JP2011204726A - Power storage device - Google Patents
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- JP2011204726A JP2011204726A JP2010067794A JP2010067794A JP2011204726A JP 2011204726 A JP2011204726 A JP 2011204726A JP 2010067794 A JP2010067794 A JP 2010067794A JP 2010067794 A JP2010067794 A JP 2010067794A JP 2011204726 A JP2011204726 A JP 2011204726A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
Description
本発明は、蓄電デバイスに関するものである。特に、防爆弁を設けた蓄電デバイスに関するものである。 The present invention relates to an electricity storage device. In particular, the present invention relates to an electricity storage device provided with an explosion-proof valve.
蓄電デバイスたとえばアルミニウム電解コンデンサは、表面をエッチング処理し化成による酸化膜を形成した陽極箔と、表面をエッチング処理し酸化膜を形成しない、あるいは低圧化成による酸化膜を形成した陰極箔とを電解紙等のセパレータを介して巻き回したコンデンサ素子に電解液を含浸し、このコンデンサ素子をアルミニウム製のケース内に収納後、陽極箔および陰極箔から引き出した引き出しリードタブを、蓋を貫通する外部端子にそれぞれ接続し、蓋をケースに取り付けて密閉した構造になっている。 An electric storage device such as an aluminum electrolytic capacitor is an electrolytic paper in which an anode foil having an oxide film formed by etching the surface and forming an oxide film and a cathode foil having an oxide film formed by etching the surface and not formed or formed by an oxide film formed by low pressure conversion Capacitor element wound through a separator such as an electrolyte is impregnated with electrolyte solution, and after this capacitor element is stored in an aluminum case, lead lead tabs drawn from the anode foil and cathode foil are connected to external terminals that penetrate the lid. Each is connected, and a lid is attached to the case and sealed.
ところで、従来、アルミニウム電解コンデンサの寿命劣化に伴って発生するガスにより、内部圧力が上昇し、コンデンサ素子を収納するケースが破裂する場合があり、この破裂を防止するために、ケースの底面または側面に、溝状の防爆弁を設け、この溝状の防爆弁がさけることにより内部圧力を外部に逃がしていた。特に、ケースの内底面の中央に、コンデンサ素子巻き芯の固定用の突起がある場合や、ケースの外底面側に冷却用のヒートシンクなどがあり、ケースの底面部分にこの溝状の防爆弁を設けることができない場合には、ケースの側面に溝状の防爆弁を設けていた。 By the way, conventionally, there is a case where the internal pressure rises due to the gas generated along with the deterioration of the lifetime of the aluminum electrolytic capacitor, and the case housing the capacitor element may be ruptured. In addition, a groove-shaped explosion-proof valve is provided, and the internal pressure is released to the outside by avoiding the groove-shaped explosion-proof valve. In particular, there is a protrusion for fixing the capacitor element core at the center of the inner bottom of the case, or there is a heat sink for cooling on the outer bottom side of the case, and this groove-shaped explosion-proof valve is attached to the bottom of the case. If it could not be provided, a groove-shaped explosion-proof valve was provided on the side of the case.
ケースの側面に溝状の防爆弁を設ける例として、特許文献１には、切削用バイトによる切削方法や、押切刃により、ケースの側面の長さ方向に、防爆圧に対応した深さに直線状の溝を形成する方法が記載されている。
また、特許文献２には、リチウム２次電池において、内圧上昇により爆発の危険を回避するために、ケースの底面または側面に溝状の防爆弁を設ける方法が開示されている。
As an example in which a groove-shaped explosion-proof valve is provided on the side surface of the case,
蓄電デバイスを大容量化すると、使用するケースも大型化する必要があり、それに伴ってケースの厚さも充分厚い必要がある。ところで、溝状の防爆弁にとっては、溝部周辺が変形し溝がさける必要があるが、ケースの厚さが厚くなると、この溝部周辺の変形が容易ではなくなってしまう。
また、少しのふくれ変化で溝状の防爆弁がさけるようにするには、ケースの厚さに対して十分深い溝を設ける必要があるが、溝部のケースの厚さが薄くなるため、加工精度が得にくく、動作圧にばらつきが生じやすい。また、ケースのふくれ以外の理由たとえば振動などで溝部に亀裂が発生してしまう恐れもある。
When the capacity of the electricity storage device is increased, it is necessary to increase the size of the case used, and accordingly, the thickness of the case needs to be sufficiently thick. By the way, for the groove-shaped explosion-proof valve, it is necessary to deform the periphery of the groove and avoid the groove. However, when the thickness of the case is increased, the deformation around the groove is not easy.
