JP2005123060A - Manufacturing method of sealed battery - Google Patents
Manufacturing method of sealed battery Download PDFInfo
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- JP2005123060A JP2005123060A JP2003357721A JP2003357721A JP2005123060A JP 2005123060 A JP2005123060 A JP 2005123060A JP 2003357721 A JP2003357721 A JP 2003357721A JP 2003357721 A JP2003357721 A JP 2003357721A JP 2005123060 A JP2005123060 A JP 2005123060A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000007789 sealing Methods 0.000 claims abstract description 60
- 229910000679 solder Inorganic materials 0.000 claims abstract description 29
- 239000006071 cream Substances 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 239000012528 membrane Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010248 power generation Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 18
- 230000006866 deterioration Effects 0.000 abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 238000010309 melting process Methods 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000003860 storage Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011255 nonaqueous electrolyte Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 235000012489 doughnuts Nutrition 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
本発明は、発電要素を収容した電池ケースの開口部を閉塞すると共に、内部にＰＴＣ素子が配置された封口板を備えた密閉型電池に関し、封口板の耐漏液性を向上させると共に、その製造工程を簡素化した密閉型電池の製造法に関する。 The present invention relates to a sealed battery including a sealing plate having a sealing plate in which a PTC element is disposed while closing an opening of a battery case containing a power generation element, and improving the leakage resistance of the sealing plate and manufacturing the same. The present invention relates to a method for manufacturing a sealed battery with simplified processes.
密閉型電池は、携帯機器の電源をはじめとする幅広い分野で使用されている。特に、リチウム、若しくはその合金からなる負極、非水電解液を用いた密閉型電池（以下、単に密閉型電池とする）は、長期間の保存、使用に対する電池特性の劣化が極めて小さく、且つ使用可能な温度範囲が広いことから、前記携帯機器の電源だけでなく、ガスメータ、車載用緊急通報システムの電源といった高い信頼性が要求される分野では必要不可欠な電池である。 Sealed batteries are used in a wide range of fields including power supplies for portable devices. In particular, a sealed battery (hereinafter simply referred to as a sealed battery) using a negative electrode made of lithium or an alloy thereof or a non-aqueous electrolyte (hereinafter simply referred to as a sealed battery) has a very small deterioration in battery characteristics for long-term storage and use. Since the possible temperature range is wide, it is an indispensable battery not only in the power source of the portable device but also in fields requiring high reliability such as a power source of a gas meter and an in-vehicle emergency call system.
密閉型電池は、上述のように高いエネルギー密度を有しており、電池の異状放電、短絡等に起因する安全性の低下を回避するために、ＰＴＣ素子、及び防爆機能を封口板に付加している。この種の封口板は、一方の極板に電気的に接続された皿板上に、安全弁膜、ＰＴＣ素子及びキャップ状の端子板を載置した形態としている。 The sealed battery has a high energy density as described above, and a PTC element and an explosion-proof function are added to the sealing plate in order to avoid a decrease in safety due to abnormal discharge or short circuit of the battery. ing. This type of sealing plate is configured such that a safety valve membrane, a PTC element, and a cap-shaped terminal plate are placed on a plate electrically connected to one electrode plate.
封口板は、その製造工程で安全弁膜、ＰＴＣ素子、キャップ状端子板が載置された皿板をシーマ等によりカシメを行うことで一体化している。しかし、カシメ工程は、皿板に偏心等の不良を起こし易く、また生産性の低下を招いてしまう。そして、カシメ状態の不良は、保存時、特に上記用途で想定される高温環境下での保存（以下、単に「高温保存時」とする）の際において耐漏液性を低下させる主因となっていた。 The sealing plate is integrated by caulking the plate with the safety valve membrane, the PTC element, and the cap-shaped terminal plate placed thereon with a seamer or the like in the manufacturing process. However, the caulking process tends to cause defects such as eccentricity in the dish plate, and causes a decrease in productivity. In addition, the poor caulking state has been a major cause of reducing leakage resistance during storage, particularly during storage in a high-temperature environment assumed for the above-mentioned use (hereinafter simply referred to as “high-temperature storage”). .
