CN202905476U - Solid electrolytic condenser - Google Patents
Solid electrolytic condenser Download PDFInfo
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- CN202905476U CN202905476U CN 201220435862 CN201220435862U CN202905476U CN 202905476 U CN202905476 U CN 202905476U CN 201220435862 CN201220435862 CN 201220435862 CN 201220435862 U CN201220435862 U CN 201220435862U CN 202905476 U CN202905476 U CN 202905476U
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Abstract
The utility model provides a solid electrolytic condenser which overcomes tedious manufacturing procedures, increases electrostatic capacity, and prevents increase in lead-out resistor. The solid electrolytic condenser comprises: a cuboid component which flattens a winding component formed by winding anode foil, cathode foil and a separator between the anode foil and the cathode foil into a cuboid so as to form a solid electrolyte; an anode lead-out terminal; a cathode lead-out terminal; a packaging body which packages the cuboid component; and a lead-out frame which is exposed out of the packaging body. The anode lead-out terminal and the cathode lead-out terminal, relative to a winding core of the cuboid component, are configured at a single side. A second plate-shaped part is farther from the winding core than a first plate-shaped part. A first exposed part is thicker than the first plate-shaped part and protrudes towards a winding core side. A second exposed part is thicker than the second plate-shaped part and protrudes towards the winding core side farther than the first plate-shaped part. The part of the second exposed part protruding out of the second plate-shaped part is higher than that of the first exposed part protruding out of the first plate-shaped part.
Description
Technical field
The utility model relates to a kind of solid electrolytic capacitor.
Background technology
In recent years, along with high performance, the miniaturization of electronic equipment, consider that molding chip (molded chip) part of the packing density of part has become main flow.Aluminium electrolytic capacitor is no exception, and the aluminium electrolytic capacitor that (Surfaced MountingTechnology, SMT) installed on the surface also is widely used.
Surface mounting technology is Electronic Assemblies technology of new generation, traditional electronic component is compressed to 1/tens of front volume, thereby has realized high density, high reliability, miniaturization, low cost and the production automation that electronic component is installed.But in the situation that aluminium electrolytic capacitor, common surperficial mounted article is vertical (general designation V chip), has restriction in the electronic equipment that requires the low back of the body.
As in order to overcome the technology of above-mentioned shortcoming, proposed in solid electrolyte layer, to have used the convoluted molding chip of polyaniline.But, for columniform winding element is carried out molding, restrict, still occupy larger thickness space after the encapsulation and exist the winding element diameter to produce, be difficult to satisfy the problem of lower back of the body requirement.And, as Second Problem, existence can form element the moulding core chip-type solid electrolytic capacitor of thinner lamination structure, but when the polypyrrole that forms as solid electrolyte layer, form the chemical polymerization film at ground floor, make second layer electrolysis polymerization, in the method, electrolysis polymerization needs the long period, and then this electrolysis polymerization must process and welding with the corresponding amount of laminated chip number with individual layer, thereby has the problem that expends man-hour.
In view of described problem, proposed to comprise the solid electrolytic capacitor of following assembly: the cuboid element, reeled by anode foils, Cathode Foil and the partition (separator) between anode foils and Cathode Foil, and then flatly turn to cuboid and form solid electrolyte by chemical polymerization; Electrode leading-out terminal is connected in element; And packaging body, encapsulate this cuboid element (for example, with reference to patent documentation 1).
Figure 12 (a) is the schematic diagram of solid electrolytic capacitor in the past, (b) is the schematic diagram of cuboid element included in the solid electrolytic capacitor shown in (a).
Solid electrolytic capacitor 101 comprises: the element 110 of cuboid, and reeled by anode foils, Cathode Foil and the partition between anode foils and Cathode Foil, and then flatly turn to cuboid and form solid electrolyte; Anode leading-out terminal 121 and cathode end 122 are connected in element 110; And packaging body 130, encapsulate the element 110 of this cuboid.Anode leading-out terminal 121 exposes and is connected with lead frame 140 from an end face 110a of element 110.Cathode end 122 exposes and is connected with lead frame 140 from the other end 110b of element 110.
Solid electrolytic capacitor according to patent documentation 1 record can satisfy lower back of the body requirement, and can suppress increases man-hour.And then, compare with tantalum capacitor in the past, need not to use the noble metals such as silver or tantalum, so can realize cost degradation.
[background technology document]
[patent documentation]
No. 101527203 specification of [patent documentation 1] People's Republic of China's Patent Application Publication
The utility model content
[utility model problem to be solved]
Yet, in the solid electrolytic capacitor of patent documentation 1 record, shown in Figure 12 (a), (b), the anode leading-out terminal 121 that is connected in anode foils and cathode end 122 that is connected in Cathode Foil are centered by volume core 110c (single-point chain line) and be configured in both sides (symmetry), so on the thickness direction of element 110, the position of anode leading-out terminal 121 (highly) has more different with the position (highly) of cathode end 122.But, in solid electrolytic capacitor 101, usually when forming packaging body 130 by resin cast component 110, must make the height of the lead frame 140 that exposes from packaging body 130 consistent.Therefore, in the solid electrolytic capacitor of patent documentation 1 record, by lead frame 140 is implemented bending machining jump 140a is set, at the link position of lead frame 140 with cathode end 122, the essential height of adjusting lead frame 140, thus there is the loaded down with trivial details problem of manufacturing process.
And if at lead frame 140 jump 140a is set, then this jump part also must by resin-sealed, therefore must need to shorten the width of electrode foil (for example anode foils).Therefore, the problem that exists the electrostatic capacitance of capacitor to be restricted.
For described problem, the utility model creator has proposed solid electrolytic capacitor as shown in figure 13.
Figure 13 (a) is the schematic diagram of an example of the solid electrolytic capacitor that proposes before the expression the utility model creator, (b) is the schematic diagram of cuboid element included in the solid electrolytic capacitor shown in (a).In addition, in Figure 13, to the formation suitable with formation shown in Figure 12, mark the symbol identical with Figure 12.
Solid electrolytic capacitor shown in Figure 13 101 ' in, different from solid electrolytic capacitor shown in Figure 12 101 is that anode leading-out terminal 121 and cathode end 122 both sides are configured in one-sided (downside among the figure) with respect to the volume core 110c of element 110.Therefore, can reduce the difference in height of anode leading-out terminal 121 and cathode end 122, and need not at lead frame 140 jump 140a (Figure 12) to be set.Its result can omit the bending machining of lead frame 140, so can solve loaded down with trivial detailsization of manufacturing process.And, owing to can eliminate the jump 140a (Figure 12) of lead frame 140, so can enlarge the width (area) of electrode foil.Therefore, the capacitance of capacitor is increased.
In addition, the utility model creator finds, if picture is configured in anode leading-out terminal 121 and cathode end 122 both sides as shown in Figure 13 with respect to the volume core 110c of element 110 one-sided, then can produce solid electrolytic capacitor 101 ' the new problem that increases of resistance value.For this problem, below describe.
Figure 14 be expression solid electrolytic capacitor 101 shown in Figure 13 ' in position relationship, and the figure of Cathode Foil 112 and the position relationship of cathode end 122 of anode foils 111 and anode leading-out terminal 121.
Solid electrolytic capacitor 101 ' (Figure 13) be by coiling anode foils 111, Cathode Foil 112, and partition (not shown) obtain.One end 112a of one end 111a of the long side direction of anode foils 111 and the long side direction of Cathode Foil 112 be element 110 ' the end of volume core 110c side.On the other hand, the other end 112b of the other end 111b of anode foils 111 and Cathode Foil 112 be positioned at element 110 ' the end of outer circumferential side.
As shown in figure 13, anode leading-out terminal 121 and cathode end 122 both sides are being configured in the one-sided situation with respect to the volume core 110c of element 110, anode leading-out terminal 121 is configured in the substantial middle of the long side direction of anode foils 111, and cathode end 122 is configured near the volume core side end 112a of Cathode Foil 112.
So, cathode end 122 is configured near the volume core side end 112a of Cathode Foil 112, leaves out and away the central authorities of the long side direction of Cathode Foil 112.Its result, solid electrolytic capacitor shown in Figure 13 101 ' in the problem that increases of the value of having a resistance (what is called is drawn resistance).
The utility model is the utility model of finishing in view of described problem, and its purpose is to provide a kind of loaded down with trivial detailsization that solves manufacturing process, electrostatic capacitance is increased and can suppresses to draw the solid electrolytic capacitor that resistance increases.
[technological means of dealing with problems]
The utility model is a kind of solid electrolytic capacitor, described solid electrolytic capacitor comprises: the cuboid element, will be by anode foils, Cathode Foil, and partition between anode foils and the Cathode Foil flat cuboid that turns to of winding element of reeling and forming, and form solid electrolyte; The anode leading-out terminal is included in interior the first plate-like portion that is connected with described anode foils of described cuboid element, reaches the first exposed division that exposes from an end face of described cuboid element; Cathode end is included in interior the second plate-like portion that is connected with described Cathode Foil of described cuboid element, reaches the second exposed division that exposes from the other end of described cuboid element; Packaging body encapsulates described cuboid element; And lead frame, be welded in each person of described the first exposed division and described the second exposed division, and expose from described packaging body.
In described solid electrolytic capacitor, described anode leading-out terminal and the sub-both sides of described cathode end are with respect to the volume core of described cuboid element and be configured in one-sided.
In described solid electrolytic capacitor, on the thickness direction of described cuboid element, described the second plate-like portion than described the first plate-like portion away from described volume core, described the first exposed division is thicker and side-prominent to described volume core than described the first plate-like portion, described the second exposed division is thicker and surpass described the first plate-like portion and side-prominent to described volume core than described the second plate-like portion, and described the second exposed division is high from the outstanding height of described the first plate-like portion from outstanding described the first exposed division of aspect ratio of described the second plate-like portion.
In aforesaid solid electrolytic capacitor, in the welding position of described lead frame and described the second exposed division, form to the side-prominent thrust of described the second exposed division; The described thrust of the Thickness Ratio of described the second exposed division is large from the height on the surface of described lead frame.
In aforesaid solid electrolytic capacitor, the described Cathode Foil in the situation that do not reel, the length L of the distance D of described second plate-like portion of the center of the long side direction of described Cathode Foil and described cathode end and the long side direction of described Cathode Foil satisfies the relation of 0≤D/L≤0.15; Wherein, D/L=0 refers to that center with the long side direction of described the second plate-like portion and described Cathode Foil joins or overlapping mode configures.
In aforesaid solid electrolytic capacitor, described the second plate-like portion is to join or overlapping mode configures with the center with the long side direction of described Cathode Foil.
In aforesaid solid electrolytic capacitor, also the opposition side to described volume core is outstanding on the thickness direction of described cuboid element for described the first exposed division.
[effect of utility model]
In solid electrolytic capacitor of the present utility model, the sub-both sides of anode leading-out terminal and cathode end are configured in one-sided with respect to the volume core of cuboid element, on the thickness direction of cuboid element, the second plate-like portion than the first plate-like portion away from the volume core.Therefore, in the utility model, need not with cathode end be configured in Cathode Foil volume core side end near, and cathode end can be configured in position (for example substantial middle) near the long side direction central authorities of Cathode Foil.Can suppress to draw thus the increase of resistance.
And, the sub-both sides of anode leading-out terminal and cathode end are with respect to the volume core of cuboid element and be configured in one-sided, on the thickness direction of cuboid element, the first exposed division is thicker and side-prominent to the volume core than the first plate-like portion, the second exposed division is thicker and surpass the first plate-like portion and side-prominent to the volume core than the second plate-like portion, and the second exposed division is high from the outstanding height of the first plate-like portion from outstanding aspect ratio the first exposed division of the second plate-like portion.Therefore, can reduce the jump of anode leading-out terminal and cathode end, and need not lead frame is carried out bending machining, so can solve loaded down with trivial detailsization of manufacturing process.And, owing to can eliminate the crooked jump of lead frame, so can enlarge the width (area) of electrode foil.Therefore, the capacitance of capacitor is increased.
Description of drawings
Fig. 1 (a) is the summary longitudinal section of solid electrolytic capacitor that schematically shows an execution mode of the application's utility model, (b) being the figure that schematically shows cuboid element included in the solid electrolytic capacitor shown in (a), (c) is the longitudinal section of the cuboid element shown in (b).
