JP2016012456A - Battery module - Google Patents
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- JP2016012456A JP2016012456A JP2014133161A JP2014133161A JP2016012456A JP 2016012456 A JP2016012456 A JP 2016012456A JP 2014133161 A JP2014133161 A JP 2014133161A JP 2014133161 A JP2014133161 A JP 2014133161A JP 2016012456 A JP2016012456 A JP 2016012456A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
本発明は、複数の電池セルを備える電池モジュールに関する。 The present invention relates to a battery module including a plurality of battery cells.
二次電池の電極は、充放電に伴い膨張と収縮を繰り返す。電極の膨張と収縮が繰り返されると、電極同士の間隔が大きくなったり、電極が歪むことで二次電池の抵抗値が大きくなる。 The electrode of the secondary battery repeats expansion and contraction with charge / discharge. When the expansion and contraction of the electrodes are repeated, the resistance value of the secondary battery increases because the distance between the electrodes increases or the electrodes are distorted.
特許文献１では、複数の電池セル（電池素子）が並んで設けられている。複数の電池セルは正極と、負極と、正極と負極との間に設けられたセパレータとを有している。複数の電池セルは、エンドプレート（樹脂）によって挟み込まれており、エンドプレートは、電池セルの膨張を抑制するように正極若しくは負極からセパレータへ加圧力を付与している。これにより、正極と負極との間隔が大きくなったり、正極や負極が歪むことが抑制されている。 In Patent Document 1, a plurality of battery cells (battery elements) are provided side by side. The plurality of battery cells have a positive electrode, a negative electrode, and a separator provided between the positive electrode and the negative electrode. The plurality of battery cells are sandwiched between end plates (resins), and the end plates apply pressure from the positive electrode or the negative electrode to the separator so as to suppress expansion of the battery cells. Thereby, it is suppressed that the space | interval of a positive electrode and a negative electrode becomes large, or a positive electrode and a negative electrode are distorted.
ところで、エンドプレートからの拘束荷重が電池セルの一部分に集中するなど、電池セルに加わる拘束荷重に偏りが生じていると、電池セルの劣化（リチウムイオン電池であればリチウムの析出など）を招くため、電池セルに加わる拘束荷重の偏りを小さくすることが望まれている。 By the way, if the restraint load applied to the battery cell is biased, for example, the restraint load from the end plate is concentrated on a part of the battery cell, the battery cell is deteriorated (such as lithium deposition in the case of a lithium ion battery). Therefore, it is desired to reduce the bias of the restraining load applied to the battery cell.
本発明の目的は、電池セルに加わる拘束荷重の偏りを小さくすることができる電池モジュールを提供することにある。 The objective of this invention is providing the battery module which can make small the bias | bias of the restraint load added to a battery cell.
上記課題を解決する電池モジュールは、並設された複数の電池セルと、被固定部材に固定される固定端と、前記固定端とは反対側に設けられた非固定端とを有するとともに、前記複数の電池セルを並設方向の両側から挟持するエンドプレートと、前記エンドプレートと前記電池セルとの間に設けられて、前記電池セルの膨張を弾性変形により吸収する弾性部材と、各エンドプレートに互いに近付く方向に荷重を加えている加圧部材と、を備えた電池モジュールであって、前記弾性部材は、低弾性部と、前記低弾性部と並んで設けられ、前記低弾性部よりも弾性率の高い高弾性部とを有し、前記低弾性部が前記固定端側に位置し、前記高弾性部が前記非固定端側に位置している。 A battery module that solves the above-described problem has a plurality of battery cells arranged side by side, a fixed end that is fixed to a fixed member, and a non-fixed end that is provided on the opposite side of the fixed end. An end plate that sandwiches a plurality of battery cells from both sides in the side-by-side direction, an elastic member that is provided between the end plate and the battery cell and absorbs expansion of the battery cell by elastic deformation, and each end plate A pressure member that applies a load in a direction approaching each other, wherein the elastic member is provided alongside the low elastic portion and the low elastic portion, and more than the low elastic portion. A high elastic part having a high elastic modulus, the low elastic part is located on the fixed end side, and the high elastic part is located on the non-fixed end side.