そこで本発明者らは、未公開自社出願の特願２００２−２１２０３３号において、先にキャップ状端子板、ＰＴＣ素子、安全弁膜、及び皿板の要素が隣接する他の要素に対して溶着、或いは溶接にて一体化すること、且つ溶接、溶着が施された部位を液密とすることを提案した。 Therefore, the present inventors, in Japanese Patent Application No. 2002-212033 of the unpublished in-house application, previously welded the cap-shaped terminal plate, PTC element, safety valve membrane, and other elements adjacent to the plate, or It has been proposed to integrate by welding, and to make the part subjected to welding and welding liquid-tight.
しかし、この提案による封口板は、各要素を溶着、或いは溶接にて一体化する工程が新たに生じてしまう。このため、カシメのみとした従来の封口板に比較して生産工程の煩雑化を招いてしまい、製造コストの上昇に繋がってしまう。 However, the sealing plate according to this proposal newly creates a process of integrating the elements by welding or welding. For this reason, compared with the conventional sealing board made only with crimping, complication of a production process is caused and it leads to an increase in manufacturing cost.
本発明の目的は、上述のような封口板、すなわち積層面を介した漏液の発生を防止するために溶接、或いは溶着にて一体化された封口板を、効率よく製造するものであり、同時に高い信頼性と、電池特性の劣化も抑制した密閉型電池を提供する製造法を提案することにある。 The purpose of the present invention is to efficiently manufacture a sealing plate as described above, that is, a sealing plate integrated by welding or welding in order to prevent the occurrence of liquid leakage through the laminated surface, At the same time, it is to propose a manufacturing method that provides a sealed battery with high reliability and suppressed deterioration of battery characteristics.
上記目的を達成するために、本発明に係る製造法は、有底筒状の電池ケースを封口板で閉塞した密閉型電池の製造法であり、前記封口板は、ガス抜き孔を設けたキャップ状端子板、このキャップ状端子板の下側に配置され、ガス抜き孔を設けたＰＴＣ素子、発電要素の一方の電極に接続され、ガス抜き孔を有する皿板、前記ガス抜き孔を閉塞し、電池の内圧上昇時に膨脹、破断する機能を有し、前記皿板とＰＴＣ素子との間に配される安全弁膜を要素としており、前記各要素と隣接する要素との少なくとも一方の接合面にクリームハ
ンダを塗布する工程、上方よりキャップ状端子板、ＰＴＣ素子、安全弁膜、及び皿板の順になるように各要素が載置され、封口板の半完成体である組立封口板を作製する工程、前記クリームハンダを溶融させ、各要素の接合面を一体化し、積層面を液密とする工程を有することを特徴とするものである。
In order to achieve the above object, a manufacturing method according to the present invention is a manufacturing method of a sealed battery in which a bottomed cylindrical battery case is closed with a sealing plate, and the sealing plate is a cap provided with a gas vent hole. A terminal plate, a PTC element disposed on the lower side of the cap-shaped terminal plate, provided with a gas vent hole, connected to one electrode of the power generation element, and a plate plate having a gas vent hole, closing the gas vent hole And having a function of expanding and breaking when the internal pressure of the battery is increased, and having a safety valve membrane disposed between the plate and the PTC element as an element, and at least one joint surface between each element and an adjacent element A step of applying cream solder, a step of producing an assembly sealing plate that is a semi-finished sealing plate by placing each element in the order of a cap-shaped terminal plate, a PTC element, a safety valve membrane, and a dish plate from above , Melt the cream solder, Integrated bonding surface of the element, is characterized in that it has a step of a stacking surface and liquid-tight.
