JP2020113463A - Battery pack - Google Patents

Battery pack Download PDF

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JP2020113463A
JP2020113463A JP2019004227A JP2019004227A JP2020113463A JP 2020113463 A JP2020113463 A JP 2020113463A JP 2019004227 A JP2019004227 A JP 2019004227A JP 2019004227 A JP2019004227 A JP 2019004227A JP 2020113463 A JP2020113463 A JP 2020113463A
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battery pack
secondary batteries
pair
battery
end plates
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JP7099336B2 (en
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雄介 來間
Yusuke Kuruma
雄介 來間
武仁 依田
Takehito Yoda
武仁 依田
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

To provide a battery pack in which short circuit between a secondary battery and a restraint member can be suppressed.SOLUTION: A battery pack 1 comprises a plurality of secondary batteries 10 arranged so as to be lined up in one direction, a pair of end plates 20 arranged at both ends in the one direction, of the plurality of secondary batteries, and a restraint member 30 that restrains the plurality of secondary batteries and the pair of end plates. The restraint member 30 is made of an insulating film wrapped around the plurality of secondary batteries 10 and the pair of end plates 20.SELECTED DRAWING: Figure 1

Description

本開示は、電池パックに関する。 The present disclosure relates to battery packs.

たとえば、特開２０１３−１１４７４６号公報（以下、「特許文献１」という。）には、複数の単電池からなる電池スタックと、一対のエンドプレートと、拘束バンドと、を備える蓄電装置が開示されている。複数の単電池は、一方向に並ぶように配置されている。各エンドプレートは、一方向における電池スタックの両側に配置されている。拘束バンドは、導電性を有する材料からなり、一対のエンドプレートに対して一対のエンドプレートが互いに近づく方向の力を付与した状態において一対のエンドプレートに連結されている。 For example, Japanese Patent Application Laid-Open No. 2013-114746 (hereinafter referred to as “Patent Document 1”) discloses a power storage device including a battery stack including a plurality of cells, a pair of end plates, and a restraining band. ing. The plurality of unit cells are arranged so as to be lined up in one direction. Each end plate is arranged on both sides of the battery stack in one direction. The restraint band is made of a conductive material, and is connected to the pair of end plates in a state in which a force is applied to the pair of end plates so that the pair of end plates approach each other.

特開２０１３−１１４７４６号公報JP, 2013-114746, A

特許文献１に記載される蓄電装置では、導電性を有する材料からなる拘束バンドと単電池とが短絡する懸念がある。 In the power storage device described in Patent Document 1, there is a concern that the restraint band made of a conductive material and the unit cell may be short-circuited.

本開示の目的は、二次電池と拘束部材との短絡を抑制可能な電池パックを提供することである。 An object of the present disclosure is to provide a battery pack that can suppress a short circuit between a secondary battery and a restraining member.

本開示に従った電池パックは、一方向に並ぶように配置された複数の二次電池と、前記一方向における前記複数の二次電池の両端に配置された一対のエンドプレートと、前記複数の二次電池および前記一対のエンドプレートを拘束する拘束部材と、を備える。前記拘束部材は、前記複数の二次電池および前記一対のエンドプレートの周囲に巻き付けられた絶縁フィルムからなる。 A battery pack according to the present disclosure includes a plurality of secondary batteries arranged so as to be arranged in one direction, a pair of end plates arranged at both ends of the plurality of secondary batteries in the one direction, and the plurality of the plurality of secondary batteries. A secondary battery and a restraint member that restrains the pair of end plates. The restraint member includes an insulating film wrapped around the plurality of secondary batteries and the pair of end plates.

本電池パックでは、複数の二次電池および一対のエンドプレートを拘束する拘束部材が、複数の二次電池および一対のエンドプレートの周囲に巻き付けられた絶縁フィルムからなるため、二次電池と拘束部材との短絡が抑制される。 In this battery pack, the restraining member that restrains the plurality of secondary batteries and the pair of end plates is composed of the insulating film wound around the plurality of secondary batteries and the pair of end plates. A short circuit with is suppressed.

以上に説明したように、本開示によれば、二次電池と拘束部材との短絡を抑制可能な電池パックを提供することができる。 As described above, according to the present disclosure, it is possible to provide a battery pack that can suppress a short circuit between the secondary battery and the restraining member.

本開示の一実施形態の電池パックの構成を概略的に示す斜視図である。FIG. 1 is a perspective view schematically showing a configuration of a battery pack according to an embodiment of the present disclosure. 図１に示される電池パックの製造工程を概略的に示す図である。FIG. 3 is a diagram schematically showing a manufacturing process of the battery pack shown in FIG. 1. 図１に示される電池パックの第１変形例を概略的に示す斜視図である。It is a perspective view which shows schematically the 1st modification of the battery pack shown by FIG. 図１に示される電池パックの第２変形例を概略的に示す斜視図である。It is a perspective view which shows schematically the 2nd modification of the battery pack shown by FIG. 図１に示される電池パックの第３変形例を概略的に示す平面図である。It is a top view which shows schematically the 3rd modification of the battery pack shown by FIG. 図５に示される電池パックの拘束部材の構成を概略的に示す図である。It is a figure which shows schematically the structure of the restraint member of the battery pack shown by FIG. 図１に示される電池パックの第４変形例を概略的に示す斜視図である。It is a perspective view which shows schematically the 4th modification of the battery pack shown by FIG. 図７におけるＶＩＩＩ−ＶＩＩＩ線での断面図である。It is sectional drawing in the VIII-VIII line in FIG.

本開示の実施形態について、図面を参照して説明する。なお、以下で参照する図面では、同一またはそれに相当する部材には、同じ番号が付されている。 Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are designated by the same reference numerals.

図１は、本開示の一実施形態の電池パックの構成を概略的に示す斜視図である。図２は、図１に示される電池パックの製造工程を概略的に示す図である。この電池パック１は、例えば、車両の車室内に搭載される。図１に示されるように、本実施形態の電池パック１は、複数の二次電池１０と、一対のエンドプレート２０と、拘束部材３０と、を有している。 FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure. FIG. 2 is a diagram schematically showing a manufacturing process of the battery pack shown in FIG. The battery pack 1 is mounted in, for example, a vehicle compartment of a vehicle. As shown in FIG. 1, the battery pack 1 of this embodiment includes a plurality of secondary batteries 10, a pair of end plates 20, and a restraining member 30.

複数の二次電池１０は、一方向に並ぶように配置されている。各二次電池１０は、容器１１と、正極端子１２と、負極端子１３と、を有している。 The plurality of secondary batteries 10 are arranged so as to be lined up in one direction. Each secondary battery 10 has a container 11, a positive electrode terminal 12, and a negative electrode terminal 13.

容器１１は、直方体形状に形成されている。容器１１は、正極（図示略）、負極（図示略）などを収容している。複数の容器１１は、各容器１１の厚さ方向が前記一方向と平行となるように配置されている。なお、互いに隣接する容器１１間には、絶縁材料からなるセパレータ（図示略）が配置されている。 The container 11 is formed in a rectangular parallelepiped shape. The container 11 contains a positive electrode (not shown), a negative electrode (not shown), and the like. The plurality of containers 11 are arranged such that the thickness direction of each container 11 is parallel to the one direction. A separator (not shown) made of an insulating material is arranged between the adjacent containers 11.

正極端子１２及び負極端子１３は、容器１１の上部に設けられている。正極端子１２及び負極端子１３は、容器１１の上面から上方に向かって突出する形状を有している。正極端子１２及び負極端子１３は、容器１１の幅方向に互いに離間した位置に配置されている。 The positive electrode terminal 12 and the negative electrode terminal 13 are provided on the upper portion of the container 11. The positive electrode terminal 12 and the negative electrode terminal 13 have a shape protruding upward from the upper surface of the container 11. The positive electrode terminal 12 and the negative electrode terminal 13 are arranged at positions separated from each other in the width direction of the container 11.

一対のエンドプレート２０は、前記一方向における前記複数の二次電池の両端に配置されている。各エンドプレート２０は、絶縁材料（例えば樹脂）からなる。一対のエンドプレート２０と複数の二次電池１０とにより電池スタック１５（図２を参照）を構成している。各エンドプレート２０は、直方体形状に形成されている。各エンドプレート２０のうち、前記一方向における外側でかつ当該エンドプレート２０の幅方向における外側に形成された角部２２は、湾曲するように形成されている。 The pair of end plates 20 are arranged at both ends of the plurality of secondary batteries in the one direction. Each end plate 20 is made of an insulating material (for example, resin). A battery stack 15 (see FIG. 2) is configured by the pair of end plates 20 and the plurality of secondary batteries 10. Each end plate 20 is formed in a rectangular parallelepiped shape. Of each end plate 20, a corner portion 22 formed on the outer side in the one direction and on the outer side in the width direction of the end plate 20 is formed to be curved.