これによれば、電池セルが膨張すると、エンドプレートには弾性部材を介して荷重が加わる。このとき、エンドプレートの固定端は、被固定部材に固定されている一方で、非固定端は被固定部材に固定されていないため、エンドプレートは、非固定端が弾性部材（電池セル）から離間するように変形する。すると、エンドプレートから弾性部材への拘束荷重は、固定端側からの拘束荷重に比べて非固定端側からの拘束荷重のほうが小さくなる。しかしながら、固定端側には低弾性部が位置し、非固定端側には高弾性部が位置しているため、拘束荷重の大きい固定端側からの荷重は低弾性部の弾性変形によって多く吸収され、拘束荷重の小さい非固定端側からの荷重は高弾性部が弾性変形しにくく、電池セルに均等に荷重が加わりやすい。したがって、エンドプレートから電池セルへの拘束荷重の偏りを小さくすることができる。 According to this, when the battery cell expands, a load is applied to the end plate via the elastic member. At this time, the fixed end of the end plate is fixed to the fixed member, while the non-fixed end is not fixed to the fixed member. Therefore, the non-fixed end of the end plate is from the elastic member (battery cell). Deforms to be separated. Then, the restraint load from the end plate to the elastic member is smaller than the restraint load from the fixed end side compared to the restraint load from the fixed end side. However, since the low elastic part is located on the fixed end side and the high elastic part is located on the non-fixed end side, a large amount of load from the fixed end side with a large restraining load is absorbed by the elastic deformation of the low elastic part. Thus, the load from the non-fixed end side with a small restraining load is unlikely to cause the high elastic portion to be elastically deformed, and the load is easily applied evenly to the battery cells. Therefore, it is possible to reduce the bias of the restraining load from the end plate to the battery cell.
上記電池モジュールについて、前記低弾性部と、前記高弾性部とは弾性率の異なる異種材料であることが好ましい。
これによれば、弾性部材を容易に構成することができる。
In the battery module, the low elastic portion and the high elastic portion are preferably different materials having different elastic moduli.
According to this, an elastic member can be comprised easily.
本発明によれば、電池セルに加わる拘束荷重の偏りを小さくすることができる。 According to the present invention, the bias of the restraining load applied to the battery cell can be reduced.
以下、電池モジュールの一実施形態について説明する。
図１に示すように、電池モジュール１０は、被固定部材としての筐体４１に収容されている。電池モジュール１０は、並設された複数の電池セル１１と、電池セル１１を並設方向の両側から挟持するエンドプレート１２，１３とを有している。各電池セル１１は、それぞれ個別の電池ホルダ４２に保持されている。電池セル１１は、例えば、リチウムイオン電池などの二次電池である。本実施形態のエンドプレート１２，１３は、略Ｌ字状に形成され、板材を折り曲げ加工したものであり、電池セル１１を挟持する板状の挟持部１４と、筐体４１に電池モジュール１０を固定するための板状の固定部１５とを有している。本実施形態では、挟持部１４は矩形状であり、固定部１５は挟持部１４の長手方向第１端部１６から挟持部１４の厚み方向に延びている。挟持部１４の短手方向の両端部には、それぞれ、挟持部１４の短手方向に向けて突出する挿通部１８が設けられている。
Hereinafter, an embodiment of the battery module will be described.
As shown in FIG. 1, the battery module 10 is accommodated in a casing 41 as a fixed member. The battery module 10 includes a plurality of battery cells 11 arranged side by side, and end plates 12 and 13 that sandwich the battery cell 11 from both sides in the direction of arrangement. Each battery cell 11 is held by an individual battery holder 42. The battery cell 11 is a secondary battery such as a lithium ion battery, for example. The end plates 12 and 13 of the present embodiment are formed in a substantially L shape and are formed by bending a plate material. The battery module 10 is mounted on a casing 41 and a plate-shaped holding portion 14 that holds the battery cell 11. It has the plate-shaped fixing | fixed part 15 for fixing. In the present embodiment, the sandwiching portion 14 has a rectangular shape, and the fixing portion 15 extends from the first longitudinal end portion 16 of the sandwiching portion 14 in the thickness direction of the sandwiching portion 14. At both end portions of the sandwiching portion 14 in the short side direction, insertion portions 18 that project toward the short side direction of the sandwiching portion 14 are provided.
各エンドプレート１２，１３のうち、一方を第１のエンドプレート１２とし、第１のエンドプレート１２とは異なるエンドプレート１３を第２のエンドプレート１３とすると、第１のエンドプレート１２と、第１のエンドプレート１２に隣り合う電池セル１１との間には弾性部材３１が設けられている。弾性部材３１は、板状であり、厚み方向が電池セル１１の並設方向と一致している。 If one of the end plates 12, 13 is the first end plate 12 and the end plate 13 different from the first end plate 12 is the second end plate 13, the first end plate 12, An elastic member 31 is provided between the battery cells 11 adjacent to one end plate 12. The elastic member 31 has a plate shape, and the thickness direction coincides with the juxtaposed direction of the battery cells 11.
第２のエンドプレート１３の挿通部１８には、第１のエンドプレート１２の挿通部１８に向けてボルト１９が挿通されている。第２のエンドプレート１３の挿通部１８を挿通したボルト１９には、第１のエンドプレート１２の挿通部１８を挿通した位置でナット２０が螺合されている。これにより、第１のエンドプレート１２及び第２のエンドプレート１３には、互いに近付く方向に拘束荷重が加わっている。この拘束荷重は、電池セル１１及び弾性部材３１に付与されている。したがって、ボルト１９及びナット２０が加圧部材として機能している。 A bolt 19 is inserted into the insertion portion 18 of the second end plate 13 toward the insertion portion 18 of the first end plate 12. A nut 20 is screwed into the bolt 19 inserted through the insertion portion 18 of the second end plate 13 at a position where the insertion portion 18 of the first end plate 12 is inserted. Thereby, a restraining load is applied to the first end plate 12 and the second end plate 13 in a direction approaching each other. This restraining load is applied to the battery cell 11 and the elastic member 31. Therefore, the bolt 19 and the nut 20 function as a pressure member.
図２に示すように、電池セル１１は、ケース２１の内部に電極組立体２２を有している。電極組立体２２は、正負の電極の間にセパレータを介在させたものである。
弾性部材３１は、低弾性部材３２と、低弾性部材３２よりも弾性率の高い高弾性部材３３とを有している。低弾性部材３２と、高弾性部材３３とはともに矩形板状である。弾性部材３１は、低弾性部材３２と高弾性部材３３とを並べて一体化したものである。低弾性部材３２は、弾性部材３１の低弾性部を構成し、高弾性部材３３は弾性部材３１の高弾性部を構成している。低弾性部材３２は、例えば、ゴムスポンジなどであり、高弾性部材３３は、例えばゴムなどである。すなわち、低弾性部材３２と、高弾性部材３３とは、弾性率の異なる異種材料である。異種材料には、材質が同じであり、発泡率が異なるゴムスポンジなども含まれる。弾性部材３１は、低弾性部材３２が挟持部１４の長手方向第１端部１６側に位置し、高弾性部材３３が長手方向第１端部１６とは反対側の挟持部１４の長手方向第２端部１７側に位置するように配置されている。
As shown in FIG. 2, the battery cell 11 has an electrode assembly 22 inside a case 21. The electrode assembly 22 has a separator interposed between positive and negative electrodes.
The elastic member 31 includes a low elastic member 32 and a high elastic member 33 having a higher elastic modulus than the low elastic member 32. Both the low elastic member 32 and the high elastic member 33 have a rectangular plate shape. The elastic member 31 is formed by arranging a low elastic member 32 and a high elastic member 33 side by side. The low elastic member 32 constitutes a low elastic part of the elastic member 31, and the high elastic member 33 constitutes a high elastic part of the elastic member 31. The low elastic member 32 is, for example, a rubber sponge, and the high elastic member 33 is, for example, rubber. That is, the low elastic member 32 and the high elastic member 33 are different materials having different elastic moduli. The dissimilar materials include rubber sponges having the same material and different foaming rates. In the elastic member 31, the low elastic member 32 is positioned on the first end 16 side in the longitudinal direction of the sandwiching portion 14, and the high elastic member 33 is the first in the longitudinal direction of the sandwiching portion 14 on the side opposite to the first end 16 in the longitudinal direction. It arrange | positions so that it may be located in the 2 edge part 17 side.
そして、上記した電池モジュール１０の各エンドプレート１２，１３の固定部１５は、固定ボルト４３によって筐体４１の壁面に固定されている。したがって、各エンドプレート１２，１３における被固定部材に固定される固定端は、固定部１５が設けられた挟持部１４の長手方向第１端部１６である。また、挟持部１４の長手方向第２端部１７は、筐体４１に固定されておらず非固定端となっている。 The fixing portions 15 of the end plates 12 and 13 of the battery module 10 are fixed to the wall surface of the housing 41 by fixing bolts 43. Therefore, the fixed end fixed to the member to be fixed in each of the end plates 12 and 13 is the first longitudinal end portion 16 of the clamping portion 14 provided with the fixing portion 15. Further, the second end 17 in the longitudinal direction of the sandwiching portion 14 is not fixed to the housing 41 and is a non-fixed end.
次に、本実施形態の電池モジュール１０の作用について説明する。
電池セル１１の電極には、使用に伴って被膜が形成されていき、使用期間が長くなるにつれて電池セル１１が膨張していく。電池セル１１が膨張すると、隣り合う電池セル１１同士は互いに押し合う。すると、各電池セル１１には電池セル１１の並設方向に向けた力が作用する。第１のエンドプレート１２と、第１のエンドプレート１２に隣り合う電池セル１１との間に弾性部材３１を設けることで、電池セル１１の膨張を弾性変形によって吸収して、電池セル１１の膨張に伴う各エンドプレート１２，１３への荷重の増加を抑制している。
Next, the operation of the battery module 10 of the present embodiment will be described.
A film is formed on the electrode of the battery cell 11 with use, and the battery cell 11 expands as the use period becomes longer. When the battery cells 11 expand, the adjacent battery cells 11 are pressed against each other. Then, a force directed in the direction in which the battery cells 11 are arranged acts on each battery cell 11. By providing the elastic member 31 between the first end plate 12 and the battery cell 11 adjacent to the first end plate 12, the expansion of the battery cell 11 is absorbed by elastic deformation and the expansion of the battery cell 11 is achieved. The increase of the load to each end plate 12 and 13 accompanying with is suppressed.
第１のエンドプレート１２には、弾性部材３１を介して荷重が加わる。第１のエンドプレート１２の挟持部１４は、長手方向第１端部１６が筐体４１に固定されており、長手方向第２端部１７が筐体４１に固定されていないため、長手方向第２端部１７側が弾性部材３１から離れる方向に移動しやすい。 A load is applied to the first end plate 12 via the elastic member 31. The sandwiching portion 14 of the first end plate 12 has a longitudinal first end 16 fixed to the casing 41 and a longitudinal second end 17 not fixed to the casing 41. The two end portions 17 are easily moved away from the elastic member 31.
図３に示すように、第１のエンドプレート１２は、固定部１５と挟持部１４との境目を基点として挟持部１４の長手方向第２端部１７が弾性部材３１から離れるように変形する。すると、挟持部１４の長手方向第２端部１７側から弾性部材３１に加わる拘束荷重が、長手方向第１端部１６側に比べて小さくなる。挟持部１４の長手方向第１端部１６側の部位と、電池セル１１との間には、低弾性部材３２が設けられ、挟持部１４の長手方向第２端部１７側の部位と、電池セル１１との間には、高弾性部材３３が設けられている。高弾性部材３３は、低弾性部材３２に比べて弾性変形しにくいため、高弾性部材３３に加わった拘束荷重は高弾性部材３３に吸収されにくく、低弾性部材３２に加わった拘束荷重は、低弾性部材３２が弾性変形することで低弾性部材３２に吸収されやすい。 As shown in FIG. 3, the first end plate 12 is deformed so that the second end 17 in the longitudinal direction of the clamping part 14 is separated from the elastic member 31 with the boundary between the fixing part 15 and the clamping part 14 as a starting point. Then, the restraining load applied to the elastic member 31 from the longitudinal direction second end portion 17 side of the sandwiching portion 14 becomes smaller than that of the longitudinal direction first end portion 16 side. A low-elasticity member 32 is provided between a portion on the first end 16 side in the longitudinal direction of the sandwiching portion 14 and the battery cell 11, a portion on the second end 17 side in the longitudinal direction of the sandwiching portion 14, and the battery. A highly elastic member 33 is provided between the cells 11. Since the high-elasticity member 33 is less likely to be elastically deformed than the low-elasticity member 32, the restraining load applied to the high-elasticity member 33 is not easily absorbed by the high-elasticity member 33, and the restraining load applied to the low-elasticity member 32 is low. The elastic member 32 is easily absorbed by the low elastic member 32 due to elastic deformation.
したがって、上記実施形態によれば、以下のような効果を得ることができる。
（１）弾性部材３１の低弾性部材３２は、挟持部１４の長手方向第１端部１６側に位置し、高弾性部材３３は挟持部１４の長手方向第２端部１７側に位置している。低弾性部材３２は弾性変形しやすく、拘束荷重を吸収しやすいが、高弾性部材３３は弾性変形しにくく、拘束荷重を吸収しにくいため、挟持部１４の長手方向第２端部１７が弾性部材３１から離間するように変形しても、電池セル１１に加わる拘束荷重の偏りが小さい。このため、電池セル１１の劣化が抑制される。
Therefore, according to the above embodiment, the following effects can be obtained.
(1) The low elastic member 32 of the elastic member 31 is located on the first end 16 side in the longitudinal direction of the sandwiching portion 14, and the high elastic member 33 is located on the second end 17 side in the longitudinal direction of the sandwiching portion 14. Yes. The low elastic member 32 is easily elastically deformed and easily absorbs the restraining load, but the high elastic member 33 is hardly elastically deformed and hardly absorbs the restraining load. Therefore, the second end 17 in the longitudinal direction of the sandwiching portion 14 is the elastic member. Even if it is deformed so as to be separated from 31, the bias of the restraining load applied to the battery cell 11 is small. For this reason, deterioration of the battery cell 11 is suppressed.
（２）低弾性部材３２と、高弾性部材３３とは、弾性率の異なる異種材料であるため、同一の弾性率の材料の配置などを調整することで低弾性部と高弾性部を設ける場合に比べて、弾性部材３１を容易に構成することができる。 (2) Since the low elastic member 32 and the high elastic member 33 are different materials having different elastic moduli, the low elastic part and the high elastic part are provided by adjusting the arrangement of the materials having the same elastic modulus. As compared with the above, the elastic member 31 can be easily configured.
なお、実施形態は以下のように変更してもよい。
○図４に示すように、弾性部材３１は、それぞれが分離して設けられた複数の弾性体３５であってもよい。各弾性体３５は、全て同一の部材であり、挟持部１４の長手方向に沿って複数設けられている。弾性体３５は、短辺が電池セル１１に接し、長辺が第１のエンドプレート１２に接するような台形状である。そして、弾性体３５は、隣り合う弾性体３５同士の間隔が、挟持部１４の長手方向第１端部１６側に比べて、挟持部１４の長手方向第２端部１７側が短くなっている。すなわち、弾性体３５は、挟持部１４の長手方向第１端部１６側に比べて、挟持部１４の長手方向第２端部１７側の方が密に配置されている。そして、弾性体３５が疎に配置された部分は、低弾性部を構成し、弾性体３５が密に配置された部分は、弾性体３５が疎に配置された部分に比べて弾性率が高くなり、高弾性部を構成している。この場合、同一の弾性体３５を用いて低弾性部と高弾性部を構成することができ、部品点数が少なくなる。また、弾性体３５を台形にすることで、弾性体３５の弾性変形時に、弾性体が傾きにくい。なお、弾性体３５は、短辺が第１のエンドプレート１２に接し、長辺が電池セル１１に接するような台形状でもよい。
In addition, you may change embodiment as follows.
As shown in FIG. 4, the elastic member 31 may be a plurality of elastic bodies 35 provided separately from each other. The elastic bodies 35 are all the same member, and a plurality of elastic bodies 35 are provided along the longitudinal direction of the sandwiching portion 14. The elastic body 35 has a trapezoidal shape with a short side in contact with the battery cell 11 and a long side in contact with the first end plate 12. In the elastic body 35, the distance between the adjacent elastic bodies 35 is shorter on the second end 17 side in the longitudinal direction of the sandwiching portion 14 than on the first end 16 side in the longitudinal direction of the sandwiching portion 14. That is, the elastic body 35 is more densely arranged on the second end 17 side in the longitudinal direction of the sandwiching portion 14 than on the first end 16 side in the longitudinal direction of the sandwiching portion 14. The portion where the elastic bodies 35 are sparsely arranged constitutes a low elastic portion, and the portion where the elastic bodies 35 are densely arranged has a higher elastic modulus than the portion where the elastic bodies 35 are sparsely arranged. It constitutes a highly elastic part. In this case, a low elastic part and a high elastic part can be comprised using the same elastic body 35, and a number of parts decreases. In addition, by making the elastic body 35 trapezoidal, the elastic body hardly tilts when the elastic body 35 is elastically deformed. The elastic body 35 may have a trapezoidal shape with a short side in contact with the first end plate 12 and a long side in contact with the battery cell 11.
○低弾性部と、高弾性部とは、弾性率の異なるバネなどでもよい。
○低弾性部材３２と、高弾性部材３３は異なる形状であってもよい。
○弾性部材３１は、第１のエンドプレート１２と電池セル１１との間に加えて、第２のエンドプレート１３と電池セル１１との間に設けられていてもよい。
○ The low elastic portion and the high elastic portion may be springs having different elastic moduli.
The low elastic member 32 and the high elastic member 33 may have different shapes.
The elastic member 31 may be provided between the second end plate 13 and the battery cell 11 in addition to between the first end plate 12 and the battery cell 11.
○エンドプレート１２，１３は、固定部１５に換えて、別体の固定部材によって筐体４１に固定されていてもよい。固定部材は、挟持部１４の長手方向第１端部１６側に固定される。この場合であっても、固定部材が筐体４１の壁面に固定されることで、挟持部１４の長手方向第１端部１６は、弾性部材３１から離間しにくく、長手方向第２端部１７は弾性部材３１から離間しやすい。 The end plates 12 and 13 may be fixed to the casing 41 by a separate fixing member instead of the fixing portion 15. The fixing member is fixed to the first end portion 16 side in the longitudinal direction of the sandwiching portion 14. Even in this case, since the fixing member is fixed to the wall surface of the casing 41, the first end 16 in the longitudinal direction of the sandwiching portion 14 is not easily separated from the elastic member 31, and the second end 17 in the longitudinal direction. Is easily separated from the elastic member 31.
○被固定部材は、産業車両に搭載されるカウンタウェイトなどであってもよい。
○弾性部材３１は、弾性率の異なる弾性部を３種類以上有していてもよい。例えば、挟持部１４の長手方向第１端部１６と電池セル１１との間の部分から、挟持部１４の長手方向第２端部１７と電池セル１１との間の部分に向けて徐々に弾性率が高くなるように弾性部が設けられていてもよい。
The fixed member may be a counterweight mounted on an industrial vehicle.
The elastic member 31 may have three or more types of elastic parts having different elastic moduli. For example, the elasticity gradually increases from the portion between the first end 16 in the longitudinal direction of the sandwiching portion 14 and the battery cell 11 toward the portion between the second end 17 in the longitudinal direction of the sandwiching portion 14 and the battery cell 11. An elastic part may be provided so as to increase the rate.
○各電池セル１１間に電池セル１１を加圧するための加圧プレートを設けてもよい。
○加圧部材は、第１のエンドプレート１２から第２のエンドプレート１３まで延びてそれぞれのエンドプレート１２，１３に固定される金属製のバンドであってもよい。
A pressure plate for pressing the battery cell 11 may be provided between the battery cells 11.
The pressurizing member may be a metal band that extends from the first end plate 12 to the second end plate 13 and is fixed to the end plates 12 and 13.
１０…電池モジュール、１１…電池セル、１２，１３…エンドプレート、１６…長手方向第１端部、１７…長手方向第２端部、１９…ボルト、２０…ナット、３１…弾性部材、３２…低弾性部材、３３…高弾性部材、４１…筐体。 DESCRIPTION OF SYMBOLS 10 ... Battery module, 11 ... Battery cell, 12, 13 ... End plate, 16 ... First longitudinal end, 17 ... Second longitudinal end, 19 ... Bolt, 20 ... Nut, 31 ... Elastic member, 32 ... Low elastic member, 33... High elastic member, 41.
Claims (2)
被固定部材に固定される固定端と、前記固定端とは反対側に設けられた非固定端とを有するとともに、前記複数の電池セルを並設方向の両側から挟持するエンドプレートと、
前記エンドプレートと前記電池セルとの間に設けられて、前記電池セルの膨張を弾性変形により吸収する弾性部材と、
各エンドプレートに互いに近付く方向に荷重を加えている加圧部材と、を備えた電池モジュールであって、
前記弾性部材は、低弾性部と、前記低弾性部と並んで設けられ、前記低弾性部よりも弾性率の高い高弾性部とを有し、
前記低弾性部が前記固定端側に位置し、前記高弾性部が前記非固定端側に位置している電池モジュール。 A plurality of battery cells arranged side by side;
An end plate that has a fixed end fixed to a fixed member, and a non-fixed end provided on the opposite side of the fixed end, and sandwiches the plurality of battery cells from both sides in the juxtaposition direction;
An elastic member that is provided between the end plate and the battery cell and absorbs expansion of the battery cell by elastic deformation;
A pressure member applying a load in a direction approaching each end plate, and a battery module comprising:
The elastic member has a low elastic part and a high elastic part that is provided side by side with the low elastic part and has a higher elastic modulus than the low elastic part,
The battery module in which the low elastic portion is located on the fixed end side and the high elastic portion is located on the non-fixed end side.
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