Fig. 2 (a) is the figure of the position relationship of the position relationship of anode foils in the expression solid electrolytic capacitor shown in Figure 1 and anode leading-out terminal and Cathode Foil and cathode end, (b) is the figure of length L that the long side direction of the distance D of the second plate-like portion of the center of long side direction of Cathode Foil of the present utility model and cathode end and Cathode Foil is described.
Fig. 3 (a) is the cutaway view that schematically shows anode foils, (b) is the cutaway view that schematically shows Cathode Foil.
Fig. 4 is the approximate three-dimensional map of the decomposition structure before the solid electrolyte of solid electrolytic capacitor that schematically shows an execution mode of the application's utility model forms.
Fig. 5 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Fig. 6 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Fig. 7 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Fig. 8 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Fig. 9 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Figure 10 (a)～(c) is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Figure 11 is the figure of manufacturing process that schematically shows the solid electrolytic capacitor of an execution mode of the present utility model.
Figure 12 (a) is the schematic diagram of solid electrolytic capacitor in the past, (b) is the schematic diagram of cuboid element included in the solid electrolytic capacitor shown in (a).
Figure 13 (a) is the schematic diagram of an example of the solid electrolytic capacitor that proposes before the expression the utility model creator, (b) is the schematic diagram of cuboid element included in the solid electrolytic capacitor shown in (a).
Figure 14 is the figure of the position relationship of the position relationship of anode foils in the expression solid electrolytic capacitor shown in Figure 13 and anode leading-out terminal and Cathode Foil and cathode end.
[explanation of symbol]
1 solid electrolytic capacitor
10 cuboid elements
10a, 10b end face
11 anode foils
12 Cathode Foil
13 partitions (solid electrolyte layer)
14 envelopes volume adhesive tape
21 anode leading-out terminals
22 cathode ends
30 packaging bodies
40 lead frames
Embodiment
In order more easily to understand above-mentioned purpose of the present utility model, feature and advantage, below use accompanying drawing to describe embodiment of the present utility model in detail.In order easily to understand the utility model, put down in writing in the following description detailed content, but the utility model also can implement beyond the following mode of implementing, and be not limited to following execution mode.And then accompanying drawing is not to make according to actual size, and only is skeleton diagram or schematic diagram, so the utility model is not subjected to the restriction of accompanying drawing.And in the accompanying drawings, in order to emphasize characteristic of the present utility model, clipped consists of and represents sometimes.
The solid electrolytic capacitor of an execution mode of the present utility model is described.
Fig. 1 (a) is the summary longitudinal section of solid electrolytic capacitor that schematically shows an execution mode of the application's utility model, (b) being the figure that schematically shows cuboid element included in the solid electrolytic capacitor shown in (a), (c) is the longitudinal section of the cuboid element shown in (b).
Fig. 2 (a) is the figure of the position relationship of the position relationship of anode foils in the expression solid electrolytic capacitor shown in Figure 1 and anode leading-out terminal and Cathode Foil and cathode end, (b) is the figure of length L that the long side direction of the distance D of the second plate-like portion of the center of long side direction of Cathode Foil of the present utility model and cathode end and Cathode Foil is described.
Fig. 3 (a) is the cutaway view that schematically shows anode foils, (b) is the cutaway view that schematically shows Cathode Foil.
Fig. 4 is the approximate three-dimensional map of the decomposition structure before the solid electrolyte of solid electrolytic capacitor that schematically shows an execution mode of the application's utility model forms.
As shown in Figure 4, solid electrolytic capacitor 1 comprises: cuboid element 10, will by anode foils 11, Cathode Foil 12 and be configured in anode foils 11 and Cathode Foil 12 between the partition 13 flat cuboid that turns to of winding element of reeling and forming, form solid electrolyte; Anode leading-out terminal 21 is connected in anode foils 11; Cathode end 22 is connected in Cathode Foil 12; And packaging body 30 (with reference to Fig. 1), by resin moulded cuboid element 10 is encapsulated.
In Fig. 4, the end of envelope volume adhesive tape 14 is freely, but in fact, the end of envelope volume adhesive tape 14 sticks to the side of cuboid element 10.And, also there is the method do not use envelope volume adhesive tape but to be adhered to by binding agent.As shown in Figure 4, anode foils 11 and Cathode Foil 12 integral body are banded.Between anode foils 11 and Cathode Foil 12, partition 13 is being set.Solid electrolyte as surface and partition 13 by each person of anode foils and Cathode Foil keep uses electroconductive polymer.As electroconductive polymer, such as enumerating poly-(3,4-rthylene dioxythiophene) etc.
Shown in Fig. 3 (a), anode foils 11 comprises the first valve metal layer 15 and is formed on the lip-deep dielectric oxidation epithelium 16 of the first valve metal layer 15.As valve metal herein, can enumerate the metals such as aluminium, tantalum, niobium, titanium.Use in the present embodiment aluminium.Dielectric oxidation epithelium 16 is to process the surface that is formed on through the first valve metal layer 15 of etch processes by changing into.In the present embodiment, the dielectric oxidation epithelium is aluminium oxide.
Shown in Fig. 3 (b), Cathode Foil 12 comprises second valve metal level 17 and is attached to the carbide particle layer 18 on the surface of second valve metal level 17.As valve metal herein, can enumerate the metals such as aluminium, tantalum, niobium, titanium.Use in the present embodiment aluminium.In addition, in Fig. 3 (a), (b), represent each person's of anode foils 11 and Cathode Foil 12 the interior lamination structure of paper tinsel, but in the figure beyond Fig. 3, do not represented the lamination structure in each electrode foil.And, as shown in Figure 2, the paper tinsel of Cathode Foil 12 long (length of the long side direction of Cathode Foil 12) is longer than the paper tinsel long (length of the long side direction of anode foils 11) of anode foils 11, and as described below, and Cathode Foil 12 is wound on the outside of wireline reel with respect to anode foils 11.
As shown in Figure 1, solid electrolytic capacitor 1 comprises anode leading-out terminal 21 and cathode end 22.Anode leading-out terminal 21 is connected in anode foils 11 (with reference to Fig. 4).Cathode end 22 is connected in Cathode Foil 12 (with reference to Fig. 4).
