JP2020167095A - Lead-acid battery - Google Patents

Lead-acid battery Download PDF

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JP2020167095A
JP2020167095A JP2019068345A JP2019068345A JP2020167095A JP 2020167095 A JP2020167095 A JP 2020167095A JP 2019068345 A JP2019068345 A JP 2019068345A JP 2019068345 A JP2019068345 A JP 2019068345A JP 2020167095 A JP2020167095 A JP 2020167095A
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positive electrode
intermediate pole
strap
lead
pole column
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亮 田井中
Akira Tainaka
亮 田井中
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Furukawa Battery Co Ltd
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Furukawa Battery Co Ltd
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Priority to JP2019068345A priority Critical patent/JP2020167095A/en
Priority to CN202020161362.XU priority patent/CN211320203U/en
Publication of JP2020167095A publication Critical patent/JP2020167095A/en
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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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

To provide a lead-acid battery capable of preventing liquid leakage.SOLUTION: A lead-acid battery comprises a connection body which connects a first electrode plate disposed in an arbitrary first cell chamber to a second electrode plate disposed in a second cell chamber adjacent to the first cell chamber across a partition wall. The connection body has: a hole interior connection part which is disposed inside a through-hole provided on the partition wall; and a hole exterior connection part which is disposed outside the through-hole. The hole exterior connection part has a fragile portion which is located lower than the hole interior connection part.SELECTED DRAWING: Figure 1

Description

本発明は、鉛蓄電池に関する。 The present invention relates to a lead storage battery.

鉛蓄電池、特に始動用鉛蓄電池は、正極板と負極板及びセパレータで構成された極板群が、電槽内の隔壁（中仕切り）によって区画されたセル室内に収納され、隣接するセル室間で極板群同士が中間極柱を介して接続された構造が一般的である（例えば、特許文献１を参照）。隣り合うセル室間で隣り合う一対の中間極柱は、隔壁に設けられた貫通孔を通して、抵抗溶接によって互いに接続される。 In lead-acid batteries, especially lead-acid batteries for starting, a group of electrode plates composed of a positive electrode plate, a negative electrode plate, and a separator is housed in a cell chamber partitioned by a partition (partition) in the battery case, and between adjacent cell chambers. In general, a group of electrode plates is connected to each other via an intermediate electrode column (see, for example, Patent Document 1). A pair of intermediate pole columns adjacent to each other between adjacent cell chambers are connected to each other by resistance welding through through holes provided in the partition wall.

特許第５０３４５４３号公報Japanese Patent No. 5034543

中間極柱の抵抗溶接部に隔壁との密着性が低い部分があると、隣接するセル室間で気密性や液密性が損なわれる可能性がある。また、ポリプロピレン製の電槽は、鉛蓄電池を高温雰囲気で使用した場合に、隔壁にたわみが発生し易く、隔壁と抵抗溶接部との密着性が低下して隙間が発生し易い。この隙間を通して、一方のセル室内の電解液が隣り合う他方のセル室内に移動する現象（以下、液リークともいう）が発生する。液リークによって、一方のセル室の正極板と他方のセル室の負極板とがセルを構成すると、これら極板間でリーク電流が発生する。このリーク電流により、鉛蓄電池の内部抵抗が上昇し、電圧が低下する可能性がある。この液リークを解消するための方法として、特許文献１には、隔壁に改良を施すことが開示されている。 If the resistance welded portion of the intermediate pole column has a portion having low adhesion to the partition wall, the airtightness and liquidtightness between adjacent cell chambers may be impaired. Further, in the polypropylene battery case, when the lead storage battery is used in a high temperature atmosphere, the partition wall tends to be bent, the adhesion between the partition wall and the resistance welded portion is lowered, and a gap is likely to be generated. Through this gap, a phenomenon occurs in which the electrolytic solution in one cell chamber moves into the adjacent cell chamber (hereinafter, also referred to as liquid leak). When the positive electrode plate of one cell chamber and the negative electrode plate of the other cell chamber form a cell due to liquid leakage, a leak current is generated between these electrode plates. Due to this leakage current, the internal resistance of the lead-acid battery may increase and the voltage may decrease. As a method for eliminating this liquid leak, Patent Document 1 discloses that the partition wall is improved.

しかしながら、本発明者は、特許文献１に記載された隔壁のたわみとは異なる現象により、液リークが発生する可能性があることがわかった。
詳しく説明すると、鉛蓄電池を車両に搭載する際には、走行中に鉛蓄電池が振動することを抑制するために、蓋の上にステーと呼ばれる固定金具を載せて、その長さ方向両端のボルトを締め付けることにより、鉛蓄電池を車両に押さえつける。この締め付けは適切な力で行う必要がある。締め付け力が強過ぎると、電槽の外装や隔壁が弓状に変形するおそれがある。また、腐食による格子の伸び（グロース）により、正極板を支持する正極ストラップ及び正極中間極柱に反りが生じるおそれがある。これらの要因が重なると、中間極柱の抵抗溶接部と隔壁との間に隙間が生じる可能性があることがわかった。この隙間を通して液リークが発生する可能性がある。 However, the present inventor has found that a liquid leak may occur due to a phenomenon different from the deflection of the partition wall described in Patent Document 1.
To explain in detail, when mounting a lead-acid battery in a vehicle, in order to prevent the lead-acid battery from vibrating while driving, a fixing bracket called a stay is placed on the lid, and bolts at both ends in the length direction are placed. Press the lead-acid battery against the vehicle by tightening. This tightening must be done with an appropriate force. If the tightening force is too strong, the exterior of the battery case and the partition wall may be deformed in a bow shape. In addition, the growth of the lattice due to corrosion may cause warpage of the positive electrode strap and the positive electrode intermediate pole column that support the positive electrode plate. It was found that when these factors are combined, a gap may be formed between the resistance welded portion of the intermediate pole column and the partition wall. Liquid leakage may occur through this gap.

本発明は上記課題に着目してなされたものであって、液リークの発生を抑制可能な鉛蓄電池を提供することを目的とする。 The present invention has been made with attention to the above problems, and an object of the present invention is to provide a lead storage battery capable of suppressing the occurrence of liquid leakage.

上記課題を解決するために、本発明の一態様に係る鉛蓄電池は、任意の第１のセル室に配置される第１の極板を前記第１のセル室と隔壁を介して隣り合う第２のセル室に配置される第２の極板に接続する接続体、を備え、前記接続体は、前記隔壁に設けられた貫通孔内に配置される孔内接続部と、前記貫通孔の外側に配置される孔外接続部と、を有し、前記孔外接続部は、前記孔内接続部よりも下側に脆弱部を有する。 In order to solve the above problems, in the lead storage battery according to one aspect of the present invention, a first electrode plate arranged in an arbitrary first cell chamber is adjacent to the first cell chamber via a partition wall. A connecting body connecting to a second electrode plate arranged in the cell chamber of 2 is provided, and the connecting body includes an in-hole connecting portion arranged in a through hole provided in the partition wall and the through hole. It has an outer hole connection portion arranged on the outside, and the outer hole connection portion has a fragile portion below the inner hole connection portion.

本発明によれば、液リークの発生を抑制可能な鉛蓄電池を提供することができる。 According to the present invention, it is possible to provide a lead storage battery capable of suppressing the occurrence of liquid leakage.

図１は、本発明の第１実施形態に係る鉛蓄電池の構成例を示す断面図である。FIG. 1 is a cross-sectional view showing a configuration example of a lead storage battery according to the first embodiment of the present invention. 図２は、本発明の第１実施形態に係る正極接続体の構成例を示す側面図である。FIG. 2 is a side view showing a configuration example of the positive electrode connector according to the first embodiment of the present invention. 図３は、本発明の第１実施形態に係る正極接続体の塑性変形の例を示す図である。FIG. 3 is a diagram showing an example of plastic deformation of the positive electrode connector according to the first embodiment of the present invention. 図４は、本発明の第１実施形態に係る正極接続体の変形例１を示す断面図である。FIG. 4 is a cross-sectional view showing a modification 1 of the positive electrode connector according to the first embodiment of the present invention. 図５は、本発明の第１実施形態に係る正極接続体の変形例２を示す側面図である。FIG. 5 is a side view showing a modification 2 of the positive electrode connector according to the first embodiment of the present invention. 図６は、本発明の第１実施形態に係る正極接続体の変形例３を示す側面図である。FIG. 6 is a side view showing a modified example 3 of the positive electrode connector according to the first embodiment of the present invention. 図７は、本発明の第１実施形態に係る正極接続体の変形例４を示す側面図である。FIG. 7 is a side view showing a modified example 4 of the positive electrode connector according to the first embodiment of the present invention. 図８は、本発明の第１実施形態に係る正極接続体の変形例５を示す断面図である。FIG. 8 is a cross-sectional view showing a modified example 5 of the positive electrode connector according to the first embodiment of the present invention. 図９は、本発明の第１実施形態に係る正極接続体の変形例６を示す断面図である。FIG. 9 is a cross-sectional view showing a modified example 6 of the positive electrode connector according to the first embodiment of the present invention. 図１０は、本発明の第２実施形態に係る鉛蓄電池の構成例を示す断面図である。FIG. 10 is a cross-sectional view showing a configuration example of the lead storage battery according to the second embodiment of the present invention. 図１１は、本発明の第２実施形態に係る正極接続体の塑性変形の例を示す図である。FIG. 11 is a diagram showing an example of plastic deformation of the positive electrode connector according to the second embodiment of the present invention. 図１２は、本発明の第３実施形態に係る鉛蓄電池の構成例を示す断面図である。FIG. 12 is a cross-sectional view showing a configuration example of the lead storage battery according to the third embodiment of the present invention. 図１３は、本発明の第４実施形態に係る鉛蓄電池の構成例を示す断面図である。FIG. 13 is a cross-sectional view showing a configuration example of the lead storage battery according to the fourth embodiment of the present invention. 図１４は、本発明の第４実施形態に係る正極接続体の構成例を示す側面図である。FIG. 14 is a side view showing a configuration example of the positive electrode connector according to the fourth embodiment of the present invention. 図１５は、本発明の第４実施形態に係る正極接続体の塑性変形の例を示す図である。FIG. 15 is a diagram showing an example of plastic deformation of the positive electrode connector according to the fourth embodiment of the present invention. 図１６は、本発明の第４実施形態に係る正極接続体の変形例を示す断面図である。FIG. 16 is a cross-sectional view showing a modified example of the positive electrode connector according to the fourth embodiment of the present invention. 図１７は、本発明の第５実施形態に係る鉛蓄電池の構成例を示す断面図である。FIG. 17 is a cross-sectional view showing a configuration example of a lead storage battery according to a fifth embodiment of the present invention. 図１８は、本発明の第５実施形態に係る正極接続体の構成例を示す側面図である。FIG. 18 is a side view showing a configuration example of the positive electrode connector according to the fifth embodiment of the present invention. 図１９は、本発明の第５実施形態に係る正極接続体の塑性変形の例を示す図である。FIG. 19 is a diagram showing an example of plastic deformation of the positive electrode connector according to the fifth embodiment of the present invention. 図２０は、本発明の第５実施形態に係る正極接続体の変形例を示す断面図である。FIG. 20 is a cross-sectional view showing a modified example of the positive electrode connector according to the fifth embodiment of the present invention.

