caulking portion, for example, as the contact vertex becomes an acute angle, the stress acts on the contact vertex. When the stress is concentrated at a specific position, in the capacitor element 6, excessive stress is partially applied to the internal electrode foil or the separator, which may cause breakage or damage of the electrode foil. In addition, since the stress acting on the capacitor is concentrated at a specific position in the capacitor, the support area for the capacitor element 6 may be reduced, and a stable support strength may not be obtained.

Therefore, in view of the above problems, the purpose of the capacitor of the present invention is to prevent the stress from concentrating on a part of the case and to damage the electrode foil, etc. In addition to improving reliability, it is to increase the support strength of the capacitor element.

  In order to achieve the above object, one aspect of a capacitor according to the present invention includes a capacitor element, a case in which a storage part for storing the capacitor element is formed, and the case in which the capacitor element is stored in the storage part. A capacitor having a sealing body to be stopped, wherein a caulking portion formed by pressing and deforming a part of the case is formed, and the caulking portion is disposed around the circumferential surface of the capacitor element in the housing portion. A flat portion that presses with a plane having a predetermined width toward the center of the flat portion, and a bent portion that is formed on both ends of the flat portion and is bent by pressing between the exterior surface of the case and the flat portion. .

  In the capacitor, the flat portion may be displaced parallel to the inner diameter direction of the case when a part of the case is pressed, and press the side surface of the capacitor element with an inner wall surface.

  In the above capacitor, a part of a connection portion between the bent portion and the flat portion may press the capacitor element.

  In the capacitor, the case may be formed of a material having formability and strength against a pressing force caused by caulking.

In the above capacitor, the case may be formed of an aluminum alloy to which manganese (Mn) or magnesium (Mg) is added.

  According to the capacitor of the present invention, any of the following effects can be obtained.

  (1) By making the pressing surface planar, it is possible to prevent damage to the electrode foil and the separator without partially concentrating the pressing force on the inside of the case.

(2) The contact surface by the caulking portion can be made planar to increase the support area for the capacitor element and the sealing body, the support range of the capacitor element is widened, and the vibration resistance against external vibration is enhanced.

It is a figure which shows the example of the capacitor | condenser which concerns on 1st Embodiment. It is a figure which shows the example of an arrangement configuration inside the case of a capacitor | condenser. It is a figure which shows the example of formation of a crimping part. It is a figure which shows the example of a formation state of the crimping part according to the material of an exterior case. It is a figure which shows the modification of a crimping part. It is a figure which shows the prior art example of a crimping part.

[First Embodiment]

  FIG. 1 shows an example of a capacitor according to the first embodiment. The capacitor 2 is an example of the capacitor of the present invention, and the present invention is not limited to such a configuration.

  The capacitor 2 may be any capacitor such as an electrolytic capacitor or an electric double layer capacitor, and a capacitor element 6 is accommodated in the exterior case 4. The outer case 4 is an example of the case of the present invention, and is an outer member of the capacitor 2 having a storage portion 14 (FIG. 2) for storing the capacitor element 6 therein. As shown in FIG. 1, the outer case 4 has a bottomed cylindrical shape, for example, and stores an electrolytic solution (not shown) in addition to the capacitor element 6 in the cylindrical portion.

  The capacitor 2 is provided with a sealing body 10 on the opening 15 side formed on the ceiling side of the outer case 4, and seals the storage portion 14 in a state where the capacitor element 6 is stored. Further, the sealing body 10 exposes one end side of the external terminals 8 </ b> A and 8 </ b> B connected to the capacitor element 6 from the inside of the housing portion 14 to the outside of the exterior case 4. The external terminals 8A and 8B are electrically connected to an electronic circuit having a protruding portion from the outer case 4 formed on a substrate (not shown).

  The capacitor 2 is subjected to a caulking process in which the capacitor element 6 housed in the housing portion 14 and the inner peripheral surface of the outer case 4 are integrated by pressing and deforming a part around the side surface of the outer case 4. Is done. Thereby, there are a plurality of caulking portions 12 on the side surface of the outer case 4. The caulking portion 12A is caulked at a position close to the opening side of the outer case 4, and presses the side surface of the sealing body 10 installed inside the storage portion 14 (FIG. 2) to be integrated with the outer case 4. The outer case 4 and the sealing body 10 are fixed and the outer case 4 is sealed.