As shown in Figure 1, anode leading-out terminal 21 the first exposed division 21a of being included in the first plate-like portion 21b of being connected with anode foils 11 in the cuboid element 10 and exposing from an end face 10a of cuboid element 10.The second exposed division 22a that cathode end 22 is included in the second plate-like portion 22b of being connected with Cathode Foil 12 in the cuboid element 10 and exposes from the other end 10b of cuboid element 10. End face 10a, 10b are the faces vertical with coiling axis anode foils 11 and Cathode Foil 12 (volume core 10c) cuboid element 10.In other words, be the face vertical with the Width of anode foils 11 and Cathode Foil 12.And the face with wireline reel line parallel anode foils 11 and Cathode Foil 12 cuboid element 10 is the side of cuboid element 10.In addition, volume core 10c comprises and is positioned at the partition 13 in week, and by winding element 19 (Fig. 6) being implemented press process, and as Fig. 1 (c) shown in when from the axis direction observation of rolling up core 10c the long side direction at end face 10b extend.
The first exposed division 21a of anode leading-out terminal 21 and the second exposed division 22a of cathode end 22 comprise non-valve metal.The first plate-like portion 21b of anode leading-out terminal and the second plate-like portion 22b of cathode end comprise valve metal.In addition, the second exposed division 22a of the first exposed division 21a of anode leading-out terminal 21 and cathode end 22 also can comprise valve metal.Anode leading-out terminal 21 and cathode end 22 both sides are configured in one-sided with respect to the volume core 10c of cuboid element 10.Thus, can reduce cuboid element 10 anode leading-out terminal 21 outward and the difference in height of cathode end 22.
And, on the thickness direction of cuboid element 10, the second plate-like portion 22b of cathode end 22 than the first plate-like portion 21b of anode leading-out terminal 21 away from volume core 10c.Between the second plate-like portion 22b and the first plate-like portion 21b, for example configuring solid electrolyte layer (a slice partition 13) and Cathode Foil 12 (a slice Cathode Foil 12).In addition, configurable solid electrolyte layer (a slice partition 13) and anode foils 11 (a slice anode foils 11) also can only configure solid electrolyte layer (a slice partition 13) between the second plate-like portion 22b and the first plate-like portion 21b.So, the second plate-like portion 22b and the first plate-like portion 21b configure across the interval on the thickness direction of cuboid element 10, directly contact and insulating.
And then shown in Fig. 1 (a), (b), the second plate-like portion 22b overlaps at the thickness direction of cuboid element 10 with at least a portion of the first plate-like portion 21b.Can be the second plate-like portion 22b and the first plate-like portion 21b half overlaps at least, also can overlapping more than 2/3 for the second plate-like portion 22b and the first plate-like portion 21b.In addition, in the present embodiment, two terminals have same widths, but in the different situation of the width of two terminals, and the coincidence degree of two terminals is to calculate take the shorter terminal of width as benchmark.And volume core 10c overlaps at the thickness direction of cuboid element 10 with the second plate-like portion 22b and the first plate-like portion 21b.On the long side direction of end face 10b (or end face 10a), the width of the Width of the first plate-like portion 21b and the second plate-like portion 22b volume core 10c is narrow.
The first exposed division 21a is thicker and side-prominent to volume core 10c than the first plate-like portion 21b.In addition, in the present embodiment, the first exposed division 21a is also outstanding to the opposition side of volume core 10c.And the second exposed division 22a is thicker and surpass the first plate-like portion 21b and side-prominent to volume core 10c than the second plate-like portion 22b.The second exposed division 22a is from the outstanding height H of the second plate-like portion 22b
2Ratio the first exposed division 21a is from the outstanding height H of the first plate-like portion 21b
1High.The first exposed division 21a is thicker and side-prominent to volume core 10c than the first plate-like portion 21b, so H
1Be not 0.In the present embodiment, shown in Fig. 1 (a), the surperficial 22c of the surperficial 21c of the volume core 10c side (upside among the figure) of the first exposed division 21a and the volume core 10c side (upside among the figure) of the second exposed division 22a is in the same plane in fact.In other words, surperficial 21c and surperficial 22c are positioned in fact equal height on the thickness direction (above-below direction among the figure) of cuboid element 10.Welding lead frame 40 on each person of surperficial 21c, 22c.Because surperficial 21c and surperficial 22c are positioned in fact equal height, so the welding of carrying out surperficial 21c, 22c and lead frame 40 under the state of jump (with reference to Figure 12) can be set in lead frame 40.In the present embodiment, the lead frame 40 that is positioned at packaging body 30 is tabular.That is to say, the lead frame 40 that is positioned at packaging body 30 is not implemented bending machining.
Shown in Fig. 1 (a), lead frame 40 in the outer setting of cuboid element 10.Lead frame 40 is embedded in the packaging body 30.And, connecting the first exposed division 21a of anode leading-out terminal 21 or the second exposed division 22a of cathode end 22 on each lead frame 40.In this consisted of, when making solid electrolytic capacitor 1, a lead frame 40 was connecting a plurality of cuboid elements 10 (with reference to Fig. 9, Figure 11).
The lead frame 40 that exposes in the packaging body 30 along the surface of packaging body 30 towards the lower lateral bend of Fig. 1.And, anode leading-out terminal 21 and cathode end 22 downsides than the more close Fig. 1 of volume core 10c.That is to say, anode leading-out terminal 21 and cathode end 22 are positioned at one-sided with respect to volume core 10c, and lead frame 40 is crooked towards the same side.
In the present embodiment, the first exposed division 21a and the second exposed division 22a are flat.Be that columned situation is compared with this part, when making the first exposed division 21a and the second exposed division 22a and the lead-in wire (for example lead frame 40) of cuboid element 10 outsides become the face contact when being connected, so can obtain larger contact area, thereby can guarantee to be electrically connected.In the utility model, as long as the first exposed division 21a and the second exposed division 22a are thicker than the first plate-like portion 21b and the second plate-like portion 22b, the shape of the first exposed division 21a and the second exposed division 22a is not limited to this example, for example also can be for than thick tabular of the first plate-like portion 21b and the second plate-like portion 22b.The surperficial 22c of the surperficial 21c of the first exposed division 21a and the second exposed division 22a can be the plane, also can be curved surface, can also comprise plane and curved surface.