本発明の製造法にて作製される電池は、皿板上に載置された安全弁膜、ＰＴＣ素子、キャップ状端子板の各積層面、すなわち隣接する要素との接触面は、クリームハンダの塗布し、そして溶融させる工程を経ることにより溶着部位を形成している。これらの部位は、積層面全体を溶着部位とすること、或いは接触面の全周にわたる溶着部位、例えば少なくとも一畝の連続した溶着部位とすることで、各要素を接合し、一体化すると同時に積層面を液密としている。これにより、封口板を構成する要素は電気的に接続されているだけでなく、液密性が付与されることで、積層面間への電解液の侵入を阻止し、封口板を介した漏液の発生を確実に抑制するものである。そして、本発明の製造法は、各構成要素が組み合わされた状態の組立封口板を作製した後、クリームハンダを溶融させることで各要素を同時に一体化している。このため、要素毎に溶接（溶着）を実施し、接合する製造法（非特許文献１にて提案）に比較して、工数の大幅な減少が実現される。 The battery manufactured by the manufacturing method of the present invention is applied to the laminated surface of the safety valve film, the PTC element, and the cap-shaped terminal plate placed on the plate, that is, the contact surface with the adjacent element is coated with cream solder. And the welding part is formed by passing through the process of melting. These parts can be laminated at the same time as joining and integrating each element by making the entire lamination surface a welding site, or by making a welding site all around the contact surface, for example, at least one continuous welding site. The surface is liquid-tight. As a result, not only the elements constituting the sealing plate are electrically connected, but also liquid-tightness is imparted, thereby preventing the electrolyte from entering between the laminated surfaces and causing leakage through the sealing plate. The generation of liquid is surely suppressed. And in the manufacturing method of this invention, after producing the assembly sealing board of the state in which each component was combined, each element was integrated simultaneously by melting cream solder. For this reason, compared with the manufacturing method (suggested in Non-Patent Document 1) in which welding (welding) is performed for each element and joined, the man-hours are significantly reduced.
また、本発明の製造法では、各要素の接合にクリームハンダを用いるのが好ましい。クリームハンダは、ハンダ粉末に比べて積層面に均一な塗布が可能であり、塗布量及び塗布位置の精度確保も容易である。また、クリームハンダは、積層面で対向する要素の両方に塗布する方法でも、片方に塗布する方法の何れであっても良く、各要素の接合強度と液密性を確保するに必要十分な量であるのが好ましい。 Moreover, in the manufacturing method of this invention, it is preferable to use cream solder for joining of each element. Cream solder can be applied uniformly on the laminated surface as compared with solder powder, and it is easy to ensure the accuracy of application amount and application position. Further, the cream solder may be applied to both of the elements facing each other on the laminated surface or applied to one side, and the amount necessary and sufficient for ensuring the bonding strength and liquid tightness of each element. Is preferred.
積層面に塗布されるハンダの量が多い場合、各要素の積層面からハンダがはみ出す虞があり、封口板の組立精度の悪化に繋がってしまう。特に、安全弁膜の周縁でハンダのはみ出しが生じた場合、ハンダを介して皿板とＰＴＣ素子が電気的に接続された状態となり、安全弁膜が破断しているも拘わらず、電流遮断がなされない状態となってしまう。一方、ハンダの塗布量が少ない場合、或いは均一な塗布がなされない場合には、積層面の液密性を低下させることになる。特に、クリームハンダの塗布量に偏りがあった場合には、各要素の配置位置が平行にならず、組立精度の悪化にも繋がってしまう、以上のことから、積層面におけるハンダは、非常に高い塗布精度が要求されることがわかる。 When the amount of solder applied to the laminated surface is large, the solder may protrude from the laminated surface of each element, leading to deterioration in the assembly accuracy of the sealing plate. In particular, when solder protrudes at the periphery of the safety valve membrane, the plate and the PTC element are electrically connected via the solder, and the current is not cut off even though the safety valve membrane is broken. It becomes a state. On the other hand, when the amount of solder applied is small or when uniform coating is not performed, the liquid tightness of the laminated surface is lowered. In particular, when there is a bias in the amount of cream solder applied, the arrangement position of each element does not become parallel, leading to deterioration in assembly accuracy. It can be seen that high application accuracy is required.
クリームハンダを溶融させる工程は、クリームハンダが塗布された組立封口板を、電気炉や高周波炉等に挿入すると共に、組立封口板を加圧し、各要素の相対位置を保持しながら、クリームハンダを溶融させることで各要素の一体化を実施するものである。 In the process of melting the cream solder, the assembly sealing plate coated with the cream solder is inserted into an electric furnace, a high-frequency furnace or the like, and the assembly sealing plate is pressurized to maintain the relative position of each element, The elements are integrated by melting.
