JP2008243811A - Battery - Google Patents

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JP2008243811A
JP2008243811A JP2008047050A JP2008047050A JP2008243811A JP 2008243811 A JP2008243811 A JP 2008243811A JP 2008047050 A JP2008047050 A JP 2008047050A JP 2008047050 A JP2008047050 A JP 2008047050A JP 2008243811 A JP2008243811 A JP 2008243811A
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electrode plate
battery
connection terminal
current collector
sealing body
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Yasushi Nakamura
靖志 中村
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2008047050A priority Critical patent/JP2008243811A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery having small direct current resistance and superior current collection performance. <P>SOLUTION: The battery has a case 8 with a bottom storing a group of electrode plates 4 wherein a beltlike positive electrode plate 1 and a beltlike negative electrode plate 2 are laminated or spirally wound via a separator 3 and an electrolyte in its inside and also serving as one external terminal, a sealing-up body 10 tightly shutting up an opening at an upper end of the case 8 with a bottom by caulking sealing-up, and also serving as the other external terminal, and a connection terminal 7 for electrically connecting the sealing-up body 10 and an upper current collector 5 wherein one electrode plate of the group of electrode plates 4 is welded. A part of the outer periphery of the connection terminal 7 and a part of the sealing-up body 10 are electrically connected by caulking sealing-up. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は高出力化を図ることが出来る新規な集電構造を備えた電池に関するものである。   The present invention relates to a battery having a novel current collecting structure capable of achieving high output.

アルカリ蓄電池やリチウムイオン二次電池などの電池は、ポータブル機器や電動工具、あるいは電気自動車用の電源として広く用いられている。中でも比較的エネルギー密度が高く耐久性に優れるニッケル水素蓄電池については、電気自動車用電源を中心にその用途が広がりつつある。   Batteries such as alkaline storage batteries and lithium ion secondary batteries are widely used as power sources for portable devices, electric tools, or electric vehicles. Above all, the use of nickel-metal hydride storage batteries, which have a relatively high energy density and excellent durability, is expanding mainly in power sources for electric vehicles.

ニッケル水素蓄電池は、帯状の正極板と負極板との間にセパレータを介在させて渦巻状に巻回した極板群を、一方の外部端子を兼ねる金属製の有底ケースに収納し、さらに金属製の有底ケースの開口部を他方の外部端子を兼ねる封口体により密閉化して構成される。   Nickel metal hydride storage batteries house a group of electrode plates wound in a spiral shape with a separator interposed between a strip-shaped positive electrode plate and a negative electrode plate in a metal bottomed case that also serves as one external terminal, The opening of the bottomed case made of the product is configured to be sealed by a sealing body that also serves as the other external terminal.

大電流放電に適した極板群からの出入力集電構造としては、正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出するように極板群を構成し、それぞれの突出部分に矩形あるいは略円板状の上部集電体および下部集電体を溶接し、上部集電体の上面にタブ端子を抵抗溶接して、そのタブ端子の他端を封口体の下面に抵抗溶接する方式が一般的に用いられている。   As the input / output current collecting structure from the electrode plate group suitable for large current discharge, one side edge along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and the above-mentioned along the longitudinal direction of the negative electrode plate. The electrode plate group is configured such that the side edge portion opposite to the one side edge portion protrudes downward from the electrode plate group, and each of the protruding portions has a rectangular or substantially disc-shaped upper current collector and lower current collector. Generally, a method is used in which an electric body is welded, a tab terminal is resistance-welded to the upper surface of the upper current collector, and the other end of the tab terminal is resistance-welded to the lower surface of the sealing body.

図8に従来の円筒型蓄電池の構成を示した概略断面図を示す。   FIG. 8 is a schematic sectional view showing the configuration of a conventional cylindrical storage battery.

帯状の正極板11と負極板12との間にセパレータ13を介在させて渦巻き状に巻回し、極板群14を構成する。極板群14の下方に突出する負極板の側縁部12aに下部集電体16を溶接し、極板群14の上方に突出する正極板の側縁部11aにタブ端子17を予め溶接した上部集電体15を溶接する。   A separator 13 is interposed between the strip-like positive electrode plate 11 and the negative electrode plate 12 and is wound in a spiral shape to constitute an electrode plate group 14. The lower current collector 16 is welded to the side edge portion 12a of the negative electrode plate protruding downward from the electrode plate group 14, and the tab terminal 17 is previously welded to the side edge portion 11a of the positive electrode plate protruding above the electrode plate group 14. The upper current collector 15 is welded.

次に、上部集電体15と下部集電体16を溶接した極板群14を金属製の有底ケース18に収納し、下部集電体16を金属製の有底ケース18の底部内面に溶接する。上部集電体15の上面には絶縁リング19を配置し、溝部18aを形成して極板群14を金属製の有底ケース18内に保持する。タブ端子17の上方には蓋板20a、ゴム弁体20b、キャップ20c、ガスケット20dを備えた封口体20を溶接する。   Next, the electrode plate group 14 in which the upper current collector 15 and the lower current collector 16 are welded is housed in a metal bottomed case 18, and the lower current collector 16 is placed on the bottom inner surface of the metal bottomed case 18. Weld. An insulating ring 19 is disposed on the upper surface of the upper current collector 15, and a groove 18 a is formed to hold the electrode plate group 14 in a metal bottomed case 18. Above the tab terminal 17, the sealing body 20 provided with the cover plate 20a, the rubber valve body 20b, the cap 20c, and the gasket 20d is welded.

その後、電解液を上部集電体15に設けた注液口15aより有底ケース18内に注入し、タブ端子17を折り曲げながら封口体20を金属製の有底ケース18の開口部に配置し、この開口部をかしめ封口により密閉して円筒型蓄電池を作製する。   Thereafter, the electrolytic solution is injected into the bottomed case 18 from the liquid injection port 15 a provided in the upper current collector 15, and the sealing body 20 is disposed in the opening of the metal bottomed case 18 while bending the tab terminal 17. The cylindrical storage battery is manufactured by sealing this opening with a caulking seal.

大電流放電が必要な用途に用いる場合、極板群14から効率的に電流を取り出す必要があるため上部集電体15、下部集電体16、タブ端子17の直流抵抗を低減するよう求められる。   When used for an application that requires a large current discharge, it is necessary to efficiently extract current from the electrode plate group 14, so that it is required to reduce the DC resistance of the upper current collector 15, the lower current collector 16, and the tab terminal 17. .

これらの直流抵抗を低減するため、例えばタブ端子17はできるだけ短い部品を用いることが望ましいが、上部集電体15に溶接されたタブ端子17の他端に封口体20を溶接するときに、少なくとも封口体20の外径寸法の半分程度の長さが必要になる。また、タブ端子17の長さをさらに短くするために特殊な工法や溶接方法などが必要になり、さまざまな方法が提案されている。   In order to reduce these DC resistances, for example, it is desirable that the tab terminal 17 be as short as possible. However, when the sealing body 20 is welded to the other end of the tab terminal 17 welded to the upper current collector 15, at least. About half the outer diameter of the sealing body 20 is required. Moreover, in order to further shorten the length of the tab terminal 17, a special construction method or a welding method is required, and various methods have been proposed.

例えば、タブ端子を用いないで極板群の上方に突出した正極板の側縁部に封口体の下面を直接接合する方法が提案されている。   For example, a method has been proposed in which the lower surface of the sealing body is directly joined to the side edge portion of the positive electrode plate protruding above the electrode plate group without using the tab terminal.

図9にタブ端子を用いないで作製した円筒型蓄電池の構成を示した概略断面図を示す。   FIG. 9 is a schematic cross-sectional view showing the configuration of a cylindrical storage battery manufactured without using a tab terminal.

帯状の正極板21と負極板22との間にセパレータ23を介在させて渦巻き状に巻回し、極板群24を構成する。極板群24の下方に突出する負極板の側縁部22aに下部集電体26を溶接し、極板群24の上方に突出する正極板の側縁部21aに上部集電体25を溶接する。   A separator 23 is interposed between the strip-like positive electrode plate 21 and the negative electrode plate 22 and wound in a spiral shape to constitute an electrode plate group 24. The lower current collector 26 is welded to the side edge portion 22a of the negative electrode plate protruding downward from the electrode plate group 24, and the upper current collector 25 is welded to the side edge portion 21a of the positive electrode plate protruding above the electrode plate group 24. To do.

