JP2009283335A - Battery - Google Patents
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- JP2009283335A JP2009283335A JP2008135175A JP2008135175A JP2009283335A JP 2009283335 A JP2009283335 A JP 2009283335A JP 2008135175 A JP2008135175 A JP 2008135175A JP 2008135175 A JP2008135175 A JP 2008135175A JP 2009283335 A JP2009283335 A JP 2009283335A
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
本発明は電池の端子部の構造に関するものである。 The present invention relates to the structure of a terminal portion of a battery.
電池には、外部に電流を取り出すための正極端子と負極端子が必要である。電池ケースや電池蓋が金属製の場合、電池の端子構造には主に次の２種類が採用されている。 A battery requires a positive electrode terminal and a negative electrode terminal for taking out current to the outside. When the battery case and the battery lid are made of metal, the following two types of battery terminal structures are mainly employed.
携帯電話用リチウムイオン電池などの小型電池では、主に、電池ケースおよび電池蓋が一方の端子を兼ね、他方の端子は絶縁体を介して電池蓋から取り出されている構造が採用されている。 In a small battery such as a lithium ion battery for a mobile phone, a structure in which a battery case and a battery lid also serve as one terminal and the other terminal is taken out from the battery lid via an insulator is employed.
一方、産業用などの容量が約５Ａｈを越える大型電池の場合には、主に、正極端子と負極端子がともに絶縁体（パッキン）を介して電池蓋から取り出されている構造が採用されている。 On the other hand, in the case of a large battery having a capacity of more than about 5 Ah for industrial use, a structure in which both the positive electrode terminal and the negative electrode terminal are taken out from the battery cover via an insulator (packing) is mainly used. .
本発明は、正極端子と負極端子がともに絶縁体を介して電池蓋から取り出されている構造の電池の端子構造に関するものである。 The present invention relates to a battery terminal structure in which both a positive electrode terminal and a negative electrode terminal are taken out of a battery lid via an insulator.
電池の端子と他の電子機器の端子との接続には接続板を用い、電池の端子をボルト状とし、接続体をナットで締めつけて接続している。また、多数の電池を直列や並列に接続して組電池にする際も、隣接する電池端子間の接続も同様の方法が採用されている。 A connection plate is used to connect the battery terminals to the terminals of other electronic devices, the battery terminals are bolted, and the connection body is tightened with a nut for connection. In addition, when a large number of batteries are connected in series or in parallel to form an assembled battery, the same method is used for connection between adjacent battery terminals.
ボルト形状の電池端子に接続板をナットで締めつける場合、端子部分に大きなトルクが加わり、端子やパッキンが回転してしまい、端子と電池蓋間の絶縁不良や端子と電池ケース内部の発電要素との接続不良による集電性能の低下などが発生するという問題があった。 When the connection plate is tightened to the bolt-shaped battery terminal with a nut, a large torque is applied to the terminal part, and the terminal and packing rotate, resulting in poor insulation between the terminal and the battery cover, and between the terminal and the power generation element inside the battery case. There was a problem that the current collection performance was lowered due to poor connection.
この問題を解決するために、すでに次のような技術が開示されている。 In order to solve this problem, the following techniques have already been disclosed.
特許文献１には、出力端子が端子本体とその基部に形成された端子基体部からなり、パッキンに、端子基体部の形状とほぼ同形状で、端子基体部と嵌合する凹部を設けることにより、端子の空転を防止する技術が開示されている。 In Patent Document 1, an output terminal is composed of a terminal main body and a terminal base portion formed at the base thereof, and the packing is provided with a recess that is substantially the same shape as the terminal base portion and fits into the terminal base portion. A technique for preventing idling of a terminal is disclosed.
特許文献２には、電池蓋の端子取付孔に、絶縁パッキングを介して嵌合された出力端子を有し、出力端子の下側と蓋の上側に突起を設け、パッキングのフランジ部への出力端子頭部の押圧力で、突起をパッキングのフランジ部に食い込ませることにより、端子とパッキングの回転を防止する技術が開示されている。 In Patent Document 2, the terminal mounting hole of the battery lid has an output terminal fitted through an insulating packing, and a protrusion is provided on the lower side of the output terminal and on the upper side of the lid, and output to the flange portion of the packing A technique for preventing the rotation of the terminal and the packing by causing the protrusion to bite into the flange portion of the packing with the pressing force of the terminal head is disclosed.
しかし、特許文献１に開示の技術では、パッキンの凹部に端子基体部を嵌合させているだけであるため、端子に強いトルクが加わった場合、端子とパッキンが同時に回転してしまうという問題があった。また、特許文献２に開示の技術では、出力端子の下側と蓋の上側に突起をパッキングのフランジ部に食い込ませることで、端子とパッキングの回転を防止するものであるが、突起を食い込ませるためには、パッキングのフランジ部を、出力端子頭部と電池蓋との間で強く締め付ける必要があった。 However, in the technique disclosed in Patent Document 1, since the terminal base portion is only fitted in the recess of the packing, when a strong torque is applied to the terminal, the terminal and the packing rotate at the same time. there were. Further, in the technique disclosed in Patent Document 2, the protrusion is bitten into the flange portion of the packing on the lower side of the output terminal and the upper side of the lid, thereby preventing the rotation of the terminal and the packing. For this purpose, it is necessary to strongly tighten the flange portion of the packing between the output terminal head and the battery lid.
そこで本発明の目的は、これら従来の技術の問題点を解決し、端子に強いトルクを加えた場合でも、端子とパッキングの回転を確実に防止することのできる、電池の端子部構造を提供することにある。
請求項１の発明は、電池蓋にパッキンを介して絶縁状態で取り付けられた出力端子を備えた電池において、前記出力端子は端子本体と端子本体基部に形成された端子基体部とを備え、前記パッキンには前記出力端子の端子基体部が嵌合する凹部を備え、前記端子基体部が前記パッキンの凹部に嵌合し、前記電池蓋には前記パッキンの凹部とは異なる場所に前記パッキンを貫通する突起を設けたことを特徴とする。 The invention of claim 1 is a battery comprising an output terminal attached in an insulated state to a battery lid via a packing, wherein the output terminal comprises a terminal body and a terminal base part formed on a terminal body base, The packing includes a recess into which the terminal base portion of the output terminal is fitted, the terminal base portion is fitted into the recess of the packing, and the battery cover penetrates the packing at a location different from the recess of the packing. Protruding protrusions are provided.
請求項１の発明によれば、パッキンの凹部に出力端子の端子基体部が嵌合しており、かつ、電池蓋に、パッキンの凹部とは異なる場所にパッキンを貫通する突起を設けることにより、端子に強いトルクを加えた場合でも、端子とパッキングの回転を確実に防止することができる。その結果、端子と電池蓋間の絶縁不良や端子や電池ケース内部の発電要素との接続不良による集電性能の低下などが発生することのない電池を得ることができる。 According to the invention of claim 1, the terminal base portion of the output terminal is fitted in the recess of the packing, and the battery lid is provided with a protrusion penetrating the packing at a place different from the recess of the packing. Even when a strong torque is applied to the terminal, the rotation of the terminal and the packing can be reliably prevented. As a result, it is possible to obtain a battery in which there is no occurrence of poor insulation performance between the terminal and the battery lid, or deterioration in current collecting performance due to poor connection between the terminal and the power generation element inside the battery case.
以下、本発明の最良の実施形態について、図面を参照して説明する。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.
図１は本発明の電池の端子構造の外観を示す斜視図で、図２は図１のＡ−Ａ’断面を示したものである。図１および図２において、１は電池蓋、２は外部パッキン、３は外部パッキンの凹部、４は出力端子本体、５は出力端子基体部、６（６ａ，６ｂ、６ｃ）は電池蓋に設けた突起、７は内部パッキン、８は集電板、９はリベット部である。 FIG. 1 is a perspective view showing an appearance of a battery terminal structure of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A 'of FIG. 1 and 2, 1 is a battery cover, 2 is an external packing, 3 is a recess of the external packing, 4 is an output terminal body, 5 is an output terminal base, and 6 (6a, 6b, 6c) is provided on the battery cover. 7 is an internal packing, 8 is a current collector plate, and 9 is a rivet portion.
