CN1046818C

CN1046818C - Method for making electrolytic capacitor

Info

Publication number: CN1046818C
Application number: CN95109452A
Authority: CN
Inventors: 成泽鸿; 打越刚二
Original assignee: Adebayor Fox Co Ltd; Shoei Co Ltd
Current assignee: Adebayor Fox Co Ltd; Shoei Co Ltd
Priority date: 1994-07-05
Filing date: 1995-07-05
Publication date: 1999-11-24
Anticipated expiration: 2015-07-05
Also published as: CN1134030A

Abstract

An electrolytic capacitor is manufactured by coiling an anode foil with a lead terminal fixed thereto, a cathode foil with a lead terminal fixed thereto, and a separator into a capacitor assembly, placing a sealing cap of an elastomeric material on the lead terminals which are inserted through respective holes defined in the sealing cap after an adhesive is applied in the holes, thereby attaching the sealing cap to the capacitor assembly, and heating the adhesive until the adhesive is fully set, thereby bonding the lead terminals and the sealing cap to each other. Thereafter, the capacitor assembly is impregnated with an electrolytic solution, and the capacitor assembly with the sealing cap attached thereto is inserted into a case and sealing the capacitor assembly in the case. The electrolytic capacitor thus manufactured has a relatively simple structure to effectively prevent the electrolytic solution from leaking out, and also has a long service life and is highly reliable.

Description

The manufacture method of electrolytic capacitor

The present invention relates to prevent that electrolyte is dry, improve the method for the manufacturing electrolytic capacitor of reliability.

The reason that electrolytic capacitor damages is a lot, scatters and disappears but main cause is an electrolyte, therefore, must improve this, to improve reliability.

Usually, the electrolytic capacitor life-span lacks as you know, thereby reliability is low, and ordinary circumstance can guarantee 1000～2000 hours life-span at most.

In numerous electronic components, though it is a so short element of life-span, used in a large number, this some special case of can saying so, but because of having the advantage that overwhelms from aspects such as small-sized, big capacity, low price, so can not be replaced by other capacitor.

But with high performance, the densification of electronic equipment, also the strong request electrolytic capacitor increases the life-span simultaneously.

Usually, the reason that electrolytic capacitor damages has that electrolyte is rotten, alumite is impaired or the like, and main cause is scattering and disappearing of electrolyte, thereby if can prevent that electrolyte is dry, just can life-saving.

Known electrolytes is lost by the seal 8 of rubber system.But, though such shortcoming is arranged, but still use rubber, its reason is because assembling easily, and as explanation in the following process B-4 like that, when the crimping that carries out in order to repair-deficiency, because of in Cathode Foil 3 generation hydrogen make, pressing liter, in order to prevent that aluminum hull 9 from damaging, and use the rubber that easily sees through hydrogen.

In general life test, be that capacitor is placed the situation of measuring characteristic degradation under the environmental condition of maximum operation (service) temperature, under such static environment condition, to be electrolyte flow out to outside form to seal 8 diffusions of rubber system to main state.

But capacitor is because of being energized inner heat in the user mode of reality, and concrete condition changes.Under such dynamic environment condition,, cause that electrolyte or electrolyte steam spill because the increase and decrease of internal pressure surpasses the sealing limit between lead terminal 1 and the seal 8.

Under aforesaid dynamic environment condition, even under the user mode in the rated range of electricity, the life-span also is reduced to 1/5th～6, and this is by experimental verification.

Particularly, be about 1.5[air pressure at first in the sealing limiting pressure on the joint interface of lead terminal 1 and seal 8] about, just drop to 1[air pressure after about 6 months] below.

When being installed to capacitor on the printed circuit board (PCB), stress is added on the lead terminal 1 particularly mostly when being separated with dimensional discrepancy between the interval of lead terminal 1 and the patchhole that forms on printed circuit board (PCB), will be subjected to big stress on lead terminal 1.

As mentioned above, owing to there are all mal-conditions,, make the lost of life because near the forfeiture of the sealing the electrolytic capacitor lead terminal causes electrolyte to scatter and disappear.

Scattering and disappearing of above-mentioned such electrolyte, experience show can make electrical equipment produce contingency.

In recent years because the electrolyte property of γ-J lactone as solvent well widely used, but the boiling point of this electrolyte is up to 204 ℃, in the time of on draining to printed circuit board (PCB), owing to be difficult to evaporation, short circuit becomes the reason that causes short circuit between printed circuit board, owing to can cause burnout failure.

Now occurred above-mentioned electrolyte is spilt the electrolytic capacitor of having taked all countermeasures.But also do not find really effectively.Below the one example is described.

Figure 13 is in the present invention in order to the major part sectional view of explanation as an electrolytic capacitor in the prior art of improving object, the symbolic representation same section identical with the used symbol of Figure 11 and Figure 12 or have same meaning.

Among the figure, the 12nd, epoxy resin film.

This electrolytic capacitor is made by the technology identical substantially with the technology of Figure 11 of the present invention and Figure 12 explanation, unique difference is at operation 12C-(2) afterwards, flows to epoxy resin and make it sclerosis to form epoxy resin film 12 on the surface of the seal 8 of rubber system.

But, in the manufacturing of electrolytic capacitor shown in Figure 13, when forming epoxy resin film 12,, must after capacitor core 7 being sealed in the aluminum hull, just carry out because liquid epoxy resin is flowed into along whole surface.