拘束部材３０は、電池スタック１５を拘束している。拘束部材３０は、電池スタック１５の周囲に巻き付けられた絶縁フィルムＦからなる。具体的に、拘束部材３０は、各容器１１の側面および各エンドプレート２０の側面に巻き付けられている。絶縁フィルムＦは、高強度フィルム（例えば、一軸延伸ＰＥＴフィルム）からなる。絶縁フィルムＦの終端部は、電池スタック１５に巻き付けられた絶縁フィルムＦに熱融着されている。これにより、拘束部材３０に融着部３１が形成されている。拘束部材３０は、一対のエンドプレート２０に対して一対のエンドプレート２０が互いに近づく方向の力を付与した状態で電池スタック１５に巻き付けられている。 The restraint member 30 restrains the battery stack 15. The restraint member 30 is made of an insulating film F wrapped around the battery stack 15. Specifically, the restraint member 30 is wound around the side surface of each container 11 and the side surface of each end plate 20. The insulating film F is made of a high-strength film (for example, a uniaxially stretched PET film). The terminal portion of the insulating film F is heat-sealed to the insulating film F wound around the battery stack 15. As a result, the fusion bonding portion 31 is formed on the restraining member 30. The restraint member 30 is wound around the battery stack 15 while applying a force to the pair of end plates 20 in the direction in which the pair of end plates 20 approach each other.

次に、図２を参照しながら、電池スタック１５の周囲に拘束部材３０を設ける工程について説明する。図２に示されるように、電池スタック１５がターンテーブルＴ上に載置された状態において、拘束部材３０を構成する絶縁フィルムＦが巻き付けられたフィルムロールＲから絶縁フィルムＦが繰り出されつつ、ターンテーブルＴが回転することにより、電池スタック１５の周囲に絶縁フィルムＦが巻き付けられる。そして、絶縁フィルムＦの終端部が電池スタック１５に巻き付けられた絶縁フィルムＦに融着されることにより、電池スタック１５の周囲に拘束部材３０が設けられる。なお、絶縁フィルムＦは、拘束部材３０に求められる強度が得られるまで、電池スタック１５の周囲に複数回巻き付けられる。 Next, the step of providing the restraint member 30 around the battery stack 15 will be described with reference to FIG. As shown in FIG. 2, in a state in which the battery stack 15 is placed on the turntable T, the insulating film F is wound from the film roll R around which the insulating film F forming the restraint member 30 is wound, By rotating the table T, the insulating film F is wrapped around the battery stack 15. Then, the terminal end portion of the insulating film F is fused to the insulating film F wrapped around the battery stack 15, so that the restraint member 30 is provided around the battery stack 15. The insulating film F is wound around the battery stack 15 a plurality of times until the strength required of the restraint member 30 is obtained.

以上に説明したように、本実施形態の電池パック１では、電池スタック１５（複数の二次電池１０および一対のエンドプレート２０）を拘束する拘束部材３０が、電池スタック１５の周囲に巻き付けられた絶縁フィルムＦからなるため、二次電池１０と拘束部材３０との短絡が抑制される。 As described above, in the battery pack 1 of the present embodiment, the restraint member 30 that restrains the battery stack 15 (the plurality of secondary batteries 10 and the pair of end plates 20) is wound around the battery stack 15. Since the insulating film F is used, a short circuit between the secondary battery 10 and the restraint member 30 is suppressed.

また、各エンドプレート２０の角部２２は、湾曲しているため、拘束部材３０のうち当該角部２２を被覆する部位への応力集中の発生が抑制される。 In addition, since the corner portion 22 of each end plate 20 is curved, the occurrence of stress concentration on the portion of the restraint member 30 that covers the corner portion 22 is suppressed.

なお、今回開示された実施形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 It should be understood that the embodiments disclosed this time are exemplifications in all respects and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

例えば、電池パック１は、図３〜図７に示される以下の各変形例のように構成されてもよい。図３は、図１に示される電池パックの第１変形例を概略的に示す斜視図である。図４は、図１に示される電池パックの第２変形例を概略的に示す斜視図である。図５は、図１に示される電池パックの第３変形例を概略的に示す平面図である。図６は、図５に示される電池パックの拘束部材の構成を概略的に示す図である。図７は、図１に示される電池パックの第４変形例を概略的に示す斜視図である。図８は、図７におけるＶＩＩＩ−ＶＩＩＩ線での断面図である。 For example, the battery pack 1 may be configured as in the following modified examples shown in FIGS. 3 to 7. FIG. 3 is a perspective view schematically showing a first modified example of the battery pack shown in FIG. FIG. 4 is a perspective view schematically showing a second modified example of the battery pack shown in FIG. FIG. 5 is a plan view schematically showing a third modified example of the battery pack shown in FIG. FIG. 6 is a diagram schematically showing a configuration of a restraint member of the battery pack shown in FIG. FIG. 7 is a perspective view schematically showing a fourth modified example of the battery pack shown in FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7.

