JP2016152108A - Battery pack - Google Patents

Battery pack Download PDF

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JP2016152108A
JP2016152108A JP2015028398A JP2015028398A JP2016152108A JP 2016152108 A JP2016152108 A JP 2016152108A JP 2015028398 A JP2015028398 A JP 2015028398A JP 2015028398 A JP2015028398 A JP 2015028398A JP 2016152108 A JP2016152108 A JP 2016152108A
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hole
housing
battery pack
additional weight
screw
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JP6492734B2 (en
Inventor
和樹 前田
Kazuki Maeda
和樹 前田
加藤 崇行
Takayuki Kato
崇行 加藤
浩生 植田
Hiromi Ueda
浩生 植田
直人 守作
Naoto Morisaku
直人 守作
英史 大石
Eiji Oishi
英史 大石
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Toyota Industries Corp
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Toyota Industries Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Electric Double-Layer Capacitors Or The Like (AREA)
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Abstract

PROBLEM TO BE SOLVED: To propose a battery pack which simplifies the manufacturing process when a housing interior member and a housing exterior member are fixed to the same wall part of the housing.SOLUTION: A battery pack houses a battery module in a housing. Through holes 38 are formed so as to penetrate through a wall part (a side plate 37) of the housing. Fixing members (for example screw members 51, 52), which are provided to fit in the through holes 38, fix a housing interior member (for example, a bracket 25 for fixing the battery module to the wall part) disposed at the inner side of the housing and a housing exterior member (for example, an additional weight member 40) disposed at the outer side of the housing to the wall part.SELECTED DRAWING: Figure 4

Description

本発明は、電池パックに関する。   The present invention relates to a battery pack.

電池パックは、例えば、特許文献1に開示されているように筐体内に複数の電池モジュールを収容することによって構成される。この電池モジュールは、一対のブラケットを用いて筐体の壁部の内壁面にボルトで固定されている。このボルトでの固定のために、壁部の内壁面には非貫通のネジ孔(袋ネジ)が形成されている。   A battery pack is comprised by accommodating a some battery module in a housing | casing as disclosed by patent document 1, for example. This battery module is fixed to the inner wall surface of the wall portion of the housing with a bolt using a pair of brackets. For fixing with the bolt, a non-penetrating screw hole (cap screw) is formed in the inner wall surface of the wall portion.

特開2014−120340号公報JP, 2014-120340, A

特許文献1に開示の電池パックは、フォークリフトなどの産業車両のカウンタウエイトとして機能しており、追加のウエイト部材が筐体の壁部の外壁面にボルトで固定されている。ウエイト部材などの筐体外部材をボルトで固定する場合、壁部の外壁面にも非貫通のネジ孔が必要となる。非貫通のネジ孔を壁部に形成するためには、壁部を構成する部品の一つ一つにそれぞれ加工が必要となる。そのため、壁部の内側及び外側に非貫通のネジ孔を形成すると、電池パックの製造工程が非常に煩雑化する。   The battery pack disclosed in Patent Document 1 functions as a counterweight of an industrial vehicle such as a forklift, and an additional weight member is fixed to the outer wall surface of the wall portion of the housing with a bolt. When fixing a casing outer member such as a weight member with a bolt, a non-penetrating screw hole is also required on the outer wall surface of the wall portion. In order to form a non-penetrating screw hole in the wall portion, it is necessary to process each of the parts constituting the wall portion. Therefore, if non-penetrating screw holes are formed inside and outside the wall, the battery pack manufacturing process becomes very complicated.

そこで、本発明においては、筐体の同じ壁部に筐体内部材及び筐体外部材を固定する場合の製造工程を簡単化できる電池パックを提案することを課題とする。   Therefore, an object of the present invention is to propose a battery pack capable of simplifying the manufacturing process in the case where the casing inner member and the casing outer member are fixed to the same wall portion of the casing.

本発明の一側面に係る電池パックは、筐体内に電池モジュールを収納してなる電池パックであって、筐体の壁部を貫通するように貫通孔が形成され、貫通孔に対して設けられた固定部材によって、筐体の内側に配置された筐体内部材と筐体の外側に配置された筐体外部材とが壁部に固定される。   A battery pack according to one aspect of the present invention is a battery pack in which a battery module is housed in a housing, and a through hole is formed so as to penetrate a wall portion of the housing, and is provided to the through hole. By the fixing member, the inner member disposed inside the housing and the outer member disposed outside the housing are fixed to the wall portion.

この電池パックでは、筐体の壁部の貫通孔を筐体内部材と筐体外部材とを固定するための共有孔として利用する。この構成により、電池パックは、壁部に形成する孔の個数を低減できる。また、壁部に貫通孔を形成する際に、例えば、壁部を構成する部材を複数重ねて加工することが可能となる。したがって、この電池パックは、筐体の同じ壁部に筐体内部材及び筐体外部材を固定するために、壁部の内側及び外側にそれぞれ非貫通の孔を形成する場合と比べて、電池パックの製造工程を簡単化できる。   In this battery pack, the through hole in the wall portion of the casing is used as a common hole for fixing the casing inner member and the casing outer member. With this configuration, the battery pack can reduce the number of holes formed in the wall portion. Moreover, when forming a through-hole in a wall part, for example, it becomes possible to process a plurality of members constituting the wall part. Therefore, in order to fix the casing inner member and the casing outer member to the same wall portion of the casing, this battery pack has a battery pack in which the non-through holes are formed on the inner side and the outer side of the wall portion, respectively. The manufacturing process can be simplified.

一実施形態の電池パックでは、筐体内部材が電池モジュールを壁部に固定するための部材である。この場合、電池パックでは、貫通孔を利用して電池モジュールが筐体内部材を介して壁部の内側に固定される。   In the battery pack according to one embodiment, the member in the housing is a member for fixing the battery module to the wall portion. In this case, in the battery pack, the battery module is fixed to the inside of the wall portion through the member in the casing using the through hole.

一実施形態の電池パックでは、電池パックが産業車両に搭載され、筐体外部材がウエイト部材である。この場合、電池パックでは、貫通孔を利用してウエイト部材が筐体の壁部の外側に固定される。このウエイト部材が熱マスとしても機能するため、電池パックでの放熱性が向上する。   In the battery pack of one embodiment, the battery pack is mounted on an industrial vehicle, and the housing outer member is a weight member. In this case, in the battery pack, the weight member is fixed to the outside of the wall portion of the housing using the through hole. Since this weight member also functions as a heat mass, the heat dissipation in the battery pack is improved.

一実施形態の電池パックでは、壁部と筐体外部材との間にシール部材が設けられる構成としてもよい。この構成により、電池パックは、筐体の壁部に貫通孔が形成されているが、シール部材により筐体の密閉性を向上できる。   In the battery pack of one embodiment, a sealing member may be provided between the wall portion and the housing outer member. With this configuration, the battery pack has a through hole formed in the wall portion of the casing, but the sealing performance of the casing can be improved by the seal member.

一実施形態の電池パックでは、シール部材が熱伝導性を有する構成としてもよい。この構成により、電池パックは、電池モジュールが発した熱が壁部の外側の筐体外部材に伝わり易くなり、放熱性が向上する。   In the battery pack of one embodiment, the sealing member may have a thermal conductivity. With this configuration, in the battery pack, heat generated by the battery module is easily transmitted to the outer member of the casing outside the wall portion, and heat dissipation is improved.

一実施形態の電池パックでは、貫通孔の内壁にネジ溝が形成される構成としてもよい。この構成により、電池パックでは、ネジ溝付きの貫通孔を利用して筐体内部材及び筐体外部材を壁部に強固に固定できる。   In the battery pack of one embodiment, a thread groove may be formed on the inner wall of the through hole. With this configuration, in the battery pack, the casing inner member and the casing outer member can be firmly fixed to the wall portion using a through hole with a thread groove.

一実施形態の電池パックでは、固定部材は、第1のネジ部材と第2のネジ部材であり、筐体の内側から貫通孔の一端側に螺合された第1のネジ部材によって筐体内部材が壁部に固定され、筐体の外側から貫通孔の他端側に螺合された第2のネジ部材によって筐体外部材が筐体の壁部に固定される構成としてもよい。この構成により、電池パックでは、第1のネジ部材とネジ溝付きの貫通孔との螺合により、筐体内部材を壁部の内側に強固に固定できる。また、電池パックでは、第2のネジ部材とネジ溝付きの貫通孔との螺合により、筐体外部材を壁部の外側に強固に固定できる。また、電池パックでは、第1のネジ部材と第2のネジ部材を用いて貫通孔の内側と外側の両側から固定するので、筐体内部材と筐体外部材とを別々に取り付け/取り外しが可能である。   In the battery pack according to the embodiment, the fixing member is a first screw member and a second screw member, and the inner member of the casing by the first screw member screwed into one end side of the through hole from the inner side of the casing. The outer member may be fixed to the wall of the casing by a second screw member that is fixed to the wall and screwed to the other end of the through hole from the outside of the casing. With this configuration, in the battery pack, the member in the housing can be firmly fixed to the inside of the wall portion by screwing the first screw member and the through hole with the thread groove. Further, in the battery pack, the housing outer member can be firmly fixed to the outside of the wall portion by screwing the second screw member and the through hole with a thread groove. Further, in the battery pack, since the first screw member and the second screw member are used to fix from both the inner side and the outer side of the through hole, the inner member and the outer member can be attached / removed separately. is there.

本発明によれば、筐体の同じ壁部に筐体内部材及び筐体外部材を固定する場合の製造工程を簡単化できる。   ADVANTAGE OF THE INVENTION According to this invention, the manufacturing process in the case of fixing a case inner member and a case outer member to the same wall part of a case can be simplified.

本実施形態に係るフォークリフトを示す概略側面図である。It is a schematic side view which shows the forklift which concerns on this embodiment. 第1実施形態に係る電池パックの外観を示す概略斜視図である。It is a schematic perspective view which shows the external appearance of the battery pack which concerns on 1st Embodiment. 図2に示した電池パックの内部を示す概略斜視図である。It is a schematic perspective view which shows the inside of the battery pack shown in FIG. 図2に示した電池パックにおけるブラケット及び追加ウエイト部材と筐体の壁部との固定構造を示す要部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part showing a fixing structure of a bracket and an additional weight member and a wall portion of the housing in the battery pack shown in FIG. 2. 第2実施形態に係る電池パックの外観を示す概略斜視図である。It is a schematic perspective view which shows the external appearance of the battery pack which concerns on 2nd Embodiment. 図5に示した電池パックにおけるブラケット及び追加ウエイト部材と筐体の壁部との固定構造を示す要部拡大断面図である。FIG. 6 is an enlarged cross-sectional view of a main part showing a fixing structure of the bracket and the additional weight member and the wall portion of the housing in the battery pack shown in FIG. 5. ネジ溝がない貫通孔を用いた場合のブラケット及び追加ウエイト部材と筐体の壁部との固定構造の一例を示す断面図である。It is sectional drawing which shows an example of the fixing structure of the bracket and additional weight member, and the wall part of a housing | casing at the time of using the through-hole without a screw groove.

以下、図面を参照して、本発明の実施形態に係る電池パックを説明する。なお、各図において同一又は相当する要素については同一の符号を付し、重複する説明を省略する。   Hereinafter, a battery pack according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

本実施形態では、フォークリフトに搭載される電池パックに適用する。フォークリフトは、荷役作業を行う産業車両である。本実施形態に係る電池パックは、フォークリフトのバッテリーとして機能する。また、本実施形態に係る電池パックは、フォークリフトのカウンタウエイトとしても機能し、カウンタウエイトとしての重さを調整するために筐体の外側に追加のウエイト部材が固定される。   In this embodiment, it applies to the battery pack mounted in a forklift. A forklift is an industrial vehicle that performs a cargo handling operation. The battery pack according to the present embodiment functions as a forklift battery. The battery pack according to the present embodiment also functions as a counterweight of the forklift, and an additional weight member is fixed to the outside of the casing in order to adjust the weight as the counterweight.

図1を参照して、本実施形態に係るフォークリフト1について説明する。図1は、フォークリフト1を示す概略側面図である。図1に示すように、フォークリフト1は、車体2、荷役装置3及び運転室4を主な構成として備えている。荷役装置3は、車体2の前部に配置される。運転室4は、車体2の中央の上部に配置される。   A forklift 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic side view showing a forklift 1. As shown in FIG. 1, the forklift 1 includes a vehicle body 2, a cargo handling device 3, and a cab 4 as main components. The cargo handling device 3 is disposed at the front portion of the vehicle body 2. The driver's cab 4 is disposed at the upper center of the vehicle body 2.

車体2には、前下部に駆動輪2aが設けられ、後下部に操舵輪2bが設けられている。また、車体2には、内部に走行用モータ2cと荷役用モータ2dが搭載されている。走行用モータ2cは、駆動輪2aの駆動源となるモータである。荷役用モータ2dは、荷役装置3のフォーク3aの駆動源となるモータである。また、車体2には、電池パック10が搭載されている。電池パック10は、運転室4の下方に配置されている。電池パック10は、走行用モータ2c及び荷役用モータ2dなどの電力源となる。   The vehicle body 2 is provided with a drive wheel 2a at the front lower part and a steering wheel 2b at the rear lower part. The vehicle body 2 has a traveling motor 2c and a cargo handling motor 2d mounted therein. The travel motor 2c is a motor that is a drive source of the drive wheels 2a. The cargo handling motor 2 d is a motor that is a drive source of the fork 3 a of the cargo handling device 3. A battery pack 10 is mounted on the vehicle body 2. The battery pack 10 is disposed below the cab 4. The battery pack 10 serves as a power source for the traveling motor 2c and the cargo handling motor 2d.

荷役装置3は、左右一対のフォーク3a及びマスト3bを有している。マスト3bは、車体2の前部に立設されている。フォーク3aは、マスト3bにリフトブラケット3cを介して取り付けられている。フォーク3aは、積荷Aを支持するための部材である。フォーク3aは、マスト3bに結合されたリフトシリンダ3dの駆動力により、リフトブラケット3cと共に上下方向に移動可能である。また、フォーク3aは、マスト3bに結合されたティルトシリンダ3eの駆動力により、ティルトシリンダ3eとの結合点を回転中心として前後方向に回動可能である。   The cargo handling device 3 has a pair of left and right forks 3a and a mast 3b. The mast 3 b is erected on the front portion of the vehicle body 2. The fork 3a is attached to the mast 3b via a lift bracket 3c. The fork 3a is a member for supporting the load A. The fork 3a can move in the vertical direction together with the lift bracket 3c by the driving force of the lift cylinder 3d coupled to the mast 3b. Further, the fork 3a can be rotated in the front-rear direction around the coupling point with the tilt cylinder 3e by the driving force of the tilt cylinder 3e coupled to the mast 3b.

運転室4には、運転者(図示せず)が着座可能な運転シート4aが設けられている。また、運転室4には、運転シート4aの前方にハンドル4bが設けられている。   The cab 4 is provided with a driving seat 4a on which a driver (not shown) can be seated. In the cab 4, a handle 4b is provided in front of the driving seat 4a.

電池パック10(追加ウエイト部材40を含む)は、フォーク3aにより支持される積荷Aの重量と釣り合いをとるためのカウンタウエイトとして機能する。換言すれば、フォークリフト1は、電池パック10をカウンタウエイトとして備えている。追加ウエイト部材40の重量は、電池モジュール20などを収容した筐体30の重量とフォークリフト1における積荷Aの許容最大荷重に応じて決められる。   The battery pack 10 (including the additional weight member 40) functions as a counterweight for balancing the weight of the load A supported by the fork 3a. In other words, the forklift 1 includes the battery pack 10 as a counterweight. The weight of the additional weight member 40 is determined according to the weight of the housing 30 that houses the battery module 20 and the like and the allowable maximum load of the load A on the forklift 1.

図2及び図3を参照して、第1実施形態に係る電池パック10Aについて説明する。図2は、電池パック10Aの外観を示す概略斜視図である。図3は、電池パック10Aの内部を示す概略斜視図である。図2は電池パック10Aを追加ウエイト部材40側から見た斜視図であり、図3は電池パック10Aを追加ウエイト部材40の反対側から見た斜視図である。図3では、電池パック10A(筐体30)の内部の電池モジュール20及びその固定用の部材のみを図示しており、配線用の部材及び制御機器などの他の部材を省略している。   The battery pack 10A according to the first embodiment will be described with reference to FIGS. FIG. 2 is a schematic perspective view showing the external appearance of the battery pack 10A. FIG. 3 is a schematic perspective view showing the inside of the battery pack 10A. 2 is a perspective view of the battery pack 10A as viewed from the side of the additional weight member 40, and FIG. 3 is a perspective view of the battery pack 10A as viewed from the opposite side of the additional weight member 40. In FIG. 3, only the battery module 20 inside the battery pack 10 </ b> A (housing 30) and a member for fixing the battery module 20 are illustrated, and other members such as a wiring member and a control device are omitted.

電池パック10Aは、電池モジュール20を筐体30内に収容している。電池パック10Aは、上述したようにフォークリフト1のバッテリーとして機能するとともにカウンタウエイトとして機能する。電池パック10Aは、筐体30を構成する一つの壁部の内側に電池モジュール20が固定され、同じ壁部の外側に追加ウエイト部材40(筐体外部材)が固定される。この筐体30の壁部への固定では、壁部を貫通する貫通孔を電池モジュール20と追加ウエイト部材40とで共通孔として利用する。   The battery pack 10 </ b> A houses the battery module 20 in a housing 30. As described above, the battery pack 10A functions as a battery of the forklift 1 and also functions as a counterweight. In the battery pack 10 </ b> A, the battery module 20 is fixed to the inside of one wall portion constituting the housing 30, and the additional weight member 40 (outside housing member) is fixed to the outside of the same wall portion. In fixing the housing 30 to the wall portion, the through hole penetrating the wall portion is used as a common hole in the battery module 20 and the additional weight member 40.