次に、上部集電体25と下部集電体26を溶接した極板群24を金属製の有底ケース28に収納し、下部集電体26を金属製の有底ケース28の底部内面に溶接し、上部集電体25の上面に封口体30の蓋板30aと絶縁リング29を配置し、溝部28aを形成した後、溝部28aの上部にガスケット30dを載置した状態で蓋板30aと上部集電体25を溶接し、金属製の有底ケース28の開口部を内方にかしめる。蓋板30aの中央部に設けた注液口、および上部集電体25に設けた注液口25aより有底ケース28内に電解液を注入し、蓋板30aにゴム弁体30b、キャップ30cを配置し、キャップ30cを蓋板30aに溶接して円筒型蓄電池を作製する。   Next, the electrode plate group 24 in which the upper current collector 25 and the lower current collector 26 are welded is housed in a metal bottomed case 28, and the lower current collector 26 is placed on the bottom inner surface of the metal bottomed case 28. After the welding, the lid plate 30a of the sealing body 30 and the insulating ring 29 are arranged on the upper surface of the upper current collector 25, and the groove portion 28a is formed. Then, the gasket 30d is placed on the upper portion of the groove portion 28a and the lid plate 30a The upper current collector 25 is welded, and the opening of the bottomed case 28 made of metal is caulked inward. The electrolyte is injected into the bottomed case 28 from the liquid inlet provided in the center of the lid plate 30a and the liquid inlet 25a provided in the upper current collector 25, and the rubber valve body 30b and the cap 30c are injected into the lid plate 30a. And a cap 30c is welded to the lid plate 30a to produce a cylindrical storage battery.

このようにタブ端子を用いないで極板群24の上方に突出した正極板の側縁部21aまたは上部集電体25に封口体30の下面を直接接合した構造とすることで、円筒型蓄電池の出力向上を図ったものが提案されている(例えば、特許文献1参照)。
特開2000−243433号公報
Thus, a cylindrical storage battery is obtained by directly joining the lower surface of the sealing body 30 to the side edge portion 21a of the positive electrode plate or the upper current collector 25 protruding above the electrode plate group 24 without using the tab terminal. Has been proposed (see, for example, Patent Document 1).
JP 2000-243433 A

しかしながら、このようなタブ端子を用いないで極板群の上方に突出した正極板の側縁部または上部集電体に封口体の下面を直接接合する方法は、封口体の上方からレーザー照射して溶接する必要があり、封口体に穴が開いて電解液が漏液するおそれがあった。この穴開きを防ぐためにレーザーの出力を低くして溶接を行った場合には、溶接が不十分となり、直流抵抗が上昇するおそれがあった。   However, the method of directly joining the lower surface of the sealing body to the side edge of the positive electrode plate protruding above the electrode group or the upper current collector without using such a tab terminal is to irradiate laser from above the sealing body. There is a risk that the electrolyte may leak due to a hole in the sealing body. When welding was performed with a low laser output in order to prevent this hole opening, welding was insufficient and there was a risk that the DC resistance would increase.

本発明は上記課題を解決するものであり、封口体と上部集電体とを電気的に接続する接続端子の外周部の一部分と封口体の一部分とをかしめ封口により電気的に接続することで、封口体からの漏液がなく、直流抵抗が小さく極板群からの集電性能に優れた電池を提供することを目的とする。   The present invention solves the above-mentioned problem, and by electrically connecting a part of the outer peripheral portion of the connection terminal for electrically connecting the sealing body and the upper current collector and a part of the sealing body by caulking and sealing. An object of the present invention is to provide a battery that does not leak from the sealing body, has a low direct current resistance, and has excellent current collecting performance from the electrode plate group.

上記の課題を解決するために本発明は、帯状の正極板と負極板とをセパレータを介して積層または渦巻状に巻回してなる極板群と電解液とを内部に収納した一方の外部端子を兼ねた有底ケースと、この有底ケースの上端部の開口部をかしめ封口により密閉する他方の外部端子を兼ねた封口体と、この封口体と前記極板群の一方の極板と溶接した上部集電体とを電気的に接続する接続端子を備えた電池であって、前記接続端子の外周部の一部分と封口体の一部分とをかしめ封口により電気的に接続したことを特徴とする。   In order to solve the above-described problems, the present invention provides an external terminal in which a group of electrode plates formed by laminating a band-like positive electrode plate and a negative electrode plate via a separator or spirally wound therein and an electrolyte are housed inside A bottomed case that also serves as a sealing member, a sealing body that also serves as the other external terminal that seals the opening at the upper end of the bottomed case with a caulking seal, and welds the sealing body and one electrode plate of the electrode plate group A battery provided with a connection terminal for electrically connecting the upper current collector, wherein a part of the outer peripheral portion of the connection terminal and a part of the sealing body are electrically connected by caulking and sealing. .

この構成により、封口体からの漏液がなく、直流抵抗が小さく極板群からの集電性能に優れた電池を容易に作製できる。   With this configuration, it is possible to easily produce a battery that does not leak from the sealing body, has a low direct current resistance, and has excellent current collecting performance from the electrode plate group.

本発明によれば、封口体と上部集電体とを電気的に接続する接続端子の外周部の一部分と封口体の一部分とをかしめ封口により電気的に接続するため、封口体からの漏液がなく、直流抵抗が小さく極板群からの集電性能に優れた電池を容易な方法で提供できる効果が得られる。   According to the present invention, since a part of the outer peripheral portion of the connection terminal that electrically connects the sealing body and the upper current collector and the part of the sealing body are electrically connected by caulking, liquid leakage from the sealing body Thus, an effect of providing a battery having a small direct current resistance and excellent current collecting performance from the electrode plate group by an easy method is obtained.

本発明においては、帯状の正極板と負極板とをセパレータを介して積層または渦巻状に巻回してなる極板群と電解液とを内部に収納した一方の外部端子を兼ねた有底ケースと、この有底ケースの上端部の開口部をかしめ封口により密閉する他方の外部端子を兼ねた封口体と、この封口体と前記極板群の一方の極板に溶接した上部集電体とを電気的に接続する接続端子を備えた電池であって、前記接続端子の外周部の一部分と封口体の一部分とをかしめ封口により電気的に接続したものである。   In the present invention, a bottomed case that also serves as one external terminal containing a plate group formed by laminating a band-like positive electrode plate and a negative electrode plate via a separator or spirally wound therein and an electrolyte solution therein A sealing body that also serves as the other external terminal that seals the opening at the upper end of the bottomed case by caulking, and an upper current collector welded to the sealing body and one electrode plate of the electrode plate group. A battery provided with a connection terminal for electrical connection, wherein a part of the outer peripheral portion of the connection terminal and a part of the sealing body are electrically connected by caulking and sealing.

この構成によれば、封口体と接続端子をかしめ封口により電気的に接合するので、封口体の上方から溶接する必要がない。このため、封口体に穴が開いて電解液が漏液するおそれがない。また、封口前の状態で、接続端子と極板群の一方の極板を溶接した後、接続端子と封口体を溶接することなく、短い接続端子によって封口体と電気的に接続できるため、直流抵抗が小さく極板群からの集電性能に優れた電池を容易に作製することが可能となる。   According to this configuration, since the sealing body and the connection terminal are electrically joined by caulking sealing, it is not necessary to weld from above the sealing body. For this reason, there is no possibility that the sealing body has a hole and the electrolyte solution leaks. In addition, since the connection terminal and one electrode plate of the electrode plate group are welded in a state before sealing, the connection terminal and the sealing body can be electrically connected to the sealing body with a short connection terminal without welding. A battery having low resistance and excellent current collecting performance from the electrode plate group can be easily produced.

また、前記接続端子の外周部を構成する連結部に放射方向に設けられ内方に突出する先端部が下方に折り曲げられた複数個の舌片を設けた構成が望ましい。   Further, it is desirable that a plurality of tongue pieces are provided in a connecting portion that constitutes the outer peripheral portion of the connection terminal, and provided with a plurality of tongue pieces that are radially bent and bent downward.

この構成によれば、接続端子と上部集電体を溶接する時に極板群の高さの違いにより、上部集電体の高さが異なっても、舌片の折り曲げられた部分が変形したり、下方に折り曲げられた舌片の高さ方向の直線部分が湾曲したりすることで溶接が安定する効果が得られる。また、溶接した後に電池に振動や衝撃が加わった場合でも、この下方に折り曲げられた複数個の舌片が振動や衝撃を吸収して緩和する効果がある。   According to this configuration, when the connection terminal and the upper current collector are welded, even if the height of the upper current collector is different due to the difference in height of the electrode plate group, the bent portion of the tongue piece is deformed. The effect that the welding is stabilized is obtained by bending the straight portion in the height direction of the tongue piece bent downward. Further, even when vibration or impact is applied to the battery after welding, the plurality of tongue pieces bent downward have an effect of absorbing and mitigating the vibration and impact.