Its reason is not finish the step that capacitor core 7 is sealed to aluminum hull, and liquid epoxy resin is flowed.

The epoxy resin that uses in above-mentioned steps must be normal temperature hardened.Its reason is that electrolyte will be impaired, and the steam of electrolyte also can hinder the sclerosis of epoxy resin if will increase temperature for sclerosis.

Yet the epoxy resin that characteristic is good is the high temperature constrictive type mostly, and for example the sealed semiconductor device epoxy resin used uses hardening temperature more than 170 ℃ mostly.If can not get good sealing property, can not prevent fully that electrolyte from spilling with normal temperature hardened epoxy resin.

And the thermal endurance of the high temperature that produces perhaps lacked the reliability with the lead terminal sealing when normal temperature hardened epoxy resin shortage was welded fusion scolding tin.

In order to solve the technical problem of above-mentioned use epoxy resin, also can be on the outer surface of the seal of rubber system or medial surface the coated fluoroethylene resin.At this moment, owing to when the polyfurolresin coated is to seal 8, carried out heat treatment, thus do not produce above-mentioned problem when making epoxy resin hard like that, thereby improved the problem that electrolyte scatters and disappears by seal 8.

But, according to this prior art, when connecting lead terminal 1 in the hole of inserting seal 8, though be suitable pressure to be added to capacitor core 7 be pressed into, but in the hole of seal 8, owing to only contact between lead terminal 1 and the seal 8, so can not prevent fully that electrolyte from spilling by thrust.

U.S. Pat P4,663,824 disclosed be aluminium electrolytic capacitor and method for making thereof.Wherein, shell and lead-in wire are molded as one, and capacitor core is inserted and is dipped in the shell of interior loading electrolyte.Same plastic closure hot weld is connected on the shell.But in this kind structure, the electrolyte of dipping capacitor core can degenerate because of being heated in the welding heat technology of its postorder.

Electrolytic capacitor of the present invention is in the preparation owing to adopt the high heat-curable adhesive of air-tightness, therefore by between seal and lead terminal, heating, they are bonded together securely, owing to just immerse in the electrolyte after this, therefore overcome USP4, problems such as 663,824 electrolyte degenerates.

U.S. Pat P5,150,283 what relate to is double layer capacitor, it and electrolytic capacitor disclosed by the invention belong to different types of capacitor, though the structure shown in its accompanying drawing 1 and the present invention capacitor shown in Figure 12 is similar a bit,, in the structure of Fig. 1 of this patent, because lead terminal need connect a kind of seal cover of rubber system, therefore the problem that electrolyte is sewed can appear.And in the structure of its Fig. 2, be that capacitor core is packed in the stainless steel casing, folder is welded then with aluminium lamination between stainless steel cover and shell.In the method for making of this capacitor, capacitor core is soaked in the electrolyte; Again capacitor core inserted shell in thereafter; Weld with lid afterwards, owing to be subjected to high-temperature process when the glass envelope is ended technology, therefore, electrolyte can degenerate.Different therewith, the present invention adopts heat-curable adhesive, between lead-in wire and seal cover, or carries out the high sealing of air-tightness between seal cover and shell; After finishing sealing, just carry out the soaking technology that contains of electrolyte,, therefore can not degenerate because electrolyte can not be exposed to high-temperature technology.

In No. 0078001 disclosed electrolytic capacitor of European patent application EP and the method for making thereof, for the electrolytic capacitor core being carried out the sealing of high-air-tightness, and seal with thermosetting resin, by the opening that be arranged at shell add electrolyte thereafter, capacitor core is dipped in this electrolyte, and last reusable heat thermosetting resin is sealed opening.But thermosetting resin makes shell and outside lead bonding.Therefore, outside lead is exposed in the electrolyte, though outside lead can be selected the metal of energy soldering for use, this metal can be corroded by electrolyte.Different therewith, in the present invention, owing to be bonding with thermosetting resin between the part of the inner lead of lead terminal and the lid, therefore, electrolyte can not go between to external leakage internally.Thereby outside lead can not corroded yet.The metal that inner lead can adopt aluminium etc. can not corroded by electrolyte.

The purpose of this invention is to provide the simple structure of a kind of usefulness and prevent that with simple means electrolyte spills in the electrolytic capacitor, and the manufacture method that can improve the electrolytic capacitor of life-span and reliability.

In the present invention, fundamental method is in capacitor core under the state of dipping before the electrolyte, in the through hole of the lead terminal that in seal, forms at least or its closely be close to, apply binding agent, lead terminal and seal that capacitor core is drawn are bonding, and make the binding agent sclerosis in high temperature.

The manufacture method of electrolytic capacitor of the present invention is that Cathode Foil (3) and the spacer (4) with the bonding anode foils (2) of lead terminal (1), bonding lead terminal (1) becomes capacitor core (7) together around twisting in, described capacitor core (7) is sealed in the shell (9 of impregnation electrolyte, 15) Nei method, it is characterized in that it comprises following operation:

(a) operation of a kind of intermediate of preparation

Described intermediate comprises capacitor core (7), seal (8) and binding agent, and described seal has through hole, inserts for lead terminal, and described binding agent is arranged between the lead-in wire mounting portion (1B) and seal of lead terminal inside at least;

(b) bonding process

Then, heat-treat, make described binding agent sclerosis, so that described at least lead terminal and seal bond mutually;

(c) dipping operation

Then, electrolyte is impregnated in the above-mentioned capacitor core;

(d) sealing process

Then, above-mentioned capacitor core is sealed in the shell.

