JPH0477456B2 - - Google Patents
Info
- Publication number
- JPH0477456B2 JPH0477456B2 JP14870487A JP14870487A JPH0477456B2 JP H0477456 B2 JPH0477456 B2 JP H0477456B2 JP 14870487 A JP14870487 A JP 14870487A JP 14870487 A JP14870487 A JP 14870487A JP H0477456 B2 JPH0477456 B2 JP H0477456B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic capacitor
- boric acid
- sheet
- outer case
- capacitor element
- 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 33
- 239000004327 boric acid Substances 0.000 claims description 18
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 12
- -1 boric acid compound Chemical class 0.000 claims description 9
- 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
- 230000000694 effects Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000011230 binding agent Substances 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
- 206010000369 Accident Diseases 0.000 description 1
- 206010037660 Pyrexia 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
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Electric Double-Layer Capacitors Or The Like (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、ホウ酸またはホウ酸化合物を含む
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〕
ホウ酸またはホウ酸化合物は、発火等による発
熱を受けると、
2H3BO3→B2O3＋3H2Ｏ（ｇ）↑
の変化をし、消火効果の高いH2Ｏ（ｇ）を放出す
る。
したがつて、ホウ酸またはホウ酸化合物を含む
シートは加熱に伴い、H2Ｏ（ｇ）が消火機能を果
たして、引火している電解液を消火する。
また、ホウ酸またはホウ酸化合物は電解液に反
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。
なお、ホウ酸またはホウ酸化合物含むシート
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シートにホウ酸ま
たはホウ酸化合物からなる粉体を付着させ、ある
いはホウ酸またはホウ酸化合物からなる粉体をバ
インダーによりスラリー状態として多孔質のシー
トに塗布し、バインダーを発散させて形成する。
〔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ホウ酸
からなる粉体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
前記実施例１〜２と同一定格で、前記シートを
具備しない電解コンデンサを従来例とし、実施例
および従来例を各10個用意して各試料に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 Problems] The present invention is characterized in that a sheet containing boric acid or a boric acid compound is housed inside an 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. [Effect] When boric acid or boric acid compounds are exposed to heat due to ignition, etc., they change as follows: 2H 3 BO 3 →B 2 O 3 +3H 2 O (g) ↑, and H 2 O (g) has a high fire extinguishing effect. emit. Therefore, as the sheet containing boric acid or a boric acid compound is heated, H 2 O (g) performs a fire extinguishing function and extinguishes the ignited electrolyte. Further, boric acid or a boric acid compound hardly reacts with the electrolytic solution and does not adversely affect the electrical characteristics of the electrolytic capacitor over time. A sheet containing boric acid or a boric acid compound is produced by attaching powder made of boric acid or a boric acid compound to a porous sheet made of a non-flammable or flame-retardant material such as glass fiber cloth or ceramic paper, or Alternatively, powder made of a boric acid compound is applied to a porous sheet in the form of a slurry using a binder, and the binder is dispersed. [Examples] Examples of the present invention will be described below with reference to the drawings.
The electrolytic capacitor 1 includes an electrolytic capacitor element 2 formed by winding bipolar electrode foil 8 together with electrolytic paper 9, housed 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. The sealing member 3 is connected to an external connection terminal 10 inserted through the outer case 4, and the sealing member 3 is attached to the opening of the outer case 4. Example 1 A sheet 6 made of a porous sheet made of glass fiber cloth to which powder made of boric acid was attached was prepared with 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 having the same rating as those of Examples 1 and 2 and without the sheet was used as a conventional example, and 10 each of the example and the conventional example were prepared, an overvoltage of 300 V was applied to each sample, and the voltage was applied. The presence or absence of subsequent ignition and the extinguishing time after ignition were measured. The results are shown below.
以上のようにこの発明は、ホウ酸またはホウ酸
化合物を含むシートを、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、
ホウ酸またはホウ酸化合物がH2Ｏ（ｇ）を放出し
て消火機能を果たすので、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 boric acid or a boric acid compound is housed inside the outer 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 outer case. , 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, so that excessive electrical stress is applied to the electrolytic capacitor and the electrolytic capacitor element If you have a fever,
Boric acid or boric acid compounds perform a fire extinguishing function by releasing H 2 O (g), which can prevent the electrolyte from igniting, or if it ignites, it can immediately perform a self-extinguishing function and protect other electronic devices in electronic equipment. This prevents the spread of fire to parts.
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. 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)
電解コンデ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 sheet containing boric acid or a boric acid compound,
A flame-retardant electrolytic capacitor characterized by being housed inside an exterior case of an 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 |
|---|---|---|---|
| JP14870487A JPS63312622A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14870487A JPS63312622A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63312622A JPS63312622A (en) | 1988-12-21 |
| JPH0477456B2 true JPH0477456B2 (en) | 1992-12-08 |
Family
ID=15458729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14870487A Granted JPS63312622A (en) | 1987-06-15 | 1987-06-15 | Fire retardant electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63312622A (en) |
-
1987
- 1987-06-15 JP JP14870487A patent/JPS63312622A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63312622A (en) | 1988-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |