JP2007059650A - Coin-shaped storage cell - Google Patents

Coin-shaped storage cell Download PDF

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JP2007059650A
JP2007059650A JP2005243858A JP2005243858A JP2007059650A JP 2007059650 A JP2007059650 A JP 2007059650A JP 2005243858 A JP2005243858 A JP 2005243858A JP 2005243858 A JP2005243858 A JP 2005243858A JP 2007059650 A JP2007059650 A JP 2007059650A
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metal case
coin
upper lid
storage cell
external terminal
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Koichi Morikawa
幸一 森川
Shigeo Shinpo
成生 新保
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02E60/13—Energy storage using capacitors

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  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coin-shaped storage cell with improved liquid-leakage resistance during reflow soldering for processing at a higher temperature than usual. <P>SOLUTION: The coin-shaped storage cell is composed of an element in which a pair of electrodes 16 is arranged oppositely to each other via an insulating separator 18, and an upper lid 13 (a cathode side) for hermetically sealing the element via insulating annular packing 15 after storing the element in a metal case 11 (an anode side). The coin-shaped storage cell is composed of a structure in which a face contacting the electrodes 16 of the metal case 11 is internally extruded, a step-like external terminal 20 is connected to the outer face of the internally extruded metal case 11, and a step-like external terminal 21 is connected to the outer face of the upper lid 13 so that its tip is flush with the tip of the external terminal 20 on the metal case 11 side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はコンデンサや電池等の電気化学セルの中で、特に面実装用に用いられる外部端子を有したコイン形蓄電セルに関するものである。   The present invention relates to a coin-type energy storage cell having an external terminal used for surface mounting among electrochemical cells such as capacitors and batteries.

この種のコイン形蓄電セルには、電気二重層コンデンサやボタン電池等があり、図４はコイン形電気二重層コンデンサの構成を示す一部切り欠き断面図である。同図において、活性炭電極からなる陽極性の分極性電極３１と、活性炭電極からなる陰極側の分極性電極３２とをセパレータ３３を介して対向配置し、そして陽極側の分極性電極３１には陽極集電体３４を設け、かつ陰極側の分極電極３２には陰極集電体３５を設け、その後、前記一対の分極性電極３１,３２およびセパレータ３３に電解液３６を含浸させて、これらを陰極端子となる上ケース３７と陽極端子となる下ケース３８で構成される収納空間部に収納し、そして上ケース３７の外周部に形成した折り曲げ部４０と下ケース３８の外周部との間に電気絶縁性を有するパッキン３９を配置して下ケース３８の外周部の先端部４１をカーリングすることにより、パッキン３９で上ケース３７の折り曲げ部４０を外側から包み込んで一対の分極性電極３１,３２を収納している収納空間部の気密封口を行うようにしている。   This type of coin-type storage cell includes an electric double layer capacitor, a button battery, and the like, and FIG. 4 is a partially cutaway cross-sectional view showing the configuration of the coin-type electric double layer capacitor. In the figure, an anodic polarizable electrode 31 made of an activated carbon electrode and a cathode-side polarizable electrode 32 made of an activated carbon electrode are arranged opposite to each other via a separator 33, and the anode-side polarizable electrode 31 has an anode A current collector 34 is provided, and a cathode current collector 35 is provided on the cathode-side polarized electrode 32, and then the pair of polarizable electrodes 31, 32 and separator 33 are impregnated with an electrolytic solution 36, and these are provided as a cathode. It is housed in a housing space composed of an upper case 37 serving as a terminal and a lower case 38 serving as an anode terminal, and is electrically connected between a bent portion 40 formed on the outer peripheral portion of the upper case 37 and the outer peripheral portion of the lower case 38. By placing the insulating packing 39 and curling the front end portion 41 of the outer periphery of the lower case 38, the bent portion 40 of the upper case 37 is wrapped from the outside by the packing 39 to form a pair of parts. The airtight opening of the storage space that stores the polar electrodes 31 and 32 is provided.