First kind of electrolytic capacitor manufacture method is characterised in that among the present invention,

Described operation (a) comprises the steps;

Form the step of above-mentioned capacitor core; And

In the through hole of seal or near it, coat binding agent, then above-mentioned lead terminal inserted above-mentioned through hole, thereby seal is assemblied in the step of capacitor core,

Described seal is the seal of being made by elastomeric material, and has the through hole that can be inserted by lead terminal,

Described operation (d) comprises that the capacitor core that will load onto described seal inserts in the shell step that seals then.

Second kind of electrolytic capacitor manufacture method is characterised in that among the present invention,

Described operation (a) comprises the steps:

Form the step of capacitor core, and

The lead terminal that scribbles binding agent is inserted in the seal, then the sealing part is assemblied in the step of capacitor core,

Described operation (d) comprises that the capacitor core that will load onto above-mentioned seal inserts in the shell, seals then.

The third electrolytic capacitor manufacture method is characterised in that among the present invention,

Described operation (a) comprises the steps:

Form the step of capacitor core, then,

Lead terminal is inserted in the through hole of seal, assemble the step of this capacitor core, and, subsequently,

The capacitor core of loading onto above-mentioned seal inserted having venting and hold concurrently in the shell of the opening that injects used for electrolyte, then in the step of the side adhesive stripe-coating that above-mentioned seal is housed,

Described seal is a kind of parts that stop binding agent infiltration, wherein has the through hole that can be inserted by lead terminal,

Described operation (b) comprises heat-treating makes above-mentioned binding agent sclerosis, thereby makes above-mentioned seal and lead terminal bonding mutually, simultaneously capacitor core is sealed in the step in the shell,

Described operation (c) comprises the opening injection electrolyte of holding concurrently and injecting used for electrolyte from above-mentioned venting, makes the step of above-mentioned capacitor core dipping electrolyte,

Described operation (d) comprises the closure of openings of above-mentioned venting hold concurrently being injected used for electrolyte, and with the step of body seal.

The 4th kind of electrolytic capacitor manufacture method is characterised in that among the present invention,

Described operation (a) comprises the steps:

Form the step of capacitor core and then,

Capacitor core inserted having hold concurrently step in the shell of the opening that injects used for electrolyte of venting, subsequently,

Lead terminal is inserted in the through hole of seal, thus the step that seal is combined with capacitor core, and,

The side that above-mentioned seal has been housed in shell is coated with the step that applies bonding agent,

Described seal is a kind of prevention binding agent infiltration parts, wherein has the through hole that can be inserted by lead terminal,

Described operation (b) comprises heat-treats, and makes binding agent sclerosis, thereby makes above-mentioned seal and lead terminal bonding, simultaneously capacitor core is sealed in the shell,

In above-mentioned the 3rd, the 4th kind of manufacture method of the present invention, it is characterized in that further seal (for example stoping binding agent infiltration parts) is separated (for example half partly is respectively 241 and 242) along the line of the pair of holes (for example hole 24A) by holding lead terminal.

And a plurality of capacitor cores of band lead terminal can be by being contained in lead terminal on the conveyer belt, on one side transmit a plurality of capacitor cores with conveyer belt, Yi Bian carry out the manufacturing of a plurality of electrolytic capacitors.

In addition, the present invention comprises that also the part with heating iron (for example heating iron 21) heating and the above-mentioned shell of conquassation makes it to be pressed in the operation on the above-mentioned seal with behind its seal insertion shell in the manufacture method of above-mentioned the 3rd, the 4th invention.

The present invention also comprises in the manufacturing of the 3rd, the 4th invention and will advance above-mentioned opening in order to hold concurrently key (for example key 17) intercalation of the opening that injects used for electrolyte of sealing venting, the operation of the state lower sealed outer housing that joins at the front end and the capacitor core of key.

If further according to the present invention, comprise also that in above-mentioned the 3rd, the 4th invention its front end of use has heating iron (for example with reference to Fig. 5) the sealing venting of concave curved surface to hold concurrently and injects the opening of used for electrolyte.And after closure, reduce the temperature of above-mentioned heating iron, with its operation of taking off from shell.In addition, also be included in the dipping electrolyte after, the sealing opening before, capacitor core is carried out seasoned operation.

Owing to adopt above-mentioned means, the sealing between the seal of lead terminal and rubber system is improved, therefore, electrolyte does not just spill from this.Also,, thereby improve its fluid tightness under the high temperature that hardens under the non-existent condition of electrolyte so for example epoxy adhesive can be implemented well because the sclerosis of the binding agent between lead terminal and the seal that is bonded and sealed is to carry out.And then also because after lead terminal is derived, this capacitor core is encapsulated into after the shell with liquid seal, can seal simply by putting heating iron etc. in order to venting and the opening that injects electrolyte, so implement easily.

Fig. 1 is in order to the sectional view of explanation by the major part of the electrolytic capacitor of the present invention's making.

Fig. 2 is the perspective view that is illustrated in the major part of the electrolytic capacitor in the master operation is made electrolytic capacitor by the inventive method in order to explanation a operation.

Fig. 3 is the sectional view of the electrolytic capacitor major part in the master operation of the operation of the opening of using the key can in order to detailed description.

Fig. 4 is the sectional view of the major part of the electrolytic capacitor in the master operation of other embodiment of the technology of the peristome of using the key can in order to explanation.

