JP6314737B2 - Secondary battery and manufacturing method thereof - Google Patents

Secondary battery and manufacturing method thereof Download PDF

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JP6314737B2
JP6314737B2 JP2014162871A JP2014162871A JP6314737B2 JP 6314737 B2 JP6314737 B2 JP 6314737B2 JP 2014162871 A JP2014162871 A JP 2014162871A JP 2014162871 A JP2014162871 A JP 2014162871A JP 6314737 B2 JP6314737 B2 JP 6314737B2
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partition wall
gap
secondary battery
extending
free end
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JP2016039084A (en
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昌時 宮田
昌時 宮田
北森　茂孝
茂孝 北森
政崇 鈴木
政崇 鈴木
俊輔 米谷
俊輔 米谷
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Showa Denko Materials Co Ltd
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Hitachi Chemical Co Ltd
Showa Denko Materials Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Description

本発明は、２つの極板群の２つの極柱どうしが仕切壁部の自由端部の外側で溶接されて形成された接続部を備えている二次電池及びその製造方法に関するものである。   The present invention relates to a secondary battery including a connection portion formed by welding two pole columns of two electrode plate groups on the outside of a free end portion of a partition wall portion, and a method for manufacturing the same.

鉛蓄電池等の二次電池は、自動車用バッテリ、フォークリフト等の電動車、及び、無停電電源装置等、様々な用途に用いられている。   Secondary batteries such as lead storage batteries are used in various applications such as automobile batteries, electric vehicles such as forklifts, and uninterruptible power supplies.

特許第２９９３０４３号公報（特許文献１）の図６及び図７には、２つの極板群の２つの極柱どうしを仕切壁部の自由端部の外側で溶接して接続部を形成することが難しいことが開示されている。   In FIG. 6 and FIG. 7 of Japanese Patent No. 2999343 (Patent Document 1), two pole columns of two electrode plate groups are welded to each other outside the free end portion of the partition wall portion to form a connection portion. It is disclosed that it is difficult.

特許第２９９３０４３号公報 図６及び図７Japanese Patent No. 2999343 gazette 6 and 7

特許文献１に示された従来の技術では、仕切壁部の外側に位置する２つの極柱部分を単純に突き合わせて開先部を形成して、開先部に沿って電気溶接を行っている。そのため溶融金属が開先部の底部から下方に落下し、落下した溶融金属が極板間短絡を生じさせる問題があった。   In the conventional technique shown in Patent Document 1, a groove portion is formed by simply abutting two pole column portions located outside the partition wall portion, and electric welding is performed along the groove portion. . Therefore, there has been a problem that the molten metal falls downward from the bottom of the groove, and the dropped molten metal causes a short circuit between the electrode plates.

本発明の目的は、２つの極板群の２つの極柱どうしが仕切壁部の自由端部の外側で溶接されて形成された接続部の下方に溶融金属が落下しない二次電池及びその製造方法を提供することにある。   An object of the present invention is to provide a secondary battery in which molten metal does not fall below a connecting portion formed by welding two pole columns of two electrode plate groups on the outside of a free end portion of a partition wall portion, and manufacturing the same. It is to provide a method.

本発明の二次電池は、仕切壁部によって仕切られた少なくとも２つの電槽セルを有する電槽本体と、それぞれ極柱を備えて少なくとも２つの電槽セルに収納された少なくとも２つの極板群と、２つの極板群の２つの極柱どうしが仕切壁部の自由端部の外側で溶接されて形成された接続部とを備えている。本願明細書においては、仕切壁部の自由端部から接続部に向かう方向をＺ方向と定義し、Ｚ方向と直交し且つ仕切壁部の自由端部が延びる方向をＸ方向と定義し、Ｚ方向及びＸ方向と直交する方向をＹ方向と定義する。２つの極板群の２つの極柱は、溶接前に２つの極柱が組み合わされた状態において、仕切壁部の自由端部よりも外側の位置において直接対向する対向面をそれぞれ有している。そして２つの対向面の形状は、２つの対向面間に形成される隙間をＹ方向及びＺ方向に延びる切断面に沿って切断したときの断面形状が、仕切壁部側からＺ方向に延びる第１の部分と、該第１の部分と連続し且つＹ方向に延びる第２の部分と、該第２の部分と連続し且つＺ方向に延びる第３の部分とからなるクランク形状になるように定められている。なお本願明細書において「隙間」とは、巨視的に見て接触する２つの対向面間に形成される隙間であって、２つの対向面が接触していない状態で形成される隙間を含まない。また後述する「隙間の領域の間隙寸法」とは、前述の「隙間」における２つの対向面間に形成される非接触部分における２つの対向面が対向する方向における間隙の寸法を意味する。そして第３の部分が含まれる隙間の領域の少なくとも一部が溶接用の開先部を構成している。本発明の製造方法では、この開先部に沿って電気溶接を実施する。   The secondary battery of the present invention includes a battery case main body having at least two battery case cells partitioned by a partition wall, and at least two electrode plate groups each having a pole column and housed in at least two battery case cells. And two connection poles formed by welding two pole columns of the two electrode plate groups outside the free end of the partition wall. In the present specification, the direction from the free end portion of the partition wall portion toward the connection portion is defined as the Z direction, the direction orthogonal to the Z direction and the free end portion of the partition wall portion is defined as the X direction, and Z The direction orthogonal to the direction and the X direction is defined as the Y direction. The two pole columns of the two electrode plate groups each have opposing surfaces that directly face each other at a position outside the free end of the partition wall in a state where the two pole columns are combined before welding. . The shape of the two facing surfaces is such that the cross-sectional shape when the gap formed between the two facing surfaces is cut along the cutting surfaces extending in the Y direction and the Z direction extends in the Z direction from the partition wall side. A crank shape comprising a first portion, a second portion that is continuous with the first portion and extends in the Y direction, and a third portion that is continuous with the second portion and extends in the Z direction. It has been established. In the specification of the present application, the “gap” is a gap formed between two opposed surfaces that are in contact with each other when viewed macroscopically, and does not include a gap formed when the two opposed surfaces are not in contact with each other. . The “gap size of the gap region” described later means the size of the gap in the direction in which the two facing surfaces in the non-contact portion formed between the two facing surfaces in the “gap” are opposed to each other. And at least one part of the area | region of the clearance gap including the 3rd part comprises the groove part for welding. In the manufacturing method of the present invention, electric welding is performed along this groove portion.

本発明によれば、隙間の第３の部分に形成した開先部で溶接を行うと、溶融金属は開先部の下方に移動し、その後Ｙ方向に延びる第２の部分に入り込む。第２の部分に入り込んだ溶融金属は、凝固する。仮に溶融金属が隙間の第２の部分を越えても、隙間は第１の部分を備えているので、溶融金属が接続部の下方に位置する極板群に落下することはない。したがって、本発明によれば、接続部の下方に溶融金属が落下しない二次電池及びその製造方法を提供することができる。   According to the present invention, when welding is performed at the groove portion formed in the third portion of the gap, the molten metal moves below the groove portion and then enters the second portion extending in the Y direction. The molten metal that has entered the second part solidifies. Even if the molten metal exceeds the second portion of the gap, since the gap includes the first portion, the molten metal does not fall into the electrode plate group located below the connecting portion. Therefore, according to the present invention, it is possible to provide a secondary battery in which molten metal does not fall below the connecting portion and a method for manufacturing the secondary battery.

なお第３の部分が含まれる隙間の領域のＸ方向の両端には、開先部が形成されていないことが好ましい。このような開先部が形成されていない部分を残すと、溶融金属がＸ方向に沿って流れ出ることを確実に防止できる。   In addition, it is preferable that the groove part is not formed in the both ends of the X direction of the area | region of the gap | interval containing a 3rd part. If such a portion where the groove portion is not formed is left, it is possible to reliably prevent the molten metal from flowing out along the X direction.

第２の部分が含まれる隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている。このようにすると溶融金属の下方への落下を確実に防止できる。   The gap size of the gap region including the second portion is determined so that the molten metal can be prevented from entering due to surface tension. In this way, it is possible to reliably prevent the molten metal from falling downward.

また第１の部分が含まれる隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定めてもよい。このようにすると第２の部分が含まれる隙間の領域の長さが短い場合でも、溶融金属が下方へ落下することを確実に防止できる。   The gap size of the gap area including the first portion may be determined so that the molten metal can be prevented from entering due to surface tension. In this way, even when the length of the gap region including the second portion is short, the molten metal can be reliably prevented from falling downward.