（第１変形例）
図３に示される例では、電池パック１は、複数の二次電池１０と拘束部材３０との間に配置された熱伝導シート４０をさらに備えている。熱伝導シート４０は、拘束部材３０の熱伝導率よりも高い熱伝導率を有している。熱伝導シート４０は、各二次電池１０の容器１１の側面に接触している。熱伝導シート４０として、例えば、グラファイトシートが挙げられる。 (First modification)
In the example shown in FIG. 3, the battery pack 1 further includes a heat conductive sheet 40 arranged between the plurality of secondary batteries 10 and the restraining member 30. The thermal conductive sheet 40 has a thermal conductivity higher than that of the restraining member 30. The heat conductive sheet 40 is in contact with the side surface of the container 11 of each secondary battery 10. Examples of the heat conductive sheet 40 include a graphite sheet.

この態様では、一方向に沿って各二次電池１０間で熱が伝導されるため、各二次電池１０間の温度のバラツキが抑制される。また、いずれかの二次電池１０が熱暴走した場合、その二次電池１０で生じた熱が他の二次電池１０に向かって拡散するため、熱暴走した二次電池１０が冷却される。よって、熱暴走した二次電池１０に隣接する二次電池１０での熱暴走の発生（いわゆる連鎖発煙）が抑制される。 In this aspect, since heat is conducted between the secondary batteries 10 along one direction, variations in temperature between the secondary batteries 10 are suppressed. Further, when any one of the secondary batteries 10 undergoes thermal runaway, the heat generated in the secondary battery 10 diffuses toward the other secondary battery 10, so that the thermally runaway secondary battery 10 is cooled. Therefore, the occurrence of thermal runaway (so-called chain smoking) in the secondary battery 10 adjacent to the secondary battery 10 that has undergone thermal runaway is suppressed.

（第２変形例）
図４に示される例では、電池パック１は、拘束部材３０に保持された冷却器５０をさらに備えている。冷却器５０は、電池スタック１５への絶縁フィルムＦの巻き付け途中に絶縁フィルムＦ間に配置される。これにより、冷却器５０は、絶縁フィルムＦの張力により保持され、かつ、各二次電池１０の容器１１の側面に押し付けられる。 (Second modified example)
In the example shown in FIG. 4, the battery pack 1 further includes a cooler 50 held by the restraint member 30. The cooler 50 is arranged between the insulating films F while the insulating film F is being wound around the battery stack 15. Thereby, the cooler 50 is held by the tension of the insulating film F and pressed against the side surface of the container 11 of each secondary battery 10.

この態様では、冷却器５０によって各二次電池１０が有効に冷却される。 In this mode, each rechargeable battery 10 is effectively cooled by the cooler 50.

（第３変形例）
図５に示される例では、拘束部材３０は、各二次電池１０間に配置される介在部３２と、各二次電池１０の容器１１の側面に接するように配置される側面部３４と、を有している。この例の拘束部材３０は、絶縁フィルムＦが各二次電池１０間につづら折り状（ジグザグ状）となるように配置され、その後、電池スタック１５の周囲に絶縁フィルムＦが巻き付けられることにより形成される。この態様では、介在部３２によって二次電池１０間が絶縁されるため、スペーサを省略することが可能となる。 (Third modification)
In the example shown in FIG. 5, the restraint member 30 includes an interposition part 32 arranged between the secondary batteries 10 and a side surface part 34 arranged so as to be in contact with the side surface of the container 11 of each secondary battery 10. have. The restraint member 30 of this example is formed by arranging the insulating film F in a zigzag shape between the secondary batteries 10, and then winding the insulating film F around the battery stack 15. It In this aspect, since the intermediary portion 32 insulates the secondary batteries 10 from each other, the spacer can be omitted.

この場合において、図６に示されるように、絶縁フィルムＦのうち介在部３２を形成する部位（各二次電池１０間に配置される部位）に、断熱材３６が接続されてもよい。断熱材３６としては、エアロシリカゲルを含有するシートが挙げられる。 In this case, as shown in FIG. 6, the heat insulating material 36 may be connected to a portion of the insulating film F forming the interposition portion 32 (a portion disposed between the secondary batteries 10). Examples of the heat insulating material 36 include a sheet containing aerosilica gel.