＜実施形態＞
本発明の実施形態について説明する。なお、以下に説明する実施形態は本発明の一例を示したものであって、本発明は実施形態に限定されるものではない。また、実施形態には種々の変更又は改良を加えることが可能であり、そのような変更又は改良を加えた形態も本発明に含まれ得る。 <Embodiment>
An embodiment of the present invention will be described. The embodiments described below are examples of the present invention, and the present invention is not limited to the embodiments. In addition, various changes or improvements can be added to the embodiments, and the modified or improved embodiments may be included in the present invention.

以下の図面の記載において、同一又は類似の部分には同一又は類似の符号を付している。但し、図面は模式的なものであり、厚みと平面寸法との関係、各装置や各部材の厚みの比率等は現実のものとは異なることに留意すべきである。したがって、具体的な厚みや寸法は以下の説明を参酌して判定すべきものである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれることは勿論である。 In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimension, the ratio of the thickness of each device and each member, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

以下の図面の記載では、Ｘ軸方向、Ｙ軸方向及びＺ軸方向を用いて、方向を示す場合がある。例えば、Ｘ軸方向は、後述する中間極柱１２の厚み方向である。Ｙ軸方向は、後述する中間極柱１２の幅方向である。Ｚ軸方向は、後述する中間極柱１２の長手方向である。Ｘ軸方向、Ｙ軸方向及びＺ軸方向は、互いに直交する。ＸＹＺ軸は右手系をなす。 In the following drawings, the X-axis direction, the Y-axis direction, and the Z-axis direction may be used to indicate the direction. For example, the X-axis direction is the thickness direction of the intermediate pole column 12 described later. The Y-axis direction is the width direction of the intermediate pole column 12 described later. The Z-axis direction is the longitudinal direction of the intermediate pole column 12, which will be described later. The X-axis direction, the Y-axis direction, and the Z-axis direction are orthogonal to each other. The XYZ axes form a right-handed system.

〔全体構成の説明〕
本発明の実施形態に係る鉛蓄電池は、従来公知のモノブロックタイプの電槽と、蓋と、６個の極板群とを有する。電槽は、隔壁により６個のセル室に区画されている。６個のセル室は電槽の長手方向に沿って配列されている。各セル室に１個の極板群が収納されている。各極板群は、複数枚の正・負極板と、これら正・負極板を隔離するセパレータと、同極性の極板の耳群を接続したストラップと、ストラップから立ち上がる中間極柱とを有する。 [Explanation of overall configuration]
The lead-acid battery according to the embodiment of the present invention has a conventionally known monoblock type battery case, a lid, and a group of six plates. The battery case is divided into 6 cell chambers by a partition wall. The six cell chambers are arranged along the longitudinal direction of the battery case. One electrode plate group is stored in each cell chamber. Each electrode plate group has a plurality of positive and negative electrode plates, a separator that separates the positive and negative electrode plates, a strap that connects the ear groups of the electrode plates of the same polarity, and an intermediate pole pillar that rises from the strap.

正極板は、正極活物質を含む合剤が保持された正極基板と、正極基板から上側に突出する耳とを有する。負極板は、負極活物質を含む合剤が保持された負極基板と、負極基板から上側に突出する耳とを有する。複数枚の正極板及び負極板は、セパレータを介して交互に配置されている。極板群を構成する負極板の枚数Ｍｎは正極板の枚数Ｍｐよりも１枚多い。なお、正極板の枚数Ｍｐの方が負極板の枚数Ｍｎよりも１枚多くても良いし、負極板の枚数Ｍｎと正極板の枚数Ｍｐとは同枚数でも良い。
負極板は袋状セパレータ内に収納されている。そして、負極板が入った袋状セパレータと正極板とを交互に重ねることで、負極板と正極板との間にセパレータが配置された状態となっている。なお、正極板を袋状セパレータに収納して、負極板と交互に重ねても良い。 The positive electrode plate has a positive electrode substrate on which a mixture containing a positive electrode active material is held, and an ear protruding upward from the positive electrode substrate. The negative electrode plate has a negative electrode substrate on which a mixture containing a negative electrode active material is held, and an ear protruding upward from the negative electrode substrate. A plurality of positive electrode plates and negative electrode plates are alternately arranged via a separator. The number M n of the negative electrode plates constituting the electrode plate group is one more than the number M p of the positive electrode plates. Incidentally, the direction of the number M p of the positive electrode plate may be one than many number M n of the negative electrode plate, may be the same number of sheets and the number M p of the number M n and the positive electrode plate of the negative electrode plate.
The negative electrode plate is housed in a bag-shaped separator. Then, by alternately stacking the bag-shaped separator containing the negative electrode plate and the positive electrode plate, the separator is arranged between the negative electrode plate and the positive electrode plate. The positive electrode plate may be stored in the bag-shaped separator and alternately stacked with the negative electrode plate.

＜第１実施形態＞
図１は、本発明の第１実施形態に係る鉛蓄電池１００の構成例を示す断面図である。図２は、本発明の第１実施形態に係る正極接続体１１０Ａの構成例を示す側面図である。図１の断面図は、図２の側面図をＸ−Ｚ面で切断した断面に対応している。Ｘ−Ｚ面とは、Ｘ軸方向及びＺ軸方向に平行な面である。図１に示すように、第１実施形態に係る鉛蓄電池１００は、隔壁３を介して区画された６個のセル室１−１、１−２、…１−６（セル室１−１〜１−６は図示せず）を有する。セル室１−１〜１−６には、それぞれ、複数の正極板４Ａと、複数の正極板４Ａの各耳を支持する正極ストラップ１１Ａと、複数の負極板４Ｂと、複数の負極板４Ｂの各耳を支持する負極ストラップ１１Ｂとが配置されている。また、セル室１−１には、正極ストラップ１１Ａに接続する正極中間極柱１２Ａが配置されている。正極ストラップ１１Ａ及び正極中間極柱１２Ａは、鉛又は鉛合金で構成されている。正極ストラップ１１Ａ及び正極中間極柱１２Ａは、鋳型を用いて一体成型されており、１つの部品として正極接続体１１０Ａを構成している。 <First Embodiment>
FIG. 1 is a cross-sectional view showing a configuration example of the lead storage battery 100 according to the first embodiment of the present invention. FIG. 2 is a side view showing a configuration example of the positive electrode connector 110A according to the first embodiment of the present invention. The cross-sectional view of FIG. 1 corresponds to a cross section of the side view of FIG. 2 cut along the XX plane. The XZ plane is a plane parallel to the X-axis direction and the Z-axis direction. As shown in FIG. 1, the lead-acid battery 100 according to the first embodiment has six cell chambers 1-1, 1-2, ... 1-6 (cell chambers 1-1 to 1 to 1) partitioned via a partition wall 3. 1-6 is not shown). In the cell chambers 1-1 to 1-6, a plurality of positive electrode plates 4A, a positive electrode strap 11A supporting each ear of the plurality of positive electrode plates 4A, a plurality of negative electrode plates 4B, and a plurality of negative electrode plates 4B, respectively. A negative electrode strap 11B that supports each ear is arranged. Further, in the cell chamber 1-1, a positive electrode intermediate pole column 12A connected to the positive electrode strap 11A is arranged. The positive electrode strap 11A and the positive electrode intermediate pole column 12A are made of lead or a lead alloy. The positive electrode strap 11A and the positive electrode intermediate pole column 12A are integrally molded using a mold, and constitute the positive electrode connector 110A as one component.

セル室１−１に隣接するセル室１−２には、負極ストラップ１１Ｂに接続する負極中間極柱１２Ｂが配置されている。負極ストラップ１１Ｂ及び負極中間極柱１２Ｂは、鉛又は鉛合金で構成されている。負極ストラップ１１Ｂ及び負極中間極柱１２Ｂは、鋳型を用いて一体成型されており、１つの部品として負極接続体１１０Ｂを構成している。正極接続体１１０Ａと、負極接続体１１０Ｂとは、互いに同一の形状で、且つ、互いに同一の大きさを有する。なお、正極接続体１１０Ａと負極接続体１１０Ｂは、互いに異なる形状を有しても良いし、互いに異なる大きさを有しても良い。 In the cell chamber 1-2 adjacent to the cell chamber 1-1, a negative electrode intermediate pole column 12B connected to the negative electrode strap 11B is arranged. The negative electrode strap 11B and the negative electrode intermediate pole column 12B are made of lead or a lead alloy. The negative electrode strap 11B and the negative electrode intermediate pole column 12B are integrally molded using a mold, and the negative electrode connecting body 110B is formed as one component. The positive electrode connector 110A and the negative electrode connector 110B have the same shape and the same size as each other. The positive electrode connector 110A and the negative electrode connector 110B may have different shapes or different sizes.

セル室１−１に配置された正極中間極柱１２Ａと、セル室１−２に配置された負極中間極柱１２Ｂとは、隔壁３を介して互いに隣り合い、且つ、セル室１−１とセル室１−２との間の隔壁３に設けられた貫通孔３Ｈを通して互いに接続されている。例えば、セル室１−１に配置された正極中間極柱１２Ａとセル室１−２に配置された負極中間極柱１２Ｂとは、貫通孔３Ｈを通して抵抗溶接されている。貫通孔３Ｈ内には、正極中間極柱１２Ａと負極中間極柱１２Ｂとが抵抗溶接されることにより、孔内接続部（以下、抵抗溶接部という）１２３が形成されている。 The positive electrode intermediate pole pillar 12A arranged in the cell chamber 1-1 and the negative electrode intermediate pole pillar 12B arranged in the cell chamber 1-2 are adjacent to each other via the partition wall 3 and are adjacent to each other with the cell chamber 1-1. They are connected to each other through a through hole 3H provided in the partition wall 3 between the cell chambers 1-2. For example, the positive electrode intermediate pole column 12A arranged in the cell chamber 1-1 and the negative electrode intermediate pole column 12B arranged in the cell chamber 1-2 are resistance welded through the through hole 3H. In the through hole 3H, the positive electrode intermediate pole column 12A and the negative electrode intermediate pole column 12B are resistance welded to form an in-hole connection portion (hereinafter referred to as a resistance welded portion) 123.