  Further, the crimping portions 12B and 12C are set, for example, at the peripheral portion of the exterior case 4 near the sealing body 10 side and the bottom portion, and by crimping the side surface portion of the capacitor element 6 in the storage portion 14, the exterior case 4 and the capacitor element 6 are integrated. The positions of the caulking portions 12B and 12C with respect to the capacitor element 6 may be set according to, for example, the balance of the length and load of the capacitor 2 and the capacitor element 6, or the conditions such as the apparatus or installation environment in which the capacitor 2 is installed. For example, by forming the crimped portions on the upper end side and the lower end side of the capacitor element 6, it is possible to further suppress the vibration in the storage portion 14 of the capacitor element 6. That is, when the location where the capacitor element 6 is supported by the caulking portion is concentrated, the capacitor element 6 vibrates around the caulking portion as a fulcrum, and the stress caused by the vibration is concentrated on the external terminals 8A and 8B. 8B may break. However, by caulking the upper and lower ends of the capacitor element 6, the caulking portion can be separated and vibration in the storage portion 14 of the capacitor element 6 can be suppressed. At this time, the caulking portions 12B and 12C may be formed so as to sandwich the center of gravity of the capacitor 2. By pressing and fixing the capacitor element 6 so as to sandwich the center of gravity, vibration of the capacitor element 6 in the outer case 4 can be further prevented. The supporting strength of the capacitor element 6 inside the outer case 4 is determined by the positions of the crimped portions 12B and 12C. In addition, the crimping portions 12B and 12C are preferably subjected to a crimping process while avoiding the tip portions of the connection portions 24A and 24B of the external terminals 8A and 8B as shown in FIG. This is because the tip portions of the connecting portions 24A and 24B are corners, so that the electrode foil and the separator are easily damaged by caulking.

  In the outer case 4, for example, the capacitor element 6 is inserted from the opening formed on the ceiling side of the storage unit 14 toward the bottom side, and the sealing body 10 is stored on the upper side thereof.

  The sealing body 10 includes a resinous material whose peripheral portion can be elastically deformed at least, and is in close contact with the inner peripheral surface of the exterior case 4 to seal the storage portion 14. A central portion of the sealing body 10 has a through hole 30 that allows the external terminals 8 </ b> A and 8 </ b> B of the capacitor element 6 to pass therethrough, and a large-diameter portion 26 that is part of the external terminals 8 </ b> A and 8 </ b> B with respect to the inner wall of the through hole 30. Are in close contact. As described above, in the storage portion 14, the entry of moisture and foreign matters from the outside is prevented by the sealing body 10, and the airtightness of the capacitor 2 is maintained.

  In addition, in the capacitor 2, a curling process is performed from the opening of the outer case 4 toward the inside of the storage unit 14, and the opening end portion of the outer case 4 bites into the end face side of the sealing body 10. In addition to preventing the sealing body 10 from being detached from the opening 15 by this curling process, the storage portion 14 is sealed to suppress evaporation of the electrolyte in the storage portion 14.

  <About the capacitor element 6>

  The capacitor element 6 has, for example, an anode-side and cathode-side electrode foil 18 wound in a columnar shape with a separator 16 interposed therebetween, and a winding tape 19 is wound around the outer peripheral portion to form a cylindrical shape. The winding tape 19 is, for example, paper or insulating tape, and is at least as wide as the electrode foil 18, covers the periphery of the electrode foil 18, and maintains the wound state. The caulking portions 12B and 12C with respect to the capacitor element 6 may be set within a range where the winding tape 19 is wound. By doing so, the winding tape 19 becomes a buffer material when the capacitor element 6 is pressed by the caulking process, and the influence on the electrode foil 18 and the separator 16 can be reduced. The winding tape 19 is more preferably wound around a plurality of turns. Since there is a winding tape 19 layer on the outer periphery of the capacitor element 6, even if the caulking portions 12 </ b> B and 12 </ b> C press the capacitor element 6, the winding tape 19 layer serves as a buffer material, The influence can be further reduced. The thickness of the 19 layers of the winding tape is preferably 200 to 600 [μm]. If it is less than 200 [μm], the effect of the buffering action from the pressing force by the caulking process is low, and if it exceeds 600 [μm], the exterior case 4 to be accommodated must be enlarged, which hinders downsizing.