As shown in Figure 1, by packaging body 30 encapsulation (sealing) cuboid elements 10 and the lead frame 40 that is connected with cuboid element 10, thereby guarantee insulation with the outside.As packaging body 30, such as enumerating epoxy resin or liquid crystal polymer etc.And, when forming packaging body 30, use common molded technique.In packaging body 30, lead frame 40 has tabular and contacts with each person's face of anode leading-out terminal 21 and cathode end 22.In packaging body 30, lead frame 40 is not implemented bending machining.Specifically, end face 10a, the 10b of cuboid element 10 and and the surface of the packaging body 30 of end face 10a, 10b subtend between, lead frame 40 is not implemented bending machining, lead frame 40 is parallel to axis (the single-point chain line among Fig. 1) direction of volume core 10c and extends.Therefore, can shorten cuboid element 10 end face 10a, 10b and and the surface of the packaging body 30 of end face 10a, 10b subtend between distance.Its result can enlarge the width of anode foils 11, thereby can increase electrostatic capacitance.
In the present embodiment, by cuboid element 10 being set as suitable thickness (for example 1.8mm), and not restricted by the thickness of cuboid element, can realize to tackle the chip type solid electrolytic capacitor of lower back of the body requirement.Therefore, according to the solid electrolytic capacitor 1 in the present embodiment, the shared space of thickness is less, and can satisfy requirement to the low back of the body of electronic equipment with higher level.
And in the present embodiment, in the situation that do not reel anode foils 11 and Cathode Foil 12, anode leading-out terminal 21 is installed in the center C with the long side direction of anode foils 11
1Overlapping position.And cathode end 22 is installed in the center C with the long side direction of Cathode Foil 12
2Overlapping position.Thus, can suppress to draw the increase of resistance.Its result can suppress the increase of the resistance value of solid electrolytic capacitor 1.In addition, each electrode leading- out terminal 21,22 pairs of each electrode foils 11,12 installation are for example undertaken by riveting method.
So, in the utility model, preferably shown in Fig. 2 (a), each electrode leading- out terminal 21,22 is configured in the center C of each electrode foil 11,12 long side direction
1, C
2Near.About cathode end 22, in the utility model, as shown in Figure 1, the second plate-like portion 22b of cathode end 22 be configured on the thickness direction of cuboid element 10 than the first plate-like portion 21b of anode leading-out terminal 21 position away from volume core 10c, so can shown in Fig. 2 (a), cathode end 22 be configured in the center C of the long side direction of Cathode Foil 12
2Near.
Specifically, shown in Fig. 2 (b), in the situation that the Cathode Foil 12 of not reeling, the center C of the long side direction of Cathode Foil 12
2With the distance D of the second plate-like portion 22b (center of the second plate-like portion 22b on the paper tinsel long side direction) of cathode end 22, preferably satisfy the relation of 0≤D/L≤0.15 with the length L of the long side direction of Cathode Foil 12.In addition, D/L=0 refer to the second plate-like portion 22b with the center C of the long side direction of Cathode Foil 12
2Join or overlapping mode configures.But establishment is drawn the increase of resistance by the relation that satisfies 0≤D/L≤0.15.And then, in the utility model, be more preferred from shown in Fig. 2 (a), cathode end 22 with the center C of the long side direction of Cathode Foil 12
2Overlapping mode configures.And, and then preferably cathode end 22 with the center C of the long side direction of the center of the Width of cathode end 22 and Cathode Foil 12
2The mode that roughly overlaps configures.Can more effectively suppress to draw the increase of resistance.Anode foils 11 and anode leading-out terminal 21 are too.
The manufacture method of the solid electrolytic capacitor in the present embodiment then, is described with reference to Fig. 5～Figure 11.
＜step S1 〉
As shown in Figure 5, prepare to be become by severing anode foils 11 and the Cathode Foil 12 of certain width.Specifically, anode foils 11 is band shape with Cathode Foil 12.Anode foils 11 and Cathode Foil 12 are for as mentioned above, so description thereof is omitted herein.
＜step S2 〉
As shown in Figure 5, each electrode leading- out terminal 21,22 is bonded on anode foils 11 and the Cathode Foil 12.
Specifically, implement anode leading-out terminal 21 is bonded on operation (first engages operation) on the anode foils 11, and cathode end 22 is bonded on operation (second engages operation) on the Cathode Foil 12.In addition, first engage operation engages operation with second order (successively) and be not particularly limited.
Anode leading-out terminal 21 comprises the first plate-like portion 21b, the first exposed division 21a, reaches the first cylindrical portion 21e in manufacture process.
The first plate-like portion 21b is positioned at an end of anode leading-out terminal 21.The first plate-like portion 21b overlaps and is bonded on the anode foils 11 with anode foils 11.
The first exposed division 21a and the first plate-like portion 21b are continuous.As shown in Figure 5, when the first plate-like portion 21b is bonded on the anode foils 11, the first exposed division 21a more gives prominence in the outside (downside among the figure) of the short side direction of anode paper tinsel 11 (above-below direction among the figure) than one side (limit of downside among the figure) of the long side direction (left and right directions among the figure) of anode foils 11, and does not overlap with anode foils 11.
The first cylindrical portion 21e is from the first exposed division 21a and the extended part of opposition side (downside among the figure) the continuous side of the first plate-like portion 21b (upside the figure).Therefore, when the first plate-like portion 21b engaged with anode foils 11, the first exposed division 21a and the first cylindrical portion 21e were outstanding from one side (limit of downside the figure) of the long side direction of anode foils 11.
The second exposed division 22a is positioned at an end of cathode end 22.As shown in Figure 5, when the second plate-like portion 22b is bonded on the Cathode Foil 12, the second exposed division 22a is more outstanding to the outside (upside among the figure) of the short side direction (above-below direction among the figure) of Cathode Foil 12 than one side (limit of upside among the figure) of the long side direction (left and right directions among the figure) of Cathode Foil 12, and does not overlap with Cathode Foil 12.