以下の説明では、セル室１−１〜１−６を区別して説明する必要がない場合は、これらをセル室１と総称する。
正極ストラップ１１Ａの長手方向（例えば、Ｘ軸方向）の一端に、正極中間極柱１２Ａが接続している。正極中間極柱１２Ａは、正極ストラップ１１Ａよりも隔壁３に近い側に位置し、且つ、隔壁３に沿って配置されている。正極中間極柱１２Ａは、おもて面１２ａと、おもて面の反対側に位置するうら面１２ｂとを有する。うら面１２ｂが、隔壁３と向かい合っている。 In the following description, when it is not necessary to distinguish between cell chambers 1-1 to 1-6, these are collectively referred to as cell chamber 1.
A positive electrode intermediate pole column 12A is connected to one end of the positive electrode strap 11A in the longitudinal direction (for example, the X-axis direction). The positive electrode intermediate pole column 12A is located closer to the partition wall 3 than the positive electrode strap 11A, and is arranged along the partition wall 3. The positive electrode intermediate pole column 12A has a front surface 12a and a back surface 12b located on the opposite side of the front surface. The back surface 12b faces the partition wall 3.

図１及び図２に示すように、正極中間極柱１２Ａには、抵抗溶接部１２３と正極ストラップ１１Ａとの間の位置に凹部１２５が設けられている。凹部１２５は、正極中間極柱１２Ａのおもて面１２ａ側に設けられている。凹部１２５の形状は、例えば三角形の切り欠きである。 As shown in FIGS. 1 and 2, the positive electrode intermediate pole column 12A is provided with a recess 125 at a position between the resistance welded portion 123 and the positive electrode strap 11A. The recess 125 is provided on the front surface 12a side of the positive electrode intermediate pole column 12A. The shape of the recess 125 is, for example, a triangular notch.

図３は、本発明の第１実施形態に係る正極接続体１１０Ａの塑性変形の例を示す図である。図３に示すように、鉛蓄電池１００において、正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらくと、正極ストラップ１１Ａは上方向に押圧される。力Ｆは、腐食による格子伸び（以下、グロースという）により正極板４Ａが電槽の底部に接触することにより発生する。上方向とは、鉛蓄電池１００の蓋体（図示せず）に近づく方向であり、例えばＺ軸の正方向である。抵抗溶接部１２３は貫通孔３Ｈ内の内周面に接しているため、正極中間極柱１２Ａは上方向への移動が制限されている。このため、正極ストラップ１１Ａが上方向に押圧されると、正極中間極柱１２Ａには曲げやねじりの力がはたらく。 FIG. 3 is a diagram showing an example of plastic deformation of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 3, in the lead-acid battery 100, when a force F acts on the positive electrode strap 11A from the positive electrode plate 4A, the positive electrode strap 11A is pressed upward. The force F is generated when the positive electrode plate 4A comes into contact with the bottom of the battery case due to lattice elongation (hereinafter referred to as growth) due to corrosion. The upward direction is a direction approaching the lid (not shown) of the lead-acid battery 100, for example, a positive direction of the Z axis. Since the resistance welded portion 123 is in contact with the inner peripheral surface in the through hole 3H, the movement of the positive electrode intermediate pole column 12A in the upward direction is restricted. Therefore, when the positive electrode strap 11A is pressed upward, a bending or twisting force acts on the positive electrode intermediate pole column 12A.

正極中間極柱１２Ａにおいて、凹部１２５の近傍に位置する部位（例えば、凹部１２５の底面を構成する部位（以下、底部という）１２６）は、正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆに対する剛性が低い脆弱部となっている。剛性とは、曲げやねじりの力に対する変形のしづらさの度合いを意味する。正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆが所定の大きさ以上の場合、図３に示すように、剛性が低い底部１２６が変形する。正極中間極柱１２Ａにおいて、底部１２６は、底部１２６の周囲に位置する他の部位よりも厚みが薄く、剛性が低い。 In the positive electrode intermediate pole column 12A, the portion located in the vicinity of the recess 125 (for example, the portion constituting the bottom surface of the recess 125 (hereinafter referred to as the bottom) 126) has rigidity against the force F acting from the positive electrode plate 4A to the positive electrode strap 11A. It is a low vulnerable part. Rigidity means the degree of difficulty in deformation with respect to bending and twisting forces. When the force F acting from the positive electrode plate 4A to the positive electrode strap 11A is equal to or greater than a predetermined magnitude, the bottom portion 126 having low rigidity is deformed as shown in FIG. In the positive electrode intermediate pole column 12A, the bottom portion 126 is thinner and has lower rigidity than other portions located around the bottom portion 126.

力Ｆに対して、抵抗溶接部１２３よりも底部１２６が優先的に塑性変形し、凹部１２５よりも下側（すなわち、正極ストラップ１１Ａ側）に位置する部位が上方向へ屈曲する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。 With respect to the force F, the bottom portion 126 is preferentially plastically deformed over the resistance welded portion 123, and the portion located below the recess 125 (that is, the positive electrode strap 11A side) is bent upward. As a result, even when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is created between the resistance welded portion 123 and the through hole 3H. It can be prevented from occurring.

以上説明したように、本発明の第１実施形態に係る鉛蓄電池１００は、任意の第１のセル室（例えば、セル室１−１）に配置される第１の極板（例えば、正極板４Ａ）をセル室１−１と隔壁３を介して隣り合う第２のセル室（例えば、セル室１−２）に配置される第２の極板（例えば、負極板４Ｂ）に接続する接続体、を備える。接続体は、隔壁３に設けられた貫通孔３Ｈ内に配置される孔内接続部（例えば、抵抗溶接部１２３）と、貫通孔３Ｈの外側に配置される孔外接続部（例えば、正極接続体１１０Ａ）を有する。正極接続体１１０Ａは、抵抗溶接部１２３よりも下側に脆弱部を有する。例えば、下側とは、正極ストラップ１１Ａの下面１１ａに近い側であり、換言すると、電槽底部に近い側である。 As described above, the lead-acid battery 100 according to the first embodiment of the present invention has a first electrode plate (for example, a positive electrode plate) arranged in an arbitrary first cell chamber (for example, cell chamber 1-1). Connection for connecting 4A) to a second electrode plate (for example, negative electrode plate 4B) arranged in a second cell chamber (for example, cell chamber 1-2) adjacent to each other via the cell chamber 1-1 and the partition wall 3. Equipped with a body. The connecting body includes an intra-hole connection portion (for example, a resistance welded portion 123) arranged in the through hole 3H provided in the partition wall 3 and an extra-hole connection portion (for example, a positive electrode connection) arranged outside the through hole 3H. It has a body 110A). The positive electrode connector 110A has a fragile portion below the resistance welded portion 123. For example, the lower side is the side closer to the lower surface 11a of the positive electrode strap 11A, in other words, the side closer to the bottom of the battery case.

正極接続体１１０Ａは、正極板４Ａを支持するストラップ（例えば、正極ストラップ１１Ａ）と、正極ストラップ１１Ａと抵抗溶接部１２３とを接続する中間極柱（例えば、正極中間極柱１２Ａ）とを有する。抵抗溶接部１２３は、正極中間極柱１２Ａにおいて隔壁３と向かい合う面（例えば、うら面１２ｂ）から貫通孔３Ｈ内へ延設されている。
正極中間極柱１２Ａは、抵抗溶接部１２３と正極ストラップ１１Ａとの間の位置に凹部１２５を有する。正極中間極柱１２Ａにおいて凹部１２５の近傍に位置する部位が脆弱部である。 The positive electrode connecting body 110A has a strap that supports the positive electrode plate 4A (for example, the positive electrode strap 11A) and an intermediate pole column (for example, the positive electrode intermediate pole column 12A) that connects the positive electrode strap 11A and the resistance welded portion 123. The resistance welded portion 123 extends from the surface of the positive electrode intermediate pole column 12A facing the partition wall 3 (for example, the back surface 12b) into the through hole 3H.
The positive electrode intermediate pole column 12A has a recess 125 at a position between the resistance welded portion 123 and the positive electrode strap 11A. The portion of the positive electrode intermediate pole column 12A located near the recess 125 is the fragile portion.

鉛蓄電池１００によれば、グロースによって正極板４Ａが電槽の底部と接触し、正極板４Ａが正極接続体１１０Ａを押し上げる場合でも、正極中間極柱１２Ａの抵抗溶接部１２３が変形する前に脆弱部が変形する。脆弱部が優先的に塑性変形することによって、抵抗溶接部１２３にはたらく力を低減し、抵抗溶接部１２３の変形を抑制することができる。これにより、鉛蓄電池１００は、抵抗溶接部１２３と隔壁３との間に隙間が生じることを抑制することができるので、隔壁３を介して隣り合うセル室１間での液リークの発生を抑制することができる。 According to the lead-acid battery 100, even when the positive electrode plate 4A comes into contact with the bottom of the battery case due to growth and the positive electrode plate 4A pushes up the positive electrode connector 110A, the resistance welded portion 123 of the positive electrode intermediate pole column 12A is fragile before being deformed. The part is deformed. By preferentially plastically deforming the fragile portion, the force acting on the resistance welded portion 123 can be reduced and the deformation of the resistance welded portion 123 can be suppressed. As a result, the lead-acid battery 100 can suppress the formation of a gap between the resistance welded portion 123 and the partition wall 3, and thus suppresses the occurrence of liquid leakage between the adjacent cell chambers 1 via the partition wall 3. can do.

隣り合うセル室間で液リークが発生すると、鉛蓄電池の内部抵抗が上昇し、電圧が低下する可能性ある。アイドリングストップ車の場合は、鉛蓄電池の電圧が低下すると、アイドリングストップが禁止される状態になる可能性がある。しかしながら、鉛蓄電池１００によれば、隔壁３を介して隣り合うセル室１間で、液リークの発生が抑制される。このため、鉛蓄電池１００は、内部抵抗の上昇と、電圧の低下を抑制することができる。本発明の第１実施形態によれば、液リークの発生を抑制可能であり、アイドリングストップ車に好適な信頼性の高い鉛蓄電池を提供することができる。 If a liquid leak occurs between adjacent cell chambers, the internal resistance of the lead-acid battery may increase and the voltage may decrease. In the case of an idling stop vehicle, if the voltage of the lead storage battery drops, idling stop may be prohibited. However, according to the lead-acid battery 100, the occurrence of liquid leakage is suppressed between the adjacent cell chambers 1 via the partition wall 3. Therefore, the lead-acid battery 100 can suppress an increase in internal resistance and a decrease in voltage. According to the first embodiment of the present invention, it is possible to suppress the occurrence of liquid leakage, and it is possible to provide a highly reliable lead-acid battery suitable for an idling stop vehicle.