Fig. 5 is in order to the sectional view of explanation with the major part of the electrolytic capacitor in the master operation of other example in the technology of the peristome of key can.

Fig. 6 be in order to explanation by the present invention make with rigid body as seal, promptly stop the sectional view of major part of an example of the electrolytic capacitor of binding agent infiltration parts.

Fig. 7 is the decomposition diagram with the major part of the similar electrolytic capacitor of electrolytic capacitor of Fig. 6 explanation.

Fig. 8 be in order to explanation by the present invention make with rigid body as seal, promptly stop the sectional view of major part of the electrolytic capacitor of binding agent infiltration parts.

Fig. 9 is the key diagram of expression in order to the major part of explanation belt technological process.

Figure 10 illustrates suitable seal part used when adopting belt technology, promptly stops the major part perspective view of binding agent infiltration parts.

Figure 11 is the perspective view that is illustrated in the major part of each member of capacitor in the master operation that the electrolytic capacitor manufacture method is described.

Figure 12 is the perspective view that is illustrated in the electrolytic capacitor major part in the master operation of manufacturing of explanation electrolytic capacitor.

Figure 13 is the perspective view in order to the major part of an electrolytic capacitor of explanation conduct improvement in the present invention object.

Each label implication in the accompanying drawing: 1: lead terminal 15C: negative thread 1A: lead-in wire 15D: extension 1B: mounting portion 15E: heating conquassation part 2: anode foils 17: key 3: Cathode Foil 18: ultrasonic fusing loudspeaker 4: spacer 20A: pin thread 5: spacer 20B: lead end is inserted logical hole 6: spooling band 20C: projection 7: capacitor core 21: heating iron 8: seal 22: conveyer belt 9: shell 23: electrolytic capacitor 10: flanging section (tightening section) 241,242: half one 11 of seal: heat-shrinkable tube 24A: lead end is inserted logical hole 12: epoxy resin film 24B: wedge part 13: binding agent 24C: the key 15 of location usefulness: shell 24D: groove 15A: opening 24E: the keyway 15B of location usefulness: flange portion

Fig. 1 is the sectional view of the major part of the electrolytic capacitor made by the present invention in order to explanation, the symbolic representation same section identical with symbol used among Figure 13 or have same meaning.

13 is typical example such as epoxy adhesive among the figure.

When making this electrolytic capacitor, at first make capacitor core 7 with the technology of Figure 11 explanation.Then with the binding agent coated on the lead terminal 1 of from this capacitor core 7, drawing, after perhaps in the hole of the seal 8 of rubber system, being inserted into seal 8 on the lead terminal 1 the binding agent coated, 190 ℃ of following heat treatments of temperature for example 10 minutes, make the binding agent sclerosis.

At this moment, can use multiple material as binding agent, for example pulverous epoxy resin, powder epoxy resin made sleeve shaped or make the body that is compressed into of hollow bead shape, can become liquid form etc. is object, material also is not limited to epoxy resin, for example can use phenolic resins, silicone resin, fluoroethylene resin etc.

Wherein when using dusty material, lead terminal 1 or seal 8 are heated to suitable temperature, can be under the state that powder is fused to a certain degree coated.

In addition, about being processed into sleeve-shaped or being processed into the body that is compressed into of hollow bead shape, be that this is compressed into the body setting-in to lead terminal, it is connected in the hole of injecting seal 8, also can be in contrast, advance in the hole of seal 8 being compressed into the body setting-in, lead terminal is connected insert this place.

Also have, liquid material, yes coated are on lead terminal 1 or seal 8, and this seems simply, and is least suitable in fact.

Then, the capacitor core 7 that above-mentioned seal 8 is housed is put in the vacuum impregnation plant, gets rid of air in the capacitor core 7 by making in the device decompression, and then inject electrolyte.Injection about this electrolyte it should be noted that, and is the same with prior art, make electrolyte enter anode foils 2 fully because of in the aperture that becomes rough surface and produce.

Cover is gone up aluminum hull 9 again, forms the flanging portion 10 (tightening portion) that is referred to as to call crimping in the contact portion of seal 8 and aluminum hull 9, seals.

Then apply outer dress as required.Dress is the same with prior art in addition, can coat with the heat-shrinkable tube that is printed with the name of manufacturer, model, specification, lot number, polarity etc. on it.

Subsequently, under the high pressure of this rated voltage high 10%, the temperature maintenance that is added to the serviceability temperature upper limit was carried out ageing in about 1 hour.

During ageing,, owing to covering for not bonded dose 13, the part of the seal 8 of rubber system exposes, so hydrogen is emitted without any problem even Cathode Foil produces hydrogen.

Then, check, pick out substandard products, only take out the qualified product of being finished by product specification.

Fig. 2 is the perspective view of major part that is illustrated in the electrolytic capacitor of master operation, make the technology of electrolytic capacitor according to the present invention in order to explanation, describe the symbology same section identical or have same meaning below with the used symbol of Fig. 1, Figure 11～Figure 13 referring to this figure.

With reference to Fig. 2 (A)

2(A)-(1)

When making the electrolytic capacitor of present embodiment, use and make capacitor core 7 in the identical technology of technology illustrated in fig. 11.

2(A)-(2)

Then, the lead terminal that will draw from capacitor core 71 connects in the hole of inserting the seal 8 of rubber system (stoping binding agent infiltration parts) for example, overlaps upper shed 15A then and is positioned at shell 15 on the end face.