図１および図２に示すように、端子基体部５はパッキンの凹部３に嵌合している。この場合、端子基体部５とパッキンの凹部３とのすき間はできるだけ小さく、端子基体部５がパッキンの凹部３にしっかりと嵌合していることが好ましい。また、突起６はパッキン２を貫通している。 As shown in FIGS. 1 and 2, the terminal base 5 is fitted in the recess 3 of the packing. In this case, it is preferable that the gap between the terminal base portion 5 and the recess 3 of the packing is as small as possible, and the terminal base portion 5 is firmly fitted in the recess 3 of the packing. Further, the protrusion 6 penetrates the packing 2.
図２に示すように、出力端子本体４の下端はリベット部９となっており、電池蓋１を外部パッキン２と内部パッキン７で挟み、内部パッキン７とリベット部９との間に集電板８を挟んでいる。したがって、出力端子本体４と集電板８は電気的に接続されており、出力端子本体４と集電板８は外部パッキン２および内部パッキン７によって、電池蓋１とは絶縁されている。なお、図２では示していないが、集電板８は電池内部の発電要素の一方の電極に接続されている。 As shown in FIG. 2, the lower end of the output terminal body 4 is a rivet portion 9, the battery cover 1 is sandwiched between the outer packing 2 and the inner packing 7, and the current collector plate is interposed between the inner packing 7 and the rivet portion 9. 8 is sandwiched. Therefore, the output terminal body 4 and the current collector plate 8 are electrically connected, and the output terminal body 4 and the current collector plate 8 are insulated from the battery lid 1 by the outer packing 2 and the inner packing 7. Although not shown in FIG. 2, the current collector plate 8 is connected to one electrode of the power generation element inside the battery.
電池蓋１、端子本体４および端子基体部５材質は金属、また、パッキン２の材質は絶縁体である。なお、端子本体４の上部は、他の電子機器や電池との接続が容易なように、ボルト形状としておくことが好ましい。 The battery lid 1, the terminal body 4 and the terminal base 5 are made of metal, and the packing 2 is made of an insulator. Note that the upper portion of the terminal body 4 is preferably formed in a bolt shape so that it can be easily connected to other electronic devices and batteries.
突起６は電池蓋１に設ける。突起の材質は特に限定されないが、力が加わったときに変形しない硬質な材料を用いる。突起６は電池蓋１に固定されていればよいので、突起の材質が樹脂などの場合には接着等で固定しても良い。突起の材質が金属の場合には、スポット溶接等の方法で、突起６と電池蓋１を固定することが好ましい。 The protrusion 6 is provided on the battery lid 1. The material of the protrusion is not particularly limited, but a hard material that does not deform when a force is applied is used. Since the protrusions 6 need only be fixed to the battery lid 1, when the protrusions are made of resin, the protrusions 6 may be fixed by bonding or the like. When the material of the protrusion is metal, it is preferable to fix the protrusion 6 and the battery lid 1 by a method such as spot welding.
突起６の形状は特に限定されず、円柱状、角柱状、球形などを用いることができる。また、図１には、突起の数が３つの場合を示したが、突起６の数は１つ以上設ければよく、また、突起６を電池蓋１に取りつける場所も、パッキンの凹部とは異なる場所であれば特に限定されない。 The shape of the protrusion 6 is not particularly limited, and a cylindrical shape, a prismatic shape, a spherical shape, or the like can be used. 1 shows the case where the number of protrusions is three, the number of protrusions 6 may be one or more, and the place where the protrusions 6 are attached to the battery lid 1 is also the recess of the packing. If it is a different place, it will not be specifically limited.
なお、電池蓋１を作製する際に、あらかじめ突起６を設けておけば、突起６を電池蓋１に固定する工程を省略することができる。 In addition, if the projection 6 is provided in advance when the battery lid 1 is manufactured, the step of fixing the projection 6 to the battery lid 1 can be omitted.
このように、本発明の電池の端子部構造とすることにより、パッキンの凹部に出力端子の端子基体部がしっかりと嵌合し、かつ、電池蓋にパッキンを貫通する突起が設けられているため、接続に際し、端子に強いトルクを加えた場合でも、端子とパッキングの回転を確実に防止することができる。その結果、端子と電池蓋間の絶縁不良や端子や電池ケース内部の発電要素との接続不良による集電性能の低下などが発生することのない電池を得ることができる。 As described above, since the battery terminal portion structure of the present invention is used, the terminal base portion of the output terminal is firmly fitted in the recess of the packing, and the protrusion that penetrates the packing is provided in the battery lid. In connection, even when a strong torque is applied to the terminal, the rotation of the terminal and the packing can be surely prevented. As a result, it is possible to obtain a battery in which there is no occurrence of poor insulation performance between the terminal and the battery lid, or deterioration in current collecting performance due to poor connection between the terminal and the power generation element inside the battery case.
本発明について、以下の実施例では非水電解質二次電池について述べるが、本発明の端子構造は非水電解質二次電池以外の電池にも適用可能である。 The present invention will be described with reference to non-aqueous electrolyte secondary batteries in the following examples. However, the terminal structure of the present invention can be applied to batteries other than non-aqueous electrolyte secondary batteries.
［実施例１］
電池としては、角型電池ケースに長円筒巻回型発電要素を収納した非水電解質二次電池を用い、正極活物質にコバルト酸リチウム、負極活物質にグラファイト、電解液にエチレンカーボネート（ＥＣ）とエチルメチルカーボネートの体積比１：１混合溶媒にＬｉＰＦ６を１ｍｏｌ／Ｌの濃度となるように溶解した有機電解液を用いたものを使用した。
[Example 1]
As the battery, a non-aqueous electrolyte secondary battery in which a long cylindrical winding type power generation element is housed in a rectangular battery case is used. Lithium cobaltate as a positive electrode active material, graphite as a negative electrode active material, and ethylene carbonate (EC) as an electrolyte solution A solution using an organic electrolytic solution in which LiPF 6 was dissolved in a mixed solvent of 1: 1 and volume ratio of ethylmethyl carbonate to a concentration of 1 mol / L was used.
帯状正極板は、正極活物質としてのコバルト酸リチウム(ＬｉＣｏＯ２)８６重量％と、導電助剤としてのアセチレンブラック（ＡＢ）６重量％と、結着剤としてのポリフッ化ビニリデン（ＰＶｄＦ）８重量％とを混合し、この混合物にＮ−メチルピロリドン（ＮＭＰ）を加えて正極合剤ペーストとし、この正極合剤ペーストを厚さ２０μｍの帯状アルミニウム集電体の両面に塗布し、乾燥後、ロールプレスで圧縮成型したものである。 The strip-like positive electrode plate comprises 86% by weight of lithium cobaltate (LiCoO 2 ) as a positive electrode active material, 6% by weight of acetylene black (AB) as a conductive additive, and 8% by weight of polyvinylidene fluoride (PVdF) as a binder. %, And N-methylpyrrolidone (NMP) is added to the mixture to form a positive electrode mixture paste. This positive electrode mixture paste is applied to both sides of a 20 μm-thick strip-shaped aluminum current collector, dried, and then rolled. It is compression-molded with a press.
帯状負極板は、負極活物質としてのグラファイト９５重量％と結着剤としてのＰＶｄＦ５重量％とを混合し、この混合物にＮＭＰを加えて負極合剤ペーストとし、この負極合剤ペーストを厚さ１５μｍの帯状銅集電体の両面に塗布し、乾燥後、ロールプレスで圧縮成型したものである。 The strip-shaped negative electrode plate was prepared by mixing 95% by weight of graphite as a negative electrode active material and 5% by weight of PVdF as a binder, adding NMP to this mixture to form a negative electrode mixture paste, and the negative electrode mixture paste having a thickness of 15 μm. This is applied to both sides of the belt-shaped copper current collector, dried, and compression molded by a roll press.
セパレータには厚さ２５μｍの微多孔性ポリエチレンフィルムを用いた。 As the separator, a microporous polyethylene film having a thickness of 25 μm was used.
長円筒巻回型発電要素は、巻芯の周囲に帯状正極板と帯状負極板とをセパレータを介して、必要な回数だけ巻回することによって作製した。 The long cylindrical winding type power generation element was produced by winding a strip-shaped positive electrode plate and a strip-shaped negative electrode plate around a core through a separator as many times as necessary.
