JP2006286561A - Sealing plate for sealed battery - Google Patents
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- JP2006286561A JP2006286561A JP2005108369A JP2005108369A JP2006286561A JP 2006286561 A JP2006286561 A JP 2006286561A JP 2005108369 A JP2005108369 A JP 2005108369A JP 2005108369 A JP2005108369 A JP 2005108369A JP 2006286561 A JP2006286561 A JP 2006286561A
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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
- Y02E60/10—Energy storage using batteries
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Abstract
【課題】リング状基部とその周縁部から上方へ延出した筒状部からなる絶縁性のインナーガスケットを用い、上下部金属箔の中央部同士が溶接により電気的に接続し、両金属箔の周縁部の間に前記インナーガスケットのリング状基部を介在させ、両金属箔の周縁部の上面には、金属板スペーサと外部端子を兼ねた金属キャップとが載置され、前記金属キャップ、前記上部金属箔、前記インナーガスケット、および前記下部金属箔が、ガス通気孔を有する有底皿形状の金属ケースの内部に収納され、前記金属ケースの開口端部を内側にかしめて密封した封口板であって、電池内圧上昇時に、所定の圧力で安全機構を確実に作動させることができ、気密性に優れ、安全性が高い密閉型電池用封口板を提供する。
【解決手段】金属板スペーサとして、表面粗さＲａの値が０．１μｍ以上のものを用いる。
【選択図】図１
An insulating inner gasket comprising a ring-shaped base portion and a cylindrical portion extending upward from the peripheral portion thereof is used, and the central portions of upper and lower metal foils are electrically connected to each other by welding so that both metal foils are A ring-shaped base portion of the inner gasket is interposed between the peripheral portions, and a metal cap serving as a metal plate spacer and an external terminal is placed on the upper surfaces of the peripheral portions of both metal foils. The metal foil, the inner gasket, and the lower metal foil are housed in a bottomed dish-shaped metal case having gas vent holes, and are sealing plates that are sealed by caulking the open end of the metal case inward. Thus, it is possible to provide a sealed battery sealing plate that is capable of reliably operating a safety mechanism at a predetermined pressure when the battery internal pressure rises, has excellent airtightness, and high safety.
A metal plate spacer having a surface roughness Ra of 0.1 μm or more is used.
[Selection] Figure 1
Description
本発明は、気密性に優れ、電池内圧上昇時の安全機構に優れた密閉型電池用封口板に関する。 The present invention relates to a sealing battery sealing plate that is excellent in airtightness and excellent in a safety mechanism when the internal pressure of a battery is increased.
小型携帯機器等の駆動用電源に、高容量のアルカリ蓄電池に代表される水系電解液二次電池や、リチウムイオン二次電池に代表される非水電解液二次電池が使われている。その中でも非水電解液二次電池は、エネルギー密度が高く、サイクル特性などの電池特性に優れた密閉型電池である。 A water-based electrolyte secondary battery typified by a high-capacity alkaline storage battery or a non-aqueous electrolyte secondary battery typified by a lithium ion secondary battery is used as a driving power source for a small portable device or the like. Among them, the non-aqueous electrolyte secondary battery is a sealed battery having high energy density and excellent battery characteristics such as cycle characteristics.
エネルギー密度が高い密閉型電池は、充電器の故障による過充電や、電池の誤使用によって、電池が過充電された場合、電池内部の非水電解液が分解してガスが発生し、電池内圧が上昇する可能性がある。この電池内圧が所定の値に達すると、封口板内に設置された金属箔が破断し、ガスを電池外部に排出することができるようにしている。さらに金属箔が破断し排出すると共に、電流を遮断する安全機構も設けられている。 When the battery is overcharged due to overcharge due to a failure of the charger or misuse of the battery, the nonaqueous electrolyte inside the battery decomposes and generates gas, and the internal battery pressure is high. May rise. When the internal pressure of the battery reaches a predetermined value, the metal foil installed in the sealing plate is broken so that the gas can be discharged outside the battery. In addition, a safety mechanism is provided to cut off and discharge the metal foil and cut off the current.
安全機構を有する封口板は、一般的に、リング状基部とその周縁部から上方へ延出した筒状部からなる絶縁性のインナーガスケットを用い、上下金属箔の中央部同士が溶接により電気的に接続し、両金属箔の周縁部の間に前記インナーガスケットのリング状基部を介在させ、両金属箔の周縁部の上面には、金属スペーサと外部端子を兼ねた金属キャップとが載置され、金属キャップ、上部金属箔、インナーガスケット、および下部金属箔が、ガス通気孔を有する有底皿形状の金属ケースの内部に収納され、この金属ケースの開口端部を内側にかしめて密封した構造をしている。したがって、電流は金属ケース、下部金属箔、上部金属箔、金属スペーサ、および金属キャップの順に流れる。 A sealing plate having a safety mechanism generally uses an insulating inner gasket composed of a ring-shaped base and a cylindrical portion extending upward from its peripheral edge, and the central portions of the upper and lower metal foils are electrically connected by welding. A ring-shaped base portion of the inner gasket is interposed between the peripheral portions of both metal foils, and a metal cap serving as a metal spacer and an external terminal is placed on the upper surfaces of the peripheral portions of both metal foils. , Metal cap, upper metal foil, inner gasket, and lower metal foil are housed inside a bottomed dish-shaped metal case with gas vents, and the open end of this metal case is crimped inward and sealed I am doing. Accordingly, current flows in the order of the metal case, the lower metal foil, the upper metal foil, the metal spacer, and the metal cap.
従来、所定の圧力で確実に安全機構を作動させるための封口板が提案されている（例えば、特許文献１参照）。封口板の下部金属箔には、通気孔を有し中央部分が上方へ向け膨出した可撓性を有する凸状部が設けられ、かつ前記凸状部に易破断部を設け、上部金属箔には、中央部分が下方へ向け膨出した可撓性を有する凹状部が設けられている。電池の内部圧力が所定値に達したときに、この電池内圧を下部金属箔の通気孔を通じて上部金属箔の凹状部は圧力方向へ変形する。この変形する応力によって、上部金属箔の凹状部がこれと溶接された下部金属箔の易破断部を破断することにより、電流が遮断される。
このような従来の密閉型電池用封口板は、上部金属箔に強度の高い材料を使用しているが、電池の小型化に伴い、電池ケース開口部の面積が小さくなり、封口板面積も必然的に小さくなる。封口板の面積が小さくなると、上部金属箔の凹状部の受圧面積が小さくなり、電池内圧が高くなったときに上部金属箔の凹状部が撓みにくくなる。その結果、下部金属箔の易破断部を破断するのに十分な応力が得られず、下部金属箔の易破断部を破断する圧力が高くなり、電流を遮断することがしにくくなる。従来の上部金属箔材料では、所定の圧力で確実に電流が遮断されることが困難になる。 Such a conventional sealed battery sealing plate uses a high-strength material for the upper metal foil. However, as the size of the battery is reduced, the area of the battery case opening is reduced, and the sealing plate area is necessarily increased. Become smaller. When the area of the sealing plate is reduced, the pressure receiving area of the concave portion of the upper metal foil is reduced, and the concave portion of the upper metal foil is difficult to bend when the battery internal pressure is increased. As a result, a stress sufficient to break the easily breakable portion of the lower metal foil cannot be obtained, and the pressure for breaking the easily breakable portion of the lower metal foil increases, making it difficult to interrupt the current. In the conventional upper metal foil material, it is difficult to reliably interrupt current at a predetermined pressure.
また、前述の金属ケースをかしめたとき、上部金属箔はインナーガスケットのリング状基部に設けられた突起と金属スペーサに挟まれる。金属箔の強度を下げた場合、上部金属箔はインナーガスケットの突起から圧縮され、圧縮を受けた上部金属箔の材料は、突起の
頂点を支点として、インナーガスケットの筒状部方向とインナーガスケットの内周方向に金属スペーサ下面をすべるように伸ばされて切れてしまい、本来必要な液密が確保できなくなる。
Further, when the above-described metal case is caulked, the upper metal foil is sandwiched between the protrusion provided on the ring-shaped base portion of the inner gasket and the metal spacer. When the strength of the metal foil is lowered, the upper metal foil is compressed from the protrusion of the inner gasket, and the material of the compressed upper metal foil receives the apex of the protrusion as a fulcrum, and the inner gasket direction of the inner gasket. The metal spacer is stretched and cut so that the lower surface of the metal spacer slides in the inner circumferential direction, and the originally required liquid tightness cannot be secured.
そこで、本発明ではこのような課題を解決するもので、気密性に優れ、より低い圧力で安全機構を確実に作動させることができる封口板を有した密閉型電池を提供することを目的とする。 Therefore, the present invention solves such a problem, and an object of the present invention is to provide a sealed battery having a sealing plate that is excellent in air tightness and can reliably operate a safety mechanism at a lower pressure. .
前記課題を解決するための本発明は、リング状基部とその周縁部から上方へ延出した筒状部からなる絶縁性のインナーガスケットを用い、上下部金属箔の中央部同士が溶接により電気的に接続し、両金属箔の周縁部の間に前記インナーガスケットのリング状基部を介在させ、両金属箔の周縁部の上面には、金属板スペーサと外部端子を兼ねた金属キャップとが載置され、前記金属キャップ、前記上部金属箔、前記インナーガスケット、および前記下部金属箔が、ガス通気孔を有する有底皿形状の金属ケースの内部に収納され、前記金属ケースの開口端部を内側にかしめて密封した封口板であって、前記金属板スペーサは、表面粗さＲａの値が０．１μｍ以上である密閉型電池用封口板である。 The present invention for solving the above-mentioned problems uses an insulating inner gasket composed of a ring-shaped base portion and a cylindrical portion extending upward from the peripheral portion thereof, and the central portions of the upper and lower metal foils are electrically connected by welding. The ring-shaped base portion of the inner gasket is interposed between the peripheral portions of both metal foils, and a metal cap serving as a metal plate spacer and an external terminal is placed on the upper surfaces of the peripheral portions of both metal foils. The metal cap, the upper metal foil, the inner gasket, and the lower metal foil are housed inside a bottomed dish-shaped metal case having a gas vent, and the opening end of the metal case is placed inside. A sealing plate that is caulked and sealed, and the metal plate spacer is a sealing plate for a sealed battery having a surface roughness Ra of 0.1 μm or more.
電池内圧上昇時において、ある所定の圧力で安全機構を確実に作動させることができ、気密性に優れ、安全性が高い密閉型電池用封口板を提供することができる。 When the battery internal pressure rises, the safety mechanism can be reliably operated at a predetermined pressure, and a sealed battery sealing plate having excellent airtightness and high safety can be provided.
本発明の密閉型電池用封口板は、電池外装ケースの開口部を絶縁性のアウターガスケットを介した封口板で、リング状基部とその周縁部から上方へ延出した筒状部からなる絶縁性のインナーガスケットを用いている。上部金属箔と下部金属箔との中央部同士が溶接により電気的に接続し、両金属箔の周縁部の間に前記インナーガスケットのリング状基部を介在させ、両金属箔の周縁部の上面には、金属板スペーサと外部端子を兼ねた金属キャップとが載置されている。この溶接方法としては、抵抗溶接、超音波溶接、レーザー溶接などがあるが、安定した溶接強度を得るためにレーザー溶接が好ましい。前記金属キャップ、前記上部金属箔、前記インナーガスケット、および前記下部金属箔が、ガス通気孔を有する有底皿形状の金属ケースの内部に収納され、前記金属ケースの開口端部を内側にかしめて密封した封口板であって、前記金属板スペーサは、表面粗さＲａの値が０．１μｍ以上である。 The sealing plate for a sealed battery of the present invention is a sealing plate having an opening of a battery outer case through an insulating outer gasket, and has an insulating property comprising a ring-shaped base portion and a cylindrical portion extending upward from its peripheral edge portion. The inner gasket is used. The central portions of the upper metal foil and the lower metal foil are electrically connected to each other by welding, and the ring-shaped base portion of the inner gasket is interposed between the peripheral portions of both metal foils, and the upper surfaces of the peripheral portions of both metal foils Is mounted with a metal plate spacer and a metal cap that also serves as an external terminal. As this welding method, there are resistance welding, ultrasonic welding, laser welding and the like, but laser welding is preferable in order to obtain stable welding strength. The metal cap, the upper metal foil, the inner gasket, and the lower metal foil are housed inside a bottomed dish-shaped metal case having a gas vent, and the opening end of the metal case is caulked inward. In the sealed sealing plate, the metal plate spacer has a surface roughness Ra of 0.1 μm or more.
前述の金属ケースをかしめたとき、上部金属箔はインナーガスケットのリング状基部に設けられた突起と金属スペーサに挟まれる。前記上部金属箔はインナーガスケットの突起から圧縮され、圧縮を受けた上部金属箔の材料は、本発明のように上部金属箔の強度を下げた場合、突起の頂点を支点として、インナーガスケットの筒状部方向とインナーガスケットの内周方向に金属スペーサした面をすべるように伸ばされて切れてしまい、本来必要な液密が確保できなくなる。金属スペーサの表面粗さが０．１μm以上であると、前記金属スペーサの下面と上部金属箔との間の摩擦で上部金属箔はすべることがなくなり、伸びて切れることなく、インナーガスケットのリング状基部を圧縮することができ、気密を確保することができる。 When the above metal case is caulked, the upper metal foil is sandwiched between the protrusion provided on the ring-shaped base of the inner gasket and the metal spacer. The upper metal foil is compressed from the protrusion of the inner gasket. When the strength of the upper metal foil is reduced as in the present invention, the material of the compressed upper metal foil is the cylinder of the inner gasket with the apex of the protrusion as a fulcrum. The surface of the metal spacer is stretched and cut so as to slide in the shape portion direction and the inner peripheral direction of the inner gasket, and the originally required liquid tightness cannot be secured. If the surface roughness of the metal spacer is 0.1 μm or more, the upper metal foil will not slip due to friction between the lower surface of the metal spacer and the upper metal foil, and it will not stretch and break. The base can be compressed and airtightness can be ensured.
金属板スペーサに電解メッキが施されているのが好ましい。メッキ物質としては、金、銀、錫、ニッケル（以下、それぞれＡｕ、Ａｇ、Ｓｎ、Ｎｉと略す）などを挙げることができるが、実使用上においてＮｉメッキが好ましい。電解メッキにすることにより、前述の理由と同様に金属スペーサの下面と上部金属箔との間の摩擦を確保することができるようになる。 The metal plate spacer is preferably electroplated. Examples of the plating substance include gold, silver, tin, and nickel (hereinafter abbreviated as Au, Ag, Sn, and Ni, respectively). Ni plating is preferable in practical use. By using electrolytic plating, the friction between the lower surface of the metal spacer and the upper metal foil can be secured in the same manner as described above.
また、上部金属箔の引張強度が５０Ｎ／ｍｍ２以下であることが好ましい。 The tensile strength of the upper metal foil is preferably 50 N / mm 2 or less.
電池の小型化に伴い封口板の面積が小さくなると、封口板の受圧面積が小さくなるため、電池内圧が高くなったときに上部金属箔の凹状部が撓みにくくなる。その結果、下部金属箔の易破断部を破断するのに十分な応力が得られず、下部金属箔の易破断部を破断する圧力が高くなり、電流を遮断することがしにくくなる。従来の電池サイズで設定されていた圧力で前記上部金属箔の変形を得るためには、引張強度が５０Ｎ／ｍｍ２以下のアルミニウム箔を使用することが好ましい。さらにアルミニウム箔の強度を低くするために、圧延後加工硬化した状態よりも３００℃〜４００℃の温度付近で完全焼鈍されることが好ましい。 When the area of the sealing plate is reduced as the battery is downsized, the pressure receiving area of the sealing plate is reduced, so that the concave portion of the upper metal foil is difficult to bend when the battery internal pressure is increased. As a result, a stress sufficient to break the easily breakable portion of the lower metal foil cannot be obtained, and the pressure for breaking the easily breakable portion of the lower metal foil increases, making it difficult to interrupt the current. In order to obtain the deformation of the upper metal foil at the pressure set by the conventional battery size, it is preferable to use an aluminum foil having a tensile strength of 50 N / mm 2 or less. Further, in order to lower the strength of the aluminum foil, it is preferable to perform complete annealing at a temperature in the vicinity of 300 ° C. to 400 ° C. rather than a state after work hardening after rolling.
厚みを薄くすることで引張強度を低くすることができるが、小型電池における実使用上の理由と、前述のレーザー溶接で安定した溶接状態を得るために厚みは０．０７ｍｍ以上が好ましい。厚みを確保し、低い引張強度を得るにはアルミニウムの純度を上げ、また実使用上９９．８５％〜９９．９９％が好ましい。これらの形態によって、所定の圧力で電流を遮断することができる。 Although the tensile strength can be lowered by reducing the thickness, the thickness is preferably 0.07 mm or more in order to obtain a practical use in a small battery and a stable welding state by the laser welding described above. In order to secure the thickness and obtain a low tensile strength, the purity of aluminum is increased, and 99.85% to 99.99% is preferable in actual use. With these forms, the current can be cut off at a predetermined pressure.
図1に本発明の一実施例である密閉型電池用封口板の概略部分縦断面図を示す。図1において、密閉型電池の封口板は上部金属箔1の中央部の窪みと下部金属箔2の中央部の窪みとがレーザーにより溶接され電気的に接続されている。両金属箔１，２の周縁部の間にインナーガスケット３のリング状基部を介在させている。上部金属箔1の上面に金属板スペーサ４が載置され、金属板スペーサ４の上面に金属キャップ５が載置されている。このように下部金属箔２、インナーガスケット３、上部金属箔１、金属板スペーサ４、金属キャップ５の順に底部中央に通気孔を有する金属ケース６に収容されている。金属ケース６の開口端部を内側にかしめて密封し封口板を作製する。 FIG. 1 is a schematic partial longitudinal sectional view of a sealing battery sealing plate according to an embodiment of the present invention. In FIG. 1, in the sealing plate of the sealed battery, a recess in the center of the upper metal foil 1 and a recess in the center of the lower metal foil 2 are welded and electrically connected by a laser. A ring-shaped base portion of the inner gasket 3 is interposed between the peripheral portions of both the metal foils 1 and 2. A metal plate spacer 4 is placed on the upper surface of the upper metal foil 1, and a metal cap 5 is placed on the upper surface of the metal plate spacer 4. Thus, the lower metal foil 2, the inner gasket 3, the upper metal foil 1, the metal plate spacer 4, and the metal cap 5 are accommodated in the metal case 6 having a vent hole in the center of the bottom. The opening end of the metal case 6 is caulked inward and sealed to produce a sealing plate.
上記金属板スペーサ４、および上部金属箔１の効果を確認するために、高さ２．７ｍｍ、幅４．６ｍｍの封口板を用いた。 In order to confirm the effects of the metal plate spacer 4 and the upper metal foil 1, a sealing plate having a height of 2.7 mm and a width of 4.6 mm was used.
以下に、金属スペーサ４について説明する。 Below, the metal spacer 4 is demonstrated.
《実施例１〜８》
金属板スペーサ４は、以下に説明する表１に示す表面粗さＲａ値とメッキの有無、種類、材質を検討した。
<< Examples 1-8 >>
The metal plate spacer 4 was examined for the surface roughness Ra value, presence / absence of plating, type, and material shown in Table 1 described below.
表面粗さＲａ値は２．２μｍで電解Ｎｉメッキのもの（実施例１）、表面粗さＲａ値は１．２μｍでメッキなしのもの（実施例２）、表面粗さＲａ値は０．８μｍで電解Ｎｉメッキのもの（実施例３）、表面粗さＲａ値は０．７μｍで電解Ａｕメッキのもの（実施例４）、表面粗さＲａ値は０．３μｍで無電解Ｓｎメッキのもの（実施例５）、表面粗さＲａ値は０．２μｍで無電解Ｎｉメッキのもの（実施例６）、表面粗さＲａ値は０．１８μｍで無電解Ｎｉメッキもの（実施例７）、表面粗さＲａ値は０．１２μｍでメッキなしのもの（実施例８）を使用した。 Surface roughness Ra value is 2.2 μm and electrolytic Ni plating (Example 1), surface roughness Ra value is 1.2 μm and no plating (Example 2), surface roughness Ra value is 0.8 μm Electrolytic Ni plating (Example 3), surface roughness Ra value of 0.7 μm and electrolytic Au plating (Example 4), surface roughness Ra value of 0.3 μm and electroless Sn plating (Example 3) Example 5), surface roughness Ra value of 0.2 μm with electroless Ni plating (Example 6), surface roughness Ra value of 0.18 μm with electroless Ni plating (Example 7), surface roughness The Ra value was 0.12 μm and no plating (Example 8) was used.
《比較例１》
金属板スペーサ４には、以下に説明する表１に示す表面粗さＲａ値が０．０８μｍで電解Ｎｉメッキを施したのもの（比較例１）を使用した。
なお、実施例１〜４、比較例１については、上部金属箔にはＡ１Ｎ９０−Ｏ材の厚み０．０７５ｍｍのアルミニウム箔を使用した。
<< Comparative Example 1 >>
As the metal plate spacer 4, one having a surface roughness Ra value of 0.08 μm shown in Table 1 described below and subjected to electrolytic Ni plating (Comparative Example 1) was used.
In addition, about Examples 1-4 and the comparative example 1, the aluminum foil of thickness 0.075mm of A1N90-O material was used for the upper metal foil.
この金属板スペーサ４、および上部金属箔１を使用し封口板を組み立てた。各々の場合で１０個ずつ封口板を作製し、樹脂中に埋め込み切断し、断面を得て、上部金属箔１の圧縮率を測定した。圧縮率は（数１）で定義する。 A sealing plate was assembled using the metal plate spacer 4 and the upper metal foil 1. In each case, ten sealing plates were prepared, embedded and cut in a resin, a cross section was obtained, and the compressibility of the upper metal foil 1 was measured. The compression rate is defined by (Equation 1).
圧縮率が大きくなるほど上部金属箔は圧縮され、切れる傾向があることになる。 As the compression ratio increases, the upper metal foil is compressed and tends to break.
また、各場合で３個ずつヘリウム（以下、Ｈｅと略す）リーク試験を行うことでＨｅ原子の漏れ量を測定し、封口板の気密性を評価した。Ｈｅリーク試験とは、封口板で電池を封口したときに外側に面する金属ケース６と内側に面する金属ケースをフッ素ゴムで挟み、電池を封口したときに外側に面するほうを吸引し、内側に面するほうから０．２ＭＰａのＨｅガスを印加し、外側に漏れてくるＨｅガス量を検知器で測定する試験方法である。 In addition, helium (hereinafter abbreviated as “He”) leak tests were performed three by three in each case to measure the amount of He atom leakage, and the sealing plate was evaluated for hermeticity. The He leak test means that the metal case 6 facing outside when the battery is sealed with a sealing plate and the metal case facing inside are sandwiched with fluoro rubber, and the one facing the outside when the battery is sealed is sucked, In this test method, 0.2 MPa of He gas is applied from the inner side and the amount of He gas leaking to the outside is measured by a detector.
表１に断面から測定した上部金属箔の圧縮率、およびＨｅガスの漏れ量の平均値を示す。表面粗さＲａの値が大きくなるほど、上部金属箔の圧縮率は小さくなり、インナーガスケットの圧縮率は大きくなる。このとき、Ｈｅガスの漏れ量は低下し、気密性がより向上していることを示している。Ｈｅガスの漏れ量が１×１０−６Ｐａ・ｍ３／秒より小さい場合に、十分な気密性が保てる。表面粗さＲａ値０．１μｍより小さい場合、上部金属箔の圧縮率は１００％となり、インナーガスケットの頂点から切れてしまい、Ｈｅガスの漏れ量は１×１０−６Ｐａ・ｍ３／秒より多く気密が保てない。 Table 1 shows the compressibility of the upper metal foil measured from the cross section and the average value of the leak amount of He gas. As the value of the surface roughness Ra increases, the compression ratio of the upper metal foil decreases and the compression ratio of the inner gasket increases. At this time, the leak amount of He gas is reduced, indicating that the airtightness is further improved. When the amount of He gas leakage is smaller than 1 × 10 −6 Pa · m 3 / sec, sufficient airtightness can be maintained. When the surface roughness Ra value is smaller than 0.1 μm, the compression ratio of the upper metal foil is 100%, and it is cut off from the top of the inner gasket, and the amount of He gas leakage is 1 × 10 −6 Pa · m 3 / sec. I can't keep much airtight.
これらのことは、表面粗さＲａ値が大きいほど、また、電解メッキの場合、メッキ材が金属板スペーサの表面を被い、前記金属スペーサの下面と上部金属箔との間の摩擦を増大させる効果がある。そのため、上部金属箔はすべりにくくなり、伸びて切れることなくインナーガスケットのリング状基部を圧縮することができるようになる。これによって、気密を確保することができるようになる。また、電解メッキの場合、無電解メッキよりもＮｉが緻密にメッキされ、表面抵抗を大きくすることができ、前記金属スペーサの下面と上部金属箔との間の摩擦を増大させる表面処理として好ましい。また、Ａｕ、Ａｇ、Ｓｎメッキの場合、表面粗さの向上、Ｈｅガスの漏れ量低減にはあまり寄与しない。生産コスト
の観点から、Ｎｉメッキは安価であるため、実使用上Ｎｉメッキが好ましい。
These facts indicate that as the surface roughness Ra value increases, and in the case of electrolytic plating, the plating material covers the surface of the metal plate spacer and increases the friction between the lower surface of the metal spacer and the upper metal foil. effective. Therefore, the upper metal foil is difficult to slip, and the ring-shaped base portion of the inner gasket can be compressed without stretching and breaking. As a result, airtightness can be secured. Further, in the case of electrolytic plating, Ni is plated more densely than electroless plating, and the surface resistance can be increased, which is preferable as a surface treatment for increasing the friction between the lower surface of the metal spacer and the upper metal foil. In the case of Au, Ag, or Sn plating, it does not contribute much to improving the surface roughness and reducing the amount of He gas leakage. From the viewpoint of production cost, since Ni plating is inexpensive, Ni plating is preferable for practical use.
以下に、上部金属箔について説明する。 The upper metal foil will be described below.
《実施例９〜１３》
上部金属箔１は、以下に説明する表２に示したように引張強度を変えたものを使用した。
引張強度が３０Ｎ／ｍｍ２のＡ１Ｎ９０−Ｏ材で厚み０．０７５ｍｍ（実施例９）、引張強度が４０Ｎ／ｍｍ２のＡ１Ｎ９０−Ｏ材で厚み０．０８ｍｍ（実施例１０）、引張強度が５０Ｎ／ｍｍ２のＡ１Ｎ３０−Ｏ材で厚み０．０７ｍｍ（実施例１１）、引張強度が５５Ｎ／ｍｍ２のＡ１Ｎ３０−Ｏ材で厚み０．０７５ｍｍ（実施例１２）、引張強度が８０Ｎ／ｍｍ２のＡ１Ｎ３０−Ｏ材で厚み０．０８ｍｍ（実施例１３）のアルミニウムを使用した。また、金属板スペーサ４には、実施例１と同様に表面粗さＲａ値は２．２μｍで電解Ｎｉメッキのものを使用した。
<< Examples 9 to 13 >>
As the upper metal foil 1, one having a changed tensile strength as shown in Table 2 described below was used.
A1N90-O material having a tensile strength of 30 N / mm 2 and a thickness of 0.075 mm (Example 9), A1N90-O material having a tensile strength of 40 N / mm 2 and a thickness of 0.08 mm (Example 10), and a tensile strength of 50 N / thickness in A1N30-O material mm 2 0.07 mm (example 11), the thickness tensile strength at A1N30-O material 55N / mm 2 0.075 mm (example 12), tensile strength of 80 N / mm 2 Aluminum having an A1N30-O material thickness of 0.08 mm (Example 13) was used. Further, as the metal plate spacer 4, a surface roughness Ra value of 2.2 μm and electrolytic Ni plating was used as in Example 1.
この上部金属箔１を使用し封口板を組み立てた。封口板の上下を金属ケース６の孔の下の位置に穴を設けたウレタンゴムで挟み、金属ケース６の孔から圧力を負荷し、封口板単体の電流遮断圧を測定した。電流遮断圧の測定は各々１０個行った。 A sealing plate was assembled using the upper metal foil 1. The upper and lower sides of the sealing plate were sandwiched by urethane rubber having a hole below the hole of the metal case 6, pressure was applied from the hole of the metal case 6, and the current cutoff pressure of the sealing plate alone was measured. Ten current interruption pressures were measured.
表２に測定した電流遮断圧の平均値を示す。上部金属箔の引張強度が大きくなるほど電流遮断圧が高くなる。電池の実使用上、１ＭＰａ以下で電流を遮断することによって、電池内圧の上昇を未然に止めることが好ましい。電流遮断圧の設定は、実使用上０．７ＭＰａ付近に設定すると、確実に１ＭＰａ以下で電流遮断機構を作動することができる。よって、引張強度５０Ｎ／ｍｍ２以下の材料が好ましい。 Table 2 shows the average value of the current interruption pressure measured. The higher the tensile strength of the upper metal foil, the higher the current breaking pressure. For practical use of the battery, it is preferable to stop the increase in battery internal pressure by cutting off the current at 1 MPa or less. If the current interruption pressure is set to about 0.7 MPa in actual use, the current interruption mechanism can be reliably operated at 1 MPa or less. Therefore, a material having a tensile strength of 50 N / mm 2 or less is preferable.
電池内圧上昇時において、所定の圧力で安全機構を確実に作動させることができる封口板を得ることができ、この封口板を用いた密閉型電池は、安全性が高く、気密性が高い密閉型電池を提供することができ、ノートパソコン、携帯電話、デジタルスチルカメラなどの小型携帯機器等の駆動用電源として有用である。 When the internal pressure of the battery rises, a sealing plate that can reliably operate the safety mechanism at a predetermined pressure can be obtained. A sealed battery using this sealing plate is highly safe and hermetic. A battery can be provided and is useful as a driving power source for small portable devices such as notebook computers, mobile phones, and digital still cameras.
１ 上部金属箔
２ 下部金属箔
３ インナーガスケット
４ 金属板スペーサ
５ 金属キャップ
６ 金属ケース
DESCRIPTION OF SYMBOLS 1 Upper metal foil 2 Lower metal foil 3 Inner gasket 4 Metal plate spacer 5 Metal cap 6 Metal case
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| JP2005108369A JP2006286561A (en) | 2005-04-05 | 2005-04-05 | Sealing plate for sealed battery |
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| JP2005108369A JP2006286561A (en) | 2005-04-05 | 2005-04-05 | Sealing plate for sealed battery |
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| JP2006286561A true JP2006286561A (en) | 2006-10-19 |
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| WO2008106835A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd | An improved battery mouth-sealing assembly and a battery including the same |
| WO2008106834A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd | An improved battery mouth-sealing assembly and a battery including the same |
| WO2008106836A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd , | Battery mouth-sealing assembly and battery including the same |
| US20100021812A1 (en) * | 2006-12-11 | 2010-01-28 | Lg Chem, Ltd. | Lithium ion battery of crimping shape of increased safety |
| US20100159288A1 (en) * | 2008-12-18 | 2010-06-24 | Samsung Sdi Co., Ltd. | Cap assembly and secondary battery having the same |
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| WO2011040692A1 (en) | 2009-09-30 | 2011-04-07 | 주식회사 엘지화학 | Double-sealed cap assembly and cylindrical secondary battery comprising same |
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| US7824790B2 (en) | 2004-04-28 | 2010-11-02 | Eveready Battery Co., Inc. | Housing for a sealed electrochemical battery cell |
| US8173284B2 (en) | 2004-04-28 | 2012-05-08 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical cell |
| US7923138B2 (en) | 2004-04-28 | 2011-04-12 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical battery cell |
| US7833647B2 (en) | 2004-04-28 | 2010-11-16 | Eveready Battery Company, Inc. | Closure vent seal and assembly |
| US9130203B2 (en) * | 2006-12-11 | 2015-09-08 | Lg Chem, Ltd. | Lithium ion battery of crimping shape of increased safety |
| US20100021812A1 (en) * | 2006-12-11 | 2010-01-28 | Lg Chem, Ltd. | Lithium ion battery of crimping shape of increased safety |
| US8889288B2 (en) | 2006-12-11 | 2014-11-18 | Lg Chem, Ltd. | Lithium ion battery of crimping shape of increased safety |
| WO2008106834A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd | An improved battery mouth-sealing assembly and a battery including the same |
| JP2010520590A (en) * | 2007-03-02 | 2010-06-10 | シェンチェン バク バッテリー カンパニー リミテッド | Battery seal assembly and battery |
| WO2008106836A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd , | Battery mouth-sealing assembly and battery including the same |
| WO2008106835A1 (en) * | 2007-03-02 | 2008-09-12 | Shenzhen Bak Battery Co., Ltd | An improved battery mouth-sealing assembly and a battery including the same |
| US8962167B2 (en) | 2007-08-27 | 2015-02-24 | Samsung Sdi Co., Ltd. | Secondary battery having an insulator with protrusions |
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| US8486546B2 (en) | 2008-12-01 | 2013-07-16 | Samsung Sdi Co., Ltd. | Cap assembly and secondary battery using the same with notched vent member |
| US8535828B2 (en) | 2008-12-08 | 2013-09-17 | Samsung Sdi Co., Ltd. | Rechargeable battery |
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