開先部の形状は任意であるが、Ｚ方向と逆方向に向かうに従って幅が狭まるＶ字形の開先形状であるのが好ましい。このような開先形状であれば、溶融金属の多くが開先部に溜まることになり、第２の部分が含まれる隙間の領域に入り込む溶融金属の量を少なくすることができる。 The shape of the groove portion is arbitrary, but it is preferably a V-shaped groove shape whose width becomes narrower in the direction opposite to the Z direction. With such a groove shape, most of the molten metal accumulates in the groove portion, and the amount of molten metal that enters the gap region including the second portion can be reduced.

本発明に係る二次電池の一つの実施の形態に含まれる２つの極柱の溶接前の平面図である。It is a top view before welding of the two pole poles contained in one embodiment of the secondary battery which concerns on this invention. 図１の極柱の左側面図である。It is a left view of the pole pole of FIG. 図１の極柱の正面図である。It is a front view of the pole pole of FIG. 図１のＩＶ−ＩＶ線断面図である。It is the IV-IV sectional view taken on the line of FIG. （Ａ）乃至（Ｃ）は、第１の種類の極柱の平面図、正面図及び側面図である。(A) thru | or (C) are the top view, front view, and side view of a 1st type pole pole. （Ａ）乃至（Ｃ）は、第１の種類の極柱と組み合わされる第２の種類の極柱の平面図、正面図及び側面図である。(A) thru | or (C) are the top view, front view, and side view of a 2nd type pole pole combined with a 1st type pole pole. 図１の極柱を含む本発明に係る二次電池の実施の形態を示す斜視図であり、蓋を取り付ける前の状態が示されている。It is a perspective view which shows embodiment of the secondary battery which concerns on this invention containing the pole column of FIG. 1, and the state before attaching a lid | cover is shown. 図５の実施の形態の電槽本体の正面の側面板を切り欠いて示す正面図である。It is a front view which cuts and shows the side plate of the front of the battery case main body of embodiment of FIG.

以下、図面を参照しつつ、本発明に係る二次電池の実施の形態の一例について説明する。本実施の形態の二次電池（鉛蓄電池）は、図７及び図８に示すように、上面が開口した直方体形状の電槽本体２を備えており、電槽本体２の内部には、仕切壁４によって仕切られた６つの電槽セル６が構成されている。各電槽セル６には極板群８がそれぞれ収納されている。極板群８はそれぞれ負極板１０と正極板（図示を省略する。）をセパレータ１２を介して交互に積層して構成されている。各極板群８は、隣接する他の極板群８との接続のために、それぞれ第１の種類の極柱１４と第２の種類の極柱１６とを有している。第１の種類の極柱１４及び第２の種類の極柱１６は、それぞれ負極側極柱及び正極側極柱のいずれにも用いられる。例えば第１の種類の極柱１４または第２の種類の極柱１６が負極側極柱として用いられる場合には、複数枚の負極板１０の耳部が接続された負極集電体（ストラップ）に溶接されている。また第１の種類の極柱１４または第２の種類の極柱１６が正極側極柱として用いられる場合は、複数枚の正極板の耳部が接続された正極集電体（ストラップ）に溶接されている。   Hereinafter, an example of an embodiment of a secondary battery according to the present invention will be described with reference to the drawings. As shown in FIGS. 7 and 8, the secondary battery (lead storage battery) of the present embodiment includes a rectangular parallelepiped battery case body 2 having an open top surface. Six battery case cells 6 partitioned by walls 4 are formed. Each battery cell 6 accommodates an electrode plate group 8. Each of the electrode plate groups 8 is configured by alternately laminating negative electrode plates 10 and positive electrode plates (not shown) via separators 12. Each electrode plate group 8 has a first type of pole column 14 and a second type of pole column 16 for connection with another adjacent electrode plate group 8. The first type pole column 14 and the second type pole column 16 are used for both the negative pole pole and the positive pole pole, respectively. For example, when the first type pole column 14 or the second type pole column 16 is used as a negative electrode side pole column, a negative electrode current collector (strap) to which the ears of a plurality of negative electrode plates 10 are connected. It is welded to. When the first type pole column 14 or the second type pole column 16 is used as the positive pole column, welding is performed on a positive electrode current collector (strap) to which the ears of a plurality of positive electrode plates are connected. Has been.

