JP6436479B2 - Sealing method for liquid injection part for lithium ion battery - Google Patents
Sealing method for liquid injection part for lithium ion battery Download PDFInfo
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- JP6436479B2 JP6436479B2 JP2014214463A JP2014214463A JP6436479B2 JP 6436479 B2 JP6436479 B2 JP 6436479B2 JP 2014214463 A JP2014214463 A JP 2014214463A JP 2014214463 A JP2014214463 A JP 2014214463A JP 6436479 B2 JP6436479 B2 JP 6436479B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Description
本発明は、リチウムイオン電池の注液後の開口部を密閉するためのリチウムイオン電池用注液部の密閉方法に関するものである。 The present invention relates to a method for sealing a liquid injection portion for a lithium ion battery for sealing an opening after the injection of the lithium ion battery.
モバイル型ノートパソコンやタブレット型端末、スマートフォン、携帯音楽機器といった昨今のエレクトロニクス製品の高性能化と小型軽量化には、蓄電池の中でも高電位かつ高エネルギー密度を有するリチウムイオン電池(Lithium Ion Battery, 以下LIBと略記)が大きく寄与しており、角形やパウチ型など様々な形態のLIBがこれらの機器に搭載されている。近年、その用途は前記の小〜中型機器以外にも拡がりを見せ、電気自動車やハイブリッド自動車、電車、航空機といった移動体用の電源として、あるいは病院施設や通信基地局などで非常時に備えた定置用電源として、大型LIBの研究開発と製品化が進められている。 In order to improve the performance and size and weight of modern electronic products such as mobile notebook PCs, tablet terminals, smartphones, and portable music devices, lithium-ion batteries (Lithium Ion Battery, below) have high potential and high energy density among storage batteries. (Abbreviated as LIB) greatly contributes, and various types of LIBs such as a square shape and a pouch type are mounted on these devices. In recent years, its use has expanded to other than the above-mentioned small to medium-sized devices, and it can be used as a power source for moving bodies such as electric cars, hybrid cars, trains, and aircraft, or for emergency use in hospital facilities and communication base stations. As a power source, research and development and commercialization of large LIBs are being promoted.
ここで、移動体にしばしば用いられる角形LIBを例にとり、簡単に構成を説明する。角形LIBは、正極と負極を交互にセパレータを介して積層した極板群を電槽缶に格納し、該正極と該負極に夫々設けた集電タブを、電槽蓋に絶縁して設けた極端子に接続し、該電槽蓋を電槽缶に接合することで、電池内部の該極板群から外部へ電気エネルギーを取り出す構造を有する。 Here, the configuration will be briefly described by taking, as an example, a square LIB often used for a moving body. In the rectangular LIB, an electrode plate group in which positive electrodes and negative electrodes are alternately stacked via separators is stored in a battery case, and current collecting tabs provided on the positive electrode and the negative electrode, respectively, are insulated from the battery case lid. By connecting to the electrode terminal and joining the battery case lid to the battery case can, it has a structure for extracting electric energy from the electrode plate group inside the battery to the outside.
更に該電槽蓋に穿設した貫通孔から、電解液を電槽缶内に所定量注液する。電解液は有機溶媒にリチウム塩を溶解した非水系溶液を用いるが、該電解液は大気中の水分との接触によって激しい性能の劣化を引き起こすので、通常、不活性ガス雰囲気下において注液作業を行う。注液後、電解液と大気との接触を遮断するため、該貫通孔を種々の手段により封止密閉して密閉構造と成すことで、注液部の密閉構造を具備したLIBを得る。 Further, a predetermined amount of electrolyte is injected into the battery case through the through-hole formed in the battery case lid. As the electrolyte, a non-aqueous solution in which a lithium salt is dissolved in an organic solvent is used. However, since the electrolyte causes severe performance deterioration due to contact with moisture in the atmosphere, the liquid injection operation is usually performed in an inert gas atmosphere. Do. After injection, in order to cut off the contact between the electrolyte and the atmosphere, the through-hole is sealed and sealed by various means to form a sealed structure, thereby obtaining a LIB having a sealed structure of the injected part.