また、前記有底ケースの上端部の開口部に外方に突出する鍔部を設け、この鍔部に設置した封口体を鍔部の周縁部の屈曲部でかしめ封口した構成が望ましい。   Further, it is desirable that a flange projecting outward is provided at the opening of the upper end portion of the bottomed case, and the sealing body installed on the collar is caulked and sealed with a bent portion at the peripheral edge of the collar.

この構成によれば、有底ケースに溝部を設ける必要がないため、接続端子はこの溝部の高さ方向の寸法を補うだけの長さが必要なく、より短くできる。このように短い接続端子を構成できるため直流抵抗をより小さくできる効果が得られる。   According to this configuration, since it is not necessary to provide the groove portion in the bottomed case, the connection terminal does not need to be long enough to compensate for the height dimension of the groove portion, and can be shortened. Since a short connection terminal can be configured in this way, an effect of reducing the DC resistance can be obtained.

また、2〜6個の舌片を設けた構成が望ましい。   Moreover, the structure which provided 2-6 tongue pieces is desirable.

この構成によれば、溶接回数が少なく短時間で溶接できるという工程上の効果と、直流抵抗を小さくできるという電池特性上の効果が得られる。   According to this configuration, it is possible to obtain an effect on the process that the number of weldings is small and welding can be performed in a short time, and an effect on the battery characteristics that the direct current resistance can be reduced.

また、舌片の先端部に接続端子の外周部に沿う突片を設けた構成が望ましい。   Moreover, the structure which provided the protrusion along the outer peripheral part of a connection terminal in the front-end | tip part of a tongue piece is desirable.

この構成によれば、突片が極板群の高さ方向のばらつきに柔軟に対応できる。その結果、上部集電体との接触が良くなり溶接が安定して、より直流抵抗を小さくできる効果が得られる。   According to this configuration, the projecting piece can flexibly cope with variations in the height direction of the electrode plate group. As a result, the contact with the upper current collector is improved, welding is stabilized, and the effect of further reducing the DC resistance can be obtained.

以下に本発明の円筒型蓄電池の構成について図面を用いて説明する。   The configuration of the cylindrical storage battery of the present invention will be described below with reference to the drawings.

図3(a)に本発明の円筒型蓄電池に用いた極板群の構成を示した斜視図、図3(b)
に本発明の円筒型蓄電池に用いた極板群と上部集電体および下部集電体の構成を示した斜視図を示す。
FIG. 3A is a perspective view showing the configuration of the electrode plate group used in the cylindrical storage battery of the present invention, and FIG.
The perspective view which showed the structure of the electrode group used for the cylindrical storage battery of this invention, the upper collector, and the lower collector is shown.

図3(a)に示したように、端部に正極板の側縁部1aを備えた帯状の焼結式の正極板1と、同様に端部に負極板の側縁部2aを備えた、ニッケルメッキパンチング鋼鈑に水素吸蔵合金を主体とする負極活物質を塗着した負極板2を形成する。これらの正極板1、負極板2を、正極板の側縁部1aと負極板の側縁部2aが相反する方向にセパレータ3から突出するよう渦巻き状に巻回し、極板群4を構成する。図3(b)に示したように、極板群4の上方に突出した正極板の側縁部1aに注液口5aを設けた上部集電体5を溶接し、下方に突出した負極板の側縁部2aに下部集電体6を溶接する。   As shown in FIG. 3 (a), a belt-like sintered positive electrode plate 1 having a positive electrode plate side edge portion 1a at the end portion and a negative electrode plate side edge portion 2a at the end portion. Then, a negative electrode plate 2 is formed by coating a negative electrode active material mainly composed of a hydrogen storage alloy on a nickel plating punched steel sheet. The positive electrode plate 1 and the negative electrode plate 2 are spirally wound so as to protrude from the separator 3 in a direction in which the side edge portion 1a of the positive electrode plate and the side edge portion 2a of the negative electrode plate are opposed to each other, thereby forming the electrode plate group 4. . As shown in FIG. 3B, the upper current collector 5 provided with a liquid injection port 5a is welded to the side edge 1a of the positive electrode plate protruding upward from the electrode plate group 4, and the negative electrode plate protruding downward The lower current collector 6 is welded to the side edge 2a.

図4(a)〜(e)に本発明の円筒型蓄電池の組み立て工程を示した説明図を示す。図4(a)は本発明の円筒型蓄電池の極板群挿入工程を示した説明図、図4(b)は本発明の円筒型蓄電池のガスケット挿入工程を示した説明図、図4(c)は本発明の円筒型蓄電池の接続端子溶接工程を示した説明図、図4(d)は本発明の円筒型蓄電池の封口体設置工程を示した説明図、図4(e)は本発明の円筒型蓄電池のかしめ工程を示した説明図である。   4A to 4E are explanatory views showing the assembly process of the cylindrical storage battery of the present invention. FIG. 4A is an explanatory view showing the electrode plate group insertion process of the cylindrical storage battery of the present invention, FIG. 4B is an explanatory view showing the gasket insertion process of the cylindrical storage battery of the present invention, and FIG. ) Is an explanatory view showing the connecting terminal welding process of the cylindrical storage battery of the present invention, FIG. 4 (d) is an explanatory view showing the sealing body installation process of the cylindrical storage battery of the present invention, and FIG. 4 (e) is the present invention. It is explanatory drawing which showed the crimping process of the cylindrical storage battery of this.

図4(a)に示したように、上部集電体5と下部集電体6を各々正極板の側縁部1aと負極板の側縁部2aに溶接した極板群4を、短絡防止のための絶縁リング9とともに、金属製の有底ケース8に収納し、下部集電体6と金属製の有底ケース8の底部内面とを溶接する。   As shown in FIG. 4A, the electrode plate group 4 in which the upper current collector 5 and the lower current collector 6 are welded to the side edge portion 1a of the positive electrode plate and the side edge portion 2a of the negative electrode plate, respectively, is prevented from short circuit. It is housed in a metal bottomed case 8 together with an insulating ring 9 for welding, and the lower current collector 6 and the bottom inner surface of the metal bottomed case 8 are welded.

次に、図4(b)に示したように、溝部8aを形成した後、ガスケット10dを支持部8bに設置する。   Next, as shown in FIG. 4B, after the groove 8a is formed, the gasket 10d is placed on the support 8b.

図6に本発明の接続端子の一例を示した斜視図を示す。図6に示したように、接続端子7の外周部を構成する連結部7aに放射方向に設けられ内方に突出する先端部が下方に折り曲げられた4個の舌片7bを設けている。   FIG. 6 is a perspective view showing an example of the connection terminal of the present invention. As shown in FIG. 6, four tongue pieces 7 b are provided in the connecting portion 7 a constituting the outer peripheral portion of the connection terminal 7, the tip portions protruding radially inward and bent downward.

この接続端子7を、図4(c)に示したように上部集電体5の上部に設置して接続端子7の舌片7bと上部集電体5を溶接する。   As shown in FIG. 4C, the connection terminal 7 is installed on the upper current collector 5, and the tongue piece 7 b of the connection terminal 7 and the upper current collector 5 are welded.

水酸化カリウムを主体としたアルカリ性電解液を上部集電体5に設けた注液口5aより有底ケース8内に注入後、図4(d)に示したように、有底ケース8の開口部に蓋板10a、ゴム弁体10b、キャップ10c、ガスケット10dを備えた封口体10を設置する。   After the alkaline electrolyte mainly composed of potassium hydroxide is injected into the bottomed case 8 from the injection port 5a provided in the upper current collector 5, as shown in FIG. 4 (d), the opening of the bottomed case 8 is opened. The sealing body 10 provided with the cover plate 10a, the rubber valve body 10b, the cap 10c, and the gasket 10d is installed in the part.

次に、図4(e)に示したように、金属製の有底ケース8の上部を内方にかしめて蓋板10aを固定し、電池を密閉化するとともに、蓋板10aの外周部と接続端子7の外周部を構成する連結部7aを圧接し、電気的に導通させる。   Next, as shown in FIG. 4E, the upper part of the bottomed case 8 made of metal is caulked inward to fix the cover plate 10a, and the battery is sealed, and the outer peripheral portion of the cover plate 10a The connecting portion 7a constituting the outer peripheral portion of the connection terminal 7 is pressed and electrically connected.

以上のような方法で電池の組み立てを行うことで、容易に電池を組み立てることができる。   A battery can be easily assembled by assembling a battery by the above methods.