Also, in order to avoid the groove-shaped explosion-proof valve with a slight bulge change, it is necessary to provide a groove that is sufficiently deep with respect to the thickness of the case. Is difficult to obtain, and the operating pressure tends to vary. Further, there is a possibility that a crack may occur in the groove due to reasons other than the case swelling, such as vibration.
本発明は、上記の問題点を解決するためになされたもので、ケースの厚さが厚くても容易に溝部周辺が変形して溝がさけやすく、内部圧力が問題圧力に上昇した場合には、迅速に防爆弁機能が動作する蓄電デバイスを得ることを目的としている。 The present invention has been made to solve the above problems, and even when the thickness of the case is large, the periphery of the groove portion is easily deformed to easily avoid the groove, and the internal pressure rises to the problem pressure. The purpose is to obtain an electricity storage device in which the explosion-proof valve function operates quickly.
本発明は、溝状の防爆弁を設けたケースに素子を収納した蓄電デバイスにあって、前記防爆弁の溝部周辺の左右どちらか一方のケースの肉厚を薄くしたことを特徴とする蓄電デバイスを提供するものである。 The present invention relates to an electricity storage device in which an element is housed in a case provided with a groove-shaped explosion-proof valve, wherein the wall thickness of either the left or right case around the groove portion of the explosion-proof valve is reduced. Is to provide.
本発明は、溝部周辺の左右どちらか一方のケースの肉厚を薄くしたことにより、肉厚の薄い側が肉厚を薄くしていない側より大きく変形するので容易に溝部がさけやすく、内部圧力が問題圧力に上昇した場合には迅速に防爆弁機能が動作するコンデンサを得ることができる。 In the present invention, by reducing the thickness of either the left or right case around the groove, the thinner side is deformed more than the non-thinned side, so the groove is easily avoided and the internal pressure is reduced. When the pressure rises to the problem pressure, a capacitor with an explosion-proof valve function can be obtained quickly.
本発明に述べる素子は、寿命劣化に伴って発生するガスまたはその他の理由でガスが発生する可能性のある素子をさす。たとえば、アルミニウム電解コンデンサの素子の場合には、表面をエッチング処理し化成による酸化膜を形成した陽極箔と、表面をエッチング処理し酸化膜を形成しない、あるいは低圧化成による酸化膜を形成した陰極箔とを電解紙等のセパレータを介して巻き回したもので電解液を含浸してある。
また、リチウムイオン２次電池の素子の場合には、正極にリチウム金属酸化物を用い、負極にグラファイトなどの炭素材を用い、集電箔に塗布して電解紙等のセパレータを介して巻き回したもので電解液を含浸してある。
The element described in the present invention refers to an element that may generate gas due to deterioration of its lifetime or for other reasons. For example, in the case of an element of an aluminum electrolytic capacitor, an anode foil whose surface is etched to form an oxide film by chemical conversion, and a cathode foil whose surface is etched to form no oxide film, or an oxide film by low pressure chemical conversion is formed. Is wound through a separator such as electrolytic paper and impregnated with an electrolytic solution.