前記コイン形電気二重層コンデンサをプリント基板に実装する場合は、図５（ａ）に示すように、コイン形電気二重層コンデンサ５０の下ケースと上ケースの外面部に夫々外部リード端子５１，５２を接続し、その外部リード端子５１，５２をプリント基板５３の孔に挿入し、その部分を半田付けして実装したものがある。また、同図（ｂ）はコイン形電気二重層コンデンサを横置きにしたもので、コイン形電気二重層コンデンサ５４の下ケースと上ケースの外面部に夫々外部リード端子５５，５６を接続し、その外部リード端子５５，５６をプリント基板５７の孔に挿入し、その部分を半田付けして実装したものである。   When the coin-type electric double layer capacitor is mounted on a printed circuit board, as shown in FIG. 5A, external lead terminals 51, 52 are respectively provided on the outer surface of the lower case and the upper case of the coin-type electric double layer capacitor 50. , The external lead terminals 51 and 52 are inserted into the holes of the printed circuit board 53, and the portions are soldered and mounted. FIG. 5B shows a coin-type electric double layer capacitor placed horizontally. External lead terminals 55 and 56 are connected to the outer surface of the lower case and the upper case of the coin-type electric double layer capacitor 54, respectively. The external lead terminals 55 and 56 are inserted into holes of the printed circuit board 57, and the portions are soldered and mounted.

また、プリント基板に実装する他の例として、例えば特許文献１，２に示すように、陽陰極外部リード端子のどちらか一方の端子をキャパシタの外周の内側に収まるように取り付け、さらにプリント基板と対向する側に設置された端子に１段以上の段差を設けることにより、プリント基板に占める占有設置面積を減少・縮小して小さくすることができるという面実装形タイプのものが提案されている。   As another example of mounting on a printed circuit board, for example, as shown in Patent Documents 1 and 2, either one of the positive cathode external lead terminals is attached so as to fit inside the outer periphery of the capacitor. A surface-mount type has been proposed in which one or more steps are provided on the terminals disposed on the opposite side, so that the occupied installation area in the printed circuit board can be reduced and reduced.

一方、ボタン電池においても、正極と負極の間にセパレータを介した電極が２つ合わせの金属容器内に収容されており、その外観構造は前記電気二重層コンデンサと同じような構成を有している。
特開２００３−９２１０２号公報 特開平８−２０３４９７号公報 On the other hand, in a button battery, an electrode with a separator interposed between a positive electrode and a negative electrode is housed in two metal containers, and its external structure is similar to that of the electric double layer capacitor. Yes.
JP 2003-92102 A JP-A-8-203497

近年、機器の小型化による電子部品の高集積化に伴い、基板上の電子部品の高集積化が進んでいる。これに適したハンダ付け方法として、リフローハンダ付けによる面実装が主流となってきている。ここで、リフローハンダ付けとは、ハンダの塗布されたプリント基板に載置した蓄電セルを基板ごと２００℃以上の高温雰囲気の炉内を通過させ、ハンダ付けを行う方法である。   In recent years, along with the high integration of electronic components due to the miniaturization of equipment, the integration of electronic components on a substrate has been advanced. As a soldering method suitable for this, surface mounting by reflow soldering has become the mainstream. Here, the reflow soldering is a method of performing soldering by passing the storage cell placed on the printed circuit board coated with solder through the furnace in a high-temperature atmosphere of 200 ° C. or more.

さらに、環境問題を考慮したハンダの鉛フリー化の進行に伴い、鉛系ハンダよりも融点が２０℃程度高い錫系のハンダによるリフローハンダ付けが行われるようになり、基板に搭載される電子部品に対しても、より高い耐熱性及びリフロー対応品の長寿命化が求められるようになってきている。   Furthermore, with the progress of lead-free solder considering environmental issues, reflow soldering with tin solder, which has a melting point of about 20 ° C. higher than that of lead solder, is performed, and electronic components mounted on the board However, higher heat resistance and longer life of reflow compatible products have been demanded.