  The external terminals 8A and 8B have flat connection portions 24A and 24B on one end side inside the winding portion of the capacitor element 6, and are cold-welded or stitch-connected to the anode-side or cathode-side electrode foil 18, respectively. Connected by ultrasonic welding and so on. The connecting portions 24A and 24B are set to be shorter than the length between both end faces of the capacitor element 6.

  In the caulking process for the capacitor element 6, the caulking portions 12 </ b> B and 12 </ b> C are at positions separated in the height direction in order to support the load due to the load of the capacitor element 6 and vibrations from the outside in a well-balanced manner. Further, since the external terminals 8A and 8B are susceptible to external vibration loads by being connected to a substrate or the like, it is desirable that the external terminals 8A and 8B be supported integrally with the capacitor element 6 and the outer case 4. Accordingly, the caulking portion 12B is in a range overlapping with the connecting portions 24A and 24B.

  <About the shape of the crimp part 12>

  The caulking portion 12 is a flat portion 20 that presses against the peripheral surfaces of the capacitor element 6 and the sealing body 10 with a plane having a predetermined width. The flat portion 20 is, for example, in a direction parallel to or close to the central axis O with respect to the height direction of the storage portion 14 of the outer case 4. As a result, the caulking portion 12 is fixedly supported by being crimped to the side surfaces of the capacitor element 6 and the sealing body 10 in the storage portion 14 with a linear surface.

  Further, the caulking portion 12 has bent portions 22 connected to the exterior surface of the exterior case 4 on both end sides of the flat portion 20. The bent portion 22 is a peripheral portion of the flat portion 20 that is the bottom portion of the caulking groove. The bent portion 22 is a boundary portion between the exterior surface of the exterior case 4 and the flat portion 20 by pressing, and includes a portion that is bent by caulking and a portion that extends according to the caulking depth. The bent portion 22 is, for example, along the shape of the side surface with respect to the pressing surface of the crimping piece that performs the crimping process, and is an example of a connection portion between the exterior surface of the packaging case 4 and the flat portion 20.

  For example, as shown in FIG. 3, the bent portion 22 includes a wall surface portion 28 bent in a direction orthogonal to the exterior surface of the exterior case 4 after the caulking process, and a connection that connects the both ends of the plane portion 20 at a predetermined angle. The unit 29 is provided. That is, the caulking portion 12 has a rectangular shape with a flat portion 20, a bent portion 22, and an open portion formed by caulking grooves that are caulking portions 12 </ b> B and 12 </ b> C on the extension of the exterior surface of the exterior case 4. ing. The formation length of the wall surface portion 28 is determined by the caulking depth L3 indicating the amount of displacement. The connection position and angle of the connecting portion 29 are determined by the bending shape and angle of a crimping piece (not shown). The connecting portion 29 has a curved surface so as not to lower the rigidity of the outer case 4, for example, the connecting portion between the flat portion 20 and the wall surface portion 28 becomes brittle.

  In the caulking portions 12 </ b> B and 12 </ b> C, the inner wall surface of the flat portion 20 is in contact with the circumferential surface of the capacitor element 6 in parallel. That is, the plane portion 20 is in surface contact with the plane of the capacitor element 6 with substantially equal pressing force. The width W <b> 1 of the flat portion 20, i.e., the caulking width, may be set according to the outer diameter of the capacitor element 6 that is caulked and supported, and the size of the entire capacitor 2.