（変形例）
図４は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例１を示す断面図である。第１実施形態に係る正極接続体１１０Ａにおいて、凹部１２５は三角形の切り欠きに限定されない。例えば図４に示すように、凹部１２５は、四角形の溝であっても良い。また、凹部１２５は、例えば半円形の溝であっても良い。このような構成であっても、底部１２６が脆弱部として機能する。 (Modification example)
FIG. 4 is a cross-sectional view showing a modification 1 of the positive electrode connector 110A according to the first embodiment of the present invention. In the positive electrode connector 110A according to the first embodiment, the recess 125 is not limited to the triangular notch. For example, as shown in FIG. 4, the recess 125 may be a quadrangular groove. Further, the recess 125 may be, for example, a semicircular groove. Even with such a configuration, the bottom 126 functions as a fragile portion.

図５は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例２を示す側面図である。図５に示すように、凹部１２５は、正極中間極柱１２Ａの幅方向（例えば、Ｙ軸方向）に断続的に設けられていても良い。すなわち、複数の凹部１２５が正極中間極柱１２Ａの幅方向に並ぶように設けられていても良い。このような構成であっても、底部１２６が脆弱部として機能する。 FIG. 5 is a side view showing a modification 2 of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 5, the recess 125 may be provided intermittently in the width direction (for example, the Y-axis direction) of the positive electrode intermediate pole column 12A. That is, a plurality of recesses 125 may be provided so as to be arranged in the width direction of the positive electrode intermediate pole column 12A. Even with such a configuration, the bottom 126 functions as a fragile portion.

図６は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例３を示す側面図である。図６に示すように、凹部１２５は、正極中間極柱１２Ａの幅方向の一方の側に偏って設けられていても良い。このような構成であっても、底部１２６が脆弱部として機能する。 FIG. 6 is a side view showing a modification 3 of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 6, the recess 125 may be provided unevenly on one side in the width direction of the positive electrode intermediate pole column 12A. Even with such a configuration, the bottom 126 functions as a fragile portion.

図７は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例４を示す側面図である。図７に示すように、正極接続体１１０Ａにおいて、正極中間極柱１２Ａの凹部１２５は拡幅されていても良い。例えば、正極中間極柱１２Ａにおいて、凹部１２５の幅方向の寸法Ｗ１は、正極中間極柱１２Ａの幅方向の寸法Ｗ２よりも大きくても良い（Ｗ１＞Ｗ２）。なお、正極中間極柱１２Ａを形成した後、例えば、鉛又は鉛合金が溶ける程度の温度に熱した片や棒を厚み方向（Ｘ軸要項）へ押し当てることにより拡幅された凹部１２５を形成できる。これによれば、底部１２６の断面積Ｓ１を、底部１２６の周囲に位置する他の部位の断面積Ｓ２に近づけることができ、Ｓ１≒Ｓ２とすることができる。ここで、断面積Ｓ１、Ｓ２は、電流が流れる方向と直交する面（例えば、Ｘ−Ｙ平面）で切断した断面の面積である。これにより、正極中間極柱１２Ａにおいて、その長手方向の一端から他端までの電気抵抗を均一化することができる。 FIG. 7 is a side view showing a modified example 4 of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 7, in the positive electrode connector 110A, the recess 125 of the positive electrode intermediate pole column 12A may be widened. For example, in the positive electrode intermediate pole column 12A, the width direction dimension W1 of the recess 125 may be larger than the width direction dimension W2 of the positive electrode intermediate pole column 12A (W1> W2). After forming the positive electrode intermediate pole column 12A, for example, a widened recess 125 can be formed by pressing a piece or rod heated to a temperature at which lead or a lead alloy melts in the thickness direction (X-axis requirement). .. According to this, the cross-sectional area S1 of the bottom portion 126 can be brought close to the cross-sectional area S2 of another portion located around the bottom portion 126, and S1≈S2 can be obtained. Here, the cross-sectional areas S1 and S2 are the areas of cross sections cut along a plane (for example, an XY plane) orthogonal to the direction in which the current flows. As a result, in the positive electrode intermediate pole column 12A, the electrical resistance from one end to the other end in the longitudinal direction can be made uniform.

上記の第１実施形態では、正極中間極柱１２Ａに脆弱部が設けられていることを説明した。しかしながら、第１実施形態において、脆弱部が設けられる位置はこれに限定されない。正極ストラップ１１Ａにおいて、抵抗溶接部１２３よりも下側であれば、任意の位置に脆弱部が設けられていても良い。 In the first embodiment described above, it has been explained that the positive electrode intermediate pole column 12A is provided with a fragile portion. However, in the first embodiment, the position where the fragile portion is provided is not limited to this. In the positive electrode strap 11A, a fragile portion may be provided at an arbitrary position as long as it is below the resistance welded portion 123.

図８は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例５を示す断面図である。図８に示すように、抵抗溶接部１２３よりも下側に正極ストラップ１１Ａが位置する正極接続体１１０Ａの変形例５では、正極ストラップ１１Ａの上面１１ｂに凹部１１５が設けられている。凹部１１５は、正極ストラップ１１Ａの長手方向の途中の位置に設けられている。凹部１１５の形状は、例えば三角形の切り欠きである。 FIG. 8 is a cross-sectional view showing a modified example 5 of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 8, in the modified example 5 of the positive electrode connector 110A in which the positive electrode strap 11A is located below the resistance welded portion 123, the recess 115 is provided on the upper surface 11b of the positive electrode strap 11A. The recess 115 is provided at a position in the middle of the positive electrode strap 11A in the longitudinal direction. The shape of the recess 115 is, for example, a triangular notch.

この変形例５では、正極ストラップ１１Ａであって凹部１１５の近傍に位置する部位（例えば、凹部１１５の底部１１６）が脆弱部となっている。例えば、力Ｆ（図３参照）に対して、抵抗溶接部１２３よりも底部１１６が優先的に塑性変形し、ストラップ１１Ａが上方向へ屈曲する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。 In this modification 5, a portion of the positive electrode strap 11A located near the recess 115 (for example, the bottom 116 of the recess 115) is a fragile portion. For example, with respect to the force F (see FIG. 3), the bottom portion 116 is plastically deformed preferentially over the resistance welded portion 123, and the strap 11A is bent upward. As a result, even when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is created between the resistance welded portion 123 and the through hole 3H. It can be prevented from occurring.

なお、正極ストラップ１１Ａの上面１１ｂに設けられる凹部１１５の形状は、三角形の切り欠きに限定されない。図９は、本発明の第１実施形態に係る正極接続体１１０Ａの変形例６を示す断面図である。図９に示すように、凹部１１５は、四角形の溝であっても良い。また、凹部１１５は、例えば半円形の溝であっても良い。このような構成であっても、底部１１６が脆弱部として機能する。 The shape of the recess 115 provided on the upper surface 11b of the positive electrode strap 11A is not limited to the triangular notch. FIG. 9 is a cross-sectional view showing a modified example 6 of the positive electrode connector 110A according to the first embodiment of the present invention. As shown in FIG. 9, the recess 115 may be a quadrangular groove. Further, the recess 115 may be, for example, a semicircular groove. Even with such a configuration, the bottom 116 functions as a fragile portion.

＜第２実施形態＞
本発明の実施形態において、脆弱部は、正極中間極柱１２Ａに設けられた曲部であっても良い。図１０は、本発明の第２実施形態に係る鉛蓄電池２００の構成例を示す断面図である。図１０に示すように、第２実施形態に係る鉛蓄電池２００は、貫通孔３Ｈの外側に配置される孔外接続部として、正極接続体２１０Ａを備える。正極接続体２１０Ａは、正極ストラップ１１Ａと正極中間極柱１２Ａとを有する。正極接続体２１０Ａが有する正極中間極柱１２Ａは、正極中間極柱１２Ａの長手方向（例えば、Ｚ軸方向）に平行な直線部１２７と、Ｚ軸方向と交差する方向に曲がった曲部１２８と、を有する。 <Second Embodiment>
In the embodiment of the present invention, the fragile portion may be a curved portion provided on the positive electrode intermediate pole column 12A. FIG. 10 is a cross-sectional view showing a configuration example of the lead storage battery 200 according to the second embodiment of the present invention. As shown in FIG. 10, the lead-acid battery 200 according to the second embodiment includes a positive electrode connector 210A as an extra-hole connection portion arranged outside the through hole 3H. The positive electrode connector 210A has a positive electrode strap 11A and a positive electrode intermediate pole column 12A. The positive electrode intermediate pole pillar 12A included in the positive electrode connecting body 210A includes a straight portion 127 parallel to the longitudinal direction (for example, the Z-axis direction) of the positive electrode intermediate pole pillar 12A and a curved portion 128 bent in a direction intersecting the Z-axis direction. , Have.

図１１は、本発明の第２実施形態に係る正極接続体２１０Ａの塑性変形の例を示す図である。図１１に示すように、鉛蓄電池２００においても、正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらくと、正極ストラップ１１Ａは上方向に押圧される。抵抗溶接部１２３は貫通孔３Ｈ内の内周面に接しているため、正極中間極柱１２Ａは上方向への移動が制限されている。このため、正極ストラップ１１Ａが上方向に押圧されると、正極中間極柱１２Ａには曲げやねじりの力がはたらく。 FIG. 11 is a diagram showing an example of plastic deformation of the positive electrode connector 210A according to the second embodiment of the present invention. As shown in FIG. 11, also in the lead storage battery 200, when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A, the positive electrode strap 11A is pressed upward. Since the resistance welded portion 123 is in contact with the inner peripheral surface in the through hole 3H, the movement of the positive electrode intermediate pole column 12A in the upward direction is restricted. Therefore, when the positive electrode strap 11A is pressed upward, a bending or twisting force acts on the positive electrode intermediate pole column 12A.