該注液部の封止密閉方法は、貫通孔に封止栓を嵌合する嵌合工程と、該嵌合箇所を溶接し注液部を密閉する溶接工程に分かれる。特に該溶接工程はLIB電槽缶内に電解液を充填した状態で実施するため、熱による電解液の変質防止を目的として、溶接範囲が狭く熱発生も比較的小さいレーザー溶接を選択することがある。 The sealing and sealing method for the liquid injection part is divided into a fitting process for fitting a sealing plug into the through hole and a welding process for welding the fitting part and sealing the liquid injection part. In particular, since the welding process is performed with the electrolyte solution filled in the LIB battery case, laser welding with a narrow welding range and relatively small heat generation may be selected for the purpose of preventing alteration of the electrolyte solution due to heat. is there.
溶接範囲が狭いことはレーザー溶接の短所でもある。溶接部にコンマ数ミリ程度の空隙があるだけで溶接強度は低下し、場合によっては溶接部にピンホールを生じるなどの溶接不良を起こすことが知られている。LIBの電槽缶にピンホールが生じた場合、気密が著しく低下し、電解液や極板群等の劣化を招くおそれがある。 The narrow welding range is also a disadvantage of laser welding. It is known that the welding strength is lowered only by having a gap of several millimeters in the welded portion, and in some cases, a defective weld such as a pinhole is generated in the welded portion. When pinholes occur in the LIB battery case, the airtightness is remarkably lowered, which may cause deterioration of the electrolyte, the electrode plate group, and the like.
上記の如きレーザー溶接時の溶接不良をなくすため、先に出願人は特許文献1に開示したLIBの電槽缶の密閉方法を提案した。この物は図2に示す通り、電槽蓋1に穿設した貫通孔2に、直径の異なる三段の円筒孔が順に連なった形状の注液孔3を有する中空金属からなる注液栓4を取り付け、以って該貫通孔2と該注液孔3とが連通した状態とし、該注液孔3の下段円筒5の雌ネジ部に対し中段円筒6内に載置した環状パッキン7を介してネジ栓8を螺合し、該ネジ栓頭部9上面と該注液栓4の中段円筒6の内周面が囲繞する所望の深さを有する凹部空間に軟質の平板パッキン10を載置し、更に該平板パッキン10を圧縮するように平板座金11を摺接嵌合し、該平板座金11の外周面と注液栓上段円筒12の内周面とをレーザー溶接にて封止することにより、該電槽蓋1を密閉した。
この方法によれば、平板座金11の位置を上段円筒12の内周に対して自由に決められるため、溶接箇所の空隙を許容範囲内まで小さくできるばかりか、ネジ栓8上の凹部空間に軟質の該平板パッキン10が載置されることで、該平板座金11と注液栓4の上面とを常に面一に保てるため、溶接工程における不良をなくすことができる。
In order to eliminate the welding failure at the time of laser welding as described above, the applicant previously proposed a method for sealing a battery case of LIB disclosed in Patent Document 1. As shown in FIG. 2, this product has a liquid injection plug 4 made of a hollow metal having a liquid injection hole 3 having a shape in which three through-holes of different diameters are successively connected to a through hole 2 formed in the battery case lid 1. Thus, the through-hole 2 and the liquid injection hole 3 are in communication with each other, and an annular packing 7 placed in the middle cylinder 6 with respect to the female thread portion of the lower cylinder 5 of the liquid injection hole 3 is provided. And a soft flat packing 10 is mounted in a recessed space having a desired depth surrounded by the upper surface of the screw plug head 9 and the inner peripheral surface of the middle cylinder 6 of the liquid injection plug 4. The flat plate washer 11 is slidably fitted so as to further compress the flat plate packing 10, and the outer peripheral surface of the flat plate washer 11 and the inner peripheral surface of the liquid injection stopper upper cylinder 12 are sealed by laser welding. As a result, the battery case lid 1 was sealed.
According to this method, since the position of the flat washer 11 can be freely determined with respect to the inner periphery of the upper cylinder 12, not only can the gap of the welded portion be reduced to an allowable range, but also the softness in the recessed space on the screw plug 8 can be reduced. Since the flat plate packing 10 is placed, the flat plate washer 11 and the top surface of the liquid filling tap 4 can always be kept flush with each other, so that defects in the welding process can be eliminated.
