JP5991168B2 - Power storage device and method for manufacturing power storage device - Google Patents
Power storage device and method for manufacturing power storage device Download PDFInfo
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- JP5991168B2 JP5991168B2 JP2012259678A JP2012259678A JP5991168B2 JP 5991168 B2 JP5991168 B2 JP 5991168B2 JP 2012259678 A JP2012259678 A JP 2012259678A JP 2012259678 A JP2012259678 A JP 2012259678A JP 5991168 B2 JP5991168 B2 JP 5991168B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本発明は蓄電装置及び蓄電装置の製造方法に関する。 The present invention relates to a power storage device and a method for manufacturing the power storage device .
ＥＶ（Ｅｌｅｃｔｒｉｃ Ｖｅｈｉｃｌｅ）やＰＨＶ（Ｐｌｕｇ ｉｎ Ｈｙｂｒｉｄ Ｖｅｈｉｃｌｅ）などの車両には、走行用モータへの供給電力を蓄える蓄電装置としての二次電池が搭載されている。二次電池は、例えば端部にタブが突出して設けられた電極を備えている。また、二次電池は、タブと溶接されているとともに、ケースに設けられた端子と電気的に接続されている導電部材を備えている。ここで、導電部材とタブとの溶接態様として、例えば特許文献１には、導電部材と溶接される箇所のタブの形状を非直線状にすることが記載されている。 A vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is equipped with a secondary battery as a power storage device that stores power supplied to the traveling motor. The secondary battery includes, for example, an electrode provided with a tab protruding at an end. Further, the secondary battery includes a conductive member that is welded to the tab and is electrically connected to a terminal provided in the case. Here, as a welding mode between the conductive member and the tab, for example, Patent Document 1 describes that the shape of the tab where the conductive member is welded is made non-linear.
ところで、タブと導電部材との溶接を行う場合、溶接対象箇所に対して熱を付与する必要がある。この場合、溶接に係る熱が拡散すると、溶接不良が生じ得る。
本発明は、上述した事情を鑑みてなされたものであり、タブと導電部材との溶接を好適に行うことが可能な蓄電装置及び蓄電装置の製造方法を提供することを目的とする。
By the way, when welding a tab and an electrically-conductive member, it is necessary to provide heat with respect to a welding object location. In this case, if heat related to welding diffuses, poor welding may occur.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a power storage device and a method for manufacturing the power storage device capable of suitably performing welding between a tab and a conductive member.
上記目的を達成するために、本発明は、端部にタブが設けられた電極と、前記タブと溶接されているとともに、前記電極が収容されるケースに設けられた端子と電気的に接続されている板状の導電部材と、を備えた蓄電装置において、前記電極は、セパレータを介した状態で複数積層されており、前記導電部材は、幅が相違する幅広部及び幅狭部を有し、前記導電部材と複数の前記タブとは、タブ同士のみが溶接された溶接箇所を有することなく同一の溶接箇所をもって溶接されており、前記導電部材と前記タブとの溶接箇所の少なくとも一部は、前記幅狭部にあり、前記幅狭部は、前記導電部材においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端を構成しており、前記導電部材の厚さ方向から見て、前記幅広部と前記タブとは重なった状態で接触していることを特徴とする。 In order to achieve the above object, the present invention provides an electrode having a tab provided at an end thereof, and is electrically connected to a terminal that is welded to the tab and provided in a case in which the electrode is accommodated. A plurality of the electrodes are stacked with a separator interposed therebetween, and the conductive member has a wide portion and a narrow portion having different widths. The conductive member and the plurality of tabs are welded at the same welding location without having a welding location where only the tabs are welded, and at least a part of the welding location between the conductive member and the tab is The narrow portion is configured to constitute one end of the conductive member positioned in a direction orthogonal to both the width direction and the thickness direction of the conductive member, as viewed from the thickness direction of the conductive member. The wide portion and the tab Characterized in that in contact with overlapped state and.
かかる発明によれば、導電部材とタブとの溶接箇所の少なくとも一部が幅狭部にあるため、溶接箇所全体が幅広部にある構成と比較して、溶接に係る熱が付与された場合に、その熱が拡散しにくい。これにより、タブと導電部材との溶接を好適に行うことができる。 According to this invention, since at least a part of the welded portion between the conductive member and the tab is in the narrow portion, compared to the configuration in which the entire welded portion is in the wide portion, when heat related to welding is applied. The heat is difficult to diffuse. Thereby, welding with a tab and a conductive member can be performed suitably.
また、溶接に係る熱の拡散が一方向に限定されるため、より好適に熱拡散を抑制することができる。 Moreover , since heat diffusion related to welding is limited to one direction, it is possible to more suitably suppress heat diffusion.
好適な例では、前記幅狭部における幅方向の中央と、前記幅広部の幅方向の中央とは、前記導電部材の幅方向において一致する。かかる構成によれば、溶接の際に、幅狭部をその厚さ方向から押圧する場合に、導電部材の位置が安定する。これにより、タブと導電部材との溶接を、より好適に行うことができる。 In a preferred example, the center in the width direction of the narrow portion and the center in the width direction of the wide portion coincide with each other in the width direction of the conductive member. According to such a configuration, the position of the conductive member is stabilized when the narrow portion is pressed from the thickness direction during welding. Thereby, welding with a tab and a conductive member can be performed more suitably.
好適な例では、前記溶接箇所は、前記幅狭部のみにある。かかる構成によれば、溶接に係る熱の拡散を、より抑制することができる。これにより、タブと導電部材の溶接を、より好適に行うことができる。 In a preferred example, the weld location is only in the narrow portion. According to such a configuration, heat diffusion related to welding can be further suppressed. Thereby, welding of a tab and a conductive member can be performed more suitably.
好適な例では、前記電極は負極電極である。一般的に正極電極に設けられるタブにはアルミニウムが用いられ、負極電極に設けられるタブには銅が用いられる。この場合、銅はアルミニウムよりも抵抗が低いため、溶接に係る電力等が付与された場合に、その電力等がジュール熱に変換されにくい。このため、負極電極のタブと導電部材の方が、正極電極のタブと導電部材よりも、溶接不良が発生し易い。 In a preferred example, the electrode is a negative electrode. Generally, aluminum is used for the tab provided on the positive electrode, and copper is used for the tab provided on the negative electrode. In this case, since copper has a lower resistance than aluminum, when electric power or the like related to welding is applied, the electric power or the like is not easily converted to Joule heat. For this reason, the negative electrode tab and the conductive member are more likely to cause poor welding than the positive electrode tab and the conductive member.
これに対して、上記のように幅狭部を設け、その幅狭部にて溶接を行う構成を採用することにより、正極側よりも問題となり易い負極側のタブと導電部材との溶接を好適に行うことができる。 In contrast, by adopting a configuration in which a narrow portion is provided and welding is performed at the narrow portion as described above, welding between the tab on the negative electrode side and the conductive member, which is more problematic than the positive electrode side, is preferable. Can be done.
好適な例では、蓄電装置は二次電池である。
上記目的を達成するために、本発明は、端部にタブが設けられた電極と、前記タブと溶接されているとともに、前記電極が収容されるケースに設けられた端子と電気的に接続されている板状の導電部材と、を備えた蓄電装置の製造方法において、前記電極を、セパレータを介して複数積層し、複数の前記タブを前記電極の積層方向の一端側に集め、幅が相違する幅広部及び幅狭部を有する導電部材であって、前記幅狭部は、前記導電部材においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端を構成している導電部材の厚さ方向から見て、前記幅広部及び前記幅狭部と前記タブとが重なるように配置し、前記タブ同士のみを溶接することなく、前記幅狭部と前記タブとを溶接することを特徴とする。
In a preferred example, the power storage device is a secondary battery.
In order to achieve the above object, the present invention provides an electrode having a tab provided at an end thereof, and is electrically connected to a terminal that is welded to the tab and provided in a case in which the electrode is accommodated. A plurality of the electrodes are stacked via a separator, and the plurality of tabs are gathered on one end side in the stacking direction of the electrodes, and the widths are different. A conductive member having a wide part and a narrow part , wherein the narrow part is an end of the conductive member constituting one end of the conductive member positioned in a direction perpendicular to both the width direction and the thickness direction . The wide portion and the narrow portion and the tab are arranged so as to overlap each other when viewed from the thickness direction, and the narrow portion and the tab are welded without welding only the tabs. And
この発明によれば、タブと導電部材との溶接を好適に行うことができる。 According to this invention, the tab and the conductive member can be suitably welded.
以下、本発明に係る蓄電装置の一実施形態を図１〜図７を用いて説明する。
図１及び図２に示すように、蓄電装置としての二次電池１０は、その外形を構成するケース１１を備えている。ケース１１は、四角箱状の容器１２と、その容器１２に設けられた開口部分を塞ぐ矩形平板状の蓋１３とから構成されている。このため、二次電池１０は、その外形が角型の角型電池である。なお、容器１２及び蓋１３は金属製である。また、本実施形態の二次電池１０は、リチウムイオン電池である。
Hereinafter, an embodiment of a power storage device according to the present invention will be described with reference to FIGS.
As shown in FIG.1 and FIG.2, the secondary battery 10 as an electrical storage apparatus is provided with the case 11 which comprises the external shape. The case 11 includes a rectangular box-shaped container 12 and a rectangular flat lid 13 that closes an opening provided in the container 12. For this reason, the secondary battery 10 is a square battery whose outer shape is a square. The container 12 and the lid 13 are made of metal. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.
二次電池１０は、ケース１１に収容されている電極組立体１４と、電極組立体１４と電力のやり取りを行うのに用いられる正極端子１５及び負極端子１６とを備えている。各端子１５，１６はケース１１、詳細には蓋１３に取り付けられている。正極端子１５は、絶縁リング１７によって絶縁された状態で蓋１３を貫通しており、正極端子１５の一部はケース１１外に露出し、別の一部はケース１１内にある。同様に、負極端子１６は、絶縁リング１７によって絶縁された状態でケース１１を貫通している。これにより、各端子１５，１６は、ケース１１外からアクセス可能となっている。 The secondary battery 10 includes an electrode assembly 14 housed in a case 11, and a positive electrode terminal 15 and a negative electrode terminal 16 that are used to exchange power with the electrode assembly 14. The terminals 15 and 16 are attached to the case 11, specifically the lid 13. The positive electrode terminal 15 penetrates the lid 13 while being insulated by the insulating ring 17, a part of the positive electrode terminal 15 is exposed outside the case 11, and another part is inside the case 11. Similarly, the negative electrode terminal 16 penetrates the case 11 while being insulated by the insulating ring 17. Thus, the terminals 15 and 16 can be accessed from outside the case 11.
図３に示すように、電極組立体１４は、電極としての正極電極２１及び負極電極２２が、電気伝導に係るイオン（リチウムイオン）が通過可能な多孔質膜で形成されたセパレータ２３を介して交互に積層されて構成されている。各電極２１，２２及びセパレータ２３はそれぞれ、矩形のシート状である。 As shown in FIG. 3, the electrode assembly 14 includes a positive electrode 21 and a negative electrode 22 serving as electrodes via a separator 23 formed of a porous film through which ions (lithium ions) related to electric conduction can pass. It is configured by alternately stacking. Each of the electrodes 21 and 22 and the separator 23 has a rectangular sheet shape.