  Further, for example, a part or all of the bent portion of the connecting portion 29 on both ends of the flat portion 20 contacts the capacitor element 6. The amount of contact of the connecting portion 29 with the capacitor element 6 varies depending on the caulking depth L3. The setting of the caulking depth L3 is based on the premise that the caulking depth is surely contacted with the capacitor element 6, but if the caulking depth is too large, the pressing force against the capacitor element 6 becomes excessive, and the capacitor element 6 is Risk of damage. Moreover, when the caulking depth L3 is large, the load with respect to the connection part 29 becomes large. When the capacitor element 6 is pressed by the connecting portion 29, the pressing direction is different from the pressing of the capacitor element 6 by the flat surface portion 20. Therefore, when the caulking depth L3 is large, the force from the capacitor element 6 against caulking is large. There is a possibility of concentrating on the connecting portion 29.

The caulking depth L <b> 3 is set according to the gap between the capacitor element 6 and the storage portion 14. The size of the gap is assumed from the difference between the outer diameter L1 of the capacitor element 6 and the inner diameter L2 of the storage portion 14. That is, the gap L4 on one end side in the storage portion 14 is calculated by the following equation, for example.
L4 = (L2-L1) / 2 (1)
For example, when the thickness of the exterior case 4 is d, the caulking depth L3 has a relationship of the following formula (2) with respect to the gap L4 on one end side in the storage portion 14 as an example.
L4 <L3 ≦ (L4 + d) (2)
That is, the outer casing 4 and the capacitor element 6 cannot be integrated unless the caulking depth L3 is larger than the gap L4. Further, when the caulking depth L3 becomes larger than the gap L4 and the thickness d of the case, a part of the capacitor element 6 is depressed by pressing. However, for the capacitor 2, for example, the caulking depth L3 may be made larger than (L4 + d).

  For example, when the capacitor element 6 is not a perfect circle, an average value with respect to the outer diameter measured in a plurality of directions may be used as the outer diameter L1.

  Here, the element diameter of the capacitor element 6 in the portion where the external terminals 8A and 8B are arranged may be different from the element diameter of the capacitor element 6 in the portion where the external terminals 8A and 8B are not arranged. This is due to the presence or absence of the connecting portions 24A and 24B. Therefore, the caulking portion 12B formed at the position in the height direction where the connection portions 24A and 24B are arranged is shallower than the caulking portion 12C at the position in the height direction where the connection portions 24A and 24B are not arranged. Also good. By doing in this way, even when element diameters differ, the pressing force with respect to the capacitor element 6 can be made constant. That is, the depth of the caulking portion 12B where the connecting portions 24A and 24B are arranged and the portion where the element diameter is large is fixed is matched with the caulking portion 12C where the connecting portions 24A and 24B are not arranged and the portion where the element diameter is small is fixed. In this case, in the crimped portion 12B, the pressing force to the capacitor element 6 increases, and the possibility that the electrode foil 18 and the separator 16 are damaged increases. Further, when the caulking portion 12C is aligned with the caulking portion 12B, the pressing force to the capacitor element 6 cannot be sufficiently obtained in the caulking portion 12C, and the fixability may be insufficient. By changing the depth of the caulking portion 12 according to the element diameter of the capacitor element 6 at the height position where the caulking portion 12 is formed, the capacitor element 6 is fixed with a constant pressing force regardless of the size of the element diameter. I can support it. The depths of the crimped portions 12B and 12C may be obtained by measuring and calculating the element diameter of the capacitor element 6 at the height position where the crimping process is performed.

  <Features and effects of the first embodiment>

  (1) Since the pressing surface for the capacitor element 6 such as the capacitor element 6 and the sealing body 10 is formed in a flat shape, the apex where the pressing force is concentrated on the crimping portion 12 is not formed. Damage can be prevented without excessively pressing the pressed portion.

  (2) Since the planar portion 20 provides a large support area for the capacitor element 6, the capacitor element 6 in the outer case 4 can be firmly supported against vibration applied to the capacitor 2 from the outside, and vibration resistance is improved. .

  (3) By improving the vibration resistance by caulking, the external terminal 8A can be used even when the capacitor element 6 is swayed independently in the outer case 4 with respect to, for example, externally applied vibration. , 8B can be prevented from being deformed or damaged, and the reliability of the capacitor 2 can be improved.