The second plate-like portion 22b and the second exposed division 22a are continuous.The second plate-like portion 22b overlaps and is bonded on the Cathode Foil 12 with Cathode Foil 12.
Connecting portion 22d and the second plate-like portion 22b are continuous.As shown in Figure 5, when the second plate-like portion 22b is bonded on the Cathode Foil 12, connecting portion 22d is more outstanding to the outside (downside among the figure) of the short side direction (above-below direction among the figure) of Cathode Foil 12 than the another side (limit of downside among the figure) of the long side direction (left and right directions among the figure) of anode foils 11, and does not overlap with Cathode Foil 12.
The second cylindrical portion 22e and connecting portion 22d are continuous.That is to say, connecting portion 22d and the second cylindrical portion 22e are when the second plate-like portion 22b is bonded on the Cathode Foil 12, from the second plate-like portion 22b surpass Cathode Foil 12 long side direction another side (limit of downside the figure) and to the extended part in the outside (downside among the figure) of the short side direction of Cathode Foil 12.
In step S2, the second plate-like portion 22b is bonded on the Cathode Foil 12, and excision from the second plate-like portion 22b surpass Cathode Foil 12 long side direction another side (limit of downside the figure) and to the extended part in the outside (downside among the figure) (connecting portion 22d and the second cylindrical portion 22e) (the second excision operation) of the short side direction of Cathode Foil 12.In the present embodiment, anode leading-out terminal 21 on the thickness direction of cuboid element 10 is shorter with the distance of cathode end 22, and the first exposed division 21a of anode leading-out terminal 21 is thicker than the first plate-like portion 21b, so in order to prevent the short circuit of anode leading-out terminal 21 and cathode end 22, carefully the connecting portion 22d of removal cathode end 22.Therefore, as shown in Figure 1, in cuboid element 10, cathode end 22 is outstanding from the end face 10b of cuboid element 10, but substantially not outstanding from the end face 10a of cuboid element 10.In the utility model, preferably cathode end 22 (the second plate-like portion 22b) is not outstanding from the end face 10a of cuboid element 10.But, from preventing the viewpoint of short circuit, allow outstanding slight amount (inevitable error when for example making).In addition, each electrode leading-out terminal 21,22 with electrode foil 11,12 engage by riveted joint or ultrasonic bonding etc. and undertaken.
＜step S3 〉
As shown in Figure 6, by coiling anode foils 11 and Cathode Foil 12 and be configured in anode foils 11 and Cathode Foil 12 between partition 13 and cut off with length-specific and to form cylinder, roll up adhesive tape 14 by envelope the end be fixed on cylindrical side.Herein, Cathode Foil 12 is wound on the outside of wireline reel with respect to anode foils 11, and Cathode Foil 12 is positioned at cylindrical most peripheral.According to this formation, by covering the dielectric oxidation epithelium 16 (making Cathode Foil 12 near dielectric oxidation epithelium 16) that is formed on the anode foils 11 by the lower Cathode Foil of resistance, and ESR (Equivalent Series Resistance, equivalent series resistance) is descended.And Cathode Foil 12 is than anode foils 11 softnesses, so by with the outside of Cathode Foil 12 configure volumes around anode foils 11, can alleviate moulding resin to the stress of element.In addition, as the method that the end is fixed on cylindrical side, the end is fixed on the method for cylindrical side except using envelope volume adhesive tape 14, for example also has the method for not using envelope volume adhesive tape and being adhered to by binding agent.Form thus winding element 19.At this moment, the second plate-like portion 22b of the first plate-like portion 21b of anode leading-out terminal 21 and cathode end 22 is positioned at the inside of winding element 19.And the first exposed division 21a of anode leading-out terminal 21 and the first cylindrical portion 21e expose from an end of winding element 19.And the second exposed division 22a of cathode end 22 exposes from the other end of winding element 19.Partition 13 for example comprises natural fiber (cellulose) or chemical fibre.The natural fiber or the chemical fibre that can be used as partition 13 are not particularly limited.As chemical fibre, can use the synthetic fibers such as Fypro, acrylic fibers, vinylon fiber, polyimide fiber, nylon fiber.
＜step S4 〉
As shown in Figure 7, winding element 19 is deformed into cuboid element 10.Specifically, winding element 19 is fixed on (not shown) on the particular jig, applies load and make its distortion, form thus the cuboid element 10 of specific dimensions.Then, cuboid element 10 is fixed on the bar.And then, in the present embodiment, as the first exposed division 21a when being cylindric, columned the first exposed division 21a pressurization of antianode leading-out terminal 21 and make it be configured as flat.
＜step S5 〉
＜step S6 〉
Between the anode foils 11 of above-mentioned cuboid element and Cathode Foil 12, form solid electrolyte layer 13.In the present embodiment, solid electrolyte is electroconductive polymer, and is by forming as the 3,4-rthylene dioxythiophene of monomer with as the chemical polymerization of the p-methyl benzenesulfonic acid molysite of oxidant.Specifically, at first, monomer solution for example becomes 25wt% concentration by the ethanol dilution.Cuboid element 10 is immersed in the monomer solution, then, removes ethanol as solvent, only residual monomer by heat drying.Preferably 40 ℃～60 ℃ of the temperature of heat drying for example can be made as 50 ℃.If temperature surpasses 60 ℃, then cause rapid evaporation near the boiling point of ethanol, monomer can not remain in cuboid element 10 inside equably.And if be below 40 ℃, then evaporation can expend time in.Though depend on the volume of cuboid element 10 drying time, in cuboid element 10 about preferably 10 minutes～20 minutes.Oxidant is contained be immersed in residual the cuboid element 10 of monomer, form 3,4-rthylene dioxythiophene.The impregnation of above-mentioned oxidant is to contain by decompression impregnation method to be immersed in the cuboid element 10.As oxidant, use the butanol solution of the 55wt% of p-methyl benzenesulfonic acid molysite, cuboid element 10 dippings and decompression are contained be immersed in the oxidant.Then, make cuboid element 10 be warmed up to 180 ℃ from 30 ℃ interimly, can form poly-(3,4-rthylene dioxythiophene) as electroconductive polymer by chemical polymerization.In addition, about the electroconductive polymer that forms in the cuboid element, not only can form by the method for in the cuboid element, carrying out chemical polymerization, also can pre-synthesis electroconductive polymer and be dispersed in the solvent, again the cuboid element is immersed in the solution of gained and carries out drying and form, and can independent or a plurality of use polyanilines, the well-known electroconductive polymer such as polypyrrole, polythiophene, to replace gathering (3,4-rthylene dioxythiophene).In addition, in the present embodiment, the first exposed division 21a is side-prominent to the volume core on the thickness direction of cuboid element 10, and the opposition side to volume core side is outstanding, so when during impregnation cuboid element 10, suppressing the first exposed division 21a that stretch such as monomer, oxidant in order to form solid electrolyte.