正極中間極柱１２Ａにおいて、曲部１２８は、正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆに対する剛性が低い脆弱部となっている。正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆが所定の大きさ以上の場合、図１１に示すように、直線部１２７に対して剛性が低い曲部１２８が変形する。正極中間極柱１２Ａにおいて、曲部１２８は、直線部１２７よりも曲げの力がはたらき易く、剛性が低い。 In the positive electrode intermediate pole column 12A, the curved portion 128 is a fragile portion having low rigidity against the force F acting from the positive electrode plate 4A to the positive electrode strap 11A. When the force F acting from the positive electrode plate 4A to the positive electrode strap 11A is equal to or greater than a predetermined magnitude, as shown in FIG. 11, the curved portion 128 having lower rigidity with respect to the straight portion 127 is deformed. In the positive electrode intermediate pole column 12A, the curved portion 128 is more likely to exert a bending force than the straight portion 127 and has a lower rigidity.

力Ｆに対して、抵抗溶接部１２３よりも曲部１２８が優先的に塑性変形し、曲部１２８が上方向へ屈曲する。これにより、グロースが原因で正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。鉛蓄電池２００は、抵抗溶接部１２３と隔壁３との間に隙間が生じることを抑制することができるので、隔壁３を介して隣り合うセル室１間での液リークの発生を抑制することができる。 With respect to the force F, the curved portion 128 is plastically deformed preferentially over the resistance welded portion 123, and the curved portion 128 is bent upward. As a result, even when the force F acts on the positive electrode strap 11A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is prevented from being generated between the resistance welded portion 123 and the through hole 3H. be able to. Since the lead-acid battery 200 can suppress the formation of a gap between the resistance welded portion 123 and the partition wall 3, it is possible to suppress the occurrence of liquid leakage between the adjacent cell chambers 1 via the partition wall 3. it can.

＜第３実施形態＞
本発明の実施形態においては、材料の違いや、結晶構造の違いによって脆弱部を設けるようにしても良い。図１２は、本発明の第３実施形態に係る鉛蓄電池３００の構成例を示す断面図である。図１２に示すように、第３実施形態に係る鉛蓄電池３００は、貫通孔３Ｈの外側に配置される孔外接続部として、正極接続体３１０Ａを備える。正極接続体３１０Ａは、正極ストラップ１１Ａと正極中間極柱１２Ａとを有する。正極接続体３１０Ａが有する正極中間極柱１２Ａは、抵抗溶接部１２３に接続する上側部位１３１と、正極ストラップ１１Ａに接続する下側部位１３２とを有する。第３実施形態において、上側部位１３１は本発明の第１部位の一例であり、下側部位１３２は本発明の第２部位の一例である。 <Third Embodiment>
In the embodiment of the present invention, the fragile portion may be provided depending on the difference in materials and the difference in crystal structure. FIG. 12 is a cross-sectional view showing a configuration example of the lead storage battery 300 according to the third embodiment of the present invention. As shown in FIG. 12, the lead-acid battery 300 according to the third embodiment includes a positive electrode connector 310A as an extra-hole connection portion arranged outside the through hole 3H. The positive electrode connector 310A has a positive electrode strap 11A and a positive electrode intermediate pole column 12A. The positive electrode intermediate pole column 12A included in the positive electrode connecting body 310A has an upper portion 131 connected to the resistance welded portion 123 and a lower portion 132 connected to the positive electrode strap 11A. In the third embodiment, the upper part 131 is an example of the first part of the present invention, and the lower part 132 is an example of the second part of the present invention.

抵抗溶接部１２３は、上側部位１３１において、隔壁３と向かい合ううら面１３１ｂから貫通孔３Ｈ内へ延設されている。抵抗溶接部１２３は、上側部位１３１と同じ組成で且つ同じ結晶構造を有する材料で構成されている。
上側部位１３１と下側部位１３２は、互いに異なる組成の材料で構成されている。例えば、上側部位１３１及び下側部位１３２を構成する鉛合金の添加物の添加量を変化させれば良く、上側部位１３１を添加物であるアンチモンを５質量％以上添加した鉛合金とし、下側部位１３２はアンチモンを５質量％未満添加した鉛合金とすれば良い。 The resistance welded portion 123 extends from the back surface 131b facing the partition wall 3 into the through hole 3H at the upper portion 131. The resistance welded portion 123 is made of a material having the same composition and the same crystal structure as the upper portion 131.
The upper portion 131 and the lower portion 132 are made of materials having different compositions from each other. For example, the amount of the additive of the lead alloy constituting the upper portion 131 and the lower portion 132 may be changed, and the upper portion 131 is a lead alloy to which the additive antimony is added in an amount of 5% by mass or more, and the lower side is used. The site 132 may be a lead alloy containing less than 5% by mass of antimony.

上側部位１３１と下側部位１３２が、互いに同じ組成の材料で構成されている場合は、結晶の平均粒径（以下、結晶平均粒径ともいう）の違いにより脆弱部を設けても良い。例えば、下側部位１３２に対して、上側部位１３１をより高温で熱処理する（又は、より長時間熱処理する）ことによって、上側部位１３１の結晶平均粒径を大きくすることが可能である。結晶平均粒径の違いにより、上側部位１３１と下側部位１３２との間では剛性に差が生じ、この部分が脆弱部となる。 When the upper portion 131 and the lower portion 132 are made of materials having the same composition as each other, a fragile portion may be provided due to a difference in the average particle size of crystals (hereinafter, also referred to as crystal average particle size). For example, it is possible to increase the crystal average particle size of the upper portion 131 by heat-treating the upper portion 131 at a higher temperature (or heat-treating for a longer time) with respect to the lower portion 132. Due to the difference in crystal average particle size, there is a difference in rigidity between the upper portion 131 and the lower portion 132, and this portion becomes a fragile portion.

第３実施形態では、上側部位１３１と下側部位１３２との間が、力Ｆ（例えば、図３参照）に対する剛性が低い脆弱部となっている。力Ｆが所定の大きさ以上の場合、抵抗溶接部１２３が貫通孔３Ｈの内周面に押圧されて変形するよりも前に、下側部位１３２が屈曲する。力Ｆに対して、抵抗溶接部１２３よりも下側部位１３２が優先的に塑性変形する。
これにより、グロースが原因で正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。鉛蓄電池３００は、抵抗溶接部１２３と隔壁３との間に隙間が生じることを抑制することができるので、隔壁３を介して隣り合うセル室１間での液リークの発生を抑制することができる。 In the third embodiment, the area between the upper portion 131 and the lower portion 132 is a fragile portion having low rigidity against a force F (see, for example, FIG. 3). When the force F is equal to or larger than a predetermined magnitude, the lower portion 132 is bent before the resistance welded portion 123 is pressed against the inner peripheral surface of the through hole 3H and deformed. With respect to the force F, the lower portion 132 is preferentially plastically deformed over the resistance welded portion 123.
As a result, even when the force F acts on the positive electrode strap 11A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is prevented from being generated between the resistance welded portion 123 and the through hole 3H. be able to. Since the lead-acid battery 300 can suppress the formation of a gap between the resistance welded portion 123 and the partition wall 3, it is possible to suppress the occurrence of liquid leakage between the adjacent cell chambers 1 via the partition wall 3. it can.

＜第４実施形態＞
図１３は、本発明の第４実施形態に係る鉛蓄電池４００の構成例を示す断面図である。図１４は、本発明の第４実施形態に係る正極接続体４１０Ａの構成例を示す側面図である。図１３の断面図は、図１４の側面図をＸ−Ｚ面で切断した断面に対応している。Ｘ−Ｚ面とは、Ｘ軸方向及びＺ軸方向に平行な面である。図１３及び図１４に示すように、第４実施形態に係る鉛蓄電池４００は、貫通孔３Ｈの外側に配置される孔外接続部として、正極接続体４１０Ａを備える。正極接続体４１０Ａは、正極ストラップ１１Ａと、正極中間極柱１２Ａと、正極ストラップ１１Ａと正極中間極柱１２Ａとの接続を補強する補強部１５とを有する。 <Fourth Embodiment>
FIG. 13 is a cross-sectional view showing a configuration example of the lead storage battery 400 according to the fourth embodiment of the present invention. FIG. 14 is a side view showing a configuration example of the positive electrode connector 410A according to the fourth embodiment of the present invention. The cross-sectional view of FIG. 13 corresponds to a cross-section of the side view of FIG. 14 cut along the XX plane. The XZ plane is a plane parallel to the X-axis direction and the Z-axis direction. As shown in FIGS. 13 and 14, the lead-acid battery 400 according to the fourth embodiment includes a positive electrode connector 410A as an extra-hole connection portion arranged outside the through hole 3H. The positive electrode connecting body 410A has a positive electrode strap 11A, a positive electrode intermediate pole column 12A, and a reinforcing portion 15 for reinforcing the connection between the positive electrode strap 11A and the positive electrode intermediate pole column 12A.

図１３に示すように、正極ストラップ１１Ａは、正極板４Ａを支持する面（以下、下面という）１１ａと、下面１１ａの反対側に位置する上面１１ｂと、を有する。補強部１５は、正面から見た形状が三角形である。補強部１５は、正極中間極柱１２Ａのおもて面１２ａに接続する部位１５１と、正極ストラップ１１Ａの上面１１ｂに接続する部位１５２と、を有する。正極ストラップ１１Ａの上面１１ｂに接続する部位１５２の先端部１５２ｔは、正極ストラップ１１Ａの長手方向（例えば、Ｘ軸方向）の途中に位置する。補強部１５は、鉛又は鉛合金で構成されている。例えば、正極ストラップ１１Ａ、正極中間極柱１２Ａ及び補強部１５は、鋳型を用いて一体成型されており、１つの部品として正極接続体４１０Ａを構成している。 As shown in FIG. 13, the positive electrode strap 11A has a surface (hereinafter, referred to as a lower surface) 11a that supports the positive electrode plate 4A, and an upper surface 11b located on the opposite side of the lower surface 11a. The reinforcing portion 15 has a triangular shape when viewed from the front. The reinforcing portion 15 has a portion 151 connected to the front surface 12a of the positive electrode intermediate pole column 12A and a portion 152 connected to the upper surface 11b of the positive electrode strap 11A. The tip portion 152t of the portion 152 connected to the upper surface 11b of the positive electrode strap 11A is located in the middle of the positive electrode strap 11A in the longitudinal direction (for example, the X-axis direction). The reinforcing portion 15 is made of lead or a lead alloy. For example, the positive electrode strap 11A, the positive electrode intermediate pole column 12A, and the reinforcing portion 15 are integrally molded using a mold, and the positive electrode connecting body 410A is formed as one component.

