JP2009049039A - Electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic capacitor for preventing the discharge of internal gas and an electrolyte produced at the end of life and abnormal time without enlarging the enclosure of the electrolytic capacitor so much. <P>SOLUTION: An electrolytic capacitor comprises: a spreading polymer film 2 which is formed stretched in a capacitor case 1, and divides a space in the capacitor case 1 into upper and lower portions; a capacitor element 3 provided in a lower housing portion defined by division by the polymer film 2; and a movable strip 7 and a fixed strip 10 which are provided in an upper housing portion defined by division by the polymer film 2, which are inserted in a lead line 6 of the capacitor element 3, and are always closed. The movable strip 7 is deviated from the fixed strip 10 when the polymer film 2 is expanded to an upper housing portion side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrolytic capacitor, and more particularly to an electrolytic capacitor safety device.

  In the conventional electrolytic capacitor, there is a risk that internal gas is generated due to decomposition of the electrolytic solution at the end of life, reverse voltage, overvoltage, etc., and the internal pressure rises and bursts. Therefore, an explosion-proof valve is provided in the capacitor case and the sealing material to release the internally generated gas to the outside when a predetermined internal pressure is reached, and the explosion-proof valve is activated to prevent explosion of the electrolytic capacitor ( For example, see Patent Document 1).

  However, when the explosion-proof valve is activated, the internal gas and electrolyte discharged can be mistaken for the ignition of components in the electrical product. Therefore, when a safety case is provided around the electrolytic capacitor body and the explosion-proof valve of the electrolytic capacitor is activated In addition, a structure has been proposed in which the internal lead wire is cut to prevent energization of the capacitor element, thereby preventing leakage of internal gas and electrolyte outside the safety case (for example, Patent Document 2). reference).

Japanese Unexamined Patent Publication No. 2000-91166 (second page, FIG. 4) Japanese Utility Model Publication No. 5-72127 (second page, FIG. 1)

  However, in the structure where a safety case is provided on the outer periphery of the electrolytic capacitor body as a structure that prevents the release of internal gas and electrolyte when a malfunction occurs at the end of life or abnormal conditions, the electrolytic capacitor has a double outer structure and the electrolytic capacitor Since a space for moving the main body within the safety case is also required, there is a problem that it is difficult to reduce the size.

  The present invention has been made in order to solve the above-described problems, and is capable of preventing the release of internal gas and electrolytic solution that occurs at the end of life or abnormal conditions without enlarging the outer shape of the electrolytic capacitor. The purpose is to obtain a capacitor.

  The electrolytic capacitor according to the present invention is formed to be stretched in a capacitor case, and is provided in a spreadable polymer film that vertically separates the space in the capacitor case, and a lower storage portion formed by separating the polymer film. A capacitor element, and a normally closed movable piece and a fixed piece, which are provided in an upper storage portion formed by separating the polymer film and inserted into the lead wire of the capacitor element, and the polymer film is provided in the upper storage portion. The movable piece deviates from the fixed piece when expanded to the side.

  According to the present invention, a polymer film is stretched in a capacitor case, and a normally closed movable piece and a fixed piece are added to an upper storage portion formed by separation of the polymer film. It is possible to prevent the release of gas from the capacitor case and the outflow of the electrolyte due to an increase in internal pressure of the capacitor, which eliminates the need for a double structure of the case unlike conventional electrolytic capacitors, and moves the electrolytic capacitor body. There is no need for this, and there is an effect that the size can be reduced as compared with the conventional electrolytic capacitor.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the first embodiment.
In the figure, the capacitor case 1 is formed in, for example, a bottomed cylindrical shape, and the opening side is sealed with a sealing material 4 with the bottom portion as an upper portion. A polymer film 2 having a spreadability is stretched inside the capacitor case 1, and storage portions are formed vertically by the partition of the polymer film 2. The polymer film 2 has elasticity and swells upward (upper storage part side) when gas is generated in the lower storage part or the internal pressure rises. An aluminum foil (not shown) of an anode foil (not shown) and a cathode foil (not shown) are wound around a lower storage portion with a separator (not shown) interposed therebetween, and a predetermined electrolyte (not shown). ) Is stored. The anode foil (not shown) of the capacitor element 3 is connected to an external terminal 5 that penetrates the sealing material 4 and protrudes to the outside, and the cathode foil (not shown) of the capacitor element 3 has an upper storage portion. A lead wire 6 wired up to is connected.

  In the upper storage portion, insulating terminal blocks 11a and 11b arranged opposite to each other, a movable piece 7 having one end fixed to one terminal block 11a, and a fixed attached to the upper surface of the other terminal block 11b The piece 10 is accommodated. The movable piece 7 has elasticity, the lead wire 6 is connected to one end portion thereof, a spacer 12 extending downward is attached to a substantially central portion, and the other end portion is formed to protrude downward. A movable contact 8 is provided. The fixed piece 10 is provided with a fixed contact 9 opposite to the movable contact 8 at one end, and a lead wire 13 is connected to the other end. Normally, the movable piece 7 and the fixed piece 10 are in a connected state with their respective contacts 8 and 9 in contact with each other. The lead wire 13 described above is connected to the other external terminal 14 provided through the sealing material 4.

  In the electrolytic capacitor configured as described above, when electric power is supplied to the external terminals 5 and 14, the external terminal 14 is connected to the lead wire 13, the fixed piece 10, the fixed contact 9, and the movable contact 8 in a normal state. Since it is connected to the cathode foil (not shown) of the capacitor element 3 via the movable piece 7 and the lead wire 6, electric power is supplied to the capacitor element 3 and functions as an electrolytic capacitor.

  When gas is generated in the lower storage part due to some cause at the time of abnormality or at the end of the life or the internal pressure rises due to abnormal heat generation of the capacitor element 3, the polymer film 2 swells upward (illustrated by a dotted line) and pushes up the spacer 12. At this time, the movable piece 7 is also pushed up with the terminal block 11a side as a fulcrum, and the movable contact 8 is separated from the fixed contact 9 (illustrated by a dotted line). By separating the contact between the movable contact 8 and the fixed contact 9, the power supply to the cathode foil (not shown) of the capacitor element 3 is cut off, and generation of internal gas and abnormal heat generation of the capacitor element 3 are suppressed. 1 prevents the release of gas and the outflow of electrolyte.

  As described above, according to the first embodiment, the polymer film 2 is stretched in the capacitor case 1, and the normally closed movable piece 7 and the fixed piece 10 are attached to the upper storage portion formed by the partition of the polymer film 2. By simply adding it, it becomes possible to prevent the release of gas from the capacitor case 1 and the outflow of the electrolyte due to an increase in internal pressure at the end of the life or at the end of the life. For this reason, the case doubles like a conventional electrolytic capacitor. There is no need for structuring, there is no need to move the electrolytic capacitor body, and there is an effect that the size can be reduced as compared with the conventional electrolytic capacitor.

  In the first embodiment, the example in which the movable piece 7 and the fixed piece 10 are provided on the lead wire 6 side connected to the cathode foil of the capacitor element 3 is shown. However, the movable piece 7 and the fixed piece 10 are fixed to the lead wire of the anode foil. A piece 10 may be provided.

Embodiment 2. FIG.
In the first embodiment, when the polymer film 2 swells, the movable piece 7 is pushed up so that the movable contact 8 is separated from the fixed contact 9, but the second embodiment is separated from the fixed contact 9. The movable contact 8 is prevented from coming into contact with the fixed contact 9 again, and will be described below with reference to FIG.
FIG. 2 is an enlarged cross-sectional view of the upper storage portion of the electrolytic capacitor according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.

  In the drawing, the holding member 15 disposed above the fixed piece 10 is made of a plate-like insulating material bent at a right angle, one of which is fixed to the terminal block 11b, and the other movable piece 7 side end face is In addition, an inclined surface with which the distal end portion of the movable piece 7 abuts and a locking surface capable of engaging the distal end portion of the movable piece 7 are formed at the end of the inclined surface. The holding member 15 is elastically deformable in the longitudinal direction of the movable piece 7.

  In the electrolytic capacitor configured as described above, the polymer film 2 swells upward when gas is generated in the lower housing part due to some cause at the time of abnormality or at the end of its life or when the internal pressure rises due to abnormal heat generation of the capacitor element 3. To push up the spacer 12. At this time, the movable piece 7 is also pushed up with the terminal block 11a side as a fulcrum (illustrated by a dotted line), and its tip end slides on the inclined surface against the elasticity of the holding member 15, and the movable contact 8 is fixed. Deviation from 9 (illustrated by dotted line). And when the front-end | tip part of the movable piece 7 exceeds an inclined surface, the holding member 15 moves to an original position, and makes a locking surface enter under the movable piece 7. FIG. Thereby, even if the polymer film 2 contracts, the movable piece 7 is held by the locking surface of the holding member 15, and the movable contact 8 and the fixed contact 9 do not come into contact again.

  As described above, according to the second embodiment, since the pushed-up movable piece 7 is held by the holding member 15 so as not to return to the original position, power supply is repeated to the capacitor element 3 that has become abnormal. As a result, the deterioration of the capacitor element 3 is not accelerated, and the contact between the movable contact 8 and the fixed contact 9 is not repeated again. Therefore, the movable contact 8 and the fixed contact 9 may be welded and cannot be separated. There is an effect that an electrolytic capacitor with higher safety can be obtained.

Embodiment 3 FIG.
The third embodiment is an electrolytic capacitor using, for example, a silver tin oxide alloy having high welding resistance for the movable contact 8 of the movable piece 7 and the fixed contact 9 of the fixed piece 10 shown in the first and second embodiments. The structure of the electrolytic capacitor is the same as that in FIG. 1 and will be described with reference to FIG.
In an electrolytic capacitor using a silver tin oxide alloy for the movable contact 8 and the fixed contact 9, when the pressure in the lower storage portion increases due to an abnormality of the capacitor element 3, as described above, the polymer film 2 swells upward ( The movable piece 7 starts to be pushed up together with the spacer 12. At this time, when the internal pressure gradually increases, the pushing speed of the movable piece 7 due to the expansion of the polymer film 2 becomes slow, and the speed at which the movable contact 8 is separated from the fixed contact 9 becomes slow. In such a case, an unstable contact state with a low contact force between the movable contact 8 and the fixed contact 9 continues and both the contacts 8 and 9 generate heat, and contact welding due to melting of the contacts 8 and 9 occurs. Although the movable contact 8 and the fixed contact 9 may not be separated from each other, by using a silver tin oxide alloy for each of the contacts 8, 9, the movable contact 8 can be reliably separated even when the separation speed of the movable contact 8 is slow.

  As described above, according to the third embodiment, since the silver tin oxide alloy having high welding resistance is used for the movable contact 8 of the movable piece 7 and the fixed contact 9 of the fixed piece 10, the separation speed of the movable contact 8. However, even when the unstable contact state continues slowly, the movable contact 8 can be surely separated from the fixed contact 9, and there is an effect that a more reliable electrolytic capacitor can be obtained.

Embodiment 4 FIG.
In the first embodiment, the separation speed of the movable contact 8 is proportional to the expansion speed of the polymer film 2, but in the fourth embodiment, when the expansion amount of the polymer film 2 becomes a predetermined value or more, it is instantaneous. The movable contact 8 is separated from the fixed contact 9, and will be described below with reference to FIG.
FIG. 3 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the fourth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.

  The electrolytic capacitor according to the fourth embodiment includes a reversal leaf spring 16 having both ends fixed to the terminal blocks 11a and 11b so as to be reversible. The reversal leaf spring 16 is bent downward at the center and is in contact with the upper surface of the polymer film 2. The reversal leaf spring 16 is reversed when the center is pushed upward from both ends by the swelling of the polymer film 2. Push up.

  Thus, in the electrolytic capacitor provided with the reversal leaf spring 16, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 swells upward and pushes up the central portion of the reversal leaf spring 16. When the center portion of the reversing leaf spring 16 becomes higher than the positions of both end portions fixed to the terminal blocks 11a and 11b, the center portion is reversed upward (shown by dotted lines), and the spacer 12 is pushed up. At this time, the movable piece 7 is also pushed up, and the movable contact 8 instantaneously deviates from the fixed contact 9 of the fixed piece 10 (illustrated by a dotted line).

  The reversing leaf spring 16 once warped upward is not reversed downward unless it is pushed down to a position where the central portion is lower than both end portions, so that the central portion of the reversing leaf spring 16 is below the both end portions. If the downward pressing force due to the elastic force of the movable piece 7 is adjusted so that it does not occur, the reversing leaf spring 16 which has once warped upward will not be reversed again. For this reason, even if the pressure in the lower storage portion decreases and the polymer film 2 contracts, the reverse leaf spring 16 remains warped upward, the movable piece 7 remains upward, and the disengaged state of the movable contact 8 is maintained. .

  As described above, according to the fourth embodiment, since the movable piece 7 is operated using the reversing leaf spring 16, the detachment speed of the movable contact 8 can be increased, and the holding member once operated. Therefore, it is possible to stop the re-contact between the movable contact 8 and the fixed contact 9 without providing an electrode, and there is an effect that an electrolytic capacitor with improved reliability and safety can be obtained.

Embodiment 5 FIG.
In the second embodiment, the detachment state between the movable contact 8 and the fixed contact 9 due to the abnormality of the capacitor element 3 is not known from the outside. However, in the fifth embodiment, the detachment state between the contacts 8 and 9 is different. This is understood from the outside, and will be described below with reference to FIG.
FIG. 4 is an enlarged cross-sectional view of the upper storage portion of the electrolytic capacitor according to the fifth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 2 demonstrated in FIG. 2, and description is abbreviate | omitted.

  The electrolytic capacitor according to the fifth embodiment includes a through-hole 18 opened at the top of the capacitor case 1 and a blocking display tag 17 that is fixed to the upper surface of the movable piece 7 and has a protrusion that can protrude from the through-hole 18. ing.

  Thus, in the electrolytic capacitor having the blocking display tag 17, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 swells upward and pushes up the spacer 12. At this time, the movable piece 7 is also pushed up with the terminal block 11a side as a fulcrum, the tip of the movable piece 7 slides upward on the inclined surface against the elasticity of the holding member 15, and the movable contact 8 is separated from the fixed contact 9 ( (Dotted line) And when the front-end | tip part of the movable piece 7 exceeds an inclined surface, the holding member 15 moves to an original position with elasticity, and the downward movement of the movable piece 7 is blocked | prevented by a locking surface. On the other hand, when the movable piece 7 is pushed up, the blocking display tag 17 is also pushed up at the same time, and the tip of the protrusion protrudes from the through hole 18. In this case, since the movable piece 7 is held by the holding member 15, the distal end portion of the blocking display tag 17 is also protruded from the through hole 18.

