TWI240937B

TWI240937B - Electrolytic capacitor

Info

Publication number: TWI240937B
Application number: TW93133008A
Authority: TW
Inventors: Koichiro Take
Original assignee: Showa Denko Kk
Priority date: 2003-10-29
Filing date: 2004-10-29
Publication date: 2005-10-01

Abstract

In an electrolytic capacitor 1 in which a capacitor element 2 is enclosed in an external casing 3, a heat conductive material 5 having heat conductivity of 1 W/m.K or more is disposed between the external casing 3 and the capacitor element 2 so as to be in contact with them. Alternatively, in an electrolytic capacitor 1 in which a capacitor element 2 is enclosed in an external casing 3 made of aluminum, an external peripheral surface of the external casing 3 is covered with an insulation film 4.

Description

1240937 ⑴ 九、發明說明本申請案係伴隨於2003年10月29日提出的日本國特許申請案2003-369034號、2003年10月29日提出的曰本國特許申請案2003-369036號、2003年12月24日提出的日本國特許申請案2003-426354號、2003年12月 24日提出的日本國特許申請案2003-426356號、2003年 Η月4日提出的美國暫時申請案60/516834號及2003年 11月4日提出的美國暫時申請案60/516766號之優先權主張者，該等之揭示內容係原樣地構成本申請案之一部分。【發明所屬之技術領域】本發明係關於一種利用於電子機器等之中散熱性優異的電解電容器。而，在本說明書中，「鋁」之用語係包含鋁及其合金之意。【先前技術】電解電容器方面，大多使用在有底圓筒狀之外裝殼體內容納有電容器元件，且在該電容器元件上設置有電極端子之構成。該電解電容器在長時間地施加波紋電流、或施加大電流之時，會使被收容於其內部的電容器元件發熱。並且，電解電容器之尺寸變成大型之時，電容器元件的發熱量也隨之更增大。因而電容器元件發熱而使其溫度上昇之時，會產生介電損耗正切（dielectric loss tangent)之 -4- (2) 1240937 增大、或靜電容量之減少等之電氣諸特性劣化，更使電容器的耐用壽命縮短的問題。因而，爲了解決此種問題，習知上已提案有可抑制電容器元件之溫度上昇之電解電容器。例如，在電容器元件的端面上連接有金屬製集電端子的電解電容器被提案（參照特許文獻1)。並且，在電容器元件的卷芯部上連接有熱管之吸熱部，且在導出於外部的熱管之散熱部上連接有散熱鰭片或熱沉（heat sink)之構造的電解電容器亦被提案（參照特許文獻2〜3 )。並且’亦揭示有：在有底圓筒狀之外裝殼體內容納有電容器元件的電解電容器中，採用在外裝殻體與電容器元件之間的空隙中充塡有矽油之構成之時，可使電解電容器的散熱特性提高（參照特許文獻4 )。特許文獻1:日本特開2000-77268號公報（申請專利範圍第1項）特許文獻2 :日本特開平丨丨_ 3 2 9 8 9 9號公報（申請專利範圍第1項、第1圖）特許文獻3:日本特開平〗1_176697號公報（申請專利範圍第1及2項、第1圖）特許文獻4 :日本特開200Π 1〇479號公報（申請專利範圍第1項）然而’在上述特許文獻1〜3所記載的電解電容器中，有製作设計變更後之電容器元件本身或內部構造本身的電解電容器的需要，因而有製造成本高之困難點。 -5 - (3) 1240937 並且，在外裝殼體方面，雖然一般係使用樹脂（高分子）殼體或金屬製殼體（參照特許文獻1之段落 0 0 1 8 )，採用合成樹脂殼體之時，合成樹脂的熱傳導性小，因此該合成樹脂之存在反而成爲散熱性之阻礙。並且，採用金屬製殻體之時，一般爲了確保與外部的絕緣性，雖然如第3圖所示在金屬製殼體（1 〇〇 )的外側裝設有合成樹脂外套（1 〇 1 )(例如參照特許文獻4 )，但是在金屬製殻體（100)與合成樹脂外套（101)之間有薄的空氣層（隔熱層）存在’因此同樣地會妨礙散熱性。另一方面，在上述特許文獻4所記載的電解電容器中，不需要將電容器元件本身或內部構造本身做設計變更，此點非常有利，但是其散熱性能則無法充分滿足。尤其近年來，在電動汽車、燃料電池車、太陽光發電系統、產業用電源等之中，適用於其變頻電路或AC伺服馬達驅動電路的電解電容器方面，雖然被要求具有在大電流施加時或高波紋電流施加時所產生的熱可在効率良好的情況下被排放到外部之優異散熱特性的電解電容器，但是上述特許文獻4所記載的技術不一定能夠因應於此種要求。本發明係鑑於相關的先前技術而進行開發者，其目的在提供一種電解電容器，除了可廉價地製造之外，且散熱性優異，尤其即使在大電流或高波紋電流施加時所產生的熱可在効率良好的情況下被排放到外部之優異散熱特性的電解電容器。本發明之其它目的可由以下顯示的本發明之實施形態 -6 - (4) 1240937 而了解。【發明內容】爲了達成上述目的，本發明提供以下之手段。 [1 ] 一種電解電容器’其係針對於將電容器元件收容於外裝殼體內的電解電容器，其特徵爲在上述外裝殻體與上述電容器元件之間介裝有與其等爲接觸狀態之熱傳導率爲1 W/m · K以上之熱傳導材。 [2 ]如前項1中所記載的電解電容器，其中在上述熱傳導率爲1 W/m · K以上之熱傳導材方面，係使用由鋁微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，而擴散於基體材中製成的熱傳導材。 [3 ]如前項1中所記載的電解電容器，其中在上述熱傳導率爲1 W/m · K以上之熱傳導材方面，係使用將鋁微粒擴散到基體材中而製成的熱傳導材。 [4] 如前項2或3中所記載的電解電容器，其中上述微粒的平均粒徑爲0.5〜5μηι。 [5] 如前項2或3中所記載的電解電容器，其中上述熱傳導材中上述微粒之含有率係爲7 0質量％以上。 [6] 如前項2或3中所記載的電解電容器，其中上述基體材方面，係使用矽油或/及變性矽油。 [7] 如前項2或3中所記載的電解電容器’其中上述基體材方面，係使用合成樹脂。 -7- (5) 1240937 [8] 如前項7中所記載的電解電容器，其中上述合成樹脂爲使用聚烯烴。 [9] 如前項8中所記載的電解電容器，其中上述聚烯烴方面，係使用聚丙烯或/及聚乙烯。 [1 〇]如前項1〜3之任何一項中所記載的電解電容器，其中上述電容器元件之高度的3〇%以上係與上述熱傳導材爲接觸狀態。 [11]如前項1〜3之任何一項中所記載的電解電容器，其中上述外裝殼體係爲鋁製。 [1 2 ]如前項1〜3之任何一項中所記載的電解電容器，其係爲鋁製電解電容器。 [13]如前項1〜3之任何一項中所記載的電解電容器，其中上述電容器元件係由隔離件介裝於陽極箔與陰極箔之間而繞捲所形成者。 [1 4] 一種電解電容器，其係針對於將電容器元件收容於鋁製之外裝殼體內的電解電容器，其特徵爲上述外裝殻體之外周面，係以絕緣皮膜而被覆。 [15] 如前項1 4中所記載的電解電容器，其中上述絕緣皮膜係爲氧化鋁皮膜。 [16] 如前項1 4中所記載的電解電容器，其中上述絕緣皮膜係爲氮化鋁皮膜。 [1 7] —種電解電容器，其係針對於將電容器元件收容於鋁製之外裝殼體內的電解電容器，其特徵爲上述外裝殼體之外周面，係以表面處理而形成的陽極氧化皮膜而被 -8- (6) 1240937 [18] —種電解電容器，其係針對於將電容器元件收容於鋁製之外裝殼體內的電解電容器，其特徵爲上述外裝殼體之外周面，係以表面氮化處理而形成的氮化銘皮膜而被覆。 [1 9 ]如前項1 4〜1 8之任何一項中所記載的電解電容器，其中上述皮膜的厚度係爲1〜20 μιη。 [20] 如前項14〜18之任何一項中所記載的電解電容器，其中在上述外裝殻體與上述電容器元件之間介裝有與其等爲接觸狀態之熱傳導率爲1 W/m · Κ以上之熱傳導材。 [21] 如前項20中所記載的電解電容器，其中在上述熱傳導率爲1 W/m · K以上之熱傳導材方面，係使用由鋁微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，擴散於基體材中製成的熱傳導材。 [22] 如前項20中所記載的電解電容器，其中在上述熱傳導率爲1 W/m · K以上之熱傳導材方面，係使用將鋁微粒擴散到基體材中而製成的熱傳導材。 [23] 如前項21或22中所記載的電解電容器，其中上述微粒的平均粒徑爲0·5〜5 μηι。 [24] 如前項21或22中所記載的電解電容器，其中上述熱傳導材中上述微粒之含有率係爲70質量°/。以上。 [2 5 ]如前項2 1或2 2中所記載的電解電容器’其中 -9- 1240937 上述基體材方面，可使用矽油或/及變性矽油。 [26] 如前項21或22中所記載的電解電容器，其中上述基體材方面，可使用合成樹脂。 [27] 如前項26中所記載的電解電容器，其中上述合成樹脂爲使用聚烯烴。 [2 8]如前項27中所記載的電解電容器，其中上述聚烯烴方面，係使用聚丙烯或/及聚乙烯。 [29] 如前項20〜22之任何一項中所記載的電解電容器，其中上述電容器元件之高度的30 %以上係與上述熱傳導材爲接觸狀態。 [30] 如前項14〜18之任何一項中所記載的電解電容器，其係爲鋁製電解電容器。 [3 1]如前項14〜18之任何一項中所記載的電解電容器’其中上述電容器元件係由隔離件介裝於陽極范與陰極箔之間而繞捲所形成者。在Π]之發明中，在外裝殼體與電容器元件之間介裝有與其等爲接觸奘狀態之熱傳導率爲1 w/m · K以上之熱傳導材’因此在電容器元件產生的熱介由該熱傳導材而効率良好地傳熱到外裝殼體且散熱到外部，故可防止電容器元件變成高溫，因而可提供耐用壽命長的電解電容器。並且’因爲散熱性優異，因此即使大電流或高波紋電流施加之時’亦可充分地抑制電容器元件之溫度上昇。並且，僅在外裝殼體與電容器元件之間介裝有上述特定的熱傳導材而可提高散熱性，因此不需要將電容器元件本身或內部構 -10- (8) 1240937 造本身做設計變更，故可廉價地製造。在[2 ]之發明中，熱傳導材方面，係使用由鋁微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，擴散於基體材中製成的熱傳導材，即使用將熱傳導性優異的特定化合物擴散到基體材中的熱傳導材之故，因此在電容器元件產生的熱介由該熱傳導材而効率良好地傳熱到外裝殼體且散熱到外部，故可更有效地防止電容器元件變成高溫。在[3 ]之發明中，熱傳導材方面，係使用將鋁微粒擴散到基體材中而製成的熱傳導材，因此在電容器元件產生的熱介由該熱傳導材而効率更良好地傳熱到外裝殼體且散熱到外部，故可更有效地防止電容器元件變成高溫。在[4]之發明中，微粒的平均粒徑爲〇·5〜5μιη之故，因此可使電解電容器的散熱性更被提高。在[5 ]之發明中，熱傳導材中上述微粒之含有率係設定爲70質量％以上，因此可在更低成本下使電解電容器的散熱性更被提高。在[6]之發明中，基體材方面，係使用矽油（包含變性矽油）之故’可使電解電容器的散熱性更被提高。在[7]之發明中，基體材方面，係使用合成樹脂之故’因此可在更低成本下使電解電容器的散熱性更被提商。在[8 ]之發明中，上述合成樹脂方面爲使用聚烯烴之故，可使電解電容器的散熱性更被提高。 -11 - (9) 1240937 在[9]之發明中，上述聚烯烴方面係使用聚丙烯聚乙烯之故，因此除了低成本以外，由於未含有鹵素環境亦可充分地顧及。在[10]之發明中，電容器元件之高度的30 %以上上述熱傳導材爲接觸狀態之故，因此可確保充分的優熱性。在[1 Π之發明中，外裝殼體係爲鋁製之故，因此成輕量化，且亦可使電解電容器的散熱性更被提高。在[1 2]之發明中，可提供具有優異散熱特性的鋁解電容器。在[13]之發明中，可提供具備有充分的靜電容量有優異散熱特性的電解電容器。在[1 4]之發明中，外裝殼體係以熱傳導性優異的成，且絕緣皮膜係一體地被覆在外裝殼體上，在其等未介入有空氣層之故，因此在電容器元件產生的熱可該外裝殼體及絕緣皮膜而効率良好地散熱到外部。從可防止電容器元件變成高溫，因而可提供耐用壽命長解電容器。因爲散熱性優異，因此即使大電流或高波流施加之時，亦可充分地抑制電容器元件之溫度上昇且5僅在外裝殻體的外周面上形成絕緣皮膜，因此可與外部的絕緣性。並且，僅在外裝殼體的外周面上被形成絕緣皮膜，而可提高散熱性，因此不需要將電容件本身或內部構造本身做設計變更，故可廉價地製造在[15]之發明中，絕緣皮膜係由氧化鋁皮膜所形或/及，對係與異散可達製電且具鋁構之間介由而，的電紋電。並確保覆地器元〇成之 (10) 1240937 故，因此可確保與外部的絕緣性。在[1 6]之發明中，絕緣皮膜係由氮化鋁皮膜所形成之故，因此可確保與外部的絕緣性。在[1 7]之發明中，外裝殼體係以熱傳導性優異的鋁構成，且陽極氧化皮膜係一體地被覆在外裝殼體上，在其等之間未介入有空氣層之故，因此在電容器元件產生的熱可介由該外裝殼體及陽極氧化皮膜而効率良好地散熱到外部。從而，可防止電容器元件變成高溫，因而可提供耐用壽命長的電解電容器。因爲散熱性優異，因此即使大電流或高波紋電流施加之時，亦可充分地抑制電容器元件之溫度上昇。並且，與外部之絕緣用的皮膜係由陽極氧化皮膜所形成，因此可確保與外部的絕緣性。並且，該陽極氧化皮膜係在外裝殼體的外周面上以表面處理所形成者，因而可充分地確保外裝殼體與陽極氧化皮膜之接合強度，因此可提供陽極氧化皮膜不剝離的耐久性優異之電解電容器。加上，僅在外裝殼體之外周面上被覆地形成陽極氧化皮膜，而可提高散熱性，因此不需要將電容器元件本身或內部構造本身做設計變更，故可廉價地製造。在[1 8]之發明中，外裝殼體係以熱傳導性優異的鋁構成，且氮化鋁皮膜係一體地被覆在外裝殻體上，在其等之間未介入有空氣層之故，因此在電容器元件產生的熱可介由該外裝殼體及氮化鋁皮膜而効率良好地散熱到外部。從而，可防止電容器元件變成高溫，因而可提供耐用壽命長的電解電容器。因爲散熱性優異，因此即使大電流或高波 -13- (11) 1240937 紋電流施加之時，亦可充分地抑制電容器元件之溫度上昇。並且’與外部之絕緣用的皮膜係由氮化鋁所形成，因此可確保與外部的絕緣性。並且，該氮化鋁係在外裝殼體的外周面上以表面氮化處理所形成者，因而可充分地確保外裝殼體與氮化鋁皮膜之接合強度，因此可提供氮化鋁不剝離的耐久性優異之電解電容器。加上，僅在外裝殼體之外周面上被覆地形成氮化鋁皮膜，而可提高散熱性，因此不需要將電容器元件本身或內部構造本身做設計變更，故可廉價地製造。在[1 9]之發明中，可充分地確保與外部的絕緣性、且可確保優異的散熱性。在[2 0]之發明中，在外裝殼體與電容器元件之間介裝有與該等爲接觸奘狀態之熱傳導率爲1 W/m · K以上之熱傳導材，因此在電容器元件產生的熱介由該熱傳導材而効率良好地傳熱到外裝殼體，故可使電解電容器的散熱特性更進一步地提高。在[2 1 ]之發明中，熱傳導材方面，係使用由鋁微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，擴散於基體材中製成的熱傳導材，即使用將熱傳導性優異的特定化合物擴散到基體材中的熱傳導材之故，因此在電容器元件產生的熱介由該熱傳導材而効率更良好地傳熱到外裝殼體，故可使電解電容器的散熱特性更進一步地提高。在[2 2 ]之發明中，熱傳導材方面，係使用將銘微粒擴 (12) 1240937 散到基體材中而製成的熱傳導材，因此在電容器元件產生的熱介由該熱傳導材而効率更良好地傳熱到外裝殼體。在[2 3 ]之發明中，微粒的平均粒徑爲〇 . 5〜5 μ m之故’ 因此可使電解電容器的散熱性更被提高。在[24]之發明中，熱傳導材中上述微粒之含有率係設定爲70質量％以上，因此可在更低成本下使電解電容器的散熱性更被提高。在[25]之發明中，基體材方面，係使用矽油（包含變性矽油）之故，可使電解電容器的散熱性更被提高。在[2 6]之發明中，基體材方面，係使用合成樹脂之故，因此可在更低成本下使電解電容器的散熱性更被提局。在[27]之發明中，上述合成樹脂方面爲使用聚烯烴之故，可使電解電容器的散熱性更被提高。在[28]之發明中，上述聚烯烴方面係使用聚丙烯或/ 及聚乙烯之故，因此除了低成本以外，由於未含有鹵素，對環境亦可充分地顧及。在[2 9]之發明中，電容器元件之高度的30%以上係與上述熱傳導材爲接觸狀態之故，因此可確保充分的優異散熱性。在[3 0]之發明中，可提供具有優異散熱特性的鋁製電解電容器。在[31]之發明中，可提供具備有充分的靜電容量且具有優異散熱特性的電解電容器。 -15- (13) 1240937 【實施方式】本發明之電解電容器，只要必須有散熱性的電容器的話，無論何種均可，例如可爲使用閥作用金屬的電容器、陶瓷電容器、薄膜電容器、苯乙烯電容器等。其中以使用閥作用金屬的電容器較佳，鋁電解電容器、鉅質電容器、鈮系（包含鈮氧化物）電容器更佳。上述使用閥作用金屬的電容器，係在其金屬表面上產生的氧化物皮膜，僅具有可使電流朝一個方向流動，而在相反方向上則非常難流動的特性，即具有整流作用的氧化皮膜者。其次，第1發明之一個實施形態之電解電容器（1 ) 的縱剖面圖被顯示於第1圖中。該電解電容器（1 )係爲鋁電解電容器，其具備有：電容器元件（2)、收容該電容器元件（2)之有底圓筒狀之外裝殼體（3)、將該外裝殼體（3 )之上面開口部封口之電氣絕緣性之封口構件 (6 )、貫通該封口構件（6 )而配置的一對電極端子 (7) (7)、及連接該電極端子（7)之下端部及電容器元件（2 )之導線（8 )。又，在上述外裝殼體（3 )與上述電容器元件（2 )之間的空隙中介裝有與該等爲接觸狀態的熱傳導率爲1 W/m · K以上之熱傳導材（5 )。在該電解電容器（1)中，於電容器元件（2)產生的熱介由上述熱傳導材（5 )而効率良好地傳熱到外裝殼體（3 )上，並散熱到外部，因此可防止電容器元件（2 )變成高溫，因而成爲耐用壽命長的電解電容器。因而，散熱性很優異之 -16- (14) 1240937 故’因此即使大電流或高波紋電流施加之時，亦可充分地抑制電容器元件（2 )之溫度上昇。上述電容器元件（2 )係由隔離件介裝於陽極箔與陰極箔之間而繞捲所形成者。並且，在上述電容器元件 (2 )中含浸有電解液。上述外裝殼體（3)方面，較佳爲使用金屬製者，尤其更佳爲鋁製者。使用鋁製者之時，可達成輕量化，且亦可使電解電容器（1 )之散熱効率提高。上述熱傳導率爲1 W/m · K以上之熱傳導材方面，較佳係使用由鋁微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，擴散於基體材中製成的熱傳導材，此時，在電容器元件（2 )產生的熱可介由熱傳導材（5 )而効率更良好地傳熱到該外裝殼體（3 )，並散熱到外部。從而，可更有効果地防止電容器元件（2 )變成高溫。其中，熱傳導材（5 )方面，更佳爲使用將鋁微粒擴散到基體材中而製成的熱傳導材，此時，可更有効果地防止電容器元件（2 )變成高溫。上述微粒的平均粒徑係爲0.5〜5 μηι之範圍較佳。未滿 0.5 μιη時，在基體材中微粒有容易凝集之虞，因此較不爲採用。另一方面，超過5μηι之時，會使基體材中微粒的擴散穩定性降低，微粒在基體材中恐有容易沉澱之虞，因而，在電容器元件（2 )產生的熱難以効率良好地傳熱到該外裝殼體（3 )，因而此較不採用。其中上述微粒的平均粒徑亦以1〜4 μηι之範圍更佳。 -17- (15) 1240937 上述熱傳導材（5 )中上述微粒之含有率’較佳係設定爲7 〇質量％以上。未滿7 0質量％之時，恐有難以獲得優異的散熱性能，因而較不採用。上述微粒之含有率的上限較佳係爲9 0質量％以下’超過9 0質量％之時’會使流動性惡化，恐有降低熱傳導性之虞’因而較不採用。上述基體材方面，雖然沒有特別限定’但是例如矽油之外，較佳尙可使用烷基變性矽油、環氧基變性砂油等之變性矽油。其中以使用變性矽油更佳。此時’基體材中的熱對流具有可熱傳導的促進効果’因而可使電解電容器 (2 )的散熱性更被提高。上述基體材方面，除了上述例示之化合物以外，亦可使用例如脂肪族系樹脂（聚烯烴等）、不飽和聚酯樹脂、壓克力樹脂、變性壓克力樹脂、乙烯基酯、環氧樹脂、矽樹脂等之合成樹脂。上述合成樹脂亦可爲低分子量體，亦可爲高分子量體。並且，上述合成樹脂可爲油狀、橡膠狀、硬化物之任何一種。在該等上述合成樹脂中，以使用聚烯烴較佳，更佳的樹脂爲聚丙烯、聚乙烯。在該第1發明中，雖然上述熱傳導材（5 )係介裝於上述外裝殼體（3 )與電容器元件（2 )之間，但是此時熱傳導材（5 )之充塡高度係爲電容器元件（2 )之高度的 3 0 %以上而被構成之時較佳。即，電容器元件（2 )之高度的30%以上與上述熱傳導材（5 )爲接觸狀態被構成之時較佳。採用此構成時可確保充分的優異散熱性。其次，第2發明之一個實施形態的電解電容器（1 ) -18- (16) 1240937 之剖面圖被顯示於第2圖中。該電解電容器（])係爲鋁電解電容器’其具備有：電容器元件（2)、收容該電容器元件（2 )之有底圓筒狀之鋁製外裝殼體（3 )、在該外裝殼體（3 )之外周面上被覆形成的絕緣皮膜（4 )、將該外裝殻體（3 )之上面開口部封口之電氣絕緣性之封口構件（6 )、貫通該封口構件（6 )而配置的一對電極端子 (7 ) ( 7 )、及連接該電極端子（7 )之下端部及電容器元件（2 )之導線（8 )。上述絕緣皮膜（4 )，係使空氣層不存在於該外裝殼體（3)之外周面上，而一體地被覆。上述電容器元件（2)係由隔離件介裝於陽極箔與陰極箔之間而繞捲所形成者。並且，在上述電容器元件 (2 )中含浸有電解液。在該電解電容器（1 )中’外裝殼體（3 )係由熱傳導性優異的鋁所構成，且絕緣皮膜（4 )係與外裝殼體（3 ) 成一體地被覆’在其等之間不存在有空氣層之故，於電容器元件（2 )產生的熱介由該外裝殼體（3 )及絕緣皮膜 (4 )而効率良好地散熱到外部，因此可防止電容器元件 (2)變成局溫。並且，在外裝殼體（3)之外周面上形成絕緣皮膜（4 )之故，亦可確保與外部之絕緣性。又’在本貫施形態中係採用，在上述外裝殻體（3 ) 與上述電容器兀件（2 )之間的空隙中介裝有與該等爲接觸狀態的熱傳導率爲1 W/m · K以上之熱傳導材（5 )的構成之故，在電容器元件（2 )產生的熱介由上述熱傳導材 (5 )而効率良好地傳熱到外裝殻體（3 )上，因而可使電 -19- (17) 1240937 解電容器（i )之散熱性能更進一步地提高。在該第2發明中，較佳爲上述絕緣皮膜（4 )之厚度被設定爲1〜20μπι。未滿Ιμηι時，與其它物體之接觸等會有絕緣皮膜容易剝落，因而無法確保與外部的絕緣性之顧慮，因此較不採用，超過20μιη時’絕緣皮膜（4 )本身變成熱阻抗，因而有散熱性降低之虞’因此較不採用。其中，上述絕緣皮膜（4 )之厚度被設定爲3〜ΙΟμηι之時更佳。上述絕緣皮膜（4 )方面，雖然並未特別限定，但是以氧化鋁皮膜或氮化鋁皮膜較佳。以氧化鋁皮膜或氮化鋁皮膜構成之時，具有與外部確實地絕緣之優點。並且，上述絕緣皮膜（4 )方面，另外亦可使用將具有絕緣性之塗料塗佈而形成的皮膜。並且，亦可將此種絕緣性塗料塗佈於上述氧化鋁皮膜或氮化鋁皮膜之上，而使絕緣性塗料皮膜更進一步積層一體化。上述氧化鋁皮膜（4 )，係在上述鋁製外裝殻體（3 ) 之外周面，使用表面處理（例如陽極氧化處理等），而使上述外裝威體（3)之外周面上不存在有空氣層的方式，一體地被覆而形成。以該表面處理形成之時，可充分地獲得外裝殼體（3 )與氧化鋁皮膜（4 )之接合強度。並且，上述氮化鋁皮膜（4)，係在上述外裝殻體 (3 )之外周面，使用表面氮化處理（在氮氣環境下之加熱處理等），而使上述外裝殼體（3 )之外周面上不存在有空氣層的方式’一體地被覆而形成。以該表面氮化處理 -20- (18) 1240937 形成之時’可充分地獲得外裝殼體（3 )與氮化鋁皮膜 (4 )之接合強度。而’在上述實施形態中，雖然上述絕緣皮膜（4 )係在上述外裝殻體（3)之外周面上全面地被覆形成，但是並不特別限定於此種構成，亦可採用將上述絕緣皮膜 (4 )在上述外裝殼體（3 )之外周面的局部上被覆地形成之構成。但是，從散熱性提高的觀點，以上述絕緣皮膜 (4)在上述外裝殻體（3)之外周面上全面地被覆形成之時較佳。在該第2發明中，上述熱傳導率爲1 w/m · K以上之熱傳導材方面，可使用與第丨發明同樣的材料。即，上述熱傳導率爲1 W / m · K以上之熱傳導材方面，可使用由銘微粒、氮化鋁微粒、氮化硼微粒及氧化鋅微粒所形成的群中選出的一種或二種以上的微粒，擴散於基體材中製成的熱傳導材較佳，此時，在電容器元件（2 )產生的熱可介由熱傳導材（5 )而効率更良好地傳熱到該外裝殻體 (3 )，並散熱到外部。從而，可更有効果地防止電容器元件（2 )變成高溫。其中，熱傳導材（5 )方面，更佳爲使用將鋁微粒擴散到基體材中而製成的熱傳導材，此時，可更有効果地防止電容器元件（2 )變成高溫。上述微粒的平均粒徑係爲〇·5〜5 μηι之範圍較佳。該範圍之微粒爲較佳之理由，係與上述第1發明所列舉的理由相同。其中上述微粒的平均粒徑亦以】〜4 μιη之範圍更佳。並且，上述熱傳導材（5 )中上述微粒之含有率，較 -21 - (19) 1240937 佳係設定爲7 〇質量％以上。未滿7 0質量％之時’恐有難以獲得優異的散熱性能，因而較不採用。上述微粒之含有率的上限較佳係爲9 0質量％以下，超過9 0質量°/。之時’ 會使流動性惡化，恐有降低熱傳導性之虞’因而較不採用。上述基體材方面，雖然沒有特別限定，但是例如矽油之外，較佳尙可使用烷基變性矽油、環氧基變性矽油等之變性矽油。其中以使用變性矽油更佳。此時，基體材中的熱對流具有可熱傳導的促進効果，因而可使電解電容器 (2 )的散熱性更被提高。上述基體材方面，除了上述例示之化合物以外，亦可使用例如脂肪族系樹脂（聚烯烴等）、不飽和聚酯樹脂、壓克力樹脂、變性壓克力樹脂、乙烯基酯、環氧樹脂、矽樹脂等之合成樹脂。上述合成樹脂亦可爲低分子量體，亦可爲高分子量體。並且，上述合成樹脂可爲油狀、橡膠狀、硬化物之任何一種。在該等上述合成樹脂中，以使用聚烯烴較佳，更佳的樹脂爲聚丙烯、聚乙烯。在該弟2發明中’雖然上述熱傳導材（5 )係介裝於上述外裝殼體（3 )與電容器元件（2 )之間，但是此時熱傳導材（5 )之充塡高度係爲電容器元件（2 )之高度的 3 0 %以上而被構成之時較佳。即，電容器元件（2 )之高度的3 0%以上與上述熱傳導材（5 )爲接觸狀態被構成之曰寸較izb。採用此構成時可確保充分的優異散熱性。該發明之電解電容器，並不特別限定於上述實施形態 -22- (20) 1240937 而已’可做種種設計變更。例如，在上述實施形態中，雖然一對電極端子（7 )( 7 )被設置於電解電容器之上部位置’但是亦可採用使一方的電極端子被設置於電解電容器之_L部，另一方的電極端子被設置於電解電容器之下部之構成。其次，將說明本發明之具體實施例。 <實施例1〉製作第1圖所示之構成的電解電容器。在製作時，使用氯化乙烯樹脂製者做爲外裝殻體（3 )。並且，熱傳導材（5 )方面，係使用鋁微粒（平均粒徑2.5 μπι ) 8 0質量部分，擴散到環氧變性矽油2 0質量部分中形成的熱傳導材，將該熱傳導材充塡（介裝）到電容器元件（2 )之高度的8 0 %之位置。 <實施例2 > 上述鋁微粒方面，係使用平均粒徑3 · 0 μηι的鋁微粒以外，製成與實施例1同樣的電解電容器。 <實施例3 > 上述鋁微粒方面，係使用平均粒徑1 . 0 μ m的鋁微粒以外，製成與實施例1同樣的電解電容器。 <實施例4〉 - 23- (21) 1240937 上述鋁微粒方面，係使用平均粒徑4 . 〇 μΐΏ的銘微粒以外，製成與實施例1同樣的電解電容器。 <實施例5 > 上述熱傳導材中，係使用鋁微粒含有率爲設定70質量％以外，製成與實施例1同樣的電解電容器。 <實施例6 > 上述熱傳導材中，係使用鋁微粒含有率爲設定8 5質量％以外，製成與實施例1同樣的電解電容器。 <實施例7 > 上述熱傳導材中，係使用鋁微粒含有率爲設定9 0質量％以外，製成與實施例1同樣的電解電容器。 <實施例8 > 上述微粒方面，係使用平均粒徑1 . 5 μηι的氮化鋁微粒取代平均粒徑爲2 · 5 μ m之鋁微粒以外，製成與實施例〗同樣的電解電容器。 <實施例9 > 上述微粒方面，係使用平均粒徑2·0μηι的氮化鋁微粒取代平均粒徑爲2 · 5 μ m之銘微粒以外，製成與實施例1同樣的電解電容器。 -24· (22) 1240937 <實施例1 〇 > 上述微粒方面，係使用平均粒徑2.0 μηι的氧化鋅微粒取代平均粒徑爲2.5 μηι之鋁微粒以外，製成與實施例1同樣的電解電容器。 <實施例1 1 > 使用矽油以取代上述變性矽油以外，製成與實施例1 同樣的電解電容器。 <實施例1 2 > 使用聚丙烯以取代上述變性矽油以外，製成與實施例 1同樣的電解電容器。 <實施例1 3 > 使用聚丙烯以取代上述變性矽油以外，製成與實施例 5同樣的電解電容器。 <實施例1 4 > 使用聚丙烯以取代上述變性矽油以外，製成與實施例 7同樣的電解電容器。 <實施例】5 > 使用聚丙儲以取代上述變性砂油以外，製成與實施例 -25- 124093: 8同樣的電解電容器。 <實施例1 6 > 使用聚丙烯以取代上述變性矽油以外，_成與實施例 9同樣的電解電容器。 <實施例1 7 > 使用聚丙儲以取代上述變性矽油以外，製成與實施例 1 〇同樣的電解電容器。 <實施例’1 8 > 使用聚乙烯以取代上述變性矽油以外，製成與實施例 1同樣的電解電容器。 <比較例1 > 上述熱傳導材方面，係使用變性矽油（未含有鋁微粒者）以外，製成與實施例1同樣的電解電容器。 <比較例2 > 上述熱傳導材方面，係使用聚丙烯（未含有錦@ # 者）以外，製成與實施例1同樣的電解電容器。以下列評價法對上述所獲得的電解電容器進行散_胃性之評價。其結果顯示於表1〜3。 -26 - (24) 1240937 <散熱特性評價法> 在周圍溫度3 5 °C的環境下，於配置電解電容器的狀態，將波紋電流5 A施加於電容器元件上而發熱，測定此時之電容器元件的溫度（最大上昇溫度）。而，電容器元件之溫度測定，係使用熱電偶而進行。1240937 九 IX. Description of the Invention This application is accompanied by Japanese Patent Application No. 2003-369034 filed on October 29, 2003, and Japanese Patent Application No. 2003-369036, filed on October 29, 2003, 2003 Japanese Patent Application No. 2003-426354 filed on December 24, Japanese Patent Application No. 2003-426356 filed on December 24, 2003, and US Provisional Application No. 60/516834 filed on January 4, 2003 And the priority claimant of US Provisional Application No. 60/516766 filed on November 4, 2003, the disclosure content of which constitutes a part of this application as it is. [Technical field to which the invention belongs] The present invention relates to an electrolytic capacitor having excellent heat dissipation properties for use in electronic equipment and the like. In this specification, the term "aluminum" is intended to include aluminum and its alloys. [Prior Art] In electrolytic capacitors, a structure in which a capacitor element is housed in a cylindrical outer case with a bottom and an electrode terminal is provided on the capacitor element is mostly used. When this electrolytic capacitor is subjected to a ripple current for a long period of time or an increased current is applied, it causes the capacitor element housed inside it to generate heat. When the size of the electrolytic capacitor becomes large, the amount of heat generated by the capacitor element also increases. Therefore, when the capacitor element heats and its temperature rises, the electrical characteristics such as an increase in dielectric loss tangent (dielectric loss tangent) -4- (2) 1240937 increase, or a decrease in electrostatic capacity, etc. Reduced durability. Therefore, in order to solve such problems, electrolytic capacitors have been conventionally proposed which can suppress the temperature rise of capacitor elements. For example, an electrolytic capacitor in which a metal collector terminal is connected to an end surface of a capacitor element has been proposed (see Patent Document 1). In addition, an electrolytic capacitor having a structure in which a heat absorbing portion of a heat pipe is connected to a core portion of a capacitor element, and a heat radiating fin or a heat sink is connected to a heat radiating portion of an external heat pipe is also proposed (refer to FIG. Patent documents 2 to 3). In addition, it is also disclosed that, in a electrolytic capacitor having a bottomed cylindrical outer casing containing a capacitor element, when a structure in which a silicone oil is filled in a gap between the outer casing and the capacitor element is used, The heat dissipation characteristics of electrolytic capacitors are improved (see Patent Document 4). Patent Document 1: Japanese Patent Application Laid-Open No. 2000-77268 (Japanese Patent Application No. 1) Patent Document 2: Japanese Patent Application Laid-Open No. 丨丨 _ 3 2 9 8 9 9 (Japanese Patent Application No. 1 and Figure 1) Patent Document 3: Japanese Patent Application Laid-Open No. 1_176697 (Patent Application Nos. 1 and 2 and Figure 1) Patent Document 4: Japanese Patent Application Laid-Open No. 200Π 10479 (Patent Application No. 1) However, 'in the above Among the electrolytic capacitors described in Patent Documents 1 to 3, there is a need to manufacture electrolytic capacitors having a capacitor element itself or an internal structure itself after a design change, and therefore there is a difficulty in that the manufacturing cost is high. -5-(3) 1240937 Also, in terms of exterior casing, although a resin (polymer) casing or a metal casing is generally used (see paragraph 0 0 1 8 of Patent Document 1), a synthetic resin casing is used. In this case, the thermal conductivity of the synthetic resin is small, so the presence of the synthetic resin is an obstacle to heat dissipation. In addition, when a metal case is used, generally, in order to ensure the insulation with the outside, a synthetic resin jacket (101) is attached to the outside of the metal case (100) as shown in FIG. 3 ( For example, refer to Patent Document 4). However, there is a thin air layer (heat-insulating layer) between the metal case (100) and the synthetic resin case (101). Therefore, the heat dissipation property is also impaired. On the other hand, in the electrolytic capacitor described in the aforementioned Patent Document 4, it is not necessary to change the design of the capacitor element itself or the internal structure itself. This is very advantageous, but its heat dissipation performance cannot be fully satisfied. In particular, in recent years, electrolytic capacitors suitable for inverter circuits or AC servo motor drive circuits in electric vehicles, fuel cell vehicles, solar power generation systems, and industrial power supplies have been required to have high current or The electrolytic capacitor having excellent heat dissipation characteristics can be discharged to the outside with high efficiency when high ripple current is applied. However, the technology described in the aforementioned Patent Document 4 may not be able to meet such requirements. The present invention has been developed in view of the related prior art, and an object thereof is to provide an electrolytic capacitor which can be manufactured inexpensively and has excellent heat dissipation properties, and in particular, heat generated when a large current or a high ripple current is applied An electrolytic capacitor with excellent heat dissipation characteristics that is discharged to the outside with good efficiency. Other objects of the present invention can be understood from the embodiment of the present invention shown below-(4) 1240937. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides the following means. [1] An electrolytic capacitor is an electrolytic capacitor for accommodating a capacitor element in an outer case, and is characterized in that a thermal conductivity between the outer case and the capacitor element is in contact with the capacitor element. 1 W / m · K or more of thermal conductive material. [2] The electrolytic capacitor according to the above item 1, wherein the thermally conductive material having a thermal conductivity of 1 W / m · K or more is composed of aluminum fine particles, aluminum nitride fine particles, boron nitride fine particles, and zinc oxide fine particles. One or two or more kinds of particles selected from the formed group are diffused into a heat conductive material made of a base material. [3] The electrolytic capacitor according to the item 1, wherein the heat conductive material having a thermal conductivity of 1 W / m · K or more is a heat conductive material made by diffusing aluminum particles into a base material. [4] The electrolytic capacitor according to the above item 2 or 3, wherein the average particle diameter of the fine particles is 0.5 to 5 µm. [5] The electrolytic capacitor according to the above item 2 or 3, wherein a content ratio of the fine particles in the heat conductive material is 70% by mass or more. [6] The electrolytic capacitor according to the item 2 or 3 above, wherein the base material is a silicone oil or / and a modified silicone oil. [7] The electrolytic capacitor according to the item 2 or 3 above, wherein the base material is a synthetic resin. -7- (5) 1240937 [8] The electrolytic capacitor according to the item 7, wherein the synthetic resin is a polyolefin. [9] The electrolytic capacitor according to the item 8 above, wherein the polyolefin is polypropylene or polyethylene. [10] The electrolytic capacitor according to any one of the foregoing paragraphs 1 to 3, wherein 30% or more of the height of the capacitor element is in contact with the heat conductive material. [11] The electrolytic capacitor according to any one of the above items 1 to 3, wherein the outer case is made of aluminum. [1 2] The electrolytic capacitor according to any one of the foregoing paragraphs 1 to 3, which is an aluminum electrolytic capacitor. [13] The electrolytic capacitor according to any one of the foregoing paragraphs 1 to 3, wherein the capacitor element is formed by winding a separator interposed between an anode foil and a cathode foil. [1 4] An electrolytic capacitor is an electrolytic capacitor for accommodating a capacitor element in an aluminum outer case, characterized in that the outer peripheral surface of the outer case is covered with an insulating film. [15] The electrolytic capacitor according to the item 14, wherein the insulating film is an alumina film. [16] The electrolytic capacitor according to the item 14, wherein the insulating film is an aluminum nitride film. [1 7] An electrolytic capacitor for electrolytic capacitors in which capacitor elements are housed in an aluminum outer case, characterized in that the outer peripheral surface of the outer case is anodized by surface treatment -8- (6) 1240937 [18] — An electrolytic capacitor for electrolytic capacitors in which capacitor elements are housed in an aluminum outer case, which is characterized by the outer peripheral surface of the outer case, It is covered with a nitride film formed by nitriding the surface. [19] The electrolytic capacitor according to any one of the preceding paragraphs 14 to 18, wherein the thickness of the film is 1 to 20 μm. [20] The electrolytic capacitor according to any one of the foregoing paragraphs 14 to 18, wherein a thermal conductivity of 1 W / m · κ is interposed between the exterior case and the capacitor element in a contact state therewith. The above heat conductive material. [21] The electrolytic capacitor according to the item 20 above, wherein the thermally conductive material having a thermal conductivity of 1 W / m · K or more is made of aluminum fine particles, aluminum nitride fine particles, boron nitride fine particles, and zinc oxide fine particles. One or two or more kinds of particles selected from the formed group are diffused in a heat conductive material made of a base material. [22] The electrolytic capacitor according to the item 20, wherein the heat conductive material having a thermal conductivity of 1 W / m · K or more is a heat conductive material made by diffusing aluminum fine particles into a base material. [23] The electrolytic capacitor according to the above item 21 or 22, wherein the average particle diameter of the fine particles is 0.5 to 5 μm. [24] The electrolytic capacitor according to the above item 21 or 22, wherein a content rate of the fine particles in the heat conductive material is 70 mass / °. the above. [2 5] The electrolytic capacitor as described in the foregoing paragraph 2 1 or 22, wherein -9-1240937 is used for the above-mentioned base material, and silicone oil or / and modified silicone oil can be used. [26] The electrolytic capacitor according to the above item 21 or 22, wherein a synthetic resin can be used for the base material. [27] The electrolytic capacitor according to the above item 26, wherein the synthetic resin is a polyolefin. [2 8] The electrolytic capacitor according to the item 27, wherein the polyolefin is polypropylene or polyethylene. [29] The electrolytic capacitor according to any one of the preceding paragraphs 20 to 22, wherein 30% or more of the height of the capacitor element is in contact with the heat conductive material. [30] The electrolytic capacitor according to any one of 14 to 18 above, which is an aluminum electrolytic capacitor. [3 1] The electrolytic capacitor according to any one of the foregoing paragraphs 14 to 18, wherein the above-mentioned capacitor element is formed by winding a separator interposed between an anode electrode and a cathode foil. In the invention of Π], a thermally conductive material having a thermal conductivity of 1 w / m · K or more in a state of contact with the outer case and the capacitor element is interposed therebetween. Therefore, the heat generated in the capacitor element is caused by the The heat conductive material efficiently transfers heat to the outer case and dissipates heat to the outside, so that the capacitor element can be prevented from becoming high temperature, and an electrolytic capacitor having a long life and a long life can be provided. In addition, 'because of its excellent heat dissipation properties, even when a large current or a high ripple current is applied', it is possible to sufficiently suppress the temperature rise of the capacitor element. In addition, the heat dissipation is improved only by interposing the above-mentioned specific heat conductive material between the outer case and the capacitor element. Therefore, there is no need to change the design of the capacitor element itself or the internal structure. -10- (8) 1240937 Can be manufactured cheaply. In the invention of [2], in the heat conductive material, one or two or more kinds of particles selected from the group consisting of aluminum particles, aluminum nitride particles, boron nitride particles, and zinc oxide particles are used to diffuse into the base material. The heat conductive material made in the middle is a heat conductive material that diffuses a specific compound with excellent thermal conductivity into the base material. Therefore, the heat generated in the capacitor element is efficiently transferred to the outer case through the heat conductive material. Furthermore, since the heat is radiated to the outside, the capacitor element can be more effectively prevented from becoming high temperature. In the invention of [3], the heat conductive material is a heat conductive material made by diffusing aluminum particles into a base material. Therefore, the heat generated in the capacitor element is more efficiently transferred to the outside through the heat conductive material. The case is mounted and radiated to the outside, so that the capacitor element can be more effectively prevented from becoming high temperature. In the invention of [4], since the average particle diameter of the fine particles is 0.5 to 5 μm, the heat dissipation property of the electrolytic capacitor can be further improved. In the invention of [5], since the content rate of the fine particles in the heat conductive material is set to 70% by mass or more, the heat dissipation property of the electrolytic capacitor can be further improved at a lower cost. In the invention of [6], because of the use of silicone oil (including modified silicone oil) in the substrate, the heat dissipation of the electrolytic capacitor can be further improved. In the invention of [7], because of the use of synthetic resin in the base material ', the heat dissipation of electrolytic capacitors can be improved at a lower cost. In the invention of [8], the synthetic resin is made of polyolefin, so that the heat dissipation of the electrolytic capacitor can be further improved. -11-(9) 1240937 In the invention of [9], the above-mentioned polyolefin is made of polypropylene and polyethylene, so in addition to low cost, it can be fully taken into consideration because it does not contain a halogen environment. In the invention of [10], since the heat conductive