他方、レーザー溶接に適した形状の封止栓として、特許文献2は鍔部を設けた多段円筒構造の封止栓を提案している。該鍔部に沿ってレーザー溶接することで、溶接部から注液孔の電解液面までの沿面距離を充分とれるため、溶接熱の電解液への影響を減らし、電解液の漏出やそれに伴うピンホール生成等の溶接不良をなくすことができる。 On the other hand, as a sealing plug having a shape suitable for laser welding, Patent Document 2 proposes a multi-stage cylindrical sealing plug provided with a collar. By performing laser welding along the flange, the creepage distance from the welded portion to the electrolyte surface of the injection hole can be sufficiently increased, so that the influence of welding heat on the electrolyte is reduced, leakage of the electrolyte and the associated pin Welding defects such as hole generation can be eliminated.
然しながら、特許文献1の手法では確かにレーザー溶接不良をなくすことができた一方、加工精度によっては上段円筒12に平板座金11が勘合し辛くなり、その場合はやすりがけが必要となるなど嵌合工程に手間を要し、作業性の向上について改善の余地があった。特に該平板座金11は一度強固に嵌合すると構造上取り外しが困難であり、作業を誤った場合には注液部が破損したり、最悪の場合LIBの電槽自体を損なったりする恐れもあった。更に、部品点数が多いため注液部の構造が複雑となり大型化していた。 However, the technique disclosed in Patent Document 1 can surely eliminate laser welding defects, but depending on the processing accuracy, the flat washer 11 is difficult to fit into the upper cylinder 12, and in that case, fraying is necessary. The process required time and there was room for improvement in terms of workability. In particular, once the flat washer 11 is firmly fitted, it is difficult to remove due to the structure. If the work is mistaken, the liquid injection part may be damaged, or in the worst case, the LIB battery case itself may be damaged. It was. Furthermore, since the number of parts is large, the structure of the liquid injection part has become complicated and large.
一方で、特許文献2の如く鍔部を有する封止栓を用いた場合、該封止栓の寸法公差を大きく取ることが許されるため嵌合工程の作業性は向上するが、必然的に該封止栓と注液孔の嵌合が弱くなるため空隙ができやすく気密性が低下する。気密性が低下すれば、注液孔から溶接部までの沿面距離を稼いでも電解液が容易に浸透するため、溶接熱による該電解液の劣化、最悪の場合には発火や破裂に至る危険も考えられる。逆に寸法公差を小さくした場合、該封止栓を最下部まで嵌合することが難しくなり、よって鍔部が電槽蓋から浮いた状態となり、斯くの如き状態でレーザー溶接を行った際に溶接不良が生じることは予想に難くない。 On the other hand, when a sealing plug having a collar as in Patent Document 2 is used, it is allowed to increase the dimensional tolerance of the sealing plug, so that the workability of the fitting process is improved. Since the fitting between the sealing plug and the liquid injection hole becomes weak, a gap is easily formed, and the airtightness is lowered. If airtightness decreases, the electrolyte easily penetrates even if the creepage distance from the injection hole to the weld is increased.Therefore, there is a risk of deterioration of the electrolyte due to welding heat, and in the worst case, ignition and rupture. Conceivable. On the other hand, when the dimensional tolerance is reduced, it becomes difficult to fit the sealing plug to the lowermost part, so that the collar part floats from the battery case lid, and when laser welding is performed in such a state, It is not difficult to predict that welding defects will occur.
