CN103680980B - A kind of 400V electrolysis condenser and production technology thereof - Google Patents
A kind of 400V electrolysis condenser and production technology thereof Download PDFInfo
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Abstract
The invention discloses a kind of 400V electrolysis condenser and production technology thereof, including shell, fuse, sealing-plug, negative wire and positive wire；Fuse includes Cathode Foil and anode foils, and fuse also includes insulation electrolytic paper；Insulation electrolytic paper is added with electrolyte；Ethylene glycol 40%-50%, diethylene glycol 10%-20%, 2,2'-ethylenedioxybis(ethanol). 10%-20%, glycerol 10%-20%, gamma-hydroxybutyric acid lactone 10%-20%, SA 1%-10%, SA ammonium 1%-10%, ortho-nitroanisole 0.1%-0.9%, p nitrobenzyl alcohol 0.1%-0.9%, benzene 0.1%-1%, polyvinyl alcohol 0.1%-1%, citric acid 0%-0.5%.The electrolysis condenser temperature tolerance of the present invention is good, and the life-span is long, and when 105 DEG C, load life reaches 10000-15000 hour.
Description
Technical field
The present invention relates to a kind of electrochemical capacitor, in particular a kind of 400V electrolysis condenser and production technology thereof.
Background technology
Volume (size) size of electrochemical capacitor is a key factor of restriction electrolysis condenser performance, how to increase the size of electrochemical capacitor, to improve the temperature tolerance of electrochemical capacitor and to increase the life-span of electrochemical capacitor, is the research direction of existing technical staff.Electrochemical capacitor of the prior art, when 105 DEG C (or more than), load life is generally 1000-2000 hour, these electric capacity is for aspect poor durability such as tunnel (highway) illumination, seabed irradiation, court illumination, advertisement irradiations, need often to change, but due to the complexity of using area, change relatively big, relatively costly.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
It is an object of the invention to provide a kind of 400V electrolysis condenser and production technology thereof, it is intended to solve the electrochemical capacitor of the prior art technical problem that load life is shorter when 105 DEG C (or more than).
Technical scheme is as follows: a kind of 400V electrolysis condenser, wherein, including shell, fuse, sealing-plug, negative wire and positive wire；Described shell is arranged to single-ended closed barrel-shaped, and described fuse is placed in enclosure, and sealing-plug is arranged on the open end of shell, negative wire and positive wire and is connected with fuse respectively, all stretches out from the opening of shell through sealing-plug；
Described fuse includes the Cathode Foil being connected with negative wire winding and the anode foils being connected with positive wire winding, and described fuse also includes the insulation electrolytic paper of winding parcel Cathode Foil and anode foils respectively, and described insulation electrolytic paper separates Cathode Foil and anode foils；Described insulation electrolytic paper is added with electrolyte；
The specified oxide-film proof voltage of described anode foils is 630V；
The voltage of described Cathode Foil is 1.5V-5V；
Described electrolysis condenser capacity is 4.7 μ F-47 μ F；
Described insulation electrolytic paper adopts compound two-layer insulation electrolytic paper, and density is 70g/m3, and thickness is 70 μm；
Described negative wire and positive wire all adopt high temperature chemical conversion lead-in wire；
Described sealing-plug adopts 100%IIR micelle material seal plug；
Described enclosure bottom diameter is 10-22mm, and height is 20-35mm；
The composition of described electrolyte includes: ethylene glycol 40%-50%, diethylene glycol 10%-20%, 2,2'-ethylenedioxybis(ethanol). 10%-20%, glycerol 10%-20%, gamma-hydroxybutyric acid lactone 10%-20%, decanedioic acid 1%-10%, ammonium sebacate 1%-10%, ortho-nitroanisole 0.1%-0.9%, p nitrobenzyl alcohol 0.1%-0.9%, benzene 0.1%-1%, polyvinyl alcohol 0.1%-1%, citric acid 0%-0.5%.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 4.7 μ F, and described enclosure bottom diameter is 10mm, and height is 20mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 6.8 μ F, and described enclosure bottom diameter is 13mm, and height is 20mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 8.2 μ F, and described enclosure bottom diameter is 13mm, and height is 21mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 10 μ F, and described enclosure bottom diameter is 13mm, and height is 21mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 22 μ F, and described enclosure bottom diameter is 16mm, and height is 25mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 33 μ F, and described enclosure bottom diameter is 18mm, and height is 32mm.
Described 400V electrolysis condenser, wherein, described 400V electrolysis condenser capacity is 47 μ F, and described enclosure bottom diameter is 22mm, and height is 35mm.