material is in a contact state at least 30% of the height of the capacitor element, sufficient superior heat resistance can be ensured. In the invention of [1 Π, the outer case is made of aluminum, so it is lightweight, and the heat dissipation of the electrolytic capacitor can be further improved. In the invention of [1 2], an aluminum electrolytic capacitor having excellent heat dissipation characteristics can be provided. According to the invention of [13], it is possible to provide an electrolytic capacitor having sufficient capacitance and excellent heat dissipation characteristics. In the invention of [1 4], the outer case is made of an excellent thermal conductivity, and the insulating film is integrally covered on the outer case. Since no air layer is involved in the outer case, the Heat can be efficiently radiated to the outside by the exterior case and the insulating film. From preventing the capacitor element from becoming high temperature, it provides a durable and long life capacitor. Since the heat dissipation is excellent, even when a large current or a high current is applied, the temperature rise of the capacitor element can be sufficiently suppressed. Since an insulating film is formed only on the outer peripheral surface of the outer case, it can be insulated from the outside. In addition, an insulating film is formed only on the outer peripheral surface of the outer casing, which can improve heat dissipation. Therefore, it is not necessary to design the capacitor itself or the internal structure itself. Therefore, it can be manufactured inexpensively in the invention of [15]. The insulating film is formed by the aluminum oxide film and / or the electric ripple between the pair system and the heterogeneous electrical system and has an aluminum structure. And to ensure that the floor unit 〇 Chengzhi (10) 1240937, it can ensure the insulation with the outside. In the invention of [1 6], since the insulating film is formed of an aluminum nitride film, insulation with the outside can be ensured. In the invention of [1 7], the outer case is made of aluminum having excellent thermal conductivity, and the anodized film is integrally covered on the outer case, and there is no air layer interposed therebetween. The heat generated by the capacitor element can be efficiently radiated to the outside through the exterior case and the anodized film. As a result, the capacitor element can be prevented from becoming high temperature, and an electrolytic capacitor having a long life and a long life can be provided. Since the heat dissipation is excellent, even when a large current or a high ripple current is applied, the temperature rise of the capacitor element can be sufficiently suppressed. In addition, since the film for insulation from the outside is formed of an anodized film, insulation with the outside can be ensured. In addition, the anodized film is formed by surface treatment on the outer peripheral surface of the outer case, so that the bonding strength between the outer case and the anodized film can be sufficiently ensured, and the durability of the anodized film without peeling can be provided. Excellent electrolytic capacitor. In addition, since the anodic oxide film is formed by coating only the outer peripheral surface of the outer case, heat dissipation can be improved. Therefore, design changes of the capacitor element itself or the internal structure itself are not required, and thus it can be manufactured at low cost. In the invention of [1 8], the outer casing is made of aluminum having excellent thermal conductivity, and the aluminum nitride film is integrally covered on the outer casing, and there is no air layer interposed therebetween. Therefore, The heat generated in the capacitor element can be efficiently radiated to the outside through the exterior case and the aluminum nitride film. As a result, the capacitor element can be prevented from becoming high temperature, thereby providing an electrolytic capacitor with a long life and a long life. Because of its excellent heat dissipation, even when a large current or high wave -13- (11) 1240937 ripple current is applied, the temperature rise of the capacitor element can be sufficiently suppressed. In addition, the film for insulation from the outside is formed of aluminum nitride, so that the insulation from the outside can be ensured. In addition, since the aluminum nitride is formed by surface nitriding treatment on the outer peripheral surface of the outer case, the bonding strength between the outer case and the aluminum nitride film can be sufficiently ensured, and the aluminum nitride can be provided without peeling. Electrolytic capacitor with excellent durability. In addition, the aluminum nitride film can be formed by coating only the outer peripheral surface of the outer case to improve heat dissipation. Therefore, design changes of the capacitor element itself or the internal structure itself are not required, and thus it can be manufactured at low cost. In the invention of [1 9], sufficient insulation with the outside can be ensured, and excellent heat dissipation can be ensured. In the invention of [2 0], a thermally conductive material having a thermal conductivity of 1 W / m · K or more in contact with these is interposed between the outer case and the capacitor element, so the heat generated in the capacitor element Since the heat is efficiently transferred to the outer case through this heat conductive material, the heat dissipation characteristics of the electrolytic capacitor can be further improved. In the invention of [2 1], as the heat conductive material, one or two or more kinds of particles selected from the group consisting of aluminum particles, aluminum nitride particles, boron nitride particles, and zinc oxide particles are used to diffuse into the substrate. A heat conductive material made of a material is a heat conductive material that diffuses a specific compound having excellent thermal conductivity into a base material. Therefore, the heat generated in the capacitor element is efficiently transferred to the exterior through the heat conductive material. The casing can further improve the heat dissipation characteristics of the electrolytic capacitor. In the invention of [2 2], the heat conductive material is a heat conductive material made by dispersing Ming particles (12) 1240937 into the base material. Therefore, the heat generated in the capacitor element is more efficient through the heat conductive material. Good heat transfer to the outer casing. In the invention of [2 3], the reason why the average particle diameter of the fine particles is 0.5 to 5 μm 'can improve the heat dissipation of the electrolytic capacitor. In the invention of [24], since the content rate of the fine particles in the heat conductive material is set to 70% by mass or more, the heat dissipation property of the electrolytic capacitor can be further improved at a lower cost. In the invention of [25], the use of silicone oil (including modified silicone oil) in the base material can improve the heat dissipation of the electrolytic capacitor. In the invention of [2 6], the substrate is made of synthetic resin, so that the heat dissipation of the electrolytic capacitor can be improved at a lower cost. In the invention of [27], since the synthetic resin is made of polyolefin, the heat dissipation of the electrolytic capacitor can be further improved. In the invention of [28], the polyolefin is made of polypropylene or / and polyethylene, so in addition to low cost, it does not contain halogen, and can also take full consideration of the environment. In the invention of [2 9], more than 30% of the height of the capacitor element is in contact with the above-mentioned heat-conducting material, and therefore, sufficient excellent heat-dissipation properties can be ensured. In the invention of [3 0], an aluminum electrolytic capacitor having excellent heat dissipation characteristics can be provided. According to the invention of [31], an electrolytic capacitor having a sufficient electrostatic capacity and excellent heat dissipation characteristics can be provided. -15- (13) 1240937 [Embodiment] The electrolytic capacitor of the present invention may be any type as long as it has a heat-releasing capacitor, and may be, for example, a capacitor using a valve-acting metal, a ceramic capacitor, a film capacitor, or styrene. Capacitors, etc. Among them, capacitors using a valve-acting metal are preferred, and aluminum electrolytic capacitors, giant capacitors, and niobium-based (including niobium oxide) capacitors are more preferred. The above-mentioned capacitor using a valve-acting metal is an oxide film produced on the metal surface of the capacitor, which only has the characteristic of making the current flow in one direction and very difficult to flow in the opposite direction, that is, an oxide film with a rectifying effect. . Next, a longitudinal sectional view of an electrolytic capacitor (1) according to an embodiment of the first invention is shown in the first figure. The electrolytic capacitor (1) is an aluminum electrolytic capacitor and includes a capacitor element (2), a bottomed cylindrical outer casing (3) that houses the capacitor element (2), and the outer casing (3) an electrically insulating sealing member (6) for sealing the opening on the upper surface, a pair of electrode terminals (7) (7) arranged through the sealing member (6), and a lower end connected to the electrode terminal (7) And the wires (8) of the capacitor element (2). Furthermore, a heat conducting material (5) having a thermal conductivity of 1 W / m · K or more in contact with these is interposed between a gap between the outer casing (3) and the capacitor element (2). In this electrolytic capacitor (1), the heat generated in the capacitor element (2) is efficiently transferred to the exterior case (3) through the heat conductive material (5), and is radiated to the outside, so it can be prevented The capacitor element (2) becomes a high temperature, thereby becoming an electrolytic capacitor with a long life and a long life. Therefore, -16- (14) 1240937 is excellent in heat dissipation. Therefore, even when a large current or a high ripple current is applied, the temperature rise of the capacitor element (2) can be sufficiently suppressed. The capacitor element (2) is formed by winding a separator between an anode foil and a cathode foil. The capacitor element (2) is impregnated with an electrolytic solution. As for the outer casing (3), it is preferable to use metal, and it is more preferable to use aluminum. When aluminum is used, the weight can be reduced, and the heat dissipation efficiency of the electrolytic capacitor (1) can be improved. For the above-mentioned thermally conductive material having a thermal conductivity of 1 W / m · K or more, it is preferable to use one or two or more selected from the group consisting of aluminum particles, aluminum nitride particles, boron nitride particles, and zinc oxide particles. The particles are diffused into the heat conductive material made of the base material. At this time, the heat generated in the capacitor element (2) can be more efficiently transferred to the outer casing (3) through the heat conductive material (5). And dissipates heat to the outside. Therefore, the capacitor element (2) can be more effectively prevented from becoming high temperature. Among them, the heat conductive material (5) is more preferably a heat conductive material made by diffusing aluminum particles into a base material. At this time, the capacitor element (2) can be more effectively prevented from becoming high temperature. The average particle diameter of the fine particles is preferably in a range of 0.5 to 5 μm. If it is less than 0.5 μm, the particles may be easily aggregated in the base material, and therefore it is not preferable. On the other hand, when it exceeds 5 μm, the diffusion stability of the particles in the base material is reduced, and the particles may be easily precipitated in the base material. Therefore, it is difficult to efficiently transfer the heat generated in the capacitor element (2). To the outer casing (3), so this is less used. Among them, the average particle diameter of the fine particles is more preferably in a range of 1 to 4 μm. -17- (15) 1240937 The content ratio of the fine particles in the heat conductive material (5) is preferably set to 70% by mass or more. When it is less than 70% by mass, it may be difficult to obtain excellent heat dissipation performance, and therefore it is not used. The upper limit of the content rate of the fine particles is preferably 90% by mass or less. When the content exceeds 90% by mass, the fluidity is deteriorated and the thermal conductivity may be lowered. Although the base material is not particularly limited, it is preferred to use modified silicone oils such as alkyl-modified silicone oils and epoxy-modified sand oils in addition to silicone oils. Among them, the use of modified silicone oil is even better. In this case, 'the thermal convection in the base material has the effect of promoting heat conduction', so that the heat dissipation of the electrolytic capacitor (2) can be further improved. For the substrate, in addition to the compounds exemplified above, for example, aliphatic resins (such as polyolefins), unsaturated polyester resins, acrylic resins, modified acrylic resins, vinyl esters, and epoxy resins can be used. , Silicone resin and other synthetic resins. The synthetic resin may be a low molecular weight body or a high molecular weight body. The synthetic resin may be any of oily, rubbery, and hardened materials. Among these synthetic resins, polyolefins are preferably used, and more preferred resins are polypropylene and polyethylene. In the first invention, although the heat conducting material (5) is interposed between the outer casing (3) and the capacitor element (2), the filling height of the heat conducting material (5) at this time is a capacitor. It is preferable that the element (2) be constructed by 30% or more of its height. That is, it is preferable that 30% or more of the height of the capacitor element (2) is configured to be in contact with the heat conductive material (5). With this configuration, sufficient and excellent heat dissipation is ensured. Next, a sectional view of an electrolytic capacitor (1) -18- (16) 1240937 according to an embodiment of the second invention is shown in the second figure. The electrolytic capacitor (]) is an aluminum electrolytic capacitor, which includes a capacitor element (2), a bottomed cylindrical aluminum outer casing (3) housing the capacitor element (2), An insulating film (4) formed on the outer peripheral surface of the casing (3), an electrically insulating sealing member (6) that seals an opening on the upper surface of the exterior casing (3), and penetrates the sealing member (6) A pair of electrode terminals (7) (7) and a wire (8) connecting the lower end of the electrode terminal (7) and the capacitor element (2) are arranged. The insulating film (4) is integrally covered so that the air layer does not exist on the outer peripheral surface of the exterior case (3). The capacitor element (2) is formed by winding a separator between an anode foil and a cathode foil. The capacitor element (2) is impregnated with an electrolytic solution. In this electrolytic capacitor (1), 'the outer case (3) is made of aluminum having excellent thermal conductivity, and the insulating film (4) is integrally covered with the outer case (3)' among them There is no air layer in between, and the heat generated in the capacitor element (2) is efficiently radiated to the outside through the outer casing (3) and the insulating film (4), so the capacitor element (2) can be prevented It becomes round temperature. In addition, since an insulating film (4) is formed on the outer peripheral surface of the exterior case (3), insulation with the outside can be ensured. It is also adopted in the present embodiment, and a thermal conductivity of 1 W / m is placed in a gap between the outer casing (3) and the capacitor element (2) in a state of contact with these. Due to the composition of the heat conducting material (5) above K, the heat generated in the capacitor element (2) is efficiently transferred to the outer casing (3) through the heat conducting material (5), so that electricity can be generated. -19- (17) 1240937 The heat dissipation performance of the capacitor (i) is further improved. In this second invention, it is preferable that the thickness of the insulating film (4) is set to 1 to 20 m. When it is less than Ιμηι, the insulating film may be easily peeled off due to contact with other objects, so it is not possible to ensure the insulation with the outside. Therefore, it is less used. There is a concern that the heat dissipation property is reduced, and therefore it is less used. Among them, the thickness of the insulating film (4) is more preferably set to 3 to 10 μm. The insulating film (4) is not particularly limited, but an alumina film or an aluminum nitride film is preferred. When composed of an aluminum oxide film or an aluminum nitride film, there is an advantage that it is reliably insulated from the outside. In addition, as for the above-mentioned insulating film (4), a film formed by applying an insulating coating material may be used. Further, such an insulating coating film may be coated on the above-mentioned alumina film or aluminum nitride film to further integrate the insulating coating film. The alumina film (4) is applied to the outer peripheral surface of the aluminum outer casing (3), and is subjected to a surface treatment (such as anodizing treatment) so that the outer peripheral surface of the outer casing (3) is not exposed. There is a method in which an air layer is formed, and is integrally formed. When formed by this surface treatment, the bonding strength between the outer casing (3) and the alumina film (4) can be fully obtained. In addition, the aluminum nitride film (4) is formed on the outer peripheral surface of the outer casing (3) by surface nitriding treatment (heating treatment in a nitrogen atmosphere, etc.) to make the outer casing (3 ) Is formed by integrally covering in a manner that no air layer exists on the outer peripheral surface. When this surface is nitrided -20- (18) 1240937, the bonding strength between the outer casing (3) and the aluminum nitride film (4) can be sufficiently obtained. In the above-mentioned embodiment, although the insulating film (4) is entirely formed on the outer peripheral surface of the outer casing (3), it is not particularly limited to this structure, and the above-mentioned insulation may also be adopted. The film (4) is formed by covering a part of the outer peripheral surface of the outer casing (3). However, from the viewpoint of improving the heat dissipation property, it is preferable that the insulating film (4) is entirely formed on the outer peripheral surface of the exterior case (3). In this second invention, the same materials as in the first invention can be used for the above-mentioned heat conductive material having a thermal conductivity of 1 w / m · K or more. That is, as the thermally conductive material having a thermal conductivity of 1 W / m · K or more, one or two or more selected from the group consisting of microparticles, aluminum nitride particles, boron nitride particles, and zinc oxide particles may be used. It is preferable that the particles are made of a heat conductive material that is diffused in the base material. At this time, the heat generated in the capacitor element (2) can be transferred to the outer casing (3) more efficiently through the heat conductive material (5). ) And dissipate heat to the outside. Accordingly, the capacitor element (2) can be more effectively prevented from becoming high temperature. Among them, the heat conductive material (5) is more preferably a heat conductive material made by diffusing aluminum particles into a base material. At this time, the capacitor element (2) can be more effectively prevented from becoming high temperature. The average particle diameter of the fine particles is preferably in a range of 0.5 to 5 μm. The fine particles in this range are preferable for the same reasons as those listed in the first invention. Among them, the average particle diameter of the fine particles is more preferably in a range of ˜4 μm. In addition, the content ratio of the fine particles in the heat conductive material (5) is set to 70% by mass or more as compared with -21-(19) 1240937. When it is less than 70% by mass, it is difficult to obtain excellent heat dissipation performance, and therefore it is not used. The upper limit of the content of the fine particles is preferably 90% by mass or less, and more than 90% by mass. In this case, 'they deteriorate fluidity, and there is a fear that the thermal conductivity may be lowered', so they are not used. Although the base material is not particularly limited, it is preferable to use modified silicone oils such as alkyl modified silicone oil and epoxy modified silicone oil in addition to silicone oil. Among them, the use of modified silicone oil is even better. In this case, the heat convection in the base material has the effect of promoting heat conduction, so that the heat dissipation of the electrolytic capacitor (2) can be further improved. For the substrate, in addition to the compounds exemplified above, for example, aliphatic resins (such as polyolefins), unsaturated polyester resins, acrylic resins, modified acrylic resins, vinyl esters, and epoxy resins can be used. , Silicone resin and other synthetic resins. The synthetic resin may be a low molecular weight body or a high molecular weight body. The synthetic resin may be any of oily, rubbery, and hardened materials. Among these synthetic resins, polyolefins are preferably used, and more preferred resins are polypropylene and polyethylene. In the second invention, 'Although the heat conductive material (5) is interposed between the outer casing (3) and the capacitor element (2), at this time, the filling height of the heat conductive material (5) is a capacitor. It is preferable that the element (2) be constructed by 30% or more of its height. In other words, more than 30% of the height of the capacitor element (2) is more than izb and is configured to be in contact with the heat conductive material (5). With this configuration, sufficient and excellent heat dissipation is ensured. The electrolytic capacitor of the present invention is not particularly limited to the aforementioned embodiment -22- (20) 1240937 ', and various design changes can be made. For example, in the above-mentioned embodiment, although a pair of electrode terminals (7) (7) are provided on the upper portion of the electrolytic capacitor, 'one electrode terminal may be provided on the _L portion of the electrolytic capacitor, and The electrode terminal is a structure provided at the lower part of the electrolytic capacitor. Next, specific embodiments of the present invention will be described. < Example 1 > An electrolytic capacitor having a structure shown in Fig. 1 was produced. At the time of manufacture, a chlorinated vinyl resin was used as the outer casing (3). In addition, the heat conductive material (5) is a heat conductive material formed by using 80 parts by mass of aluminum particles (average particle diameter 2.5 μm) and spreading to 20 parts by mass of epoxy denatured silicone oil. ) To 80% of the height of the capacitor element (2). < Example 2 > An electrolytic capacitor similar to that of Example 1 was produced with the exception of the above-mentioned aluminum particles, except that aluminum particles having an average particle diameter of 3.0 μm were used. < Example 3 > An electrolytic capacitor similar to that of Example 1 was produced with the exception of the above-mentioned aluminum particles, except that aluminum particles having an average particle diameter of 1.0 µm were used. < Example 4>-23- (21) 1240937 The aluminum electrolytic particles described above were manufactured in the same manner as in Example 1 except that the particles having an average particle diameter of 4.0 μΐΏ were used. < Example 5 > An electrolytic capacitor similar to that of Example 1 was produced using the above-mentioned heat conductive material except that the content of aluminum particles was set to 70% by mass. < Example 6 > An electrolytic capacitor similar to that of Example 1 was produced using the above-mentioned heat conductive material, except that the aluminum particulate content rate was set to 85 mass%. < Example 7 > An electrolytic capacitor similar to that of Example 1 was produced using the above-mentioned heat conductive material except that the content of aluminum particles was set to 90% by mass. < Example 8 > As for the above-mentioned fine particles, the same electrolytic capacitor as in Example〗 was produced except that aluminum nitride particles having an average particle diameter of 1.5 μm were used instead of aluminum particles having an average particle diameter of 2.5 μm . < Example 9 > In the above-mentioned fine particles, aluminum nitride fine particles having an average particle diameter of 2.0 µm were used instead of Ming fine particles having an average particle diameter of 2.5 µm, and the same electrolytic capacitor was prepared as in Example 1. -24 · (22) 1240937 < Example 1 > The above-mentioned fine particles were manufactured by using zinc oxide particles having an average particle diameter of 2.0 µm instead of aluminum particles having an average particle diameter of 2.5 µm, to prepare the same electrolytic capacitor as in Example 1. < Example 1 1 > An electrolytic capacitor similar to that of Example 1 was produced except that silicone oil was used instead of the above-mentioned modified silicone oil. < Example 1 2 > An electrolytic capacitor similar to that of Example 1 was produced except that polypropylene was used instead of the above-mentioned modified silicone oil. < Example 1 3 > An electrolytic capacitor similar to that of Example 5 was produced except that polypropylene was used instead of the above-mentioned modified silicone oil. < Example 1 4 > An electrolytic capacitor similar to that of Example 7 was produced except that polypropylene was used instead of the above-mentioned modified silicone oil. < Example 5 > An electrolytic capacitor similar to that of Examples -25 to 124093: 8 was produced except that polypropylene was used instead of the modified sand oil. < Example 1 6 > An electrolytic capacitor similar to that of Example 9 was obtained except that polypropylene was used instead of the modified silicone oil. < Example 17 > An electrolytic capacitor similar to that of Example 10 was produced except that polypropylene was used in place of the above-mentioned modified silicone oil. < Example ' 1 8 > An electrolytic capacitor similar to that of Example 1 was produced except that polyethylene was used instead of the above-mentioned modified silicone oil. < Comparative Example 1 > An electrolytic capacitor similar to that of Example 1 was produced except that the above-mentioned heat conductive material was a modified silicone oil (those containing no aluminum particles). < Comparative Example 2 > An electrolytic capacitor similar to that of Example 1 was produced except that the above-mentioned heat conductive material was made of polypropylene (who did not contain the @@ #). The electrolytic capacitors obtained as described above were evaluated by the following evaluation methods. The results are shown in Tables 1 to 3. -26-(24) 1240937 < Evaluation method of heat dissipation characteristics > In an environment where the ambient temperature is 35 ° C, an electrolytic capacitor is arranged, and a ripple current of 5 A is applied to the capacitor element to generate heat, and the temperature of the capacitor element at this time (the maximum rise) is measured. temperature). The temperature of the capacitor element is measured using a thermocouple.