更に上記に加えて解決すべき課題として、一連の密閉工程設備の大型化とそれに伴う製造コストの増大、及び作業性の低下が挙げられる。特許文献2の手法では、注液から密閉封止に至るまでの工程を不活性ガス雰囲気下にて実施する必要があり、注液設備とレーザー溶接装置の両方を一体化させ、諸作業を大型のグローブボックス内にて行う必要があった。更に、注液孔に封止栓を嵌合する作業をグローブボックス内で行うことは困難を要する。不活性ガスが外部に漏れないよう、グローブボックスの作業用手袋は厚手のゴム等で形成される場合が多く、これは寸法が数センチメートル台以下の部品を組み付けるような細かい作業を作業者が行う場合に部品を誤って取り落とし易く、それにより厚さコンマ数ミリの鍔部が破損すれば溶接不良を招く恐れがあり、不便なことこの上ない。 In addition to the above, problems to be solved include an increase in the size of a series of sealing process facilities, an increase in manufacturing costs associated therewith, and a decrease in workability. In the method of Patent Document 2, it is necessary to carry out the process from injection to hermetic sealing in an inert gas atmosphere, and both the injection equipment and the laser welding apparatus are integrated to make various operations large. Had to be done in the glove box. Furthermore, it is difficult to perform the operation of fitting the sealing plug into the liquid injection hole in the glove box. In order to prevent inert gas from leaking to the outside, the gloves for working in the glove box are often made of thick rubber, etc., and this requires the operator to perform detailed work such as assembling parts with dimensions of several centimeters or less. When it is done, it is easy to remove parts by mistake, and there is a risk of inferior welding if the collar part with a thickness of several millimeters is damaged, which is inconvenient.
本願発明は、注液部の気密構造を改善し、従来よりも作業効率がよく、溶接不良をなくし、構造を簡素化かつ小型化し、製造コストを大幅に削減した封口溶接方法を提供することを目的とする。 The invention of the present application provides a sealing welding method that improves the airtight structure of the liquid injection part, has better work efficiency than before, eliminates defective welding, simplifies and downsizes the structure, and significantly reduces manufacturing costs. Objective.
本願発明は、LIBの電槽蓋に穿設した貫通口に、直径の異なる二段の円筒孔が順に連なった形状の注液孔を有する中空金属からなる注液栓を取り付け、以って該貫通孔と該注液孔とが連通した状態とし、該注液栓下部の嵌挿部と該貫通口は気密となるように溶接し、次いで上端外縁に鍔部を設けた封止用ネジ栓を、該注液孔に柔軟性の環状パッキンを介して注液栓内面の雌ネジ部に螺合することで該電槽缶を気密とした状態で、該鍔部と該注液栓の着接箇所を溶接にて封止することを特徴とするLIB用注液部の密閉方法に関するものである。 The invention of the present application attaches a liquid injection plug made of a hollow metal having a liquid injection hole having a shape in which two-stage cylindrical holes of different diameters are successively connected to a through-hole formed in the battery case lid of the LIB. A screw cap for sealing in which the through hole and the liquid injection hole are in communication with each other, the fitting insertion part at the lower part of the liquid injection stopper and the through hole are welded so as to be airtight, and then a flange is provided on the outer edge of the upper end The battery case can be hermetically sealed by screwing into the liquid injection hole through the flexible annular packing into the liquid injection hole, and the battery case can be hermetically sealed. The present invention relates to a method for sealing a liquid injection part for LIB, wherein the contact part is sealed by welding.
本願発明は、注液孔内周に設けたネジ部に対し柔軟性の環状パッキンを介して封止用ネジ栓を螺合することで、該鍔部と注液栓の上面とを着接すれば注液孔を密閉できるため、嵌合し易いように該ネジ栓の寸法公差を大きくしても注液部の気密性を損なわず、作業性を大幅に改善できる。 In the present invention, by screwing a screw cap for sealing through a flexible annular packing to a screw portion provided in the inner periphery of the liquid injection hole, the flange portion and the upper surface of the liquid injection plug are attached. Since the liquid injection hole can be sealed, even if the dimensional tolerance of the screw plug is increased so that it can be easily fitted, the airtightness of the liquid injection part is not impaired and the workability can be greatly improved.
また、LIBは電解液注液後の初充電で電解液が分解し、電解液成分の分解ガスが発生して電槽缶や内部構成物の膨張を起こすが、本願発明は封止用ネジ栓をネジによって外せるため、ガス抜き作業が容易である。一方、特許文献2の如き封止栓を圧入する手法では、このようなガス抜きは困難である。 LIB also decomposes the electrolyte during the initial charge after injecting the electrolyte, generating decomposition gas of the electrolyte component and causing expansion of the battery case and internal components. Since it can be removed with a screw, the degassing work is easy. On the other hand, such degassing is difficult with the technique of press-fitting a sealing plug as in Patent Document 2.