In the case of an element of a lithium ion secondary battery, a lithium metal oxide is used for the positive electrode, a carbon material such as graphite is used for the negative electrode, it is applied to a current collector foil and wound through a separator such as electrolytic paper. And impregnated with an electrolytic solution.
本発明に述べるケースは、上面が開口したアルミニウム、ステンレス等の金属材からなり、外観的に円柱状や楕円柱状の円筒形または角形に形成されている。ケース内側の底部には、中央に素子巻き芯の固定用の突起があってもよい。 The case described in the present invention is made of a metal material such as aluminum or stainless steel whose upper surface is open, and is formed in a cylindrical or elliptical cylindrical or rectangular shape in appearance. On the bottom inside the case, there may be a protrusion for fixing the element winding core in the center.
本発明に述べる溝状の防爆弁は、ケースの側面または底面にあって、防爆弁の溝部周辺の左右どちらか一方のケースの肉厚を薄くした防爆弁である。そのため、肉厚の薄い側が肉厚を薄くしていない側より大きく変形するので容易に溝部がさけやすく、内部圧力が問題圧力に上昇した場合には迅速に防爆弁機能が動作する。
防爆弁の形状は、例えば、溝の長さは、３ｍｍから３０ｍｍ程度で、溝の幅は０．２ｍｍから２ｍｍ程度、溝の深さはケースの側面の厚さの９０％から７０％程度で作動するようにするが、これらの適正値はケースサイズにより選定する。
ケースの肉厚を薄くする形状は、段差を設けるか、またはテーパーを設ける。段差としては、溝の深さの３０％から９０％程度で、溝の幅の１．５倍から１０倍程度の幅とする。テーパーとしては、溝の深さ方向から２０度から７０度程度傾ける。
溝の方向は、ケースの軸方向またはそれより少し傾いていてもよいし、Ｓ字状のように波打っていてもよい。またエ形やＹ形など主直線部分以外に枝があってもよい。
溝の作成方法は、プレス、または切削用バイトによる切削方法、または押切刃により作成することができる。
また、溝部周辺の左右どちらか一方のケースの肉厚を薄くする方法は、溝を作成する前にプレス等で成形しておく。または、溝を作成後、切削用バイトによる切削方法により作成する。
The groove-shaped explosion-proof valve described in the present invention is an explosion-proof valve that is provided on the side surface or bottom surface of the case and in which one of the left and right cases around the groove portion of the explosion-proof valve is thinned. For this reason, since the thin side is deformed more greatly than the non-thin side, the groove portion can be easily avoided, and the explosion-proof valve function operates quickly when the internal pressure rises to the problem pressure.
The shape of the explosion-proof valve is, for example, the length of the groove is about 3 mm to 30 mm, the width of the groove is about 0.2 mm to 2 mm, and the depth of the groove is about 90% to 70% of the thickness of the side surface of the case. The appropriate values are selected according to the case size.
The shape for reducing the thickness of the case is provided with a step or a taper. The step is about 30% to 90% of the depth of the groove, and about 1.5 to 10 times the width of the groove. The taper is inclined by about 20 to 70 degrees from the depth direction of the groove.
The direction of the groove may be inclined slightly or slightly in the axial direction of the case, or may be wavy like an S shape. Further, there may be branches other than the main straight line portion such as the D shape and the Y shape.
The groove can be formed by a press, a cutting method using a cutting tool, or a press cutting blade.
In addition, a method of reducing the thickness of either the left or right case around the groove is formed by pressing or the like before the groove is formed. Or, after creating the groove, it is created by a cutting method using a cutting tool.
以下、本発明の実施の形態を図面に基づいて説明する。
図１は、本発明に係る蓄電デバイスとそのケースの一部断面図を示している。
図１（ａ）は、アルミニウム電解コンデンサを、図１（ｂ）は、その防爆弁のところのＡ−Ａ’断面図を、図１（ｃ）は、ケース内部の圧力が所定の圧力に達したときに、図１（ｂ）の部分の溝部が変形してさけたことを模式的に示している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a partial cross-sectional view of an electricity storage device and its case according to the present invention.