-27- 1240937-27- 1240937

I嗽 i實施例7 1 1 1 1 1 1 ο 1 Γν) 68.3 實施例6 οο 1 1 1 1 1 1 1 <Ν CN 68.5 實施例5 ο 1 1 1 1 1 1 1 69.1 實施例4 1 1 1 § 1 1 1 ： 1 t i 68.9 實施例3 1 1 § 1 1 1 1 1 Ο (Ν 68.6 實施例2 1 g 1 1 1 1 1 1 00 68.8 實施例1 1 1 1 1 1 1 1 Ο (Ν 68.6 鋁微粒(平均粒徑2·5μπι) 鋁微粒(平均粒徑Ι.ομηι) 鋁微粒(平均粒徑3·0μηι) 鋁微粒(平均粒徑4·0μηι) 氮化鋁微粒(平均粒徑1 ·5μ m) 氮化硼微粒(平均粒徑2.0μ m ) 氧化鋅微粒(平均粒徑2.0μ m) 變性矽油矽油熱傳導材之熱傳導率(W/m· Κ) 電容器元件之發熱溫度(最大上昇溫度)(°C ) 酹 _ ^Ω. 切Π 敏 i? -28- 1240937Example 7 1 1 1 1 1 1 ο 1 Γν) 68.3 Example 6 οο 1 1 1 1 1 1 1 < N CN 68.5 Example 5 ο 1 1 1 1 1 1 1 69.1 Example 4 1 1 1 § 1 1 1: 1 ti 68.9 Example 3 1 1 § 1 1 1 1 1 0 (N 68.6 Example 2 1 g 1 1 1 1 1 1 00 68.8 Example 1 1 1 1 1 1 1 1 0 (N 68.6 Aluminum particles (average particle size 2.5 μm) Aluminum particles (average particle diameter 1.0 μm) Aluminum particles (average particle diameter 3.0 μm) Aluminum particles (average particle diameter 4.0 μm) Aluminum nitride particles (average particle diameter 1 5 μm) Boron nitride particles (average particle size 2.0 μm) Zinc oxide particles (average particle size 2.0 μm) Thermal conductivity (W / m · K) of denatured silicone oil and silicone oil thermal conductive material Temperature) (° C) 酹 _ ^ Ω. 切 Π 敏 i? -28- 1240937

