JPH0477455B2 - - Google Patents
Info
- Publication number
- JPH0477455B2 JPH0477455B2 JP14870387A JP14870387A JPH0477455B2 JP H0477455 B2 JPH0477455 B2 JP H0477455B2 JP 14870387 A JP14870387 A JP 14870387A JP 14870387 A JP14870387 A JP 14870387A JP H0477455 B2 JPH0477455 B2 JP H0477455B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic capacitor
- calcium carbonate
- sheet
- capacitor element
- electrolytic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 35
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 22
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 11
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
〔産業上の利用分野〕
この発明は難燃化電解コンデンサに係り、例え
ば防爆弁動作時に引火等で生ずる電解液の火災を
最小限に抑制する電解コンデンサに関する。
〔従来の技術〕
一般に、電解コンデンサに過大な電気ストレス
が加えられると、防爆機能を有する防爆弁等が動
作するが、電解コンデンサ素子は約200℃以上の
発熱を伴い、電解液が発火する場合があつた。
そのため、従来このような弊害を防止する手段
として、電解コンデンサの内部あるいは外部に温
度ヒユーズ等の通電遮断手段を具備したもの、あ
るいは電解コンデンサ素子を収納する外装ケース
を多重構造とし、この複数の外装ケースの間隙に
消火剤を封入したもの等があつた。
〔発明が解決しようとする問題点〕
従来の外装ケースの多重構造によるものは構造
が複雑であり、製造工程の複雑化、部品点数の増
加に伴うコスト増等を招来していた。
また、電解コンデンサの内部あるいは外部に通
電遮断手段を具備したものは、電解コンデンサの
構造が複雑になるとともに、電解コンデンサの肥
大化を招き、小型の電解コンデンサでは採用し得
ないものであつた。更に、急激な温度上昇に伴う
発火事故に対応することができない場合もあつ
た。
〔問題点を解決する手段〕
この発明は、炭酸カルシウムを含むシートを、
電解コンデンサの外装ケースの内部に収納したこ
とを特徴としている。
またシートは、電解コンデンサ素子と外装ケー
ス内底面との間隙、外装ケース内表面、封口材内
表面、電解コンデンサ素子内部またはこれらの組
合せより選択される位置に収納していることを特
徴としている。
〔作用〕
炭酸カルシウムは、発火等による熱を受ける
と、CO2とCaOに解離し、熱を吸収する。
CaCO3＝CaO＋CO2−42.0Kcal
したがつて、炭酸カルシウムを含むシートは加
熱に伴い、CO2が消火機能を果たすとともに、電
解コンデンサ内部の熱を吸収して加熱している電
解コンデンサ素子、電解液等を冷却し、引火して
いる電解液の消火を可能にする。
また、炭酸カルシウムは電解液に反応すること
が少なく、電解コンデンサの経時的な電気特性に
悪影響を及ぼすことがない。
炭酸カルシウムを含むシートは、ガラス繊維
布、セラミツクペーパー等の不燃、難燃性の素材
からる多孔質のシートに炭酸カルシウム粉を付着
させたもの、あるいは炭酸カルシウムをバインダ
ーによりスラリー状態として、これを多孔質のシ
ートに塗布し、バインダーを発散させたものを用
いる。
〔実施例〕
以下この発明の実施例を図面により説明する。
電解コンデンサ１は、両極電極箔８を電解紙９と
ともに巻回して形成した電解コンデンサ素子２を
外装ケース４に収納し、電解コンデンサ素子２か
ら導出された電極引出し用のリード線５と封口体
３を挿通する外部接続端子１０とを接続するとと
もに、該封口体３を外装ケース４の開口部に装着
している。
実施例 １
ガラス繊維布からなる多孔質のシートに炭酸カ
ルシウム粉を付着させたシート６を、第１図に示
すように、定格電圧200WV、定格静電容量
470μFの電解コンデンサ１の外装ケース４の内底
面と電解コンデンサ素子２の側面との間隙に収納
した。
実施例 ２
実施例１と同じ組成からなるシート７を、第２
図に示すように、帯状に形成し、実施例１と同一
定格の電解コンデンサ素子２とともに巻回した。
実施例 ３
実施例１〜２と同一定格の電解コンデンサで、
前記シートが配置されないものを従来例として準
備し、実施例および従来例各10個を用意して各試
料に300Vの過電圧を印加し、電圧印加後の発火
の有無、発火後の消火時間を測定した。その結果
を次に示す。
[Industrial Application Field] The present invention relates to a flame-retardant electrolytic capacitor, and more particularly, to an electrolytic capacitor that minimizes fires caused by electrolyte caused by ignition during the operation of an explosion-proof valve. [Prior art] Generally, when excessive electrical stress is applied to an electrolytic capacitor, explosion-proof valves with explosion-proof functions operate, but electrolytic capacitor elements generate heat of approximately 200°C or more, and the electrolyte may catch fire. It was hot. Therefore, as a conventional means to prevent such adverse effects, electrolytic capacitors are equipped with a current cutoff means such as a temperature fuse inside or