FIG. 1 (a) shows an aluminum electrolytic capacitor, FIG. 1 (b) shows an AA ′ cross-sectional view of the explosion-proof valve, and FIG. 1 (c) shows that the pressure inside the case reaches a predetermined pressure. FIG. 1 schematically shows that the groove portion in FIG.
図１（ａ）に示すように、本発明に係る蓄電デバイスたとえばアルミニウム電解コンデンサの場合は、通常のアルミニウム電解コンデンサと同様に、電極箔を適当な幅に裁断された後、電極箔に引き出しリード箔を接続し、紙などのセパレータと共に捲回または積層されたコンデンサ素子が、電解液と共に上面が開口したアルミニウム等の金属材からなり外観的に円筒状や楕円筒状に形成されているケース１内に収容し、封口板により封口されていて、電極箔から引き出されたリード箔が、封口板を貫通した外部端子２に接続されている構造になっている。図１（ｂ）に示すように、そしてケースの側面には、少なくともひとつの溝状の防爆弁３を設けていて、溝部周辺の左右どちらか一方にケースの肉厚より薄くなっているテーパー状の薄厚部分４を設けている。
このことにより、図１（ｃ）に示すように、肉厚の薄い側が肉厚を薄くしていない側よりケース外側に押し広げるように大きく変形するので、変形に差があり、容易に溝部がさけやすく、内部圧力が問題圧力に上昇した場合には迅速に防爆弁機能が動作する。
As shown in FIG. 1 (a), in the case of an electric storage device according to the present invention, for example, an aluminum electrolytic capacitor, the electrode foil is cut to an appropriate width and then drawn out to the electrode foil in the same manner as a normal aluminum electrolytic capacitor. A
As a result, as shown in FIG. 1 (c), the thin side is greatly deformed so as to be pushed outward from the non-thin side, so that there is a difference in deformation, and the groove portion is easily formed. When the internal pressure rises to the problem pressure, the explosion-proof valve function operates quickly.
実施例１は、定格４００Ｖ、１２００μＦの電解コンデンサを製造する場合について説明する。
先ず、封口板とケースを準備しておく。封口板は、厚さ２ｍｍの紙フェノール絶縁板の表面に、厚さ１ｍｍのブチルゴム板を、その裏側には厚さ１００μｍのイオン物質遮断性の樹脂フィルムとしてポリプロピレンを貼り合わせて、打ち抜き加工により封口板の外形加工と、封口板を貫通する外部端子用の貫通孔を設けた。次に、ゴム板側にリベットとそれに取り付けた金属板端子を設け、絶縁板側から固定用のワッシャをリベットの先から差し込んで、封口板に外部端子を固定した。
ケースは、直径４０ｍｍ、高さ８０ｍｍ、肉厚０．５ｍｍの一方に開放口のある円柱形のものを使用した。溝状の防爆弁は、図１に示すように、溝の長さは１０ｍｍで、溝の幅は０．３ｍｍ、溝の深さは０．３５ｍｍとし、溝部の左側を溝の深さ方向から６０度傾けたテーパー状に加工して溝部周辺の一方のケースの肉厚を薄くした。
次に、陽極箔は厚さ約１００μｍのアルミニウム箔を処理して製造する。すなわち、このアルミニウム箔を直流および化学エッチング法によって粗面化する。粗面化後、純水中でボイルする。ボイル後、ホウ酸の化成液中において、６００Ｖの直流電圧をかけて化成し、化成膜を形成する。化成処理後、安定化するために、リン酸処理をし、ついで温度５５０℃で焼成処理をする。焼成処理後、幅４０ｍｍ、長さ３０００ｍｍの大きさに切断して、陽極箔とする。
また、陽極用リード箔には未エッチングで６００Ｖの化成処理を施した厚さ１５０μｍ、幅５ｍｍ、長さ６０ｍｍのアルミニウム箔を用いる。そしてこの陽極用リード箔を陽極箔にコールドウェルドにより接続する。
陰極箔は、厚さ３０μｍのアルミニウム箔をエッチング、リン酸処理後、約２００μＦ／ｃｍ２としたものを用い、幅４０ｍｍ、長さ３０５０ｍｍの大きさに切断する。
陰極用リード箔は、アルミニウム箔を長さ１５０μｍ、幅１０００ｍｍに圧延し、次いで焼なまし、５００ｍｍの幅に切断した後、さらに幅５ｍｍの大きさに切断して製造する。そしてこの陰極用リード箔を陰極箔にコールドウェルドにより接続する。
電解紙としては、幅５０ｍｍのものを使用し、厚さ６０μｍ、密度０．７５ｇ／ｃｍ３のクラフト紙を用いた。
この電解紙を介して陽極箔と陰極箔とを積層して捲回し、コンデンサ素子を形成した。その後、エチレングリコールと２−ブチルオクタン二酸アンモニウムの有機酸系電解液を含浸した。
電解液を含浸後、コンデンサ素子から引き出した陽極用リード箔及び陰極用リード箔の端部に、リベット差し込み用の穴をあけ、そして、各々封口板に貫通して設けた陽極端子及び陰極端子に接続した。接続後、ケースにコンデンサ素子を収納した。収納後、封口板をケースの端に取り付けて、ケースを密閉した。ケースを密閉後、温度８５℃の雰囲気中に放置して４２５Ｖの電圧を加えてエージング処理した。