比較例1 1 1 1 1 1 1 1 〇 τ—Η 1 ΓΠ 73.2 實施例11 § 1 1 1 歷 1 1 1 〇 (Ν 68.6 丨實施例10 1 1 1 1 1 1 g 1 〇 70.0 實施例9 1 1 1 1 1 § 1 1 (Ν (Ν 68.5 丨實施例8 1 1 1 1 § 1 1 1 〇 rn 68.1 鋁微粒(平均粒徑2·5μη〇鋁微粒(平均粒徑1·〇μηι) 鋁微粒(平均粒徑3·0μηι) 鋁微粒(平均粒徑4·0μπι) 氮化銘微粒(平均粒徑1 ·5μ m ) 氮化硼微粒(平均粒徑2·0μ m ) 氧化鋅微粒(平均粒徑2.0μ m ) 變性矽油矽油熱傳導材之熱傳導率(W/m· K) 電容器元件之發熱溫度(最大上昇溫度)(°C ) nmL DlS| a _ 如壤撤 -29- 1240937Comparative Example 1 1 1 1 1 1 1 1 〇τ—Η 1 ΓΠ 73.2 Example 11 § 1 1 1 Calendar 1 1 1 〇 (N 68.6 丨 Example 10 1 1 1 1 1 1 g 1 〇70.0 Example 9 1 1 1 1 1 § 1 1 (N (N 68.5 丨 Example 8 1 1 1 1 § 1 1 1 〇rn 68.1 aluminum particles (average particle size 2.5 μηι aluminum particles (average particle diameter 1.0 μm) aluminum particles (Average particle size 3.0 μm) Aluminum particles (average particle size 4.0 μm) Nitrided particles (average particle size 1.5 μm) Boron nitride particles (average particle size 2.0 μm) Zinc oxide particles (average particle size) Diameter 2.0 μ m) Thermal conductivity (W / m · K) of denatured silicone oil and silicone oil thermal conductive material Heating temperature (maximum rising temperature) of capacitor element (° C) nmL DlS | a _ Ruyangxiu-29- 1240937

£ 比較例2 1 〇 1 0.15 74.5 實施例18 § » 1 1 1 1 1 1 G) 68.7 j 實施例17 1 1 1 1 1 1 § 1 〇 70.3 1 實施例16 1 1 1 1 1 § 1 1 68.6 實施例15 1 1 1 1 § 1 1 1 69.0 實施例14 1 1 1 1 1 1 〇 1 寸 (N 68.4 實施例13 〇 1 1 1 1 1 1 1 69.2 j 實施例12 1 1 1 1 1 1 1 Ο) 68.7 鋁微粒(平均粒徑2·5μηι) 鋁微粒(平均粒徑Ι.Ομηι) 鋁微粒(平均粒徑3·0μηι) 1鋁微粒(平均粒徑4.0μηι) 氮化鋁微粒(平均粒徑1 ·5μ m) 氮化硼微粒(平均粒徑2·0μ m) 氧化鋅微粒(平均粒徑2.0μ m) 變性矽油矽油熱傳導材之熱傳導率(W/m · K) 電容器元件之發熱溫度(最大上昇溫度)(°C ) 酹 ¢1 擊: 3? 链 -30- (28) 1240937 由表1〜3可了解，本發明之實施例1〜1 8之電解電容器，其散熱性優異，且可有效地抑制由電容器元件之發熱導致的溫度上昇。相對於此，比較例1，2之電解電容器的散熱性不充分，因此由電容器元件之發熱導致的溫度上昇很大。 <實施例1 9 > 製作第2圖所示之構成的電解電容器。在製作時，使 $ 用矽油（未含有鋁微粒者）做爲熱傳導材（5 )，並且，使用鋁製者做爲外裝殻體（3 )，在該外裝殼體（3 )上，以硫酸濃度1 5 %、液溫度2 0 °C、電流密度1 · 5 A / d m2之條件下，進行表面處理（例如陽極氧化處理等）時，在外裝殼體（3 )之外周面上被覆地形成5 μπι之氧化鋁皮膜 (4)。並且，將電容器元件之高度的80%與熱傳導材接觸的方式而充塡熱傳導材。 <實施例20> 被覆形成的氧化鋁皮膜的厚度被設定爲1 〇 μιη以外，製成與實施例〗9同樣的電解電容器。 <實施例2 1 > 被覆形成的氧化鋁皮膜的厚度被設定馬1 5 μιη以外，製成與實施例1 9同樣的電解電容器。 -31 - (29) 1240937 <實施例2 2 > 製作第2圖所示之構成的電解電容器。在製作時，使用矽油（未含有鋁微粒者）做爲熱傳導材（5 )，並且，使用鋁製者做爲外裝殼體（3 )，在該外裝殻體（3 )上，以氮化溫度45 Ot、保持時間8小時之條件下，進行表面氮化處理（（在氮氣環境下之加熱處理）時，在外裝殼體 (3 )之外周面上被覆地形成3 μιη之氮化鋁皮膜（4 )。並且，將電容器元件之高度的80%與熱傳導材接觸的方式而充塡熱傳導材。 <實施例2 3 > 被覆形成的氮化鋁皮膜的厚度被設定爲8 μm以外，製成與實施例1 9同樣的電解電容器。 <實施例2 4 > 被覆形成的氮化鋁皮膜的厚度被設定爲1 3 以外’ 製成與實施例1 9同樣的電解電容器。〈實施例2 5 > 以接觸狀態介裝於外裝殻體與電容器元件之間的熱傳導材方面，使用平均粒徑爲2 · 5 μ m之鋁微粒擴散於環氧變性矽油中形成的熱傳導材以外，製成與實施例1 9同樣的電解電容器。上述熱傳導材中’銘微粒含有率爲80質量 %。並且，將電容器元件之高度的80%與熱傳導材接觸的 -32- (30) 1240937 方式而充塡熱傳導材。 <實施例26> 上述熱傳導材方面，使用平均粒徑爲1 . 5 μΐΏ之氮化鋁微粒擴散於環氧變性矽油中形成的熱傳導材（氮化銘微粒含有率爲8 0質量％ )以外，製成與實施例2 5同樣的電解電容器。 <實施例2 7 > 上述熱傳導材方面，使用平均粒徑爲之氮化鋁微粒擴散於環氧變性砂油中形成的熱傳導材（氮化銘微粒含有率爲8 〇質量。/〇)以外，製成與實施例2 5同樣的電解電容器。〈實施例2 8 > 上述熱傳導材方面，使用平均粒徑爲2.0 μιη之氧化鋅微粒擴散於環氧變性矽油中形成的熱傳導材（氧化鋅含有率爲9 0質量％ )以外，製成與實施例2 5同樣的電解電容器。 <實施例29 > 使用矽油以取代上述變性矽油以外，製成與實施例 2 5同樣的電解電容器。 -33 - (31) 1240937 <實施例3 0 > 以接觸狀態介裝於外裝殼體與電容器元件之間的熱傳導材方面，使用平均粒徑爲2.5 μηι之鋁微粒擴散於環氧變性矽油中形成的熱傳導材以外，製成與實施例22同樣的電解電容器。上述熱傳導材中，鋁微粒含有率爲80質量 %。並且，將電容器元件之高度的8 0 %與熱傳導材接觸的方式而充塡熱傳導材。 <實施例3 1 > 上述熱傳導材方面，使用平均粒徑爲1 · 5 μιη之氮化鋁微粒擴散於環氧變性矽油中形成的熱傳導材（氮化鋁微粒含有率爲8 0質量％ )以外，製成與實施例3 0同樣的電解電容器。〈實施例3 2 > 上述熱傳導材方面，使用平均粒徑爲2 · 〇 μπι之氮化鋁微粒擴散於環氧變性矽油中形成的熱傳導材（氮化錦微粒含有率爲8 0質量％ )以外，製成與實施例3 0同樣的電解電容器。 <實施例3 3 > 上述熱傳導材方面，使用平均粒徑爲2 · 〇 μ111之氧化辞微粒擴散於環氧變性矽油中形成的熱傳導材（氧化辞含有率爲9 0質量％ )以外，製成與實施例3 0同樣的電解電容 -34- (32) 1240937 器。 <實施例3 4〉使用矽油以取代上述變性矽油以外’製成與實施例 3 0同樣的電解電容器。〈實施例3 5 > 熱傳導材方面，使用平均粒徑爲2 · 5 μ m之銘微粒擴散鲁於聚丙烯中形成的熱傳導材（鋁微粒含有率爲80質量 % )以外，製成與實施例2 5同樣的電解電容器。 <實施例3 6 > 熱傳導材方面，使用平均粒徑爲2 · 5 μ m之鋁微粒擴散於聚丙烯中形成的熱傳導材（鋁微粒含有率爲70質量 % )以外，製成與實施例2 5同樣的電解電容器。 <實施例3 7 > 熱傳導材方面，使用平均粒徑爲2 · 5 μηι之鋁微粒擴散於聚丙烯中形成的熱傳導材（鋁微粒含有率爲90質量 % )以外，製成與實施例2 5同樣的電解電容器。 <實施例3 8 > 上述熱傳導材方面，使用平均粒徑爲1 . 5 μ m之氮化銘微粒擴散於聚丙烯中形成的熱傳導材（氮化鋁微粒含有率 -35- (33) 1240937 爲8 0質量％ )以外，製成與實施例2 5同樣的電解電容器。 <實施例3 9 > 上述熱傳導材方面，使用平均粒徑爲2· 〇μπι t M ft f呂微粒擴散於聚丙烯中形成的熱傳導材（氮化錫微粒含有率爲80質量％ )以外，製成與實施例25同樣的電解電容器。 <實施例40 > 上述熱傳導材方面，使用平均粒徑爲2.以111之氧化金辛微粒擴散於聚丙烯中形成的熱傳導材（氧化胃$有* $胃 8 〇質量。/〇)以外，製成與實施例2 5同樣的電解電容器。 <實施例4 1 > 熱傳導材方面，使用平均粒徑爲2 · 5 μηι之ig微粒ί廣散於聚乙烯中形成的熱傳導材（鋁微粒含有率爲8 0質量 % )以外，製成與實施例2 5同樣的電解電容器。 <實施例4 2 > 熱傳導材方面，使用平均粒徑爲2.5 μπι之鋁微粒擴散於聚丙烯中形成的熱傳導材（鋁微粒含有率爲80質量 % )以外，製成與實施例3 0同樣的電解電容器。 -36- (34) 1240937 〈實施例4 3 > 熱傳導材方面，使用平均粒徑爲2 · 5 μπι之鋁微粒擴散於聚丙烯中形成的熱傳導材（鋁微粒含有率爲7 0質量 % )以外，製成與實施例3 0同樣的電解電容器。 <實施例4 4〉£ Comparative Example 2 1 〇1 0.15 74.5 Example 18 § »1 1 1 1 1 1 G) 68.7 j Example 17 1 1 1 1 1 1 § 1 〇70.3 1 Example 16 1 1 1 1 1 § 1 1 68.6 Example 15 1 1 1 1 § 1 1 1 69.0 Example 14 1 1 1 1 1 1 〇1 inch (N 68.4 Example 13 〇1 1 1 1 1 1 1 69.2 j Example 12 1 1 1 1 1 1 1 〇) 68.7 Aluminum particles (average particle diameter 2.5 μm) Aluminum particles (average particle diameter 1.0 μm) Aluminum particles (average particle diameter 3.0 μm) 1 Aluminum particles (average particle diameter 4.0 μm) Aluminum nitride particles (average particle Diameter 1.5 μm) Boron nitride particles (average particle diameter 2.0 μm) Zinc oxide particles (average particle diameter 2.0 μm) Thermal conductivity of denatured silicone oil silicone oil thermal conductive material (W / m · K) Heating temperature of capacitor element (Maximum rising temperature) (° C) 酹 ¢ 1 stroke: 3? Chain-30- (28) 1240937 It can be understood from Tables 1 to 3 that the electrolytic capacitors of Examples 1 to 18 of the present invention have excellent heat dissipation properties. And can effectively suppress the temperature rise caused by the heating of the capacitor element. On the other hand, the electrolytic capacitors of Comparative Examples 1 and 2 did not sufficiently dissipate heat, so that the temperature rise caused by the heat generation of the capacitor element was large. < Example 1 9 > An electrolytic capacitor having a structure shown in Fig. 2 was produced. At the time of production, silicon oil (those without aluminum particles) is used as the heat conductive material (5), and aluminum is used as the outer casing (3), and on the outer casing (3), When the surface treatment (such as anodizing treatment, etc.) is performed under the conditions of a sulfuric acid concentration of 15%, a liquid temperature of 20 ° C, and a current density of 1.5 A / dm2, the outer surface of the outer casing (3) A 5 μm alumina film (4) was formed on the coating. In addition, the heat conductive material is filled with 80% of the height of the capacitor element in contact with the heat conductive material. < Example 20 > The thickness of the alumina film formed by the coating was set to other than 10 μm, and an electrolytic capacitor similar to that of Example 9 was produced. < Example 2 1 > The thickness of the alumina film formed by the coating was set to a value other than 15 μm, and an electrolytic capacitor similar to that of Example 19 was produced. -31-(29) 1240937 < Example 2 2 > An electrolytic capacitor having a structure shown in Fig. 2 was produced. At the time of manufacture, silicon oil (those without aluminum particles) was used as the heat conductive material (5), and aluminum was used as the outer casing (3), and nitrogen was applied to the outer casing (3). Under the conditions of a temperature of 45 Ot and a holding time of 8 hours, when performing a surface nitriding treatment ((heat treatment in a nitrogen atmosphere)), a 3 μm aluminum nitride is formed on the outer peripheral surface of the outer casing (3). Film (4). Furthermore, the heat conductive material was filled by contacting 80% of the height of the capacitor element with the heat conductive material. &Lt; Example 2 3 > The thickness of the aluminum nitride film formed by the coating was set to be other than 8 μm The same electrolytic capacitor as in Example 19 was made. &Lt; Example 2 4 > The thickness of the aluminum nitride film formed by the coating was set to other than 1 3 '. The same electrolytic capacitor as in Example 19 was produced. Example 2 5 > A thermally conductive material formed by diffusing aluminum particles having an average particle diameter of 2.5 μm in an epoxy-modified silicone oil was used as a thermally conductive material interposed between the outer case and the capacitor element in a contact state. Other than that, the same electrolysis as in Example 19 was made. Capacitors. The content of the particles in the thermally conductive material is 80% by mass. In addition, the thermally conductive material is filled with -32- (30) 1240937 method in which 80% of the height of the capacitor element is in contact with the thermally conductive material. &Lt; Example 26 & gt For the above-mentioned heat conductive material, the heat conductive material having an average particle diameter of 1.5 μΐΏ was diffused in epoxy denatured silicone oil, and the heat conductive material (the content of the nitride fine particles was 80% by mass) was used to make and implement Example 2 5 The same electrolytic capacitor. &Lt; Example 2 7 > As for the above-mentioned heat conductive material, a heat conductive material formed by diffusing aluminum nitride particles having an average particle diameter in epoxy-modified sand oil (the content ratio of nitride particles) Except that it is 80 mass. / 〇), the same electrolytic capacitor as in Example 25 was prepared. <Example 2 8> In the above heat conductive material, zinc oxide fine particles having an average particle diameter of 2.0 μm were diffused in epoxy denaturation. Except for the heat-conducting material (zinc oxide content of 90% by mass) formed in the silicone oil, the same electrolytic capacitor as in Example 25 was made. &Lt; Example 29 > Instead of the above-mentioned modified silicone oil, silicone oil was used. The same electrolytic capacitor as in Example 25 was made. -33-(31) 1240937 < Example 3 0 > In the contact state, the heat conductive material interposed between the outer case and the capacitor element was averaged. Aluminium particles having a particle diameter of 2.5 μm were diffused into a heat conductive material formed by epoxy-denatured silicone oil, and an electrolytic capacitor similar to that of Example 22 was prepared. The heat conductive material had an aluminum particle content of 80% by mass. 80% of the height of the element is filled with the heat conductive material in such a way that it contacts the heat conductive material. < Example 3 1 > In the above-mentioned heat conductive material, a heat conductive material formed by diffusing aluminum nitride particles having an average particle diameter of 1.5 μm in epoxy-denatured silicone oil (the content of aluminum nitride particles is 80% by mass) Except for), the same electrolytic capacitor as in Example 30 was produced. <Example 3 2 > For the above-mentioned thermally conductive material, a thermally conductive material formed by diffusing aluminum nitride particles having an average particle diameter of 2.0 μm in epoxy-denatured silicone oil (the content of nitrided nitride particles was 80% by mass) Other than that, the same electrolytic capacitor as in Example 30 was produced. < Example 3 3 > As for the above-mentioned heat-conducting material, a heat-conducting material (oxidation content rate of 90% by mass) formed by diffusing oxidized particles having an average particle diameter of 2.0 μl in epoxy-modified silicone oil was used. An electrolytic capacitor-34- (32) 1240937 device similar to that in Example 30 was fabricated. < Example 3 4> An electrolytic capacitor similar to that in Example 30 was produced using a silicone oil instead of the above-mentioned modified silicone oil. <Example 3 5 > As for the heat conductive material, the heat conductive material (the aluminum particle content rate was 80% by mass) formed using polypropylene particles having an average particle diameter of 2.5 μm and diffused in polypropylene was manufactured and implemented. Example 2 5 The same electrolytic capacitor. < Example 3 6 > For the heat conductive material, a heat conductive material (aluminum fine particle content rate of 70% by mass) formed by diffusing aluminum fine particles having an average particle diameter of 2.5 μm in polypropylene was used and implemented. Example 2 5 The same electrolytic capacitor. < Example 3 7 > As for the heat conductive material, a heat conductive material having an average particle diameter of 2.5 μm of aluminum particles dispersed in polypropylene (a content of aluminum fine particles of 90% by mass) was used in addition to Examples. 2 5 Same electrolytic capacitors. < Example 3 8 > As for the above-mentioned heat-conducting material, a heat-conducting material in which nitride particles having an average particle diameter of 1.5 μm was dispersed in polypropylene was used (content ratio of aluminum nitride particles -35- (33) Except for 1240937, which is 80% by mass), the same electrolytic capacitor as in Example 25 was prepared. < Example 3 9 > As for the above-mentioned heat-conducting material, a heat-conducting material having an average particle diameter of 2.0 μm t M ft f and dispersed in polypropylene was used (the content of tin nitride particles was 80% by mass). An electrolytic capacitor similar to that of Example 25 was produced. < Example 40 > As for the above-mentioned heat conductive material, a heat conductive material having an average particle diameter of 2. 111 oxidized gold particles was diffused in polypropylene (oxidized stomach $ 有 * $ stomach 8 〇quality. / 〇) Other than that, the same electrolytic capacitor as in Examples 25 was prepared. < Example 4 1 > In the case of a heat conductive material, ig particles having an average particle diameter of 2.5 μm were used, and the heat conductive material (the content of aluminum fine particles was 80% by mass) was widely dispersed in polyethylene. The same electrolytic capacitor as in Examples 25 was used. < Example 4 2 > As for the heat conductive material, a heat conductive material having an average particle diameter of 2.5 μm and diffused in polypropylene (alumina particle content rate of 80% by mass) was used to prepare the same as Example 30. The same electrolytic capacitor. -36- (34) 1240937 <Example 4 3 > As for the heat conductive material, a heat conductive material in which aluminum particles having an average particle diameter of 2.5 μm was diffused in polypropylene (the content of aluminum particles was 70% by mass) was used. Other than that, the same electrolytic capacitor as in Example 30 was produced. < Example 4 4>