しかしながら前記特許文献１，２のコイン形電気二重層コンデンサの実装において、ハンダ付け温度が２５０℃もしくはそれ以上に達する鉛フリーのリフローハンダ付け時に、高温状態で有機電解液の溶媒の蒸気圧が高まり、蓄電セルの内圧が著しく上昇することにより、下ケース３８とパッキン３９底面のシール面に隙間が生じ、電解液が外部に漏液するという課題がある。   However, in the mounting of the coin-type electric double layer capacitor of Patent Documents 1 and 2, the vapor pressure of the solvent of the organic electrolyte solution is increased at high temperature when lead-free reflow soldering at which the soldering temperature reaches 250 ° C. or higher. When the internal pressure of the storage cell is significantly increased, there is a problem that a gap is generated between the sealing surfaces of the lower case 38 and the bottom surface of the packing 39, and the electrolytic solution leaks to the outside.

また、外部リード端子を上ケース及び下ケースに接続するときに、レーザ溶接などで溶接すると、接続強度を保つためにレーザ溶接を強くするので、そのレーザ溶接の熱が分極性電極まで達し、分極性電極が破損され容量を維持しにくいという課題を有していた。   Also, when the external lead terminal is connected to the upper case and the lower case, welding by laser welding or the like strengthens the laser welding in order to maintain the connection strength, so that the heat of the laser welding reaches the polarizable electrode and is separated. There was a problem that the polar electrode was broken and it was difficult to maintain the capacity.

本発明はこのような従来の課題を解決し、コイン形電気化学素子の上ケースと下ケースへの外部リード端子の取り付けの強度を維持し、高温リフローに対する耐熱性を向上させた長寿命のコイン形蓄電セルを提供することを目的とするものである。   The present invention solves such conventional problems, maintains the strength of attaching external lead terminals to the upper case and lower case of the coin-shaped electrochemical element, and improves the heat resistance against high-temperature reflow. The object is to provide a battery cell.

前記課題を解決するために本発明は、一対の電極が絶縁性のセパレータを介して対面するように配置された素子と、この素子を金属ケース（陽極側）内に収納して絶縁性のリングパッキンを介して密封する上蓋（陰極側）からなるコイン形蓄電セルであって、前記金属ケースの電極と接する面を内側に押出した構造からなり、前記内側に押出した金属ケースの外面部に階段状の外部端子を接続し、かつ前記上蓋の外面部にも先端が前記金属ケース側の外部端子の先端部と同一面となるように階段状の外部端子を接続した構成とするものである。   In order to solve the above-described problems, the present invention provides an element in which a pair of electrodes are arranged to face each other via an insulating separator, and an insulating ring in which the element is housed in a metal case (anode side). A coin-type energy storage cell comprising an upper lid (cathode side) sealed through a packing, wherein the metal case has a structure in which a surface in contact with an electrode of the metal case is pushed inward, and a staircase is formed on an outer surface portion of the metal case pushed inward A stepped external terminal is connected to the outer surface of the upper lid so that the tip is flush with the tip of the external terminal on the metal case side.

本発明は、金属ケースの電極と接する面を内側に押出した構造からなり、前記内側に押出した金属ケースの外面部に階段状の外部端子を接続し、かつ前記上蓋の外面部にも先端が前記金属ケース側の外部端子の先端部と同一面となるように階段状の外部端子を接続することにより、金属ケースの底面部の半分以上がプリント基板から離すことができるため、リフローハンダ付けのときに、プリント基板と接しない部分が空気層となるので高温リフローに対する耐熱性を向上させることができ、プリント基板に占める面積を最小限の面積にすることができるという作用効果を有する。   The present invention has a structure in which a surface in contact with an electrode of a metal case is extruded inward, a stepped external terminal is connected to an outer surface portion of the metal case extruded inward, and a tip is also formed on the outer surface portion of the upper lid. By connecting a stepped external terminal so that it is flush with the tip of the external terminal on the metal case side, more than half of the bottom surface of the metal case can be separated from the printed circuit board. Sometimes, the portion not in contact with the printed circuit board becomes an air layer, so that the heat resistance against high temperature reflow can be improved, and the area occupied on the printed circuit board can be minimized.