Example 1 describes the case of manufacturing an electrolytic capacitor having a rating of 400 V and 1200 μF.
First, a sealing plate and a case are prepared. The sealing plate is a 1 mm thick butyl rubber plate on the surface of a 2 mm thick paper phenolic insulating plate, and the back side is bonded with polypropylene as an ionic substance blocking resin film with a thickness of 100 μm. The outer shape of the plate and a through hole for an external terminal penetrating the sealing plate were provided. Next, a rivet and a metal plate terminal attached thereto were provided on the rubber plate side, and a fixing washer was inserted from the end of the rivet from the insulating plate side to fix the external terminal to the sealing plate.
The case used was a cylindrical shape having a diameter of 40 mm, a height of 80 mm, and a wall thickness of 0.5 mm and having an open port on one side. As shown in FIG. 1, the groove-shaped explosion-proof valve has a groove length of 10 mm, a groove width of 0.3 mm, a groove depth of 0.35 mm, and the left side of the groove portion from the groove depth direction. The thickness of one case around the groove was reduced by processing into a tapered shape inclined at 60 degrees.
Next, the anode foil is manufactured by processing an aluminum foil having a thickness of about 100 μm. That is, the aluminum foil is roughened by direct current and chemical etching. After roughening, boil in pure water. After boiling, a chemical film is formed by applying a direct current voltage of 600 V in a boric acid chemical liquid. After the chemical conversion treatment, phosphoric acid treatment is performed for stabilization, followed by baking at a temperature of 550 ° C. After the firing treatment, it is cut into a size of 40 mm in width and 3000 mm in length to obtain an anode foil.
The lead foil for the anode is an aluminum foil having a thickness of 150 μm, a width of 5 mm, and a length of 60 mm that has been subjected to a chemical conversion treatment of 600 V without etching. The anode lead foil is connected to the anode foil by cold welding.
As the cathode foil, an aluminum foil having a thickness of 30 μm is etched and phosphoric acid-treated, and about 200 μF / cm 2 is used. The cathode foil is cut into a size of 40 mm in width and 3050 mm in length.
The cathode lead foil is manufactured by rolling an aluminum foil to a length of 150 μm and a width of 1000 mm, then annealing, cutting to a width of 500 mm, and further cutting to a size of 5 mm. The cathode lead foil is connected to the cathode foil by cold welding.