図１５は、本発明の第４実施形態に係る正極接続体４１０Ａの塑性変形の例を示す図である。図１５に示すように、鉛蓄電池４００においても、正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらくと、正極ストラップ１１Ａは上方向に押圧される。抵抗溶接部１２３は貫通孔３Ｈ内の内周面に接しているため、正極中間極柱１２Ａは上方向への移動が制限されている。このため、正極ストラップ１１Ａが上方向に押圧されると、正極中間極柱１２Ａには曲げやねじりの力がはたらく。 FIG. 15 is a diagram showing an example of plastic deformation of the positive electrode connecting body 410A according to the fourth embodiment of the present invention. As shown in FIG. 15, also in the lead storage battery 400, when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A, the positive electrode strap 11A is pressed upward. Since the resistance welded portion 123 is in contact with the inner peripheral surface in the through hole 3H, the movement of the positive electrode intermediate pole column 12A in the upward direction is restricted. Therefore, when the positive electrode strap 11A is pressed upward, a bending or twisting force acts on the positive electrode intermediate pole column 12A.

正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらくと、正極ストラップ１１Ａにおいて補強部１５の先端部１５２ｔと隣り合う部位に力がかかる。このため、正極ストラップ１１Ａにおいて、補強部１５の先端部１５２ｔと隣り合う部位は、正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆに対する剛性が低い脆弱部となっている。すなわち、補強部１５の先端部１５２ｔが、脆弱部の位置を規定している。力Ｆが所定の大きさ以上の場合、抵抗溶接部１２３が貫通孔３Ｈの内周面に押圧されて変形するよりも前に、図１５に示すように、先端部１５２ｔが支点となって正極ストラップ１１Ａが変形する。 When a force F acts from the positive electrode plate 4A to the positive electrode strap 11A, a force is applied to the portion of the positive electrode strap 11A adjacent to the tip portion 152t of the reinforcing portion 15. Therefore, in the positive electrode strap 11A, the portion adjacent to the tip portion 152t of the reinforcing portion 15 is a fragile portion having low rigidity against the force F acting from the positive electrode plate 4A to the positive electrode strap 11A. That is, the tip portion 152t of the reinforcing portion 15 defines the position of the fragile portion. When the force F is equal to or larger than a predetermined magnitude, the positive electrode portion 152t serves as a fulcrum before the resistance welded portion 123 is pressed against the inner peripheral surface of the through hole 3H and deformed, as shown in FIG. The strap 11A is deformed.

力Ｆに対して、抵抗溶接部１２３よりも正極ストラップ１１Ａが優先的に塑性変形する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。鉛蓄電池４００は、抵抗溶接部１２３と隔壁３との間に隙間が生じることを抑制することができるので、隔壁３を介して隣り合うセル室１間での液リークの発生を抑制することができる。 The positive electrode strap 11A is preferentially plastically deformed over the resistance welded portion 123 with respect to the force F. As a result, even when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is created between the resistance welded portion 123 and the through hole 3H. It can be prevented from occurring. Since the lead-acid battery 400 can suppress the formation of a gap between the resistance welded portion 123 and the partition wall 3, it is possible to suppress the occurrence of liquid leakage between the adjacent cell chambers 1 via the partition wall 3. it can.

（変形例）
上述の第４実施形態では、補強部１５の先端部１５２ｔが、正極ストラップ１１Ａにおける脆弱部の位置を規定していることを説明した。しかしながら、第１実施形態において、補強部１５が規定する脆弱部の位置は正極ストラップ１１Ａに限定されない。補強部１５が規定する脆弱部の位置は、抵抗溶接部１２３よりも下側であれば任意の位置でよく、例えば、抵抗溶接部１２３よりも下側であって正極中間極柱１２Ａの長手方向の途中の位置であっても良い。 (Modification example)
In the fourth embodiment described above, it has been explained that the tip portion 152t of the reinforcing portion 15 defines the position of the fragile portion in the positive electrode strap 11A. However, in the first embodiment, the position of the fragile portion defined by the reinforcing portion 15 is not limited to the positive electrode strap 11A. The position of the fragile portion defined by the reinforcing portion 15 may be any position as long as it is below the resistance welded portion 123. For example, it is below the resistance welded portion 123 and is in the longitudinal direction of the positive electrode intermediate pole column 12A. It may be in the middle of.

図１６は、本発明の第４実施形態に係る正極接続体４１０Ａの変形例を示す断面図である。図１６に示すように、補強部１５の先端部１５１ｔは、正極中間極柱１２Ａのおもて面１２ａに接続する部位１５１の先端に位置する部位であり、抵抗溶接部１２３よりも下側である正極中間極柱１２Ａの長手方向（例えば、Ｚ軸方向）の途中に位置する。この変形例では、補強部１５の先端部１５１ｔが脆弱部の位置を規定しており、正極中間極柱１２Ａにおいて、補強部１５の先端部１５１ｔと隣り合う部位が脆弱部となっている。 FIG. 16 is a cross-sectional view showing a modified example of the positive electrode connecting body 410A according to the fourth embodiment of the present invention. As shown in FIG. 16, the tip portion 151t of the reinforcing portion 15 is a portion located at the tip of the portion 151 connected to the front surface 12a of the positive electrode intermediate pole column 12A, and is located below the resistance welded portion 123. It is located in the middle of a positive electrode intermediate pole column 12A in the longitudinal direction (for example, the Z-axis direction). In this modification, the tip portion 151t of the reinforcing portion 15 defines the position of the fragile portion, and the portion of the positive electrode intermediate pole column 12A adjacent to the tip portion 151t of the reinforcing portion 15 is the fragile portion.

力Ｆが所定の大きさ以上の場合、抵抗溶接部１２３が貫通孔３Ｈの内周面に押圧されて変形するよりも前に、先端部１５１ｔが支点となって正極中間極柱１２Ａが変形する。正極中間極柱１２Ａにおいて、抵抗溶接部１２３よりも下側であり、正極中間極柱１２Ａの長手方向の途中に位置する部位が優先的に塑性変形する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。 When the force F is equal to or larger than a predetermined magnitude, the positive electrode intermediate pole column 12A is deformed with the tip portion 151t as a fulcrum before the resistance welded portion 123 is pressed against the inner peripheral surface of the through hole 3H and deformed. .. In the positive electrode intermediate pole column 12A, a portion which is below the resistance welded portion 123 and is located in the middle of the positive electrode intermediate pole column 12A in the longitudinal direction is preferentially plastically deformed. As a result, even when the force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to the growth, the force acting on the resistance welded portion 123 can be relaxed, and a gap is created between the resistance welded portion 123 and the through hole 3H. It can be prevented from occurring.

＜第５実施形態＞
図１７は、本発明の第５実施形態に係る鉛蓄電池５００の構成例を示す断面図である。図１８は、本発明の第５実施形態に係る正極接続体５１０Ａの構成例を示す側面図である。図１７の断面図は、図１８の側面図をＸ−Ｚ面で切断した断面に対応している。Ｘ−Ｚ面とは、Ｘ軸方向及びＺ軸方向に平行な面である。
図１７及び図１８に示すように、鉛蓄電池５００は、貫通孔３Ｈの外側に配置される孔外接続部として、正極接続体５１０Ａを備える。正極接続体５１０Ａは、正極ストラップ１１Ａと正極中間極柱１２Ａとを有する。正極接続体５１０Ａにおいて、正極中間極柱１２Ａは、正極ストラップ１１Ａに接続する下側部位１２１と、抵抗溶接部１２３に接続する上側部位１２２と、を有する。第５実施形態において、上側部位１２２は本発明の第３部位の一例であり、下側部位１２１は本発明の第４部位の一例である。上側部位１２２の平均厚み（すなわち、厚みの平均値）をＡとし、下側部位１２１の平均厚みをＢとすると、ＡはＢよりも薄い（Ａ＜Ｂ）。 <Fifth Embodiment>
FIG. 17 is a cross-sectional view showing a configuration example of the lead storage battery 500 according to the fifth embodiment of the present invention. FIG. 18 is a side view showing a configuration example of the positive electrode connector 510A according to the fifth embodiment of the present invention. The cross-sectional view of FIG. 17 corresponds to a cross section of the side view of FIG. 18 cut along the XX plane. The XZ plane is a plane parallel to the X-axis direction and the Z-axis direction.
As shown in FIGS. 17 and 18, the lead-acid battery 500 includes a positive electrode connector 510A as an extra-hole connection portion arranged outside the through hole 3H. The positive electrode connector 510A has a positive electrode strap 11A and a positive electrode intermediate pole column 12A. In the positive electrode connecting body 510A, the positive electrode intermediate pole column 12A has a lower portion 121 connected to the positive electrode strap 11A and an upper portion 122 connected to the resistance welded portion 123. In the fifth embodiment, the upper part 122 is an example of the third part of the present invention, and the lower part 121 is an example of the fourth part of the present invention. Assuming that the average thickness of the upper portion 122 (that is, the average value of the thickness) is A and the average thickness of the lower portion 121 is B, A is thinner than B (A <B).

下側部位１２１と上側部位１２２との間には段差１２４がある。段差１２４の大きさは、平均厚みＡ、Ｂの差（＝Ｂ−Ａ）である。段差１２４は、正極中間極柱１２Ａのおもて面１２ａ側に位置する。正極中間極柱１２Ａのうら面１２ｂ側には、段差は存在しない。正極中間極柱１２Ａのうら面１２ｂ側は、下側部位１２１と上側部位１２２との間で面一となっている。なお、平均厚みＡ、Ｂの差がわずかでもあれば段差１２４となり、平均厚みＡは平均厚みＢの１／２以上が好ましい。 There is a step 124 between the lower portion 121 and the upper portion 122. The size of the step 124 is the difference between the average thicknesses A and B (= BA). The step 124 is located on the front surface 12a side of the positive electrode intermediate pole column 12A. There is no step on the back surface 12b side of the positive electrode intermediate pole column 12A. The back surface 12b side of the positive electrode intermediate pole column 12A is flush with the lower portion 121 and the upper portion 122. If the difference between the average thicknesses A and B is small, the step difference is 124, and the average thickness A is preferably ½ or more of the average thickness B.