熱傳導材方面，使用平均粒徑爲2 · 5 μηι之鋁微粒擴散於聚丙烯中形成的熱傳導材（鋁微粒含有率爲90質量 % )以外，製成與實施例3 0同樣的電解電容器。〈實施例4 5 > 上述熱傳導材方面，使用平均粒徑爲1 . 5 μηι之氮化鋁微粒擴散於聚丙烯中形成的熱傳導材（氮化鋁微粒含有率爲8 0質量％ )以外，製成與實施例3 0同樣的電解電容器。 <實施例4 6 > 上述熱傳導材方面，使用平均粒徑爲2.0 μ m之氮化鋁微粒擴散於聚丙烯中形成的熱傳導材（氮化鋁微粒含有率爲8 0質量％ )以外，製成與實施例3 0同樣的電解電容器。 <實施例4 7 > 上述熱傳導材方面，使用平均粒徑爲2.0 μιη之氧化鋅 -37- (35) 1240937 微粒擴散於聚丙儲中形成的熱傳導材（氧化鋅含有率爲 8 0質量°/。）以外，製成與實施例J 〇问彳永的鼠鮮電谷益。〈實施例4 8 > 熱傳導材方面，使用平均粒惶爲2.5 μ m之銘微粒擴散於聚乙烯中形成的熱傳導材（鋁微粒含有率爲8 0質量 % )以外，製成與實施例3 〇同樣的電解電容器。 <比較例3 > 製作第3圖所示之構成的電解電容器。在製作時，使用矽油做爲熱傳導材（5 )，並且使用鋁製考做爲外裝殼體（1 00 )，在外裝殻體（1 〇〇 )的外側裝設氯化乙嫌樹脂製之封套（1 0 1 )。以下列評價法對上述所獲得的電解電容器進行散熱特性之評價。其結果顯示於表4〜8。 -38- 1240937 比較例3 \ rn 73.2 i實施例24 氮化鋁皮膜 m rn 68.8 實施例23 氮化鋁皮膜〇〇 Ο 68.7 實施例22 氮化鋁皮膜 m 68.7 實施例21 氧化鋁皮膜 CD cn 68.9 實施例20 氧化鋁皮膜 Ο cn 68.7 實施例19 氧化鋁皮膜 cn 68.7 丨種類厚度(μηι) 熱傳導材之熱傳導率 (W/m · K) 制 II ^ 癒cP 裟'1 tj ΐΦ ^ Ι^ιττΠ H 险 tpi w 絶緣皮膜 1240937As for the heat conductive material, an electrolytic capacitor similar to that in Example 30 was fabricated using a heat conductive material (aluminum particle content rate of 90% by mass) formed by diffusing aluminum particles having an average particle diameter of 2.5 μm in polypropylene. <Example 4 5> In the above heat conductive material, a heat conductive material (aluminum nitride fine particle content rate of 80% by mass) formed by diffusing aluminum nitride fine particles having an average particle diameter of 1.5 μm in polypropylene was used. An electrolytic capacitor similar to that in Example 30 was produced. < Example 4 6 > As for the above-mentioned heat conductive material, a heat conductive material (aluminum nitride fine particle content rate of 80% by mass) formed by diffusing aluminum nitride fine particles having an average particle diameter of 2.0 μm in polypropylene was used. An electrolytic capacitor similar to that in Example 30 was produced. < Example 4 7 > As for the above-mentioned heat-conducting material, zinc oxide-37- (35) 1240937 having an average particle diameter of 2.0 μηη was used as a heat-conducting material formed by diffusing fine particles in a polypropylene reservoir (the content of zinc oxide was 80 mass ° (.)), And it was made with Example J 〇 Asking for a long-lasting fresh rice Guyi. <Example 4 8 > As for the heat conductive material, a heat conductive material having an average particle size of 2.5 μm and a particle having an average particle diameter of 2.5 μm diffused in polyethylene (aluminum particle content rate 80% by mass) was used to prepare the same as Example 3. 〇 Same electrolytic capacitor. < Comparative Example 3 > An electrolytic capacitor having a structure shown in Fig. 3 was produced. At the time of production, silicon oil was used as the heat conductive material (5), and aluminum was used as the outer casing (100). The outer side of the outer casing (1000) was made of ethyl chloride resin. Cover (1 0 1). The heat dissipation characteristics of the electrolytic capacitor obtained above were evaluated by the following evaluation methods. The results are shown in Tables 4 to 8. -38- 1240937 Comparative example 3 \ rn 73.2 i Example 24 Aluminum nitride film m rn 68.8 Example 23 Aluminum nitride film 〇006 68.7 Example 22 Aluminum nitride film m 68.7 Example 21 Alumina film CD cn 68.9 Example 20 Alumina film cn 68.7 Example 19 Alumina film cn 68.7 丨 Type thickness (μηι) Thermal conductivity of thermally conductive material (W / m · K) II ^ More cP 裟 '1 tj ΐΦ ^ Ι ^ ιττΠ H Danger tpi w insulation film 1240937

實施例29 氧化鋁皮膜 1 1 1 1 〇 (Ν 63.5 實施例28 氧化鋁皮膜 in 1 ； 1 1 ο 1 〇 64.9 實施例27 氧化鋁皮膜 1 1 g 1 1 (Ν (Ν I 63.4 實施例26 氧化鋁皮膜 1 § 1 1 1 〇 cn 63.0 實施例25 氧化鋁皮膜 g 1 1 1 1 〇 Η 63.5 種類厚度(μ m ) 鋁微粒(平均粒徑2.5μιη) 氮化鋁微粒(平均粒徑1 ·5μ m ) 氮化硼微粒(平均粒徑2·0μ m ) 氧化鋅微粒(平均粒徑2·0μ m ) 變性砂油矽油熱傳導材之熱傳導率(W/m· Κ) 電容器元件之發熱溫度(最大上昇溫度)(°C ) 絶緣皮膜熱傳導材之組成 (質量部） -40 1240937Example 29 Alumina film 1 1 1 1 0 (N 63.5 Example 28 Alumina film in 1; 1 1 ο 1 〇 64.9 Example 27 Alumina film 1 1 g 1 1 (N (N I 63.4 Example 26 Oxidation Aluminum film 1 § 1 1 1 〇cn 63.0 Example 25 Alumina film g 1 1 1 1 〇 63.5 Type thickness (μ m) Aluminum particles (average particle diameter 2.5 μιη) Aluminum nitride particles (average particle diameter 1.5 μ m) Particles of boron nitride (average particle diameter 2.0 μm) Particles of zinc oxide (average particle diameter 2.0 μm) Thermal conductivity of denatured sand oil silicone oil thermal conductive material (W / m · K) Heating temperature of capacitor element (max. Rising temperature) (° C) Composition (mass part) of thermal insulation material for insulation film -40 1240937