The production technology of described 400V electrolysis condenser, wherein, comprises the following steps:
A. make Cathode Foil and anode foils: galvano-cautery Cathode Foil and anode foils, after galvano-cautery, aoxidize Cathode Foil and anode foils, form oxide-film in Cathode Foil and anode foils surface；
B. cutting Cathode Foil, anode foils and insulation electrolytic paper, is connected lead-in wire with Cathode Foil and anode foils respectively, forms negative wire and positive wire, by insulation electrolytic paper and Cathode Foil, anode foils winding；
C. add electrolyte, electrolyte is impregnated in insulation electrolytic paper；
D. last assembling, crimping, charging, burn-in test and parameter detecting are carried out.
Beneficial effects of the present invention: the present invention carries out reasonable disposition by the characteristic of all parts to electrolysis condenser, and coordinate the electrolyte of the present invention, achieve the overall volume increasing 400V electrolysis condenser, reach under the premise ensureing electrochemical capacitor normal operation, improve its temperature tolerance and extend the practical application effect in its life-span, the electrolysis condenser of the present invention is normal operation when 105 DEG C, load life reaches 10000-15000 hour, is far longer than the load life of the electrolysis condenser of prior art.
Accompanying drawing explanation
Fig. 1 is the structural representation of 400V electrolysis condenser in the present invention.
Fig. 2 is the structural representation of 400V electrolysis condenser fuse in the present invention.
Fig. 3 is the test tables of data trrellis diagram of 400V electrolysis condenser in the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
The invention discloses a kind of 400V electrolysis condenser, as it is shown in figure 1, include shell 100, fuse 200, sealing-plug 300, negative wire 400 and positive wire 500；Wherein, shell 100 is arranged to single-ended closed barrel-shaped, and namely shell 100 one end is closed, one end open；It is internal that fuse 200 is placed in shell 100, near the blind end of shell 100；Sealing-plug 300 is arranged on the open end of shell, for being hedged off from the outer world by fuse 200, protects fuse 200；Negative wire 400 and positive wire 500 are connected with fuse 200 respectively, all stretch out from the opening of shell 100 through sealing-plug 300, and when electrolysis condenser uses, negative wire 400 and positive wire 500 connect external circuitry respectively.
As shown in Figure 2, fuse 200 includes the Cathode Foil 210 being connected with negative wire 400 winding and the anode foils 220 being connected with positive wire 500 winding, described fuse 200 also includes the insulation electrolytic paper 230 of winding parcel Cathode Foil 210 and anode foils 220 respectively, and described insulation electrolytic paper 230 separates Cathode Foil 210 and anode foils 220；Insulation electrolytic paper 230 is added with electrolyte.
Electrolysis condenser is the precision components of a kind of small volume, the characteristic joint effect of each parts of composition electrolysis condenser the performance of electrolysis condenser final products, it have been investigated that, the only simple size (including increasing the size of shell, Cathode Foil, anode foils and insulation electrolytic paper) increasing each parts, to increase the volume (inner space) of electrolysis condenser, it is be unable to reach under the premise ensureing electrochemical capacitor normal operation, improve its temperature tolerance and extend the practical application effect in its life-span, even cannot ensure the normal operation of electrolysis condenser.
Each parts of composition electrolysis condenser constitute a stable entirety, (its size, voltage or material etc. are such as changed) when needing the characteristic changing one of them parts, the characteristic of miscellaneous part needs relative change, to ensure electrolysis condenser normal operation.Through inventor's experimental study repeatedly, take below scheme can reach good technique effect: the rated value arranging the magnitude of voltage of anode foils 220 to be 630VF(be in fact Waste Acid From Hua Cheng Foil oxide-film proof voltage is 630VF), temperature during electrolysis condenser load can be effectively reduced, improve the temperature tolerance of electrolysis condenser；The voltage of Cathode Foil 210 is 1.5V-5V(be the final voltage that Cathode Foil is applied in formation process is in fact 1.5V-5V) and electrolysis condenser capacity between 4.7 μ F-47 μ F, so can effectively prevent electrolysis condenser to be bypassed interference when load；Insulation electrolytic paper 230 adopts compound two-layer insulation electrolytic paper, and its density is 70g/m3, and insulation electrolytic paper 230 thickness is 70 μm；Negative wire 400 and positive wire 500 all adopt high temperature chemical conversion lead-in wire, so can improve the temperature tolerance of electrolysis condenser, ensure that the electrolysis condenser performance when hot operation is (because when high temperature, the material of negative wire 400 and positive wire 500 is affected by high temperature and changes, it is easy to affect the electric conductivity of electrolysis condenser pin)；Sealing-plug adopts 100%IIR(butyl rubber) micelle material seal plug, so can increase the sealing of electrolysis condenser, it is ensured that fuse 200 is not by ectocine；Shell 100 basal diameter is 10-22mm, and height is 20-35mm, and the size suitably increasing shell can increase the inner space of electrolysis condenser, is conducive to strengthening the electrolysis condenser heat sinking function when load, thus improving the life-span of electrolysis condenser.