Here, the seal 8 of Fig. 2 is different with the seal 8 of Fig. 1, it has not been that capacitor core 7 is sealed to effect in the shell 15, but in order to make binding agent for example bonding with powder epoxy resin or when liquid-state epoxy resin flows, stop the binding agent to flow in the shell 15 and setting.

And shell 15 its materials for example are polyphenylene sulfide (polyphenylene sulfie:PPS), at its end face electrolyte are set and inject the exhaust opening 15A that holds concurrently.

Because the PPS resin is a heat-resistant resin, because the influence that the electrolyte that can adequately protect is not melted the high temperature that is produced in the scolding tin process, thereby suitable mounted on surface.

With reference to Fig. 2 (B)

2(B)-(1)

Subsequently, binding agents such as epoxy resin are coated on a side of the seal 8 (stop binding agent infiltration parts) of shell 15, keep heat-treating in 30 minutes at for example 160 ℃ of high temperature, so that the gas-tight seal of lead terminal 1 is carried out in binding agent 13 sclerosis.In Fig. 2 (B), with shell 15 biopsy cavity marker devices so that can have an X-rayed its inside.

Here, binding agent 13 is the same with embodiment illustrated in fig. 1, can be any states such as powder, liquid state, also can make the sheet that can be inserted logical through hole by lead terminal.When doing slabbing, be laminated into one, processing ease with Fig. 2 seal 8.

2(B)-(2)

Then, said modules integral body is put in the vacuum impregnation plant, makes decompression in the device, the air in the shell 15 is got rid of from opening 15A.

2(B)-(3)

Opening 15A by shell 15 injects electrolyte in shell 15 again.Inject this electrolyte and it should be noted that equally, electrolyte is fully entered in the pore that is produced because of the anode foils surface roughening with prior art.

2(B)-(4)

Then, under the high voltage than rated voltage high about 10%, the temperature that is added to the serviceability temperature upper limit keeps carrying out in about 1 hour ageing.

During ageing, even Cathode Foil produces hydrogen, owing to be communicated with outside atmosphere by opening 15A in the shell 15, releasing hydrogen gas does not have any problem.

With reference to Fig. 2 (C)

2(C)-(1)

Subsequently, use the opening 15A of key 17 cans of making by rubber or plastics elastomeric material 15.

At this moment, keep making the top contacting structure of front end and the capacitor core 7 of key 17,, also can alleviate the stress that adds to lead terminal 1 even when capacitor core 7 vibrates afterwards.In a single day stress be added to lead terminal 1 because leakage current increases, and loss increase etc. become the reason of mis-behave.

With reference to Fig. 2 (D)

2(D)-(1)

After lead terminal 1 being processed into the state of necessity, detect, remove substandard products, take out the qualified product of being finished by the product specification characteristic.

Fig. 3 is the sectional view of the major part of the electrolytic capacitor in master operation, and in order to describe the technology with key can opening in detail, the symbology same section with used symbol is identical among Fig. 2 perhaps has same meaning.

As seen from the figure, when making and its front end is conical key 17 when the opening 15A of shell 15 is pressed into by elastomeric material, its front end enters the room in the volume core of capacitor core 7, but still can remain on the upper end of capacitor core 7, and such structure can make vibration strength improve.

Fig. 4 is the sectional view of the major part of electrolytic capacitor in master operation, and in order to explanation another example with the technology of key can opening, the symbology same section with used symbol is identical among Fig. 2 perhaps has same meaning.

As seen from the figure, the key 17 that the PPS material is made is placed on the opening 15A of shell 15, makes the periphery of opening 15A and key 17 weld sealing by the ultrasonic irradiation from ultrasonic welding horn 18.

At this moment, suitably select the shape and size of key 17 etc., make it can remain on the upper end of capacitor core 7.

Fig. 5 is the sectional view of the major part of the electrolytic capacitor in master operation, is used for illustrating other example of can opening process, with used symbol is identical among Fig. 2 symbology same section or have same meaning.

As seen from the figure owing on the periphery of the peristome 15A of shell 15, form flange portion 15B, by the contact of the heating iron of high temperature by being pressed on this flange portion 15B with its conquassation, with plug for seal opening 15A.

In the present embodiment, suitably select the height of flange portion 15B promptly to heat the amount of resin of conquassation, heating-up temperature, heating time the PPS resin of melting is extruded in shell 15 from opening 15A, can make it outstanding like that as shown.This ledge is the same with key 17 shown in Figure 3, and the last end in contact with capacitor core 7 can help to improve vibration strength.

For the shape with the deposited part above the shell 15 remains the good shape of illustrated repeatability equally, can be after welding finish, the cooling heating iron takes off it behind the PP resin solidification.

But, different with seal 8 shown in Figure 1 with the seal 8 among the embodiment of explanations such as Fig. 1 or Fig. 3 (stoping binding agent infiltration parts), himself there is not the effect of liquid seal, basically it is just passable to stop binding agent 13 to flow in the shell 15, nor requirement has through the character of hydrogen etc.

By the premises as can be known,, except that elastomeric material, also can use the high material of thermal endurance that does not damage electrolyte, for example identical PPS resin or fluoroethylene resin etc. with shell 15 as the prevention binding agent of seal 8 infiltration parts.Mainly be to carry out accurate processing to make the binding agent 13 can not be between lead terminal 1 and the seal 8, or between seal 8 and the shell 15 by just can.