outside, or a multi-layered exterior case is used to house the electrolytic capacitor elements. There was something filled with extinguishing agent in the gap between the cases. [Problems to be Solved by the Invention] Conventional exterior cases with multiple structures have a complicated structure, resulting in complicated manufacturing processes and increased costs due to an increase in the number of parts. Further, an electrolytic capacitor provided with a current cutoff means inside or outside would complicate the structure of the electrolytic capacitor and cause the electrolytic capacitor to become bulky, making it impossible to use it as a small electrolytic capacitor. Furthermore, there were cases in which it was impossible to respond to fire accidents caused by rapid temperature rises. [Means for solving the problem] This invention provides a sheet containing calcium carbonate,
It is characterized by being housed inside the exterior case of an electrolytic capacitor. Further, the sheet is characterized in that it is housed in a position selected from the gap between the electrolytic capacitor element and the inner bottom surface of the outer case, the inner surface of the outer case, the inner surface of the sealing material, inside the electrolytic capacitor element, or a combination thereof. [Action] When calcium carbonate receives heat due to ignition, etc., it dissociates into CO 2 and CaO and absorbs heat. CaCO 3 = CaO + CO 2 -42.0Kcal Therefore, as the sheet containing calcium carbonate is heated, CO 2 performs a fire extinguishing function, and the electrolytic capacitor element and electrolyte which are heated by absorbing the heat inside the electrolytic capacitor. etc., making it possible to extinguish the ignited electrolyte. In addition, calcium carbonate hardly reacts with the electrolytic solution and does not adversely affect the electrical characteristics of the electrolytic capacitor over time. Sheets containing calcium carbonate are made by adhering calcium carbonate powder to a porous sheet made of non-flammable and flame-retardant materials such as glass fiber cloth or ceramic paper, or by making calcium carbonate into a slurry state with a binder. It is applied to a porous sheet to release the binder. [Examples] Examples of the present invention will be described below with reference to the drawings.
The electrolytic capacitor 1 houses an electrolytic capacitor element 2 formed by winding bipolar electrode foil 8 together with electrolytic paper 9 in an exterior case 4, and a lead wire 5 for drawing out electrodes led out from the electrolytic capacitor element 2 and a sealing body 3. At the same time, the sealing body 3 is attached to the opening of the exterior case 4. Example 1 A sheet 6 made of a porous sheet made of glass fiber cloth to which calcium carbonate powder was attached was heated to a rated voltage of 200 WV and a rated capacitance as shown in FIG.