巻回する場合、正極板と負極板とをそれぞれ上下にずらして巻回することにより、巻回型発電要素の下端部から正極合剤層未塗布部のみを突出させ、上端部から負極合剤層未塗布部のみを突出させた。セパレータは、正極合剤層と負極合剤層が対向する部分の間に存在し、正極合剤層未塗布部および負極合剤層未塗布部は覆わないようにようにして巻回した。 When winding, the positive electrode plate and the negative electrode plate are respectively wound up and down to cause only the positive electrode mixture layer uncoated portion to protrude from the lower end portion of the wound power generation element, and the negative electrode mixture from the upper end portion. Only the uncoated part of the layer was protruded. The separator was wound between the portion where the positive electrode mixture layer and the negative electrode mixture layer face each other, and was wound so as not to cover the positive electrode mixture layer uncoated portion and the negative electrode mixture layer uncoated portion.
正極の集電は、発電要素の下端部から突出した正極合剤層未塗布部でおこない、負極の集電は、発電要素の上端部から突出した負極合剤層未塗布部でおこなった。 The current collection of the positive electrode was performed in the positive electrode mixture layer uncoated portion protruding from the lower end portion of the power generation element, and the current collection of the negative electrode was performed in the negative electrode mixture layer uncoated portion protruding from the upper end portion of the power generation element.
得られた長円筒巻回型発電要素を角型アルミニウム合金製の電池ケースに収納し、電解液を注入した後、電池ケースと電池蓋とを溶接することにより、設計容量１０Ａｈの長円筒型非水電解質二次電池とした。単セルの寸法は、幅１２０ｍｍ、高さ８０ｍｍ、厚さ２０ｍｍであり、重量は０．５ｋｇであった。なお、電池蓋の材質もアルミニウム合金製である。 The obtained long cylindrical wound type power generation element is housed in a battery case made of rectangular aluminum alloy, and after injecting an electrolyte, the battery case and the battery lid are welded to form a long cylindrical non-current having a design capacity of 10 Ah. A water electrolyte secondary battery was obtained. The single cell had a width of 120 mm, a height of 80 mm, a thickness of 20 mm, and a weight of 0.5 kg. The battery lid is also made of an aluminum alloy.
この非水電解質二次電池の正極端子および負極端子は、いずれもパッキンを介して電池蓋に取り付けられており、正極端子の材質は端子本体４および端子基体部５ともアルミニウム、負極端子の材質は端子本体４および端子基体部５とも銅とした。 The positive electrode terminal and the negative electrode terminal of the non-aqueous electrolyte secondary battery are both attached to the battery lid via packing, and the material of the positive electrode terminal is aluminum for both the terminal body 4 and the terminal base 5 and the material of the negative electrode terminal is Both the terminal body 4 and the terminal base 5 were made of copper.
正極端子および負極端子の構造の外観は図１に示したのと同じであり、断面は図２に示したのと同じであり、端子本体４部分は直径８ｍｍ、高さ１５ｍｍとし、上部には雄ねじが設けられ、ボルト状となっている。そして、端子基体部の大きさは１５ｍｍ×２０ｍｍ、高さ２ｍｍとした。 The external appearance of the structure of the positive electrode terminal and the negative electrode terminal is the same as that shown in FIG. 1, the cross section is the same as that shown in FIG. 2, the terminal body 4 is 8 mm in diameter and 15 mm in height, A male screw is provided and it has a bolt shape. And the magnitude | size of the terminal base | substrate part was 15 mm x 20 mm, and height 2mm.
パッキン２の材質はポリフェニレンサルファイド（ＰＰＳ）で、最大平面部分の大きさは１８ｍｍ×４０ｍｍ、最大高さは３ｍｍ、突起６を取り付ける部分の高さは１ｍｍとした。そして、端子基体部を嵌合させるための、大きさ１５．１ｍｍ×２０．１ｍｍ、深さ２ｍｍの凹部が設けられている。 The material of the packing 2 is polyphenylene sulfide (PPS), the size of the maximum plane portion is 18 mm × 40 mm, the maximum height is 3 mm, and the height of the portion to which the protrusions 6 are attached is 1 mm. A recess having a size of 15.1 mm × 20.1 mm and a depth of 2 mm for fitting the terminal base portion is provided.