  (4) By improving the vibration resistance of the capacitor element 6 and the sealing body 10, it is possible to prevent a part of the external terminals 8A and 8B connected to an external board or the like from being broken in the outer case 4 due to stress. The reliability of the capacitor 2 can be improved.

  [Second Embodiment]

  FIG. 4 shows an example of a caulking portion corresponding to the material of the exterior case. The deformed state of the case shown in FIG. 4 is an example.

  A metal such as an aluminum alloy is used for the outer case 4 of the capacitor 2. As this aluminum alloy, for example, manganese (Mn), magnesium (Mg) or the like is added, and “A3004 material” having corrosion resistance and strength is used. This “A3004 material” includes, for example, silicon (Si) of 0.3 [%] or less, iron (Fe) of 0.7 [%] or less, copper (Cu) of 0.25 [%] or less, manganese ( Mn) is 1.0 to 1.5 [%], magnesium (Mg) is 0.8 to 1.3 [%], and zinc (Zn) is 0.25 [%] or less. It is a condition. Since the exterior case 4 is partially pressed and deformed by the caulking process, a material having a predetermined strength is used, and a material having high strength and moldability due to the molded shape of the exterior case 4 is used.

  In the caulking portion 12, for example, as shown in FIG. 4A, a part of the outer case 4 is pressed and deformed by the caulking piece 40 with a predetermined force F. At this time, the flat surface portion 20 is pressed substantially evenly by the end surface of the crimping piece 40 and moves in parallel toward the center side of the storage portion 14. Moreover, the wall surface part 28 among the bending parts 22 deform | transforms along the side surface of the crimping piece 40, extending toward the center side of the accommodating part 14, for example. In addition, since the connecting portion 29 receives a large force from the pressing direction and the corners of the crimping piece 40 with respect to the traveling direction of the crimping piece 40, particularly in the portion P in the drawing, the strength is strong and the moldability is further improved. Excellent material is used.

  When a material with low strength and formability is used, the outer case 4 is thin, as shown in FIG. 4B, for example. There is a risk of becoming. For this reason, the metal material forming the outer case 4 of the capacitor 2 is required to have a material such as strength and ductility that does not partially reduce the thickness of the outer case 4 due to deformation.

  The exterior case 4 is not limited to the “A3004 material” as long as it is a material having strength and formability, and other metals may be used.

  According to such a configuration, the outer case 4 is prevented from being deteriorated in strength by using a material having a predetermined strength and high moldability. Further, the fixing strength of the capacitor element 6 can be maintained by the caulking portion 12 by preventing the connecting portion 29 from being greatly thinned.

  Moreover, you may restrain so that the opening part 15 side of the exterior case 4 may be pressed down from upper direction at the time of formation of the crimping grooves 12B and 12C. By doing so, the outer case 4 is moved toward the opening 15 with the capacitor element 6 pressing portion of the caulking groove as a starting point by pressing the outer case 4 toward the capacitor element 6 when the caulking groove is formed. Stretching is prevented, and the thickness of the connecting portion 29 of the outer case 4 is further prevented from being reduced.

  Further, by using the outer case 4 made of a hard material, even when the capacitor 2 is used in a high temperature environment, the crimped portions 12B and 12C are not loosened, and the fixing force can be maintained.

  [Other Embodiments]

  (1) The capacitor 2 is not limited to an electrolytic capacitor and an electric double layer capacitor, but can be applied to various capacitors such as a solid capacitor and other power storage elements.

  (2) In the above embodiment, the caulking portion 12 has a shape in which the flat portion 20 and the bent portion 22 are formed in an orthogonal direction state, but is not limited thereto. For example, as shown in FIG. 5, the caulking portion 12 uses a trapezoidal caulking piece 42, and the outer case 4 is caulked along the caulking piece 42, so that the flat portion 20 and the bent portion 22 are formed. The trapezoid shape which made the space part of the groove part which extended the exterior surface of the exterior case 4 one side may be sufficient. That is, the caulking portion 12 has a larger space area in the caulking groove on the exterior surface side than the flat portion 20.

  By caulking in such a shape, the caulking portion 12 has a bending angle θ of the connecting portion 29 of the bending portion 22 with respect to the flat portion 20 is 90 ° or more, and the load due to deformation during pressing is reduced. The occurrence of crystallization can be suppressed.