一方、従来の封口板、すなわち構成要素の一体化がなされていない封口板の組立工程と比較すると、クリームハンダを塗布する工程、及び塗布されたクリームハンダを溶融させる工程が増加している。しかし、工数の増加が最少に抑えられており、生産の顕著な悪化を招くものではない。さらに、作製された封口板は、クリームハンダによる溶着部位が各要素の積層面間に形成されることで、要素間の接触抵抗が減少しており、従来構成の封口板に比して放電特性を改善する効果も奏する。以上の説明から明確なように、本発明に係る製造法は、従来の封口板の製造法に比べて工数の増加は生じるものの特性面の向上が実現でき、溶接（溶着）による一体化を採用した製造法に比べて工数の減少を実現するものである。 On the other hand, as compared with the conventional sealing plate, that is, a process for assembling a sealing plate in which components are not integrated, the number of steps for applying cream solder and the step for melting the applied cream solder are increasing. However, the increase in the number of man-hours is minimized, and it does not cause a significant deterioration in production. Furthermore, the sealing plate produced has a reduced contact resistance between elements due to the formation of the solder solder welds between the laminated surfaces of each element, and discharge characteristics compared to the conventional sealing plate. It also has the effect of improving As is clear from the above explanation, the manufacturing method according to the present invention can improve the characteristic aspect although the man-hour is increased as compared with the conventional manufacturing method of the sealing plate, and adopts integration by welding (welding). The man-hours can be reduced compared with the manufacturing method.
さらに、本発明に係る製造法は、ＰＴＣ素子の熱処理工程を要素の一体化を実施する溶着工程後に行うことで、更なる工程の簡素化を実現するものである。この熱処理工程に関し、より深い理解を供するために、封口板の作製工程を示すフローチャートの図２を用いて本発明、及び従来例における製造法を比較する。同図（ａ）は、従来の製造法を示すフ
ローチャートである。この製造法は、従来の技術の項で既説の通り、封口板を構成する要素を載置し、重ね合わせた後に、皿板の周縁部を内方に屈曲させるカシメにて封口板を作製している。ＰＴＣ素子は、予め所定形状であるドーナツ型に打ち抜き加工を施した後、熱処理を施している。この熱処理は、ＰＴＣ素子を低抵抗化するものである。同時に、フィルタ及びＡｌ弁体はカシメ工程に先立ち、予め溶着を施すことで一体化し、電気的接続を行っている。一方、従来構造のカシメ工程に代えて溶着工程を採用した同図（ｂ）に示す製造法では、上記従来の製造法と同様に、クリームハンダが積層面に塗布された各要素を重ね合わせた後、溶着を実施している。この製造法では、溶着に伴う熱によりＰＴＣ素子の特性への影響が懸念される。そこで、溶着工程を実施した後、ＰＴＣ素子への熱影響の排除を目的として、ＰＴＣ素子に再度の熱処理を施し、低抵抗化を実施する必要がある。
Furthermore, the manufacturing method which concerns on this invention implement | achieves the simplification of the further process by performing the heat processing process of a PTC element after the welding process which implements integration of an element. In order to provide a deeper understanding regarding this heat treatment step, the manufacturing method in the present invention and the conventional example will be compared using FIG. 2 of the flowchart showing the sealing plate manufacturing step. FIG. 1A is a flowchart showing a conventional manufacturing method. In this manufacturing method, as already described in the section of the prior art, after the elements constituting the sealing plate are placed and overlapped, the sealing plate is produced by caulking the peripheral portion of the dish plate inwardly. doing. The PTC element is subjected to heat treatment after punching a donut shape having a predetermined shape in advance. This heat treatment reduces the resistance of the PTC element. At the same time, the filter and the Al valve body are integrated and electrically connected by pre-welding prior to the caulking process. On the other hand, in the manufacturing method shown in FIG. 5B in which a welding process is adopted instead of the caulking process of the conventional structure, each element on which the cream solder is applied on the laminated surface is overlapped as in the conventional manufacturing method. After that, welding is carried out. In this manufacturing method, there is a concern about the influence on the characteristics of the PTC element due to heat accompanying welding. Therefore, after performing the welding process, it is necessary to reduce the resistance by subjecting the PTC element to another heat treatment for the purpose of eliminating the thermal effect on the PTC element.