図４には、隣り合う２つの極板群８，８の第１の種類の極柱１４と第２の種類の極柱１６とが、仕切壁４の自由端部の外側で溶接されて形成される接続部１８を形成する前の状態の断面図が示されている。接続部１８を形成するために、第１の種類の極柱１４と第２の種類の極柱１６との上端部分には、断面形状がＶ字形の開先部２６が設けられている。各極柱１４，１６は鉛合金製である。   In FIG. 4, a first type pole column 14 and a second type pole column 16 of two adjacent electrode plate groups 8 and 8 are welded outside the free end of the partition wall 4. A sectional view of the state before forming the connecting portion 18 is shown. In order to form the connecting portion 18, a groove portion 26 having a V-shaped cross section is provided at the upper end portions of the first type pole column 14 and the second type pole column 16. Each pole column 14 and 16 is made of a lead alloy.

このような二次電池の製造過程において、仕切壁４によって仕切られた２つの電槽セル６にそれぞれ収納された２つの極板群８がそれぞれ有する２つの極柱１４，１６を、仕切壁４の自由端部の外側で溶接により接続して接続部１８を形成する際に、２つの極柱１４，１６が組み合わされて被溶接構造部２８が構成されている。被溶接構造部２８の開先部２６が、ＴＩＧ溶接等により供給される溶融鉛によって埋められて接続部１８が形成される。この溶接の際に、被溶接構造部２８には図示しない溶接用マスク装置が取り付けられる。なお図７及び図８の例では、極柱１４，１６は隔壁４を貫通する貫通溶接部１９によっても接続されている。貫通溶接部１９は、隔壁４に設けた貫通孔の両側に位置する極柱１４及び極柱１６の部分を貫通孔を通して抵抗溶接することにより形成される。   In the manufacturing process of such a secondary battery, the two pole columns 14 and 16 respectively included in the two electrode plate groups 8 respectively accommodated in the two battery case cells 6 partitioned by the partition wall 4 are provided on the partition wall 4. When the connection portion 18 is formed by welding on the outside of the free end portion, the two pole columns 14 and 16 are combined to form the welded structure portion 28. The groove portion 26 of the welded structure portion 28 is filled with molten lead supplied by TIG welding or the like to form the connection portion 18. During this welding, a welding mask device (not shown) is attached to the welded structure portion 28. In the example of FIGS. 7 and 8, the pole columns 14 and 16 are also connected by a through weld 19 that penetrates the partition wall 4. The through-weld portion 19 is formed by resistance welding the portions of the pole column 14 and the pole column 16 located on both sides of the through-hole provided in the partition wall 4 through the through-hole.

本願明細書においては、図４に矢印Ｚで示す方向であって、仕切壁４の自由端部から接続部１８に向かう方向をＺ方向と定義する。また図１に矢印Ｘで示す方向であって、Ｚ方向と直交し且つ仕切壁４の自由端部が延びる方向をＸ方向と定義する。さらに、図１及び図４に矢印Ｙで示す方向であって、Ｚ方向及びＸ方向と直交する方向をＹ方向と定義する。   In the present specification, the direction indicated by the arrow Z in FIG. 4 and from the free end portion of the partition wall 4 toward the connecting portion 18 is defined as the Z direction. Further, the direction indicated by the arrow X in FIG. 1 and perpendicular to the Z direction and extending in the free end of the partition wall 4 is defined as the X direction. Further, a direction indicated by an arrow Y in FIGS. 1 and 4 and perpendicular to the Z direction and the X direction is defined as a Y direction.

隣り合う２つの極板群の第１の種類の極柱１４と第２の種類の極柱１６とは、溶接前に２つの第１の種類の極柱１４と第２の種類の極柱１６とが組み合わされた状態において、仕切壁４の自由端部５よりも外側の位置において直接対向する対向面１５，１７をそれぞれ有している。   The first-type pole column 14 and the second-type pole column 16 of the two adjacent electrode plate groups are the two first-type pole columns 14 and the second-type pole column 16 before welding. Are combined with each other at opposing positions 15 and 17 at positions outside the free end 5 of the partition wall 4.

図１〜４は、いずれもこの溶接前に極柱が組み合わされた状態を示す。２つの対向面１５，１７の形状は、２つの対向面１５，１７間に形成される隙間ＧをＹ方向及びＺ方向に延びる切断面に沿って切断したときの断面形状（すなわち図４に示す断面形状）が、仕切壁４側からＺ方向に延びる第１部分２０と、第１部分２０と連続し且つＹ方向に延びる第２部分２２と、第２部分２２と連続し且つＺ方向に延びる第３部分２４とからなるクランク形状になるように定められている。   1 to 4 show a state in which polar columns are combined before welding. The shape of the two facing surfaces 15 and 17 is a cross-sectional shape when the gap G formed between the two facing surfaces 15 and 17 is cut along a cutting surface extending in the Y direction and the Z direction (that is, shown in FIG. 4). The first portion 20 extending in the Z direction from the partition wall 4 side, the second portion 22 continuing from the first portion 20 and extending in the Y direction, and continuing from the second portion 22 and extending in the Z direction. It is determined to have a crank shape including the third portion 24.