  In addition, it is sufficient if the contact surface with respect to the side surface of the capacitor element 6 is provided with a flat portion 20, and the flat portion 20 is a position displaced in a parallel direction with respect to the space portion of the caulking groove along the outer case 4. Also good. In other words, the flat surface portion 20 may be subjected to a caulking process in the upper and lower or left and right oblique directions with respect to the side surface of the outer case 4, for example. In this case, the caulking shape seen from the side surface is a parallelogram. Such a caulking groove makes it difficult for the flat portion 20 of the caulking groove, which is the caulking portion 12, from the periphery of the capacitor 2 to be visually recognized from the outside, and the aesthetic appearance of the capacitor 2 can be maintained.

  (3) In the capacitor 2, the width of the planar portion 20 may be the same for the plurality of crimped portions 12B and 12C, or may be different depending on the type and outer diameter of the capacitor element 6 in the storage portion 14. Also good. The caulking width may be set in accordance with the required support strength for the capacitor element 6.

  (4) The crimped portions 12B and 12C may be located at positions where the end portions of the electrode foil 18 are not pressed. By avoiding the end face portion of the electrode foil 18, it is possible to avoid the burrs that occur on the cut surface when the electrode foil 18 is cut into a predetermined width and crimp the electrode foil 18. By doing in this way, the burr | flash is pressed by the crimping parts 12B and 12C, and the possibility of breaking through the separator and short-circuiting can be avoided.

  (5) In the above embodiment, the width of the winding tape 19 is the same as that of the electrode foil 18, but is not limited thereto. Since the winding tape 19 only needs to be positioned in alignment with the crimping portions 12B and 12C of the capacitor element 6, the width of the winding tape 19 is, for example, equal to or greater than the width of the crimping portions 12B and 12C. You may divide | segment and arrange | position only to the part corresponded to the crimping parts 12B and 12C of the capacitor | condenser element 6. FIG. In this way, it is not necessary to change the width of the winding tape 19 depending on the length of the capacitor element 6, it can be used for the capacitor element 6 of various lengths, and the amount of use of the winding tape 19 can be reduced. The material cost can be reduced.

As described above, the most preferred embodiment of the capacitor of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

The present invention is a capacitor that presses a peripheral surface of an outer case containing a capacitor element therein and crimps a plurality of locations, and the crimping portion is pressed by a plane portion having a predetermined width, thereby This is useful because it is possible to prevent concentration of the pressing force on the parts and to increase the fixed support force by increasing the contact surface.

2 Capacitor 4 Exterior Case 6 Capacitor Element 8A, 8B External Terminal 10 Sealing Body 12, 12A, 12B, 12C Clamping Portion 14 Storage Portion 16 Separator 18 Electrode Foil 19 Winding Tape 20 Planar Portion 22 Bending Portion 24A, 24B Connection Portion 26 Large diameter portion 28 Wall surface portion 29 Connecting portion 30 Through hole 40, 42 Capping piece

Claims (5)

A capacitor comprising a capacitor element, a case in which a storage part for storing the capacitor element is formed, and a sealing body for sealing the case in which the capacitor element is stored in the storage part,
A caulking portion is formed by pressing and deforming a part of the case,
The caulking portion is
A flat surface portion that presses the circumferential surface of the capacitor element in the storage portion with a flat surface of a predetermined width toward the center of the case;
A bent portion formed on both ends of the flat portion, and bent by pressing between the exterior surface of the case and the flat portion;
A capacitor comprising:   2. The capacitor according to claim 1, wherein the planar portion is displaced in parallel with the inner diameter direction of the case when a part of the case is pressed, and presses a side surface of the capacitor element with an inner wall surface.   3. The capacitor according to claim 1, wherein a part of a connection portion between the bent portion and the flat portion presses the capacitor element. 4.   The capacitor according to any one of claims 1 to 3, wherein the case is formed of a material having formability and strength against pressing force caused by caulking. The capacitor according to claim 4, wherein the case is formed of an aluminum alloy to which manganese (Mn) or magnesium (Mg) is added.

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