これらに対して、同図（ｃ）に示す本発明の製造法は、所定形状に打ち抜き加工されたＰＴＣ素子、別体にあるフィルタとＡｌ弁体、及びキャップの積層面にクリームハンダを塗布した後、これらを重ね合わせ、リフロー法等による溶着工程を実施している。この製造法によれば、封口板の組立工程に先立つ前処理の工程、すなわちＰＴＣ素子の熱処理、Ａｌ弁体の作製が不要となり、製造工程の簡素化に繋がるものである。 On the other hand, in the manufacturing method of the present invention shown in FIG. 5C, cream solder is applied to the laminated surface of the PTC element punched into a predetermined shape, a separate filter and Al valve body, and a cap. Thereafter, these are superposed and a welding process by a reflow method or the like is performed. According to this manufacturing method, the pre-processing step prior to the sealing plate assembling step, that is, the heat treatment of the PTC element and the production of the Al valve body are not required, leading to simplification of the manufacturing step.
以上のように、本発明による製造法で作製された封口板は、電池の耐漏液性を向上させており、電池特性の劣化を抑制するものである。さらに本発明の製造法は、前記溶着一体化された封口板を、効率よく製造するものであり、その工業的価値は大なるものである。 As described above, the sealing plate produced by the production method according to the present invention improves the liquid leakage resistance of the battery and suppresses the deterioration of the battery characteristics. Furthermore, the manufacturing method of this invention manufactures the said sealing integrated sealing board efficiently, The industrial value becomes large.
以下、本願発明の実施形態を説明する。この実施形態は、本発明の封口板を具現化した一例を示したものであり、以下の記載内容に限定するものではない。 Hereinafter, embodiments of the present invention will be described. This embodiment shows an example which embodies the sealing plate of the present invention, and is not limited to the following description.
本実施形態に係る密閉型電池の封口板は、中央部に凸部を有し、上面または側面部にガス抜き孔を設けたキャップ状端子板、このキャップ状端子板の下側に配置され、中央部にガス抜き孔を設けたＰＴＣ素子、前記発電要素の一方の電極に接続され、中央部にガス抜き孔を有する皿板、この皿板のガス抜き孔を閉塞し、電池の内圧上昇時に膨脹、破断する機能を有し、前記皿板とＰＴＣ素子との間に配される金属製の安全弁膜を備える。 The sealing plate of the sealed battery according to the present embodiment is a cap-shaped terminal plate having a convex portion at the center portion and provided with a gas venting hole on the upper surface or side surface portion, and is disposed below the cap-shaped terminal plate A PTC element having a vent hole in the center, a dish plate connected to one electrode of the power generation element and having a vent hole in the center, and closing the vent hole in the dish plate, when the internal pressure of the battery rises It has a function of expanding and breaking, and includes a metal safety valve membrane disposed between the plate and the PTC element.
皿板は、シート状の鋼板をプレス加工することで所定形状に打ち抜き、中央部に円形或いは方形状のガス抜き孔を打ち抜くことで作製される。さらにプレス加工を施し、中央部を電池ケース側に突出させ、平坦面を形成した形状としても良い。皿板の外周形状は、電池ケースの封口部形状に応じて設定され、厚み方向の形状は封口部位の形状等の種々因子を考慮し、決定される。皿板の下面は、電池ケースの開口部に配置される際に、ケースに収容された正負極板の何れか一方から延出された接続リードを接続する。この時、前記平坦面を形成した皿板では、前記平坦面と皿板の上部に配置される安全弁膜との間に間隙が存在し、接続リードを溶接する際の安全弁膜への熱影響、応力付加の影響を回避できる。 The dish plate is manufactured by punching a sheet-shaped steel plate into a predetermined shape by pressing and punching a circular or square gas vent hole in the center. Furthermore, it is good also as a shape which gave press work and protruded the center part to the battery case side, and formed the flat surface. The outer peripheral shape of the plate is set according to the shape of the sealing part of the battery case, and the shape in the thickness direction is determined in consideration of various factors such as the shape of the sealing part. When the lower surface of the dish plate is disposed in the opening of the battery case, the connection lead extending from one of the positive and negative electrode plates accommodated in the case is connected. At this time, in the dish plate formed with the flat surface, there is a gap between the flat surface and the safety valve film disposed on the upper part of the dish plate, the thermal effect on the safety valve film when welding the connection lead, The effect of applying stress can be avoided.
