JP2015099648A - Power storage module - Google Patents

Power storage module Download PDF

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JP2015099648A
JP2015099648A JP2013237804A JP2013237804A JP2015099648A JP 2015099648 A JP2015099648 A JP 2015099648A JP 2013237804 A JP2013237804 A JP 2013237804A JP 2013237804 A JP2013237804 A JP 2013237804A JP 2015099648 A JP2015099648 A JP 2015099648A
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end plate
portions
plate
power storage
fastening
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JP6065327B2 (en
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櫻井　敦
Atsushi Sakurai
敦 櫻井
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Honda Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To prevent deformation of an end plate due to expansion of a power storage cell while reducing a weight of the end plate.SOLUTION: A fastening frame 15 comprises three belt-like parts 15a-15c isolated from each other in a height direction and extending in a lamination direction. An end plate 14 comprises three protrusion parts 20a, 20b, 20c isolated from each other in a height direction and extending in a width direction to connect ends of the three belt-like parts 15a-15c of a pair of fastening frames 15 corresponding to each other. Even if the end plate 14 is curved in an upward and downward direction (an arrow A-A direction) by a fastening force of the fastening frame 15, a tensile force of a center belt-like part 15b among the three belt-like parts 15a-15c is resisted to restrain curving in the upward and downward direction. Also, when the end plate 14 is curved in a width direction (an arrow B-B direction) by a fastening force of the fastening frame 15, the three protrusion parts 20a, 20b, 20c extending in the width direction of the end plate 14 function as reinforcing beads, to restrain curving in the width direction.

Description

本発明は、積層された複数の蓄電セルの積層方向両端部に一対のエンドプレートを配置し、前記一対のエンドプレートを前記複数の蓄電セルの幅方向両側面に沿って延びる一対の締結フレームで積層方向に締結する蓄電モジュールに関する。   The present invention is a pair of fastening frames in which a pair of end plates are arranged at both ends in the stacking direction of a plurality of stacked storage cells, and the pair of end plates extend along both side surfaces in the width direction of the plurality of storage cells. The present invention relates to a power storage module that is fastened in a stacking direction.

交互に積層した蓄電セルおよびホルダの積層方向両端部に配置した一対のエンドプレートを、一対のラダーフレーム（締結フレーム）の積層方向両端部にボルトで締結するものが、下記特許文献１により公知である。   Patent Document 1 below discloses that a pair of end plates arranged at both ends in the stacking direction of alternately stacked storage cells and holders are fastened to both ends in a stacking direction of a pair of ladder frames (fastening frames). is there.

特開２０１２−２５６４６６号公報JP 2012-256466 A

ところで、上記従来のものは、矩形状のエンドプレートの四隅が締結フレームに接続されるため、蓄電セルが劣化により膨張して積層方向の厚さが増加したとき、四隅を締結フレームに拘束されたエンドプレートの中央部が積層方向外側に押され、エンドプレートが上下方向および幅方向に湾曲してしまう問題がある。これを防止するには、エンドプレートを剛性が高い鋳造部材で構成すればよいが、このようにするとエンドプレートの重量、寸法およびコストが増加してしまう問題がある。   By the way, in the above-mentioned conventional one, since the four corners of the rectangular end plate are connected to the fastening frame, when the storage cell expands due to deterioration and the thickness in the stacking direction increases, the four corners are restrained by the fastening frame. There is a problem that the center portion of the end plate is pushed outward in the stacking direction and the end plate is bent in the vertical direction and the width direction. In order to prevent this, the end plate may be made of a cast member having high rigidity. However, if this is done, there is a problem that the weight, size and cost of the end plate increase.

本発明は前述の事情に鑑みてなされたもので、エンドプレートの軽量化を図りながら、蓄電セルの膨張に伴うエンドプレートの変形を防止することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to prevent the end plate from being deformed due to the expansion of the storage cell while reducing the weight of the end plate.

上記目的を達成するために、請求項１に記載された発明によれば、積層された複数の蓄電セルの積層方向両端部に一対のエンドプレートを配置し、前記一対のエンドプレートを前記複数の蓄電セルの幅方向両側面に沿って延びる一対の締結フレームで積層方向に締結する蓄電モジュールであって、前記締結フレームは高さ方向に離間して積層方向に延びる３本の帯状部を備え、前記エンドプレートは前記一対の締結フレームの相互に対応する前記３本の帯状部の端部間を接続するように、高さ方向に離間して幅方向に延びる３本の凸部あるいは凹部を備えることを特徴とする蓄電モジュールが提案される。   To achieve the above object, according to the first aspect of the present invention, a pair of end plates are disposed at both ends of the stacked storage cells in the stacking direction, and the pair of end plates are connected to the plurality of end plates. A power storage module that is fastened in a stacking direction with a pair of fastening frames extending along both sides in the width direction of the power storage cell, wherein the fastening frame includes three strips that are spaced apart in the height direction and extend in the stacking direction, The end plate includes three convex portions or concave portions extending in the width direction and spaced apart in the height direction so as to connect the end portions of the three band-shaped portions corresponding to each other of the pair of fastening frames. A power storage module characterized by this is proposed.

また請求項２に記載された発明によれば、請求項１の構成に加えて、前記３本の凸部あるいは凹部は、それらの開放部を閉塞されて閉断面部を構成することを特徴とする蓄電モジュールが提案される。   According to the invention described in claim 2, in addition to the configuration of claim 1, the three convex portions or the concave portions are configured such that their open portions are closed to form a closed cross section. A power storage module is proposed.

また請求項３に記載された発明によれば、請求項２の構成に加えて、前記エンドプレートは、前記３本の凸部あるいは凹部を有する波板状の第１プレートと、平板状の第２プレートとを積層することで前記閉断面部を構成することを特徴とする蓄電モジュールが提案される。   According to the invention described in claim 3, in addition to the configuration of claim 2, the end plate includes a corrugated first plate having the three convex portions or concave portions, and a flat plate-shaped first plate. A power storage module is proposed in which the closed cross section is formed by stacking two plates.

また請求項４に記載された発明によれば、請求項２または請求項３の構成に加えて、前記３本の凸部により前記閉断面部を構成することを特徴とする蓄電モジュールが提案される。   According to the invention described in claim 4, in addition to the configuration of claim 2 or claim 3, a power storage module is proposed in which the closed cross section is configured by the three convex portions. The

また請求項５に記載された発明によれば、請求項１〜請求項４の何れか１項の構成に加えて、前記締結フレームの帯状部と、それらに対応する前記エンドプレートの凸部あるいは凹部とは、高さ方向に重なるオーバーラップ部を有することを特徴とする蓄電モジュールが提案される。   According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, the belt-like portion of the fastening frame and the corresponding convex portion of the end plate or A power storage module is proposed in which the recess has an overlapping portion overlapping in the height direction.

また請求項６に記載された発明によれば、請求項５の構成に加えて、前記締結フレームおよび前記エンドプレートを締結するボルト、あるいは前記締結フレームおよび前記エンドプレートの溶接部が前記オーバーラップ部に配置されることを特徴とする蓄電モジュールが提案される。   According to the sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the bolt for fastening the fastening frame and the end plate or the welded portion of the fastening frame and the end plate is the overlap portion. A power storage module is proposed, which is characterized in that it is disposed in a space.

尚、実施の形態の側部締結フレーム１５は本発明の締結フレームに対応し、実施の形態の上部帯状部１５ａ、中間帯状部１５ｂおよび下部帯状部１５ｃは本発明の帯状部に対応する。   The side fastening frame 15 of the embodiment corresponds to the fastening frame of the present invention, and the upper belt-like portion 15a, the intermediate belt-like portion 15b and the lower belt-like portion 15c of the embodiment correspond to the belt-like portion of the present invention.

請求項１の構成によれば、蓄電モジュールは、積層された複数の蓄電セルの積層方向両端部に一対のエンドプレートを配置し、一対のエンドプレートを複数の蓄電セルの幅方向両側面に沿って延びる一対の締結フレームで積層方向に締結して構成される。締結フレームは高さ方向に離間して積層方向に延びる３本の帯状部を備え、エンドプレートは一対の締結フレームの相互に対応する３本の帯状部の端部間を接続するように、高さ方向に離間して幅方向に延びる３本の凸部あるいは凹部を備えるので、エンドプレートが締結フレームの締結力で上下方向に湾曲しようとしても、３本の帯状部のうちの中央の帯状部の張力が抵抗することでエンドプレートの上下方向の湾曲が抑制され、またエンドプレートが締結フレームの締結力で幅方向に湾曲しようとしても、エンドプレートは幅方向に延びる３本の凸部あるいは凹部が補強ビードとして機能することでエンドプレートの幅方向の湾曲が抑制される。エンドプレートに３本の凸部あるいは凹部を形成するだけの軽量で安価な構造でありながら、締結フレームとの協働によってエンドプレートの変形に対する剛性が高められる。   According to the configuration of claim 1, the power storage module includes a pair of end plates disposed at both ends in the stacking direction of the plurality of stacked power storage cells, and the pair of end plates are arranged along both side surfaces in the width direction of the plurality of power storage cells. Fastened in the stacking direction with a pair of fastening frames extending in the direction. The fastening frame is provided with three strips extending in the stacking direction and spaced apart in the height direction, and the end plate is connected to the ends of the three strips corresponding to each other of the pair of fastening frames. Since there are three convex portions or concave portions that are separated in the vertical direction and extend in the width direction, even if the end plate tries to bend in the vertical direction by the fastening force of the fastening frame, the central belt-like portion of the three belt-like portions. The end plate is prevented from bending in the vertical direction by resisting the tension of the end plate, and even if the end plate tries to bend in the width direction by the fastening force of the fastening frame, the end plate has three protrusions or recesses extending in the width direction. By functioning as a reinforcing bead, bending of the end plate in the width direction is suppressed. Although it is a lightweight and inexpensive structure that only forms three convex portions or concave portions on the end plate, the rigidity against deformation of the end plate is enhanced by cooperation with the fastening frame.