9概丨實施例34 氮化鋁皮膜 g 1 1 1 1 〇 (Ν 63.5 實施例33 氮化鋁皮膜 m 1 1 1 ο 1 〇 63.9 實施例32 氮化鋁皮膜 m 1 1 § 1 1 (Ν (Ν 63.4 實施例32 氮化鋁皮膜 m 1 § 1 1 1 〇 cn 63.0 實施例30 |氮化鋁皮膜 cn § 1 1 1 1 〇 (N 63.5 種類厚度(μ m) 鋁微粒(平均粒徑2·5μηι) 氮化鋁微粒(平均粒徑1.5μηι) 氮化硼微粒(平均粒徑2·0μ m) 氧化鋅微粒(平均粒徑2.0μ m ) 變性矽油矽油熱傳導材之熱傳導率(W/m· K) 電容器元件之發熱溫度(最大上昇溫度)(°C ) 絶緣皮膜熱傳導材之組成 (質量部） -41 12409379 Summary Example 34 Aluminum nitride film g 1 1 1 1 0 (N 63.5 Example 33 Aluminum nitride film m 1 1 1 ο 1 〇 63.9 Example 32 Aluminum nitride film m 1 1 § 1 1 (N ( Ν 63.4 Example 32 Aluminum nitride film m 1 § 1 1 1 〇cn 63.0 Example 30 | Aluminum nitride film cn § 1 1 1 1 〇 (N 63.5 Type thickness (μm) Aluminum particles (average particle size 2 · 5μηι) Aluminum nitride particles (average particle diameter 1.5μηι) Boron nitride particles (average particle diameter 2.0μm) Zinc oxide particles (average particle diameter 2.0μm) Thermal conductivity of denatured silicone oil silicone oil heat conductive material (W / m · K) Heating temperature (maximum rising temperature) of capacitor element (° C) Composition of insulation film heat conducting material (mass part) -41 1240937

實施例41 氧化鋁皮膜 § 1 1 1 1 On 63.6 實施例40 氧化鋁皮膜 1 1 1 g 1 〇 65.2 實施例39 氧化鋁皮膜 1 鲁 § 1 1 Η 63.4 實施例38 氧化鋁皮膜 » § 1 1 1 63.8 實施例37 氧化鋁皮膜 1 1 1 〇 1 寸 CN 63.3 實施例36 氧化鋁皮膜 ο 1 1 1 1 64.0 實施例35 氧化鋁皮膜 to g 1 1 1 1 Ο) 63.6 種類厚度(μ m) 鋁微粒(平均粒徑2.5μηι) 氮化鋁微粒(平均粒徑1 ·5μ m ) 氮化硼微粒(平均粒徑2.0μ m) 氧化鋅微粒(平均粒徑2.0μ m) 聚丙烯聚乙烯熱傳導材之熱傳導率(W/m · Κ) 電容器元件之發熱溫度(最大上昇溫度)(°C )丨絶緣皮膜熱傳導材之組成 (質量部） -42- 1240937Example 41 Alumina film § 1 1 1 1 On 63.6 Example 40 Alumina film 1 1 1 g 1 〇 65.2 Example 39 Alumina film 1 Lu § 1 1 Η 63.4 Example 38 Alumina film »§ 1 1 1 63.8 Example 37 Alumina film 1 1 1 〇1 inch CN 63.3 Example 36 Alumina film ο 1 1 1 1 64.0 Example 35 Alumina film to g 1 1 1 1 0) 63.6 Type thickness (μm) Aluminum particles (Average particle diameter 2.5 μηι) aluminum nitride particles (average particle diameter 1.5 μm) boron nitride particles (average particle diameter 2.0 μm) zinc oxide particles (average particle diameter 2.0 μm) Thermal conductivity (W / m · Κ) Heating temperature (maximum rising temperature) of the capacitor element (° C) 丨 Insulation film heat conductive material composition (mass part) -42- 1240937

8漱實施例48 氮化鋁皮膜 § 1 1 1 1 On 63.6 實施例47 1_ 氮化鋁皮膜 m 1 1 1 § 1 〇 65.2 實施例46 氮化隹呂 I皮膜 cn 1 1 § 1 1 63.4 1實施例45 氮化鋁皮膜個 g 1 1 暑 63.8 :實施例44 氮化鋁 i皮膜 m 1 1 1 〇 1 寸 CN 63.3 實施例43 氮化鋁皮膜 m ο 着 1 1 〇 m 1 64.0 實施例42 氮化鋁皮膜 m § 1 1 1 1 C) 63.6 種類厚度(μ m) 鋁微粒(平均粒徑2.5μπι) 氮化鋁微粒(平均粒徑1·5μηι) 氮化硼微粒(平均粒徑2·0μ m ) 氧化鋅微粒(平均粒徑2·0μ m ) 聚丙烯聚乙烯熱傳導材之熱傳導率(W/m · K) 電容器元件之發熱溫度(最大上昇溫度)(°C ) 絶緣皮膜熱傳導材之組成 (質量部） -43- (41) 1240937 由表4〜8可了解，本發明之實施例1 9〜48之電解電容器’其散熱性優異，且可有效地抑制由電容器元件之發熱導致的溫度上昇。並且，使用上述熱傳導率爲1 W/m · K 以上之熱傳導材之實施例2 5〜4 8之電解電容器，可抑制由電容器元件之發熱導致的溫度上昇。相對於此，比較例3 之電解電容器的散熱性不充分，因此由電容器元件之發熱導致的溫度上昇很大。在此所用的用語及說明，係爲了說明本發明之實施形態所使用者，本發明並不限定於此。本發明在申請專利範圍內，只要不違離其精神的話，可容許設計變更。〔產業上利用之可行性〕本發明之電解電容器，係散熱性優異，且耐用壽命長’因而可使用於例如電子機器等之中。【圖式簡單說明】第1圖係顯示第1發明之電解電容器的一個實施形態之縱剖面圖。第2圖係顯示第2發明之電解電容器的一個實施形態之縱剖面圖。第3圖係顯示習知之電解電容器之縱剖面圖。【主要元件符號說明】 1 電解電容器 -44- (42) 1240937 2 電容器元件 3，1〇〇外裝殼體 4 絕緣皮膜 5 熱傳導材 6 封口構件 7 電極端子Example 8 48 Aluminum Nitride Film § 1 1 1 1 On 63.6 Example 47 1_ Aluminum Nitride Film m 1 1 1 § 1 〇 65.2 Example 46 Nitrile I Film Icn 1 1 § 1 1 63.4 1 Implementation Example 45 Aluminum nitride film g 1 1 2 63.8: Example 44 Aluminum nitride i film m 1 1 1 〇1 inch CN 63.3 Example 43 Aluminum nitride film m ο 1 1 0 m 1 64.0 Example 42 Nitrogen Aluminum film m § 1 1 1 1 C) 63.6 Type thickness (μm) Aluminum particles (average particle diameter 2.5 μm) Aluminum nitride particles (average particle diameter 1.5 μm) Boron nitride particles (average particle diameter 2.0 μ m) Zinc oxide particles (average particle size 2.0 μm) Thermal conductivity of polypropylene polyethylene heat conductive material (W / m · K) Heating temperature of capacitor element (maximum rising temperature) (° C) Composition of insulating film heat conductive material (Quality Section) -43- (41) 1240937 As can be understood from Tables 4 to 8, the electrolytic capacitors 9 to 48 according to the embodiments 1 of the present invention are excellent in heat dissipation and can effectively suppress the temperature caused by the heat generation of the capacitor element. rise. In addition, the electrolytic capacitors of Examples 2 5 to 48 using the above-mentioned thermally conductive material having a thermal conductivity of 1 W / m · K or more can suppress the temperature rise caused by the heat generation of the capacitor element. On the other hand, since the electrolytic capacitor of Comparative Example 3 has insufficient heat dissipation, the temperature rise due to heat generation of the capacitor element is large. The terms and descriptions used herein are for the purpose of explaining the embodiments of the present invention, and the present invention is not limited thereto. Within the scope of the patent application of the present invention, design changes are allowed as long as it does not depart from the spirit thereof. [Feasibility of Industrial Utilization] The electrolytic capacitor of the present invention is excellent in heat dissipation and has a long durability and lifespan. Therefore, it can be used in, for example, electronic equipment. [Brief description of the drawings] Fig. 1 is a longitudinal sectional view showing an embodiment of the electrolytic capacitor of the first invention. Fig. 2 is a longitudinal sectional view showing an embodiment of the electrolytic capacitor of the second invention. Fig. 3 is a longitudinal sectional view showing a conventional electrolytic capacitor. [Description of Symbols of Main Components] 1 Electrolytic Capacitor -44- (42) 1240937 2 Capacitor Element 3, 100 Outer Case 4 Insulation Film 5 Heat Conducting Material 6 Sealing Member 7 Electrode Terminal

8 導線 1 0 1封套8 lead 1 0 1 envelope

-45--45-

Claims

1240937 (1) X. Application for patent scope 1. An electrolytic capacitor, which is directed to an electrolytic capacitor in which a capacitor element is housed in an outer case. It is characterized in that: an intermediate between the outer case and the capacitor element A thermally conductive material with a thermal conductivity of 1 W / m · K or more in contact with them is installed. 2. The electrolytic capacitor according to item 1 of the scope of patent application, in which the above-mentioned thermally conductive material having a thermal conductivity of 1 W / m · K or more is made of fine particles, aluminum nitride particles, boron nitride particles, and oxides. One or two or more kinds of particles selected from the group consisting of zinc particles are diffused in a heat conductive material made of a base material. 3 * The electrolytic capacitor according to item 1 of the scope of patent application, wherein the thermally conductive material having a thermal conductivity of 1 w / m · K or more is a thermally conductive material made by diffusing aluminum particles into a base material. 4. The electrolytic capacitor according to item 2 or 3 of the scope of patent application, wherein the average particle diameter of the fine particles is 0.5 to 5 μΓα. 5. The electrolytic capacitor according to item 2 or 3 of the scope of patent application, wherein the content of the fine particles in the heat conductive material is 70% by mass or more. 6 · The electrolytic capacitor according to item 2 or 3 of the scope of patent application, in which the above-mentioned base material is made of silicone oil and / or modified silicone oil. 7. The electrolytic capacitor according to item 2 or 3 of the scope of patent application, wherein the base material is made of synthetic resin. 8. The electrolytic capacitor according to item 7 of the scope of patent application, wherein the synthetic resin is a polyolefin. -46- 1240937 (2) 9 · For the electrolytic capacitors described in item 8 of the patent application, it is preferable to use polypropylene or / and polyethylene for the above-mentioned polysmoke. 10. The electrolytic capacitor according to any one of the claims 1 to 3, wherein 30% or more of the height of the capacitor element is in contact with the heat conductive material. 11. The electrolytic capacitor according to any one of items 1 to 3 of the patent application table, wherein the outer case is made of aluminum. 12. The electrolytic capacitor as described in any one of items 1 to 3 of the applied patent, which is an aluminum electrolytic capacitor. 13. The electrolytic capacitor according to any one of claims 1 to 3, wherein the capacitor element is formed by winding a separator between an anode foil and a cathode foil. 14. An electrolytic capacitor valley 1 'is an electrolytic capacitor for accommodating a capacitor element in an aluminum outer case, characterized in that the outer peripheral surface of the outer case is covered with an insulating film. 15. The electrolytic capacitor according to item 14 of the scope of patent application, wherein the insulating film is an aluminum oxide film. 16. The electrolytic capacitor according to item 14 in the scope of the patent application, wherein the insulating film is an aluminum nitride film. 1 7 · —An electrolytic capacitor 'is an electrolytic capacitor for accommodating capacitor elements in an aluminum outer case, characterized in that the outer peripheral surface of the outer case is an anodized film formed by surface treatment. 18. An electrolytic capacitor 'is intended to house capacitor components -47-1240937 (3) An electrolytic capacitor in an outer case of inscriptions, characterized in that the outer peripheral surface of the outer case is' surfaced' It is covered with an aluminum nitride film formed by nitriding. 19. The electrolytic capacitor according to any one of the items Nos. 4 to 8 in the scope of the patent application, wherein the thickness of the film is 1 to 20 μm. 20. The electrolytic capacitor according to any one of item 8 of the scope of patent application, wherein a thermal conductivity of 1 W / m is in the state of contact between the outer case and the capacitor element. · Thermal conductive material above KK. 2 1. The electrolytic capacitor according to item 20 of the scope of the patent application, wherein the above-mentioned thermally conductive material having a thermal conductivity of 1 W / m · K or more is made of aluminum fine particles, aluminum nitride fine particles, boron nitride fine particles, and One or two or more kinds of particles selected from the group consisting of zinc oxide particles are diffused in a heat conductive material made of a base material. 22. The electrolytic capacitor according to item 20 of the scope of patent application, wherein the heat conductive material having a thermal conductivity of 1 W / m · K or more is a heat conductive material made by diffusing aluminum particles into a base material. 23. The electrolytic capacitor according to item 21 of the scope of patent application, wherein the average particle diameter of the fine particles is 0.5 to 5 μm. 24. The electrolytic capacitor according to item 21 in the scope of the patent application, wherein the content of the fine particles in the heat conductive material is 70% by mass or more. 25. The electrolytic capacitor according to item 21 of the scope of the patent application, wherein in the above-mentioned base material, silicone oil or / and modified silicone oil can be used. -48- 1240937 (4) 2 6. The electrolytic capacitor according to item 21 of the scope of patent application, wherein a synthetic resin can be used for the base material. 2 7 * The electrolytic capacitor according to item 26 of the scope of patent application, wherein the synthetic resin is a polyolefin. 2 8. The electrolytic capacitor according to item 27 in the scope of the patent application, wherein the polyolefin is polypropylene or polyethylene. 29. The electrolytic capacitor according to item 20 of the scope of patent application, wherein more than 30% of the height of the capacitor element is in contact with the heat conductive material. 30. The electrolytic capacitor according to any one of claims 14 to 18 in the scope of patent application, which is an electrolytic capacitor made of aluminum. 3 1 · The electrolytic capacitor according to any one of claims 1 to 18 in the scope of the application for a patent, wherein the capacitor element is formed by winding a separator interposed between an anode electrode and a cathode foil.

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