安全弁膜は、金属薄板、好ましくはアルミニウム箔からなり、電池の内圧上昇にともなって、上方に膨れる。この時、キャップ状端子板の内頂部に切刃を設けた構成では、切刃によって安全膜が破断され、未設置の構成では、安全弁膜の破断強度を調整することで、電池内圧が所定値以上に上昇しない。また、ＰＴＣ素子は、上述した皿板と同様に封口部の形状に応じた外周形状に打ち抜かれ、中央部に円形或いは方形状のガス抜き孔を形成し、ドーナツ状とされる。ＰＴＣ素子は導電性高分子材料の表裏面に金属薄板を一体化した構造を有しており、封口板の他の要素に対して溶着、及び溶接による接続が可能である。 The safety valve membrane is made of a thin metal plate, preferably aluminum foil, and swells upward as the internal pressure of the battery increases. At this time, in the configuration in which the cutting blade is provided on the inner top portion of the cap-shaped terminal plate, the safety membrane is broken by the cutting blade, and in the configuration in which the cutting blade is not installed, the internal pressure of the battery is set to a predetermined value by adjusting the breaking strength of the safety valve membrane. It will not rise any more. In addition, the PTC element is punched into an outer peripheral shape corresponding to the shape of the sealing portion in the same manner as the above-described dish plate, and a circular or rectangular gas vent hole is formed in the central portion to form a donut shape. The PTC element has a structure in which a thin metal plate is integrated on the front and back surfaces of a conductive polymer material, and can be connected to other elements of the sealing plate by welding and welding.
キャップ状端子板は、中央部に凸部を有し、上面または側面部にガス抜き孔を設けた形態である。この端子板は、ステンレス鋼板等をプレス加工にて所定の外観形状に打ち抜いた後、さらに中央部を突出させるようにプレス加工を施している。凸部は、封口板の様態に完成した際に、皿板及びＰＴＣ素子の中央部に形成したガス抜き孔と連通する様に形状を規定している。また、安全弁膜を切刃にて破断させる構成を採用した場合には、凸部の頂面の一部を、先端が鋭利な形状で折り曲げることで切刃が形成される。 A cap-shaped terminal board has a convex part in the center part, and is a form which provided the vent hole in the upper surface or the side part. This terminal board is subjected to press work so that a central portion protrudes after a stainless steel plate or the like is punched into a predetermined external shape by press work. The convex portion defines the shape so as to communicate with the vent hole formed in the central portion of the dish plate and the PTC element when completed in the form of a sealing plate. Moreover, when the structure which fractures | ruptures a safety valve membrane with a cutting blade is employ | adopted, a cutting blade is formed by bend | folding a part of top surface of a convex part in the shape where the front-end | tip is sharp.
上述の様に形成された封口板の各要素は、クリームハンダを積層面に塗布した状態で、皿板上に安全弁膜、ＰＴＣ素子及びキャップ状端子板を積層し、加熱及び加圧を施すことによって一体化がなされるものである。 Each element of the sealing plate formed as described above is a state in which cream solder is applied to the lamination surface, and a safety valve membrane, a PTC element and a cap-like terminal plate are laminated on the plate, and heating and pressurization are performed. Is integrated.
作製された本実施形態に係る封口板は、積層面に液密性を有する。このため、封口板への電解液の侵入を阻止し、封口板を介した漏液の発生を確実に抑制することで、高温保存時などにおける電池の耐漏液性を大幅に向上させることができる。 The produced sealing plate according to the present embodiment has liquid tightness on the laminated surface. For this reason, the leakage resistance of the battery during high-temperature storage can be greatly improved by preventing the electrolyte from entering the sealing plate and reliably suppressing the occurrence of leakage through the sealing plate. .