The invention also discloses the production technology of a kind of 400V electrolysis condenser, wherein, comprise the following steps:
A. make Cathode Foil and anode foils: galvano-cautery Cathode Foil and anode foils, make Cathode Foil and anode foils surface irregularity, so can be greatly increased Cathode Foil and anode foils and electrolytical contact area, improve the electric conductivity of electrolysis condenser；Aoxidizing Cathode Foil and anode foils after galvano-cautery, form oxide-film in Cathode Foil and anode foils surface, in practical application, main employing aluminium foil is as Cathode Foil and anode foils, and alumina foil makes its surface form the aluminium sesquioxide medium as electrolysis condenser；
B. cutting Cathode Foil, anode foils and insulation electrolytic paper, is connected lead-in wire with Cathode Foil and anode foils respectively, forms negative wire and positive wire, by insulation electrolytic paper and Cathode Foil, anode foils winding；In practical application, lead-in wire can be divided into the lead being directly connected to Cathode Foil and anode foils and the outer lead being connected with lead by supersonic bonding method, and lead is placed in enclosure, and outer lead is placed in housing exterior；
C. add electrolyte, electrolyte is impregnated in insulation electrolytic paper；The insulation electrolytic paper having adsorbed electrolyte is fitted layer by layer with Cathode Foil and anode foils；
D. last assembling, crimping, charging, burn-in test and parameter detecting are carried out.
Affect the factor of electrolysis condenser performance except forming the characteristic of each parts of electrolysis condenser, also having an important factor is exactly make the electrolyte of electrolysis condenser, and electrolyte must be worked in coordination to use with each parts of composition electrolysis condenser and be can be only achieved the technique effect improving electrolysis condenser performance.
In the present invention, the composition of described electrolyte includes: ethylene glycol 40%-50%, diethylene glycol 10%-20%, 2,2'-ethylenedioxybis(ethanol). 10%-20%, glycerol 10%-20%, gamma-hydroxybutyric acid lactone 10%-20%, decanedioic acid 1%-10%, ammonium sebacate 1%-10%, ortho-nitroanisole 0.1%-0.9%, p nitrobenzyl alcohol 0.1%-0.9%, benzene 0.1%-1%, polyvinyl alcohol 0.1%-1%, citric acid 0%-0.5%.
As shown in Figure 3, it is the test data of 400V electrolysis condenser in the present invention, including 4.7 μ F, 6.8 μ F, 8.2 μ F, 10 μ F, 22 μ F, 33 μ F and seven kinds of capacity of 47 μ F, each capacity takes 100 as test sample, records the meansigma methods of the peak of measurement parameter (including capacity, loss and the most important parameter of electric leakage these three electrolytic resistance) of 100 samples in every kind of capacity, minimum and 100 samples in Fig. 3.In the measurement of electrochemical capacitor, sample needs to meet the following conditions to be only certified products:
1, capacity can not exceed (higher or lower than) rated capacity 20%；
2, the loss of the electrolysis condenser of 400V is less than 20 × 0.01；
3, electric leakage is less than LCmax, wherein LCmax=capacity × voltage × 0.01(μ A)；
Test instrunment used by this test is TH2617 type capacitance measuring tester and TH2686 type LC tester, the method of testing adopted is temperature-accelerated life test method, wherein test temperature is 125 DEG C, the 400V electrochemical capacitor of the present invention uses 2500h to remain to keep normal operation when 125 DEG C, that is the electrolysis condenser of the present invention life-span when 125 DEG C be at least 2500h(namely when 115 DEG C the life-span be about 5000h, when 105 DEG C, the life-span is about 10000h).
