JP6794709B2

JP6794709B2 - Battery module

Info

Publication number: JP6794709B2
Application number: JP2016156826A
Authority: JP
Inventors: 浩生植田; 拓井上; 泰有秋山
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2016-08-09
Filing date: 2016-08-09
Publication date: 2020-12-02
Anticipated expiration: 2036-08-09
Also published as: JP2018026244A

Description

本発明は、電池モジュールに関する。 The present invention relates to a battery module.

特許文献１には、複数の角型電池セルを一体的に積層してなる組電池（電池モジュール）が記載されている。この組電池においては、積層された角型電池セルのうちの端部に位置する角型電池セルに対して、金属製の拘束プレートが突き当てられている。それらの一対の拘束プレートは、角型電池セルが押圧されるように、長手状の連結部材によって相互に連結されている。 Patent Document 1 describes an assembled battery (battery module) in which a plurality of square battery cells are integrally laminated. In this assembled battery, a metal restraint plate is abutted against the square battery cell located at the end of the stacked square battery cells. The pair of restraint plates are connected to each other by a longitudinal connecting member so that the square battery cell is pressed.

特開２００１−２３６９３７号公報Japanese Unexamined Patent Publication No. 2001-236937

上述した電池モジュールを電池パックの筐体に固定する際には、例えば、電池セルの積層方向における電池モジュールの両端に所定の固定部材を設置し、電池モジュールの両端側において電池モジュールを筐体に固定することが想定される。この場合には、電池モジュールに対して振動や衝撃が加わると、電池セルの積層体が、その積層方向に交差する方向に撓むおそれがある。また、電池セルの劣化等に起因した電池セルの膨張も、積層体の撓みの原因になる場合がある。 When fixing the above-mentioned battery module to the housing of the battery pack, for example, predetermined fixing members are installed at both ends of the battery module in the stacking direction of the battery cells, and the battery modules are attached to the housing on both ends of the battery module. It is expected to be fixed. In this case, when vibration or impact is applied to the battery module, the stack of battery cells may bend in a direction intersecting the stacking direction. In addition, expansion of the battery cell due to deterioration of the battery cell or the like may also cause bending of the laminated body.

本発明は、電池セルの積層体の撓みを抑制可能な電池モジュールを提供することを目的とする。 An object of the present invention is to provide a battery module capable of suppressing bending of a laminated body of battery cells.

本発明に係る電池モジュールは、第１方向に沿って互いに積層された複数の電池セルを含む積層体と、第１方向に沿って積層体に拘束荷重を負荷すると共に、第１方向における積層体の両端側において積層体を被固定部材に対して固定するための一対の拘束固定機構と、一対の拘束固定機構の間に配置され、積層体を被固定部材に固定する固定部材と、を備え、拘束固定機構は、電池セルが拘束荷重に抗しつつ第１方向に沿ってスライド可能なように、積層体を被固定部材に固定する。 The battery module according to the present invention is a laminated body including a plurality of battery cells stacked on each other along the first direction, and a laminated body in the first direction while applying a restraining load to the laminated body along the first direction. A pair of restraint fixing mechanisms for fixing the laminated body to the fixed member on both end sides of the above, and a fixing member arranged between the pair of restraint fixing mechanisms for fixing the laminated body to the fixed member. The restraint fixing mechanism fixes the laminated body to the fixed member so that the battery cell can slide along the first direction while resisting the restraint load.

この電池モジュールにおいては、拘束固定機構が、第１方向（積層方向）に沿って互いに積層された複数の電池セルを含む積層体に対して拘束荷重を加えると共に、電池セルが拘束荷重に抗しながら積層方向に沿ってスライド可能なように、積層体の両端側において積層体を被固定部材に固定している。したがって、電池セルが膨張した場合に電池セルのスライドが許容されるので、電池セルの膨張に起因した積層体の撓みが抑制される。さらに、この電池モジュールにあっては、拘束固定機構の間において、固定部材が積層体を被固定部材に固定している。したがって、電池モジュールに振動や衝撃が加わった際の積層体の撓みが抑制される。なお、被固定部材の一例としては、複数の電池モジュールを備える電池パックの筐体等が挙げられる。 In this battery module, the restraint fixing mechanism applies a restraint load to a laminate including a plurality of battery cells laminated with each other along the first direction (stacking direction), and the battery cells resist the restraint load. However, the laminated body is fixed to the fixed member on both end sides of the laminated body so that it can slide along the stacking direction. Therefore, since the battery cell is allowed to slide when the battery cell expands, the bending of the laminated body due to the expansion of the battery cell is suppressed. Further, in this battery module, a fixing member fixes the laminated body to the fixed member between the restraint fixing mechanisms. Therefore, the bending of the laminated body when vibration or impact is applied to the battery module is suppressed. An example of the fixed member is a housing of a battery pack including a plurality of battery modules.

本発明に係る電池モジュールにおいては、固定部材は、第１方向に沿って電池セルと共に配列された板状部と、板状部と一体に形成され、被固定部材に固定されることによって積層体を被固定部材に固定する第１固定部と、を含むでもよい。このように、積層体の固定に際して、板状の部分（板状部）を有する固定部材を用いることができる。 In the battery module according to the present invention, the fixing member is formed integrally with the plate-shaped portion arranged together with the battery cell along the first direction and the plate-shaped portion, and is fixed to the fixed member to form a laminated body. May include a first fixing portion for fixing the device to the member to be fixed. As described above, when fixing the laminated body, a fixing member having a plate-shaped portion (plate-shaped portion) can be used.

本発明に係る電池モジュールにおいては、第１固定部には、第１貫通孔が設けられており、第１固定部は、第１貫通孔に挿通されるボルトによって被固定部材に固定され、第１貫通孔は、第１方向に沿って延びる長穴であってもよい。この場合、固定部材の固定に用いられる第１貫通孔（ボルト穴）が積層方向に沿って延びる長穴であるので、ボルトに対する第１貫通孔の相対的な位置の変化によって固定部材のスライドが許容される。すなわち、電池セルが膨張した場合に、固定部材がスライドすることによって、電池セルのスライドが阻害されない。このため、電池セルの膨張に起因した積層体の撓みを確実に抑制可能である。 In the battery module according to the present invention, the first fixing portion is provided with a first through hole, and the first fixing portion is fixed to the fixed member by a bolt inserted through the first through hole. The 1 through hole may be an elongated hole extending along the first direction. In this case, since the first through hole (bolt hole) used for fixing the fixing member is an elongated hole extending along the stacking direction, the fixing member slides due to a change in the relative position of the first through hole with respect to the bolt. Permissible. That is, when the battery cell expands, the fixing member slides, so that the sliding of the battery cell is not hindered. Therefore, the bending of the laminated body due to the expansion of the battery cell can be reliably suppressed.

本発明に係る電池モジュールにおいては、拘束固定機構は、それぞれ、第１方向に沿って電池セルと共に配列され積層体に拘束荷重を負荷する拘束部と、被固定部材に固定されることによって積層体を被固定部材に固定する第２固定部と、を有してもよい。 In the battery module according to the present invention, the restraint fixing mechanism is arranged together with the battery cells along the first direction and applies a restraint load to the laminate, and the restraint fixing mechanism is fixed to the laminate to be fixed. May have a second fixing portion for fixing the member to the fixed member.

本発明に係る電池モジュールにおいては、拘束固定機構のうちの少なくとも１つは、拘束部と積層体との間に配置された弾性部材を含み、拘束固定機構は、弾性部材の第１方向に沿った変形によって、電池セルのスライドを許容してもよい。このように、弾性部材の変形によって電池セルをスライド可能とすれば、電池セルの膨張に起因した積層体の撓みを確実に抑制可能である。一方、この場合には、例えば電池セルの膨張時や電池モジュールに振動・衝撃が加えられたときに、弾性部材が剪断変形することによって、積層体における弾性部材側の部分が撓みやすくなる。このため、固定部材によって撓みを抑制することがより有効である。 In the battery module according to the present invention, at least one of the restraint fixing mechanisms includes an elastic member arranged between the restraint portion and the laminated body, and the restraint fixing mechanism is along the first direction of the elastic member. The deformation may allow the battery cell to slide. As described above, if the battery cell can be slid by the deformation of the elastic member, the bending of the laminated body due to the expansion of the battery cell can be reliably suppressed. On the other hand, in this case, for example, when the battery cell is expanded or when vibration or shock is applied to the battery module, the elastic member is sheared and deformed, so that the portion of the laminated body on the elastic member side tends to bend. Therefore, it is more effective to suppress the bending by the fixing member.

本発明に係る電池モジュールにおいては、拘束固定機構は、それぞれ、弾性部材を含んでもよい。この場合、積層体の両端側に弾性部材が配置されることになる。したがって、電池セルの膨張に起因した積層体の撓みをより確実に抑制可能である。また、固定部材によって撓みを抑制することの有効性がさらに高い。さらに、この場合には、電池セルのスライドが、積層体の両端側の弾性部材によって許容されるので（すなわち両側に分散されるので）、それぞれの電池セルのスライド量を低減することが可能である。 In the battery module according to the present invention, each of the restraint fixing mechanisms may include an elastic member. In this case, elastic members are arranged on both ends of the laminated body. Therefore, the bending of the laminated body due to the expansion of the battery cell can be more reliably suppressed. Further, it is more effective to suppress the bending by the fixing member. Further, in this case, since the sliding of the battery cells is allowed by the elastic members on both ends of the laminate (that is, they are dispersed on both sides), it is possible to reduce the sliding amount of each battery cell. is there.