As described above, according to the fifth embodiment, the interrupting display tag 17 interlocked with the movable piece 7 is provided, and when the movable contact 8 and the fixed contact 9 are separated from each other, the distal end portion of the interrupting display tag 17 protrudes from the through-hole 18. Therefore, the state of separation between the movable contact 8 and the fixed contact 9 can be visually determined from the outside, and it is easy to check the electrolytic capacitor in which trouble occurs during repair, and the electrolytic capacitor with good serviceability Is effective.
A silver tin oxide alloy having high welding resistance may be used for the movable contact 8 of the movable piece 7 and the fixed contact 9 of the fixed piece 10. When this alloy is used, as described above, the movable contact 8 can be surely separated from the fixed contact 9 even if the separation speed of the movable contact 8 is slow and the unstable contact state continues. A more reliable electrolytic capacitor can be obtained.

Embodiment 6 FIG.
In the sixth embodiment, in the electrolytic capacitor provided with the reversal leaf spring 16, the state of separation between the movable contact 8 and the fixed contact 9 due to the abnormality of the capacitor element 3 can be seen from the outside. I will explain.
FIG. 5 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the sixth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 4 demonstrated in FIG. 3, and description is abbreviate | omitted.

  The electrolytic capacitor according to the sixth embodiment is provided with a blocking display tag 17a fixed to the upper part of the spacer 12 attached to the movable piece 7, and a through hole that is provided on the upper part of the capacitor case 1 and projects the tip of the blocking display tag 17a. And a mouth 18.

  Thus, in the electrolytic capacitor having the cutoff display tag 17a, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 expands and the reversing leaf spring 16 is reversed upward (illustrated by a dotted line). The movable contact 8 is separated from the fixed contact 9 (illustrated by a dotted line). At this time, the blocking display tag 17 a fixed to the upper part of the spacer 12 moves upward together with the movable piece 7, and the tip of the display tag 17 a protrudes from the through-hole 18.

  As described in the fourth embodiment, the reversal leaf spring 16 is movable once because it does not reverse downward unless the center portion of the reversal leaf spring 16 is pushed below the positions of both ends once it is reversed upward. The separation state between the contact 8 and the fixed contact 9 is maintained, and the state of the blocking display tag 17a protruding from the through hole 18 is maintained.

  As described above, according to the sixth embodiment, the interruption display tag 17a is provided in conjunction with the reversing leaf spring 16, and when the movable contact 8 and the fixed contact 9 are separated by the reversing operation of the reversal leaf spring 16, the interruption indication tag 17a Since the tip portion protrudes from the through-hole 18 to maintain the state, the dissociated state of the contacts 8 and 9 can be visually discerned from the outside, and it becomes easy to check the electrolytic capacitor in which trouble occurs at the time of repair. There is an effect that a good electrolytic capacitor can be obtained.

Embodiment 7 FIG.
In the sixth embodiment, the contact divergence and shut-off display tag 19 is operated by one reversing leaf spring 16, but in the seventh embodiment, two reversal leaf springs are provided and the contact divergence and operation of the shut-off display tag are performed. Are separately performed, and will be described below with reference to FIG.
FIG. 6 is an enlarged cross-sectional view showing an upper storage portion of the electrolytic capacitor according to the seventh embodiment. FIG. 6 is a cross-sectional view of the movable piece and the reverse leaf spring as seen from the longitudinal direction. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 6 demonstrated in FIG. 5, and description is abbreviate | omitted.

  The electrolytic capacitor according to the seventh embodiment includes a first reversing leaf spring 16a provided below the movable piece 7, and a second reversing leaf spring 16b provided in parallel with the first reversing leaf spring 16a (another one). Two reversing leaf springs), a blocking display tag 17a fixed to the upper surface of the central portion of the second reversing leaf spring 16b, and a penetration provided on the top of the capacitor case 1 with the central axis of the blocking display tag 17a as the center. And a mouth 18. Although not shown in the drawing, the movable contact 8 of the movable piece 7 is in contact with the fixed contact 9 of the fixed piece 10, and the two reversing leaf springs 16a and 16b have terminal blocks 11a and 11b at both ends, respectively. It is fixed to be reversible.

  In the electrolytic capacitor configured as described above, when the pressure in the lower storage portion increases due to abnormality of the capacitor element 3, the polymer film 2 swells (illustrated by a dotted line), and the first reversal leaf spring 16a and the second reversal are shown. The leaf spring 16b is pushed up simultaneously. At this time, the movable piece 7 is pushed up by the reversing operation of the first reversing leaf spring 16 a, and the movable contact 8 is separated from the fixed contact 9. Further, the blocking display tag 17 a is pushed up by the reversal of the second reversing leaf spring 16 b, and the tip portion protrudes from the through-hole 18. If the tip of the blocking display tag 17a protruding from the through hole 18 is accidentally pushed down, only the second reversing leaf spring 16b is pushed down to return to the original state, and the first reversing leaf spring 16a It will not be pushed down. That is, the movable contact 8 and the fixed contact 9 do not come into contact again even if the tip of the interruption display tag 17a is accidentally pushed down.

  As described above, according to the seventh embodiment, the first reversing leaf spring 16a for moving the movable contact 8 and the second reversing leaf spring 16b for moving the blocking display tag 17a are provided separately. Even if the shut-off display tag 17a indicating the disengagement state of the contacts 8 and 9 due to the abnormality is erroneously moved, power is not supplied to the capacitor element 3 again, and an electrolytic capacitor with improved safety can be obtained.