The present invention is by utilizing the unit construction making electrolysis condenser of above-mentioned electrolyte and above-mentioned each particular characteristics parameter, the electrolysis condenser obtained is more higher than the temperature tolerance of electrolysis condenser of the prior art, life-span is longer, when 105 DEG C, the load life of the electrolysis condenser of the present invention is ten times of general electrolytic capacitor, and electrolysis condenser provided by the invention is particularly well-suited to tunnel (highway) illumination, seabed irradiation, court illumination or advertisement irradiation etc., and its durability and reliability are notable.
Technical scheme energy disclosed in this invention and only can be suitably used for 400V electrolysis condenser, if the present invention being used for the electrolysis condenser (such as the electrolysis condenser of 100V voltage) of other voltages, can not reach the technique effect of electrolysis condenser life to 10000 hour, if it is desired to the electrolysis condenser of other voltages is extended to more than 10000 hours at service life under 105 DEG C of temperature environments, other technologies scheme have to be used, refer to other application schemes of the applicant in detail.
Embodiment 1
Take Cathode Foil and anode foils: galvano-cautery Cathode Foil and anode foils, after galvano-cautery, aoxidize Cathode Foil and anode foils, form oxide-film in Cathode Foil and anode foils surface；Cutting Cathode Foil, anode foils and insulation electrolytic paper, be connected lead-in wire with Cathode Foil and anode foils respectively, form negative wire and positive wire, by insulation electrolytic paper and Cathode Foil, anode foils winding；Add electrolyte, electrolyte is impregnated in insulation electrolytic paper；Carry out last assembling, crimping, charging, burn-in test and parameter detecting.
In the present embodiment, the composition of described electrolyte includes: ethylene glycol 40%, diethylene glycol 20%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 2.2%, ammonium sebacate 6.1%: ortho-nitroanisole 0.9%, p nitrobenzyl alcohol 0.1%, benzene 0.1%, polyvinyl alcohol 0.1%, citric acid 0.5%.
In the present embodiment, the magnitude of voltage arranging anode foils is 630VF；The voltage of Cathode Foil is 1.5V；Insulation electrolytic paper adopts compound two-layer insulation electrolytic paper, and density is 70g/m3, and thickness is 70 μm；Negative wire and positive wire all adopt high temperature chemical conversion lead-in wire；Sealing-plug adopts 100%IIR micelle material seal plug；Electrolysis condenser voltage is 400V, and capacity is 4.7 μ F, and enclosure bottom diameter is 10mm, and height is 20mm.
The temperature tolerance that the present embodiment makes the electrolysis condenser obtained is good, and the life-span is long, and when 105 DEG C, load life can reach 10000-15000 hour, is particularly well-suited to tunnel (highway) illumination, seabed irradiation, court illumination or advertisement irradiation etc..
Embodiment 2
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 50%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 4.9%, ammonium sebacate 3%, ortho-nitroanisole 0.1%, p nitrobenzyl alcohol 0.9%, benzene 0.1%, polyvinyl alcohol 1%.
In the present embodiment, the voltage of Cathode Foil is 5V, and electrolysis condenser capacity is 6.8 μ F, and enclosure bottom diameter is 13mm, and height is 20mm.
Embodiment 3
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 40%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 18.5%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 5%, ammonium sebacate 4.5%, ortho-nitroanisole 0.5%, p nitrobenzyl alcohol 0.4%, benzene 0.3%, polyvinyl alcohol 0.3%, citric acid 0.5%.
In the present embodiment, the voltage of Cathode Foil is 3V, and electrolysis condenser capacity is 8.2 μ F, and enclosure bottom diameter is 13mm, and height is 21mm.
Embodiment 4
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 40%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 10%, ammonium sebacate 8.3%, ortho-nitroanisole 0.7%, p nitrobenzyl alcohol 0.5%, benzene 0.1%, polyvinyl alcohol 0.3%, citric acid 0.1%.
In the present embodiment, the voltage of Cathode Foil is 3V, and electrolysis condenser capacity is 10 μ F, and enclosure bottom diameter is 13mm, and height is 21mm.
Embodiment 5
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 47.7%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 1%, ammonium sebacate 9.3%, ortho-nitroanisole 0.7%, p nitrobenzyl alcohol 0.6%, benzene 0.1%, polyvinyl alcohol 0.2%, citric acid 0.4%.
In the present embodiment, the voltage of Cathode Foil is 4V, and electrolysis condenser capacity is 22 μ F, and enclosure bottom diameter is 16mm, and height is 25mm.
Embodiment 6
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 48.3%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 8.5%, ammonium sebacate 1%, ortho-nitroanisole 0.7%, p nitrobenzyl alcohol 0.1%, benzene 0.5%, polyvinyl alcohol 0.4%, citric acid 0.5%.