＜step S7 〉
As shown in Figure 8, keep the first exposed division 21a of anode leading-out terminal 21, excision is from the first exposed division 21a and the extended part of the opposition side continuous side of the first plate-like portion 21b (the first cylindrical portion 21e) (the first excision operation).
Next, as shown in Figure 9, make each electrode leading- out terminal 21,22 of cuboid element 10 be connected in lead frame 40.Lead frame 40 becomes bringing-out.As method of attachment, such as using the method for being undertaken by laser welding or resistance welded etc. or by the method for the bonding connections such as silver slurry.If consider manufacturing cost and contact resistance, then preferably utilize the method for attachment of the intermetallic combinations such as laser welding or resistance welded.In stack-up type solid electrolytic capacitor in the past, usually after anode foils forms solid electrolyte layer, use coating silver slurry, and then in the engaging of the cuboid element of coating and lead frame, using the silver slurry, can become like this one of reason of cost rising, but in the utility model, can be by intermetallics such as laser welding or resistance welded in conjunction with connecting, so need not the noble metals such as silver, can suppress cost.
In addition, use Figure 10 that concrete method of attachment is described.
Shown in Figure 10 (a), make top tapered pin (not shown) run through lead frame 40, thereby form jut 40a at lead frame 40.The periphery of the pin when jut 40a connects along pin and forming.Jut 40a forms towards the mode of anode leading-out terminal 21 and cathode end 22 when being connected with anode leading-out terminal 21 and cathode end 22.The number of jut 40a is not particularly limited.The Thickness Ratio jut 40a of the second exposed division 22a is large from the height on the surface of lead frame 40.And the Thickness Ratio jut 40a of the first exposed division 21a is large from the height on the surface of lead frame 40.Can stably weld thus.And, can improve weld strength or reduce welding resistance.
Then, shown in Figure 10 (b), with anode leading-out terminal 21 and cathode end 22 modes that contact with the jut 40a of lead frame 40 cuboid element 10 is configured on the lead frame 40.
Then, shown in Figure 10 (c), by methods such as resistance welded anode leading-out terminal 21 and cathode end 22 are bonded on the lead frame 40.For example, in the situation that anode leading-out terminal 21 and cathode end 22 comprise that aluminium, lead frame 40 comprise copper, anode leading-out terminal 21 and cathode end 22 meltings during welding.In anode leading-out terminal 21 outside cuboid element 10 and the larger situation of the thickness difference of cathode end 22, anode leading-out terminal 21 is large with the poor change of degree of the melting of cathode end 22, thereby the well anxiety of molding of the precision of being difficult to is arranged.Therefore, preferably cuboid element 10 anode leading-out terminal 21 outward is as far as possible little with the thickness difference of cathode end 22.
In the present embodiment, the second exposed division 22a is from the second plate-like portion 22b to the side-prominent height H of volume core 10c
2Ratio the first exposed division 21a is from the first plate-like portion 21b to the side-prominent height H of volume core 10c
1Height, but the first exposed division 21a is also outstanding to the opposition side of volume core 10c.Thus, the thickness difference of the first exposed division 21a and the second exposed division 22a reduces.
＜step S8 〉
Such as Figure 11 and shown in Figure 1, by being carried out molded packages, the cuboid element 10 that is connected in this lead frame 40 forms packaging body 30, the terminal of the lead frame 40 that then is shaped, chip type solid electrolytic capacitor 1 is finished.
As mentioned above, the manufacture method of the solid electrolytic capacitor 10 in the present embodiment comprises that first engages operation, the first excision operation, the second joint operation and the second excision operation, can make well solid electrolytic capacitor 10 by simple method precision.And, because the second exposed division 21a of cathode end 22 is thicker than the second plate-like portion 21b, so cathode end 22 becomes easy with respect to the location of Cathode Foil 12 on the short side direction (Width) of Cathode Foil 12.And then, because the second exposed division 22a of cathode end 22 is thicker than the second plate-like portion 22b, so the surperficial 22c of the second exposed division 22a is difficult for producing hydrops in the forming process of solid electrolyte layer 13, the thickness that is formed on the solid electrolyte on the surperficial 22c of the second exposed division 22a becomes more even, so easily remove the solid electrolyte of the surperficial 22c of the second exposed division 22a.
Above-mentioned execution mode is better execution mode of the present utility model, but does not limit the utility model.The utility model those skilled in the art can use described method and technology contents that the utility model is carried out various changes in scope of the present utility model, or changes to equal execution mode.Therefore, only otherwise break away from content of the present utility model, then to correspondingly change based on execution mode of the present utility model, displacement and the modification of equivalent be also included within the scope of the present utility model.
＜embodiment 〉
As embodiment, make the solid electrolytic capacitor 1 shown in the above-mentioned present embodiment (2.5V, 220 μ F) (Fig. 1).The size of the package of this solid electrolytic capacitor 1 is 7.3mm * 4.3mm * 2.8mm.As lead frame 40, using the surface is the copper frame material of 100 μ m through the thickness of Nickel Plating Treatment.In addition, during fabrication, with the center C of the long side direction of the first plate-like portion 21b and anode foils 11
1Overlapping mode is bonded on anode leading-out terminal 21 on the anode foils 11, with the center C of the long side direction of the second plate-like portion 22b and Cathode Foil 12
2Overlapping mode is bonded on cathode end 22 on the Cathode Foil 12.And, at connecting lead wire frame 40 and anode leading-out terminal 21 (aluminum positive plate) and cathode end 22 (aluminum cathode plate) before, make pin run through in the lead frame 40 link position with anode leading-out terminal 21 and cathode end 22, form jut 40a at described link position thus.As pin, use the top to be the pin of the φ 0.26mm of quadrangular pyramid shape.The height of thrust 40a is 0.3mm approximately.Use the frequency conversion type resistance welder that lead frame 40 is connected with anode leading-out terminal 21 and cathode end 22.