As the electrolytic paper, paper having a width of 50 mm was used, and kraft paper having a thickness of 60 μm and a density of 0.75 g / cm 3 was used.
An anode foil and a cathode foil were laminated through this electrolytic paper and wound to form a capacitor element. Thereafter, an organic acid electrolyte solution of ethylene glycol and ammonium 2-butyloctanedioate was impregnated.
After impregnating the electrolytic solution, holes for inserting rivets are made in the end portions of the anode lead foil and the cathode lead foil drawn out from the capacitor element, and the anode terminal and the cathode terminal provided through the sealing plate, respectively. Connected. After the connection, the capacitor element was stored in the case. After storage, a sealing plate was attached to the end of the case, and the case was sealed. After the case was sealed, it was left in an atmosphere at a temperature of 85 ° C. and a voltage of 425 V was applied for aging treatment.
（比較例１）
比較例１では、図２に示すように、溝状の防爆弁３は、溝部周辺の左右どちらもケースの肉厚を薄くしないとし、それ以外は、実施例１と同様にしてアルミニウム電解コンデンサを作成した。
図２は、比較例１の蓄電デバイスとその防爆弁のところの断面図を示していて、図２（ａ）は、アルミニウム電解コンデンサを、図２（ｂ）は、その防爆弁のところのＢ−Ｂ’断面図を模式的に示している。図２（ａ）に示すように、外観的には図１（ａ）と同じで、図２（ｂ）に示すように、溝状の防爆弁３を設けていて、溝部周辺の左右どちらにもケースの肉厚が薄くなっていない。
(Comparative Example 1)
In Comparative Example 1, as shown in FIG. 2, the groove-shaped explosion-
2 shows a cross-sectional view of the electricity storage device of Comparative Example 1 and its explosion-proof valve. FIG. 2 (a) shows an aluminum electrolytic capacitor, and FIG. 2 (b) shows B at the explosion-proof valve. -B 'is a schematic cross-sectional view. As shown in FIG. 2 (a), the external appearance is the same as in FIG. 1 (a), and as shown in FIG. 2 (b), a groove-shaped explosion-
（比較例２）
比較例２では、溝状の防爆弁３は、図３に示すように、溝部の両側を溝の深さ方向から６０度傾けたテーパー状にして溝部周辺の両方の部分においてケースの肉厚を薄くした以外、実施例１と同様にしてアルミニウム電解コンデンサを作成した。
図３は、比較例２の蓄電デバイスとその防爆弁のところの断面図を示していて、図３（ａ）は、アルミニウム電解コンデンサを、図３（ｂ）は、その防爆弁のところのＣ−Ｃ’断面図を模式的に示している。図３（ａ）に示すように、外観的には図１（ａ）と同じで、図３（ｂ）に示すように、溝状の防爆弁３を設けていて、溝部周辺の左右どちらもケースの肉厚が薄くなっている。
(Comparative Example 2)
In Comparative Example 2, as shown in FIG. 3, the groove-shaped explosion-
3 shows a cross-sectional view of the electricity storage device of Comparative Example 2 and its explosion-proof valve. FIG. 3 (a) shows an aluminum electrolytic capacitor, and FIG. 3 (b) shows C at the explosion-proof valve. -C 'sectional drawing is shown typically. As shown in FIG. 3 (a), the appearance is the same as in FIG. 1 (a), and as shown in FIG. 3 (b), a groove-shaped explosion-
実施例１、比較例１および比較例２の試料数は各４０個とした。圧力０．９ＭＰで弁作動するようにしたときの、溝部の深さ、併せて溝部底壁の厚みと、その深さに設定したときの動作不良の割合を比較し、結果を表１に示す。 The number of samples in Example 1, Comparative Example 1 and Comparative Example 2 was 40 each. Table 1 compares the depth of the groove when the valve is operated at a pressure of 0.9 MP, the thickness of the bottom wall of the groove, and the ratio of malfunction when set to that depth. .