更にこれは、単に該封止用ネジ栓の螺嵌が簡単になることに止まらず、その後の注液部の溶接をグローブボックス外で実施できることを意味する。即ち注液装置とレーザー溶接装置を別体とすることが可能であるので装置を大型化する必要がなく、また汎用の溶接機器を使用できるため製造コストの大幅な削減が可能である。 Furthermore, this means that the screwing of the screw cap for sealing is not simply simplified, and the subsequent welding of the liquid injection part can be performed outside the glove box. That is, since it is possible to separate the liquid injection device and the laser welding device, it is not necessary to increase the size of the device, and since a general-purpose welding device can be used, the manufacturing cost can be greatly reduced.
以下に図面を参照しながら、本願発明の実施の形態について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図1は本願発明の実施形態のLIB用注液部の分解断面図である。金属からなる電槽蓋1の所定の位置に、下方に突出する貫通孔2を穿設している。金属からなる中空の注液栓20は、外径が該貫通孔2の内径と等しく且つ該下方に突出する貫通孔2の高さと同じ長さになるように形成した円筒型の下部嵌挿部21と、該下部嵌挿部21よりも大きな外径の上部円筒部22とが中心線を共有して連なった二段円筒状となるように加工した。更に、中空部分は注液栓20の中心を上下に貫通し、内周面の雌ネジ部を形成した下部円筒孔23と、これより大きな内径を有する上部円筒孔24とが、中心栓を共有して順に連なった二段円筒孔を成すように作製し、これを注液孔25とした。符号30は中央に中空部31を有する円形平坦の環状パッキングで、ポリテトラフルオロエチレン(PTFE)で形成され、柔軟性を有するものである。 FIG. 1 is an exploded cross-sectional view of a LIB injection part according to an embodiment of the present invention. A through-hole 2 projecting downward is formed at a predetermined position of the battery case lid 1 made of metal. A hollow injection plug 20 made of metal has a cylindrical lower insertion portion formed so that the outer diameter is equal to the inner diameter of the through-hole 2 and has the same length as the height of the through-hole 2 protruding downward. 21 and an upper cylindrical portion 22 having an outer diameter larger than that of the lower fitting insertion portion 21 were processed so as to form a two-stage cylindrical shape in which the center lines were connected. Further, the hollow portion penetrates the center of the liquid filling plug 20 up and down, and the lower cylindrical hole 23 having a female screw portion on the inner peripheral surface and the upper cylindrical hole 24 having a larger inner diameter share the central plug. Then, it was produced so as to form a two-stage cylindrical hole connected in order, and this was used as the liquid injection hole 25. Reference numeral 30 denotes a circular flat packing having a hollow portion 31 at the center, which is made of polytetrafluoroethylene (PTFE) and has flexibility.
図1において、符号40は金属からなる封止用ネジ栓で、前記注液栓20の下部円筒孔23に螺合する雄ネジ部を形成したネジ軸部41と、該ネジ軸部41の上部に該ネジ軸部41の外径よりは大きく該注液栓20の上部円筒孔24の内径よりは小さい外径を有するネジ頭部42が一体に形成されている。ここで、該ネジ頭部42の高さと環状パッキング30の厚さの和は、該上部円筒孔24の深さより大きくなるように加工する。更に、該ネジ頭部42の上端外側縁には鍔部43が形成されている。該鍔部43は、該ネジ頭部42の外側縁全周に渡り形成され、封止用ネジ栓40のネジ軸部41を注液栓20の下部円筒孔23に螺合した時に該注液栓20の上面に当接する大きさに形成されている。なお、符号44は該封止用ネジ栓40を螺合する際に使用するドライバー等の工具の作用部の形状に合わせて、該封止用ネジ栓40上面に形成された溝である。 In FIG. 1, reference numeral 40 denotes a sealing screw plug made of metal, and includes a screw shaft portion 41 having a male screw portion screwed into the lower cylindrical hole 23 of the liquid injection plug 20, and an upper portion of the screw shaft portion 41. Further, a screw head 42 having an outer diameter larger than the outer diameter of the screw shaft portion 41 and smaller than the inner diameter of the upper cylindrical hole 24 of the liquid injection stopper 20 is integrally formed. Here, the sum of the height of the screw head 42 and the thickness of the annular packing 30 is processed to be larger than the depth of the upper cylindrical hole 24. Further, a flange 43 is formed on the outer edge of the upper end of the screw head 42. The flange 43 is formed over the entire periphery of the outer edge of the screw head 42, and when the screw shaft portion 41 of the sealing screw plug 40 is screwed into the lower cylindrical hole 23 of the liquid injection plug 20, the liquid injection is performed. It is sized to abut on the upper surface of the stopper 20. Reference numeral 44 denotes a groove formed on the upper surface of the sealing screw plug 40 in accordance with the shape of the working portion of a tool such as a screwdriver used when the sealing screw plug 40 is screwed.