Embodiment 8 FIG.
In the fifth to seventh embodiments, the detachment state of the contacts 8 and 9 due to the abnormality of the capacitor element 3 can be confirmed from the shut-off display tags 17 and 17a. However, in the eighth embodiment, the abnormality of the capacitor element 3 is electrically This will be described in detail with reference to FIG.
FIG. 7 is a sectional view showing the structure of the electrolytic capacitor according to the eighth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.

  In the figure, a movable contact 20 centering on the central axis of the movable contact 8 is provided on the upper surface of the other end of the movable piece 7 whose one end is fixed to the terminal block 11a. One end of the second fixed piece 22 (another fixed piece) disposed above the movable piece 7 is fixed to the terminal block 11b, and a fixed contact 21 facing the movable contact 20 is provided on the lower surface of the other end. Is provided. The fixing piece 22 is connected to an abnormality detection terminal 24 fixed to the sealing material 4 via a lead wire 23.

  In the electrolytic capacitor configured as described above, when the pressure in the lower storage portion increases due to abnormality of the capacitor element 3, the polymer film 2 swells upward and pushes up the spacer 12. At this time, the movable piece 7 is also pushed up with the terminal block 11 a side as a fulcrum, and the movable contact 8 is separated from the fixed contact 9 of the first fixed piece 10. When the movable piece 7 is further pushed up, the movable contact 20 of the movable piece 7 contacts the fixed contact 21 of the second fixed piece 22. At this time, a voltage is generated between the external terminal 5 and the abnormality detection terminal 24, and this voltage is applied to an electronic circuit (not shown) mounted on the product to detect the abnormal state of the capacitor element 3.

  As described above, according to the eighth embodiment, the abnormality detection terminal 24 is added, and when the capacitor element 3 is abnormal, the movable piece 7 is switched to the second fixed piece 22 side to detect the abnormality with the external terminal 5. Since a voltage is generated between the terminal 24 and the capacitor 24, the abnormal state of the capacitor element 3 can be detected externally. For this reason, the power supply to the abnormal capacitor element 3 is supplied to an external electronic circuit (not shown). It is possible to obtain an electrolytic capacitor with higher safety.

When the movable contact 20 and the fixed contact 21 are made of, for example, a gold contact or a silver contact having excellent corrosion resistance and poor welding resistance, the contact between the movable contact 20 and the fixed contact 21 is ensured, and the capacitor element 3 An abnormal state can be reliably output to the outside, and a more reliable electrolytic capacitor can be obtained.
Further, as shown in FIG. 2, a holding member 15 may be provided so that the movable piece 7 does not come into contact with the first fixed piece 10 again when the movable piece 7 is separated from the first fixed piece 10. Further, a silver tin oxide alloy having high welding resistance may be used for the contacts 8 and 9 of the movable piece 7 and the first fixed piece 10. Further, a reversal leaf spring 16 is provided above the polymer film 2 and is reversed when the polymer film 2 expands toward the upper storage portion, and the movable piece 7 is separated from the first fixed piece 10 to be second. The fixed piece 22 may be contacted.

Embodiment 9 FIG.
In the first to eighth embodiments, the contacts 8 and 9 are separated as a method of stopping power supply when the capacitor element 3 is abnormal. However, in the ninth embodiment, power is supplied to the capacitor element 3 by cutting the electric wire. Is described below with reference to FIG.
FIG. 8 is a sectional view showing the structure of the electrolytic capacitor according to the ninth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.

  The electrolytic capacitor according to the ninth embodiment includes a blocking lead wire 25 having one end fixed to the terminal block 11a and the other end fixed to the terminal block 11b, and extending in parallel with the polymer film 2, and the polymer film 2. A lower blade 26 having a sharp tip fixed to the upper surface of the capacitor case 1 and an upper blade 27 having a sharp tip attached to the upper inner surface of the capacitor case 1 are provided. The above-described blocking lead wire 25 is, for example, a bare wire, and has one end connected to the cathode foil of the capacitor element 3 via the lead wire 6 and the other end connected to the external terminal 14 via the lead wire 13. Yes. The lower blade 26 and the upper blade 27 are a pair of cutting members, which are made of an insulating material, and usually sandwich the blocking lead wire 25.

  In the electrolytic capacitor configured as described above, power is supplied to the capacitor element 3 by applying a voltage to the external terminal 5 and the external terminal 14. When the pressure in the lower storage portion increases due to an abnormality in the capacitor element 3, the polymer film 2 swells upward, and accordingly, the lower blade 26 moves upward to push up the blocking lead wire 25. Then, the blocking lead wire 25 is further sandwiched and cut by the lower blade 26 and the upper blade 27. As a result, power supply to the capacitor element 3 is interrupted.