このような隙間Ｇを形成するために、第１の種類の極柱１４は図５（Ａ）乃至（Ｃ）に示す構造を有しており、第２の種類の極柱１６は図６（Ａ）乃至（Ｃ）に示す構造を有している。第１の種類の極柱１４の対向面１５側の側面には、上側端面から下側に向かうに従って幅が狭くなる傾斜面１５Ａが形成されており、この傾斜面１５Ａは、上側端面の中央部の領域にのみ形成されている。傾斜面１５Ａ両側には垂直方向に延びる垂直面１５Ｂが形成されている。傾斜面１５Ａと垂直面１５Ｂの下端部からは水平方向に延びる水平面１５Ｃが形成されており、この水平面の端部からは下側に延びる垂直面１５Ｄが形成されている。この垂直面１５Ｄの下方には水平方向に延びる水平面１５Ｅが形成され、この水平面１５Ｅの下方には下方に延びる垂直面１５Ｆが形成されている。第２の種類の極柱１６の対向面１７側の側面には、上側端面から下側に向かうに従って幅が狭くなる傾斜面１７Ａが形成されており、この傾斜面１７Ａは、上側端面の中央部の領域にのみ形成されている。傾斜面１７Ａ両側には垂直方向に延びる垂直面１７Ｂが形成されている。傾斜面１７Ａと垂直面１７Ｂの下端部からは水平方向に延びる水平面１７Ｃが形成されている。この水平面の端部からは下側に延びる垂直面１７Ｄが形成されている。   In order to form such a gap G, the first type pole pole 14 has the structure shown in FIGS. 5A to 5C, and the second type pole pole 16 has the structure shown in FIG. It has the structure shown in A) to (C). On the side surface on the facing surface 15 side of the first type pole column 14, an inclined surface 15 </ b> A having a width that decreases from the upper end surface to the lower side is formed. It is formed only in the region. Vertical surfaces 15B extending in the vertical direction are formed on both sides of the inclined surface 15A. A horizontal plane 15C extending in the horizontal direction is formed from the lower ends of the inclined surface 15A and the vertical plane 15B, and a vertical plane 15D extending downward is formed from the end of the horizontal plane. A horizontal plane 15E extending in the horizontal direction is formed below the vertical plane 15D, and a vertical plane 15F extending downward is formed below the horizontal plane 15E. An inclined surface 17A having a width that decreases from the upper end surface toward the lower side is formed on the side surface on the facing surface 17 side of the second type pole pole 16, and the inclined surface 17A is a central portion of the upper end surface. It is formed only in the region. Vertical surfaces 17B extending in the vertical direction are formed on both sides of the inclined surface 17A. A horizontal surface 17C extending in the horizontal direction is formed from the lower ends of the inclined surface 17A and the vertical surface 17B. A vertical surface 17D extending downward is formed from the end of the horizontal plane.

ここで「隙間」とは、巨視的に見て接触する２つの対向面１５，１７間に形成される隙間に加えて、２つの対向面１５，１７が接触していない状態で形成される隙間を含まない。第３部分２４が含まれる隙間Ｇの領域の一部は溶接用の開先部２６を構成する。この開先は傾斜面１５Ａ及び１７Ａによって形成されている。   Here, the “gap” is a gap formed in a state where the two facing surfaces 15 and 17 are not in contact with each other, in addition to a gap formed between the two facing surfaces 15 and 17 that are in contact with each other when viewed macroscopically. Not included. A part of the region of the gap G including the third portion 24 constitutes a groove portion 26 for welding. This groove is formed by inclined surfaces 15A and 17A.