なお、図3に示す例では、筐体30内に電池モジュール20を4個収容し、上下方向に2段に配置されるとともに左右方向に2列並べられたものを示している。これは一例であり、電池モジュール20の個数については1個以上の個数が適宜決められ、電池モジュール20の配置についても筐体30の形状などに応じて適宜決められる。但し、電池パックの仕様により、筐体30内に収容可能な個数よりも少ない個数の電池モジュール20が収容される場合がある。従来の電池パックでは、収納可能な個数よりも電池モジュールの個数が少ない場合、筐体内の空いている箇所にダミーモジュールを設けることによりカウンタウエイトとしての重量調整を行っていた。一方、本実施形態に係る電池パック10では、追加ウエイト部材40によってカウンタウエイトとしての重量調整が行われる。   In the example shown in FIG. 3, four battery modules 20 are accommodated in the housing 30, arranged in two stages in the vertical direction and arranged in two rows in the horizontal direction. This is an example, and the number of battery modules 20 is appropriately determined as one or more, and the arrangement of the battery modules 20 is also determined appropriately according to the shape of the housing 30 and the like. However, depending on the specifications of the battery pack, a smaller number of battery modules 20 than the number that can be accommodated in the housing 30 may be accommodated. In the conventional battery pack, when the number of battery modules is smaller than the number that can be stored, weight adjustment as a counterweight is performed by providing a dummy module in an empty space in the housing. On the other hand, in the battery pack 10 according to the present embodiment, weight adjustment as a counterweight is performed by the additional weight member 40.

電池モジュール20について説明する。電池モジュール20は、複数(図3に示す例では7個)の電池セル21を互いに電気的に接続することによって構成されている。電池セル21は、電池ホルダ22によって保持されている。複数の電池セル21は、電池ホルダ22に保持された状態で一方向に並べられている。   The battery module 20 will be described. The battery module 20 is configured by electrically connecting a plurality (seven in the example shown in FIG. 3) battery cells 21 to each other. The battery cell 21 is held by a battery holder 22. The plurality of battery cells 21 are arranged in one direction while being held by the battery holder 22.

電池セル21は、リチウムイオン二次電池などの非水電解質二次電池といった蓄電池、あるいは電気二重層キャパシタなどである。電池セル21は、例えば、ケース内に電解液と電極組立体を収容してなる。電極組立体は、正極、負極及び正極と負極とを絶縁するセパレータを複数有している。この複数の正極、負極及びセパレータは、正極と負極との間にセパレータを挟んだ状態で積層されている。   The battery cell 21 is a storage battery such as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The battery cell 21 includes, for example, an electrolytic solution and an electrode assembly in a case. The electrode assembly has a plurality of separators that insulate the positive electrode, the negative electrode, and the positive electrode and the negative electrode. The plurality of positive electrodes, negative electrodes, and separators are stacked with the separators sandwiched between the positive electrodes and the negative electrodes.

電池セル21は、正極端子と負極端子を有している。複数の電池セル21は、極性が異なる端子が隣り合うように配列されている。複数の電池セル21は、バスバー23によって電気的に直列に接続されている。電池セル21と電池セル21との間には、伝熱プレート(図示せず)が配置されている。伝熱プレートは、例えば、断面が略L字の平板状の部材であり、一方の平板部が電池セル21と電池セル21との間に配置され、他方の平板部が筐体30の壁部に接するように配置される。電池セル21の並び方向の両端には、エンドプレート24,24が設けられている。複数の電池セル21は、一対のエンドプレート24,24に挟み込まれた状態で拘束され、拘束荷重が付加されている。エンドプレート24の外側面24aには、ブラケット25が取り付けられている。電池モジュール20は、一対のブラケット25(筐体内部材)により筐体30の一つの壁部に固定されている。   The battery cell 21 has a positive electrode terminal and a negative electrode terminal. The plurality of battery cells 21 are arranged so that terminals having different polarities are adjacent to each other. The plurality of battery cells 21 are electrically connected in series by a bus bar 23. A heat transfer plate (not shown) is disposed between the battery cells 21. The heat transfer plate is, for example, a flat plate member having a substantially L-shaped cross section, one flat plate portion is disposed between the battery cells 21, and the other flat plate portion is a wall portion of the housing 30. It arrange | positions so that it may touch. End plates 24 and 24 are provided at both ends of the battery cells 21 in the arrangement direction. The plurality of battery cells 21 are restrained while being sandwiched between the pair of end plates 24, 24, and a restraining load is applied thereto. A bracket 25 is attached to the outer surface 24 a of the end plate 24. The battery module 20 is fixed to one wall portion of the housing 30 by a pair of brackets 25 (internal housing members).

筐体30について説明する。筐体30は、箱状であり、例えば、図3に示す略直方体形状である。筐体30は、本体31と、天板32と、蓋部材33とを有する。筐体30を形成する材料としては、例えば、鉄などの金属材料である。筐体30の内部は、電池モジュール20、配線用の部材(図示せず)、制御機器(図示せず)などが収容される収容空間Sとなっている。筐体30は、内部から気体、液体が外部に漏れないように密閉されている。   The housing 30 will be described. The housing | casing 30 is box shape, for example, is a substantially rectangular parallelepiped shape shown in FIG. The housing 30 includes a main body 31, a top plate 32, and a lid member 33. As a material for forming the housing 30, for example, a metal material such as iron is used. Inside the housing 30 is a housing space S in which the battery module 20, a wiring member (not shown), a control device (not shown), and the like are housed. The housing 30 is sealed so that gas and liquid do not leak from the inside.

本体31は、底板34と、側板35,36,37とからなる。底板34は、所定の厚みを有する矩形の平板状である。側板35は、底板34の一方の短辺の縁部に立設されている。側板36は、底板34の他方の短辺の縁部に立設されている。側板35と側板36とは、同じ形状であり、所定の厚みを有する矩形の平板状である。側板37は、底板34の一方の長辺の縁部に立設されている。側板37は、所定の厚みを有する矩形の平板状である。底板34の各縁部と側板35,36,37の縁部とは、溶接などによってそれぞれ接合されている。また、側板37の各縁部と側板35,36の縁部とは、溶接などによってそれぞれ接合されている。   The main body 31 includes a bottom plate 34 and side plates 35, 36 and 37. The bottom plate 34 is a rectangular flat plate having a predetermined thickness. The side plate 35 is erected on the edge of one short side of the bottom plate 34. The side plate 36 is erected on the edge of the other short side of the bottom plate 34. The side plate 35 and the side plate 36 have the same shape and are rectangular flat plates having a predetermined thickness. The side plate 37 is erected on the edge of one long side of the bottom plate 34. The side plate 37 is a rectangular flat plate having a predetermined thickness. The edges of the bottom plate 34 and the edges of the side plates 35, 36, 37 are joined by welding or the like. Moreover, each edge part of the side plate 37 and the edge part of the side plates 35 and 36 are each joined by welding etc.

天板32は、本体31の側板35,36,37で形成される上部の開口部分を塞ぐ部材である。天板32は、所定の厚みを有する矩形の平板状である。天板32の各縁部は、ボルトなどの締結部材によって側板35,36,37の縁部にそれぞれ固定されている。蓋部材33は、本体31の底板34と側板35,36及び天板32で形成される開口部分を塞ぐ部材である。蓋部材33は、所定の厚みを有する矩形の平板状である。蓋部材33の各縁部は、ボルトなどの締結部材によって底板34、側板35,36及び天板32の縁部にそれぞれ固定されている。   The top plate 32 is a member that closes the upper opening formed by the side plates 35, 36, and 37 of the main body 31. The top plate 32 is a rectangular flat plate having a predetermined thickness. Each edge of the top plate 32 is fixed to the edge of the side plates 35, 36, 37 by fastening members such as bolts. The lid member 33 is a member that closes an opening formed by the bottom plate 34, the side plates 35 and 36, and the top plate 32 of the main body 31. The lid member 33 is a rectangular flat plate having a predetermined thickness. Each edge of the lid member 33 is fixed to the edge of the bottom plate 34, the side plates 35, 36 and the top plate 32 by fastening members such as bolts.

追加ウエイト部材40について説明する。追加ウエイト部材40は、カウンタウエイトとして機能する電池パック10Aの重量調整用の部材である。追加ウエイト部材40は、所定の厚みを有する矩形の平板状である。追加ウエイト部材40は、筐体30を構成する一つの壁部(主に側板37からなる壁部)全面の形状と略同じ矩形状である。追加ウエイト部材40は、この筐体30の一つの壁部に固定されている。この追加ウエイト部材40が固定される壁部は、一対のブラケット25,25を用いて電池モジュール20が固定される壁部と同じ壁部である。追加ウエイト部材40を形成する材料としては、例えば、鉄などの金属材料である。追加ウエイト部材40の厚みは、追加ウエイト部材40を形成する材料の密度と重量調整用として必要な重量に応じて適宜決められる。例えば、筐体30内に収納可能な個数よりも電池モジュールの個数が少ない場合、追加ウエイト部材40の厚みを厚くして、カウンタウエイトとして必要な重量を確保する。   The additional weight member 40 will be described. The additional weight member 40 is a member for adjusting the weight of the battery pack 10A that functions as a counterweight. The additional weight member 40 is a rectangular flat plate having a predetermined thickness. The additional weight member 40 has a rectangular shape that is substantially the same as the shape of the entire surface of one wall portion (a wall portion mainly composed of the side plates 37) constituting the housing 30. The additional weight member 40 is fixed to one wall portion of the housing 30. The wall portion to which the additional weight member 40 is fixed is the same wall portion as the wall portion to which the battery module 20 is fixed using the pair of brackets 25, 25. As a material for forming the additional weight member 40, for example, a metal material such as iron is used. The thickness of the additional weight member 40 is appropriately determined according to the density of the material forming the additional weight member 40 and the weight necessary for weight adjustment. For example, when the number of battery modules is smaller than the number that can be stored in the housing 30, the thickness of the additional weight member 40 is increased to secure a necessary weight as a counterweight.