また、接続端子7の舌片7bと上部集電体5を溶接する際、接続端子7の舌片7bの下方に折り曲げられた部分の角度を変えることで、極板群4の高さ寸法のばらつきを吸収できる効果が得られる。   Further, when the tongue 7b of the connection terminal 7 and the upper current collector 5 are welded, the height dimension of the electrode plate group 4 can be changed by changing the angle of the portion bent downward of the tongue 7b of the connection terminal 7. An effect of absorbing variation can be obtained.

接続端子7の舌片7bの下方に折り曲げられた部分の角度は、舌片7bと上部絶縁体5
を抵抗溶接する際の加圧により容易に変えることができるため、この舌片7bと上部集電体5の高さ方向の位置合わせが容易になり、その結果、舌片7bと上部集電体5の溶接箇所の密着が良くなるので安定して接続端子7と上部集電体5とを溶接することができる。
The angle of the portion of the connecting terminal 7 that is bent below the tongue piece 7b is such that the tongue piece 7b and the upper insulator 5 are angled.
Therefore, the tongue piece 7b and the upper current collector 5 can be easily aligned in the height direction. As a result, the tongue piece 7b and the upper current collector can be easily aligned. Therefore, the connection terminal 7 and the upper current collector 5 can be stably welded.

また、接続端子7の外周部を構成する連結部7aと舌片7bの下方に折り曲げられた中間部分に高さ方向に屈曲できるたわみ部を設けても良い。例えば、じゃばら形状のたわみ部であれば容易に作製できる。このようなたわみ部を設ければ舌片7bの下方に折り曲げられた部分が、極板群4の高さ方向の寸法のばらつきをより効果的に吸収できる。   Moreover, you may provide the bending part which can be bent in a height direction in the intermediate part bent below the connection part 7a and the tongue piece 7b which comprise the outer peripheral part of the connecting terminal 7. FIG. For example, a loosely bent portion can be easily manufactured. If such a bent portion is provided, the portion bent downward of the tongue piece 7b can more effectively absorb the variation in the dimension of the electrode plate group 4 in the height direction.

また、接続端子7の舌片7bと上部集電体5との溶接部は電池内部にあるので、もし、ブローホールが発生しても、液漏れの要因になることはない。   Further, since the welded portion between the tongue piece 7b of the connection terminal 7 and the upper current collector 5 is inside the battery, even if a blowhole occurs, it does not cause liquid leakage.

また、封口体10を有底ケース8の上端開口部に形成された環状の支持部8bに設置し、かしめ封口して接続端子7の連結部7aと封口体10を電気的に導通させることで、短い接続端子7を備えた電池を、容易な方法で作製することができる。   Moreover, the sealing body 10 is installed in the annular support part 8b formed in the upper-end opening part of the bottomed case 8, and it crimps and seals and the connection part 7a of the connection terminal 7 and the sealing body 10 are electrically connected. A battery having a short connection terminal 7 can be manufactured by an easy method.

図5(a)〜(e)に本発明の他の構成の円筒型蓄電池の組み立て工程を示した説明図を示す。図5(a)は本発明の他の構成の円筒型蓄電池の極板群挿入工程を示した説明図、図5(b)は本発明の他の構成の円筒型蓄電池のガスケット挿入工程を示した説明図、図5(c)は本発明の他の構成の円筒型蓄電池の接続端子溶接工程を示した説明図、図5(d)は本発明の他の構成の円筒型蓄電池の封口体設置工程を示した説明図、図5(e)は本発明の他の構成の円筒型蓄電池のかしめ工程を示した説明図である。   FIGS. 5A to 5E are explanatory views showing an assembly process of a cylindrical storage battery having another configuration of the present invention. FIG. 5A is an explanatory view showing an electrode plate group insertion step of a cylindrical storage battery of another configuration of the present invention, and FIG. 5B shows a gasket insertion step of a cylindrical storage battery of another configuration of the present invention. FIG. 5 (c) is an explanatory view showing a connecting terminal welding process of a cylindrical storage battery of another configuration of the present invention, and FIG. 5 (d) is a sealing body of a cylindrical storage battery of another configuration of the present invention. FIG. 5E is an explanatory view showing an installation process, and FIG. 5E is an explanatory view showing a caulking process of a cylindrical storage battery having another configuration of the present invention.

有底ケース8として開口部をあらかじめ拡口して鍔部8cを設け、溝部を形成せず、接続端子7として図7に示したように、接続端子7の外周部を構成する連結部7aに放射方向に設けられ内方に突出する先端部が下方に折り曲げられた4個の舌片7bを設けたものであって、下方に折り曲げられた舌片7bの高さ方向の寸法が短いものを用いた以外は図4(a)〜(e)と同様の組み立て工程である。   As the bottomed case 8, the opening portion is preliminarily widened to provide the flange portion 8 c, the groove portion is not formed, and the connecting terminal 7 is connected to the connecting portion 7 a constituting the outer peripheral portion of the connecting terminal 7 as shown in FIG. 7. Provided are four tongue pieces 7b that are provided in the radial direction and projecting inwardly at the tip portion that protrudes inward, and the height of the tongue piece 7b that is bent downward is short. The assembly process is the same as that shown in FIGS. 4A to 4E except for use.

図4(a)〜(e)に示した組み立て工程は、有底ケース8に溝部8aを作製しているため極板群4の上部と封口体10の間に溝部8aの高さ分だけ空間が空き、その分だけ接続端子7の舌片7bが長くなるが、図5(a)〜(e)に示した組み立て工程によれば、溝部8aを作製する必要がないため、接続端子7の長さをより短くできる効果が得られる。   In the assembly process shown in FIGS. 4A to 4E, since the groove portion 8a is formed in the bottomed case 8, a space corresponding to the height of the groove portion 8a is provided between the upper portion of the electrode plate group 4 and the sealing body 10. However, according to the assembly process shown in FIGS. 5A to 5E, it is not necessary to produce the groove 8a. An effect of shortening the length can be obtained.

次に、図10、図11に示した接続端子について説明する。図10、図11に示した接続端子7は、舌片7bの先端部が接続端子7の外周部に沿って伸びる突片7cを設けている。これにより、極板群4の高さに応じて、上部集電体5と溶接する舌片7bの位置を、突片7cの任意の位置とすることができる。   Next, the connection terminals shown in FIGS. 10 and 11 will be described. The connection terminal 7 shown in FIGS. 10 and 11 is provided with a projecting piece 7 c in which the tip of the tongue piece 7 b extends along the outer peripheral portion of the connection terminal 7. Thereby, according to the height of the electrode plate group 4, the position of the tongue piece 7b welded to the upper collector 5 can be set to an arbitrary position of the protruding piece 7c.

極板群4の高さが低い場合、突片7cに溶接することで、舌片7の高さ方向の変位量を大きくでき、容易に溶接できるようになる。この際、突片7cの先端のほうに溶接するほど舌片7の高さ方向の変位量を大きくできる。   When the height of the electrode plate group 4 is low, the amount of displacement in the height direction of the tongue piece 7 can be increased by welding to the projecting piece 7c, so that it can be easily welded. At this time, the amount of displacement of the tongue piece 7 in the height direction can be increased as the protrusion 7c is welded to the tip.

また、極板群4の高さが比較的高めである場合、連結部7aに近い舌片7bの根元部分で溶接すれば、直流抵抗をより小さくすることができる。このように、接続端子7の舌片7bの先端部が外周部に沿って伸びる突片7cを設けると、極板群4の高さに応じて、上部集電体5上の定位置と接続端子7の突片7cを含む舌片7bの任意の位置に溶接できるため、極板群4の高さ方向のばらつき等、大きな高さ変動に対応できる。   Further, when the height of the electrode plate group 4 is relatively high, the direct current resistance can be further reduced by welding at the base portion of the tongue piece 7b close to the connecting portion 7a. In this way, when the protruding piece 7c in which the tip of the tongue piece 7b of the connection terminal 7 extends along the outer peripheral portion is provided, it is connected to a fixed position on the upper current collector 5 according to the height of the electrode plate group 4. Since welding can be performed at an arbitrary position of the tongue piece 7b including the protruding piece 7c of the terminal 7, it is possible to cope with a large height variation such as a variation in the height direction of the electrode plate group 4.

次に、図12、図13に示した接続端子について説明する。図12、図13に示した接続端子7は舌片7bを1個設けている。この構成によれば、接続端子7と上部集電体5との溶接回数を1回ですませることができるため、接続端子溶接工程を短時間ですませることができる。   Next, the connection terminals shown in FIGS. 12 and 13 will be described. The connection terminal 7 shown in FIGS. 12 and 13 is provided with one tongue piece 7b. According to this configuration, since the number of weldings between the connection terminal 7 and the upper current collector 5 can be performed once, the connection terminal welding process can be performed in a short time.