  As described above, according to the ninth embodiment, when the polymer film 2 expands, the lower blade 26 and the upper blade 27 cut the cutoff lead wire 25 and cut off the power supply to the capacitor element 3. As a result, an electrolytic capacitor that is simple in structure and relatively small in size can be obtained, and since there is no contact portion on the lead wires 6 and 13, there is no risk of contact failure, and the electrolytic capacitor can be used normally. Sometimes, there is an effect that a more reliable electrolytic capacitor can be obtained.

  In addition, the cutting lead wire 25 can be easily cut by using aluminum or tin having a lower hardness than copper wire, which is a general electric wire material, or an alloy wire thereof, as the material of all or only the cutting lead wire 25. Thus, an electrolytic capacitor with higher safety can be obtained.

Embodiment 10 FIG.
In the ninth embodiment, the cutting lead wire 25 is cut only by the expansion operation of the polymer film 2. However, in the tenth embodiment, the cutting lead wire 25 is cut by the reversing operation of the reversing leaf spring 16. This will be described below with reference to FIG.
FIG. 9 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the tenth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 9 demonstrated in FIG. 8, and description is abbreviate | omitted.

  The electrolytic capacitor according to the tenth embodiment is provided with a reversing leaf spring 16 whose both ends are fixed to the terminal blocks 11 a and 11 b so as to be reversible, and a lower blade 26 is attached to the upper surface of the reversing leaf spring 16. The reversal leaf spring 16 is bent downward at the center and is in contact with the upper surface of the polymer film 2. The reversal leaf spring 16 is reversed when the center is pushed upward from both ends by the swelling of the polymer film 2, and the lower blade 26. Is moved upward. Further, an upper blade 27 whose tip is in contact with the blocking lead wire 25 is attached to the upper inner surface of the capacitor case 1.

  In the electrolytic capacitor configured as described above, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 swells upward and pushes up the central portion of the reversal leaf spring 16. And when the center part of the inversion leaf | plate spring 16 becomes higher than the position of the both ends fixed to the terminal blocks 11a and 11b, it reverses upwards and the lower blade 26 is moved upwards. At this time, the cutting lead wire 25 between the upper blade 27 and the upper blade 27 is cut so as to be sandwiched, and the power supply to the capacitor element 3 is stopped. As a result, heat generation and gas generation of the capacitor element 3 are eliminated, and the increase in internal pressure is stopped.

  As described above, according to the tenth embodiment, the breaking lead wire 25 is cut by utilizing the reversing operation of the reversing leaf spring 16, so that the cutting operation is fast and the breaking lead wire 25 is securely connected. Since the disconnection lead wire 25 can be cut for a short time, the unstable state becomes short in the energized state of the capacitor element 3, and the capacitor element 3 is less likely to cause an abnormal operation. Thus, there is an effect that a highly reliable electrolytic capacitor can be obtained.

Embodiment 11 FIG.
In the ninth and tenth embodiments, the cut-off state of the blocking lead wire 25 is not known from the outside. However, the eleventh embodiment is provided with a blocking display tag interlocked with the reversal of the reversing leaf spring 16 and cut. The state is understood, and will be described below with reference to FIG.
FIG. 10 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the eleventh embodiment. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 10 demonstrated in FIG. 9, or an equivalent, and description is abbreviate | omitted.

  In the drawing, the blocking display tag 17b extending upward from the reversing leaf spring 16 is formed of a pair of plates formed integrally on both sides of the triangular surface of the lower blade 26, and a blocking lead is provided between the tip portions. Line 25 is interposed. When the reversing leaf spring 16 is reversed, the blocking display tag 17b has a tip projecting from a through-hole 18 provided in the upper part of the capacitor case 1.

  In the electrolytic capacitor configured as described above, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 swells upward and pushes up the central portion of the reversal leaf spring 16. And when the center part of the inversion leaf | plate spring 16 becomes higher than the position of the both ends fixed to the terminal blocks 11a and 11b, it reverses upwards and the lower blade 26 is moved upwards. At this time, the cutting lead wire 25 between the upper blade 27 and the upper blade 27 are cut so as to be sandwiched so that the power supply to the capacitor element 3 is stopped, and the interruption display tag 17b formed integrally with the lower blade 26 The tip protrudes from the through hole 18.

  As described above, according to the eleventh embodiment, the blocking display tag 17b that interlocks with the reversal of the reversing leaf spring 16 is provided, and the leading end of the blocking display tag 17b protrudes from the through-hole 18 when the blocking lead wire 25 is cut. Therefore, the cut state can be visually discriminated from the outside, and it is easy to check a defective electrolytic capacitor at the time of repair, and an electrolytic capacitor with good serviceability can be obtained.

Embodiment 12 FIG.
In the twelfth embodiment, a protrusion is provided in the vicinity of the through hole 18 of the capacitor case 1 and will be described below with reference to FIG.
FIG. 11 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the twelfth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 11 demonstrated in FIG. 10, and description is abbreviate | omitted.
In the figure, a protrusion 28 is provided in the vicinity of the through hole 18 of the capacitor case 1. The protruding portion 28 is formed longer than the protruding height of the distal end portion of the blocking display tag 17 b when protruding from the through hole 18.