また、金属ケース及び／または上蓋が電極と接する面を内側に押出した構造とすることから、金属ケース及び上蓋の強度が高まるので、従来よりも金属ケース及び上蓋の厚みを薄くすることができ、その結果、外部端子を接続するレーザ溶接強度も低くすることができるので、レーザ溶接による電極の破損が生じなくなり、蓄電セルの容量低下を防ぐことができるという作用効果を有する。   In addition, since the metal case and / or the upper lid has a structure in which the surface in contact with the electrode is pushed inward, the strength of the metal case and the upper lid is increased, so that the thickness of the metal case and the upper lid can be made thinner than before, As a result, since the laser welding strength for connecting the external terminal can be reduced, the electrode is not damaged by the laser welding, and the effect of reducing the capacity of the storage cell can be prevented.

図１は本発明の一実施の形態によるコイン形電気二重層コンデンサの構成を示す断面図である。同図において、金属ケース１１と上蓋１３の内底面に集電材１７をそれぞれ塗布し、一対の分極性電極１６がセパレータ１８を介して集電材１７と接触するように金属ケース１１と上蓋１３に挿入されている。また、一対の分極性電極１６には電解液１９が含浸されている。   FIG. 1 is a cross-sectional view showing a configuration of a coin-type electric double layer capacitor according to an embodiment of the present invention. In the figure, current collectors 17 are respectively applied to the inner bottom surfaces of the metal case 11 and the upper lid 13 and inserted into the metal case 11 and the upper lid 13 so that the pair of polarizable electrodes 16 are in contact with the current collector 17 via the separators 18. Has been. The pair of polarizable electrodes 16 is impregnated with an electrolytic solution 19.

そして上蓋１３の外周部に形成した折り曲げ部１４と金属ケース１１の開口部１２との間に電気絶縁性を有するリング状パッキン１５を配置して金属ケース１１の開口部１２の先端をカーリングすることにより、リング状パッキン１５で上蓋１３の折り曲げ部１４を外側から包み込んで一対の分極性電極１６を収納して気密封口を行っている。   Then, a ring-shaped packing 15 having electrical insulation is disposed between the bent portion 14 formed on the outer peripheral portion of the upper lid 13 and the opening 12 of the metal case 11 to curl the tip of the opening 12 of the metal case 11. Accordingly, the bent portion 14 of the upper lid 13 is wrapped from the outside with the ring-shaped packing 15 to accommodate the pair of polarizable electrodes 16 and perform an airtight opening.

なお、気密度をアップするために、金属ケース１１のリング状パッキン１５との接触面及びリング状パッキン１５の上蓋１３との接触面にはシール補助材を塗布して封口性を高めることもできる。   In order to increase the airtightness, a sealing auxiliary material can be applied to the contact surface of the metal case 11 with the ring-shaped packing 15 and the contact surface with the upper lid 13 of the ring-shaped packing 15 to improve the sealing performance. .

また、前記金属ケース１１は分極性電極１６と接する面を内側に押出した構造を有するもので、その内側に押出した金属ケース１１の外面部に階段状の外部端子２０をレーザ溶接により接続し、また、前記上蓋１３の外面部にも先端が金属ケース１１側の外部端子２０の先端部と同一面となるように階段状の外部端子２１をレーザ溶接により接続した構成とするものである。   Further, the metal case 11 has a structure in which a surface in contact with the polarizable electrode 16 is extruded inward, and a stepped external terminal 20 is connected to the outer surface portion of the metal case 11 extruded inward by laser welding, Further, a stepped external terminal 21 is connected to the outer surface portion of the upper lid 13 by laser welding so that the front end is flush with the front end portion of the external terminal 20 on the metal case 11 side.

以下、具体的な実施例について説明をする。   Hereinafter, specific examples will be described.

（実施例１）
まず、一対の分極性電極は、平均粒径５μｍの石油コークス系活性炭粉末と導電性付与剤として平均粒径０．０５μｍのカーボンブラック、カルボキシメチルセルロースを溶解した水溶性バインダー溶液（濃度：５０％）を１０：２：１の重量比に混合して混練機で充分に混練し、この混練品をペレット（φ４ｍｍ）に成形した後、このペレットを１００℃の大気中で１時間乾燥した。 Example 1
First, a pair of polarizable electrodes is a water-soluble binder solution (concentration: 50%) in which petroleum coke activated carbon powder having an average particle size of 5 μm and carbon black and carboxymethyl cellulose having an average particle size of 0.05 μm as a conductivity-imparting agent are dissolved. Were mixed at a weight ratio of 10: 2: 1 and sufficiently kneaded with a kneader. The kneaded product was formed into pellets (φ4 mm), and then the pellets were dried in the atmosphere at 100 ° C. for 1 hour.

次に、このペレット２枚の間にセパレータを介在させて一対の分極性電極を得て、電解液を含浸させた。この電解液の組成を（表１）に示す。   Next, a pair of polarizable electrodes was obtained by interposing a separator between the two pellets, and impregnated with an electrolytic solution. The composition of this electrolytic solution is shown in (Table 1).

Figure 2007059650
Figure 2007059650

次に、プレス加工により金属ケース（材質：ＳＵＳ 厚み１．０ｍｍ）の中心からペレットの大きさの部分を内面部に押出した部分に、カーボンペーストを塗布して形成し、その表面に前記一対の分極性電極を配置した。   Next, a carbon paste is applied to a portion of the metal case (material: SUS thickness: 1.0 mm) by pressing to a portion where the pellet size is extruded from the center to the inner surface, and the pair of surfaces is formed on the surface. A polarizable electrode was placed.

続いて、金属ケースの内側にリング状パッキンを置き、上蓋（材質：ＳＵＳ 厚み１．０ｍｍ）を被せて金属ケースの外周縁部をカーリングすることにより、リング状パッキンを金属ケースの内底面に密着させるとともに、金属ケースの開口部を密封してコイン形電気二重層コンデンサを作製した（サイズ：直径６．８ｍｍ、高さ１．４ｍｍ）。   Subsequently, the ring-shaped packing is placed inside the metal case, and the upper lid (material: SUS thickness 1.0 mm) is put on and the outer peripheral edge of the metal case is curled to adhere the ring-shaped packing to the inner bottom surface of the metal case. At the same time, the opening of the metal case was sealed to produce a coin-type electric double layer capacitor (size: diameter 6.8 mm, height 1.4 mm).

次に、内側に押出した金属ケースの外面部に階段状の外部端子（材質：ＳＵＳ 厚み１．０ｍｍ 幅３．０ｍｍ）をレーザ溶接により接続した。また、上蓋の外面部にも、先端が金属ケース側の外部端子（材質：ＳＵＳ 厚み１．０ｍｍ 幅３．０ｍｍ）の先端部と同一面となるように階段状の外部端子をレーザ溶接により接続した。   Next, stepped external terminals (material: SUS thickness 1.0 mm width 3.0 mm) were connected to the outer surface of the metal case extruded inward by laser welding. Also, a stepped external terminal is connected to the outer surface of the upper lid by laser welding so that the tip is flush with the tip of the external terminal on the metal case side (material: SUS thickness 1.0 mm, width 3.0 mm). did.

（実施例２）
前記実施例１において、金属ケース及び上蓋のＳＵＳ材の厚みを１．３ｍｍのものを用いた以外は前記実施例１と同様にしてコイン形電気二重層コンデンサを作製した。 (Example 2)
A coin-type electric double layer capacitor was produced in the same manner as in Example 1 except that the SUS material having a thickness of 1.3 mm was used for the metal case and upper lid in Example 1.

（実施例３）
前記実施例１において、金属ケース及び上蓋のＳＵＳ材の厚みを１．５ｍｍのものを用いた以外は前記実施例１と同様にしてコイン形電気二重層コンデンサを作製した。 (Example 3)
A coin-type electric double layer capacitor was manufactured in the same manner as in Example 1 except that the SUS material having a thickness of 1.5 mm was used for the metal case and the upper lid in Example 1.

（実施例４）
前記実施例１において、上蓋の形状を図２に示すように、上蓋の電極と接する面を内側に押出した構造のものを用いた以外は前記実施例１と同様にしてコイン形電気二重層コンデンサを作製した。 Example 4
In the first embodiment, a coin-type electric double layer capacitor is formed in the same manner as in the first embodiment, except that the upper lid has a structure in which the surface in contact with the electrode of the upper lid is extruded inward as shown in FIG. Was made.

（実施例５）
前記実施例１において、金属ケースの外部端子を接続する面を、プレス加工（凸金型の表面に凹凸を設ける）により金属ケースの内側に押出すと同時に凹凸の粗面化（平均表面粗さＲａ０．２μｍ）した以外は前記実施例１と同様にしてコイン形電気二重層コンデンサを作製した。 (Example 5)
In Example 1, the surface to which the external terminal of the metal case is connected is extruded into the metal case by pressing (providing irregularities on the surface of the convex mold), and at the same time, the irregularities are roughened (average surface roughness). A coin-type electric double layer capacitor was produced in the same manner as in Example 1 except that Ra 0.2 μm).

（実施例６）
前記実施例４において、上蓋の外部端子を接続する面を、プレス加工（凸金型の表面に凹凸を設ける）により上蓋の内側に押出すと同時に凹凸の粗面化（平均表面粗さＲａ０．２μｍ）した以外は前記実施例４と同様にしてコイン形電気二重層コンデンサを作製した。 (Example 6)
In Example 4, the surface to which the external terminal of the upper lid is connected is extruded inside the upper lid by pressing (providing irregularities on the surface of the convex mold) and at the same time roughening of the irregularities (average surface roughness Ra0. A coin-type electric double layer capacitor was fabricated in the same manner as in Example 4 except that 2 μm).

（比較例１）
前記実施例１において、内側に押出していない金属ケース（材質：ＳＵＳ 厚み１．５ｍｍ）と上蓋（材質：ＳＵＳ 厚み１．５ｍｍ）を使用した以外は前記実施例１と同様にしてコイン形電気二重層コンデンサを作製した。 (Comparative Example 1)
In the first embodiment, a coin-type electric double battery was used in the same manner as in the first embodiment except that a metal case (material: SUS thickness 1.5 mm) and an upper lid (material: SUS thickness 1.5 mm) which were not pushed inward were used. A multilayer capacitor was produced.

なお、実施例１〜６と比較例１での外部端子の接続するときのレーザ溶接条件は一定条件で行った。   In addition, the laser welding conditions when connecting the external terminals in Examples 1 to 6 and Comparative Example 1 were performed under constant conditions.

前記実施例１〜６と比較例１のコイン形電気二重層コンデンサについて、図３に示す温度プロファイルでリフローハンダ付けを行い、その容量変化と漏液の検査結果を（表２）に示す。また、金属ケース及び上蓋の厚みとレーザ溶接との適性を外部端子間の抵抗値より判定した。なお、サンプル数は２０個であり、容量変化はリフロー前後の容量変化率である。   The coin-type electric double layer capacitors of Examples 1 to 6 and Comparative Example 1 are subjected to reflow soldering with the temperature profile shown in FIG. 3, and the change in capacity and the inspection result of liquid leakage are shown in Table 2. In addition, the suitability of the thickness of the metal case and the upper lid and laser welding was determined from the resistance value between the external terminals. The number of samples is 20, and the capacity change is the capacity change rate before and after reflow.

Figure 2007059650
Figure 2007059650

（表２）から明らかなように、前記実施例１〜６のコイン形電気二重層コンデンサは比較例１のコイン形電気二重層コンデンサに比べて、リング状パッキンから外部に漏液がなく、極めて安定したコイン形電気二重層コンデンサを得ることができた。   As can be seen from (Table 2), the coin-type electric double layer capacitors of Examples 1 to 6 have no leakage from the ring packing to the outside as compared with the coin-type electric double layer capacitor of Comparative Example 1. A stable coin-type electric double layer capacitor could be obtained.

また、金属ケース及び上蓋のＳＵＳ材の厚みを１．０〜１．３ｍｍにすることにより、外部端子との接続強度が強くなり、その接触抵抗も小さいものが得られる。   Further, by setting the thickness of the SUS material of the metal case and the upper lid to 1.0 to 1.3 mm, the connection strength with the external terminal is increased and the contact resistance is small.

さらに、金属ケース及び上蓋の電極と接する面を内側に押出した構造を有することにより、ＳＵＳ材の厚みを１．０ｍｍと薄い材料を用いてもレーザ溶接による電極の破損が生じることなく、外部端子との接続強度を維持し、蓄電セルの容量低下を防ぐことができる。   Furthermore, by having a structure in which the surface of the metal case and the upper lid that is in contact with the electrode is pushed inward, the external terminal is not damaged even if a SUS material with a thickness of 1.0 mm is used. The connection strength between the storage cell and the capacity of the storage cell can be prevented from decreasing.

このように本発明のコイン形蓄電セルは、金属ケースの電極と接する面を内側に押出した構造からなり、その外面部に階段状の外部端子を接続することにより、金属ケースの底面部の半分以上がプリント基板から離すことができるため、リフローハンダ付けのときに、プリント基板と接しない部分が空気層となるので高温リフローに対する耐熱性を向上させることができ、プリント基板に占める面積を最小限の面積にすることができるという効果を奏する。また、金属ケースが電極と接する面を内側に押出した構造とすることから、金属ケースの強度が高まるので、従来よりも金属ケースの厚みを薄くすることができ、その結果、外部端子を接続するレーザ溶接強度も低くすることができるので、レーザ溶接による電極の破損が生じなくなり、蓄電セルの容量低下を防ぐことができるという効果を奏するものである。   As described above, the coin-type energy storage cell of the present invention has a structure in which the surface in contact with the electrode of the metal case is pushed inward, and by connecting a stepped external terminal to the outer surface portion thereof, half of the bottom surface portion of the metal case is formed. Since the above can be separated from the printed circuit board, when reflow soldering, the part not in contact with the printed circuit board becomes an air layer, which can improve the heat resistance against high temperature reflow and minimize the area occupied by the printed circuit board. There is an effect that the area can be reduced. Moreover, since the metal case has a structure in which the surface in contact with the electrode is pushed inward, the strength of the metal case is increased, so that the thickness of the metal case can be made thinner than before, and as a result, the external terminal is connected. Since the laser welding strength can also be lowered, the electrode is not damaged by laser welding, and the effect of preventing a reduction in the capacity of the storage cell can be achieved.

なお、本実施の形態では電気二重層コンデンサについて説明をしたが、コイン形電池などのコイン形蓄電セルにも用いることができるものである。   Although the electric double layer capacitor has been described in the present embodiment, it can also be used for a coin-type storage cell such as a coin-type battery.

本発明のコイン形蓄電セルは、高温リフロー時の内圧上昇に耐えうるシール性を有し、鉛フリーのリフローハンダ付けによる面実装が必要な電子機器の主電源及びメモリバックアップ電源として有用である。   The coin-type energy storage cell of the present invention has a sealing property that can withstand an increase in internal pressure during high-temperature reflow, and is useful as a main power source and a memory backup power source for electronic devices that require surface mounting by lead-free reflow soldering.

本発明の一実施の形態によるコイン形電気二重層コンデンサの構成を示す断面図Sectional drawing which shows the structure of the coin-shaped electric double layer capacitor by one embodiment of this invention 同実施例４による上蓋の形状を示す断面図Sectional drawing which shows the shape of the upper cover by the Example 4 リフローハンダ付けの温度プロファイルを示す図Diagram showing temperature profile for reflow soldering 従来のコイン形電気二重層コンデンサの一部切り欠き断面図Partial cutaway view of a conventional coin-type electric double layer capacitor （ａ）同コイン形電気二重層コンデンサを実装したときの側面図、（ｂ）同他の実装の例を示す側面図(A) Side view when the same coin-type electric double layer capacitor is mounted, (b) Side view showing another mounting example

符号の説明Explanation of symbols

１１ 金属ケース
１２ 金属ケースの開口部
１３ 上蓋
１４ 上蓋の折り曲げ部
１５ リング状パッキン
１６ 分極性電極
１７ 集電材
１８ セパレータ
１９ 電解液
２０ 金属ケース側の外部端子
２１ 上蓋側の外部端子 DESCRIPTION OF SYMBOLS 11 Metal case 12 Opening part of metal case 13 Upper lid 14 Bending part of upper lid 15 Ring-shaped packing 16 Polarization electrode 17 Current collector 18 Separator 19 Electrolytic solution 20 External terminal on metal case 21 External terminal on upper lid side

Claims (3)

一対の電極が絶縁性のセパレータを介して対面するように配置された素子と、この素子を金属ケース（陽極側）内に収納して絶縁性のリングパッキンを介して密封する上蓋（陰極側）からなるコイン形蓄電セルであって、前記金属ケースの電極と接する面を内側に押出した構造からなり、前記内側に押出した金属ケースの外面部に階段状の外部端子を接続し、かつ前記上蓋の外面部にも先端が前記金属ケース側の外部端子の先端部と同一面となるように階段状の外部端子を接続したコイン形蓄電セル。 An element in which a pair of electrodes are arranged to face each other via an insulating separator, and an upper lid (cathode side) that houses the element in a metal case (anode side) and seals it via an insulating ring packing A coin-shaped storage cell comprising a structure in which a surface in contact with an electrode of the metal case is extruded inward, a stepped external terminal is connected to an outer surface portion of the metal case extruded inward, and the upper lid A coin-shaped storage cell in which a stepped external terminal is connected to the outer surface of the metal case so that the tip is flush with the tip of the external terminal on the metal case side. 前記上蓋の電極と接する面を内側に押出した構造からなる請求項１に記載のコイン形蓄電セル。 The coin-type energy storage cell according to claim 1, comprising a structure in which a surface in contact with the electrode of the upper lid is pushed inward. 前記内側に押し出した金属ケース及び／または上蓋の外面部に凹凸加工が施され、その部分に外部端子を接続した請求項１または２に記載のコイン形蓄電セル。 3. The coin-type storage cell according to claim 1, wherein the metal case and / or the outer surface of the upper lid that are pushed inward are provided with irregularities, and an external terminal is connected to that portion.
JP2005243858A 2005-08-25 2005-08-25 Coin-shaped storage cell Pending JP2007059650A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008251453A (en) * 2007-03-30 2008-10-16 Fdk Energy Co Ltd Metal component for battery, its manufacturing method, and battery
CN104900415A (en) * 2015-05-27 2015-09-09 湖北金泉新材料有限责任公司 Cell capacitor
CN111564651A (en) * 2020-05-12 2020-08-21 路华置富电子(深圳)有限公司 Lap winding cell battery
WO2022007031A1 (en) * 2020-07-10 2022-01-13 瑞声声学科技(深圳)有限公司 Button battery

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008251453A (en) * 2007-03-30 2008-10-16 Fdk Energy Co Ltd Metal component for battery, its manufacturing method, and battery
CN104900415A (en) * 2015-05-27 2015-09-09 湖北金泉新材料有限责任公司 Cell capacitor
CN111564651A (en) * 2020-05-12 2020-08-21 路华置富电子(深圳)有限公司 Lap winding cell battery
CN111564651B (en) * 2020-05-12 2024-01-19 路华置富电子(深圳)有限公司 Lap wound cell
WO2022007031A1 (en) * 2020-07-10 2022-01-13 瑞声声学科技(深圳)有限公司 Button battery

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