本発明に係る電池モジュールにおいては、固定部材は、板状部が積層体と弾性部材との間に介在するように配置されていてもよい。この場合、積層体における弾性部材側の部分の撓みを効果的に抑制可能である。 In the battery module according to the present invention, the fixing member may be arranged so that the plate-shaped portion is interposed between the laminated body and the elastic member. In this case, the bending of the elastic member side portion of the laminated body can be effectively suppressed.

本発明に係る電池モジュールにおいては、固定部材は、板状部が電池セルの間に介在するように配置されていてもよい。例えば、弾性部材の剛性が大きく剪断変形しにくく、且つ、積層体の全体の剛性が低く撓みやすい場合には、このように固定部材を弾性部材から離して電池セル間に配置することによって、積層体の撓みを効果的に抑制可能である。 In the battery module according to the present invention, the fixing member may be arranged so that a plate-shaped portion is interposed between the battery cells. For example, when the rigidity of the elastic member is large and it is difficult to be sheared and deformed, and the rigidity of the entire laminated body is low and it is easy to bend, the fixing member is arranged between the battery cells separately from the elastic member in this way. It is possible to effectively suppress the bending of the body.

本発明に係る電池モジュールにおいては、第２固定部には、第２貫通孔が設けられており、第２固定部は、第２貫通孔に挿通されるボルトによって被固定部材に固定され、第２貫通孔は、第１方向に沿って延びる長穴であり、拘束固定機構は、ボルトに対する第２貫通孔の第１方向に沿った相対的な位置の変化によって、電池セルのスライドを許容すしてもよい。この場合、拘束固定機構の第２固定部を利用して、電池セルをスライド可能とすることができる。つまり、弾性部材を用いることなく、電池セルの膨張に起因した積層体の撓みを抑制可能である。ただし、弾性部材を併せて利用することにより、電池セルのスライドを確実に許容可能としてもよい。 In the battery module according to the present invention, the second fixing portion is provided with a second through hole, and the second fixing portion is fixed to the fixed member by a bolt inserted through the second through hole. The two through holes are elongated holes extending along the first direction, and the restraint fixing mechanism allows the battery cell to slide due to a change in the relative position of the second through hole with respect to the bolt along the first direction. You may. In this case, the battery cell can be made slidable by using the second fixing portion of the restraint fixing mechanism. That is, it is possible to suppress the bending of the laminated body due to the expansion of the battery cell without using an elastic member. However, the sliding of the battery cell may be reliably allowed by using the elastic member together.

本発明に係る電池モジュールにおいては、積層体は、複数の電池セルの一部を含む第１部分と、複数の電池セルの残部を含む第２部分と、を有し、固定部材は、第１部分と第２部分との間に配置されており、拘束固定機構は、拘束部のそれぞれを固定部材に締結することにより、一方の拘束部と固定部材とによって第１部分に拘束荷重を負荷すると共に、他方の拘束部と固定部材とによって第２部分に拘束荷重を負荷してもよい。このように、積層体の第１部分と第２部分との間に配置された固定部材を用いて、拘束部の締結を行えば、積層体の両端の拘束部同士を締結する場合と比較して、締結のためのボルトを短くできる。これにより、コストを低減できる。 In the battery module according to the present invention, the laminate has a first portion including a part of a plurality of battery cells and a second portion including the rest of the plurality of battery cells, and the fixing member is a first portion. Arranged between the portion and the second portion, the restraint fixing mechanism applies a restraint load to the first portion by one of the restraint portions and the fixing member by fastening each of the restraint portions to the fixing member. At the same time, a restraining load may be applied to the second portion by the other restraining portion and the fixing member. In this way, if the restraining portions are fastened using the fixing members arranged between the first portion and the second portion of the laminated body, compared with the case where the restraining portions at both ends of the laminated body are fastened to each other. Therefore, the bolt for fastening can be shortened. As a result, the cost can be reduced.

本発明に係る電池モジュールにおいては、２つ以上の固定部材を備え、固定部材同士の間には、電池セルが介在していてもよい。このように、２つ以上の固定部材を用いれば、積層体の撓みをより確実に抑制可能である。 The battery module according to the present invention may include two or more fixing members, and a battery cell may be interposed between the fixing members. As described above, if two or more fixing members are used, the bending of the laminated body can be suppressed more reliably.

本発明によれば、電池セルの積層体の撓みを抑制可能な電池モジュールを提供することができる。 According to the present invention, it is possible to provide a battery module capable of suppressing bending of a laminated body of battery cells.

本実施形態に係る電池モジュールを示す図である。It is a figure which shows the battery module which concerns on this embodiment. 図１に示された電池ユニットを示す分解斜視図である。It is an exploded perspective view which shows the battery unit shown in FIG. 図１に示された電池モジュールの一部を示す図である。It is a figure which shows a part of the battery module shown in FIG. 本実施形態に係る電池モジュールを示す図である。It is a figure which shows the battery module which concerns on this embodiment. 本実施形態に係る電池モジュールを示す図である。It is a figure which shows the battery module which concerns on this embodiment. 本実施形態に係る電池モジュールを示す図である。It is a figure which shows the battery module which concerns on this embodiment. 本実施形態に係る電池モジュールを示す図である。It is a figure which shows the battery module which concerns on this embodiment.

以下、図面参照して電池モジュールの一実施形態について説明する。なお、図面の説明において、同一の要素同士、又は、相当する要素同士には互いに同一の符号を付し、重複する説明を省略する場合がある。また、各図面には、Ｘ軸、Ｙ軸、及びＺ軸からなる直交座標系Ｓを示す場合がある。
［第１実施形態］ Hereinafter, an embodiment of the battery module will be described with reference to the drawings. In the description of the drawings, the same elements or the corresponding elements may be designated by the same reference numerals, and duplicate description may be omitted. Further, each drawing may show a Cartesian coordinate system S including an X-axis, a Y-axis, and a Z-axis.
[First Embodiment]

図１は、本実施形態に係る電池モジュールを示す図である。図１の（ａ）は電池モジュールの模式的な側面図であり、図１の（ｂ）は撓みに関する特性を示すグラフである。図１に示されるように、電池モジュール１は、例えば、電池パックの筐体等の被固定部材Ｍに固定されている。電池モジュール１は、積層体１０と、一対の拘束固定機構２０と、締結部材３０と、固定部材４０と、を備えている。積層体１０は、第１方向（ここではＸ軸方向）に沿って互いに積層された複数（例えば１０個）の電池ユニット１１を含む。 FIG. 1 is a diagram showing a battery module according to the present embodiment. FIG. 1A is a schematic side view of the battery module, and FIG. 1B is a graph showing characteristics related to bending. As shown in FIG. 1, the battery module 1 is fixed to a fixed member M such as a housing of a battery pack, for example. The battery module 1 includes a laminate 10, a pair of restraint fixing mechanisms 20, a fastening member 30, and a fixing member 40. The laminated body 10 includes a plurality of (for example, 10) battery units 11 laminated with each other along the first direction (here, the X-axis direction).

図２は、図１に示された電池ユニットを示す分解斜視図である。図２に示されるように、電池ユニット１１は、それぞれ、電池セル１２と、セルホルダ１３と、伝熱プレート１４と、を含む。したがって、積層体１０は、第１方向に沿って互いに積層された複数（例えば１０個）の電池セル１２を含む。電池セル１２は、例えば、リチウムイン二次電池等の非水電解質二次電池である。 FIG. 2 is an exploded perspective view showing the battery unit shown in FIG. As shown in FIG. 2, the battery unit 11 includes a battery cell 12, a cell holder 13, and a heat transfer plate 14, respectively. Therefore, the laminated body 10 includes a plurality of (for example, 10) battery cells 12 laminated with each other along the first direction. The battery cell 12 is a non-aqueous electrolyte secondary battery such as a lithium-in secondary battery.

電池セル１２は、電極組立体１５と、電極組立体１５を収容する直方体状のケース１６と、電極組立体１５の電極（正極及び負極のそれぞれ）に電気的に接続された一対の端子１７と、を含む。電極組立体１５は、複数の正極（不図示）及び負極（不図示）と、正極と負極との間に配置されたセパレータ（不図示）と、を含む。正極及び負極は、第１方向に沿って、セパレータを介して交互に積層されている。ケース１６は、第１方向（電池セル１２の積層方向）に沿った一対の側面１６ａと、第１方向に交差する方向（ここではＹ軸方向及びＺ軸方向）に沿って延び、側面１６ａ同士を接続する一対の側面１６ｂと、を含む。 The battery cell 12 includes an electrode assembly 15, a rectangular case 16 that houses the electrode assembly 15, and a pair of terminals 17 that are electrically connected to the electrodes (positive electrode and negative electrode, respectively) of the electrode assembly 15. ,including. The electrode assembly 15 includes a plurality of positive electrodes (not shown) and negative electrodes (not shown), and a separator (not shown) arranged between the positive electrode and the negative electrode. The positive electrode and the negative electrode are alternately laminated along the first direction with the separator interposed therebetween. The case 16 extends along a pair of side surfaces 16a along the first direction (the stacking direction of the battery cells 12) and directions intersecting the first direction (here, the Y-axis direction and the Z-axis direction), and the side surfaces 16a extend from each other. Includes a pair of side surfaces 16b, which connect the two.