  Thus, in the electrolytic capacitor having the protrusions 28, when the pressure in the lower storage portion increases due to the abnormality of the capacitor element 3, the polymer film 2 swells upward and the reversing leaf spring 16 Reverse operation. At this time, the blocking lead wire 25 is cut so as to be sandwiched between the upper blade 27 and the lower blade 26, and the tip of the blocking display tag 17 b formed integrally with the lower blade 26 protrudes from the through hole 18. When the front end portion of the blocking display tag 17b protrudes, a space in the height direction is secured by the protrusion 28 provided in the vicinity of the through hole 18, so that the front end portion of the blocking display tag 17b is surely connected to the through hole 18. Protrude from.

As described above, according to the twelfth embodiment, the protrusion 28 higher than the tip of the blocking display tag 17b when protruding from the through hole 18 is provided in the vicinity of the through hole 18 of the capacitor case 1, and the height direction Thus, the operation of the shut-off display tag 17b when the capacitor element 3 is abnormal is ensured, and there is an effect that a more reliable electrolytic capacitor can be obtained.
In the twelfth embodiment, the present invention is applied to the eleventh embodiment described with reference to FIG. 10. However, the present invention is not limited to this and may be applied to the electrolytic capacitors of the fifth to seventh embodiments. .

  In addition, the shape of the protruding portion 28 may be a semicircular shape with the through-hole 18 as the center, or a shape having a plurality of protruding portions 28.

Embodiment 13 FIG.
FIG. 12 is a sectional view showing the structure of the electrolytic capacitor according to the thirteenth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.
The electrolytic capacitor according to the thirteenth embodiment is provided with a vent 29 at the top of the capacitor case 1 as shown in the figure. The vent 29 is for releasing the air in the upper storage portion, whose pressure rises due to the expansion of the polymer film 2, to the outside.

  Thus, in the electrolytic capacitor having the vent hole 29, when the pressure in the lower storage portion increases due to abnormality of the capacitor element 3, the polymer film 2 swells upward (illustrated by a dotted line) as in the first embodiment, The spacer 12 is pushed up. At this time, the movable piece 7 is also pushed up with the terminal block 11a side as a fulcrum, the movable contact 8 is separated from the fixed contact 9 (illustrated by a dotted line), and the power supply to the capacitor element 3 is stopped. When the polymer film 2 expands upward, the air in the upper storage portion is pushed out of the capacitor case 1 through the vent hole 29, so that the pressure does not increase and the polymer film 2 is easily expanded.

  As described above, according to the thirteenth embodiment, by providing the vent hole 29 in the upper part of the capacitor case 1, when the internal pressure rises due to abnormality of the capacitor element 3, the polymer film 2 is easily expanded upward. Thus, the separation operation of the contacts 8 and 9 is ensured, and there is an effect that a more reliable electrolytic capacitor can be obtained.

  In the thirteenth embodiment, the vent hole 29 is provided in the capacitor case 1 that separates the contacts 8 and 9 only by the expansion of the polymer film 2. However, the present invention is not limited to this. The vent case 29 may be provided in the capacitor case 1 that separates the contacts 8 and 9 by the reversing operation of the capacitor, and the breaker lead wire 25 is cut in conjunction with the expansion of the polymer film 2. The vent hole 29 may be provided in the case 1, and the vent hole 29 may be provided in the capacitor case 1 that cuts the blocking lead wire 25 by the reversing operation of the reversing leaf spring 16.

1 is a cross-sectional view illustrating a configuration of an electrolytic capacitor according to a first embodiment. 6 is an enlarged cross-sectional view of an upper storage portion of an electrolytic capacitor according to Embodiment 2. FIG. 6 is a cross-sectional view showing a configuration of an electrolytic capacitor according to Embodiment 4. FIG. FIG. 10 is an enlarged cross-sectional view illustrating an upper storage portion of an electrolytic capacitor according to a fifth embodiment. FIG. 10 is a cross-sectional view showing a configuration of an electrolytic capacitor according to a sixth embodiment. FIG. 10 is an enlarged cross-sectional view illustrating an upper storage portion of an electrolytic capacitor according to a seventh embodiment. FIG. 10 is a cross-sectional view illustrating a configuration of an electrolytic capacitor according to an eighth embodiment. FIG. 10 is a cross-sectional view illustrating a configuration of an electrolytic capacitor according to a ninth embodiment. FIG. 12 is a cross-sectional view illustrating a configuration of an electrolytic capacitor according to a tenth embodiment. FIG. 12 is a cross-sectional view showing a configuration of an electrolytic capacitor according to an eleventh embodiment. FIG. 16 is a cross-sectional view showing a configuration of an electrolytic capacitor according to a twelfth embodiment. FIG. 16 is a cross-sectional view showing a configuration of an electrolytic capacitor according to a thirteenth embodiment.

Explanation of symbols

  1 capacitor case, 2 polymer film, 3 capacitor element, 4 sealing material, 5 external terminal, 6 lead wire, 7 movable piece, 8 movable contact, 9 fixed contact, 10 fixed piece (first fixed piece), 11a, 11b terminal block, 12 spacer, 13 lead wire, 14 external terminal, 15 holding member, 16 reversing leaf spring, 16a first reversing leaf spring, 16b second reversing leaf spring, 17, 17a, 17b shut off display tag, 18 Through-hole, 20 movable contact, 21 fixed contact, 22 second fixed piece, 23 lead wire, 24 anomaly detection terminal, 25 blocking lead wire, 26 lower blade, 27 upper blade, 28 protrusion, 29 vent.