正極電極２１は、矩形状の正極金属箔（例えばアルミニウム箔）２１ａと、当該正極金属箔２１ａの両面全体に設けられた正極活物質層２１ｂと、を有する。負極電極２２は、矩形状の負極金属箔（例えば銅箔）２２ａと、当該負極金属箔２２ａの両面全体に設けられた負極活物質層２２ｂと、を有する。電極組立体１４を構成している状態において、正極活物質層２１ｂは負極活物質層２２ｂによって覆われ、且つ、各電極２１，２２はセパレータ２３によって覆われている。 The positive electrode 21 includes a rectangular positive metal foil (for example, aluminum foil) 21 a and a positive electrode active material layer 21 b provided on both surfaces of the positive metal foil 21 a. The negative electrode 22 has a rectangular negative metal foil (for example, copper foil) 22a and a negative electrode active material layer 22b provided on both surfaces of the negative metal foil 22a. In the state constituting the electrode assembly 14, the positive electrode active material layer 21 b is covered with the negative electrode active material layer 22 b, and the electrodes 21 and 22 are covered with the separator 23.
図３に示すように、正極電極２１の端部２１ｃには、正極タブ３１が突出して設けられている。正極タブ３１は、端部２１ｃから、正極金属箔２１ａの一部が突出することによって形成されている。 As shown in FIG. 3, a positive electrode tab 31 protrudes from the end 21 c of the positive electrode 21. The positive electrode tab 31 is formed by protruding a part of the positive electrode metal foil 21a from the end portion 21c.
同様に、負極電極２２の端部２２ｃには、負極タブ３２が突出して設けられている。負極タブ３２は、端部２２ｃから、負極金属箔２２ａの一部が突出することによって形成されている。負極タブ３２は、負極タブ３２の突出方向と直交する方向に幅を有している。突出方向と直交する方向は、負極電極２２の端部２２ｃに沿う方向とも言える。 Similarly, a negative electrode tab 32 protrudes from the end 22 c of the negative electrode 22. The negative electrode tab 32 is formed by protruding a part of the negative electrode metal foil 22a from the end 22c. The negative electrode tab 32 has a width in a direction orthogonal to the protruding direction of the negative electrode tab 32. It can be said that the direction orthogonal to the protruding direction is a direction along the end 22 c of the negative electrode 22.
各電極２１，２２は、各タブ３１，３２の同一極性同士が積層方向に列状に配置される一方、異なる極性同士が積層方向に並ばないように重なっている。そして、図１に示すように、各負極タブ３２は、電極組立体１４の積層方向の一端側に寄せて集められ、その集められた状態で上記一端側とは反対側の他端側に向けて折り返されている。同様に、各正極タブ３１は、電極組立体１４の積層方向の一端側に集められた状態で、上記一端側とは反対側の他端側に向けて折り返されている。そして、電極組立体１４は、各タブ３１，３２がある部位と、各端子１５，１６が設けられている蓋１３とが対向する状態でケース１１内に収容されている。 The electrodes 21 and 22 are overlapped so that the same polarities of the tabs 31 and 32 are arranged in a row in the stacking direction, while different polarities are not aligned in the stacking direction. As shown in FIG. 1, each negative electrode tab 32 is gathered toward one end side in the stacking direction of the electrode assembly 14, and in the gathered state, toward the other end side opposite to the one end side. Is folded. Similarly, each positive electrode tab 31 is folded toward the other end side opposite to the one end side in a state where the positive electrode tabs 31 are gathered on one end side in the stacking direction of the electrode assembly 14. The electrode assembly 14 is accommodated in the case 11 in a state where the portion where the tabs 31 and 32 are located and the lid 13 provided with the terminals 15 and 16 face each other.
図１に示すように、二次電池１０は、各タブ３１，３２と各端子１５，１６との同一極性同士を電気的に接続する正極導電部材４１及び負極導電部材４２を備えている。正極導電部材４１は、金属（例えばアルミニウム）で構成されており、正極タブ３１に溶接されているとともに、正極端子１５と電気的に接続されている。負極導電部材４２は、金属（例えば銅）で構成されており、負極タブ３２に溶接されているとともに、負極端子１６と電気的に接続されている。これにより、各端子１５，１６にアクセスすることにより、電極組立体１４の電力をケース１１外に取り出すことができるとともに、電極組立体１４に対して電力を付与することが可能となっている。 As shown in FIG. 1, the secondary battery 10 includes a positive electrode conductive member 41 and a negative electrode conductive member 42 that electrically connect the same polarities of the tabs 31 and 32 and the terminals 15 and 16. The positive electrode conductive member 41 is made of metal (for example, aluminum), is welded to the positive electrode tab 31, and is electrically connected to the positive electrode terminal 15. The negative electrode conductive member 42 is made of metal (for example, copper), is welded to the negative electrode tab 32, and is electrically connected to the negative electrode terminal 16. Thereby, by accessing each of the terminals 15 and 16, the electric power of the electrode assembly 14 can be taken out of the case 11, and the electric power can be applied to the electrode assembly 14.
次に、負極タブ３２と負極導電部材４２との溶接態様について、負極導電部材４２の詳細な構成と合わせて説明する。なお、正極タブ３１と正極導電部材４１との溶接態様は、負極タブ３２と負極導電部材４２との溶接態様と同様であるため、その詳細な説明を省略する。 Next, the welding mode between the negative electrode tab 32 and the negative electrode conductive member 42 will be described together with the detailed configuration of the negative electrode conductive member 42. In addition, since the welding aspect of the positive electrode tab 31 and the positive electrode conductive member 41 is the same as the welding aspect of the negative electrode tab 32 and the negative electrode conductive member 42, the detailed description is abbreviate | omitted.