本実施の形態の二次電池及びその製造方法によれば、隙間Ｇの第３部分２４に形成した開先部２６で溶接を行うと、溶融金属は開先部２６の下方に移動し、その後Ｙ方向に延びる第２部分２２に入り込む。第２部分２２に入り込んだ溶融金属は、凝固する。仮に溶融金属が隙間の第２部分２２を越えても、隙間は第１部分２０を備えているので、溶融金属が接続部１８の下方に位置する極板群８に落下することはない。したがって、本実施の形態によれば、接続部１８の下方に溶融金属が落下するのを防止することができる。   According to the secondary battery and the manufacturing method thereof in the present embodiment, when welding is performed with the groove portion 26 formed in the third portion 24 of the gap G, the molten metal moves below the groove portion 26, and thereafter The second portion 22 extending in the Y direction enters. The molten metal that has entered the second portion 22 is solidified. Even if the molten metal exceeds the second portion 22 of the gap, since the gap includes the first portion 20, the molten metal does not fall into the electrode plate group 8 located below the connecting portion 18. Therefore, according to the present embodiment, it is possible to prevent the molten metal from dropping below the connecting portion 18.

図１によく示されているように、第３部分２４が含まれる隙間の領域のＸ方向の両端には、開先部２６は形成されていない。すなわち開先部２６は、第３部分２４のＸ方向についての中心近くにのみ形成されている。このような開先部２６が形成されていない部分を残すことにより、溶融金属がＸ方向に沿って流れ、極柱１４，１６のＸ方向についての両端から溢れ出るのを確実に防止できる。   As well shown in FIG. 1, the groove portions 26 are not formed at both ends in the X direction of the gap region including the third portion 24. That is, the groove portion 26 is formed only near the center of the third portion 24 in the X direction. By leaving such a portion where the groove portion 26 is not formed, it is possible to reliably prevent the molten metal from flowing along the X direction and overflowing from both ends of the pole columns 14 and 16 in the X direction.

本実施の形態においては、第２部分２２が含まれる隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている。これにより、溶融金属の下方への落下を確実に防止できる。   In the present embodiment, the gap size of the gap region including the second portion 22 is determined so that the molten metal can be prevented from entering due to surface tension. Thereby, the fall of a molten metal can be prevented reliably.

本実施の形態においては、第１部分２０が含まれる隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている。これにより、第２部分２２が含まれる隙間の領域の長さが短い場合でも、溶融金属の下方への落下を確実に防止できる。   In the present embodiment, the gap size of the gap area including the first portion 20 is determined so that the molten metal can be prevented from entering due to surface tension. Thereby, even when the length of the area | region of the clearance gap containing the 2nd part 22 is short, the fall of a molten metal can be prevented reliably.

溶融金属が表面張力によって侵入しないような間隙寸法の範囲は、溶融金属の種類及びそれぞれの部分に到達するときの溶融金属の温度により定まる。なお間隙寸法が十分に大きければ、溶融金属が表面張力によらずに流入することになるが、そのような大きさの間隙寸法が存在する場合には、それはもはや本発明における「隙間」とはいえない。   The range of the gap dimension in which the molten metal does not enter due to the surface tension is determined by the type of the molten metal and the temperature of the molten metal when reaching each part. If the gap dimension is sufficiently large, the molten metal flows in regardless of the surface tension. However, when such a gap dimension exists, it is no longer a “gap” in the present invention. I can't say that.

開先部の形状は任意であるが、本実施の形態においては、図１における開先部２６の断面形状は、Ｚ方向と逆方向に向かうに従って幅が狭まるＶ字形である。このようなＶ字形の開先形状であれば、溶融金属の多くが開先部に溜まることになり、第２部分２２が含まれる隙間の領域に入り込む溶融金属の量を少なくすることができる。   Although the shape of the groove portion is arbitrary, in the present embodiment, the cross-sectional shape of the groove portion 26 in FIG. 1 is a V shape whose width becomes narrower in the direction opposite to the Z direction. With such a V-shaped groove shape, most of the molten metal accumulates in the groove portion, and the amount of molten metal that enters the gap region including the second portion 22 can be reduced.

接続部１８の溶接方法は限定されないが、本実施の形態においてはＴＩＧ溶接により実施される。   Although the welding method of the connection part 18 is not limited, In this Embodiment, it implements by TIG welding.