Claims (15)

A stretchable polymer film that is formed to be stretched in the capacitor case and partitions the space in the capacitor case up and down;
A capacitor element provided in a lower storage portion formed by the partition of the polymer film;
Provided in the upper storage portion formed by the partition of the polymer film, comprising a normally closed movable piece and a fixed piece inserted into the lead wire of the capacitor element,
The electrolytic capacitor, wherein the movable piece is separated from the fixed piece when the polymer film expands toward the upper storage portion. A stretchable polymer film that is formed to be stretched in the capacitor case and partitions the space in the capacitor case up and down;
A capacitor element provided in a lower storage portion formed by the partition of the polymer film;
A normally closed movable piece and a fixed piece, which are provided in the upper storage portion formed by the partition of the polymer film, and are inserted into the lead wires of the capacitor element;
Another fixing piece disposed above the fixing piece,
When the polymer film expands toward the upper storage part, the movable piece is separated from the fixed piece and comes into contact with another fixed piece, and the electric power of the capacitor element is output to the outside as an abnormality report signal. An electrolytic capacitor characterized by the above.   3. The electrolytic capacitor according to claim 2, wherein a material having excellent corrosion resistance and inferior welding resistance is used for the contact portion of the movable piece and the other fixed piece.   The electrolytic capacitor according to claim 1, wherein a vent is provided in an upper part of the capacitor case. A stretchable polymer film that is formed to be stretched in the capacitor case and partitions the space in the capacitor case up and down;
A capacitor element provided in a lower storage portion formed by the partition of the polymer film;
A normally closed movable piece and a fixed piece, which are provided in the upper storage portion formed by the partition of the polymer film, and are inserted into the lead wires of the capacitor element;
A blocking display tag attached to the movable piece;
A through hole provided in the upper part of the capacitor case above the shutoff display tag,
When the polymer film expands to the upper storage portion side, the movable piece is separated from the fixed piece, and the blocking display tag moves upward in conjunction with the movable piece, and the tip portion extends from the through hole. Is an electrolytic capacitor characterized by protruding.   It is installed in the vicinity of the through hole provided in the upper part of the capacitor case, and has a protrusion formed longer than the protruding height of the tip of the blocking display tag when protruding from the through hole. Item 6. The electrolytic capacitor according to Item 5.   The electrolytic member according to claim 1, further comprising a holding member that holds the movable piece so that the movable piece does not come into contact with the fixed piece again when the movable piece is separated from the fixed piece. Capacitor.   The electrolytic capacitor according to claim 1, wherein a welding-resistant material is used for contact portions of the movable piece and the fixed piece.   A reversing leaf spring is provided above the polymer film, reverses to the movable piece side when the polymer film expands toward the upper storage portion, and separates the movable piece from the fixed piece. The electrolytic capacitor according to any one of claims 1 to 6. An inversion leaf spring that is provided above the polymer film and reverses to the movable one side when the polymer film expands to the upper storage part side;
Another reversing leaf spring provided in parallel with the reversing leaf spring,
The blocking display tag is attached to the other reversing leaf spring,
The through hole is provided in the upper part of the capacitor case above the another reversing leaf spring,
When the polymer film expands toward the upper storage portion, the two reversing leaf springs are reversed at the same time, the movable piece is separated from the fixed piece, and the blocking display tag is moved upward from the through hole. The electrolytic capacitor according to claim 5 or 6, wherein the tip portion protrudes. A stretchable polymer film that is formed to be stretched in the capacitor case and partitions the space in the capacitor case up and down;
A capacitor element provided in a lower storage portion formed by the partition of the polymer film;
Provided in the upper storage portion formed by the partition of the polymer film, and a blocking lead wire inserted into the lead wire of the capacitor element,
A pair of cutting members that are provided in the upper storage portion and cut in such a manner that the blocking lead wire is sandwiched from above and below when the polymer film expands toward the upper storage portion. Electrolytic capacitor to be used.   12. The electrolytic capacitor according to claim 11, wherein a metal wire having a strength lower than that of a copper wire is used for a part or all of the blocking lead wire. Provided above the polymer film, comprising a reversing leaf spring that reverses to the blocking lead wire side when the polymer film expands to the upper storage part side;
When the reversing leaf spring is reversed to the blocking lead wire side, one cutting member of the pair of cutting members moves upward, and the cutting lead wire is cut with the other cutting member. The electrolytic capacitor according to claim 11 or 12, characterized in that: A blocking display tag that moves upward in conjunction with the reversal of the reversing leaf spring;
The electrolytic capacitor according to claim 13, further comprising a through hole provided at an upper part of the capacitor case and projecting a tip end portion of the blocking display tag.   The electrolytic capacitor according to claim 11, wherein a vent is provided in an upper part of the capacitor case.

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