このように構成された各部材は、次のように組み立てられ、電槽蓋1の貫通孔2を密閉する。 Each member comprised in this way is assembled as follows, and seals the through-hole 2 of the battery case lid 1.
電槽蓋1の貫通孔2に注液栓20の下部嵌挿部21を嵌挿して該貫通孔2と注液孔25とが連通した状態とし、該注液栓20の上部円筒部22が該電槽蓋1の上面に当接した時に、該貫通孔2の下端と該注液栓20の下部嵌挿部21の下端が面一となり、この面一となった部分をアルゴンアーク溶接やTIG溶接等によりガス溶接し、該電槽蓋1に該注液栓20を気密に取り付ける。この状態で、正極と負極を交互にセパレータを介して積層した極板群が収納された電槽缶の上部開口部に電槽蓋を施し、該注液栓20の注液孔25から非水電解液を電槽缶内に所定量注液する。 The lower insertion portion 21 of the liquid injection plug 20 is inserted into the through hole 2 of the battery case lid 1 so that the through hole 2 and the liquid injection hole 25 communicate with each other. When abutting on the upper surface of the battery case lid 1, the lower end of the through hole 2 and the lower end of the lower fitting insertion portion 21 of the injection plug 20 are flush with each other, and this flushed portion is subjected to argon arc welding or Gas injection is performed by TIG welding or the like, and the liquid injection stopper 20 is attached to the battery case lid 1 in an airtight manner. In this state, a battery case cover is applied to the upper opening portion of the battery case in which the electrode plate group in which the positive electrode and the negative electrode are alternately laminated via the separator is housed, and the non-water is supplied from the injection hole 25 of the injection stopper 20. A predetermined amount of electrolyte is poured into the battery case.
次いで、封止用ネジ栓40のネジ軸部41を環状パッキング30の中空部31に挿入し、該封止用ネジ栓40の上面の溝44にドライバーを差し込み、該ネジ軸部41を注液栓20の下部円筒孔23内周面の雌ネジ部に螺合し、該封止用ネジ栓40を注液孔25に該環状パッキング30を介して締結した。この時、該環状パッキング30はつぶれ、該封止用ネジ栓40のネジ頭部42の上端外側縁に設けた鍔部43は、該注液栓20の上面に空隙なく当接し着接する。なお、該封止用ネジ栓40および該注液栓20の寸法公差により多少の締結ズレが生じた場合は、強く締めるなどして調節し、着接を確実にする。この際、該環状パッキング30の柔軟性により、気密性が阻害されることはない。該環状パッキング30としてPTFEを用いた場合、該鍔部43が該注液栓20の上面から0.1〜0.5mm程度突出しても、トルク締めの圧縮により着接させることができた。 Next, the screw shaft portion 41 of the sealing screw plug 40 is inserted into the hollow portion 31 of the annular packing 30, a screwdriver is inserted into the groove 44 on the upper surface of the sealing screw plug 40, and the screw shaft portion 41 is injected. The sealing screw plug 40 was fastened to the liquid injection hole 25 through the annular packing 30 by screwing into a female screw portion of the inner peripheral surface of the lower cylindrical hole 23 of the plug 20. At this time, the annular packing 30 is crushed, and the flange 43 provided on the outer edge of the upper end of the screw head 42 of the sealing screw plug 40 contacts and adheres to the upper surface of the liquid injection plug 20 without a gap. In addition, when a slight fastening deviation occurs due to a dimensional tolerance of the sealing screw plug 40 and the liquid filling plug 20, it is adjusted by tightening firmly to ensure attachment. At this time, the airtightness is not inhibited by the flexibility of the annular packing 30. When PTFE was used as the annular packing 30, even if the flange 43 protruded from the upper surface of the liquid filling tap 20 by about 0.1 to 0.5 mm, it could be attached by compression of torque tightening.