２つの極柱の対向面の断面形状が、仕切壁部側からＺ方向に延びる第１の部分と、Ｙ方向に延びる第２の部分と、Ｚ方向に延びる第３の部分とからなるクランク形状になる隙間の第３の部分に形成した開先部で溶接を行うと、溶融金属は開先部の下方に移動し、その後Ｙ方向に延びる第２の部分に入り込む。第２の部分に入り込んだ溶融金属は、凝固する。仮に溶融金属が隙間の第２の部分を越えても、隙間は第１の部分を備えているので、溶融金属が接続部の下方に位置する極板群に落下することはない。   The cross-sectional shape of the opposing surfaces of the two pole poles is a crank shape comprising a first part extending in the Z direction from the partition wall side, a second part extending in the Y direction, and a third part extending in the Z direction. When welding is performed at the groove portion formed in the third portion of the gap, the molten metal moves below the groove portion and then enters the second portion extending in the Y direction. The molten metal that has entered the second part solidifies. Even if the molten metal exceeds the second portion of the gap, since the gap includes the first portion, the molten metal does not fall into the electrode plate group located below the connecting portion.

２ 電槽本体
４ 仕切壁
６ 電槽セル
８ 極板群
１０ 負極板
１２ セパレータ
１４ 第１の種類の極柱
１６ 第２の種類の極柱
１８ 接続部
２０ 第１部分
２２ 第２部分
２４ 第３部分
２６ 開先部 2 Battery Case Body 4 Partition Wall 6 Battery Case Cell 8 Electrode Plate Group 10 Negative Electrode Plate 12 Separator 14 First Type Polar Column 16 Second Type Polar Column 18 Connection Portion 20 First Part 22 Second Part 24 Third Part 26 Groove

Claims (10)