＜comparative example 〉
Make solid electrolytic capacitor 101 shown in Figure 13 (2.5V, 220 μ F) and replace the solid electrolytic capacitor 1 among the embodiment, in addition, similarly compare example with embodiment.The size of the package of this solid electrolytic capacitor 101 and embodiment are similarly 7.3mm * 4.3mm * 2.8mm.
Compare for the solid electrolytic capacitor 1 of the embodiment performance with the solid electrolytic capacitor 101 of comparative example.To the results are shown in table 1.In addition, Tan δ represents the loss tangent of an angle.LC (Leakage Current) represents leakage current.ESR represents equivalent series resistance.
[table 1]
| ? | Electrostatic capacitance (μ F) | Tanδ | LC(μA) | ESR(mΩ) |
| Embodiment | 225 | 0.009 | 35 | 8.4 |
| Comparative example | 214 | 0.009 | 151 | 10.3 |
As shown in table 1, compare with the solid electrolytic capacitor 101 of comparative example, in the solid electrolytic capacitor 1 of embodiment, can confirm that ESR decreases, thereby clearly embody validity of the present utility model.
Claims (5)
1. solid electrolytic capacitor, described solid electrolytic capacitor comprises:
The cuboid element, will by anode foils, Cathode Foil, and partition between anode foils and Cathode Foil to reel that the winding element that forms flattens be cuboid, and form solid electrolyte;
The anode leading-out terminal, the first exposed division that is included in the first plate-like portion of being connected with described anode foils in the described cuboid element and exposes from an end face of described cuboid element;
Cathode end is included in the second plate-like portion that is connected with described Cathode Foil in the described cuboid element and the second exposed division that exposes from the other end of described cuboid element;
Packaging body encapsulates described cuboid element; And
Lead frame is welded in each person of described the first exposed division and described the second exposed division, and exposes from described packaging body;
Described anode leading-out terminal and the sub-both sides of described cathode end are with respect to the volume core of described cuboid element and be disposed at one-sided;
On the thickness direction of described cuboid element, described the second plate-like portion than described the first plate-like portion away from described volume core, described the first exposed division is thicker and side-prominent to described volume core than described the first plate-like portion, described the second exposed division is thicker and surpass described the first plate-like portion and side-prominent to described volume core than described the second plate-like portion, and described the second exposed division is high from the outstanding height of described the first plate-like portion from outstanding described the first exposed division of aspect ratio of described the second plate-like portion.
2. solid electrolytic capacitor according to claim 1, wherein
In the welding position of described lead frame and described the second exposed division, form to the side-prominent thrust of described the second exposed division;
The described thrust of the Thickness Ratio of described the second exposed division is large from the height on the surface of described lead frame.
3. solid electrolytic capacitor according to claim 1 and 2, wherein
The described Cathode Foil in the situation that do not reel, the length L of the distance D of described second plate-like portion of the center of the long side direction of described Cathode Foil and described cathode end and the long side direction of described Cathode Foil satisfies the relation of 0≤D/L≤0.15;
Wherein, D/L=0 refers to that center with the long side direction of described the second plate-like portion and described Cathode Foil joins or overlapping mode configures.
4. solid electrolytic capacitor according to claim 3, wherein
Described the second plate-like portion is to join or overlapping mode configures with the center with the long side direction of described Cathode Foil.
5. each described solid electrolytic capacitor in 4 according to claim 1, wherein
Also the opposition side to described volume core is outstanding on the thickness direction of described cuboid element for described the first exposed division.
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| CN 201220435862 CN202905476U (en) | 2012-08-29 | 2012-08-29 | Solid electrolytic condenser |
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| CN 201220435862 CN202905476U (en) | 2012-08-29 | 2012-08-29 | Solid electrolytic condenser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632848A (en) * | 2012-08-29 | 2014-03-12 | 尼吉康株式会社 | Solid electrolytic capacitor |
| CN106783223A (en) * | 2016-12-30 | 2017-05-31 | 胡英 | A kind of convoluted all-solid-state supercapacitor and preparation method |
| CN110168684A (en) * | 2016-12-27 | 2019-08-23 | Tdk电子股份有限公司 | The method of mixed polymer aluminium electrolutic capacitor and manufacture capacitor |
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2012
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632848A (en) * | 2012-08-29 | 2014-03-12 | 尼吉康株式会社 | Solid electrolytic capacitor |
| CN103632848B (en) * | 2012-08-29 | 2016-08-03 | 尼吉康株式会社 | Solid electrolytic capacitor |
| CN110168684A (en) * | 2016-12-27 | 2019-08-23 | Tdk电子股份有限公司 | The method of mixed polymer aluminium electrolutic capacitor and manufacture capacitor |
| US11158464B2 (en) | 2016-12-27 | 2021-10-26 | Tdk Electronics Ag | Hybrid polymer aluminum electrolytic capacitor and method of manufacturing a capacitor |
| US11823847B2 (en) | 2016-12-27 | 2023-11-21 | Tdk Electronics Ag | Hybrid polymer aluminum electrolytic capacitor and method of manufacturing a capacitor |
| US11935707B2 (en) | 2016-12-27 | 2024-03-19 | Tdk Electronics Ag | Hybrid polymer aluminum electrolytic capacitor and method of manufacturing a capacitor |
| US11942280B2 (en) | 2016-12-27 | 2024-03-26 | Tdk Electronics Ag | Hybrid polymer aluminum electrolytic capacitor and method of manufacturing a capacitor |
| CN106783223A (en) * | 2016-12-30 | 2017-05-31 | 胡英 | A kind of convoluted all-solid-state supercapacitor and preparation method |
| CN106783223B (en) * | 2016-12-30 | 2019-01-22 | 胡英 | A kind of winding-type all-solid-state supercapacitor and preparation method |
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