（第４変形例）
図７および図８に示される例では、各エンドプレート２０に、治具６０を挿通するための挿通孔２０ｈが設けられている。治具６０は、一対のエンドプレート２０の各挿通孔２０ｈに挿通された状態において、一対のエンドプレート２０に対し、一対のエンドプレート２０が互いに近づく方向の力を付与する。治具６０は、絶縁材料により形成されてもよい。なお、図７では、治具６０の図示は省略されている。 (Fourth modification)
In the example shown in FIGS. 7 and 8, each end plate 20 is provided with an insertion hole 20h through which the jig 60 is inserted. The jig 60 applies a force to the pair of end plates 20 in a direction in which the pair of end plates 20 approach each other in a state where the jig 60 is inserted into each of the insertion holes 20h of the pair of end plates 20. The jig 60 may be formed of an insulating material. Note that the jig 60 is not shown in FIG. 7.

この態様では、電池スタック１５に一対のエンドプレート２０が互いに近づく方向の力を与圧を付与しながら当該電池スタック１５の周囲に絶縁フィルムＦを巻き付けることが可能となる。 In this mode, it becomes possible to wind the insulating film F around the battery stack 15 while applying a force to the battery stack 15 in the direction in which the pair of end plates 20 approach each other.

１ 電池パック、１０ 二次電池、１１ 容器、１２ 正極端子、１３ 負極端子、１５ 電池スタック、２０ エンドプレート、２０ｈ 挿通孔、２２ 角部、３０ 拘束部材、３１ 融着部、３２ 介在部、３６ 断熱材、４０ 熱伝導シート、５０ 冷却器、６０ 治具、Ｆ 絶縁フィルム、Ｒ フィルムロール、Ｔ ターンテーブル。 DESCRIPTION OF SYMBOLS 1 battery pack, 10 secondary battery, 11 container, 12 positive electrode terminal, 13 negative electrode terminal, 15 battery stack, 20 end plate, 20h insertion hole, 22 corner part, 30 restraining member, 31 fusion bonding part, 32 interposition part, 36 Heat insulating material, 40 heat conductive sheet, 50 cooler, 60 jig, F insulating film, R film roll, T turntable.

Claims (1)

一方向に並ぶように配置された複数の二次電池と、
前記一方向における前記複数の二次電池の両端に配置された一対のエンドプレートと、
前記複数の二次電池および前記一対のエンドプレートを拘束する拘束部材と、を備え、
前記拘束部材は、前記複数の二次電池および前記一対のエンドプレートの周囲に巻き付けられた絶縁フィルムからなる、電池パック。 A plurality of secondary batteries arranged to line up in one direction,
A pair of end plates arranged at both ends of the plurality of secondary batteries in the one direction,
A restraining member for restraining the plurality of secondary batteries and the pair of end plates,
The battery pack, wherein the restraint member includes an insulating film wrapped around the plurality of secondary batteries and the pair of end plates.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008059966A1 (en) * 2008-12-02 2010-06-10 Daimler Ag Battery for use in motor vehicle e.g. hybrid vehicle, has cell group and cooling plate pressed against each other by tensioning elements i.e. tensioning belts, which comprise tension spring and elastic element
DE102012012006A1 (en) * 2012-06-16 2013-12-19 Daimler Ag Method for bracing individual cells of battery pack with each other, involves placing resilient winding element in circumferential direction around stacked individual components in accordance with predetermined bias force
DE102014204737A1 (en) * 2014-03-14 2015-09-17 Bayerische Motoren Werke Aktiengesellschaft Cell module for high-voltage storage of a motor vehicle
US20180269518A1 (en) * 2017-03-17 2018-09-20 Ford Global Technologies, Llc Battery cell compression method and assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008059966A1 (en) * 2008-12-02 2010-06-10 Daimler Ag Battery for use in motor vehicle e.g. hybrid vehicle, has cell group and cooling plate pressed against each other by tensioning elements i.e. tensioning belts, which comprise tension spring and elastic element
DE102012012006A1 (en) * 2012-06-16 2013-12-19 Daimler Ag Method for bracing individual cells of battery pack with each other, involves placing resilient winding element in circumferential direction around stacked individual components in accordance with predetermined bias force
DE102014204737A1 (en) * 2014-03-14 2015-09-17 Bayerische Motoren Werke Aktiengesellschaft Cell module for high-voltage storage of a motor vehicle
US20180269518A1 (en) * 2017-03-17 2018-09-20 Ford Global Technologies, Llc Battery cell compression method and assembly

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