図１９は、本発明の第５実施形態に係る正極接続体５１０Ａの塑性変形の例を示す図である。図１９に示すように、鉛蓄電池５００において、正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらくと、正極ストラップ１１Ａは上方向に押圧される。力Ｆは、グロースにより正極板４Ａが電槽の底部に接触することにより発生する。抵抗溶接部１２３は貫通孔３Ｈ内の内周面に接しているため、正極中間極柱１２Ａは上方向への移動が制限されている。このため、正極ストラップ１１Ａが上方向に押圧されると、正極中間極柱１２Ａには曲げやねじりの力がはたらく。 FIG. 19 is a diagram showing an example of plastic deformation of the positive electrode connector 510A according to the fifth embodiment of the present invention. As shown in FIG. 19, in the lead-acid battery 500, when a force F acts on the positive electrode strap 11A from the positive electrode plate 4A, the positive electrode strap 11A is pressed upward. The force F is generated when the positive electrode plate 4A comes into contact with the bottom of the battery case due to growth. Since the resistance welded portion 123 is in contact with the inner peripheral surface in the through hole 3H, the movement of the positive electrode intermediate pole column 12A in the upward direction is restricted. Therefore, when the positive electrode strap 11A is pressed upward, a bending or twisting force acts on the positive electrode intermediate pole column 12A.

正極中間極柱１２Ａにおいて、段差１２４の近傍に位置する部位（例えば、上側部位１２２であって、下側部位１２１に近い側の端部）は、正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆに対する剛性が低い脆弱部となっている。正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆが所定の大きさ以上の場合、抵抗溶接部１２３が貫通孔３Ｈの内周面に押圧されて変形するよりも前に、図１９に示すように脆弱部が変形する。力Ｆに対して、抵抗溶接部１２３よりも脆弱部が優先的に塑性変形し、下側部位１２１が上方向へ屈曲する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と隔壁３の貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。これにより、隔壁３を介して隣り合うセル室１間での液リークの発生を抑制することができる。 In the positive electrode intermediate pole column 12A, the portion located near the step 124 (for example, the upper portion 122 and the end portion on the side closer to the lower portion 121) is against the force F acting from the positive electrode plate 4A to the positive electrode strap 11A. It is a fragile part with low rigidity. When the force F acting from the positive electrode plate 4A to the positive electrode strap 11A is equal to or larger than a predetermined magnitude, the resistance welded portion 123 is fragile as shown in FIG. 19 before being pressed by the inner peripheral surface of the through hole 3H and deformed. The part is deformed. With respect to the force F, the fragile portion is preferentially plastically deformed over the resistance welded portion 123, and the lower portion 121 is bent upward. As a result, even when a force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to growth, the force acting on the resistance welded portion 123 can be relaxed, and between the resistance welded portion 123 and the through hole 3H of the partition wall 3. It is possible to prevent a gap from being formed in the. As a result, it is possible to suppress the occurrence of liquid leakage between adjacent cell chambers 1 via the partition wall 3.

上述の第５実施形態では、正極中間極柱１２Ａにおいて、段差１２４の近傍に位置する部位が脆弱部となることを説明した。しかしながら、第５実施形態において、脆弱部の位置は、正極中間極柱１２Ａに限定されない。脆弱部の位置は、抵抗溶接部１２３よりも下側であれば任意の位置でよく、例えば、正極ストラップ１１Ａの長手方向の途中の位置であっても良い。 In the fifth embodiment described above, it has been explained that in the positive electrode intermediate pole column 12A, the portion located in the vicinity of the step 124 becomes the fragile portion. However, in the fifth embodiment, the position of the fragile portion is not limited to the positive electrode intermediate pole column 12A. The position of the fragile portion may be any position as long as it is below the resistance welded portion 123, and may be, for example, a position in the middle of the positive electrode strap 11A in the longitudinal direction.

図２０は、本発明の第５実施形態に係る正極接続体５１０Ａの変形例を示す断面図である。図２０に示すように、この変形例では、正極ストラップ１１Ａは、正極中間極柱１２Ａに接続する部位（以下、厚肉部という）１１１と、厚肉部１１１を挟んで正極中間極柱１２Ａの反対側に位置する部位（以下、薄肉部という）１１２とを有する。厚肉部１１１の平均厚みは、薄肉部１１２の平均厚みよりも大きい。厚肉部１１１と薄肉部１１２との間には段差１１４がある。段差１１４の大きさは、厚肉部１１１と薄肉部１１２との厚さの差である。段差１１４は、正極ストラップ１１Ａの上面１１ｂ側に位置する。 FIG. 20 is a cross-sectional view showing a modified example of the positive electrode connector 510A according to the fifth embodiment of the present invention. As shown in FIG. 20, in this modification, the positive electrode strap 11A has a portion (hereinafter referred to as a thick portion) 111 connected to the positive electrode intermediate pole column 12A and a positive electrode intermediate pole pillar 12A sandwiching the thick portion 111. It has a portion (hereinafter referred to as a thin-walled portion) 112 located on the opposite side. The average thickness of the thick portion 111 is larger than the average thickness of the thin portion 112. There is a step 114 between the thick portion 111 and the thin portion 112. The size of the step 114 is the difference in thickness between the thick portion 111 and the thin portion 112. The step 114 is located on the upper surface 11b side of the positive electrode strap 11A.

正極ストラップ１１Ａにおいて、段差１１４の近傍に位置する部位は、正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆに対する剛性が低い脆弱部となっている。正極板４Ａから正極ストラップ１１Ａにはたらく力Ｆが所定の大きさ以上の場合、抵抗溶接部１２３が貫通孔３Ｈの内周面に押圧されて変形するよりも前に、脆弱部が変形する。力Ｆに対して、抵抗溶接部１２３よりも脆弱部が優先的に塑性変形し、薄肉部１１２が上方向へ屈曲する。これにより、グロースが原因で正極板４Ａから正極ストラップ１１Ａに力Ｆがはたらく場合でも、抵抗溶接部１２３にはたらく力を緩和することができ、抵抗溶接部１２３と隔壁３の貫通孔３Ｈとの間に隙間が生じることを防ぐことができる。 In the positive electrode strap 11A, the portion located near the step 114 is a fragile portion having low rigidity against the force F acting from the positive electrode plate 4A to the positive electrode strap 11A. When the force F acting from the positive electrode plate 4A to the positive electrode strap 11A is equal to or larger than a predetermined magnitude, the fragile portion is deformed before the resistance welded portion 123 is pressed against the inner peripheral surface of the through hole 3H and deformed. With respect to the force F, the fragile portion is preferentially plastically deformed over the resistance welded portion 123, and the thin portion 112 is bent upward. As a result, even when a force F acts on the positive electrode strap 11A from the positive electrode plate 4A due to growth, the force acting on the resistance welded portion 123 can be relaxed, and between the resistance welded portion 123 and the through hole 3H of the partition wall 3. It is possible to prevent a gap from being formed in the.

なお、本発明の実施形態に係る鉛蓄電池は、鉛又は鉛合金を圧延して成形した圧延基板を少なくとも正極基板に用いた場合により効果を奏する。圧延基板は鋳造基板と比較し、結晶粒界が大きく、反応に伴うグロースが大きいため、抵抗溶接部１２３で液リークが発生しやすい。圧延基板としては例えば、エキスパンド加工や打ち抜き加工によって格子を成形できる。なお、圧延基板を正極基板だけでなく、負極基板に用いても良い。 The lead-acid battery according to the embodiment of the present invention is more effective when a rolled substrate formed by rolling lead or a lead alloy is used as at least a positive electrode substrate. Compared to the cast substrate, the rolled substrate has a large grain boundary and a large growth accompanying the reaction, so that a liquid leak is likely to occur at the resistance welded portion 123. As the rolled substrate, for example, a lattice can be formed by an expanding process or a punching process. The rolled substrate may be used not only for the positive electrode substrate but also for the negative electrode substrate.

（試験電池）
第１から第５実施形態に係る鉛蓄電池と同じ構造の鉛蓄電池として、実施例１から５の鉛蓄電池を従来公知の方法で作製した。また、比較例として、脆弱部がない構造の鉛蓄電池を従来公知の方法で作製した。具体的には、電池サイズはＭ−４２型とし、負極基板及び正極基板はエキスパンド格子とし、極板群を構成する正極板の枚数を６枚、負極板の枚数を７枚とした。鉛蓄電池は、実施例１から５と比較例とについて、それぞれ３つずつ作製した。以下、実施例１から５と比較例とを、水準と称することもある。 (Test battery)
As the lead-acid battery having the same structure as the lead-acid battery according to the first to fifth embodiments, the lead-acid batteries of Examples 1 to 5 were produced by a conventionally known method. Further, as a comparative example, a lead storage battery having a structure without fragile portions was produced by a conventionally known method. Specifically, the battery size was M-42 type, the negative electrode substrate and the positive electrode substrate were expanded lattices, the number of positive electrode plates constituting the electrode plate group was 6, and the number of negative electrode plates was 7. Three lead-acid batteries were prepared for each of Examples 1 to 5 and Comparative Example. Hereinafter, Examples 1 to 5 and Comparative Example may be referred to as a level.

（良否判定）
同水準３つの鉛蓄電池について、抵抗溶接後に全てのセルで不良が発生しなかった場合を良：〇とし、不良が１つでも発生した場合を不良：×と判定した。 (Good or bad judgment)
For three lead-acid batteries of the same level, the case where no defect occurred in all cells after resistance welding was evaluated as good: 〇, and the case where even one defect occurred was determined as defective: ×.

（過充電寿命試験）
上記の良否判定で良：〇と判定された水準について、以下の方法で過充電寿命試験を実施した。
処理１；水槽内での放電後充電の繰り返し及び休止
鉛蓄電池を、７５℃の水槽内に入れて、電流２５Ａでの４分間の放電と、その後の制御電圧１４．８Ｖ及び最大電流２５Ａの条件での１０分間の充電を、４８０回繰り返す。次に、水槽から鉛蓄電池を取り出して、２５℃の雰囲気で５６時間静置する。
処理２：水槽外での一回の放電及び充電
２５℃の雰囲気で、電流３４０Ａで３０秒間の放電を行う。なお、３０秒目の終止電圧が７．２Ｖ以下となった場合は、液リークが発生したと判断して、その時点で試験を停止する。次に、制御電圧１４．８Ｖ及び最大電流２５Ａの条件での１０分間の充電を行う。
上記処理１の後に上記処理２を行うことを４回繰り返した後、上記処理１を１回行った。これにより、水槽内での放電後充電は２４００回繰り返したことになり、２４００回の充放電が終了した時点で隔壁を介して隣接するセル室間で、液リークが発生しなかった場合を良：〇と判定し、液リークが発生した場合を不良：×と判定した。 (Overcharge life test)
The overcharge life test was carried out by the following method for the level judged as good by the above quality judgment.
Process 1; Repeating and suspending charging after discharging in the water tank Put the lead-acid battery in the water tank at 75 ° C. for 4 minutes of discharging at a current of 25A, and then conditions of a control voltage of 14.8V and a maximum current of 25A. The charging for 10 minutes in the above is repeated 480 times. Next, the lead-acid battery is taken out from the water tank and allowed to stand in an atmosphere of 25 ° C. for 56 hours.
Treatment 2: One-time discharge and charge outside the water tank Discharge for 30 seconds at a current of 340 A in an atmosphere of 25 ° C. If the final voltage at 30 seconds is 7.2 V or less, it is determined that a liquid leak has occurred, and the test is stopped at that point. Next, charging is performed for 10 minutes under the conditions of a control voltage of 14.8 V and a maximum current of 25 A.
After the above-mentioned process 1 was repeated four times, the above-mentioned process 1 was performed once. As a result, charging after discharging in the water tank is repeated 2400 times, and it is good if no liquid leak occurs between the adjacent cell chambers via the partition wall when 2400 times of charging / discharging is completed. : It was judged as 〇, and when a liquid leak occurred, it was judged as defective: ×.