図４に示すように、負極導電部材４２は全体として板状であり、その厚さは負極タブ３２の厚さよりも厚い。負極導電部材４２は、厚さ方向に直交する両板面４２ａ，４２ｂのうち負極タブ３２側にあるタブ側板面４２ａが負極タブ３２と接触した状態で取り付けられている。なお、タブ側板面４２ａと接触している負極タブ３２は、負極タブ３２が重なって構成された負極タブ群Ｇの最外層を構成するものである。 As shown in FIG. 4, the negative electrode conductive member 42 has a plate shape as a whole, and the thickness thereof is larger than the thickness of the negative electrode tab 32. The negative electrode conductive member 42 is attached in a state in which the tab side plate surface 42 a on the negative electrode tab 32 side of both plate surfaces 42 a and 42 b orthogonal to the thickness direction is in contact with the negative electrode tab 32. The negative electrode tab 32 in contact with the tab side plate surface 42a constitutes the outermost layer of the negative electrode tab group G formed by overlapping the negative electrode tabs 32.
負極導電部材４２が取り付けられている状態において、負極導電部材４２の厚さ方向と、負極タブ３２の突出方向に沿う方向とは一致している。ここで、電極組立体１４の積層方向と一致する方向を、負極導電部材４２の幅方向とする。なお、負極導電部材４２の幅方向は、負極タブ３２の幅方向と直交している方向である。 In the state where the negative electrode conductive member 42 is attached, the thickness direction of the negative electrode conductive member 42 and the direction along the protruding direction of the negative electrode tab 32 coincide. Here, a direction coinciding with the stacking direction of the electrode assembly 14 is a width direction of the negative electrode conductive member 42. The width direction of the negative electrode conductive member 42 is a direction orthogonal to the width direction of the negative electrode tab 32.
図５に示すように、負極導電部材４２は、幅が相違する幅広部５１及び幅狭部５２を有している。幅狭部５２は、負極導電部材４２においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端４２ｃを構成している。また、幅狭部５２における幅方向の中央と、幅広部５１の幅方向の中央とは、負極導電部材４２の幅方向において一致する。つまり、幅狭部５２は、幅広部５１の幅方向の中央に配置されている。幅狭部５２は、幅広部５１の幅方向と直交する方向の端部の中央から延出している。また、幅狭部５２における幅広部５１側の部位は、負極導電部材４２の幅方向の端部から中央に向けて凸となるように湾曲している。 As shown in FIG. 5, the negative electrode conductive member 42 has a wide portion 51 and a narrow portion 52 having different widths. The narrow portion 52 constitutes one end 42 c located in the direction perpendicular to both the width direction and the thickness direction of the negative electrode conductive member 42. Further, the center in the width direction of the narrow portion 52 and the center in the width direction of the wide portion 51 coincide with each other in the width direction of the negative electrode conductive member 42. That is, the narrow portion 52 is disposed at the center in the width direction of the wide portion 51. The narrow portion 52 extends from the center of the end in the direction orthogonal to the width direction of the wide portion 51. Further, the portion of the narrow portion 52 on the wide portion 51 side is curved so as to protrude from the end in the width direction of the negative electrode conductive member 42 toward the center.
なお、幅狭部５２を形成する手法は任意であるが、例えば長方形状の金属板の一部を切り欠く手法や、負極導電部材４２の形状となった金型を用いて打ち抜く手法等が考えられる。 Although the method for forming the narrow portion 52 is arbitrary, for example, a method of notching a part of a rectangular metal plate, a method of punching using a mold having the shape of the negative electrode conductive member 42, or the like is considered. It is done.
図５及び図６に示すように、負極導電部材４２は、その厚さ方向から見て、幅狭部５２と負極タブ３２とが重なるように配置されている。この場合、負極導電部材４２の厚さ方向から見て、幅狭部５２は負極タブ３２の幅方向の中央に配置されている。また、負極導電部材４２の厚さ方向から見て、幅狭部５２は、全負極タブ３２の重なり部分と重なっている（図６参照）。 As shown in FIGS. 5 and 6, the negative electrode conductive member 42 is disposed so that the narrow portion 52 and the negative electrode tab 32 overlap each other when viewed in the thickness direction. In this case, the narrow portion 52 is disposed at the center of the negative electrode tab 32 in the width direction when viewed from the thickness direction of the negative electrode conductive member 42. Further, when viewed from the thickness direction of the negative electrode conductive member 42, the narrow portion 52 overlaps the overlapping portion of all the negative electrode tabs 32 (see FIG. 6).
ここで、図５及び図６に示すように、幅狭部５２にて負極タブ３２と負極導電部材４２とが溶接されている。つまり、負極タブ３２と負極導電部材４２との溶接箇所Ｐは、幅狭部５２のみにある。 Here, as shown in FIGS. 5 and 6, the negative electrode tab 32 and the negative electrode conductive member 42 are welded at the narrow portion 52. That is, the welded portion P between the negative electrode tab 32 and the negative electrode conductive member 42 is only in the narrow portion 52.
次に負極タブ３２と負極導電部材４２との溶接工程について説明する。
図７に示すように、負極タブ３２が電極組立体１４の積層方向の一端側に集められた状態で、幅狭部５２が負極タブ３２に接触するように負極導電部材４２を配置する。そして、一対の溶接用電極棒Ｗ１，Ｗ２を用いて、各負極タブ３２と負極導電部材４２とを挟みこむ。この場合、負極導電部材４２側の溶接用電極棒Ｗ１は、幅狭部５２と接触している。また、負極タブ３２側の溶接用電極棒Ｗ２は、当て板Ｗ３を介して、各負極タブ３２を押圧している。そして、その状態にて、一対の溶接用電極棒Ｗ１，Ｗ２間に溶接に係る電力を付与する。これにより、各負極タブ３２同士が溶接されるとともに、幅狭部５２にて負極タブ３２と負極導電部材４２とが溶接される。なお、一対の溶接用電極棒Ｗ１，Ｗ２の径は、溶接箇所Ｐが所望の溶接強度を確保することが可能な大きさとなるように設定されている。
Next, the welding process between the negative electrode tab 32 and the negative electrode conductive member 42 will be described.
As shown in FIG. 7, the negative electrode conductive member 42 is disposed so that the narrow portion 52 contacts the negative electrode tab 32 in a state where the negative electrode tab 32 is gathered on one end side in the stacking direction of the electrode assembly 14. And each negative electrode tab 32 and the negative electrode electrically-conductive member 42 are inserted | pinched using a pair of electrode rods W1 and W2 for welding. In this case, the welding electrode rod W <b> 1 on the negative electrode conductive member 42 side is in contact with the narrow portion 52. Further, the welding electrode rod W2 on the negative electrode tab 32 side presses each negative electrode tab 32 via the contact plate W3. In this state, electric power for welding is applied between the pair of welding electrode rods W1, W2. Accordingly, the negative electrode tabs 32 are welded to each other, and the negative electrode tab 32 and the negative electrode conductive member 42 are welded at the narrow portion 52. The diameters of the pair of welding electrode rods W1 and W2 are set so that the welding location P can have a desired welding strength.
次に、本実施形態の作用について説明する。
既に説明した通り、幅狭部５２にて負極タブ３２と負極導電部材４２とが溶接されている。これにより、幅広部５１にて溶接する構成と比較して、熱拡散の経路が狭くなっているため、溶接に係る熱が拡散しにくい。
Next, the operation of this embodiment will be described.
As already described, the negative electrode tab 32 and the negative electrode conductive member 42 are welded at the narrow portion 52. Thereby, compared with the structure welded by the wide part 51, since the path | route of thermal diffusion is narrow, the heat which concerns on it is hard to spread | diffuse.
以上詳述した本実施形態によれば以下の優れた効果を奏する。
（１）板状の負極導電部材４２に幅狭部５２を設け、負極タブ３２と負極導電部材４２との溶接箇所Ｐの少なくとも一部、詳細には溶接箇所Ｐ全体が幅狭部５２にある構成とした。これにより、幅広部５１にて溶接されている構成と比較して、溶接に係る熱の拡散の低減を図ることができるため、負極タブ３２と負極導電部材４２との溶接を好適に行うことができる。
According to the embodiment described in detail above, the following excellent effects are obtained.
(1) The plate-like negative electrode conductive member 42 is provided with a narrow portion 52, and at least a part of the welded portion P between the negative electrode tab 32 and the negative electrode conductive member 42, specifically, the entire welded portion P is in the narrow portion 52. The configuration. Thereby, compared with the structure welded by the wide part 51, since the spreading | diffusion of the heat | fever concerning welding can be reduced, welding with the negative electrode tab 32 and the negative electrode electrically-conductive member 42 can be performed suitably. it can.
特に、一般的に負極導電部材４２の厚さは負極タブ３２の厚さよりも厚いため、負極導電部材４２において熱拡散が発生し易い。これに対して、負極導電部材４２に幅狭部５２を設けることにより、特に熱拡散が発生し易い負極導電部材４２内の熱拡散を抑制することができる。 In particular, since the thickness of the negative electrode conductive member 42 is generally thicker than the thickness of the negative electrode tab 32, thermal diffusion is likely to occur in the negative electrode conductive member 42. On the other hand, by providing the narrow portion 52 in the negative electrode conductive member 42, it is possible to suppress thermal diffusion in the negative electrode conductive member 42, which is particularly susceptible to thermal diffusion.
また、上述した通り、負極タブ３２は、複数集める関係上、負極導電部材４２よりも薄くなっているとともに、負極タブ３２には、折り曲げることによって応力が付与されている。このため、負極タブ３２の幅を局所的に狭くすると、負極タブ３２が破断し易い。 In addition, as described above, a plurality of the negative electrode tabs 32 are thinner than the negative electrode conductive member 42 in terms of collection, and stress is applied to the negative electrode tabs 32 by bending. For this reason, when the width of the negative electrode tab 32 is locally narrowed, the negative electrode tab 32 is easily broken.
これに対して、本実施形態によれば、負極タブ３２よりも厚い負極導電部材４２に幅狭部５２を設けることにより、負極タブ３２の破断を抑制しつつ、熱拡散を抑制することができる。これにより、負極タブ３２と負極導電部材４２との溶接を好適に行うことができる。 On the other hand, according to the present embodiment, by providing the narrow portion 52 in the negative electrode conductive member 42 that is thicker than the negative electrode tab 32, it is possible to suppress thermal diffusion while suppressing breakage of the negative electrode tab 32. . Thereby, welding with the negative electrode tab 32 and the negative electrode electrically-conductive member 42 can be performed suitably.
（２）また、負極タブ３２を構成する銅は、正極タブ３１を構成するアルミニウムよりも抵抗が低いため、溶接に係る電力が付与された場合に、その電力がジュール熱に変換されにくい。このため、負極タブ３２と負極導電部材４２の方が、正極タブ３１と正極導電部材４１よりも、溶接不良が発生し易い。 (2) Moreover, since the copper which comprises the negative electrode tab 32 has resistance lower than the aluminum which comprises the positive electrode tab 31, when the electric power concerning welding is provided, the electric power is hard to be converted into Joule heat. For this reason, the negative electrode tab 32 and the negative electrode conductive member 42 are more likely to cause poor welding than the positive electrode tab 31 and the positive electrode conductive member 41.
これに対して、上記のように幅狭部５２を設け、その幅狭部５２にて溶接を行う構成を採用することにより、正極側よりも問題となり易い負極タブ３２と負極導電部材４２との溶接を好適に行うことができる。 In contrast, by adopting a configuration in which the narrow portion 52 is provided and welding is performed at the narrow portion 52 as described above, the negative electrode tab 32 and the negative electrode conductive member 42 are more likely to be problematic than the positive electrode side. Welding can be suitably performed.
（３）幅狭部５２は、負極導電部材４２においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端４２ｃを構成する。これにより、溶接に係る熱の拡散が一方向に限定されるため、より好適に熱拡散を抑制することができる。すなわち、例えば幅狭部５２に対して幅方向及び厚さ方向の双方と直交する方向の両側に幅広部５１が設けられている場合、幅狭部５２に対して熱が付与されると、当該熱は、両側の幅広部５１に向けて拡散される。つまり、熱拡散方向が２方向となる。これに対して、本実施形態によれば、幅狭部５２が負極導電部材４２の一端４２ｃを構成しているため、幅広部５１は片側にしか存在しない。これにより、熱拡散方向が一方向に限定されることとなり、熱拡散を、より好適に抑制することができる。 (3) The narrow portion 52 constitutes one end 42 c located in the direction perpendicular to both the width direction and the thickness direction of the negative electrode conductive member 42. Thereby, since the spreading | diffusion of the heat which concerns on welding is limited to one direction, a thermal diffusion can be suppressed more suitably. That is, for example, when the wide portion 51 is provided on both sides in the direction orthogonal to both the width direction and the thickness direction with respect to the narrow portion 52, when heat is applied to the narrow portion 52, The heat is diffused toward the wide portions 51 on both sides. That is, the heat diffusion direction is two directions. On the other hand, according to the present embodiment, since the narrow portion 52 constitutes one end 42c of the negative electrode conductive member 42, the wide portion 51 exists only on one side. Thereby, the thermal diffusion direction is limited to one direction, and thermal diffusion can be more suitably suppressed.
（４）幅狭部５２における幅方向の中央と、幅広部５１の幅方向の中央とを、負極導電部材４２の幅方向において一致させた。これにより、溶接の際に幅狭部５２がその厚さ方向から押圧された場合に、負極導電部材４２が曲がったり、位置ずれしたりすることなく、安定する。よって、負極タブ３２と負極導電部材４２との溶接を好適に行うことができる。 (4) The center in the width direction of the narrow portion 52 and the center in the width direction of the wide portion 51 are matched in the width direction of the negative electrode conductive member 42. Thereby, when the narrow part 52 is pressed from the thickness direction during welding, the negative electrode conductive member 42 is stabilized without being bent or displaced. Therefore, the negative electrode tab 32 and the negative electrode conductive member 42 can be suitably welded.
なお、上記実施形態は以下のように変更してもよい。
○ 実施形態では、溶接箇所Ｐ全体が幅狭部５２にある構成であったが、これに限られない。例えば、溶接箇所Ｐの一部が幅狭部５２にあって、別の一部が幅広部５１にある構成であってもよい。要は、溶接箇所Ｐの少なくとも一部が幅狭部５２にあればよい。
In addition, you may change the said embodiment as follows.
In the embodiment, the entire welding spot P is in the narrow portion 52, but is not limited thereto. For example, a configuration in which a part of the welding spot P is in the narrow part 52 and another part is in the wide part 51 may be used. In short, it suffices that at least a part of the welded portion P is in the narrow portion 52.
○ 実施形態では、幅狭部５２は負極導電部材４２においてその幅方向と直交する方向の一端４２ｃを構成したが、これに限られない。例えば、図８に示すように、幅狭部５２と、その幅狭部５２に対して幅方向と直交する方向の両側に設けられた幅広部５１とを有する負極導電部材１０１であってもよい。 In embodiment, although the narrow part 52 comprised the end 42c of the direction orthogonal to the width direction in the negative electrode electrically-conductive member 42, it is not restricted to this. For example, as illustrated in FIG. 8, the negative electrode conductive member 101 may include a narrow portion 52 and wide portions 51 provided on both sides of the narrow portion 52 in a direction orthogonal to the width direction. .
○ 実施形態では、幅狭部５２は、幅広部５１の幅方向の中央に配置されている構成であったが、完全に中央にある必要はなく、例えば幅広部５１の幅方向の両端部よりも中央よりに配置されていればよい。また、図９に示すように、幅広部５１の幅方向の両端部のうち一方の端部に幅狭部５２を設けてもよい。要は、幅方向に対する幅狭部５２の位置は任意である。 In the embodiment, the narrow portion 52 is arranged at the center in the width direction of the wide portion 51, but does not have to be completely at the center, for example, from both ends of the wide portion 51 in the width direction. As long as it is arranged from the center. Further, as shown in FIG. 9, a narrow portion 52 may be provided at one end portion of both end portions in the width direction of the wide portion 51. In short, the position of the narrow portion 52 in the width direction is arbitrary.
○ 図１０に示すように、負極導電部材４２において、幅方向に所定の間隔を隔てて一対の貫通孔１１１を形成してもよい。この場合、一対の貫通孔１１１の間の部位が幅狭部１１２となる。そして、その幅狭部１１２に溶接箇所Ｐを設けるとよい。 As shown in FIG. 10, in the negative electrode conductive member 42, a pair of through holes 111 may be formed at a predetermined interval in the width direction. In this case, the portion between the pair of through holes 111 becomes the narrow portion 112. And it is good to provide the welding location P in the narrow part 112. FIG.
○ 実施形態では、幅狭部５２における幅広部５１側の部位は、幅方向の端部から中央に向けて凸となるように湾曲していたが、これに限られない。例えば直線状に傾斜している構成であってもよい。また、幅狭部５２全体が、幅広部５１から一端４２ｃに向けて徐々に先細りとなっている構成であってもよい。要は、幅狭部５２は、幅広部５１よりも幅が狭ければ、その具体的な形状は任意である。 In the embodiment, the portion of the narrow portion 52 on the wide portion 51 side is curved so as to protrude from the end in the width direction toward the center, but is not limited thereto. For example, the structure inclined linearly may be sufficient. Further, the entire narrow portion 52 may gradually taper from the wide portion 51 toward the one end 42c. In short, as long as the width of the narrow portion 52 is narrower than that of the wide portion 51, the specific shape thereof is arbitrary.
○ 実施形態では、負極導電部材４２が取り付けられた状態において、積層方向と一致する方向を負極導電部材４２の幅方向としたが、これに限られず、例えば負極導電部材４２の厚さ方向から見て積層方向と直交する方向を、負極導電部材４２の幅方向としてもよい。この場合、負極導電部材４２の厚さ方向から見て積層方向と直交する方向に所定の間隔を隔てて一対の貫通孔を設けることにより、幅狭部を形成する構成としてもよい。要は、負極導電部材４２の幅とは、負極導電部材４２の厚さ方向から見て、負極導電部材４２の隣り合う２辺のうちいずれか一方の辺に沿った方向の長さである。 In the embodiment, in the state in which the negative electrode conductive member 42 is attached, the direction that coincides with the stacking direction is the width direction of the negative electrode conductive member 42, but is not limited thereto. The direction perpendicular to the stacking direction may be the width direction of the negative electrode conductive member 42. In this case, the narrow portion may be formed by providing a pair of through holes at a predetermined interval in a direction orthogonal to the stacking direction when viewed from the thickness direction of the negative electrode conductive member 42. In short, the width of the negative electrode conductive member 42 is the length in the direction along one of the two adjacent sides of the negative electrode conductive member 42 as viewed from the thickness direction of the negative electrode conductive member 42.
○ 実施形態では、正極タブ３１と正極導電部材４１との溶接態様は、負極タブ３２と負極導電部材４２との溶接態様と同様であったが、これに限られず、異なっていてもよい。例えば、幅狭部５２による溶接を、正極タブ３１と正極導電部材４１との溶接にのみ適用してもよいし、逆に、幅狭部５２による溶接を、負極タブ３２と負極導電部材４２との溶接にのみ適用してもよい。 In the embodiment, the welding mode between the positive electrode tab 31 and the positive electrode conductive member 41 is the same as the welding mode between the negative electrode tab 32 and the negative electrode conductive member 42, but is not limited thereto, and may be different. For example, welding by the narrow portion 52 may be applied only to welding of the positive electrode tab 31 and the positive electrode conductive member 41, and conversely, welding by the narrow portion 52 is performed by the negative electrode tab 32 and the negative electrode conductive member 42. It may be applied only to welding.
○ 実施形態では、幅狭部５２は１つのみ設けられていたが、これに限られず、複数設けてもよい。この場合、各幅狭部５２に溶接箇所Ｐを設けるとよい。
○ 実施形態では、電極組立体１４は、複数の正極電極２１及び複数の負極電極２２を備え、これら各電極２１，２２がセパレータ２３を介して積層されている所謂積層型であったが、これに限られない。例えば、帯状の正極電極及び帯状の負極電極を捲回して層状に積層した捲回型の電極組立体であってもよい。
In the embodiment, only one narrow portion 52 is provided. However, the present invention is not limited to this, and a plurality of narrow portions 52 may be provided. In this case, it is good to provide the welding location P in each narrow part 52. FIG.
In the embodiment, the electrode assembly 14 is a so-called laminated type in which a plurality of positive electrodes 21 and a plurality of negative electrodes 22 are provided, and these electrodes 21 and 22 are laminated via a separator 23. Not limited to. For example, a wound-type electrode assembly in which a belt-like positive electrode and a belt-like negative electrode are wound and laminated in layers may be used.
○ 実施形態では、各電極２１，２２の大きさは同一であったが、これに限られず、負極電極２２が正極電極２１よりも一回り大きい構成であってもよい。この場合、負極活物質層２２ｂは、正極活物質層２１ｂよりも一回り大きいとよい。 In the embodiment, the size of each of the electrodes 21 and 22 is the same, but is not limited thereto, and the negative electrode 22 may be slightly larger than the positive electrode 21. In this case, the negative electrode active material layer 22b may be slightly larger than the positive electrode active material layer 21b.
○ 実施形態では、正極活物質層２１ｂは、正極電極２１の両面にある構成であったが、これに限られず、正極電極２１の片面のみにある構成としてもよい。同様に、負極電極２２の片面のみに負極活物質層２２ｂがある構成としてもよい。 In the embodiment, the positive electrode active material layer 21b is configured to be on both surfaces of the positive electrode 21, but is not limited thereto, and may be configured to be only on one surface of the positive electrode 21. Similarly, the negative electrode active material layer 22b may be provided only on one side of the negative electrode 22.
○ 実施形態では、導電部材４１，４２とタブ３１，３２の同一極性同士は同一金属で構成されていたが、これに限られず、異なる金属で構成されていてもよい。
○ 実施形態では、負極タブ３２は、負極電極２２の端部２２ｃに沿う方向と直交する方向に突出している構成であったが、これに限られず、負極電極２２の端部２２ｃに沿う方向と直交する方向に対して傾斜して突出している構成であってもよい。
In the embodiment, the same polarities of the conductive members 41 and 42 and the tabs 31 and 32 are made of the same metal, but are not limited thereto, and may be made of different metals.
In the embodiment, the negative electrode tab 32 is configured to protrude in a direction orthogonal to the direction along the end 22c of the negative electrode 22, but is not limited thereto, and the direction along the end 22c of the negative electrode 22 The structure which inclines and protrudes with respect to the orthogonal direction may be sufficient.
○ 実施形態の二次電池１０が搭載される対象は任意である。例えば、自動車や産業用車両等の車両に搭載してもよいし、定置用の蓄電ユニットに搭載してもよい。
○ 本発明を、電気二重層キャパシタ等の他の蓄電装置に適用してもよい。
(Circle) the object in which the secondary battery 10 of embodiment is mounted is arbitrary. For example, it may be mounted on a vehicle such as an automobile or an industrial vehicle, or may be mounted on a stationary power storage unit.
The present invention may be applied to other power storage devices such as electric double layer capacitors.
○ 実施形態では、二次電池１０はリチウムイオン二次電池であったが、これに限られず、ニッケル水素等の他の二次電池であってもよい。要は、正極活物質層と負極活物質層との間をイオンが移動するとともに電荷の授受を行うものであればよい。 In embodiment, although the secondary battery 10 was a lithium ion secondary battery, it is not restricted to this, Other secondary batteries, such as nickel hydride, may be sufficient. In short, any ion may be used as long as ions move between the positive electrode active material layer and the negative electrode active material layer and transfer charge.
１０…二次電池（蓄電装置）、１１…ケース、１４…電極組立体、１５，１６…端子、２１，２２…電極、３１，３２…タブ、４１，４２…導電部材、４２ｃ…負極導電部材の一端、５１…幅広部、５２…幅狭部、１０１…別例の負極導電部材、１１１…貫通孔、１１２…幅狭部。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery (electric storage apparatus), 11 ... Case, 14 ... Electrode assembly, 15, 16 ... Terminal, 21, 22 ... Electrode, 31, 32 ... Tab, 41, 42 ... Conductive member, 42c ... Negative electrode conductive member , 51... Wide portion, 52... Narrow portion, 101... Negative electrode conductive member of another example, 111.
Claims (6)
前記タブと溶接されているとともに、前記電極が収容されるケースに設けられた端子と電気的に接続されている板状の導電部材と、
を備えた蓄電装置において、
前記電極は、セパレータを介した状態で複数積層されており、
前記導電部材は、幅が相違する幅広部及び幅狭部を有し、
前記導電部材と複数の前記タブとは、タブ同士のみが溶接された溶接箇所を有することなく同一の溶接箇所をもって溶接されており、
前記導電部材と前記タブとの溶接箇所の少なくとも一部は、前記幅狭部にあり、
前記幅狭部は、前記導電部材においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端を構成しており、
前記導電部材の厚さ方向から見て、前記幅広部と前記タブとは重なった状態で接触していることを特徴とする蓄電装置。 Electrodes with tabs at the ends;
A plate-like conductive member welded to the tab and electrically connected to a terminal provided in a case in which the electrode is accommodated;
In a power storage device comprising:
A plurality of the electrodes are stacked with a separator interposed therebetween,
The conductive member has a wide portion and a narrow portion having different widths,
The conductive member and the plurality of tabs are welded with the same welding location without having a welding location where only the tabs are welded,
At least a part of the welded portion between the conductive member and the tab is in the narrow portion,
The narrow portion constitutes one end located in a direction orthogonal to both the width direction and the thickness direction in the conductive member,
The power storage device, wherein the wide portion and the tab are in contact with each other when viewed from the thickness direction of the conductive member.
前記タブと溶接されているとともに、前記電極が収容されるケースに設けられた端子と電気的に接続されている板状の導電部材と、
を備えた蓄電装置の製造方法において、
前記電極を、セパレータを介して複数積層し、
複数の前記タブを前記電極の積層方向の一端側に集め、
幅が相違する幅広部及び幅狭部を有する導電部材であって、前記幅狭部は、前記導電部材においてその幅方向及び厚さ方向の双方と直交する方向に位置する一端を構成している導電部材の厚さ方向から見て、前記幅広部及び前記幅狭部と前記タブとが重なるように配置し、
前記タブ同士のみを溶接することなく、前記幅狭部と前記タブとを溶接することを特徴とする蓄電装置の製造方法。 Electrodes with tabs at the ends;
A plate-like conductive member welded to the tab and electrically connected to a terminal provided in a case in which the electrode is accommodated;
In a method for manufacturing a power storage device comprising:
A plurality of the electrodes are stacked via a separator,
Collecting the plurality of tabs on one end side in the stacking direction of the electrodes,
A conductive member having a wide portion and a narrow portion having different widths , wherein the narrow portion constitutes one end of the conductive member positioned in a direction orthogonal to both the width direction and the thickness direction. As seen from the thickness direction of the conductive member, the wide portion and the narrow portion are arranged so that the tab overlaps,
A method of manufacturing a power storage device, wherein the narrow portion and the tab are welded without welding only the tabs.
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