セルホルダ１３は、電池セル１２を保持する。より具体的には、セルホルダ１３は、互いに対向する一対の側壁部１３ａと、背面部１３ｂ及び底壁部１３ｃと、を含む。側壁部１３ａは、長方形板状を呈している。背面部１３ｂは、長方形板状を呈しており、側壁部１３ａの長手方向の一端部において側壁部１３ａ同士を互いに接続している。底壁部１３ｃは、長方形板状を呈しており、側壁部１３ａの長手方向の他端部において側壁部１３ａ同士を互いに接続している。 The cell holder 13 holds the battery cell 12. More specifically, the cell holder 13 includes a pair of side wall portions 13a facing each other, a back surface portion 13b, and a bottom wall portion 13c. The side wall portion 13a has a rectangular plate shape. The back surface portion 13b has a rectangular plate shape, and the side wall portions 13a are connected to each other at one end of the side wall portion 13a in the longitudinal direction. The bottom wall portion 13c has a rectangular plate shape, and the side wall portions 13a are connected to each other at the other end of the side wall portion 13a in the longitudinal direction.

セルホルダ１３においては、側壁部１３ａと背面部１３ｂ及び底壁部１３ｃとによって、電池セル１２が嵌め合される直方体状の空間部が画成されている。側壁部１３ａは、それぞれ、当該空間部に電池セル１２が嵌め合されたときに、ケース１６の側面１６ａ上に配置される。同様に、背面部１３ｂは、ケース１６の側面１６ｂ上に配置される。 In the cell holder 13, a rectangular parallelepiped space portion into which the battery cell 12 is fitted is defined by the side wall portion 13a, the back surface portion 13b, and the bottom wall portion 13c. Each of the side wall portions 13a is arranged on the side surface 16a of the case 16 when the battery cell 12 is fitted into the space portion. Similarly, the back surface portion 13b is arranged on the side surface 16b of the case 16.

背面部１３ｂには、一対の突設部１３ｐが設けられている。また、底壁部１３ｃにおける側壁部１３ａとの接続部分にも、一対の突設部１３ｐが設けられている。突設部１３ｐは、直方体状を呈している。突設部１３ｐには、第１方向に沿った挿通孔１３ｈが形成されている。この挿通孔１３ｈには、後述するように、締結部材３０のボルト３１が挿通される。 The back surface portion 13b is provided with a pair of projecting portions 13p. Further, a pair of projecting portions 13p are also provided at the connecting portion of the bottom wall portion 13c with the side wall portion 13a. The projecting portion 13p has a rectangular parallelepiped shape. An insertion hole 13h along the first direction is formed in the projecting portion 13p. As will be described later, the bolt 31 of the fastening member 30 is inserted into the insertion hole 13h.

伝熱プレート１４は、矩形板状の本体部１４ａと、矩形板状の延在部１４ｂと、を含む。伝熱プレート１４は、本体部１４ａと延在部１４ｂとによってＬ字板状に形成されている。本体部１４ａは、電池セル１２（ケース１６）の側面１６ｂ上に配置される。延在部１４ｂは、本体部１４ａから第１方向に沿って延び、電池セル１２（ケース１６）の側面１６ａ上に配置される。特に、延在部１４ｂは、セルホルダ１３の側壁部１３ａを介して側面１６ａ上に配置される。 The heat transfer plate 14 includes a rectangular plate-shaped main body portion 14a and a rectangular plate-shaped extending portion 14b. The heat transfer plate 14 is formed in an L-shape by the main body portion 14a and the extending portion 14b. The main body 14a is arranged on the side surface 16b of the battery cell 12 (case 16). The extending portion 14b extends from the main body portion 14a along the first direction and is arranged on the side surface 16a of the battery cell 12 (case 16). In particular, the extending portion 14b is arranged on the side surface 16a via the side wall portion 13a of the cell holder 13.

伝熱プレート１４は、本体部１４ａにおいて電池セル１２に接触すると共に、延在部１４ｂにおける側壁部１３ａと反対側の面において、被固定部材Ｍに接触する（直接的な接触に限らず、所定の熱伝導部材を介して接触する場合もある）。これにより、伝熱プレート１４は、電池セル１２と被固定部材Ｍとを熱的に接続する。特に、延在部１４ｂにおける側壁部１３ａと反対側の面は、電池セル１２を被固定部材Ｍに熱的に接続する伝熱面１４ｓである。すなわち、電池ユニット１１は、伝熱面１４ｓが被固定部材Ｍに対向するように配置される。 The heat transfer plate 14 contacts the battery cell 12 at the main body 14a and also contacts the fixed member M on the surface of the extending portion 14b opposite to the side wall 13a (not limited to direct contact, but is predetermined). May come into contact via the heat transfer member of). As a result, the heat transfer plate 14 thermally connects the battery cell 12 and the fixed member M. In particular, the surface of the extending portion 14b opposite to the side wall portion 13a is a heat transfer surface 14s that thermally connects the battery cell 12 to the fixed member M. That is, the battery unit 11 is arranged so that the heat transfer surface 14s faces the fixed member M.

引き続いて図１を参照する。拘束固定機構２０は、第１方向に沿って積層体１０に拘束荷重を負荷する。また、拘束固定機構２０は、第１方向における積層体１０の両端側において積層体１０を全体として被固定部材Ｍに対して固定する。より具体的には、拘束固定機構２０は、第１方向及び第１方向に交差する第２方向（ここではＹ軸方向）について、積層体１０を被固定部材Ｍに固定する。第２方向は、第１方向に交差する方向であって、被固定部材Ｍから離れる方向である。 Subsequently, reference is made to FIG. The restraint fixing mechanism 20 applies a restraint load to the laminated body 10 along the first direction. Further, the restraint fixing mechanism 20 fixes the laminated body 10 as a whole to the fixed member M on both end sides of the laminated body 10 in the first direction. More specifically, the restraint fixing mechanism 20 fixes the laminated body 10 to the fixed member M in the first direction and the second direction (here, the Y-axis direction) intersecting the first direction. The second direction is a direction that intersects the first direction and is a direction away from the fixed member M.

一方、拘束固定機構２０は、例えば、電池セル１２が膨張したときに、その膨張分だけ、電池セル１２（電池ユニット１１）が拘束荷重に抗しつつ第１方向に沿ってスライド可能なように、積層体１０を被固定部材Ｍに固定している。なお、ここでの電池セル１２がスライド可能であるとは、電池モジュール１の組み立ての際に電池セル１２を初期拘束した状態において、電池セル１２が第１方向について位置決めされており、且つ、電池セル１２の劣化等に応じて電池セル１２が膨張した際に、その膨張量の分だけ電池セル１２が第１方向に沿って移動可能であることを意味する。拘束固定機構２０についてより具体的に詳細に説明する。 On the other hand, the restraint fixing mechanism 20 allows, for example, when the battery cell 12 expands, the battery cell 12 (battery unit 11) can slide along the first direction while resisting the restraint load by the expansion. , The laminated body 10 is fixed to the fixed member M. The fact that the battery cell 12 is slidable here means that the battery cell 12 is positioned in the first direction and the battery is in a state where the battery cell 12 is initially restrained when the battery module 1 is assembled. This means that when the battery cell 12 expands due to deterioration of the cell 12, the battery cell 12 can move along the first direction by the amount of expansion. The restraint fixing mechanism 20 will be described in more detail.

一対の拘束固定機構２０のうちの積層体１０の一方の端部側に位置する拘束固定機構２０Ａは、ブラケット２１と、弾性部材２２と、を含む。一対の拘束固定機構２０のうちの積層体１０の他方の端部側に位置する拘束固定機構２０Ｂは、ブラケット２１を含む。ここでは、拘束固定機構２０Ａがブラケット２１及び弾性部材２２であり、拘束固定機構２０Ｂがブラケット２１である。このため、電池モジュール１においては、積層体１０の一方の端部側のみに弾性部材２２が配置されることになる。 The restraint fixing mechanism 20A located on one end side of the laminated body 10 of the pair of restraint fixing mechanisms 20 includes a bracket 21 and an elastic member 22. The restraint fixing mechanism 20B located on the other end side of the laminated body 10 of the pair of restraint fixing mechanisms 20 includes the bracket 21. Here, the restraint fixing mechanism 20A is the bracket 21 and the elastic member 22, and the restraint fixing mechanism 20B is the bracket 21. Therefore, in the battery module 1, the elastic member 22 is arranged only on one end side of the laminated body 10.

ブラケット２１は、第１方向に交差する第２方向及び第３方向に沿って延びる板状の拘束部２１ａと、第１方向に沿って拘束部２１ａから積層体１０の外側に向けて延びる板状の固定部（第２固定部）２１ｂと、を含む。ここでは、ブラケット２１は、拘束部２１ａと固定部２１ｂとによってＬ字板状に形成されている。拘束部２１ａは、第１方向に沿って電池セル１２共に配列されている。拘束部２１ａには、貫通孔が形成されている。拘束部２１ａは、その貫通孔に挿通される締結部材３０のボルト３１によって互いに締結されることにより、第１方向に沿って積層体１０に拘束荷重を負荷する。 The bracket 21 has a plate-shaped restraint portion 21a extending along the second and third directions intersecting the first direction, and a plate-like restraint portion 21a extending from the restraint portion 21a along the first direction toward the outside of the laminated body 10. 21b and a fixed portion (second fixed portion) of the above. Here, the bracket 21 is formed in an L-shape by the restraint portion 21a and the fixing portion 21b. The restraint portion 21a is arranged together with the battery cells 12 along the first direction. A through hole is formed in the restraint portion 21a. The restraint portions 21a are fastened to each other by bolts 31 of the fastening member 30 inserted into the through holes, thereby applying a restraint load to the laminated body 10 along the first direction.

固定部２１ｂには、貫通孔が形成されている。固定部２１ｂは、拘束部２１ａが積層体１０を拘束した状態において、その貫通孔に挿通されるボルトＢにより被固定部材Ｍに固定されることによって、積層体１０を被固定部材Ｍに固定する。その状態において、弾性部材２２は、積層体１０と共に拘束されている。したがって、拘束固定機構２０（ここでは拘束固定機構２０Ａ）は、例えば電池セル１２が膨張したときに、その膨張分だけ、弾性部材２２が第１方向に沿って変形することによって、電池セル１２の第１方向に沿ったスライドを許容する。 A through hole is formed in the fixing portion 21b. The fixing portion 21b fixes the laminated body 10 to the fixed member M by being fixed to the fixed member M by a bolt B inserted into the through hole in a state where the restraining portion 21a restrains the laminated body 10. .. In that state, the elastic member 22 is restrained together with the laminated body 10. Therefore, in the restraint fixing mechanism 20 (here, the restraint fixing mechanism 20A), for example, when the battery cell 12 expands, the elastic member 22 deforms along the first direction by the expansion of the battery cell 12, thereby causing the battery cell 12 to deform. Allows sliding along the first direction.

締結部材３０は、複数（例えば４つ）のボルト３１、及び、ボルト３１の数に対応する数のナット３２を含む。ボルト３１は、ブラケット２１の拘束部２１ａの貫通孔、及び、セルホルダ１３の突設部１３ｐの挿通孔１３ｈに挿通される。ナット３２は、拘束部２１ａの貫通孔及び挿通孔１３ｈに挿通された状態のボルト３１の端部に螺合される。これにより、締結部材３０は、拘束部２１ａ同士を互いに締結する。 The fastening member 30 includes a plurality of (for example, four) bolts 31 and a number of nuts 32 corresponding to the number of bolts 31. The bolt 31 is inserted into the through hole of the restraint portion 21a of the bracket 21 and the insertion hole 13h of the protruding portion 13p of the cell holder 13. The nut 32 is screwed into the through hole of the restraint portion 21a and the end of the bolt 31 inserted through the insertion hole 13h. As a result, the fastening member 30 fastens the restraint portions 21a to each other.

図３は、図１に示された電池モジュールの一部を示す図である。図３の（ａ）は平面図であり、図３の（ｂ）は図１の領域ＡＲの拡大断面図である。図１，３に示されるように、固定部材４０は、一対の拘束固定機構２０Ａ，２０Ｂの間に配置され、積層体１０を被固定部材Ｍに固定する。固定部材４０は、第１方向に沿って電池セル１２と共に配列された板状部４１と、板状部４１と一体に形成され、被固定部材Ｍに固定されることによって少なくとも第２方向について積層体１０を被固定部材Ｍに固定する一対の固定部（第１固定部）４２と、を含む。板状部４１は、第２方向及び第３方向に沿って延びている。 FIG. 3 is a diagram showing a part of the battery module shown in FIG. FIG. 3A is a plan view, and FIG. 3B is an enlarged cross-sectional view of the region AR of FIG. As shown in FIGS. 1 and 3, the fixing member 40 is arranged between the pair of restraint fixing mechanisms 20A and 20B, and fixes the laminated body 10 to the fixed member M. The fixing member 40 is formed integrally with the plate-shaped portion 41 arranged together with the battery cell 12 along the first direction and the plate-shaped portion 41, and is laminated to the fixed member M in at least the second direction. A pair of fixing portions (first fixing portions) 42 for fixing the body 10 to the fixed member M are included. The plate-shaped portion 41 extends along the second direction and the third direction.

固定部材４０は、ここでは、板状部４１が積層体１０と弾性部材２２との間に介在するように配置されている。すなわち、ここでは、固定部材４０は、第１方向における積層体１０の一端側に配置されている。板状部４１には、ボルト３１が挿通される貫通孔が設けられている。これにより、板状部４１は、積層体１０の撓み（ボルト３１の撓み）を、貫通孔の内面とボルト３１の外周面とのクリアランスの範囲に抑制するように機能する。また、板状部４１は、弾性部材２２から積層体１０への拘束荷重を第１方向に交差する面内において均一化する機能を有する。つまり、固定部材４０は、積層体１０と弾性部材２２との間に配置されたミドルプレートとしての機能を有する。 Here, the fixing member 40 is arranged so that the plate-shaped portion 41 is interposed between the laminated body 10 and the elastic member 22. That is, here, the fixing member 40 is arranged on one end side of the laminated body 10 in the first direction. The plate-shaped portion 41 is provided with a through hole through which the bolt 31 is inserted. As a result, the plate-shaped portion 41 functions to suppress the bending of the laminated body 10 (the bending of the bolt 31) within the range of the clearance between the inner surface of the through hole and the outer peripheral surface of the bolt 31. Further, the plate-shaped portion 41 has a function of equalizing the restraining load from the elastic member 22 to the laminated body 10 in the plane intersecting in the first direction. That is, the fixing member 40 has a function as a middle plate arranged between the laminated body 10 and the elastic member 22.

固定部４２は、板状部４１の下端側において板状部４１の両側に突設されている。固定部４２のそれぞれには、貫通孔（第１貫通孔）４２ｈが設けられている。固定部４２は、貫通孔４２ｈに挿通されるボルトＢによって被固定部材Ｍに固定されている。貫通孔４２ｈは、第１方向に沿って延びる長穴である。したがって、固定部４２は、少なくとも第２方向について、ボルトＢによって被固定部材Ｍに固定された状態において、ボルトＢに対する貫通孔４２ｈの第１方向に沿った相対的な位置の変化を許容する。 The fixing portions 42 are projected on both sides of the plate-shaped portion 41 on the lower end side of the plate-shaped portion 41. Each of the fixing portions 42 is provided with a through hole (first through hole) 42h. The fixing portion 42 is fixed to the fixed member M by a bolt B inserted through the through hole 42h. The through hole 42h is an elongated hole extending along the first direction. Therefore, the fixing portion 42 allows a change in the relative position of the through hole 42h with respect to the bolt B along the first direction in a state of being fixed to the fixed member M by the bolt B at least in the second direction.

これにより、固定部材４０は、少なくとも第２方向について被固定部材Ｍに固定された状態において、貫通孔４２ｈの寸法に応じた距離だけ第１方向に沿ってスライド可能とされている。したがって、上述したように電池セル１２の膨張により電池セル１２がスライドしたときに、固定部材４０は、積層体１０の第２方向についての固定を維持しながら、電池セル１２と共に同方向にスライドする。 As a result, the fixing member 40 can slide along the first direction by a distance corresponding to the size of the through hole 42h in a state of being fixed to the fixed member M in at least the second direction. Therefore, as described above, when the battery cell 12 slides due to the expansion of the battery cell 12, the fixing member 40 slides in the same direction together with the battery cell 12 while maintaining the fixation of the laminated body 10 in the second direction. ..

以上説明したように、この電池モジュール１においては、拘束固定機構２０が、第１方向（積層方向）に沿って互いに積層された複数の電池セル１２を含む積層体１０に対して拘束荷重を加えると共に、電池セル１２が拘束荷重に抗しながら積層方向に沿ってスライド可能なように、積層体１０の両端側において積層体１０を被固定部材Ｍに固定している。したがって、電池セル１２が膨張した場合に電池セル１２のスライドが許容されるので、電池セル１２の膨張に起因した積層体１０の撓みが抑制される。さらに、電池モジュール１にあっては、拘束固定機構２０の間において、固定部材４０が積層体１０を被固定部材Ｍに固定している。したがって、電池モジュール１に振動や衝撃が加わった際の積層体１０の撓みが抑制される。 As described above, in the battery module 1, the restraint fixing mechanism 20 applies a restraint load to the laminated body 10 including a plurality of battery cells 12 stacked on each other along the first direction (stacking direction). At the same time, the laminated body 10 is fixed to the fixed member M on both end sides of the laminated body 10 so that the battery cell 12 can slide along the stacking direction while resisting the restraint load. Therefore, since the battery cell 12 is allowed to slide when the battery cell 12 expands, the bending of the laminated body 10 due to the expansion of the battery cell 12 is suppressed. Further, in the battery module 1, the fixing member 40 fixes the laminated body 10 to the fixed member M between the restraint fixing mechanisms 20. Therefore, the bending of the laminated body 10 when a vibration or an impact is applied to the battery module 1 is suppressed.

特に、電池モジュール１においては、拘束固定機構２０は、それぞれ、第１方向に沿って電池セル１２と共に配列され積層体１０に拘束荷重を負荷する拘束部２１ａと、被固定部材Ｍに固定されることによって積層体１０を被固定部材Ｍに固定する固定部２１ｂと、を有する。そして、拘束固定機構２０Ａは、拘束部２１ａと積層体１０との間に配置された弾性部材２２を含む。これにより、拘束固定機構２０Ａは、弾性部材２２の第１方向に沿った変形によって、電池セル１２のスライドを許容する。 In particular, in the battery module 1, the restraint fixing mechanism 20 is fixed to the restraint portion 21a, which is arranged together with the battery cell 12 along the first direction and applies a restraint load to the laminate 10, and the fixed member M, respectively. Thereby, it has a fixing portion 21b for fixing the laminated body 10 to the fixed member M. The restraint fixing mechanism 20A includes an elastic member 22 arranged between the restraint portion 21a and the laminated body 10. As a result, the restraint fixing mechanism 20A allows the battery cell 12 to slide due to the deformation of the elastic member 22 along the first direction.

このように、弾性部材２２の変形によって電池セル１２をスライド可能とすれば、電池セル１２の膨張に起因した積層体１０の撓みを確実に抑制可能である。一方、この場合には、図１の（ｂ）の破線に示されるように、例えば電池セル１２の膨張時や電池モジュール１に振動・衝撃が加えられたときに、弾性部材２２が剪断変形することによって、積層体１０における弾性部材２２側の部分が撓みやすくなる（たわみ量が大きくなる）。このため、固定部材４０によって撓みを抑制することがより有効である。 If the battery cell 12 can be slid by the deformation of the elastic member 22 in this way, the bending of the laminated body 10 due to the expansion of the battery cell 12 can be reliably suppressed. On the other hand, in this case, as shown by the broken line in FIG. 1B, the elastic member 22 is sheared and deformed, for example, when the battery cell 12 is expanded or when vibration or shock is applied to the battery module 1. As a result, the portion of the laminated body 10 on the elastic member 22 side is easily bent (the amount of deflection is increased). Therefore, it is more effective to suppress the bending by the fixing member 40.

特に、電池モジュール１においては、固定部材４０が、第１方向に沿って電池セル１２と共に配列された板状部４１と、板状部４１と一体に形成され、被固定部材Ｍに固定されることによって積層体１０を被固定部材Ｍに固定する固定部４２と、を含む。そして、電池モジュール１においては、固定部材４０が、その板状部４１が積層体１０と弾性部材２２との間に介在するように配置されている。このため、図１の（ｂ）の実線に示されるように、積層体１０における弾性部材２２側の部分の撓みを効果的に抑制可能である。 In particular, in the battery module 1, the fixing member 40 is integrally formed with the plate-shaped portion 41 arranged together with the battery cell 12 along the first direction and the plate-shaped portion 41, and is fixed to the fixed member M. This includes a fixing portion 42 for fixing the laminated body 10 to the fixed member M. Then, in the battery module 1, the fixing member 40 is arranged so that the plate-shaped portion 41 thereof is interposed between the laminated body 10 and the elastic member 22. Therefore, as shown by the solid line in FIG. 1B, it is possible to effectively suppress the bending of the portion of the laminated body 10 on the elastic member 22 side.

なお、電池モジュール１においては、固定部材４０の固定部４２には、貫通孔４２ｈが設けられており、固定部４２は、貫通孔４２ｈに挿通されるボルトＢによって被固定部材Ｍに固定されている。そして、貫通孔４２ｈは、第１方向に沿って延びる長穴である。このため、貫通孔に４２ｈ対するボルトＢの相対的な位置の変化（第１方向に沿った変化）によって固定部材４０のスライドが許容される。すなわち、電池セル１２が膨張した場合に、固定部材４０がスライドすることによって、電池セル１２のスライドが阻害されない。このため、電池セル１２の膨張に起因した積層体１０の撓みを確実に抑制可能である。
［第２実施形態］ In the battery module 1, the fixing portion 42 of the fixing member 40 is provided with a through hole 42h, and the fixing portion 42 is fixed to the fixed member M by a bolt B inserted through the through hole 42h. There is. The through hole 42h is an elongated hole extending along the first direction. Therefore, a change in the position of the bolt B relative to the through hole for 42 hours (change along the first direction) allows the fixing member 40 to slide. That is, when the battery cell 12 expands, the fixing member 40 slides, so that the slide of the battery cell 12 is not hindered. Therefore, the bending of the laminated body 10 due to the expansion of the battery cell 12 can be reliably suppressed.
[Second Embodiment]

引き続いて、電池モジュールの第２実施形態について説明する。図４は、本実施形態に係る電池モジュールを示す図である。図４の（ａ）は電池モジュールの模式的な側面図であり、図４の（ｂ）は撓みに関する特性を示すグラフである。図４に示されるように、本実施形態に係る電池モジュール２は、第１実施形態に係る電池モジュール１と比較して、固定部材４０の位置が異なる。電池モジュール２の他の点は、電池モジュール１と同様である。 Subsequently, a second embodiment of the battery module will be described. FIG. 4 is a diagram showing a battery module according to the present embodiment. FIG. 4A is a schematic side view of the battery module, and FIG. 4B is a graph showing characteristics related to bending. As shown in FIG. 4, the battery module 2 according to the present embodiment has a different position of the fixing member 40 as compared with the battery module 1 according to the first embodiment. The other points of the battery module 2 are the same as those of the battery module 1.

より具体的には、電池モジュール２においては、固定部材４０は、その板状部４１が電池セル１２の間に介在するように配置されている。ここでは、固定部材４０は、その板状部４１が第１方向における積層体１０の中央に位置するように（すなわち、板状部４１の両側の電池セル１２の個数が同じになるように）配置されている。これにより、図４の（ｂ）の実線に示されるように、固定部材４０に対応する位置において、積層体１０の撓みが抑制される。なお、同図に示されるように、固定部材４０を積層体１０の中央に配置した場合（実線）であっても、破線に示される固定部材４０を用いない場合と比較して、弾性部材２２側の撓み（さらには全体の撓み）も抑制される。 More specifically, in the battery module 2, the fixing member 40 is arranged so that the plate-shaped portion 41 thereof is interposed between the battery cells 12. Here, the fixing member 40 has the plate-shaped portion 41 located at the center of the laminated body 10 in the first direction (that is, the number of battery cells 12 on both sides of the plate-shaped portion 41 is the same). Have been placed. As a result, as shown by the solid line in FIG. 4B, the deflection of the laminated body 10 is suppressed at the position corresponding to the fixing member 40. As shown in the figure, even when the fixing member 40 is arranged in the center of the laminated body 10 (solid line), the elastic member 22 is compared with the case where the fixing member 40 shown by the broken line is not used. Side deflection (and overall deflection) is also suppressed.

このような電池モジュール２においても、電池モジュール１と同様に効果を奏することができる。特に、電池モジュール２にあっては、例えば、弾性部材２２の剛性が比較的大きく剪断変形しにくく、且つ、積層体１０の全体の剛性が低く撓みやすい場合に効果的である。すなわち、そのような場合においては、電池モジュール２のように固定部材４０を弾性部材２２から離して電池セル１２間に配置することによって、積層体１０の全体の撓みを効果的に抑制可能である。なお、固定部材４０の位置は、積層体１０の中央に限定されない。すなわち、固定部材４０は、第１方向における積層体１０の一方側（又は他方側）に偏って配置されていてもよい。
［第３実施形態］ Even in such a battery module 2, the same effect as that of the battery module 1 can be obtained. In particular, the battery module 2 is effective when, for example, the elasticity of the elastic member 22 is relatively large and shear deformation is difficult, and the overall rigidity of the laminated body 10 is low and it is easy to bend. That is, in such a case, by arranging the fixing member 40 away from the elastic member 22 and between the battery cells 12 like the battery module 2, it is possible to effectively suppress the bending of the entire laminated body 10. .. The position of the fixing member 40 is not limited to the center of the laminated body 10. That is, the fixing member 40 may be unevenly arranged on one side (or the other side) of the laminated body 10 in the first direction.
[Third Embodiment]

引き続いて、電池モジュールの第３実施形態について説明する。図５は、本実施形態に係る電池モジュールを示す図である。図５の（ａ）は電池モジュールの模式的な側面図であり、図５の（ｂ）は撓みに関する特性を示すグラフである。図５に示されるように、本実施形態に係る電池モジュール３は、第１実施形態に係る電池モジュール１と比較して、固定部材４０の位置及び数が異なる。電池モジュール３の他の点は、電池モジュール１と同様である。 Subsequently, a third embodiment of the battery module will be described. FIG. 5 is a diagram showing a battery module according to the present embodiment. FIG. 5A is a schematic side view of the battery module, and FIG. 5B is a graph showing characteristics related to bending. As shown in FIG. 5, the battery module 3 according to the present embodiment is different from the battery module 1 according to the first embodiment in the position and number of the fixing members 40. The other points of the battery module 3 are the same as those of the battery module 1.

より具体的には、電池モジュール３は、２つの固定部材４０を備えている。ここでは、２つの固定部材４０は、それぞれ、板状部４１が電池セル１２の間に介在するように配置されている。一方の固定部材４０は、その板状部４１が第１方向における積層体１０の中央に位置するように配置されている。また、他方の固定部材４０は、その板状部４１が第１方向における積層体１０の中央よりも一方の端部側（弾性部材２２側）に位置するように配置されている。そして、固定部材４０同士の間には、複数の電池セル１２が介在している。 More specifically, the battery module 3 includes two fixing members 40. Here, the two fixing members 40 are arranged so that the plate-shaped portion 41 is interposed between the battery cells 12, respectively. One fixing member 40 is arranged so that its plate-shaped portion 41 is located at the center of the laminated body 10 in the first direction. Further, the other fixing member 40 is arranged so that the plate-shaped portion 41 is located on one end side (elastic member 22 side) of the center of the laminated body 10 in the first direction. A plurality of battery cells 12 are interposed between the fixing members 40.

このような電池モジュール３においても、第１実施形態に係る電池モジュール１、及び、第２実施形態に係る電池モジュール２と同様の効果を奏することができる。特に、電池モジュール３は、２つの固定部材４０を備え、固定部材４０同士の間には、電池セル１２が介在している。このように、２つの固定部材４０を用いれば、図５の（ｂ）の実線に示されるように、積層体１０の撓みをより確実に抑制可能である。 Even in such a battery module 3, the same effects as those of the battery module 1 according to the first embodiment and the battery module 2 according to the second embodiment can be obtained. In particular, the battery module 3 includes two fixing members 40, and a battery cell 12 is interposed between the fixing members 40. As described above, when the two fixing members 40 are used, the bending of the laminated body 10 can be more reliably suppressed as shown by the solid line in FIG. 5 (b).