Above-mentioned so-called accurate processing means the gap that makes lead terminal 1 and seal 8, and the gap of seal 8 and shell 15 has not had difficulty but carry out such processing now below 20 μ m.

Thereby using PPS resin, fluoroethylene resin etc. just to make body is fully possible as the material of seal 8 (stop binding agent infiltration parts).When using such rigid body, by applying binding agent 13, make seal 8, shell 15, binding agent 13 become overall structure, be able to take the harsh service condition of electrolytic capacitor fully, for example temperature is 105 ℃, internal pressure 3kg/cm ²And different with rubber, when using rigid body, correctly determine the position of lead terminal 1, directions etc. also have the little advantage of product deviation.

Fig. 6 be in order to explanation made in accordance with the present invention with the sectional view of rigid body as the major part of an example of the electrolytic capacitor of seal 8 (stop binding agent infiltration parts), the part that the symbology identical with symbol used among Fig. 1～Fig. 5 is identical or have identical meaning.

The difference of the electrolytic capacitor of illustrated electrolytic capacitor and Fig. 1～shown in Figure 5 be Fig. 6 seal 8 by rigid body for example the PPS resin constitute.Because the seal 8 of Fig. 6 is rigid bodies, so can utilize screw structural to combine with shell 15.

Certainly, such screw structural is structure not necessarily, even the prevention binding agent infiltration parts that only are circular plate type also are fully can be practical, replace by for example rigid bodies such as 8 usefulness PPS resins such as the seal shown in Fig. 2, Fig. 3 etc., fluoroethylene resin, can obtain various good effects.

So, as shown in Figure 6, on the periphery of seal 8, carve and put external screw 20A, correspondingly on the inboard that the opening of the insertion capacitor core 7 of shell 15 closely is close to, carve then and put negative thread 15C.

Thereby, lead terminal 1 is connected in the hole of inserting seal 8, make capacitor core 7 and seal 8 combinations, can closely be integral among the negative thread 15C with the pin thread 20A precession shell 15 of seal 8, apply binding agent 13 thereon again, can realize the better fluid sealing whereby.Like this, make seal 8 and shell 15 incorporate structures, so the advantage that mechanical strength is improved is also arranged owing to can make.

Here used helicitic texture and common screw thread relatively, big more satisfactory of pitch.Its reason is to make easily during with compression moldings such as PPS resins, and assembling easily.

Fig. 7 is the decomposition diagram of the major part of the expression electrolytic capacitor similar with electrolytic capacitor illustrated in fig. 6, the part that the symbology identical with symbol used among Fig. 6 is identical or have identical meaning.

On the periphery of the seal 8 of Fig. 7, form the pin thread 20A of coarse pitch thread, on the inboard that the opening of the insertion capacitor core 7 of shell 15 closely is close to, form the negative thread 15C of identical coarse pitch thread.

Between a pair of through hole 20B that can be connected of this seal 8, can be easily in the time seize on both sides by the arms and it is executed turn round, form fillet 20C with anchor clamps with seal 8 precession shells 15 by lead terminal 1.Also can form flat recess or the cross recess that the front end of screwdriver etc. can insert and replace this projection 20C.

Fig. 8 also is the sectional view of major part, made in accordance with the present invention rigid body is used for the electrolytic capacitor of seal 8 (stop binding agent infiltration parts) in order to explanation, the part that the symbology identical with the used symbol of Fig. 1～Fig. 7 is identical or have identical meaning.

In the drawings, (A) be the plane of seeing the major part that applies the electrolytic capacitor before the binding agent from the bottom surface, (B) be the side section of edge major part of visible X-X line on the plane of above-mentioned major part, 15D is the extension that makes seal 8 off-positions, 15E is a heating conquassation part, the 21st, and heating iron.

In the present embodiment, seal 8 is installed on the lead terminal 1 of capacitor core 7, its whole insertion in the shell 15, the edge of seal 8 is stopped on the extension 15D of shell 15, press with heating iron 30 and to press after the heating conquassation part 15E, as shown in phantom in FIG., conquassation heating conquassation part 15E can be adhesively fixed seal 8 on shell 15.

After this, the same with other embodiment, by applying binding agent 13 and making its curing carry out liquid seal, then inject electrolyte to carrying out in the shell 15 after the exhaust by opening 15A, after carrying out ageing again, for example as explanation among Fig. 5 (B), use heating iron sealing opening 15A, finish sealing work.

In above-mentioned technology, during heating conquassation heating conquassation part 15E, be preferably in to press under seal 8 some melting situation and press heating iron 21 to make adhesion strength become big,, will improve fluid tightness more if simultaneously the helicitic texture among Fig. 6 and the embodiment illustrated in fig. 7 is used present embodiment again.

Under the situation of present embodiment, be necessary to use the material of thermoplastic resin at least, can obtain good effect when seal 8 also uses thermoplastic resin, so can use of a sort for example PPS resin as shell 15.

Usually not relevant bonding so uneasy of PPS, though the epoxy adhesive reliability is the highest in binding agent, bonding also insufficient with resin moulded of PPS.

Therefore, the molded side of PPS resin is carried out sandblast, ultraviolet irradiation, in embodiment illustrated in fig. 8, owing to become matsurface, so be improved with the caking property of epoxy resin by the thermal welding face of heating iron.

But electrolytic capacitor is to produce in a large number with automated manufacturing system mostly usually, can adopt so-called conveyer belt mode under the sort of situation.