仕切壁部によって仕切られた少なくとも２つの電槽セルを有する電槽本体と、それぞれ極柱を備えて前記少なくとも２つの電槽セルに収納された少なくとも２つの極板群と、前記２つの極板群の２つの極柱どうしが前記仕切壁部の自由端部の外側で溶接されて形成された接続部とを備えている二次電池であって、
前記仕切壁部の前記自由端部から前記接続部に向かう方向をＺ方向と定義し、前記Ｚ方向と直交し且つ前記仕切壁部の前記自由端部が延びる方向をＸ方向と定義し、前記Ｚ方向及び前記Ｘ方向と直交する方向をＹ方向と定義したときに、
前記２つの極板群の前記２つの極柱は、溶接前に前記２つの極柱が組み合わされた状態において、前記仕切壁部の前記自由端部よりも外側の位置において直接対向する対向面をそれぞれ有しており、
２つの前記対向面の形状は、前記２つの対向面間に形成される隙間を前記Ｙ方向及びＺ方向に延びる切断面に沿って切断したときの断面形状が、前記仕切壁部側から前記Ｚ方向に延びる第１の部分と、該第１の部分と連続し且つ前記Ｙ方向に延びる第２の部分と、該第２の部分と連続し且つ前記Ｚ方向に延びる第３の部分とからなるクランク形状になるように定められており、
前記第３の部分が含まれる前記隙間の領域の一部が溶接用の開先部を構成していることを特徴とする二次電池。 A battery case main body having at least two battery case cells partitioned by a partition wall, at least two electrode plate groups each having a pole column and housed in the at least two battery case cells, and the two electrode plates A secondary battery comprising: a connecting portion formed by welding two pole columns of a group outside the free end of the partition wall;
A direction from the free end portion of the partition wall portion toward the connection portion is defined as a Z direction, a direction orthogonal to the Z direction and the free end portion of the partition wall portion is defined as an X direction, When the direction perpendicular to the Z direction and the X direction is defined as the Y direction,
The two pole columns of the two electrode plate groups have opposing surfaces that directly face each other at a position outside the free end portion of the partition wall portion in a state where the two pole columns are combined before welding. Each has
The shape of the two facing surfaces is such that a cross-sectional shape when a gap formed between the two facing surfaces is cut along a cutting surface extending in the Y direction and the Z direction is from the partition wall side to the Z A first portion extending in the direction, a second portion continuing to the first portion and extending in the Y direction, and a third portion continuing to the second portion and extending in the Z direction. It is determined to be a crank shape,
A secondary battery, wherein a part of the gap region including the third portion constitutes a groove portion for welding. 前記第３の部分が含まれる前記隙間の領域の前記Ｘ方向の両端には前記開先部が形成されていないことを特徴とする請求項１に記載の二次電池。   The secondary battery according to claim 1, wherein the groove portion is not formed at both ends in the X direction of the gap region including the third portion. 前記第２の部分が含まれる前記隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている請求項１または２に記載の二次電池。   3. The secondary battery according to claim 1, wherein a gap size of the gap area including the second portion is determined so that molten metal can be prevented from entering due to surface tension. 前記第１の部分が含まれる前記隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている請求項３に記載の二次電池。   The secondary battery according to claim 3, wherein a gap size of the gap area including the first portion is determined so as to prevent the molten metal from entering due to surface tension. 前記開先部は、前記Ｚ方向と逆方向に向かうに従って幅が狭まるＶ字形の開先形状である請求項１に記載の二次電池。   The secondary battery according to claim 1, wherein the groove portion has a V-shaped groove shape whose width is narrowed in a direction opposite to the Z direction. 仕切壁部によって仕切られた少なくとも２つの電槽セルを有する電槽本体と、それぞれ極柱を備えて前記少なくとも２つの電槽セルに収納された少なくとも２つの極板群と、前記２つの極板群の２つの極柱どうしを前記仕切壁部の自由端部の外側で溶接して接続部を形成する二次電池の製造方法であって、
前記仕切壁部の前記自由端部から前記接続部に向かう方向をＺ方向と定義し、前記Ｚ方向と直交し且つ前記仕切壁部の前記自由端部が延びる方向をＸ方向と定義し、前記Ｚ方向及び前記Ｘ方向と直交する方向をＹ方向と定義したときに、
前記２つの極板群の前記２つの極柱は、溶接前に前記２つの極柱が組み合わされた状態において、前記仕切壁部の前記自由端部よりも外側の位置において直接対向する対向面をそれぞれ有しており、
２つの前記対向面の形状は、前記２つの対向面間に形成される隙間を前記Ｙ方向及びＺ方向に延びる切断面により沿って切断したときの断面形状が、前記仕切壁部側から前記Ｚ方向に延びる第１の部分と、該第１の部分と連続し且つ前記Ｙ方向に延びる第２の部分と、該第２の部分と連続し且つ前記Ｚ方向に延びる第３の部分とからなるクランク形状になるように定められており、
前記第３の部分が含まれる前記隙間の領域の一部に溶接用の開先部を構成し、前記開先部に沿って前記溶接をすることを特徴とする二次電池の製造方法。 A battery case main body having at least two battery case cells partitioned by a partition wall, at least two electrode plate groups each having a pole column and housed in the at least two battery case cells, and the two electrode plates A method of manufacturing a secondary battery in which two electrode poles of a group are welded outside a free end portion of the partition wall portion to form a connection portion,
A direction from the free end portion of the partition wall portion toward the connection portion is defined as a Z direction, a direction orthogonal to the Z direction and the free end portion of the partition wall portion is defined as an X direction, When the direction perpendicular to the Z direction and the X direction is defined as the Y direction,
The two pole columns of the two electrode plate groups have opposing surfaces that directly face each other at a position outside the free end portion of the partition wall portion in a state where the two pole columns are combined before welding. Each has
The shape of the two facing surfaces is such that the cross-sectional shape when the gap formed between the two facing surfaces is cut along a cutting surface extending in the Y direction and the Z direction is from the partition wall side to the Z A first portion extending in the direction, a second portion continuing to the first portion and extending in the Y direction, and a third portion continuing to the second portion and extending in the Z direction. It is determined to be a crank shape,
A manufacturing method of a secondary battery, wherein a groove portion for welding is formed in a part of the gap region including the third portion, and the welding is performed along the groove portion. 前記第３の部分が含まれる前記隙間の領域の前記Ｘ方向の両端には前記開先部が形成されていないことを特徴とする請求項６に記載の二次電池の製造方法。   The method of manufacturing a secondary battery according to claim 6, wherein the groove portion is not formed at both ends in the X direction of the gap region including the third portion. 前記第２の部分が含まれる前記隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている請求項６または７に記載の二次電池の製造方法。   8. The method for manufacturing a secondary battery according to claim 6, wherein a gap dimension of the gap area including the second portion is determined so that molten metal can be prevented from entering due to surface tension. 9. 前記第１の部分が含まれる前記隙間の領域の間隙寸法は、溶融金属が表面張力によって浸入することを阻止できるように定められている請求項８に記載の二次電池の製造方法。   The method for manufacturing a secondary battery according to claim 8, wherein a gap dimension of the gap area including the first portion is determined so that molten metal can be prevented from entering due to surface tension. 前記開先部は、前記Ｚ方向と逆方向に向かうに従って幅が狭まるＶ字形の開先形状である請求項６に記載の二次電池の製造方法。   The method for manufacturing a secondary battery according to claim 6, wherein the groove portion has a V-shaped groove shape whose width decreases in a direction opposite to the Z direction.
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