In the present embodiment, the voltage of Cathode Foil is 3.5V, and electrolysis condenser capacity is 33 μ F, and enclosure bottom diameter is 18mm, and height is 32mm.
Embodiment 7
The present embodiment is basic and embodiment 1 is identical, the difference is that, in the present embodiment, the composition of described electrolyte includes: ethylene glycol 40%, diethylene glycol 10%, 2,2'-ethylenedioxybis(ethanol). 10%, glycerol 10%, gamma-hydroxybutyric acid lactone 10%, decanedioic acid 9.3%, ammonium sebacate 9%, ortho-nitroanisole 0.7%, p nitrobenzyl alcohol 0.8%, benzene 0.1%, polyvinyl alcohol 0.1%.
In the present embodiment, the voltage of Cathode Foil is 3V, and electrolysis condenser capacity is 47 μ F, and enclosure bottom diameter is 22mm, and height is 35mm.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, it is possible to improved according to the above description or convert, all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (9)
1. a 400V electrolysis condenser, it is characterised in that include shell, fuse, sealing-plug, negative wire and positive wire；Described shell is arranged to single-ended closed barrel-shaped, and described fuse is placed in enclosure, and sealing-plug is arranged on the open end of shell, negative wire and positive wire and is connected with fuse respectively, all stretches out from the opening of shell through sealing-plug；
Described fuse includes the Cathode Foil being connected with negative wire winding and the anode foils being connected with positive wire winding, and described fuse also includes the insulation electrolytic paper of winding parcel Cathode Foil and anode foils respectively, and described insulation electrolytic paper separates Cathode Foil and anode foils；Described insulation electrolytic paper is added with electrolyte；
The specified oxide-film proof voltage of described anode foils is 630V；
The voltage of described Cathode Foil is 1.5V-5V；
Described electrolysis condenser capacity is 4.7 μ F-47 μ F；
Described insulation electrolytic paper adopts compound two-layer insulation electrolytic paper, and density is 70g/m3, and thickness is 70 μm；
Described negative wire and positive wire all adopt high temperature chemical conversion lead-in wire；
Described sealing-plug adopts 100%IIR micelle material seal plug；
Described enclosure bottom diameter is 10-22mm, and height is 20-35mm；
The composition of described electrolyte includes: ethylene glycol 40%-50%, diethylene glycol 10%-20%, 2,2'-ethylenedioxybis(ethanol). 10%-20%, glycerol 10%-20%, gamma-hydroxybutyric acid lactone 10%-20%, decanedioic acid 1%-10%, ammonium sebacate 1%-10%, ortho-nitroanisole 0.1%-0.9%, p nitrobenzyl alcohol 0.1%-0.9%, benzene 0.1%-1%, polyvinyl alcohol 0.1%-1%, citric acid 0%-0.5%.
2. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 4.7 μ F, and described enclosure bottom diameter is 10mm, height is 20mm.
3. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 6.8 μ F, and described enclosure bottom diameter is 13mm, height is 20mm.
4. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 8.2 μ F, and described enclosure bottom diameter is 13mm, height is 21mm.
5. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 10 μ F, and described enclosure bottom diameter is 13mm, height is 21mm.
6. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 22 μ F, and described enclosure bottom diameter is 16mm, height is 25mm.
7. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 33 μ F, and described enclosure bottom diameter is 18mm, height is 32mm.
8. 400V electrolysis condenser according to claim 1, it is characterised in that described 400V electrolysis condenser capacity is 47 μ F, and described enclosure bottom diameter is 22mm, height is 35mm.
9. the production technology of the 400V electrolysis condenser as described in claim 1-8 any one, it is characterised in that comprise the following steps:
A. make Cathode Foil and anode foils: galvano-cautery Cathode Foil and anode foils, after galvano-cautery, aoxidize Cathode Foil and anode foils, form oxide-film in Cathode Foil and anode foils surface；
B. cutting Cathode Foil, anode foils and insulation electrolytic paper, is connected lead-in wire with Cathode Foil and anode foils respectively, forms negative wire and positive wire, by insulation electrolytic paper and Cathode Foil, anode foils winding；
C. add electrolyte, electrolyte is impregnated in insulation electrolytic paper；
D. last assembling, crimping, charging, burn-in test and parameter detecting are carried out.
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| CN106356193B (en) * | 2016-10-25 | 2018-01-19 | 益阳市和天电子有限公司 | A kind of electric capacity for using conductive carbon paper tinsel/ceramic foil as negative pole |
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