Fig. 9 is the key diagram of expression with the major part of the technological process of explanation conveyer belt mode, the symbology same section identical with the used symbol of Fig. 1～Fig. 8 or have same meaning.

Among the figure, the 22nd, conveyer belt, the 23rd, the electrolytic capacitor of being processed.

In the conveyer belt mode as seen from the figure, with be equipped with the aluminium foil of lead terminal 1 and insulating paper etc. carry out stacked, reel and make capacitor core 7, the part of lead terminal 1 is temporarily stayed on the conveyer belt 22, drive this conveyer belt 22, from the parts that constitute by the capacitor core 7 of drawing lead terminal 1, these parts are processed while transmitting by process route, made electrolytic capacitor 23.

When producing electrolytic capacitor of the present invention with the conveyer belt mode is a large amount of, because lead terminal 1 temporarily rests on the conveyer belt 22, lead terminal 1 was connected in the seal 8 that inserts structure as shown in Fig. 6～Fig. 8, so will implement this technology in the past in above-mentioned temporary transient stop.

Though this technology is not to implement, because the part of shell packaging technology is sneaked in the part of aluminum foil coil winding technologe, just needs to change automated manufacturing system, thereby produce the problem in the process management.

Figure 10 is the perspective view of the major part of the explanation seal 8 that is suitable for adopting the conveyer belt mode, (A) and (B) show the situation of different structure respectively for example.

When implementing conveyer belt mode illustrated in fig. 9, as shown in figure 10, with seal 8 be divided into two more effective.That is to say, in (A), because seal 8 is by constituting along half one 241 and half one 242 of being split to form by the line of inserting a pair of through hole 24A by lead terminal 1, even so lead terminal 1 is persisted on conveyer belt 22, after entering the shell assembling procedure, also can easily combine with lead terminal 1.

Yet, (A) seal 8 shown in is because just be divided into two simply, in the shell assembling procedure, attaching it under the state that capacitor core 1 exposes on the lead terminal 1 is difficult, therefore be necessary after capacitor core 7 is put into shells 15, again seal 8 to be installed on the lead terminal 1, block around it with shell 15.

And in the seal shown in (B) 8, though be divided into half one 24 along line by a pair of through hole 24A ₁With half one 24 ₂The structure this point constant, but half one 24 ₁Be provided with to half one 24 of combination with it ₂The 24B of wedge portion that direction is stretched out is provided with the key 24C that locatees usefulness, simultaneously correspondingly in half one 24 ₂On the groove 24D that can admit the 24B of wedge portion is set, be provided with simultaneously the location usefulness keyway 24E.

When being processed into the structure shown in (B), seal 8 is pressed into the assigned position of shell 15, and the reduced of the shell 15 at assigned position place is some then, and undergauge to 20～30 μ m for example can finish crimping to lead terminal 1 simultaneously with this.

Figure 11 is illustrated in the perspective view that master operation has the major part of each member of capacitor, makes the method for electrolytic capacitor in order to explanation.Figure 12 is the perspective key diagram that is illustrated in the electrolytic capacitor major part in the master operation, in order to the manufacturing of explanation same electrical electrolysis condenser.

With reference to Figure 11 (A)

11(A)-(1)

By the lead-in wire 1A of iron wire or copper wire system, the installation portion 1B that has struck out flat aluminum with the end carries out solder bond, forms lead terminal 1 thus with for example.

With reference to Figure 11 (B)

11(B)-(1)

By using,, make its surface roughening to for example being that corrode on the surface of the anode foils 2 of material with aluminium with wet corrosion method such as the mixed liquor of for example hydrochloric acid or sulfuric acid, nitric acid, acetate etc. as corrosive agent.

11(B)-(2)

By using anode oxidation method, anode foils 2 is impregnated into carries out surperficial chemical combination in the electrolyte to form oxide-film.

11(B)-(3)

With riveting or ultrasonic bonding lead terminal 1 is fixed to anode foils 2 and the Cathode Foil 3 for example done by aluminium on.

With reference to Figure 11 (C) and (D)

11(C)-(1)

With anode foils 2, by spacer 4, Cathode Foil 3 that insulating paper is made, the spacer of being made by insulating paper 5 is piled up, and integral body is rolled into the garden cylindricality, fixes the end with spooling band 6 and forms capacitor core 7.

With reference to Figure 12 (A)

12(A)-(1)

Capacitor core 7 is placed vacuum impregnation plant, making decompression in the device get rid of air in the capacitor core 7 after, inject electrolyte.

The electrolyte that injects immerses in the pore that anode foils 2 generates because of surface roughening.

In addition to the above methods, also may be implemented in the simple method that only capacitor core 7 is impregnated in the atmosphere in the electrolyte.

With reference to Figure 12 (B)

12(B)-(1)

The seal 8 of rubber system is pressed into after the lead-in wire 1A that draws from capacitor core 7, seals aluminum hull 9, form the flanging portion 10 that is called crimping and seal in seal 8 and aluminum hull 9 part that contacts.

With reference to Figure 12 (C)

12(C)-(1)

Carry out external packing as required.During external packing, be printed with the heat-shrinkable tube 11 of manufacturer's name, model, specification, lot number, polarity etc. on usually topped.