表１から、実施例では、比較例と比べ、溝部の深さを浅くでき、溝部底壁の厚みを厚くできるので、ケースのふくれ以外の理由たとえば振動などで溝部に亀裂が発生してしまう恐れが少ない。また、溝部の深さの浅い実施例の加工では、比較例と比べ、溝部底壁の厚みのばらつきが少なく、弁作動精度も良好な結果を得た。 From Table 1, since the depth of a groove part can be made shallow compared with a comparative example and the thickness of a groove part bottom wall can be made thick from Table 1, a crack may generate | occur | produce in a groove part for reasons other than a case blister, such as vibration. Less is. Further, in the working of the example with the shallow groove part, the variation in the thickness of the bottom wall of the groove part was small and the valve operation accuracy was good as compared with the comparative example.
上記の試験結果から、比較例１は、図２（ｃ）に示すように、溝部周辺の左右どちらの部分も変形に差がなく、内部圧力が問題圧力に上昇した場合に、ケース径が増加しながら、ケース外側に押し広げるように変形するが、ケースの厚さが厚い場合にはケース径が増加しにくくそのため、容易には溝部がさけにくい。そのため、迅速に防爆弁機能が動作するには、ケースの厚さに対して十分深い溝を設ける必要があり、溝部底壁の厚みをより薄くする必要がある。
また、比較例２は、比較例１と比べ、溝部周辺の左右どちらもケースの肉厚が薄くなっているので、内部圧力が問題圧力に上昇した場合には、溝部周辺がケース外側に押し広げるようには変形し易くなるが、図３（ｃ）に示すように、溝部周辺の左右どちらの部分も変形に差がないため、ケース外側に押し広げるように変形しても、容易には溝部がさけにくい。また、内部圧力が問題圧力に上昇した場合にケース径を増加させようと、ケースの円周方向に伸びる方向に変形するが、溝部周辺の左右どちらもケースの肉厚が薄くなっていると溝部に伸びが集中できにくいため、溝部がさけにくくなってします。そのため、迅速に防爆弁機能が動作するには、ケースの厚さに対して十分深い溝を設ける必要があり、溝部底壁の厚みを薄くする必要がある。
From the above test results, in Comparative Example 1, as shown in FIG. 2 (c), there is no difference in deformation in the left and right portions around the groove, and the case diameter increases when the internal pressure rises to the problem pressure. However, the case is deformed so as to spread outward, but when the thickness of the case is thick, the case diameter is difficult to increase, and therefore the groove portion is not easily avoided. Therefore, in order for the explosion-proof valve function to operate quickly, it is necessary to provide a groove sufficiently deep with respect to the thickness of the case, and it is necessary to make the thickness of the groove bottom wall thinner.
In Comparative Example 2, compared with Comparative Example 1, the case thickness is thin on both the left and right sides of the groove portion. Therefore, when the internal pressure rises to the problem pressure, the periphery of the groove portion is pushed outward to the case. However, as shown in FIG. 3C, there is no difference in deformation between the left and right portions around the groove portion. Hard to avoid. Also, when the internal pressure rises to the problem pressure, the case diameter is increased and the case is deformed in the direction extending in the circumferential direction. However, if the case thickness is thin on both the left and right sides of the groove, the groove Since it is difficult to concentrate the elongation, the groove is difficult to avoid. Therefore, in order for the explosion-proof valve function to operate quickly, it is necessary to provide a groove that is sufficiently deep with respect to the thickness of the case, and it is necessary to reduce the thickness of the bottom wall of the groove.
１…ケース、２…外部端子、３…溝状の防爆弁、４…薄厚部分
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| JP2021118321A (en) * | 2020-01-29 | 2021-08-10 | 株式会社アプトデイト | Capacitor case and manufacturing method of the same |
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