以下、本発明の実施例について図面を参照しながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は、本発明に係る密閉型電池の部分断面図である。本発明に係る電池の主たる要素である封口板（番号は付与せず）は、皿板７、安全弁膜６、ＰＴＣ素子４、キャップ状端子板１の順で載置された構成を有しており、有底筒状の電池ケース１０の上端に配されている。図１から明らかなように、封口板はガスケット８を介して電池ケース１０の開口部にカシメ固定されており、電池ケース１０を封口する。また、電池ケース１０に収容された発電要素の一方極の極板に接続される。本実施例では、正極板に接続されたリード板９は、皿板７の底面に溶接されている。キャップ状端子板１はガス抜き孔２を有している。本実施例では、このガス抜き孔２はキャップ状端子板１の凸部３の上面から側面にかけた部位に形成されたものを用いた。
FIG. 1 is a partial cross-sectional view of a sealed battery according to the present invention. The sealing plate (not numbered) which is the main element of the battery according to the present invention has a configuration in which the
この封口板は、皿板７、安全弁膜６、ＰＴＣ素子４、キャップ状端子板１の各積層面の全体に、クリームハンダを塗布した後、これを溶融させた状態で、封口板の厚み方向に加圧を施することで得られたものである。得られた封口板は、溶着部位５を介して隣接する要素と接合されており、且つ溶着部位５が積層面の全体に形成されることから、ガスケット８を介して封口板へ達した電解液が積層面に侵入するのを抑制している。
The sealing plate is formed by applying cream solder to the entire laminated surface of the
本実施例では、上記の製造法にて作製された電池に関し、漏液の発生有無から本発明の製造法に基づいて作製された電池の特性向上を検証した。具体的には、上記の構成を有する封口板を使用し、正極に二酸化マンガン、負極に金属リチウムを用いた円筒形の非水電解液電池を作製した（電池Ａ）。また、比較例として、各要素の一体がなされていない従来構成の封口板を用いた非水電解液電池を作製した（電池Ｂ）。尚、作製個数は、各々３００個とした。 In this example, regarding the battery manufactured by the above manufacturing method, the characteristics improvement of the battery manufactured based on the manufacturing method of the present invention was verified from the presence or absence of leakage. Specifically, a cylindrical nonaqueous electrolyte battery using a sealing plate having the above-described configuration and using manganese dioxide for the positive electrode and metallic lithium for the negative electrode was produced (battery A). In addition, as a comparative example, a nonaqueous electrolyte battery using a sealing plate having a conventional configuration in which each element is not integrated was manufactured (battery B). In addition, the production number was 300 each.
作製された電池の耐漏液性を検討するために、高温環境下における保存試験を実施した。試験条件は、８５℃の高温環境下に１ヶ月間とし、保存後における漏液の発生有無を顕微鏡による目視検査を行った。その結果を（表１）に示す。 In order to examine the leakage resistance of the fabricated battery, a storage test was conducted in a high temperature environment. The test conditions were one month in a high temperature environment of 85 ° C., and the presence or absence of leakage after storage was visually inspected with a microscope. The results are shown in (Table 1).
（表１）に示したように、高温保存時における耐漏液性が向上しており、本発明に係る製造法は、封口板へ高い信頼性を付与し、電池特性の劣化を抑制するものであることが理解できる。 As shown in (Table 1), the leakage resistance during high-temperature storage is improved, and the production method according to the present invention imparts high reliability to the sealing plate and suppresses deterioration of battery characteristics. I can understand.