図4を参照して、ブラケット25及び追加ウエイト部材40と筐体30の壁部(側板37)との固定構造について説明する。図4は、電池パック10Aにおけるブラケット25及び追加ウエイト部材40と筐体30の壁部との固定構造を示す要部拡大断面図である。   With reference to FIG. 4, the fixing structure of the bracket 25, the additional weight member 40, and the wall part (side plate 37) of the housing | casing 30 is demonstrated. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of the bracket 25 and the additional weight member 40 and the wall portion of the housing 30 in the battery pack 10A.

筐体30の側板37には、ネジ溝付きの貫通孔38が形成されている。貫通孔38は、側板37の内壁面37aから外壁面37bに至るように側板37の厚さ方向に貫通して形成されている。貫通孔38の内壁には、内壁面37a側の端部から外壁面37b側の端部までの全体にわたってネジ溝38aが形成されている。また、追加ウエイト部材40には、貫通孔41が形成されている。貫通孔41は、追加ウエイト部材40の内壁面40aから外壁面40bに至るように追加ウエイト部材40の厚さ方向に貫通して形成されている。貫通孔41は、側板37のネジ溝38a付きの貫通孔38の内径と略同径又は僅かに大きい内径を有する。また、エンドプレート24には、ネジ孔26が形成されている。   A through hole 38 with a thread groove is formed in the side plate 37 of the housing 30. The through hole 38 is formed so as to penetrate in the thickness direction of the side plate 37 so as to reach the outer wall surface 37 b from the inner wall surface 37 a of the side plate 37. A thread groove 38a is formed on the inner wall of the through hole 38 from the end on the inner wall surface 37a side to the end on the outer wall surface 37b side. Further, a through hole 41 is formed in the additional weight member 40. The through hole 41 is formed so as to penetrate in the thickness direction of the additional weight member 40 so as to extend from the inner wall surface 40a of the additional weight member 40 to the outer wall surface 40b. The through hole 41 has an inner diameter substantially the same as or slightly larger than the inner diameter of the through hole 38 with the screw groove 38 a of the side plate 37. A screw hole 26 is formed in the end plate 24.

ブラケット25は、エンドプレート24(電池モジュール20)を側板37に固定するための部材である。ブラケット25は、例えば、鉄などの金属材料により断面が略L字の平板状に形成されている。ブラケット25は、第1の平板部27と、第1の平板部27の一縁部において当該第1の平板部27に直交するように形成された第2の平板部28とを有している。第1の平板部27は、エンドプレート24側に固定される部材である。第1の平板部27には、貫通孔27aが形成されている。貫通孔27aは、エンドプレート24のネジ孔26の内径と略同径又は僅かに大きい内径を有する。第2の平板部28は、側板37側に固定される部材である。第2の平板部28には、貫通孔28aが形成されている。貫通孔28aは、側板37のネジ溝38a付きの貫通孔38の内径と略同径又は僅かに大きい内径を有する。   The bracket 25 is a member for fixing the end plate 24 (battery module 20) to the side plate 37. The bracket 25 is formed in a flat plate shape having a substantially L-shaped section, for example, by a metal material such as iron. The bracket 25 has a first flat plate portion 27 and a second flat plate portion 28 formed so as to be orthogonal to the first flat plate portion 27 at one edge portion of the first flat plate portion 27. . The first flat plate portion 27 is a member fixed to the end plate 24 side. A through hole 27 a is formed in the first flat plate portion 27. The through hole 27 a has an inner diameter that is substantially the same as or slightly larger than the inner diameter of the screw hole 26 of the end plate 24. The second flat plate portion 28 is a member fixed to the side plate 37 side. A through hole 28 a is formed in the second flat plate portion 28. The through hole 28 a has an inner diameter substantially the same as or slightly larger than the inner diameter of the through hole 38 with the screw groove 38 a of the side plate 37.

第1の平板部27に形成される貫通孔27aの個数は、1個以上であり、例えば、図3に示す例では2個である。第2の平板部28に形成される貫通孔28aの個数は、1個以上であり、例えば、図3に示す例では2個である。側板37に形成される貫通孔38の個数は、エンドプレート24の個数と第2の平板部28に形成される貫通孔28aの個数によって決まり、例えば、図3に示す例では8(エンドプレート24の個数)×2(第2の平板部28に形成される貫通孔28aの個数)=16個である。側板37に形成される各貫通孔38の位置は、側板37に対して各ブラケット25の第2の平板部28の貫通孔28aが配置される位置に対応した位置である。追加ウエイト部材40に形成される貫通孔41の個数は、側板37に形成される貫通孔38の個数と同じ個数である。追加ウエイト部材40に形成される各貫通孔41の位置は、側板37に形成される各貫通孔38の位置に対応した位置である。   The number of through holes 27a formed in the first flat plate portion 27 is one or more, for example, two in the example shown in FIG. The number of through holes 28a formed in the second flat plate portion 28 is one or more, for example, two in the example shown in FIG. The number of through holes 38 formed in the side plate 37 is determined by the number of end plates 24 and the number of through holes 28a formed in the second flat plate portion 28. For example, in the example shown in FIG. ) × 2 (the number of through holes 28a formed in the second flat plate portion 28) = 16. The position of each through hole 38 formed in the side plate 37 is a position corresponding to the position where the through hole 28 a of the second flat plate portion 28 of each bracket 25 is disposed with respect to the side plate 37. The number of through holes 41 formed in the additional weight member 40 is the same as the number of through holes 38 formed in the side plate 37. The position of each through hole 41 formed in the additional weight member 40 is a position corresponding to the position of each through hole 38 formed in the side plate 37.

ブラケット25は、貫通孔27aとエンドプレート24のネジ孔26とを位置合わせしかつ貫通孔28aと側板37の貫通孔38とを位置合わせした状態で、第1の平板部27がエンドプレート24の外側面24aに沿うとともに第2の平板部28が側板37の内壁面37aに沿うようにして配置されている。そして、エンドプレート24に形成されているネジ孔26毎に、ネジ部材50が、貫通孔27aに通されて、ネジ孔26に螺合されている。また、側板37に形成されている貫通孔38毎に、ネジ部材51(第1のネジ部材(固定部材))が、貫通孔28aに通されて、貫通孔38のネジ溝38aに螺合されている。これにより、ブラケット25が、エンドプレート24と側板37とに強固に固定される。そして、電池モジュール20が、一対のブラケット25により側板37の内壁面37aに強固に固定される。   The bracket 25 has the first flat plate portion 27 of the end plate 24 in a state where the through hole 27a and the screw hole 26 of the end plate 24 are aligned and the through hole 28a and the through hole 38 of the side plate 37 are aligned. The second flat plate portion 28 is arranged along the outer side surface 24 a and along the inner wall surface 37 a of the side plate 37. For each screw hole 26 formed in the end plate 24, the screw member 50 is passed through the through hole 27 a and screwed into the screw hole 26. Further, for each through hole 38 formed in the side plate 37, a screw member 51 (first screw member (fixing member)) is passed through the through hole 28 a and screwed into the screw groove 38 a of the through hole 38. ing. Thereby, the bracket 25 is firmly fixed to the end plate 24 and the side plate 37. The battery module 20 is firmly fixed to the inner wall surface 37 a of the side plate 37 by the pair of brackets 25.

追加ウエイト部材40は、貫通孔41と側板37の貫通孔38とをそれぞれ位置合わせした状態で、内壁面40aが側板37の外壁面37bに沿うようにして配置されている。そして、追加ウエイト部材40に形成されている貫通孔41毎に、ネジ部材52(第2のネジ部材(固定部材))が、貫通孔41に通されて、貫通孔38のネジ溝38aに螺合されている。これにより、追加ウエイト部材40が、側板37の外壁面37bに強固に固定される。   The additional weight member 40 is disposed such that the inner wall surface 40 a is along the outer wall surface 37 b of the side plate 37 in a state where the through hole 41 and the through hole 38 of the side plate 37 are aligned. Then, for each through hole 41 formed in the additional weight member 40, a screw member 52 (second screw member (fixing member)) is passed through the through hole 41 and screwed into the screw groove 38 a of the through hole 38. Are combined. Thereby, the additional weight member 40 is firmly fixed to the outer wall surface 37 b of the side plate 37.

ネジ部材50,51,52は、例えば、六角ボルトである。ネジ部材50,51,52は、軸部にシールための処理が施されたシールボルトでもよい。ネジ部材51とネジ部材52とは同じ貫通孔38のネジ溝38aに螺合されるので、ネジ部材51の軸部51aの外径とネジ部材52の軸部52aの外径とは、略同径(貫通孔38の内径と略同径)である。   The screw members 50, 51, 52 are, for example, hexagon bolts. The screw members 50, 51, 52 may be seal bolts in which processing for sealing is performed on the shaft portion. Since the screw member 51 and the screw member 52 are screwed into the screw groove 38a of the same through hole 38, the outer diameter of the shaft portion 51a of the screw member 51 and the outer diameter of the shaft portion 52a of the screw member 52 are substantially the same. It is a diameter (substantially the same diameter as the inner diameter of the through hole 38).

ネジ部材51の軸部51aは、貫通孔28aを通って貫通孔38の一端側(内壁面37a側)でネジ溝38aに螺合されている。その軸部51aの先端面51bは、貫通孔38の中間部分に位置している。一方、ネジ部材52の軸部52aは、貫通孔41を通って貫通孔38の他端側(外壁面37b側)でネジ溝38aに螺合されている。その軸部52aの先端面52bは、貫通孔38の中間部分に位置している。軸部51aの先端面51bと軸部52aの先端面52bとの間には、少し隙間でできる程度が望ましい。軸部51aの貫通孔38への挿入量と軸部52aの貫通孔38への挿入量とは、略同じ量である。ネジ部材51の軸部51aの長さは、貫通孔38の全長の二分の一の長さより僅かに短い長さに貫通孔28aの全長を加算した長さとなっている。また、ネジ部材52の軸部52aの長さは、貫通孔38の全長の二分の一の長さより僅かに短い長さに貫通孔41の全長を加算した長さとなっている。このように軸部51a,52aの各長さを先端面51bと先端面52bとの間に少し隙間ができる程度の長さとしておくことにより、軸部51aと軸部52aの少なくとも一方の長さが誤差で長くなった場合でも対処できる。   The shaft portion 51a of the screw member 51 passes through the through hole 28a and is screwed into the screw groove 38a on one end side (the inner wall surface 37a side) of the through hole 38. The front end surface 51 b of the shaft portion 51 a is located at an intermediate portion of the through hole 38. On the other hand, the shaft portion 52 a of the screw member 52 passes through the through hole 41 and is screwed into the screw groove 38 a on the other end side (outer wall surface 37 b side) of the through hole 38. The front end surface 52 b of the shaft portion 52 a is located at the intermediate portion of the through hole 38. It is desirable that a small gap is formed between the tip surface 51b of the shaft portion 51a and the tip surface 52b of the shaft portion 52a. The insertion amount of the shaft portion 51a into the through hole 38 and the insertion amount of the shaft portion 52a into the through hole 38 are substantially the same amount. The length of the shaft portion 51 a of the screw member 51 is a length obtained by adding the total length of the through hole 28 a to a length slightly shorter than one half of the total length of the through hole 38. Further, the length of the shaft portion 52a of the screw member 52 is a length obtained by adding the entire length of the through hole 41 to a length slightly shorter than one half of the entire length of the through hole 38. Thus, by setting the lengths of the shaft portions 51a and 52a to such a length that a little gap is formed between the tip surface 51b and the tip surface 52b, the length of at least one of the shaft portion 51a and the shaft portion 52a is set. Even if it becomes longer due to errors, it can be dealt with.

軸部51aの貫通孔38への挿入量と軸部52aの貫通孔38への挿入量とは、上記のように略同じ挿入量とせずに、異なる挿入量としてもよい。例えば、側板37の内壁面37a側の重量(電池モジュール20などの重量)と外壁面37b側の重量(追加ウエイト部材40の重量)との重量比に応じて、各挿入量を設定してもよい。また、側板37における貫通孔38の位置(すなわち、ブラケット25と追加ウエイト部材40が固定される位置)に応じて、各挿入量を設定してもよい。例えば、電池モジュール20(ブラケット25)が側板37の上方側に少し片寄って配置される場合、軸部51aの挿入量を軸部52aの挿入量よりも多くする。また、一つのブラケット25で用いられる上下2本のネジ部材51で異なる挿入量としてもよく、例えば、上方のネジ部材51の挿入量を下方のネジ部材51の挿入量よりも多くする。また、電池モジュール20の2つのブラケット25毎に異なる挿入量としてもよく、例えば、上段の電池モジュール20の2つのブラケット25で用いられるネジ部材51の挿入量を下段の電池モジュール20の2つのブラケット25で用いられるネジ部材51の挿入量よりも多くする。また、ネジ部材51,52の軸部51a,52aの外径(貫通孔38の内径)についても、側板37の内壁面37a側の重量及び外壁面37b側の重量、側板37における貫通孔38の位置などに応じて適宜設定してもよい。   The insertion amount of the shaft portion 51a into the through hole 38 and the insertion amount of the shaft portion 52a into the through hole 38 may be different insertion amounts instead of the substantially same insertion amount as described above. For example, each insertion amount may be set according to the weight ratio of the weight of the side plate 37 on the inner wall surface 37a side (weight of the battery module 20, etc.) and the weight of the outer wall surface 37b side (weight of the additional weight member 40). Good. Further, each insertion amount may be set according to the position of the through hole 38 in the side plate 37 (that is, the position where the bracket 25 and the additional weight member 40 are fixed). For example, when the battery module 20 (bracket 25) is arranged slightly offset above the side plate 37, the insertion amount of the shaft portion 51a is made larger than the insertion amount of the shaft portion 52a. Further, different insertion amounts may be used for the upper and lower screw members 51 used in one bracket 25. For example, the insertion amount of the upper screw member 51 is made larger than the insertion amount of the lower screw member 51. The insertion amount may be different for each of the two brackets 25 of the battery module 20. For example, the insertion amount of the screw member 51 used in the two brackets 25 of the upper battery module 20 is set to the two brackets of the lower battery module 20. The insertion amount of the screw member 51 used in 25 is increased. Further, the outer diameters (inner diameters of the through holes 38) of the shaft portions 51 a and 52 a of the screw members 51 and 52 are also determined by the weight on the inner wall surface 37 a side and the outer wall surface 37 b side of the side plate 37. You may set suitably according to a position etc.

追加ウエイト部材40を固定するために、側板37に形成される全ての貫通孔38を用いてもよいしあるいは一部の貫通孔38だけを用いてもよい。一部の貫通孔38だけ用いる場合、追加ウエイト部材40の固定に用いられない貫通孔38については他端側(外壁面37b側)を封止しておくとよい。例えば、貫通孔38の他端側には、封止蓋を設けるとよい。封止蓋としては、例えば、六角孔付き止めネジといった軸部のみで構成されるネジ部材である。また、封止蓋を設けずに、ネジ部材51で封止してもよい。この場合、ネジ部材51の軸部51aの長さを貫通孔38の全長に貫通孔28aの全長を加算した長さとし、軸部51aの先端面51bが外壁面37bと面一になるようにするとよい。この場合、追加ウエイト部材40には、固定に用いられる箇所にのみ貫通孔41が形成される。   In order to fix the additional weight member 40, all the through holes 38 formed in the side plate 37 may be used, or only a part of the through holes 38 may be used. When only some of the through holes 38 are used, the other end side (the outer wall surface 37b side) of the through holes 38 that are not used for fixing the additional weight member 40 may be sealed. For example, a sealing lid may be provided on the other end side of the through hole 38. As a sealing lid, it is a screw member comprised only by axial parts, such as a hexagon socket set screw, for example. Moreover, you may seal with the screw member 51, without providing a sealing lid. In this case, the length of the shaft portion 51a of the screw member 51 is set to a length obtained by adding the entire length of the through hole 28a to the entire length of the through hole 38, and the tip end surface 51b of the shaft portion 51a is flush with the outer wall surface 37b. Good. In this case, the through-hole 41 is formed in the additional weight member 40 only in the place used for fixation.

側板37に形成される貫通孔38を用いた固定構造の場合、筐体30内の密閉性(水密性、気密性)を十分に確保しておく必要がある。そこで、シール部材60が、側板37の外壁面37bと追加ウエイト部材40の内壁面40aとの間に設けられる。シール部材60は、貫通孔38の周りにだけ配置されるシール部材である。シール部材60は、貫通孔38を囲む環状の薄い部材であり、例えば、Oリングである。シール部材60を形成する材料は、弾性変形可能な材料であり、例えば、ゴムである。   In the case of a fixing structure using the through-holes 38 formed in the side plate 37, it is necessary to sufficiently ensure the airtightness (watertightness, airtightness) in the housing 30. Therefore, the seal member 60 is provided between the outer wall surface 37 b of the side plate 37 and the inner wall surface 40 a of the additional weight member 40. The seal member 60 is a seal member disposed only around the through hole 38. The seal member 60 is an annular thin member surrounding the through hole 38, and is, for example, an O-ring. The material forming the seal member 60 is an elastically deformable material, for example, rubber.

シール部材60は、追加ウエイト部材40が側板37に沿うようにして配置される際に、側板37と追加ウエイト部材40との間に貫通孔38を囲むように配置される。そして、シール部材60を側板37と追加ウエイト部材40との間に挟んだ状態で、ネジ部材52が貫通孔38のネジ溝38aに螺合される。筐体30の内側からのネジ部材51による締め付けと筐体30の外側からのネジ部材52による締め付けにより、シール部材60は側板37と追加ウエイト部材40との間で弾性変形して薄くなる。なお、シール部材60を配置させる箇所には、側板37の外壁面37bと追加ウエイト部材40の内壁面40aの少なくとも一方にシール部材60の形状に沿った溝を設けてもよい。   The seal member 60 is disposed so as to surround the through hole 38 between the side plate 37 and the additional weight member 40 when the additional weight member 40 is disposed along the side plate 37. The screw member 52 is screwed into the screw groove 38 a of the through hole 38 with the seal member 60 sandwiched between the side plate 37 and the additional weight member 40. The seal member 60 is elastically deformed between the side plate 37 and the additional weight member 40 and thinned by the tightening by the screw member 51 from the inside of the housing 30 and the tightening by the screw member 52 from the outside of the housing 30. It should be noted that a groove along the shape of the seal member 60 may be provided on at least one of the outer wall surface 37 b of the side plate 37 and the inner wall surface 40 a of the additional weight member 40 at a location where the seal member 60 is disposed.

以上説明したように、電池パック10Aは、筐体30の側板37にネジ溝38a付きの貫通孔38が形成されている。従来の電池パックのように、筐体の壁部に非貫通のネジ孔(袋ネジ)が形成される構成では、筐体を製造する際に壁部を構成する部材の一つ一つにそれぞれ孔開け加工及びネジ切り加工を行う必要があった。さらに、同じ壁部に筐体内部材及び筐体外部材が固定される構成では、壁部の内側と外側とにそれぞれ孔開け加工及びネジ切り加工を行う必要があった。   As described above, in the battery pack 10 </ b> A, the through hole 38 with the screw groove 38 a is formed in the side plate 37 of the housing 30. In the configuration in which a non-penetrating screw hole (bag screw) is formed in the wall portion of the housing as in the conventional battery pack, each of the members constituting the wall portion is produced when the housing is manufactured. It was necessary to perform drilling and threading. Furthermore, in the configuration in which the housing inner member and the housing outer member are fixed to the same wall portion, it is necessary to perform drilling and threading on the inside and outside of the wall portion, respectively.

これに対し、電池パック10Aでは、ネジ溝38a付きの貫通孔38を筐体30の内側のブラケット25及び筐体30の外側の追加ウエイト部材40を側板37に固定するための共通孔として利用することにより、側板37の内側と外側にネジ孔を別々に形成する必要がない。そのため、電池パック10Aは、筐体30の側板37に形成する孔の個数を低減できる。また、電池パック10Aでは、側板37を構成する部材を複数重ねて孔開け加工及びネジ切り加工を行うことにより、一度に複数の側板37にネジ溝38a付きの貫通孔38を形成できる。したがって、従来の電池パックのように、筐体の壁部の内側と外側とに非貫通のネジ孔を形成する場合と比べて、電池パック10Aの製造工程を簡単化でき、製造コストを低減できる。   On the other hand, in the battery pack 10 </ b> A, the through hole 38 with the screw groove 38 a is used as a common hole for fixing the bracket 25 inside the housing 30 and the additional weight member 40 outside the housing 30 to the side plate 37. Therefore, it is not necessary to separately form screw holes on the inner side and the outer side of the side plate 37. Therefore, the battery pack 10 </ b> A can reduce the number of holes formed in the side plate 37 of the housing 30. Further, in the battery pack 10 </ b> A, through holes 38 with thread grooves 38 a can be formed in a plurality of side plates 37 at a time by stacking a plurality of members constituting the side plate 37 and performing drilling and threading. Therefore, the manufacturing process of the battery pack 10A can be simplified and the manufacturing cost can be reduced as compared with the case of forming non-penetrating screw holes on the inside and outside of the wall portion of the housing as in the conventional battery pack. .

また、電池パック10Aでは、貫通孔38の内壁にはネジ溝38aが形成されているので、ネジ部材51,52による締め付けによりブラケット25及び追加ウエイト部材40を側板37に強固に固定できる。また、電池パック10Aでは、側板37に貫通孔38を形成しているが、貫通孔38のネジ溝38aとネジ部材51,52とが螺合されているので、筐体30の密閉性(水密性、気密性)を向上できる。さらに、電池パック10Aでは、側板37と追加ウエイト部材40との間における貫通孔38の周りにシール部材60が設けられているので、筐体30の密閉性を更に向上できる。このシール部材60は、貫通孔38の周りにだけ配置させる環状の部材なので、コストを低減できる。   Further, in the battery pack 10 </ b> A, since the screw groove 38 a is formed on the inner wall of the through hole 38, the bracket 25 and the additional weight member 40 can be firmly fixed to the side plate 37 by tightening with the screw members 51 and 52. Further, in the battery pack 10A, the through hole 38 is formed in the side plate 37, but the screw groove 38a of the through hole 38 and the screw members 51 and 52 are screwed together. Property and airtightness). Furthermore, in the battery pack 10 </ b> A, since the seal member 60 is provided around the through hole 38 between the side plate 37 and the additional weight member 40, the sealing performance of the housing 30 can be further improved. Since the seal member 60 is an annular member disposed only around the through hole 38, the cost can be reduced.

また、電池パック10Aでは、側板37の内壁面37aに電池モジュール20が設けられ、同じ側板37の外壁面37bに追加ウエイト部材40が設けられる構成としているので、追加ウエイト部材40を熱マスとして機能させることができる。そのため、電池パック10Aでは、電池モジュール20(電池セル21)で発生した熱の放熱性を向上できる。特に、電池パック10Aでは、貫通孔38(共通孔)を用いて電池モジュール20及び追加ウエイト部材40が同じ箇所で固定されるので、電池モジュール20が配置される箇所で追加ウエイト部材40と側板37との密着性が高くなり、放熱性を更に向上できる。   Further, in the battery pack 10A, since the battery module 20 is provided on the inner wall surface 37a of the side plate 37 and the additional weight member 40 is provided on the outer wall surface 37b of the same side plate 37, the additional weight member 40 functions as a thermal mass. Can be made. Therefore, in battery pack 10A, the heat dissipation of the heat generated in battery module 20 (battery cell 21) can be improved. In particular, in the battery pack 10A, since the battery module 20 and the additional weight member 40 are fixed at the same place using the through hole 38 (common hole), the additional weight member 40 and the side plate 37 are placed at the place where the battery module 20 is disposed. Adhesiveness to the surface becomes high, and heat dissipation can be further improved.

また、電池パック10Aでは、筐体30の外側に追加ウエイト部材40が設けられる構成としているので、カウンタウエイト用のウエイト部材を取り付け際の作業性を向上できる。また、電池パック10Aでは、追加ウエイト部材40が平板状なので、追加ウエイト部材40の取扱いが容易であり、カウンタウエイト用のウエイト部材のコストを低減できる。   Further, since the battery pack 10A is configured such that the additional weight member 40 is provided outside the housing 30, workability when attaching the weight member for the counterweight can be improved. Further, in the battery pack 10A, since the additional weight member 40 is flat, handling of the additional weight member 40 is easy, and the cost of the weight member for the counterweight can be reduced.

また、電池パック10Aでは、ネジ部材51とネジ部材52を用いて貫通孔38の内側と外側の両側から固定するので、ブラケット25と追加ウエイト部材40とを別々に取り付け/取り外しが可能である。例えば、電池パック10Aの電池モジュール20を交換する場合、追加ウエイト部材40を取り外すことなく、電池モジュール20の取り付け/取り外し作業を行うことができる。   Further, in the battery pack 10A, since the screw member 51 and the screw member 52 are used to fix the through hole 38 from both the inside and the outside, the bracket 25 and the additional weight member 40 can be attached / removed separately. For example, when the battery module 20 of the battery pack 10 </ b> A is replaced, the battery module 20 can be attached / detached without removing the additional weight member 40.

図5及び図6を参照して、第2実施形態に係る電池パック10Bについて説明する。図5は、電池パック10Bの外観を示す概略斜視図である。図6は、電池パック10Bにおけるブラケット25及び追加ウエイト部材40と筐体30の壁部との固定構造を示す要部拡大断面図である。電池パック10Bは、第1実施形態に係る電池パック10Aと比較すると、シール部材の構成が異なる。電池パック10Bでは、シール部材61が筐体30の壁部と追加ウエイト部材40との間に設けられている。   With reference to FIG.5 and FIG.6, the battery pack 10B which concerns on 2nd Embodiment is demonstrated. FIG. 5 is a schematic perspective view showing the external appearance of the battery pack 10B. FIG. 6 is an enlarged cross-sectional view of a main part showing a fixing structure of the bracket 25 and the additional weight member 40 and the wall portion of the housing 30 in the battery pack 10B. The battery pack 10B is different from the battery pack 10A according to the first embodiment in the configuration of the seal member. In the battery pack 10 </ b> B, the seal member 61 is provided between the wall portion of the housing 30 and the additional weight member 40.

シール部材61は、追加ウエイト部材40の全面に配置されるシール部材である。シール部材61は、追加ウエイト部材40の形状と略同じ矩形状の薄い部材である。シール部材61を形成する材料は、熱伝導性を有しかつ弾性変形可能な材料であり、例えば、シリコン系材料である。シール部材61には、貫通孔62が形成されている。貫通孔62は、シール部材61の内壁面61aから外壁面61bに至るようにシール部材61の厚さ方向に貫通して形成されている。貫通孔62は、側板37のネジ溝38a付きの貫通孔38の内径と略同径又は僅かに大きい内径を有する。シール部材61に形成される貫通孔62の個数は、追加ウエイト部材40に形成される貫通孔41の個数と同じ個数である。シール部材61に形成される各貫通孔62の位置は、追加ウエイト部材40に形成される貫通孔41の位置にそれぞれ対応した位置である。なお、シール部材61を形成する材料は、熱伝導性を有する接着剤でもよい。   The seal member 61 is a seal member disposed on the entire surface of the additional weight member 40. The sealing member 61 is a rectangular thin member that is substantially the same as the shape of the additional weight member 40. The material forming the seal member 61 is a material having thermal conductivity and elastic deformation, and is, for example, a silicon-based material. A through hole 62 is formed in the seal member 61. The through hole 62 is formed so as to penetrate in the thickness direction of the seal member 61 so as to reach from the inner wall surface 61 a of the seal member 61 to the outer wall surface 61 b. The through hole 62 has an inner diameter substantially the same as or slightly larger than the inner diameter of the through hole 38 with the screw groove 38 a of the side plate 37. The number of through holes 62 formed in the seal member 61 is the same as the number of through holes 41 formed in the additional weight member 40. The positions of the through holes 62 formed in the seal member 61 are positions corresponding to the positions of the through holes 41 formed in the additional weight member 40, respectively. The material forming the seal member 61 may be a heat conductive adhesive.

シール部材61は、貫通孔62と側板37の貫通孔38とを位置合わせした状態で、内壁面61aが側板37の外壁面37bに沿うようにして配置されている。さらに、追加ウエイト部材40は、貫通孔41とシール部材61の貫通孔62とを位置合わせした状態で、内壁面40aがシール部材61の外壁面61bに沿うようにして配置されている。そして、追加ウエイト部材40に形成されている貫通孔41毎に、ネジ部材53(第2のネジ部材(固定部材))が、貫通孔41と貫通孔62に通され、貫通孔38のネジ溝38aに螺合されている。これにより、追加ウエイト部材40が、シール部材61を挟んだ状態で側板37に強固に固定される。軸部51aの先端面51bと軸部53aの先端面53bとの間には、少し隙間でできる程度が望ましい。   The seal member 61 is disposed such that the inner wall surface 61 a is along the outer wall surface 37 b of the side plate 37 in a state where the through hole 62 and the through hole 38 of the side plate 37 are aligned. Further, the additional weight member 40 is disposed such that the inner wall surface 40 a is along the outer wall surface 61 b of the seal member 61 in a state where the through hole 41 and the through hole 62 of the seal member 61 are aligned. Then, for each through hole 41 formed in the additional weight member 40, the screw member 53 (second screw member (fixing member)) is passed through the through hole 41 and the through hole 62, and the screw groove of the through hole 38. 38a is screwed. Thereby, the additional weight member 40 is firmly fixed to the side plate 37 with the seal member 61 interposed therebetween. It is desirable that a slight gap be formed between the tip surface 51b of the shaft portion 51a and the tip surface 53b of the shaft portion 53a.

ネジ部材53の軸部53aの長さは、第1実施形態のネジ部材52の軸部52aの長さと略同じ長さかあるいは僅かに長い長さである。シール部材61は、薄い部材であり、側板37と追加ウエイト部材40との間に挟み込まれると弾性変形して更に薄くなる。この薄くなった場合のシール部材61の厚みを考慮して、軸部53aの長さを適宜設定するとよい。   The length of the shaft portion 53a of the screw member 53 is substantially the same as or slightly longer than the length of the shaft portion 52a of the screw member 52 of the first embodiment. The seal member 61 is a thin member, and when sandwiched between the side plate 37 and the additional weight member 40, the seal member 61 is elastically deformed and further thinned. In consideration of the thickness of the seal member 61 when the thickness is reduced, the length of the shaft portion 53a may be set as appropriate.

電池パック10Bは、第1実施形態に係る電池パック10Aと同様の効果(但し、シール部材60に関する効果は除く)を奏する上に、以下の効果も奏する。電池パック10Bでは、側板37と追加ウエイト部材40との間の全面にシール部材61が設けられることにより、筐体30の密閉性を向上できる。また、電池パック10Bでは、シール部材61が熱伝導性を有するので、電池モジュール20から側板37に伝わった熱をシール部材61により追加ウエイト部材40に効率良く伝えることができる。そのため、電池パック10Bでは、電池モジュール20(電池セル21)で発生した熱の放熱性を更に向上できる。   The battery pack 10B has the same effects as the battery pack 10A according to the first embodiment (however, the effects related to the seal member 60 are excluded), and also has the following effects. In the battery pack 10 </ b> B, the sealing member 61 is provided on the entire surface between the side plate 37 and the additional weight member 40, whereby the sealing performance of the housing 30 can be improved. In the battery pack 10B, since the sealing member 61 has thermal conductivity, the heat transferred from the battery module 20 to the side plate 37 can be efficiently transmitted to the additional weight member 40 by the sealing member 61. Therefore, in the battery pack 10B, the heat dissipation of the heat generated in the battery module 20 (battery cell 21) can be further improved.

なお、側板37及び追加ウエイト部材40は、金属材料などで形成されるので、表面には細かな凹凸がある。そのため、側板37と追加ウエイト部材40とが接するように配置されると、その細かな凹凸により側板37と追加ウエイト部材40との間に小さい空気層ができる場合がある。このような空気層があると、熱は伝わり難くなる。電池パック10Bでは、側板37と追加ウエイト部材40との間に設けられるシール部材61が弾性変形可能なので、シール部材61が側板37の表面及び追加ウエイト部材40の表面の細かな凹凸に沿って変形し、空気層ができるのを抑制できる。そのため、電池パック10Bでは、シール部材61を介して側板37から追加ウエイト部材40に熱を効率良く伝えることができる。   In addition, since the side plate 37 and the additional weight member 40 are formed of a metal material or the like, there are fine irregularities on the surface. Therefore, when the side plate 37 and the additional weight member 40 are arranged so as to contact each other, a small air layer may be formed between the side plate 37 and the additional weight member 40 due to the fine unevenness. When there is such an air layer, heat is difficult to transfer. In the battery pack 10B, since the seal member 61 provided between the side plate 37 and the additional weight member 40 can be elastically deformed, the seal member 61 is deformed along fine irregularities on the surface of the side plate 37 and the surface of the additional weight member 40. In addition, the formation of an air layer can be suppressed. Therefore, in the battery pack 10 </ b> B, heat can be efficiently transmitted from the side plate 37 to the additional weight member 40 via the seal member 61.

以上、本発明の実施形態について説明したが、上記実施形態に限定されることなく様々な形態で実施される。   As mentioned above, although embodiment of this invention was described, it is implemented in various forms, without being limited to the said embodiment.

例えば、上記実施形態では側板の貫通孔の内壁にネジ溝が形成される構成としたが、貫通孔にネジ溝が形成されない構成としてもよい。図7を参照して、ネジ溝が無い貫通孔の固定構造の一例を説明する。側板37には、貫通孔39が形成されている。この貫通孔39には、ネジ溝が形成されていない。追加ウエイト部材40は、貫通孔41と貫通孔39とを位置合わせした状態で、内壁面40aが側板37の外壁面37bに沿うようにして配置されている。そして、追加ウエイト部材40に形成されている貫通孔41毎に、ネジ部材54(固定部材)が、貫通孔41に通され、さらに貫通孔39及び貫通孔28aに通される。このネジ部材54の軸部54aの長さは、貫通孔41の全長と貫通孔39の全長と貫通孔28aの全長とを積算した長さよりも所定量長い長さである。したがって、ネジ部材54の軸部54aの先端部が、貫通孔28aを通過して筐体30の内部にまで出ている。そして、ナット55が、その軸部54aの先端部に螺合されている。これにより、追加ウエイト部材40が、側板37の外壁面37bに強固に固定されている。この構成の場合、貫通孔39へのネジ切り加工を省略できるので、電池パックの製造工程を更に簡単化できる。   For example, in the above embodiment, the thread groove is formed on the inner wall of the through hole of the side plate, but the thread groove may not be formed in the through hole. With reference to FIG. 7, an example of the fixing structure of the through-hole without a thread groove will be described. A through hole 39 is formed in the side plate 37. The through hole 39 is not formed with a thread groove. The additional weight member 40 is disposed such that the inner wall surface 40 a is along the outer wall surface 37 b of the side plate 37 in a state where the through hole 41 and the through hole 39 are aligned. For each through hole 41 formed in the additional weight member 40, the screw member 54 (fixing member) is passed through the through hole 41, and further passed through the through hole 39 and the through hole 28a. The length of the shaft portion 54a of the screw member 54 is longer by a predetermined amount than the total length of the through hole 41, the entire length of the through hole 39, and the entire length of the through hole 28a. Therefore, the tip end portion of the shaft portion 54 a of the screw member 54 passes through the through hole 28 a and protrudes to the inside of the housing 30. A nut 55 is screwed to the tip end of the shaft portion 54a. Thereby, the additional weight member 40 is firmly fixed to the outer wall surface 37 b of the side plate 37. In the case of this configuration, since the threading process to the through hole 39 can be omitted, the battery pack manufacturing process can be further simplified.

また、上記実施形態では電池モジュールを筐体の壁部に固定するためのブラケットを筐体内部材をとしたが、筐体内部材としては電池モジュールの配線用の部材(例えば、バスバー)を壁部に取り付けに用いる端子台などの他の部材でもよい。また、上記実施形態では追加ウエイト部材を筐体外部材としたが、筐体外部材としては電池パックを外部の装置と接続するためのコネクタ、CAN[Controller Area Network]通信を行う通信機器のカバーなどの他の部材でもよい。これらの他の筐体内部材、筐体外部材を筐体の壁部に固定する場合でも共通の貫通孔を用いて固定することにより、電池パックの製造工程を簡単化できる。   Moreover, in the said embodiment, although the bracket for fixing a battery module to the wall part of a housing | casing was used as the member in a housing | casing, as a member in a housing | casing, the member (for example, bus bar) for battery module wiring is used as a wall part. Other members such as a terminal block used for attachment may be used. In the above-described embodiment, the additional weight member is an outer case member. However, the outer case member includes a connector for connecting the battery pack to an external device, a cover of a communication device that performs CAN [Controller Area Network] communication, and the like. Other members may be used. Even when these other members inside the case and members outside the case are fixed to the wall of the case, the manufacturing process of the battery pack can be simplified by fixing using the common through-hole.

また、上記実施形態ではシール部材を筐体の壁部と筐体外部材との間に設ける構成としたが、筐体の密閉性を確保できるのであればシール部材を設けない構成としてもよい。例えば、貫通孔のネジ溝とネジ部材との螺合により貫通孔の封止を十分にできれば、シール部材を設けなくてもよい。この場合、シール部材を設けないので、電池パックの部品点数を削減でき、シール部材の組み付け工程を省略できる。   Moreover, in the said embodiment, although it was set as the structure which provides a sealing member between the wall part of a housing | casing, and a housing outer member, as long as the sealing property of a housing | casing can be ensured, it is good also as a structure which does not provide a sealing member. For example, if the through hole can be sufficiently sealed by screwing the thread groove of the through hole and the screw member, the seal member need not be provided. In this case, since no sealing member is provided, the number of parts of the battery pack can be reduced, and the assembly process of the sealing member can be omitted.

また、上記実施形態では筐体の壁部の全面に配置される追加ウエイト部材としたが、壁部の一部分に配置される追加ウエイト部材としてもよい。壁部の一部分にだけ配置される追加ウエイト部材の場合、壁部において追加ウエイト部材が配置されない部分についてはブラケット(筐体内部材)を固定するための孔を貫通孔としてもよいしあるいは非貫通のネジ孔としてもよい。貫通孔とする場合、筐体の密閉性を向上させるために、貫通孔の他端側(壁部の外壁面側)には封止用のネジ部材などを設けるとよい。   In the above embodiment, the additional weight member is disposed on the entire surface of the wall portion of the housing. However, the additional weight member may be disposed on a part of the wall portion. In the case of an additional weight member arranged only in a part of the wall portion, a hole for fixing the bracket (inner housing member) may be used as a through hole or a non-penetrating portion in the portion of the wall portion where the additional weight member is not arranged. It is good also as a screw hole. When the through hole is used, a sealing screw member or the like may be provided on the other end side (outer wall surface side of the wall portion) of the through hole in order to improve the sealing performance of the housing.

また、上記実施形態ではエンドプレートとブラケットとを別体とし、一対のエンドプレートによって複数の電池セルが拘束され、各ブラケットがエンドプレートにネジ部材で固定されるとともに筐体の壁部にネジ部材で固定される構成としたが、エンドプレートとブラケットとを一体化したブラケット部材(例えば、金属材料からなる板状部材が折り曲げられて形成され、折曲部を挟んで挟持部(複数の電池セルを挟み込む部分)と固定部(筐体の壁部に固定される部分)とからなる部材)とし、一対のブラケット部材によって複数の電池セルが拘束され、各ブラケット部材が筐体の壁部にネジ部材で固定される構成としてもよい。さらに、このブラケット部材あるいは単体のエンドプレートと電池セルとの間に絶縁用などのプレートが設けられてもよい。   In the above embodiment, the end plate and the bracket are separated from each other, a plurality of battery cells are restrained by a pair of end plates, each bracket is fixed to the end plate with a screw member, and the screw member is attached to the wall portion of the housing. The bracket member (for example, a plate-like member made of a metal material is bent and formed, and sandwiched between the bent portions (a plurality of battery cells). A plurality of battery cells are restrained by a pair of bracket members, and each bracket member is screwed to the wall portion of the housing. It is good also as a structure fixed with a member. Furthermore, a plate for insulation may be provided between the bracket member or a single end plate and the battery cell.

1…フォークリフト、2…車体、3…荷役装置、4…運転室、10,10A,10B…電池パック、20…電池モジュール、21…電池セル、22…電池ホルダ、23…バスバー、24…エンドプレート、24a…外側面、25…ブラケット、26…ネジ孔、27…第1の平板部、27a…貫通穴、28…第2の平板部、28a…貫通孔、30…筐体、31…本体、32…天板、33…蓋部材、34…底板、35,36,37…側板、37a…内壁面、37b…外壁面、38,39…貫通孔、38a…ネジ溝、40…追加ウエイト部材、40a…内壁面、40b…外壁面、41…貫通孔、50,51,52,53,54…ネジ部材、51a,52a,53a,54a…軸部、51b,52b,53b…先端面、55…ナット、60,61…シール部材、61a…内壁面、61b…外壁面、62…貫通孔。   DESCRIPTION OF SYMBOLS 1 ... Forklift, 2 ... Vehicle body, 3 ... Cargo handling device, 4 ... Driver's cab 10, 10A, 10B ... Battery pack, 20 ... Battery module, 21 ... Battery cell, 22 ... Battery holder, 23 ... Bus bar, 24 ... End plate 24a ... outer surface, 25 ... bracket, 26 ... screw hole, 27 ... first flat plate portion, 27a ... through hole, 28 ... second flat plate portion, 28a ... through hole, 30 ... housing, 31 ... main body, 32 ... Top plate, 33 ... Lid member, 34 ... Bottom plate, 35, 36, 37 ... Side plate, 37a ... Inner wall surface, 37b ... Outer wall surface, 38, 39 ... Through-hole, 38a ... Screw groove, 40 ... Additional weight member, 40a ... inner wall surface, 40b ... outer wall surface, 41 ... through hole, 50, 51, 52, 53, 54 ... screw member, 51a, 52a, 53a, 54a ... shaft portion, 51b, 52b, 53b ... tip surface, 55 ... Nut, 60, 61 ... Le member, 61a ... inner wall, 61b ... outer wall surface, 62 ... through hole.

Claims (7)

筐体内に電池モジュールを収納してなる電池パックであって、
前記筐体の壁部を貫通するように貫通孔が形成され、
前記貫通孔に対して設けられた固定部材によって、前記筐体の内側に配置された筐体内部材と前記筐体の外側に配置された筐体外部材とが前記壁部に固定される、電池パック。
A battery pack containing a battery module in a housing,
A through hole is formed so as to penetrate the wall portion of the housing,
A battery pack in which a housing inner member disposed inside the housing and a housing outer member disposed outside the housing are fixed to the wall portion by a fixing member provided for the through hole. .
前記筐体内部材は、前記電池モジュールを前記壁部に固定するための部材である、請求項1に記載の電池パック。   The battery pack according to claim 1, wherein the casing inner member is a member for fixing the battery module to the wall portion. 前記電池パックは、産業車両に搭載され、
前記筐体外部材は、ウエイト部材である、請求項1又は請求項2に記載の電池パック。
The battery pack is mounted on an industrial vehicle,
The battery pack according to claim 1, wherein the casing outer member is a weight member.
前記壁部と前記筐体外部材との間にシール部材が設けられる、請求項1〜請求項3のいずれか一項に記載の電池パック。   The battery pack according to any one of claims 1 to 3, wherein a seal member is provided between the wall portion and the housing outer member. 前記シール部材は、熱伝導性を有する、請求項4に記載の電池パック。   The battery pack according to claim 4, wherein the seal member has thermal conductivity. 前記貫通孔の内壁にネジ溝が形成される、請求項1〜請求項5のいずれか一項に記載の電池パック。   The battery pack according to any one of claims 1 to 5, wherein a thread groove is formed on an inner wall of the through hole. 前記固定部材は、第1のネジ部材と第2のネジ部材であり、
前記筐体の内側から前記貫通孔の一端側に螺合された前記第1のネジ部材によって、前記筐体内部材が前記壁部に固定され、
前記筐体の外側から前記貫通孔の他端側に螺合された前記第2のネジ部材によって、前記筐体外部材が前記筐体の壁部に固定される、請求項6に記載の電池パック。
The fixing member is a first screw member and a second screw member,
The inner member of the housing is fixed to the wall portion by the first screw member screwed into the one end side of the through hole from the inside of the housing,
The battery pack according to claim 6, wherein the outer member of the casing is fixed to the wall portion of the casing by the second screw member screwed into the other end side of the through hole from the outside of the casing. .
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