次に、図14、図15に示した接続端子について説明する。図14、図15に示した接続端子7は舌片7bを2個設けている。この構成によれば、接続端子7と上部集電体5との溶接回数を少なくすませることができ、また、溶接を2ヶ所で行うことができる。   Next, the connection terminals shown in FIGS. 14 and 15 will be described. The connection terminal 7 shown in FIGS. 14 and 15 is provided with two tongue pieces 7b. According to this configuration, the number of weldings between the connection terminal 7 and the upper current collector 5 can be reduced, and welding can be performed at two locations.

次に、図16、図17に示した接続端子について説明する。図16、図17に示した接続端子7は舌片7bを6個設けている。このように舌片7bの数が多いと、直流抵抗の小さい円筒型蓄電池を作製することができる。   Next, the connection terminals shown in FIGS. 16 and 17 will be described. The connection terminal 7 shown in FIGS. 16 and 17 is provided with six tongue pieces 7b. Thus, when there are many tongue pieces 7b, a cylindrical storage battery with small direct-current resistance can be produced.

舌片7bの数を少なくすると、溶接回数が減り、また、溶接箇所の間隔も広くなるため、接続端子溶接工程の溶接が安定し、円筒型蓄電池の作製が容易になる。舌片7bの数が6個以下であれば、十分に溶接が安定する。舌片7bの数を多くすると、直流抵抗を小さくすることができるが、舌片7bの数が2個以上あれば、十分に直流抵抗を小さくすることができる。よって、舌片7bの数を2個から6個にすると、直流抵抗の小さい円筒型蓄電池を、溶接回数少なく作製できるため、特に好ましい。   When the number of the tongue pieces 7b is reduced, the number of weldings is reduced and the interval between the welded portions is widened, so that welding in the connection terminal welding process is stabilized and the cylindrical storage battery can be easily manufactured. If the number of tongue pieces 7b is 6 or less, welding is sufficiently stabilized. If the number of tongue pieces 7b is increased, the direct current resistance can be reduced. However, if the number of tongue pieces 7b is two or more, the direct current resistance can be sufficiently reduced. Therefore, it is particularly preferable to reduce the number of tongue pieces 7b from 2 to 6 because a cylindrical storage battery having a low DC resistance can be produced with a small number of weldings.

本発明の円筒型ニッケル水素蓄電池の作製方法を説明する。   A method for producing the cylindrical nickel-metal hydride storage battery of the present invention will be described.

ニッケル粉末とメチルセルロース、水を混練してペーストとし、ニッケルメッキを施したパンチングメタル芯材に塗工し、乾燥、焼結して焼結式の正極基板とした。この正極基板を硝酸ニッケルを主体とした水溶液と、水酸化ナトリウムを主体としたアルカリ水溶液に交互に含侵し、水酸化ニッケルを充填した。これを乾燥後切断し、長さ550mm、幅48.5mm、厚さ0.32mmの焼結式の正極板1を作成した。なお、焼結式の正極基板の作製時にペーストを塗らない部分を設け、正極板の側縁部1aとした。   Nickel powder, methylcellulose, and water were kneaded to form a paste, applied to a nickel-plated punching metal core, dried and sintered to obtain a sintered positive electrode substrate. This positive electrode substrate was alternately impregnated with an aqueous solution mainly composed of nickel nitrate and an alkaline aqueous solution mainly composed of sodium hydroxide, and was filled with nickel hydroxide. This was dried and then cut to prepare a sintered positive electrode plate 1 having a length of 550 mm, a width of 48.5 mm, and a thickness of 0.32 mm. In addition, the part which does not apply a paste at the time of preparation of a sintering type positive electrode substrate was provided, and it was set as the side edge part 1a of a positive electrode plate.

次に、水素吸蔵合金を、カーボン、カルボキシメチルセルロース水溶液、スチレンブタジエン共重合体ディスパージョンとともに混練し、水素吸蔵合金ペーストとした。これを、ニッケルメッキを施したパンチングメタルに塗工し、乾燥後、圧延、切断を行い、長さ600mm、幅48.5mm、厚さ0.24mmの水素吸蔵合金の負極板2とした。なお、水素吸蔵合金の負極板2の塗工時に水素吸蔵合金ペーストを塗らない部分を設け、負極板の側縁部2aとした。   Next, the hydrogen storage alloy was kneaded with carbon, a carboxymethyl cellulose aqueous solution, and a styrene butadiene copolymer dispersion to obtain a hydrogen storage alloy paste. This was coated on a nickel-plated punching metal, dried, rolled and cut to obtain a hydrogen storage alloy negative electrode plate 2 having a length of 600 mm, a width of 48.5 mm, and a thickness of 0.24 mm. In addition, the part which does not apply a hydrogen storage alloy paste at the time of the application of the negative electrode plate 2 of a hydrogen storage alloy was provided, and it was set as the side edge 2a of the negative electrode plate.

セパレータ3は幅50mm、長さ1200mm、厚さ0.20mmの親水化処理を施したポリプロピレン製不織布を用いた。   As the separator 3, a polypropylene nonwoven fabric having a width of 50 mm, a length of 1200 mm, and a thickness of 0.20 mm subjected to hydrophilic treatment was used.

上記の通り作製した正極板1、負極板2をポリプロピレン製不織布からなるセパレータ3を介して正極板の側縁部1aと負極板の側縁部2aが相反する方向にセパレータ3から突出するよう渦巻き状に巻回し、直径約30.5mm、高さ約51.5mmの極板群4を作製した。   The positive electrode plate 1 and the negative electrode plate 2 produced as described above are swirled so that the side edge portion 1a of the positive electrode plate and the side edge portion 2a of the negative electrode plate protrude from the separator 3 through the separator 3 made of polypropylene nonwoven fabric. The electrode plate group 4 having a diameter of about 30.5 mm and a height of about 51.5 mm was produced.

図1は実施例1の円筒型蓄電池の構成を示した概略断面図、図4(a)〜(e)は実施例1の円筒型蓄電池の組み立て工程を示した説明図、図6は実施例1の接続端子を示した斜視図である。   FIG. 1 is a schematic cross-sectional view showing the configuration of a cylindrical storage battery of Example 1, FIGS. 4A to 4E are explanatory diagrams showing an assembly process of the cylindrical storage battery of Example 1, and FIG. It is the perspective view which showed 1 connection terminal.

極板群4の上方に突出した正極板の側縁部1aにニッケルメッキした低炭素鋼からなる
板厚0.50mmの上部集電体5を溶接し、下方に突出した負極板の側縁部2aにニッケルメッキした低炭素鋼からなる板厚0.45mmの下部集電体6を抵抗溶接した。図4(a)に示すように、上部集電体5、下部集電体6を抵抗溶接した極板群4を、短絡防止のためのナイロン樹脂製の絶縁リング9とともに、ニッケルメッキした鋼板からなる有底ケース8に収納し、下部集電体6と有底ケース8の底部内面とを抵抗溶接した。次に図4(b)に示すように、有底ケース8を回転させながら、ディスク状の治具を外部より押し当て、極板群4より上部の位置に、溝部8aを形成した後、ナイロン樹脂製のガスケット10dを設置した。さらに、図4(c)に示すように、ニッケルからなる板厚0.40mmの接続端子7を設置した後、この接続端子7の舌片7bと上部集電体5を抵抗溶接した。次に水酸化カリウムを主体としたアルカリ性電解液を上部集電体5に設けた注液口5aより有底ケース8内に注入し、図4(d)に示すように、有底ケース8の開口部に蓋板10a、ゴム弁体10b、キャップ10c、ガスケット10dを備えた封口体10を設置した。次に図4(e)に示すように、有底ケース8上部を内方にかしめて蓋板10aを固定し、蓋板10aと接続端子7の外周部を構成する連結部7aを圧接させて電気的に導通させるとともに、円筒型蓄電池を密閉化した。
An upper current collector 5 made of nickel-plated low carbon steel having a thickness of 0.50 mm is welded to the side edge 1a of the positive electrode plate protruding above the electrode plate group 4, and the side edge of the negative electrode plate protruding downward A lower current collector 6 having a thickness of 0.45 mm made of low carbon steel plated with nickel on 2a was resistance welded. As shown in FIG. 4 (a), the electrode plate group 4 in which the upper current collector 5 and the lower current collector 6 are resistance-welded is made of a nickel-plated steel plate together with an insulating ring 9 made of nylon resin for preventing a short circuit. The bottom current collector 6 and the bottom inner surface of the bottomed case 8 were resistance welded. Next, as shown in FIG. 4B, while rotating the bottomed case 8, a disk-shaped jig is pressed from the outside to form a groove 8 a at a position above the electrode plate group 4, and then nylon A resin gasket 10d was installed. Further, as shown in FIG. 4C, after the connection terminal 7 made of nickel having a thickness of 0.40 mm was installed, the tongue piece 7b of the connection terminal 7 and the upper current collector 5 were resistance-welded. Next, an alkaline electrolyte mainly composed of potassium hydroxide is injected into the bottomed case 8 through the liquid injection port 5a provided in the upper current collector 5, and as shown in FIG. A sealing body 10 provided with a cover plate 10a, a rubber valve body 10b, a cap 10c, and a gasket 10d was installed in the opening. Next, as shown in FIG. 4E, the upper portion of the bottomed case 8 is caulked inward to fix the cover plate 10a, and the cover plate 10a and the connecting portion 7a constituting the outer peripheral portion of the connection terminal 7 are brought into pressure contact with each other. While electrically conducting, the cylindrical storage battery was sealed.