なお、電池モジュール３においては、固定部材４０の個数、及び、位置は、図５の例に限定されない。電池モジュール３は、例えば、３つ以上の固定部材４０を備えていてもよい（すなわち、固定部材４０は２つ以上であればよい）。また、例えば、一の固定部材４０を、その板状部４１が電池セル１２の間に介在するように配置すると共に、別の固定部材４０を、その板状部４１が積層体１０と弾性部材２２との間に介在するように配置してもよい。さらに、その一の固定部材４０の位置は、積層体１０の中央でもなくてもよい。
［第４実施形態］ In the battery module 3, the number and positions of the fixing members 40 are not limited to the example of FIG. The battery module 3 may include, for example, three or more fixing members 40 (that is, the number of fixing members 40 may be two or more). Further, for example, one fixing member 40 is arranged so that the plate-shaped portion 41 is interposed between the battery cells 12, and another fixing member 40 is arranged such that the plate-shaped portion 41 is the laminated body 10 and the elastic member. It may be arranged so as to intervene between 22 and 22. Further, the position of the one fixing member 40 does not have to be the center of the laminated body 10.
[Fourth Embodiment]

引き続いて、電池モジュールの第４実施形態について説明する。図６は、本実施形態に係る電池モジュールを示す図である。図６の（ａ）は電池モジュールの模式的な側面図であり、図６の（ｂ）は図６の（ａ）の領域ＢＲの拡大断面図である。図６に示されるように、本実施形態に係る電池モジュール４は、第２実施形態に係る電池モジュール２と比較して、拘束固定機構２０の構成、及び、固定部材４０の構成が異なる。電池モジュール４の他の点は、電池モジュール２と同様である。 Subsequently, a fourth embodiment of the battery module will be described. FIG. 6 is a diagram showing a battery module according to the present embodiment. FIG. 6A is a schematic side view of the battery module, and FIG. 6B is an enlarged cross-sectional view of the region BR of FIG. 6A. As shown in FIG. 6, the battery module 4 according to the present embodiment is different from the battery module 2 according to the second embodiment in the configuration of the restraint fixing mechanism 20 and the configuration of the fixing member 40. Other points of the battery module 4 are the same as those of the battery module 2.

より具体的には、電池モジュール４においては、拘束固定機構２０のうちの拘束固定機構２０Ｂも、ブラケット２１と弾性部材２２とを含む。すなわち、電池モジュール４においては、拘束固定機構２０のそれぞれが、弾性部材２２を含む。したがって、ここでは、積層体１０の両端側に弾性部材２２が配置されることになる。このため、拘束固定機構２０Ｂも、例えば電池セル１２が膨張したときに、その膨張分だけ弾性部材２２が第１方向に沿って変形することによって、電池セル１２の第１方向に沿ったスライドを許容する。 More specifically, in the battery module 4, the restraint fixing mechanism 20B of the restraint fixing mechanisms 20 also includes the bracket 21 and the elastic member 22. That is, in the battery module 4, each of the restraint fixing mechanisms 20 includes an elastic member 22. Therefore, here, the elastic members 22 are arranged on both ends of the laminated body 10. Therefore, the restraint fixing mechanism 20B also slides along the first direction of the battery cell 12 by, for example, when the battery cell 12 expands, the elastic member 22 deforms along the first direction by the expansion. Tolerate.

また、ここでは、ブラケット２１が、固定部２１ｂに代えて固定部（第２固定部）２１ｃを含む。固定部２１ｃは、固定部２１ｂと同様に、拘束部２１ａから積層体１０の外側に向けて第１方向に沿って延びる板状となっている。したがって、ここでも、ブラケット２１は、拘束部２１ａと固定部２１ｃとによってＬ字板状に形成されている。固定部２１ｃには、貫通孔（第２貫通孔）２１ｈが形成されている。固定部２１ｃは、拘束部２１ａが積層体１０を拘束した状態において、その貫通孔２１ｈに挿通されるボルトＣにより被固定部材Ｍに固定されることによって、積層体１０を被固定部材Ｍに固定する。 Further, here, the bracket 21 includes a fixing portion (second fixing portion) 21c instead of the fixing portion 21b. Like the fixing portion 21b, the fixing portion 21c has a plate shape extending from the restraining portion 21a toward the outside of the laminated body 10 along the first direction. Therefore, here as well, the bracket 21 is formed in an L-shaped plate shape by the restraint portion 21a and the fixing portion 21c. A through hole (second through hole) 21h is formed in the fixing portion 21c. The fixing portion 21c fixes the laminated body 10 to the fixed member M by being fixed to the fixed member M by a bolt C inserted through the through hole 21h in a state where the restraining portion 21a restrains the laminated body 10. To do.

特に、貫通孔２１ｈは、第１方向に沿って延びる長穴である。したがって、拘束固定機構２０Ａ，２０Ｂは、少なくとも第２方向について、ボルトＣによってブラケット２１が被固定部材Ｍに固定された状態において、ボルトＣに対する貫通孔２１ｈの第１方向に沿った相対的な位置の変化を許容する。 In particular, the through hole 21h is an elongated hole extending along the first direction. Therefore, the restraint fixing mechanisms 20A and 20B are positioned relative to the bolt C along the first direction of the through hole 21h in a state where the bracket 21 is fixed to the fixed member M by the bolt C at least in the second direction. Tolerate changes in.

これにより、ブラケット２１（拘束部２１ａ）は、少なくとも第２方向について被固定部材Ｍに固定された状態において、貫通孔２１ｈの寸法に応じた距離だけ第１方向に沿ってスライド可能とされている。したがって、電池セル１２の膨張により電池セル１２がスライドしたときに、ブラケット２１は、積層体１０の第２方向についての固定を維持しながら、電池セル１２と共に同方向にスライドする。この構成について具体的に説明する。 As a result, the bracket 21 (restraint portion 21a) can slide along the first direction by a distance corresponding to the dimension of the through hole 21h in a state of being fixed to the fixed member M in at least the second direction. .. Therefore, when the battery cell 12 slides due to the expansion of the battery cell 12, the bracket 21 slides in the same direction together with the battery cell 12 while maintaining the fixation of the laminate 10 in the second direction. This configuration will be specifically described.

図６の（ｂ）に示されるように、固定部２１ｃの固定に用いられるボルトＣは、頭部Ｃ１と、ねじ山が形成された軸部Ｃ２と、頭部Ｃ１と軸部Ｃ２とを接続する接続部Ｃ３と、からなる。接続部Ｃ３は、頭部Ｃ１よりも小さく軸部Ｃ２よりも大きな柱形状を呈している。つまり、ボルトＣは、段付ボルトである。接続部Ｃ３には、ねじ山が形成されていない。このようなボルトＣは、貫通孔２１ｈに挿通された状態において、軸部Ｃ２と接続部Ｃ３との間の段差部分が被固定部材Ｍに接触するまで、軸部Ｃ２が被固定部材Ｍのねじ穴に螺合される。 As shown in FIG. 6B, the bolt C used for fixing the fixing portion 21c connects the head portion C1, the shaft portion C2 having the thread formed, and the head portion C1 and the shaft portion C2. It is composed of a connecting portion C3 to be connected. The connecting portion C3 has a pillar shape smaller than the head portion C1 and larger than the shaft portion C2. That is, the bolt C is a stepped bolt. No thread is formed in the connection portion C3. In such a bolt C, in a state of being inserted through the through hole 21h, the shaft portion C2 is a screw of the fixed member M until the stepped portion between the shaft portion C2 and the connecting portion C3 comes into contact with the fixed member M. Screwed into the hole.

これにより、固定部２１ｃの表面（被固定部材Ｍと反対側の面）から頭部Ｃ１の裏面（固定部２１ｃの表面に対向する面）までの距離が、固定部２１ｃの厚さ及び接続部Ｃ３の長さに応じて一定となる。固定部２１ｃの表面と頭部Ｃ１の裏面との間には、例えばバネ等の弾性部材Ｄが配置されている。この弾性部材Ｄには、当該一定の距離に応じた圧縮量が付与される。これにより、固定部２１ｃを固定する力が、弾性部材Ｄの圧縮量に応じて一定となる。したがって、弾性部材Ｄの設計によって、電池セル１２の初期圧縮の際の荷重にスライドせずに耐え、且つ、その後の電池セル１２の膨張の際には第１方向にスライドするように、ブラケット２１の固定の形態を設計できる。 As a result, the distance from the front surface of the fixed portion 21c (the surface opposite to the fixed member M) to the back surface of the head C1 (the surface facing the surface of the fixed portion 21c) is the thickness of the fixed portion 21c and the connecting portion. It becomes constant according to the length of C3. An elastic member D such as a spring is arranged between the front surface of the fixing portion 21c and the back surface of the head C1. A compression amount corresponding to the constant distance is applied to the elastic member D. As a result, the force for fixing the fixing portion 21c becomes constant according to the amount of compression of the elastic member D. Therefore, due to the design of the elastic member D, the bracket 21 can withstand the load during the initial compression of the battery cell 12 without sliding, and slide in the first direction during the subsequent expansion of the battery cell 12. Can be designed in a fixed form.

また、電池モジュール４においては、固定部材４０は、その板状部４１が電池セル１２の間に介在するように配置されている。この例では、固定部材４０は、その板状部４１が積層体１０の中央に位置するように配置されている。一方、固定部材４０の固定部４２に設けられた貫通孔４２ｈは、長穴でなく、ボルトＢの形状に応じた形状である。したがって、ボルトＢに対する貫通孔４２ｈの相対的な位置の変化は生じない。つまり、電池モジュール４においては、固定部材４０はスライドしない。これは、電池セル１２の膨張による変位を、積層体１０の両端側の弾性部材２２及び拘束固定機構２０によって許容可能であるためである。 Further, in the battery module 4, the fixing member 40 is arranged so that the plate-shaped portion 41 thereof is interposed between the battery cells 12. In this example, the fixing member 40 is arranged so that the plate-shaped portion 41 is located at the center of the laminated body 10. On the other hand, the through hole 42h provided in the fixing portion 42 of the fixing member 40 is not an elongated hole but a shape corresponding to the shape of the bolt B. Therefore, the relative position of the through hole 42h with respect to the bolt B does not change. That is, in the battery module 4, the fixing member 40 does not slide. This is because the displacement due to the expansion of the battery cell 12 can be tolerated by the elastic members 22 on both ends of the laminated body 10 and the restraint fixing mechanism 20.

このような電池モジュール４においても、固定部材４０がスライド可能なことによる効果を除いて、第２実施形態に係る電池モジュール２と同様の効果を奏することができる。特に、電池モジュール４においては、拘束固定機構２０のそれぞれが、弾性部材２２を含み、積層体１０の両端側に弾性部材２２が配置される。このため、電池セル１２の膨張に起因した積層体１０の撓みをより確実に抑制可能である。 In such a battery module 4, the same effect as that of the battery module 2 according to the second embodiment can be obtained except for the effect that the fixing member 40 is slidable. In particular, in the battery module 4, each of the restraint fixing mechanisms 20 includes elastic members 22, and elastic members 22 are arranged on both ends of the laminated body 10. Therefore, the bending of the laminated body 10 due to the expansion of the battery cell 12 can be more reliably suppressed.

また、電池モジュール４においては、積層体１０の両端側に、剪断変形するおそれのある弾性部材２２が配置されているので、固定部材４０によって積層体１０の撓みを抑制することの有効性が高い。また、電池モジュール４においては、電池セル１２のスライドが、積層体１０の両端側の弾性部材２２によって許容されるので（すなわち両側に分散されるので）、それぞれの電池セル１２のスライド量を低減することが可能である。 Further, in the battery module 4, since elastic members 22 that may be sheared and deformed are arranged on both ends of the laminated body 10, it is highly effective to suppress the bending of the laminated body 10 by the fixing member 40. .. Further, in the battery module 4, since the sliding of the battery cells 12 is allowed by the elastic members 22 on both ends of the laminated body 10 (that is, because they are dispersed on both sides), the sliding amount of each battery cell 12 is reduced. It is possible to do.

さらに、電池モジュール４においては、拘束固定機構２０の固定部２１ｃには、貫通孔２１ｈが設けられており、固定部２１ｃは、貫通孔２１ｈに挿通されるボルトＣによって被固定部材Ｍに固定される。貫通孔２１ｈは、第１方向に沿って延びる長穴である。そして、拘束固定機構２０は、ボルトＣに対する貫通孔２１ｈの第１方向に沿った相対的な位置の変化によって、電池セル１２のスライドを許容する。 Further, in the battery module 4, the fixing portion 21c of the restraint fixing mechanism 20 is provided with a through hole 21h, and the fixing portion 21c is fixed to the fixed member M by a bolt C inserted through the through hole 21h. The module. The through hole 21h is an elongated hole extending along the first direction. Then, the restraint fixing mechanism 20 allows the battery cell 12 to slide due to a change in the relative position of the through hole 21h with respect to the bolt C along the first direction.

このように、この電池モジュール４においては、拘束固定機構２０の固定部２１ｃを利用して、電池セル１２をスライド可能とすることができる。つまり、図６の例では弾性部材２２を用いているが、弾性部材２２を用いない場合であっても、電池セル１２の膨張に起因した積層体１０の撓みを抑制可能である。ただし、図６の例のように、弾性部材２２を併せて利用すれば、電池セル１２のスライドを確実に許容可能となる。
［第５実施形態］ As described above, in the battery module 4, the battery cell 12 can be made slidable by using the fixing portion 21c of the restraint fixing mechanism 20. That is, although the elastic member 22 is used in the example of FIG. 6, even when the elastic member 22 is not used, the bending of the laminated body 10 due to the expansion of the battery cell 12 can be suppressed. However, if the elastic member 22 is also used as in the example of FIG. 6, the slide of the battery cell 12 can be reliably allowed.
[Fifth Embodiment]

引き続いて、電池モジュールの第５実施形態について説明する。図７は、本実施形態に係る電池モジュールを示す図である。図７に示されるように、本実施形態に係る電池モジュール５は、第４実施形態に係る電池モジュール４と比較して、積層体１０の拘束の態様、及び、固定部材４０に代えて固定部材５０を備える点が異なる。電池モジュール５の他の点は、電池モジュール４と同様である。より具体的に説明する。 Subsequently, a fifth embodiment of the battery module will be described. FIG. 7 is a diagram showing a battery module according to the present embodiment. As shown in FIG. 7, the battery module 5 according to the present embodiment has a mode of restraining the laminated body 10 and a fixing member instead of the fixing member 40 as compared with the battery module 4 according to the fourth embodiment. The difference is that it has 50. Other points of the battery module 5 are the same as those of the battery module 4. This will be described more specifically.

電池モジュール５においては、積層体１０は、複数の電池セル１２の一部を含む第１部分１０Ａと、複数の電池セル１２の残部を含む第２部分１０Ｂと、を有する。一例として、ここでは、第１部分１０Ａに含まれる電池セル１２の個数と、第２部分１０Ｂに含まれる電池セル１２の個数と、が互いに同一である。すなわち、ここでは、積層体１０が第１部分１０Ａと第２部分１０Ｂとに２分割されている。 In the battery module 5, the laminate 10 has a first portion 10A including a part of the plurality of battery cells 12 and a second portion 10B including the rest of the plurality of battery cells 12. As an example, here, the number of battery cells 12 included in the first portion 10A and the number of battery cells 12 included in the second portion 10B are the same. That is, here, the laminated body 10 is divided into a first portion 10A and a second portion 10B.

固定部材５０は、第１部分１０Ａと第２部分１０Ｂとの間に配置されている。より具体的には、固定部材５０は、第１方向に沿って電池セル１２と共に配列された板状部５１と、板状部５１と一体に形成され、被固定部材Ｍに固定されることによって積層体１０を被固定部材Ｍに固定する固定部（第１固定部）５２と、を含む。固定部材５０は、その板状部５１が第１部分１０Ａと第２部分１０Ｂとの間に位置するように配置されている。 The fixing member 50 is arranged between the first portion 10A and the second portion 10B. More specifically, the fixing member 50 is formed integrally with the plate-shaped portion 51 arranged together with the battery cell 12 along the first direction and the plate-shaped portion 51, and is fixed to the fixed member M. A fixing portion (first fixing portion) 52 for fixing the laminated body 10 to the fixed member M is included. The fixing member 50 is arranged so that the plate-shaped portion 51 is located between the first portion 10A and the second portion 10B.

すなわち、ここでは、固定部材５０は、その板状部５１が、第１部分１０Ａに属する電池セル１２と、第２部分１０Ｂに属する電池セル１２との間に介在するように配置されている。また、固定部５２は、ボルトＢが挿通されることにより被固定部材Ｍに固定される。固定部５２に設けられたボルトＢの挿通孔は、長穴でなく、ボルトＢの形状に応じた形状である。したがって、電池モジュール５においては、固定部材５０はスライドしない。 That is, here, the fixing member 50 is arranged such that the plate-shaped portion 51 is interposed between the battery cell 12 belonging to the first portion 10A and the battery cell 12 belonging to the second portion 10B. Further, the fixing portion 52 is fixed to the fixed member M by inserting the bolt B. The insertion hole of the bolt B provided in the fixing portion 52 is not an elongated hole but a shape corresponding to the shape of the bolt B. Therefore, in the battery module 5, the fixing member 50 does not slide.

そして、拘束固定機構２０は、拘束部２１ａのそれぞれを固定部材５０の板状部５１に締結することにより、一方の拘束部２１ａ（ここでは、拘束固定機構２０Ａの拘束部２１ａ）と固定部材５０とによって第１部分１０Ａに拘束荷重を負荷すると共に、他方の拘束部２１ａ（ここでは、拘束固定機構２０Ｂの拘束部２１ａ）と固定部材５０とによって第２部分１０Ｂに拘束荷重を負荷する。拘束部２１ａは、それぞれ、締結部材３０のボルト３１によって固定部材５０に締結される。ボルト３１は、その頭部と反対側の先端部が固定部材５０のねじ穴に螺合される。 Then, the restraint fixing mechanism 20 fastens each of the restraint portions 21a to the plate-shaped portion 51 of the fixing member 50, thereby causing one of the restraint portions 21a (here, the restraint portion 21a of the restraint fixing mechanism 20A) and the fixing member 50. A restraining load is applied to the first portion 10A, and a restraining load is applied to the second portion 10B by the other restraint portion 21a (here, the restraint portion 21a of the restraint fixing mechanism 20B) and the fixing member 50. Each of the restraint portions 21a is fastened to the fixing member 50 by the bolt 31 of the fastening member 30. The tip of the bolt 31 on the opposite side of the head is screwed into the screw hole of the fixing member 50.

このような電池モジュール５においても、第４実施形態に係る電池モジュール４と同様の効果を奏することができる。特に、この電池モジュール５においては、積層体１０が、複数の電池セル１２の一部を含む第１部分１０Ａと、複数の電池セル１２の残部を含む第２部分１０Ｂと、を有し、固定部材５０が、第１部分１０Ａと第２部分１０Ｂとの間に配置されている。そして、拘束固定機構２０は、拘束部２１ａのそれぞれを固定部材５０に締結することにより、一方の拘束部２１ａと固定部材５０とによって第１部分１０Ａに拘束荷重を負荷すると共に、他方の拘束部２１ａと固定部材５０とによって第２部分１０Ｂに拘束荷重を負荷する。 Even in such a battery module 5, the same effect as that of the battery module 4 according to the fourth embodiment can be obtained. In particular, in the battery module 5, the laminated body 10 has a first portion 10A including a part of the plurality of battery cells 12 and a second portion 10B including the rest of the plurality of battery cells 12 and is fixed. The member 50 is arranged between the first portion 10A and the second portion 10B. Then, the restraint fixing mechanism 20 applies a restraint load to the first portion 10A by one of the restraint portions 21a and the fixing member 50 by fastening each of the restraint portions 21a to the fixing member 50, and the other restraint portion 20a. A restraining load is applied to the second portion 10B by the 21a and the fixing member 50.

このように、電池モジュール５においては、積層体１０の第１部分１０Ａと第２部分１０Ｂとの間に配置された固定部材５０を用いて、拘束部２１ａの締結を行えば、積層体１０の両端の拘束部２１ａ同士を締結する場合と比較して、締結のためのボルト３１を短くできる。これにより、コストを低減できる。また、生産性が向上する。 As described above, in the battery module 5, if the restraint portion 21a is fastened by using the fixing member 50 arranged between the first portion 10A and the second portion 10B of the laminate 10, the laminate 10 The bolt 31 for fastening can be shortened as compared with the case where the restraining portions 21a at both ends are fastened to each other. As a result, the cost can be reduced. In addition, productivity is improved.

以上の実施形態は、本発明に係る電池モジュールの一実施形態について説明したものである。したがって、本発明に係る電池モジュールは、上述した電池モジュール１〜５に限定されない。本発明に係る電池モジュールは、各請求項の要旨を変更しない範囲において、上述した電池モジュール１〜５を任意に変形可能である。 The above-described embodiment describes one embodiment of the battery module according to the present invention. Therefore, the battery module according to the present invention is not limited to the battery modules 1 to 5 described above. The battery module according to the present invention can arbitrarily modify the above-mentioned battery modules 1 to 5 as long as the gist of each claim is not changed.

例えば、上述した電池モジュール１〜５は、その各部の構成を互いに適用可能である。具体的には、例えば、電池モジュール１，２，４，５に対して、電池モジュール３のように複数の固定部材４０を用いる構成を適用してもよい。また、電池モジュール１〜３に対して、電池モジュール４，５のように、拘束固定機構２０Ａ，２０Ｂのそれぞれが弾性部材２２を有する構成や、固定部２１ｃを適用してもよい。 For example, the above-mentioned battery modules 1 to 5 can apply the configurations of their respective parts to each other. Specifically, for example, a configuration using a plurality of fixing members 40 like the battery module 3 may be applied to the battery modules 1, 2, 4, and 5. Further, the restraint fixing mechanisms 20A and 20B may each have an elastic member 22 or the fixing portion 21c may be applied to the battery modules 1 to 3 as in the battery modules 4 and 5.

逆に、電池モジュール４，５に対して、電池モジュール１〜３のように、拘束固定機構２０のうちの一方の拘束固定機構２０Ａのみが弾性部材２２を有する構成を適用してもよい。また、電池モジュール４，５にあっては、拘束固定機構２０のいずれもが弾性部材２２を有していなくてもよい。また、電池モジュール２〜５に対して、電池モジュール１のように、固定部材４０を、その板状部４１が積層体１０と弾性部材２２との間に介在するように配置する構成を適用してもよい。さらに、電池モジュール１〜５の変形は、これらの態様に限らず、任意に、各部の構成を相互に適用可能である。 Conversely, a configuration in which only one of the restraint fixing mechanisms 20 A of the restraint fixing mechanisms 20 has the elastic member 22 may be applied to the battery modules 4 and 5, as in the battery modules 1 to 3. Further, in the battery modules 4 and 5, none of the restraint fixing mechanisms 20 may have the elastic member 22. Further, to the battery modules 2 to 5, a configuration is applied in which the fixing member 40 is arranged so that the plate-shaped portion 41 thereof is interposed between the laminated body 10 and the elastic member 22 like the battery module 1. You may. Further, the modifications of the battery modules 1 to 5 are not limited to these modes, and the configurations of the respective parts can be arbitrarily applied to each other.

１〜５…電池モジュール、１０…積層体、１０Ａ…第１部分、１０Ｂ…第２部分、１２…電池セル、２０，２０Ａ，２０Ｂ…拘束固定機構、２１ａ…拘束部、２１ｂ，２１ｃ…固定部（第２固定部）、２１ｈ…貫通孔（第２貫通孔）、２２…弾性部材、４０，５０…固定部材、４１，５１…板状部、４２，５２…固定部（第１固定部）、４２ｈ…貫通孔（第１貫通孔）、Ｍ…被固定部材。 1 to 5 ... Battery module, 10 ... Laminated body, 10A ... 1st part, 10B ... 2nd part, 12 ... Battery cell, 20, 20A, 20B ... Restraint fixing mechanism, 21a ... Restraint part, 21b, 21c ... Fixing part (Second fixing part), 21h ... Through hole (second through hole), 22 ... Elastic member, 40, 50 ... Fixing member, 41, 51 ... Plate-shaped part, 42, 52 ... Fixing part (First fixing part) , 42h ... Through hole (first through hole), M ... Fixed member.

Claims

A laminate containing a plurality of battery cells laminated to each other along the first direction, and
A pair of restraint fixing mechanisms for applying a restraining load to the laminated body along the first direction and fixing the laminated body to a fixed member on both end sides of the laminated body in the first direction. ,
A fixing member arranged between the pair of restraint fixing mechanisms and fixing the laminated body to the fixed member is provided.
The restraint fixing mechanism fixes the laminated body to the fixed member so that the battery cell can slide along the first direction while resisting the restraint load .
The restraint fixing mechanism is arranged together with the battery cells along the first direction to load the restraint load on the laminate, and the laminate is fixed to the fixed member by bolts to fix the laminate. It has a second fixing part that is fixed to the member to be fixed, and
An elastic member is arranged between the second fixing portion and the bolt.
The second fixing portion is fixed by a force corresponding to the amount of compression of the elastic member.
Battery module.

The fixing member is formed integrally with the plate-shaped portion arranged together with the battery cell along the first direction and the plate-shaped portion, and is fixed to the fixed member to attach the laminated body to the covering. Including a first fixing portion for fixing to a fixing member,
The battery module according to claim 1.

The first fixing portion is provided with a first through hole.
The first fixing portion is fixed to the fixed member by a bolt inserted into the first through hole.
The first through hole is an elongated hole extending along the first direction.
The battery module according to claim 2.

At least one of the restraint fixing mechanisms includes another elastic member disposed between the restraint portion and the laminate.
The restraint fixing mechanism allows the slide of the battery cell by deformation of the other elastic member along the first direction.
The battery module according to claim 2 or 3 .

Each of the restraint fixing mechanisms includes the other elastic member.
The battery module according to claim 4 .

The fixing member is arranged so that the plate-shaped portion is interposed between the laminated body and the other elastic member.
The battery module according to claim 4 or 5 .

The fixing member is arranged so that the plate-shaped portion is interposed between the battery cells.
The battery module according to any one of claims 2 to 6 .

The second fixing portion is provided with a second through hole.
It said second fixing portion is fixed to said member to be fixed by the bolt which is inserted through the second through hole,
The second through hole is an elongated hole extending along the first direction.
The constraining fixing mechanism, by the relative change in position of which along the first direction of the second through-hole for said bolt, to permit the sliding of the battery cell,
The battery module according to any one of claims 1 to 7 .

The laminate has a first portion including a part of the plurality of battery cells and a second portion including the rest of the plurality of battery cells.
The fixing member is arranged between the first portion and the second portion.
In the restraint fixing mechanism, by fastening each of the restraint portions to the fixing member, the restraint load is applied to the first portion by one of the restraint portions and the fixing member, and the other restraint portion is applied. And the fixing member, the restraining load is applied to the second portion.
The battery module according to any one of claims 1 to 8 .

With two or more of the fixing members
The battery cell is interposed between the fixing members.
The battery module according to any one of claims 1 to 9 .

A laminate containing a plurality of battery cells laminated to each other along the first direction, and
A pair of restraint fixing mechanisms for applying a restraining load to the laminated body along the first direction and fixing the laminated body to a fixed member on both end sides of the laminated body in the first direction. ,
A fixing member arranged between the pair of restraint fixing mechanisms and fixing the laminated body to the fixed member is provided.
The restraint fixing mechanism fixes the laminated body to the fixed member so that the battery cell can slide along the first direction while resisting the restraint load.
The fixing member is formed integrally with the plate-shaped portion arranged together with the battery cell along the first direction and the plate-shaped portion, and is fixed to the fixed member to attach the laminated body to the covering. Including a first fixing portion for fixing to a fixing member,
The first fixing portion is provided with a first through hole.
The first fixing portion is fixed to the fixed member by a bolt inserted into the first through hole.
The first through hole is an elongated hole extending along the first direction.
Battery module.