JP6658130B2 - Method of manufacturing battery module - Google Patents

Method of manufacturing battery module Download PDF

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JP6658130B2
JP6658130B2 JP2016048291A JP2016048291A JP6658130B2 JP 6658130 B2 JP6658130 B2 JP 6658130B2 JP 2016048291 A JP2016048291 A JP 2016048291A JP 2016048291 A JP2016048291 A JP 2016048291A JP 6658130 B2 JP6658130 B2 JP 6658130B2
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bus bar
negative electrode
plate
battery
battery module
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JP2017162764A (en
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優 高木
優 高木
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Toyota Motor Corp
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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

Description

本発明は、円筒電池を用いた電池モジュールの製造方法に関する。   The present invention relates to a method for manufacturing a battery module using a cylindrical battery.

有底筒状の電池ケース内に正極板と負極板とをセパレータを介して巻回した電極巻回体及び電解液を収容し、電池ケースの開口端を封口部材によって封口した円筒電池が用いられている。このような円筒電池では、電極巻回体の負極から引き出された負極リードが電池ケースの底板内面にスポット溶接され、正極板から引き出された正極リードが封口部材の封口蓋に接続されているので、電池ケースが電池の負極出力端子となり、封口蓋が電池の正極出力端子となる（例えば、特許文献１参照）。   A cylindrical battery is used in which an electrode winding body and an electrolyte solution in which a positive electrode plate and a negative electrode plate are wound via a separator are housed in a bottomed cylindrical battery case, and an opening end of the battery case is sealed with a sealing member. ing. In such a cylindrical battery, the negative electrode lead pulled out from the negative electrode of the electrode winding body is spot-welded to the inner surface of the bottom plate of the battery case, and the positive electrode lead pulled out from the positive electrode plate is connected to the sealing lid of the sealing member. The battery case serves as a negative output terminal of the battery, and the sealing lid serves as a positive output terminal of the battery (for example, see Patent Document 1).

また、特許文献１のような円筒電池を複数接続した電池モジュールが用いられている。電池モジュールは、複数の円筒電池と、これらの円筒電池を多段多列に配列して保持する電池ホルダと、各円筒電池の端部電極を接続するリード板とを備えている。このような電池モジュールは、電池ホルダの所定位置に円筒電池を固定した後、リード板を各円筒電池の正極端子である封口蓋、負極端子である電池ケースに抵抗溶接して製造される（例えば、特許文献２参照）。   Also, a battery module in which a plurality of cylindrical batteries are connected as in Patent Document 1 is used. The battery module includes a plurality of cylindrical batteries, a battery holder that holds the cylindrical batteries in a multi-stage and multi-row configuration, and a lead plate that connects end electrodes of each cylindrical battery. Such a battery module is manufactured by fixing a cylindrical battery to a predetermined position of a battery holder, and then resistance-welding a lead plate to a sealing lid serving as a positive terminal of each cylindrical battery and a battery case serving as a negative terminal (for example, And Patent Document 2).

特開２０００―９０９７４号公報JP 2000-90974 A 特開２０１２―２４３５３５号公報JP 2012-243535 A

ところで、特許文献１に記載されたような円筒電池を用いて特許文献２に記載された電池モジュールを製造する場合、電池ケースの底板内面にスポット溶接された負極リードと底板外面のリード板とが重なる位置となってしまう場合がある。この場合、底板外面とリード板を抵抗溶接する際の電流が分流して底板と負極リードとの間に流れてしまい、発熱によって電池ケースの底板が損傷してしまうという場合があった。   By the way, when manufacturing the battery module described in Patent Literature 2 using a cylindrical battery as described in Patent Literature 1, the negative electrode lead spot-welded to the inner surface of the bottom plate of the battery case and the lead plate on the outer surface of the bottom plate are formed. In some cases, the positions may overlap. In this case, the current at the time of resistance welding between the outer surface of the bottom plate and the lead plate is divided and flows between the bottom plate and the negative electrode lead, and the bottom plate of the battery case may be damaged by heat generation.

そこで、本発明は、電池モジュール製造中における電池ケースの損傷を抑制することを目的とする。   Therefore, an object of the present invention is to suppress damage to a battery case during manufacturing of a battery module.

本発明の電池モジュールの製造方法は、正極板と負極板とをセパレータを介して円筒状に巻回した電極巻回体と前記電極巻回体を収容する有底円筒型の電池ケースとを含む円筒電池と、前記円筒電池の外径が固定される丸孔を有する散熱板と、前記散熱板に取り付けられるバスバーアセンブリと、を備え、前記電極巻回体が前記負極板から引き出され、前記電池ケースの底板内面に溶接される負極リードを含み、前記円筒電池は、外面に前記負極リードの位置を示すマークを有し、前記バスバーアセンブリが前記丸孔の配置に合わせて設けられた開口と前記開口の周縁から前記開口の内側に向かって延出するバスバーとを含む、電池モジュールの製造方法であって、前記マークに基づいて、前記負極リードと前記バスバーとの間が所定距離だけ離れるように前記円筒電池と前記バスバーアセンブリとを前記散熱板に取り付け、前記バスバーと前記電池ケースの底板外面とを溶接することを特徴とする。   The method for manufacturing a battery module of the present invention includes an electrode winding body obtained by winding a positive electrode plate and a negative electrode plate in a cylindrical shape via a separator, and a bottomed cylindrical battery case that houses the electrode winding body. A cylindrical battery, a heat-dissipating plate having a round hole to which the outer diameter of the cylindrical battery is fixed, and a bus bar assembly attached to the heat-dissipating plate, wherein the electrode winding body is pulled out from the negative electrode plate, The cylindrical battery includes a negative electrode lead welded to an inner surface of a bottom plate of the case, the cylindrical battery has a mark indicating a position of the negative electrode lead on an outer surface, and the bus bar assembly is provided with an opening provided in accordance with an arrangement of the round hole. A bus bar extending from the periphery of the opening toward the inside of the opening, the battery module being provided with a bus bar, wherein the distance between the negative electrode lead and the bus bar is a predetermined distance based on the mark. Away so attached to said cylindrical battery and the bus bar assembly to the diffuser hot plate, characterized by welding the bottom plate outer surface of the bus bar and the battery case.

本発明は、電池モジュール製造中における電池ケースの損傷を抑制することができる。   ADVANTAGE OF THE INVENTION This invention can suppress the damage of a battery case during manufacture of a battery module.

本発明の実施形態の製造方法により製造した電池モジュールの概略斜視図である。It is a schematic perspective view of the battery module manufactured by the manufacturing method of the embodiment of the present invention. 本発明の実施形態の製造方法により製造した電池モジュールの分解斜視図である。It is an exploded perspective view of the battery module manufactured by the manufacturing method of the embodiment of the present invention. 図１に示す電池モジュールのＡ−Ａ断面である。FIG. 2 is a cross-sectional view taken along line AA of the battery module shown in FIG. 1. 図２に示す電池モジュールの負極バスバー板を示す上側から見た平面図である。FIG. 3 is a plan view showing a negative electrode bus bar plate of the battery module shown in FIG. 2 as viewed from above. 図２に示す電池モジュールの負極バスバーアセンブリを示す上側から見た斜視図である。FIG. 3 is a perspective view illustrating a negative electrode bus bar assembly of the battery module illustrated in FIG. 2 as viewed from above. 図２に示す電池モジュールの円筒電池の製造工程を示す説明図である。FIG. 3 is an explanatory view showing a manufacturing process of the cylindrical battery of the battery module shown in FIG. 2. 図６に示す電極巻回体を構成する正極板と負極板とセパレータとを示す説明図である。FIG. 7 is an explanatory diagram illustrating a positive electrode plate, a negative electrode plate, and a separator that constitute the electrode winding body illustrated in FIG. 6. 図２に示す電池モジュールの散熱板に円筒電池を組み込む工程を示す電池モジュール下側から見た斜視図である。FIG. 3 is a perspective view showing a step of incorporating a cylindrical battery into a heat dissipation plate of the battery module shown in FIG. 2 as viewed from below the battery module. 図２に示す電池モジュールの散熱板に円筒電池とバスバーアセンブリを取り付けた状態を示す電池モジュール下側から見た斜視図である。FIG. 3 is a perspective view showing a state in which a cylindrical battery and a bus bar assembly are attached to a heat dissipation plate of the battery module shown in FIG. 2 as viewed from below the battery module.

以下、図面を参照しながら本発明の本実施形態の電池モジュール２０の製造方法について説明するが、その前に、本実施形態の製造方法によって製造される電池モジュール２０の構造について簡単に説明する。なお、各図中の、上、下、前、後、右、左の文字は電池モジュール２０の上下前後左右の方向を示す。   Hereinafter, the method of manufacturing the battery module 20 of the present embodiment of the present invention will be described with reference to the drawings. Before that, the structure of the battery module 20 manufactured by the manufacturing method of the present embodiment will be briefly described. In addition, in each figure, the characters of upper, lower, front, rear, right, and left indicate the directions of up, down, front, back, left, and right of the battery module 20.

図１に示すように、電池モジュール２０は略直方体形状で、複数の円筒電池１０が固定される金属製の散熱板２２と、散熱板２２の上に取り付けられて円筒電池１０の周囲を囲む樹脂製のカバー２３と、散熱板２２の下側に取り付けられる底蓋２５と、カバー２３の上部を覆う天井蓋２４とを含んでいる。   As shown in FIG. 1, the battery module 20 has a substantially rectangular parallelepiped shape, and a metal heat dissipation plate 22 to which the plurality of cylindrical batteries 10 are fixed, and a resin mounted on the heat dissipation plate 22 and surrounding the cylindrical battery 10. And a bottom cover 25 attached to the lower side of the heat dissipating plate 22, and a ceiling cover 24 covering an upper portion of the cover 23.

図２に示すように、散熱板２２は、円筒電池１０が差し込み固定される多数の丸孔２２ａが設けられた、例えば、アルミニウム等の金属板である。散熱板２２の厚さは、丸孔２２ａの円筒面によって円筒電池１０を保持することができる程度の厚さ、例えば、１０〜２０ｍｍ程度、である。図２、３に示すように、円筒電池１０は、散熱板２２に対して立て方向で、各円筒電池１０が平行に並ぶように接着剤３８によってその外径が固定されている。   As shown in FIG. 2, the heat dissipating plate 22 is a metal plate, such as aluminum, provided with a large number of round holes 22 a into which the cylindrical battery 10 is inserted and fixed. The thickness of the heat dissipation plate 22 is such that the cylindrical surface of the round hole 22a can hold the cylindrical battery 10, for example, about 10 to 20 mm. As shown in FIGS. 2 and 3, the outer diameter of the cylindrical battery 10 is fixed by an adhesive 38 so that the cylindrical batteries 10 are arranged in parallel in a vertical direction with respect to the heat dissipation plate 22.

樹脂製のカバー２３は、各円筒電池１０の正極端子１１が突出する穴２３ｃが設けられた天井板２３ａと散熱板２２に組み付けられた複数の円筒電池１０の外周を覆う四角筒２３ｂとから構成されている。図３に示すように、カバー２３を散熱板２２の上に取り付けると、カバー２３の天井板２３ａの穴２３ｃからは各円筒電池１０の正極端子１１が突出する。カバー２３の穴２３ｃの上側にはいくつかのグループごとに円筒電池１０の正極端子１１を接続する複数の正極バスバー板２６が取り付けられ、その上に天井蓋２４が取り付けられる。   The resin cover 23 includes a ceiling plate 23 a provided with a hole 23 c from which the positive electrode terminal 11 of each cylindrical battery 10 protrudes, and a square tube 23 b covering the outer periphery of the plurality of cylindrical batteries 10 assembled to the heat dissipation plate 22. Have been. As shown in FIG. 3, when the cover 23 is mounted on the heat dissipation plate 22, the positive terminal 11 of each cylindrical battery 10 protrudes from the hole 23 c of the ceiling plate 23 a of the cover 23. Above the hole 23c of the cover 23, a plurality of positive busbar plates 26 for connecting the positive terminals 11 of the cylindrical batteries 10 are mounted for each group, and a ceiling lid 24 is mounted thereon.

散熱板２２の下側には円筒電池１０の負極端子１２をいくつかのグループ毎に接続する負極バスバーアセンブリ３０が取り付けられる。負極バスバーアセンブリ３０は、図４に示す３枚の負極バスバー板３４Ａ，３４Ｂ，３４Ｃを、図５に示すように樹脂３３でモールドした板状の部材である。図４に示すように、各負極バスバー板３４Ａ〜３４Ｃは、散熱板２２の丸孔２２ａの配置に合わせて設けられた円形の開口３１と、開口３１の周縁から開口の内側に向かって延出する切片状のバスバー３２を備えている。バスバー３２は円筒電池１０の負極端子１２に溶接により接続される。図４，５に示すように、本実施形態では、バスバー３２は、電池モジュール２０の左側から右側に向かって延出している。また、バスバー３２は、円形の開口３１の中心よりも電池モジュール２０の前側に寄った位置に取り付けられている。このため、バスバー３２と開口３１との前後方向の距離は、電池モジュール２０の後側が前側よりも大きくなっている。   A negative bus bar assembly 30 for connecting the negative terminals 12 of the cylindrical battery 10 in several groups is mounted below the heat dissipation plate 22. The negative electrode bus bar assembly 30 is a plate-like member formed by molding three negative electrode bus bar plates 34A, 34B, and 34C shown in FIG. 4 with a resin 33 as shown in FIG. As shown in FIG. 4, each of the negative electrode bus bar plates 34A to 34C has a circular opening 31 provided in accordance with the arrangement of the round holes 22a of the heat dissipation plate 22, and extends from the periphery of the opening 31 toward the inside of the opening. A bus bar 32 in the form of a section is provided. The bus bar 32 is connected to the negative electrode terminal 12 of the cylindrical battery 10 by welding. As shown in FIGS. 4 and 5, in the present embodiment, the bus bar 32 extends from the left side to the right side of the battery module 20. The bus bar 32 is attached to a position closer to the front side of the battery module 20 than the center of the circular opening 31. Therefore, the distance between the bus bar 32 and the opening 31 in the front-rear direction is larger at the rear side of the battery module 20 than at the front side.

図２に示すように、負極バスバーアセンブリ３０の下側には、中央がトレイ状に凹み、底面に補強用の凹凸部が形成された底蓋２５が取り付けられている。底蓋２５は、伝熱性の高いアルミ等の金属製である。   As shown in FIG. 2, a bottom lid 25 having a recessed central portion in a tray shape and a concave and convex portion for reinforcement formed on the bottom surface is attached to the lower side of the negative electrode bus bar assembly 30. The bottom cover 25 is made of metal such as aluminum having high heat conductivity.

正極バスバー板２６、負極バスバー板３４は、それぞれ一つのグループの円筒電池１０の正極端子１１同士、負極端子１２同士を接続するもので、各バスバー板２６，３４で接続されるグループの円筒電池１０は並列に接続される。そして、正極バスバー板２６と負極バスバー板３４とを接続バスバー（図示せず）で接続することにより、複数の円筒電池１０が並列接続されたグループを直列に接続した電池モジュール２０が構成される。   The positive bus bar plate 26 and the negative bus bar plate 34 connect the positive terminals 11 and the negative terminals 12 of the cylindrical battery 10 of one group, respectively, and the cylindrical batteries 10 of the group connected by the bus bar plates 26 and 34, respectively. Are connected in parallel. Then, by connecting the positive bus bar plate 26 and the negative bus bar plate 34 with a connection bus bar (not shown), a battery module 20 in which groups in which a plurality of cylindrical batteries 10 are connected in parallel are connected in series is configured.

次に、図６を参照しながら、図１から図５を参照して説明した電池モジュール２０に組み込まれる円筒電池１０の製造工程について説明する。   Next, the manufacturing process of the cylindrical battery 10 incorporated in the battery module 20 described with reference to FIGS. 1 to 5 will be described with reference to FIG.

図６（ａ）に示す電極巻回体１５は、図７（ａ）、（ｂ）に示す正極板１２２と負極板１２１とをセパレータ１２３，１２４を介して円筒状に巻回したものである。円筒状の電極巻回体１５は負極板１２１から引き出された負極リード１６と、正極板１２２から引き出された正極リード１７とを有している。負極リード１６は、電極巻回体１５の外周側の負極板から引き出されており、正極リード１７は、電極巻回体１５の中心の孔１８の近傍の正極板から引き出されている。また、電極巻回体１５は、中心に孔１８を形成するように巻回されている。   The electrode winding body 15 shown in FIG. 6A is obtained by winding the positive electrode plate 122 and the negative electrode plate 121 shown in FIGS. 7A and 7B into a cylindrical shape with separators 123 and 124 interposed therebetween. . The cylindrical electrode winding body 15 has a negative electrode lead 16 drawn from a negative electrode plate 121 and a positive electrode lead 17 drawn from a positive electrode plate 122. The negative electrode lead 16 is drawn out from the negative electrode plate on the outer peripheral side of the electrode winding body 15, and the positive electrode lead 17 is drawn out from the positive electrode plate near the center hole 18 of the electrode winding body 15. The electrode winding body 15 is wound so as to form a hole 18 at the center.

図７（ａ）に示すように、負極板１２１は、集電箔１２１ａと、集電箔１２１ａの表面に形成された負極活物質層１２１ｂとを有する。負極活物質層１２１ｂは、図７（ａ）中では、集電箔１２１ａの下側の表面に形成されるので、破線のハッチングで示す。なお、図７（ａ）、（ｂ）において、Ｙは負極板１２１と正極板１２２とセパレータ１２３，１２４との積層方向を示し、ＸはＹと直角方向を示す。   As shown in FIG. 7A, the negative electrode plate 121 has a current collecting foil 121a and a negative electrode active material layer 121b formed on the surface of the current collecting foil 121a. Since the negative electrode active material layer 121b is formed on the lower surface of the current collector foil 121a in FIG. 7A, it is indicated by broken-line hatching. 7A and 7B, Y indicates the laminating direction of the negative electrode plate 121, the positive electrode plate 122, and the separators 123 and 124, and X indicates the direction perpendicular to Y.

また、同様に、正極板１２２は、集電箔１２２ａと、集電箔１２２ａの表面に形成された正極活物質層１２２ｂとを有する。正極活物質層１２２ｂは、図７（ａ）中では、集電箔１２２ａの上側の表面に形成されるので、実線のハッチングで示す。   Similarly, the positive electrode plate 122 has a current collecting foil 122a and a positive electrode active material layer 122b formed on the surface of the current collecting foil 122a. Since the positive electrode active material layer 122b is formed on the upper surface of the current collector foil 122a in FIG. 7A, it is indicated by solid-line hatching.

電極巻回体１５は、図７（ｂ）に示すように、負極板１２１の負極活物質層１２１ｂと正極板１２２の正極活物質層１２２ｂとの間にセパレータ１２３を挟んで積層し、図７（ｂ）に示すＤの方向に長く延びる帯状の薄板とし、この帯状の薄板をセパレータ１２４と共に図７（ａ）、図７（ｂ）に示す方向Ｄが周方向となるように円筒状に巻回したものである。   As shown in FIG. 7B, the electrode winding body 15 is laminated with a separator 123 interposed between a negative electrode active material layer 121b of a negative electrode plate 121 and a positive electrode active material layer 122b of a positive electrode plate 122. A strip-shaped thin plate extending in the direction D shown in FIG. 7B is formed, and this strip-shaped thin plate is wound together with the separator 124 into a cylindrical shape so that the direction D shown in FIGS. 7A and 7B becomes the circumferential direction. It is turned.

次に、図６（ｂ）に示すような底板１３ａを有する有底円筒状の電池ケース１３を準備する。本実施形態では、電池ケース１３はステンレス鋼板を成形したものである。電池ケース１３の側面には、マーク１４が設けられている。マーク１４は印刷あるいは塗装等によって設けることができる。   Next, a bottomed cylindrical battery case 13 having a bottom plate 13a as shown in FIG. 6B is prepared. In the present embodiment, the battery case 13 is formed by forming a stainless steel plate. A mark 14 is provided on a side surface of the battery case 13. The mark 14 can be provided by printing or painting.

次に、図６（ｃ）に示すように、電極巻回体１５の負極リード１６の周方向位置と電池ケース１３のマーク１４の周方向位置を合わせて、電極巻回体１５を電池ケース１３の中に挿入する。本実施形態では、図６（ｃ）に示すように、電池ケース１３のマーク１４を左側にセットし、電極巻回体１５の負極リード１６の位置がマーク１４と同様、左側となるように位置合わせして電極巻回体１５の中に挿入する。この際、電極巻回体１５の外周側から引き出されている負極リード１６は、電池ケース１３の底板１３ａに溶接できるよう、図６（ｃ）に破線で示すように、外周側から中心に向かって折り曲げられる。また正極リード１７の先端は、後で説明する封口蓋１９と接続できるように、Ｌ字形に折り曲げられる。   Next, as shown in FIG. 6C, the circumferential position of the negative electrode lead 16 of the electrode winding body 15 and the circumferential position of the mark 14 of the battery case 13 are aligned, and the electrode winding body 15 is Insert inside. In the present embodiment, as shown in FIG. 6C, the mark 14 of the battery case 13 is set on the left side, and the position of the negative electrode lead 16 of the electrode winding body 15 is on the left side similarly to the mark 14. Together, they are inserted into the electrode winding body 15. At this time, the negative electrode lead 16 pulled out from the outer peripheral side of the electrode winding body 15 moves from the outer peripheral side toward the center as shown by a broken line in FIG. 6C so that it can be welded to the bottom plate 13a of the battery case 13. Folded. The tip of the positive electrode lead 17 is bent into an L shape so that it can be connected to a sealing lid 19 described later.

図６（ｄ）に示すように、電池ケース１３の底板１３ａに負極リード１６が接するまで電極巻回体１５を挿入したら、電極巻回体１５の中心の孔１８に電極棒４１を差し込んで、電池ケース１３の底板１３ａと負極リード１６との間に電流を流し、底板１３ａの内面と負極リード１６とを溶接で接続する。図６（ｅ）に示すように、溶接が終ると、電池ケース１３のマーク１４の周方向位置は、負極リード１６の周方向位置と一致している。従って、マーク１４は、負極リード１６の周方向位置を示すものとなる。   As shown in FIG. 6 (d), when the electrode winding body 15 is inserted until the negative electrode lead 16 contacts the bottom plate 13 a of the battery case 13, the electrode rod 41 is inserted into the hole 18 at the center of the electrode winding body 15. A current flows between the bottom plate 13a of the battery case 13 and the negative electrode lead 16, and the inner surface of the bottom plate 13a and the negative electrode lead 16 are connected by welding. As shown in FIG. 6E, when welding is completed, the circumferential position of the mark 14 on the battery case 13 matches the circumferential position of the negative electrode lead 16. Therefore, the mark 14 indicates the circumferential position of the negative electrode lead 16.

図６（ｆ）に示すように、負極リード１６の溶接が終了したら、電池ケース１３の内部に電解液を注入し、封口蓋１９と正極リード１７とが接続するように、電池ケース１３の上部に封口蓋１９を取り付ける。   As shown in FIG. 6F, when the welding of the negative electrode lead 16 is completed, an electrolytic solution is injected into the battery case 13, and the upper portion of the battery case 13 is connected so that the sealing lid 19 and the positive electrode lead 17 are connected. Attach the lid 19 to the.

図６（ｇ）に示すように、組み立て終った円筒電池１０の電池ケース１３の底板１３ａは、円筒電池１０の負極端子１２となり、封口蓋１９は、円筒電池１０の正極端子１１となる。また、外面のマーク１４は、図６（ｈ）に示すように、負極リード１６の周方向位置を示すものとなっており、負極リード１６はマーク１４の位置から底板１３ａの中心まで向かって半径方向に延びている。   As shown in FIG. 6G, the bottom plate 13 a of the battery case 13 of the assembled cylindrical battery 10 serves as the negative terminal 12 of the cylindrical battery 10, and the sealing lid 19 serves as the positive terminal 11 of the cylindrical battery 10. The mark 14 on the outer surface indicates the circumferential position of the negative electrode lead 16 as shown in FIG. 6H, and the negative electrode lead 16 has a radius from the position of the mark 14 to the center of the bottom plate 13a. Extending in the direction.

次に、図８に示すように、散熱板２２の下側の面から円筒電池１０を散熱板２２の丸孔２２ａに挿入する。先に、図２〜５を参照して説明したように、本実施形態では、バスバー３２は、電池モジュール２０の左側から右側に向かって開口３１に延出しており、バスバー３２の位置は電池モジュール２０の前側寄りに配置されている。そこで、負極リード１６の延びる方向とバスバー３２の延出する方向とが重ならず、負極リード１６の先端がバスバー３２からできるだけ離れるように、マーク１４を電池モジュール２０の後側にして円筒電池１０を丸孔２２ａに挿入する。そして、図３を参照して説明したように、円筒電池１０の外径を接着剤３８で散熱板２２に固定する。   Next, as shown in FIG. 8, the cylindrical battery 10 is inserted into the round hole 22 a of the heat dissipation plate 22 from the lower surface of the heat dissipation plate 22. As described above with reference to FIGS. 2 to 5, in the present embodiment, the bus bar 32 extends to the opening 31 from the left side to the right side of the battery module 20, and the position of the bus bar 32 is 20 are arranged near the front side. Therefore, the mark 14 is set on the rear side of the battery module 20 so that the direction in which the negative electrode lead 16 extends does not overlap with the direction in which the bus bar 32 extends, and the tip of the negative electrode lead 16 is as far away from the bus bar 32 as possible. Into the round hole 22a. Then, as described with reference to FIG. 3, the outer diameter of the cylindrical battery 10 is fixed to the heat dissipation plate 22 with the adhesive 38.

全ての円筒電池１０を丸孔２２ａに挿入して散熱板２２に固定したら、散熱板２２の下側、つまり、電池モジュール２０の下側から図５を参照して説明した負極バスバーアセンブルを取り付ける。すると、図９に示すように、バスバー３２の延出する方向と負極リード１６の延びる方向は、９０°ずれてバスバー３２と負極リード１６とは互いに重ならない位置関係となる。また、負極リード１６は、バスバー３２と開口３１との距離が大きい電池モジュール２０の後側に位置している。このため、負極リード１６の先端と、バスバー３２の先端との間には、水平方向に距離ｄだけ隙間ができる。距離ｄは、例えば、１ｍｍ程度であってもよい。   After all the cylindrical batteries 10 are inserted into the round holes 22 a and fixed to the heat dissipation plate 22, the negative electrode busbar assembly described with reference to FIG. 5 is attached from below the heat dissipation plate 22, that is, from below the battery module 20. Then, as shown in FIG. 9, the direction in which the bus bar 32 extends and the direction in which the negative electrode lead 16 extends are shifted by 90 °, so that the bus bar 32 and the negative electrode lead 16 have a positional relationship such that they do not overlap with each other. Further, the negative electrode lead 16 is located on the rear side of the battery module 20 where the distance between the bus bar 32 and the opening 31 is large. For this reason, a gap is formed in the horizontal direction by a distance d between the tip of the negative electrode lead 16 and the tip of the bus bar 32. The distance d may be, for example, about 1 mm.

この後、バスバー３２の先端中央の凹部３２ａに電極棒４１を当て、バスバー３２と電池ケース１３の底板１３ａとの間に電流を流し、バスバー３２と底板１３ａの外面との間を溶接する。バスバー３２と負極リード１６との間には１ｍｍ程度の距離があるので、溶接電流は底板１３ａと負極リード１６との間に分流せず、底板１３ａの温度が上昇して底板１３ａが損傷することを抑制することができる。   Thereafter, the electrode rod 41 is applied to the concave portion 32a at the center of the end of the bus bar 32, an electric current flows between the bus bar 32 and the bottom plate 13a of the battery case 13, and the bus bar 32 and the outer surface of the bottom plate 13a are welded. Since there is a distance of about 1 mm between the bus bar 32 and the negative electrode lead 16, the welding current does not flow between the bottom plate 13a and the negative electrode lead 16, and the temperature of the bottom plate 13a rises and the bottom plate 13a is damaged. Can be suppressed.

以上説明した実施形態では、バスバー３２の延出する方向と円筒電池１０の内部の負極リード１６の延びる方向とが９０°ずれるように、マーク１４を電池モジュール２０の後側にして円筒電池１０を散熱板２２の丸孔２２ａに挿入することとして説明したが、バスバー３２の延出方向と負極リード１６の延びる方向とが重ならない範囲で、バスバー３２と負極リード１６との間に１ｍｍ程度の距離ができるなら、例えば、マーク１４を電池モジュール２０の後側から右側に４５°程度まで、あるいは左側に４５°程度まで傾けた範囲として円筒電池１０を散熱板２２に挿入してもよい。   In the embodiment described above, the cylindrical battery 10 is placed on the rear side of the battery module 20 such that the direction in which the bus bar 32 extends and the direction in which the negative electrode lead 16 extends inside the cylindrical battery 10 are shifted by 90 °. Although the insertion is described as being inserted into the round hole 22a of the heat dissipating plate 22, the distance between the bus bar 32 and the negative electrode lead 16 is about 1 mm as long as the extending direction of the bus bar 32 and the extending direction of the negative electrode lead 16 do not overlap. For example, the cylindrical battery 10 may be inserted into the heat dissipating plate 22 in a range in which the mark 14 is inclined from the rear side of the battery module 20 to about 45 ° to the right or about 45 ° to the left.

また、先に説明した電池モジュール２０と異なり、バスバー３２が電池モジュール２０の右側から左側に向かって開口３１の内側に延出していても、バスバー３２が円形の開口３１の中心よりも電池モジュール２０の前側に寄った位置に取り付けられている場合には、バスバー３２と開口３１との前後方向の距離は、電池モジュール２０の後側が前側よりも大きくなるので、上記実施形態と同様、マーク１４を電池モジュール２０の後側にして円筒電池１０を散熱板２２の丸孔２２ａに挿入してもよい。   Also, unlike the battery module 20 described above, even if the bus bar 32 extends from the right side to the left side of the battery module 20 toward the inside of the opening 31, the bus bar 32 is larger than the center of the circular opening 31. When the battery module 20 is mounted at a position closer to the front side of the battery module 20, the distance between the bus bar 32 and the opening 31 in the front-rear direction is larger on the rear side of the battery module 20 than on the front side. The cylindrical battery 10 may be inserted into the round hole 22 a of the heat dissipation plate 22 on the rear side of the battery module 20.

一方、バスバー３２が円形の開口３１の中心よりも電池モジュール２０の後側に寄った位置に取り付けられている場合には、バスバー３２と開口３１との前後方向の距離は、電池モジュール２０の前側が後側よりも大きくなるので、上記実施形態とは逆に、マーク１４の位置を電池モジュール２０の前側、あるいは、前側から右側に４５°程度まで、あるいは左側に４５°程度まで傾けた範囲として円筒電池１０を散熱板２２の丸孔２２ａに挿入してもよい。   On the other hand, when the bus bar 32 is mounted at a position closer to the rear side of the battery module 20 than the center of the circular opening 31, the distance between the bus bar 32 and the opening 31 in the front-rear direction is Since the side is larger than the rear side, contrary to the above embodiment, the position of the mark 14 is set to the front side of the battery module 20, or to a range inclined to about 45 ° to the right from the front side, or to about 45 ° to the left side. The cylindrical battery 10 may be inserted into the round hole 22a of the heat dissipation plate 22.

つまり、バスバー３２と負極リード１６との間に所定の距離ができるようにするには、バスバー３２と開口３１との距離が大きい側で、バスバー３２の延びる方向と負極リード１６の延びる方向とが所定角度だけずれる範囲に円筒電池１０のマーク１４が位置するようにして円筒電池１０を散熱板２２の丸孔２２ａに挿入すればよい。   That is, in order to allow a predetermined distance between the bus bar 32 and the negative electrode lead 16, the direction in which the bus bar 32 extends and the direction in which the negative electrode lead 16 extends on the side where the distance between the bus bar 32 and the opening 31 is large. The cylindrical battery 10 may be inserted into the round hole 22 a of the heat dissipating plate 22 so that the mark 14 of the cylindrical battery 10 is located in a range shifted by a predetermined angle.

以上説明したように、本実施形態の電池モジュール２０の製造方法は、円筒電池１０に負極リード１６の方向を示すマーク１４を設けておき、このマーク１４に基づいて、負極リード１６とバスバー３２とが重ならず、その間が所定距離だけ離れるように円筒電池１０と負極バスバーアセンブリ３０とを散熱板２２に取り付けて、バスバー３２と電池ケース１３の底板１３ａとを溶接するので、溶接電流の底板１３ａと負極リード１６との間へ分流を抑制することができる。このため、バスバー３２と底板１３ａの溶接の際に底板１３ａの温度が上昇して底板１３ａが損傷することを抑制することができる。   As described above, in the method of manufacturing the battery module 20 of the present embodiment, the mark 14 indicating the direction of the negative electrode lead 16 is provided on the cylindrical battery 10, and the negative electrode lead 16 and the bus bar 32 are formed based on the mark 14. The cylindrical battery 10 and the negative electrode bus bar assembly 30 are attached to the heat dissipating plate 22 so that the bus bar 32 and the bottom plate 13a of the battery case 13 are welded so that the gap does not overlap, and the bus bar 32 and the bottom plate 13a of the battery case 13 are welded. And the negative flow can be suppressed. Therefore, it is possible to prevent the temperature of the bottom plate 13a from rising when the bus bar 32 and the bottom plate 13a are welded, thereby preventing the bottom plate 13a from being damaged.

以上説明した実施形態では、電池ケース１３の外面に予め塗装等でマーク１４を設けておき、電極巻回体１５の負極リード１６の周方向位置をマーク１４に合わせて電極巻回体１５を電池ケース１３に挿入することで、マーク１４が負極リード１６の周方向位置を示すようにすることとして説明したが、円筒電池１０の組み立て中に負極リード１６の方向を確認しておき、円筒電池１０の組み立て後に電池ケース１３の外面に塗装、刻印等でマーク１４を設けてもよい。また、円筒電池１０の組み立て後に封口蓋１９に刻印等でマーク１４を設けてもよい。   In the embodiment described above, the mark 14 is provided in advance on the outer surface of the battery case 13 by painting or the like, and the circumferential position of the negative electrode lead 16 of the electrode wound body 15 is aligned with the mark 14 so that the electrode wound body 15 is Although it has been described that the mark 14 indicates the circumferential position of the negative electrode lead 16 by being inserted into the case 13, the direction of the negative electrode lead 16 is checked during the assembly of the cylindrical battery 10, and After assembling, the mark 14 may be provided on the outer surface of the battery case 13 by painting, stamping, or the like. Further, the mark 14 may be provided on the sealing lid 19 by engraving or the like after the cylindrical battery 10 is assembled.

また、本実施形態では、電極巻回体１５の負極リード１６を電池ケース１３の底板１３ａの内面に溶接することとして説明したが、本発明は、正極リード１７を電池ケース１３の底板１３ａの内面に溶接する場合にも適用できる。   Further, in the present embodiment, the negative electrode lead 16 of the electrode winding body 15 has been described as being welded to the inner surface of the bottom plate 13a of the battery case 13, but the present invention provides that the positive electrode lead 17 is welded to the inner surface of the bottom plate 13a of the battery case 13. It can also be applied when welding to steel.

１０ 円筒電池、１１ 正極端子、１２ 負極端子、１３ 電池ケース、１３ａ 底板
１４ マーク、１５ 電極巻回体、１６ 負極リード、１７ 正極リード、１８ 孔、１９ 封口蓋、２０ 電池モジュール、２２ 散熱板、２２ａ 丸孔、２３ カバー、２３ａ 天井板、２３ｂ 四角筒、２３ｃ 穴、２４ 天井蓋、２５ 底蓋、２６ 正極バスバー板、３０ 負極バスバーアセンブリ、３１ 開口、３２ バスバー、３２ａ 凹部
３３ 樹脂、３４，３４Ａ，３４Ｂ，３４Ｃ 負極バスバー板、３８ 接着剤、４１ 電極棒、１２１ 負極板、１２１ａ 集電箔、１２１ｂ 負極活物質層、１２２ 正極板、１２２ａ 集電箔、１２２ｂ 正極活物質層、１２３，１２４ セパレータ。 Reference Signs List 10 cylindrical battery, 11 positive electrode terminal, 12 negative electrode terminal, 13 battery case, 13a bottom plate 14 mark, 15 electrode winding body, 16 negative electrode lead, 17 positive electrode lead, 18 holes, 19 sealing lid, 20 battery module, 22 heat sink, 22a round hole, 23 cover, 23a ceiling plate, 23b square tube, 23c hole, 24 ceiling cover, 25 bottom cover, 26 positive bus bar plate, 30 negative bus bar assembly, 31 opening, 32 bus bar, 32a recess 33 resin, 34, 34A , 34B, 34C negative electrode busbar plate, 38 adhesive, 41 electrode rod, 121 negative electrode plate, 121a current collector foil, 121b negative electrode active material layer, 122 positive electrode plate, 122a current collector foil, 122b positive electrode active material layer, 123, 124 separator .

Claims (1)

正極板と負極板とをセパレータを介して円筒状に巻回した電極巻回体と前記電極巻回体を収容する有底円筒型の電池ケースとを含む円筒電池と、
前記円筒電池の外径が固定される丸孔を有する散熱板と、
前記散熱板に取り付けられるバスバーアセンブリと、を備え、
前記電極巻回体が前記負極板から引き出され、前記電池ケースの底板内面に溶接される負極リードを含み、
前記円筒電池は、外面に前記負極リードの位置を示すマークを有し、
前記バスバーアセンブリが前記丸孔の配置に合わせて設けられた開口と前記開口の周縁から前記開口の内側に向かって延出するバスバーとを含む、電池モジュールの製造方法であって、
前記マークに基づいて、前記負極リードと前記バスバーとの間が所定距離だけ離れるように前記円筒電池と前記バスバーアセンブリとを前記散熱板に取り付け、
前記バスバーと前記電池ケースの底板外面とを溶接する電池モジュールの製造方法。 A cylindrical battery including an electrode winding body in which a positive electrode plate and a negative electrode plate are wound in a cylindrical shape via a separator, and a bottomed cylindrical battery case accommodating the electrode winding body,
A heat dissipation plate having a round hole to which the outer diameter of the cylindrical battery is fixed,
A bus bar assembly attached to the heat spreader,
The electrode winding body is pulled out from the negative electrode plate, and includes a negative electrode lead welded to a bottom plate inner surface of the battery case,
The cylindrical battery has a mark indicating a position of the negative electrode lead on an outer surface,
A method for manufacturing a battery module, wherein the bus bar assembly includes an opening provided in accordance with the arrangement of the round hole, and a bus bar extending from a peripheral edge of the opening toward the inside of the opening,
Based on the mark, the cylindrical battery and the bus bar assembly are attached to the heat spreader so that the negative electrode lead and the bus bar are separated by a predetermined distance,
A method for manufacturing a battery module, wherein the bus bar is welded to an outer surface of a bottom plate of the battery case.
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