また請求項２の構成によれば、３本の凸部あるいは凹部は、それらの開放部を閉塞されて閉断面部を構成するので、エンドプレートの幅方向の湾曲に対する剛性が一層高められる。   Further, according to the configuration of the second aspect, the three convex portions or the concave portions are closed at their open portions to form a closed cross-sectional portion, so that the rigidity of the end plate against bending in the width direction is further enhanced.

また請求項３の構成によれば、エンドプレートは、３本の凸部あるいは凹部を有する波板状の第１プレートと、平板状の第２プレートとを積層することで閉断面部を構成するので、簡単で低コストな構造でエンドプレートの幅方向の湾曲に対する剛性を高めることができる。   According to the configuration of claim 3, the end plate forms a closed cross section by laminating a corrugated first plate having three convex portions or concave portions and a flat plate-like second plate. Therefore, the rigidity with respect to the curvature of the end plate in the width direction can be increased with a simple and low-cost structure.

また請求項４の構成によれば、３本の凸部により閉断面部を構成するので、締結フレームの帯状部の張力を剛性の高い閉断面部に伝達し、エンドプレートの幅方向の湾曲を効果的に防止することができる。   According to the fourth aspect of the present invention, the closed cross section is constituted by the three convex portions, so that the tension of the belt-like portion of the fastening frame is transmitted to the highly rigid closed cross section, and the end plate is bent in the width direction. It can be effectively prevented.

また請求項５の構成によれば、締結フレームの帯状部と、それらに対応するエンドプレートの凸部あるいは凹部とは、高さ方向に重なるオーバーラップ部を有するので、締結フレームの帯状部の張力を３本の凸部あるいは凹部に効率的に伝達し、エンドプレートの幅方向の湾曲を効果的に防止することができる。   According to the fifth aspect of the present invention, since the belt-like portion of the fastening frame and the convex portion or the concave portion of the end plate corresponding to them have an overlap portion overlapping in the height direction, the tension of the belt-like portion of the fastening frame. Can be efficiently transmitted to the three convex portions or the concave portions, and the bending of the end plate in the width direction can be effectively prevented.

また請求項６の構成によれば、締結フレームおよび前記エンドプレートを締結するボルト、あるいは締結フレームおよびエンドプレートの溶接部がオーバーラップ部に配置されるので、締結フレームの帯状部の張力を３本の凸部あるいは凹部に一層効率的に伝達することができる。   According to the configuration of the sixth aspect, since the bolt for fastening the fastening frame and the end plate or the welded portion of the fastening frame and the end plate is disposed in the overlap portion, the tension of the belt-like portion of the fastening frame is set to three. Can be more efficiently transmitted to the convex portion or concave portion.

蓄電モジュールの分解斜視図。The exploded perspective view of an electrical storage module. 側部締結フレームおよびエンドプレートの斜視図。The perspective view of a side part fastening frame and an end plate. 図２の３−３線断面図。FIG. 3 is a sectional view taken along line 3-3 in FIG. 2.

以下、図１〜図３に基づいて本発明の実施の形態を説明する。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

図１に示すように、電気自動車やハイブリッド自動車の電源として使用される蓄電モジュールＭは、積層方向に積層された所定個数（実施の形態では１２個）の蓄電セル１１…を備える。本実施の形態の蓄電セル１１…はリチウムイオンバッテリである。各蓄電セル１１は直方体状に形成され、相互に対向する一対の主面１１ａ，１１ａと、主面１１ａ，１１ａに対して直交して相互に対向する一対の側面１１ｂ，１１ｂと、主面１１ａ，１１ａおよび側面１１ｂ，１１ｂに対して直交して相互に対向する頂面１１ｃおよび底面１１ｄとを備えており、頂面１１ｃにはプラス端子１１ｅおよびマイナス端子１１ｆが設けられる。１２個の蓄電セル１１…のプラス端子１１ｅ…およびマイナス端子１１ｆ…は電気的に直列に接続される。   As shown in FIG. 1, a power storage module M used as a power source for an electric vehicle or a hybrid vehicle includes a predetermined number (12 in the embodiment) of storage cells 11 stacked in the stacking direction. The storage cells 11 in the present embodiment are lithium ion batteries. Each storage cell 11 is formed in a rectangular parallelepiped shape, a pair of main surfaces 11a, 11a facing each other, a pair of side surfaces 11b, 11b facing each other perpendicular to the main surfaces 11a, 11a, and a main surface 11a , 11a and side surfaces 11b, 11b, and a top surface 11c and a bottom surface 11d that are orthogonal to each other, and a positive terminal 11e and a negative terminal 11f are provided on the top surface 11c. The plus terminals 11e and the minus terminals 11f of the twelve storage cells 11 are electrically connected in series.

尚、本明細書において、積層方向に直交して蓄電セル１１の頂面１１ｃおよび底面１１ｄを結ぶ方向を上下方向と定義し、積層方向に直交して蓄電セル１１の一対の側面１１ｂ，１１ｂを結ぶ方向を幅方向と定義する。   In this specification, the direction connecting the top surface 11c and the bottom surface 11d of the storage cell 11 perpendicular to the stacking direction is defined as the vertical direction, and the pair of side surfaces 11b, 11b of the storage cell 11 is defined orthogonally to the stacking direction. The connecting direction is defined as the width direction.

１２個の蓄電セル１１…の主面１１ａ…と、合成樹脂で構成された１１個の四角い板状の中間蓄電セルホルダ１２…とが積層方向に交互に重ね合わされ、積層方向両端の２個の蓄電セル１１，１１の積層方向外側に合成樹脂で構成された一対の四角い板状の端部蓄電セルホルダ１３，１３が重ね合わされ、更にその積層方向外側に一対の金属製のエンドプレート１４，１４が重ね合わされる。   The main surfaces 11a of the twelve power storage cells 11 and eleven square plate-shaped intermediate power storage cell holders 12 made of synthetic resin are alternately stacked in the stacking direction, and two power storages at both ends in the stacking direction. A pair of square plate-shaped end storage cell holders 13 and 13 made of synthetic resin are superimposed on the outer side in the stacking direction of the cells 11 and 11, and a pair of metal end plates 14 and 14 are further stacked on the outer side in the stacking direction. Is done.

蓄電セル１１…、中間蓄電セルホルダ１２…、端部蓄電セルホルダ１３，１３およびエンドプレート１４，１４を積層方向に積層した状態で、一対の金属製の板状部材よりなる側部締結フレーム１５，１５の積層方向両端部を一対のエンドプレート１４，１４の幅方向両端部にボルト１７…で締結することで、１２個の蓄電セル１１…を有する蓄電モジュールＭが組み立てられる。このとき、蓄電セル１１…、中間蓄電セルホルダ１２…および端部蓄電セルホルダ１３，１３と側部締結フレーム１５，１５との間に、結露水によって蓄電セル１１…と側部締結フレーム１５，１５とが液絡するのを防止するための合成樹脂製のインシュレータ１９，１９が配置される。   The side fastening frames 15, 15 made of a pair of metal plate members in a state where the storage cells 11, intermediate storage cell holders 12, end storage cell holders 13, 13 and end plates 14, 14 are stacked in the stacking direction. Are fastened to both ends in the width direction of the pair of end plates 14, 14 with bolts 17 to assemble a power storage module M having twelve power storage cells 11. At this time, between the storage cells 11..., The intermediate storage cell holder 12... And the end storage cell holders 13 and 13 and the side fastening frames 15 and 15, the storage cells 11. Insulators 19, 19 made of synthetic resin for preventing liquid junction are disposed.

図２および図３に示すように、側部締結フレーム１５は、積層方向に相互に平行に延びる上部帯状部１５ａ、中間帯状部１５ｂおよび下部帯状部１５ｃと、これら３本の帯状部１５ａ，１５ｂ，１５ｃの積層方向両端部を上下方向に接続する一対の締結部１５ｄ，１５ｄとを備える。上部帯状部１５は中間蓄電セルホルダ１２…および端部蓄電セルホルダ１３，１３の上側の隅部を押さえるようにＬ字状断面に構成され、下部帯状部１５ｃは中間蓄電セルホルダ１２…および端部蓄電セルホルダ１３，１３の下側の隅部を押さえるように断面Ｌ字状に構成され、中間帯状部１５ｂは平坦な帯状に形成される。締結部１５ｄはエンドプレート１４の積層方向外面に重なるように断面Ｌ字状に構成され、エンドプレート１４と重なる部分がボルト１７…で締結される。また３本の帯状部１５ａ，１５ｂ，１５ｃの積層方向中間部が、上下方向に延びる連結部１５ｅで連結される。   As shown in FIGS. 2 and 3, the side fastening frame 15 includes an upper belt-like portion 15a, an intermediate belt-like portion 15b and a lower belt-like portion 15c extending in parallel to each other in the stacking direction, and these three belt-like portions 15a and 15b. , 15c are provided with a pair of fastening portions 15d, 15d that connect both ends in the stacking direction in the vertical direction. The upper belt-like portion 15 is configured in an L-shaped cross section so as to press the upper corners of the intermediate storage cell holder 12... And the end storage cell holders 13, 13, and the lower strip 15 c is formed of the intermediate storage cell holder 12. 13 and 13 are configured to have an L-shaped cross section so as to hold down the lower corners, and the intermediate belt portion 15b is formed in a flat belt shape. The fastening portion 15d is configured to have an L-shaped cross section so as to overlap the outer surface of the end plate 14 in the stacking direction, and the portion overlapping the end plate 14 is fastened with bolts 17. Further, the intermediate portions in the stacking direction of the three belt-like portions 15a, 15b, and 15c are connected by a connecting portion 15e extending in the vertical direction.

エンドプレート１４は、金属板をプレス成形した第１プレート２０と、第１プレート２０に重ね合わされて一体に溶接される平坦な金属板よりなる第２プレート２１とで構成される。波型に湾曲する第１プレート２０は、幅方向に見たときに積層方向外側に突出する３個の凸部２０ａ，２０ｂ，２０ｃと、それら３個の凸部２０ａ，２０ｂ，２０ｃ間に挟まれて積層方向外側に開放する２個の凹部２０ｄ，２０ｅとを備えており、第１プレート２０および第２プレート２１を結合することで、２個の凹部２０ｄ，２０ｅと第２プレート２１との間に、幅方向に延びる２個の閉断面部２０ｆ，２０ｇが形成される（図３参照）。   The end plate 14 includes a first plate 20 formed by press-molding a metal plate, and a second plate 21 made of a flat metal plate that is superimposed on the first plate 20 and welded integrally. The first plate 20 curved in a wave shape is sandwiched between three convex portions 20a, 20b, and 20c that project outward in the stacking direction when viewed in the width direction, and the three convex portions 20a, 20b, and 20c. The two concave portions 20d and 20e that are opened to the outside in the stacking direction are provided, and the two concave portions 20d and 20e and the second plate 21 are connected by connecting the first plate 20 and the second plate 21. Two closed cross sections 20f and 20g extending in the width direction are formed therebetween (see FIG. 3).

第２プレート２１を貫通して積層方向外側に２本のボルト２２，２２が突出しており、これらのボルト２２，２２は、複数の蓄電モジュールＭ…を共通の支持板（図示せず）に締結するために使用される。また第１プレート２０の幅方向端部には、それぞれ側部締結フレーム１５を締結するための３本のボルト１７…が螺合する３個のウエルドナット２３…が設けられる。   Two bolts 22 and 22 protrude through the second plate 21 in the stacking direction, and these bolts 22 and 22 fasten a plurality of power storage modules M to a common support plate (not shown). Used to do. Further, at the end in the width direction of the first plate 20, there are provided three weld nuts 23 to which three bolts 17 for fastening the side fastening frame 15 are screwed.

次に、上記構成を備えた本発明の実施の形態の作用を説明する。   Next, the operation of the embodiment of the present invention having the above configuration will be described.

蓄電モジュールＭを組み立てるには、１２個の蓄電セル１１…と１１個の中間蓄電セルホルダ１２…とを交互に積層し、その外側に一対の端部蓄電セルホルダ１３，１３および一対のエンドプレート１４，１４を更に重ね合わせた後に、一対のエンドプレート１４，１４に一対の側部締結フレーム１５，１５の積層方向両端部をボルト１７…で締結すれば良い。   To assemble the power storage module M, twelve power storage cells 11 and 11 intermediate power storage cell holders 12 are alternately stacked, and a pair of end power storage cell holders 13 and 13 and a pair of end plates 14, 14 is further overlapped, and then both ends in the stacking direction of the pair of side fastening frames 15 and 15 may be fastened to the pair of end plates 14 and 14 with bolts 17.

蓄電セル１１…は劣化に伴って積層方向の厚さが次第に増加する特性があり、外周部をボルト１７…で側部締結フレーム１５，１５に拘束されたエンドプレート１４は、その中央部が積層方向外側に突出するように湾曲しようとする。   The storage cells 11 have a characteristic that the thickness in the stacking direction gradually increases with deterioration, and the end plate 14 whose outer peripheral portion is constrained by the side fastening frames 15 and 15 with bolts 17 is stacked at the center. Try to bend so that it protrudes outward in the direction.

図２に示すように、上述したエンドプレート１４の湾曲方向には、その上下端部に対して中央部が積層方向外側に突出する上下方向の湾曲（矢印Ａ−Ａ参照）と、その幅方向両端部に対して中央部が積層方向外側に突出する幅方向の湾曲（矢印Ｂ−Ｂ参照）とがある。   As shown in FIG. 2, in the bending direction of the end plate 14 described above, the bending in the vertical direction (see arrow AA) in which the central portion protrudes outward in the stacking direction with respect to the upper and lower ends, and the width direction thereof. There is a curve in the width direction (see arrows BB) in which the central portion protrudes outward in the stacking direction with respect to both end portions.

しかしながら、エンドプレート１４の幅方向端部には、側部締結フレーム１５の上部帯状部１５、中間帯状部１５ｂおよび下部帯状部１５ｃが３本のボルト１７…で固定されているため、特に中間帯状部１５ｂの張力によってエンドプレート１４の上下方向中央部が積層方向外側に張り出すのを抑制し、エンドプレート１４を特別に補強することなく矢印Ａ−Ａ方向の湾曲を効果的に防止することができる。   However, since the upper belt-like portion 15, the intermediate belt-like portion 15b and the lower belt-like portion 15c of the side fastening frame 15 are fixed to the end portion in the width direction of the end plate 14 with the three bolts 17 ... It is possible to prevent the central portion in the vertical direction of the end plate 14 from protruding outward in the stacking direction due to the tension of the portion 15b, and effectively prevent the end plate 14 from bending in the direction of arrows AA without special reinforcement. it can.

一方、エンドプレート１４の上縁および下縁には側部締結フレーム１５，１５が接続されていないために積層方向の張力を充分に発生することができず、側部締結フレーム１５，１５はエンドプレート１４の矢印Ｂ−Ｂ方向の湾曲を防止する効果を有効に発揮し得ない。   On the other hand, the side fastening frames 15 and 15 are not connected to the upper edge and the lower edge of the end plate 14, so that sufficient tension in the stacking direction cannot be generated. The effect of preventing the bending of the plate 14 in the direction of the arrow BB cannot be effectively exhibited.

しかしながら、エンドプレート１４は波板状の第１プレート２０に形成した幅方向に延びる３本の凸部２０ａ，２０ｂ，２０ｃおよび２本の凹部２０ｄ，２０ｅが補強ビードとして機能することで湾曲に対する強い抵抗力を発揮し、エンドプレート１４の矢印Ｂ−Ｂ方向の湾曲を効果的に防止することができる。このとき、第１プレート２０の２本の凹部２０ｄ，２０ｅと第２プレート２１との間に形成された２個の閉断面部２０ｆ，２０ｇによってエンドプレート１４の曲げ剛性が一層高められるので、エンドプレート１４の矢印Ｂ−Ｂ方向の湾曲を一層効果的に防止することができる。   However, the end plate 14 is strong against bending because the three convex portions 20a, 20b, 20c and the two concave portions 20d, 20e extending in the width direction formed on the corrugated first plate 20 function as reinforcing beads. A resistance force can be exhibited and the end plate 14 can be effectively prevented from bending in the direction of arrow BB. At this time, the bending rigidity of the end plate 14 is further enhanced by the two closed cross-sectional portions 20f and 20g formed between the two concave portions 20d and 20e of the first plate 20 and the second plate 21, so that the end plate The bending of the plate 14 in the direction of arrow BB can be more effectively prevented.

また図３において、締結フレーム１５の３本の帯状部１５ａ，１５ｂ，１５ｃの積層方向端部と、エンドプレート１４の３本の凸部２０ａ，２０ｂ，２０ｃの幅方向端部とを接続するとき、帯状部１５ａ，１５ｂ，１５ｃの端部の上下方向幅ｐ，ｑ，ｒと、凸部２０ａ，２０ｂ，２０ｃの上下方向幅Ｐ，Ｑ，Ｒとがオーバーラップ部Ｏ…でオーバーラップし、そのオーバーラップ部Ｏ…にボルト１７…が配置されるので、帯状部１５ａ，１５ｂ，１５ｃの張力を凸部２０ａ，２０ｂ，２０ｃに効率的に伝達してエンドプレート１４の矢印Ａ−Ａ方向の湾曲を効率的に防止することができる。   In FIG. 3, when the end portions in the stacking direction of the three strip portions 15a, 15b, 15c of the fastening frame 15 and the end portions in the width direction of the three convex portions 20a, 20b, 20c of the end plate 14 are connected. , The vertical widths p, q, r of the end portions of the strips 15a, 15b, 15c and the vertical widths P, Q, R of the convex portions 20a, 20b, 20c are overlapped by an overlap portion O, Since the bolts 17 are disposed on the overlap portions O, the tension of the belt-like portions 15a, 15b, 15c is efficiently transmitted to the convex portions 20a, 20b, 20c in the direction of the arrow AA of the end plate 14. Curvature can be prevented efficiently.

以上のように、本実施の形態によれば、エンドプレート１４を高価なアルミニウム鋳造部材で構成することなく、安価な板金製の第１プレート２０および第２プレート２１で構成しても、上部帯状部１５、中間帯状部１５ｂおよび下部帯状部１５ｃを有する側部締結フレーム１５との協働によって、エンドプレート１４の矢印Ａ−Ａ方向および矢印Ｂ−Ｂ方向の湾曲（図２参照）を効果的に防止することができ、エンドプレート１４の小型軽量化およびコストダウンに寄与することができる。   As described above, according to the present embodiment, even if the end plate 14 is constituted by the first plate 20 and the second plate 21 made of inexpensive sheet metal without being constituted by an expensive aluminum casting member, the upper band shape is formed. By the cooperation with the side fastening frame 15 having the portion 15, the intermediate belt portion 15b and the lower belt portion 15c, the bending of the end plate 14 in the directions of arrows AA and BB (see FIG. 2) is effectively performed. Therefore, the end plate 14 can be reduced in size and weight and cost can be reduced.

以上、本発明の実施の形態を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

例えば、実施の形態では側部締結フレーム１５およびエンドプレート１４をボルト１７で固定しているが、それらを溶接により固定しても良い。   For example, although the side fastening frame 15 and the end plate 14 are fixed with the bolts 17 in the embodiment, they may be fixed by welding.

また実施の形態ではエンドプレート１４の凸部２０ａ，２０ｂ，２０ｃ（積層方向外側に突出している部分）を側部締結フレーム１５の帯状部１５ａ，１５ｂ，１５ｃに接続しているが、エンドプレート１４の凹部（積層方向内側に突出している部分）を側部締結フレーム１５の帯状部１５ａ，１５ｂ，１５ｃに接続しても良い。   In the embodiment, the protrusions 20a, 20b, and 20c of the end plate 14 (portions protruding outward in the stacking direction) are connected to the band-like portions 15a, 15b, and 15c of the side fastening frame 15, but the end plate 14 May be connected to the band-like portions 15a, 15b, and 15c of the side fastening frame 15.

また実施の形態では、第１プレート２０の凹部２０ｄ，２０ｅと第２プレート２１との間に閉断面部２０ｆ，２０ｇを形成しているが、請求項４に記載された発明の如く、第１プレート２０の凸部２０ａ，２０ｂ，２０ｃと第２プレート２１との間に閉断面部を形成しても良い。このように構成すれば、エンドプレート１４を側部締結フレーム１５にボルト１７…で締結する部分が閉断面部を構成するので、締結フレーム１５の帯状部１５ａ，１５ｂ，１５ｃの張力を剛性の高い閉断面部に伝達し、エンドプレート１４の幅方向の湾曲を一層効果的に防止することができる。   In the embodiment, the closed cross-sections 20f and 20g are formed between the recesses 20d and 20e of the first plate 20 and the second plate 21, but as in the invention described in claim 4, the first A closed cross section may be formed between the convex portions 20 a, 20 b, 20 c of the plate 20 and the second plate 21. If comprised in this way, since the part which fastens the end plate 14 to the side part fastening frame 15 with the volt | bolt 17 ... comprises a closed cross-section part, the tension | tensile_strength of the strip | belt-shaped parts 15a, 15b, 15c of the fastening frame 15 has high rigidity. It transmits to a closed cross-section part and the curvature of the width direction of the end plate 14 can be prevented more effectively.

１１ 蓄電セル
１４ エンドプレート
１５ 側部締結フレーム（締結フレーム）
１５ａ 上部帯状部（帯状部）
１５ｂ 中間帯状部（帯状部）
１５ｃ 下部帯状部（帯状部）
１７ ボルト
２０ 第１プレート
２０ａ 凸部
２０ｂ 凸部
２０ｃ 凸部
２０ｆ 閉断面部
２０ｇ 閉断面部
２１ 第２プレート
Ｏ オーバーラップ部 11 storage cell 14 end plate 15 side fastening frame (fastening frame)
15a Upper strip (band)
15b Middle strip (band)
15c Lower strip (band)
17 Bolt 20 1st plate 20a Convex part 20b Convex part 20c Convex part 20f Closed cross-section part 20g Closed cross-section part 21 2nd plate O Overlap part

Claims (6)

積層された複数の蓄電セル（１１）の積層方向両端部に一対のエンドプレート（１４）を配置し、前記一対のエンドプレート（１４）を前記複数の蓄電セル（１１）の幅方向両側面に沿って延びる一対の締結フレーム（１５）で積層方向に締結する蓄電モジュールであって、
前記締結フレーム（１５）は高さ方向に離間して積層方向に延びる３本の帯状部（１５ａ，１５ｂ，１５ｃ）を備え、前記エンドプレート（１４）は前記一対の締結フレーム（１５）の相互に対応する前記３本の帯状部（１５ａ，１５ｂ，１５ｃ）の端部間を接続するように、高さ方向に離間して幅方向に延びる３本の凸部（２０ａ，２０ｂ，２０ｃ）あるいは凹部を備えることを特徴とする蓄電モジュール。 A pair of end plates (14) are disposed at both ends in the stacking direction of the plurality of stacked storage cells (11), and the pair of end plates (14) are disposed on both side surfaces in the width direction of the plurality of storage cells (11). A power storage module that is fastened in the stacking direction by a pair of fastening frames (15) extending along the direction,
The fastening frame (15) includes three belt-like portions (15a, 15b, 15c) that are spaced apart in the height direction and extend in the stacking direction, and the end plate (14) is formed between the pair of fastening frames (15). Three projecting portions (20a, 20b, 20c) extending in the width direction and spaced apart in the height direction so as to connect the end portions of the three strip portions (15a, 15b, 15c) corresponding to A power storage module comprising a recess. 前記３本の凸部（２０ａ，２０ｂ，２０ｃ）あるいは凹部は、それらの開放部を閉塞されて閉断面部（２０ｆ，２０ｇ）を構成することを特徴とする、請求項１に記載の蓄電モジュール。   2. The power storage module according to claim 1, wherein the three convex portions (20 a, 20 b, 20 c) or the concave portions constitute closed cross-section portions (20 f, 20 g) by closing their open portions. . 前記エンドプレート（１４）は、前記３本の凸部（２０ａ，２０ｂ，２０ｃ）あるいは凹部を有する波板状の第１プレート（２０）と、平板状の第２プレート（２１）とを積層することで前記閉断面部（２０ｆ，２０ｇ）を構成することを特徴とする、請求項２に記載の蓄電モジュール。   The end plate (14) is formed by laminating a corrugated first plate (20) having the three convex portions (20a, 20b, 20c) or concave portions and a flat plate-like second plate (21). The power storage module according to claim 2, wherein the closed cross section (20 f, 20 g) is configured. 前記３本の凸部（２０ａ，２０ｂ，２０ｃ）により前記閉断面部を構成することを特徴とする、請求項２または請求項３に記載の蓄電モジュール。   The power storage module according to claim 2 or 3, wherein the closed section is constituted by the three convex portions (20a, 20b, 20c). 前記締結フレーム（１５）の帯状部（１５ａ，１５ｂ，１５ｃ）と、それらに対応する前記エンドプレート（１４）の凸部（２０ａ，２０ｂ，２０ｃ）あるいは凹部とは、高さ方向に重なるオーバーラップ部（Ｏ）を有することを特徴とする、請求項１〜請求項４の何れか１項に記載の蓄電モジュール。   The belt-like portions (15a, 15b, 15c) of the fastening frame (15) and the corresponding convex portions (20a, 20b, 20c) or concave portions of the end plate (14) overlap in the height direction. It has a part (O), The electrical storage module of any one of Claims 1-4 characterized by the above-mentioned. 前記締結フレーム（１５）および前記エンドプレート（１４）を締結するボルト（１７）、あるいは前記締結フレーム（１５）および前記エンドプレート（１４）の溶接部が前記オーバーラップ部（Ｏ）に配置されることを特徴とする、請求項５に記載の蓄電モジュール。   A bolt (17) for fastening the fastening frame (15) and the end plate (14), or a welded portion of the fastening frame (15) and the end plate (14) is disposed in the overlap portion (O). The power storage module according to claim 5, wherein:
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