A 470 μF electrolytic capacitor 1 was housed in the gap between the inner bottom surface of the outer case 4 and the side surface of the electrolytic capacitor element 2. Example 2 The sheet 7 having the same composition as in Example 1 was
As shown in the figure, it was formed into a band shape and wound together with an electrolytic capacitor element 2 having the same rating as in Example 1. Example 3 An electrolytic capacitor with the same rating as Examples 1 and 2,
Prepare a sample without the above-mentioned sheet as a conventional example, prepare 10 each of the example and the conventional example, apply an overvoltage of 300 V to each sample, and measure the presence or absence of ignition after voltage application and the extinguishing time after ignition. did. The results are shown below.
以上のようにこの発明は、炭酸カルシウムを含
むシートを、電解コンデンサの外装ケースの内部
に収納したことを特徴とし、また、シートは、電
解コンデンサ素子と外装ケース内底面との間隙、
外装ケース内表面、封口材内表面、電解コンデン
サ素子内部またはこれらの組合せより選択される
位置に収納していることを特徴としているので、
電解コンデンサに過大な電気ストレスが加えられ
電解コンデンサ素子が発熱した場合、炭酸カルシ
ウムがCO2とCaOとに解離し、消火機能を果たす
とともに、吸熱反応によつて温度を下げるので、
電解液の発火を防止し、あるいは発火してもただ
ちに自己消火機能を果たし、電子機器内の他の電
子部品に延焼することがなくなる。
As described above, the present invention is characterized in that a sheet containing calcium carbonate is housed inside the exterior case of an electrolytic capacitor, and the sheet is arranged in the gap between the electrolytic capacitor element and the inner bottom surface of the exterior case.
It is characterized by being stored in a position selected from the inner surface of the outer case, the inner surface of the sealing material, the inside of the electrolytic capacitor element, or a combination thereof.
When excessive electrical stress is applied to an electrolytic capacitor and the electrolytic capacitor element generates heat, calcium carbonate dissociates into CO 2 and CaO, which functions as a fire extinguisher and lowers the temperature through an endothermic reaction.
It prevents the electrolyte from igniting, or even if it ignites, it immediately performs a self-extinguishing function, preventing the fire from spreading to other electronic components within the electronic device.
第１図はこの発明の第１の実施例を示した断面
図、第２図はこの発明の第２の実施例を示した断
面図である。
１……電解コンデンサ、２……電解コンデンサ
素子、３……封口体、４……外装ケース、５……
リード線、６，７……シート、８……電極箔、９
……電解紙、１０……外部接続端子。
FIG. 1 is a sectional view showing a first embodiment of the invention, and FIG. 2 is a sectional view showing a second embodiment of the invention. 1... Electrolytic capacitor, 2... Electrolytic capacitor element, 3... Sealing body, 4... Exterior case, 5...
Lead wire, 6, 7... Sheet, 8... Electrode foil, 9
...Electrolytic paper, 10...External connection terminal.
Claims (1)
ンサの外装ケース内部に収納したことを特徴とす
る難燃化電解コンデンサ。 ２ 前記シートは、電解コンデンサ素子と外装ケ
ース内底面との間隙、外装ケース内表面、封口材
内表面、電解コンデンサ素子内部またはこれらの
組合せより選択される位置に収納していることを
特徴とする特許請求の範囲第１項記載の難燃化電
解コンデンサ。[Claims] 1. A flame-retardant electrolytic capacitor, characterized in that a sheet containing calcium carbonate is housed inside an exterior case of the electrolytic capacitor. 2. The sheet is housed in a position selected from the gap between the electrolytic capacitor element and the inner bottom surface of the outer case, the inner surface of the outer case, the inner surface of the sealing material, inside the electrolytic capacitor element, or a combination thereof. A flame-retardant electrolytic capacitor according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14870387A JPS63312621A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14870387A JPS63312621A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63312621A JPS63312621A (en) | 1988-12-21 |
| JPH0477455B2 true JPH0477455B2 (en) | 1992-12-08 |
Family
ID=15458707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14870387A Granted JPS63312621A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63312621A (en) |
-
1987
- 1987-06-15 JP JP14870387A patent/JPS63312621A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63312621A (en) | 1988-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |