JP2021089788A

JP2021089788A - Battery pack

Info

Publication number: JP2021089788A
Application number: JP2019217697A
Authority: JP
Inventors: 佑介田口; Yusuke Taguchi
Original assignee: Kojima Press Industry Co Ltd
Current assignee: Kojima Industries Corp
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2021-06-10
Anticipated expiration: 2039-12-02
Also published as: JP7309588B2

Abstract

To provide a battery pack that can achieve at least one of the ability to suppress an increase in a load applied from a resin frame to a battery cell when the battery cell expands and the ability to suppress the variation in surface pressure from the resin frame to the battery cell.SOLUTION: A resin frame 30 sandwiched between a first battery cell 20a and a second battery cell 20b arranged in the cell stacking direction D1 includes a wavy portion 32 in which a first convex portion 32a directed toward the first battery cell 20a and a second convex portion 32b directed toward the second battery cell 20b alternately repeat, a first rib 33 protruding from a part of the plurality of first convex portions 32a, and a second rib 34 protruding from a part of the plurality of second convex portions 32b. The first rib 33 and the second rib 34 are alternately set by interposing an even number of ribless convex portions 32c. The number of ribless convex portion 32c is the same between the adjacent first ribs 33 and second ribs 34, respectively.SELECTED DRAWING: Figure 4

Description

本発明は、セル積層方向に並ぶ第１電池セルと第２電池セルとに挟まれる樹脂枠を有する組電池に関する。 The present invention relates to an assembled battery having a resin frame sandwiched between a first battery cell and a second battery cell arranged in the cell stacking direction.

セル積層方向に並ぶ第１電池セルと第２電池セルとに挟まれる組電池用の樹脂枠は、たとえば特許文献１（特開２００９−２７７４７１号公報）に開示されている。特許文献１は、樹脂枠（電池ホルダ）の電池セルに接触する部分が、断面視で櫛歯状もしくは平面状となっている技術を開示している。 A resin frame for an assembled battery sandwiched between a first battery cell and a second battery cell arranged in the cell stacking direction is disclosed in, for example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2009-277471). Patent Document 1 discloses a technique in which a portion of a resin frame (battery holder) in contact with a battery cell is comb-shaped or flat in cross-sectional view.

しかし、特許文献１に開示の技術では、樹脂枠が中実（内部に空隙が設けられていない構造）になっており、樹脂枠には電池セルの膨張時に圧縮荷重がかかるようになっている。そのため、電池セルの膨張時にあっても、樹脂枠はほとんど変形せず、樹脂枠で電池セルの変形を吸収することは困難である。その結果、電池セル膨張時に樹脂枠から電池セルにかかる荷重（拘束荷重）の増加量が大きくなり、電池セルの適正な性能を維持することが困難になるおそれがある。 However, in the technique disclosed in Patent Document 1, the resin frame is solid (a structure in which no voids are provided inside), and a compressive load is applied to the resin frame when the battery cell expands. .. Therefore, even when the battery cell is expanded, the resin frame is hardly deformed, and it is difficult for the resin frame to absorb the deformation of the battery cell. As a result, the amount of increase in the load (restraint load) applied from the resin frame to the battery cell when the battery cell expands becomes large, and it may be difficult to maintain the proper performance of the battery cell.

上記特許文献１の問題を解消できる技術として、特許文献２（特開２０１７−１８３０７１号公報）に開示される技術がある。特許文献２は、樹脂枠（スペーサ）が断面視で第１〜第６突部を有する波状となっている技術を開示している。この特許文献２に開示の技術によれば、電池セルの膨張時には、樹脂枠（第１〜第６突部）が変形することで電池セルの膨張を吸収して樹脂枠から電池セルにかかる荷重の増加を抑えることができる。すなわち、特許文献１に存在する上記問題点（樹脂枠から電池セルにかかる荷重の増加量が大）を解消できる。 As a technique capable of solving the problem of Patent Document 1, there is a technique disclosed in Patent Document 2 (Japanese Unexamined Patent Publication No. 2017-183071). Patent Document 2 discloses a technique in which a resin frame (spacer) has a wavy shape having first to sixth protrusions in a cross-sectional view. According to the technique disclosed in Patent Document 2, when the battery cell is expanded, the resin frame (first to sixth protrusions) is deformed to absorb the expansion of the battery cell and the load applied from the resin frame to the battery cell. Can be suppressed. That is, the above-mentioned problem (the amount of increase in the load applied from the resin frame to the battery cell is large) existing in Patent Document 1 can be solved.

しかし、特許文献２開示の技術には、つぎの問題点がある。
電池セルが膨張していないとき、第１〜第６の全ての突部が電池セルに当たる構造にはなっていない。具体的には、電池セルが膨張していないとき、樹脂枠の第１〜第４突部のみが電池セルに当たるようになっており、樹脂枠の第５、第６突部は電池セルに当たっていない。樹脂枠の第５、第６突部は、電池セルの膨張時にのみ電池セルに当たるようになっている。そのため、電池セルが膨張していないとき、樹脂枠と電池セルとの接触部が等ピッチにならず、樹脂枠から電池セルへの面圧バラつきが生じて局所的に電池セルが劣化するおそれがある。 However, the technique disclosed in Patent Document 2 has the following problems.
When the battery cell is not inflated, all the first to sixth protrusions are not structured to hit the battery cell. Specifically, when the battery cell is not expanded, only the first to fourth protrusions of the resin frame hit the battery cell, and the fifth and sixth protrusions of the resin frame do not hit the battery cell. .. The fifth and sixth protrusions of the resin frame come into contact with the battery cell only when the battery cell is expanded. Therefore, when the battery cell is not expanded, the contact portions between the resin frame and the battery cell do not have an equal pitch, and the surface pressure from the resin frame to the battery cell varies, which may cause local deterioration of the battery cell. is there.

特開２００９−２７７４７１号公報Japanese Unexamined Patent Publication No. 2009-277471 特開２０１７−１８３０７１号公報JP-A-2017-183071

本発明の目的は、電池セルの膨張時に樹脂枠から電池セルにかかる荷重の増加を抑制できること、樹脂枠から電池セルへの面圧バラつきが生じることを抑制できること、の少なくとも一方を達成できる、組電池を提供することにある。 An object of the present invention is to be able to achieve at least one of being able to suppress an increase in the load applied from the resin frame to the battery cell when the battery cell is expanded and being able to suppress variation in surface pressure from the resin frame to the battery cell. It is to provide batteries.

上記目的を達成する本発明はつぎの通りである。
（１）セル積層方向に並ぶ第１電池セルと第２電池セルとに挟まれる樹脂枠を有しており、
前記樹脂枠は、
前記第１電池セルに向けた第１凸部と前記第２電池セルに向けた第２凸部がセル積層直交方向に交互に繰り返す波状部と、
複数の前記第１凸部の一部から前記第１電池セルに向けて突出しており突出方向先端部で前記第１電池セルに当接する第１リブと、
複数の前記第２凸部の一部から前記第２電池セルに向けて突出しており突出方向先端部で前記第２電池セルに当接する第２リブと、
を有しており、
前記第１リブと前記第２リブは、前記第１、第２リブが設けられていないリブ無しの凸部を偶数個介在させて、前記セル積層直交方向に交互に設定されており、
前記リブ無しの凸部の数は、隣り合うそれぞれの前記第１リブと前記第２リブの間で同数である、組電池。
（２）前記第１リブと前記第２リブの剛性は、前記波状部の剛性に比べて大とされている、（１）記載の組電池。
（３）前記第１電池セルおよび前記第２電池セルは、角型の電池セルであり、
前記樹脂枠は、前記第１電池セルと前記第２電池セルの間にあり前記第１電池セルの外周部と前記第２電池セルの外周部に当接する電池押さえ部を有しており、該電池押さえ部の剛性は、前記波状部の剛性に比べて大とされている、（１）または（２）記載の組電池。
（４）前記樹脂枠が前記第１、第２電池セルに挟まれていないとき、前記第１、第２リブは前記電池押さえ部よりも高く設定されており、前記樹脂枠が前記第１、第２電池セルに挟まれているとき、前記第１、第２リブと前記電池押さえ部はともに前記第１、第２電池セルに当接している、（３）記載の組電池。 The present invention that achieves the above object is as follows.
(1) It has a resin frame sandwiched between the first battery cell and the second battery cell arranged in the cell stacking direction.
The resin frame is
A wavy portion in which the first convex portion toward the first battery cell and the second convex portion toward the second battery cell alternately repeat in the direction orthogonal to the cell stacking.
A first rib that projects from a part of the plurality of first convex portions toward the first battery cell and abuts on the first battery cell at the tip portion in the projecting direction.
A second rib that projects from a part of the plurality of second convex portions toward the second battery cell and abuts on the second battery cell at the tip portion in the projecting direction.
Have and
The first rib and the second rib are alternately set in the cell stacking orthogonal direction by interposing an even number of ribless convex portions on which the first and second ribs are not provided.
An assembled battery in which the number of ribless protrusions is the same between the adjacent first ribs and the second ribs.
(2) The assembled battery according to (1), wherein the rigidity of the first rib and the second rib is larger than the rigidity of the wavy portion.
(3) The first battery cell and the second battery cell are square battery cells.
The resin frame has a battery holding portion that is located between the first battery cell and the second battery cell and is in contact with the outer peripheral portion of the first battery cell and the outer peripheral portion of the second battery cell. The assembled battery according to (1) or (2), wherein the rigidity of the battery holding portion is larger than the rigidity of the wavy portion.
(4) When the resin frame is not sandwiched between the first and second battery cells, the first and second ribs are set higher than the battery holding portion, and the resin frame is set higher than the first and second battery holding portions. The assembled battery according to (3), wherein the first and second ribs and the battery holding portion are both in contact with the first and second battery cells when sandwiched between the second battery cells.

上記（１）の組電池では、第１電池セルに向けた第１凸部と前記第２電池セルに向けた第２凸部がセル積層直交方向に交互に繰り返す波状部が設けられているため、波状部が曲げ弾性変形することによる弾性力（復元力）により、樹脂枠から第１、第２電池セルにセル積層方向に荷重（拘束荷重）を付与することができる。また、第１電池セルおよび／または第２電池セルの膨張時には、波状部がさらに曲げ弾性変形することで、第１電池セルおよび／または第２電池セルの膨張を吸収できる。ここで、一般的に曲げ変形に要する荷重は圧縮変形に要する荷重よりも小さい。そのため、第１電池セルおよび／または第２電池セルが膨張しても樹脂枠から第１電池セルおよび第２電池セルにかかる荷重の増加を抑制できる。 Since the assembled battery of (1) is provided with a wavy portion in which the first convex portion toward the first battery cell and the second convex portion toward the second battery cell alternately repeat in the cell stacking orthogonal direction. A load (constraining load) can be applied from the resin frame to the first and second battery cells in the cell stacking direction by the elastic force (restoring force) caused by the bending elastic deformation of the wavy portion. Further, when the first battery cell and / or the second battery cell expands, the wavy portion further bends and elastically deforms, so that the expansion of the first battery cell and / or the second battery cell can be absorbed. Here, the load required for bending deformation is generally smaller than the load required for compressive deformation. Therefore, even if the first battery cell and / or the second battery cell expands, it is possible to suppress an increase in the load applied to the first battery cell and the second battery cell from the resin frame.

また、第１リブと第２リブがセル積層直交方向に交互に設定されているため、樹脂枠から第１電池セルと第２電池セルの両方にかかる荷重を等しく（ほぼ等しくを含む）することができる。さらに、第１リブと第２リブとの間に介在されるリブ無し凸部の数が、隣り合うそれぞれの第１リブと第２リブの間で同数であるため、隣り合うそれぞれの第１リブと第２のリブとの間の距離（リブ間ピッチ）を等ピッチ（ほぼ等ピッチを含む）にすることができる。よって、樹脂枠と第１、第２電池セルとの接触部が等ピッチになり、樹脂枠から第１、第２電池セルへの面圧バラつきが生じることを抑制できる。 Further, since the first rib and the second rib are alternately set in the direction orthogonal to the cell stacking, the loads applied to both the first battery cell and the second battery cell from the resin frame should be equalized (including substantially equal). Can be done. Further, since the number of ribless convex portions interposed between the first rib and the second rib is the same between the adjacent first rib and the second rib, each adjacent first rib The distance between the rib and the second rib (pitch between ribs) can be made equal pitch (including substantially equal pitch). Therefore, the contact portions between the resin frame and the first and second battery cells have an equal pitch, and it is possible to suppress the occurrence of surface pressure variation from the resin frame to the first and second battery cells.

上記（２）の組電池では、第１リブと第２リブの剛性が、波状部の剛性に比べて大とされているため、波状部ではなく第１、第２リブが変形してしまうことを抑制できる。その結果、波状部による曲げ弾性変形力で第１、第２電池セルを拘束でき、所定の拘束荷重で精度よく第１、第２電池セルを拘束できる。 In the assembled battery of (2) above, since the rigidity of the first rib and the second rib is larger than the rigidity of the wavy portion, the first and second ribs are deformed instead of the wavy portion. Can be suppressed. As a result, the first and second battery cells can be restrained by the bending elastic deformation force due to the wavy portion, and the first and second battery cells can be restrained accurately with a predetermined restraining load.

上記（３）の組電池では、つぎの効果を得ることができる。
角型の電池セルにあっては、電池セルの膨張率は、セル積層方向から見たときの電池セルの中央部が最も大きく、電池セルの外周部にいくにしたがって小さくなり、電池セルの外周部でゼロまたはほぼゼロである。ここで本発明では、樹脂枠が第１、第２電池セルのそれぞれの外周部に当接する電池押さえ部を有している。そのため、第１、第２電池セルの膨張時であっても、第１、第２電池セルの外周部と電池押さえ部は膨張の影響が無いかあっても無視できる程度であり、第１、第２電池セルの外周部と電池押さえ部のセル積層方向の位置がズレることが抑制される。よって、第１電池セルおよび／または第２電池セルの膨張時に第１、第２電池セルのそれぞれの端子位置がセル積層方向にズレることを抑制できる。 With the assembled battery of (3) above, the following effects can be obtained.
In a square battery cell, the expansion coefficient of the battery cell is the largest at the center of the battery cell when viewed from the cell stacking direction, and decreases toward the outer periphery of the battery cell, and becomes smaller toward the outer periphery of the battery cell. The part is zero or almost zero. Here, in the present invention, the resin frame has a battery holding portion that abuts on the outer peripheral portions of the first and second battery cells. Therefore, even when the first and second battery cells are expanded, the outer peripheral portions of the first and second battery cells and the battery holding portion are negligible even if they are not affected by the expansion. It is possible to prevent the outer peripheral portion of the second battery cell and the battery holding portion from being displaced from each other in the cell stacking direction. Therefore, it is possible to prevent the terminal positions of the first and second battery cells from shifting in the cell stacking direction when the first battery cell and / or the second battery cell expands.

上記（４）の組電池では、樹脂枠が第１、第２電池セルに挟まれていないとき、第１、第２リブは電池押さえ部よりも高く設定されており、樹脂枠が第１、第２電池セルに挟まれているとき、第１、第２リブと電池押さえ部はともに第１、第２電池セルに当接しているため、樹脂枠が第１、第２電池セルに挟まれたときに、第１、第２凸部を確実に曲げ弾性変形させることができ、この弾性変形による拘束荷重を第１、第２電池セルに付与することができる。 In the assembled battery of (4) above, when the resin frame is not sandwiched between the first and second battery cells, the first and second ribs are set higher than the battery holding portion, and the resin frame is set to be higher than the battery holding portion. When sandwiched between the second battery cells, the first and second ribs and the battery holding portion are both in contact with the first and second battery cells, so that the resin frame is sandwiched between the first and second battery cells. At that time, the first and second convex portions can be reliably bent and elastically deformed, and the restraining load due to this elastic deformation can be applied to the first and second battery cells.

本発明実施例の組電池の部品構成を示す概略斜視図である。It is the schematic perspective view which shows the component structure of the assembled battery of the Example of this invention. 本発明実施例の組電池における樹脂枠と電池セルを、セル積層方向から見たときの正面図である。It is a front view when the resin frame and the battery cell in the assembled battery of the Example of this invention are seen from the cell stacking direction. 図２のＡ−Ａ線拡大断面図である。FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 図３のＢ部拡大図である。FIG. 3 is an enlarged view of part B in FIG. 図３のＣ部拡大図である。It is the C part enlarged view of FIG. 図３のＤ部拡大図である。FIG. 3 is an enlarged view of part D in FIG. 本発明実施例の組電池における波状部の部分断面図である。（ａ）は、電池セルが膨張していないときを示す。（ｂ）は、電池セルが膨張したときを示す。It is a partial sectional view of the wavy part in the assembled battery of the Example of this invention. (A) indicates when the battery cell is not expanding. (B) shows when the battery cell expands. 本発明実施例の組電池の一部と、本発明実施例とは異なる比較例の組電池の一部を示す、模式図である。（ａ１）は、本発明実施例の組電池の一部であって、電池セルが膨張していないときを示す。（ａ２）は、本発明実施例の組電池の一部であって、電池セルが膨張したときを示す。（ｂ１）は、比較例の組電池の一部であって、電池セルが膨張していないときを示す。（ｂ２）は、比較例の組電池の一部であって、電池セルが膨張したときを示す。It is a schematic diagram which shows a part of the assembled battery of the Example of this invention, and a part of the assembled battery of the comparative example different from the Example of this invention. (A1) is a part of the assembled battery of the embodiment of the present invention, and indicates a case where the battery cell is not expanded. (A2) is a part of the assembled battery according to the embodiment of the present invention, and indicates when the battery cell is expanded. (B1) is a part of the assembled battery of the comparative example, and shows the case where the battery cell is not expanded. (B2) is a part of the assembled battery of the comparative example, and shows the time when the battery cell is expanded. 本発明実施例の組電池における樹脂枠の、第１、第２電池セルに挟まれる前の自由状態にあるときの部分断面図である。It is a partial cross-sectional view of the resin frame in the assembled battery of the Example of the present invention when it is in a free state before being sandwiched between the first and second battery cells.

以下に、図面を参照して、本発明実施例の組電池を説明する。 Hereinafter, the assembled battery of the embodiment of the present invention will be described with reference to the drawings.

図１は、本発明実施例の組電池１０の部品構成斜視図である。本発明実施例の組電池１０は、ガソリンエンジンやディーゼルエンジン等の内燃機関と充放電可能な２次電池とを動力源とするハイブリッド自動車や、外部充電が可能なプラグインハイブリッド自動車、電気自動車等に搭載される。 FIG. 1 is a perspective view of a component configuration of the assembled battery 10 according to the embodiment of the present invention. The assembled battery 10 of the embodiment of the present invention includes a hybrid vehicle powered by an internal combustion engine such as a gasoline engine or a diesel engine and a rechargeable secondary battery, a plug-in hybrid vehicle capable of external charging, an electric vehicle, or the like. It is installed in.

組電池１０は、複数の電池セル２０と、複数の樹脂枠３０と、を有しており、電池セル２０と樹脂枠３０を交互にセル積層方向Ｄ１に積層させた構造を有している。 The assembled battery 10 has a plurality of battery cells 20 and a plurality of resin frames 30, and has a structure in which the battery cells 20 and the resin frames 30 are alternately laminated in the cell stacking direction D1.

電池セル２０と樹脂枠３０の積層体のセル積層方向Ｄ１の両外側には、それぞれ、組電池１０の構成部材であるエンドプレート４０が配置されており、該エンドプレート４０によって電池セル２０と樹脂枠３０の積層体は両外側から挟まれている。それぞれのエンドプレート４０同士は、図示略の拘束バンドにて繋がれており、これにより電池セル２０と樹脂枠３０の積層体はセル積層方向Ｄ１に拘束荷重が掛けられた状態にある。 End plates 40, which are constituent members of the assembled battery 10, are arranged on both outer sides of the cell stacking direction D1 of the laminated body of the battery cell 20 and the resin frame 30, respectively, and the battery cell 20 and the resin are arranged by the end plates 40. The laminated body of the frame 30 is sandwiched from both outer sides. The end plates 40 are connected to each other by a restraint band (not shown), whereby the laminated body of the battery cell 20 and the resin frame 30 is in a state where a restraint load is applied in the cell stacking direction D1.

電池セル２０は、リチウムイオン電池である。電池セル２０は、セル積層方向Ｄ１から見たときに（電池セル２０の正面視で）略矩形状を有する角型の電池セルである。電池セル２０は、アルミニウム製のセルケース２１およびセルケース２１の開口を塞ぐ蓋部２２を有する。セルケース２１は、矩形の開口部を有する扁平直方箱体であり、内部に電解液と共に電極体が収容されている。蓋部２２は矩形板状であり、セルケース２１の開口部を閉塞するようにしてセルケース２１に溶接されている。蓋部２２には、セルケース２１の内部で電極体の正極や負極に電気的に接続される２つの端子２３，２４が貫通して支持されている。 The battery cell 20 is a lithium ion battery. The battery cell 20 is a square battery cell having a substantially rectangular shape (when viewed from the front of the battery cell 20) when viewed from the cell stacking direction D1. The battery cell 20 has an aluminum cell case 21 and a lid 22 that closes the opening of the cell case 21. The cell case 21 is a flat rectangular box having a rectangular opening, and an electrode body is housed inside the cell case 21 together with an electrolytic solution. The lid portion 22 has a rectangular plate shape and is welded to the cell case 21 so as to close the opening of the cell case 21. Two terminals 23 and 24 electrically connected to the positive electrode and the negative electrode of the electrode body are penetrated and supported in the lid portion 22 inside the cell case 21.

図３に示すように、樹脂枠３０は、セル積層方向Ｄ１に並んでおり互いに隣り合う２つの電池セル２０，２０（以下、第１電池セル２０ａ、第２電池セル２０ｂという）の間に挟まれて配置されている。樹脂枠３０は、絶縁性材料から形成されており第１、第２電池セル２０ａ、２０ｂ間を電気的に絶縁している。樹脂枠３０は型成形品であり一部品構成である。樹脂枠３０は、樹脂製であり、たとえばポリプロピレン樹脂製である。 As shown in FIG. 3, the resin frame 30 is sandwiched between two battery cells 20, 20 (hereinafter, referred to as a first battery cell 20a and a second battery cell 20b) that are arranged in the cell stacking direction D1 and are adjacent to each other. Is placed. The resin frame 30 is formed of an insulating material and electrically insulates between the first and second battery cells 20a and 20b. The resin frame 30 is a molded product and is composed of one part. The resin frame 30 is made of resin, for example, polypropylene resin.

樹脂枠３０は、外枠部３１と、波状部３２と、第１リブ３３と、第２リブ３４と、連結部３５と、電池押さえ部３６と、を有する。 The resin frame 30 has an outer frame portion 31, a wavy portion 32, a first rib 33, a second rib 34, a connecting portion 35, and a battery holding portion 36.

外枠部３１は、セル積層方向Ｄ１から見たときに、第１、第２電池セル２０ａ、２０ｂよりも外側にある。外枠部３１は、第１、第２電池セル２０ａ、２０ｂにおけるそれぞれの、セルケース２１の下底部２１ａおよび左右側面の少なくとも一部と、蓋部２２の少なくとも一部と、を覆うようにして設けられている。 The outer frame portion 31 is outside the first and second battery cells 20a and 20b when viewed from the cell stacking direction D1. The outer frame portion 31 covers at least a part of the lower bottom portion 21a and the left and right side surfaces of the cell case 21 and at least a part of the lid portion 22 in the first and second battery cells 20a and 20b, respectively. It is provided.

波状部３２は、セル積層方向Ｄ１から見たときに、第１、第２電池セル２０ａ、２０ｂの内側にある。波状部３２は、セル積層方向Ｄ１から見たときに、第１、第２電池セル２０ａ、２０ｂの内部にある電極体が接触するセルケース２１部分の全域またはほぼ全域にわたって設けられている。 The wavy portion 32 is inside the first and second battery cells 20a and 20b when viewed from the cell stacking direction D1. The wavy portion 32 is provided over the entire area or almost the entire area of the cell case 21 portion in which the electrode bodies inside the first and second battery cells 20a and 20b come into contact with each other when viewed from the cell stacking direction D1.

図４に示すように、波状部３２は、第１電池セル２０ａに向けた第１凸部３２ａと第２電池セル２０ｂに向けた第２凸部３２ｂがセル積層直交方向Ｄ２に交互に繰り返す滑らかな波状の断面形状を有する部分である。セル積層直交方向Ｄ２は、セル積層方向Ｄ１と直交する方向である。波状部３２の板厚は一定または略一定とされておりセル積層方向Ｄ１から荷重が加わった際に比較的容易に曲げ弾性変形できる程度の厚みとされている。波状部３２は、第１、第２電池セル２０ａ、２０ｂの膨張収縮にかかわらず、第１、第２電池セル２０ａ、２０ｂに直接には当接しておらず、第１、第２リブ３３，３４を介してのみ第１、第２電池セル２０ａ、２０ｂに当接している。 As shown in FIG. 4, the wavy portion 32 is smooth in which the first convex portion 32a toward the first battery cell 20a and the second convex portion 32b toward the second battery cell 20b alternately repeat in the cell stacking orthogonal direction D2. It is a part having a wavy cross-sectional shape. The cell stacking orthogonal direction D2 is a direction orthogonal to the cell stacking direction D1. The plate thickness of the wavy portion 32 is constant or substantially constant, and is set to such a thickness that it can be bent and elastically deformed relatively easily when a load is applied from the cell stacking direction D1. The wavy portion 32 does not directly contact the first and second battery cells 20a and 20b regardless of the expansion and contraction of the first and second battery cells 20a and 20b, and the first and second ribs 33, It is in contact with the first and second battery cells 20a and 20b only via 34.

第１リブ３３は、複数の第１凸部３２ａの一部からセル積層方向Ｄ１に第１電池セル２０ａに向けて突出しており突出方向先端部で第１電池セル２０ａに当接している。第１リブ３３は、成形時の型抜きを可能にするために、突出方向先端にいくにつれて先細る形状となっている。第１リブ３３は、突出方向先端部で第１電池セル２０ａに面接触している。第１リブ３３は、波状部３２に比べて厚肉であり内部に空隙が設けられていない中実のブロック状となっており、波状部３２に比べて高剛性となっている。 The first rib 33 projects from a part of the plurality of first convex portions 32a toward the first battery cell 20a in the cell stacking direction D1 and is in contact with the first battery cell 20a at the tip portion in the protruding direction. The first rib 33 has a shape that tapers toward the tip in the protruding direction in order to enable die cutting during molding. The first rib 33 is in surface contact with the first battery cell 20a at the tip end portion in the protruding direction. The first rib 33 is thicker than the wavy portion 32 and has a solid block shape with no internal voids, and has higher rigidity than the wavy portion 32.

第２リブ３４は、複数の第２凸部３２ｂの一部からセル積層方向Ｄ１に第２電池セル２０ｂに向けて突出しており突出方向先端部で第２電池セル２０ｂに当接している。第２リブ３４の波状部３２からの突出方向は、第１リブ３３の波状部３２からの突出方向と反対方向となっている。第２リブ３４は、成形時の型抜きを可能にするために、突出方向先端にいくにつれて先細る形状となっている。第２リブ３４は、突出方向先端部で第２電池セル２０ｂに面接触している。第２リブ３４は、第１リブ３３と向きが反対とされた同形状となっており、波状部３２に比べて厚肉であり内部に空隙が設けられていない中実のブロック状となっており、波状部３２に比べて高剛性となっている。 The second rib 34 projects from a part of the plurality of second convex portions 32b toward the second battery cell 20b in the cell stacking direction D1 and is in contact with the second battery cell 20b at the tip portion in the protruding direction. The protruding direction of the second rib 34 from the wavy portion 32 is opposite to the protruding direction of the first rib 33 from the wavy portion 32. The second rib 34 has a shape that tapers toward the tip in the protruding direction in order to enable die cutting during molding. The second rib 34 is in surface contact with the second battery cell 20b at the tip end portion in the protruding direction. The second rib 34 has the same shape as the first rib 33 in the opposite direction, and is thicker than the wavy portion 32 and has a solid block shape with no internal voids. It has a higher rigidity than the wavy portion 32.

第１リブ３３と第２リブ３４は、第１、第２凸部３２ａ、３２ｂのうち第１、第２リブ３３，３４のいずれも設けられていないリブ無しの凸部３２ｃを偶数個介在させて、セル積層直交方向Ｄ２に交互に設定されている。リブ無し凸部３２ｃの数は、隣り合うそれぞれの第１リブ３３と第２リブ３４の間で同数である。 The first rib 33 and the second rib 34 are provided with an even number of ribless convex portions 32c in which none of the first and second ribs 33 and 34 are provided among the first and second convex portions 32a and 32b. Therefore, the cell stacking orthogonal direction D2 is alternately set. The number of ribless convex portions 32c is the same between the adjacent first ribs 33 and the second ribs 34.

隣り合うそれぞれの第１、第２リブ３３，３４の間にあるリブ無し凸部３２ｃの数は、前述したように偶数個であるが、自然数のうち最小の偶数である２個であることが望ましい（図示例では２個の場合を示している）。これは、第１リブ３３と第２リブ３４との間に介在するリブ無し凸部３２ｃの数が４個以上の偶数個である場合に比べて、第１リブ３３と第２リブ３４との間の距離（リブ間ピッチＰ）を小さくでき、第１、第２リブ３３、３４と第１、第２電池セル２０ａ、２０ｂとの接触面積を増加させることができ、その結果、樹脂枠３０から電池セル２０にかかる荷重を分散させることができるからである。 The number of ribless convex portions 32c between the adjacent first and second ribs 33 and 34 is an even number as described above, but it may be the smallest even number of the natural numbers. Desirable (two cases are shown in the illustrated example). This is because the number of the ribless convex portions 32c interposed between the first rib 33 and the second rib 34 is an even number of four or more, and the number of the first rib 33 and the second rib 34 is increased. The distance between the ribs (pitch P between ribs) can be reduced, and the contact area between the first and second ribs 33 and 34 and the first and second battery cells 20a and 20b can be increased, and as a result, the resin frame 30 can be increased. This is because the load applied to the battery cell 20 can be dispersed.

図５、図６に示すように、連結部３５は、外枠部３１と波状部３２とを連結する部分である。連結部３５は、セル積層直交方向Ｄ２に延びている。 As shown in FIGS. 5 and 6, the connecting portion 35 is a portion that connects the outer frame portion 31 and the wavy portion 32. The connecting portion 35 extends in the cell stacking orthogonal direction D2.

電池押さえ部３６は、連結部３５に設けられている。電池押さえ部３６は、セル積層方向Ｄ１から見たときに、少なくとも一部が第１、第２電池セル２０ａ、２０ｂの内側にある。すなわち、電池押さえ部３６は、少なくとも一部が第１、第２電池セル２０ａ、２０ｂの間にある。 The battery holding portion 36 is provided in the connecting portion 35. At least a part of the battery holding portion 36 is inside the first and second battery cells 20a and 20b when viewed from the cell stacking direction D1. That is, at least a part of the battery holding portion 36 is between the first and second battery cells 20a and 20b.

電池押さえ部３６は、第１、第２電池セル２０ａ、２０ｂの充放電時など第１、第２電池セル２０ａ、２０ｂが膨張収縮する際に、形状変化が無いかほとんど無いそれぞれの電池セル２０ａ、２０ｂ部分に当接している。この、形状変化が無いかほとんど無いそれぞれの電池セル２０ａ，２０ｂ部分は、セル積層方向Ｄ１から見たときにおける、第１、第２電池セル２０ａ、２０ｂのそれぞれの外周部２０ａ１、２０ｂ１である。外周部２０ａ１，２０ｂ１は、電池セル２０ａ、２０ｂの角部（直角形状でもＲ形状でもよい）やその近傍などである。電池押さえ部３６は、第１、第２電池セル２０ａ，２０ｂのそれぞれの外周部２０ａ１，２０ｂ１の全周にわたって連続して当接していてもよく、第１、第２電池セル２０ａ、２０ｂのそれぞれの四隅のみに当接していてもよく、第１、第２電池セル２０ａ、２０ｂのそれぞれの下底部２１ａおよび蓋部２２に沿う位置（上縁および下縁）のみに当接していてもよい。 The battery holding portion 36 has no or almost no shape change when the first and second battery cells 20a and 20b expand and contract, such as when the first and second battery cells 20a and 20b are charged and discharged. , 20b is in contact with the portion. The respective battery cell 20a and 20b portions having little or no shape change are the outer peripheral portions 20a1 and 20b1 of the first and second battery cells 20a and 20b when viewed from the cell stacking direction D1. The outer peripheral portions 20a1 and 20b1 are corner portions (which may be right-angled or R-shaped) of the battery cells 20a and 20b and their vicinity. The battery holding portion 36 may be in continuous contact with each other over the entire circumference of the outer peripheral portions 20a and 20b1 of the first and second battery cells 20a and 20b, respectively, and may be in contact with the first and second battery cells 20a and 20b, respectively. It may be in contact with only the four corners of the above, or may be in contact with only the positions (upper edge and lower edge) along the lower bottom portion 21a and the lid portion 22 of the first and second battery cells 20a and 20b, respectively.

電池押さえ部３６は、スペーサとしての働きを有する。電池押さえ部３６は、波状部３２に比べて厚肉であり内部に空隙が設けられていない中実のブロック状となっており、波状部３２に比べて高剛性となっている。電池押さえ部３６は、セル積層方向Ｄ１の両端部に配置されるエンドプレート４０同士が図示略の拘束バンドにて繋がれた時（スタック時）の初期荷重で、第１、第２電池セル２０ａ、２０ｂのセル積層方向Ｄ１位置を規制（固定）している。 The battery holding portion 36 has a function as a spacer. The battery holding portion 36 is thicker than the wavy portion 32 and has a solid block shape with no internal voids, and has higher rigidity than the wavy portion 32. The battery holding portion 36 is the initial load when the end plates 40 arranged at both ends in the cell stacking direction D1 are connected by restraint bands (not shown) (when stacked), and the first and second battery cells 20a , 20b cell stacking direction D1 position is regulated (fixed).

第１、第２リブ３３，３４と電池押さえ部３６がともに、波状部３２に比べて高剛性となっているため、第１電池セル２０ａおよび／または第２電池２０ｂの膨張収縮時には、波状部３２が主に変形し、第１、第２リブ３３，３４および電池押さえ部３６は変形しないか変形しても無視できる程度となっている。 Since both the first and second ribs 33 and 34 and the battery holding portion 36 have higher rigidity than the wavy portion 32, the wavy portion during expansion and contraction of the first battery cell 20a and / or the second battery 20b. 32 is mainly deformed, and the first and second ribs 33 and 34 and the battery holding portion 36 are not deformed or are negligible even if deformed.

本発明実施例の比較例を示す図８（ｂ１）、（ｂ２）に示すように、樹脂枠３０に電池押さえ部３６が設けられていない場合、電池セル２０が膨張すると（図中膨張セルを符号２０−１で示す）、膨張セル２０−１によりその両側にある樹脂枠３０−１が押されその外側にある隣接セル２０−２がセル積層方向Ｄ１に押されて位置ズレするおそれがある。しかし、本発明実施例を示す図８（ａ１），（ａ２）に示すように、樹脂枠３０に電池押さえ部３６が設けられていると、膨張セル２０−１の膨張がその両側にある樹脂枠３０−１の波状部３２で吸収されるだけであり、膨張セル２０−１及びその両側にある隣接セル２０−２のセル積層方向Ｄ１の位置が変わることを抑制できる。 As shown in FIGS. 8 (b1) and 8 (b2) showing comparative examples of the examples of the present invention, when the battery holding portion 36 is not provided in the resin frame 30, when the battery cell 20 expands (the expansion cell in the figure is expanded). (Indicated by reference numeral 20-1), the expansion cell 20-1 may push the resin frames 30-1 on both sides thereof, and the adjacent cells 20-2 on the outer side thereof may be pushed in the cell stacking direction D1 to cause misalignment. .. However, as shown in FIGS. 8A1 and 8A2 showing examples of the present invention, when the battery holding portion 36 is provided in the resin frame 30, the expansion of the expansion cell 20-1 is formed on both sides of the resin. It is only absorbed by the wavy portion 32 of the frame 30-1, and it is possible to suppress the change in the position of the expansion cell 20-1 and the adjacent cells 20-2 on both sides of the expansion cell 20-2 in the cell stacking direction D1.

図９に示すように、樹脂枠３０が第１、第２電池セル２０ａ、２０ｂに挟まれておらず自由状態にあるとき、すなわち、波状部３２が曲げ弾性変形しておらず自由状態にあるとき、電池押さえ部３６が波状部３２よりも高く設定されており（図９におけるＨ１）、第１、第２リブ３３，３４が電池押さえ部３６よりも高く設定されている（図９におけるＨ２）。すなわち、樹脂枠３０（波状部３２）が自由状態にあるとき、樹脂枠３０の面直方向（セル積層方向Ｄ１、図９における左右方向）への突出量は、波状部３２よりも電池押さえ部３６が大となっており、電池押さえ部３６よりも第１、第２リブ３３，３４が大となっている。 As shown in FIG. 9, when the resin frame 30 is not sandwiched between the first and second battery cells 20a and 20b and is in a free state, that is, the wavy portion 32 is not bent and elastically deformed and is in a free state. When, the battery holding portion 36 is set higher than the wavy portion 32 (H1 in FIG. 9), and the first and second ribs 33 and 34 are set higher than the battery holding portion 36 (H2 in FIG. 9). ). That is, when the resin frame 30 (wavy portion 32) is in a free state, the amount of protrusion of the resin frame 30 in the direction perpendicular to the plane (cell stacking direction D1, left-right direction in FIG. 9) is larger than that of the wavy portion 32. 36 is large, and the first and second ribs 33 and 34 are larger than the battery holding portion 36.

一方、図３に示すように、樹脂枠３０が第１、第２電池セル２０ａ、２０ｂに挟まれているとき、波状部３２は曲げ弾性変形しており、第１、第２リブ３３，３４と電池押さえ部３６は、ともに同じ高さにあり第１、第２電池セル２０ａ、２０ｂに当接している。 On the other hand, as shown in FIG. 3, when the resin frame 30 is sandwiched between the first and second battery cells 20a and 20b, the wavy portion 32 is elastically deformed by bending, and the first and second ribs 33 and 34 And the battery holding portion 36 are both at the same height and are in contact with the first and second battery cells 20a and 20b.

つぎに、本発明実施例の作用、効果を説明する。
（Ａ）第１電池セル２０ａに向けた第１凸部３２ａと第２電池セル２０ｂに向けた第２凸部３２ｂがセル積層直交方向Ｄ２に交互に繰り返す波状部３２が設けられているため、波状部３２が曲げ弾性変形することによる弾性力（復元力）により、樹脂枠３０から第１、第２電池セル２０ａ、２０ｂにセル積層方向Ｄ１に荷重（拘束荷重）を付与することができる。また、第１電池セル２０ａおよび／または第２電池セル２０ｂの膨張時には、波状部３２がさらに曲げ弾性変形することで、第１電池セル２０ａおよび／または第２の電池２０ｂの膨張を吸収できる。ここで、一般的に曲げ変形に要する荷重は圧縮変形に要する荷重よりも小さい。そのため、第１電池セル２０ａおよび／または第２電池セル２０ｂが膨張しても樹脂枠３０から第１電池セル２０ａおよび第２電池セル２０ｂにかかる荷重の増加を抑制できる。 Next, the actions and effects of the examples of the present invention will be described.
(A) Since the first convex portion 32a facing the first battery cell 20a and the second convex portion 32b facing the second battery cell 20b are provided with a wavy portion 32 that alternately repeats in the cell stacking orthogonal direction D2. A load (restraint load) can be applied from the resin frame 30 to the first and second battery cells 20a and 20b in the cell stacking direction D1 by the elastic force (restoring force) caused by the bending elastic deformation of the wavy portion 32. Further, when the first battery cell 20a and / or the second battery cell 20b expands, the wavy portion 32 further bends and elastically deforms, so that the expansion of the first battery cell 20a and / or the second battery 20b can be absorbed. Here, the load required for bending deformation is generally smaller than the load required for compressive deformation. Therefore, even if the first battery cell 20a and / or the second battery cell 20b expands, it is possible to suppress an increase in the load applied from the resin frame 30 to the first battery cell 20a and the second battery cell 20b.

（Ｂ）第１リブ３３と第２リブ３４がセル積層直交方向Ｄ２に交互に設定されているため、樹脂枠３０から第１電池セル２０ａと第２電池セル２０ｂの両方にかかる荷重を等しく（ほぼ等しくを含む）することができる。さらに、第１リブ３３と第２リブ３４との間に介在されるリブ無し凸部３２ｃの数が、隣り合うそれぞれの第１リブ３３と第２リブ３４の間で同数であるため、隣り合うそれぞれの第１リブ３３と第２のリブ３４との間の距離（リブ間ピッチＰ）を等ピッチ（ほぼ等ピッチを含む）にすることができる。よって、樹脂枠３０と第１、第２電池セル２０ａ、２０ｂとの接触部がセル積層直交方向Ｄ２で等ピッチになり、樹脂枠３０から第１、第２電池セル２０ａ、２０ｂへの面圧バラつきが生じることを抑制できる。 (B) Since the first rib 33 and the second rib 34 are alternately set in the cell stacking orthogonal direction D2, the loads applied to both the first battery cell 20a and the second battery cell 20b from the resin frame 30 are equal (). Includes approximately equal). Further, since the number of ribless convex portions 32c interposed between the first rib 33 and the second rib 34 is the same between the adjacent first rib 33 and the second rib 34, they are adjacent to each other. The distance between each of the first ribs 33 and the second ribs 34 (inter-rib pitch P) can be made equal pitch (including substantially equal pitch). Therefore, the contact portions between the resin frame 30 and the first and second battery cells 20a and 20b have equal pitches in the cell stacking orthogonal direction D2, and the surface pressure from the resin frame 30 to the first and second battery cells 20a and 20b becomes equal. It is possible to suppress the occurrence of variation.

（Ｃ）図７の（ａ）、（ｂ）に示すように、第１、第２リブ３３，３４の間にリブ無し凸部３２ｃが偶数個存在しているため、第１電池セル２０ａおよび／または第２電池セル２０ｂの膨張を、リブ無し凸部３２ｃの各曲率（曲げ形状）が変わることで、第１リブ３３と第２リブ３４とのリブ間ピッチＰをほとんど変えることなく吸収できる。よって、リブ間ピッチＰが変わり樹脂枠３０自体のセル積層直交方向Ｄ２の全長が変わってしまうことを抑制できる。 (C) As shown in FIGS. 7A and 7B, since an even number of ribless convex portions 32c exist between the first and second ribs 33 and 34, the first battery cell 20a and / Or the expansion of the second battery cell 20b can be absorbed with almost no change in the inter-rib pitch P between the first rib 33 and the second rib 34 by changing each curvature (bending shape) of the ribless convex portion 32c. .. Therefore, it is possible to prevent the pitch P between the ribs from changing and the total length of the resin frame 30 itself in the cell stacking orthogonal direction D2 from changing.

（Ｄ）第１リブ３３と第２リブ３４の剛性が、波状部３２の剛性に比べて大とされているため、波状部３２ではなく第１、第２リブ３３，３４が変形してしまうことを抑制できる。その結果、波状部３２による曲げ弾性変形力で第１、第２電池セル２０ａ、２０ｂを拘束でき、所定の拘束荷重で精度よく第１、第２電池セル２０ａ、２０ｂを拘束できる。 (D) Since the rigidity of the first rib 33 and the second rib 34 is larger than the rigidity of the wavy portion 32, the first and second ribs 33 and 34 are deformed instead of the wavy portion 32. Can be suppressed. As a result, the first and second battery cells 20a and 20b can be restrained by the bending elastic deformation force of the wavy portion 32, and the first and second battery cells 20a and 20b can be accurately restrained by a predetermined restraining load.

（Ｅ）角型の電池セルにあっては、電池セルの膨張率は、セル積層方向から見たときの電池セルの中央部が最も大きく、電池セルの外周部にいくにしたがって小さくなり、電池セルの外周部でゼロまたはほぼゼロである。ここで本発明実施例では、樹脂枠３０が第１、第２電池セル２０ａ、２０ｂのそれぞれの外周部２０ａ１，２０ｂ１に当接する電池押さえ部３６を有している。そのため、第１、第２電池セルの膨張時であっても、第１、第２電池セル２０ａ、２０ｂの外周部２０ａ１，２０ｂ１と電池押さえ部３６は膨張の影響が無いかあっても無視できる程度であり、第１、第２電池セル２０ａ、２０ｂの外周部２０ａ１，２０ｂ１と電池押さえ部３６のセル積層方向Ｄ１の位置がズレることが抑制される。よって、第１電池セル２０ａおよび／または第２電池セル２０ｂの膨張時に第１、第２電池セル２０ａ、２０ｂのそれぞれの端子２３，２４位置がセル積層方向Ｄ１にズレることを抑制できる。 (E) In a square battery cell, the expansion coefficient of the battery cell is the largest at the center of the battery cell when viewed from the cell stacking direction, and decreases toward the outer periphery of the battery cell, and the battery Zero or near zero at the outer periphery of the cell. Here, in the embodiment of the present invention, the resin frame 30 has a battery holding portion 36 that abuts on the outer peripheral portions 20a1 and 20b1 of the first and second battery cells 20a and 20b, respectively. Therefore, even when the first and second battery cells are expanded, the outer peripheral portions 20a1, 20b1 and the battery holding portion 36 of the first and second battery cells 20a and 20b can be ignored even if they are not affected by the expansion. The positions of the outer peripheral portions 20a1 and 20b1 of the first and second battery cells 20a and 20b and the cell stacking direction D1 of the battery holding portion 36 are suppressed. Therefore, it is possible to prevent the terminals 23 and 24 of the first and second battery cells 20a and 20b from being displaced in the cell stacking direction D1 when the first battery cell 20a and / or the second battery cell 20b is expanded.

（Ｆ）樹脂枠３０が第１、第２電池セル２０ａ、２０ｂに挟まれていないとき、第１、第２リブ３３，３４は電池押さえ部３６よりも高く設定されており、樹脂枠３０が第１、第２電池セル２０ａ、２０ｂに挟まれているとき、第１、第２リブ３３，３４と電池押さえ部３６はともに第１、第２電池セル２０ａ、２０ｂに当接しているため、樹脂枠３０が第１、第２電池セル２０ａ、２０ｂに挟まれたときに、第１、第２凸部３２ａ、３２ｂを確実に曲げ弾性変形させることができ、この弾性変形による拘束荷重を第１、第２電池セル２０ａ、２０ｂに付与することができる。 (F) When the resin frame 30 is not sandwiched between the first and second battery cells 20a and 20b, the first and second ribs 33 and 34 are set higher than the battery holding portion 36, and the resin frame 30 is set higher than the battery holding portion 36. When sandwiched between the first and second battery cells 20a and 20b, the first and second ribs 33 and 34 and the battery holding portion 36 are both in contact with the first and second battery cells 20a and 20b. When the resin frame 30 is sandwiched between the first and second battery cells 20a and 20b, the first and second convex portions 32a and 32b can be reliably bent and elastically deformed, and the restraining load due to this elastic deformation is applied to the first. It can be applied to the first and second battery cells 20a and 20b.

本発明実施例では、樹脂枠３０がポリプロピレン樹脂製である場合を説明したが、波状部３２のみ、または波状部３２と第１、第２リブ３３，３４は、エラストマや天然ゴム、シリコーンゴム等の、弾性限度が高く、弾性率の低い素材で構成されていてはもよい。なお、これら低弾性率の材料を使用する際、樹脂枠３０は、波状部３２と第１、第２リブ３３，３４のみ低弾性率の材料にし、連結部３５、電池押さえ部３６および外枠部３１をより高弾性率の材料とする２色成形で作製されていてもよい。 In the embodiment of the present invention, the case where the resin frame 30 is made of polypropylene resin has been described, but only the wavy portion 32, or the wavy portion 32 and the first and second ribs 33 and 34 are made of elastic rubber, natural rubber, silicone rubber or the like. It may be made of a material having a high elastic limit and a low elastic modulus. When these materials having a low elastic modulus are used, the resin frame 30 is made of a material having a low elastic modulus only in the wavy portion 32 and the first and second ribs 33 and 34, and the connecting portion 35, the battery holding portion 36 and the outer frame are used. It may be manufactured by two-color molding using the portion 31 as a material having a higher elastic modulus.

１０組電池
２０電池セル
２０ａ第１電池セル
２０ａ１第１電池セルの外周部
２０ｂ第２電池セル
２０ｂ１第２電池セルの外周部
２１セルケース
２１ａ下底部
２２蓋部
２３，２４端子
３０樹脂枠
３１外枠部
３２波状部
３２ａ第１凸部
３２ｂ第２凸部
３２ｃリブ無し凸部
３３第１リブ
３４第２リブ
３５連結部
３６電池押さえ部
４０エンドプレート
Ｄ１セル積層方向
Ｄ２セル積層直交方向 10 battery 20 battery cell 20a 1st battery cell 20a1 1st battery cell outer circumference 20b 2nd battery cell 20b1 2nd battery cell outer circumference 21 cell case 21a lower bottom 22 lid 23, 24 terminals 30 resin frame 31 outside Frame 32 Wavy 32a 1st convex 32b 2nd convex 32c No rib Convex 33 1st rib 34 2nd rib 35 Connecting 36 Battery holding 40 End plate D1 Cell stacking direction D2 Cell stacking orthogonal direction

Claims

It has a resin frame sandwiched between the first battery cell and the second battery cell arranged in the cell stacking direction.
The resin frame is
A wavy portion in which the first convex portion toward the first battery cell and the second convex portion toward the second battery cell alternately repeat in the direction orthogonal to the cell stacking.
A first rib that projects from a part of the plurality of first convex portions toward the first battery cell and abuts on the first battery cell at the tip portion in the projecting direction.
A second rib that projects from a part of the plurality of second convex portions toward the second battery cell and abuts on the second battery cell at the tip portion in the projecting direction.
Have and
The first rib and the second rib are alternately set in the cell stacking orthogonal direction by interposing an even number of ribless convex portions on which the first and second ribs are not provided.
An assembled battery in which the number of ribless protrusions is the same between the adjacent first ribs and the second ribs.

The assembled battery according to claim 1, wherein the rigidity of the first rib and the second rib is larger than the rigidity of the wavy portion.

The first battery cell and the second battery cell are square battery cells, and the first battery cell and the second battery cell are square battery cells.
The resin frame has a battery holding portion that is located between the first battery cell and the second battery cell and is in contact with the outer peripheral portion of the first battery cell and the outer peripheral portion of the second battery cell. The assembled battery according to claim 1 or 2, wherein the rigidity of the battery holding portion is larger than the rigidity of the wavy portion.

When the resin frame is not sandwiched between the first and second battery cells, the first and second ribs are set higher than the battery holding portion, and the resin frame is set to the first and second batteries. The assembled battery according to claim 3, wherein both the first and second ribs and the battery holding portion are in contact with the first and second battery cells when sandwiched between the cells.