接続端子7は図6に示したように、接続端子7の外周部を構成する連結部7aに放射方向に設けられ内方に突出する先端部が下方に折り曲げられた4個の舌片7bを設けたものを用いた。   As shown in FIG. 6, the connecting terminal 7 includes four tongue pieces 7b that are provided radially in the connecting portion 7a that constitutes the outer peripheral portion of the connecting terminal 7 and whose tip protruding inward is bent downward. The provided one was used.

なお、接続端子7の舌片7bと上部集電体5との溶接は、4個の舌片7bと、上部集電体5の放射方向に設けた4箇所の切れ込みの間の平坦部とをそれぞれ抵抗溶接した。1回の抵抗溶接を2点溶接で行ったため、溶接点は計8点である。   In addition, welding of the tongue piece 7b of the connection terminal 7 and the upper current collector 5 includes four tongue pieces 7b and a flat portion between four cuts provided in the radial direction of the upper current collector 5. Each was resistance welded. Since one resistance welding was performed by two-point welding, the total number of welding points is eight.

このように作製した円筒型ニッケル水素蓄電池を実施例1の電池Aとした。   The cylindrical nickel-metal hydride storage battery thus produced was designated as battery A of Example 1.

図2は実施例2の円筒型蓄電池の構成を示した概略断面図、図5(a)〜(e)は実施例2の円筒型蓄電池の組み立て工程を示した説明図、図7は実施例2の接続端子を示した斜視図である。   FIG. 2 is a schematic cross-sectional view showing the configuration of the cylindrical storage battery of Example 2, FIGS. 5A to 5E are explanatory diagrams showing the assembly process of the cylindrical storage battery of Example 2, and FIG. It is the perspective view which showed 2 connection terminals.

図5(a)〜(e)に示したように、有底ケース8として開口部をあらかじめ拡口して鍔部8cを設け、溝部を形成せず、接続端子7として図7に示したように舌片7bの長さが短い形状のものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例2の電池Bとした。   As shown in FIGS. 5A to 5E, as the bottomed case 8, the opening portion is preliminarily widened to provide the flange portion 8 c, the groove portion is not formed, and the connection terminal 7 is as shown in FIG. 7. A cylindrical nickel-metal hydride storage battery manufactured in the same manner as in Example 1 except that a tongue piece 7b having a short shape was used as Battery B of Example 2.

接続端子7として図10に示したように、舌片7bの先端部に接続端子7の外周部に沿う突片7cを設けたものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例3の電池Cとした。   As shown in FIG. 10, as the connection terminal 7, a cylindrical nickel produced in the same manner as in Example 1 except that the tip of the tongue piece 7b is provided with a protruding piece 7c along the outer periphery of the connection terminal 7. The hydrogen storage battery was designated as battery C of Example 3.

接続端子7として図11に示したように、舌片7bの先端部に接続端子7の外周部に沿う突片7cを設けたものを用いた以外は、鍔部8cを設けた有底ケース8を用いた実施例2と同様に作製した円筒型ニッケル水素蓄電池を実施例4の電池Dとした。   As shown in FIG. 11, as the connection terminal 7, a bottomed case 8 provided with a flange portion 8c is used except that a tip piece of a tongue piece 7b is provided with a projecting piece 7c along the outer periphery of the connection terminal 7. A cylindrical nickel-metal hydride storage battery produced in the same manner as in Example 2 was used as Battery D of Example 4.

なお、実施例3、4では舌片7bの連結部7aに近い舌片7bの根元部分と舌片7bの突片7cの先端部分のほぼ中央の位置で溶接を行った。   In Examples 3 and 4, welding was performed at a substantially central position between the root portion of the tongue piece 7b close to the connecting portion 7a of the tongue piece 7b and the tip portion of the protruding piece 7c of the tongue piece 7b.

接続端子7として図12に示したように、舌片7bを1個設けたものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例5の電池Eとした。   A cylindrical nickel-metal hydride storage battery produced in the same manner as in Example 1 was used as the battery E of Example 5 except that a connection terminal 7 having one tongue piece 7b was used as shown in FIG.

接続端子7として図13に示したように、舌片7bを1個設けたものを用いた以外は、鍔部8cを設けた有底ケース8を用いた実施例2と同様に作製した円筒型ニッケル水素蓄電池を実施例6の電池Fとした。   As shown in FIG. 13, as the connection terminal 7, a cylindrical type produced in the same manner as in Example 2 using the bottomed case 8 provided with the flange 8c except that one provided with one tongue piece 7b was used. The nickel metal hydride storage battery was designated as battery F of Example 6.

なお、実施例7、8では舌片7bの幅が広いため上部集電体5の4箇所の切れ込みのなかで任意の1箇所の切れ込みをまたぐように2点溶接した。   In Examples 7 and 8, since the width of the tongue piece 7b was wide, two-point welding was performed so as to straddle any one notch among the four notches in the upper current collector 5.

接続端子7として図14に示したように、舌片7bを2個設けたものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例7の電池Gとした。   As shown in FIG. 14, the cylindrical nickel-metal hydride storage battery produced in the same manner as in Example 1 was used as the battery G of Example 7, except that a connection terminal 7 having two tongue pieces 7 b was used.

接続端子7として図15に示したように、舌片7bを2個設けたものを用いた以外は、鍔部8cを設けた有底ケース8を用いた実施例2と同様に作製した円筒型ニッケル水素蓄電池を実施例8の電池Hとした。   As shown in FIG. 15, as the connection terminal 7, a cylindrical type manufactured in the same manner as in Example 2 using the bottomed case 8 provided with the flange 8 c except that one provided with two tongue pieces 7 b was used. The nickel metal hydride storage battery was designated as battery H of Example 8.

なお、実施例7、8では実施例5、6と同様に舌片7bの幅が広いため上部集電体5の4箇所の切れ込みのなかで任意の対向する2箇所の切れ込みを、舌片7bがまたぐようにそれぞれ2点溶接した。したがって、溶接点は計4点である。   In the seventh and eighth embodiments, the width of the tongue piece 7b is wide as in the fifth and sixth embodiments. Therefore, any two opposite cuts among the four cuts of the upper current collector 5 can be obtained by using the tongue piece 7b. Two points were welded to each other. Therefore, there are a total of four welding points.

接続端子7として図16に示したように、舌片7bを6個設けたものを用い、上部集電体5として切れ込みを放射方向に6箇所設けたものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例9の電池Iとした。   As shown in FIG. 16, the connection terminal 7 is the same as in Example 1 except that six tongue pieces 7 b are used and the upper current collector 5 is provided with six cuts in the radial direction. The cylindrical nickel-metal hydride storage battery produced in Example 5 was designated as battery I of Example 9.

接続端子7として図17に示したように、舌片7bを6個設けたものを用い、上部集電体5として切れ込みを放射方向に6箇所設けたものを用いた以外は、鍔部8cを設けた有底ケース8を用いた実施例2と同様に作製した円筒型ニッケル水素蓄電池を実施例10の電池Jとした。   As shown in FIG. 17, the connecting terminal 7 is provided with six tongue pieces 7 b, and the upper current collector 5 is provided with a notch provided with six notches in the radial direction. A cylindrical nickel-metal hydride storage battery produced in the same manner as in Example 2 using the provided bottomed case 8 was designated as Battery J in Example 10.

なお、実施例9、10では6個の舌片7bと、上部集電体5の放射方向に設けた6箇所の切れ込みの間の平坦部とをそれぞれ溶接した。したがって、溶接点は計12点である。   In Examples 9 and 10, the six tongue pieces 7b and the flat portions between the six cuts provided in the radial direction of the upper current collector 5 were welded. Therefore, there are a total of 12 welding points.

接続端子7として図18に示したように、舌片7bを8個設けたものを用いた以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を実施例11の電池Kとした。   As shown in FIG. 18, a cylindrical nickel-metal hydride storage battery manufactured in the same manner as in Example 1 was used as the battery K of Example 11, except that a connection terminal 7 having eight tongue pieces 7 b was used.

接続端子7として図19に示したように、舌片7bを8個設けたものを用いた以外は、鍔部8cを設けた有底ケース8を用いた実施例2と同様に作製した円筒型ニッケル水素蓄電池を実施例12の電池Lとした。   As shown in FIG. 19, as the connection terminal 7, a cylindrical type manufactured in the same manner as in Example 2 using the bottomed case 8 provided with the flange portion 8c except that one having 8 tongue pieces 7b was used. The nickel metal hydride storage battery was designated as the battery L of Example 12.

なお、実施例11、12では8個の舌片7bと、上部集電体5の放射方向に設けた4箇所の切れ込みの間の平坦部に舌片7bを2個ずつそれぞれ溶接した。したがって、溶接点は計16点である。   In Examples 11 and 12, eight tongue pieces 7b and two tongue pieces 7b were welded to flat portions between four cuts provided in the radial direction of the upper current collector 5, respectively. Therefore, the total number of welding points is 16.

(比較例1)
図8は比較例1の円筒型蓄電池の構成を示した概略断面図である。
(Comparative Example 1)
FIG. 8 is a schematic cross-sectional view showing the configuration of the cylindrical storage battery of Comparative Example 1.

実施例1の電池Aと同様に極板群を作製し、図8に示したように、接続端子の代わりに従来の矩形のタブ端子17を用い、このタブ端子17の上端と封口体20の下面とをレーザー溶接して電気的に接続した以外は実施例1と同様に作製した円筒型ニッケル水素蓄電池を比較例1の電池Mとした。   An electrode plate group was prepared in the same manner as the battery A of Example 1, and as shown in FIG. 8, a conventional rectangular tab terminal 17 was used instead of the connection terminal, and the upper end of the tab terminal 17 and the sealing body 20 A cylindrical nickel-metal hydride storage battery produced in the same manner as in Example 1 except that the lower surface was electrically connected by laser welding was designated as Battery M of Comparative Example 1.

以上の実施例1〜12および比較例1で作製した電池A〜Mに対し、600mAで15時間充電後、6000mAで40分間放電する充放電サイクルを25℃雰囲気下で2回行い、その後、45℃雰囲気下で3日間保存し、負極板の活性化を行った。さらに6000mAにて1.0Vまで放電後、6000mAにて66分充電する充放電サイクルを25℃雰囲気下で10回繰り返し、負極板の活性化を行った。   For the batteries A to M produced in Examples 1 to 12 and Comparative Example 1 described above, a charge / discharge cycle of charging at 600 mA for 15 hours and then discharging at 6000 mA for 40 minutes was performed twice in a 25 ° C. atmosphere. The negative electrode plate was activated by storing for 3 days in an atmosphere of ° C. Furthermore, after discharging to 6000 mA to 1.0 V, a charge / discharge cycle of charging at 6000 mA for 66 minutes was repeated 10 times in a 25 ° C. atmosphere to activate the negative electrode plate.

<直流抵抗の評価>
各電池を6000mAにて1.0Vまで放電後、600mAにて5時間充電した。これら各電池を30分間放置した後、以下に示す充放電サイクルを25℃雰囲気下で行った。
<Evaluation of DC resistance>
Each battery was discharged to 1.0 V at 6000 mA and then charged at 600 mA for 5 hours. After each of these batteries was left for 30 minutes, the following charge / discharge cycle was performed in an atmosphere at 25 ° C.

第1サイクル:放電6000mA×20秒、休止5分、充電6000mA×20秒、休止5分
第2サイクル:放電18000mA×20秒、休止5分、充電18000mA×20秒、休止5分
第3サイクル:放電36000mA×20秒、休止5分、充電36000mA×20秒、休止5分
第4サイクル:放電60000mA×20秒、休止5分、充電60000mA×20秒、休止5分
この4回の放電の設定電流と10秒後の電圧から最小2乗法により近似直線を求め、その傾きを直流抵抗とし、HEV用途における出力特性の代用値とした。評価は各3セル行い、その平均値を(表1)に示した。
First cycle: Discharge 6000 mA × 20 seconds, pause 5 minutes, charge 6000 mA × 20 seconds, pause 5 minutes Second cycle: Discharge 18000 mA × 20 seconds, pause 5 minutes, charge 18000 mA × 20 seconds, pause 5 minutes Third cycle: Discharge 36000 mA × 20 seconds, rest 5 minutes, charge 36000 mA × 20 seconds, rest 5 minutes Fourth cycle: discharge 60000 mA × 20 seconds, rest 5 minutes, charge 60000 mA × 20 seconds, rest 5 minutes Set current for these four discharges An approximate straight line was obtained from the voltage after 10 seconds by the method of least squares, and the slope thereof was defined as a DC resistance, which was used as a substitute value for output characteristics in HEV applications. The evaluation was performed for 3 cells, and the average value is shown in (Table 1).

Figure 2008243811
Figure 2008243811

(表1)に示したように、本発明の接続端子7を用いた実施例1の電池A、実施例2の電池Bは比較例1の電池Mより小さい直流抵抗を示すことがわかった。   As shown in (Table 1), it was found that the battery A of Example 1 and the battery B of Example 2 using the connection terminal 7 of the present invention showed a DC resistance smaller than that of the battery M of Comparative Example 1.

これは、電池A、電池Bの接続端子7は電池Mのタブ端子17より短く、また、接続端子7の舌片7bの総幅も広いため、直流抵抗が小さくなったと考えられる。   This is probably because the connection terminals 7 of the batteries A and B are shorter than the tab terminal 17 of the battery M, and the total width of the tongue 7b of the connection terminal 7 is wide, so that the DC resistance is reduced.

また、電池Bの直流抵抗は電池Aよりも小さくなることがわかった。   Further, it was found that the direct current resistance of the battery B was smaller than that of the battery A.

これは、電池Bは有底ケース8に鍔部8cを設けることによって接続端子7をより短くできたためと考えられる。   This is presumably because the battery B can shorten the connection terminal 7 by providing the bottom portion 8 with the flange portion 8c.

同様に、電池C〜Lのいずれについても、比較例1の電池Mより小さい直流抵抗を示すことがわかった。   Similarly, it was found that any of the batteries C to L exhibited a DC resistance smaller than that of the battery M of Comparative Example 1.

これは、電池C〜Lの接続端子7はいずれも、電池Mのタブ端子17より短く、また、接続端子7の舌片7bの総幅も広いため、直流抵抗が小さくなったと考えられる。   This is probably because the connection terminals 7 of the batteries C to L are shorter than the tab terminal 17 of the battery M, and the total width of the tongue pieces 7b of the connection terminal 7 is wide, so that the DC resistance is reduced.

また、電池Aと電池B、電池Cと電池D、電池Eと電池F、電池Gと電池H、電池Iと電池J、電池Kと電池Lをそれぞれ比較すると、電池B、電池D、電池F、電池H、電池J、電池Lのほうが直流抵抗が小さくなることがわかった。これは、有底ケース8に鍔部8cを設けることによって接続端子7をより短くできたためと考えられる。   In addition, when comparing battery A and battery B, battery C and battery D, battery E and battery F, battery G and battery H, battery I and battery J, battery K and battery L, battery B, battery D, and battery F, respectively. It was found that the direct current resistance was smaller in the battery H, the battery J, and the battery L. This is considered to be because the connection terminal 7 can be made shorter by providing the flange portion 8c in the bottomed case 8.

また、本発明の電池E(舌片7b:1個)、電池G(舌片7b:2個)、電池A(舌片7b:4個)、電池I(舌片7b:6個)、電池K(舌片7b:8個)は、いずれも比較例1の電池Kより小さい直流抵抗を示し、舌片7bを2個以上設けた電池G、電池A、電池I、電池Kは特に直流抵抗が小さくなることがわかった。これは、接続端子7の舌片7bを増やすことで舌片7bの総幅が広くなったためと考えられる。また、舌片7bが6個以下である電池E、電池G、電池A、電池Iは溶接回数が接続端子溶接工程において十分
に少なく、短時間で溶接することができた。したがって、舌片7bの数は2個から6個が特に望ましいことがわかった。
Also, the battery E (tongue piece 7b: 1 piece), battery G (tongue piece 7b: 2 pieces), battery A (tongue piece 7b: 4 pieces), battery I (tongue piece 7b: 6 pieces), battery of the present invention K (tongue piece 7b: 8 pieces) all show a direct current resistance smaller than that of the battery K of Comparative Example 1, and the batteries G, battery A, battery I, and battery K provided with two or more tongue pieces 7b are particularly direct current resistances. Was found to be smaller. This is presumably because the total width of the tongue piece 7b is increased by increasing the number of tongue pieces 7b of the connection terminal 7. Moreover, the battery E, the battery G, the battery A, and the battery I in which the number of tongue pieces 7b is 6 or less were sufficiently small in the number of times of welding in the connection terminal welding process, and could be welded in a short time. Therefore, it was found that the number of tongue pieces 7b is particularly preferably 2 to 6.

また、電池C、電池Dについては、舌片7bの先端部が外周部に沿って伸びた突片7cを設けているため、舌片7b上の溶接位置を変えることで容易に、極板群4の高さに対応できることがわかった。   Further, for the batteries C and D, since the tip 7b of the tongue piece 7b is provided with a protruding piece 7c extending along the outer peripheral portion, the electrode plate group can be easily changed by changing the welding position on the tongue piece 7b. It was found that the height of 4 could be accommodated.

本発明による電池は従来の電池に比べ、直流抵抗を小さくすることができるため、電気自動車など、大電流放電を要する機器に対して有用である。   Since the battery according to the present invention can reduce the direct current resistance as compared with a conventional battery, it is useful for an apparatus that requires a large current discharge, such as an electric vehicle.

本発明の円筒型蓄電池の構成を示した概略断面図Schematic sectional view showing the configuration of the cylindrical storage battery of the present invention 本発明の円筒型蓄電池の他の構成を示した概略断面図Schematic sectional view showing another configuration of the cylindrical storage battery of the present invention (a)本発明の円筒型蓄電池に用いた極板群の構成を示した斜視図、(b)本発明の円筒型蓄電池に用いた極板群と上部集電体および下部集電体の構成を示した斜視図(A) The perspective view which showed the structure of the electrode group used for the cylindrical storage battery of this invention, (b) The structure of the electrode group used for the cylindrical storage battery of this invention, an upper collector, and a lower collector A perspective view showing (a)本発明の円筒型蓄電池の極板群挿入工程を示した説明図、(b)本発明の円筒型蓄電池のガスケット挿入工程を示した説明図、(c)本発明の円筒型蓄電池の接続端子溶接工程を示した説明図、(d)本発明の円筒型蓄電池の封口体設置工程を示した説明図、(e)本発明の円筒型蓄電池のかしめ工程を示した説明図(A) Explanatory drawing which showed the electrode plate group insertion process of the cylindrical storage battery of this invention, (b) Explanatory drawing which showed the gasket insertion process of the cylindrical storage battery of this invention, (c) of the cylindrical storage battery of this invention Explanatory drawing showing the connection terminal welding process, (d) Explanatory drawing showing the sealing body installation step of the cylindrical storage battery of the present invention, (e) Explanatory drawing showing the caulking process of the cylindrical storage battery of the present invention (a)本発明の他の構成の円筒型蓄電池の極板群挿入工程を示した説明図、(b)本発明の他の構成の円筒型蓄電池のガスケット挿入工程を示した説明図、(c)本発明の他の構成の円筒型蓄電池の接続端子溶接を示した説明図、(d)本発明の他の構成の円筒型蓄電池の封口体設置を示した説明図、(e)本発明の他の構成の円筒型蓄電池のかしめ工程を示した説明図(A) Explanatory drawing which showed the electrode group insertion process of the cylindrical storage battery of the other structure of this invention, (b) Explanatory drawing which showed the gasket insertion process of the cylindrical storage battery of the other structure of this invention, (c) ) An explanatory diagram showing the connection terminal welding of a cylindrical storage battery of another configuration of the present invention, (d) an explanatory diagram showing installation of a sealing body of a cylindrical storage battery of another configuration of the present invention, (e) Explanatory drawing which showed the caulking process of the cylindrical storage battery of another structure 本発明の実施例1の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 1 of this invention 本発明の実施例2の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 2 of this invention 従来の円筒型蓄電池の構成を示した概略断面図Schematic sectional view showing the configuration of a conventional cylindrical storage battery 従来の円筒型蓄電池の他の構成を示した概略断面図Schematic sectional view showing another configuration of a conventional cylindrical battery 本発明の実施例3の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 3 of this invention 本発明の実施例4の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 4 of this invention 本発明の実施例5の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 5 of this invention 本発明の実施例6の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 6 of this invention 本発明の実施例7の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 7 of this invention 本発明の実施例8の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 8 of this invention 本発明の実施例9の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 9 of this invention 本発明の実施例10の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 10 of this invention 本発明の実施例11の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 11 of this invention 本発明の実施例12の接続端子を示した斜視図The perspective view which showed the connecting terminal of Example 12 of this invention

符号の説明Explanation of symbols

1 正極板
1a 正極板の側縁部
2 負極板
2a 負極板の側縁部
3 セパレータ
4 極板群
5 上部集電体
5a 注液口
6 下部集電体
7 接続端子
7a 連結部
7b 舌片
7c 突片
8 有底ケース
8a 溝部
8b 支持部
8c 鍔部
9 絶縁リング
10 封口体
10a 蓋板
10b ゴム弁体
10c キャップ
10d ガスケット
DESCRIPTION OF SYMBOLS 1 Positive electrode plate 1a Side edge part of positive electrode plate 2 Negative electrode plate 2a Side edge part of negative electrode plate 3 Separator 4 Electrode plate group 5 Upper collector 5a Injection port 6 Lower collector 7 Connection terminal 7a Connecting part 7b Tongue piece 7c Projection piece 8 Bottomed case 8a Groove portion 8b Support portion 8c Gutter portion 9 Insulating ring 10 Sealing body 10a Cover plate 10b Rubber valve body 10c Cap 10d Gasket

Claims (5)

帯状の正極板と負極板とをセパレータを介して積層または渦巻状に巻回してなる極板群と電解液とを内部に収納した一方の外部端子を兼ねた有底ケースと、この有底ケースの上端部の開口部をかしめ封口により密閉する他方の外部端子を兼ねた封口体と、この封口体と前記極板群の一方の極板溶接した上部集電体とを電気的に接続する接続端子を備えた電池であって、
前記接続端子の外周部の一部分と封口体の一部分とをかしめ封口により電気的に接続した電池。
A bottomed case that also serves as one external terminal containing an electrode plate group and an electrolyte solution, each of which is formed by laminating a strip-like positive electrode plate and a negative electrode plate via a separator or winding them in a spiral shape, and this bottomed case A sealing body that also serves as the other external terminal that seals the opening at the upper end of the sealing member by caulking and electrically connects the sealing body and an upper current collector welded to one electrode plate of the electrode plate group A battery having a connection terminal,
A battery in which a part of an outer peripheral portion of the connection terminal and a part of a sealing body are electrically connected by caulking.
前記接続端子の外周部を構成する連結部に放射方向に設けられ内方に突出する先端部が下方に折り曲げられた複数個の舌片を設けた請求項1に記載の電池。   2. The battery according to claim 1, wherein a plurality of tongue pieces are provided in a connecting portion that constitutes an outer peripheral portion of the connection terminal, and a plurality of tongue pieces that are bent in a downward direction are provided in a radial direction. 前記有底ケースの上端部の開口部に外方に突出する鍔部を設け、この鍔部に設置した封口体を鍔部の周縁部の屈曲部でかしめ封口した請求項1または2に記載の電池。   The flange part which protrudes outward is provided in the opening part of the upper end part of the said bottomed case, The sealing body installed in this collar part is crimped and sealed by the bending part of the peripheral part of the collar part. battery. 2〜6個の舌片を設けた請求項2または3に記載の電池。   The battery according to claim 2 or 3, wherein 2 to 6 tongue pieces are provided. 舌片の先端部に接続端子の外周部に沿う突片を設けた請求項2または3に記載の電池。


The battery according to claim 2 or 3, wherein a protruding piece along the outer peripheral portion of the connection terminal is provided at the tip of the tongue piece.


JP2008047050A 2007-02-28 2008-02-28 Battery Pending JP2008243811A (en)

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