（総合判定）
良否判定及び過充電寿命試験について、いずれも良：〇と判定された水準を総合判定で良：〇と評価した。 (Comprehensive judgment)
Regarding the quality judgment and the overcharge life test, the level judged as good: 〇 was evaluated as good: 〇 in the comprehensive judgment.

（結果）
良否判定、過充電寿命試験及び総合判定の結果を表１に示す。

Figure 2020167095
(result)
Table 1 shows the results of the quality judgment, the overcharge life test, and the comprehensive judgment.
Figure 2020167095

表１に示すように、実施例１から５の鉛蓄電池は、良否判定の結果が良、過充電寿命試験の結果が良であり、総合判定が良であった。実施例１から５の鉛蓄電池は、製造不良は発生せず、液リークを防止できることがわかった。これに対して、比較例の鉛蓄電池は、良否判定の結果が不良、過充電寿命試験の結果が不良、総合判定が不良であった。 As shown in Table 1, the lead-acid batteries of Examples 1 to 5 had good quality judgment results, good results of the overcharge life test, and good overall judgment. It was found that the lead-acid batteries of Examples 1 to 5 did not cause manufacturing defects and could prevent liquid leakage. On the other hand, the lead-acid battery of the comparative example had a poor quality judgment result, a poor overcharge life test result, and a poor overall judgment.

１ セル室
３ 隔壁
３Ｈ 貫通孔
４ 極板
４Ａ 正極板
４Ｂ 負極板
１１ ストラップ
１１ａ 下面
１１Ａ 正極ストラップ
１１ｂ 上面
１１Ｂ 負極ストラップ
１２ａ おもて面
１２Ａ 正極中間極柱
１２ｂ うら面
１２Ｂ 負極中間極柱
１５ 補強部
１００、２００、３００、４００、５００ 鉛蓄電池
１１０Ａ、２１０Ａ、３１０Ａ、４１０Ａ、５１０Ａ 正極接続体
１１０Ｂ、５１０Ｂ 負極接続体
１５１ｔ、１５２ｔ 先端部 1 Cell chamber 3 Partition 3H Through hole 4 Pole plate 4A Positive electrode plate 4B Negative electrode plate 11 Strap 11a Lower surface 11A Positive electrode strap 11b Upper surface 11B Negative electrode strap 12a Front surface 12A Positive electrode intermediate pole column 12b Back surface 12B Negative electrode intermediate pole column 15 Reinforcing part 100, 200, 300, 400, 500 Lead-acid batteries 110A, 210A, 310A, 410A, 510A Positive electrode connection 110B, 510B Negative electrode connection 151t, 152t Tip

Claims (8)

任意の第１のセル室に配置される第１の極板を前記第１のセル室と隔壁を介して隣り合う第２のセル室に配置される第２の極板に接続する接続体、を備え、
前記接続体は、
前記隔壁に設けられた貫通孔内に配置される孔内接続部と、
前記貫通孔の外側に配置される孔外接続部と、を有し、
前記孔外接続部は、前記孔内接続部よりも下側に脆弱部を有する、鉛蓄電池。 A connector for connecting a first plate arranged in an arbitrary first cell chamber to a second plate arranged in a second cell chamber adjacent to the first cell chamber via a partition wall. With
The connector
An in-hole connection portion arranged in a through hole provided in the partition wall,
It has an extra-hole connection portion arranged outside the through hole, and has
The outside-hole connection portion is a lead-acid battery having a fragile portion below the inside-hole connection portion. 前記孔外接続部は、
前記第１の極板を支持するストラップと、
前記ストラップと前記孔内接続部とを接続する中間極柱と、を有し、
前記孔内接続部は、前記中間極柱において前記隔壁と向かい合う面から前記貫通孔内へ延設されている、請求項１に記載の鉛蓄電池。 The outer connection portion is
A strap that supports the first electrode plate and
It has an intermediate pole column that connects the strap and the in-hole connection portion, and has.
The lead-acid battery according to claim 1, wherein the in-hole connection portion extends into the through hole from a surface of the intermediate pole column facing the partition wall. 前記中間極柱は、前記孔内接続部と前記ストラップとの間の位置に凹部を有し、
前記中間極柱において前記凹部の近傍に位置する部位が前記脆弱部である、請求項２に記載の鉛蓄電池。 The intermediate pole column has a recess at a position between the in-hole connection portion and the strap.
The lead-acid battery according to claim 2, wherein a portion of the intermediate pole column located in the vicinity of the recess is the fragile portion. 前記中間極柱は、前記孔内接続部と前記ストラップとの間の位置に、前記中間極柱の長手方向と交差する方向に曲がった曲部を有し、
前記曲部が前記脆弱部である、請求項２に記載の鉛蓄電池。 The intermediate pole column has a curved portion bent in a direction intersecting the longitudinal direction of the intermediate pole column at a position between the in-hole connection portion and the strap.
The lead-acid battery according to claim 2, wherein the curved portion is the fragile portion. 前記中間極柱は、
前記孔内接続部に接続する第１部位と、
前記第１部位と前記ストラップとの間に位置し、材料の組成及び結晶構造の少なくとも一方が前記第１部位とは異なる第２部位と、を有し、
前記第２部位が前記脆弱部である、請求項２に記載の鉛蓄電池。 The intermediate pole pillar
The first part connected to the in-hole connection part and
It is located between the first site and the strap and has a second site in which at least one of the composition and crystal structure of the material is different from the first site.
The lead-acid battery according to claim 2, wherein the second portion is the fragile portion. 前記接続体は、
前記ストラップと前記中間極柱との接続を補強する補強部、をさらに有し、
前記ストラップは、
前記第１の極板を支持する第１面と、
前記第１面の反対側に位置する第２面と、を有し、
前記補強部は、
前記中間極柱に接続する部位と、
前記第２面に接続する部位と、を有し、
前記中間極柱に接続する部位の第１の先端部は、前記孔内接続部よりも下側である前記中間極柱の長手方向の途中に位置し、
前記第２面に接続する部位の第２の先端部は、前記ストラップの長手方向の途中に位置し、
前記第１の先端部又は前記第２の先端部と隣り合う部位が前記脆弱部である、請求項２に記載の鉛蓄電池。 The connector
Further having a reinforcing portion for reinforcing the connection between the strap and the intermediate pole column,
The strap
A first surface that supports the first electrode plate and
It has a second surface located on the opposite side of the first surface, and has.
The reinforcing portion is
The part connected to the intermediate pole column and
It has a portion connected to the second surface and
The first tip portion of the portion connected to the intermediate pole pillar is located in the middle of the longitudinal direction of the intermediate pole pillar, which is below the in-hole connection portion.
The second tip of the portion connected to the second surface is located in the middle of the strap in the longitudinal direction.
The lead-acid battery according to claim 2, wherein the first tip portion or a portion adjacent to the second tip portion is the fragile portion. 前記中間極柱は、
前記孔内接続部に接続する第３部位と、
前記ストラップに接続する第４部位と、を有し、
前記第３部位の平均厚みは前記第４部位の平均厚みよりも薄く、
前記第３部位と前記第４部位との間に段差があり、
前記中間極柱において前記段差の近傍に位置する部位が前記脆弱部である、請求項２に記載の鉛蓄電池。 The intermediate pole pillar
A third portion connected to the in-hole connection portion and
It has a fourth portion that connects to the strap and
The average thickness of the third part is thinner than the average thickness of the fourth part.
There is a step between the third part and the fourth part,
The lead-acid battery according to claim 2, wherein a portion of the intermediate pole column located near the step is the fragile portion. 前記第１の極板及び前記第２の極板の少なくとも一方が圧延基板であることを特徴とする請求項１〜７のいずれか１項に記載の鉛蓄電池。 The lead-acid battery according to any one of claims 1 to 7, wherein at least one of the first electrode plate and the second electrode plate is a rolled substrate.
JP2019068345A 2019-03-29 2019-03-29 Lead-acid battery Pending JP2020167095A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933497B1 (en) * 1966-11-14 1974-09-07
JPS5543754A (en) * 1978-09-20 1980-03-27 Yuasa Battery Co Ltd Method of manufacturing storage battery
JPS57124967U (en) * 1981-01-30 1982-08-04
JPH0294254A (en) * 1988-09-29 1990-04-05 Aisin Seiki Co Ltd Storage battery
JPH11250894A (en) * 1998-02-26 1999-09-17 Shin Kobe Electric Mach Co Ltd Lead-acid battery, and manufacture thereof
JP2001266833A (en) * 2000-03-15 2001-09-28 Yuasa Corp Cell connection structure for lead acid battery
JP2011159551A (en) * 2010-02-03 2011-08-18 Panasonic Corp Lead-acid storage battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933497B1 (en) * 1966-11-14 1974-09-07
JPS5543754A (en) * 1978-09-20 1980-03-27 Yuasa Battery Co Ltd Method of manufacturing storage battery
JPS57124967U (en) * 1981-01-30 1982-08-04
JPH0294254A (en) * 1988-09-29 1990-04-05 Aisin Seiki Co Ltd Storage battery
JPH11250894A (en) * 1998-02-26 1999-09-17 Shin Kobe Electric Mach Co Ltd Lead-acid battery, and manufacture thereof
JP2001266833A (en) * 2000-03-15 2001-09-28 Yuasa Corp Cell connection structure for lead acid battery
JP2011159551A (en) * 2010-02-03 2011-08-18 Panasonic Corp Lead-acid storage battery

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