突起６は、直径２ｍｍのＳＵＳ球を電池蓋１にスポット溶接したものであり、図１に示したように、６ａ、６ｂ、６ｃの３箇所に設けた。そして、突起６はパッキン２を貫通しており、パッキンの上に突出している。 The protrusions 6 were obtained by spot welding SUS balls having a diameter of 2 mm to the battery lid 1 and were provided at three locations 6a, 6b, and 6c as shown in FIG. And the protrusion 6 has penetrated the packing 2, and protrudes on the packing.
そして、図１および図２に示すように、端子基体部５はパッキンの凹部３にしっかりと嵌合している。 As shown in FIGS. 1 and 2, the terminal base 5 is firmly fitted in the recess 3 of the packing.
［実施例２］
突起６を、６ｂと６ｃの２箇所に設けたこと以外は実施例１と同様にして、実施例２の非水電解質二次電池を作製した。
[Example 2]
A nonaqueous electrolyte secondary battery of Example 2 was fabricated in the same manner as Example 1 except that the protrusions 6 were provided at two locations 6b and 6c.
［実施例３］
突起６を、６ａの１箇所に設けたこと以外は実施例１と同様にして、実施例３の非水電解質二次電池を作製した。
[Example 3]
A nonaqueous electrolyte secondary battery of Example 3 was fabricated in the same manner as Example 1 except that the protrusion 6 was provided at one location 6a.
［比較例１］
突起６を設けなかったこと以外は実施例１と同様にして、比較例１の非水電解質二次電池を作製した。
[Comparative Example 1]
A nonaqueous electrolyte secondary battery of Comparative Example 1 was produced in the same manner as Example 1 except that the protrusions 6 were not provided.
［試験結果］
実施例１〜３および比較例１の非水電解質二次電池各２０個について、端子板を用いて隣接する非水電解質二次電池と接続した。端子板をナットで端子本体のボルト部に取り付ける場合の、ナット締め付けトルクを５ｋｇｆ・ｃｍとし、締め付けた後の、パッキンの状態および端子と電池蓋間の絶縁状態を測定した。測定結果を表１にまとめた。なお、表１の数値は電池の個数を示す。
[Test results]
Each of the 20 nonaqueous electrolyte secondary batteries of Examples 1 to 3 and Comparative Example 1 was connected to an adjacent nonaqueous electrolyte secondary battery using a terminal plate. When the terminal plate was attached to the bolt portion of the terminal body with a nut, the nut tightening torque was 5 kgf · cm, and the state of packing and the insulation state between the terminal and the battery lid after tightening were measured. The measurement results are summarized in Table 1. In addition, the numerical value of Table 1 shows the number of batteries.
表１の結果から、端子基体部がパッキンの凹部に嵌合し、かつ、電池蓋にはパッキンの凹部とは異なる場所にパッキンを貫通する突起を設けた実施例１〜３の非水電解質二次電池では、端子板をナットで端子本体のボルト部に取り付けた後でも、パッキンの状態に全くゆがみが認められず、端子と電池蓋間の絶縁状態は良好に保たれていたのに対し、電池蓋に突起を設けなかった比較例１の電池では、パッキンの状態にゆがみが発生し、端子と電池蓋間の絶縁状態が不良になる場合が生じることがわかった。 From the results of Table 1, the non-aqueous electrolytes of Examples 1 to 3 in which the terminal base portion was fitted in the recess of the packing and the battery lid was provided with a protrusion penetrating the packing at a location different from the recess of the packing. In the secondary battery, even after the terminal plate was attached to the bolt part of the terminal body with the nut, no distortion was observed in the packing state, and the insulation state between the terminal and the battery lid was maintained well, It was found that in the battery of Comparative Example 1 in which no protrusion was provided on the battery cover, the packing state was distorted and the insulation state between the terminal and the battery cover might be poor.
１ 電池蓋
２ 外部パッキン
３ 外部パッキンの凹部
４ 出力端子本体
５ 出力端子の基体部
６ 突起
７ 内部パッキン
８ 集電板
９ リベット部
DESCRIPTION OF SYMBOLS 1 Battery cover 2 External packing 3 Recessed part of external packing 4 Output terminal body 5 Base part of output terminal 6 Protrusion 7 Internal packing 8 Current collecting plate 9 Rivet part
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