12(C)-(2)

At high about 10% high voltage and make under the ceiling temperature of temperature and keep carrying out in about a hour ageing than rated voltage.This is the defective of repairing oxide-film in the anode foils 2 that main work in-process causes for the self-repair function that utilizes electrolytic capacitor.

The difference that this aging condition is created conditions with electrolytic capacitor and difference, each manufacturing firm according to circumstances stipulates various aging conditions.

12(C)-(3)

Test by product specification, reject substandard products.

In the present invention, be not limited to the various embodiments described above, can realize other many variations,, certainly lead terminal also is suitable for from the double-end form of capacitor respectively though for example in the various embodiments described above, only exemplify out the form that lead terminal is all drawn from an end of capacitor, if under the sort of situation, embodiment as shown in Figure 2 is when need are provided with the structure of opening, in order to draw lead terminal, existing when improper of opening, certainly opening is moved on to suitable place.

Making according to the present invention in the method for electrolytic capacitor, coiling is bonded with the anode foils of lead terminal, the Cathode Foil that is bonded with lead terminal and spacer, form capacitor core, make lead terminal connect insert in the through hole of seal 8 and be installed on the capacitor core, to heat-treat in order making to harden fully, electrolyte to be impregnated in the capacitor core to the binding agent of major general's lead terminal and seal 8 gas-tight seals.

By adopting said structure, the sealing between the seal of lead terminal and rubber system is improved, thereby electrolyte can not spill.Since be in the sclerosis that does not have to carry out under the situation of electrolyte in order to the binding agent between adhering and sealing lead-out wire terminal and the seal 8, thus the good sclerosis of epoxy adhesive can be implemented at high temperature, thereby improved its fluid tightness.And owing to after the capacitor core that will draw lead terminal is encapsulated into shell by liquid seal, can put heating iron etc. simply, the sealing venting is held concurrently and is injected the opening of electrolyte whereby, thereby implements easily.

Claims

1. the manufacture method of an electrolytic capacitor, described method is that Cathode Foil (3) and the spacer (4) with the bonding anode foils (2) of lead terminal (1), bonding lead terminal (1) becomes capacitor core (7) together around twisting in, described capacitor core (7) is sealed in the shell (9 of impregnation electrolyte, 15) Nei method, it is characterized in that it comprises following operation:

(a) operation of a kind of intermediate of preparation

(b) bonding process

(c) dipping operation

Then, electrolyte is impregnated in the above-mentioned capacitor core;

(d) sealing process

Then, above-mentioned capacitor core is sealed in the shell.

2. the manufacture method of electrolytic capacitor according to claim 1 is characterized in that,

Described seal is a kind of seal,

Described operation (a) comprises the steps;

Form the step of above-mentioned capacitor core; And

The seal that described seal is made by elastomeric material, and have the through hole that can be inserted by lead terminal,

Described operation (d) comprises that the capacitor core that will assemble above-mentioned seal inserts in the shell step that seals then.

3. the manufacture method of electrolytic capacitor according to claim 1 is characterized in that,

Described seal is a kind of seal

Described operation (a) comprises the steps:

Form the step of capacitor core, and

Described operation (d) comprises that the capacitor core that will load onto described seal inserts in the shell, seals then.

4. the manufacture method of electrolytic capacitor according to claim 1 is characterized in that,

Described seal is a kind of prevention binding agent infiltration parts,

Described operation (a) comprises the steps:

Form the step of capacitor core, then,

5. the manufacture method of electrolytic capacitor according to claim 1 is characterized in that,

Described seal is a kind of prevention bonding agent infiltration parts,

Described operation (a) comprises the steps:

Form the step of capacitor core and then,

Capacitor core inserted having hold concurrently step in the shell of the opening that adds used for electrolyte of venting, subsequently,

Described operation (d) comprises the closure of openings of above-mentioned venting hold concurrently being injected electrolyte week, and with the step of body seal.

6. according to the manufacture method of claim 4 or 5 described electrolytic capacitors, it is characterized in that described seal is separated along the line that holds a pair of through hole of lead terminal.

7. the manufacture method of electrolytic capacitor according to claim 6, it is characterized in that a plurality of capacitor cores of band lead terminal are contained on the conveyer belt by this lead terminal, use above-mentioned conveyer belt, transmit a plurality of capacitor cores on one side, Yi Bian carry out the manufacturing step of a plurality of electrolytic capacitors.

8. according to the manufacture method of claim 4 or 5 described electrolytic capacitors, it is characterized in that, it comprise insert described seal in the shell after, with the part of the above-mentioned shell of heating iron heating extrusion, thereby its is pressed by the step to above-mentioned seal.

9. according to the manufacture method of claim 4 or 5 described electrolytic capacitors, it is characterized in that, it comprises that the key intercalation that will the double closure of openings of injecting used for electrolyte of venting be used on above-mentioned opening, makes the front end of key and capacitor core be the state that joins, with the step of can.

10. according to the manufacture method of claim 4 or 5 described electrolytic capacitors, it is characterized in that this method comprises that with heating iron venting being held concurrently injects the closure of openings of used for electrolyte, with the step of can.

11. the manufacture method of electrolytic capacitor according to claim 10 is characterized in that, states heating iron in the use and seals after above-mentioned opening and the can, makes this heating iron cooling, takes off heating iron from above-mentioned shell then.

12. the manufacture method according to claim 4 or 5 described electrolytic capacitors is characterized in that, before the above-mentioned opening of the above-mentioned electrolyte rear enclosed of dipping above-mentioned capacitor core is carried out ageing.