この状態でLIBは気密となり、通常の大気雰囲気下に電池を搬送することが可能である。そして、注液栓20の上面とこれに着接した封止用ネジ栓40の鍔部43をレーザー溶接もしくは電子ビーム溶接をして密閉作業は完了する。 In this state, the LIB becomes airtight, and the battery can be transported in a normal air atmosphere. The sealing operation is completed by laser welding or electron beam welding of the upper surface of the liquid injection plug 20 and the flange 43 of the sealing screw plug 40 attached thereto.
ここで、該鍔部43の厚みは、0.2〜0.5mm程度設けることで良好な気密性と溶接強度を得られる。 Here, the thickness of the flange portion 43 is about 0.2 to 0.5 mm, whereby good hermeticity and welding strength can be obtained.
この様にして密閉されたLIB用注液部は、図2に示す従来の注液部と比較し用いる部品数を低減できて構造を簡素化し得、同時に小型化できる。 The LIB liquid injection part sealed in this way can reduce the number of parts used compared to the conventional liquid injection part shown in FIG. 2, simplify the structure, and simultaneously reduce the size.
更に、LIBは電解液注液後の初充電で電解液が分解し、電解液成分の分解ガスが発生して電槽缶や内部構成物の膨張を起こす場合があるが、前述の通り、封止用ネジ栓40を締結した後は通常の大気雰囲気下に搬送できるため、充電した後に、グローブボックス内等の不活性ガス雰囲気下にて該封止用ネジ栓40を緩めて分解ガスを排出して電槽缶や内部構成物の膨張を元に戻し、該封止用ネジ栓40を再び締結して鍔部43を注液栓20の上面に着接した後、通常の大気雰囲気下にLIBを搬送し、着接した該鍔部43と該注液栓20の上面とを溶接することもできる。 In addition, LIB may decompose in the initial charge after electrolyte injection, generating decomposition gas of the electrolyte component and causing expansion of the battery case and internal components. After fastening the stopper screw cap 40, it can be transported in a normal air atmosphere. Therefore, after charging, the sealing screw stopper 40 is loosened in an inert gas atmosphere such as in a glove box, and the decomposition gas is discharged. Then, the expansion of the battery case can and the internal components are restored, the screw cap 40 for sealing is fastened again, and the collar portion 43 is attached to the upper surface of the liquid injection cap 20, and is then put into a normal atmosphere. LIB can be conveyed, and the flange 43 and the upper surface of the liquid injection stopper 20 can be welded together.
更に、注液装置とレーザー溶接装置とを別体とすることが可能なので装置を大型化する必要がなく、また汎用の溶接機器を使用できるため製造コストの大幅な削減が可能である等の効果を奏するものである。 Furthermore, since the liquid injection device and the laser welding device can be separated, there is no need to increase the size of the device, and a general-purpose welding device can be used, so that the manufacturing cost can be greatly reduced. It plays.
1 電槽蓋
2 貫通孔
20 注液栓
23 下部円筒孔
24 上部円筒孔
25 注液孔
30 環状パッキング
40 封止用ネジ栓
43 鍔部
DESCRIPTION OF SYMBOLS 1 Battery case cover 2 Through-hole 20 Injection plug 23 Lower cylindrical hole 24 Upper cylindrical hole 25 Injection hole 30 Ring packing 40 Sealing screw plug 43 Butt
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WO2021057763A1 (en) * | 2019-09-23 | 2021-04-01 | 湖南弘毅科技有限公司 | Lithium battery and method for testing airtightness of lithium battery |
CN112635934B (en) * | 2021-03-10 | 2021-07-30 | 江苏时代新能源科技有限公司 | Sealing assembly for sealing through hole, method and device for preparing battery cell |
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