１ キャップ状端子板
２ ガス抜き孔
３ 凸部
４ ＰＴＣ素子
５ 溶着部位
６ 安全弁膜
７ 皿板
８ 絶縁パッキング
９ リード板
DESCRIPTION OF SYMBOLS 1 Cap-shaped
Claims (2)
前記封口板は、ガス抜き孔を設けたキャップ状端子板、このキャップ状端子板の下側に配置され、ガス抜き孔を設けたＰＴＣ素子、発電要素の一方の電極に接続され、ガス抜き孔を有する皿板、前記ガス抜き孔を閉塞し、電池の内圧上昇時に膨脹、破断する機能を有し、前記皿板とＰＴＣ素子との間に配される安全弁膜を要素とし、
前記各要素と隣接する要素との少なくとも一方の接合面にクリームハンダを塗布する工程、上方よりキャップ状端子板、ＰＴＣ素子、安全弁膜、及び皿板の順になるように各要素を載置し、組立封口板を作製する工程、前記クリームハンダを溶融させ、各要素の接合面を一体化する工程を有する密閉型電池の製造法。 A method of manufacturing a sealed battery in which a bottomed cylindrical battery case is closed with a sealing plate,
The sealing plate is a cap-shaped terminal plate provided with a gas vent hole, disposed under the cap-shaped terminal plate, connected to one electrode of the PTC element provided with the gas vent hole and the power generation element, and has a gas vent hole. Having a function of closing the gas vent hole, expanding and breaking when the internal pressure of the battery is increased, and having a safety valve membrane disposed between the dish plate and the PTC element as an element,
The step of applying cream solder to at least one joint surface between each element and the adjacent element, placing each element in the order of the cap-shaped terminal plate, PTC element, safety valve membrane, and dish plate from above, A method for producing a sealed battery, comprising a step of producing an assembly sealing plate, a step of melting the cream solder, and integrating the joint surfaces of the elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003357721A JP2005123060A (en) | 2003-10-17 | 2003-10-17 | Manufacturing method of sealed battery |
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|---|---|---|---|
| JP2003357721A JP2005123060A (en) | 2003-10-17 | 2003-10-17 | Manufacturing method of sealed battery |
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| JP2005123060A true JP2005123060A (en) | 2005-05-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1883125A1 (en) * | 2005-05-16 | 2008-01-30 | Tyco Electronics Raychem K.K. | Sealing body and cell pack using the same |
| WO2008145045A1 (en) * | 2007-05-25 | 2008-12-04 | Harbin Coslight Power Co., Ltd | Lithium ion battery explosion proof device |
| US8399125B2 (en) | 2007-11-08 | 2013-03-19 | Samsung Sdi Co., Ltd. | Cap assembly and secondary battery using the same |
| EP3043400A1 (en) * | 2015-01-08 | 2016-07-13 | Samsung SDI Co., Ltd. | Cylindrical lithium ion secondary battery |
| CN106016372A (en) * | 2016-06-15 | 2016-10-12 | 浙江鼎电器有限公司 | Integrated stove with emergency power supply function |
-
2003
- 2003-10-17 JP JP2003357721A patent/JP2005123060A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1883125A1 (en) * | 2005-05-16 | 2008-01-30 | Tyco Electronics Raychem K.K. | Sealing body and cell pack using the same |
| EP1883125A4 (en) * | 2005-05-16 | 2010-07-21 | Tyco Electronics Raychem Kk | Sealing body and cell pack using the same |
| WO2008145045A1 (en) * | 2007-05-25 | 2008-12-04 | Harbin Coslight Power Co., Ltd | Lithium ion battery explosion proof device |
| US8399125B2 (en) | 2007-11-08 | 2013-03-19 | Samsung Sdi Co., Ltd. | Cap assembly and secondary battery using the same |
| EP3043400A1 (en) * | 2015-01-08 | 2016-07-13 | Samsung SDI Co., Ltd. | Cylindrical lithium ion secondary battery |
| KR20160085601A (en) * | 2015-01-08 | 2016-07-18 | 삼성에스디아이 주식회사 | Cylindrical lithium ion secondary battery |
| US9979057B2 (en) | 2015-01-08 | 2018-05-22 | Samsung Sdi Co., Ltd. | Cylindrical lithium ion secondary battery |
| KR102275422B1 (en) | 2015-01-08 | 2021-07-09 | 삼성에스디아이 주식회사 | Cylindrical lithium ion secondary battery |
| CN106016372A (en) * | 2016-06-15 | 2016-10-12 | 浙江鼎电器有限公司 | Integrated stove with emergency power supply function |
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